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Issue #13959: Re-implement imp.cache_from_source() in Lib/imp.py.

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Brett Cannon 2012-04-20 21:44:46 -04:00
parent ed672d6872
commit ea59dbff16
4 changed files with 3003 additions and 3017 deletions
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32
Lib/importlib/_bootstrap.py
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@ -178,6 +178,31 @@ def _new_module(name):
# Finder/loader utility code ##################################################
PYCACHE = '__pycache__'
DEBUG_BYTECODE_SUFFIX = '.pyc'
OPT_BYTECODE_SUFFIX = '.pyo'
BYTECODE_SUFFIX = DEBUG_BYTECODE_SUFFIX if __debug__ else OPT_BYTECODE_SUFFIX
def _cache_from_source(path, debug_override=None):
"""Given the path to a .py file, return the path to its .pyc/.pyo file.
The .py file does not need to exist; this simply returns the path to the
.pyc/.pyo file calculated as if the .py file were imported. The extension
will be .pyc unless __debug__ is not defined, then it will be .pyo.
If debug_override is not None, then it must be a boolean and is taken as
the value of __debug__ instead.
"""
debug = __debug__ if debug_override is None else debug_override
suffix = DEBUG_BYTECODE_SUFFIX if debug else OPT_BYTECODE_SUFFIX
head, tail = _path_split(path)
base_filename, sep, _ = tail.partition('.')
filename = '{}{}{}{}'.format(base_filename, sep, _imp.get_tag(), suffix)
return _path_join(head, PYCACHE, filename)
def verbose_message(message, *args):
"""Print the message to stderr if -v/PYTHONVERBOSE is turned on."""
if sys.flags.verbose:
@ -452,7 +477,7 @@ class _LoaderBasics:
code_object = self.get_code(name)
module.__file__ = self.get_filename(name)
if not sourceless:
module.__cached__ = _imp.cache_from_source(module.__file__)
module.__cached__ = _cache_from_source(module.__file__)
else:
module.__cached__ = module.__file__
module.__package__ = name
@ -515,7 +540,7 @@ class SourceLoader(_LoaderBasics):
"""
source_path = self.get_filename(fullname)
bytecode_path = _imp.cache_from_source(source_path)
bytecode_path = _cache_from_source(source_path)
source_mtime = None
if bytecode_path is not None:
try:
@ -554,9 +579,6 @@ class SourceLoader(_LoaderBasics):
verbose_message('code object from {}', source_path)
if (not sys.dont_write_bytecode and bytecode_path is not None and
source_mtime is not None):
# If e.g. Jython ever implements imp.cache_from_source to have
# their own cached file format, this block of code will most likely
# throw an exception.
data = bytearray(_MAGIC_NUMBER)
data.extend(_w_long(source_mtime))
data.extend(_w_long(len(source_bytes)))