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llmeval-env/lib/python3.10/site-packages/_multiprocess/__init__.py

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+#!/usr/bin/env python
+#
+# Author: Mike McKerns (mmckerns @caltech and @uqfoundation)
+# Copyright (c) 2022-2024 The Uncertainty Quantification Foundation.
+# License: 3-clause BSD.  The full license text is available at:
+#  - https://github.com/uqfoundation/multiprocess/blob/master/LICENSE
+
+from _multiprocessing import *

llmeval-env/lib/python3.10/site-packages/lxml/_elementpath.py

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+# cython: language_level=2
+
+#
+# ElementTree
+# $Id: ElementPath.py 3375 2008-02-13 08:05:08Z fredrik $
+#
+# limited xpath support for element trees
+#
+# history:
+# 2003-05-23 fl   created
+# 2003-05-28 fl   added support for // etc
+# 2003-08-27 fl   fixed parsing of periods in element names
+# 2007-09-10 fl   new selection engine
+# 2007-09-12 fl   fixed parent selector
+# 2007-09-13 fl   added iterfind; changed findall to return a list
+# 2007-11-30 fl   added namespaces support
+# 2009-10-30 fl   added child element value filter
+#
+# Copyright (c) 2003-2009 by Fredrik Lundh.  All rights reserved.
+#
+# [email protected]
+# http://www.pythonware.com
+#
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2009 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+##
+# Implementation module for XPath support.  There's usually no reason
+# to import this module directly; the <b>ElementTree</b> does this for
+# you, if needed.
+##
+
+
+import re
+
+xpath_tokenizer_re = re.compile(
+    "("
+    "'[^']*'|\"[^\"]*\"|"
+    "::|"
+    "//?|"
+    r"\.\.|"
+    r"\(\)|"
+    r"[/.*:\[\]\(\)@=])|"
+    r"((?:\{[^}]+\})?[^/\[\]\(\)@=\s]+)|"
+    r"\s+"
+    )
+
+def xpath_tokenizer(pattern, namespaces=None, with_prefixes=True):
+    # ElementTree uses '', lxml used None originally.
+    default_namespace = (namespaces.get(None) or namespaces.get('')) if namespaces else None
+    parsing_attribute = False
+    for token in xpath_tokenizer_re.findall(pattern):
+        ttype, tag = token
+        if tag and tag[0] != "{":
+            if ":" in tag and with_prefixes:
+                prefix, uri = tag.split(":", 1)
+                try:
+                    if not namespaces:
+                        raise KeyError
+                    yield ttype, "{%s}%s" % (namespaces[prefix], uri)
+                except KeyError:
+                    raise SyntaxError("prefix %r not found in prefix map" % prefix)
+            elif default_namespace and not parsing_attribute:
+                yield ttype, "{%s}%s" % (default_namespace, tag)
+            else:
+                yield token
+            parsing_attribute = False
+        else:
+            yield token
+            parsing_attribute = ttype == '@'
+
+
+def prepare_child(next, token):
+    tag = token[1]
+    def select(result):
+        for elem in result:
+            yield from elem.iterchildren(tag)
+    return select
+
+def prepare_star(next, token):
+    def select(result):
+        for elem in result:
+            yield from elem.iterchildren('*')
+    return select
+
+def prepare_self(next, token):
+    def select(result):
+        return result
+    return select
+
+def prepare_descendant(next, token):
+    token = next()
+    if token[0] == "*":
+        tag = "*"
+    elif not token[0]:
+        tag = token[1]
+    else:
+        raise SyntaxError("invalid descendant")
+    def select(result):
+        for elem in result:
+            yield from elem.iterdescendants(tag)
+    return select
+
+def prepare_parent(next, token):
+    def select(result):
+        for elem in result:
+            parent = elem.getparent()
+            if parent is not None:
+                yield parent
+    return select
+
+def prepare_predicate(next, token):
+    # FIXME: replace with real parser!!! refs:
+    # http://effbot.org/zone/simple-iterator-parser.htm
+    # http://javascript.crockford.com/tdop/tdop.html
+    signature = ''
+    predicate = []
+    while 1:
+        token = next()
+        if token[0] == "]":
+            break
+        if token == ('', ''):
+            # ignore whitespace
+            continue
+        if token[0] and token[0][:1] in "'\"":
+            token = "'", token[0][1:-1]
+        signature += token[0] or "-"
+        predicate.append(token[1])
+
+    # use signature to determine predicate type
+    if signature == "@-":
+        # [@attribute] predicate
+        key = predicate[1]
+        def select(result):
+            for elem in result:
+                if elem.get(key) is not None:
+                    yield elem
+        return select
+    if signature == "@-='":
+        # [@attribute='value']
+        key = predicate[1]
+        value = predicate[-1]
+        def select(result):
+            for elem in result:
+                if elem.get(key) == value:
+                    yield elem
+        return select
+    if signature == "-" and not re.match(r"-?\d+$", predicate[0]):
+        # [tag]
+        tag = predicate[0]
+        def select(result):
+            for elem in result:
+                for _ in elem.iterchildren(tag):
+                    yield elem
+                    break
+        return select
+    if signature == ".='" or (signature == "-='" and not re.match(r"-?\d+$", predicate[0])):
+        # [.='value'] or [tag='value']
+        tag = predicate[0]
+        value = predicate[-1]
+        if tag:
+            def select(result):
+                for elem in result:
+                    for e in elem.iterchildren(tag):
+                        if "".join(e.itertext()) == value:
+                            yield elem
+                            break
+        else:
+            def select(result):
+                for elem in result:
+                    if "".join(elem.itertext()) == value:
+                        yield elem
+        return select
+    if signature == "-" or signature == "-()" or signature == "-()-":
+        # [index] or [last()] or [last()-index]
+        if signature == "-":
+            # [index]
+            index = int(predicate[0]) - 1
+            if index < 0:
+                if index == -1:
+                    raise SyntaxError(
+                        "indices in path predicates are 1-based, not 0-based")
+                else:
+                    raise SyntaxError("path index >= 1 expected")
+        else:
+            if predicate[0] != "last":
+                raise SyntaxError("unsupported function")
+            if signature == "-()-":
+                try:
+                    index = int(predicate[2]) - 1
+                except ValueError:
+                    raise SyntaxError("unsupported expression")
+            else:
+                index = -1
+        def select(result):
+            for elem in result:
+                parent = elem.getparent()
+                if parent is None:
+                    continue
+                try:
+                    # FIXME: what if the selector is "*" ?
+                    elems = list(parent.iterchildren(elem.tag))
+                    if elems[index] is elem:
+                        yield elem
+                except IndexError:
+                    pass
+        return select
+    raise SyntaxError("invalid predicate")
+
+ops = {
+    "": prepare_child,
+    "*": prepare_star,
+    ".": prepare_self,
+    "..": prepare_parent,
+    "//": prepare_descendant,
+    "[": prepare_predicate,
+}
+
+
+# --------------------------------------------------------------------
+
+_cache = {}
+
+
+def _build_path_iterator(path, namespaces, with_prefixes=True):
+    """compile selector pattern"""
+    if path[-1:] == "/":
+        path += "*"  # implicit all (FIXME: keep this?)
+
+    cache_key = (path,)
+    if namespaces:
+        # lxml originally used None for the default namespace but ElementTree uses the
+        # more convenient (all-strings-dict) empty string, so we support both here,
+        # preferring the more convenient '', as long as they aren't ambiguous.
+        if None in namespaces:
+            if '' in namespaces and namespaces[None] != namespaces['']:
+                raise ValueError("Ambiguous default namespace provided: %r versus %r" % (
+                    namespaces[None], namespaces['']))
+            cache_key += (namespaces[None],) + tuple(sorted(
+                item for item in namespaces.items() if item[0] is not None))
+        else:
+            cache_key += tuple(sorted(namespaces.items()))
+
+    try:
+        return _cache[cache_key]
+    except KeyError:
+        pass
+    if len(_cache) > 100:
+        _cache.clear()
+
+    if path[:1] == "/":
+        raise SyntaxError("cannot use absolute path on element")
+    stream = iter(xpath_tokenizer(path, namespaces, with_prefixes=with_prefixes))
+    try:
+        _next = stream.next
+    except AttributeError:
+        # Python 3
+        _next = stream.__next__
+    try:
+        token = _next()
+    except StopIteration:
+        raise SyntaxError("empty path expression")
+    selector = []
+    while 1:
+        try:
+            selector.append(ops[token[0]](_next, token))
+        except StopIteration:
+            raise SyntaxError("invalid path")
+        try:
+            token = _next()
+            if token[0] == "/":
+                token = _next()
+        except StopIteration:
+            break
+    _cache[cache_key] = selector
+    return selector
+
+
+##
+# Iterate over the matching nodes
+
+def iterfind(elem, path, namespaces=None, with_prefixes=True):
+    selector = _build_path_iterator(path, namespaces, with_prefixes=with_prefixes)
+    result = iter((elem,))
+    for select in selector:
+        result = select(result)
+    return result
+
+
+##
+# Find first matching object.
+
+def find(elem, path, namespaces=None, with_prefixes=True):
+    it = iterfind(elem, path, namespaces, with_prefixes=with_prefixes)
+    try:
+        return next(it)
+    except StopIteration:
+        return None
+
+
+##
+# Find all matching objects.
+
+def findall(elem, path, namespaces=None, with_prefixes=True):
+    return list(iterfind(elem, path, namespaces))
+
+
+##
+# Find text for first matching object.
+
+def findtext(elem, path, default=None, namespaces=None, with_prefixes=True):
+    el = find(elem, path, namespaces, with_prefixes=with_prefixes)
+    if el is None:
+        return default
+    else:
+        return el.text or ''

llmeval-env/lib/python3.10/site-packages/lxml/apihelpers.pxi

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+# Private/public helper functions for API functions
+
+from lxml.includes cimport uri
+
+
+cdef void displayNode(xmlNode* c_node, indent) noexcept:
+    # to help with debugging
+    cdef xmlNode* c_child
+    try:
+        print(indent * ' ', <long>c_node)
+        c_child = c_node.children
+        while c_child is not NULL:
+            displayNode(c_child, indent + 1)
+            c_child = c_child.next
+    finally:
+        return  # swallow any exceptions
+
+cdef inline bint _isHtmlDocument(_Element element) except -1:
+    cdef xmlNode* c_node = element._c_node
+    return (
+        c_node is not NULL and c_node.doc is not NULL and
+        c_node.doc.properties & tree.XML_DOC_HTML != 0
+    )
+
+cdef inline int _assertValidNode(_Element element) except -1:
+    assert element._c_node is not NULL, "invalid Element proxy at %s" % id(element)
+
+cdef inline int _assertValidDoc(_Document doc) except -1:
+    assert doc._c_doc is not NULL, "invalid Document proxy at %s" % id(doc)
+
+cdef _Document _documentOrRaise(object input):
+    """Call this to get the document of a _Document, _ElementTree or _Element
+    object, or to raise an exception if it can't be determined.
+
+    Should be used in all API functions for consistency.
+    """
+    cdef _Document doc
+    if isinstance(input, _ElementTree):
+        if (<_ElementTree>input)._context_node is not None:
+            doc = (<_ElementTree>input)._context_node._doc
+        else:
+            doc = None
+    elif isinstance(input, _Element):
+        doc = (<_Element>input)._doc
+    elif isinstance(input, _Document):
+        doc = <_Document>input
+    else:
+        raise TypeError, f"Invalid input object: {python._fqtypename(input).decode('utf8')}"
+    if doc is None:
+        raise ValueError, f"Input object has no document: {python._fqtypename(input).decode('utf8')}"
+    _assertValidDoc(doc)
+    return doc
+
+cdef _Element _rootNodeOrRaise(object input):
+    """Call this to get the root node of a _Document, _ElementTree or
+     _Element object, or to raise an exception if it can't be determined.
+
+    Should be used in all API functions for consistency.
+     """
+    cdef _Element node
+    if isinstance(input, _ElementTree):
+        node = (<_ElementTree>input)._context_node
+    elif isinstance(input, _Element):
+        node = <_Element>input
+    elif isinstance(input, _Document):
+        node = (<_Document>input).getroot()
+    else:
+        raise TypeError, f"Invalid input object: {python._fqtypename(input).decode('utf8')}"
+    if (node is None or not node._c_node or
+            node._c_node.type != tree.XML_ELEMENT_NODE):
+        raise ValueError, f"Input object is not an XML element: {python._fqtypename(input).decode('utf8')}"
+    _assertValidNode(node)
+    return node
+
+cdef bint _isAncestorOrSame(xmlNode* c_ancestor, xmlNode* c_node) noexcept:
+    while c_node:
+        if c_node is c_ancestor:
+            return True
+        c_node = c_node.parent
+    return False
+
+cdef _Element _makeElement(tag, xmlDoc* c_doc, _Document doc,
+                           _BaseParser parser, text, tail, attrib, nsmap,
+                           dict extra_attrs):
+    """Create a new element and initialize text content, namespaces and
+    attributes.
+
+    This helper function will reuse as much of the existing document as
+    possible:
+
+    If 'parser' is None, the parser will be inherited from 'doc' or the
+    default parser will be used.
+
+    If 'doc' is None, 'c_doc' is used to create a new _Document and the new
+    element is made its root node.
+
+    If 'c_doc' is also NULL, a new xmlDoc will be created.
+    """
+    cdef xmlNode* c_node
+    if doc is not None:
+        c_doc = doc._c_doc
+    ns_utf, name_utf = _getNsTag(tag)
+    if parser is not None and parser._for_html:
+        _htmlTagValidOrRaise(name_utf)
+        if c_doc is NULL:
+            c_doc = _newHTMLDoc()
+    else:
+        _tagValidOrRaise(name_utf)
+        if c_doc is NULL:
+            c_doc = _newXMLDoc()
+    c_node = _createElement(c_doc, name_utf)
+    if c_node is NULL:
+        if doc is None and c_doc is not NULL:
+            tree.xmlFreeDoc(c_doc)
+        raise MemoryError()
+    try:
+        if doc is None:
+            tree.xmlDocSetRootElement(c_doc, c_node)
+            doc = _documentFactory(c_doc, parser)
+        if text is not None:
+            _setNodeText(c_node, text)
+        if tail is not None:
+            _setTailText(c_node, tail)
+        # add namespaces to node if necessary
+        _setNodeNamespaces(c_node, doc, ns_utf, nsmap)
+        _initNodeAttributes(c_node, doc, attrib, extra_attrs)
+        return _elementFactory(doc, c_node)
+    except:
+        # free allocated c_node/c_doc unless Python does it for us
+        if c_node.doc is not c_doc:
+            # node not yet in document => will not be freed by document
+            if tail is not None:
+                _removeText(c_node.next) # tail
+            tree.xmlFreeNode(c_node)
+        if doc is None:
+            # c_doc will not be freed by doc
+            tree.xmlFreeDoc(c_doc)
+        raise
+
+cdef int _initNewElement(_Element element, bint is_html, name_utf, ns_utf,
+                         _BaseParser parser, attrib, nsmap, dict extra_attrs) except -1:
+    """Initialise a new Element object.
+
+    This is used when users instantiate a Python Element subclass
+    directly, without it being mapped to an existing XML node.
+    """
+    cdef xmlDoc* c_doc
+    cdef xmlNode* c_node
+    cdef _Document doc
+    if is_html:
+        _htmlTagValidOrRaise(name_utf)
+        c_doc = _newHTMLDoc()
+    else:
+        _tagValidOrRaise(name_utf)
+        c_doc = _newXMLDoc()
+    c_node = _createElement(c_doc, name_utf)
+    if c_node is NULL:
+        if c_doc is not NULL:
+            tree.xmlFreeDoc(c_doc)
+        raise MemoryError()
+    tree.xmlDocSetRootElement(c_doc, c_node)
+    doc = _documentFactory(c_doc, parser)
+    # add namespaces to node if necessary
+    _setNodeNamespaces(c_node, doc, ns_utf, nsmap)
+    _initNodeAttributes(c_node, doc, attrib, extra_attrs)
+    _registerProxy(element, doc, c_node)
+    element._init()
+    return 0
+
+cdef _Element _makeSubElement(_Element parent, tag, text, tail,
+                              attrib, nsmap, dict extra_attrs):
+    """Create a new child element and initialize text content, namespaces and
+    attributes.
+    """
+    cdef xmlNode* c_node
+    cdef xmlDoc* c_doc
+    if parent is None or parent._doc is None:
+        return None
+    _assertValidNode(parent)
+    ns_utf, name_utf = _getNsTag(tag)
+    c_doc = parent._doc._c_doc
+
+    if parent._doc._parser is not None and parent._doc._parser._for_html:
+        _htmlTagValidOrRaise(name_utf)
+    else:
+        _tagValidOrRaise(name_utf)
+
+    c_node = _createElement(c_doc, name_utf)
+    if c_node is NULL:
+        raise MemoryError()
+    tree.xmlAddChild(parent._c_node, c_node)
+
+    try:
+        if text is not None:
+            _setNodeText(c_node, text)
+        if tail is not None:
+            _setTailText(c_node, tail)
+
+        # add namespaces to node if necessary
+        _setNodeNamespaces(c_node, parent._doc, ns_utf, nsmap)
+        _initNodeAttributes(c_node, parent._doc, attrib, extra_attrs)
+        return _elementFactory(parent._doc, c_node)
+    except:
+        # make sure we clean up in case of an error
+        _removeNode(parent._doc, c_node)
+        raise
+
+
+cdef int _setNodeNamespaces(xmlNode* c_node, _Document doc,
+                            object node_ns_utf, object nsmap) except -1:
+    """Lookup current namespace prefixes, then set namespace structure for
+    node (if 'node_ns_utf' was provided) and register new ns-prefix mappings.
+
+    'node_ns_utf' should only be passed for a newly created node.
+    """
+    cdef xmlNs* c_ns
+    cdef list nsdefs
+
+    if nsmap:
+        for prefix, href in _iter_nsmap(nsmap):
+            href_utf = _utf8(href)
+            _uriValidOrRaise(href_utf)
+            c_href = _xcstr(href_utf)
+            if prefix is not None:
+                prefix_utf = _utf8(prefix)
+                _prefixValidOrRaise(prefix_utf)
+                c_prefix = _xcstr(prefix_utf)
+            else:
+                c_prefix = <const_xmlChar*>NULL
+            # add namespace with prefix if it is not already known
+            c_ns = tree.xmlSearchNs(doc._c_doc, c_node, c_prefix)
+            if c_ns is NULL or \
+                    c_ns.href is NULL or \
+                    tree.xmlStrcmp(c_ns.href, c_href) != 0:
+                c_ns = tree.xmlNewNs(c_node, c_href, c_prefix)
+            if href_utf == node_ns_utf:
+                tree.xmlSetNs(c_node, c_ns)
+                node_ns_utf = None
+
+    if node_ns_utf is not None:
+        _uriValidOrRaise(node_ns_utf)
+        doc._setNodeNs(c_node, _xcstr(node_ns_utf))
+    return 0
+
+
+cdef dict _build_nsmap(xmlNode* c_node):
+    """
+    Namespace prefix->URI mapping known in the context of this Element.
+    This includes all namespace declarations of the parents.
+    """
+    cdef xmlNs* c_ns
+    nsmap = {}
+    while c_node is not NULL and c_node.type == tree.XML_ELEMENT_NODE:
+        c_ns = c_node.nsDef
+        while c_ns is not NULL:
+            if c_ns.prefix or c_ns.href:
+                prefix = funicodeOrNone(c_ns.prefix)
+                if prefix not in nsmap:
+                    nsmap[prefix] = funicodeOrNone(c_ns.href)
+            c_ns = c_ns.next
+        c_node = c_node.parent
+    return nsmap
+
+
+cdef _iter_nsmap(nsmap):
+    """
+    Create a reproducibly ordered iterable from an nsmap mapping.
+    Tries to preserve an existing order and sorts if it assumes no order.
+
+    The difference to _iter_attrib() is that None doesn't sort with strings
+    in Py3.x.
+    """
+    if isinstance(nsmap, dict):
+        # dicts are insertion-ordered in Py3.6+ => keep the user provided order.
+        return nsmap.items()
+    if len(nsmap) <= 1:
+        return nsmap.items()
+    # nsmap will usually be a plain unordered dict => avoid type checking overhead
+    if type(nsmap) is not dict and isinstance(nsmap, OrderedDict):
+        return nsmap.items()  # keep existing order
+    if None not in nsmap:
+        return sorted(nsmap.items())
+
+    # Move the default namespace to the end.  This makes sure libxml2
+    # prefers a prefix if the ns is defined redundantly on the same
+    # element.  That way, users can work around a problem themselves
+    # where default namespace attributes on non-default namespaced
+    # elements serialise without prefix (i.e. into the non-default
+    # namespace).
+    default_ns = nsmap[None]
+    nsdefs = [(k, v) for k, v in nsmap.items() if k is not None]
+    nsdefs.sort()
+    nsdefs.append((None, default_ns))
+    return nsdefs
+
+
+cdef _iter_attrib(attrib):
+    """
+    Create a reproducibly ordered iterable from an attrib mapping.
+    Tries to preserve an existing order and sorts if it assumes no order.
+    """
+    # dicts are insertion-ordered in Py3.6+ => keep the user provided order.
+    if isinstance(attrib, (dict, _Attrib, OrderedDict)):
+        return attrib.items()
+    # assume it's an unordered mapping of some kind
+    return sorted(attrib.items())
+
+
+cdef _initNodeAttributes(xmlNode* c_node, _Document doc, attrib, dict extra):
+    """Initialise the attributes of an element node.
+    """
+    cdef bint is_html
+    cdef xmlNs* c_ns
+    if attrib is not None and not hasattr(attrib, 'items'):
+        raise TypeError, f"Invalid attribute dictionary: {python._fqtypename(attrib).decode('utf8')}"
+    if not attrib and not extra:
+        return  # nothing to do
+    is_html = doc._parser._for_html
+    seen = set()
+    if extra:
+        for name, value in extra.items():
+            _addAttributeToNode(c_node, doc, is_html, name, value, seen)
+    if attrib:
+        for name, value in _iter_attrib(attrib):
+            _addAttributeToNode(c_node, doc, is_html, name, value, seen)
+
+
+cdef int _addAttributeToNode(xmlNode* c_node, _Document doc, bint is_html,
+                             name, value, set seen_tags) except -1:
+    ns_utf, name_utf = tag = _getNsTag(name)
+    if tag in seen_tags:
+        return 0
+    seen_tags.add(tag)
+    if not is_html:
+        _attributeValidOrRaise(name_utf)
+    value_utf = _utf8(value)
+    if ns_utf is None:
+        tree.xmlNewProp(c_node, _xcstr(name_utf), _xcstr(value_utf))
+    else:
+        _uriValidOrRaise(ns_utf)
+        c_ns = doc._findOrBuildNodeNs(c_node, _xcstr(ns_utf), NULL, 1)
+        tree.xmlNewNsProp(c_node, c_ns,
+                          _xcstr(name_utf), _xcstr(value_utf))
+    return 0
+
+
+ctypedef struct _ns_node_ref:
+    xmlNs* ns
+    xmlNode* node
+
+
+cdef int _collectNsDefs(xmlNode* c_element, _ns_node_ref **_c_ns_list,
+                        size_t *_c_ns_list_len, size_t *_c_ns_list_size) except -1:
+    c_ns_list = _c_ns_list[0]
+    cdef size_t c_ns_list_len = _c_ns_list_len[0]
+    cdef size_t c_ns_list_size = _c_ns_list_size[0]
+
+    c_nsdef = c_element.nsDef
+    while c_nsdef is not NULL:
+        if c_ns_list_len >= c_ns_list_size:
+            if c_ns_list is NULL:
+                c_ns_list_size = 20
+            else:
+                c_ns_list_size *= 2
+            c_nsref_ptr = <_ns_node_ref*> python.lxml_realloc(
+                c_ns_list, c_ns_list_size, sizeof(_ns_node_ref))
+            if c_nsref_ptr is NULL:
+                if c_ns_list is not NULL:
+                    python.lxml_free(c_ns_list)
+                    _c_ns_list[0] = NULL
+                raise MemoryError()
+            c_ns_list = c_nsref_ptr
+
+        c_ns_list[c_ns_list_len] = _ns_node_ref(c_nsdef, c_element)
+        c_ns_list_len += 1
+        c_nsdef = c_nsdef.next
+
+    _c_ns_list_size[0] = c_ns_list_size
+    _c_ns_list_len[0] = c_ns_list_len
+    _c_ns_list[0] = c_ns_list
+
+
+cdef int _removeUnusedNamespaceDeclarations(xmlNode* c_element, set prefixes_to_keep) except -1:
+    """Remove any namespace declarations from a subtree that are not used by
+    any of its elements (or attributes).
+
+    If a 'prefixes_to_keep' is provided, it must be a set of prefixes.
+    Any corresponding namespace mappings will not be removed as part of the cleanup.
+    """
+    cdef xmlNode* c_node
+    cdef _ns_node_ref* c_ns_list = NULL
+    cdef size_t c_ns_list_size = 0
+    cdef size_t c_ns_list_len = 0
+    cdef size_t i
+
+    if c_element.parent and c_element.parent.type == tree.XML_DOCUMENT_NODE:
+        # include declarations on the document node
+        _collectNsDefs(c_element.parent, &c_ns_list, &c_ns_list_len, &c_ns_list_size)
+
+    tree.BEGIN_FOR_EACH_ELEMENT_FROM(c_element, c_element, 1)
+    # collect all new namespace declarations into the ns list
+    if c_element.nsDef:
+        _collectNsDefs(c_element, &c_ns_list, &c_ns_list_len, &c_ns_list_size)
+
+    # remove all namespace declarations from the list that are referenced
+    if c_ns_list_len and c_element.type == tree.XML_ELEMENT_NODE:
+        c_node = c_element
+        while c_node and c_ns_list_len:
+            if c_node.ns:
+                for i in range(c_ns_list_len):
+                    if c_node.ns is c_ns_list[i].ns:
+                        c_ns_list_len -= 1
+                        c_ns_list[i] = c_ns_list[c_ns_list_len]
+                        #c_ns_list[c_ns_list_len] = _ns_node_ref(NULL, NULL)
+                        break
+            if c_node is c_element:
+                # continue with attributes
+                c_node = <xmlNode*>c_element.properties
+            else:
+                c_node = c_node.next
+    tree.END_FOR_EACH_ELEMENT_FROM(c_element)
+
+    if c_ns_list is NULL:
+        return 0
+
+    # free all namespace declarations that remained in the list,
+    # except for those we should keep explicitly
+    cdef xmlNs* c_nsdef
+    for i in range(c_ns_list_len):
+        if prefixes_to_keep is not None:
+            if c_ns_list[i].ns.prefix and c_ns_list[i].ns.prefix in prefixes_to_keep:
+                continue
+        c_node = c_ns_list[i].node
+        c_nsdef = c_node.nsDef
+        if c_nsdef is c_ns_list[i].ns:
+            c_node.nsDef = c_node.nsDef.next
+        else:
+            while c_nsdef.next is not c_ns_list[i].ns:
+                c_nsdef = c_nsdef.next
+            c_nsdef.next = c_nsdef.next.next
+        tree.xmlFreeNs(c_ns_list[i].ns)
+    
+    if c_ns_list is not NULL:
+        python.lxml_free(c_ns_list)
+    return 0
+
+cdef xmlNs* _searchNsByHref(xmlNode* c_node, const_xmlChar* c_href, bint is_attribute) noexcept:
+    """Search a namespace declaration that covers a node (element or
+    attribute).
+
+    For attributes, try to find a prefixed namespace declaration
+    instead of the default namespaces.  This helps in supporting
+    round-trips for attributes on elements with a different namespace.
+    """
+    cdef xmlNs* c_ns
+    cdef xmlNs* c_default_ns = NULL
+    cdef xmlNode* c_element
+    if c_href is NULL or c_node is NULL or c_node.type == tree.XML_ENTITY_REF_NODE:
+        return NULL
+    if tree.xmlStrcmp(c_href, tree.XML_XML_NAMESPACE) == 0:
+        # no special cases here, let libxml2 handle this
+        return tree.xmlSearchNsByHref(c_node.doc, c_node, c_href)
+    if c_node.type == tree.XML_ATTRIBUTE_NODE:
+        is_attribute = 1
+    while c_node is not NULL and c_node.type != tree.XML_ELEMENT_NODE:
+        c_node = c_node.parent
+    c_element = c_node
+    while c_node is not NULL:
+        if c_node.type == tree.XML_ELEMENT_NODE:
+            c_ns = c_node.nsDef
+            while c_ns is not NULL:
+                if c_ns.href is not NULL and tree.xmlStrcmp(c_href, c_ns.href) == 0:
+                    if c_ns.prefix is NULL and is_attribute:
+                        # for attributes, continue searching a named
+                        # prefix, but keep the first default namespace
+                        # declaration that we found
+                        if c_default_ns is NULL:
+                            c_default_ns = c_ns
+                    elif tree.xmlSearchNs(
+                        c_element.doc, c_element, c_ns.prefix) is c_ns:
+                        # start node is in namespace scope => found!
+                        return c_ns
+                c_ns = c_ns.next
+            if c_node is not c_element and c_node.ns is not NULL:
+                # optimise: the node may have the namespace itself
+                c_ns = c_node.ns
+                if c_ns.href is not NULL and tree.xmlStrcmp(c_href, c_ns.href) == 0:
+                    if c_ns.prefix is NULL and is_attribute:
+                        # for attributes, continue searching a named
+                        # prefix, but keep the first default namespace
+                        # declaration that we found
+                        if c_default_ns is NULL:
+                            c_default_ns = c_ns
+                    elif tree.xmlSearchNs(
+                        c_element.doc, c_element, c_ns.prefix) is c_ns:
+                        # start node is in namespace scope => found!
+                        return c_ns
+        c_node = c_node.parent
+    # nothing found => use a matching default namespace or fail
+    if c_default_ns is not NULL:
+        if tree.xmlSearchNs(c_element.doc, c_element, NULL) is c_default_ns:
+            return c_default_ns
+    return NULL
+
+cdef int _replaceNodeByChildren(_Document doc, xmlNode* c_node) except -1:
+    # NOTE: this does not deallocate the node, just unlink it!
+    cdef xmlNode* c_parent
+    cdef xmlNode* c_child
+    if c_node.children is NULL:
+        tree.xmlUnlinkNode(c_node)
+        return 0
+
+    c_parent = c_node.parent
+    # fix parent links of children
+    c_child = c_node.children
+    while c_child is not NULL:
+        c_child.parent = c_parent
+        c_child = c_child.next
+
+    # fix namespace references of children if their parent's namespace
+    # declarations get lost
+    if c_node.nsDef is not NULL:
+        c_child = c_node.children
+        while c_child is not NULL:
+            moveNodeToDocument(doc, doc._c_doc, c_child)
+            c_child = c_child.next
+
+    # fix sibling links to/from child slice
+    if c_node.prev is NULL:
+        c_parent.children = c_node.children
+    else:
+        c_node.prev.next = c_node.children
+        c_node.children.prev = c_node.prev
+    if c_node.next is NULL:
+        c_parent.last = c_node.last
+    else:
+        c_node.next.prev = c_node.last
+        c_node.last.next = c_node.next
+
+    # unlink c_node
+    c_node.children = c_node.last = NULL
+    c_node.parent = c_node.next = c_node.prev = NULL
+    return 0
+
+cdef unicode _attributeValue(xmlNode* c_element, xmlAttr* c_attrib_node):
+    c_href = _getNs(<xmlNode*>c_attrib_node)
+    value = tree.xmlGetNsProp(c_element, c_attrib_node.name, c_href)
+    try:
+        result = funicode(value)
+    finally:
+        tree.xmlFree(value)
+    return result
+
+cdef unicode _attributeValueFromNsName(xmlNode* c_element,
+                                       const_xmlChar* c_href, const_xmlChar* c_name):
+    c_result = tree.xmlGetNsProp(c_element, c_name, c_href)
+    if c_result is NULL:
+        return None
+    try:
+        result = funicode(c_result)
+    finally:
+        tree.xmlFree(c_result)
+    return result
+
+cdef object _getNodeAttributeValue(xmlNode* c_node, key, default):
+    ns, tag = _getNsTag(key)
+    c_href = <const_xmlChar*>NULL if ns is None else _xcstr(ns)
+    c_result = tree.xmlGetNsProp(c_node, _xcstr(tag), c_href)
+    if c_result is NULL:
+        # XXX free namespace that is not in use..?
+        return default
+    try:
+        result = funicode(c_result)
+    finally:
+        tree.xmlFree(c_result)
+    return result
+
+cdef inline object _getAttributeValue(_Element element, key, default):
+    return _getNodeAttributeValue(element._c_node, key, default)
+
+cdef int _setAttributeValue(_Element element, key, value) except -1:
+    cdef const_xmlChar* c_value
+    cdef xmlNs* c_ns
+    ns, tag = _getNsTag(key)
+    is_html = element._doc._parser._for_html
+    if not is_html:
+        _attributeValidOrRaise(tag)
+    c_tag = _xcstr(tag)
+    if value is None and is_html:
+        c_value = NULL
+    else:
+        if isinstance(value, QName):
+            value = _resolveQNameText(element, value)
+        else:
+            value = _utf8(value)
+        c_value = _xcstr(value)
+    if ns is None:
+        c_ns = NULL
+    else:
+        c_ns = element._doc._findOrBuildNodeNs(element._c_node, _xcstr(ns), NULL, 1)
+    tree.xmlSetNsProp(element._c_node, c_ns, c_tag, c_value)
+    return 0
+
+cdef int _delAttribute(_Element element, key) except -1:
+    ns, tag = _getNsTag(key)
+    c_href = <const_xmlChar*>NULL if ns is None else _xcstr(ns)
+    if _delAttributeFromNsName(element._c_node, c_href, _xcstr(tag)):
+        raise KeyError, key
+    return 0
+
+cdef int _delAttributeFromNsName(xmlNode* c_node, const_xmlChar* c_href, const_xmlChar* c_name) noexcept:
+    c_attr = tree.xmlHasNsProp(c_node, c_name, c_href)
+    if c_attr is NULL:
+        # XXX free namespace that is not in use..?
+        return -1
+    tree.xmlRemoveProp(c_attr)
+    return 0
+
+cdef list _collectAttributes(xmlNode* c_node, int collecttype):
+    """Collect all attributes of a node in a list.  Depending on collecttype,
+    it collects either the name (1), the value (2) or the name-value tuples.
+    """
+    cdef Py_ssize_t count
+    c_attr = c_node.properties
+    count = 0
+    while c_attr is not NULL:
+        if c_attr.type == tree.XML_ATTRIBUTE_NODE:
+            count += 1
+        c_attr = c_attr.next
+
+    if not count:
+        return []
+
+    attributes = [None] * count
+    c_attr = c_node.properties
+    count = 0
+    while c_attr is not NULL:
+        if c_attr.type == tree.XML_ATTRIBUTE_NODE:
+            if collecttype == 1:
+                item = _namespacedName(<xmlNode*>c_attr)
+            elif collecttype == 2:
+                item = _attributeValue(c_node, c_attr)
+            else:
+                item = (_namespacedName(<xmlNode*>c_attr),
+                        _attributeValue(c_node, c_attr))
+            attributes[count] = item
+            count += 1
+        c_attr = c_attr.next
+    return attributes
+
+cdef object __RE_XML_ENCODING = re.compile(
+    r'^(<\?xml[^>]+)\s+encoding\s*=\s*["\'][^"\']*["\'](\s*\?>|)', re.U)
+
+cdef object __REPLACE_XML_ENCODING = __RE_XML_ENCODING.sub
+cdef object __HAS_XML_ENCODING = __RE_XML_ENCODING.match
+
+cdef object _stripEncodingDeclaration(object xml_string):
+    # this is a hack to remove the XML encoding declaration from unicode
+    return __REPLACE_XML_ENCODING(r'\g<1>\g<2>', xml_string)
+
+cdef bint _hasEncodingDeclaration(object xml_string) except -1:
+    # check if a (unicode) string has an XML encoding declaration
+    return __HAS_XML_ENCODING(xml_string) is not None
+
+cdef inline bint _hasText(xmlNode* c_node) noexcept:
+    return c_node is not NULL and _textNodeOrSkip(c_node.children) is not NULL
+
+cdef inline bint _hasTail(xmlNode* c_node) noexcept:
+    return c_node is not NULL and _textNodeOrSkip(c_node.next) is not NULL
+
+cdef inline bint _hasNonWhitespaceTail(xmlNode* c_node) except -1:
+    return _hasNonWhitespaceText(c_node, tail=True)
+
+cdef bint _hasNonWhitespaceText(xmlNode* c_node, bint tail=False) except -1:
+    c_text_node = c_node and _textNodeOrSkip(c_node.next if tail else c_node.children)
+    if c_text_node is NULL:
+        return False
+    while c_text_node is not NULL:
+        if c_text_node.content[0] != c'\0' and not _collectText(c_text_node).isspace():
+            return True
+        c_text_node = _textNodeOrSkip(c_text_node.next)
+    return False
+
+cdef unicode _collectText(xmlNode* c_node):
+    """Collect all text nodes and return them as a unicode string.
+
+    Start collecting at c_node.
+    
+    If there was no text to collect, return None
+    """
+    cdef Py_ssize_t scount
+    cdef xmlChar* c_text
+    cdef xmlNode* c_node_cur
+    # check for multiple text nodes
+    scount = 0
+    c_text = NULL
+    c_node_cur = c_node = _textNodeOrSkip(c_node)
+    while c_node_cur is not NULL:
+        if c_node_cur.content[0] != c'\0':
+            c_text = c_node_cur.content
+        scount += 1
+        c_node_cur = _textNodeOrSkip(c_node_cur.next)
+
+    # handle two most common cases first
+    if c_text is NULL:
+        return '' if scount > 0 else None
+    if scount == 1:
+        return funicode(c_text)
+
+    # the rest is not performance critical anymore
+    result = b''
+    while c_node is not NULL:
+        result += <unsigned char*>c_node.content
+        c_node = _textNodeOrSkip(c_node.next)
+    return funicode(<const_xmlChar*><unsigned char*>result)
+
+cdef void _removeText(xmlNode* c_node) noexcept:
+    """Remove all text nodes.
+
+    Start removing at c_node.
+    """
+    cdef xmlNode* c_next
+    c_node = _textNodeOrSkip(c_node)
+    while c_node is not NULL:
+        c_next = _textNodeOrSkip(c_node.next)
+        tree.xmlUnlinkNode(c_node)
+        tree.xmlFreeNode(c_node)
+        c_node = c_next
+
+cdef xmlNode* _createTextNode(xmlDoc* doc, value) except NULL:
+    cdef xmlNode* c_text_node
+    if isinstance(value, CDATA):
+        c_text_node = tree.xmlNewCDataBlock(
+            doc, _xcstr((<CDATA>value)._utf8_data),
+            python.PyBytes_GET_SIZE((<CDATA>value)._utf8_data))
+    else:
+        text = _utf8(value)
+        c_text_node = tree.xmlNewDocText(doc, _xcstr(text))
+    if not c_text_node:
+        raise MemoryError()
+    return c_text_node
+
+cdef int _setNodeText(xmlNode* c_node, value) except -1:
+    # remove all text nodes at the start first
+    _removeText(c_node.children)
+    if value is None:
+        return 0
+    # now add new text node with value at start
+    c_text_node = _createTextNode(c_node.doc, value)
+    if c_node.children is NULL:
+        tree.xmlAddChild(c_node, c_text_node)
+    else:
+        tree.xmlAddPrevSibling(c_node.children, c_text_node)
+    return 0
+
+cdef int _setTailText(xmlNode* c_node, value) except -1:
+    # remove all text nodes at the start first
+    _removeText(c_node.next)
+    if value is None:
+        return 0
+    # now append new text node with value
+    c_text_node = _createTextNode(c_node.doc, value)
+    tree.xmlAddNextSibling(c_node, c_text_node)
+    return 0
+
+cdef bytes _resolveQNameText(_Element element, value):
+    cdef xmlNs* c_ns
+    ns, tag = _getNsTag(value)
+    if ns is None:
+        return tag
+    else:
+        c_ns = element._doc._findOrBuildNodeNs(
+            element._c_node, _xcstr(ns), NULL, 0)
+        return python.PyBytes_FromFormat('%s:%s', c_ns.prefix, _cstr(tag))
+
+cdef inline bint _hasChild(xmlNode* c_node) noexcept:
+    return c_node is not NULL and _findChildForwards(c_node, 0) is not NULL
+
+cdef inline Py_ssize_t _countElements(xmlNode* c_node) noexcept:
+    "Counts the elements within the following siblings and the node itself."
+    cdef Py_ssize_t count
+    count = 0
+    while c_node is not NULL:
+        if _isElement(c_node):
+            count += 1
+        c_node = c_node.next
+    return count
+
+cdef int _findChildSlice(
+    slice sliceobject, xmlNode* c_parent,
+    xmlNode** c_start_node, Py_ssize_t* c_step, Py_ssize_t* c_length) except -1:
+    """Resolve a children slice.
+
+    Returns the start node, step size and the slice length in the
+    pointer arguments.
+    """
+    cdef Py_ssize_t start = 0, stop = 0, childcount
+    childcount = _countElements(c_parent.children)
+    if childcount == 0:
+        c_start_node[0] = NULL
+        c_length[0] = 0
+        if sliceobject.step is None:
+            c_step[0] = 1
+        else:
+            python._PyEval_SliceIndex(sliceobject.step, c_step)
+        return 0
+    python.PySlice_GetIndicesEx(
+        sliceobject, childcount, &start, &stop, c_step, c_length)
+    if start > childcount // 2:
+        c_start_node[0] = _findChildBackwards(c_parent, childcount - start - 1)
+    else:
+        c_start_node[0] = _findChild(c_parent, start)
+    return 0
+
+cdef bint _isFullSlice(slice sliceobject) except -1:
+    """Conservative guess if this slice is a full slice as in ``s[:]``.
+    """
+    cdef Py_ssize_t step = 0
+    if sliceobject is None:
+        return 0
+    if sliceobject.start is None and \
+            sliceobject.stop is None:
+        if sliceobject.step is None:
+            return 1
+        python._PyEval_SliceIndex(sliceobject.step, &step)
+        if step == 1:
+            return 1
+        return 0
+    return 0
+
+cdef _collectChildren(_Element element):
+    cdef xmlNode* c_node
+    cdef list result = []
+    c_node = element._c_node.children
+    if c_node is not NULL:
+        if not _isElement(c_node):
+            c_node = _nextElement(c_node)
+        while c_node is not NULL:
+            result.append(_elementFactory(element._doc, c_node))
+            c_node = _nextElement(c_node)
+    return result
+
+cdef inline xmlNode* _findChild(xmlNode* c_node, Py_ssize_t index) noexcept:
+    if index < 0:
+        return _findChildBackwards(c_node, -index - 1)
+    else:
+        return _findChildForwards(c_node, index)
+    
+cdef inline xmlNode* _findChildForwards(xmlNode* c_node, Py_ssize_t index) noexcept:
+    """Return child element of c_node with index, or return NULL if not found.
+    """
+    cdef xmlNode* c_child
+    cdef Py_ssize_t c
+    c_child = c_node.children
+    c = 0
+    while c_child is not NULL:
+        if _isElement(c_child):
+            if c == index:
+                return c_child
+            c += 1
+        c_child = c_child.next
+    return NULL
+
+cdef inline xmlNode* _findChildBackwards(xmlNode* c_node, Py_ssize_t index) noexcept:
+    """Return child element of c_node with index, or return NULL if not found.
+    Search from the end.
+    """
+    cdef xmlNode* c_child
+    cdef Py_ssize_t c
+    c_child = c_node.last
+    c = 0
+    while c_child is not NULL:
+        if _isElement(c_child):
+            if c == index:
+                return c_child
+            c += 1
+        c_child = c_child.prev
+    return NULL
+    
+cdef inline xmlNode* _textNodeOrSkip(xmlNode* c_node) noexcept nogil:
+    """Return the node if it's a text node.  Skip over ignorable nodes in a
+    series of text nodes.  Return NULL if a non-ignorable node is found.
+
+    This is used to skip over XInclude nodes when collecting adjacent text
+    nodes.
+    """
+    while c_node is not NULL:
+        if c_node.type == tree.XML_TEXT_NODE or \
+               c_node.type == tree.XML_CDATA_SECTION_NODE:
+            return c_node
+        elif c_node.type == tree.XML_XINCLUDE_START or \
+                 c_node.type == tree.XML_XINCLUDE_END:
+            c_node = c_node.next
+        else:
+            return NULL
+    return NULL
+
+cdef inline xmlNode* _nextElement(xmlNode* c_node) noexcept:
+    """Given a node, find the next sibling that is an element.
+    """
+    if c_node is NULL:
+        return NULL
+    c_node = c_node.next
+    while c_node is not NULL:
+        if _isElement(c_node):
+            return c_node
+        c_node = c_node.next
+    return NULL
+
+cdef inline xmlNode* _previousElement(xmlNode* c_node) noexcept:
+    """Given a node, find the next sibling that is an element.
+    """
+    if c_node is NULL:
+        return NULL
+    c_node = c_node.prev
+    while c_node is not NULL:
+        if _isElement(c_node):
+            return c_node
+        c_node = c_node.prev
+    return NULL
+
+cdef inline xmlNode* _parentElement(xmlNode* c_node) noexcept:
+    "Given a node, find the parent element."
+    if c_node is NULL or not _isElement(c_node):
+        return NULL
+    c_node = c_node.parent
+    if c_node is NULL or not _isElement(c_node):
+        return NULL
+    return c_node
+
+cdef inline bint _tagMatches(xmlNode* c_node, const_xmlChar* c_href, const_xmlChar* c_name) noexcept:
+    """Tests if the node matches namespace URI and tag name.
+
+    A node matches if it matches both c_href and c_name.
+
+    A node matches c_href if any of the following is true:
+    * c_href is NULL
+    * its namespace is NULL and c_href is the empty string
+    * its namespace string equals the c_href string
+
+    A node matches c_name if any of the following is true:
+    * c_name is NULL
+    * its name string equals the c_name string
+    """
+    if c_node is NULL:
+        return 0
+    if c_node.type != tree.XML_ELEMENT_NODE:
+        # not an element, only succeed if we match everything
+        return c_name is NULL and c_href is NULL
+    if c_name is NULL:
+        if c_href is NULL:
+            # always match
+            return 1
+        else:
+            c_node_href = _getNs(c_node)
+            if c_node_href is NULL:
+                return c_href[0] == c'\0'
+            else:
+                return tree.xmlStrcmp(c_node_href, c_href) == 0
+    elif c_href is NULL:
+        if _getNs(c_node) is not NULL:
+            return 0
+        return c_node.name == c_name or tree.xmlStrcmp(c_node.name, c_name) == 0
+    elif c_node.name == c_name or tree.xmlStrcmp(c_node.name, c_name) == 0:
+        c_node_href = _getNs(c_node)
+        if c_node_href is NULL:
+            return c_href[0] == c'\0'
+        else:
+            return tree.xmlStrcmp(c_node_href, c_href) == 0
+    else:
+        return 0
+
+cdef inline bint _tagMatchesExactly(xmlNode* c_node, qname* c_qname) noexcept:
+    """Tests if the node matches namespace URI and tag name.
+
+    This differs from _tagMatches() in that it does not consider a
+    NULL value in qname.href a wildcard, and that it expects the c_name
+    to be taken from the doc dict, i.e. it only compares the names by
+    address.
+
+    A node matches if it matches both href and c_name of the qname.
+
+    A node matches c_href if any of the following is true:
+    * its namespace is NULL and c_href is the empty string
+    * its namespace string equals the c_href string
+
+    A node matches c_name if any of the following is true:
+    * c_name is NULL
+    * its name string points to the same address (!) as c_name
+    """
+    return _nsTagMatchesExactly(_getNs(c_node), c_node.name, c_qname)
+
+cdef inline bint _nsTagMatchesExactly(const_xmlChar* c_node_href,
+                                      const_xmlChar* c_node_name,
+                                      qname* c_qname) noexcept:
+    """Tests if name and namespace URI match those of c_qname.
+
+    This differs from _tagMatches() in that it does not consider a
+    NULL value in qname.href a wildcard, and that it expects the c_name
+    to be taken from the doc dict, i.e. it only compares the names by
+    address.
+
+    A node matches if it matches both href and c_name of the qname.
+
+    A node matches c_href if any of the following is true:
+    * its namespace is NULL and c_href is the empty string
+    * its namespace string equals the c_href string
+
+    A node matches c_name if any of the following is true:
+    * c_name is NULL
+    * its name string points to the same address (!) as c_name
+    """
+    cdef char* c_href
+    if c_qname.c_name is not NULL and c_qname.c_name is not c_node_name:
+        return 0
+    if c_qname.href is NULL:
+        return 1
+    c_href = python.__cstr(c_qname.href)
+    if c_href[0] == b'\0':
+        return c_node_href is NULL or c_node_href[0] == b'\0'
+    elif c_node_href is NULL:
+        return 0
+    else:
+        return tree.xmlStrcmp(<const_xmlChar*>c_href, c_node_href) == 0
+
+cdef Py_ssize_t _mapTagsToQnameMatchArray(xmlDoc* c_doc, list ns_tags,
+                                          qname* c_ns_tags, bint force_into_dict) except -1:
+    """Map a sequence of (name, namespace) pairs to a qname array for efficient
+    matching with _tagMatchesExactly() above.
+
+    Note that each qname struct in the array owns its href byte string object
+    if it is not NULL.
+    """
+    cdef Py_ssize_t count = 0, i
+    cdef bytes ns, tag
+    for ns, tag in ns_tags:
+        if tag is None:
+            c_tag = <const_xmlChar*>NULL
+        elif force_into_dict:
+            c_tag = tree.xmlDictLookup(c_doc.dict, _xcstr(tag), len(tag))
+            if c_tag is NULL:
+                # clean up before raising the error
+                for i in xrange(count):
+                    cpython.ref.Py_XDECREF(c_ns_tags[i].href)
+                raise MemoryError()
+        else:
+            c_tag = tree.xmlDictExists(c_doc.dict, _xcstr(tag), len(tag))
+            if c_tag is NULL:
+                # not in the dict => not in the document
+                continue
+        c_ns_tags[count].c_name = c_tag
+        if ns is None:
+            c_ns_tags[count].href = NULL
+        else:
+            cpython.ref.Py_INCREF(ns) # keep an owned reference!
+            c_ns_tags[count].href = <python.PyObject*>ns
+        count += 1
+    return count
+
+cdef int _removeNode(_Document doc, xmlNode* c_node) except -1:
+    """Unlink and free a node and subnodes if possible.  Otherwise, make sure
+    it's self-contained.
+    """
+    cdef xmlNode* c_next
+    c_next = c_node.next
+    tree.xmlUnlinkNode(c_node)
+    _moveTail(c_next, c_node)
+    if not attemptDeallocation(c_node):
+        # make namespaces absolute
+        moveNodeToDocument(doc, c_node.doc, c_node)
+    return 0
+
+cdef int _removeSiblings(xmlNode* c_element, tree.xmlElementType node_type, bint with_tail) except -1:
+    cdef xmlNode* c_node
+    cdef xmlNode* c_next
+    c_node = c_element.next
+    while c_node is not NULL:
+        c_next = _nextElement(c_node)
+        if c_node.type == node_type:
+            if with_tail:
+                _removeText(c_node.next)
+            tree.xmlUnlinkNode(c_node)
+            attemptDeallocation(c_node)
+        c_node = c_next
+    c_node = c_element.prev
+    while c_node is not NULL:
+        c_next = _previousElement(c_node)
+        if c_node.type == node_type:
+            if with_tail:
+                _removeText(c_node.next)
+            tree.xmlUnlinkNode(c_node)
+            attemptDeallocation(c_node)
+        c_node = c_next
+    return 0
+
+cdef void _moveTail(xmlNode* c_tail, xmlNode* c_target) noexcept:
+    cdef xmlNode* c_next
+    # tail support: look for any text nodes trailing this node and 
+    # move them too
+    c_tail = _textNodeOrSkip(c_tail)
+    while c_tail is not NULL:
+        c_next = _textNodeOrSkip(c_tail.next)
+        c_target = tree.xmlAddNextSibling(c_target, c_tail)
+        c_tail = c_next
+
+cdef int _copyTail(xmlNode* c_tail, xmlNode* c_target) except -1:
+    cdef xmlNode* c_new_tail
+    # tail copying support: look for any text nodes trailing this node and
+    # copy it to the target node
+    c_tail = _textNodeOrSkip(c_tail)
+    while c_tail is not NULL:
+        if c_target.doc is not c_tail.doc:
+            c_new_tail = tree.xmlDocCopyNode(c_tail, c_target.doc, 0)
+        else:
+            c_new_tail = tree.xmlCopyNode(c_tail, 0)
+        if c_new_tail is NULL:
+            raise MemoryError()
+        c_target = tree.xmlAddNextSibling(c_target, c_new_tail)
+        c_tail = _textNodeOrSkip(c_tail.next)
+    return 0
+
+cdef int _copyNonElementSiblings(xmlNode* c_node, xmlNode* c_target) except -1:
+    cdef xmlNode* c_copy
+    cdef xmlNode* c_sibling = c_node
+    while c_sibling.prev != NULL and \
+            (c_sibling.prev.type == tree.XML_PI_NODE or
+             c_sibling.prev.type == tree.XML_COMMENT_NODE or
+             c_sibling.prev.type == tree.XML_DTD_NODE):
+        c_sibling = c_sibling.prev
+    while c_sibling != c_node:
+        if c_sibling.type == tree.XML_DTD_NODE:
+            c_copy = <xmlNode*>_copyDtd(<tree.xmlDtd*>c_sibling)
+            if c_sibling == <xmlNode*>c_node.doc.intSubset:
+                c_target.doc.intSubset = <tree.xmlDtd*>c_copy
+            else: # c_sibling == c_node.doc.extSubset
+                c_target.doc.extSubset = <tree.xmlDtd*>c_copy
+        else:
+            c_copy = tree.xmlDocCopyNode(c_sibling, c_target.doc, 1)
+            if c_copy is NULL:
+                raise MemoryError()
+        tree.xmlAddPrevSibling(c_target, c_copy)
+        c_sibling = c_sibling.next
+    while c_sibling.next != NULL and \
+            (c_sibling.next.type == tree.XML_PI_NODE or
+             c_sibling.next.type == tree.XML_COMMENT_NODE):
+        c_sibling = c_sibling.next
+        c_copy = tree.xmlDocCopyNode(c_sibling, c_target.doc, 1)
+        if c_copy is NULL:
+            raise MemoryError()
+        tree.xmlAddNextSibling(c_target, c_copy)
+
+cdef int _deleteSlice(_Document doc, xmlNode* c_node,
+                      Py_ssize_t count, Py_ssize_t step) except -1:
+    """Delete slice, ``count`` items starting with ``c_node`` with a step
+    width of ``step``.
+    """
+    cdef xmlNode* c_next
+    cdef Py_ssize_t c, i
+    cdef _node_to_node_function next_element
+    if c_node is NULL:
+        return 0
+    if step > 0:
+        next_element = _nextElement
+    else:
+        step = -step
+        next_element = _previousElement
+    # now start deleting nodes
+    c = 0
+    c_next = c_node
+    while c_node is not NULL and c < count:
+        for i in range(step):
+            c_next = next_element(c_next)
+            if c_next is NULL:
+                break
+        _removeNode(doc, c_node)
+        c += 1
+        c_node = c_next
+    return 0
+
+cdef int _replaceSlice(_Element parent, xmlNode* c_node,
+                       Py_ssize_t slicelength, Py_ssize_t step,
+                       bint left_to_right, elements) except -1:
+    """Replace the slice of ``count`` elements starting at ``c_node`` with
+    positive step width ``step`` by the Elements in ``elements``.  The
+    direction is given by the boolean argument ``left_to_right``.
+
+    ``c_node`` may be NULL to indicate the end of the children list.
+    """
+    cdef xmlNode* c_orig_neighbour
+    cdef xmlNode* c_next
+    cdef xmlDoc*  c_source_doc
+    cdef _Element element
+    cdef Py_ssize_t seqlength, i, c
+    cdef _node_to_node_function next_element
+    assert step > 0
+    if left_to_right:
+        next_element = _nextElement
+    else:
+        next_element = _previousElement
+
+    if not isinstance(elements, (list, tuple)):
+        elements = list(elements)
+
+    if step != 1 or not left_to_right:
+        # *replacing* children stepwise with list => check size!
+        seqlength = len(elements)
+        if seqlength != slicelength:
+            raise ValueError, f"attempt to assign sequence of size {seqlength} " \
+                f"to extended slice of size {slicelength}"
+
+    if c_node is NULL:
+        # no children yet => add all elements straight away
+        if left_to_right:
+            for element in elements:
+                assert element is not None, "Node must not be None"
+                _appendChild(parent, element)
+        else:
+            for element in elements:
+                assert element is not None, "Node must not be None"
+                _prependChild(parent, element)
+        return 0
+
+    # remove the elements first as some might be re-added
+    if left_to_right:
+        # L->R, remember left neighbour
+        c_orig_neighbour = _previousElement(c_node)
+    else:
+        # R->L, remember right neighbour
+        c_orig_neighbour = _nextElement(c_node)
+
+    # We remove the original slice elements one by one. Since we hold
+    # a Python reference to all elements that we will insert, it is
+    # safe to let _removeNode() try (and fail) to free them even if
+    # the element itself or one of its descendents will be reinserted.
+    c = 0
+    c_next = c_node
+    while c_node is not NULL and c < slicelength:
+        for i in range(step):
+            c_next = next_element(c_next)
+            if c_next is NULL:
+                break
+        _removeNode(parent._doc, c_node)
+        c += 1
+        c_node = c_next
+
+    # make sure each element is inserted only once
+    elements = iter(elements)
+
+    # find the first node right of the new insertion point
+    if left_to_right:
+        if c_orig_neighbour is not NULL:
+            c_node = next_element(c_orig_neighbour)
+        else:
+            # before the first element
+            c_node = _findChildForwards(parent._c_node, 0)
+    elif c_orig_neighbour is NULL:
+        # at the end, but reversed stepping
+        # append one element and go to the next insertion point
+        for element in elements:
+            assert element is not None, "Node must not be None"
+            _appendChild(parent, element)
+            c_node = element._c_node
+            if slicelength > 0:
+                slicelength -= 1
+                for i in range(1, step):
+                    c_node = next_element(c_node)
+                    if c_node is NULL:
+                        break
+            break
+    else:
+        c_node = c_orig_neighbour
+
+    if left_to_right:
+        # adjust step size after removing slice as we are not stepping
+        # over the newly inserted elements
+        step -= 1
+
+    # now insert elements where we removed them
+    if c_node is not NULL:
+        for element in elements:
+            assert element is not None, "Node must not be None"
+            _assertValidNode(element)
+            # move element and tail over
+            c_source_doc = element._c_node.doc
+            c_next = element._c_node.next
+            tree.xmlAddPrevSibling(c_node, element._c_node)
+            _moveTail(c_next, element._c_node)
+
+            # integrate element into new document
+            moveNodeToDocument(parent._doc, c_source_doc, element._c_node)
+
+            # stop at the end of the slice
+            if slicelength > 0:
+                slicelength -= 1
+                for i in range(step):
+                    c_node = next_element(c_node)
+                    if c_node is NULL:
+                        break
+                if c_node is NULL:
+                    break
+        else:
+            # everything inserted
+            return 0
+
+    # append the remaining elements at the respective end
+    if left_to_right:
+        for element in elements:
+            assert element is not None, "Node must not be None"
+            _assertValidNode(element)
+            _appendChild(parent, element)
+    else:
+        for element in elements:
+            assert element is not None, "Node must not be None"
+            _assertValidNode(element)
+            _prependChild(parent, element)
+
+    return 0
+
+
+cdef int _linkChild(xmlNode* c_parent, xmlNode* c_node) except -1:
+    """Adaptation of 'xmlAddChild()' that deep-fix the document links iteratively.
+    """
+    assert _isElement(c_node)
+    c_node.parent = c_parent
+    if c_parent.children is NULL:
+        c_parent.children = c_parent.last = c_node
+    else:
+        c_node.prev = c_parent.last
+        c_parent.last.next = c_node
+        c_parent.last = c_node
+
+    _setTreeDoc(c_node, c_parent.doc)
+    return 0
+
+
+cdef int _appendChild(_Element parent, _Element child) except -1:
+    """Append a new child to a parent element.
+    """
+    c_node = child._c_node
+    c_source_doc = c_node.doc
+    # prevent cycles
+    if _isAncestorOrSame(c_node, parent._c_node):
+        raise ValueError("cannot append parent to itself")
+    # store possible text node
+    c_next = c_node.next
+    # move node itself
+    tree.xmlUnlinkNode(c_node)
+    # do not call xmlAddChild() here since it would deep-traverse the tree
+    _linkChild(parent._c_node, c_node)
+    _moveTail(c_next, c_node)
+    # uh oh, elements may be pointing to different doc when
+    # parent element has moved; change them too..
+    moveNodeToDocument(parent._doc, c_source_doc, c_node)
+    return 0
+
+cdef int _prependChild(_Element parent, _Element child) except -1:
+    """Prepend a new child to a parent element.
+    """
+    c_node = child._c_node
+    c_source_doc = c_node.doc
+    # prevent cycles
+    if _isAncestorOrSame(c_node, parent._c_node):
+        raise ValueError("cannot append parent to itself")
+    # store possible text node
+    c_next = c_node.next
+    # move node itself
+    c_child = _findChildForwards(parent._c_node, 0)
+    if c_child is NULL:
+        tree.xmlUnlinkNode(c_node)
+        # do not call xmlAddChild() here since it would deep-traverse the tree
+        _linkChild(parent._c_node, c_node)
+    else:
+        tree.xmlAddPrevSibling(c_child, c_node)
+    _moveTail(c_next, c_node)
+    # uh oh, elements may be pointing to different doc when
+    # parent element has moved; change them too..
+    moveNodeToDocument(parent._doc, c_source_doc, c_node)
+    return 0
+
+cdef int _appendSibling(_Element element, _Element sibling) except -1:
+    """Add a new sibling behind an element.
+    """
+    return _addSibling(element, sibling, as_next=True)
+
+cdef int _prependSibling(_Element element, _Element sibling) except -1:
+    """Add a new sibling before an element.
+    """
+    return _addSibling(element, sibling, as_next=False)
+
+cdef int _addSibling(_Element element, _Element sibling, bint as_next) except -1:
+    c_node = sibling._c_node
+    c_source_doc = c_node.doc
+    # prevent cycles
+    if _isAncestorOrSame(c_node, element._c_node):
+        if element._c_node is c_node:
+            return 0  # nothing to do
+        raise ValueError("cannot add ancestor as sibling, please break cycle first")
+    # store possible text node
+    c_next = c_node.next
+    # move node itself
+    if as_next:
+        # must insert after any tail text
+        c_next_node = _nextElement(element._c_node)
+        if c_next_node is NULL:
+            c_next_node = element._c_node
+            while c_next_node.next:
+                c_next_node = c_next_node.next
+            tree.xmlAddNextSibling(c_next_node, c_node)
+        else:
+            tree.xmlAddPrevSibling(c_next_node, c_node)
+    else:
+        tree.xmlAddPrevSibling(element._c_node, c_node)
+    _moveTail(c_next, c_node)
+    # uh oh, elements may be pointing to different doc when
+    # parent element has moved; change them too..
+    moveNodeToDocument(element._doc, c_source_doc, c_node)
+    return 0
+
+cdef inline bint isutf8(const_xmlChar* s) noexcept:
+    cdef xmlChar c = s[0]
+    while c != c'\0':
+        if c & 0x80:
+            return True
+        s += 1
+        c = s[0]
+    return False
+
+cdef bint isutf8l(const_xmlChar* s, size_t length) noexcept:
+    """
+    Search for non-ASCII characters in the string, knowing its length in advance.
+    """
+    cdef unsigned int i
+    cdef unsigned long non_ascii_mask
+    cdef const unsigned long *lptr = <const unsigned long*> s
+
+    cdef const unsigned long *end = lptr + length // sizeof(unsigned long)
+    if length >= sizeof(non_ascii_mask):
+        # Build constant 0x80808080... mask (and let the C compiler fold it).
+        non_ascii_mask = 0
+        for i in range(sizeof(non_ascii_mask) // 2):
+            non_ascii_mask = (non_ascii_mask << 16) | 0x8080
+
+        # Advance to long-aligned character before we start reading longs.
+        while (<size_t>s) % sizeof(unsigned long) and s < <const_xmlChar *>end:
+            if s[0] & 0x80:
+                return True
+            s += 1
+
+        # Read one long at a time
+        lptr = <const unsigned long*> s
+        while lptr < end:
+            if lptr[0] & non_ascii_mask:
+                return True
+            lptr += 1
+        s = <const_xmlChar *>lptr
+
+    while s < (<const_xmlChar *>end + length % sizeof(unsigned long)):
+        if s[0] & 0x80:
+            return True
+        s += 1
+
+    return False
+
+cdef int _is_valid_xml_ascii(bytes pystring) except -1:
+    """Check if a string is XML ascii content."""
+    cdef signed char ch
+    # When ch is a *signed* char, non-ascii characters are negative integers
+    # and xmlIsChar_ch does not accept them.
+    for ch in pystring:
+        if not tree.xmlIsChar_ch(ch):
+            return 0
+    return 1
+
+cdef bint _is_valid_xml_utf8(bytes pystring) except -1:
+    """Check if a string is like valid UTF-8 XML content."""
+    cdef const_xmlChar* s = _xcstr(pystring)
+    cdef const_xmlChar* c_end = s + len(pystring)
+    cdef unsigned long next3 = 0
+    if s < c_end - 2:
+        next3 = (s[0] << 8) | (s[1])
+
+    while s < c_end - 2:
+        next3 = 0x00ffffff & ((next3 << 8) | s[2])
+        if s[0] & 0x80:
+            # 0xefbfbe and 0xefbfbf are utf-8 encodings of
+            # forbidden characters \ufffe and \uffff
+            if next3 == 0x00efbfbe or next3 == 0x00efbfbf:
+                return 0
+            # 0xeda080 and 0xedbfbf are utf-8 encodings of
+            # \ud800 and \udfff. Anything between them (inclusive)
+            # is forbidden, because they are surrogate blocks in utf-16.
+            if 0x00eda080 <= next3 <= 0x00edbfbf:
+                return 0
+        elif not tree.xmlIsChar_ch(s[0]):
+            return 0  # invalid ascii char
+        s += 1
+
+    while s < c_end:
+        if not s[0] & 0x80 and not tree.xmlIsChar_ch(s[0]):
+            return 0  # invalid ascii char
+        s += 1
+
+    return 1
+
+cdef inline unicode funicodeOrNone(const_xmlChar* s):
+    return funicode(s) if s is not NULL else None
+
+cdef inline unicode funicodeOrEmpty(const_xmlChar* s):
+    return funicode(s) if s is not NULL else ''
+
+cdef unicode funicode(const_xmlChar* s):
+    return s.decode('UTF-8')
+
+cdef bytes _utf8(object s):
+    """Test if a string is valid user input and encode it to UTF-8.
+    Reject all bytes/unicode input that contains non-XML characters.
+    Reject all bytes input that contains non-ASCII characters.
+    """
+    cdef int valid
+    cdef bytes utf8_string
+    if isinstance(s, unicode):
+        utf8_string = (<unicode>s).encode('utf8')
+        valid = _is_valid_xml_utf8(utf8_string)
+    elif isinstance(s, (bytes, bytearray)):
+        utf8_string = s if type(s) is bytes else bytes(s)
+        valid = _is_valid_xml_ascii(utf8_string)
+    else:
+        raise TypeError("Argument must be bytes or unicode, got '%.200s'" % type(s).__name__)
+    if not valid:
+        raise ValueError(
+            "All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters")
+    return utf8_string
+
+
+cdef bytes _utf8orNone(object s):
+    return _utf8(s) if s is not None else None
+
+
+cdef enum:
+    NO_FILE_PATH = 0
+    ABS_UNIX_FILE_PATH = 1
+    ABS_WIN_FILE_PATH = 2
+    REL_FILE_PATH = 3
+
+
+cdef bint _isFilePath(const_xmlChar* c_path) noexcept:
+    "simple heuristic to see if a path is a filename"
+    cdef xmlChar c
+    # test if it looks like an absolute Unix path or a Windows network path
+    if c_path[0] == c'/':
+        return ABS_UNIX_FILE_PATH
+
+    # test if it looks like an absolute Windows path or URL
+    if c'a' <= c_path[0] <= c'z' or c'A' <= c_path[0] <= c'Z':
+        c_path += 1
+        if c_path[0] == c':' and c_path[1] in b'\0\\':
+            return ABS_WIN_FILE_PATH  # C: or C:\...
+
+        # test if it looks like a URL with scheme://
+        while c'a' <= c_path[0] <= c'z' or c'A' <= c_path[0] <= c'Z':
+            c_path += 1
+        if c_path[0] == c':' and c_path[1] == c'/' and c_path[2] == c'/':
+            return NO_FILE_PATH
+
+    # assume it's a relative path
+    return REL_FILE_PATH
+
+
+cdef object _getFSPathOrObject(object obj):
+    """
+    Get the __fspath__ attribute of an object if it exists.
+    Otherwise, the original object is returned.
+    """
+    if _isString(obj):
+        return obj
+    try:
+        return python.PyOS_FSPath(obj)
+    except TypeError:
+        return obj
+
+
+cdef object _encodeFilename(object filename):
+    """Make sure a filename is 8-bit encoded (or None).
+    """
+    if filename is None:
+        return None
+    elif isinstance(filename, bytes):
+        return filename
+    elif isinstance(filename, unicode):
+        filename8 = (<unicode>filename).encode('utf8')
+        if _isFilePath(<unsigned char*>filename8):
+            try:
+                return python.PyUnicode_AsEncodedString(
+                    filename, _C_FILENAME_ENCODING, NULL)
+            except UnicodeEncodeError:
+                pass
+        return filename8
+    else:
+        raise TypeError("Argument must be string or unicode.")
+
+cdef object _decodeFilename(const_xmlChar* c_path):
+    """Make the filename a unicode string if we are in Py3.
+    """
+    return _decodeFilenameWithLength(c_path, tree.xmlStrlen(c_path))
+
+cdef object _decodeFilenameWithLength(const_xmlChar* c_path, size_t c_len):
+    """Make the filename a unicode string if we are in Py3.
+    """
+    if _isFilePath(c_path):
+        try:
+            return python.PyUnicode_Decode(
+                <const_char*>c_path, c_len, _C_FILENAME_ENCODING, NULL)
+        except UnicodeDecodeError:
+            pass
+    try:
+        return (<unsigned char*>c_path)[:c_len].decode('UTF-8')
+    except UnicodeDecodeError:
+        # this is a stupid fallback, but it might still work...
+        return (<unsigned char*>c_path)[:c_len].decode('latin-1', 'replace')
+
+cdef object _encodeFilenameUTF8(object filename):
+    """Recode filename as UTF-8. Tries ASCII, local filesystem encoding and
+    UTF-8 as source encoding.
+    """
+    cdef char* c_filename
+    if filename is None:
+        return None
+    elif isinstance(filename, bytes):
+        if not isutf8l(<bytes>filename, len(<bytes>filename)):
+            # plain ASCII!
+            return filename
+        c_filename = _cstr(<bytes>filename)
+        try:
+            # try to decode with default encoding
+            filename = python.PyUnicode_Decode(
+                c_filename, len(<bytes>filename),
+                _C_FILENAME_ENCODING, NULL)
+        except UnicodeDecodeError as decode_exc:
+            try:
+                # try if it's proper UTF-8
+                (<bytes>filename).decode('utf8')
+                return filename
+            except UnicodeDecodeError:
+                raise decode_exc # otherwise re-raise original exception
+    if isinstance(filename, unicode):
+        return (<unicode>filename).encode('utf8')
+    else:
+        raise TypeError("Argument must be string or unicode.")
+
+cdef tuple _getNsTag(tag):
+    """Given a tag, find namespace URI and tag name.
+    Return None for NS uri if no namespace URI provided.
+    """
+    return __getNsTag(tag, 0)
+
+cdef tuple _getNsTagWithEmptyNs(tag):
+    """Given a tag, find namespace URI and tag name.  Return None for NS uri
+    if no namespace URI provided, or the empty string if namespace
+    part is '{}'.
+    """
+    return __getNsTag(tag, 1)
+
+cdef tuple __getNsTag(tag, bint empty_ns):
+    cdef char* c_tag
+    cdef char* c_ns_end
+    cdef Py_ssize_t taglen
+    cdef Py_ssize_t nslen
+    cdef bytes ns = None
+    # _isString() is much faster than isinstance()
+    if not _isString(tag) and isinstance(tag, QName):
+        tag = (<QName>tag).text
+    tag = _utf8(tag)
+    c_tag = _cstr(tag)
+    if c_tag[0] == c'{':
+        c_tag += 1
+        c_ns_end = cstring_h.strchr(c_tag, c'}')
+        if c_ns_end is NULL:
+            raise ValueError, "Invalid tag name"
+        nslen  = c_ns_end - c_tag
+        taglen = python.PyBytes_GET_SIZE(tag) - nslen - 2
+        if taglen == 0:
+            raise ValueError, "Empty tag name"
+        if nslen > 0:
+            ns = <bytes>c_tag[:nslen]
+        elif empty_ns:
+            ns = b''
+        tag = <bytes>c_ns_end[1:taglen+1]
+    elif python.PyBytes_GET_SIZE(tag) == 0:
+        raise ValueError, "Empty tag name"
+    return ns, tag
+
+cdef inline int _pyXmlNameIsValid(name_utf8):
+    return _xmlNameIsValid(_xcstr(name_utf8)) and b':' not in name_utf8
+
+cdef inline int _pyHtmlNameIsValid(name_utf8):
+    return _htmlNameIsValid(_xcstr(name_utf8))
+
+cdef inline int _xmlNameIsValid(const_xmlChar* c_name) noexcept:
+    return tree.xmlValidateNameValue(c_name)
+
+cdef int _htmlNameIsValid(const_xmlChar* c_name) noexcept:
+    if c_name is NULL or c_name[0] == c'\0':
+        return 0
+    while c_name[0] != c'\0':
+        if c_name[0] in b'&<>/"\'\t\n\x0B\x0C\r ':
+            return 0
+        c_name += 1
+    return 1
+
+cdef bint _characterReferenceIsValid(const_xmlChar* c_name) noexcept:
+    cdef bint is_hex
+    if c_name[0] == c'x':
+        c_name += 1
+        is_hex = 1
+    else:
+        is_hex = 0
+    if c_name[0] == c'\0':
+        return 0
+    while c_name[0] != c'\0':
+        if c_name[0] < c'0' or c_name[0] > c'9':
+            if not is_hex:
+                return 0
+            if not (c'a' <= c_name[0] <= c'f'):
+                if not (c'A' <= c_name[0] <= c'F'):
+                    return 0
+        c_name += 1
+    return 1
+
+cdef int _tagValidOrRaise(tag_utf) except -1:
+    if not _pyXmlNameIsValid(tag_utf):
+        raise ValueError(f"Invalid tag name {(<bytes>tag_utf).decode('utf8')!r}")
+    return 0
+
+cdef int _htmlTagValidOrRaise(tag_utf) except -1:
+    if not _pyHtmlNameIsValid(tag_utf):
+        raise ValueError(f"Invalid HTML tag name {(<bytes>tag_utf).decode('utf8')!r}")
+    return 0
+
+cdef int _attributeValidOrRaise(name_utf) except -1:
+    if not _pyXmlNameIsValid(name_utf):
+        raise ValueError(f"Invalid attribute name {(<bytes>name_utf).decode('utf8')!r}")
+    return 0
+
+cdef int _prefixValidOrRaise(tag_utf) except -1:
+    if not _pyXmlNameIsValid(tag_utf):
+        raise ValueError(f"Invalid namespace prefix {(<bytes>tag_utf).decode('utf8')!r}")
+    return 0
+
+cdef int _uriValidOrRaise(uri_utf) except -1:
+    cdef uri.xmlURI* c_uri = uri.xmlParseURI(_cstr(uri_utf))
+    if c_uri is NULL:
+        raise ValueError(f"Invalid namespace URI {(<bytes>uri_utf).decode('utf8')!r}")
+    uri.xmlFreeURI(c_uri)
+    return 0
+
+cdef inline unicode _namespacedName(xmlNode* c_node):
+    return _namespacedNameFromNsName(_getNs(c_node), c_node.name)
+
+
+cdef unicode _namespacedNameFromNsName(const_xmlChar* c_href, const_xmlChar* c_name):
+    name = funicode(c_name)
+    if c_href is NULL:
+        return name
+    href = funicode(c_href)
+    return f"{{{href}}}{name}"
+
+
+cdef _getFilenameForFile(source):
+    """Given a Python File or Gzip object, give filename back.
+
+    Returns None if not a file object.
+    """
+    # urllib2 provides a geturl() method
+    try:
+        return source.geturl()
+    except:
+        pass
+    # file instances have a name attribute
+    try:
+        filename = source.name
+        if _isString(filename):
+            return os_path_abspath(filename)
+    except:
+        pass
+    # gzip file instances have a filename attribute (before Py3k)
+    try:
+        filename = source.filename
+        if _isString(filename):
+            return os_path_abspath(filename)
+    except:
+        pass
+    # can't determine filename
+    return None

llmeval-env/lib/python3.10/site-packages/lxml/classlookup.pxi

@@ -0,0 +1,580 @@
+# Configurable Element class lookup
+
+################################################################################
+# Custom Element classes
+
+cdef public class ElementBase(_Element) [ type LxmlElementBaseType,
+                                          object LxmlElementBase ]:
+    """ElementBase(*children, attrib=None, nsmap=None, **_extra)
+
+    The public Element class.  All custom Element classes must inherit
+    from this one.  To create an Element, use the `Element()` factory.
+
+    BIG FAT WARNING: Subclasses *must not* override __init__ or
+    __new__ as it is absolutely undefined when these objects will be
+    created or destroyed.  All persistent state of Elements must be
+    stored in the underlying XML.  If you really need to initialize
+    the object after creation, you can implement an ``_init(self)``
+    method that will be called directly after object creation.
+
+    Subclasses of this class can be instantiated to create a new
+    Element.  By default, the tag name will be the class name and the
+    namespace will be empty.  You can modify this with the following
+    class attributes:
+
+    * TAG - the tag name, possibly containing a namespace in Clark
+      notation
+
+    * NAMESPACE - the default namespace URI, unless provided as part
+      of the TAG attribute.
+
+    * HTML - flag if the class is an HTML tag, as opposed to an XML
+      tag.  This only applies to un-namespaced tags and defaults to
+      false (i.e. XML).
+
+    * PARSER - the parser that provides the configuration for the
+      newly created document.  Providing an HTML parser here will
+      default to creating an HTML element.
+
+    In user code, the latter three are commonly inherited in class
+    hierarchies that implement a common namespace.
+    """
+    def __init__(self, *children, attrib=None, nsmap=None, **_extra):
+        """ElementBase(*children, attrib=None, nsmap=None, **_extra)
+        """
+        cdef bint is_html = 0
+        cdef _BaseParser parser
+        cdef _Element last_child
+        # don't use normal attribute access as it might be overridden
+        _getattr = object.__getattribute__
+        try:
+            namespace = _utf8(_getattr(self, 'NAMESPACE'))
+        except AttributeError:
+            namespace = None
+        try:
+            ns, tag = _getNsTag(_getattr(self, 'TAG'))
+            if ns is not None:
+                namespace = ns
+        except AttributeError:
+            tag = _utf8(_getattr(_getattr(self, '__class__'), '__name__'))
+            if b'.' in tag:
+                tag = tag.split(b'.')[-1]
+        try:
+            parser = _getattr(self, 'PARSER')
+        except AttributeError:
+            parser = None
+            for child in children:
+                if isinstance(child, _Element):
+                    parser = (<_Element>child)._doc._parser
+                    break
+        if isinstance(parser, HTMLParser):
+            is_html = 1
+        if namespace is None:
+            try:
+                is_html = _getattr(self, 'HTML')
+            except AttributeError:
+                pass
+        _initNewElement(self, is_html, tag, namespace, parser,
+                        attrib, nsmap, _extra)
+        last_child = None
+        for child in children:
+            if _isString(child):
+                if last_child is None:
+                    _setNodeText(self._c_node,
+                                 (_collectText(self._c_node.children) or '') + child)
+                else:
+                    _setTailText(last_child._c_node,
+                                 (_collectText(last_child._c_node.next) or '') + child)
+            elif isinstance(child, _Element):
+                last_child = child
+                _appendChild(self, last_child)
+            elif isinstance(child, type) and issubclass(child, ElementBase):
+                last_child = child()
+                _appendChild(self, last_child)
+            else:
+                raise TypeError, f"Invalid child type: {type(child)!r}"
+
+cdef class CommentBase(_Comment):
+    """All custom Comment classes must inherit from this one.
+
+    To create an XML Comment instance, use the ``Comment()`` factory.
+
+    Subclasses *must not* override __init__ or __new__ as it is
+    absolutely undefined when these objects will be created or
+    destroyed.  All persistent state of Comments must be stored in the
+    underlying XML.  If you really need to initialize the object after
+    creation, you can implement an ``_init(self)`` method that will be
+    called after object creation.
+    """
+    def __init__(self, text):
+        # copied from Comment() factory
+        cdef _Document doc
+        cdef xmlDoc*   c_doc
+        if text is None:
+            text = b''
+        else:
+            text = _utf8(text)
+        c_doc = _newXMLDoc()
+        doc = _documentFactory(c_doc, None)
+        self._c_node = _createComment(c_doc, _xcstr(text))
+        if self._c_node is NULL:
+            raise MemoryError()
+        tree.xmlAddChild(<xmlNode*>c_doc, self._c_node)
+        _registerProxy(self, doc, self._c_node)
+        self._init()
+
+cdef class PIBase(_ProcessingInstruction):
+    """All custom Processing Instruction classes must inherit from this one.
+
+    To create an XML ProcessingInstruction instance, use the ``PI()``
+    factory.
+
+    Subclasses *must not* override __init__ or __new__ as it is
+    absolutely undefined when these objects will be created or
+    destroyed.  All persistent state of PIs must be stored in the
+    underlying XML.  If you really need to initialize the object after
+    creation, you can implement an ``_init(self)`` method that will be
+    called after object creation.
+    """
+    def __init__(self, target, text=None):
+        # copied from PI() factory
+        cdef _Document doc
+        cdef xmlDoc*   c_doc
+        target = _utf8(target)
+        if text is None:
+            text = b''
+        else:
+            text = _utf8(text)
+        c_doc = _newXMLDoc()
+        doc = _documentFactory(c_doc, None)
+        self._c_node = _createPI(c_doc, _xcstr(target), _xcstr(text))
+        if self._c_node is NULL:
+            raise MemoryError()
+        tree.xmlAddChild(<xmlNode*>c_doc, self._c_node)
+        _registerProxy(self, doc, self._c_node)
+        self._init()
+
+cdef class EntityBase(_Entity):
+    """All custom Entity classes must inherit from this one.
+
+    To create an XML Entity instance, use the ``Entity()`` factory.
+
+    Subclasses *must not* override __init__ or __new__ as it is
+    absolutely undefined when these objects will be created or
+    destroyed.  All persistent state of Entities must be stored in the
+    underlying XML.  If you really need to initialize the object after
+    creation, you can implement an ``_init(self)`` method that will be
+    called after object creation.
+    """
+    def __init__(self, name):
+        cdef _Document doc
+        cdef xmlDoc*   c_doc
+        name_utf = _utf8(name)
+        c_name = _xcstr(name_utf)
+        if c_name[0] == c'#':
+            if not _characterReferenceIsValid(c_name + 1):
+                raise ValueError, f"Invalid character reference: '{name}'"
+        elif not _xmlNameIsValid(c_name):
+            raise ValueError, f"Invalid entity reference: '{name}'"
+        c_doc = _newXMLDoc()
+        doc = _documentFactory(c_doc, None)
+        self._c_node = _createEntity(c_doc, c_name)
+        if self._c_node is NULL:
+            raise MemoryError()
+        tree.xmlAddChild(<xmlNode*>c_doc, self._c_node)
+        _registerProxy(self, doc, self._c_node)
+        self._init()
+
+
+cdef int _validateNodeClass(xmlNode* c_node, cls) except -1:
+    if c_node.type == tree.XML_ELEMENT_NODE:
+        expected = ElementBase
+    elif c_node.type == tree.XML_COMMENT_NODE:
+        expected = CommentBase
+    elif c_node.type == tree.XML_ENTITY_REF_NODE:
+        expected = EntityBase
+    elif c_node.type == tree.XML_PI_NODE:
+        expected = PIBase
+    else:
+        assert False, f"Unknown node type: {c_node.type}"
+
+    if not (isinstance(cls, type) and issubclass(cls, expected)):
+        raise TypeError(
+            f"result of class lookup must be subclass of {type(expected)}, got {type(cls)}")
+    return 0
+
+
+################################################################################
+# Element class lookup
+
+ctypedef public object (*_element_class_lookup_function)(object, _Document, xmlNode*)
+
+# class to store element class lookup functions
+cdef public class ElementClassLookup [ type LxmlElementClassLookupType,
+                                       object LxmlElementClassLookup ]:
+    """ElementClassLookup(self)
+    Superclass of Element class lookups.
+    """
+    cdef _element_class_lookup_function _lookup_function
+
+
+cdef public class FallbackElementClassLookup(ElementClassLookup) \
+         [ type LxmlFallbackElementClassLookupType,
+           object LxmlFallbackElementClassLookup ]:
+    """FallbackElementClassLookup(self, fallback=None)
+
+    Superclass of Element class lookups with additional fallback.
+    """
+    cdef readonly ElementClassLookup fallback
+    cdef _element_class_lookup_function _fallback_function
+    def __cinit__(self):
+        # fall back to default lookup
+        self._fallback_function = _lookupDefaultElementClass
+
+    def __init__(self, ElementClassLookup fallback=None):
+        if fallback is not None:
+            self._setFallback(fallback)
+        else:
+            self._fallback_function = _lookupDefaultElementClass
+
+    cdef void _setFallback(self, ElementClassLookup lookup):
+        """Sets the fallback scheme for this lookup method.
+        """
+        self.fallback = lookup
+        self._fallback_function = lookup._lookup_function
+        if self._fallback_function is NULL:
+            self._fallback_function = _lookupDefaultElementClass
+
+    def set_fallback(self, ElementClassLookup lookup not None):
+        """set_fallback(self, lookup)
+
+        Sets the fallback scheme for this lookup method.
+        """
+        self._setFallback(lookup)
+
+cdef inline object _callLookupFallback(FallbackElementClassLookup lookup,
+                                       _Document doc, xmlNode* c_node):
+    return lookup._fallback_function(lookup.fallback, doc, c_node)
+
+
+################################################################################
+# default lookup scheme
+
+cdef class ElementDefaultClassLookup(ElementClassLookup):
+    """ElementDefaultClassLookup(self, element=None, comment=None, pi=None, entity=None)
+    Element class lookup scheme that always returns the default Element
+    class.
+
+    The keyword arguments ``element``, ``comment``, ``pi`` and ``entity``
+    accept the respective Element classes.
+    """
+    cdef readonly object element_class
+    cdef readonly object comment_class
+    cdef readonly object pi_class
+    cdef readonly object entity_class
+    def __cinit__(self):
+        self._lookup_function = _lookupDefaultElementClass
+
+    def __init__(self, element=None, comment=None, pi=None, entity=None):
+        if element is None:
+            self.element_class = _Element
+        elif issubclass(element, ElementBase):
+            self.element_class = element
+        else:
+            raise TypeError, "element class must be subclass of ElementBase"
+
+        if comment is None:
+            self.comment_class = _Comment
+        elif issubclass(comment, CommentBase):
+            self.comment_class = comment
+        else:
+            raise TypeError, "comment class must be subclass of CommentBase"
+
+        if entity is None:
+            self.entity_class = _Entity
+        elif issubclass(entity, EntityBase):
+            self.entity_class = entity
+        else:
+            raise TypeError, "Entity class must be subclass of EntityBase"
+
+        if pi is None:
+            self.pi_class = None # special case, see below
+        elif issubclass(pi, PIBase):
+            self.pi_class = pi
+        else:
+            raise TypeError, "PI class must be subclass of PIBase"
+
+cdef object _lookupDefaultElementClass(state, _Document _doc, xmlNode* c_node):
+    "Trivial class lookup function that always returns the default class."
+    if c_node.type == tree.XML_ELEMENT_NODE:
+        if state is not None:
+            return (<ElementDefaultClassLookup>state).element_class
+        else:
+            return _Element
+    elif c_node.type == tree.XML_COMMENT_NODE:
+        if state is not None:
+            return (<ElementDefaultClassLookup>state).comment_class
+        else:
+            return _Comment
+    elif c_node.type == tree.XML_ENTITY_REF_NODE:
+        if state is not None:
+            return (<ElementDefaultClassLookup>state).entity_class
+        else:
+            return _Entity
+    elif c_node.type == tree.XML_PI_NODE:
+        if state is None or (<ElementDefaultClassLookup>state).pi_class is None:
+            # special case XSLT-PI
+            if c_node.name is not NULL and c_node.content is not NULL:
+                if tree.xmlStrcmp(c_node.name, <unsigned char*>"xml-stylesheet") == 0:
+                    if tree.xmlStrstr(c_node.content, <unsigned char*>"text/xsl") is not NULL or \
+                           tree.xmlStrstr(c_node.content, <unsigned char*>"text/xml") is not NULL:
+                        return _XSLTProcessingInstruction
+            return _ProcessingInstruction
+        else:
+            return (<ElementDefaultClassLookup>state).pi_class
+    else:
+        assert False, f"Unknown node type: {c_node.type}"
+
+
+################################################################################
+# attribute based lookup scheme
+
+cdef class AttributeBasedElementClassLookup(FallbackElementClassLookup):
+    """AttributeBasedElementClassLookup(self, attribute_name, class_mapping, fallback=None)
+    Checks an attribute of an Element and looks up the value in a
+    class dictionary.
+
+    Arguments:
+      - attribute name - '{ns}name' style string
+      - class mapping  - Python dict mapping attribute values to Element classes
+      - fallback       - optional fallback lookup mechanism
+
+    A None key in the class mapping will be checked if the attribute is
+    missing.
+    """
+    cdef object _class_mapping
+    cdef tuple _pytag
+    cdef const_xmlChar* _c_ns
+    cdef const_xmlChar* _c_name
+    def __cinit__(self):
+        self._lookup_function = _attribute_class_lookup
+
+    def __init__(self, attribute_name, class_mapping,
+                 ElementClassLookup fallback=None):
+        self._pytag = _getNsTag(attribute_name)
+        ns, name = self._pytag
+        if ns is None:
+            self._c_ns = NULL
+        else:
+            self._c_ns = _xcstr(ns)
+        self._c_name = _xcstr(name)
+        self._class_mapping = dict(class_mapping)
+
+        FallbackElementClassLookup.__init__(self, fallback)
+
+cdef object _attribute_class_lookup(state, _Document doc, xmlNode* c_node):
+    cdef AttributeBasedElementClassLookup lookup
+    cdef python.PyObject* dict_result
+
+    lookup = <AttributeBasedElementClassLookup>state
+    if c_node.type == tree.XML_ELEMENT_NODE:
+        value = _attributeValueFromNsName(
+            c_node, lookup._c_ns, lookup._c_name)
+        dict_result = python.PyDict_GetItem(lookup._class_mapping, value)
+        if dict_result is not NULL:
+            cls = <object>dict_result
+            _validateNodeClass(c_node, cls)
+            return cls
+    return _callLookupFallback(lookup, doc, c_node)
+
+
+################################################################################
+#  per-parser lookup scheme
+
+cdef class ParserBasedElementClassLookup(FallbackElementClassLookup):
+    """ParserBasedElementClassLookup(self, fallback=None)
+    Element class lookup based on the XML parser.
+    """
+    def __cinit__(self):
+        self._lookup_function = _parser_class_lookup
+
+cdef object _parser_class_lookup(state, _Document doc, xmlNode* c_node):
+    if doc._parser._class_lookup is not None:
+        return doc._parser._class_lookup._lookup_function(
+            doc._parser._class_lookup, doc, c_node)
+    return _callLookupFallback(<FallbackElementClassLookup>state, doc, c_node)
+
+
+################################################################################
+#  custom class lookup based on node type, namespace, name
+
+cdef class CustomElementClassLookup(FallbackElementClassLookup):
+    """CustomElementClassLookup(self, fallback=None)
+    Element class lookup based on a subclass method.
+
+    You can inherit from this class and override the method::
+
+        lookup(self, type, doc, namespace, name)
+
+    to lookup the element class for a node. Arguments of the method:
+    * type:      one of 'element', 'comment', 'PI', 'entity'
+    * doc:       document that the node is in
+    * namespace: namespace URI of the node (or None for comments/PIs/entities)
+    * name:      name of the element/entity, None for comments, target for PIs
+
+    If you return None from this method, the fallback will be called.
+    """
+    def __cinit__(self):
+        self._lookup_function = _custom_class_lookup
+
+    def lookup(self, type, doc, namespace, name):
+        "lookup(self, type, doc, namespace, name)"
+        return None
+
+cdef object _custom_class_lookup(state, _Document doc, xmlNode* c_node):
+    cdef CustomElementClassLookup lookup
+
+    lookup = <CustomElementClassLookup>state
+
+    if c_node.type == tree.XML_ELEMENT_NODE:
+        element_type = "element"
+    elif c_node.type == tree.XML_COMMENT_NODE:
+        element_type = "comment"
+    elif c_node.type == tree.XML_PI_NODE:
+        element_type = "PI"
+    elif c_node.type == tree.XML_ENTITY_REF_NODE:
+        element_type = "entity"
+    else:
+        element_type = "element"
+    if c_node.name is NULL:
+        name = None
+    else:
+        name = funicode(c_node.name)
+    c_str = tree._getNs(c_node)
+    ns = funicode(c_str) if c_str is not NULL else None
+
+    cls = lookup.lookup(element_type, doc, ns, name)
+    if cls is not None:
+        _validateNodeClass(c_node, cls)
+        return cls
+    return _callLookupFallback(lookup, doc, c_node)
+
+
+################################################################################
+# read-only tree based class lookup
+
+cdef class PythonElementClassLookup(FallbackElementClassLookup):
+    """PythonElementClassLookup(self, fallback=None)
+    Element class lookup based on a subclass method.
+
+    This class lookup scheme allows access to the entire XML tree in
+    read-only mode.  To use it, re-implement the ``lookup(self, doc,
+    root)`` method in a subclass::
+
+        from lxml import etree, pyclasslookup
+
+        class MyElementClass(etree.ElementBase):
+            honkey = True
+
+        class MyLookup(pyclasslookup.PythonElementClassLookup):
+            def lookup(self, doc, root):
+                if root.tag == "sometag":
+                    return MyElementClass
+                else:
+                    for child in root:
+                        if child.tag == "someothertag":
+                            return MyElementClass
+                # delegate to default
+                return None
+
+    If you return None from this method, the fallback will be called.
+
+    The first argument is the opaque document instance that contains
+    the Element.  The second argument is a lightweight Element proxy
+    implementation that is only valid during the lookup.  Do not try
+    to keep a reference to it.  Once the lookup is done, the proxy
+    will be invalid.
+
+    Also, you cannot wrap such a read-only Element in an ElementTree,
+    and you must take care not to keep a reference to them outside of
+    the `lookup()` method.
+
+    Note that the API of the Element objects is not complete.  It is
+    purely read-only and does not support all features of the normal
+    `lxml.etree` API (such as XPath, extended slicing or some
+    iteration methods).
+
+    See https://lxml.de/element_classes.html
+    """
+    def __cinit__(self):
+        self._lookup_function = _python_class_lookup
+
+    def lookup(self, doc, element):
+        """lookup(self, doc, element)
+
+        Override this method to implement your own lookup scheme.
+        """
+        return None
+
+cdef object _python_class_lookup(state, _Document doc, tree.xmlNode* c_node):
+    cdef PythonElementClassLookup lookup
+    cdef _ReadOnlyProxy proxy
+    lookup = <PythonElementClassLookup>state
+
+    proxy = _newReadOnlyProxy(None, c_node)
+    cls = lookup.lookup(doc, proxy)
+    _freeReadOnlyProxies(proxy)
+
+    if cls is not None:
+        _validateNodeClass(c_node, cls)
+        return cls
+    return _callLookupFallback(lookup, doc, c_node)
+
+################################################################################
+# Global setup
+
+cdef _element_class_lookup_function LOOKUP_ELEMENT_CLASS
+cdef object ELEMENT_CLASS_LOOKUP_STATE
+
+cdef void _setElementClassLookupFunction(
+    _element_class_lookup_function function, object state):
+    global LOOKUP_ELEMENT_CLASS, ELEMENT_CLASS_LOOKUP_STATE
+    if function is NULL:
+        state    = DEFAULT_ELEMENT_CLASS_LOOKUP
+        function = DEFAULT_ELEMENT_CLASS_LOOKUP._lookup_function
+
+    ELEMENT_CLASS_LOOKUP_STATE = state
+    LOOKUP_ELEMENT_CLASS = function
+
+def set_element_class_lookup(ElementClassLookup lookup = None):
+    """set_element_class_lookup(lookup = None)
+
+    Set the global element class lookup method.
+
+    This defines the main entry point for looking up element implementations.
+    The standard implementation uses the :class:`ParserBasedElementClassLookup`
+    to delegate to different lookup schemes for each parser. 
+
+    .. warning::
+
+        This should only be changed by applications, not by library packages.
+        In most cases, parser specific lookups should be preferred,
+        which can be configured via
+        :meth:`~lxml.etree.XMLParser.set_element_class_lookup`
+        (and the same for HTML parsers).
+
+        Globally replacing the element class lookup by something other than a
+        :class:`ParserBasedElementClassLookup` will prevent parser specific lookup
+        schemes from working. Several tools rely on parser specific lookups,
+        including :mod:`lxml.html` and :mod:`lxml.objectify`.
+    """
+    if lookup is None or lookup._lookup_function is NULL:
+        _setElementClassLookupFunction(NULL, None)
+    else:
+        _setElementClassLookupFunction(lookup._lookup_function, lookup)
+
+# default setup: parser delegation
+cdef ParserBasedElementClassLookup DEFAULT_ELEMENT_CLASS_LOOKUP
+DEFAULT_ELEMENT_CLASS_LOOKUP = ParserBasedElementClassLookup()
+
+set_element_class_lookup(DEFAULT_ELEMENT_CLASS_LOOKUP)

llmeval-env/lib/python3.10/site-packages/lxml/cssselect.py

@@ -0,0 +1,101 @@
+"""CSS Selectors based on XPath.
+
+This module supports selecting XML/HTML tags based on CSS selectors.
+See the `CSSSelector` class for details.
+
+This is a thin wrapper around cssselect 0.7 or later.
+"""
+
+
+from . import etree
+try:
+    import cssselect as external_cssselect
+except ImportError:
+    raise ImportError(
+        'cssselect does not seem to be installed. '
+        'See https://pypi.org/project/cssselect/')
+
+
+SelectorSyntaxError = external_cssselect.SelectorSyntaxError
+ExpressionError = external_cssselect.ExpressionError
+SelectorError = external_cssselect.SelectorError
+
+
+__all__ = ['SelectorSyntaxError', 'ExpressionError', 'SelectorError',
+           'CSSSelector']
+
+
+class LxmlTranslator(external_cssselect.GenericTranslator):
+    """
+    A custom CSS selector to XPath translator with lxml-specific extensions.
+    """
+    def xpath_contains_function(self, xpath, function):
+        # Defined there, removed in later drafts:
+        # http://www.w3.org/TR/2001/CR-css3-selectors-20011113/#content-selectors
+        if function.argument_types() not in (['STRING'], ['IDENT']):
+            raise ExpressionError(
+                "Expected a single string or ident for :contains(), got %r"
+                % function.arguments)
+        value = function.arguments[0].value
+        return xpath.add_condition(
+            'contains(__lxml_internal_css:lower-case(string(.)), %s)'
+            % self.xpath_literal(value.lower()))
+
+
+class LxmlHTMLTranslator(LxmlTranslator, external_cssselect.HTMLTranslator):
+    """
+    lxml extensions + HTML support.
+    """
+
+
+def _make_lower_case(context, s):
+    return s.lower()
+
+ns = etree.FunctionNamespace('http://codespeak.net/lxml/css/')
+ns.prefix = '__lxml_internal_css'
+ns['lower-case'] = _make_lower_case
+
+
+class CSSSelector(etree.XPath):
+    """A CSS selector.
+
+    Usage::
+
+        >>> from lxml import etree, cssselect
+        >>> select = cssselect.CSSSelector("a tag > child")
+
+        >>> root = etree.XML("<a><b><c/><tag><child>TEXT</child></tag></b></a>")
+        >>> [ el.tag for el in select(root) ]
+        ['child']
+
+    To use CSS namespaces, you need to pass a prefix-to-namespace
+    mapping as ``namespaces`` keyword argument::
+
+        >>> rdfns = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
+        >>> select_ns = cssselect.CSSSelector('root > rdf|Description',
+        ...                                   namespaces={'rdf': rdfns})
+
+        >>> rdf = etree.XML((
+        ...     '<root xmlns:rdf="%s">'
+        ...       '<rdf:Description>blah</rdf:Description>'
+        ...     '</root>') % rdfns)
+        >>> [(el.tag, el.text) for el in select_ns(rdf)]
+        [('{http://www.w3.org/1999/02/22-rdf-syntax-ns#}Description', 'blah')]
+
+    """
+    def __init__(self, css, namespaces=None, translator='xml'):
+        if translator == 'xml':
+            translator = LxmlTranslator()
+        elif translator == 'html':
+            translator = LxmlHTMLTranslator()
+        elif translator == 'xhtml':
+            translator = LxmlHTMLTranslator(xhtml=True)
+        path = translator.css_to_xpath(css)
+        super().__init__(path, namespaces=namespaces)
+        self.css = css
+
+    def __repr__(self):
+        return '<%s %x for %r>' % (
+            self.__class__.__name__,
+            abs(id(self)),
+            self.css)

llmeval-env/lib/python3.10/site-packages/lxml/etree.h

@@ -0,0 +1,248 @@
+/* Generated by Cython 3.0.10 */
+
+#ifndef __PYX_HAVE__lxml__etree
+#define __PYX_HAVE__lxml__etree
+
+#include "Python.h"
+struct LxmlDocument;
+struct LxmlElement;
+struct LxmlElementTree;
+struct LxmlElementTagMatcher;
+struct LxmlElementIterator;
+struct LxmlElementBase;
+struct LxmlElementClassLookup;
+struct LxmlFallbackElementClassLookup;
+
+/* "lxml/etree.pyx":333
+ * 
+ * # type of a function that steps from node to node
+ * ctypedef public xmlNode* (*_node_to_node_function)(xmlNode*)             # <<<<<<<<<<<<<<
+ * 
+ * 
+ */
+typedef xmlNode *(*_node_to_node_function)(xmlNode *);
+
+/* "lxml/etree.pyx":349
+ * @cython.final
+ * @cython.freelist(8)
+ * cdef public class _Document [ type LxmlDocumentType, object LxmlDocument ]:             # <<<<<<<<<<<<<<
+ *     """Internal base class to reference a libxml document.
+ * 
+ */
+struct LxmlDocument {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_4lxml_5etree__Document *__pyx_vtab;
+  int _ns_counter;
+  PyObject *_prefix_tail;
+  xmlDoc *_c_doc;
+  struct __pyx_obj_4lxml_5etree__BaseParser *_parser;
+};
+
+/* "lxml/etree.pyx":698
+ * 
+ * @cython.no_gc_clear
+ * cdef public class _Element [ type LxmlElementType, object LxmlElement ]:             # <<<<<<<<<<<<<<
+ *     """Element class.
+ * 
+ */
+struct LxmlElement {
+  PyObject_HEAD
+  struct LxmlDocument *_doc;
+  xmlNode *_c_node;
+  PyObject *_tag;
+};
+
+/* "lxml/etree.pyx":1872
+ * 
+ * 
+ * cdef public class _ElementTree [ type LxmlElementTreeType,             # <<<<<<<<<<<<<<
+ *                                  object LxmlElementTree ]:
+ *     cdef _Document _doc
+ */
+struct LxmlElementTree {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_4lxml_5etree__ElementTree *__pyx_vtab;
+  struct LxmlDocument *_doc;
+  struct LxmlElement *_context_node;
+};
+
+/* "lxml/etree.pyx":2646
+ * 
+ * 
+ * cdef public class _ElementTagMatcher [ object LxmlElementTagMatcher,             # <<<<<<<<<<<<<<
+ *                                        type LxmlElementTagMatcherType ]:
+ *     """
+ */
+struct LxmlElementTagMatcher {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_4lxml_5etree__ElementTagMatcher *__pyx_vtab;
+  PyObject *_pystrings;
+  int _node_type;
+  char *_href;
+  char *_name;
+};
+
+/* "lxml/etree.pyx":2677
+ *                 self._name = NULL
+ * 
+ * cdef public class _ElementIterator(_ElementTagMatcher) [             # <<<<<<<<<<<<<<
+ *     object LxmlElementIterator, type LxmlElementIteratorType ]:
+ *     """
+ */
+struct LxmlElementIterator {
+  struct LxmlElementTagMatcher __pyx_base;
+  struct LxmlElement *_node;
+  _node_to_node_function _next_element;
+};
+
+/* "src/lxml/classlookup.pxi":6
+ * # Custom Element classes
+ * 
+ * cdef public class ElementBase(_Element) [ type LxmlElementBaseType,             # <<<<<<<<<<<<<<
+ *                                           object LxmlElementBase ]:
+ *     """ElementBase(*children, attrib=None, nsmap=None, **_extra)
+ */
+struct LxmlElementBase {
+  struct LxmlElement __pyx_base;
+};
+
+/* "src/lxml/classlookup.pxi":210
+ * # Element class lookup
+ * 
+ * ctypedef public object (*_element_class_lookup_function)(object, _Document, xmlNode*)             # <<<<<<<<<<<<<<
+ * 
+ * # class to store element class lookup functions
+ */
+typedef PyObject *(*_element_class_lookup_function)(PyObject *, struct LxmlDocument *, xmlNode *);
+
+/* "src/lxml/classlookup.pxi":213
+ * 
+ * # class to store element class lookup functions
+ * cdef public class ElementClassLookup [ type LxmlElementClassLookupType,             # <<<<<<<<<<<<<<
+ *                                        object LxmlElementClassLookup ]:
+ *     """ElementClassLookup(self)
+ */
+struct LxmlElementClassLookup {
+  PyObject_HEAD
+  _element_class_lookup_function _lookup_function;
+};
+
+/* "src/lxml/classlookup.pxi":221
+ * 
+ * 
+ * cdef public class FallbackElementClassLookup(ElementClassLookup) \             # <<<<<<<<<<<<<<
+ *          [ type LxmlFallbackElementClassLookupType,
+ *            object LxmlFallbackElementClassLookup ]:
+ */
+struct LxmlFallbackElementClassLookup {
+  struct LxmlElementClassLookup __pyx_base;
+  struct __pyx_vtabstruct_4lxml_5etree_FallbackElementClassLookup *__pyx_vtab;
+  struct LxmlElementClassLookup *fallback;
+  _element_class_lookup_function _fallback_function;
+};
+
+#ifndef __PYX_HAVE_API__lxml__etree
+
+#ifdef CYTHON_EXTERN_C
+    #undef __PYX_EXTERN_C
+    #define __PYX_EXTERN_C CYTHON_EXTERN_C
+#elif defined(__PYX_EXTERN_C)
+    #ifdef _MSC_VER
+    #pragma message ("Please do not define the '__PYX_EXTERN_C' macro externally. Use 'CYTHON_EXTERN_C' instead.")
+    #else
+    #warning Please do not define the '__PYX_EXTERN_C' macro externally. Use 'CYTHON_EXTERN_C' instead.
+    #endif
+#else
+  #ifdef __cplusplus
+    #define __PYX_EXTERN_C extern "C"
+  #else
+    #define __PYX_EXTERN_C extern
+  #endif
+#endif
+
+#ifndef DL_IMPORT
+  #define DL_IMPORT(_T) _T
+#endif
+
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlDocumentType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementTreeType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementTagMatcherType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementIteratorType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementBaseType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementClassLookupType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlFallbackElementClassLookupType;
+
+__PYX_EXTERN_C struct LxmlElement *deepcopyNodeToDocument(struct LxmlDocument *, xmlNode *);
+__PYX_EXTERN_C struct LxmlElementTree *elementTreeFactory(struct LxmlElement *);
+__PYX_EXTERN_C struct LxmlElementTree *newElementTree(struct LxmlElement *, PyObject *);
+__PYX_EXTERN_C struct LxmlElementTree *adoptExternalDocument(xmlDoc *, PyObject *, int);
+__PYX_EXTERN_C struct LxmlElement *elementFactory(struct LxmlDocument *, xmlNode *);
+__PYX_EXTERN_C struct LxmlElement *makeElement(PyObject *, struct LxmlDocument *, PyObject *, PyObject *, PyObject *, PyObject *, PyObject *);
+__PYX_EXTERN_C struct LxmlElement *makeSubElement(struct LxmlElement *, PyObject *, PyObject *, PyObject *, PyObject *, PyObject *);
+__PYX_EXTERN_C void setElementClassLookupFunction(_element_class_lookup_function, PyObject *);
+__PYX_EXTERN_C PyObject *lookupDefaultElementClass(PyObject *, PyObject *, xmlNode *);
+__PYX_EXTERN_C PyObject *lookupNamespaceElementClass(PyObject *, PyObject *, xmlNode *);
+__PYX_EXTERN_C PyObject *callLookupFallback(struct LxmlFallbackElementClassLookup *, struct LxmlDocument *, xmlNode *);
+__PYX_EXTERN_C int tagMatches(xmlNode *, const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C struct LxmlDocument *documentOrRaise(PyObject *);
+__PYX_EXTERN_C struct LxmlElement *rootNodeOrRaise(PyObject *);
+__PYX_EXTERN_C int hasText(xmlNode *);
+__PYX_EXTERN_C int hasTail(xmlNode *);
+__PYX_EXTERN_C PyObject *textOf(xmlNode *);
+__PYX_EXTERN_C PyObject *tailOf(xmlNode *);
+__PYX_EXTERN_C int setNodeText(xmlNode *, PyObject *);
+__PYX_EXTERN_C int setTailText(xmlNode *, PyObject *);
+__PYX_EXTERN_C PyObject *attributeValue(xmlNode *, xmlAttr *);
+__PYX_EXTERN_C PyObject *attributeValueFromNsName(xmlNode *, const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C PyObject *getAttributeValue(struct LxmlElement *, PyObject *, PyObject *);
+__PYX_EXTERN_C PyObject *iterattributes(struct LxmlElement *, int);
+__PYX_EXTERN_C PyObject *collectAttributes(xmlNode *, int);
+__PYX_EXTERN_C int setAttributeValue(struct LxmlElement *, PyObject *, PyObject *);
+__PYX_EXTERN_C int delAttribute(struct LxmlElement *, PyObject *);
+__PYX_EXTERN_C int delAttributeFromNsName(xmlNode *, const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C int hasChild(xmlNode *);
+__PYX_EXTERN_C xmlNode *findChild(xmlNode *, Py_ssize_t);
+__PYX_EXTERN_C xmlNode *findChildForwards(xmlNode *, Py_ssize_t);
+__PYX_EXTERN_C xmlNode *findChildBackwards(xmlNode *, Py_ssize_t);
+__PYX_EXTERN_C xmlNode *nextElement(xmlNode *);
+__PYX_EXTERN_C xmlNode *previousElement(xmlNode *);
+__PYX_EXTERN_C void appendChild(struct LxmlElement *, struct LxmlElement *);
+__PYX_EXTERN_C int appendChildToElement(struct LxmlElement *, struct LxmlElement *);
+__PYX_EXTERN_C PyObject *pyunicode(const xmlChar *);
+__PYX_EXTERN_C PyObject *utf8(PyObject *);
+__PYX_EXTERN_C PyObject *getNsTag(PyObject *);
+__PYX_EXTERN_C PyObject *getNsTagWithEmptyNs(PyObject *);
+__PYX_EXTERN_C PyObject *namespacedName(xmlNode *);
+__PYX_EXTERN_C PyObject *namespacedNameFromNsName(const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C void iteratorStoreNext(struct LxmlElementIterator *, struct LxmlElement *);
+__PYX_EXTERN_C void initTagMatch(struct LxmlElementTagMatcher *, PyObject *);
+__PYX_EXTERN_C xmlNs *findOrBuildNodeNsPrefix(struct LxmlDocument *, xmlNode *, const xmlChar *, const xmlChar *);
+
+#endif /* !__PYX_HAVE_API__lxml__etree */
+
+/* WARNING: the interface of the module init function changed in CPython 3.5. */
+/* It now returns a PyModuleDef instance instead of a PyModule instance. */
+
+#if PY_MAJOR_VERSION < 3
+PyMODINIT_FUNC initetree(void);
+#else
+/* WARNING: Use PyImport_AppendInittab("etree", PyInit_etree) instead of calling PyInit_etree directly from Python 3.5 */
+PyMODINIT_FUNC PyInit_etree(void);
+
+#if PY_VERSION_HEX >= 0x03050000 && (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER) || (defined(__cplusplus) && __cplusplus >= 201402L))
+#if defined(__cplusplus) && __cplusplus >= 201402L
+[[deprecated("Use PyImport_AppendInittab(\"etree\", PyInit_etree) instead of calling PyInit_etree directly.")]] inline
+#elif defined(__GNUC__) || defined(__clang__)
+__attribute__ ((__deprecated__("Use PyImport_AppendInittab(\"etree\", PyInit_etree) instead of calling PyInit_etree directly."), __unused__)) __inline__
+#elif defined(_MSC_VER)
+__declspec(deprecated("Use PyImport_AppendInittab(\"etree\", PyInit_etree) instead of calling PyInit_etree directly.")) __inline
+#endif
+static PyObject* __PYX_WARN_IF_PyInit_etree_INIT_CALLED(PyObject* res) {
+  return res;
+}
+#define PyInit_etree() __PYX_WARN_IF_PyInit_etree_INIT_CALLED(PyInit_etree())
+#endif
+#endif
+
+#endif /* !__PYX_HAVE__lxml__etree */

llmeval-env/lib/python3.10/site-packages/lxml/extensions.pxi

@@ -0,0 +1,833 @@
+# support for extension functions in XPath and XSLT
+
+cdef class XPathError(LxmlError):
+    """Base class of all XPath errors.
+    """
+
+cdef class XPathEvalError(XPathError):
+    """Error during XPath evaluation.
+    """
+
+cdef class XPathFunctionError(XPathEvalError):
+    """Internal error looking up an XPath extension function.
+    """
+
+cdef class XPathResultError(XPathEvalError):
+    """Error handling an XPath result.
+    """
+
+
+# forward declarations
+
+ctypedef int (*_register_function)(void* ctxt, name_utf, ns_uri_utf)
+cdef class _ExsltRegExp
+
+################################################################################
+# Base class for XSLT and XPath evaluation contexts: functions, namespaces, ...
+
+@cython.internal
+cdef class _BaseContext:
+    cdef xpath.xmlXPathContext* _xpathCtxt
+    cdef _Document _doc
+    cdef dict _extensions
+    cdef list _namespaces
+    cdef list _global_namespaces
+    cdef dict _utf_refs
+    cdef dict _function_cache
+    cdef dict _eval_context_dict
+    cdef bint _build_smart_strings
+    # for exception handling and temporary reference keeping:
+    cdef _TempStore _temp_refs
+    cdef set _temp_documents
+    cdef _ExceptionContext _exc
+    cdef _ErrorLog _error_log
+
+    def __cinit__(self):
+        self._xpathCtxt = NULL
+
+    def __init__(self, namespaces, extensions, error_log, enable_regexp,
+                 build_smart_strings):
+        cdef _ExsltRegExp _regexp 
+        cdef dict new_extensions
+        cdef list ns
+        self._utf_refs = {}
+        self._global_namespaces = []
+        self._function_cache = {}
+        self._eval_context_dict = None
+        self._error_log = error_log
+
+        if extensions is not None:
+            # convert extensions to UTF-8
+            if isinstance(extensions, dict):
+                extensions = (extensions,)
+            # format: [ {(ns, name):function} ] -> {(ns_utf, name_utf):function}
+            new_extensions = {}
+            for extension in extensions:
+                for (ns_uri, name), function in extension.items():
+                    if name is None:
+                        raise ValueError, "extensions must have non empty names"
+                    ns_utf   = self._to_utf(ns_uri)
+                    name_utf = self._to_utf(name)
+                    new_extensions[(ns_utf, name_utf)] = function
+            extensions = new_extensions or None
+
+        if namespaces is not None:
+            if isinstance(namespaces, dict):
+                namespaces = namespaces.items()
+            if namespaces:
+                ns = []
+                for prefix, ns_uri in namespaces:
+                    if prefix is None or not prefix:
+                        raise TypeError, \
+                            "empty namespace prefix is not supported in XPath"
+                    if ns_uri is None or not ns_uri:
+                        raise TypeError, \
+                            "setting default namespace is not supported in XPath"
+                    prefix_utf = self._to_utf(prefix)
+                    ns_uri_utf = self._to_utf(ns_uri)
+                    ns.append( (prefix_utf, ns_uri_utf) )
+                namespaces = ns
+            else:
+                namespaces = None
+
+        self._doc        = None
+        self._exc        = _ExceptionContext()
+        self._extensions = extensions
+        self._namespaces = namespaces
+        self._temp_refs  = _TempStore()
+        self._temp_documents  = set()
+        self._build_smart_strings = build_smart_strings
+
+        if enable_regexp:
+            _regexp = _ExsltRegExp()
+            _regexp._register_in_context(self)
+
+    cdef _BaseContext _copy(self):
+        cdef _BaseContext context
+        if self._namespaces is not None:
+            namespaces = self._namespaces[:]
+        else:
+            namespaces = None
+        context = self.__class__(namespaces, None, self._error_log, False,
+                                 self._build_smart_strings)
+        if self._extensions is not None:
+            context._extensions = self._extensions.copy()
+        return context
+
+    cdef bytes _to_utf(self, s):
+        "Convert to UTF-8 and keep a reference to the encoded string"
+        cdef python.PyObject* dict_result
+        if s is None:
+            return None
+        dict_result = python.PyDict_GetItem(self._utf_refs, s)
+        if dict_result is not NULL:
+            return <bytes>dict_result
+        utf = _utf8(s)
+        self._utf_refs[s] = utf
+        if python.IS_PYPY:
+            # use C level refs, PyPy refs are not enough!
+            python.Py_INCREF(utf)
+        return utf
+
+    cdef void _set_xpath_context(self, xpath.xmlXPathContext* xpathCtxt) noexcept:
+        self._xpathCtxt = xpathCtxt
+        xpathCtxt.userData = <void*>self
+        # Need a cast here because older libxml2 releases do not use 'const' in the functype.
+        xpathCtxt.error = <xmlerror.xmlStructuredErrorFunc> _receiveXPathError
+
+    @cython.final
+    cdef _register_context(self, _Document doc):
+        self._doc = doc
+        self._exc.clear()
+
+    @cython.final
+    cdef _cleanup_context(self):
+        #xpath.xmlXPathRegisteredNsCleanup(self._xpathCtxt)
+        #self.unregisterGlobalNamespaces()
+        if python.IS_PYPY:
+            # clean up double refs in PyPy (see "_to_utf()" method)
+            for ref in self._utf_refs.itervalues():
+                python.Py_DECREF(ref)
+        self._utf_refs.clear()
+        self._eval_context_dict = None
+        self._doc = None
+
+    @cython.final
+    cdef _release_context(self):
+        if self._xpathCtxt is not NULL:
+            self._xpathCtxt.userData = NULL
+            self._xpathCtxt = NULL
+
+    # namespaces (internal UTF-8 methods with leading '_')
+
+    cdef addNamespace(self, prefix, ns_uri):
+        cdef list namespaces
+        if prefix is None:
+            raise TypeError, "empty prefix is not supported in XPath"
+        prefix_utf = self._to_utf(prefix)
+        ns_uri_utf = self._to_utf(ns_uri)
+        new_item = (prefix_utf, ns_uri_utf)
+        if self._namespaces is None:
+            self._namespaces = [new_item]
+        else:
+            namespaces = []
+            for item in self._namespaces:
+                if item[0] == prefix_utf:
+                    item = new_item
+                    new_item = None
+                namespaces.append(item)
+            if new_item is not None:
+                namespaces.append(new_item)
+            self._namespaces = namespaces
+        if self._xpathCtxt is not NULL:
+            xpath.xmlXPathRegisterNs(
+                self._xpathCtxt, _xcstr(prefix_utf), _xcstr(ns_uri_utf))
+
+    cdef registerNamespace(self, prefix, ns_uri):
+        if prefix is None:
+            raise TypeError, "empty prefix is not supported in XPath"
+        prefix_utf = self._to_utf(prefix)
+        ns_uri_utf = self._to_utf(ns_uri)
+        self._global_namespaces.append(prefix_utf)
+        xpath.xmlXPathRegisterNs(self._xpathCtxt,
+                                 _xcstr(prefix_utf), _xcstr(ns_uri_utf))
+
+    cdef registerLocalNamespaces(self):
+        if self._namespaces is None:
+            return
+        for prefix_utf, ns_uri_utf in self._namespaces:
+            xpath.xmlXPathRegisterNs(
+                self._xpathCtxt, _xcstr(prefix_utf), _xcstr(ns_uri_utf))
+
+    cdef registerGlobalNamespaces(self):
+        cdef list ns_prefixes = _find_all_extension_prefixes()
+        if python.PyList_GET_SIZE(ns_prefixes) > 0:
+            for prefix_utf, ns_uri_utf in ns_prefixes:
+                self._global_namespaces.append(prefix_utf)
+                xpath.xmlXPathRegisterNs(
+                    self._xpathCtxt, _xcstr(prefix_utf), _xcstr(ns_uri_utf))
+
+    cdef unregisterGlobalNamespaces(self):
+        if python.PyList_GET_SIZE(self._global_namespaces) > 0:
+            for prefix_utf in self._global_namespaces:
+                xpath.xmlXPathRegisterNs(self._xpathCtxt,
+                                         _xcstr(prefix_utf), NULL)
+            del self._global_namespaces[:]
+    
+    cdef void _unregisterNamespace(self, prefix_utf) noexcept:
+        xpath.xmlXPathRegisterNs(self._xpathCtxt,
+                                 _xcstr(prefix_utf), NULL)
+    
+    # extension functions
+
+    cdef int _addLocalExtensionFunction(self, ns_utf, name_utf, function) except -1:
+        if self._extensions is None:
+            self._extensions = {}
+        self._extensions[(ns_utf, name_utf)] = function
+        return 0
+
+    cdef registerGlobalFunctions(self, void* ctxt,
+                                 _register_function reg_func):
+        cdef python.PyObject* dict_result
+        cdef dict d
+        for ns_utf, ns_functions in __FUNCTION_NAMESPACE_REGISTRIES.iteritems():
+            dict_result = python.PyDict_GetItem(
+                self._function_cache, ns_utf)
+            if dict_result is not NULL:
+                d = <dict>dict_result
+            else:
+                d = {}
+                self._function_cache[ns_utf] = d
+            for name_utf, function in ns_functions.iteritems():
+                d[name_utf] = function
+                reg_func(ctxt, name_utf, ns_utf)
+
+    cdef registerLocalFunctions(self, void* ctxt,
+                                _register_function reg_func):
+        cdef python.PyObject* dict_result
+        cdef dict d
+        if self._extensions is None:
+            return # done
+        last_ns = None
+        d = None
+        for (ns_utf, name_utf), function in self._extensions.iteritems():
+            if ns_utf is not last_ns or d is None:
+                last_ns = ns_utf
+                dict_result = python.PyDict_GetItem(
+                    self._function_cache, ns_utf)
+                if dict_result is not NULL:
+                    d = <dict>dict_result
+                else:
+                    d = {}
+                    self._function_cache[ns_utf] = d
+            d[name_utf] = function
+            reg_func(ctxt, name_utf, ns_utf)
+
+    cdef unregisterAllFunctions(self, void* ctxt,
+                                      _register_function unreg_func):
+        for ns_utf, functions in self._function_cache.iteritems():
+            for name_utf in functions:
+                unreg_func(ctxt, name_utf, ns_utf)
+
+    cdef unregisterGlobalFunctions(self, void* ctxt,
+                                         _register_function unreg_func):
+        for ns_utf, functions in self._function_cache.items():
+            for name_utf in functions:
+                if self._extensions is None or \
+                       (ns_utf, name_utf) not in self._extensions:
+                    unreg_func(ctxt, name_utf, ns_utf)
+
+    @cython.final
+    cdef _find_cached_function(self, const_xmlChar* c_ns_uri, const_xmlChar* c_name):
+        """Lookup an extension function in the cache and return it.
+
+        Parameters: c_ns_uri may be NULL, c_name must not be NULL
+        """
+        cdef python.PyObject* c_dict
+        cdef python.PyObject* dict_result
+        c_dict = python.PyDict_GetItem(
+            self._function_cache, None if c_ns_uri is NULL else c_ns_uri)
+        if c_dict is not NULL:
+            dict_result = python.PyDict_GetItem(
+                <object>c_dict, <unsigned char*>c_name)
+            if dict_result is not NULL:
+                return <object>dict_result
+        return None
+
+    # Python access to the XPath context for extension functions
+
+    @property
+    def context_node(self):
+        cdef xmlNode* c_node
+        if self._xpathCtxt is NULL:
+            raise XPathError, \
+                "XPath context is only usable during the evaluation"
+        c_node = self._xpathCtxt.node
+        if c_node is NULL:
+            raise XPathError, "no context node"
+        if c_node.doc != self._xpathCtxt.doc:
+            raise XPathError, \
+                "document-external context nodes are not supported"
+        if self._doc is None:
+            raise XPathError, "document context is missing"
+        return _elementFactory(self._doc, c_node)
+
+    @property
+    def eval_context(self):
+        if self._eval_context_dict is None:
+            self._eval_context_dict = {}
+        return self._eval_context_dict
+
+    # Python reference keeping during XPath function evaluation
+
+    @cython.final
+    cdef _release_temp_refs(self):
+        "Free temporarily referenced objects from this context."
+        self._temp_refs.clear()
+        self._temp_documents.clear()
+
+    @cython.final
+    cdef _hold(self, obj):
+        """A way to temporarily hold references to nodes in the evaluator.
+
+        This is needed because otherwise nodes created in XPath extension
+        functions would be reference counted too soon, during the XPath
+        evaluation.  This is most important in the case of exceptions.
+        """
+        cdef _Element element
+        if isinstance(obj, _Element):
+            self._temp_refs.add(obj)
+            self._temp_documents.add((<_Element>obj)._doc)
+            return
+        elif _isString(obj) or not python.PySequence_Check(obj):
+            return
+        for o in obj:
+            if isinstance(o, _Element):
+                #print "Holding element:", <int>element._c_node
+                self._temp_refs.add(o)
+                #print "Holding document:", <int>element._doc._c_doc
+                self._temp_documents.add((<_Element>o)._doc)
+
+    @cython.final
+    cdef _Document _findDocumentForNode(self, xmlNode* c_node):
+        """If an XPath expression returns an element from a different
+        document than the current context document, we call this to
+        see if it was possibly created by an extension and is a known
+        document instance.
+        """
+        cdef _Document doc
+        for doc in self._temp_documents:
+            if doc is not None and doc._c_doc is c_node.doc:
+                return doc
+        return None
+
+
+# libxml2 keeps these error messages in a static array in its code
+# and doesn't give us access to them ...
+
+cdef tuple LIBXML2_XPATH_ERROR_MESSAGES = (
+    b"Ok",
+    b"Number encoding",
+    b"Unfinished literal",
+    b"Start of literal",
+    b"Expected $ for variable reference",
+    b"Undefined variable",
+    b"Invalid predicate",
+    b"Invalid expression",
+    b"Missing closing curly brace",
+    b"Unregistered function",
+    b"Invalid operand",
+    b"Invalid type",
+    b"Invalid number of arguments",
+    b"Invalid context size",
+    b"Invalid context position",
+    b"Memory allocation error",
+    b"Syntax error",
+    b"Resource error",
+    b"Sub resource error",
+    b"Undefined namespace prefix",
+    b"Encoding error",
+    b"Char out of XML range",
+    b"Invalid or incomplete context",
+    b"Stack usage error",
+    b"Forbidden variable\n",
+    b"?? Unknown error ??\n",
+)
+
+cdef void _forwardXPathError(void* c_ctxt, const xmlerror.xmlError* c_error) noexcept with gil:
+    cdef xmlerror.xmlError error
+    cdef int xpath_code
+    if c_error.message is not NULL:
+        error.message = c_error.message
+    else:
+        xpath_code = c_error.code - xmlerror.XML_XPATH_EXPRESSION_OK
+        if 0 <= xpath_code < len(LIBXML2_XPATH_ERROR_MESSAGES):
+            error.message = _cstr(LIBXML2_XPATH_ERROR_MESSAGES[xpath_code])
+        else:
+            error.message = b"unknown error"
+    error.domain = c_error.domain
+    error.code = c_error.code
+    error.level = c_error.level
+    error.line = c_error.line
+    error.int2 = c_error.int1 # column
+    error.file = c_error.file
+    error.node = NULL
+
+    (<_BaseContext>c_ctxt)._error_log._receive(&error)
+
+cdef void _receiveXPathError(void* c_context, const xmlerror.xmlError* error) noexcept nogil:
+    if not __DEBUG:
+        return
+    if c_context is NULL:
+        _forwardError(NULL, error)
+    else:
+        _forwardXPathError(c_context, error)
+
+
+def Extension(module, function_mapping=None, *, ns=None):
+    """Extension(module, function_mapping=None, ns=None)
+
+    Build a dictionary of extension functions from the functions
+    defined in a module or the methods of an object.
+
+    As second argument, you can pass an additional mapping of
+    attribute names to XPath function names, or a list of function
+    names that should be taken.
+
+    The ``ns`` keyword argument accepts a namespace URI for the XPath
+    functions.
+    """
+    cdef dict functions = {}
+    if isinstance(function_mapping, dict):
+        for function_name, xpath_name in function_mapping.items():
+            functions[(ns, xpath_name)] = getattr(module, function_name)
+    else:
+        if function_mapping is None:
+            function_mapping = [ name for name in dir(module)
+                                 if not name.startswith('_') ]
+        for function_name in function_mapping:
+            functions[(ns, function_name)] = getattr(module, function_name)
+    return functions
+
+################################################################################
+# EXSLT regexp implementation
+
+@cython.final
+@cython.internal
+cdef class _ExsltRegExp:
+    cdef dict _compile_map
+    def __cinit__(self):
+        self._compile_map = {}
+
+    cdef _make_string(self, value):
+        if _isString(value):
+            return value
+        elif isinstance(value, list):
+            # node set: take recursive text concatenation of first element
+            if python.PyList_GET_SIZE(value) == 0:
+                return ''
+            firstnode = value[0]
+            if _isString(firstnode):
+                return firstnode
+            elif isinstance(firstnode, _Element):
+                c_text = tree.xmlNodeGetContent((<_Element>firstnode)._c_node)
+                if c_text is NULL:
+                    raise MemoryError()
+                try:
+                    return funicode(c_text)
+                finally:
+                    tree.xmlFree(c_text)
+            else:
+                return unicode(firstnode)
+        else:
+            return unicode(value)
+
+    cdef _compile(self, rexp, ignore_case):
+        cdef python.PyObject* c_result
+        rexp = self._make_string(rexp)
+        key = (rexp, ignore_case)
+        c_result = python.PyDict_GetItem(self._compile_map, key)
+        if c_result is not NULL:
+            return <object>c_result
+        py_flags = re.UNICODE
+        if ignore_case:
+            py_flags = py_flags | re.IGNORECASE
+        rexp_compiled = re.compile(rexp, py_flags)
+        self._compile_map[key] = rexp_compiled
+        return rexp_compiled
+
+    def test(self, ctxt, s, rexp, flags=''):
+        flags = self._make_string(flags)
+        s = self._make_string(s)
+        rexpc = self._compile(rexp, 'i' in flags)
+        if rexpc.search(s) is None:
+            return False
+        else:
+            return True
+
+    def match(self, ctxt, s, rexp, flags=''):
+        cdef list result_list
+        flags = self._make_string(flags)
+        s = self._make_string(s)
+        rexpc = self._compile(rexp, 'i' in flags)
+        if 'g' in flags:
+            results = rexpc.findall(s)
+            if not results:
+                return ()
+        else:
+            result = rexpc.search(s)
+            if not result:
+                return ()
+            results = [ result.group() ]
+            results.extend( result.groups('') )
+        result_list = []
+        root = Element('matches')
+        for s_match in results:
+            if python.PyTuple_CheckExact(s_match):
+                s_match = ''.join(s_match)
+            elem = SubElement(root, 'match')
+            elem.text = s_match
+            result_list.append(elem)
+        return result_list
+
+    def replace(self, ctxt, s, rexp, flags, replacement):
+        replacement = self._make_string(replacement)
+        flags = self._make_string(flags)
+        s = self._make_string(s)
+        rexpc = self._compile(rexp, 'i' in flags)
+        count: object = 0 if 'g' in flags else 1
+        return rexpc.sub(replacement, s, count)
+
+    cdef _register_in_context(self, _BaseContext context):
+        ns = b"http://exslt.org/regular-expressions"
+        context._addLocalExtensionFunction(ns, b"test",    self.test)
+        context._addLocalExtensionFunction(ns, b"match",   self.match)
+        context._addLocalExtensionFunction(ns, b"replace", self.replace)
+
+
+################################################################################
+# helper functions
+
+cdef xpath.xmlXPathObject* _wrapXPathObject(object obj, _Document doc,
+                                            _BaseContext context) except NULL:
+    cdef xpath.xmlNodeSet* resultSet
+    cdef _Element fake_node = None
+    cdef xmlNode* c_node
+
+    if isinstance(obj, unicode):
+        obj = _utf8(obj)
+    if isinstance(obj, bytes):
+        # libxml2 copies the string value
+        return xpath.xmlXPathNewCString(_cstr(obj))
+    if isinstance(obj, bool):
+        return xpath.xmlXPathNewBoolean(obj)
+    if python.PyNumber_Check(obj):
+        return xpath.xmlXPathNewFloat(obj)
+    if obj is None:
+        resultSet = xpath.xmlXPathNodeSetCreate(NULL)
+    elif isinstance(obj, _Element):
+        resultSet = xpath.xmlXPathNodeSetCreate((<_Element>obj)._c_node)
+    elif python.PySequence_Check(obj):
+        resultSet = xpath.xmlXPathNodeSetCreate(NULL)
+        try:
+            for value in obj:
+                if isinstance(value, _Element):
+                    if context is not None:
+                        context._hold(value)
+                    xpath.xmlXPathNodeSetAdd(resultSet, (<_Element>value)._c_node)
+                else:
+                    if context is None or doc is None:
+                        raise XPathResultError, \
+                              f"Non-Element values not supported at this point - got {value!r}"
+                    # support strings by appending text nodes to an Element
+                    if isinstance(value, unicode):
+                        value = _utf8(value)
+                    if isinstance(value, bytes):
+                        if fake_node is None:
+                            fake_node = _makeElement("text-root", NULL, doc, None,
+                                                     None, None, None, None, None)
+                            context._hold(fake_node)
+                        else:
+                            # append a comment node to keep the text nodes separate
+                            c_node = tree.xmlNewDocComment(doc._c_doc, <unsigned char*>"")
+                            if c_node is NULL:
+                                raise MemoryError()
+                            tree.xmlAddChild(fake_node._c_node, c_node)
+                        context._hold(value)
+                        c_node = tree.xmlNewDocText(doc._c_doc, _xcstr(value))
+                        if c_node is NULL:
+                            raise MemoryError()
+                        tree.xmlAddChild(fake_node._c_node, c_node)
+                        xpath.xmlXPathNodeSetAdd(resultSet, c_node)
+                    else:
+                        raise XPathResultError, \
+                              f"This is not a supported node-set result: {value!r}"
+        except:
+            xpath.xmlXPathFreeNodeSet(resultSet)
+            raise
+    else:
+        raise XPathResultError, f"Unknown return type: {python._fqtypename(obj).decode('utf8')}"
+    return xpath.xmlXPathWrapNodeSet(resultSet)
+
+cdef object _unwrapXPathObject(xpath.xmlXPathObject* xpathObj,
+                               _Document doc, _BaseContext context):
+    if xpathObj.type == xpath.XPATH_UNDEFINED:
+        raise XPathResultError, "Undefined xpath result"
+    elif xpathObj.type == xpath.XPATH_NODESET:
+        return _createNodeSetResult(xpathObj, doc, context)
+    elif xpathObj.type == xpath.XPATH_BOOLEAN:
+        return xpathObj.boolval
+    elif xpathObj.type == xpath.XPATH_NUMBER:
+        return xpathObj.floatval
+    elif xpathObj.type == xpath.XPATH_STRING:
+        stringval = funicode(xpathObj.stringval)
+        if context._build_smart_strings:
+            stringval = _elementStringResultFactory(
+                stringval, None, None, False)
+        return stringval
+    elif xpathObj.type == xpath.XPATH_POINT:
+        raise NotImplementedError, "XPATH_POINT"
+    elif xpathObj.type == xpath.XPATH_RANGE:
+        raise NotImplementedError, "XPATH_RANGE"
+    elif xpathObj.type == xpath.XPATH_LOCATIONSET:
+        raise NotImplementedError, "XPATH_LOCATIONSET"
+    elif xpathObj.type == xpath.XPATH_USERS:
+        raise NotImplementedError, "XPATH_USERS"
+    elif xpathObj.type == xpath.XPATH_XSLT_TREE:
+        return _createNodeSetResult(xpathObj, doc, context)
+    else:
+        raise XPathResultError, f"Unknown xpath result {xpathObj.type}"
+
+cdef object _createNodeSetResult(xpath.xmlXPathObject* xpathObj, _Document doc,
+                                 _BaseContext context):
+    cdef xmlNode* c_node
+    cdef int i
+    cdef list result
+    result = []
+    if xpathObj.nodesetval is NULL:
+        return result
+    for i in range(xpathObj.nodesetval.nodeNr):
+        c_node = xpathObj.nodesetval.nodeTab[i]
+        _unpackNodeSetEntry(result, c_node, doc, context,
+                            xpathObj.type == xpath.XPATH_XSLT_TREE)
+    return result
+
+cdef _unpackNodeSetEntry(list results, xmlNode* c_node, _Document doc,
+                         _BaseContext context, bint is_fragment):
+    cdef xmlNode* c_child
+    if _isElement(c_node):
+        if c_node.doc != doc._c_doc and c_node.doc._private is NULL:
+            # XXX: works, but maybe not always the right thing to do?
+            # XPath: only runs when extensions create or copy trees
+            #        -> we store Python refs to these, so that is OK
+            # XSLT: can it leak when merging trees from multiple sources?
+            c_node = tree.xmlDocCopyNode(c_node, doc._c_doc, 1)
+            # FIXME: call _instantiateElementFromXPath() instead?
+        results.append(
+            _fakeDocElementFactory(doc, c_node))
+    elif c_node.type == tree.XML_TEXT_NODE or \
+             c_node.type == tree.XML_CDATA_SECTION_NODE or \
+             c_node.type == tree.XML_ATTRIBUTE_NODE:
+        results.append(
+            _buildElementStringResult(doc, c_node, context))
+    elif c_node.type == tree.XML_NAMESPACE_DECL:
+        results.append( (funicodeOrNone((<xmlNs*>c_node).prefix),
+                         funicodeOrNone((<xmlNs*>c_node).href)) )
+    elif c_node.type == tree.XML_DOCUMENT_NODE or \
+            c_node.type == tree.XML_HTML_DOCUMENT_NODE:
+        # ignored for everything but result tree fragments
+        if is_fragment:
+            c_child = c_node.children
+            while c_child is not NULL:
+                _unpackNodeSetEntry(results, c_child, doc, context, 0)
+                c_child = c_child.next
+    elif c_node.type == tree.XML_XINCLUDE_START or \
+            c_node.type == tree.XML_XINCLUDE_END:
+        pass
+    else:
+        raise NotImplementedError, \
+            f"Not yet implemented result node type: {c_node.type}"
+
+cdef void _freeXPathObject(xpath.xmlXPathObject* xpathObj) noexcept:
+    """Free the XPath object, but *never* free the *content* of node sets.
+    Python dealloc will do that for us.
+    """
+    if xpathObj.nodesetval is not NULL:
+        xpath.xmlXPathFreeNodeSet(xpathObj.nodesetval)
+        xpathObj.nodesetval = NULL
+    xpath.xmlXPathFreeObject(xpathObj)
+
+cdef _Element _instantiateElementFromXPath(xmlNode* c_node, _Document doc,
+                                           _BaseContext context):
+    # NOTE: this may copy the element - only call this when it can't leak
+    if c_node.doc != doc._c_doc and c_node.doc._private is NULL:
+        # not from the context document and not from a fake document
+        # either => may still be from a known document, e.g. one
+        # created by an extension function
+        node_doc = context._findDocumentForNode(c_node)
+        if node_doc is None:
+            # not from a known document at all! => can only make a
+            # safety copy here
+            c_node = tree.xmlDocCopyNode(c_node, doc._c_doc, 1)
+        else:
+            doc = node_doc
+    return _fakeDocElementFactory(doc, c_node)
+
+################################################################################
+# special str/unicode subclasses
+
+@cython.final
+cdef class _ElementUnicodeResult(unicode):
+    cdef _Element _parent
+    cdef readonly object attrname
+    cdef readonly bint is_tail
+
+    def getparent(self):
+        return self._parent
+
+    @property
+    def is_text(self):
+        return self._parent is not None and not (self.is_tail or self.attrname is not None)
+
+    @property
+    def is_attribute(self):
+        return self.attrname is not None
+
+cdef object _elementStringResultFactory(string_value, _Element parent,
+                                        attrname, bint is_tail):
+    result = _ElementUnicodeResult(string_value)
+    result._parent = parent
+    result.is_tail = is_tail
+    result.attrname = attrname
+    return result
+
+cdef object _buildElementStringResult(_Document doc, xmlNode* c_node,
+                                      _BaseContext context):
+    cdef _Element parent = None
+    cdef object attrname = None
+    cdef xmlNode* c_element
+    cdef bint is_tail
+
+    if c_node.type == tree.XML_ATTRIBUTE_NODE:
+        attrname = _namespacedName(c_node)
+        is_tail = 0
+        s = tree.xmlNodeGetContent(c_node)
+        try:
+            value = funicode(s)
+        finally:
+            tree.xmlFree(s)
+        c_element = NULL
+    else:
+        #assert c_node.type == tree.XML_TEXT_NODE or c_node.type == tree.XML_CDATA_SECTION_NODE, "invalid node type"
+        # may be tail text or normal text
+        value = funicode(c_node.content)
+        c_element = _previousElement(c_node)
+        is_tail = c_element is not NULL
+
+    if not context._build_smart_strings:
+        return value
+
+    if c_element is NULL:
+        # non-tail text or attribute text
+        c_element = c_node.parent
+        while c_element is not NULL and not _isElement(c_element):
+            c_element = c_element.parent
+
+    if c_element is not NULL:
+        parent = _instantiateElementFromXPath(c_element, doc, context)
+
+    return _elementStringResultFactory(
+        value, parent, attrname, is_tail)
+
+################################################################################
+# callbacks for XPath/XSLT extension functions
+
+cdef void _extension_function_call(_BaseContext context, function,
+                                   xpath.xmlXPathParserContext* ctxt, int nargs) noexcept:
+    cdef _Document doc
+    cdef xpath.xmlXPathObject* obj
+    cdef list args
+    cdef int i
+    doc = context._doc
+    try:
+        args = []
+        for i in range(nargs):
+            obj = xpath.valuePop(ctxt)
+            o = _unwrapXPathObject(obj, doc, context)
+            _freeXPathObject(obj)
+            args.append(o)
+        args.reverse()
+
+        res = function(context, *args)
+        # wrap result for XPath consumption
+        obj = _wrapXPathObject(res, doc, context)
+        # prevent Python from deallocating elements handed to libxml2
+        context._hold(res)
+        xpath.valuePush(ctxt, obj)
+    except:
+        xpath.xmlXPathErr(ctxt, xpath.XPATH_EXPR_ERROR)
+        context._exc._store_raised()
+    finally:
+        return  # swallow any further exceptions
+
+# lookup the function by name and call it
+
+cdef void _xpath_function_call(xpath.xmlXPathParserContext* ctxt,
+                               int nargs) noexcept with gil:
+    cdef _BaseContext context
+    cdef xpath.xmlXPathContext* rctxt = ctxt.context
+    context = <_BaseContext> rctxt.userData
+    try:
+        function = context._find_cached_function(rctxt.functionURI, rctxt.function)
+        if function is not None:
+            _extension_function_call(context, function, ctxt, nargs)
+        else:
+            xpath.xmlXPathErr(ctxt, xpath.XPATH_UNKNOWN_FUNC_ERROR)
+            context._exc._store_exception(XPathFunctionError(
+                f"XPath function '{_namespacedNameFromNsName(rctxt.functionURI, rctxt.function)}' not found"))
+    except:
+        # may not be the right error, but we need to tell libxml2 *something*
+        xpath.xmlXPathErr(ctxt, xpath.XPATH_UNKNOWN_FUNC_ERROR)
+        context._exc._store_raised()
+    finally:
+        return  # swallow any further exceptions

llmeval-env/lib/python3.10/site-packages/lxml/lxml.etree.h

@@ -0,0 +1,248 @@
+/* Generated by Cython 3.0.10 */
+
+#ifndef __PYX_HAVE__lxml__etree
+#define __PYX_HAVE__lxml__etree
+
+#include "Python.h"
+struct LxmlDocument;
+struct LxmlElement;
+struct LxmlElementTree;
+struct LxmlElementTagMatcher;
+struct LxmlElementIterator;
+struct LxmlElementBase;
+struct LxmlElementClassLookup;
+struct LxmlFallbackElementClassLookup;
+
+/* "lxml/etree.pyx":333
+ * 
+ * # type of a function that steps from node to node
+ * ctypedef public xmlNode* (*_node_to_node_function)(xmlNode*)             # <<<<<<<<<<<<<<
+ * 
+ * 
+ */
+typedef xmlNode *(*_node_to_node_function)(xmlNode *);
+
+/* "lxml/etree.pyx":349
+ * @cython.final
+ * @cython.freelist(8)
+ * cdef public class _Document [ type LxmlDocumentType, object LxmlDocument ]:             # <<<<<<<<<<<<<<
+ *     """Internal base class to reference a libxml document.
+ * 
+ */
+struct LxmlDocument {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_4lxml_5etree__Document *__pyx_vtab;
+  int _ns_counter;
+  PyObject *_prefix_tail;
+  xmlDoc *_c_doc;
+  struct __pyx_obj_4lxml_5etree__BaseParser *_parser;
+};
+
+/* "lxml/etree.pyx":698
+ * 
+ * @cython.no_gc_clear
+ * cdef public class _Element [ type LxmlElementType, object LxmlElement ]:             # <<<<<<<<<<<<<<
+ *     """Element class.
+ * 
+ */
+struct LxmlElement {
+  PyObject_HEAD
+  struct LxmlDocument *_doc;
+  xmlNode *_c_node;
+  PyObject *_tag;
+};
+
+/* "lxml/etree.pyx":1872
+ * 
+ * 
+ * cdef public class _ElementTree [ type LxmlElementTreeType,             # <<<<<<<<<<<<<<
+ *                                  object LxmlElementTree ]:
+ *     cdef _Document _doc
+ */
+struct LxmlElementTree {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_4lxml_5etree__ElementTree *__pyx_vtab;
+  struct LxmlDocument *_doc;
+  struct LxmlElement *_context_node;
+};
+
+/* "lxml/etree.pyx":2646
+ * 
+ * 
+ * cdef public class _ElementTagMatcher [ object LxmlElementTagMatcher,             # <<<<<<<<<<<<<<
+ *                                        type LxmlElementTagMatcherType ]:
+ *     """
+ */
+struct LxmlElementTagMatcher {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_4lxml_5etree__ElementTagMatcher *__pyx_vtab;
+  PyObject *_pystrings;
+  int _node_type;
+  char *_href;
+  char *_name;
+};
+
+/* "lxml/etree.pyx":2677
+ *                 self._name = NULL
+ * 
+ * cdef public class _ElementIterator(_ElementTagMatcher) [             # <<<<<<<<<<<<<<
+ *     object LxmlElementIterator, type LxmlElementIteratorType ]:
+ *     """
+ */
+struct LxmlElementIterator {
+  struct LxmlElementTagMatcher __pyx_base;
+  struct LxmlElement *_node;
+  _node_to_node_function _next_element;
+};
+
+/* "src/lxml/classlookup.pxi":6
+ * # Custom Element classes
+ * 
+ * cdef public class ElementBase(_Element) [ type LxmlElementBaseType,             # <<<<<<<<<<<<<<
+ *                                           object LxmlElementBase ]:
+ *     """ElementBase(*children, attrib=None, nsmap=None, **_extra)
+ */
+struct LxmlElementBase {
+  struct LxmlElement __pyx_base;
+};
+
+/* "src/lxml/classlookup.pxi":210
+ * # Element class lookup
+ * 
+ * ctypedef public object (*_element_class_lookup_function)(object, _Document, xmlNode*)             # <<<<<<<<<<<<<<
+ * 
+ * # class to store element class lookup functions
+ */
+typedef PyObject *(*_element_class_lookup_function)(PyObject *, struct LxmlDocument *, xmlNode *);
+
+/* "src/lxml/classlookup.pxi":213
+ * 
+ * # class to store element class lookup functions
+ * cdef public class ElementClassLookup [ type LxmlElementClassLookupType,             # <<<<<<<<<<<<<<
+ *                                        object LxmlElementClassLookup ]:
+ *     """ElementClassLookup(self)
+ */
+struct LxmlElementClassLookup {
+  PyObject_HEAD
+  _element_class_lookup_function _lookup_function;
+};
+
+/* "src/lxml/classlookup.pxi":221
+ * 
+ * 
+ * cdef public class FallbackElementClassLookup(ElementClassLookup) \             # <<<<<<<<<<<<<<
+ *          [ type LxmlFallbackElementClassLookupType,
+ *            object LxmlFallbackElementClassLookup ]:
+ */
+struct LxmlFallbackElementClassLookup {
+  struct LxmlElementClassLookup __pyx_base;
+  struct __pyx_vtabstruct_4lxml_5etree_FallbackElementClassLookup *__pyx_vtab;
+  struct LxmlElementClassLookup *fallback;
+  _element_class_lookup_function _fallback_function;
+};
+
+#ifndef __PYX_HAVE_API__lxml__etree
+
+#ifdef CYTHON_EXTERN_C
+    #undef __PYX_EXTERN_C
+    #define __PYX_EXTERN_C CYTHON_EXTERN_C
+#elif defined(__PYX_EXTERN_C)
+    #ifdef _MSC_VER
+    #pragma message ("Please do not define the '__PYX_EXTERN_C' macro externally. Use 'CYTHON_EXTERN_C' instead.")
+    #else
+    #warning Please do not define the '__PYX_EXTERN_C' macro externally. Use 'CYTHON_EXTERN_C' instead.
+    #endif
+#else
+  #ifdef __cplusplus
+    #define __PYX_EXTERN_C extern "C"
+  #else
+    #define __PYX_EXTERN_C extern
+  #endif
+#endif
+
+#ifndef DL_IMPORT
+  #define DL_IMPORT(_T) _T
+#endif
+
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlDocumentType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementTreeType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementTagMatcherType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementIteratorType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementBaseType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlElementClassLookupType;
+__PYX_EXTERN_C DL_IMPORT(PyTypeObject) LxmlFallbackElementClassLookupType;
+
+__PYX_EXTERN_C struct LxmlElement *deepcopyNodeToDocument(struct LxmlDocument *, xmlNode *);
+__PYX_EXTERN_C struct LxmlElementTree *elementTreeFactory(struct LxmlElement *);
+__PYX_EXTERN_C struct LxmlElementTree *newElementTree(struct LxmlElement *, PyObject *);
+__PYX_EXTERN_C struct LxmlElementTree *adoptExternalDocument(xmlDoc *, PyObject *, int);
+__PYX_EXTERN_C struct LxmlElement *elementFactory(struct LxmlDocument *, xmlNode *);
+__PYX_EXTERN_C struct LxmlElement *makeElement(PyObject *, struct LxmlDocument *, PyObject *, PyObject *, PyObject *, PyObject *, PyObject *);
+__PYX_EXTERN_C struct LxmlElement *makeSubElement(struct LxmlElement *, PyObject *, PyObject *, PyObject *, PyObject *, PyObject *);
+__PYX_EXTERN_C void setElementClassLookupFunction(_element_class_lookup_function, PyObject *);
+__PYX_EXTERN_C PyObject *lookupDefaultElementClass(PyObject *, PyObject *, xmlNode *);
+__PYX_EXTERN_C PyObject *lookupNamespaceElementClass(PyObject *, PyObject *, xmlNode *);
+__PYX_EXTERN_C PyObject *callLookupFallback(struct LxmlFallbackElementClassLookup *, struct LxmlDocument *, xmlNode *);
+__PYX_EXTERN_C int tagMatches(xmlNode *, const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C struct LxmlDocument *documentOrRaise(PyObject *);
+__PYX_EXTERN_C struct LxmlElement *rootNodeOrRaise(PyObject *);
+__PYX_EXTERN_C int hasText(xmlNode *);
+__PYX_EXTERN_C int hasTail(xmlNode *);
+__PYX_EXTERN_C PyObject *textOf(xmlNode *);
+__PYX_EXTERN_C PyObject *tailOf(xmlNode *);
+__PYX_EXTERN_C int setNodeText(xmlNode *, PyObject *);
+__PYX_EXTERN_C int setTailText(xmlNode *, PyObject *);
+__PYX_EXTERN_C PyObject *attributeValue(xmlNode *, xmlAttr *);
+__PYX_EXTERN_C PyObject *attributeValueFromNsName(xmlNode *, const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C PyObject *getAttributeValue(struct LxmlElement *, PyObject *, PyObject *);
+__PYX_EXTERN_C PyObject *iterattributes(struct LxmlElement *, int);
+__PYX_EXTERN_C PyObject *collectAttributes(xmlNode *, int);
+__PYX_EXTERN_C int setAttributeValue(struct LxmlElement *, PyObject *, PyObject *);
+__PYX_EXTERN_C int delAttribute(struct LxmlElement *, PyObject *);
+__PYX_EXTERN_C int delAttributeFromNsName(xmlNode *, const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C int hasChild(xmlNode *);
+__PYX_EXTERN_C xmlNode *findChild(xmlNode *, Py_ssize_t);
+__PYX_EXTERN_C xmlNode *findChildForwards(xmlNode *, Py_ssize_t);
+__PYX_EXTERN_C xmlNode *findChildBackwards(xmlNode *, Py_ssize_t);
+__PYX_EXTERN_C xmlNode *nextElement(xmlNode *);
+__PYX_EXTERN_C xmlNode *previousElement(xmlNode *);
+__PYX_EXTERN_C void appendChild(struct LxmlElement *, struct LxmlElement *);
+__PYX_EXTERN_C int appendChildToElement(struct LxmlElement *, struct LxmlElement *);
+__PYX_EXTERN_C PyObject *pyunicode(const xmlChar *);
+__PYX_EXTERN_C PyObject *utf8(PyObject *);
+__PYX_EXTERN_C PyObject *getNsTag(PyObject *);
+__PYX_EXTERN_C PyObject *getNsTagWithEmptyNs(PyObject *);
+__PYX_EXTERN_C PyObject *namespacedName(xmlNode *);
+__PYX_EXTERN_C PyObject *namespacedNameFromNsName(const xmlChar *, const xmlChar *);
+__PYX_EXTERN_C void iteratorStoreNext(struct LxmlElementIterator *, struct LxmlElement *);
+__PYX_EXTERN_C void initTagMatch(struct LxmlElementTagMatcher *, PyObject *);
+__PYX_EXTERN_C xmlNs *findOrBuildNodeNsPrefix(struct LxmlDocument *, xmlNode *, const xmlChar *, const xmlChar *);
+
+#endif /* !__PYX_HAVE_API__lxml__etree */
+
+/* WARNING: the interface of the module init function changed in CPython 3.5. */
+/* It now returns a PyModuleDef instance instead of a PyModule instance. */
+
+#if PY_MAJOR_VERSION < 3
+PyMODINIT_FUNC initetree(void);
+#else
+/* WARNING: Use PyImport_AppendInittab("etree", PyInit_etree) instead of calling PyInit_etree directly from Python 3.5 */
+PyMODINIT_FUNC PyInit_etree(void);
+
+#if PY_VERSION_HEX >= 0x03050000 && (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER) || (defined(__cplusplus) && __cplusplus >= 201402L))
+#if defined(__cplusplus) && __cplusplus >= 201402L
+[[deprecated("Use PyImport_AppendInittab(\"etree\", PyInit_etree) instead of calling PyInit_etree directly.")]] inline
+#elif defined(__GNUC__) || defined(__clang__)
+__attribute__ ((__deprecated__("Use PyImport_AppendInittab(\"etree\", PyInit_etree) instead of calling PyInit_etree directly."), __unused__)) __inline__
+#elif defined(_MSC_VER)
+__declspec(deprecated("Use PyImport_AppendInittab(\"etree\", PyInit_etree) instead of calling PyInit_etree directly.")) __inline
+#endif
+static PyObject* __PYX_WARN_IF_PyInit_etree_INIT_CALLED(PyObject* res) {
+  return res;
+}
+#define PyInit_etree() __PYX_WARN_IF_PyInit_etree_INIT_CALLED(PyInit_etree())
+#endif
+#endif
+
+#endif /* !__PYX_HAVE__lxml__etree */

llmeval-env/lib/python3.10/site-packages/lxml/nsclasses.pxi

@@ -0,0 +1,281 @@
+# module-level API for namespace implementations
+
+cdef class LxmlRegistryError(LxmlError):
+    """Base class of lxml registry errors.
+    """
+
+cdef class NamespaceRegistryError(LxmlRegistryError):
+    """Error registering a namespace extension.
+    """
+
+
+@cython.internal
+cdef class _NamespaceRegistry:
+    "Dictionary-like namespace registry"
+    cdef object _ns_uri
+    cdef bytes _ns_uri_utf
+    cdef dict _entries
+    cdef char* _c_ns_uri_utf
+    def __cinit__(self, ns_uri):
+        self._ns_uri = ns_uri
+        if ns_uri is None:
+            self._ns_uri_utf = None
+            self._c_ns_uri_utf = NULL
+        else:
+            self._ns_uri_utf = _utf8(ns_uri)
+            self._c_ns_uri_utf = _cstr(self._ns_uri_utf)
+        self._entries = {}
+
+    def update(self, class_dict_iterable):
+        """update(self, class_dict_iterable)
+
+        Forgivingly update the registry.
+
+        ``class_dict_iterable`` may be a dict or some other iterable
+        that yields (name, value) pairs.
+
+        If a value does not match the required type for this registry,
+        or if the name starts with '_', it will be silently discarded.
+        This allows registrations at the module or class level using
+        vars(), globals() etc."""
+        if hasattr(class_dict_iterable, 'items'):
+            class_dict_iterable = class_dict_iterable.items()
+        for name, item in class_dict_iterable:
+            if (name is None or name[:1] != '_') and callable(item):
+                self[name] = item
+
+    def __getitem__(self, name):
+        if name is not None:
+            name = _utf8(name)
+        return self._get(name)
+
+    def __delitem__(self, name):
+        if name is not None:
+            name = _utf8(name)
+        del self._entries[name]
+
+    cdef object _get(self, object name):
+        cdef python.PyObject* dict_result
+        dict_result = python.PyDict_GetItem(self._entries, name)
+        if dict_result is NULL:
+            raise KeyError, "Name not registered."
+        return <object>dict_result
+
+    cdef object _getForString(self, char* name):
+        cdef python.PyObject* dict_result
+        dict_result = python.PyDict_GetItem(self._entries, name)
+        if dict_result is NULL:
+            raise KeyError, "Name not registered."
+        return <object>dict_result
+
+    def __iter__(self):
+        return iter(self._entries)
+
+    def items(self):
+        return list(self._entries.items())
+
+    def iteritems(self):
+        return iter(self._entries.items())
+
+    def clear(self):
+        self._entries.clear()
+
+    def __call__(self, obj):
+        # Usage as decorator:
+        #   ns = lookup.get_namespace("...")
+        #   @ns('abc')
+        #   class element(ElementBase): pass
+        #
+        #   @ns
+        #   class elementname(ElementBase): pass
+
+        if obj is None or python._isString(obj):
+            # @ns(None) or @ns('tag')
+            return partial(self.__deco, obj)
+        # plain @ns decorator
+        self[obj.__name__] = obj
+        return obj
+
+    def __deco(self, name, obj):
+        self[name] = obj
+        return obj
+
+
+@cython.final
+@cython.internal
+cdef class _ClassNamespaceRegistry(_NamespaceRegistry):
+    "Dictionary-like registry for namespace implementation classes"
+    def __setitem__(self, name, item):
+        if not isinstance(item, type) or not issubclass(item, ElementBase):
+            raise NamespaceRegistryError, \
+                "Registered element classes must be subtypes of ElementBase"
+        if name is not None:
+            name = _utf8(name)
+        self._entries[name] = item
+
+    def __repr__(self):
+        return "Namespace(%r)" % self._ns_uri
+
+
+cdef class ElementNamespaceClassLookup(FallbackElementClassLookup):
+    """ElementNamespaceClassLookup(self, fallback=None)
+
+    Element class lookup scheme that searches the Element class in the
+    Namespace registry.
+
+    Usage:
+
+    >>> lookup = ElementNamespaceClassLookup()
+    >>> ns_elements = lookup.get_namespace("http://schema.org/Movie")
+
+    >>> @ns_elements
+    ... class movie(ElementBase):
+    ...     "Element implementation for 'movie' tag (using class name) in schema namespace."
+
+    >>> @ns_elements("movie")
+    ... class MovieElement(ElementBase):
+    ...     "Element implementation for 'movie' tag (explicit tag name) in schema namespace."
+    """
+    cdef dict _namespace_registries
+    def __cinit__(self):
+        self._namespace_registries = {}
+
+    def __init__(self, ElementClassLookup fallback=None):
+        FallbackElementClassLookup.__init__(self, fallback)
+        self._lookup_function = _find_nselement_class
+
+    def get_namespace(self, ns_uri):
+        """get_namespace(self, ns_uri)
+
+        Retrieve the namespace object associated with the given URI.
+        Pass None for the empty namespace.
+
+        Creates a new namespace object if it does not yet exist."""
+        if ns_uri:
+            ns_utf = _utf8(ns_uri)
+        else:
+            ns_utf = None
+        try:
+            return self._namespace_registries[ns_utf]
+        except KeyError:
+            registry = self._namespace_registries[ns_utf] = \
+                       _ClassNamespaceRegistry(ns_uri)
+            return registry
+
+cdef object _find_nselement_class(state, _Document doc, xmlNode* c_node):
+    cdef python.PyObject* dict_result
+    cdef ElementNamespaceClassLookup lookup
+    cdef _NamespaceRegistry registry
+    if state is None:
+        return _lookupDefaultElementClass(None, doc, c_node)
+
+    lookup = <ElementNamespaceClassLookup>state
+    if c_node.type != tree.XML_ELEMENT_NODE:
+        return _callLookupFallback(lookup, doc, c_node)
+
+    c_namespace_utf = _getNs(c_node)
+    if c_namespace_utf is not NULL:
+        dict_result = python.PyDict_GetItem(
+            lookup._namespace_registries, <unsigned char*>c_namespace_utf)
+    else:
+        dict_result = python.PyDict_GetItem(
+            lookup._namespace_registries, None)
+    if dict_result is not NULL:
+        registry = <_NamespaceRegistry>dict_result
+        classes = registry._entries
+
+        if c_node.name is not NULL:
+            dict_result = python.PyDict_GetItem(
+                classes, <unsigned char*>c_node.name)
+        else:
+            dict_result = NULL
+
+        if dict_result is NULL:
+            dict_result = python.PyDict_GetItem(classes, None)
+
+        if dict_result is not NULL:
+            return <object>dict_result
+    return _callLookupFallback(lookup, doc, c_node)
+
+
+################################################################################
+# XPath extension functions
+
+cdef dict __FUNCTION_NAMESPACE_REGISTRIES
+__FUNCTION_NAMESPACE_REGISTRIES = {}
+
+def FunctionNamespace(ns_uri):
+    """FunctionNamespace(ns_uri)
+
+    Retrieve the function namespace object associated with the given
+    URI.
+
+    Creates a new one if it does not yet exist. A function namespace
+    can only be used to register extension functions.
+
+    Usage:
+
+    >>> ns_functions = FunctionNamespace("http://schema.org/Movie")
+
+    >>> @ns_functions  # uses function name
+    ... def add2(x):
+    ...     return x + 2
+
+    >>> @ns_functions("add3")  # uses explicit name
+    ... def add_three(x):
+    ...     return x + 3
+    """
+    ns_utf = _utf8(ns_uri) if ns_uri else None
+    try:
+        return __FUNCTION_NAMESPACE_REGISTRIES[ns_utf]
+    except KeyError:
+        registry = __FUNCTION_NAMESPACE_REGISTRIES[ns_utf] = \
+                   _XPathFunctionNamespaceRegistry(ns_uri)
+        return registry
+
+@cython.internal
+cdef class _FunctionNamespaceRegistry(_NamespaceRegistry):
+    def __setitem__(self, name, item):
+        if not callable(item):
+            raise NamespaceRegistryError, \
+                "Registered functions must be callable."
+        if not name:
+            raise ValueError, \
+                "extensions must have non empty names"
+        self._entries[_utf8(name)] = item
+
+    def __repr__(self):
+        return "FunctionNamespace(%r)" % self._ns_uri
+
+@cython.final
+@cython.internal
+cdef class _XPathFunctionNamespaceRegistry(_FunctionNamespaceRegistry):
+    cdef object _prefix
+    cdef bytes _prefix_utf
+
+    property prefix:
+        "Namespace prefix for extension functions."
+        def __del__(self):
+            self._prefix = None # no prefix configured
+            self._prefix_utf = None
+        def __get__(self):
+            if self._prefix is None:
+                return ''
+            else:
+                return self._prefix
+        def __set__(self, prefix):
+            if prefix == '':
+                prefix = None # empty prefix
+            self._prefix_utf = _utf8(prefix) if prefix is not None else None
+            self._prefix = prefix
+
+cdef list _find_all_extension_prefixes():
+    "Internal lookup function to find all function prefixes for XSLT/XPath."
+    cdef _XPathFunctionNamespaceRegistry registry
+    cdef list ns_prefixes = []
+    for registry in __FUNCTION_NAMESPACE_REGISTRIES.itervalues():
+        if registry._prefix_utf is not None:
+            if registry._ns_uri_utf is not None:
+                ns_prefixes.append(
+                    (registry._prefix_utf, registry._ns_uri_utf))
+    return ns_prefixes

llmeval-env/lib/python3.10/site-packages/lxml/objectpath.pxi

@@ -0,0 +1,332 @@
+################################################################################
+# ObjectPath
+
+ctypedef struct _ObjectPath:
+    const_xmlChar* href
+    const_xmlChar* name
+    Py_ssize_t index
+
+
+cdef object _NO_DEFAULT = object()
+
+
+cdef class ObjectPath:
+    """ObjectPath(path)
+    Immutable object that represents a compiled object path.
+
+    Example for a path: 'root.child[1].{other}child[25]'
+    """
+    cdef readonly object find
+    cdef list _path
+    cdef object _path_str
+    cdef _ObjectPath*  _c_path
+    cdef Py_ssize_t _path_len
+    def __init__(self, path):
+        if python._isString(path):
+            self._path = _parse_object_path_string(path)
+            self._path_str = path
+        else:
+            self._path = _parse_object_path_list(path)
+            self._path_str = '.'.join(path)
+        self._path_len = len(self._path)
+        self._c_path = _build_object_path_segments(self._path)
+        self.find = self.__call__
+
+    def __dealloc__(self):
+        if self._c_path is not NULL:
+            python.lxml_free(self._c_path)
+
+    def __str__(self):
+        return self._path_str
+
+    def __call__(self, _Element root not None, *_default):
+        """Follow the attribute path in the object structure and return the
+        target attribute value.
+
+        If it it not found, either returns a default value (if one was passed
+        as second argument) or raises AttributeError.
+        """
+        if _default:
+            if len(_default) > 1:
+                raise TypeError, "invalid number of arguments: needs one or two"
+            default = _default[0]
+        else:
+            default = _NO_DEFAULT
+        return _find_object_path(root, self._c_path, self._path_len, default)
+
+    def hasattr(self, _Element root not None):
+        "hasattr(self, root)"
+        try:
+            _find_object_path(root, self._c_path, self._path_len, _NO_DEFAULT)
+        except AttributeError:
+            return False
+        return True
+
+    def setattr(self, _Element root not None, value):
+        """setattr(self, root, value)
+
+        Set the value of the target element in a subtree.
+
+        If any of the children on the path does not exist, it is created.
+        """
+        _create_object_path(root, self._c_path, self._path_len, 1, value)
+
+    def addattr(self, _Element root not None, value):
+        """addattr(self, root, value)
+
+        Append a value to the target element in a subtree.
+
+        If any of the children on the path does not exist, it is created.
+        """
+        _create_object_path(root, self._c_path, self._path_len, 0, value)
+
+
+cdef object __MATCH_PATH_SEGMENT = re.compile(
+    r"(\.?)\s*(?:\{([^}]*)\})?\s*([^.{}\[\]\s]+)\s*(?:\[\s*([-0-9]+)\s*\])?",
+    re.U).match
+
+cdef tuple _RELATIVE_PATH_SEGMENT = (None, None, 0)
+
+
+cdef list _parse_object_path_string(_path):
+    """Parse object path string into a (ns, name, index) list.
+    """
+    cdef bint has_dot
+    cdef unicode path
+    new_path = []
+    if isinstance(_path, bytes):
+        path = (<bytes>_path).decode('ascii')
+    elif type(_path) is not unicode:
+        path = unicode(_path)
+    else:
+        path = _path
+    path = path.strip()
+    if path == '.':
+        return [_RELATIVE_PATH_SEGMENT]
+    path_pos = 0
+    while path:
+        match = __MATCH_PATH_SEGMENT(path, path_pos)
+        if match is None:
+            break
+
+        dot, ns, name, index = match.groups()
+        index = int(index) if index else 0
+        has_dot = dot == '.'
+        if not new_path:
+            if has_dot:
+                # path '.child' => ignore root
+                new_path.append(_RELATIVE_PATH_SEGMENT)
+            elif index:
+                raise ValueError, "index not allowed on root node"
+        elif not has_dot:
+            raise ValueError, "invalid path"
+        if ns is not None:
+            ns = python.PyUnicode_AsUTF8String(ns)
+        name = python.PyUnicode_AsUTF8String(name)
+        new_path.append( (ns, name, index) )
+
+        path_pos = match.end()
+    if not new_path or len(path) > path_pos:
+        raise ValueError, "invalid path"
+    return new_path
+
+
+cdef list _parse_object_path_list(path):
+    """Parse object path sequence into a (ns, name, index) list.
+    """
+    new_path = []
+    for item in path:
+        item = item.strip()
+        if not new_path and item == '':
+            # path '.child' => ignore root
+            ns = name = None
+            index = 0
+        else:
+            ns, name = cetree.getNsTag(item)
+            c_name = _xcstr(name)
+            index_pos = tree.xmlStrchr(c_name, c'[')
+            if index_pos is NULL:
+                index = 0
+            else:
+                index_end = tree.xmlStrchr(index_pos + 1, c']')
+                if index_end is NULL:
+                    raise ValueError, "index must be enclosed in []"
+                index = int(index_pos[1:index_end - index_pos])
+                if not new_path and index != 0:
+                    raise ValueError, "index not allowed on root node"
+                name = <bytes>c_name[:index_pos - c_name]
+        new_path.append( (ns, name, index) )
+    if not new_path:
+        raise ValueError, "invalid path"
+    return new_path
+
+
+cdef _ObjectPath* _build_object_path_segments(list path_list) except NULL:
+    cdef _ObjectPath* c_path
+    cdef _ObjectPath* c_path_segments
+    c_path_segments = <_ObjectPath*>python.lxml_malloc(len(path_list), sizeof(_ObjectPath))
+    if c_path_segments is NULL:
+        raise MemoryError()
+    c_path = c_path_segments
+    for href, name, index in path_list:
+        c_path[0].href = _xcstr(href) if href is not None else NULL
+        c_path[0].name = _xcstr(name) if name is not None else NULL
+        c_path[0].index = index
+        c_path += 1
+    return c_path_segments
+
+
+cdef _find_object_path(_Element root, _ObjectPath* c_path, Py_ssize_t c_path_len, default_value):
+    """Follow the path to find the target element.
+    """
+    cdef tree.xmlNode* c_node
+    cdef Py_ssize_t c_index
+    c_node = root._c_node
+    c_name = c_path[0].name
+    c_href = c_path[0].href
+    if c_href is NULL or c_href[0] == c'\0':
+        c_href = tree._getNs(c_node)
+    if not cetree.tagMatches(c_node, c_href, c_name):
+        if default_value is not _NO_DEFAULT:
+            return default_value
+        else:
+            raise ValueError(
+                f"root element does not match: need {cetree.namespacedNameFromNsName(c_href, c_name)}, got {root.tag}")
+
+    while c_node is not NULL:
+        c_path_len -= 1
+        if c_path_len <= 0:
+            break
+
+        c_path += 1
+        if c_path[0].href is not NULL:
+            c_href = c_path[0].href # otherwise: keep parent namespace
+        c_name = tree.xmlDictExists(c_node.doc.dict, c_path[0].name, -1)
+        if c_name is NULL:
+            c_name = c_path[0].name
+            c_node = NULL
+            break
+        c_index = c_path[0].index
+        c_node = c_node.last if c_index < 0 else c_node.children
+        c_node = _findFollowingSibling(c_node, c_href, c_name, c_index)
+
+    if c_node is not NULL:
+        return cetree.elementFactory(root._doc, c_node)
+    elif default_value is not _NO_DEFAULT:
+        return default_value
+    else:
+        tag = cetree.namespacedNameFromNsName(c_href, c_name)
+        raise AttributeError, f"no such child: {tag}"
+
+
+cdef _create_object_path(_Element root, _ObjectPath* c_path,
+                         Py_ssize_t c_path_len, int replace, value):
+    """Follow the path to find the target element, build the missing children
+    as needed and set the target element to 'value'.  If replace is true, an
+    existing value is replaced, otherwise the new value is added.
+    """
+    cdef _Element child
+    cdef tree.xmlNode* c_node
+    cdef tree.xmlNode* c_child
+    cdef Py_ssize_t c_index
+    if c_path_len == 1:
+        raise TypeError, "cannot update root node"
+
+    c_node = root._c_node
+    c_name = c_path[0].name
+    c_href = c_path[0].href
+    if c_href is NULL or c_href[0] == c'\0':
+        c_href = tree._getNs(c_node)
+    if not cetree.tagMatches(c_node, c_href, c_name):
+        raise ValueError(
+            f"root element does not match: need {cetree.namespacedNameFromNsName(c_href, c_name)}, got {root.tag}")
+
+    while c_path_len > 1:
+        c_path_len -= 1
+        c_path += 1
+        if c_path[0].href is not NULL:
+            c_href = c_path[0].href # otherwise: keep parent namespace
+        c_index = c_path[0].index
+        c_name = tree.xmlDictExists(c_node.doc.dict, c_path[0].name, -1)
+        if c_name is NULL:
+            c_name = c_path[0].name
+            c_child = NULL
+        else:
+            c_child = c_node.last if c_index < 0 else c_node.children
+            c_child = _findFollowingSibling(c_child, c_href, c_name, c_index)
+
+        if c_child is not NULL:
+            c_node = c_child
+        elif c_index != 0:
+            raise TypeError, "creating indexed path attributes is not supported"
+        elif c_path_len == 1:
+            _appendValue(cetree.elementFactory(root._doc, c_node),
+                         cetree.namespacedNameFromNsName(c_href, c_name),
+                         value)
+            return
+        else:
+            child = cetree.makeSubElement(
+                cetree.elementFactory(root._doc, c_node),
+                cetree.namespacedNameFromNsName(c_href, c_name),
+                None, None, None, None)
+            c_node = child._c_node
+
+    # if we get here, the entire path was already there
+    if replace:
+        element = cetree.elementFactory(root._doc, c_node)
+        _replaceElement(element, value)
+    else:
+        _appendValue(cetree.elementFactory(root._doc, c_node.parent),
+                     cetree.namespacedName(c_node), value)
+
+
+cdef list _build_descendant_paths(tree.xmlNode* c_node, prefix_string):
+    """Returns a list of all descendant paths.
+    """
+    cdef list path, path_list
+    tag = cetree.namespacedName(c_node)
+    if prefix_string:
+        if prefix_string[-1] != '.':
+            prefix_string += '.'
+        prefix_string = prefix_string + tag
+    else:
+        prefix_string = tag
+    path = [prefix_string]
+    path_list = []
+    _recursive_build_descendant_paths(c_node, path, path_list)
+    return path_list
+
+
+cdef int _recursive_build_descendant_paths(tree.xmlNode* c_node,
+                                           list path, list path_list) except -1:
+    """Fills the list 'path_list' with all descendant paths, initial prefix
+    being in the list 'path'.
+    """
+    cdef tree.xmlNode* c_child
+    tags = {}
+    path_list.append('.'.join(path))
+    c_href = tree._getNs(c_node)
+    c_child = c_node.children
+    while c_child is not NULL:
+        while c_child.type != tree.XML_ELEMENT_NODE:
+            c_child = c_child.next
+            if c_child is NULL:
+                return 0
+        if c_href is tree._getNs(c_child):
+            tag = pyunicode(c_child.name)
+        elif c_href is not NULL and tree._getNs(c_child) is NULL:
+            # special case: parent has namespace, child does not
+            tag = '{}' + pyunicode(c_child.name)
+        else:
+            tag = cetree.namespacedName(c_child)
+        count = tags.get(tag)
+        if count is None:
+            tags[tag] = 1
+        else:
+            tags[tag] = count + 1
+            tag += f'[{count}]'
+        path.append(tag)
+        _recursive_build_descendant_paths(c_child, path, path_list)
+        del path[-1]
+        c_child = c_child.next
+    return 0

llmeval-env/lib/python3.10/site-packages/lxml/parsertarget.pxi

@@ -0,0 +1,180 @@
+# Parser target context (ET target interface)
+
+cdef object inspect_getargspec
+try:
+    from inspect import getfullargspec as inspect_getargspec
+except ImportError:
+    from inspect import getargspec as inspect_getargspec
+
+
+class _TargetParserResult(Exception):
+    # Admittedly, this is somewhat ugly, but it's the easiest way
+    # to push the Python level parser result through the parser
+    # machinery towards the API level functions
+    def __init__(self, result):
+        self.result = result
+
+
+@cython.final
+@cython.internal
+cdef class _PythonSaxParserTarget(_SaxParserTarget):
+    cdef object _target_start
+    cdef object _target_end
+    cdef object _target_data
+    cdef object _target_start_ns
+    cdef object _target_end_ns
+    cdef object _target_doctype
+    cdef object _target_pi
+    cdef object _target_comment
+    cdef bint _start_takes_nsmap
+
+    def __cinit__(self, target):
+        cdef int event_filter
+        event_filter = 0
+        self._start_takes_nsmap = 0
+        try:
+            self._target_start = target.start
+            if self._target_start is not None:
+                event_filter |= SAX_EVENT_START
+        except AttributeError:
+            pass
+        else:
+            try:
+                arguments = inspect_getargspec(self._target_start)
+                if len(arguments[0]) > 3 or arguments[1] is not None:
+                    self._start_takes_nsmap = 1
+            except TypeError:
+                pass
+        try:
+            self._target_end = target.end
+            if self._target_end is not None:
+                event_filter |= SAX_EVENT_END
+        except AttributeError:
+            pass
+        try:
+            self._target_start_ns = target.start_ns
+            if self._target_start_ns is not None:
+                event_filter |= SAX_EVENT_START_NS
+        except AttributeError:
+            pass
+        try:
+            self._target_end_ns = target.end_ns
+            if self._target_end_ns is not None:
+                event_filter |= SAX_EVENT_END_NS
+        except AttributeError:
+            pass
+        try:
+            self._target_data = target.data
+            if self._target_data is not None:
+                event_filter |= SAX_EVENT_DATA
+        except AttributeError:
+            pass
+        try:
+            self._target_doctype = target.doctype
+            if self._target_doctype is not None:
+                event_filter |= SAX_EVENT_DOCTYPE
+        except AttributeError:
+            pass
+        try:
+            self._target_pi = target.pi
+            if self._target_pi is not None:
+                event_filter |= SAX_EVENT_PI
+        except AttributeError:
+            pass
+        try:
+            self._target_comment = target.comment
+            if self._target_comment is not None:
+                event_filter |= SAX_EVENT_COMMENT
+        except AttributeError:
+            pass
+        self._sax_event_filter = event_filter
+
+    cdef _handleSaxStart(self, tag, attrib, nsmap):
+        if self._start_takes_nsmap:
+            return self._target_start(tag, attrib, nsmap)
+        else:
+            return self._target_start(tag, attrib)
+
+    cdef _handleSaxEnd(self, tag):
+        return self._target_end(tag)
+
+    cdef _handleSaxStartNs(self, prefix, uri):
+        return self._target_start_ns(prefix, uri)
+
+    cdef _handleSaxEndNs(self, prefix):
+        return self._target_end_ns(prefix)
+
+    cdef int _handleSaxData(self, data) except -1:
+        self._target_data(data)
+
+    cdef int _handleSaxDoctype(self, root_tag, public_id, system_id) except -1:
+        self._target_doctype(root_tag, public_id, system_id)
+
+    cdef _handleSaxPi(self, target, data):
+        return self._target_pi(target, data)
+
+    cdef _handleSaxComment(self, comment):
+        return self._target_comment(comment)
+
+
+@cython.final
+@cython.internal
+@cython.no_gc_clear  # Required because parent class uses it - Cython bug.
+cdef class _TargetParserContext(_SaxParserContext):
+    """This class maps SAX2 events to the ET parser target interface.
+    """
+    cdef object _python_target
+    cdef int _setTarget(self, target) except -1:
+        self._python_target = target
+        if not isinstance(target, _SaxParserTarget) or \
+                hasattr(target, '__dict__'):
+            target = _PythonSaxParserTarget(target)
+        self._setSaxParserTarget(target)
+        return 0
+
+    cdef _ParserContext _copy(self):
+        cdef _TargetParserContext context
+        context = _ParserContext._copy(self)
+        context._setTarget(self._python_target)
+        return context
+
+    cdef void _cleanupTargetParserContext(self, xmlDoc* result) noexcept:
+        if self._c_ctxt.myDoc is not NULL:
+            if self._c_ctxt.myDoc is not result and \
+                    self._c_ctxt.myDoc._private is NULL:
+                # no _Document proxy => orphen
+                tree.xmlFreeDoc(self._c_ctxt.myDoc)
+            self._c_ctxt.myDoc = NULL
+
+    cdef object _handleParseResult(self, _BaseParser parser, xmlDoc* result,
+                                   filename):
+        cdef bint recover
+        recover = parser._parse_options & xmlparser.XML_PARSE_RECOVER
+        try:
+            if self._has_raised():
+                self._cleanupTargetParserContext(result)
+                self._raise_if_stored()
+            if not self._c_ctxt.wellFormed and not recover:
+                _raiseParseError(self._c_ctxt, filename, self._error_log)
+        except:
+            self._python_target.close()
+            raise
+        return self._python_target.close()
+
+    cdef xmlDoc* _handleParseResultDoc(self, _BaseParser parser,
+                                       xmlDoc* result, filename) except NULL:
+        cdef bint recover
+        recover = parser._parse_options & xmlparser.XML_PARSE_RECOVER
+        if result is not NULL and result._private is NULL:
+            # no _Document proxy => orphen
+            tree.xmlFreeDoc(result)
+        try:
+            self._cleanupTargetParserContext(result)
+            self._raise_if_stored()
+            if not self._c_ctxt.wellFormed and not recover:
+                _raiseParseError(self._c_ctxt, filename, self._error_log)
+        except:
+            self._python_target.close()
+            raise
+        parse_result = self._python_target.close()
+        raise _TargetParserResult(parse_result)

llmeval-env/lib/python3.10/site-packages/lxml/proxy.pxi

@@ -0,0 +1,619 @@
+# Proxy functions and low level node allocation stuff
+
+# Proxies represent elements, their reference is stored in the C
+# structure of the respective node to avoid multiple instantiation of
+# the Python class.
+
+@cython.linetrace(False)
+@cython.profile(False)
+cdef inline _Element getProxy(xmlNode* c_node):
+    """Get a proxy for a given node.
+    """
+    #print "getProxy for:", <int>c_node
+    if c_node is not NULL and c_node._private is not NULL:
+        return <_Element>c_node._private
+    else:
+        return None
+
+
+@cython.linetrace(False)
+@cython.profile(False)
+cdef inline bint hasProxy(xmlNode* c_node):
+    if c_node._private is NULL:
+        return False
+    return True
+
+
+@cython.linetrace(False)
+@cython.profile(False)
+cdef inline int _registerProxy(_Element proxy, _Document doc,
+                               xmlNode* c_node) except -1:
+    """Register a proxy and type for the node it's proxying for.
+    """
+    #print "registering for:", <int>proxy._c_node
+    assert not hasProxy(c_node), "double registering proxy!"
+    proxy._doc = doc
+    proxy._c_node = c_node
+    c_node._private = <void*>proxy
+    return 0
+
+
+@cython.linetrace(False)
+@cython.profile(False)
+cdef inline int _unregisterProxy(_Element proxy) except -1:
+    """Unregister a proxy for the node it's proxying for.
+    """
+    cdef xmlNode* c_node = proxy._c_node
+    assert c_node._private is <void*>proxy, "Tried to unregister unknown proxy"
+    c_node._private = NULL
+    return 0
+
+
+################################################################################
+# temporarily make a node the root node of its document
+
+cdef xmlDoc* _fakeRootDoc(xmlDoc* c_base_doc, xmlNode* c_node) except NULL:
+    return _plainFakeRootDoc(c_base_doc, c_node, 1)
+
+cdef xmlDoc* _plainFakeRootDoc(xmlDoc* c_base_doc, xmlNode* c_node,
+                               bint with_siblings) except NULL:
+    # build a temporary document that has the given node as root node
+    # note that copy and original must not be modified during its lifetime!!
+    # always call _destroyFakeDoc() after use!
+    cdef xmlNode* c_child
+    cdef xmlNode* c_root
+    cdef xmlNode* c_new_root
+    cdef xmlDoc*  c_doc
+    if with_siblings or (c_node.prev is NULL and c_node.next is NULL):
+        c_root = tree.xmlDocGetRootElement(c_base_doc)
+        if c_root is c_node:
+            # already the root node, no siblings
+            return c_base_doc
+
+    c_doc  = _copyDoc(c_base_doc, 0)                   # non recursive!
+    c_new_root = tree.xmlDocCopyNode(c_node, c_doc, 2) # non recursive!
+    tree.xmlDocSetRootElement(c_doc, c_new_root)
+    _copyParentNamespaces(c_node, c_new_root)
+
+    c_new_root.children = c_node.children
+    c_new_root.last = c_node.last
+    c_new_root.next = c_new_root.prev = NULL
+
+    # store original node
+    c_doc._private = c_node
+
+    # divert parent pointers of children
+    c_child = c_new_root.children
+    while c_child is not NULL:
+        c_child.parent = c_new_root
+        c_child = c_child.next
+
+    c_doc.children = c_new_root
+    return c_doc
+
+cdef void _destroyFakeDoc(xmlDoc* c_base_doc, xmlDoc* c_doc) noexcept:
+    # delete a temporary document
+    cdef xmlNode* c_child
+    cdef xmlNode* c_parent
+    cdef xmlNode* c_root
+    if c_doc is c_base_doc:
+        return
+    c_root = tree.xmlDocGetRootElement(c_doc)
+
+    # restore parent pointers of children
+    c_parent = <xmlNode*>c_doc._private
+    c_child = c_root.children
+    while c_child is not NULL:
+        c_child.parent = c_parent
+        c_child = c_child.next
+
+    # prevent recursive removal of children
+    c_root.children = c_root.last = NULL
+    tree.xmlFreeDoc(c_doc)
+
+cdef _Element _fakeDocElementFactory(_Document doc, xmlNode* c_element):
+    """Special element factory for cases where we need to create a fake
+    root document, but still need to instantiate arbitrary nodes from
+    it.  If we instantiate the fake root node, things will turn bad
+    when it's destroyed.
+
+    Instead, if we are asked to instantiate the fake root node, we
+    instantiate the original node instead.
+    """
+    if c_element.doc is not doc._c_doc:
+        if c_element.doc._private is not NULL:
+            if c_element is c_element.doc.children:
+                c_element = <xmlNode*>c_element.doc._private
+                #assert c_element.type == tree.XML_ELEMENT_NODE
+    return _elementFactory(doc, c_element)
+
+################################################################################
+# support for freeing tree elements when proxy objects are destroyed
+
+cdef int attemptDeallocation(xmlNode* c_node) noexcept:
+    """Attempt deallocation of c_node (or higher up in tree).
+    """
+    cdef xmlNode* c_top
+    # could be we actually aren't referring to the tree at all
+    if c_node is NULL:
+        #print "not freeing, node is NULL"
+        return 0
+    c_top = getDeallocationTop(c_node)
+    if c_top is not NULL:
+        #print "freeing:", c_top.name
+        _removeText(c_top.next) # tail
+        tree.xmlFreeNode(c_top)
+        return 1
+    return 0
+
+cdef xmlNode* getDeallocationTop(xmlNode* c_node) noexcept:
+    """Return the top of the tree that can be deallocated, or NULL.
+    """
+    cdef xmlNode* c_next
+    #print "trying to do deallocating:", c_node.type
+    if hasProxy(c_node):
+        #print "Not freeing: proxies still exist"
+        return NULL
+    while c_node.parent is not NULL:
+        c_node = c_node.parent
+        #print "checking:", c_current.type
+        if c_node.type == tree.XML_DOCUMENT_NODE or \
+               c_node.type == tree.XML_HTML_DOCUMENT_NODE:
+            #print "not freeing: still in doc"
+            return NULL
+        # if we're still attached to the document, don't deallocate
+        if hasProxy(c_node):
+            #print "Not freeing: proxies still exist"
+            return NULL
+    # see whether we have children to deallocate
+    if not canDeallocateChildNodes(c_node):
+        return NULL
+    # see whether we have siblings to deallocate
+    c_next = c_node.prev
+    while c_next:
+        if _isElement(c_next):
+            if hasProxy(c_next) or not canDeallocateChildNodes(c_next):
+                return NULL
+        c_next = c_next.prev
+    c_next = c_node.next
+    while c_next:
+        if _isElement(c_next):
+            if hasProxy(c_next) or not canDeallocateChildNodes(c_next):
+                return NULL
+        c_next = c_next.next
+    return c_node
+
+cdef int canDeallocateChildNodes(xmlNode* c_parent) noexcept:
+    cdef xmlNode* c_node
+    c_node = c_parent.children
+    tree.BEGIN_FOR_EACH_ELEMENT_FROM(c_parent, c_node, 1)
+    if hasProxy(c_node):
+        return 0
+    tree.END_FOR_EACH_ELEMENT_FROM(c_node)
+    return 1
+
+################################################################################
+# fix _Document references and namespaces when a node changes documents
+
+cdef void _copyParentNamespaces(xmlNode* c_from_node, xmlNode* c_to_node) noexcept nogil:
+    """Copy the namespaces of all ancestors of c_from_node to c_to_node.
+    """
+    cdef xmlNode* c_parent
+    cdef xmlNs* c_ns
+    cdef xmlNs* c_new_ns
+    cdef int prefix_known
+    c_parent = c_from_node.parent
+    while c_parent and (tree._isElementOrXInclude(c_parent) or
+                        c_parent.type == tree.XML_DOCUMENT_NODE):
+        c_new_ns = c_parent.nsDef
+        while c_new_ns:
+            # libxml2 will check if the prefix is already defined
+            tree.xmlNewNs(c_to_node, c_new_ns.href, c_new_ns.prefix)
+            c_new_ns = c_new_ns.next
+        c_parent = c_parent.parent
+
+
+ctypedef struct _ns_update_map:
+    xmlNs* old
+    xmlNs* new
+
+
+ctypedef struct _nscache:
+    _ns_update_map* ns_map
+    size_t size
+    size_t last
+
+
+cdef int _growNsCache(_nscache* c_ns_cache) except -1:
+    cdef _ns_update_map* ns_map_ptr
+    if c_ns_cache.size == 0:
+        c_ns_cache.size = 20
+    else:
+        c_ns_cache.size *= 2
+    ns_map_ptr = <_ns_update_map*> python.lxml_realloc(
+        c_ns_cache.ns_map, c_ns_cache.size, sizeof(_ns_update_map))
+    if not ns_map_ptr:
+        python.lxml_free(c_ns_cache.ns_map)
+        c_ns_cache.ns_map = NULL
+        raise MemoryError()
+    c_ns_cache.ns_map = ns_map_ptr
+    return 0
+
+
+cdef inline int _appendToNsCache(_nscache* c_ns_cache,
+                                 xmlNs* c_old_ns, xmlNs* c_new_ns) except -1:
+    if c_ns_cache.last >= c_ns_cache.size:
+        _growNsCache(c_ns_cache)
+    c_ns_cache.ns_map[c_ns_cache.last] = _ns_update_map(old=c_old_ns, new=c_new_ns)
+    c_ns_cache.last += 1
+
+
+cdef int _stripRedundantNamespaceDeclarations(xmlNode* c_element, _nscache* c_ns_cache,
+                                              xmlNs** c_del_ns_list) except -1:
+    """Removes namespace declarations from an element that are already
+    defined in its parents.  Does not free the xmlNs's, just prepends
+    them to the c_del_ns_list.
+    """
+    cdef xmlNs* c_ns
+    cdef xmlNs* c_ns_next
+    cdef xmlNs** c_nsdef
+    # use a xmlNs** to handle assignments to "c_element.nsDef" correctly
+    c_nsdef = &c_element.nsDef
+    while c_nsdef[0] is not NULL:
+        c_ns = tree.xmlSearchNsByHref(
+            c_element.doc, c_element.parent, c_nsdef[0].href)
+        if c_ns is NULL:
+            # new namespace href => keep and cache the ns declaration
+            _appendToNsCache(c_ns_cache, c_nsdef[0], c_nsdef[0])
+            c_nsdef = &c_nsdef[0].next
+        else:
+            # known namespace href => cache mapping and strip old ns
+            _appendToNsCache(c_ns_cache, c_nsdef[0], c_ns)
+            # cut out c_nsdef.next and prepend it to garbage chain
+            c_ns_next = c_nsdef[0].next
+            c_nsdef[0].next = c_del_ns_list[0]
+            c_del_ns_list[0] = c_nsdef[0]
+            c_nsdef[0] = c_ns_next
+    return 0
+
+
+cdef void _cleanUpFromNamespaceAdaptation(xmlNode* c_start_node,
+                                          _nscache* c_ns_cache, xmlNs* c_del_ns_list) noexcept:
+    # Try to recover from exceptions with really bad timing.  We were in the middle
+    # of ripping out xmlNS-es and likely ran out of memory.  Try to fix up the tree
+    # by re-adding the original xmlNs declarations (which might still be used in some
+    # places).
+    if c_ns_cache.ns_map:
+        python.lxml_free(c_ns_cache.ns_map)
+    if c_del_ns_list:
+        if not c_start_node.nsDef:
+            c_start_node.nsDef = c_del_ns_list
+        else:
+            c_ns = c_start_node.nsDef
+            while c_ns.next:
+                c_ns = c_ns.next
+            c_ns.next = c_del_ns_list
+
+
+cdef int moveNodeToDocument(_Document doc, xmlDoc* c_source_doc,
+                            xmlNode* c_element) except -1:
+    """Fix the xmlNs pointers of a node and its subtree that were moved.
+
+    Originally copied from libxml2's xmlReconciliateNs().  Expects
+    libxml2 doc pointers of node to be correct already, but fixes
+    _Document references.
+
+    For each node in the subtree, we do this:
+
+    1) Remove redundant declarations of namespace that are already
+       defined in its parents.
+
+    2) Replace namespaces that are *not* defined on the node or its
+       parents by the equivalent namespace declarations that *are*
+       defined on the node or its parents (possibly using a different
+       prefix).  If a namespace is unknown, declare a new one on the
+       node.
+
+    3) Reassign the names of tags and attribute from the dict of the
+       target document *iff* it is different from the dict used in the
+       source subtree.
+
+    4) Set the Document reference to the new Document (if different).
+       This is done on backtracking to keep the original Document
+       alive as long as possible, until all its elements are updated.
+
+    Note that the namespace declarations are removed from the tree in
+    step 1), but freed only after the complete subtree was traversed
+    and all occurrences were replaced by tree-internal pointers.
+    """
+    cdef xmlNode* c_start_node
+    cdef xmlNode* c_node
+    cdef xmlDoc* c_doc = doc._c_doc
+    cdef tree.xmlAttr* c_attr
+    cdef char* c_name
+    cdef _nscache c_ns_cache = [NULL, 0, 0]
+    cdef xmlNs* c_del_ns_list = NULL
+    cdef proxy_count = 0
+
+    if not tree._isElementOrXInclude(c_element):
+        return 0
+
+    c_start_node = c_element
+
+    tree.BEGIN_FOR_EACH_FROM(c_element, c_element, 1)
+    if tree._isElementOrXInclude(c_element):
+        if hasProxy(c_element):
+            proxy_count += 1
+
+        # 1) cut out namespaces defined here that are already known by
+        #    the ancestors
+        if c_element.nsDef is not NULL:
+            try:
+                _stripRedundantNamespaceDeclarations(c_element, &c_ns_cache, &c_del_ns_list)
+            except:
+                _cleanUpFromNamespaceAdaptation(c_start_node, &c_ns_cache, c_del_ns_list)
+                raise
+
+        # 2) make sure the namespaces of an element and its attributes
+        #    are declared in this document (i.e. on the node or its parents)
+        if c_element.ns is not NULL:
+            _fixCNs(doc, c_start_node, c_element, &c_ns_cache, c_del_ns_list)
+
+        c_node = <xmlNode*>c_element.properties
+        while c_node is not NULL:
+            if c_node.ns is not NULL:
+                _fixCNs(doc, c_start_node, c_node, &c_ns_cache, c_del_ns_list)
+            c_node = c_node.next
+
+    tree.END_FOR_EACH_FROM(c_element)
+
+    # free now unused namespace declarations
+    if c_del_ns_list is not NULL:
+        tree.xmlFreeNsList(c_del_ns_list)
+
+    # cleanup
+    if c_ns_cache.ns_map is not NULL:
+        python.lxml_free(c_ns_cache.ns_map)
+
+    # 3) fix the names in the tree if we moved it from a different thread
+    if doc._c_doc.dict is not c_source_doc.dict:
+        fixThreadDictNames(c_start_node, c_source_doc.dict, doc._c_doc.dict)
+
+    # 4) fix _Document references
+    #    (and potentially deallocate the source document)
+    if proxy_count > 0:
+        if proxy_count == 1 and c_start_node._private is not NULL:
+            proxy = getProxy(c_start_node)
+            if proxy is not None:
+                if proxy._doc is not doc:
+                    proxy._doc = doc
+            else:
+                fixElementDocument(c_start_node, doc, proxy_count)
+        else:
+            fixElementDocument(c_start_node, doc, proxy_count)
+
+    return 0
+
+
+cdef void _setTreeDoc(xmlNode* c_node, xmlDoc* c_doc) noexcept:
+    """Adaptation of 'xmlSetTreeDoc()' that deep-fixes the document links iteratively.
+    It avoids https://gitlab.gnome.org/GNOME/libxml2/issues/42
+    """
+    tree.BEGIN_FOR_EACH_FROM(c_node, c_node, 1)
+    if c_node.type == tree.XML_ELEMENT_NODE:
+        c_attr = <tree.xmlAttr*>c_node.properties
+        while c_attr:
+            if c_attr.atype == tree.XML_ATTRIBUTE_ID:
+                tree.xmlRemoveID(c_node.doc, c_attr)
+            c_attr.doc = c_doc
+            _fixDocChildren(c_attr.children, c_doc)
+            c_attr = c_attr.next
+    # Set doc link for all nodes, not only elements.
+    c_node.doc = c_doc
+    tree.END_FOR_EACH_FROM(c_node)
+
+
+cdef inline void _fixDocChildren(xmlNode* c_child, xmlDoc* c_doc) noexcept:
+    while c_child:
+        c_child.doc = c_doc
+        if c_child.children:
+            _fixDocChildren(c_child.children, c_doc)
+        c_child = c_child.next
+
+
+cdef int _fixCNs(_Document doc, xmlNode* c_start_node, xmlNode* c_node,
+                 _nscache* c_ns_cache, xmlNs* c_del_ns_list) except -1:
+    cdef xmlNs* c_ns = NULL
+    cdef bint is_prefixed_attr = (c_node.type == tree.XML_ATTRIBUTE_NODE and c_node.ns.prefix)
+
+    for ns_map in c_ns_cache.ns_map[:c_ns_cache.last]:
+        if c_node.ns is ns_map.old:
+            if is_prefixed_attr and not ns_map.new.prefix:
+                # avoid dropping prefix from attributes
+                continue
+            c_ns = ns_map.new
+            break
+
+    if c_ns:
+        c_node.ns = c_ns
+    else:
+        # not in cache or not acceptable
+        # => find a replacement from this document
+        try:
+            c_ns = doc._findOrBuildNodeNs(
+                c_start_node, c_node.ns.href, c_node.ns.prefix,
+                c_node.type == tree.XML_ATTRIBUTE_NODE)
+            c_node.ns = c_ns
+            _appendToNsCache(c_ns_cache, c_node.ns, c_ns)
+        except:
+            _cleanUpFromNamespaceAdaptation(c_start_node, c_ns_cache, c_del_ns_list)
+            raise
+    return 0
+
+
+cdef int fixElementDocument(xmlNode* c_element, _Document doc,
+                             size_t proxy_count) except -1:
+    cdef xmlNode* c_node = c_element
+    cdef _Element proxy = None # init-to-None required due to fake-loop below
+    tree.BEGIN_FOR_EACH_FROM(c_element, c_node, 1)
+    if c_node._private is not NULL:
+        proxy = getProxy(c_node)
+        if proxy is not None:
+            if proxy._doc is not doc:
+                proxy._doc = doc
+            proxy_count -= 1
+            if proxy_count == 0:
+                return 0
+    tree.END_FOR_EACH_FROM(c_node)
+
+
+cdef void fixThreadDictNames(xmlNode* c_element,
+                             tree.xmlDict* c_src_dict,
+                             tree.xmlDict* c_dict) noexcept nogil:
+    # re-assign the names of tags and attributes
+    #
+    # this should only be called when the element is based on a
+    # different libxml2 tag name dictionary
+    if c_element.type == tree.XML_DOCUMENT_NODE or \
+            c_element.type == tree.XML_HTML_DOCUMENT_NODE:
+        # may define "xml" namespace
+        fixThreadDictNsForNode(c_element, c_src_dict, c_dict)
+        if c_element.doc.extSubset:
+            fixThreadDictNamesForDtd(c_element.doc.extSubset, c_src_dict, c_dict)
+        if c_element.doc.intSubset:
+            fixThreadDictNamesForDtd(c_element.doc.intSubset, c_src_dict, c_dict)
+        c_element = c_element.children
+        while c_element is not NULL:
+            fixThreadDictNamesForNode(c_element, c_src_dict, c_dict)
+            c_element = c_element.next
+    elif tree._isElementOrXInclude(c_element):
+        fixThreadDictNamesForNode(c_element, c_src_dict, c_dict)
+
+
+cdef inline void _fixThreadDictPtr(const_xmlChar** c_ptr,
+                                   tree.xmlDict* c_src_dict,
+                                   tree.xmlDict* c_dict) noexcept nogil:
+    c_str = c_ptr[0]
+    if c_str and c_src_dict and tree.xmlDictOwns(c_src_dict, c_str):
+        # return value can be NULL on memory error, but we don't handle that here
+        c_str = tree.xmlDictLookup(c_dict, c_str, -1)
+        if c_str:
+            c_ptr[0] = c_str
+
+
+cdef void fixThreadDictNamesForNode(xmlNode* c_element,
+                                    tree.xmlDict* c_src_dict,
+                                    tree.xmlDict* c_dict) noexcept nogil:
+    cdef xmlNode* c_node = c_element
+    tree.BEGIN_FOR_EACH_FROM(c_element, c_node, 1)
+    if c_node.type in (tree.XML_ELEMENT_NODE, tree.XML_XINCLUDE_START):
+        fixThreadDictNamesForAttributes(
+            c_node.properties, c_src_dict, c_dict)
+        fixThreadDictNsForNode(c_node, c_src_dict, c_dict)
+        _fixThreadDictPtr(&c_node.name, c_src_dict, c_dict)
+    elif c_node.type == tree.XML_TEXT_NODE:
+        # libxml2's SAX2 parser interns some indentation space
+        fixThreadDictContentForNode(c_node, c_src_dict, c_dict)
+    elif c_node.type == tree.XML_COMMENT_NODE:
+        pass  # don't touch c_node.name
+    else:
+        _fixThreadDictPtr(&c_node.name, c_src_dict, c_dict)
+    tree.END_FOR_EACH_FROM(c_node)
+
+
+cdef inline void fixThreadDictNamesForAttributes(tree.xmlAttr* c_attr,
+                                                 tree.xmlDict* c_src_dict,
+                                                 tree.xmlDict* c_dict) noexcept nogil:
+    cdef xmlNode* c_child
+    cdef xmlNode* c_node = <xmlNode*>c_attr
+    while c_node is not NULL:
+        if c_node.type not in (tree.XML_TEXT_NODE, tree.XML_COMMENT_NODE):
+            _fixThreadDictPtr(&c_node.name, c_src_dict, c_dict)
+        # libxml2 keeps some (!) attribute values in the dict
+        c_child = c_node.children
+        while c_child is not NULL:
+            fixThreadDictContentForNode(c_child, c_src_dict, c_dict)
+            c_child = c_child.next
+        c_node = c_node.next
+
+
+cdef inline void fixThreadDictContentForNode(xmlNode* c_node,
+                                             tree.xmlDict* c_src_dict,
+                                             tree.xmlDict* c_dict) noexcept nogil:
+    if c_node.content is not NULL and \
+           c_node.content is not <xmlChar*>&c_node.properties:
+        if tree.xmlDictOwns(c_src_dict, c_node.content):
+            # result can be NULL on memory error, but we don't handle that here
+            c_node.content = <xmlChar*>tree.xmlDictLookup(c_dict, c_node.content, -1)
+
+
+cdef inline void fixThreadDictNsForNode(xmlNode* c_node,
+                                        tree.xmlDict* c_src_dict,
+                                        tree.xmlDict* c_dict) noexcept nogil:
+    cdef xmlNs* c_ns = c_node.nsDef
+    while c_ns is not NULL:
+        _fixThreadDictPtr(&c_ns.href, c_src_dict, c_dict)
+        _fixThreadDictPtr(&c_ns.prefix, c_src_dict, c_dict)
+        c_ns = c_ns.next
+
+
+cdef void fixThreadDictNamesForDtd(tree.xmlDtd* c_dtd,
+                                   tree.xmlDict* c_src_dict,
+                                   tree.xmlDict* c_dict) noexcept nogil:
+    cdef xmlNode* c_node
+    cdef tree.xmlElement* c_element
+    cdef tree.xmlAttribute* c_attribute
+    cdef tree.xmlEntity* c_entity
+
+    c_node = c_dtd.children
+    while c_node:
+        if c_node.type == tree.XML_ELEMENT_DECL:
+            c_element = <tree.xmlElement*>c_node
+            if c_element.content:
+                _fixThreadDictPtr(&c_element.content.name, c_src_dict, c_dict)
+                _fixThreadDictPtr(&c_element.content.prefix, c_src_dict, c_dict)
+            c_attribute = c_element.attributes
+            while c_attribute:
+                _fixThreadDictPtr(&c_attribute.defaultValue, c_src_dict, c_dict)
+                _fixThreadDictPtr(&c_attribute.name, c_src_dict, c_dict)
+                _fixThreadDictPtr(&c_attribute.prefix, c_src_dict, c_dict)
+                _fixThreadDictPtr(&c_attribute.elem, c_src_dict, c_dict)
+                c_attribute = c_attribute.nexth
+        elif c_node.type == tree.XML_ENTITY_DECL:
+            c_entity = <tree.xmlEntity*>c_node
+            _fixThreadDictPtr(&c_entity.name, c_src_dict, c_dict)
+            _fixThreadDictPtr(&c_entity.ExternalID, c_src_dict, c_dict)
+            _fixThreadDictPtr(&c_entity.SystemID, c_src_dict, c_dict)
+            _fixThreadDictPtr(<const_xmlChar**>&c_entity.content, c_src_dict, c_dict)
+        c_node = c_node.next
+
+
+################################################################################
+# adopt an xmlDoc from an external libxml2 document source
+
+cdef _Document _adoptForeignDoc(xmlDoc* c_doc, _BaseParser parser=None, bint is_owned=True):
+    """Convert and wrap an externally produced xmlDoc for use in lxml.
+    Assures that all '_private' pointers are NULL to prevent accidental
+    dereference into lxml proxy objects.
+    """
+    if c_doc is NULL:
+        raise ValueError("Illegal document provided: NULL")
+    if c_doc.type not in (tree.XML_DOCUMENT_NODE, tree.XML_HTML_DOCUMENT_NODE):
+        doc_type = c_doc.type
+        if is_owned:
+            tree.xmlFreeDoc(c_doc)
+        raise ValueError(f"Illegal document provided: expected XML or HTML, found {doc_type}")
+
+    cdef xmlNode* c_node = <xmlNode*>c_doc
+
+    if is_owned:
+        tree.BEGIN_FOR_EACH_FROM(<xmlNode*>c_doc, c_node, 1)
+        c_node._private = NULL
+        tree.END_FOR_EACH_FROM(c_node)
+    else:
+        # create a fresh copy that lxml owns
+        c_doc = tree.xmlCopyDoc(c_doc, 1)
+        if c_doc is NULL:
+            raise MemoryError()
+
+    return _documentFactory(c_doc, parser)

llmeval-env/lib/python3.10/site-packages/lxml/pyclasslookup.py

@@ -0,0 +1,3 @@
+# dummy module for backwards compatibility
+
+from lxml.etree import PythonElementClassLookup

llmeval-env/lib/python3.10/site-packages/lxml/saxparser.pxi

@@ -0,0 +1,875 @@
+# SAX-like interfaces
+
+class XMLSyntaxAssertionError(XMLSyntaxError, AssertionError):
+    """
+    An XMLSyntaxError that additionally inherits from AssertionError for
+    ElementTree / backwards compatibility reasons.
+
+    This class may get replaced by a plain XMLSyntaxError in a future version.
+    """
+    def __init__(self, message):
+        XMLSyntaxError.__init__(self, message, None, 0, 1)
+
+
+ctypedef enum _SaxParserEvents:
+    SAX_EVENT_START    = 1 << 0
+    SAX_EVENT_END      = 1 << 1
+    SAX_EVENT_DATA     = 1 << 2
+    SAX_EVENT_DOCTYPE  = 1 << 3
+    SAX_EVENT_PI       = 1 << 4
+    SAX_EVENT_COMMENT  = 1 << 5
+    SAX_EVENT_START_NS = 1 << 6
+    SAX_EVENT_END_NS   = 1 << 7
+
+ctypedef enum _ParseEventFilter:
+    PARSE_EVENT_FILTER_START     = 1 << 0
+    PARSE_EVENT_FILTER_END       = 1 << 1
+    PARSE_EVENT_FILTER_START_NS  = 1 << 2
+    PARSE_EVENT_FILTER_END_NS    = 1 << 3
+    PARSE_EVENT_FILTER_COMMENT   = 1 << 4
+    PARSE_EVENT_FILTER_PI        = 1 << 5
+
+
+cdef int _buildParseEventFilter(events) except -1:
+    cdef int event_filter = 0
+    for event in events:
+        if event == 'start':
+            event_filter |= PARSE_EVENT_FILTER_START
+        elif event == 'end':
+            event_filter |= PARSE_EVENT_FILTER_END
+        elif event == 'start-ns':
+            event_filter |= PARSE_EVENT_FILTER_START_NS
+        elif event == 'end-ns':
+            event_filter |= PARSE_EVENT_FILTER_END_NS
+        elif event == 'comment':
+            event_filter |= PARSE_EVENT_FILTER_COMMENT
+        elif event == 'pi':
+            event_filter |= PARSE_EVENT_FILTER_PI
+        else:
+            raise ValueError, f"invalid event name '{event}'"
+    return event_filter
+
+
+cdef class _SaxParserTarget:
+    cdef int _sax_event_filter
+
+    cdef _handleSaxStart(self, tag, attrib, nsmap):
+        return None
+    cdef _handleSaxEnd(self, tag):
+        return None
+    cdef int _handleSaxData(self, data) except -1:
+        return 0
+    cdef int _handleSaxDoctype(self, root_tag, public_id, system_id) except -1:
+        return 0
+    cdef _handleSaxPi(self, target, data):
+        return None
+    cdef _handleSaxComment(self, comment):
+        return None
+    cdef _handleSaxStartNs(self, prefix, uri):
+        return None
+    cdef _handleSaxEndNs(self, prefix):
+        return None
+
+
+#@cython.final
+@cython.internal
+@cython.no_gc_clear  # Required because parent class uses it - Cython bug.
+cdef class _SaxParserContext(_ParserContext):
+    """This class maps SAX2 events to parser target events.
+    """
+    cdef _SaxParserTarget _target
+    cdef _BaseParser _parser
+    cdef xmlparser.startElementNsSAX2Func _origSaxStart
+    cdef xmlparser.endElementNsSAX2Func   _origSaxEnd
+    cdef xmlparser.startElementSAXFunc    _origSaxStartNoNs
+    cdef xmlparser.endElementSAXFunc      _origSaxEndNoNs
+    cdef xmlparser.charactersSAXFunc      _origSaxData
+    cdef xmlparser.cdataBlockSAXFunc      _origSaxCData
+    cdef xmlparser.internalSubsetSAXFunc  _origSaxDoctype
+    cdef xmlparser.commentSAXFunc         _origSaxComment
+    cdef xmlparser.processingInstructionSAXFunc _origSaxPI
+    cdef xmlparser.startDocumentSAXFunc   _origSaxStartDocument
+
+    # for event collecting
+    cdef int _event_filter
+    cdef list _ns_stack
+    cdef list _node_stack
+    cdef _ParseEventsIterator events_iterator
+
+    # for iterparse
+    cdef _Element  _root
+    cdef _MultiTagMatcher _matcher
+
+    def __cinit__(self, _BaseParser parser):
+        self._ns_stack = []
+        self._node_stack = []
+        self._parser = parser
+        self.events_iterator = _ParseEventsIterator()
+
+    cdef void _setSaxParserTarget(self, _SaxParserTarget target) noexcept:
+        self._target = target
+
+    cdef void _initParserContext(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        _ParserContext._initParserContext(self, c_ctxt)
+        if self._target is not None:
+            self._connectTarget(c_ctxt)
+        elif self._event_filter:
+            self._connectEvents(c_ctxt)
+
+    cdef void _connectTarget(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        """Wrap original SAX2 callbacks to call into parser target.
+        """
+        sax = c_ctxt.sax
+        self._origSaxStart = sax.startElementNs = NULL
+        self._origSaxStartNoNs = sax.startElement = NULL
+        if self._target._sax_event_filter & (SAX_EVENT_START |
+                                             SAX_EVENT_START_NS |
+                                             SAX_EVENT_END_NS):
+            # intercept => overwrite orig callback
+            # FIXME: also intercept on when collecting END events
+            if sax.initialized == xmlparser.XML_SAX2_MAGIC:
+                sax.startElementNs = _handleSaxTargetStart
+            if self._target._sax_event_filter & SAX_EVENT_START:
+                sax.startElement = _handleSaxTargetStartNoNs
+
+        self._origSaxEnd = sax.endElementNs = NULL
+        self._origSaxEndNoNs = sax.endElement = NULL
+        if self._target._sax_event_filter & (SAX_EVENT_END |
+                                             SAX_EVENT_END_NS):
+            if sax.initialized == xmlparser.XML_SAX2_MAGIC:
+                sax.endElementNs = _handleSaxEnd
+            if self._target._sax_event_filter & SAX_EVENT_END:
+                sax.endElement = _handleSaxEndNoNs
+
+        self._origSaxData = sax.characters = sax.cdataBlock = NULL
+        if self._target._sax_event_filter & SAX_EVENT_DATA:
+            sax.characters = sax.cdataBlock = _handleSaxData
+
+        # doctype propagation is always required for entity replacement
+        self._origSaxDoctype = sax.internalSubset
+        if self._target._sax_event_filter & SAX_EVENT_DOCTYPE:
+            sax.internalSubset = _handleSaxTargetDoctype
+
+        self._origSaxPI = sax.processingInstruction = NULL
+        if self._target._sax_event_filter & SAX_EVENT_PI:
+            sax.processingInstruction = _handleSaxTargetPI
+
+        self._origSaxComment = sax.comment = NULL
+        if self._target._sax_event_filter & SAX_EVENT_COMMENT:
+            sax.comment = _handleSaxTargetComment
+
+        # enforce entity replacement
+        sax.reference = NULL
+        c_ctxt.replaceEntities = 1
+
+    cdef void _connectEvents(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        """Wrap original SAX2 callbacks to collect parse events without parser target.
+        """
+        sax = c_ctxt.sax
+        self._origSaxStartDocument = sax.startDocument
+        sax.startDocument = _handleSaxStartDocument
+
+        # only override "start" event handler if needed
+        self._origSaxStart = sax.startElementNs
+        if self._event_filter == 0 or c_ctxt.html or \
+               self._event_filter & (PARSE_EVENT_FILTER_START |
+                                     PARSE_EVENT_FILTER_END |
+                                     PARSE_EVENT_FILTER_START_NS |
+                                     PARSE_EVENT_FILTER_END_NS):
+            sax.startElementNs = <xmlparser.startElementNsSAX2Func>_handleSaxStart
+
+        self._origSaxStartNoNs = sax.startElement
+        if self._event_filter == 0 or c_ctxt.html or \
+               self._event_filter & (PARSE_EVENT_FILTER_START |
+                                     PARSE_EVENT_FILTER_END):
+            sax.startElement = <xmlparser.startElementSAXFunc>_handleSaxStartNoNs
+
+        # only override "end" event handler if needed
+        self._origSaxEnd = sax.endElementNs
+        if self._event_filter == 0 or \
+               self._event_filter & (PARSE_EVENT_FILTER_END |
+                                     PARSE_EVENT_FILTER_END_NS):
+            sax.endElementNs = <xmlparser.endElementNsSAX2Func>_handleSaxEnd
+
+        self._origSaxEndNoNs = sax.endElement
+        if self._event_filter == 0 or \
+               self._event_filter & PARSE_EVENT_FILTER_END:
+            sax.endElement = <xmlparser.endElementSAXFunc>_handleSaxEndNoNs
+
+        self._origSaxComment = sax.comment
+        if self._event_filter & PARSE_EVENT_FILTER_COMMENT:
+            sax.comment = <xmlparser.commentSAXFunc>_handleSaxComment
+
+        self._origSaxPI = sax.processingInstruction
+        if self._event_filter & PARSE_EVENT_FILTER_PI:
+            sax.processingInstruction = <xmlparser.processingInstructionSAXFunc>_handleSaxPIEvent
+
+    cdef _setEventFilter(self, events, tag):
+        self._event_filter = _buildParseEventFilter(events)
+        if not self._event_filter or tag is None or tag == '*':
+            self._matcher = None
+        else:
+            self._matcher = _MultiTagMatcher.__new__(_MultiTagMatcher, tag)
+
+    cdef int startDocument(self, xmlDoc* c_doc) except -1:
+        try:
+            self._doc = _documentFactory(c_doc, self._parser)
+        finally:
+            self._parser = None  # clear circular reference ASAP
+        if self._matcher is not None:
+            self._matcher.cacheTags(self._doc, True) # force entry in libxml2 dict
+        return 0
+
+    cdef int pushEvent(self, event, xmlNode* c_node) except -1:
+        cdef _Element root
+        if self._root is None:
+            root = self._doc.getroot()
+            if root is not None and root._c_node.type == tree.XML_ELEMENT_NODE:
+                self._root = root
+        node = _elementFactory(self._doc, c_node)
+        self.events_iterator._events.append( (event, node) )
+        return 0
+
+    cdef int flushEvents(self) except -1:
+        events = self.events_iterator._events
+        while self._node_stack:
+            events.append( ('end', self._node_stack.pop()) )
+            _pushSaxNsEndEvents(self)
+        while self._ns_stack:
+            _pushSaxNsEndEvents(self)
+
+    cdef void _handleSaxException(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        if c_ctxt.errNo == xmlerror.XML_ERR_OK:
+            c_ctxt.errNo = xmlerror.XML_ERR_INTERNAL_ERROR
+        # stop parsing immediately
+        c_ctxt.wellFormed = 0
+        c_ctxt.disableSAX = 1
+        c_ctxt.instate = xmlparser.XML_PARSER_EOF
+        self._store_raised()
+
+
+@cython.final
+@cython.internal
+cdef class _ParseEventsIterator:
+    """A reusable parse events iterator"""
+    cdef list _events
+    cdef int _event_index
+
+    def __cinit__(self):
+        self._events = []
+        self._event_index = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        cdef int event_index = self._event_index
+        events = self._events
+        if event_index >= 2**10 or event_index * 2 >= len(events):
+            if event_index:
+                # clean up from time to time
+                del events[:event_index]
+                self._event_index = event_index = 0
+            if event_index >= len(events):
+                raise StopIteration
+        item = events[event_index]
+        self._event_index = event_index + 1
+        return item
+
+
+cdef list _build_prefix_uri_list(_SaxParserContext context, int c_nb_namespaces,
+                                 const_xmlChar** c_namespaces):
+    "Build [(prefix, uri)] list of declared namespaces."
+    cdef int i
+    namespaces = []
+    for i in xrange(c_nb_namespaces):
+        namespaces.append((funicodeOrEmpty(c_namespaces[0]), funicode(c_namespaces[1])))
+        c_namespaces += 2
+    return namespaces
+
+
+cdef void _handleSaxStart(
+        void* ctxt, const_xmlChar* c_localname, const_xmlChar* c_prefix,
+        const_xmlChar* c_namespace, int c_nb_namespaces,
+        const_xmlChar** c_namespaces,
+        int c_nb_attributes, int c_nb_defaulted,
+        const_xmlChar** c_attributes) noexcept with gil:
+    cdef int i
+    cdef size_t c_len
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    cdef int event_filter = context._event_filter
+    try:
+        if (c_nb_namespaces and
+                event_filter & (PARSE_EVENT_FILTER_START_NS |
+                                PARSE_EVENT_FILTER_END_NS)):
+            declared_namespaces = _build_prefix_uri_list(
+                context, c_nb_namespaces, c_namespaces)
+            if event_filter & PARSE_EVENT_FILTER_START_NS:
+                for prefix_uri_tuple in declared_namespaces:
+                    context.events_iterator._events.append(("start-ns", prefix_uri_tuple))
+        else:
+            declared_namespaces = None
+
+        context._origSaxStart(c_ctxt, c_localname, c_prefix, c_namespace,
+                              c_nb_namespaces, c_namespaces, c_nb_attributes,
+                              c_nb_defaulted, c_attributes)
+        if c_ctxt.html:
+            _fixHtmlDictNodeNames(c_ctxt.dict, c_ctxt.node)
+            # The HTML parser in libxml2 reports the missing opening tags when it finds
+            # misplaced ones, but with tag names from C string constants that ignore the
+            # parser dict.  Thus, we need to intern the name ourselves.
+            c_localname = tree.xmlDictLookup(c_ctxt.dict, c_localname, -1)
+            if c_localname is NULL:
+                raise MemoryError()
+
+        if event_filter & PARSE_EVENT_FILTER_END_NS:
+            context._ns_stack.append(declared_namespaces)
+        if event_filter & (PARSE_EVENT_FILTER_END |
+                           PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, c_namespace, c_localname, None)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetStart(
+        void* ctxt, const_xmlChar* c_localname, const_xmlChar* c_prefix,
+        const_xmlChar* c_namespace, int c_nb_namespaces,
+        const_xmlChar** c_namespaces,
+        int c_nb_attributes, int c_nb_defaulted,
+        const_xmlChar** c_attributes) noexcept with gil:
+    cdef int i
+    cdef size_t c_len
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+
+    cdef int event_filter = context._event_filter
+    cdef int sax_event_filter = context._target._sax_event_filter
+    try:
+        if c_nb_namespaces:
+            declared_namespaces = _build_prefix_uri_list(
+                context, c_nb_namespaces, c_namespaces)
+
+            if event_filter & PARSE_EVENT_FILTER_START_NS:
+                for prefix_uri_tuple in declared_namespaces:
+                    context.events_iterator._events.append(("start-ns", prefix_uri_tuple))
+
+            if sax_event_filter & SAX_EVENT_START_NS:
+                for prefix, uri in declared_namespaces:
+                    context._target._handleSaxStartNs(prefix, uri)
+        else:
+            declared_namespaces = None
+
+        if sax_event_filter & SAX_EVENT_START:
+            if c_nb_defaulted > 0:
+                # only add default attributes if we asked for them
+                if c_ctxt.loadsubset & xmlparser.XML_COMPLETE_ATTRS == 0:
+                    c_nb_attributes -= c_nb_defaulted
+            if c_nb_attributes == 0:
+                attrib = IMMUTABLE_EMPTY_MAPPING
+            else:
+                attrib = {}
+                for i in xrange(c_nb_attributes):
+                    name = _namespacedNameFromNsName(
+                        c_attributes[2], c_attributes[0])
+                    if c_attributes[3] is NULL:
+                        value = ''
+                    else:
+                        c_len = c_attributes[4] - c_attributes[3]
+                        value = c_attributes[3][:c_len].decode('utf8')
+                    attrib[name] = value
+                    c_attributes += 5
+
+            nsmap = dict(declared_namespaces) if c_nb_namespaces else IMMUTABLE_EMPTY_MAPPING
+
+            element = _callTargetSaxStart(
+                context, c_ctxt,
+                _namespacedNameFromNsName(c_namespace, c_localname),
+                attrib, nsmap)
+        else:
+            element = None
+
+        if (event_filter & PARSE_EVENT_FILTER_END_NS or
+                sax_event_filter & SAX_EVENT_END_NS):
+            context._ns_stack.append(declared_namespaces)
+        if event_filter & (PARSE_EVENT_FILTER_END |
+                           PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, c_namespace,
+                               c_localname, element)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxStartNoNs(void* ctxt, const_xmlChar* c_name,
+                              const_xmlChar** c_attributes) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        context._origSaxStartNoNs(c_ctxt, c_name, c_attributes)
+        if c_ctxt.html:
+            _fixHtmlDictNodeNames(c_ctxt.dict, c_ctxt.node)
+            # The HTML parser in libxml2 reports the missing opening tags when it finds
+            # misplaced ones, but with tag names from C string constants that ignore the
+            # parser dict.  Thus, we need to intern the name ourselves.
+            c_name = tree.xmlDictLookup(c_ctxt.dict, c_name, -1)
+            if c_name is NULL:
+                raise MemoryError()
+        if context._event_filter & (PARSE_EVENT_FILTER_END |
+                                    PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, NULL, c_name, None)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetStartNoNs(void* ctxt, const_xmlChar* c_name,
+                                    const_xmlChar** c_attributes) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        if c_attributes is NULL:
+            attrib = IMMUTABLE_EMPTY_MAPPING
+        else:
+            attrib = {}
+            while c_attributes[0] is not NULL:
+                name = funicode(c_attributes[0])
+                attrib[name] = funicodeOrEmpty(c_attributes[1])
+                c_attributes += 2
+        element = _callTargetSaxStart(
+            context, c_ctxt, funicode(c_name),
+            attrib, IMMUTABLE_EMPTY_MAPPING)
+        if context._event_filter & (PARSE_EVENT_FILTER_END |
+                                    PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, NULL, c_name, element)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef _callTargetSaxStart(_SaxParserContext context,
+                         xmlparser.xmlParserCtxt* c_ctxt,
+                         tag, attrib, nsmap):
+    element = context._target._handleSaxStart(tag, attrib, nsmap)
+    if element is not None and c_ctxt.input is not NULL:
+        if isinstance(element, _Element):
+            (<_Element>element)._c_node.line = (
+                <unsigned short>c_ctxt.input.line
+                if c_ctxt.input.line < 65535 else 65535)
+    return element
+
+
+cdef int _pushSaxStartEvent(_SaxParserContext context,
+                            xmlparser.xmlParserCtxt* c_ctxt,
+                            const_xmlChar* c_href,
+                            const_xmlChar* c_name, node) except -1:
+    if (context._matcher is None or
+            context._matcher.matchesNsTag(c_href, c_name)):
+        if node is None and context._target is None:
+            assert context._doc is not None
+            node = _elementFactory(context._doc, c_ctxt.node)
+        if context._event_filter & PARSE_EVENT_FILTER_START:
+            context.events_iterator._events.append(('start', node))
+        if (context._target is None and
+                context._event_filter & PARSE_EVENT_FILTER_END):
+            context._node_stack.append(node)
+    return 0
+
+
+cdef void _handleSaxEnd(void* ctxt, const_xmlChar* c_localname,
+                        const_xmlChar* c_prefix,
+                        const_xmlChar* c_namespace) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        if context._target is not None:
+            if context._target._sax_event_filter & SAX_EVENT_END:
+                node = context._target._handleSaxEnd(
+                    _namespacedNameFromNsName(c_namespace, c_localname))
+            else:
+                node = None
+        else:
+            context._origSaxEnd(c_ctxt, c_localname, c_prefix, c_namespace)
+            node = None
+        _pushSaxEndEvent(context, c_namespace, c_localname, node)
+        _pushSaxNsEndEvents(context)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxEndNoNs(void* ctxt, const_xmlChar* c_name) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        if context._target is not None:
+            node = context._target._handleSaxEnd(funicode(c_name))
+        else:
+            context._origSaxEndNoNs(c_ctxt, c_name)
+            node = None
+        _pushSaxEndEvent(context, NULL, c_name, node)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef int _pushSaxNsEndEvents(_SaxParserContext context) except -1:
+    cdef bint build_events = context._event_filter & PARSE_EVENT_FILTER_END_NS
+    cdef bint call_target = (
+        context._target is not None
+        and context._target._sax_event_filter & SAX_EVENT_END_NS)
+    if not build_events and not call_target:
+        return 0
+
+    cdef list declared_namespaces = context._ns_stack.pop()
+    if declared_namespaces is None:
+        return 0
+
+    cdef tuple prefix_uri
+    for prefix_uri in reversed(declared_namespaces):
+        if call_target:
+            context._target._handleSaxEndNs(prefix_uri[0])
+        if build_events:
+            context.events_iterator._events.append(('end-ns', None))
+
+    return 0
+
+
+cdef int _pushSaxEndEvent(_SaxParserContext context,
+                          const_xmlChar* c_href,
+                          const_xmlChar* c_name, node) except -1:
+    if context._event_filter & PARSE_EVENT_FILTER_END:
+        if (context._matcher is None or
+                context._matcher.matchesNsTag(c_href, c_name)):
+            if context._target is None:
+                node = context._node_stack.pop()
+            context.events_iterator._events.append(('end', node))
+    return 0
+
+
+cdef void _handleSaxData(void* ctxt, const_xmlChar* c_data, int data_len) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        context._target._handleSaxData(
+            c_data[:data_len].decode('utf8'))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetDoctype(void* ctxt, const_xmlChar* c_name,
+                                  const_xmlChar* c_public,
+                                  const_xmlChar* c_system) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        context._target._handleSaxDoctype(
+            funicodeOrNone(c_name),
+            funicodeOrNone(c_public),
+            funicodeOrNone(c_system))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxStartDocument(void* ctxt) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    context._origSaxStartDocument(ctxt)
+    c_doc = c_ctxt.myDoc
+    try:
+        context.startDocument(c_doc)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetPI(void* ctxt, const_xmlChar* c_target,
+                             const_xmlChar* c_data) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        pi = context._target._handleSaxPi(
+            funicodeOrNone(c_target),
+            funicodeOrEmpty(c_data))
+        if context._event_filter & PARSE_EVENT_FILTER_PI:
+            context.events_iterator._events.append(('pi', pi))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxPIEvent(void* ctxt, const_xmlChar* target,
+                            const_xmlChar* data) noexcept with gil:
+    # can only be called when collecting pi events
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    context._origSaxPI(ctxt, target, data)
+    c_node = _findLastEventNode(c_ctxt)
+    if c_node is NULL:
+        return
+    try:
+        context.pushEvent('pi', c_node)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetComment(void* ctxt, const_xmlChar* c_data) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        comment = context._target._handleSaxComment(funicodeOrEmpty(c_data))
+        if context._event_filter & PARSE_EVENT_FILTER_COMMENT:
+            context.events_iterator._events.append(('comment', comment))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxComment(void* ctxt, const_xmlChar* text) noexcept with gil:
+    # can only be called when collecting comment events
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    context._origSaxComment(ctxt, text)
+    c_node = _findLastEventNode(c_ctxt)
+    if c_node is NULL:
+        return
+    try:
+        context.pushEvent('comment', c_node)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef inline xmlNode* _findLastEventNode(xmlparser.xmlParserCtxt* c_ctxt):
+    # this mimics what libxml2 creates for comments/PIs
+    if c_ctxt.inSubset == 1:
+        return c_ctxt.myDoc.intSubset.last
+    elif c_ctxt.inSubset == 2:
+        return c_ctxt.myDoc.extSubset.last
+    elif c_ctxt.node is NULL:
+        return c_ctxt.myDoc.last
+    elif c_ctxt.node.type == tree.XML_ELEMENT_NODE:
+        return c_ctxt.node.last
+    else:
+        return c_ctxt.node.next
+
+
+############################################################
+## ET compatible XML tree builder
+############################################################
+
+cdef class TreeBuilder(_SaxParserTarget):
+    """TreeBuilder(self, element_factory=None, parser=None,
+                    comment_factory=None, pi_factory=None,
+                    insert_comments=True, insert_pis=True)
+
+    Parser target that builds a tree from parse event callbacks.
+
+    The factory arguments can be used to influence the creation of
+    elements, comments and processing instructions.
+
+    By default, comments and processing instructions are inserted into
+    the tree, but they can be ignored by passing the respective flags.
+
+    The final tree is returned by the ``close()`` method.
+    """
+    cdef _BaseParser _parser
+    cdef object _factory
+    cdef object _comment_factory
+    cdef object _pi_factory
+    cdef list _data
+    cdef list _element_stack
+    cdef object _element_stack_pop
+    cdef _Element _last # may be None
+    cdef bint _in_tail
+    cdef bint _insert_comments
+    cdef bint _insert_pis
+
+    def __init__(self, *, element_factory=None, parser=None,
+                 comment_factory=None, pi_factory=None,
+                 bint insert_comments=True, bint insert_pis=True):
+        self._sax_event_filter = \
+            SAX_EVENT_START | SAX_EVENT_END | SAX_EVENT_DATA | \
+            SAX_EVENT_PI | SAX_EVENT_COMMENT
+        self._data = [] # data collector
+        self._element_stack = [] # element stack
+        self._element_stack_pop = self._element_stack.pop
+        self._last = None # last element
+        self._in_tail = 0 # true if we're after an end tag
+        self._factory = element_factory
+        self._comment_factory = comment_factory if comment_factory is not None else Comment
+        self._pi_factory = pi_factory if pi_factory is not None else ProcessingInstruction
+        self._insert_comments = insert_comments
+        self._insert_pis = insert_pis
+        self._parser = parser
+
+    @cython.final
+    cdef int _flush(self) except -1:
+        if self._data:
+            if self._last is not None:
+                text = "".join(self._data)
+                if self._in_tail:
+                    assert self._last.tail is None, "internal error (tail)"
+                    self._last.tail = text
+                else:
+                    assert self._last.text is None, "internal error (text)"
+                    self._last.text = text
+            del self._data[:]
+        return 0
+
+    # internal SAX event handlers
+
+    @cython.final
+    cdef _handleSaxStart(self, tag, attrib, nsmap):
+        self._flush()
+        if self._factory is not None:
+            self._last = self._factory(tag, attrib)
+            if self._element_stack:
+                _appendChild(self._element_stack[-1], self._last)
+        elif self._element_stack:
+            self._last = _makeSubElement(
+                self._element_stack[-1], tag, None, None, attrib, nsmap, None)
+        else:
+            self._last = _makeElement(
+                tag, NULL, None, self._parser, None, None, attrib, nsmap, None)
+        self._element_stack.append(self._last)
+        self._in_tail = 0
+        return self._last
+
+    @cython.final
+    cdef _handleSaxEnd(self, tag):
+        self._flush()
+        self._last = self._element_stack_pop()
+        self._in_tail = 1
+        return self._last
+
+    @cython.final
+    cdef int _handleSaxData(self, data) except -1:
+        self._data.append(data)
+
+    @cython.final
+    cdef _handleSaxPi(self, target, data):
+        elem = self._pi_factory(target, data)
+        if self._insert_pis:
+            self._flush()
+            self._last = elem
+            if self._element_stack:
+                _appendChild(self._element_stack[-1], self._last)
+            self._in_tail = 1
+        return self._last
+
+    @cython.final
+    cdef _handleSaxComment(self, comment):
+        elem = self._comment_factory(comment)
+        if self._insert_comments:
+            self._flush()
+            self._last = elem
+            if self._element_stack:
+                _appendChild(self._element_stack[-1], self._last)
+            self._in_tail = 1
+        return elem
+
+    # Python level event handlers
+
+    def close(self):
+        """close(self)
+
+        Flushes the builder buffers, and returns the toplevel document
+        element.  Raises XMLSyntaxError on inconsistencies.
+        """
+        if self._element_stack:
+            raise XMLSyntaxAssertionError("missing end tags")
+        # TODO: this does not necessarily seem like an error case.  Why not just return None?
+        if self._last is None:
+            raise XMLSyntaxAssertionError("missing toplevel element")
+        return self._last
+
+    def data(self, data):
+        """data(self, data)
+
+        Adds text to the current element.  The value should be either an
+        8-bit string containing ASCII text, or a Unicode string.
+        """
+        self._handleSaxData(data)
+
+    def start(self, tag, attrs, nsmap=None):
+        """start(self, tag, attrs, nsmap=None)
+
+        Opens a new element.
+        """
+        if nsmap is None:
+            nsmap = IMMUTABLE_EMPTY_MAPPING
+        return self._handleSaxStart(tag, attrs, nsmap)
+
+    def end(self, tag):
+        """end(self, tag)
+
+        Closes the current element.
+        """
+        element = self._handleSaxEnd(tag)
+        assert self._last.tag == tag,\
+            f"end tag mismatch (expected {self._last.tag}, got {tag})"
+        return element
+
+    def pi(self, target, data=None):
+        """pi(self, target, data=None)
+
+        Creates a processing instruction using the factory, appends it
+        (unless disabled) and returns it.
+        """
+        return self._handleSaxPi(target, data)
+
+    def comment(self, comment):
+        """comment(self, comment)
+
+        Creates a comment using the factory, appends it (unless disabled)
+        and returns it.
+        """
+        return self._handleSaxComment(comment)

llmeval-env/lib/python3.10/site-packages/lxml/serializer.pxi

@@ -0,0 +1,1871 @@
+# XML serialization and output functions
+
+cdef object GzipFile
+from gzip import GzipFile
+
+
+cdef class SerialisationError(LxmlError):
+    """A libxml2 error that occurred during serialisation.
+    """
+
+
+cdef enum _OutputMethods:
+    OUTPUT_METHOD_XML
+    OUTPUT_METHOD_HTML
+    OUTPUT_METHOD_TEXT
+
+
+cdef int _findOutputMethod(method) except -1:
+    if method is None:
+        return OUTPUT_METHOD_XML
+    method = method.lower()
+    if method == "xml":
+        return OUTPUT_METHOD_XML
+    if method == "html":
+        return OUTPUT_METHOD_HTML
+    if method == "text":
+        return OUTPUT_METHOD_TEXT
+    raise ValueError(f"unknown output method {method!r}")
+
+
+cdef _textToString(xmlNode* c_node, encoding, bint with_tail):
+    cdef bint needs_conversion
+    cdef const_xmlChar* c_text
+    cdef xmlNode* c_text_node
+    cdef tree.xmlBuffer* c_buffer
+    cdef int error_result
+
+    c_buffer = tree.xmlBufferCreate()
+    if c_buffer is NULL:
+        raise MemoryError()
+
+    with nogil:
+        error_result = tree.xmlNodeBufGetContent(c_buffer, c_node)
+        if with_tail:
+            c_text_node = _textNodeOrSkip(c_node.next)
+            while c_text_node is not NULL:
+                tree.xmlBufferWriteChar(c_buffer, <const_char*>c_text_node.content)
+                c_text_node = _textNodeOrSkip(c_text_node.next)
+        c_text = tree.xmlBufferContent(c_buffer)
+
+    if error_result < 0 or c_text is NULL:
+        tree.xmlBufferFree(c_buffer)
+        raise SerialisationError, "Error during serialisation (out of memory?)"
+
+    try:
+        needs_conversion = 0
+        if encoding is unicode:
+            needs_conversion = 1
+        elif encoding is not None:
+            # Python prefers lower case encoding names
+            encoding = encoding.lower()
+            if encoding not in ('utf8', 'utf-8'):
+                if encoding == 'ascii':
+                    if isutf8l(c_text, tree.xmlBufferLength(c_buffer)):
+                        # will raise a decode error below
+                        needs_conversion = 1
+                else:
+                    needs_conversion = 1
+
+        if needs_conversion:
+            text = (<const_char*>c_text)[:tree.xmlBufferLength(c_buffer)].decode('utf8')
+            if encoding is not unicode:
+                encoding = _utf8(encoding)
+                text = python.PyUnicode_AsEncodedString(
+                    text, encoding, 'strict')
+        else:
+            text = (<unsigned char*>c_text)[:tree.xmlBufferLength(c_buffer)]
+    finally:
+        tree.xmlBufferFree(c_buffer)
+    return text
+
+
+cdef _tostring(_Element element, encoding, doctype, method,
+               bint write_xml_declaration, bint write_complete_document,
+               bint pretty_print, bint with_tail, int standalone):
+    """Serialize an element to an encoded string representation of its XML
+    tree.
+    """
+    cdef tree.xmlOutputBuffer* c_buffer
+    cdef tree.xmlBuf* c_result_buffer
+    cdef tree.xmlCharEncodingHandler* enchandler
+    cdef const_char* c_enc
+    cdef const_xmlChar* c_version
+    cdef const_xmlChar* c_doctype
+    cdef int c_method
+    cdef int error_result
+    if element is None:
+        return None
+    _assertValidNode(element)
+    c_method = _findOutputMethod(method)
+    if c_method == OUTPUT_METHOD_TEXT:
+        return _textToString(element._c_node, encoding, with_tail)
+    if encoding is None or encoding is unicode:
+        c_enc = NULL
+    else:
+        encoding = _utf8(encoding)
+        c_enc = _cstr(encoding)
+    if doctype is None:
+        c_doctype = NULL
+    else:
+        doctype = _utf8(doctype)
+        c_doctype = _xcstr(doctype)
+    # it is necessary to *and* find the encoding handler *and* use
+    # encoding during output
+    enchandler = tree.xmlFindCharEncodingHandler(c_enc)
+    if enchandler is NULL and c_enc is not NULL:
+        if encoding is not None:
+            encoding = encoding.decode('UTF-8')
+        raise LookupError, f"unknown encoding: '{encoding}'"
+    c_buffer = tree.xmlAllocOutputBuffer(enchandler)
+    if c_buffer is NULL:
+        tree.xmlCharEncCloseFunc(enchandler)
+        raise MemoryError()
+
+    with nogil:
+        _writeNodeToBuffer(c_buffer, element._c_node, c_enc, c_doctype, c_method,
+                           write_xml_declaration, write_complete_document,
+                           pretty_print, with_tail, standalone)
+        tree.xmlOutputBufferFlush(c_buffer)
+        if c_buffer.conv is not NULL:
+            c_result_buffer = c_buffer.conv
+        else:
+            c_result_buffer = c_buffer.buffer
+
+    error_result = c_buffer.error
+    if error_result != xmlerror.XML_ERR_OK:
+        tree.xmlOutputBufferClose(c_buffer)
+        _raiseSerialisationError(error_result)
+
+    try:
+        if encoding is unicode:
+            result = (<unsigned char*>tree.xmlBufContent(
+                c_result_buffer))[:tree.xmlBufUse(c_result_buffer)].decode('UTF-8')
+        else:
+            result = <bytes>(<unsigned char*>tree.xmlBufContent(
+                c_result_buffer))[:tree.xmlBufUse(c_result_buffer)]
+    finally:
+        error_result = tree.xmlOutputBufferClose(c_buffer)
+    if error_result == -1:
+        _raiseSerialisationError(error_result)
+    return result
+
+cdef bytes _tostringC14N(element_or_tree, bint exclusive, bint with_comments, inclusive_ns_prefixes):
+    cdef xmlDoc* c_doc
+    cdef xmlChar* c_buffer = NULL
+    cdef int byte_count = -1
+    cdef bytes result
+    cdef _Document doc
+    cdef _Element element
+    cdef xmlChar **c_inclusive_ns_prefixes
+
+    if isinstance(element_or_tree, _Element):
+        _assertValidNode(<_Element>element_or_tree)
+        doc = (<_Element>element_or_tree)._doc
+        c_doc = _plainFakeRootDoc(doc._c_doc, (<_Element>element_or_tree)._c_node, 0)
+    else:
+        doc = _documentOrRaise(element_or_tree)
+        _assertValidDoc(doc)
+        c_doc = doc._c_doc
+
+    c_inclusive_ns_prefixes = _convert_ns_prefixes(c_doc.dict, inclusive_ns_prefixes) if inclusive_ns_prefixes else NULL
+    try:
+         with nogil:
+             byte_count = c14n.xmlC14NDocDumpMemory(
+                 c_doc, NULL, exclusive, c_inclusive_ns_prefixes, with_comments, &c_buffer)
+
+    finally:
+         _destroyFakeDoc(doc._c_doc, c_doc)
+         if c_inclusive_ns_prefixes is not NULL:
+            python.lxml_free(c_inclusive_ns_prefixes)
+
+    if byte_count < 0 or c_buffer is NULL:
+        if c_buffer is not NULL:
+            tree.xmlFree(c_buffer)
+        raise C14NError, "C14N failed"
+    try:
+        result = c_buffer[:byte_count]
+    finally:
+        tree.xmlFree(c_buffer)
+    return result
+
+cdef _raiseSerialisationError(int error_result):
+    if error_result == xmlerror.XML_ERR_NO_MEMORY:
+        raise MemoryError()
+    message = ErrorTypes._getName(error_result)
+    if message is None:
+        message = f"unknown error {error_result}"
+    raise SerialisationError, message
+
+############################################################
+# low-level serialisation functions
+
+cdef void _writeDoctype(tree.xmlOutputBuffer* c_buffer,
+                        const_xmlChar* c_doctype) noexcept nogil:
+    tree.xmlOutputBufferWrite(c_buffer, tree.xmlStrlen(c_doctype),
+                              <const_char*>c_doctype)
+    tree.xmlOutputBufferWriteString(c_buffer, "\n")
+
+cdef void _writeNodeToBuffer(tree.xmlOutputBuffer* c_buffer,
+                             xmlNode* c_node, const_char* encoding, const_xmlChar* c_doctype,
+                             int c_method, bint write_xml_declaration,
+                             bint write_complete_document,
+                             bint pretty_print, bint with_tail,
+                             int standalone) noexcept nogil:
+    cdef xmlNode* c_nsdecl_node
+    cdef xmlDoc* c_doc = c_node.doc
+    if write_xml_declaration and c_method == OUTPUT_METHOD_XML:
+        _writeDeclarationToBuffer(c_buffer, c_doc.version, encoding, standalone)
+
+    # comments/processing instructions before doctype declaration
+    if write_complete_document and not c_buffer.error and c_doc.intSubset:
+        _writePrevSiblings(c_buffer, <xmlNode*>c_doc.intSubset, encoding, pretty_print)
+
+    if c_doctype:
+        _writeDoctype(c_buffer, c_doctype)
+    # write internal DTD subset, preceding PIs/comments, etc.
+    if write_complete_document and not c_buffer.error:
+        if c_doctype is NULL:
+            _writeDtdToBuffer(c_buffer, c_doc, c_node.name, c_method, encoding)
+        _writePrevSiblings(c_buffer, c_node, encoding, pretty_print)
+
+    c_nsdecl_node = c_node
+    if not c_node.parent or c_node.parent.type != tree.XML_DOCUMENT_NODE:
+        # copy the node and add namespaces from parents
+        # this is required to make libxml write them
+        c_nsdecl_node = tree.xmlCopyNode(c_node, 2)
+        if not c_nsdecl_node:
+            c_buffer.error = xmlerror.XML_ERR_NO_MEMORY
+            return
+        _copyParentNamespaces(c_node, c_nsdecl_node)
+
+        c_nsdecl_node.parent = c_node.parent
+        c_nsdecl_node.children = c_node.children
+        c_nsdecl_node.last = c_node.last
+
+    # write node
+    if c_method == OUTPUT_METHOD_HTML:
+        tree.htmlNodeDumpFormatOutput(
+            c_buffer, c_doc, c_nsdecl_node, encoding, pretty_print)
+    else:
+        tree.xmlNodeDumpOutput(
+            c_buffer, c_doc, c_nsdecl_node, 0, pretty_print, encoding)
+
+    if c_nsdecl_node is not c_node:
+        # clean up
+        c_nsdecl_node.children = c_nsdecl_node.last = NULL
+        tree.xmlFreeNode(c_nsdecl_node)
+
+    if c_buffer.error:
+        return
+
+    # write tail, trailing comments, etc.
+    if with_tail:
+        _writeTail(c_buffer, c_node, encoding, c_method, pretty_print)
+    if write_complete_document:
+        _writeNextSiblings(c_buffer, c_node, encoding, pretty_print)
+    if pretty_print:
+        tree.xmlOutputBufferWrite(c_buffer, 1, "\n")
+
+cdef void _writeDeclarationToBuffer(tree.xmlOutputBuffer* c_buffer,
+                                    const_xmlChar* version, const_char* encoding,
+                                    int standalone) noexcept nogil:
+    if version is NULL:
+        version = <unsigned char*>"1.0"
+    tree.xmlOutputBufferWrite(c_buffer, 15, "<?xml version='")
+    tree.xmlOutputBufferWriteString(c_buffer, <const_char*>version)
+    tree.xmlOutputBufferWrite(c_buffer, 12, "' encoding='")
+    tree.xmlOutputBufferWriteString(c_buffer, encoding)
+    if standalone == 0:
+        tree.xmlOutputBufferWrite(c_buffer, 20, "' standalone='no'?>\n")
+    elif standalone == 1:
+        tree.xmlOutputBufferWrite(c_buffer, 21, "' standalone='yes'?>\n")
+    else:
+        tree.xmlOutputBufferWrite(c_buffer, 4, "'?>\n")
+
+cdef void _writeDtdToBuffer(tree.xmlOutputBuffer* c_buffer,
+                            xmlDoc* c_doc, const_xmlChar* c_root_name,
+                            int c_method, const_char* encoding) noexcept nogil:
+    cdef tree.xmlDtd* c_dtd
+    cdef xmlNode* c_node
+    cdef char* quotechar
+    c_dtd = c_doc.intSubset
+    if not c_dtd or not c_dtd.name:
+        return
+
+    # Name in document type declaration must match the root element tag.
+    # For XML, case sensitive match, for HTML insensitive.
+    if c_method == OUTPUT_METHOD_HTML:
+        if tree.xmlStrcasecmp(c_root_name, c_dtd.name) != 0:
+            return
+    else:
+        if tree.xmlStrcmp(c_root_name, c_dtd.name) != 0:
+            return
+
+    tree.xmlOutputBufferWrite(c_buffer, 10, "<!DOCTYPE ")
+    tree.xmlOutputBufferWriteString(c_buffer, <const_char*>c_dtd.name)
+
+    cdef const_xmlChar* public_id = c_dtd.ExternalID
+    cdef const_xmlChar* sys_url = c_dtd.SystemID
+    if public_id and public_id[0] == b'\0':
+        public_id = NULL
+    if sys_url and sys_url[0] == b'\0':
+        sys_url = NULL
+
+    if public_id:
+        tree.xmlOutputBufferWrite(c_buffer, 9, ' PUBLIC "')
+        tree.xmlOutputBufferWriteString(c_buffer, <const_char*>public_id)
+        if sys_url:
+            tree.xmlOutputBufferWrite(c_buffer, 2, '" ')
+        else:
+            tree.xmlOutputBufferWrite(c_buffer, 1, '"')
+    elif sys_url:
+        tree.xmlOutputBufferWrite(c_buffer, 8, ' SYSTEM ')
+
+    if sys_url:
+        if tree.xmlStrchr(sys_url, b'"'):
+            quotechar = '\''
+        else:
+            quotechar = '"'
+        tree.xmlOutputBufferWrite(c_buffer, 1, quotechar)
+        tree.xmlOutputBufferWriteString(c_buffer, <const_char*>sys_url)
+        tree.xmlOutputBufferWrite(c_buffer, 1, quotechar)
+
+    if (not c_dtd.entities and not c_dtd.elements and
+           not c_dtd.attributes and not c_dtd.notations and
+           not c_dtd.pentities):
+        tree.xmlOutputBufferWrite(c_buffer, 2, '>\n')
+        return
+
+    tree.xmlOutputBufferWrite(c_buffer, 3, ' [\n')
+    if c_dtd.notations and not c_buffer.error:
+        c_buf = tree.xmlBufferCreate()
+        if not c_buf:
+            c_buffer.error = xmlerror.XML_ERR_NO_MEMORY
+            return
+        tree.xmlDumpNotationTable(c_buf, <tree.xmlNotationTable*>c_dtd.notations)
+        tree.xmlOutputBufferWrite(
+            c_buffer, tree.xmlBufferLength(c_buf),
+            <const_char*>tree.xmlBufferContent(c_buf))
+        tree.xmlBufferFree(c_buf)
+    c_node = c_dtd.children
+    while c_node and not c_buffer.error:
+        tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_node, 0, 0, encoding)
+        c_node = c_node.next
+    tree.xmlOutputBufferWrite(c_buffer, 3, "]>\n")
+
+cdef void _writeTail(tree.xmlOutputBuffer* c_buffer, xmlNode* c_node,
+                     const_char* encoding, int c_method, bint pretty_print) noexcept nogil:
+    "Write the element tail."
+    c_node = c_node.next
+    while c_node and not c_buffer.error and c_node.type in (
+            tree.XML_TEXT_NODE, tree.XML_CDATA_SECTION_NODE):
+        if c_method == OUTPUT_METHOD_HTML:
+            tree.htmlNodeDumpFormatOutput(
+                c_buffer, c_node.doc, c_node, encoding, pretty_print)
+        else:
+            tree.xmlNodeDumpOutput(
+                c_buffer, c_node.doc, c_node, 0, pretty_print, encoding)
+        c_node = c_node.next
+
+cdef void _writePrevSiblings(tree.xmlOutputBuffer* c_buffer, xmlNode* c_node,
+                             const_char* encoding, bint pretty_print) noexcept nogil:
+    cdef xmlNode* c_sibling
+    if c_node.parent and _isElement(c_node.parent):
+        return
+    # we are at a root node, so add PI and comment siblings
+    c_sibling = c_node
+    while c_sibling.prev and \
+            (c_sibling.prev.type == tree.XML_PI_NODE or
+             c_sibling.prev.type == tree.XML_COMMENT_NODE):
+        c_sibling = c_sibling.prev
+    while c_sibling is not c_node and not c_buffer.error:
+        tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_sibling, 0,
+                               pretty_print, encoding)
+        if pretty_print:
+            tree.xmlOutputBufferWriteString(c_buffer, "\n")
+        c_sibling = c_sibling.next
+
+cdef void _writeNextSiblings(tree.xmlOutputBuffer* c_buffer, xmlNode* c_node,
+                             const_char* encoding, bint pretty_print) noexcept nogil:
+    cdef xmlNode* c_sibling
+    if c_node.parent and _isElement(c_node.parent):
+        return
+    # we are at a root node, so add PI and comment siblings
+    c_sibling = c_node.next
+    while not c_buffer.error and c_sibling and \
+            (c_sibling.type == tree.XML_PI_NODE or
+             c_sibling.type == tree.XML_COMMENT_NODE):
+        if pretty_print:
+            tree.xmlOutputBufferWriteString(c_buffer, "\n")
+        tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_sibling, 0,
+                               pretty_print, encoding)
+        c_sibling = c_sibling.next
+
+
+# copied and adapted from libxml2
+cdef unsigned char *xmlSerializeHexCharRef(unsigned char *out, int val) noexcept:
+    cdef xmlChar *ptr
+    cdef const xmlChar* hexdigits = b"0123456789ABCDEF"
+
+    out[0] = b'&'
+    out += 1
+    out[0] = b'#'
+    out += 1
+    out[0] = b'x'
+    out += 1
+
+    if val < 0x10:
+        ptr = out
+    elif val < 0x100:
+        ptr = out + 1
+    elif val < 0x1000:
+        ptr = out + 2
+    elif val < 0x10000:
+        ptr = out + 3
+    elif val < 0x100000:
+        ptr = out + 4
+    else:
+        ptr = out + 5
+
+    out = ptr + 1
+    while val > 0:
+        ptr[0] = hexdigits[val & 0xF]
+        ptr -= 1
+        val >>= 4
+
+    out[0] = b';'
+    out += 1
+    out[0] = 0
+
+    return out
+
+
+# copied and adapted from libxml2 (xmlBufAttrSerializeTxtContent())
+cdef _write_attr_string(tree.xmlOutputBuffer* buf, const char *string):
+    cdef const char *base
+    cdef const char *cur
+    cdef const unsigned char *ucur
+
+    cdef unsigned char tmp[12]
+    cdef int val = 0
+    cdef int l
+
+    if string == NULL:
+        return
+
+    base = cur = <const char*>string
+    while cur[0] != 0:
+        if cur[0] == b'\n':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 5, "&#10;")
+            cur += 1
+            base = cur
+
+        elif cur[0] == b'\r':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 5, "&#13;")
+            cur += 1
+            base = cur
+
+        elif cur[0] == b'\t':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 4, "&#9;")
+            cur += 1
+            base = cur
+
+        elif cur[0] == b'"':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 6, "&quot;")
+            cur += 1
+            base = cur
+
+        elif cur[0] == b'<':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 4, "&lt;")
+            cur += 1
+            base = cur
+
+        elif cur[0] == b'>':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 4, "&gt;")
+            cur += 1
+            base = cur
+        elif cur[0] == b'&':
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            tree.xmlOutputBufferWrite(buf, 5, "&amp;")
+            cur += 1
+            base = cur
+
+        elif (<const unsigned char>cur[0] >= 0x80) and (cur[1] != 0):
+
+            if base != cur:
+                tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+            ucur = <const unsigned char *>cur
+
+            if ucur[0] < 0xC0:
+                # invalid UTF-8 sequence
+                val = ucur[0]
+                l = 1
+
+            elif ucur[0] < 0xE0:
+                val = (ucur[0]) & 0x1F
+                val <<= 6
+                val |= (ucur[1]) & 0x3F
+                l = 2
+
+            elif (ucur[0] < 0xF0) and (ucur[2] != 0):
+                val = (ucur[0]) & 0x0F
+                val <<= 6
+                val |= (ucur[1]) & 0x3F
+                val <<= 6
+                val |= (ucur[2]) & 0x3F
+                l = 3
+
+            elif (ucur[0] < 0xF8) and (ucur[2] != 0) and (ucur[3] != 0):
+                val = (ucur[0]) & 0x07
+                val <<= 6
+                val |= (ucur[1]) & 0x3F
+                val <<= 6
+                val |= (ucur[2]) & 0x3F
+                val <<= 6
+                val |= (ucur[3]) & 0x3F
+                l = 4
+            else:
+                # invalid UTF-8 sequence
+                val = ucur[0]
+                l = 1
+
+            if (l == 1) or (not tree.xmlIsCharQ(val)):
+                raise ValueError(f"Invalid character: {val:X}")
+
+            # We could do multiple things here. Just save
+            # as a char ref
+            xmlSerializeHexCharRef(tmp, val)
+            tree.xmlOutputBufferWrite(buf, len(tmp), <const char*> tmp)
+            cur += l
+            base = cur
+
+        else:
+            cur += 1
+
+    if base != cur:
+        tree.xmlOutputBufferWrite(buf, cur - base, base)
+
+
+############################################################
+# output to file-like objects
+
+cdef object io_open
+from io import open
+
+cdef object gzip
+import gzip
+
+cdef object getwriter
+from codecs import getwriter
+cdef object utf8_writer = getwriter('utf8')
+
+cdef object contextmanager
+from contextlib import contextmanager
+
+cdef object _open_utf8_file
+
+@contextmanager
+def _open_utf8_file(file, compression=0):
+    file = _getFSPathOrObject(file)
+    if _isString(file):
+        if compression:
+            with gzip.GzipFile(file, mode='wb', compresslevel=compression) as zf:
+                yield utf8_writer(zf)
+        else:
+            with io_open(file, 'w', encoding='utf8') as f:
+                yield f
+    else:
+        if compression:
+            with gzip.GzipFile(fileobj=file, mode='wb', compresslevel=compression) as zf:
+                yield utf8_writer(zf)
+        else:
+            yield utf8_writer(file)
+
+
+@cython.final
+@cython.internal
+cdef class _FilelikeWriter:
+    cdef object _filelike
+    cdef object _close_filelike
+    cdef _ExceptionContext _exc_context
+    cdef _ErrorLog error_log
+    def __cinit__(self, filelike, exc_context=None, compression=None, close=False):
+        if compression is not None and compression > 0:
+            filelike = GzipFile(
+                fileobj=filelike, mode='wb', compresslevel=compression)
+            self._close_filelike = filelike.close
+        elif close:
+            self._close_filelike = filelike.close
+        self._filelike = filelike
+        if exc_context is None:
+            self._exc_context = _ExceptionContext()
+        else:
+            self._exc_context = exc_context
+        self.error_log = _ErrorLog()
+
+    cdef tree.xmlOutputBuffer* _createOutputBuffer(
+        self, tree.xmlCharEncodingHandler* enchandler) except NULL:
+        cdef tree.xmlOutputBuffer* c_buffer
+        c_buffer = tree.xmlOutputBufferCreateIO(
+            <tree.xmlOutputWriteCallback>_writeFilelikeWriter, _closeFilelikeWriter,
+            <python.PyObject*>self, enchandler)
+        if c_buffer is NULL:
+            raise IOError, "Could not create I/O writer context."
+        return c_buffer
+
+    cdef int write(self, char* c_buffer, int size) noexcept:
+        try:
+            if self._filelike is None:
+                raise IOError, "File is already closed"
+            py_buffer = <bytes>c_buffer[:size]
+            self._filelike.write(py_buffer)
+        except:
+            size = -1
+            self._exc_context._store_raised()
+        finally:
+            return size  # and swallow any further exceptions
+
+    cdef int close(self) noexcept:
+        retval = 0
+        try:
+            if self._close_filelike is not None:
+                self._close_filelike()
+            # we should not close the file here as we didn't open it
+            self._filelike = None
+        except:
+            retval = -1
+            self._exc_context._store_raised()
+        finally:
+            return retval  # and swallow any further exceptions
+
+cdef int _writeFilelikeWriter(void* ctxt, char* c_buffer, int length) noexcept:
+    return (<_FilelikeWriter>ctxt).write(c_buffer, length)
+
+cdef int _closeFilelikeWriter(void* ctxt) noexcept:
+    return (<_FilelikeWriter>ctxt).close()
+
+cdef _tofilelike(f, _Element element, encoding, doctype, method,
+                 bint write_xml_declaration, bint write_doctype,
+                 bint pretty_print, bint with_tail, int standalone,
+                 int compression):
+    cdef _FilelikeWriter writer = None
+    cdef tree.xmlOutputBuffer* c_buffer
+    cdef tree.xmlCharEncodingHandler* enchandler
+    cdef const_char* c_enc
+    cdef const_xmlChar* c_doctype
+    cdef int error_result
+
+    c_method = _findOutputMethod(method)
+    if c_method == OUTPUT_METHOD_TEXT:
+        data = _textToString(element._c_node, encoding, with_tail)
+        if compression:
+            bytes_out = BytesIO()
+            with GzipFile(fileobj=bytes_out, mode='wb', compresslevel=compression) as gzip_file:
+                gzip_file.write(data)
+            data = bytes_out.getvalue()
+        f = _getFSPathOrObject(f)
+        if _isString(f):
+            filename8 = _encodeFilename(f)
+            with open(filename8, 'wb') as f:
+                f.write(data)
+        else:
+            f.write(data)
+        return
+
+    if encoding is None:
+        c_enc = NULL
+    else:
+        encoding = _utf8(encoding)
+        c_enc = _cstr(encoding)
+    if doctype is None:
+        c_doctype = NULL
+    else:
+        doctype = _utf8(doctype)
+        c_doctype = _xcstr(doctype)
+
+    writer = _create_output_buffer(f, c_enc, compression, &c_buffer, close=False)
+    if writer is None:
+        with nogil:
+            error_result = _serialise_node(
+                c_buffer, c_doctype, c_enc, element._c_node, c_method,
+                write_xml_declaration, write_doctype, pretty_print, with_tail, standalone)
+    else:
+        error_result = _serialise_node(
+            c_buffer, c_doctype, c_enc, element._c_node, c_method,
+            write_xml_declaration, write_doctype, pretty_print, with_tail, standalone)
+
+    if writer is not None:
+        writer._exc_context._raise_if_stored()
+    if error_result != xmlerror.XML_ERR_OK:
+        _raiseSerialisationError(error_result)
+
+
+cdef int _serialise_node(tree.xmlOutputBuffer* c_buffer, const_xmlChar* c_doctype,
+                         const_char* c_enc, xmlNode* c_node, int c_method,
+                         bint write_xml_declaration, bint write_doctype, bint pretty_print,
+                         bint with_tail, int standalone) noexcept nogil:
+    _writeNodeToBuffer(
+        c_buffer, c_node, c_enc, c_doctype, c_method,
+        write_xml_declaration, write_doctype, pretty_print, with_tail, standalone)
+    error_result = c_buffer.error
+    if error_result == xmlerror.XML_ERR_OK:
+        error_result = tree.xmlOutputBufferClose(c_buffer)
+        if error_result != -1:
+            error_result = xmlerror.XML_ERR_OK
+    else:
+        tree.xmlOutputBufferClose(c_buffer)
+    return error_result
+
+
+cdef _FilelikeWriter _create_output_buffer(
+        f, const_char* c_enc, int c_compression,
+        tree.xmlOutputBuffer** c_buffer_ret, bint close):
+    cdef tree.xmlOutputBuffer* c_buffer
+    cdef _FilelikeWriter writer
+    cdef bytes filename8
+    enchandler = tree.xmlFindCharEncodingHandler(c_enc)
+    if enchandler is NULL:
+        raise LookupError(
+            f"unknown encoding: '{c_enc.decode('UTF-8') if c_enc is not NULL else u''}'")
+    try:
+        f = _getFSPathOrObject(f)
+        if _isString(f):
+            filename8 = _encodeFilename(f)
+            if b'%' in filename8 and (
+                    # Exclude absolute Windows paths and file:// URLs.
+                    _isFilePath(<const xmlChar*>filename8) not in (NO_FILE_PATH, ABS_WIN_FILE_PATH)
+                    or filename8[:7].lower() == b'file://'):
+                # A file path (not a URL) containing the '%' URL escape character.
+                # libxml2 uses URL-unescaping on these, so escape the path before passing it in.
+                filename8 = filename8.replace(b'%', b'%25')
+            c_buffer = tree.xmlOutputBufferCreateFilename(
+                _cstr(filename8), enchandler, c_compression)
+            if c_buffer is NULL:
+                python.PyErr_SetFromErrno(IOError)  # raises IOError
+            writer = None
+        elif hasattr(f, 'write'):
+            writer = _FilelikeWriter(f, compression=c_compression, close=close)
+            c_buffer = writer._createOutputBuffer(enchandler)
+        else:
+            raise TypeError(
+                f"File or filename expected, got '{python._fqtypename(f).decode('UTF-8')}'")
+    except:
+        tree.xmlCharEncCloseFunc(enchandler)
+        raise
+    c_buffer_ret[0] = c_buffer
+    return writer
+
+cdef xmlChar **_convert_ns_prefixes(tree.xmlDict* c_dict, ns_prefixes) except NULL:
+    cdef size_t i, num_ns_prefixes = len(ns_prefixes)
+    # Need to allocate one extra memory block to handle last NULL entry
+    c_ns_prefixes = <xmlChar **>python.lxml_malloc(num_ns_prefixes + 1, sizeof(xmlChar*))
+    if not c_ns_prefixes:
+        raise MemoryError()
+    i = 0
+    try:
+        for prefix in ns_prefixes:
+             prefix_utf = _utf8(prefix)
+             c_prefix = tree.xmlDictExists(c_dict, _xcstr(prefix_utf), len(prefix_utf))
+             if c_prefix:
+                 # unknown prefixes do not need to get serialised
+                 c_ns_prefixes[i] = <xmlChar*>c_prefix
+                 i += 1
+    except:
+        python.lxml_free(c_ns_prefixes)
+        raise
+
+    c_ns_prefixes[i] = NULL  # append end marker
+    return c_ns_prefixes
+
+cdef _tofilelikeC14N(f, _Element element, bint exclusive, bint with_comments,
+                     int compression, inclusive_ns_prefixes):
+    cdef _FilelikeWriter writer = None
+    cdef tree.xmlOutputBuffer* c_buffer
+    cdef xmlChar **c_inclusive_ns_prefixes = NULL
+    cdef char* c_filename
+    cdef xmlDoc* c_base_doc
+    cdef xmlDoc* c_doc
+    cdef int bytes_count, error = 0
+
+    c_base_doc = element._c_node.doc
+    c_doc = _fakeRootDoc(c_base_doc, element._c_node)
+    try:
+        c_inclusive_ns_prefixes = (
+            _convert_ns_prefixes(c_doc.dict, inclusive_ns_prefixes)
+            if inclusive_ns_prefixes else NULL)
+
+        f = _getFSPathOrObject(f)
+        if _isString(f):
+            filename8 = _encodeFilename(f)
+            c_filename = _cstr(filename8)
+            with nogil:
+                error = c14n.xmlC14NDocSave(
+                    c_doc, NULL, exclusive, c_inclusive_ns_prefixes,
+                    with_comments, c_filename, compression)
+        elif hasattr(f, 'write'):
+            writer   = _FilelikeWriter(f, compression=compression)
+            c_buffer = writer._createOutputBuffer(NULL)
+            try:
+                with writer.error_log:
+                    bytes_count = c14n.xmlC14NDocSaveTo(
+                        c_doc, NULL, exclusive, c_inclusive_ns_prefixes,
+                        with_comments, c_buffer)
+            finally:
+                error = tree.xmlOutputBufferClose(c_buffer)
+            if bytes_count < 0:
+                error = bytes_count
+            elif error != -1:
+                error = xmlerror.XML_ERR_OK
+        else:
+            raise TypeError(f"File or filename expected, got '{python._fqtypename(f).decode('UTF-8')}'")
+    finally:
+        _destroyFakeDoc(c_base_doc, c_doc)
+        if c_inclusive_ns_prefixes is not NULL:
+            python.lxml_free(c_inclusive_ns_prefixes)
+
+    if writer is not None:
+        writer._exc_context._raise_if_stored()
+
+    if error < 0:
+        message = "C14N failed"
+        if writer is not None:
+            errors = writer.error_log
+            if len(errors):
+                message = errors[0].message
+        raise C14NError(message)
+
+
+# C14N 2.0
+
+def canonicalize(xml_data=None, *, out=None, from_file=None, **options):
+    """Convert XML to its C14N 2.0 serialised form.
+
+    If *out* is provided, it must be a file or file-like object that receives
+    the serialised canonical XML output (text, not bytes) through its ``.write()``
+    method.  To write to a file, open it in text mode with encoding "utf-8".
+    If *out* is not provided, this function returns the output as text string.
+
+    Either *xml_data* (an XML string, tree or Element) or *file*
+    (a file path or file-like object) must be provided as input.
+
+    The configuration options are the same as for the ``C14NWriterTarget``.
+    """
+    if xml_data is None and from_file is None:
+        raise ValueError("Either 'xml_data' or 'from_file' must be provided as input")
+
+    sio = None
+    if out is None:
+        sio = out = StringIO()
+
+    target = C14NWriterTarget(out.write, **options)
+
+    if xml_data is not None and not isinstance(xml_data, basestring):
+        _tree_to_target(xml_data, target)
+        return sio.getvalue() if sio is not None else None
+
+    cdef _FeedParser parser = XMLParser(
+        target=target,
+        attribute_defaults=True,
+        collect_ids=False,
+    )
+
+    if xml_data is not None:
+        parser.feed(xml_data)
+        parser.close()
+    elif from_file is not None:
+        try:
+            _parseDocument(from_file, parser, base_url=None)
+        except _TargetParserResult:
+            pass
+
+    return sio.getvalue() if sio is not None else None
+
+
+cdef _tree_to_target(element, target):
+    for event, elem in iterwalk(element, events=('start', 'end', 'start-ns', 'comment', 'pi')):
+        text = None
+        if event == 'start':
+            target.start(elem.tag, elem.attrib)
+            text = elem.text
+        elif event == 'end':
+            target.end(elem.tag)
+            text = elem.tail
+        elif event == 'start-ns':
+            target.start_ns(*elem)
+            continue
+        elif event == 'comment':
+            target.comment(elem.text)
+            text = elem.tail
+        elif event == 'pi':
+            target.pi(elem.target, elem.text)
+            text = elem.tail
+        if text:
+            target.data(text)
+    return target.close()
+
+
+cdef object _looks_like_prefix_name = re.compile(r'^\w+:\w+$', re.UNICODE).match
+
+
+cdef class C14NWriterTarget:
+    """
+    Canonicalization writer target for the XMLParser.
+
+    Serialises parse events to XML C14N 2.0.
+
+    Configuration options:
+
+    - *with_comments*: set to true to include comments
+    - *strip_text*: set to true to strip whitespace before and after text content
+    - *rewrite_prefixes*: set to true to replace namespace prefixes by "n{number}"
+    - *qname_aware_tags*: a set of qname aware tag names in which prefixes
+                          should be replaced in text content
+    - *qname_aware_attrs*: a set of qname aware attribute names in which prefixes
+                           should be replaced in text content
+    - *exclude_attrs*: a set of attribute names that should not be serialised
+    - *exclude_tags*: a set of tag names that should not be serialised
+    """
+    cdef object _write
+    cdef list _data
+    cdef set _qname_aware_tags
+    cdef object _find_qname_aware_attrs
+    cdef list _declared_ns_stack
+    cdef list _ns_stack
+    cdef dict _prefix_map
+    cdef list _preserve_space
+    cdef tuple _pending_start
+    cdef set _exclude_tags
+    cdef set _exclude_attrs
+    cdef Py_ssize_t _ignored_depth
+    cdef bint _with_comments
+    cdef bint _strip_text
+    cdef bint _rewrite_prefixes
+    cdef bint _root_seen
+    cdef bint _root_done
+
+    def __init__(self, write, *,
+                 with_comments=False, strip_text=False, rewrite_prefixes=False,
+                 qname_aware_tags=None, qname_aware_attrs=None,
+                 exclude_attrs=None, exclude_tags=None):
+        self._write = write
+        self._data = []
+        self._with_comments = with_comments
+        self._strip_text = strip_text
+        self._exclude_attrs = set(exclude_attrs) if exclude_attrs else None
+        self._exclude_tags = set(exclude_tags) if exclude_tags else None
+
+        self._rewrite_prefixes = rewrite_prefixes
+        if qname_aware_tags:
+            self._qname_aware_tags = set(qname_aware_tags)
+        else:
+            self._qname_aware_tags = None
+        if qname_aware_attrs:
+            self._find_qname_aware_attrs = set(qname_aware_attrs).intersection
+        else:
+            self._find_qname_aware_attrs = None
+
+        # Stack with globally and newly declared namespaces as (uri, prefix) pairs.
+        self._declared_ns_stack = [[
+            ("http://www.w3.org/XML/1998/namespace", "xml"),
+        ]]
+        # Stack with user declared namespace prefixes as (uri, prefix) pairs.
+        self._ns_stack = []
+        if not rewrite_prefixes:
+            self._ns_stack.append(_DEFAULT_NAMESPACE_PREFIXES_ITEMS)
+        self._ns_stack.append([])
+        self._prefix_map = {}
+        self._preserve_space = [False]
+        self._pending_start = None
+        self._ignored_depth = 0
+        self._root_seen = False
+        self._root_done = False
+
+    def _iter_namespaces(self, ns_stack):
+        for namespaces in reversed(ns_stack):
+            if namespaces:  # almost no element declares new namespaces
+                yield from namespaces
+
+    cdef _resolve_prefix_name(self, prefixed_name):
+        prefix, name = prefixed_name.split(':', 1)
+        for uri, p in self._iter_namespaces(self._ns_stack):
+            if p == prefix:
+                return f'{{{uri}}}{name}'
+        raise ValueError(f'Prefix {prefix} of QName "{prefixed_name}" is not declared in scope')
+
+    cdef _qname(self, qname, uri=None):
+        if uri is None:
+            uri, tag = qname[1:].rsplit('}', 1) if qname[:1] == '{' else ('', qname)
+        else:
+            tag = qname
+
+        prefixes_seen = set()
+        for u, prefix in self._iter_namespaces(self._declared_ns_stack):
+            if u == uri and prefix not in prefixes_seen:
+                return f'{prefix}:{tag}' if prefix else tag, tag, uri
+            prefixes_seen.add(prefix)
+
+        # Not declared yet => add new declaration.
+        if self._rewrite_prefixes:
+            if uri in self._prefix_map:
+                prefix = self._prefix_map[uri]
+            else:
+                prefix = self._prefix_map[uri] = f'n{len(self._prefix_map)}'
+            self._declared_ns_stack[-1].append((uri, prefix))
+            return f'{prefix}:{tag}', tag, uri
+
+        if not uri and '' not in prefixes_seen:
+            # No default namespace declared => no prefix needed.
+            return tag, tag, uri
+
+        for u, prefix in self._iter_namespaces(self._ns_stack):
+            if u == uri:
+                self._declared_ns_stack[-1].append((uri, prefix))
+                return f'{prefix}:{tag}' if prefix else tag, tag, uri
+
+        if not uri:
+            # As soon as a default namespace is defined,
+            # anything that has no namespace (and thus, no prefix) goes there.
+            return tag, tag, uri
+
+        raise ValueError(f'Namespace "{uri}" of name "{tag}" is not declared in scope')
+
+    def data(self, data):
+        if not self._ignored_depth:
+            self._data.append(data)
+
+    cdef _flush(self):
+        cdef unicode data = ''.join(self._data)
+        del self._data[:]
+        if self._strip_text and not self._preserve_space[-1]:
+            data = data.strip()
+        if self._pending_start is not None:
+            (tag, attrs, new_namespaces), self._pending_start = self._pending_start, None
+            qname_text = data if ':' in data and _looks_like_prefix_name(data) else None
+            self._start(tag, attrs, new_namespaces, qname_text)
+            if qname_text is not None:
+                return
+        if data and self._root_seen:
+            self._write(_escape_cdata_c14n(data))
+
+    def start_ns(self, prefix, uri):
+        if self._ignored_depth:
+            return
+        # we may have to resolve qnames in text content
+        if self._data:
+            self._flush()
+        self._ns_stack[-1].append((uri, prefix))
+
+    def start(self, tag, attrs):
+        if self._exclude_tags is not None and (
+                self._ignored_depth or tag in self._exclude_tags):
+            self._ignored_depth += 1
+            return
+        if self._data:
+            self._flush()
+
+        new_namespaces = []
+        self._declared_ns_stack.append(new_namespaces)
+
+        if self._qname_aware_tags is not None and tag in self._qname_aware_tags:
+            # Need to parse text first to see if it requires a prefix declaration.
+            self._pending_start = (tag, attrs, new_namespaces)
+            return
+        self._start(tag, attrs, new_namespaces)
+
+    cdef _start(self, tag, attrs, new_namespaces, qname_text=None):
+        if self._exclude_attrs is not None and attrs:
+            attrs = {k: v for k, v in attrs.items() if k not in self._exclude_attrs}
+
+        qnames = {tag, *attrs}
+        resolved_names = {}
+
+        # Resolve prefixes in attribute and tag text.
+        if qname_text is not None:
+            qname = resolved_names[qname_text] = self._resolve_prefix_name(qname_text)
+            qnames.add(qname)
+        if self._find_qname_aware_attrs is not None and attrs:
+            qattrs = self._find_qname_aware_attrs(attrs)
+            if qattrs:
+                for attr_name in qattrs:
+                    value = attrs[attr_name]
+                    if _looks_like_prefix_name(value):
+                        qname = resolved_names[value] = self._resolve_prefix_name(value)
+                        qnames.add(qname)
+            else:
+                qattrs = None
+        else:
+            qattrs = None
+
+        # Assign prefixes in lexicographical order of used URIs.
+        parsed_qnames = {n: self._qname(n) for n in sorted(
+            qnames, key=lambda n: n.split('}', 1))}
+
+        # Write namespace declarations in prefix order ...
+        if new_namespaces:
+            attr_list = [
+                ('xmlns:' + prefix if prefix else 'xmlns', uri)
+                for uri, prefix in new_namespaces
+            ]
+            attr_list.sort()
+        else:
+            # almost always empty
+            attr_list = []
+
+        # ... followed by attributes in URI+name order
+        if attrs:
+            for k, v in sorted(attrs.items()):
+                if qattrs is not None and k in qattrs and v in resolved_names:
+                    v = parsed_qnames[resolved_names[v]][0]
+                attr_qname, attr_name, uri = parsed_qnames[k]
+                # No prefix for attributes in default ('') namespace.
+                attr_list.append((attr_qname if uri else attr_name, v))
+
+        # Honour xml:space attributes.
+        space_behaviour = attrs.get('{http://www.w3.org/XML/1998/namespace}space')
+        self._preserve_space.append(
+            space_behaviour == 'preserve' if space_behaviour
+            else self._preserve_space[-1])
+
+        # Write the tag.
+        write = self._write
+        write('<' + parsed_qnames[tag][0])
+        if attr_list:
+            write(''.join([f' {k}="{_escape_attrib_c14n(v)}"' for k, v in attr_list]))
+        write('>')
+
+        # Write the resolved qname text content.
+        if qname_text is not None:
+            write(_escape_cdata_c14n(parsed_qnames[resolved_names[qname_text]][0]))
+
+        self._root_seen = True
+        self._ns_stack.append([])
+
+    def end(self, tag):
+        if self._ignored_depth:
+            self._ignored_depth -= 1
+            return
+        if self._data:
+            self._flush()
+        self._write(f'</{self._qname(tag)[0]}>')
+        self._preserve_space.pop()
+        self._root_done = len(self._preserve_space) == 1
+        self._declared_ns_stack.pop()
+        self._ns_stack.pop()
+
+    def comment(self, text):
+        if not self._with_comments:
+            return
+        if self._ignored_depth:
+            return
+        if self._root_done:
+            self._write('\n')
+        elif self._root_seen and self._data:
+            self._flush()
+        self._write(f'<!--{_escape_cdata_c14n(text)}-->')
+        if not self._root_seen:
+            self._write('\n')
+
+    def pi(self, target, data):
+        if self._ignored_depth:
+            return
+        if self._root_done:
+            self._write('\n')
+        elif self._root_seen and self._data:
+            self._flush()
+        self._write(
+            f'<?{target} {_escape_cdata_c14n(data)}?>' if data else f'<?{target}?>')
+        if not self._root_seen:
+            self._write('\n')
+
+    def close(self):
+        return None
+
+
+cdef _raise_serialization_error(text):
+    raise TypeError("cannot serialize %r (type %s)" % (text, type(text).__name__))
+
+
+cdef unicode _escape_cdata_c14n(stext):
+    # escape character data
+    cdef unicode text
+    cdef Py_UCS4 ch
+    cdef Py_ssize_t start = 0, pos = 0
+    cdef list substrings = None
+    try:
+        text = unicode(stext)
+    except (TypeError, AttributeError):
+        return _raise_serialization_error(stext)
+
+    for pos, ch in enumerate(text):
+        if ch == '&':
+            escape = '&amp;'
+        elif ch == '<':
+            escape = '&lt;'
+        elif ch == '>':
+            escape = '&gt;'
+        elif ch == '\r':
+            escape = '&#xD;'
+        else:
+            continue
+
+        if substrings is None:
+            substrings = []
+        if pos > start:
+            substrings.append(text[start:pos])
+        substrings.append(escape)
+        start = pos + 1
+
+    if substrings is None:
+        return text
+    if pos >= start:
+        substrings.append(text[start:pos+1])
+    return ''.join(substrings)
+
+
+cdef unicode _escape_attrib_c14n(stext):
+    # escape attribute value
+    cdef unicode text
+    cdef Py_UCS4 ch
+    cdef Py_ssize_t start = 0, pos = 0
+    cdef list substrings = None
+    try:
+        text = unicode(stext)
+    except (TypeError, AttributeError):
+        return _raise_serialization_error(stext)
+
+    for pos, ch in enumerate(text):
+        if ch == '&':
+            escape = '&amp;'
+        elif ch == '<':
+            escape = '&lt;'
+        elif ch == '"':
+            escape = '&quot;'
+        elif ch == '\t':
+            escape = '&#x9;'
+        elif ch == '\n':
+            escape = '&#xA;'
+        elif ch == '\r':
+            escape = '&#xD;'
+        else:
+            continue
+
+        if substrings is None:
+            substrings = []
+        if pos > start:
+            substrings.append(text[start:pos])
+        substrings.append(escape)
+        start = pos + 1
+
+    if substrings is None:
+        return text
+    if pos >= start:
+        substrings.append(text[start:pos+1])
+    return ''.join(substrings)
+
+
+# incremental serialisation
+
+cdef class xmlfile:
+    """xmlfile(self, output_file, encoding=None, compression=None, close=False, buffered=True)
+
+    A simple mechanism for incremental XML serialisation.
+
+    Usage example::
+
+         with xmlfile("somefile.xml", encoding='utf-8') as xf:
+             xf.write_declaration(standalone=True)
+             xf.write_doctype('<!DOCTYPE root SYSTEM "some.dtd">')
+
+             # generate an element (the root element)
+             with xf.element('root'):
+                  # write a complete Element into the open root element
+                  xf.write(etree.Element('test'))
+
+                  # generate and write more Elements, e.g. through iterparse
+                  for element in generate_some_elements():
+                      # serialise generated elements into the XML file
+                      xf.write(element)
+
+                  # or write multiple Elements or strings at once
+                  xf.write(etree.Element('start'), "text", etree.Element('end'))
+
+    If 'output_file' is a file(-like) object, passing ``close=True`` will
+    close it when exiting the context manager.  By default, it is left
+    to the owner to do that.  When a file path is used, lxml will take care
+    of opening and closing the file itself.  Also, when a compression level
+    is set, lxml will deliberately close the file to make sure all data gets
+    compressed and written.
+
+    Setting ``buffered=False`` will flush the output after each operation,
+    such as opening or closing an ``xf.element()`` block or calling
+    ``xf.write()``.  Alternatively, calling ``xf.flush()`` can be used to
+    explicitly flush any pending output when buffering is enabled.
+    """
+    cdef object output_file
+    cdef bytes encoding
+    cdef _IncrementalFileWriter writer
+    cdef _AsyncIncrementalFileWriter async_writer
+    cdef int compresslevel
+    cdef bint close
+    cdef bint buffered
+    cdef int method
+
+    def __init__(self, output_file not None, encoding=None, compression=None,
+                 close=False, buffered=True):
+        self.output_file = output_file
+        self.encoding = _utf8orNone(encoding)
+        self.compresslevel = compression or 0
+        self.close = close
+        self.buffered = buffered
+        self.method = OUTPUT_METHOD_XML
+
+    def __enter__(self):
+        assert self.output_file is not None
+        self.writer = _IncrementalFileWriter(
+            self.output_file, self.encoding, self.compresslevel,
+            self.close, self.buffered, self.method)
+        return self.writer
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        if self.writer is not None:
+            old_writer, self.writer = self.writer, None
+            raise_on_error = exc_type is None
+            old_writer._close(raise_on_error)
+            if self.close:
+                self.output_file = None
+
+    async def __aenter__(self):
+        assert self.output_file is not None
+        if isinstance(self.output_file, basestring):
+            raise TypeError("Cannot asynchronously write to a plain file")
+        if not hasattr(self.output_file, 'write'):
+            raise TypeError("Output file needs an async .write() method")
+        self.async_writer = _AsyncIncrementalFileWriter(
+            self.output_file, self.encoding, self.compresslevel,
+            self.close, self.buffered, self.method)
+        return self.async_writer
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        if self.async_writer is not None:
+            old_writer, self.async_writer = self.async_writer, None
+            raise_on_error = exc_type is None
+            await old_writer._close(raise_on_error)
+            if self.close:
+                self.output_file = None
+
+
+cdef class htmlfile(xmlfile):
+    """htmlfile(self, output_file, encoding=None, compression=None, close=False, buffered=True)
+
+    A simple mechanism for incremental HTML serialisation.  Works the same as
+    xmlfile.
+    """
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.method = OUTPUT_METHOD_HTML
+
+
+cdef enum _IncrementalFileWriterStatus:
+    WRITER_STARTING = 0
+    WRITER_DECL_WRITTEN = 1
+    WRITER_DTD_WRITTEN = 2
+    WRITER_IN_ELEMENT = 3
+    WRITER_FINISHED = 4
+
+
+@cython.final
+@cython.internal
+cdef class _IncrementalFileWriter:
+    cdef tree.xmlOutputBuffer* _c_out
+    cdef bytes _encoding
+    cdef const_char* _c_encoding
+    cdef _FilelikeWriter _target
+    cdef list _element_stack
+    cdef int _status
+    cdef int _method
+    cdef bint _buffered
+
+    def __cinit__(self, outfile, bytes encoding, int compresslevel, bint close,
+                  bint buffered, int method):
+        self._status = WRITER_STARTING
+        self._element_stack = []
+        if encoding is None:
+            encoding = b'ASCII'
+        self._encoding = encoding
+        self._c_encoding = _cstr(encoding) if encoding is not None else NULL
+        self._buffered = buffered
+        self._target = _create_output_buffer(
+            outfile, self._c_encoding, compresslevel, &self._c_out, close)
+        self._method = method
+
+    def __dealloc__(self):
+        if self._c_out is not NULL:
+            tree.xmlOutputBufferClose(self._c_out)
+
+    def write_declaration(self, version=None, standalone=None, doctype=None):
+        """write_declaration(self, version=None, standalone=None, doctype=None)
+
+        Write an XML declaration and (optionally) a doctype into the file.
+        """
+        assert self._c_out is not NULL
+        cdef const_xmlChar* c_version
+        cdef int c_standalone
+        if self._method != OUTPUT_METHOD_XML:
+            raise LxmlSyntaxError("only XML documents have declarations")
+        if self._status >= WRITER_DECL_WRITTEN:
+            raise LxmlSyntaxError("XML declaration already written")
+        version = _utf8orNone(version)
+        c_version = _xcstr(version) if version is not None else NULL
+        doctype = _utf8orNone(doctype)
+        if standalone is None:
+            c_standalone = -1
+        else:
+            c_standalone = 1 if standalone else 0
+        _writeDeclarationToBuffer(self._c_out, c_version, self._c_encoding, c_standalone)
+        if doctype is not None:
+            _writeDoctype(self._c_out, _xcstr(doctype))
+            self._status = WRITER_DTD_WRITTEN
+        else:
+            self._status = WRITER_DECL_WRITTEN
+        if not self._buffered:
+            tree.xmlOutputBufferFlush(self._c_out)
+        self._handle_error(self._c_out.error)
+
+    def write_doctype(self, doctype):
+        """write_doctype(self, doctype)
+
+        Writes the given doctype declaration verbatimly into the file.
+        """
+        assert self._c_out is not NULL
+        if doctype is None:
+            return
+        if self._status >= WRITER_DTD_WRITTEN:
+            raise LxmlSyntaxError("DOCTYPE already written or cannot write it here")
+        doctype = _utf8(doctype)
+        _writeDoctype(self._c_out, _xcstr(doctype))
+        self._status = WRITER_DTD_WRITTEN
+        if not self._buffered:
+            tree.xmlOutputBufferFlush(self._c_out)
+        self._handle_error(self._c_out.error)
+
+    def method(self, method):
+        """method(self, method)
+
+        Returns a context manager that overrides and restores the output method.
+        method is one of (None, 'xml', 'html') where None means 'xml'.
+        """
+        assert self._c_out is not NULL
+        c_method = self._method if method is None else _findOutputMethod(method)
+        return _MethodChanger(self, c_method)
+
+    def element(self, tag, attrib=None, nsmap=None, method=None, **_extra):
+        """element(self, tag, attrib=None, nsmap=None, method, **_extra)
+
+        Returns a context manager that writes an opening and closing tag.
+        method is one of (None, 'xml', 'html') where None means 'xml'.
+        """
+        assert self._c_out is not NULL
+        attributes = []
+        if attrib is not None:
+            for name, value in _iter_attrib(attrib):
+                if name not in _extra:
+                    ns, name = _getNsTag(name)
+                    attributes.append((ns, name, _utf8(value)))
+        if _extra:
+            for name, value in _extra.iteritems():
+                ns, name = _getNsTag(name)
+                attributes.append((ns, name, _utf8(value)))
+        reversed_nsmap = {}
+        if nsmap:
+            for prefix, ns in nsmap.items():
+                if prefix is not None:
+                    prefix = _utf8(prefix)
+                    _prefixValidOrRaise(prefix)
+                reversed_nsmap[_utf8(ns)] = prefix
+        ns, name = _getNsTag(tag)
+
+        c_method = self._method if method is None else _findOutputMethod(method)
+
+        return _FileWriterElement(self, (ns, name, attributes, reversed_nsmap), c_method)
+
+    cdef _write_qname(self, bytes name, bytes prefix):
+        if prefix:  # empty bytes for no prefix (not None to allow sorting)
+            tree.xmlOutputBufferWrite(self._c_out, len(prefix), _cstr(prefix))
+            tree.xmlOutputBufferWrite(self._c_out, 1, ':')
+        tree.xmlOutputBufferWrite(self._c_out, len(name), _cstr(name))
+
+    cdef _write_start_element(self, element_config):
+        if self._status > WRITER_IN_ELEMENT:
+            raise LxmlSyntaxError("cannot append trailing element to complete XML document")
+        ns, name, attributes, nsmap = element_config
+        flat_namespace_map, new_namespaces = self._collect_namespaces(nsmap)
+        prefix = self._find_prefix(ns, flat_namespace_map, new_namespaces)
+        tree.xmlOutputBufferWrite(self._c_out, 1, '<')
+        self._write_qname(name, prefix)
+
+        self._write_attributes_and_namespaces(
+            attributes, flat_namespace_map, new_namespaces)
+
+        tree.xmlOutputBufferWrite(self._c_out, 1, '>')
+        if not self._buffered:
+            tree.xmlOutputBufferFlush(self._c_out)
+        self._handle_error(self._c_out.error)
+
+        self._element_stack.append((ns, name, prefix, flat_namespace_map))
+        self._status = WRITER_IN_ELEMENT
+
+    cdef _write_attributes_and_namespaces(self, list attributes,
+                                          dict flat_namespace_map,
+                                          list new_namespaces):
+        if attributes:
+            # _find_prefix() may append to new_namespaces => build them first
+            attributes = [
+                (self._find_prefix(ns, flat_namespace_map, new_namespaces), name, value)
+                for ns, name, value in attributes ]
+        if new_namespaces:
+            new_namespaces.sort()
+            self._write_attributes_list(new_namespaces)
+        if attributes:
+            self._write_attributes_list(attributes)
+
+    cdef _write_attributes_list(self, list attributes):
+        for prefix, name, value in attributes:
+            tree.xmlOutputBufferWrite(self._c_out, 1, ' ')
+            self._write_qname(name, prefix)
+            tree.xmlOutputBufferWrite(self._c_out, 2, '="')
+            _write_attr_string(self._c_out, _cstr(value))
+
+            tree.xmlOutputBufferWrite(self._c_out, 1, '"')
+
+    cdef _write_end_element(self, element_config):
+        if self._status != WRITER_IN_ELEMENT:
+            raise LxmlSyntaxError("not in an element")
+        if not self._element_stack or self._element_stack[-1][:2] != element_config[:2]:
+            raise LxmlSyntaxError("inconsistent exit action in context manager")
+
+        # If previous write operations failed, the context manager exit might still call us.
+        # That is ok, but we stop writing closing tags and handling errors in that case.
+        # For all non-I/O errors, we continue writing closing tags if we can.
+        ok_to_write = self._c_out.error == xmlerror.XML_ERR_OK
+
+        name, prefix = self._element_stack.pop()[1:3]
+        if ok_to_write:
+            tree.xmlOutputBufferWrite(self._c_out, 2, '</')
+            self._write_qname(name, prefix)
+            tree.xmlOutputBufferWrite(self._c_out, 1, '>')
+
+        if not self._element_stack:
+            self._status = WRITER_FINISHED
+        if ok_to_write:
+            if not self._buffered:
+                tree.xmlOutputBufferFlush(self._c_out)
+            self._handle_error(self._c_out.error)
+
+    cdef _find_prefix(self, bytes href, dict flat_namespaces_map, list new_namespaces):
+        if href is None:
+            return None
+        if href in flat_namespaces_map:
+            return flat_namespaces_map[href]
+        # need to create a new prefix
+        prefixes = flat_namespaces_map.values()
+        i = 0
+        while True:
+            prefix = _utf8('ns%d' % i)
+            if prefix not in prefixes:
+                new_namespaces.append((b'xmlns', prefix, href))
+                flat_namespaces_map[href] = prefix
+                return prefix
+            i += 1
+
+    cdef _collect_namespaces(self, dict nsmap):
+        new_namespaces = []
+        flat_namespaces_map = {}
+        for ns, prefix in nsmap.iteritems():
+            flat_namespaces_map[ns] = prefix
+            if prefix is None:
+                # use empty bytes rather than None to allow sorting
+                new_namespaces.append((b'', b'xmlns', ns))
+            else:
+                new_namespaces.append((b'xmlns', prefix, ns))
+        # merge in flat namespace map of parent
+        if self._element_stack:
+            for ns, prefix in (<dict>self._element_stack[-1][-1]).iteritems():
+                if flat_namespaces_map.get(ns) is None:
+                    # unknown or empty prefix => prefer a 'real' prefix
+                    flat_namespaces_map[ns] = prefix
+        return flat_namespaces_map, new_namespaces
+
+    def write(self, *args, bint with_tail=True, bint pretty_print=False, method=None):
+        """write(self, *args, with_tail=True, pretty_print=False, method=None)
+
+        Write subtrees or strings into the file.
+
+        If method is not None, it should be one of ('html', 'xml', 'text')
+        to temporarily override the output method.
+        """
+        assert self._c_out is not NULL
+        c_method = self._method if method is None else _findOutputMethod(method)
+
+        for content in args:
+            if _isString(content):
+                if self._status != WRITER_IN_ELEMENT:
+                    if self._status > WRITER_IN_ELEMENT or content.strip():
+                        raise LxmlSyntaxError("not in an element")
+                bstring = _utf8(content)
+                if not bstring:
+                    continue
+
+                ns, name, _, _ = self._element_stack[-1]
+                if (c_method == OUTPUT_METHOD_HTML and
+                        ns in (None, b'http://www.w3.org/1999/xhtml') and
+                        name in (b'script', b'style')):
+                    tree.xmlOutputBufferWrite(self._c_out, len(bstring), _cstr(bstring))
+
+                else:
+                    tree.xmlOutputBufferWriteEscape(self._c_out, _xcstr(bstring), NULL)
+
+            elif iselement(content):
+                if self._status > WRITER_IN_ELEMENT:
+                    raise LxmlSyntaxError("cannot append trailing element to complete XML document")
+                _writeNodeToBuffer(self._c_out, (<_Element>content)._c_node,
+                                   self._c_encoding, NULL, c_method,
+                                   False, False, pretty_print, with_tail, False)
+                if (<_Element>content)._c_node.type == tree.XML_ELEMENT_NODE:
+                    if not self._element_stack:
+                        self._status = WRITER_FINISHED
+
+            elif content is not None:
+                raise TypeError(
+                    f"got invalid input value of type {type(content)}, expected string or Element")
+            self._handle_error(self._c_out.error)
+        if not self._buffered:
+            tree.xmlOutputBufferFlush(self._c_out)
+            self._handle_error(self._c_out.error)
+
+    def flush(self):
+        """flush(self)
+
+        Write any pending content of the current output buffer to the stream.
+        """
+        assert self._c_out is not NULL
+        tree.xmlOutputBufferFlush(self._c_out)
+        self._handle_error(self._c_out.error)
+
+    cdef _close(self, bint raise_on_error):
+        if raise_on_error:
+            if self._status < WRITER_IN_ELEMENT:
+                raise LxmlSyntaxError("no content written")
+            if self._element_stack:
+                raise LxmlSyntaxError("pending open tags on close")
+        error_result = self._c_out.error
+        if error_result == xmlerror.XML_ERR_OK:
+            error_result = tree.xmlOutputBufferClose(self._c_out)
+            if error_result != -1:
+                error_result = xmlerror.XML_ERR_OK
+        else:
+            tree.xmlOutputBufferClose(self._c_out)
+        self._status = WRITER_FINISHED
+        self._c_out = NULL
+        del self._element_stack[:]
+        if raise_on_error:
+            self._handle_error(error_result)
+
+    cdef _handle_error(self, int error_result):
+        if error_result != xmlerror.XML_ERR_OK:
+            if self._target is not None:
+                self._target._exc_context._raise_if_stored()
+            _raiseSerialisationError(error_result)
+
+
+@cython.final
+@cython.internal
+cdef class _AsyncDataWriter:
+    cdef list _data
+    def __cinit__(self):
+        self._data = []
+
+    cdef bytes collect(self):
+        data = b''.join(self._data)
+        del self._data[:]
+        return data
+
+    def write(self, data):
+        self._data.append(data)
+
+    def close(self):
+        pass
+
+
+@cython.final
+@cython.internal
+cdef class _AsyncIncrementalFileWriter:
+    cdef _IncrementalFileWriter _writer
+    cdef _AsyncDataWriter _buffer
+    cdef object _async_outfile
+    cdef int _flush_after_writes
+    cdef bint _should_close
+    cdef bint _buffered
+
+    def __cinit__(self, async_outfile, bytes encoding, int compresslevel, bint close,
+                  bint buffered, int method):
+        self._flush_after_writes = 20
+        self._async_outfile = async_outfile
+        self._should_close = close
+        self._buffered = buffered
+        self._buffer = _AsyncDataWriter()
+        self._writer = _IncrementalFileWriter(
+            self._buffer, encoding, compresslevel, close=True, buffered=False, method=method)
+
+    cdef bytes _flush(self):
+        if not self._buffered or len(self._buffer._data) > self._flush_after_writes:
+            return self._buffer.collect()
+        return None
+
+    async def flush(self):
+        self._writer.flush()
+        data = self._buffer.collect()
+        if data:
+            await self._async_outfile.write(data)
+
+    async def write_declaration(self, version=None, standalone=None, doctype=None):
+        self._writer.write_declaration(version, standalone, doctype)
+        data = self._flush()
+        if data:
+            await self._async_outfile.write(data)
+
+    async def write_doctype(self, doctype):
+        self._writer.write_doctype(doctype)
+        data = self._flush()
+        if data:
+            await self._async_outfile.write(data)
+
+    async def write(self, *args, with_tail=True, pretty_print=False, method=None):
+        self._writer.write(*args, with_tail=with_tail, pretty_print=pretty_print, method=method)
+        data = self._flush()
+        if data:
+            await self._async_outfile.write(data)
+
+    def method(self, method):
+        return self._writer.method(method)
+
+    def element(self, tag, attrib=None, nsmap=None, method=None, **_extra):
+        element_writer = self._writer.element(tag, attrib, nsmap, method, **_extra)
+        return _AsyncFileWriterElement(element_writer, self)
+
+    async def _close(self, bint raise_on_error):
+        self._writer._close(raise_on_error)
+        data = self._buffer.collect()
+        if data:
+            await self._async_outfile.write(data)
+        if self._should_close:
+            await self._async_outfile.close()
+
+
+@cython.final
+@cython.internal
+cdef class _AsyncFileWriterElement:
+    cdef _FileWriterElement _element_writer
+    cdef _AsyncIncrementalFileWriter _writer
+
+    def __cinit__(self, _FileWriterElement element_writer not None,
+                  _AsyncIncrementalFileWriter writer not None):
+        self._element_writer = element_writer
+        self._writer = writer
+
+    async def __aenter__(self):
+        self._element_writer.__enter__()
+        data = self._writer._flush()
+        if data:
+            await self._writer._async_outfile.write(data)
+
+    async def __aexit__(self, *args):
+        self._element_writer.__exit__(*args)
+        data = self._writer._flush()
+        if data:
+            await self._writer._async_outfile.write(data)
+
+
+@cython.final
+@cython.internal
+@cython.freelist(8)
+cdef class _FileWriterElement:
+    cdef _IncrementalFileWriter _writer
+    cdef object _element
+    cdef int _new_method
+    cdef int _old_method
+
+    def __cinit__(self, _IncrementalFileWriter writer not None, element_config, int method):
+        self._writer = writer
+        self._element = element_config
+        self._new_method = method
+        self._old_method = writer._method
+
+    def __enter__(self):
+        self._writer._method = self._new_method
+        self._writer._write_start_element(self._element)
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self._writer._write_end_element(self._element)
+        self._writer._method = self._old_method
+
+
+@cython.final
+@cython.internal
+@cython.freelist(8)
+cdef class _MethodChanger:
+    cdef _IncrementalFileWriter _writer
+    cdef int _new_method
+    cdef int _old_method
+    cdef bint _entered
+    cdef bint _exited
+
+    def __cinit__(self, _IncrementalFileWriter writer not None, int method):
+        self._writer = writer
+        self._new_method = method
+        self._old_method = writer._method
+        self._entered = False
+        self._exited = False
+
+    def __enter__(self):
+        if self._entered:
+            raise LxmlSyntaxError("Inconsistent enter action in context manager")
+        self._writer._method = self._new_method
+        self._entered = True
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        if self._exited:
+            raise LxmlSyntaxError("Inconsistent exit action in context manager")
+        if self._writer._method != self._new_method:
+            raise LxmlSyntaxError("Method changed outside of context manager")
+        self._writer._method = self._old_method
+        self._exited = True
+
+    async def __aenter__(self):
+        # for your async convenience
+        return self.__enter__()
+
+    async def __aexit__(self, *args):
+        # for your async convenience
+        return self.__exit__(*args)

llmeval-env/lib/python3.10/site-packages/lxml/usedoctest.py

@@ -0,0 +1,13 @@
+"""Doctest module for XML comparison.
+
+Usage::
+
+   >>> import lxml.usedoctest
+   >>> # now do your XML doctests ...
+
+See `lxml.doctestcompare`
+"""
+
+from lxml import doctestcompare
+
+doctestcompare.temp_install(del_module=__name__)

llmeval-env/lib/python3.10/site-packages/lxml/xmlid.pxi

@@ -0,0 +1,179 @@
+cdef object _find_id_attributes
+
+def XMLID(text, parser=None, *, base_url=None):
+    """XMLID(text, parser=None, base_url=None)
+
+    Parse the text and return a tuple (root node, ID dictionary).  The root
+    node is the same as returned by the XML() function.  The dictionary
+    contains string-element pairs.  The dictionary keys are the values of 'id'
+    attributes.  The elements referenced by the ID are stored as dictionary
+    values.
+    """
+    cdef dict dic
+    global _find_id_attributes
+    if _find_id_attributes is None:
+        _find_id_attributes = XPath('//*[string(@id)]')
+
+    # ElementTree compatible implementation: parse and look for 'id' attributes
+    root = XML(text, parser, base_url=base_url)
+    dic = {}
+    for elem in _find_id_attributes(root):
+        dic[elem.get('id')] = elem
+    return root, dic
+
+def XMLDTDID(text, parser=None, *, base_url=None):
+    """XMLDTDID(text, parser=None, base_url=None)
+
+    Parse the text and return a tuple (root node, ID dictionary).  The root
+    node is the same as returned by the XML() function.  The dictionary
+    contains string-element pairs.  The dictionary keys are the values of ID
+    attributes as defined by the DTD.  The elements referenced by the ID are
+    stored as dictionary values.
+
+    Note that you must not modify the XML tree if you use the ID dictionary.
+    The results are undefined.
+    """
+    cdef _Element root
+    root = XML(text, parser, base_url=base_url)
+    # xml:id spec compatible implementation: use DTD ID attributes from libxml2
+    if root._doc._c_doc.ids is NULL:
+        return root, {}
+    else:
+        return root, _IDDict(root)
+
+def parseid(source, parser=None, *, base_url=None):
+    """parseid(source, parser=None)
+
+    Parses the source into a tuple containing an ElementTree object and an
+    ID dictionary.  If no parser is provided as second argument, the default
+    parser is used.
+
+    Note that you must not modify the XML tree if you use the ID dictionary.
+    The results are undefined.
+    """
+    cdef _Document doc
+    doc = _parseDocument(source, parser, base_url)
+    return _elementTreeFactory(doc, None), _IDDict(doc)
+
+cdef class _IDDict:
+    """IDDict(self, etree)
+    A dictionary-like proxy class that mapps ID attributes to elements.
+
+    The dictionary must be instantiated with the root element of a parsed XML
+    document, otherwise the behaviour is undefined.  Elements and XML trees
+    that were created or modified 'by hand' are not supported.
+    """
+    cdef _Document _doc
+    cdef object _keys
+    cdef object _items
+    def __cinit__(self, etree):
+        cdef _Document doc
+        doc = _documentOrRaise(etree)
+        if doc._c_doc.ids is NULL:
+            raise ValueError, "No ID dictionary available."
+        self._doc = doc
+        self._keys  = None
+        self._items = None
+
+    def copy(self):
+        return _IDDict(self._doc)
+
+    def __getitem__(self, id_name):
+        cdef tree.xmlHashTable* c_ids
+        cdef tree.xmlID* c_id
+        cdef xmlAttr* c_attr
+        c_ids = self._doc._c_doc.ids
+        id_utf = _utf8(id_name)
+        c_id = <tree.xmlID*>tree.xmlHashLookup(c_ids, _xcstr(id_utf))
+        if c_id is NULL:
+            raise KeyError, "key not found."
+        c_attr = c_id.attr
+        if c_attr is NULL or c_attr.parent is NULL:
+            raise KeyError, "ID attribute not found."
+        return _elementFactory(self._doc, c_attr.parent)
+
+    def get(self, id_name):
+        return self[id_name]
+
+    def __contains__(self, id_name):
+        cdef tree.xmlID* c_id
+        id_utf = _utf8(id_name)
+        c_id = <tree.xmlID*>tree.xmlHashLookup(
+            self._doc._c_doc.ids, _xcstr(id_utf))
+        return c_id is not NULL
+
+    def has_key(self, id_name):
+        return id_name in self
+
+    def __repr__(self):
+        return repr(dict(self))
+
+    def keys(self):
+        if self._keys is None:
+            self._keys = self._build_keys()
+        return self._keys[:]
+
+    def __iter__(self):
+        if self._keys is None:
+            self._keys = self._build_keys()
+        return iter(self._keys)
+
+    def iterkeys(self):
+        return self
+
+    def __len__(self):
+        if self._keys is None:
+            self._keys = self._build_keys()
+        return len(self._keys)
+
+    def items(self):
+        if self._items is None:
+            self._items = self._build_items()
+        return self._items[:]
+
+    def iteritems(self):
+        if self._items is None:
+            self._items = self._build_items()
+        return iter(self._items)
+
+    def values(self):
+        cdef list values = []
+        if self._items is None:
+            self._items = self._build_items()
+        for item in self._items:
+            value = python.PyTuple_GET_ITEM(item, 1)
+            python.Py_INCREF(value)
+            values.append(value)
+        return values
+
+    def itervalues(self):
+        return iter(self.values())
+
+    cdef object _build_keys(self):
+        keys = []
+        tree.xmlHashScan(<tree.xmlHashTable*>self._doc._c_doc.ids,
+                         <tree.xmlHashScanner>_collectIdHashKeys, <python.PyObject*>keys)
+        return keys
+
+    cdef object _build_items(self):
+        items = []
+        context = (items, self._doc)
+        tree.xmlHashScan(<tree.xmlHashTable*>self._doc._c_doc.ids,
+                         <tree.xmlHashScanner>_collectIdHashItemList, <python.PyObject*>context)
+        return items
+
+cdef void _collectIdHashItemList(void* payload, void* context, xmlChar* name) noexcept:
+    # collect elements from ID attribute hash table
+    cdef list lst
+    c_id = <tree.xmlID*>payload
+    if c_id is NULL or c_id.attr is NULL or c_id.attr.parent is NULL:
+        return
+    lst, doc = <tuple>context
+    element = _elementFactory(doc, c_id.attr.parent)
+    lst.append( (funicode(name), element) )
+
+cdef void _collectIdHashKeys(void* payload, void* collect_list, xmlChar* name) noexcept:
+    c_id = <tree.xmlID*>payload
+    if c_id is NULL or c_id.attr is NULL or c_id.attr.parent is NULL:
+        return
+    (<list>collect_list).append(funicode(name))

llmeval-env/lib/python3.10/site-packages/lxml/xmlschema.pxi

@@ -0,0 +1,215 @@
+#  support for XMLSchema validation
+from lxml.includes cimport xmlschema
+
+
+cdef class XMLSchemaError(LxmlError):
+    """Base class of all XML Schema errors
+    """
+
+cdef class XMLSchemaParseError(XMLSchemaError):
+    """Error while parsing an XML document as XML Schema.
+    """
+
+cdef class XMLSchemaValidateError(XMLSchemaError):
+    """Error while validating an XML document with an XML Schema.
+    """
+
+
+################################################################################
+# XMLSchema
+
+cdef XPath _check_for_default_attributes = XPath(
+    "boolean(//xs:attribute[@default or @fixed][1])",
+    namespaces={'xs': 'http://www.w3.org/2001/XMLSchema'})
+
+
+cdef class XMLSchema(_Validator):
+    """XMLSchema(self, etree=None, file=None)
+    Turn a document into an XML Schema validator.
+
+    Either pass a schema as Element or ElementTree, or pass a file or
+    filename through the ``file`` keyword argument.
+
+    Passing the ``attribute_defaults`` boolean option will make the
+    schema insert default/fixed attributes into validated documents.
+    """
+    cdef xmlschema.xmlSchema* _c_schema
+    cdef _Document _doc
+    cdef bint _has_default_attributes
+    cdef bint _add_attribute_defaults
+
+    def __cinit__(self):
+        self._has_default_attributes = True # play it safe
+        self._add_attribute_defaults = False
+
+    def __init__(self, etree=None, *, file=None, bint attribute_defaults=False):
+        cdef xmlschema.xmlSchemaParserCtxt* parser_ctxt
+        cdef xmlDoc* c_doc
+
+        self._add_attribute_defaults = attribute_defaults
+        _Validator.__init__(self)
+        c_doc = NULL
+        if etree is not None:
+            doc = _documentOrRaise(etree)
+            root_node = _rootNodeOrRaise(etree)
+            c_doc = _copyDocRoot(doc._c_doc, root_node._c_node)
+            self._doc = _documentFactory(c_doc, doc._parser)
+            parser_ctxt = xmlschema.xmlSchemaNewDocParserCtxt(c_doc)
+        elif file is not None:
+            file = _getFSPathOrObject(file)
+            if _isString(file):
+                filename = _encodeFilename(file)
+                parser_ctxt = xmlschema.xmlSchemaNewParserCtxt(_cstr(filename))
+            else:
+                self._doc = _parseDocument(file, None, None)
+                parser_ctxt = xmlschema.xmlSchemaNewDocParserCtxt(self._doc._c_doc)
+        else:
+            raise XMLSchemaParseError, "No tree or file given"
+
+        if parser_ctxt is NULL:
+            raise MemoryError()
+
+        # Need a cast here because older libxml2 releases do not use 'const' in the functype.
+        xmlschema.xmlSchemaSetParserStructuredErrors(
+            parser_ctxt, <xmlerror.xmlStructuredErrorFunc> _receiveError, <void*>self._error_log)
+        if self._doc is not None:
+            # calling xmlSchemaParse on a schema with imports or
+            # includes will cause libxml2 to create an internal
+            # context for parsing, so push an implied context to route
+            # resolve requests to the document's parser
+            __GLOBAL_PARSER_CONTEXT.pushImpliedContextFromParser(self._doc._parser)
+        with nogil:
+            orig_loader = _register_document_loader()
+            self._c_schema = xmlschema.xmlSchemaParse(parser_ctxt)
+            _reset_document_loader(orig_loader)
+        if self._doc is not None:
+            __GLOBAL_PARSER_CONTEXT.popImpliedContext()
+        xmlschema.xmlSchemaFreeParserCtxt(parser_ctxt)
+
+        if self._c_schema is NULL:
+            raise XMLSchemaParseError(
+                self._error_log._buildExceptionMessage(
+                    "Document is not valid XML Schema"),
+                self._error_log)
+
+        if self._doc is not None:
+            self._has_default_attributes = _check_for_default_attributes(self._doc)
+        self._add_attribute_defaults = attribute_defaults and self._has_default_attributes
+
+    def __dealloc__(self):
+        xmlschema.xmlSchemaFree(self._c_schema)
+
+    def __call__(self, etree):
+        """__call__(self, etree)
+
+        Validate doc using XML Schema.
+
+        Returns true if document is valid, false if not.
+        """
+        cdef xmlschema.xmlSchemaValidCtxt* valid_ctxt
+        cdef _Document doc
+        cdef _Element root_node
+        cdef xmlDoc* c_doc
+        cdef int ret
+
+        assert self._c_schema is not NULL, "Schema instance not initialised"
+        doc = _documentOrRaise(etree)
+        root_node = _rootNodeOrRaise(etree)
+
+        valid_ctxt = xmlschema.xmlSchemaNewValidCtxt(self._c_schema)
+        if valid_ctxt is NULL:
+            raise MemoryError()
+
+        try:
+            if self._add_attribute_defaults:
+                xmlschema.xmlSchemaSetValidOptions(
+                    valid_ctxt, xmlschema.XML_SCHEMA_VAL_VC_I_CREATE)
+
+            self._error_log.clear()
+            # Need a cast here because older libxml2 releases do not use 'const' in the functype.
+            xmlschema.xmlSchemaSetValidStructuredErrors(
+                valid_ctxt, <xmlerror.xmlStructuredErrorFunc> _receiveError, <void*>self._error_log)
+
+            c_doc = _fakeRootDoc(doc._c_doc, root_node._c_node)
+            with nogil:
+                ret = xmlschema.xmlSchemaValidateDoc(valid_ctxt, c_doc)
+            _destroyFakeDoc(doc._c_doc, c_doc)
+        finally:
+            xmlschema.xmlSchemaFreeValidCtxt(valid_ctxt)
+
+        if ret == -1:
+            raise XMLSchemaValidateError(
+                "Internal error in XML Schema validation.",
+                self._error_log)
+        if ret == 0:
+            return True
+        else:
+            return False
+
+    cdef _ParserSchemaValidationContext _newSaxValidator(
+            self, bint add_default_attributes):
+        cdef _ParserSchemaValidationContext context
+        context = _ParserSchemaValidationContext.__new__(_ParserSchemaValidationContext)
+        context._schema = self
+        context._add_default_attributes = (self._has_default_attributes and (
+            add_default_attributes or self._add_attribute_defaults))
+        return context
+
+@cython.final
+@cython.internal
+cdef class _ParserSchemaValidationContext:
+    cdef XMLSchema _schema
+    cdef xmlschema.xmlSchemaValidCtxt* _valid_ctxt
+    cdef xmlschema.xmlSchemaSAXPlugStruct* _sax_plug
+    cdef bint _add_default_attributes
+    def __cinit__(self):
+        self._valid_ctxt = NULL
+        self._sax_plug = NULL
+        self._add_default_attributes = False
+
+    def __dealloc__(self):
+        self.disconnect()
+        if self._valid_ctxt:
+            xmlschema.xmlSchemaFreeValidCtxt(self._valid_ctxt)
+
+    cdef _ParserSchemaValidationContext copy(self):
+        assert self._schema is not None, "_ParserSchemaValidationContext not initialised"
+        return self._schema._newSaxValidator(
+            self._add_default_attributes)
+
+    cdef void inject_default_attributes(self, xmlDoc* c_doc) noexcept:
+        # we currently need to insert default attributes manually
+        # after parsing, as libxml2 does not support this at parse
+        # time
+        if self._add_default_attributes:
+            with nogil:
+                xmlschema.xmlSchemaValidateDoc(self._valid_ctxt, c_doc)
+
+    cdef int connect(self, xmlparser.xmlParserCtxt* c_ctxt, _BaseErrorLog error_log) except -1:
+        if self._valid_ctxt is NULL:
+            self._valid_ctxt = xmlschema.xmlSchemaNewValidCtxt(
+                self._schema._c_schema)
+            if self._valid_ctxt is NULL:
+                raise MemoryError()
+            if self._add_default_attributes:
+                xmlschema.xmlSchemaSetValidOptions(
+                    self._valid_ctxt, xmlschema.XML_SCHEMA_VAL_VC_I_CREATE)
+        if error_log is not None:
+            # Need a cast here because older libxml2 releases do not use 'const' in the functype.
+            xmlschema.xmlSchemaSetValidStructuredErrors(
+                self._valid_ctxt, <xmlerror.xmlStructuredErrorFunc> _receiveError, <void*>error_log)
+        self._sax_plug = xmlschema.xmlSchemaSAXPlug(
+            self._valid_ctxt, &c_ctxt.sax, &c_ctxt.userData)
+
+    cdef void disconnect(self) noexcept:
+        if self._sax_plug is not NULL:
+            xmlschema.xmlSchemaSAXUnplug(self._sax_plug)
+            self._sax_plug = NULL
+        if self._valid_ctxt is not NULL:
+            xmlschema.xmlSchemaSetValidStructuredErrors(
+                self._valid_ctxt, NULL, NULL)
+
+    cdef bint isvalid(self) noexcept:
+        if self._valid_ctxt is NULL:
+            return 1 # valid
+        return xmlschema.xmlSchemaIsValid(self._valid_ctxt)

llmeval-env/lib/python3.10/site-packages/lxml/xpath.pxi

@@ -0,0 +1,487 @@
+# XPath evaluation
+
+class XPathSyntaxError(LxmlSyntaxError, XPathError):
+    pass
+
+################################################################################
+# XPath
+
+cdef object _XPATH_SYNTAX_ERRORS = (
+    xmlerror.XML_XPATH_NUMBER_ERROR,
+    xmlerror.XML_XPATH_UNFINISHED_LITERAL_ERROR,
+    xmlerror.XML_XPATH_VARIABLE_REF_ERROR,
+    xmlerror.XML_XPATH_INVALID_PREDICATE_ERROR,
+    xmlerror.XML_XPATH_UNCLOSED_ERROR,
+    xmlerror.XML_XPATH_INVALID_CHAR_ERROR
+)
+
+cdef object _XPATH_EVAL_ERRORS = (
+    xmlerror.XML_XPATH_UNDEF_VARIABLE_ERROR,
+    xmlerror.XML_XPATH_UNDEF_PREFIX_ERROR,
+    xmlerror.XML_XPATH_UNKNOWN_FUNC_ERROR,
+    xmlerror.XML_XPATH_INVALID_OPERAND,
+    xmlerror.XML_XPATH_INVALID_TYPE,
+    xmlerror.XML_XPATH_INVALID_ARITY,
+    xmlerror.XML_XPATH_INVALID_CTXT_SIZE,
+    xmlerror.XML_XPATH_INVALID_CTXT_POSITION
+)
+
+cdef int _register_xpath_function(void* ctxt, name_utf, ns_utf) noexcept:
+    if ns_utf is None:
+        return xpath.xmlXPathRegisterFunc(
+            <xpath.xmlXPathContext*>ctxt, _xcstr(name_utf),
+            _xpath_function_call)
+    else:
+        return xpath.xmlXPathRegisterFuncNS(
+            <xpath.xmlXPathContext*>ctxt, _xcstr(name_utf), _xcstr(ns_utf),
+            _xpath_function_call)
+
+cdef int _unregister_xpath_function(void* ctxt, name_utf, ns_utf) noexcept:
+    if ns_utf is None:
+        return xpath.xmlXPathRegisterFunc(
+            <xpath.xmlXPathContext*>ctxt, _xcstr(name_utf), NULL)
+    else:
+        return xpath.xmlXPathRegisterFuncNS(
+            <xpath.xmlXPathContext*>ctxt, _xcstr(name_utf), _xcstr(ns_utf), NULL)
+
+
+@cython.final
+@cython.internal
+cdef class _XPathContext(_BaseContext):
+    cdef object _variables
+    def __init__(self, namespaces, extensions, error_log, enable_regexp, variables,
+                 build_smart_strings):
+        self._variables = variables
+        _BaseContext.__init__(self, namespaces, extensions, error_log, enable_regexp,
+                              build_smart_strings)
+
+    cdef set_context(self, xpath.xmlXPathContext* xpathCtxt):
+        self._set_xpath_context(xpathCtxt)
+        # This would be a good place to set up the XPath parser dict, but
+        # we cannot use the current thread dict as we do not know which
+        # thread will execute the XPath evaluator - so, no dict for now.
+        self.registerLocalNamespaces()
+        self.registerLocalFunctions(xpathCtxt, _register_xpath_function)
+
+    cdef register_context(self, _Document doc):
+        self._register_context(doc)
+        self.registerGlobalNamespaces()
+        self.registerGlobalFunctions(self._xpathCtxt, _register_xpath_function)
+        self.registerExsltFunctions()
+        if self._variables is not None:
+            self.registerVariables(self._variables)
+
+    cdef unregister_context(self):
+        self.unregisterGlobalFunctions(
+            self._xpathCtxt, _unregister_xpath_function)
+        self.unregisterGlobalNamespaces()
+        xpath.xmlXPathRegisteredVariablesCleanup(self._xpathCtxt)
+        self._cleanup_context()
+
+    cdef void registerExsltFunctions(self) noexcept:
+        if xslt.LIBXSLT_VERSION < 10125:
+            # we'd only execute dummy functions anyway
+            return
+        tree.xmlHashScan(
+            self._xpathCtxt.nsHash, _registerExsltFunctionsForNamespaces,
+            self._xpathCtxt)
+
+    cdef registerVariables(self, variable_dict):
+        for name, value in variable_dict.items():
+            name_utf = self._to_utf(name)
+            xpath.xmlXPathRegisterVariable(
+                self._xpathCtxt, _xcstr(name_utf), _wrapXPathObject(value, None, None))
+
+    cdef registerVariable(self, name, value):
+        name_utf = self._to_utf(name)
+        xpath.xmlXPathRegisterVariable(
+            self._xpathCtxt, _xcstr(name_utf), _wrapXPathObject(value, None, None))
+
+
+cdef void _registerExsltFunctionsForNamespaces(
+        void* _c_href, void* _ctxt, const_xmlChar* c_prefix) noexcept:
+    c_href = <const_xmlChar*> _c_href
+    ctxt = <xpath.xmlXPathContext*> _ctxt
+
+    if tree.xmlStrcmp(c_href, xslt.EXSLT_DATE_NAMESPACE) == 0:
+        xslt.exsltDateXpathCtxtRegister(ctxt, c_prefix)
+    elif tree.xmlStrcmp(c_href, xslt.EXSLT_SETS_NAMESPACE) == 0:
+        xslt.exsltSetsXpathCtxtRegister(ctxt, c_prefix)
+    elif tree.xmlStrcmp(c_href, xslt.EXSLT_MATH_NAMESPACE) == 0:
+        xslt.exsltMathXpathCtxtRegister(ctxt, c_prefix)
+    elif tree.xmlStrcmp(c_href, xslt.EXSLT_STRINGS_NAMESPACE) == 0:
+        xslt.exsltStrXpathCtxtRegister(ctxt, c_prefix)
+
+
+cdef class _XPathEvaluatorBase:
+    cdef xpath.xmlXPathContext* _xpathCtxt
+    cdef _XPathContext _context
+    cdef python.PyThread_type_lock _eval_lock
+    cdef _ErrorLog _error_log
+    def __cinit__(self):
+        self._xpathCtxt = NULL
+        if config.ENABLE_THREADING:
+            self._eval_lock = python.PyThread_allocate_lock()
+            if self._eval_lock is NULL:
+                raise MemoryError()
+        self._error_log = _ErrorLog()
+
+    def __init__(self, namespaces, extensions, enable_regexp,
+                 smart_strings):
+        self._context = _XPathContext(namespaces, extensions, self._error_log,
+                                      enable_regexp, None, smart_strings)
+
+    @property
+    def error_log(self):
+        assert self._error_log is not None, "XPath evaluator not initialised"
+        return self._error_log.copy()
+
+    def __dealloc__(self):
+        if self._xpathCtxt is not NULL:
+            xpath.xmlXPathFreeContext(self._xpathCtxt)
+        if config.ENABLE_THREADING:
+            if self._eval_lock is not NULL:
+                python.PyThread_free_lock(self._eval_lock)
+
+    cdef set_context(self, xpath.xmlXPathContext* xpathCtxt):
+        self._xpathCtxt = xpathCtxt
+        self._context.set_context(xpathCtxt)
+
+    cdef bint _checkAbsolutePath(self, char* path) noexcept:
+        cdef char c
+        if path is NULL:
+            return 0
+        c = path[0]
+        while c == c' ' or c == c'\t':
+            path = path + 1
+            c = path[0]
+        return c == c'/'
+
+    @cython.final
+    cdef int _lock(self) except -1:
+        cdef int result
+        if config.ENABLE_THREADING and self._eval_lock != NULL:
+            with nogil:
+                result = python.PyThread_acquire_lock(
+                    self._eval_lock, python.WAIT_LOCK)
+            if result == 0:
+                raise XPathError, "XPath evaluator locking failed"
+        return 0
+
+    @cython.final
+    cdef void _unlock(self) noexcept:
+        if config.ENABLE_THREADING and self._eval_lock != NULL:
+            python.PyThread_release_lock(self._eval_lock)
+
+    cdef _build_parse_error(self):
+        cdef _BaseErrorLog entries
+        entries = self._error_log.filter_types(_XPATH_SYNTAX_ERRORS)
+        if entries:
+            message = entries._buildExceptionMessage(None)
+            if message is not None:
+                return XPathSyntaxError(message, self._error_log)
+        return XPathSyntaxError(
+            self._error_log._buildExceptionMessage("Error in xpath expression"),
+            self._error_log)
+
+    cdef _build_eval_error(self):
+        cdef _BaseErrorLog entries
+        entries = self._error_log.filter_types(_XPATH_EVAL_ERRORS)
+        if not entries:
+            entries = self._error_log.filter_types(_XPATH_SYNTAX_ERRORS)
+        if entries:
+            message = entries._buildExceptionMessage(None)
+            if message is not None:
+                return XPathEvalError(message, self._error_log)
+        return XPathEvalError(
+            self._error_log._buildExceptionMessage("Error in xpath expression"),
+            self._error_log)
+
+    cdef object _handle_result(self, xpath.xmlXPathObject* xpathObj, _Document doc):
+        if self._context._exc._has_raised():
+            if xpathObj is not NULL:
+                _freeXPathObject(xpathObj)
+                xpathObj = NULL
+            self._context._release_temp_refs()
+            self._context._exc._raise_if_stored()
+
+        if xpathObj is NULL:
+            self._context._release_temp_refs()
+            raise self._build_eval_error()
+
+        try:
+            result = _unwrapXPathObject(xpathObj, doc, self._context)
+        finally:
+            _freeXPathObject(xpathObj)
+            self._context._release_temp_refs()
+
+        return result
+
+
+cdef class XPathElementEvaluator(_XPathEvaluatorBase):
+    """XPathElementEvaluator(self, element, namespaces=None, extensions=None, regexp=True, smart_strings=True)
+    Create an XPath evaluator for an element.
+
+    Absolute XPath expressions (starting with '/') will be evaluated against
+    the ElementTree as returned by getroottree().
+
+    Additional namespace declarations can be passed with the
+    'namespace' keyword argument.  EXSLT regular expression support
+    can be disabled with the 'regexp' boolean keyword (defaults to
+    True).  Smart strings will be returned for string results unless
+    you pass ``smart_strings=False``.
+    """
+    cdef _Element _element
+    def __init__(self, _Element element not None, *, namespaces=None,
+                 extensions=None, regexp=True, smart_strings=True):
+        cdef xpath.xmlXPathContext* xpathCtxt
+        cdef int ns_register_status
+        cdef _Document doc
+        _assertValidNode(element)
+        _assertValidDoc(element._doc)
+        self._element = element
+        doc = element._doc
+        _XPathEvaluatorBase.__init__(self, namespaces, extensions,
+                                     regexp, smart_strings)
+        xpathCtxt = xpath.xmlXPathNewContext(doc._c_doc)
+        if xpathCtxt is NULL:
+            raise MemoryError()
+        self.set_context(xpathCtxt)
+
+    def register_namespace(self, prefix, uri):
+        """Register a namespace with the XPath context.
+        """
+        assert self._xpathCtxt is not NULL, "XPath context not initialised"
+        self._context.addNamespace(prefix, uri)
+
+    def register_namespaces(self, namespaces):
+        """Register a prefix -> uri dict.
+        """
+        assert self._xpathCtxt is not NULL, "XPath context not initialised"
+        for prefix, uri in namespaces.items():
+            self._context.addNamespace(prefix, uri)
+
+    def __call__(self, _path, **_variables):
+        """__call__(self, _path, **_variables)
+
+        Evaluate an XPath expression on the document.
+
+        Variables may be provided as keyword arguments.  Note that namespaces
+        are currently not supported for variables.
+
+        Absolute XPath expressions (starting with '/') will be evaluated
+        against the ElementTree as returned by getroottree().
+        """
+        cdef xpath.xmlXPathObject*  xpathObj
+        cdef _Document doc
+        assert self._xpathCtxt is not NULL, "XPath context not initialised"
+        path = _utf8(_path)
+        doc = self._element._doc
+
+        self._lock()
+        self._xpathCtxt.node = self._element._c_node
+        try:
+            self._context.register_context(doc)
+            self._context.registerVariables(_variables)
+            c_path = _xcstr(path)
+            with nogil:
+                xpathObj = xpath.xmlXPathEvalExpression(
+                    c_path, self._xpathCtxt)
+            result = self._handle_result(xpathObj, doc)
+        finally:
+            self._context.unregister_context()
+            self._unlock()
+
+        return result
+
+
+cdef class XPathDocumentEvaluator(XPathElementEvaluator):
+    """XPathDocumentEvaluator(self, etree, namespaces=None, extensions=None, regexp=True, smart_strings=True)
+    Create an XPath evaluator for an ElementTree.
+
+    Additional namespace declarations can be passed with the
+    'namespace' keyword argument.  EXSLT regular expression support
+    can be disabled with the 'regexp' boolean keyword (defaults to
+    True).  Smart strings will be returned for string results unless
+    you pass ``smart_strings=False``.
+    """
+    def __init__(self, _ElementTree etree not None, *, namespaces=None,
+                 extensions=None, regexp=True, smart_strings=True):
+        XPathElementEvaluator.__init__(
+            self, etree._context_node, namespaces=namespaces, 
+            extensions=extensions, regexp=regexp,
+            smart_strings=smart_strings)
+
+    def __call__(self, _path, **_variables):
+        """__call__(self, _path, **_variables)
+
+        Evaluate an XPath expression on the document.
+
+        Variables may be provided as keyword arguments.  Note that namespaces
+        are currently not supported for variables.
+        """
+        cdef xpath.xmlXPathObject*  xpathObj
+        cdef xmlDoc* c_doc
+        cdef _Document doc
+        assert self._xpathCtxt is not NULL, "XPath context not initialised"
+        path = _utf8(_path)
+        doc = self._element._doc
+
+        self._lock()
+        try:
+            self._context.register_context(doc)
+            c_doc = _fakeRootDoc(doc._c_doc, self._element._c_node)
+            try:
+                self._context.registerVariables(_variables)
+                c_path = _xcstr(path)
+                with nogil:
+                    self._xpathCtxt.doc  = c_doc
+                    self._xpathCtxt.node = tree.xmlDocGetRootElement(c_doc)
+                    xpathObj = xpath.xmlXPathEvalExpression(
+                        c_path, self._xpathCtxt)
+                result = self._handle_result(xpathObj, doc)
+            finally:
+                _destroyFakeDoc(doc._c_doc, c_doc)
+                self._context.unregister_context()
+        finally:
+            self._unlock()
+
+        return result
+
+
+def XPathEvaluator(etree_or_element, *, namespaces=None, extensions=None,
+                   regexp=True, smart_strings=True):
+    """XPathEvaluator(etree_or_element, namespaces=None, extensions=None, regexp=True, smart_strings=True)
+
+    Creates an XPath evaluator for an ElementTree or an Element.
+
+    The resulting object can be called with an XPath expression as argument
+    and XPath variables provided as keyword arguments.
+
+    Additional namespace declarations can be passed with the
+    'namespace' keyword argument.  EXSLT regular expression support
+    can be disabled with the 'regexp' boolean keyword (defaults to
+    True).  Smart strings will be returned for string results unless
+    you pass ``smart_strings=False``.
+    """
+    if isinstance(etree_or_element, _ElementTree):
+        return XPathDocumentEvaluator(
+            etree_or_element, namespaces=namespaces,
+            extensions=extensions, regexp=regexp, smart_strings=smart_strings)
+    else:
+        return XPathElementEvaluator(
+            etree_or_element, namespaces=namespaces,
+            extensions=extensions, regexp=regexp, smart_strings=smart_strings)
+
+
+cdef class XPath(_XPathEvaluatorBase):
+    """XPath(self, path, namespaces=None, extensions=None, regexp=True, smart_strings=True)
+    A compiled XPath expression that can be called on Elements and ElementTrees.
+
+    Besides the XPath expression, you can pass prefix-namespace
+    mappings and extension functions to the constructor through the
+    keyword arguments ``namespaces`` and ``extensions``.  EXSLT
+    regular expression support can be disabled with the 'regexp'
+    boolean keyword (defaults to True).  Smart strings will be
+    returned for string results unless you pass
+    ``smart_strings=False``.
+    """
+    cdef xpath.xmlXPathCompExpr* _xpath
+    cdef bytes _path
+    def __cinit__(self):
+        self._xpath = NULL
+
+    def __init__(self, path, *, namespaces=None, extensions=None,
+                 regexp=True, smart_strings=True):
+        cdef xpath.xmlXPathContext* xpathCtxt
+        _XPathEvaluatorBase.__init__(self, namespaces, extensions,
+                                     regexp, smart_strings)
+        self._path = _utf8(path)
+        xpathCtxt = xpath.xmlXPathNewContext(NULL)
+        if xpathCtxt is NULL:
+            raise MemoryError()
+        self.set_context(xpathCtxt)
+        self._xpath = xpath.xmlXPathCtxtCompile(xpathCtxt, _xcstr(self._path))
+        if self._xpath is NULL:
+            raise self._build_parse_error()
+
+    def __call__(self, _etree_or_element, **_variables):
+        "__call__(self, _etree_or_element, **_variables)"
+        cdef xpath.xmlXPathObject*  xpathObj
+        cdef _Document document
+        cdef _Element element
+
+        assert self._xpathCtxt is not NULL, "XPath context not initialised"
+        document = _documentOrRaise(_etree_or_element)
+        element  = _rootNodeOrRaise(_etree_or_element)
+
+        self._lock()
+        self._xpathCtxt.doc  = document._c_doc
+        self._xpathCtxt.node = element._c_node
+
+        try:
+            self._context.register_context(document)
+            self._context.registerVariables(_variables)
+            with nogil:
+                xpathObj = xpath.xmlXPathCompiledEval(
+                    self._xpath, self._xpathCtxt)
+            result = self._handle_result(xpathObj, document)
+        finally:
+            self._context.unregister_context()
+            self._unlock()
+        return result
+
+    @property
+    def path(self):
+        """The literal XPath expression.
+        """
+        return self._path.decode('UTF-8')
+
+    def __dealloc__(self):
+        if self._xpath is not NULL:
+            xpath.xmlXPathFreeCompExpr(self._xpath)
+
+    def __repr__(self):
+        return self.path
+
+
+cdef object _replace_strings = re.compile(b'("[^"]*")|(\'[^\']*\')').sub
+cdef object _find_namespaces = re.compile(b'({[^}]+})').findall
+
+cdef class ETXPath(XPath):
+    """ETXPath(self, path, extensions=None, regexp=True, smart_strings=True)
+    Special XPath class that supports the ElementTree {uri} notation for namespaces.
+
+    Note that this class does not accept the ``namespace`` keyword
+    argument. All namespaces must be passed as part of the path
+    string.  Smart strings will be returned for string results unless
+    you pass ``smart_strings=False``.
+    """
+    def __init__(self, path, *, extensions=None, regexp=True,
+                 smart_strings=True):
+        path, namespaces = self._nsextract_path(path)
+        XPath.__init__(self, path, namespaces=namespaces,
+                       extensions=extensions, regexp=regexp,
+                       smart_strings=smart_strings)
+
+    cdef _nsextract_path(self, path):
+        # replace {namespaces} by new prefixes
+        cdef dict namespaces = {}
+        cdef list namespace_defs = []
+        cdef int i
+        path_utf = _utf8(path)
+        stripped_path = _replace_strings(b'', path_utf) # remove string literals
+        i = 1
+        for namespace_def in _find_namespaces(stripped_path):
+            if namespace_def not in namespace_defs:
+                prefix = python.PyBytes_FromFormat("__xpp%02d", i)
+                i += 1
+                namespace_defs.append(namespace_def)
+                namespace = namespace_def[1:-1] # remove '{}'
+                namespace = (<bytes>namespace).decode('utf8')
+                namespaces[prefix.decode('utf8')] = namespace
+                prefix_str = prefix + b':'
+                # FIXME: this also replaces {namespaces} within strings!
+                path_utf = path_utf.replace(namespace_def, prefix_str)
+        path = path_utf.decode('utf8')
+        return path, namespaces

llmeval-env/lib/python3.10/site-packages/lxml/xslt.pxi

@@ -0,0 +1,950 @@
+# XSLT
+from lxml.includes cimport xslt
+
+
+cdef class XSLTError(LxmlError):
+    """Base class of all XSLT errors.
+    """
+
+cdef class XSLTParseError(XSLTError):
+    """Error parsing a stylesheet document.
+    """
+
+cdef class XSLTApplyError(XSLTError):
+    """Error running an XSL transformation.
+    """
+
+class XSLTSaveError(XSLTError, SerialisationError):
+    """Error serialising an XSLT result.
+    """
+
+cdef class XSLTExtensionError(XSLTError):
+    """Error registering an XSLT extension.
+    """
+
+
+# version information
+LIBXSLT_COMPILED_VERSION = __unpackIntVersion(xslt.LIBXSLT_VERSION)
+LIBXSLT_VERSION = __unpackIntVersion(xslt.xsltLibxsltVersion)
+
+
+################################################################################
+# Where do we store what?
+#
+# xsltStylesheet->doc->_private
+#    == _XSLTResolverContext for XSL stylesheet
+#
+# xsltTransformContext->_private
+#    == _XSLTResolverContext for transformed document
+#
+################################################################################
+
+
+################################################################################
+# XSLT document loaders
+
+@cython.final
+@cython.internal
+cdef class _XSLTResolverContext(_ResolverContext):
+    cdef xmlDoc* _c_style_doc
+    cdef _BaseParser _parser
+
+    cdef _XSLTResolverContext _copy(self):
+        cdef _XSLTResolverContext context
+        context = _XSLTResolverContext()
+        _initXSLTResolverContext(context, self._parser)
+        context._c_style_doc = self._c_style_doc
+        return context
+
+cdef _initXSLTResolverContext(_XSLTResolverContext context,
+                              _BaseParser parser):
+    _initResolverContext(context, parser.resolvers)
+    context._parser = parser
+    context._c_style_doc = NULL
+
+cdef xmlDoc* _xslt_resolve_from_python(const_xmlChar* c_uri, void* c_context,
+                                       int parse_options, int* error) with gil:
+    # call the Python document loaders
+    cdef _XSLTResolverContext context
+    cdef _ResolverRegistry resolvers
+    cdef _InputDocument doc_ref
+    cdef xmlDoc* c_doc
+    cdef xmlDoc* c_return_doc = NULL
+
+    error[0] = 0
+    context = <_XSLTResolverContext>c_context
+
+    # shortcut if we resolve the stylesheet itself
+    c_doc = context._c_style_doc
+    try:
+        if c_doc is not NULL and c_doc.URL is not NULL:
+            if tree.xmlStrcmp(c_uri, c_doc.URL) == 0:
+                c_return_doc = _copyDoc(c_doc, 1)
+                return c_return_doc  # 'goto', see 'finally' below
+
+        # delegate to the Python resolvers
+        resolvers = context._resolvers
+        if tree.xmlStrncmp(<unsigned char*>'string://__STRING__XSLT__/', c_uri, 26) == 0:
+            c_uri += 26
+        uri = _decodeFilename(c_uri)
+        doc_ref = resolvers.resolve(uri, None, context)
+
+        if doc_ref is not None:
+            if doc_ref._type == PARSER_DATA_STRING:
+                c_return_doc = _parseDoc(
+                    doc_ref._data_bytes, doc_ref._filename, context._parser)
+            elif doc_ref._type == PARSER_DATA_FILENAME:
+                c_return_doc = _parseDocFromFile(
+                    doc_ref._filename, context._parser)
+            elif doc_ref._type == PARSER_DATA_FILE:
+                c_return_doc = _parseDocFromFilelike(
+                    doc_ref._file, doc_ref._filename, context._parser)
+            elif doc_ref._type == PARSER_DATA_EMPTY:
+                c_return_doc = _newXMLDoc()
+            if c_return_doc is not NULL and c_return_doc.URL is NULL:
+                c_return_doc.URL = tree.xmlStrdup(c_uri)
+    except:
+        error[0] = 1
+        context._store_raised()
+    finally:
+        return c_return_doc  # and swallow any further exceptions
+
+
+cdef void _xslt_store_resolver_exception(const_xmlChar* c_uri, void* context,
+                                         xslt.xsltLoadType c_type) noexcept with gil:
+    try:
+        message = f"Cannot resolve URI {_decodeFilename(c_uri)}"
+        if c_type == xslt.XSLT_LOAD_DOCUMENT:
+            exception = XSLTApplyError(message)
+        else:
+            exception = XSLTParseError(message)
+        (<_XSLTResolverContext>context)._store_exception(exception)
+    except BaseException as e:
+        (<_XSLTResolverContext>context)._store_exception(e)
+    finally:
+        return  # and swallow any further exceptions
+
+
+cdef xmlDoc* _xslt_doc_loader(const_xmlChar* c_uri, tree.xmlDict* c_dict,
+                              int parse_options, void* c_ctxt,
+                              xslt.xsltLoadType c_type) noexcept nogil:
+    # nogil => no Python objects here, may be called without thread context !
+    cdef xmlDoc* c_doc
+    cdef xmlDoc* result
+    cdef void* c_pcontext
+    cdef int error = 0
+    # find resolver contexts of stylesheet and transformed doc
+    if c_type == xslt.XSLT_LOAD_DOCUMENT:
+        # transformation time
+        c_pcontext = (<xslt.xsltTransformContext*>c_ctxt)._private
+    elif c_type == xslt.XSLT_LOAD_STYLESHEET:
+        # include/import resolution while parsing
+        c_pcontext = (<xslt.xsltStylesheet*>c_ctxt).doc._private
+    else:
+        c_pcontext = NULL
+
+    if c_pcontext is NULL:
+        # can't call Python without context, fall back to default loader
+        return XSLT_DOC_DEFAULT_LOADER(
+            c_uri, c_dict, parse_options, c_ctxt, c_type)
+
+    c_doc = _xslt_resolve_from_python(c_uri, c_pcontext, parse_options, &error)
+    if c_doc is NULL and not error:
+        c_doc = XSLT_DOC_DEFAULT_LOADER(
+            c_uri, c_dict, parse_options, c_ctxt, c_type)
+        if c_doc is NULL:
+            _xslt_store_resolver_exception(c_uri, c_pcontext, c_type)
+
+    if c_doc is not NULL and c_type == xslt.XSLT_LOAD_STYLESHEET:
+        c_doc._private = c_pcontext
+    return c_doc
+
+cdef xslt.xsltDocLoaderFunc XSLT_DOC_DEFAULT_LOADER = xslt.xsltDocDefaultLoader
+xslt.xsltSetLoaderFunc(<xslt.xsltDocLoaderFunc>_xslt_doc_loader)
+
+################################################################################
+# XSLT file/network access control
+
+cdef class XSLTAccessControl:
+    """XSLTAccessControl(self, read_file=True, write_file=True, create_dir=True, read_network=True, write_network=True)
+
+    Access control for XSLT: reading/writing files, directories and
+    network I/O.  Access to a type of resource is granted or denied by
+    passing any of the following boolean keyword arguments.  All of
+    them default to True to allow access.
+
+    - read_file
+    - write_file
+    - create_dir
+    - read_network
+    - write_network
+
+    For convenience, there is also a class member `DENY_ALL` that
+    provides an XSLTAccessControl instance that is readily configured
+    to deny everything, and a `DENY_WRITE` member that denies all
+    write access but allows read access.
+
+    See `XSLT`.
+    """
+    cdef xslt.xsltSecurityPrefs* _prefs
+    def __cinit__(self):
+        self._prefs = xslt.xsltNewSecurityPrefs()
+        if self._prefs is NULL:
+            raise MemoryError()
+
+    def __init__(self, *, bint read_file=True, bint write_file=True, bint create_dir=True,
+                 bint read_network=True, bint write_network=True):
+        self._setAccess(xslt.XSLT_SECPREF_READ_FILE, read_file)
+        self._setAccess(xslt.XSLT_SECPREF_WRITE_FILE, write_file)
+        self._setAccess(xslt.XSLT_SECPREF_CREATE_DIRECTORY, create_dir)
+        self._setAccess(xslt.XSLT_SECPREF_READ_NETWORK, read_network)
+        self._setAccess(xslt.XSLT_SECPREF_WRITE_NETWORK, write_network)
+
+    DENY_ALL = XSLTAccessControl(
+        read_file=False, write_file=False, create_dir=False,
+        read_network=False, write_network=False)
+
+    DENY_WRITE = XSLTAccessControl(
+        read_file=True, write_file=False, create_dir=False,
+        read_network=True, write_network=False)
+
+    def __dealloc__(self):
+        if self._prefs is not NULL:
+            xslt.xsltFreeSecurityPrefs(self._prefs)
+
+    @cython.final
+    cdef _setAccess(self, xslt.xsltSecurityOption option, bint allow):
+        cdef xslt.xsltSecurityCheck function
+        if allow:
+            function = xslt.xsltSecurityAllow
+        else:
+            function = xslt.xsltSecurityForbid
+        xslt.xsltSetSecurityPrefs(self._prefs, option, function)
+
+    @cython.final
+    cdef void _register_in_context(self, xslt.xsltTransformContext* ctxt) noexcept:
+        xslt.xsltSetCtxtSecurityPrefs(self._prefs, ctxt)
+
+    @property
+    def options(self):
+        """The access control configuration as a map of options."""
+        return {
+            'read_file': self._optval(xslt.XSLT_SECPREF_READ_FILE),
+            'write_file': self._optval(xslt.XSLT_SECPREF_WRITE_FILE),
+            'create_dir': self._optval(xslt.XSLT_SECPREF_CREATE_DIRECTORY),
+            'read_network': self._optval(xslt.XSLT_SECPREF_READ_NETWORK),
+            'write_network': self._optval(xslt.XSLT_SECPREF_WRITE_NETWORK),
+        }
+
+    @cython.final
+    cdef _optval(self, xslt.xsltSecurityOption option):
+        cdef xslt.xsltSecurityCheck function
+        function = xslt.xsltGetSecurityPrefs(self._prefs, option)
+        if function is <xslt.xsltSecurityCheck>xslt.xsltSecurityAllow:
+            return True
+        elif function is <xslt.xsltSecurityCheck>xslt.xsltSecurityForbid:
+            return False
+        else:
+            return None
+
+    def __repr__(self):
+        items = sorted(self.options.items())
+        return "%s(%s)" % (
+            python._fqtypename(self).decode('UTF-8').split('.')[-1],
+            ', '.join(["%s=%r" % item for item in items]))
+
+################################################################################
+# XSLT
+
+cdef int _register_xslt_function(void* ctxt, name_utf, ns_utf) noexcept:
+    if ns_utf is None:
+        return 0
+    # libxml2 internalises the strings if ctxt has a dict
+    return xslt.xsltRegisterExtFunction(
+        <xslt.xsltTransformContext*>ctxt, _xcstr(name_utf), _xcstr(ns_utf),
+        <xslt.xmlXPathFunction>_xpath_function_call)
+
+cdef dict EMPTY_DICT = {}
+
+@cython.final
+@cython.internal
+cdef class _XSLTContext(_BaseContext):
+    cdef xslt.xsltTransformContext* _xsltCtxt
+    cdef _ReadOnlyElementProxy _extension_element_proxy
+    cdef dict _extension_elements
+    def __cinit__(self):
+        self._xsltCtxt = NULL
+        self._extension_elements = EMPTY_DICT
+
+    def __init__(self, namespaces, extensions, error_log, enable_regexp,
+                 build_smart_strings):
+        if extensions is not None and extensions:
+            for ns_name_tuple, extension in extensions.items():
+                if ns_name_tuple[0] is None:
+                    raise XSLTExtensionError, \
+                        "extensions must not have empty namespaces"
+                if isinstance(extension, XSLTExtension):
+                    if self._extension_elements is EMPTY_DICT:
+                        self._extension_elements = {}
+                        extensions = extensions.copy()
+                    ns_utf   = _utf8(ns_name_tuple[0])
+                    name_utf = _utf8(ns_name_tuple[1])
+                    self._extension_elements[(ns_utf, name_utf)] = extension
+                    del extensions[ns_name_tuple]
+        _BaseContext.__init__(self, namespaces, extensions, error_log, enable_regexp,
+                              build_smart_strings)
+
+    cdef _BaseContext _copy(self):
+        cdef _XSLTContext context
+        context = <_XSLTContext>_BaseContext._copy(self)
+        context._extension_elements = self._extension_elements
+        return context
+
+    cdef register_context(self, xslt.xsltTransformContext* xsltCtxt,
+                               _Document doc):
+        self._xsltCtxt = xsltCtxt
+        self._set_xpath_context(xsltCtxt.xpathCtxt)
+        self._register_context(doc)
+        self.registerLocalFunctions(xsltCtxt, _register_xslt_function)
+        self.registerGlobalFunctions(xsltCtxt, _register_xslt_function)
+        _registerXSLTExtensions(xsltCtxt, self._extension_elements)
+
+    cdef free_context(self):
+        self._cleanup_context()
+        self._release_context()
+        if self._xsltCtxt is not NULL:
+            xslt.xsltFreeTransformContext(self._xsltCtxt)
+            self._xsltCtxt = NULL
+        self._release_temp_refs()
+
+
+@cython.final
+@cython.internal
+@cython.freelist(8)
+cdef class _XSLTQuotedStringParam:
+    """A wrapper class for literal XSLT string parameters that require
+    quote escaping.
+    """
+    cdef bytes strval
+    def __cinit__(self, strval):
+        self.strval = _utf8(strval)
+
+
+@cython.no_gc_clear
+cdef class XSLT:
+    """XSLT(self, xslt_input, extensions=None, regexp=True, access_control=None)
+
+    Turn an XSL document into an XSLT object.
+
+    Calling this object on a tree or Element will execute the XSLT::
+
+        transform = etree.XSLT(xsl_tree)
+        result = transform(xml_tree)
+
+    Keyword arguments of the constructor:
+
+    - extensions: a dict mapping ``(namespace, name)`` pairs to
+      extension functions or extension elements
+    - regexp: enable exslt regular expression support in XPath
+      (default: True)
+    - access_control: access restrictions for network or file
+      system (see `XSLTAccessControl`)
+
+    Keyword arguments of the XSLT call:
+
+    - profile_run: enable XSLT profiling and make the profile available
+      as XML document in ``result.xslt_profile`` (default: False)
+
+    Other keyword arguments of the call are passed to the stylesheet
+    as parameters.
+    """
+    cdef _XSLTContext _context
+    cdef xslt.xsltStylesheet* _c_style
+    cdef _XSLTResolverContext _xslt_resolver_context
+    cdef XSLTAccessControl _access_control
+    cdef _ErrorLog _error_log
+
+    def __cinit__(self):
+        self._c_style = NULL
+
+    def __init__(self, xslt_input, *, extensions=None, regexp=True,
+                 access_control=None):
+        cdef xslt.xsltStylesheet* c_style = NULL
+        cdef xmlDoc* c_doc
+        cdef _Document doc
+        cdef _Element root_node
+
+        doc = _documentOrRaise(xslt_input)
+        root_node = _rootNodeOrRaise(xslt_input)
+
+        # set access control or raise TypeError
+        self._access_control = access_control
+
+        # make a copy of the document as stylesheet parsing modifies it
+        c_doc = _copyDocRoot(doc._c_doc, root_node._c_node)
+
+        # make sure we always have a stylesheet URL
+        if c_doc.URL is NULL:
+            doc_url_utf = python.PyUnicode_AsASCIIString(
+                f"string://__STRING__XSLT__/{id(self)}.xslt")
+            c_doc.URL = tree.xmlStrdup(_xcstr(doc_url_utf))
+
+        self._error_log = _ErrorLog()
+        self._xslt_resolver_context = _XSLTResolverContext()
+        _initXSLTResolverContext(self._xslt_resolver_context, doc._parser)
+        # keep a copy in case we need to access the stylesheet via 'document()'
+        self._xslt_resolver_context._c_style_doc = _copyDoc(c_doc, 1)
+        c_doc._private = <python.PyObject*>self._xslt_resolver_context
+
+        with self._error_log:
+            orig_loader = _register_document_loader()
+            c_style = xslt.xsltParseStylesheetDoc(c_doc)
+            _reset_document_loader(orig_loader)
+
+        if c_style is NULL or c_style.errors:
+            tree.xmlFreeDoc(c_doc)
+            if c_style is not NULL:
+                xslt.xsltFreeStylesheet(c_style)
+            self._xslt_resolver_context._raise_if_stored()
+            # last error seems to be the most accurate here
+            if self._error_log.last_error is not None and \
+                    self._error_log.last_error.message:
+                raise XSLTParseError(self._error_log.last_error.message,
+                                     self._error_log)
+            else:
+                raise XSLTParseError(
+                    self._error_log._buildExceptionMessage(
+                        "Cannot parse stylesheet"),
+                    self._error_log)
+
+        c_doc._private = NULL # no longer used!
+        self._c_style = c_style
+        self._context = _XSLTContext(None, extensions, self._error_log, regexp, True)
+
+    def __dealloc__(self):
+        if self._xslt_resolver_context is not None and \
+               self._xslt_resolver_context._c_style_doc is not NULL:
+            tree.xmlFreeDoc(self._xslt_resolver_context._c_style_doc)
+        # this cleans up the doc copy as well
+        if self._c_style is not NULL:
+            xslt.xsltFreeStylesheet(self._c_style)
+
+    @property
+    def error_log(self):
+        """The log of errors and warnings of an XSLT execution."""
+        return self._error_log.copy()
+
+    @staticmethod
+    def strparam(strval):
+        """strparam(strval)
+
+        Mark an XSLT string parameter that requires quote escaping
+        before passing it into the transformation.  Use it like this::
+
+            result = transform(doc, some_strval = XSLT.strparam(
+                '''it's \"Monty Python's\" ...'''))
+
+        Escaped string parameters can be reused without restriction.
+        """
+        return _XSLTQuotedStringParam(strval)
+
+    @staticmethod
+    def set_global_max_depth(int max_depth):
+        """set_global_max_depth(max_depth)
+
+        The maximum traversal depth that the stylesheet engine will allow.
+        This does not only count the template recursion depth but also takes
+        the number of variables/parameters into account.  The required setting
+        for a run depends on both the stylesheet and the input data.
+
+        Example::
+
+            XSLT.set_global_max_depth(5000)
+
+        Note that this is currently a global, module-wide setting because
+        libxslt does not support it at a per-stylesheet level.
+        """
+        if max_depth < 0:
+            raise ValueError("cannot set a maximum stylesheet traversal depth < 0")
+        xslt.xsltMaxDepth = max_depth
+
+    def tostring(self, _ElementTree result_tree):
+        """tostring(self, result_tree)
+
+        Save result doc to string based on stylesheet output method.
+
+        :deprecated: use str(result_tree) instead.
+        """
+        return str(result_tree)
+
+    def __deepcopy__(self, memo):
+        return self.__copy__()
+
+    def __copy__(self):
+        return _copyXSLT(self)
+
+    def __call__(self, _input, *, profile_run=False, **kw):
+        """__call__(self, _input, profile_run=False, **kw)
+
+        Execute the XSL transformation on a tree or Element.
+
+        Pass the ``profile_run`` option to get profile information
+        about the XSLT.  The result of the XSLT will have a property
+        xslt_profile that holds an XML tree with profiling data.
+        """
+        cdef _XSLTContext context = None
+        cdef _XSLTResolverContext resolver_context
+        cdef _Document input_doc
+        cdef _Element root_node
+        cdef _Document result_doc
+        cdef _Document profile_doc = None
+        cdef xmlDoc* c_profile_doc
+        cdef xslt.xsltTransformContext* transform_ctxt
+        cdef xmlDoc* c_result = NULL
+        cdef xmlDoc* c_doc
+        cdef tree.xmlDict* c_dict
+        cdef const_char** params = NULL
+
+        assert self._c_style is not NULL, "XSLT stylesheet not initialised"
+        input_doc = _documentOrRaise(_input)
+        root_node = _rootNodeOrRaise(_input)
+
+        c_doc = _fakeRootDoc(input_doc._c_doc, root_node._c_node)
+
+        transform_ctxt = xslt.xsltNewTransformContext(self._c_style, c_doc)
+        if transform_ctxt is NULL:
+            _destroyFakeDoc(input_doc._c_doc, c_doc)
+            raise MemoryError()
+
+        # using the stylesheet dict is safer than using a possibly
+        # unrelated dict from the current thread.  Almost all
+        # non-input tag/attr names will come from the stylesheet
+        # anyway.
+        if transform_ctxt.dict is not NULL:
+            xmlparser.xmlDictFree(transform_ctxt.dict)
+        if kw:
+            # parameter values are stored in the dict
+            # => avoid unnecessarily cluttering the global dict
+            transform_ctxt.dict = xmlparser.xmlDictCreateSub(self._c_style.doc.dict)
+            if transform_ctxt.dict is NULL:
+                xslt.xsltFreeTransformContext(transform_ctxt)
+                raise MemoryError()
+        else:
+            transform_ctxt.dict = self._c_style.doc.dict
+            xmlparser.xmlDictReference(transform_ctxt.dict)
+
+        xslt.xsltSetCtxtParseOptions(
+            transform_ctxt, input_doc._parser._parse_options)
+
+        if profile_run:
+            transform_ctxt.profile = 1
+
+        try:
+            context = self._context._copy()
+            context.register_context(transform_ctxt, input_doc)
+
+            resolver_context = self._xslt_resolver_context._copy()
+            transform_ctxt._private = <python.PyObject*>resolver_context
+
+            _convert_xslt_parameters(transform_ctxt, kw, &params)
+            c_result = self._run_transform(
+                c_doc, params, context, transform_ctxt)
+            if params is not NULL:
+                # deallocate space for parameters
+                python.lxml_free(params)
+
+            if transform_ctxt.state != xslt.XSLT_STATE_OK:
+                if c_result is not NULL:
+                    tree.xmlFreeDoc(c_result)
+                    c_result = NULL
+
+            if transform_ctxt.profile:
+                c_profile_doc = xslt.xsltGetProfileInformation(transform_ctxt)
+                if c_profile_doc is not NULL:
+                    profile_doc = _documentFactory(
+                        c_profile_doc, input_doc._parser)
+        finally:
+            if context is not None:
+                context.free_context()
+            _destroyFakeDoc(input_doc._c_doc, c_doc)
+
+        try:
+            if resolver_context is not None and resolver_context._has_raised():
+                if c_result is not NULL:
+                    tree.xmlFreeDoc(c_result)
+                    c_result = NULL
+                resolver_context._raise_if_stored()
+
+            if context._exc._has_raised():
+                if c_result is not NULL:
+                    tree.xmlFreeDoc(c_result)
+                    c_result = NULL
+                context._exc._raise_if_stored()
+
+            if c_result is NULL:
+                # last error seems to be the most accurate here
+                error = self._error_log.last_error
+                if error is not None and error.message:
+                    if error.line > 0:
+                        message = f"{error.message}, line {error.line}"
+                    else:
+                        message = error.message
+                elif error is not None and error.line > 0:
+                    message = f"Error applying stylesheet, line {error.line}"
+                else:
+                    message = "Error applying stylesheet"
+                raise XSLTApplyError(message, self._error_log)
+        finally:
+            if resolver_context is not None:
+                resolver_context.clear()
+
+        result_doc = _documentFactory(c_result, input_doc._parser)
+
+        c_dict = c_result.dict
+        xmlparser.xmlDictReference(c_dict)
+        __GLOBAL_PARSER_CONTEXT.initThreadDictRef(&c_result.dict)
+        if c_dict is not c_result.dict or \
+                self._c_style.doc.dict is not c_result.dict or \
+                input_doc._c_doc.dict is not c_result.dict:
+            with nogil:
+                if c_dict is not c_result.dict:
+                    fixThreadDictNames(<xmlNode*>c_result,
+                                       c_dict, c_result.dict)
+                if self._c_style.doc.dict is not c_result.dict:
+                    fixThreadDictNames(<xmlNode*>c_result,
+                                       self._c_style.doc.dict, c_result.dict)
+                if input_doc._c_doc.dict is not c_result.dict:
+                    fixThreadDictNames(<xmlNode*>c_result,
+                                       input_doc._c_doc.dict, c_result.dict)
+        xmlparser.xmlDictFree(c_dict)
+
+        return _xsltResultTreeFactory(result_doc, self, profile_doc)
+
+    cdef xmlDoc* _run_transform(self, xmlDoc* c_input_doc,
+                                const_char** params, _XSLTContext context,
+                                xslt.xsltTransformContext* transform_ctxt):
+        cdef xmlDoc* c_result
+        xslt.xsltSetTransformErrorFunc(transform_ctxt, <void*>self._error_log,
+                                       <xmlerror.xmlGenericErrorFunc>_receiveXSLTError)
+        if self._access_control is not None:
+            self._access_control._register_in_context(transform_ctxt)
+        with self._error_log, nogil:
+            orig_loader = _register_document_loader()
+            c_result = xslt.xsltApplyStylesheetUser(
+                self._c_style, c_input_doc, params, NULL, NULL, transform_ctxt)
+            _reset_document_loader(orig_loader)
+        return c_result
+
+
+cdef _convert_xslt_parameters(xslt.xsltTransformContext* transform_ctxt,
+                              dict parameters, const_char*** params_ptr):
+    cdef Py_ssize_t i, parameter_count
+    cdef const_char** params
+    cdef tree.xmlDict* c_dict = transform_ctxt.dict
+    params_ptr[0] = NULL
+    parameter_count = len(parameters)
+    if parameter_count == 0:
+        return
+    # allocate space for parameters
+    # * 2 as we want an entry for both key and value,
+    # and + 1 as array is NULL terminated
+    params = <const_char**>python.lxml_malloc(parameter_count * 2 + 1, sizeof(const_char*))
+    if not params:
+        raise MemoryError()
+    try:
+        i = 0
+        for key, value in parameters.iteritems():
+            k = _utf8(key)
+            if isinstance(value, _XSLTQuotedStringParam):
+                v = (<_XSLTQuotedStringParam>value).strval
+                xslt.xsltQuoteOneUserParam(
+                    transform_ctxt, _xcstr(k), _xcstr(v))
+            else:
+                if isinstance(value, XPath):
+                    v = (<XPath>value)._path
+                else:
+                    v = _utf8(value)
+                params[i] = <const_char*>tree.xmlDictLookup(c_dict, _xcstr(k), len(k))
+                i += 1
+                params[i] = <const_char*>tree.xmlDictLookup(c_dict, _xcstr(v), len(v))
+                i += 1
+    except:
+        python.lxml_free(params)
+        raise
+    params[i] = NULL
+    params_ptr[0] = params
+
+cdef XSLT _copyXSLT(XSLT stylesheet):
+    cdef XSLT new_xslt
+    cdef xmlDoc* c_doc
+    assert stylesheet._c_style is not NULL, "XSLT stylesheet not initialised"
+    new_xslt = XSLT.__new__(XSLT)
+    new_xslt._access_control = stylesheet._access_control
+    new_xslt._error_log = _ErrorLog()
+    new_xslt._context = stylesheet._context._copy()
+
+    new_xslt._xslt_resolver_context = stylesheet._xslt_resolver_context._copy()
+    new_xslt._xslt_resolver_context._c_style_doc = _copyDoc(
+        stylesheet._xslt_resolver_context._c_style_doc, 1)
+
+    c_doc = _copyDoc(stylesheet._c_style.doc, 1)
+    new_xslt._c_style = xslt.xsltParseStylesheetDoc(c_doc)
+    if new_xslt._c_style is NULL:
+        tree.xmlFreeDoc(c_doc)
+        raise MemoryError()
+
+    return new_xslt
+
+@cython.final
+cdef class _XSLTResultTree(_ElementTree):
+    """The result of an XSLT evaluation.
+
+    Use ``str()`` or ``bytes()`` (or ``unicode()`` in Python 2.x) to serialise to a string,
+    and the ``.write_output()`` method to write serialise to a file.
+    """
+    cdef XSLT _xslt
+    cdef _Document _profile
+    cdef xmlChar* _buffer
+    cdef Py_ssize_t _buffer_len
+    cdef Py_ssize_t _buffer_refcnt
+
+    def write_output(self, file, *, compression=0):
+        """write_output(self, file, *, compression=0)
+
+        Serialise the XSLT output to a file or file-like object.
+
+        As opposed to the generic ``.write()`` method, ``.write_output()`` serialises
+        the result as defined by the ``<xsl:output>`` tag.
+        """
+        cdef _FilelikeWriter writer = None
+        cdef _Document doc
+        cdef int r, rclose, c_compression
+        cdef const_xmlChar* c_encoding = NULL
+        cdef tree.xmlOutputBuffer* c_buffer
+
+        if self._context_node is not None:
+            doc = self._context_node._doc
+        else:
+            doc = None
+        if doc is None:
+            doc = self._doc
+            if doc is None:
+                raise XSLTSaveError("No document to serialise")
+        c_compression = compression or 0
+        xslt.LXML_GET_XSLT_ENCODING(c_encoding, self._xslt._c_style)
+        writer = _create_output_buffer(file, <const_char*>c_encoding, compression, &c_buffer, close=False)
+        if writer is None:
+            with nogil:
+                r = xslt.xsltSaveResultTo(c_buffer, doc._c_doc, self._xslt._c_style)
+                rclose = tree.xmlOutputBufferClose(c_buffer)
+        else:
+            r = xslt.xsltSaveResultTo(c_buffer, doc._c_doc, self._xslt._c_style)
+            rclose = tree.xmlOutputBufferClose(c_buffer)
+        if writer is not None:
+            writer._exc_context._raise_if_stored()
+        if r < 0 or rclose == -1:
+            python.PyErr_SetFromErrno(IOError)  # raises IOError
+
+    cdef _saveToStringAndSize(self, xmlChar** s, int* l):
+        cdef _Document doc
+        cdef int r
+        if self._context_node is not None:
+            doc = self._context_node._doc
+        else:
+            doc = None
+        if doc is None:
+            doc = self._doc
+            if doc is None:
+                s[0] = NULL
+                return
+        with nogil:
+            r = xslt.xsltSaveResultToString(s, l, doc._c_doc,
+                                            self._xslt._c_style)
+        if r == -1:
+            raise MemoryError()
+
+    def __str__(self):
+        cdef xmlChar* encoding
+        cdef xmlChar* s = NULL
+        cdef int l = 0
+        self._saveToStringAndSize(&s, &l)
+        if s is NULL:
+            return ''
+        encoding = self._xslt._c_style.encoding
+        try:
+            if encoding is NULL:
+                result = s[:l].decode('UTF-8')
+            else:
+                result = s[:l].decode(encoding)
+        finally:
+            tree.xmlFree(s)
+        return _stripEncodingDeclaration(result)
+
+    def __getbuffer__(self, Py_buffer* buffer, int flags):
+        cdef int l = 0
+        if buffer is NULL:
+            return
+        if self._buffer is NULL or flags & python.PyBUF_WRITABLE:
+            self._saveToStringAndSize(<xmlChar**>&buffer.buf, &l)
+            buffer.len = l
+            if self._buffer is NULL and not flags & python.PyBUF_WRITABLE:
+                self._buffer = <xmlChar*>buffer.buf
+                self._buffer_len = l
+                self._buffer_refcnt = 1
+        else:
+            buffer.buf = self._buffer
+            buffer.len = self._buffer_len
+            self._buffer_refcnt += 1
+        if flags & python.PyBUF_WRITABLE:
+            buffer.readonly = 0
+        else:
+            buffer.readonly = 1
+        if flags & python.PyBUF_FORMAT:
+            buffer.format = "B"
+        else:
+            buffer.format = NULL
+        buffer.ndim = 0
+        buffer.shape = NULL
+        buffer.strides = NULL
+        buffer.suboffsets = NULL
+        buffer.itemsize = 1
+        buffer.internal = NULL
+        if buffer.obj is not self: # set by Cython?
+            buffer.obj = self
+
+    def __releasebuffer__(self, Py_buffer* buffer):
+        if buffer is NULL:
+            return
+        if <xmlChar*>buffer.buf is self._buffer:
+            self._buffer_refcnt -= 1
+            if self._buffer_refcnt == 0:
+                tree.xmlFree(<char*>self._buffer)
+                self._buffer = NULL
+        else:
+            tree.xmlFree(<char*>buffer.buf)
+        buffer.buf = NULL
+
+    property xslt_profile:
+        """Return an ElementTree with profiling data for the stylesheet run.
+        """
+        def __get__(self):
+            cdef object root
+            if self._profile is None:
+                return None
+            root = self._profile.getroot()
+            if root is None:
+                return None
+            return ElementTree(root)
+
+        def __del__(self):
+            self._profile = None
+
+cdef _xsltResultTreeFactory(_Document doc, XSLT xslt, _Document profile):
+    cdef _XSLTResultTree result
+    result = <_XSLTResultTree>_newElementTree(doc, None, _XSLTResultTree)
+    result._xslt = xslt
+    result._profile = profile
+    return result
+
+# functions like "output" and "write" are a potential security risk, but we
+# rely on the user to configure XSLTAccessControl as needed
+xslt.xsltRegisterAllExtras()
+
+# enable EXSLT support for XSLT
+xslt.exsltRegisterAll()
+
+
+################################################################################
+# XSLT PI support
+
+cdef object _RE_PI_HREF = re.compile(r'\s+href\s*=\s*(?:\'([^\']*)\'|"([^"]*)")')
+cdef object _FIND_PI_HREF = _RE_PI_HREF.findall
+cdef object _REPLACE_PI_HREF = _RE_PI_HREF.sub
+cdef XPath __findStylesheetByID = None
+
+cdef _findStylesheetByID(_Document doc, id):
+    global __findStylesheetByID
+    if __findStylesheetByID is None:
+        __findStylesheetByID = XPath(
+            "//xsl:stylesheet[@xml:id = $id]",
+            namespaces={"xsl" : "http://www.w3.org/1999/XSL/Transform"})
+    return __findStylesheetByID(doc, id=id)
+
+cdef class _XSLTProcessingInstruction(PIBase):
+    def parseXSL(self, parser=None):
+        """parseXSL(self, parser=None)
+
+        Try to parse the stylesheet referenced by this PI and return
+        an ElementTree for it.  If the stylesheet is embedded in the
+        same document (referenced via xml:id), find and return an
+        ElementTree for the stylesheet Element.
+
+        The optional ``parser`` keyword argument can be passed to specify the
+        parser used to read from external stylesheet URLs.
+        """
+        cdef _Document result_doc
+        cdef _Element  result_node
+        cdef bytes href_utf
+        cdef const_xmlChar* c_href
+        cdef xmlAttr* c_attr
+        _assertValidNode(self)
+        if self._c_node.content is NULL:
+            raise ValueError, "PI lacks content"
+        hrefs = _FIND_PI_HREF(' ' + (<unsigned char*>self._c_node.content).decode('UTF-8'))
+        if len(hrefs) != 1:
+            raise ValueError, "malformed PI attributes"
+        hrefs = hrefs[0]
+        href_utf = utf8(hrefs[0] or hrefs[1])
+        c_href = _xcstr(href_utf)
+
+        if c_href[0] != c'#':
+            # normal URL, try to parse from it
+            c_href = tree.xmlBuildURI(
+                c_href,
+                tree.xmlNodeGetBase(self._c_node.doc, self._c_node))
+            if c_href is not NULL:
+                try:
+                    href_utf = <unsigned char*>c_href
+                finally:
+                    tree.xmlFree(<char*>c_href)
+            result_doc = _parseDocumentFromURL(href_utf, parser)
+            return _elementTreeFactory(result_doc, None)
+
+        # ID reference to embedded stylesheet
+        # try XML:ID lookup
+        _assertValidDoc(self._doc)
+        c_href += 1 # skip leading '#'
+        c_attr = tree.xmlGetID(self._c_node.doc, c_href)
+        if c_attr is not NULL and c_attr.doc is self._c_node.doc:
+            result_node = _elementFactory(self._doc, c_attr.parent)
+            return _elementTreeFactory(result_node._doc, result_node)
+
+        # try XPath search
+        root = _findStylesheetByID(self._doc, funicode(c_href))
+        if not root:
+            raise ValueError, "reference to non-existing embedded stylesheet"
+        elif len(root) > 1:
+            raise ValueError, "ambiguous reference to embedded stylesheet"
+        result_node = root[0]
+        return _elementTreeFactory(result_node._doc, result_node)
+
+    def set(self, key, value):
+        """set(self, key, value)
+
+        Supports setting the 'href' pseudo-attribute in the text of
+        the processing instruction.
+        """
+        if key != "href":
+            raise AttributeError, \
+                "only setting the 'href' attribute is supported on XSLT-PIs"
+        if value is None:
+            attrib = ""
+        elif '"' in value or '>' in value:
+            raise ValueError, "Invalid URL, must not contain '\"' or '>'"
+        else:
+            attrib = f' href="{value}"'
+        text = ' ' + self.text
+        if _FIND_PI_HREF(text):
+            self.text = _REPLACE_PI_HREF(attrib, text)
+        else:
+            self.text = text + attrib

llmeval-env/lib/python3.10/site-packages/lxml/xsltext.pxi

@@ -0,0 +1,242 @@
+# XSLT extension elements
+
+cdef class XSLTExtension:
+    """Base class of an XSLT extension element.
+    """
+    def execute(self, context, self_node, input_node, output_parent):
+        """execute(self, context, self_node, input_node, output_parent)
+        Execute this extension element.
+
+        Subclasses must override this method.  They may append
+        elements to the `output_parent` element here, or set its text
+        content.  To this end, the `input_node` provides read-only
+        access to the current node in the input document, and the
+        `self_node` points to the extension element in the stylesheet.
+
+        Note that the `output_parent` parameter may be `None` if there
+        is no parent element in the current context (e.g. no content
+        was added to the output tree yet).
+        """
+        pass
+
+    def apply_templates(self, _XSLTContext context not None, node, output_parent=None,
+                        *, elements_only=False, remove_blank_text=False):
+        """apply_templates(self, context, node, output_parent=None, elements_only=False, remove_blank_text=False)
+
+        Call this method to retrieve the result of applying templates
+        to an element.
+
+        The return value is a list of elements or text strings that
+        were generated by the XSLT processor.  If you pass
+        ``elements_only=True``, strings will be discarded from the result
+        list.  The option ``remove_blank_text=True`` will only discard
+        strings that consist entirely of whitespace (e.g. formatting).
+        These options do not apply to Elements, only to bare string results.
+
+        If you pass an Element as `output_parent` parameter, the result
+        will instead be appended to the element (including attributes
+        etc.) and the return value will be `None`.  This is a safe way
+        to generate content into the output document directly, without
+        having to take care of special values like text or attributes.
+        Note that the string discarding options will be ignored in this
+        case.
+        """
+        cdef xmlNode* c_parent
+        cdef xmlNode* c_node
+        cdef xmlNode* c_context_node
+        assert context._xsltCtxt is not NULL, "XSLT context not initialised"
+        c_context_node = _roNodeOf(node)
+        #assert c_context_node.doc is context._xsltContext.node.doc, \
+        #    "switching input documents during transformation is not currently supported"
+
+        if output_parent is not None:
+            c_parent = _nonRoNodeOf(output_parent)
+        else:
+            c_parent = tree.xmlNewDocNode(
+                context._xsltCtxt.output, NULL, <unsigned char*>"fake-parent", NULL)
+
+        c_node = context._xsltCtxt.insert
+        context._xsltCtxt.insert = c_parent
+        xslt.xsltProcessOneNode(
+            context._xsltCtxt, c_context_node, NULL)
+        context._xsltCtxt.insert = c_node
+
+        if output_parent is not None:
+            return None
+
+        try:
+            return self._collectXSLTResultContent(
+                context, c_parent, elements_only, remove_blank_text)
+        finally:
+            # free all intermediate nodes that will not be freed by proxies
+            tree.xmlFreeNode(c_parent)
+
+    def process_children(self, _XSLTContext context not None, output_parent=None,
+                         *, elements_only=False, remove_blank_text=False):
+        """process_children(self, context, output_parent=None, elements_only=False, remove_blank_text=False)
+
+        Call this method to process the XSLT content of the extension
+        element itself.
+
+        The return value is a list of elements or text strings that
+        were generated by the XSLT processor.  If you pass
+        ``elements_only=True``, strings will be discarded from the result
+        list.  The option ``remove_blank_text=True`` will only discard
+        strings that consist entirely of whitespace (e.g. formatting).
+        These options do not apply to Elements, only to bare string results.
+
+        If you pass an Element as `output_parent` parameter, the result
+        will instead be appended to the element (including attributes
+        etc.) and the return value will be `None`.  This is a safe way
+        to generate content into the output document directly, without
+        having to take care of special values like text or attributes.
+        Note that the string discarding options will be ignored in this
+        case.
+        """
+        cdef xmlNode* c_parent
+        cdef xslt.xsltTransformContext* c_ctxt = context._xsltCtxt
+        cdef xmlNode* c_old_output_parent = c_ctxt.insert
+        assert context._xsltCtxt is not NULL, "XSLT context not initialised"
+
+        # output_parent node is used for adding results instead of
+        # elements list used in apply_templates, that's easier and allows to
+        # use attributes added to extension element with <xsl:attribute>.
+
+        if output_parent is not None:
+            c_parent = _nonRoNodeOf(output_parent)
+        else:
+            c_parent = tree.xmlNewDocNode(
+                context._xsltCtxt.output, NULL, <unsigned char*>"fake-parent", NULL)
+
+        c_ctxt.insert = c_parent
+        xslt.xsltApplyOneTemplate(c_ctxt,
+            c_ctxt.node, c_ctxt.inst.children, NULL, NULL)
+        c_ctxt.insert = c_old_output_parent
+
+        if output_parent is not None:
+            return None
+
+        try:
+            return self._collectXSLTResultContent(
+                context, c_parent, elements_only, remove_blank_text)
+        finally:
+            # free all intermediate nodes that will not be freed by proxies
+            tree.xmlFreeNode(c_parent)
+
+    cdef _collectXSLTResultContent(self, _XSLTContext context, xmlNode* c_parent,
+                                   bint elements_only, bint remove_blank_text):
+        cdef xmlNode* c_node
+        cdef xmlNode* c_next
+        cdef _ReadOnlyProxy proxy
+        cdef list results = [] # or maybe _collectAttributes(c_parent, 2) ?
+        c_node = c_parent.children
+        while c_node is not NULL:
+            c_next = c_node.next
+            if c_node.type == tree.XML_TEXT_NODE:
+                if not elements_only:
+                    s = funicode(c_node.content)
+                    if not remove_blank_text or s.strip():
+                        results.append(s)
+                    s = None
+            elif c_node.type == tree.XML_ELEMENT_NODE:
+                proxy = _newReadOnlyProxy(
+                    context._extension_element_proxy, c_node)
+                results.append(proxy)
+                # unlink node and make sure it will be freed later on
+                tree.xmlUnlinkNode(c_node)
+                proxy.free_after_use()
+            else:
+                raise TypeError, \
+                    f"unsupported XSLT result type: {c_node.type}"
+            c_node = c_next
+        return results
+
+
+cdef _registerXSLTExtensions(xslt.xsltTransformContext* c_ctxt,
+                             extension_dict):
+    for ns_utf, name_utf in extension_dict:
+        xslt.xsltRegisterExtElement(
+            c_ctxt, _xcstr(name_utf), _xcstr(ns_utf),
+            <xslt.xsltTransformFunction>_callExtensionElement)
+
+cdef void _callExtensionElement(xslt.xsltTransformContext* c_ctxt,
+                                xmlNode* c_context_node,
+                                xmlNode* c_inst_node,
+                                void* dummy) noexcept with gil:
+    cdef _XSLTContext context
+    cdef XSLTExtension extension
+    cdef python.PyObject* dict_result
+    cdef xmlNode* c_node
+    cdef _ReadOnlyProxy context_node = None, self_node = None
+    cdef object output_parent # not restricted to ro-nodes
+    c_uri = _getNs(c_inst_node)
+    if c_uri is NULL:
+        # not allowed, and should never happen
+        return
+    if c_ctxt.xpathCtxt.userData is NULL:
+        # just for safety, should never happen
+        return
+    context = <_XSLTContext>c_ctxt.xpathCtxt.userData
+    try:
+        try:
+            dict_result = python.PyDict_GetItem(
+                context._extension_elements, (c_uri, c_inst_node.name))
+            if dict_result is NULL:
+                raise KeyError, f"extension element {funicode(c_inst_node.name)} not found"
+            extension = <object>dict_result
+
+            try:
+                # build the context proxy nodes
+                self_node = _newReadOnlyProxy(None, c_inst_node)
+                if _isElement(c_ctxt.insert):
+                    output_parent = _newAppendOnlyProxy(self_node, c_ctxt.insert)
+                else:
+                    # may be the document node or other stuff
+                    output_parent = _newOpaqueAppendOnlyNodeWrapper(c_ctxt.insert)
+                if c_context_node.type in (tree.XML_DOCUMENT_NODE,
+                                           tree.XML_HTML_DOCUMENT_NODE):
+                    c_node = tree.xmlDocGetRootElement(<xmlDoc*>c_context_node)
+                    if c_node is not NULL:
+                        context_node = _newReadOnlyProxy(self_node, c_node)
+                    else:
+                        context_node = None
+                elif c_context_node.type in (tree.XML_ATTRIBUTE_NODE,
+                                             tree.XML_TEXT_NODE,
+                                             tree.XML_CDATA_SECTION_NODE):
+                    # this isn't easy to support using read-only
+                    # nodes, as the smart-string factory must
+                    # instantiate the parent proxy somehow...
+                    raise TypeError(f"Unsupported element type: {c_context_node.type}")
+                else:
+                    context_node  = _newReadOnlyProxy(self_node, c_context_node)
+
+                # run the XSLT extension
+                context._extension_element_proxy = self_node
+                extension.execute(context, self_node, context_node, output_parent)
+            finally:
+                context._extension_element_proxy = None
+                if self_node is not None:
+                    _freeReadOnlyProxies(self_node)
+        except Exception as e:
+            try:
+                e = unicode(e).encode("UTF-8")
+            except:
+                e = repr(e).encode("UTF-8")
+            message = python.PyBytes_FromFormat(
+                "Error executing extension element '%s': %s",
+                c_inst_node.name, _cstr(e))
+            xslt.xsltTransformError(c_ctxt, NULL, c_inst_node, "%s", message)
+            context._exc._store_raised()
+        except:
+            # just in case
+            message = python.PyBytes_FromFormat(
+                "Error executing extension element '%s'", c_inst_node.name)
+            xslt.xsltTransformError(c_ctxt, NULL, c_inst_node, "%s", message)
+            context._exc._store_raised()
+    except:
+        # no Python functions here - everything can fail...
+        xslt.xsltTransformError(c_ctxt, NULL, c_inst_node,
+                                "Error during XSLT extension element evaluation")
+        context._exc._store_raised()
+    finally:
+        return  # swallow any further exceptions

llmeval-env/lib/python3.10/site-packages/scikit_learn-1.4.2.dist-info/INSTALLER

@@ -0,0 +1 @@
+pip

llmeval-env/lib/python3.10/site-packages/scikit_learn-1.4.2.dist-info/METADATA

@@ -0,0 +1,282 @@
+Metadata-Version: 2.1
+Name: scikit-learn
+Version: 1.4.2
+Summary: A set of python modules for machine learning and data mining
+Home-page: https://scikit-learn.org
+Download-URL: https://pypi.org/project/scikit-learn/#files
+Maintainer: Andreas Mueller
+Maintainer-email: [email protected]
+License: new BSD
+Project-URL: Bug Tracker, https://github.com/scikit-learn/scikit-learn/issues
+Project-URL: Documentation, https://scikit-learn.org/stable/documentation.html
+Project-URL: Source Code, https://github.com/scikit-learn/scikit-learn
+Classifier: Intended Audience :: Science/Research
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: BSD License
+Classifier: Programming Language :: C
+Classifier: Programming Language :: Python
+Classifier: Topic :: Software Development
+Classifier: Topic :: Scientific/Engineering
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Operating System :: Microsoft :: Windows
+Classifier: Operating System :: POSIX
+Classifier: Operating System :: Unix
+Classifier: Operating System :: MacOS
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: 3.11
+Classifier: Programming Language :: Python :: 3.12
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Requires-Python: >=3.9
+License-File: COPYING
+Requires-Dist: numpy >=1.19.5
+Requires-Dist: scipy >=1.6.0
+Requires-Dist: joblib >=1.2.0
+Requires-Dist: threadpoolctl >=2.0.0
+Provides-Extra: benchmark
+Requires-Dist: matplotlib >=3.3.4 ; extra == 'benchmark'
+Requires-Dist: pandas >=1.1.5 ; extra == 'benchmark'
+Requires-Dist: memory-profiler >=0.57.0 ; extra == 'benchmark'
+Provides-Extra: docs
+Requires-Dist: matplotlib >=3.3.4 ; extra == 'docs'
+Requires-Dist: scikit-image >=0.17.2 ; extra == 'docs'
+Requires-Dist: pandas >=1.1.5 ; extra == 'docs'
+Requires-Dist: seaborn >=0.9.0 ; extra == 'docs'
+Requires-Dist: memory-profiler >=0.57.0 ; extra == 'docs'
+Requires-Dist: sphinx >=6.0.0 ; extra == 'docs'
+Requires-Dist: sphinx-copybutton >=0.5.2 ; extra == 'docs'
+Requires-Dist: sphinx-gallery >=0.15.0 ; extra == 'docs'
+Requires-Dist: numpydoc >=1.2.0 ; extra == 'docs'
+Requires-Dist: Pillow >=7.1.2 ; extra == 'docs'
+Requires-Dist: pooch >=1.6.0 ; extra == 'docs'
+Requires-Dist: sphinx-prompt >=1.3.0 ; extra == 'docs'
+Requires-Dist: sphinxext-opengraph >=0.4.2 ; extra == 'docs'
+Requires-Dist: plotly >=5.14.0 ; extra == 'docs'
+Provides-Extra: examples
+Requires-Dist: matplotlib >=3.3.4 ; extra == 'examples'
+Requires-Dist: scikit-image >=0.17.2 ; extra == 'examples'
+Requires-Dist: pandas >=1.1.5 ; extra == 'examples'
+Requires-Dist: seaborn >=0.9.0 ; extra == 'examples'
+Requires-Dist: pooch >=1.6.0 ; extra == 'examples'
+Requires-Dist: plotly >=5.14.0 ; extra == 'examples'
+Provides-Extra: tests
+Requires-Dist: matplotlib >=3.3.4 ; extra == 'tests'
+Requires-Dist: scikit-image >=0.17.2 ; extra == 'tests'
+Requires-Dist: pandas >=1.1.5 ; extra == 'tests'
+Requires-Dist: pytest >=7.1.2 ; extra == 'tests'
+Requires-Dist: pytest-cov >=2.9.0 ; extra == 'tests'
+Requires-Dist: ruff >=0.0.272 ; extra == 'tests'
+Requires-Dist: black >=23.3.0 ; extra == 'tests'
+Requires-Dist: mypy >=1.3 ; extra == 'tests'
+Requires-Dist: pyamg >=4.0.0 ; extra == 'tests'
+Requires-Dist: polars >=0.19.12 ; extra == 'tests'
+Requires-Dist: pyarrow >=12.0.0 ; extra == 'tests'
+Requires-Dist: numpydoc >=1.2.0 ; extra == 'tests'
+Requires-Dist: pooch >=1.6.0 ; extra == 'tests'
+
+.. -*- mode: rst -*-
+
+|Azure|_ |CirrusCI|_ |Codecov|_ |CircleCI|_ |Nightly wheels|_ |Black|_ |PythonVersion|_ |PyPi|_ |DOI|_ |Benchmark|_
+
+.. |Azure| image:: https://dev.azure.com/scikit-learn/scikit-learn/_apis/build/status/scikit-learn.scikit-learn?branchName=main
+.. _Azure: https://dev.azure.com/scikit-learn/scikit-learn/_build/latest?definitionId=1&branchName=main
+
+.. |CircleCI| image:: https://circleci.com/gh/scikit-learn/scikit-learn/tree/main.svg?style=shield
+.. _CircleCI: https://circleci.com/gh/scikit-learn/scikit-learn
+
+.. |CirrusCI| image:: https://img.shields.io/cirrus/github/scikit-learn/scikit-learn/main?label=Cirrus%20CI
+.. _CirrusCI: https://cirrus-ci.com/github/scikit-learn/scikit-learn/main
+
+.. |Codecov| image:: https://codecov.io/gh/scikit-learn/scikit-learn/branch/main/graph/badge.svg?token=Pk8G9gg3y9
+.. _Codecov: https://codecov.io/gh/scikit-learn/scikit-learn
+
+.. |Nightly wheels| image:: https://github.com/scikit-learn/scikit-learn/workflows/Wheel%20builder/badge.svg?event=schedule
+.. _`Nightly wheels`: https://github.com/scikit-learn/scikit-learn/actions?query=workflow%3A%22Wheel+builder%22+event%3Aschedule
+
+.. |PythonVersion| image:: https://img.shields.io/pypi/pyversions/scikit-learn.svg
+.. _PythonVersion: https://pypi.org/project/scikit-learn/
+
+.. |PyPi| image:: https://img.shields.io/pypi/v/scikit-learn
+.. _PyPi: https://pypi.org/project/scikit-learn
+
+.. |Black| image:: https://img.shields.io/badge/code%20style-black-000000.svg
+.. _Black: https://github.com/psf/black
+
+.. |DOI| image:: https://zenodo.org/badge/21369/scikit-learn/scikit-learn.svg
+.. _DOI: https://zenodo.org/badge/latestdoi/21369/scikit-learn/scikit-learn
+
+.. |Benchmark| image:: https://img.shields.io/badge/Benchmarked%20by-asv-blue
+.. _`Benchmark`: https://scikit-learn.org/scikit-learn-benchmarks/
+
+.. |PythonMinVersion| replace:: 3.9
+.. |NumPyMinVersion| replace:: 1.19.5
+.. |SciPyMinVersion| replace:: 1.6.0
+.. |JoblibMinVersion| replace:: 1.2.0
+.. |ThreadpoolctlMinVersion| replace:: 2.0.0
+.. |MatplotlibMinVersion| replace:: 3.3.4
+.. |Scikit-ImageMinVersion| replace:: 0.17.2
+.. |PandasMinVersion| replace:: 1.1.5
+.. |SeabornMinVersion| replace:: 0.9.0
+.. |PytestMinVersion| replace:: 7.1.2
+.. |PlotlyMinVersion| replace:: 5.14.0
+
+.. image:: https://raw.githubusercontent.com/scikit-learn/scikit-learn/main/doc/logos/scikit-learn-logo.png
+  :target: https://scikit-learn.org/
+
+**scikit-learn** is a Python module for machine learning built on top of
+SciPy and is distributed under the 3-Clause BSD license.
+
+The project was started in 2007 by David Cournapeau as a Google Summer
+of Code project, and since then many volunteers have contributed. See
+the `About us <https://scikit-learn.org/dev/about.html#authors>`__ page
+for a list of core contributors.
+
+It is currently maintained by a team of volunteers.
+
+Website: https://scikit-learn.org
+
+Installation
+------------
+
+Dependencies
+~~~~~~~~~~~~
+
+scikit-learn requires:
+
+- Python (>= |PythonMinVersion|)
+- NumPy (>= |NumPyMinVersion|)
+- SciPy (>= |SciPyMinVersion|)
+- joblib (>= |JoblibMinVersion|)
+- threadpoolctl (>= |ThreadpoolctlMinVersion|)
+
+=======
+
+**Scikit-learn 0.20 was the last version to support Python 2.7 and Python 3.4.**
+scikit-learn 1.0 and later require Python 3.7 or newer.
+scikit-learn 1.1 and later require Python 3.8 or newer.
+
+Scikit-learn plotting capabilities (i.e., functions start with ``plot_`` and
+classes end with ``Display``) require Matplotlib (>= |MatplotlibMinVersion|).
+For running the examples Matplotlib >= |MatplotlibMinVersion| is required.
+A few examples require scikit-image >= |Scikit-ImageMinVersion|, a few examples
+require pandas >= |PandasMinVersion|, some examples require seaborn >=
+|SeabornMinVersion| and plotly >= |PlotlyMinVersion|.
+
+User installation
+~~~~~~~~~~~~~~~~~
+
+If you already have a working installation of NumPy and SciPy,
+the easiest way to install scikit-learn is using ``pip``::
+
+    pip install -U scikit-learn
+
+or ``conda``::
+
+    conda install -c conda-forge scikit-learn
+
+The documentation includes more detailed `installation instructions <https://scikit-learn.org/stable/install.html>`_.
+
+
+Changelog
+---------
+
+See the `changelog <https://scikit-learn.org/dev/whats_new.html>`__
+for a history of notable changes to scikit-learn.
+
+Development
+-----------
+
+We welcome new contributors of all experience levels. The scikit-learn
+community goals are to be helpful, welcoming, and effective. The
+`Development Guide <https://scikit-learn.org/stable/developers/index.html>`_
+has detailed information about contributing code, documentation, tests, and
+more. We've included some basic information in this README.
+
+Important links
+~~~~~~~~~~~~~~~
+
+- Official source code repo: https://github.com/scikit-learn/scikit-learn
+- Download releases: https://pypi.org/project/scikit-learn/
+- Issue tracker: https://github.com/scikit-learn/scikit-learn/issues
+
+Source code
+~~~~~~~~~~~
+
+You can check the latest sources with the command::
+
+    git clone https://github.com/scikit-learn/scikit-learn.git
+
+Contributing
+~~~~~~~~~~~~
+
+To learn more about making a contribution to scikit-learn, please see our
+`Contributing guide
+<https://scikit-learn.org/dev/developers/contributing.html>`_.
+
+Testing
+~~~~~~~
+
+After installation, you can launch the test suite from outside the source
+directory (you will need to have ``pytest`` >= |PyTestMinVersion| installed)::
+
+    pytest sklearn
+
+See the web page https://scikit-learn.org/dev/developers/contributing.html#testing-and-improving-test-coverage
+for more information.
+
+    Random number generation can be controlled during testing by setting
+    the ``SKLEARN_SEED`` environment variable.
+
+Submitting a Pull Request
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Before opening a Pull Request, have a look at the
+full Contributing page to make sure your code complies
+with our guidelines: https://scikit-learn.org/stable/developers/index.html
+
+Project History
+---------------
+
+The project was started in 2007 by David Cournapeau as a Google Summer
+of Code project, and since then many volunteers have contributed. See
+the `About us <https://scikit-learn.org/dev/about.html#authors>`__ page
+for a list of core contributors.
+
+The project is currently maintained by a team of volunteers.
+
+**Note**: `scikit-learn` was previously referred to as `scikits.learn`.
+
+Help and Support
+----------------
+
+Documentation
+~~~~~~~~~~~~~
+
+- HTML documentation (stable release): https://scikit-learn.org
+- HTML documentation (development version): https://scikit-learn.org/dev/
+- FAQ: https://scikit-learn.org/stable/faq.html
+
+Communication
+~~~~~~~~~~~~~
+
+- Mailing list: https://mail.python.org/mailman/listinfo/scikit-learn
+- Gitter: https://gitter.im/scikit-learn/scikit-learn
+- Logos & Branding: https://github.com/scikit-learn/scikit-learn/tree/main/doc/logos
+- Blog: https://blog.scikit-learn.org
+- Calendar: https://blog.scikit-learn.org/calendar/
+- Twitter: https://twitter.com/scikit_learn
+- Stack Overflow: https://stackoverflow.com/questions/tagged/scikit-learn
+- Github Discussions: https://github.com/scikit-learn/scikit-learn/discussions
+- Website: https://scikit-learn.org
+- LinkedIn: https://www.linkedin.com/company/scikit-learn
+- YouTube: https://www.youtube.com/channel/UCJosFjYm0ZYVUARxuOZqnnw/playlists
+- Facebook: https://www.facebook.com/scikitlearnofficial/
+- Instagram: https://www.instagram.com/scikitlearnofficial/
+- TikTok: https://www.tiktok.com/@scikit.learn
+
+Citation
+~~~~~~~~
+
+If you use scikit-learn in a scientific publication, we would appreciate citations: https://scikit-learn.org/stable/about.html#citing-scikit-learn

llmeval-env/lib/python3.10/site-packages/scikit_learn-1.4.2.dist-info/WHEEL

@@ -0,0 +1,6 @@
+Wheel-Version: 1.0
+Generator: bdist_wheel (0.43.0)
+Root-Is-Purelib: false
+Tag: cp310-cp310-manylinux_2_17_x86_64
+Tag: cp310-cp310-manylinux2014_x86_64
+

llmeval-env/lib/python3.10/site-packages/scikit_learn-1.4.2.dist-info/top_level.txt

@@ -0,0 +1 @@
+sklearn

llmeval-env/lib/python3.10/site-packages/tokenizers/__init__.py

@@ -0,0 +1,100 @@
+from enum import Enum
+from typing import List, Tuple, Union
+
+
+Offsets = Tuple[int, int]
+
+TextInputSequence = str
+"""A :obj:`str` that represents an input sequence """
+
+PreTokenizedInputSequence = Union[List[str], Tuple[str]]
+"""A pre-tokenized input sequence. Can be one of:
+
+    - A :obj:`List` of :obj:`str`
+    - A :obj:`Tuple` of :obj:`str`
+"""
+
+TextEncodeInput = Union[
+    TextInputSequence,
+    Tuple[TextInputSequence, TextInputSequence],
+    List[TextInputSequence],
+]
+"""Represents a textual input for encoding. Can be either:
+
+    - A single sequence: :data:`~tokenizers.TextInputSequence`
+    - A pair of sequences:
+
+      - A :obj:`Tuple` of :data:`~tokenizers.TextInputSequence`
+      - Or a :obj:`List` of :data:`~tokenizers.TextInputSequence` of size 2
+"""
+
+PreTokenizedEncodeInput = Union[
+    PreTokenizedInputSequence,
+    Tuple[PreTokenizedInputSequence, PreTokenizedInputSequence],
+    List[PreTokenizedInputSequence],
+]
+"""Represents a pre-tokenized input for encoding. Can be either:
+
+    - A single sequence: :data:`~tokenizers.PreTokenizedInputSequence`
+    - A pair of sequences:
+
+      - A :obj:`Tuple` of :data:`~tokenizers.PreTokenizedInputSequence`
+      - Or a :obj:`List` of :data:`~tokenizers.PreTokenizedInputSequence` of size 2
+"""
+
+InputSequence = Union[TextInputSequence, PreTokenizedInputSequence]
+"""Represents all the possible types of input sequences for encoding. Can be:
+
+    - When ``is_pretokenized=False``: :data:`~TextInputSequence`
+    - When ``is_pretokenized=True``: :data:`~PreTokenizedInputSequence`
+"""
+
+EncodeInput = Union[TextEncodeInput, PreTokenizedEncodeInput]
+"""Represents all the possible types of input for encoding. Can be:
+
+    - When ``is_pretokenized=False``: :data:`~TextEncodeInput`
+    - When ``is_pretokenized=True``: :data:`~PreTokenizedEncodeInput`
+"""
+
+
+class OffsetReferential(Enum):
+    ORIGINAL = "original"
+    NORMALIZED = "normalized"
+
+
+class OffsetType(Enum):
+    BYTE = "byte"
+    CHAR = "char"
+
+
+class SplitDelimiterBehavior(Enum):
+    REMOVED = "removed"
+    ISOLATED = "isolated"
+    MERGED_WITH_PREVIOUS = "merged_with_previous"
+    MERGED_WITH_NEXT = "merged_with_next"
+    CONTIGUOUS = "contiguous"
+
+
+from .tokenizers import (
+    AddedToken,
+    Encoding,
+    NormalizedString,
+    PreTokenizedString,
+    Regex,
+    Token,
+    Tokenizer,
+    decoders,
+    models,
+    normalizers,
+    pre_tokenizers,
+    processors,
+    trainers,
+    __version__,
+)
+from .implementations import (
+    BertWordPieceTokenizer,
+    ByteLevelBPETokenizer,
+    CharBPETokenizer,
+    SentencePieceBPETokenizer,
+    SentencePieceUnigramTokenizer,
+)

llmeval-env/lib/python3.10/site-packages/tokenizers/__init__.pyi

@@ -0,0 +1,1200 @@
+# Generated content DO NOT EDIT
+class AddedToken:
+    """
+    Represents a token that can be be added to a :class:`~tokenizers.Tokenizer`.
+    It can have special options that defines the way it should behave.
+
+    Args:
+        content (:obj:`str`): The content of the token
+
+        single_word (:obj:`bool`, defaults to :obj:`False`):
+            Defines whether this token should only match single words. If :obj:`True`, this
+            token will never match inside of a word. For example the token ``ing`` would match
+            on ``tokenizing`` if this option is :obj:`False`, but not if it is :obj:`True`.
+            The notion of "`inside of a word`" is defined by the word boundaries pattern in
+            regular expressions (ie. the token should start and end with word boundaries).
+
+        lstrip (:obj:`bool`, defaults to :obj:`False`):
+            Defines whether this token should strip all potential whitespaces on its left side.
+            If :obj:`True`, this token will greedily match any whitespace on its left. For
+            example if we try to match the token ``[MASK]`` with ``lstrip=True``, in the text
+            ``"I saw a [MASK]"``, we would match on ``" [MASK]"``. (Note the space on the left).
+
+        rstrip (:obj:`bool`, defaults to :obj:`False`):
+            Defines whether this token should strip all potential whitespaces on its right
+            side. If :obj:`True`, this token will greedily match any whitespace on its right.
+            It works just like :obj:`lstrip` but on the right.
+
+        normalized (:obj:`bool`, defaults to :obj:`True` with :meth:`~tokenizers.Tokenizer.add_tokens` and :obj:`False` with :meth:`~tokenizers.Tokenizer.add_special_tokens`):
+            Defines whether this token should match against the normalized version of the input
+            text. For example, with the added token ``"yesterday"``, and a normalizer in charge of
+            lowercasing the text, the token could be extract from the input ``"I saw a lion
+            Yesterday"``.
+        special (:obj:`bool`, defaults to :obj:`False` with :meth:`~tokenizers.Tokenizer.add_tokens` and :obj:`False` with :meth:`~tokenizers.Tokenizer.add_special_tokens`):
+            Defines whether this token should be skipped when decoding.
+
+    """
+    def __init__(self, content, single_word=False, lstrip=False, rstrip=False, normalized=True, special=False):
+        pass
+
+    @property
+    def content(self):
+        """
+        Get the content of this :obj:`AddedToken`
+        """
+        pass
+
+    @property
+    def lstrip(self):
+        """
+        Get the value of the :obj:`lstrip` option
+        """
+        pass
+
+    @property
+    def normalized(self):
+        """
+        Get the value of the :obj:`normalized` option
+        """
+        pass
+
+    @property
+    def rstrip(self):
+        """
+        Get the value of the :obj:`rstrip` option
+        """
+        pass
+
+    @property
+    def single_word(self):
+        """
+        Get the value of the :obj:`single_word` option
+        """
+        pass
+
+    @property
+    def special(self):
+        """
+        Get the value of the :obj:`special` option
+        """
+        pass
+
+class Encoding:
+    """
+    The :class:`~tokenizers.Encoding` represents the output of a :class:`~tokenizers.Tokenizer`.
+    """
+    @property
+    def attention_mask(self):
+        """
+        The attention mask
+
+        This indicates to the LM which tokens should be attended to, and which should not.
+        This is especially important when batching sequences, where we need to applying
+        padding.
+
+        Returns:
+           :obj:`List[int]`: The attention mask
+        """
+        pass
+
+    def char_to_token(self, char_pos, sequence_index=0):
+        """
+        Get the token that contains the char at the given position in the input sequence.
+
+        Args:
+            char_pos (:obj:`int`):
+                The position of a char in the input string
+            sequence_index (:obj:`int`, defaults to :obj:`0`):
+                The index of the sequence that contains the target char
+
+        Returns:
+            :obj:`int`: The index of the token that contains this char in the encoded sequence
+        """
+        pass
+
+    def char_to_word(self, char_pos, sequence_index=0):
+        """
+        Get the word that contains the char at the given position in the input sequence.
+
+        Args:
+            char_pos (:obj:`int`):
+                The position of a char in the input string
+            sequence_index (:obj:`int`, defaults to :obj:`0`):
+                The index of the sequence that contains the target char
+
+        Returns:
+            :obj:`int`: The index of the word that contains this char in the input sequence
+        """
+        pass
+
+    @property
+    def ids(self):
+        """
+        The generated IDs
+
+        The IDs are the main input to a Language Model. They are the token indices,
+        the numerical representations that a LM understands.
+
+        Returns:
+            :obj:`List[int]`: The list of IDs
+        """
+        pass
+
+    @staticmethod
+    def merge(encodings, growing_offsets=True):
+        """
+        Merge the list of encodings into one final :class:`~tokenizers.Encoding`
+
+        Args:
+            encodings (A :obj:`List` of :class:`~tokenizers.Encoding`):
+                The list of encodings that should be merged in one
+
+            growing_offsets (:obj:`bool`, defaults to :obj:`True`):
+                Whether the offsets should accumulate while merging
+
+        Returns:
+            :class:`~tokenizers.Encoding`: The resulting Encoding
+        """
+        pass
+
+    @property
+    def n_sequences(self):
+        """
+        The number of sequences represented
+
+        Returns:
+            :obj:`int`: The number of sequences in this :class:`~tokenizers.Encoding`
+        """
+        pass
+
+    @property
+    def offsets(self):
+        """
+        The offsets associated to each token
+
+        These offsets let's you slice the input string, and thus retrieve the original
+        part that led to producing the corresponding token.
+
+        Returns:
+            A :obj:`List` of :obj:`Tuple[int, int]`: The list of offsets
+        """
+        pass
+
+    @property
+    def overflowing(self):
+        """
+        A :obj:`List` of overflowing :class:`~tokenizers.Encoding`
+
+        When using truncation, the :class:`~tokenizers.Tokenizer` takes care of splitting
+        the output into as many pieces as required to match the specified maximum length.
+        This field lets you retrieve all the subsequent pieces.
+
+        When you use pairs of sequences, the overflowing pieces will contain enough
+        variations to cover all the possible combinations, while respecting the provided
+        maximum length.
+        """
+        pass
+
+    def pad(self, length, direction="right", pad_id=0, pad_type_id=0, pad_token="[PAD]"):
+        """
+        Pad the :class:`~tokenizers.Encoding` at the given length
+
+        Args:
+            length (:obj:`int`):
+                The desired length
+
+            direction: (:obj:`str`, defaults to :obj:`right`):
+                The expected padding direction. Can be either :obj:`right` or :obj:`left`
+
+            pad_id (:obj:`int`, defaults to :obj:`0`):
+                The ID corresponding to the padding token
+
+            pad_type_id (:obj:`int`, defaults to :obj:`0`):
+                The type ID corresponding to the padding token
+
+            pad_token (:obj:`str`, defaults to `[PAD]`):
+                The pad token to use
+        """
+        pass
+
+    @property
+    def sequence_ids(self):
+        """
+        The generated sequence indices.
+
+        They represent the index of the input sequence associated to each token.
+        The sequence id can be None if the token is not related to any input sequence,
+        like for example with special tokens.
+
+        Returns:
+            A :obj:`List` of :obj:`Optional[int]`: A list of optional sequence index.
+        """
+        pass
+
+    def set_sequence_id(self, sequence_id):
+        """
+        Set the given sequence index
+
+        Set the given sequence index for the whole range of tokens contained in this
+        :class:`~tokenizers.Encoding`.
+        """
+        pass
+
+    @property
+    def special_tokens_mask(self):
+        """
+        The special token mask
+
+        This indicates which tokens are special tokens, and which are not.
+
+        Returns:
+            :obj:`List[int]`: The special tokens mask
+        """
+        pass
+
+    def token_to_chars(self, token_index):
+        """
+        Get the offsets of the token at the given index.
+
+        The returned offsets are related to the input sequence that contains the
+        token.  In order to determine in which input sequence it belongs, you
+        must call :meth:`~tokenizers.Encoding.token_to_sequence()`.
+
+        Args:
+            token_index (:obj:`int`):
+                The index of a token in the encoded sequence.
+
+        Returns:
+            :obj:`Tuple[int, int]`: The token offsets :obj:`(first, last + 1)`
+        """
+        pass
+
+    def token_to_sequence(self, token_index):
+        """
+        Get the index of the sequence represented by the given token.
+
+        In the general use case, this method returns :obj:`0` for a single sequence or
+        the first sequence of a pair, and :obj:`1` for the second sequence of a pair
+
+        Args:
+            token_index (:obj:`int`):
+                The index of a token in the encoded sequence.
+
+        Returns:
+            :obj:`int`: The sequence id of the given token
+        """
+        pass
+
+    def token_to_word(self, token_index):
+        """
+        Get the index of the word that contains the token in one of the input sequences.
+
+        The returned word index is related to the input sequence that contains
+        the token.  In order to determine in which input sequence it belongs, you
+        must call :meth:`~tokenizers.Encoding.token_to_sequence()`.
+
+        Args:
+            token_index (:obj:`int`):
+                The index of a token in the encoded sequence.
+
+        Returns:
+            :obj:`int`: The index of the word in the relevant input sequence.
+        """
+        pass
+
+    @property
+    def tokens(self):
+        """
+        The generated tokens
+
+        They are the string representation of the IDs.
+
+        Returns:
+            :obj:`List[str]`: The list of tokens
+        """
+        pass
+
+    def truncate(self, max_length, stride=0, direction="right"):
+        """
+        Truncate the :class:`~tokenizers.Encoding` at the given length
+
+        If this :class:`~tokenizers.Encoding` represents multiple sequences, when truncating
+        this information is lost. It will be considered as representing a single sequence.
+
+        Args:
+            max_length (:obj:`int`):
+                The desired length
+
+            stride (:obj:`int`, defaults to :obj:`0`):
+                The length of previous content to be included in each overflowing piece
+
+            direction (:obj:`str`, defaults to :obj:`right`):
+                Truncate direction
+        """
+        pass
+
+    @property
+    def type_ids(self):
+        """
+        The generated type IDs
+
+        Generally used for tasks like sequence classification or question answering,
+        these tokens let the LM know which input sequence corresponds to each tokens.
+
+        Returns:
+            :obj:`List[int]`: The list of type ids
+        """
+        pass
+
+    @property
+    def word_ids(self):
+        """
+        The generated word indices.
+
+        They represent the index of the word associated to each token.
+        When the input is pre-tokenized, they correspond to the ID of the given input label,
+        otherwise they correspond to the words indices as defined by the
+        :class:`~tokenizers.pre_tokenizers.PreTokenizer` that was used.
+
+        For special tokens and such (any token that was generated from something that was
+        not part of the input), the output is :obj:`None`
+
+        Returns:
+            A :obj:`List` of :obj:`Optional[int]`: A list of optional word index.
+        """
+        pass
+
+    def word_to_chars(self, word_index, sequence_index=0):
+        """
+        Get the offsets of the word at the given index in one of the input sequences.
+
+        Args:
+            word_index (:obj:`int`):
+                The index of a word in one of the input sequences.
+            sequence_index (:obj:`int`, defaults to :obj:`0`):
+                The index of the sequence that contains the target word
+
+        Returns:
+            :obj:`Tuple[int, int]`: The range of characters (span) :obj:`(first, last + 1)`
+        """
+        pass
+
+    def word_to_tokens(self, word_index, sequence_index=0):
+        """
+        Get the encoded tokens corresponding to the word at the given index
+        in one of the input sequences.
+
+        Args:
+            word_index (:obj:`int`):
+                The index of a word in one of the input sequences.
+            sequence_index (:obj:`int`, defaults to :obj:`0`):
+                The index of the sequence that contains the target word
+
+        Returns:
+            :obj:`Tuple[int, int]`: The range of tokens: :obj:`(first, last + 1)`
+        """
+        pass
+
+    @property
+    def words(self):
+        """
+        The generated word indices.
+
+        .. warning::
+            This is deprecated and will be removed in a future version.
+            Please use :obj:`~tokenizers.Encoding.word_ids` instead.
+
+        They represent the index of the word associated to each token.
+        When the input is pre-tokenized, they correspond to the ID of the given input label,
+        otherwise they correspond to the words indices as defined by the
+        :class:`~tokenizers.pre_tokenizers.PreTokenizer` that was used.
+
+        For special tokens and such (any token that was generated from something that was
+        not part of the input), the output is :obj:`None`
+
+        Returns:
+            A :obj:`List` of :obj:`Optional[int]`: A list of optional word index.
+        """
+        pass
+
+class NormalizedString:
+    """
+    NormalizedString
+
+    A NormalizedString takes care of modifying an "original" string, to obtain a "normalized" one.
+    While making all the requested modifications, it keeps track of the alignment information
+    between the two versions of the string.
+
+    Args:
+        sequence: str:
+            The string sequence used to initialize this NormalizedString
+    """
+    def append(self, s):
+        """
+        Append the given sequence to the string
+        """
+        pass
+
+    def clear(self):
+        """
+        Clears the string
+        """
+        pass
+
+    def filter(self, func):
+        """
+        Filter each character of the string using the given func
+        """
+        pass
+
+    def for_each(self, func):
+        """
+        Calls the given function for each character of the string
+        """
+        pass
+
+    def lowercase(self):
+        """
+        Lowercase the string
+        """
+        pass
+
+    def lstrip(self):
+        """
+        Strip the left of the string
+        """
+        pass
+
+    def map(self, func):
+        """
+        Calls the given function for each character of the string
+
+        Replaces each character of the string using the returned value. Each
+        returned value **must** be a str of length 1 (ie a character).
+        """
+        pass
+
+    def nfc(self):
+        """
+        Runs the NFC normalization
+        """
+        pass
+
+    def nfd(self):
+        """
+        Runs the NFD normalization
+        """
+        pass
+
+    def nfkc(self):
+        """
+        Runs the NFKC normalization
+        """
+        pass
+
+    def nfkd(self):
+        """
+        Runs the NFKD normalization
+        """
+        pass
+
+    @property
+    def normalized(self):
+        """
+        The normalized part of the string
+        """
+        pass
+
+    def prepend(self, s):
+        """
+        Prepend the given sequence to the string
+        """
+        pass
+
+    def replace(self, pattern, content):
+        """
+        Replace the content of the given pattern with the provided content
+
+        Args:
+            pattern: Pattern:
+                A pattern used to match the string. Usually a string or a Regex
+
+            content: str:
+                The content to be used as replacement
+        """
+        pass
+
+    def rstrip(self):
+        """
+        Strip the right of the string
+        """
+        pass
+
+    def slice(self, range):
+        """
+        Slice the string using the given range
+        """
+        pass
+
+    def split(self, pattern, behavior):
+        """
+        Split the NormalizedString using the given pattern and the specified behavior
+
+        Args:
+            pattern: Pattern:
+                A pattern used to split the string. Usually a string or a regex built with `tokenizers.Regex`
+
+            behavior: SplitDelimiterBehavior:
+                The behavior to use when splitting.
+                Choices: "removed", "isolated", "merged_with_previous", "merged_with_next",
+                "contiguous"
+
+        Returns:
+            A list of NormalizedString, representing each split
+        """
+        pass
+
+    def strip(self):
+        """
+        Strip both ends of the string
+        """
+        pass
+
+    def uppercase(self):
+        """
+        Uppercase the string
+        """
+        pass
+
+class PreTokenizedString:
+    """
+    PreTokenizedString
+
+    Wrapper over a string, that provides a way to normalize, pre-tokenize, tokenize the
+    underlying string, while keeping track of the alignment information (offsets).
+
+    The PreTokenizedString manages what we call `splits`. Each split represents a substring
+    which is a subpart of the original string, with the relevant offsets and tokens.
+
+    When calling one of the methods used to modify the PreTokenizedString (namely one of
+    `split`, `normalize` or `tokenize), only the `splits` that don't have any associated
+    tokens will get modified.
+
+    Args:
+        sequence: str:
+            The string sequence used to initialize this PreTokenizedString
+    """
+    def __init__(self, sequence):
+        pass
+
+    def get_splits(self, offset_referential="original", offset_type="char"):
+        """
+        Get the splits currently managed by the PreTokenizedString
+
+        Args:
+            offset_referential: :obj:`str`
+                Whether the returned splits should have offsets expressed relative
+                to the original string, or the normalized one. choices: "original", "normalized".
+
+            offset_type: :obj:`str`
+                Whether the returned splits should have offsets expressed in bytes or chars.
+                When slicing an str, we usually want to use chars, which is the default value.
+                Now in some cases it might be interesting to get these offsets expressed in bytes,
+                so it is possible to change this here.
+                choices: "char", "bytes"
+
+        Returns
+            A list of splits
+        """
+        pass
+
+    def normalize(self, func):
+        """
+        Normalize each split of the `PreTokenizedString` using the given `func`
+
+        Args:
+            func: Callable[[NormalizedString], None]:
+                The function used to normalize each underlying split. This function
+                does not need to return anything, just calling the methods on the provided
+                NormalizedString allow its modification.
+        """
+        pass
+
+    def split(self, func):
+        """
+        Split the PreTokenizedString using the given `func`
+
+        Args:
+            func: Callable[[index, NormalizedString], List[NormalizedString]]:
+                The function used to split each underlying split.
+                It is expected to return a list of `NormalizedString`, that represent the new
+                splits. If the given `NormalizedString` does not need any splitting, we can
+                just return it directly.
+                In order for the offsets to be tracked accurately, any returned `NormalizedString`
+                should come from calling either `.split` or `.slice` on the received one.
+        """
+        pass
+
+    def to_encoding(self, type_id=0, word_idx=None):
+        """
+        Return an Encoding generated from this PreTokenizedString
+
+        Args:
+            type_id: int = 0:
+                The type_id to be used on the generated Encoding.
+
+            word_idx: Optional[int] = None:
+                An optional word index to be used for each token of this Encoding. If provided,
+                all the word indices in the generated Encoding will use this value, instead
+                of the one automatically tracked during pre-tokenization.
+
+        Returns:
+            An Encoding
+        """
+        pass
+
+    def tokenize(self, func):
+        """
+        Tokenize each split of the `PreTokenizedString` using the given `func`
+
+        Args:
+            func: Callable[[str], List[Token]]:
+                The function used to tokenize each underlying split. This function must return
+                a list of Token generated from the input str.
+        """
+        pass
+
+class Regex:
+    """
+    Instantiate a new Regex with the given pattern
+    """
+    def __init__(self, pattern):
+        pass
+
+class Token:
+    pass
+
+class Tokenizer:
+    """
+    A :obj:`Tokenizer` works as a pipeline. It processes some raw text as input
+    and outputs an :class:`~tokenizers.Encoding`.
+
+    Args:
+        model (:class:`~tokenizers.models.Model`):
+            The core algorithm that this :obj:`Tokenizer` should be using.
+
+    """
+    def __init__(self, model):
+        pass
+
+    def add_special_tokens(self, tokens):
+        """
+        Add the given special tokens to the Tokenizer.
+
+        If these tokens are already part of the vocabulary, it just let the Tokenizer know about
+        them. If they don't exist, the Tokenizer creates them, giving them a new id.
+
+        These special tokens will never be processed by the model (ie won't be split into
+        multiple tokens), and they can be removed from the output when decoding.
+
+        Args:
+            tokens (A :obj:`List` of :class:`~tokenizers.AddedToken` or :obj:`str`):
+                The list of special tokens we want to add to the vocabulary. Each token can either
+                be a string or an instance of :class:`~tokenizers.AddedToken` for more
+                customization.
+
+        Returns:
+            :obj:`int`: The number of tokens that were created in the vocabulary
+        """
+        pass
+
+    def add_tokens(self, tokens):
+        """
+        Add the given tokens to the vocabulary
+
+        The given tokens are added only if they don't already exist in the vocabulary.
+        Each token then gets a new attributed id.
+
+        Args:
+            tokens (A :obj:`List` of :class:`~tokenizers.AddedToken` or :obj:`str`):
+                The list of tokens we want to add to the vocabulary. Each token can be either a
+                string or an instance of :class:`~tokenizers.AddedToken` for more customization.
+
+        Returns:
+            :obj:`int`: The number of tokens that were created in the vocabulary
+        """
+        pass
+
+    def decode(self, ids, skip_special_tokens=True):
+        """
+        Decode the given list of ids back to a string
+
+        This is used to decode anything coming back from a Language Model
+
+        Args:
+            ids (A :obj:`List/Tuple` of :obj:`int`):
+                The list of ids that we want to decode
+
+            skip_special_tokens (:obj:`bool`, defaults to :obj:`True`):
+                Whether the special tokens should be removed from the decoded string
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+    def decode_batch(self, sequences, skip_special_tokens=True):
+        """
+        Decode a batch of ids back to their corresponding string
+
+        Args:
+            sequences (:obj:`List` of :obj:`List[int]`):
+                The batch of sequences we want to decode
+
+            skip_special_tokens (:obj:`bool`, defaults to :obj:`True`):
+                Whether the special tokens should be removed from the decoded strings
+
+        Returns:
+            :obj:`List[str]`: A list of decoded strings
+        """
+        pass
+
+    @property
+    def decoder(self):
+        """
+        The `optional` :class:`~tokenizers.decoders.Decoder` in use by the Tokenizer
+        """
+        pass
+
+    def enable_padding(
+        self, direction="right", pad_id=0, pad_type_id=0, pad_token="[PAD]", length=None, pad_to_multiple_of=None
+    ):
+        """
+        Enable the padding
+
+        Args:
+            direction (:obj:`str`, `optional`, defaults to :obj:`right`):
+                The direction in which to pad. Can be either ``right`` or ``left``
+
+            pad_to_multiple_of (:obj:`int`, `optional`):
+                If specified, the padding length should always snap to the next multiple of the
+                given value. For example if we were going to pad witha length of 250 but
+                ``pad_to_multiple_of=8`` then we will pad to 256.
+
+            pad_id (:obj:`int`, defaults to 0):
+                The id to be used when padding
+
+            pad_type_id (:obj:`int`, defaults to 0):
+                The type id to be used when padding
+
+            pad_token (:obj:`str`, defaults to :obj:`[PAD]`):
+                The pad token to be used when padding
+
+            length (:obj:`int`, `optional`):
+                If specified, the length at which to pad. If not specified we pad using the size of
+                the longest sequence in a batch.
+        """
+        pass
+
+    def enable_truncation(self, max_length, stride=0, strategy="longest_first", direction="right"):
+        """
+        Enable truncation
+
+        Args:
+            max_length (:obj:`int`):
+                The max length at which to truncate
+
+            stride (:obj:`int`, `optional`):
+                The length of the previous first sequence to be included in the overflowing
+                sequence
+
+            strategy (:obj:`str`, `optional`, defaults to :obj:`longest_first`):
+                The strategy used to truncation. Can be one of ``longest_first``, ``only_first`` or
+                ``only_second``.
+
+            direction (:obj:`str`, defaults to :obj:`right`):
+                Truncate direction
+        """
+        pass
+
+    def encode(self, sequence, pair=None, is_pretokenized=False, add_special_tokens=True):
+        """
+        Encode the given sequence and pair. This method can process raw text sequences
+        as well as already pre-tokenized sequences.
+
+        Example:
+            Here are some examples of the inputs that are accepted::
+
+                encode("A single sequence")`
+                encode("A sequence", "And its pair")`
+                encode([ "A", "pre", "tokenized", "sequence" ], is_pretokenized=True)`
+                encode(
+                    [ "A", "pre", "tokenized", "sequence" ], [ "And", "its", "pair" ],
+                    is_pretokenized=True
+                )
+
+        Args:
+            sequence (:obj:`~tokenizers.InputSequence`):
+                The main input sequence we want to encode. This sequence can be either raw
+                text or pre-tokenized, according to the ``is_pretokenized`` argument:
+
+                - If ``is_pretokenized=False``: :class:`~tokenizers.TextInputSequence`
+                - If ``is_pretokenized=True``: :class:`~tokenizers.PreTokenizedInputSequence`
+
+            pair (:obj:`~tokenizers.InputSequence`, `optional`):
+                An optional input sequence. The expected format is the same that for ``sequence``.
+
+            is_pretokenized (:obj:`bool`, defaults to :obj:`False`):
+                Whether the input is already pre-tokenized
+
+            add_special_tokens (:obj:`bool`, defaults to :obj:`True`):
+                Whether to add the special tokens
+
+        Returns:
+            :class:`~tokenizers.Encoding`: The encoded result
+
+        """
+        pass
+
+    def encode_batch(self, input, is_pretokenized=False, add_special_tokens=True):
+        """
+        Encode the given batch of inputs. This method accept both raw text sequences
+        as well as already pre-tokenized sequences.
+
+        Example:
+            Here are some examples of the inputs that are accepted::
+
+                encode_batch([
+                    "A single sequence",
+                    ("A tuple with a sequence", "And its pair"),
+                    [ "A", "pre", "tokenized", "sequence" ],
+                    ([ "A", "pre", "tokenized", "sequence" ], "And its pair")
+                ])
+
+        Args:
+            input (A :obj:`List`/:obj:`Tuple` of :obj:`~tokenizers.EncodeInput`):
+                A list of single sequences or pair sequences to encode. Each sequence
+                can be either raw text or pre-tokenized, according to the ``is_pretokenized``
+                argument:
+
+                - If ``is_pretokenized=False``: :class:`~tokenizers.TextEncodeInput`
+                - If ``is_pretokenized=True``: :class:`~tokenizers.PreTokenizedEncodeInput`
+
+            is_pretokenized (:obj:`bool`, defaults to :obj:`False`):
+                Whether the input is already pre-tokenized
+
+            add_special_tokens (:obj:`bool`, defaults to :obj:`True`):
+                Whether to add the special tokens
+
+        Returns:
+            A :obj:`List` of :class:`~tokenizers.Encoding`: The encoded batch
+
+        """
+        pass
+
+    @property
+    def encode_special_tokens(self):
+        """
+        Modifies the tokenizer in order to use or not the special tokens
+        during encoding.
+
+        Args:
+            value (:obj:`bool`):
+                Whether to use the special tokens or not
+
+        """
+        pass
+
+    @staticmethod
+    def from_buffer(buffer):
+        """
+        Instantiate a new :class:`~tokenizers.Tokenizer` from the given buffer.
+
+        Args:
+            buffer (:obj:`bytes`):
+                A buffer containing a previously serialized :class:`~tokenizers.Tokenizer`
+
+        Returns:
+            :class:`~tokenizers.Tokenizer`: The new tokenizer
+        """
+        pass
+
+    @staticmethod
+    def from_file(path):
+        """
+        Instantiate a new :class:`~tokenizers.Tokenizer` from the file at the given path.
+
+        Args:
+            path (:obj:`str`):
+                A path to a local JSON file representing a previously serialized
+                :class:`~tokenizers.Tokenizer`
+
+        Returns:
+            :class:`~tokenizers.Tokenizer`: The new tokenizer
+        """
+        pass
+
+    @staticmethod
+    def from_pretrained(identifier, revision="main", auth_token=None):
+        """
+        Instantiate a new :class:`~tokenizers.Tokenizer` from an existing file on the
+        Hugging Face Hub.
+
+        Args:
+            identifier (:obj:`str`):
+                The identifier of a Model on the Hugging Face Hub, that contains
+                a tokenizer.json file
+            revision (:obj:`str`, defaults to `main`):
+                A branch or commit id
+            auth_token (:obj:`str`, `optional`, defaults to `None`):
+                An optional auth token used to access private repositories on the
+                Hugging Face Hub
+
+        Returns:
+            :class:`~tokenizers.Tokenizer`: The new tokenizer
+        """
+        pass
+
+    @staticmethod
+    def from_str(json):
+        """
+        Instantiate a new :class:`~tokenizers.Tokenizer` from the given JSON string.
+
+        Args:
+            json (:obj:`str`):
+                A valid JSON string representing a previously serialized
+                :class:`~tokenizers.Tokenizer`
+
+        Returns:
+            :class:`~tokenizers.Tokenizer`: The new tokenizer
+        """
+        pass
+
+    def get_added_tokens_decoder(self):
+        """
+        Get the underlying vocabulary
+
+        Returns:
+            :obj:`Dict[int, AddedToken]`: The vocabulary
+        """
+        pass
+
+    def get_vocab(self, with_added_tokens=True):
+        """
+        Get the underlying vocabulary
+
+        Args:
+            with_added_tokens (:obj:`bool`, defaults to :obj:`True`):
+                Whether to include the added tokens
+
+        Returns:
+            :obj:`Dict[str, int]`: The vocabulary
+        """
+        pass
+
+    def get_vocab_size(self, with_added_tokens=True):
+        """
+        Get the size of the underlying vocabulary
+
+        Args:
+            with_added_tokens (:obj:`bool`, defaults to :obj:`True`):
+                Whether to include the added tokens
+
+        Returns:
+            :obj:`int`: The size of the vocabulary
+        """
+        pass
+
+    def id_to_token(self, id):
+        """
+        Convert the given id to its corresponding token if it exists
+
+        Args:
+            id (:obj:`int`):
+                The id to convert
+
+        Returns:
+            :obj:`Optional[str]`: An optional token, :obj:`None` if out of vocabulary
+        """
+        pass
+
+    @property
+    def model(self):
+        """
+        The :class:`~tokenizers.models.Model` in use by the Tokenizer
+        """
+        pass
+
+    def no_padding(self):
+        """
+        Disable padding
+        """
+        pass
+
+    def no_truncation(self):
+        """
+        Disable truncation
+        """
+        pass
+
+    @property
+    def normalizer(self):
+        """
+        The `optional` :class:`~tokenizers.normalizers.Normalizer` in use by the Tokenizer
+        """
+        pass
+
+    def num_special_tokens_to_add(self, is_pair):
+        """
+        Return the number of special tokens that would be added for single/pair sentences.
+        :param is_pair: Boolean indicating if the input would be a single sentence or a pair
+        :return:
+        """
+        pass
+
+    @property
+    def padding(self):
+        """
+        Get the current padding parameters
+
+        `Cannot be set, use` :meth:`~tokenizers.Tokenizer.enable_padding` `instead`
+
+        Returns:
+            (:obj:`dict`, `optional`):
+                A dict with the current padding parameters if padding is enabled
+        """
+        pass
+
+    def post_process(self, encoding, pair=None, add_special_tokens=True):
+        """
+        Apply all the post-processing steps to the given encodings.
+
+        The various steps are:
+
+            1. Truncate according to the set truncation params (provided with
+               :meth:`~tokenizers.Tokenizer.enable_truncation`)
+            2. Apply the :class:`~tokenizers.processors.PostProcessor`
+            3. Pad according to the set padding params (provided with
+               :meth:`~tokenizers.Tokenizer.enable_padding`)
+
+        Args:
+            encoding (:class:`~tokenizers.Encoding`):
+                The :class:`~tokenizers.Encoding` corresponding to the main sequence.
+
+            pair (:class:`~tokenizers.Encoding`, `optional`):
+                An optional :class:`~tokenizers.Encoding` corresponding to the pair sequence.
+
+            add_special_tokens (:obj:`bool`):
+                Whether to add the special tokens
+
+        Returns:
+            :class:`~tokenizers.Encoding`: The final post-processed encoding
+        """
+        pass
+
+    @property
+    def post_processor(self):
+        """
+        The `optional` :class:`~tokenizers.processors.PostProcessor` in use by the Tokenizer
+        """
+        pass
+
+    @property
+    def pre_tokenizer(self):
+        """
+        The `optional` :class:`~tokenizers.pre_tokenizers.PreTokenizer` in use by the Tokenizer
+        """
+        pass
+
+    def save(self, path, pretty=True):
+        """
+        Save the :class:`~tokenizers.Tokenizer` to the file at the given path.
+
+        Args:
+            path (:obj:`str`):
+                A path to a file in which to save the serialized tokenizer.
+
+            pretty (:obj:`bool`, defaults to :obj:`True`):
+                Whether the JSON file should be pretty formatted.
+        """
+        pass
+
+    def to_str(self, pretty=False):
+        """
+        Gets a serialized string representing this :class:`~tokenizers.Tokenizer`.
+
+        Args:
+            pretty (:obj:`bool`, defaults to :obj:`False`):
+                Whether the JSON string should be pretty formatted.
+
+        Returns:
+            :obj:`str`: A string representing the serialized Tokenizer
+        """
+        pass
+
+    def token_to_id(self, token):
+        """
+        Convert the given token to its corresponding id if it exists
+
+        Args:
+            token (:obj:`str`):
+                The token to convert
+
+        Returns:
+            :obj:`Optional[int]`: An optional id, :obj:`None` if out of vocabulary
+        """
+        pass
+
+    def train(self, files, trainer=None):
+        """
+        Train the Tokenizer using the given files.
+
+        Reads the files line by line, while keeping all the whitespace, even new lines.
+        If you want to train from data store in-memory, you can check
+        :meth:`~tokenizers.Tokenizer.train_from_iterator`
+
+        Args:
+            files (:obj:`List[str]`):
+                A list of path to the files that we should use for training
+
+            trainer (:obj:`~tokenizers.trainers.Trainer`, `optional`):
+                An optional trainer that should be used to train our Model
+        """
+        pass
+
+    def train_from_iterator(self, iterator, trainer=None, length=None):
+        """
+        Train the Tokenizer using the provided iterator.
+
+        You can provide anything that is a Python Iterator
+
+            * A list of sequences :obj:`List[str]`
+            * A generator that yields :obj:`str` or :obj:`List[str]`
+            * A Numpy array of strings
+            * ...
+
+        Args:
+            iterator (:obj:`Iterator`):
+                Any iterator over strings or list of strings
+
+            trainer (:obj:`~tokenizers.trainers.Trainer`, `optional`):
+                An optional trainer that should be used to train our Model
+
+            length (:obj:`int`, `optional`):
+                The total number of sequences in the iterator. This is used to
+                provide meaningful progress tracking
+        """
+        pass
+
+    @property
+    def truncation(self):
+        """
+        Get the currently set truncation parameters
+
+        `Cannot set, use` :meth:`~tokenizers.Tokenizer.enable_truncation` `instead`
+
+        Returns:
+            (:obj:`dict`, `optional`):
+                A dict with the current truncation parameters if truncation is enabled
+        """
+        pass

llmeval-env/lib/python3.10/site-packages/tokenizers/decoders/__init__.py

@@ -0,0 +1,14 @@
+from .. import decoders
+
+
+Decoder = decoders.Decoder
+ByteLevel = decoders.ByteLevel
+Replace = decoders.Replace
+WordPiece = decoders.WordPiece
+ByteFallback = decoders.ByteFallback
+Fuse = decoders.Fuse
+Strip = decoders.Strip
+Metaspace = decoders.Metaspace
+BPEDecoder = decoders.BPEDecoder
+CTC = decoders.CTC
+Sequence = decoders.Sequence

llmeval-env/lib/python3.10/site-packages/tokenizers/decoders/__init__.pyi

@@ -0,0 +1,271 @@
+# Generated content DO NOT EDIT
+class Decoder:
+    """
+    Base class for all decoders
+
+    This class is not supposed to be instantiated directly. Instead, any implementation of
+    a Decoder will return an instance of this class when instantiated.
+    """
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class BPEDecoder(Decoder):
+    """
+    BPEDecoder Decoder
+
+    Args:
+        suffix (:obj:`str`, `optional`, defaults to :obj:`</w>`):
+            The suffix that was used to caracterize an end-of-word. This suffix will
+            be replaced by whitespaces during the decoding
+    """
+    def __init__(self, suffix="</w>"):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class ByteFallback(Decoder):
+    """
+    ByteFallback Decoder
+    ByteFallback is a simple trick which converts tokens looking like `<0x61>`
+    to pure bytes, and attempts to make them into a string. If the tokens
+    cannot be decoded you will get � instead for each inconvertable byte token
+
+    """
+    def __init__(self):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class ByteLevel(Decoder):
+    """
+    ByteLevel Decoder
+
+    This decoder is to be used in tandem with the :class:`~tokenizers.pre_tokenizers.ByteLevel`
+    :class:`~tokenizers.pre_tokenizers.PreTokenizer`.
+    """
+    def __init__(self):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class CTC(Decoder):
+    """
+    CTC Decoder
+
+    Args:
+        pad_token (:obj:`str`, `optional`, defaults to :obj:`<pad>`):
+            The pad token used by CTC to delimit a new token.
+        word_delimiter_token (:obj:`str`, `optional`, defaults to :obj:`|`):
+            The word delimiter token. It will be replaced by a <space>
+        cleanup (:obj:`bool`, `optional`, defaults to :obj:`True`):
+            Whether to cleanup some tokenization artifacts.
+            Mainly spaces before punctuation, and some abbreviated english forms.
+    """
+    def __init__(self, pad_token="<pad>", word_delimiter_token="|", cleanup=True):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class Fuse(Decoder):
+    """
+    Fuse Decoder
+    Fuse simply fuses every token into a single string.
+    This is the last step of decoding, this decoder exists only if
+    there is need to add other decoders *after* the fusion
+    """
+    def __init__(self):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class Metaspace(Decoder):
+    """
+    Metaspace Decoder
+
+    Args:
+        replacement (:obj:`str`, `optional`, defaults to :obj:`▁`):
+            The replacement character. Must be exactly one character. By default we
+            use the `▁` (U+2581) meta symbol (Same as in SentencePiece).
+
+        prepend_scheme (:obj:`str`, `optional`, defaults to :obj:`"always"`):
+            Whether to add a space to the first word if there isn't already one. This
+            lets us treat `hello` exactly like `say hello`.
+            Choices: "always", "never", "first". First means the space is only added on the first
+            token (relevant when special tokens are used or other pre_tokenizer are used).
+    """
+    def __init__(self, replacement="▁", prepend_scheme="always", split=True):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class Replace(Decoder):
+    """
+    Replace Decoder
+
+    This decoder is to be used in tandem with the :class:`~tokenizers.pre_tokenizers.Replace`
+    :class:`~tokenizers.pre_tokenizers.PreTokenizer`.
+    """
+    def __init__(self, pattern, content):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class Sequence(Decoder):
+    """
+    Sequence Decoder
+
+    Args:
+        decoders (:obj:`List[Decoder]`)
+            The decoders that need to be chained
+    """
+    def __init__(self, decoders):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class Strip(Decoder):
+    """
+    Strip normalizer
+    Strips n left characters of each token, or n right characters of each token
+    """
+    def __init__(self, content, left=0, right=0):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass
+
+class WordPiece(Decoder):
+    """
+    WordPiece Decoder
+
+    Args:
+        prefix (:obj:`str`, `optional`, defaults to :obj:`##`):
+            The prefix to use for subwords that are not a beginning-of-word
+
+        cleanup (:obj:`bool`, `optional`, defaults to :obj:`True`):
+            Whether to cleanup some tokenization artifacts. Mainly spaces before punctuation,
+            and some abbreviated english forms.
+    """
+    def __init__(self, prefix="##", cleanup=True):
+        pass
+
+    def decode(self, tokens):
+        """
+        Decode the given list of tokens to a final string
+
+        Args:
+            tokens (:obj:`List[str]`):
+                The list of tokens to decode
+
+        Returns:
+            :obj:`str`: The decoded string
+        """
+        pass

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/__init__.py

@@ -0,0 +1,6 @@
+from .base_tokenizer import BaseTokenizer
+from .bert_wordpiece import BertWordPieceTokenizer
+from .byte_level_bpe import ByteLevelBPETokenizer
+from .char_level_bpe import CharBPETokenizer
+from .sentencepiece_bpe import SentencePieceBPETokenizer
+from .sentencepiece_unigram import SentencePieceUnigramTokenizer

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/base_tokenizer.py

@@ -0,0 +1,418 @@
+from typing import Dict, List, Optional, Tuple, Union
+
+from tokenizers import AddedToken, EncodeInput, Encoding, InputSequence, Tokenizer
+from tokenizers.decoders import Decoder
+from tokenizers.models import Model
+from tokenizers.normalizers import Normalizer
+from tokenizers.pre_tokenizers import PreTokenizer
+from tokenizers.processors import PostProcessor
+
+
+Offsets = Tuple[int, int]
+
+
+class BaseTokenizer:
+    def __init__(self, tokenizer: Tokenizer, parameters=None):
+        self._tokenizer = tokenizer
+        self._parameters = parameters if parameters is not None else {}
+
+    def __repr__(self):
+        return "Tokenizer(vocabulary_size={}, {})".format(
+            self._tokenizer.get_vocab_size(),
+            ", ".join(k + "=" + str(v) for k, v in self._parameters.items()),
+        )
+
+    def num_special_tokens_to_add(self, is_pair: bool) -> int:
+        """
+        Return the number of special tokens that would be added for single/pair sentences.
+        :param is_pair: Boolean indicating if the input would be a single sentence or a pair
+        :return:
+        """
+        return self._tokenizer.num_special_tokens_to_add(is_pair)
+
+    def get_vocab(self, with_added_tokens: bool = True) -> Dict[str, int]:
+        """Returns the vocabulary
+
+        Args:
+            with_added_tokens: boolean:
+                Whether to include the added tokens in the vocabulary
+
+        Returns:
+            The vocabulary
+        """
+        return self._tokenizer.get_vocab(with_added_tokens=with_added_tokens)
+
+    def get_added_tokens_decoder(self) -> Dict[int, AddedToken]:
+        """Returns the added reverse vocabulary
+
+        Returns:
+            The added vocabulary mapping ints to AddedTokens
+        """
+        return self._tokenizer.get_added_tokens_decoder()
+
+    def get_vocab_size(self, with_added_tokens: bool = True) -> int:
+        """Return the size of vocabulary, with or without added tokens.
+
+        Args:
+            with_added_tokens: (`optional`) bool:
+                Whether to count in added special tokens or not
+
+        Returns:
+            Size of vocabulary
+        """
+        return self._tokenizer.get_vocab_size(with_added_tokens=with_added_tokens)
+
+    def enable_padding(
+        self,
+        direction: Optional[str] = "right",
+        pad_to_multiple_of: Optional[int] = None,
+        pad_id: Optional[int] = 0,
+        pad_type_id: Optional[int] = 0,
+        pad_token: Optional[str] = "[PAD]",
+        length: Optional[int] = None,
+    ):
+        """Change the padding strategy
+
+        Args:
+            direction: (`optional`) str:
+                Can be one of: `right` or `left`
+
+            pad_to_multiple_of: (`optional`) unsigned int:
+                If specified, the padding length should always snap to the next multiple of
+                the given value. For example if we were going to pad with a length of 250 but
+                `pad_to_multiple_of=8` then we will pad to 256.
+
+            pad_id: (`optional`) unsigned int:
+                The indice to be used when padding
+
+            pad_type_id: (`optional`) unsigned int:
+                The type indice to be used when padding
+
+            pad_token: (`optional`) str:
+                The pad token to be used when padding
+
+            length: (`optional`) unsigned int:
+                If specified, the length at which to pad. If not specified
+                we pad using the size of the longest sequence in a batch
+        """
+        return self._tokenizer.enable_padding(
+            direction=direction,
+            pad_to_multiple_of=pad_to_multiple_of,
+            pad_id=pad_id,
+            pad_type_id=pad_type_id,
+            pad_token=pad_token,
+            length=length,
+        )
+
+    def no_padding(self):
+        """Disable padding"""
+        return self._tokenizer.no_padding()
+
+    @property
+    def padding(self) -> Optional[dict]:
+        """Get the current padding parameters
+
+        Returns:
+            None if padding is disabled, a dict with the currently set parameters
+            if the padding is enabled.
+        """
+        return self._tokenizer.padding
+
+    def enable_truncation(self, max_length: int, stride: Optional[int] = 0, strategy: Optional[str] = "longest_first"):
+        """Change the truncation options
+
+        Args:
+            max_length: unsigned int:
+                The maximum length at which to truncate
+
+            stride: (`optional`) unsigned int:
+                The length of the previous first sequence to be included
+                in the overflowing sequence
+
+            strategy: (`optional`) str:
+                Can be one of `longest_first`, `only_first` or `only_second`
+        """
+        return self._tokenizer.enable_truncation(max_length, stride=stride, strategy=strategy)
+
+    def no_truncation(self):
+        """Disable truncation"""
+        return self._tokenizer.no_truncation()
+
+    @property
+    def truncation(self) -> Optional[dict]:
+        """Get the current truncation parameters
+
+        Returns:
+            None if truncation is disabled, a dict with the current truncation parameters if
+            truncation is enabled
+        """
+        return self._tokenizer.truncation
+
+    def add_tokens(self, tokens: List[Union[str, AddedToken]]) -> int:
+        """Add the given tokens to the vocabulary
+
+        Args:
+            tokens: List[Union[str, AddedToken]]:
+                A list of tokens to add to the vocabulary. Each token can either be
+                a string, or an instance of AddedToken
+
+        Returns:
+            The number of tokens that were added to the vocabulary
+        """
+        return self._tokenizer.add_tokens(tokens)
+
+    def add_special_tokens(self, special_tokens: List[Union[str, AddedToken]]) -> int:
+        """Add the given special tokens to the vocabulary, and treat them as special tokens.
+
+        The special tokens will never be processed by the model, and will be
+        removed while decoding.
+
+        Args:
+            tokens: List[Union[str, AddedToken]]:
+                A list of special tokens to add to the vocabulary. Each token can either be
+                a string, or an instance of AddedToken
+
+        Returns:
+            The number of tokens that were added to the vocabulary
+        """
+        return self._tokenizer.add_special_tokens(special_tokens)
+
+    def normalize(self, sequence: str) -> str:
+        """Normalize the given sequence
+
+        Args:
+            sequence: str:
+                The sequence to normalize
+
+        Returns:
+            The normalized string
+        """
+        return self._tokenizer.normalize(sequence)
+
+    def encode(
+        self,
+        sequence: InputSequence,
+        pair: Optional[InputSequence] = None,
+        is_pretokenized: bool = False,
+        add_special_tokens: bool = True,
+    ) -> Encoding:
+        """Encode the given sequence and pair. This method can process raw text sequences as well
+        as already pre-tokenized sequences.
+
+        Args:
+            sequence: InputSequence:
+                The sequence we want to encode. This sequence can be either raw text or
+                pre-tokenized, according to the `is_pretokenized` argument:
+
+                - If `is_pretokenized=False`: `InputSequence` is expected to be `str`
+                - If `is_pretokenized=True`: `InputSequence` is expected to be
+                    `Union[List[str], Tuple[str]]`
+
+            is_pretokenized: bool:
+                Whether the input is already pre-tokenized.
+
+            add_special_tokens: bool:
+                Whether to add the special tokens while encoding.
+
+        Returns:
+            An Encoding
+        """
+        if sequence is None:
+            raise ValueError("encode: `sequence` can't be `None`")
+
+        return self._tokenizer.encode(sequence, pair, is_pretokenized, add_special_tokens)
+
+    def encode_batch(
+        self,
+        inputs: List[EncodeInput],
+        is_pretokenized: bool = False,
+        add_special_tokens: bool = True,
+    ) -> List[Encoding]:
+        """Encode the given inputs. This method accept both raw text sequences as well as already
+        pre-tokenized sequences.
+
+        Args:
+            inputs: List[EncodeInput]:
+                A list of single sequences or pair sequences to encode. Each `EncodeInput` is
+                expected to be of the following form:
+                    `Union[InputSequence, Tuple[InputSequence, InputSequence]]`
+
+                Each `InputSequence` can either be raw text or pre-tokenized,
+                according to the `is_pretokenized` argument:
+
+                - If `is_pretokenized=False`: `InputSequence` is expected to be `str`
+                - If `is_pretokenized=True`: `InputSequence` is expected to be
+                    `Union[List[str], Tuple[str]]`
+
+            is_pretokenized: bool:
+                Whether the input is already pre-tokenized.
+
+            add_special_tokens: bool:
+                Whether to add the special tokens while encoding.
+
+        Returns:
+            A list of Encoding
+        """
+
+        if inputs is None:
+            raise ValueError("encode_batch: `inputs` can't be `None`")
+
+        return self._tokenizer.encode_batch(inputs, is_pretokenized, add_special_tokens)
+
+    def decode(self, ids: List[int], skip_special_tokens: Optional[bool] = True) -> str:
+        """Decode the given list of ids to a string sequence
+
+        Args:
+            ids: List[unsigned int]:
+                A list of ids to be decoded
+
+            skip_special_tokens: (`optional`) boolean:
+                Whether to remove all the special tokens from the output string
+
+        Returns:
+            The decoded string
+        """
+        if ids is None:
+            raise ValueError("None input is not valid. Should be a list of integers.")
+
+        return self._tokenizer.decode(ids, skip_special_tokens=skip_special_tokens)
+
+    def decode_batch(self, sequences: List[List[int]], skip_special_tokens: Optional[bool] = True) -> str:
+        """Decode the list of sequences to a list of string sequences
+
+        Args:
+            sequences: List[List[unsigned int]]:
+                A list of sequence of ids to be decoded
+
+            skip_special_tokens: (`optional`) boolean:
+                Whether to remove all the special tokens from the output strings
+
+        Returns:
+            A list of decoded strings
+        """
+        if sequences is None:
+            raise ValueError("None input is not valid. Should be list of list of integers.")
+
+        return self._tokenizer.decode_batch(sequences, skip_special_tokens=skip_special_tokens)
+
+    def token_to_id(self, token: str) -> Optional[int]:
+        """Convert the given token to its corresponding id
+
+        Args:
+            token: str:
+                The token to convert
+
+        Returns:
+            The corresponding id if it exists, None otherwise
+        """
+        return self._tokenizer.token_to_id(token)
+
+    def id_to_token(self, id: int) -> Optional[str]:
+        """Convert the given token id to its corresponding string
+
+        Args:
+            token: id:
+                The token id to convert
+
+        Returns:
+            The corresponding string if it exists, None otherwise
+        """
+        return self._tokenizer.id_to_token(id)
+
+    def save_model(self, directory: str, prefix: Optional[str] = None):
+        """Save the current model to the given directory
+
+        Args:
+            directory: str:
+                A path to the destination directory
+
+            prefix: (Optional) str:
+                An optional prefix, used to prefix each file name
+        """
+        return self._tokenizer.model.save(directory, prefix=prefix)
+
+    def save(self, path: str, pretty: bool = True):
+        """Save the current Tokenizer at the given path
+
+        Args:
+            path: str:
+                A path to the destination Tokenizer file
+        """
+        return self._tokenizer.save(path, pretty)
+
+    def to_str(self, pretty: bool = False):
+        """Get a serialized JSON version of the Tokenizer as a str
+
+        Args:
+            pretty: bool:
+                Whether the JSON string should be prettified
+
+        Returns:
+            str
+        """
+        return self._tokenizer.to_str(pretty)
+
+    def post_process(
+        self, encoding: Encoding, pair: Optional[Encoding] = None, add_special_tokens: bool = True
+    ) -> Encoding:
+        """Apply all the post-processing steps to the given encodings.
+
+        The various steps are:
+            1. Truncate according to global params (provided to `enable_truncation`)
+            2. Apply the PostProcessor
+            3. Pad according to global params. (provided to `enable_padding`)
+
+        Args:
+            encoding: Encoding:
+                The main Encoding to post process
+
+            pair: Optional[Encoding]:
+                An optional pair Encoding
+
+            add_special_tokens: bool:
+                Whether to add special tokens
+
+        Returns:
+            The resulting Encoding
+        """
+        return self._tokenizer.post_process(encoding, pair, add_special_tokens)
+
+    @property
+    def model(self) -> Model:
+        return self._tokenizer.model
+
+    @model.setter
+    def model(self, model: Model):
+        self._tokenizer.model = model
+
+    @property
+    def normalizer(self) -> Normalizer:
+        return self._tokenizer.normalizer
+
+    @normalizer.setter
+    def normalizer(self, normalizer: Normalizer):
+        self._tokenizer.normalizer = normalizer
+
+    @property
+    def pre_tokenizer(self) -> PreTokenizer:
+        return self._tokenizer.pre_tokenizer
+
+    @pre_tokenizer.setter
+    def pre_tokenizer(self, pre_tokenizer: PreTokenizer):
+        self._tokenizer.pre_tokenizer = pre_tokenizer
+
+    @property
+    def post_processor(self) -> PostProcessor:
+        return self._tokenizer.post_processor
+
+    @post_processor.setter
+    def post_processor(self, post_processor: PostProcessor):
+        self._tokenizer.post_processor = post_processor
+
+    @property
+    def decoder(self) -> Decoder:
+        return self._tokenizer.decoder
+
+    @decoder.setter
+    def decoder(self, decoder: Decoder):
+        self._tokenizer.decoder = decoder

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/bert_wordpiece.py

@@ -0,0 +1,151 @@
+from typing import Dict, Iterator, List, Optional, Union
+
+from tokenizers import AddedToken, Tokenizer, decoders, trainers
+from tokenizers.models import WordPiece
+from tokenizers.normalizers import BertNormalizer
+from tokenizers.pre_tokenizers import BertPreTokenizer
+from tokenizers.processors import BertProcessing
+
+from .base_tokenizer import BaseTokenizer
+
+
+class BertWordPieceTokenizer(BaseTokenizer):
+    """Bert WordPiece Tokenizer"""
+
+    def __init__(
+        self,
+        vocab: Optional[Union[str, Dict[str, int]]] = None,
+        unk_token: Union[str, AddedToken] = "[UNK]",
+        sep_token: Union[str, AddedToken] = "[SEP]",
+        cls_token: Union[str, AddedToken] = "[CLS]",
+        pad_token: Union[str, AddedToken] = "[PAD]",
+        mask_token: Union[str, AddedToken] = "[MASK]",
+        clean_text: bool = True,
+        handle_chinese_chars: bool = True,
+        strip_accents: Optional[bool] = None,
+        lowercase: bool = True,
+        wordpieces_prefix: str = "##",
+    ):
+        if vocab is not None:
+            tokenizer = Tokenizer(WordPiece(vocab, unk_token=str(unk_token)))
+        else:
+            tokenizer = Tokenizer(WordPiece(unk_token=str(unk_token)))
+
+        # Let the tokenizer know about special tokens if they are part of the vocab
+        if tokenizer.token_to_id(str(unk_token)) is not None:
+            tokenizer.add_special_tokens([str(unk_token)])
+        if tokenizer.token_to_id(str(sep_token)) is not None:
+            tokenizer.add_special_tokens([str(sep_token)])
+        if tokenizer.token_to_id(str(cls_token)) is not None:
+            tokenizer.add_special_tokens([str(cls_token)])
+        if tokenizer.token_to_id(str(pad_token)) is not None:
+            tokenizer.add_special_tokens([str(pad_token)])
+        if tokenizer.token_to_id(str(mask_token)) is not None:
+            tokenizer.add_special_tokens([str(mask_token)])
+
+        tokenizer.normalizer = BertNormalizer(
+            clean_text=clean_text,
+            handle_chinese_chars=handle_chinese_chars,
+            strip_accents=strip_accents,
+            lowercase=lowercase,
+        )
+        tokenizer.pre_tokenizer = BertPreTokenizer()
+
+        if vocab is not None:
+            sep_token_id = tokenizer.token_to_id(str(sep_token))
+            if sep_token_id is None:
+                raise TypeError("sep_token not found in the vocabulary")
+            cls_token_id = tokenizer.token_to_id(str(cls_token))
+            if cls_token_id is None:
+                raise TypeError("cls_token not found in the vocabulary")
+
+            tokenizer.post_processor = BertProcessing((str(sep_token), sep_token_id), (str(cls_token), cls_token_id))
+        tokenizer.decoder = decoders.WordPiece(prefix=wordpieces_prefix)
+
+        parameters = {
+            "model": "BertWordPiece",
+            "unk_token": unk_token,
+            "sep_token": sep_token,
+            "cls_token": cls_token,
+            "pad_token": pad_token,
+            "mask_token": mask_token,
+            "clean_text": clean_text,
+            "handle_chinese_chars": handle_chinese_chars,
+            "strip_accents": strip_accents,
+            "lowercase": lowercase,
+            "wordpieces_prefix": wordpieces_prefix,
+        }
+
+        super().__init__(tokenizer, parameters)
+
+    @staticmethod
+    def from_file(vocab: str, **kwargs):
+        vocab = WordPiece.read_file(vocab)
+        return BertWordPieceTokenizer(vocab, **kwargs)
+
+    def train(
+        self,
+        files: Union[str, List[str]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        limit_alphabet: int = 1000,
+        initial_alphabet: List[str] = [],
+        special_tokens: List[Union[str, AddedToken]] = [
+            "[PAD]",
+            "[UNK]",
+            "[CLS]",
+            "[SEP]",
+            "[MASK]",
+        ],
+        show_progress: bool = True,
+        wordpieces_prefix: str = "##",
+    ):
+        """Train the model using the given files"""
+
+        trainer = trainers.WordPieceTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            limit_alphabet=limit_alphabet,
+            initial_alphabet=initial_alphabet,
+            special_tokens=special_tokens,
+            show_progress=show_progress,
+            continuing_subword_prefix=wordpieces_prefix,
+        )
+        if isinstance(files, str):
+            files = [files]
+        self._tokenizer.train(files, trainer=trainer)
+
+    def train_from_iterator(
+        self,
+        iterator: Union[Iterator[str], Iterator[Iterator[str]]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        limit_alphabet: int = 1000,
+        initial_alphabet: List[str] = [],
+        special_tokens: List[Union[str, AddedToken]] = [
+            "[PAD]",
+            "[UNK]",
+            "[CLS]",
+            "[SEP]",
+            "[MASK]",
+        ],
+        show_progress: bool = True,
+        wordpieces_prefix: str = "##",
+        length: Optional[int] = None,
+    ):
+        """Train the model using the given iterator"""
+
+        trainer = trainers.WordPieceTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            limit_alphabet=limit_alphabet,
+            initial_alphabet=initial_alphabet,
+            special_tokens=special_tokens,
+            show_progress=show_progress,
+            continuing_subword_prefix=wordpieces_prefix,
+        )
+        self._tokenizer.train_from_iterator(
+            iterator,
+            trainer=trainer,
+            length=length,
+        )

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/byte_level_bpe.py

@@ -0,0 +1,122 @@
+from typing import Dict, Iterator, List, Optional, Tuple, Union
+
+from tokenizers import AddedToken, Tokenizer, decoders, pre_tokenizers, processors, trainers
+from tokenizers.models import BPE
+from tokenizers.normalizers import Lowercase, Sequence, unicode_normalizer_from_str
+
+from .base_tokenizer import BaseTokenizer
+
+
+class ByteLevelBPETokenizer(BaseTokenizer):
+    """ByteLevelBPETokenizer
+
+    Represents a Byte-level BPE as introduced by OpenAI with their GPT-2 model
+    """
+
+    def __init__(
+        self,
+        vocab: Optional[Union[str, Dict[str, int]]] = None,
+        merges: Optional[Union[str, Dict[Tuple[int, int], Tuple[int, int]]]] = None,
+        add_prefix_space: bool = False,
+        lowercase: bool = False,
+        dropout: Optional[float] = None,
+        unicode_normalizer: Optional[str] = None,
+        continuing_subword_prefix: Optional[str] = None,
+        end_of_word_suffix: Optional[str] = None,
+        trim_offsets: bool = False,
+    ):
+        if vocab is not None and merges is not None:
+            tokenizer = Tokenizer(
+                BPE(
+                    vocab,
+                    merges,
+                    dropout=dropout,
+                    continuing_subword_prefix=continuing_subword_prefix or "",
+                    end_of_word_suffix=end_of_word_suffix or "",
+                )
+            )
+        else:
+            tokenizer = Tokenizer(BPE())
+
+        # Check for Unicode normalization first (before everything else)
+        normalizers = []
+
+        if unicode_normalizer:
+            normalizers += [unicode_normalizer_from_str(unicode_normalizer)]
+
+        if lowercase:
+            normalizers += [Lowercase()]
+
+        # Create the normalizer structure
+        if len(normalizers) > 0:
+            if len(normalizers) > 1:
+                tokenizer.normalizer = Sequence(normalizers)
+            else:
+                tokenizer.normalizer = normalizers[0]
+
+        tokenizer.pre_tokenizer = pre_tokenizers.ByteLevel(add_prefix_space=add_prefix_space)
+        tokenizer.decoder = decoders.ByteLevel()
+        tokenizer.post_processor = processors.ByteLevel(trim_offsets=trim_offsets)
+
+        parameters = {
+            "model": "ByteLevelBPE",
+            "add_prefix_space": add_prefix_space,
+            "lowercase": lowercase,
+            "dropout": dropout,
+            "unicode_normalizer": unicode_normalizer,
+            "continuing_subword_prefix": continuing_subword_prefix,
+            "end_of_word_suffix": end_of_word_suffix,
+            "trim_offsets": trim_offsets,
+        }
+
+        super().__init__(tokenizer, parameters)
+
+    @staticmethod
+    def from_file(vocab_filename: str, merges_filename: str, **kwargs):
+        vocab, merges = BPE.read_file(vocab_filename, merges_filename)
+        return ByteLevelBPETokenizer(vocab, merges, **kwargs)
+
+    def train(
+        self,
+        files: Union[str, List[str]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        show_progress: bool = True,
+        special_tokens: List[Union[str, AddedToken]] = [],
+    ):
+        """Train the model using the given files"""
+
+        trainer = trainers.BpeTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            show_progress=show_progress,
+            special_tokens=special_tokens,
+            initial_alphabet=pre_tokenizers.ByteLevel.alphabet(),
+        )
+        if isinstance(files, str):
+            files = [files]
+        self._tokenizer.train(files, trainer=trainer)
+
+    def train_from_iterator(
+        self,
+        iterator: Union[Iterator[str], Iterator[Iterator[str]]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        show_progress: bool = True,
+        special_tokens: List[Union[str, AddedToken]] = [],
+        length: Optional[int] = None,
+    ):
+        """Train the model using the given iterator"""
+
+        trainer = trainers.BpeTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            show_progress=show_progress,
+            special_tokens=special_tokens,
+            initial_alphabet=pre_tokenizers.ByteLevel.alphabet(),
+        )
+        self._tokenizer.train_from_iterator(
+            iterator,
+            trainer=trainer,
+            length=length,
+        )

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/char_level_bpe.py

@@ -0,0 +1,150 @@
+from typing import Dict, Iterator, List, Optional, Tuple, Union
+
+from .. import AddedToken, Tokenizer, decoders, pre_tokenizers, trainers
+from ..models import BPE
+from ..normalizers import BertNormalizer, Lowercase, Sequence, unicode_normalizer_from_str
+from .base_tokenizer import BaseTokenizer
+
+
+class CharBPETokenizer(BaseTokenizer):
+    """Original BPE Tokenizer
+
+    Represents the BPE algorithm, as introduced by Rico Sennrich
+    (https://arxiv.org/abs/1508.07909)
+
+    The defaults settings corresponds to OpenAI GPT BPE tokenizers and differs from the original
+    Sennrich subword-nmt implementation by the following options that you can deactivate:
+        - adding a normalizer to clean up the text (deactivate with `bert_normalizer=False`) by:
+            * removing any control characters and replacing all whitespaces by the classic one.
+            * handle chinese chars by putting spaces around them.
+            * strip all accents.
+        - spitting on punctuation in addition to whitespaces (deactivate it with
+          `split_on_whitespace_only=True`)
+    """
+
+    def __init__(
+        self,
+        vocab: Optional[Union[str, Dict[str, int]]] = None,
+        merges: Optional[Union[str, Dict[Tuple[int, int], Tuple[int, int]]]] = None,
+        unk_token: Union[str, AddedToken] = "<unk>",
+        suffix: str = "</w>",
+        dropout: Optional[float] = None,
+        lowercase: bool = False,
+        unicode_normalizer: Optional[str] = None,
+        bert_normalizer: bool = True,
+        split_on_whitespace_only: bool = False,
+    ):
+        if vocab is not None and merges is not None:
+            tokenizer = Tokenizer(
+                BPE(
+                    vocab,
+                    merges,
+                    dropout=dropout,
+                    unk_token=str(unk_token),
+                    end_of_word_suffix=suffix,
+                )
+            )
+        else:
+            tokenizer = Tokenizer(BPE(unk_token=str(unk_token), dropout=dropout, end_of_word_suffix=suffix))
+
+        if tokenizer.token_to_id(str(unk_token)) is not None:
+            tokenizer.add_special_tokens([str(unk_token)])
+
+        # Check for Unicode normalization first (before everything else)
+        normalizers = []
+
+        if unicode_normalizer:
+            normalizers += [unicode_normalizer_from_str(unicode_normalizer)]
+
+        if bert_normalizer:
+            normalizers += [BertNormalizer(lowercase=False)]
+
+        if lowercase:
+            normalizers += [Lowercase()]
+
+        # Create the normalizer structure
+        if len(normalizers) > 0:
+            if len(normalizers) > 1:
+                tokenizer.normalizer = Sequence(normalizers)
+            else:
+                tokenizer.normalizer = normalizers[0]
+
+        if split_on_whitespace_only:
+            tokenizer.pre_tokenizer = pre_tokenizers.WhitespaceSplit()
+        else:
+            tokenizer.pre_tokenizer = pre_tokenizers.BertPreTokenizer()
+
+        tokenizer.decoder = decoders.BPEDecoder(suffix=suffix)
+
+        parameters = {
+            "model": "BPE",
+            "unk_token": unk_token,
+            "suffix": suffix,
+            "dropout": dropout,
+            "lowercase": lowercase,
+            "unicode_normalizer": unicode_normalizer,
+            "bert_normalizer": bert_normalizer,
+            "split_on_whitespace_only": split_on_whitespace_only,
+        }
+
+        super().__init__(tokenizer, parameters)
+
+    @staticmethod
+    def from_file(vocab_filename: str, merges_filename: str, **kwargs):
+        vocab, merges = BPE.read_file(vocab_filename, merges_filename)
+        return CharBPETokenizer(vocab, merges, **kwargs)
+
+    def train(
+        self,
+        files: Union[str, List[str]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        special_tokens: List[Union[str, AddedToken]] = ["<unk>"],
+        limit_alphabet: int = 1000,
+        initial_alphabet: List[str] = [],
+        suffix: Optional[str] = "</w>",
+        show_progress: bool = True,
+    ):
+        """Train the model using the given files"""
+
+        trainer = trainers.BpeTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            special_tokens=special_tokens,
+            limit_alphabet=limit_alphabet,
+            initial_alphabet=initial_alphabet,
+            end_of_word_suffix=suffix,
+            show_progress=show_progress,
+        )
+        if isinstance(files, str):
+            files = [files]
+        self._tokenizer.train(files, trainer=trainer)
+
+    def train_from_iterator(
+        self,
+        iterator: Union[Iterator[str], Iterator[Iterator[str]]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        special_tokens: List[Union[str, AddedToken]] = ["<unk>"],
+        limit_alphabet: int = 1000,
+        initial_alphabet: List[str] = [],
+        suffix: Optional[str] = "</w>",
+        show_progress: bool = True,
+        length: Optional[int] = None,
+    ):
+        """Train the model using the given iterator"""
+
+        trainer = trainers.BpeTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            special_tokens=special_tokens,
+            limit_alphabet=limit_alphabet,
+            initial_alphabet=initial_alphabet,
+            end_of_word_suffix=suffix,
+            show_progress=show_progress,
+        )
+        self._tokenizer.train_from_iterator(
+            iterator,
+            trainer=trainer,
+            length=length,
+        )

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/sentencepiece_bpe.py

@@ -0,0 +1,103 @@
+from typing import Dict, Iterator, List, Optional, Tuple, Union
+
+from tokenizers import AddedToken, Tokenizer, decoders, pre_tokenizers, trainers
+from tokenizers.models import BPE
+from tokenizers.normalizers import NFKC
+
+from .base_tokenizer import BaseTokenizer
+
+
+class SentencePieceBPETokenizer(BaseTokenizer):
+    """SentencePiece BPE Tokenizer
+
+    Represents the BPE algorithm, with the pretokenization used by SentencePiece
+    """
+
+    def __init__(
+        self,
+        vocab: Optional[Union[str, Dict[str, int]]] = None,
+        merges: Optional[Union[str, Dict[Tuple[int, int], Tuple[int, int]]]] = None,
+        unk_token: Union[str, AddedToken] = "<unk>",
+        replacement: str = "▁",
+        add_prefix_space: bool = True,
+        dropout: Optional[float] = None,
+        fuse_unk: Optional[bool] = False,
+    ):
+        if vocab is not None and merges is not None:
+            tokenizer = Tokenizer(BPE(vocab, merges, dropout=dropout, unk_token=unk_token, fuse_unk=fuse_unk))
+        else:
+            tokenizer = Tokenizer(BPE(dropout=dropout, unk_token=unk_token, fuse_unk=fuse_unk))
+
+        if tokenizer.token_to_id(str(unk_token)) is not None:
+            tokenizer.add_special_tokens([str(unk_token)])
+
+        tokenizer.normalizer = NFKC()
+        prepend_scheme = "always" if add_prefix_space else "never"
+        tokenizer.pre_tokenizer = pre_tokenizers.Metaspace(replacement=replacement, prepend_scheme=prepend_scheme)
+        tokenizer.decoder = decoders.Metaspace(replacement=replacement, prepend_scheme=prepend_scheme)
+
+        parameters = {
+            "model": "SentencePieceBPE",
+            "unk_token": unk_token,
+            "replacement": replacement,
+            "add_prefix_space": add_prefix_space,
+            "dropout": dropout,
+        }
+
+        super().__init__(tokenizer, parameters)
+
+    @staticmethod
+    def from_file(vocab_filename: str, merges_filename: str, **kwargs):
+        vocab, merges = BPE.read_file(vocab_filename, merges_filename)
+        return SentencePieceBPETokenizer(vocab, merges, **kwargs)
+
+    def train(
+        self,
+        files: Union[str, List[str]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        special_tokens: List[Union[str, AddedToken]] = ["<unk>"],
+        limit_alphabet: int = 1000,
+        initial_alphabet: List[str] = [],
+        show_progress: bool = True,
+    ):
+        """Train the model using the given files"""
+
+        trainer = trainers.BpeTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            special_tokens=special_tokens,
+            limit_alphabet=limit_alphabet,
+            initial_alphabet=initial_alphabet,
+            show_progress=show_progress,
+        )
+        if isinstance(files, str):
+            files = [files]
+        self._tokenizer.train(files, trainer=trainer)
+
+    def train_from_iterator(
+        self,
+        iterator: Union[Iterator[str], Iterator[Iterator[str]]],
+        vocab_size: int = 30000,
+        min_frequency: int = 2,
+        special_tokens: List[Union[str, AddedToken]] = ["<unk>"],
+        limit_alphabet: int = 1000,
+        initial_alphabet: List[str] = [],
+        show_progress: bool = True,
+        length: Optional[int] = None,
+    ):
+        """Train the model using the given iterator"""
+
+        trainer = trainers.BpeTrainer(
+            vocab_size=vocab_size,
+            min_frequency=min_frequency,
+            special_tokens=special_tokens,
+            limit_alphabet=limit_alphabet,
+            initial_alphabet=initial_alphabet,
+            show_progress=show_progress,
+        )
+        self._tokenizer.train_from_iterator(
+            iterator,
+            trainer=trainer,
+            length=length,
+        )

llmeval-env/lib/python3.10/site-packages/tokenizers/implementations/sentencepiece_unigram.py

@@ -0,0 +1,196 @@
+import json
+import os
+from typing import Iterator, List, Optional, Union, Tuple
+
+from tokenizers import AddedToken, Regex, Tokenizer, decoders, normalizers, pre_tokenizers, trainers
+from tokenizers.models import Unigram
+
+from .base_tokenizer import BaseTokenizer
+
+
+class SentencePieceUnigramTokenizer(BaseTokenizer):
+    """SentencePiece Unigram Tokenizer
+
+    Represents the Unigram algorithm, with the pretokenization used by SentencePiece
+    """
+
+    def __init__(
+        self,
+        vocab: Optional[List[Tuple[str, float]]] = None,
+        replacement: str = "▁",
+        add_prefix_space: bool = True,
+    ):
+        if vocab is not None:
+            # Let Unigram(..) fail if only one of them is None
+            tokenizer = Tokenizer(Unigram(vocab))
+        else:
+            tokenizer = Tokenizer(Unigram())
+
+        tokenizer.normalizer = normalizers.Sequence(
+            [normalizers.Nmt(), normalizers.NFKC(), normalizers.Replace(Regex(" {2,}"), " ")]
+        )
+        prepend_scheme = "always" if add_prefix_space else "never"
+        tokenizer.pre_tokenizer = pre_tokenizers.Metaspace(replacement=replacement, prepend_scheme=prepend_scheme)
+        tokenizer.decoder = decoders.Metaspace(replacement=replacement, prepend_scheme=prepend_scheme)
+
+        parameters = {
+            "model": "SentencePieceUnigram",
+            "replacement": replacement,
+            "add_prefix_space": add_prefix_space,
+        }
+
+        super().__init__(tokenizer, parameters)
+
+    def train(
+        self,
+        files: Union[str, List[str]],
+        vocab_size: int = 8000,
+        show_progress: bool = True,
+        special_tokens: Optional[List[Union[str, AddedToken]]] = None,
+        initial_alphabet: Optional[List[str]] = None,
+        unk_token: Optional[str] = None,
+    ):
+        """
+        Train the model using the given files
+
+        Args:
+            files (:obj:`List[str]`):
+                A list of path to the files that we should use for training
+            vocab_size (:obj:`int`):
+                The size of the final vocabulary, including all tokens and alphabet.
+            show_progress (:obj:`bool`):
+                Whether to show progress bars while training.
+            special_tokens (:obj:`List[Union[str, AddedToken]]`, `optional`):
+                A list of special tokens the model should know of.
+            initial_alphabet (:obj:`List[str]`, `optional`):
+                A list of characters to include in the initial alphabet, even
+                if not seen in the training dataset.
+                If the strings contain more than one character, only the first one
+                is kept.
+            unk_token (:obj:`str`, `optional`):
+                The unknown token to be used by the model.
+        """
+
+        if special_tokens is None:
+            special_tokens = []
+
+        if initial_alphabet is None:
+            initial_alphabet = []
+
+        trainer = trainers.UnigramTrainer(
+            vocab_size=vocab_size,
+            special_tokens=special_tokens,
+            show_progress=show_progress,
+            initial_alphabet=initial_alphabet,
+            unk_token=unk_token,
+        )
+
+        if isinstance(files, str):
+            files = [files]
+        self._tokenizer.train(files, trainer=trainer)
+
+    def train_from_iterator(
+        self,
+        iterator: Union[Iterator[str], Iterator[Iterator[str]]],
+        vocab_size: int = 8000,
+        show_progress: bool = True,
+        special_tokens: Optional[List[Union[str, AddedToken]]] = None,
+        initial_alphabet: Optional[List[str]] = None,
+        unk_token: Optional[str] = None,
+        length: Optional[int] = None,
+    ):
+        """
+        Train the model using the given iterator
+
+        Args:
+            iterator (:obj:`Union[Iterator[str], Iterator[Iterator[str]]]`):
+                Any iterator over strings or list of strings
+            vocab_size (:obj:`int`):
+                The size of the final vocabulary, including all tokens and alphabet.
+            show_progress (:obj:`bool`):
+                Whether to show progress bars while training.
+            special_tokens (:obj:`List[Union[str, AddedToken]]`, `optional`):
+                A list of special tokens the model should know of.
+            initial_alphabet (:obj:`List[str]`, `optional`):
+                A list of characters to include in the initial alphabet, even
+                if not seen in the training dataset.
+                If the strings contain more than one character, only the first one
+                is kept.
+            unk_token (:obj:`str`, `optional`):
+                The unknown token to be used by the model.
+            length (:obj:`int`, `optional`):
+                The total number of sequences in the iterator. This is used to
+                provide meaningful progress tracking
+        """
+
+        if special_tokens is None:
+            special_tokens = []
+
+        if initial_alphabet is None:
+            initial_alphabet = []
+
+        trainer = trainers.UnigramTrainer(
+            vocab_size=vocab_size,
+            special_tokens=special_tokens,
+            show_progress=show_progress,
+            initial_alphabet=initial_alphabet,
+            unk_token=unk_token,
+        )
+
+        self._tokenizer.train_from_iterator(
+            iterator,
+            trainer=trainer,
+            length=length,
+        )
+
+    @staticmethod
+    def from_spm(filename: str):
+        try:
+            import sys
+
+            sys.path.append(".")
+
+            import sentencepiece_model_pb2 as model
+        except Exception:
+            raise Exception(
+                "You don't seem to have the required protobuf file, in order to use this function you need to run `pip install protobuf` and `wget https://raw.githubusercontent.com/google/sentencepiece/master/python/src/sentencepiece/sentencepiece_model_pb2.py` for us to be able to read the intrinsics of your spm_file. `pip install sentencepiece` is not required."
+            )
+
+        m = model.ModelProto()
+        m.ParseFromString(open(filename, "rb").read())
+
+        precompiled_charsmap = m.normalizer_spec.precompiled_charsmap
+        vocab = [(piece.piece, piece.score) for piece in m.pieces]
+        unk_id = m.trainer_spec.unk_id
+        model_type = m.trainer_spec.model_type
+        byte_fallback = m.trainer_spec.byte_fallback
+        if model_type != 1:
+            raise Exception(
+                "You're trying to run a `Unigram` model but you're file was trained with a different algorithm"
+            )
+
+        replacement = "▁"
+        add_prefix_space = True
+
+        tokenizer = Tokenizer(Unigram(vocab, unk_id, byte_fallback))
+
+        if precompiled_charsmap:
+            tokenizer.normalizer = normalizers.Sequence(
+                [
+                    normalizers.Precompiled(precompiled_charsmap),
+                    normalizers.Replace(Regex(" {2,}"), " "),
+                ]
+            )
+        else:
+            tokenizer.normalizer = normalizers.Sequence([normalizers.Replace(Regex(" {2,}"), " ")])
+        prepend_scheme = "always" if add_prefix_space else "never"
+        tokenizer.pre_tokenizer = pre_tokenizers.Metaspace(replacement=replacement, prepend_scheme=prepend_scheme)
+        tokenizer.decoder = decoders.Metaspace(replacement=replacement, prepend_scheme=prepend_scheme)
+
+        parameters = {
+            "model": "SentencePieceUnigram",
+        }
+
+        obj = BaseTokenizer.__new__(SentencePieceUnigramTokenizer, tokenizer, parameters)
+        BaseTokenizer.__init__(obj, tokenizer, parameters)
+        return obj