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Optimize importlib's case-sensitivity check by wasting as little time as possible under case-sensitive OSs.

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This commit is contained in:
Brett Cannon 2012-02-17 09:46:48 -05:00
parent 1f14bebe3c
commit f2e86751cc
1 changed files with 23 additions and 13 deletions
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36
Lib/importlib/_bootstrap.py
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@ -19,28 +19,33 @@ work. One should use importlib as the public-facing version of this module.
# Bootstrap-related code ######################################################
# TODO: when not on any of these platforms, replace _case_ok() w/
# ``lambda x,y: True``.
CASE_OK_PLATFORMS = 'win', 'cygwin', 'darwin'
CASE_INSENSITIVE_PLATFORMS = 'win', 'cygwin', 'darwin'
def _case_ok(directory, check):
"""Check if the directory contains something matching 'check'
case-sensitively when running on Windows or OS X.
def _case_insensitive_ok(directory, check):
"""Check if the directory contains something matching 'check' exists in the
directory.
If running on Window or OS X and PYTHONCASEOK is a defined environment
variable then no case-sensitive check is performed. No check is done to see
if what is being checked for exists, so if the platform is not Windows or
OS X then assume the case is fine.
If PYTHONCASEOK is a defined environment variable then skip the
case-sensitivity check.
"""
if (any(map(sys.platform.startswith, CASE_OK_PLATFORMS)) and
b'PYTHONCASEOK' not in _os.environ):
if b'PYTHONCASEOK' not in _os.environ:
if not directory:
directory = '.'
return check in _os.listdir(directory)
else:
return True
def _case_sensitive_ok(directory, check):
"""Under case-sensitive filesystems always assume the case matches.
Since other code does the file existence check, that subsumes a
case-sensitivity check.
"""
return True
_case_ok = None
# TODO: Expose from marshal
@ -1055,7 +1060,7 @@ def _setup(sys_module, imp_module):
modules, those two modules must be explicitly passed in.
"""
global imp, sys
global _case_ok, imp, sys
imp = imp_module
sys = sys_module
@ -1089,6 +1094,11 @@ def _setup(sys_module, imp_module):
setattr(self_module, '_os', os_module)
setattr(self_module, 'path_sep', path_sep)
if sys_module.platform in CASE_INSENSITIVE_PLATFORMS:
_case_ok = _case_insensitive_ok
else:
_case_ok = _case_sensitive_ok
def _install(sys_module, imp_module):
"""Install importlib as the implementation of import.