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python3.11
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coverage
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python.py
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 # For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt """Python source expertise for coverage.py""" from __future__ import annotations import os.path import types import zipimport from typing import Dict, Iterable, Optional, Set, TYPE_CHECKING from coverage import env from coverage.exceptions import CoverageException, NoSource from coverage.files import canonical_filename, relative_filename, zip_location from coverage.misc import expensive, isolate_module, join_regex from coverage.parser import PythonParser from coverage.phystokens import source_token_lines, source_encoding from coverage.plugin import FileReporter from coverage.types import TArc, TLineNo, TMorf, TSourceTokenLines if TYPE_CHECKING: from coverage import Coverage os = isolate_module(os) def read_python_source(filename: str) -> bytes: """Read the Python source text from `filename`. Returns bytes. """ with open(filename, "rb") as f: source = f.read() return source.replace(b"\r\n", b"\n").replace(b"\r", b"\n") def get_python_source(filename: str) -> str: """Return the source code, as unicode.""" base, ext = os.path.splitext(filename) if ext == ".py" and env.WINDOWS: exts = [".py", ".pyw"] else: exts = [ext] source_bytes: Optional[bytes] for ext in exts: try_filename = base + ext if os.path.exists(try_filename): # A regular text file: open it. source_bytes = read_python_source(try_filename) break # Maybe it's in a zip file? source_bytes = get_zip_bytes(try_filename) if source_bytes is not None: break else: # Couldn't find source. raise NoSource(f"No source for code: '{filename}'.") # Replace \f because of http://bugs.python.org/issue19035 source_bytes = source_bytes.replace(b"\f", b" ") source = source_bytes.decode(source_encoding(source_bytes), "replace") # Python code should always end with a line with a newline. if source and source[-1] != "\n": source += "\n" return source def get_zip_bytes(filename: str) -> Optional[bytes]: """Get data from `filename` if it is a zip file path. Returns the bytestring data read from the zip file, or None if no zip file could be found or `filename` isn't in it. The data returned will be an empty string if the file is empty. """ zipfile_inner = zip_location(filename) if zipfile_inner is not None: zipfile, inner = zipfile_inner try: zi = zipimport.zipimporter(zipfile) except zipimport.ZipImportError: return None try: data = zi.get_data(inner) except OSError: return None return data return None def source_for_file(filename: str) -> str: """Return the source filename for `filename`. Given a file name being traced, return the best guess as to the source file to attribute it to. """ if filename.endswith(".py"): # .py files are themselves source files. return filename elif filename.endswith((".pyc", ".pyo")): # Bytecode files probably have source files near them. py_filename = filename[:-1] if os.path.exists(py_filename): # Found a .py file, use that. return py_filename if env.WINDOWS: # On Windows, it could be a .pyw file. pyw_filename = py_filename + "w" if os.path.exists(pyw_filename): return pyw_filename # Didn't find source, but it's probably the .py file we want. return py_filename # No idea, just use the file name as-is. return filename def source_for_morf(morf: TMorf) -> str: """Get the source filename for the module-or-file `morf`.""" if hasattr(morf, "__file__") and morf.__file__: filename = morf.__file__ elif isinstance(morf, types.ModuleType): # A module should have had .__file__, otherwise we can't use it. # This could be a PEP-420 namespace package. raise CoverageException(f"Module {morf} has no file") else: filename = morf filename = source_for_file(filename) return filename class PythonFileReporter(FileReporter): """Report support for a Python file.""" def __init__(self, morf: TMorf, coverage: Optional[Coverage] = None) -> None: self.coverage = coverage filename = source_for_morf(morf) fname = filename canonicalize = True if self.coverage is not None: if self.coverage.config.relative_files: canonicalize = False if canonicalize: fname = canonical_filename(filename) super().__init__(fname) if hasattr(morf, "__name__"): name = morf.__name__.replace(".", os.sep) if os.path.basename(filename).startswith("__init__."): name += os.sep + "__init__" name += ".py" else: name = relative_filename(filename) self.relname = name self._source: Optional[str] = None self._parser: Optional[PythonParser] = None self._excluded = None def __repr__(self) -> str: return f"<PythonFileReporter {self.filename!r}>" def relative_filename(self) -> str: return self.relname @property def parser(self) -> PythonParser: """Lazily create a :class:`PythonParser`.""" assert self.coverage is not None if self._parser is None: self._parser = PythonParser( filename=self.filename, exclude=self.coverage._exclude_regex("exclude"), ) self._parser.parse_source() return self._parser def lines(self) -> Set[TLineNo]: """Return the line numbers of statements in the file.""" return self.parser.statements def excluded_lines(self) -> Set[TLineNo]: """Return the line numbers of statements in the file.""" return self.parser.excluded def translate_lines(self, lines: Iterable[TLineNo]) -> Set[TLineNo]: return self.parser.translate_lines(lines) def translate_arcs(self, arcs: Iterable[TArc]) -> Set[TArc]: return self.parser.translate_arcs(arcs) @expensive def no_branch_lines(self) -> Set[TLineNo]: assert self.coverage is not None no_branch = self.parser.lines_matching( join_regex(self.coverage.config.partial_list), join_regex(self.coverage.config.partial_always_list), ) return no_branch @expensive def arcs(self) -> Set[TArc]: return self.parser.arcs() @expensive def exit_counts(self) -> Dict[TLineNo, int]: return self.parser.exit_counts() def missing_arc_description( self, start: TLineNo, end: TLineNo, executed_arcs: Optional[Iterable[TArc]] = None, ) -> str: return self.parser.missing_arc_description(start, end, executed_arcs) def source(self) -> str: if self._source is None: self._source = get_python_source(self.filename) return self._source def should_be_python(self) -> bool: """Does it seem like this file should contain Python? This is used to decide if a file reported as part of the execution of a program was really likely to have contained Python in the first place. """ # Get the file extension. _, ext = os.path.splitext(self.filename) # Anything named *.py* should be Python. if ext.startswith(".py"): return True # A file with no extension should be Python. if not ext: return True # Everything else is probably not Python. return False def source_token_lines(self) -> TSourceTokenLines: return source_token_lines(self.source())
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