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"""
apipkg: control the exported namespace of a python package.
see http://pypi.python.org/pypi/apipkg
(c) holger krekel, 2009 - MIT license
"""
import os
import sys
from types import ModuleType
__version__ = '1.3.dev'
def _py_abspath(path):
"""
special version of abspath
that will leave paths from jython jars alone
"""
if path.startswith('__pyclasspath__'):
return path
else:
return os.path.abspath(path)
def initpkg(pkgname, exportdefs, attr=dict()):
""" initialize given package from the export definitions. """
oldmod = sys.modules.get(pkgname)
d = {}
f = getattr(oldmod, '__file__', None)
if f:
f = _py_abspath(f)
d['__file__'] = f
if hasattr(oldmod, '__version__'):
d['__version__'] = oldmod.__version__
if hasattr(oldmod, '__loader__'):
d['__loader__'] = oldmod.__loader__
if hasattr(oldmod, '__path__'):
d['__path__'] = [_py_abspath(p) for p in oldmod.__path__]
if '__doc__' not in exportdefs and getattr(oldmod, '__doc__', None):
d['__doc__'] = oldmod.__doc__
d.update(attr)
if hasattr(oldmod, "__dict__"):
oldmod.__dict__.update(d)
mod = ApiModule(pkgname, exportdefs, implprefix=pkgname, attr=d)
sys.modules[pkgname] = mod
def importobj(modpath, attrname):
module = __import__(modpath, None, None, ['__doc__'])
if not attrname:
return module
retval = module
names = attrname.split(".")
for x in names:
retval = getattr(retval, x)
return retval
class ApiModule(ModuleType):
def __docget(self):
try:
return self.__doc
except AttributeError:
if '__doc__' in self.__map__:
return self.__makeattr('__doc__')
def __docset(self, value):
self.__doc = value
__doc__ = property(__docget, __docset)
def __init__(self, name, importspec, implprefix=None, attr=None):
self.__name__ = name
self.__all__ = [x for x in importspec if x != '__onfirstaccess__']
self.__map__ = {}
self.__implprefix__ = implprefix or name
if attr:
for name, val in attr.items():
# print "setting", self.__name__, name, val
setattr(self, name, val)
for name, importspec in importspec.items():
if isinstance(importspec, dict):
subname = '%s.%s' % (self.__name__, name)
apimod = ApiModule(subname, importspec, implprefix)
sys.modules[subname] = apimod
setattr(self, name, apimod)
else:
parts = importspec.split(':')
modpath = parts.pop(0)
attrname = parts and parts[0] or ""
if modpath[0] == '.':
modpath = implprefix + modpath
if not attrname:
subname = '%s.%s' % (self.__name__, name)
apimod = AliasModule(subname, modpath)
sys.modules[subname] = apimod
if '.' not in name:
setattr(self, name, apimod)
else:
self.__map__[name] = (modpath, attrname)
def __repr__(self):
l = []
if hasattr(self, '__version__'):
l.append("version=" + repr(self.__version__))
if hasattr(self, '__file__'):
l.append('from ' + repr(self.__file__))
if l:
return '<ApiModule %r %s>' % (self.__name__, " ".join(l))
return '<ApiModule %r>' % (self.__name__,)
def __makeattr(self, name):
"""lazily compute value for name or raise AttributeError if unknown."""
# print "makeattr", self.__name__, name
target = None
if '__onfirstaccess__' in self.__map__:
target = self.__map__.pop('__onfirstaccess__')
importobj(*target)()
try:
modpath, attrname = self.__map__[name]
except KeyError:
if target is not None and name != '__onfirstaccess__':
# retry, onfirstaccess might have set attrs
return getattr(self, name)
raise AttributeError(name)
else:
result = importobj(modpath, attrname)
setattr(self, name, result)
try:
del self.__map__[name]
except KeyError:
pass # in a recursive-import situation a double-del can happen
return result
__getattr__ = __makeattr
def __dict__(self):
# force all the content of the module to be loaded when __dict__ is read
dictdescr = ModuleType.__dict__['__dict__']
dict = dictdescr.__get__(self)
if dict is not None:
hasattr(self, 'some')
for name in self.__all__:
try:
self.__makeattr(name)
except AttributeError:
pass
return dict
__dict__ = property(__dict__)
def AliasModule(modname, modpath, attrname=None):
mod = []
def getmod():
if not mod:
x = importobj(modpath, None)
if attrname is not None:
x = getattr(x, attrname)
mod.append(x)
return mod[0]
class AliasModule(ModuleType):
def __repr__(self):
x = modpath
if attrname:
x += "." + attrname
return '<AliasModule %r for %r>' % (modname, x)
def __getattribute__(self, name):
try:
return getattr(getmod(), name)
except ImportError:
return None
def __setattr__(self, name, value):
setattr(getmod(), name, value)
def __delattr__(self, name):
delattr(getmod(), name)
return AliasModule(str(modname))
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