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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
'''Expandlibs is a system that allows to replace some libraries with a
descriptor file containing some linking information about them.
The descriptor file format is as follows:
---8<-----
OBJS = a.o b.o ...
LIBS = libfoo.a libbar.a ...
--->8-----
(In the example above, OBJ_SUFFIX is o and LIB_SUFFIX is a).
Expandlibs also canonicalizes how to pass libraries to the linker, such
that only the ${LIB_PREFIX}${ROOT}.${LIB_SUFFIX} form needs to be used:
given a list of files, expandlibs will replace items with the form
${LIB_PREFIX}${ROOT}.${LIB_SUFFIX} following these rules:
- If a ${DLL_PREFIX}${ROOT}.${DLL_SUFFIX} or
${DLL_PREFIX}${ROOT}.${IMPORT_LIB_SUFFIX} file exists, use that instead
- If the ${LIB_PREFIX}${ROOT}.${LIB_SUFFIX} file exists, use it
- If a ${LIB_PREFIX}${ROOT}.${LIB_SUFFIX}.${LIB_DESC_SUFFIX} file exists,
replace ${LIB_PREFIX}${ROOT}.${LIB_SUFFIX} with the OBJS and LIBS the
descriptor contains. And for each of these LIBS, also apply the same
rules.
'''
from __future__ import with_statement
import sys, os, errno
import expandlibs_config as conf
def ensureParentDir(file):
'''Ensures the directory parent to the given file exists'''
dir = os.path.dirname(file)
if dir and not os.path.exists(dir):
try:
os.makedirs(dir)
except OSError, error:
if error.errno != errno.EEXIST:
raise
def relativize(path):
'''Returns a path relative to the current working directory, if it is
shorter than the given path'''
def splitpath(path):
dir, file = os.path.split(path)
if os.path.splitdrive(dir)[1] == os.sep:
return [file]
return splitpath(dir) + [file]
if not os.path.exists(path):
return path
curdir = splitpath(os.path.abspath(os.curdir))
abspath = splitpath(os.path.abspath(path))
while curdir and abspath and curdir[0] == abspath[0]:
del curdir[0]
del abspath[0]
if not curdir and not abspath:
return '.'
relpath = os.path.join(*[os.pardir for i in curdir] + abspath)
if len(path) > len(relpath):
return relpath
return path
def isObject(path):
'''Returns whether the given path points to an object file, that is,
ends with OBJ_SUFFIX or .i_o'''
return os.path.splitext(path)[1] in [conf.OBJ_SUFFIX, '.i_o']
def isDynamicLib(path):
'''Returns whether the given path points to a dynamic library, that is,
ends with DLL_SUFFIX.'''
# On mac, the xul library is named XUL, instead of libxul.dylib. Assume any
# file by that name is a dynamic library.
return os.path.splitext(path)[1] == conf.DLL_SUFFIX or os.path.basename(path) == 'XUL'
class LibDescriptor(dict):
KEYS = ['OBJS', 'LIBS']
def __init__(self, content=None):
'''Creates an instance of a lib descriptor, initialized with contents
from a list of strings when given. This is intended for use with
file.readlines()'''
if isinstance(content, list) and all([isinstance(item, str) for item in content]):
pass
elif content is not None:
raise TypeError("LibDescriptor() arg 1 must be None or a list of strings")
super(LibDescriptor, self).__init__()
for key in self.KEYS:
self[key] = []
if not content:
return
for key, value in [(s.strip() for s in item.split('=', 2)) for item in content if item.find('=') >= 0]:
if key in self.KEYS:
self[key] = value.split()
def __str__(self):
'''Serializes the lib descriptor'''
return '\n'.join('%s = %s' % (k, ' '.join(self[k])) for k in self.KEYS if len(self[k]))
class ExpandArgs(list):
def __init__(self, args):
'''Creates a clone of the |args| list and performs file expansion on
each item it contains'''
super(ExpandArgs, self).__init__()
self._descs = set()
for arg in args:
self += self._expand(arg)
def _expand(self, arg):
'''Internal function doing the actual work'''
(root, ext) = os.path.splitext(arg)
if ext != conf.LIB_SUFFIX or not os.path.basename(root).startswith(conf.LIB_PREFIX):
return [relativize(arg)]
if conf.LIB_PREFIX:
dll = root.replace(conf.LIB_PREFIX, conf.DLL_PREFIX, 1) + conf.DLL_SUFFIX
else:
dll = root + conf.DLL_SUFFIX
if os.path.exists(dll):
if conf.IMPORT_LIB_SUFFIX:
return [relativize(root + conf.IMPORT_LIB_SUFFIX)]
else:
return [relativize(dll)]
return self._expand_desc(arg)
def _expand_desc(self, arg):
'''Internal function taking care of lib descriptor expansion only'''
desc = os.path.abspath(arg + conf.LIBS_DESC_SUFFIX)
if os.path.exists(desc):
if desc in self._descs:
return []
self._descs.add(desc)
with open(desc, 'r') as f:
desc = LibDescriptor(f.readlines())
objs = [relativize(o) for o in desc['OBJS']]
for lib in desc['LIBS']:
objs += self._expand(lib)
return objs
return [relativize(arg)]
if __name__ == '__main__':
print " ".join(ExpandArgs(sys.argv[1:]))
|
