mirror of https://github.com/python/cpython
682 lines
24 KiB
Python
682 lines
24 KiB
Python
"""Access to Python's configuration information."""
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import os
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import sys
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import threading
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from os.path import realpath
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__all__ = [
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'get_config_h_filename',
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'get_config_var',
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'get_config_vars',
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'get_makefile_filename',
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'get_path',
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'get_path_names',
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'get_paths',
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'get_platform',
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'get_python_version',
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'get_scheme_names',
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'parse_config_h',
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]
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# Keys for get_config_var() that are never converted to Python integers.
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_ALWAYS_STR = {
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'IPHONEOS_DEPLOYMENT_TARGET',
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'MACOSX_DEPLOYMENT_TARGET',
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}
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_INSTALL_SCHEMES = {
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'posix_prefix': {
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'stdlib': '{installed_base}/{platlibdir}/{implementation_lower}{py_version_short}',
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'platstdlib': '{platbase}/{platlibdir}/{implementation_lower}{py_version_short}',
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'purelib': '{base}/lib/{implementation_lower}{py_version_short}/site-packages',
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'platlib': '{platbase}/{platlibdir}/{implementation_lower}{py_version_short}/site-packages',
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'include':
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'{installed_base}/include/{implementation_lower}{py_version_short}{abiflags}',
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'platinclude':
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'{installed_platbase}/include/{implementation_lower}{py_version_short}{abiflags}',
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'scripts': '{base}/bin',
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'data': '{base}',
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},
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'posix_home': {
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'stdlib': '{installed_base}/lib/{implementation_lower}',
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'platstdlib': '{base}/lib/{implementation_lower}',
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'purelib': '{base}/lib/{implementation_lower}',
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'platlib': '{base}/lib/{implementation_lower}',
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'include': '{installed_base}/include/{implementation_lower}',
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'platinclude': '{installed_base}/include/{implementation_lower}',
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'scripts': '{base}/bin',
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'data': '{base}',
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},
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'nt': {
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'stdlib': '{installed_base}/Lib',
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'platstdlib': '{base}/Lib',
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'purelib': '{base}/Lib/site-packages',
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'platlib': '{base}/Lib/site-packages',
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'include': '{installed_base}/Include',
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'platinclude': '{installed_base}/Include',
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'scripts': '{base}/Scripts',
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'data': '{base}',
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},
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# Downstream distributors can overwrite the default install scheme.
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# This is done to support downstream modifications where distributors change
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# the installation layout (eg. different site-packages directory).
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# So, distributors will change the default scheme to one that correctly
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# represents their layout.
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# This presents an issue for projects/people that need to bootstrap virtual
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# environments, like virtualenv. As distributors might now be customizing
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# the default install scheme, there is no guarantee that the information
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# returned by sysconfig.get_default_scheme/get_paths is correct for
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# a virtual environment, the only guarantee we have is that it is correct
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# for the *current* environment. When bootstrapping a virtual environment,
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# we need to know its layout, so that we can place the files in the
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# correct locations.
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# The "*_venv" install scheme is a scheme to bootstrap virtual environments,
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# essentially identical to the default posix_prefix/nt schemes.
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# Downstream distributors who patch posix_prefix/nt scheme are encouraged to
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# leave the following schemes unchanged
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'posix_venv': {
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'stdlib': '{installed_base}/{platlibdir}/{implementation_lower}{py_version_short}',
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'platstdlib': '{platbase}/{platlibdir}/{implementation_lower}{py_version_short}',
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'purelib': '{base}/lib/{implementation_lower}{py_version_short}/site-packages',
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'platlib': '{platbase}/{platlibdir}/{implementation_lower}{py_version_short}/site-packages',
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'include':
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'{installed_base}/include/{implementation_lower}{py_version_short}{abiflags}',
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'platinclude':
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'{installed_platbase}/include/{implementation_lower}{py_version_short}{abiflags}',
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'scripts': '{base}/bin',
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'data': '{base}',
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},
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'nt_venv': {
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'stdlib': '{installed_base}/Lib',
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'platstdlib': '{base}/Lib',
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'purelib': '{base}/Lib/site-packages',
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'platlib': '{base}/Lib/site-packages',
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'include': '{installed_base}/Include',
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'platinclude': '{installed_base}/Include',
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'scripts': '{base}/Scripts',
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'data': '{base}',
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},
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}
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# For the OS-native venv scheme, we essentially provide an alias:
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if os.name == 'nt':
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_INSTALL_SCHEMES['venv'] = _INSTALL_SCHEMES['nt_venv']
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else:
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_INSTALL_SCHEMES['venv'] = _INSTALL_SCHEMES['posix_venv']
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def _get_implementation():
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return 'Python'
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# NOTE: site.py has copy of this function.
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# Sync it when modify this function.
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def _getuserbase():
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env_base = os.environ.get("PYTHONUSERBASE", None)
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if env_base:
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return env_base
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# Emscripten, iOS, tvOS, VxWorks, WASI, and watchOS have no home directories
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if sys.platform in {"emscripten", "ios", "tvos", "vxworks", "wasi", "watchos"}:
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return None
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def joinuser(*args):
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return os.path.expanduser(os.path.join(*args))
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if os.name == "nt":
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base = os.environ.get("APPDATA") or "~"
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return joinuser(base, _get_implementation())
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if sys.platform == "darwin" and sys._framework:
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return joinuser("~", "Library", sys._framework,
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f"{sys.version_info[0]}.{sys.version_info[1]}")
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return joinuser("~", ".local")
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_HAS_USER_BASE = (_getuserbase() is not None)
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if _HAS_USER_BASE:
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_INSTALL_SCHEMES |= {
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# NOTE: When modifying "purelib" scheme, update site._get_path() too.
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'nt_user': {
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'stdlib': '{userbase}/{implementation}{py_version_nodot_plat}',
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'platstdlib': '{userbase}/{implementation}{py_version_nodot_plat}',
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'purelib': '{userbase}/{implementation}{py_version_nodot_plat}/site-packages',
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'platlib': '{userbase}/{implementation}{py_version_nodot_plat}/site-packages',
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'include': '{userbase}/{implementation}{py_version_nodot_plat}/Include',
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'scripts': '{userbase}/{implementation}{py_version_nodot_plat}/Scripts',
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'data': '{userbase}',
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},
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'posix_user': {
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'stdlib': '{userbase}/{platlibdir}/{implementation_lower}{py_version_short}',
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'platstdlib': '{userbase}/{platlibdir}/{implementation_lower}{py_version_short}',
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'purelib': '{userbase}/lib/{implementation_lower}{py_version_short}/site-packages',
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'platlib': '{userbase}/lib/{implementation_lower}{py_version_short}/site-packages',
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'include': '{userbase}/include/{implementation_lower}{py_version_short}',
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'scripts': '{userbase}/bin',
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'data': '{userbase}',
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},
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'osx_framework_user': {
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'stdlib': '{userbase}/lib/{implementation_lower}',
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'platstdlib': '{userbase}/lib/{implementation_lower}',
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'purelib': '{userbase}/lib/{implementation_lower}/site-packages',
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'platlib': '{userbase}/lib/{implementation_lower}/site-packages',
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'include': '{userbase}/include/{implementation_lower}{py_version_short}',
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'scripts': '{userbase}/bin',
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'data': '{userbase}',
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},
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}
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_SCHEME_KEYS = ('stdlib', 'platstdlib', 'purelib', 'platlib', 'include',
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'scripts', 'data')
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_PY_VERSION = sys.version.split()[0]
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_PY_VERSION_SHORT = f'{sys.version_info[0]}.{sys.version_info[1]}'
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_PY_VERSION_SHORT_NO_DOT = f'{sys.version_info[0]}{sys.version_info[1]}'
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_PREFIX = os.path.normpath(sys.prefix)
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_BASE_PREFIX = os.path.normpath(sys.base_prefix)
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_EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
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_BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)
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# Mutex guarding initialization of _CONFIG_VARS.
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_CONFIG_VARS_LOCK = threading.RLock()
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_CONFIG_VARS = None
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# True iff _CONFIG_VARS has been fully initialized.
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_CONFIG_VARS_INITIALIZED = False
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_USER_BASE = None
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def _safe_realpath(path):
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try:
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return realpath(path)
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except OSError:
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return path
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if sys.executable:
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_PROJECT_BASE = os.path.dirname(_safe_realpath(sys.executable))
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else:
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# sys.executable can be empty if argv[0] has been changed and Python is
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# unable to retrieve the real program name
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_PROJECT_BASE = _safe_realpath(os.getcwd())
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# In a virtual environment, `sys._home` gives us the target directory
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# `_PROJECT_BASE` for the executable that created it when the virtual
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# python is an actual executable ('venv --copies' or Windows).
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_sys_home = getattr(sys, '_home', None)
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if _sys_home:
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_PROJECT_BASE = _sys_home
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if os.name == 'nt':
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# In a source build, the executable is in a subdirectory of the root
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# that we want (<root>\PCbuild\<platname>).
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# `_BASE_PREFIX` is used as the base installation is where the source
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# will be. The realpath is needed to prevent mount point confusion
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# that can occur with just string comparisons.
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if _safe_realpath(_PROJECT_BASE).startswith(
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_safe_realpath(f'{_BASE_PREFIX}\\PCbuild')):
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_PROJECT_BASE = _BASE_PREFIX
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# set for cross builds
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if "_PYTHON_PROJECT_BASE" in os.environ:
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_PROJECT_BASE = _safe_realpath(os.environ["_PYTHON_PROJECT_BASE"])
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def is_python_build(check_home=None):
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if check_home is not None:
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import warnings
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warnings.warn("check_home argument is deprecated and ignored.",
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DeprecationWarning, stacklevel=2)
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for fn in ("Setup", "Setup.local"):
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if os.path.isfile(os.path.join(_PROJECT_BASE, "Modules", fn)):
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return True
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return False
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_PYTHON_BUILD = is_python_build()
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if _PYTHON_BUILD:
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for scheme in ('posix_prefix', 'posix_home'):
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# On POSIX-y platforms, Python will:
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# - Build from .h files in 'headers' (which is only added to the
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# scheme when building CPython)
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# - Install .h files to 'include'
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scheme = _INSTALL_SCHEMES[scheme]
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scheme['headers'] = scheme['include']
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scheme['include'] = '{srcdir}/Include'
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scheme['platinclude'] = '{projectbase}/.'
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del scheme
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def _subst_vars(s, local_vars):
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try:
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return s.format(**local_vars)
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except KeyError as var:
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try:
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return s.format(**os.environ)
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except KeyError:
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raise AttributeError(f'{var}') from None
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def _extend_dict(target_dict, other_dict):
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target_keys = target_dict.keys()
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for key, value in other_dict.items():
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if key in target_keys:
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continue
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target_dict[key] = value
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def _expand_vars(scheme, vars):
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res = {}
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if vars is None:
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vars = {}
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_extend_dict(vars, get_config_vars())
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if os.name == 'nt':
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# On Windows we want to substitute 'lib' for schemes rather
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# than the native value (without modifying vars, in case it
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# was passed in)
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vars = vars | {'platlibdir': 'lib'}
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for key, value in _INSTALL_SCHEMES[scheme].items():
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if os.name in ('posix', 'nt'):
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value = os.path.expanduser(value)
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res[key] = os.path.normpath(_subst_vars(value, vars))
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return res
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def _get_preferred_schemes():
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if os.name == 'nt':
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return {
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'prefix': 'nt',
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'home': 'posix_home',
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'user': 'nt_user',
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}
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if sys.platform == 'darwin' and sys._framework:
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return {
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'prefix': 'posix_prefix',
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'home': 'posix_home',
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'user': 'osx_framework_user',
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}
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return {
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'prefix': 'posix_prefix',
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'home': 'posix_home',
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'user': 'posix_user',
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}
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def get_preferred_scheme(key):
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if key == 'prefix' and sys.prefix != sys.base_prefix:
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return 'venv'
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scheme = _get_preferred_schemes()[key]
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if scheme not in _INSTALL_SCHEMES:
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raise ValueError(
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f"{key!r} returned {scheme!r}, which is not a valid scheme "
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f"on this platform"
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)
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return scheme
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def get_default_scheme():
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return get_preferred_scheme('prefix')
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def get_makefile_filename():
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"""Return the path of the Makefile."""
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if _PYTHON_BUILD:
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return os.path.join(_PROJECT_BASE, "Makefile")
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if hasattr(sys, 'abiflags'):
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config_dir_name = f'config-{_PY_VERSION_SHORT}{sys.abiflags}'
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else:
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config_dir_name = 'config'
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if hasattr(sys.implementation, '_multiarch'):
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config_dir_name += f'-{sys.implementation._multiarch}'
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return os.path.join(get_path('stdlib'), config_dir_name, 'Makefile')
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def _get_sysconfigdata_name():
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multiarch = getattr(sys.implementation, '_multiarch', '')
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return os.environ.get(
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'_PYTHON_SYSCONFIGDATA_NAME',
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f'_sysconfigdata_{sys.abiflags}_{sys.platform}_{multiarch}',
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)
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def _init_posix(vars):
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"""Initialize the module as appropriate for POSIX systems."""
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# _sysconfigdata is generated at build time, see _generate_posix_vars()
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name = _get_sysconfigdata_name()
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_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
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build_time_vars = _temp.build_time_vars
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vars.update(build_time_vars)
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def _init_non_posix(vars):
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"""Initialize the module as appropriate for NT"""
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# set basic install directories
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import _winapi
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import _sysconfig
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vars['LIBDEST'] = get_path('stdlib')
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vars['BINLIBDEST'] = get_path('platstdlib')
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vars['INCLUDEPY'] = get_path('include')
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# Add EXT_SUFFIX, SOABI, and Py_GIL_DISABLED
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vars.update(_sysconfig.config_vars())
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vars['LIBDIR'] = _safe_realpath(os.path.join(get_config_var('installed_base'), 'libs'))
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if hasattr(sys, 'dllhandle'):
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dllhandle = _winapi.GetModuleFileName(sys.dllhandle)
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vars['LIBRARY'] = os.path.basename(_safe_realpath(dllhandle))
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vars['LDLIBRARY'] = vars['LIBRARY']
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vars['EXE'] = '.exe'
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vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT
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vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))
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vars['TZPATH'] = ''
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#
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# public APIs
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#
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def parse_config_h(fp, vars=None):
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"""Parse a config.h-style file.
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A dictionary containing name/value pairs is returned. If an
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optional dictionary is passed in as the second argument, it is
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used instead of a new dictionary.
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"""
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if vars is None:
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vars = {}
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import re
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define_rx = re.compile("#define ([A-Z][A-Za-z0-9_]+) (.*)\n")
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undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-z0-9_]+) [*]/\n")
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while True:
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line = fp.readline()
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if not line:
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break
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m = define_rx.match(line)
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if m:
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n, v = m.group(1, 2)
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try:
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if n in _ALWAYS_STR:
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raise ValueError
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v = int(v)
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except ValueError:
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pass
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vars[n] = v
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else:
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m = undef_rx.match(line)
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if m:
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vars[m.group(1)] = 0
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return vars
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def get_config_h_filename():
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"""Return the path of pyconfig.h."""
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if _PYTHON_BUILD:
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if os.name == "nt":
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inc_dir = os.path.dirname(sys._base_executable)
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else:
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inc_dir = _PROJECT_BASE
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else:
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inc_dir = get_path('platinclude')
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return os.path.join(inc_dir, 'pyconfig.h')
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def get_scheme_names():
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"""Return a tuple containing the schemes names."""
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return tuple(sorted(_INSTALL_SCHEMES))
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def get_path_names():
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"""Return a tuple containing the paths names."""
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return _SCHEME_KEYS
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def get_paths(scheme=get_default_scheme(), vars=None, expand=True):
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"""Return a mapping containing an install scheme.
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``scheme`` is the install scheme name. If not provided, it will
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return the default scheme for the current platform.
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"""
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if expand:
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return _expand_vars(scheme, vars)
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else:
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return _INSTALL_SCHEMES[scheme]
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def get_path(name, scheme=get_default_scheme(), vars=None, expand=True):
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"""Return a path corresponding to the scheme.
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``scheme`` is the install scheme name.
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"""
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return get_paths(scheme, vars, expand)[name]
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def _init_config_vars():
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global _CONFIG_VARS
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_CONFIG_VARS = {}
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# Normalized versions of prefix and exec_prefix are handy to have;
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# in fact, these are the standard versions used most places in the
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# Distutils.
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_CONFIG_VARS['prefix'] = _PREFIX
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_CONFIG_VARS['exec_prefix'] = _EXEC_PREFIX
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_CONFIG_VARS['py_version'] = _PY_VERSION
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_CONFIG_VARS['py_version_short'] = _PY_VERSION_SHORT
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_CONFIG_VARS['py_version_nodot'] = _PY_VERSION_SHORT_NO_DOT
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_CONFIG_VARS['installed_base'] = _BASE_PREFIX
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_CONFIG_VARS['base'] = _PREFIX
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_CONFIG_VARS['installed_platbase'] = _BASE_EXEC_PREFIX
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_CONFIG_VARS['platbase'] = _EXEC_PREFIX
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_CONFIG_VARS['projectbase'] = _PROJECT_BASE
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_CONFIG_VARS['platlibdir'] = sys.platlibdir
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_CONFIG_VARS['implementation'] = _get_implementation()
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_CONFIG_VARS['implementation_lower'] = _get_implementation().lower()
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try:
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_CONFIG_VARS['abiflags'] = sys.abiflags
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except AttributeError:
|
|
# sys.abiflags may not be defined on all platforms.
|
|
_CONFIG_VARS['abiflags'] = ''
|
|
try:
|
|
_CONFIG_VARS['py_version_nodot_plat'] = sys.winver.replace('.', '')
|
|
except AttributeError:
|
|
_CONFIG_VARS['py_version_nodot_plat'] = ''
|
|
|
|
if os.name == 'nt':
|
|
_init_non_posix(_CONFIG_VARS)
|
|
_CONFIG_VARS['VPATH'] = sys._vpath
|
|
if os.name == 'posix':
|
|
_init_posix(_CONFIG_VARS)
|
|
if _HAS_USER_BASE:
|
|
# Setting 'userbase' is done below the call to the
|
|
# init function to enable using 'get_config_var' in
|
|
# the init-function.
|
|
_CONFIG_VARS['userbase'] = _getuserbase()
|
|
|
|
# Always convert srcdir to an absolute path
|
|
srcdir = _CONFIG_VARS.get('srcdir', _PROJECT_BASE)
|
|
if os.name == 'posix':
|
|
if _PYTHON_BUILD:
|
|
# If srcdir is a relative path (typically '.' or '..')
|
|
# then it should be interpreted relative to the directory
|
|
# containing Makefile.
|
|
base = os.path.dirname(get_makefile_filename())
|
|
srcdir = os.path.join(base, srcdir)
|
|
else:
|
|
# srcdir is not meaningful since the installation is
|
|
# spread about the filesystem. We choose the
|
|
# directory containing the Makefile since we know it
|
|
# exists.
|
|
srcdir = os.path.dirname(get_makefile_filename())
|
|
_CONFIG_VARS['srcdir'] = _safe_realpath(srcdir)
|
|
|
|
# OS X platforms require special customization to handle
|
|
# multi-architecture, multi-os-version installers
|
|
if sys.platform == 'darwin':
|
|
import _osx_support
|
|
_osx_support.customize_config_vars(_CONFIG_VARS)
|
|
|
|
global _CONFIG_VARS_INITIALIZED
|
|
_CONFIG_VARS_INITIALIZED = True
|
|
|
|
|
|
def get_config_vars(*args):
|
|
"""With no arguments, return a dictionary of all configuration
|
|
variables relevant for the current platform.
|
|
|
|
On Unix, this means every variable defined in Python's installed Makefile;
|
|
On Windows it's a much smaller set.
|
|
|
|
With arguments, return a list of values that result from looking up
|
|
each argument in the configuration variable dictionary.
|
|
"""
|
|
|
|
# Avoid claiming the lock once initialization is complete.
|
|
if not _CONFIG_VARS_INITIALIZED:
|
|
with _CONFIG_VARS_LOCK:
|
|
# Test again with the lock held to avoid races. Note that
|
|
# we test _CONFIG_VARS here, not _CONFIG_VARS_INITIALIZED,
|
|
# to ensure that recursive calls to get_config_vars()
|
|
# don't re-enter init_config_vars().
|
|
if _CONFIG_VARS is None:
|
|
_init_config_vars()
|
|
|
|
if args:
|
|
vals = []
|
|
for name in args:
|
|
vals.append(_CONFIG_VARS.get(name))
|
|
return vals
|
|
else:
|
|
return _CONFIG_VARS
|
|
|
|
|
|
def get_config_var(name):
|
|
"""Return the value of a single variable using the dictionary returned by
|
|
'get_config_vars()'.
|
|
|
|
Equivalent to get_config_vars().get(name)
|
|
"""
|
|
return get_config_vars().get(name)
|
|
|
|
|
|
def get_platform():
|
|
"""Return a string that identifies the current platform.
|
|
|
|
This is used mainly to distinguish platform-specific build directories and
|
|
platform-specific built distributions. Typically includes the OS name and
|
|
version and the architecture (as supplied by 'os.uname()'), although the
|
|
exact information included depends on the OS; on Linux, the kernel version
|
|
isn't particularly important.
|
|
|
|
Examples of returned values:
|
|
linux-i586
|
|
linux-alpha (?)
|
|
solaris-2.6-sun4u
|
|
|
|
Windows will return one of:
|
|
win-amd64 (64bit Windows on AMD64 (aka x86_64, Intel64, EM64T, etc)
|
|
win32 (all others - specifically, sys.platform is returned)
|
|
|
|
For other non-POSIX platforms, currently just returns 'sys.platform'.
|
|
|
|
"""
|
|
if os.name == 'nt':
|
|
if 'amd64' in sys.version.lower():
|
|
return 'win-amd64'
|
|
if '(arm)' in sys.version.lower():
|
|
return 'win-arm32'
|
|
if '(arm64)' in sys.version.lower():
|
|
return 'win-arm64'
|
|
return sys.platform
|
|
|
|
if os.name != "posix" or not hasattr(os, 'uname'):
|
|
# XXX what about the architecture? NT is Intel or Alpha
|
|
return sys.platform
|
|
|
|
# Set for cross builds explicitly
|
|
if "_PYTHON_HOST_PLATFORM" in os.environ:
|
|
return os.environ["_PYTHON_HOST_PLATFORM"]
|
|
|
|
# Try to distinguish various flavours of Unix
|
|
osname, host, release, version, machine = os.uname()
|
|
|
|
# Convert the OS name to lowercase, remove '/' characters, and translate
|
|
# spaces (for "Power Macintosh")
|
|
osname = osname.lower().replace('/', '')
|
|
machine = machine.replace(' ', '_')
|
|
machine = machine.replace('/', '-')
|
|
|
|
if osname[:5] == "linux":
|
|
if sys.platform == "android":
|
|
osname = "android"
|
|
release = get_config_var("ANDROID_API_LEVEL")
|
|
|
|
# Wheel tags use the ABI names from Android's own tools.
|
|
machine = {
|
|
"x86_64": "x86_64",
|
|
"i686": "x86",
|
|
"aarch64": "arm64_v8a",
|
|
"armv7l": "armeabi_v7a",
|
|
}[machine]
|
|
else:
|
|
# At least on Linux/Intel, 'machine' is the processor --
|
|
# i386, etc.
|
|
# XXX what about Alpha, SPARC, etc?
|
|
return f"{osname}-{machine}"
|
|
elif osname[:5] == "sunos":
|
|
if release[0] >= "5": # SunOS 5 == Solaris 2
|
|
osname = "solaris"
|
|
release = f"{int(release[0]) - 3}.{release[2:]}"
|
|
# We can't use "platform.architecture()[0]" because a
|
|
# bootstrap problem. We use a dict to get an error
|
|
# if some suspicious happens.
|
|
bitness = {2147483647:"32bit", 9223372036854775807:"64bit"}
|
|
machine += f".{bitness[sys.maxsize]}"
|
|
# fall through to standard osname-release-machine representation
|
|
elif osname[:3] == "aix":
|
|
from _aix_support import aix_platform
|
|
return aix_platform()
|
|
elif osname[:6] == "cygwin":
|
|
osname = "cygwin"
|
|
import re
|
|
rel_re = re.compile(r'[\d.]+')
|
|
m = rel_re.match(release)
|
|
if m:
|
|
release = m.group()
|
|
elif osname[:6] == "darwin":
|
|
if sys.platform == "ios":
|
|
release = get_config_vars().get("IPHONEOS_DEPLOYMENT_TARGET", "12.0")
|
|
osname = sys.platform
|
|
machine = sys.implementation._multiarch
|
|
else:
|
|
import _osx_support
|
|
osname, release, machine = _osx_support.get_platform_osx(
|
|
get_config_vars(),
|
|
osname, release, machine)
|
|
|
|
return f"{osname}-{release}-{machine}"
|
|
|
|
|
|
def get_python_version():
|
|
return _PY_VERSION_SHORT
|
|
|
|
|
|
def expand_makefile_vars(s, vars):
|
|
"""Expand Makefile-style variables -- "${foo}" or "$(foo)" -- in
|
|
'string' according to 'vars' (a dictionary mapping variable names to
|
|
values). Variables not present in 'vars' are silently expanded to the
|
|
empty string. The variable values in 'vars' should not contain further
|
|
variable expansions; if 'vars' is the output of 'parse_makefile()',
|
|
you're fine. Returns a variable-expanded version of 's'.
|
|
"""
|
|
import re
|
|
|
|
# This algorithm does multiple expansion, so if vars['foo'] contains
|
|
# "${bar}", it will expand ${foo} to ${bar}, and then expand
|
|
# ${bar}... and so forth. This is fine as long as 'vars' comes from
|
|
# 'parse_makefile()', which takes care of such expansions eagerly,
|
|
# according to make's variable expansion semantics.
|
|
|
|
while True:
|
|
m = re.search(_findvar1_rx, s) or re.search(_findvar2_rx, s)
|
|
if m:
|
|
(beg, end) = m.span()
|
|
s = s[0:beg] + vars.get(m.group(1)) + s[end:]
|
|
else:
|
|
break
|
|
return s
|