peacock-data-public-datasets-idc-cronscript
/
venv
/lib
/python3.10
/site-packages
/lxml
/html
/soupparser.py
| """External interface to the BeautifulSoup HTML parser. | |
| """ | |
| __all__ = ["fromstring", "parse", "convert_tree"] | |
| import re | |
| from lxml import etree, html | |
| try: | |
| from bs4 import ( | |
| BeautifulSoup, Tag, Comment, ProcessingInstruction, NavigableString, | |
| Declaration, Doctype) | |
| _DECLARATION_OR_DOCTYPE = (Declaration, Doctype) | |
| except ImportError: | |
| from BeautifulSoup import ( | |
| BeautifulSoup, Tag, Comment, ProcessingInstruction, NavigableString, | |
| Declaration) | |
| _DECLARATION_OR_DOCTYPE = Declaration | |
| def fromstring(data, beautifulsoup=None, makeelement=None, **bsargs): | |
| """Parse a string of HTML data into an Element tree using the | |
| BeautifulSoup parser. | |
| Returns the root ``<html>`` Element of the tree. | |
| You can pass a different BeautifulSoup parser through the | |
| `beautifulsoup` keyword, and a diffent Element factory function | |
| through the `makeelement` keyword. By default, the standard | |
| ``BeautifulSoup`` class and the default factory of `lxml.html` are | |
| used. | |
| """ | |
| return _parse(data, beautifulsoup, makeelement, **bsargs) | |
| def parse(file, beautifulsoup=None, makeelement=None, **bsargs): | |
| """Parse a file into an ElemenTree using the BeautifulSoup parser. | |
| You can pass a different BeautifulSoup parser through the | |
| `beautifulsoup` keyword, and a diffent Element factory function | |
| through the `makeelement` keyword. By default, the standard | |
| ``BeautifulSoup`` class and the default factory of `lxml.html` are | |
| used. | |
| """ | |
| if not hasattr(file, 'read'): | |
| file = open(file) | |
| root = _parse(file, beautifulsoup, makeelement, **bsargs) | |
| return etree.ElementTree(root) | |
| def convert_tree(beautiful_soup_tree, makeelement=None): | |
| """Convert a BeautifulSoup tree to a list of Element trees. | |
| Returns a list instead of a single root Element to support | |
| HTML-like soup with more than one root element. | |
| You can pass a different Element factory through the `makeelement` | |
| keyword. | |
| """ | |
| root = _convert_tree(beautiful_soup_tree, makeelement) | |
| children = root.getchildren() | |
| for child in children: | |
| root.remove(child) | |
| return children | |
| # helpers | |
| def _parse(source, beautifulsoup, makeelement, **bsargs): | |
| if beautifulsoup is None: | |
| beautifulsoup = BeautifulSoup | |
| if hasattr(beautifulsoup, "HTML_ENTITIES"): # bs3 | |
| if 'convertEntities' not in bsargs: | |
| bsargs['convertEntities'] = 'html' | |
| if hasattr(beautifulsoup, "DEFAULT_BUILDER_FEATURES"): # bs4 | |
| if 'features' not in bsargs: | |
| bsargs['features'] = 'html.parser' # use Python html parser | |
| tree = beautifulsoup(source, **bsargs) | |
| root = _convert_tree(tree, makeelement) | |
| # from ET: wrap the document in a html root element, if necessary | |
| if len(root) == 1 and root[0].tag == "html": | |
| return root[0] | |
| root.tag = "html" | |
| return root | |
| _parse_doctype_declaration = re.compile( | |
| r'(?:\s|[<!])*DOCTYPE\s*HTML' | |
| r'(?:\s+PUBLIC)?(?:\s+(\'[^\']*\'|"[^"]*"))?' | |
| r'(?:\s+(\'[^\']*\'|"[^"]*"))?', | |
| re.IGNORECASE).match | |
| class _PseudoTag: | |
| # Minimal imitation of BeautifulSoup.Tag | |
| def __init__(self, contents): | |
| self.name = 'html' | |
| self.attrs = [] | |
| self.contents = contents | |
| def __iter__(self): | |
| return self.contents.__iter__() | |
| def _convert_tree(beautiful_soup_tree, makeelement): | |
| if makeelement is None: | |
| makeelement = html.html_parser.makeelement | |
| # Split the tree into three parts: | |
| # i) everything before the root element: document type | |
| # declaration, comments, processing instructions, whitespace | |
| # ii) the root(s), | |
| # iii) everything after the root: comments, processing | |
| # instructions, whitespace | |
| first_element_idx = last_element_idx = None | |
| html_root = declaration = None | |
| for i, e in enumerate(beautiful_soup_tree): | |
| if isinstance(e, Tag): | |
| if first_element_idx is None: | |
| first_element_idx = i | |
| last_element_idx = i | |
| if html_root is None and e.name and e.name.lower() == 'html': | |
| html_root = e | |
| elif declaration is None and isinstance(e, _DECLARATION_OR_DOCTYPE): | |
| declaration = e | |
| # For a nice, well-formatted document, the variable roots below is | |
| # a list consisting of a single <html> element. However, the document | |
| # may be a soup like '<meta><head><title>Hello</head><body>Hi | |
| # all<\p>'. In this example roots is a list containing meta, head | |
| # and body elements. | |
| if first_element_idx is None: | |
| pre_root = post_root = [] | |
| roots = beautiful_soup_tree.contents | |
| else: | |
| pre_root = beautiful_soup_tree.contents[:first_element_idx] | |
| roots = beautiful_soup_tree.contents[first_element_idx:last_element_idx+1] | |
| post_root = beautiful_soup_tree.contents[last_element_idx+1:] | |
| # Reorganize so that there is one <html> root... | |
| if html_root is not None: | |
| # ... use existing one if possible, ... | |
| i = roots.index(html_root) | |
| html_root.contents = roots[:i] + html_root.contents + roots[i+1:] | |
| else: | |
| # ... otherwise create a new one. | |
| html_root = _PseudoTag(roots) | |
| convert_node = _init_node_converters(makeelement) | |
| # Process pre_root | |
| res_root = convert_node(html_root) | |
| prev = res_root | |
| for e in reversed(pre_root): | |
| converted = convert_node(e) | |
| if converted is not None: | |
| prev.addprevious(converted) | |
| prev = converted | |
| # ditto for post_root | |
| prev = res_root | |
| for e in post_root: | |
| converted = convert_node(e) | |
| if converted is not None: | |
| prev.addnext(converted) | |
| prev = converted | |
| if declaration is not None: | |
| try: | |
| # bs4 provides full Doctype string | |
| doctype_string = declaration.output_ready() | |
| except AttributeError: | |
| doctype_string = declaration.string | |
| match = _parse_doctype_declaration(doctype_string) | |
| if not match: | |
| # Something is wrong if we end up in here. Since soupparser should | |
| # tolerate errors, do not raise Exception, just let it pass. | |
| pass | |
| else: | |
| external_id, sys_uri = match.groups() | |
| docinfo = res_root.getroottree().docinfo | |
| # strip quotes and update DOCTYPE values (any of None, '', '...') | |
| docinfo.public_id = external_id and external_id[1:-1] | |
| docinfo.system_url = sys_uri and sys_uri[1:-1] | |
| return res_root | |
| def _init_node_converters(makeelement): | |
| converters = {} | |
| ordered_node_types = [] | |
| def converter(*types): | |
| def add(handler): | |
| for t in types: | |
| converters[t] = handler | |
| ordered_node_types.append(t) | |
| return handler | |
| return add | |
| def find_best_converter(node): | |
| for t in ordered_node_types: | |
| if isinstance(node, t): | |
| return converters[t] | |
| return None | |
| def convert_node(bs_node, parent=None): | |
| # duplicated in convert_tag() below | |
| try: | |
| handler = converters[type(bs_node)] | |
| except KeyError: | |
| handler = converters[type(bs_node)] = find_best_converter(bs_node) | |
| if handler is None: | |
| return None | |
| return handler(bs_node, parent) | |
| def map_attrs(bs_attrs): | |
| if isinstance(bs_attrs, dict): # bs4 | |
| attribs = {} | |
| for k, v in bs_attrs.items(): | |
| if isinstance(v, list): | |
| v = " ".join(v) | |
| attribs[k] = unescape(v) | |
| else: | |
| attribs = {k: unescape(v) for k, v in bs_attrs} | |
| return attribs | |
| def append_text(parent, text): | |
| if len(parent) == 0: | |
| parent.text = (parent.text or '') + text | |
| else: | |
| parent[-1].tail = (parent[-1].tail or '') + text | |
| # converters are tried in order of their definition | |
| def convert_tag(bs_node, parent): | |
| attrs = bs_node.attrs | |
| if parent is not None: | |
| attribs = map_attrs(attrs) if attrs else None | |
| res = etree.SubElement(parent, bs_node.name, attrib=attribs) | |
| else: | |
| attribs = map_attrs(attrs) if attrs else {} | |
| res = makeelement(bs_node.name, attrib=attribs) | |
| for child in bs_node: | |
| # avoid double recursion by inlining convert_node(), see above | |
| try: | |
| handler = converters[type(child)] | |
| except KeyError: | |
| pass | |
| else: | |
| if handler is not None: | |
| handler(child, res) | |
| continue | |
| convert_node(child, res) | |
| return res | |
| def convert_comment(bs_node, parent): | |
| res = html.HtmlComment(bs_node) | |
| if parent is not None: | |
| parent.append(res) | |
| return res | |
| def convert_pi(bs_node, parent): | |
| if bs_node.endswith('?'): | |
| # The PI is of XML style (<?as df?>) but BeautifulSoup | |
| # interpreted it as being SGML style (<?as df>). Fix. | |
| bs_node = bs_node[:-1] | |
| res = etree.ProcessingInstruction(*bs_node.split(' ', 1)) | |
| if parent is not None: | |
| parent.append(res) | |
| return res | |
| def convert_text(bs_node, parent): | |
| if parent is not None: | |
| append_text(parent, unescape(bs_node)) | |
| return None | |
| return convert_node | |
| # copied from ET's ElementSoup | |
| try: | |
| from html.entities import name2codepoint # Python 3 | |
| except ImportError: | |
| from htmlentitydefs import name2codepoint | |
| handle_entities = re.compile(r"&(\w+);").sub | |
| try: | |
| unichr | |
| except NameError: | |
| # Python 3 | |
| unichr = chr | |
| def unescape(string): | |
| if not string: | |
| return '' | |
| # work around oddities in BeautifulSoup's entity handling | |
| def unescape_entity(m): | |
| try: | |
| return unichr(name2codepoint[m.group(1)]) | |
| except KeyError: | |
| return m.group(0) # use as is | |
| return handle_entities(unescape_entity, string) | |