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import ast
from typing import Optional, Union
class CompilationError(Exception):
source_line_count_max_in_message = 12
def _format_message(self) -> str:
node = self.node
if self.src is None:
source_excerpt = " <source unavailable>"
else:
source_excerpt = self.src.split('\n')[:node.lineno][-self.source_line_count_max_in_message:]
if source_excerpt:
source_excerpt.append(' ' * node.col_offset + '^')
source_excerpt = '\n'.join(source_excerpt)
else:
source_excerpt = " <source empty>"
message = "at {}:{}:{}".format(node.lineno, node.col_offset, source_excerpt)
if self.error_message:
message += '\n' + self.error_message
return message
def __init__(self, src: Optional[str], node: ast.AST, error_message: Union[str, None]):
self.src = src
self.node = node
self.error_message = error_message
self.message = self._format_message()
def set_source_code(self, src: Optional[str]):
self.src = src
self.message = self._format_message()
def __str__(self):
return self.message
def __repr__(self):
return "{}({!r})".format(type(self).__name__, self.message)
def __reduce__(self):
# this is necessary to make CompilationError picklable
return type(self), (self.src, self.node, self.error_message)
class CompileTimeAssertionFailure(CompilationError):
"""Specific exception for failed tests in `static_assert` invocations"""
pass
class UnsupportedLanguageConstruct(CompilationError):
pass
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