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"""Utilities parsing and analyzing Python code."""
from __future__ import annotations
import tokenize
from importlib import import_module
from os import path
from typing import TYPE_CHECKING, Any
from sphinx.errors import PycodeError
from sphinx.pycode.parser import Parser
if TYPE_CHECKING:
from inspect import Signature
class ModuleAnalyzer:
annotations: dict[tuple[str, str], str]
attr_docs: dict[tuple[str, str], list[str]]
finals: list[str]
overloads: dict[str, list[Signature]]
tagorder: dict[str, int]
tags: dict[str, tuple[str, int, int]]
# cache for analyzer objects -- caches both by module and file name
cache: dict[tuple[str, str], Any] = {}
@staticmethod
def get_module_source(modname: str) -> tuple[str | None, str | None]:
"""Try to find the source code for a module.
Returns ('filename', 'source'). One of it can be None if
no filename or source found
"""
try:
mod = import_module(modname)
except Exception as err:
raise PycodeError('error importing %r' % modname, err) from err
loader = getattr(mod, '__loader__', None)
filename = getattr(mod, '__file__', None)
if loader and getattr(loader, 'get_source', None):
# prefer Native loader, as it respects #coding directive
try:
source = loader.get_source(modname)
if source:
# no exception and not None - it must be module source
return filename, source
except ImportError:
pass # Try other "source-mining" methods
if filename is None and loader and getattr(loader, 'get_filename', None):
# have loader, but no filename
try:
filename = loader.get_filename(modname)
except ImportError as err:
raise PycodeError('error getting filename for %r' % modname, err) from err
if filename is None:
# all methods for getting filename failed, so raise...
raise PycodeError('no source found for module %r' % modname)
filename = path.normpath(path.abspath(filename))
if filename.lower().endswith(('.pyo', '.pyc')):
filename = filename[:-1]
if not path.isfile(filename) and path.isfile(filename + 'w'):
filename += 'w'
elif not filename.lower().endswith(('.py', '.pyw')):
raise PycodeError('source is not a .py file: %r' % filename)
if not path.isfile(filename):
raise PycodeError('source file is not present: %r' % filename)
return filename, None
@classmethod
def for_string(cls, string: str, modname: str, srcname: str = '<string>',
) -> ModuleAnalyzer:
return cls(string, modname, srcname)
@classmethod
def for_file(cls, filename: str, modname: str) -> ModuleAnalyzer:
if ('file', filename) in cls.cache:
return cls.cache['file', filename]
try:
with tokenize.open(filename) as f:
string = f.read()
obj = cls(string, modname, filename)
cls.cache['file', filename] = obj
except Exception as err:
raise PycodeError('error opening %r' % filename, err) from err
return obj
@classmethod
def for_module(cls, modname: str) -> ModuleAnalyzer:
if ('module', modname) in cls.cache:
entry = cls.cache['module', modname]
if isinstance(entry, PycodeError):
raise entry
return entry
try:
filename, source = cls.get_module_source(modname)
if source is not None:
obj = cls.for_string(source, modname, filename or '<string>')
elif filename is not None:
obj = cls.for_file(filename, modname)
except PycodeError as err:
cls.cache['module', modname] = err
raise
cls.cache['module', modname] = obj
return obj
def __init__(self, source: str, modname: str, srcname: str) -> None:
self.modname = modname # name of the module
self.srcname = srcname # name of the source file
# cache the source code as well
self.code = source
self._analyzed = False
def analyze(self) -> None:
"""Analyze the source code."""
if self._analyzed:
return
try:
parser = Parser(self.code)
parser.parse()
self.attr_docs = {}
for (scope, comment) in parser.comments.items():
if comment:
self.attr_docs[scope] = comment.splitlines() + ['']
else:
self.attr_docs[scope] = ['']
self.annotations = parser.annotations
self.finals = parser.finals
self.overloads = parser.overloads
self.tags = parser.definitions
self.tagorder = parser.deforders
self._analyzed = True
except Exception as exc:
msg = f'parsing {self.srcname!r} failed: {exc!r}'
raise PycodeError(msg) from exc
def find_attr_docs(self) -> dict[tuple[str, str], list[str]]:
"""Find class and module-level attributes and their documentation."""
self.analyze()
return self.attr_docs
def find_tags(self) -> dict[str, tuple[str, int, int]]:
"""Find class, function and method definitions and their location."""
self.analyze()
return self.tags
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