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import imp
import os
import sys
from marshal import Unmarshaller
__debugging__ = False
def __readPycHeader(file):
def read():
return ord(file.read(1))
magic = read() | (read()<<8)
if not ( file.read(1) == '\r' and file.read(1) == '\n' ):
raise TypeError("not valid pyc-file")
mtime = read() | (read()<<8) | (read()<<16) | (read()<<24)
return magic, mtime
def __makeModule(name, code, path):
module = sys.modules.get(name)
if not module:
module = sys.modules[name] = imp.new_module(name)
module.__file__ = path
exec code in module.__dict__
return module
class __Importer(object):
def __init__(self, path):
if __debugging__: print "Importer invoked"
self.__path = path
def find_module(self, fullname, path=None):
if __debugging__:
print "Importer.find_module(fullname=%s, path=%s)" % (
repr(fullname), repr(path))
path = fullname.split('.')
filename = path[-1]
path = path[:-1]
pycfile = os.path.join(self.__path, *(path + [filename + '.pyc']))
pyfile = os.path.join(self.__path, *(path + [filename + '.py']))
if os.path.exists(pycfile):
f = open(pycfile, 'rb')
try:
magic, mtime = __readPycHeader(f)
except:
return None # abort! not a valid pyc-file
f.close()
if os.path.exists(pyfile):
pytime = os.stat(pyfile).st_mtime
if pytime > mtime:
return None # abort! py-file was newer
return self
else:
return None # abort! pyc-file does not exist
def load_module(self, fullname):
path = fullname.split('.')
path[-1] += '.pyc'
filename = os.path.join(self.__path, *path)
f = open(filename, 'rb')
magic, mtime = __readPycHeader(f)
#code = Unmarshaller(f, magic=magic).load()
code = Unmarshaller(f).load()
if __debugging__: print "Successfully loaded:", fullname
return __makeModule( fullname, code, filename )
class __MetaImporter(object):
def __init__(self):
self.__importers = {}
def find_module(self, fullname, path):
if __debugging__: print "MetaImporter.find_module(%s, %s)" % (
repr(fullname), repr(path))
for _path in sys.path:
if _path not in self.__importers:
try:
self.__importers[_path] = __Importer(_path)
except:
self.__importers[_path] = None
importer = self.__importers[_path]
if importer is not None:
loader = importer.find_module(fullname, path)
if loader is not None:
return loader
else:
return None
sys.meta_path.insert(0, __MetaImporter())
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