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"""
apipkg: control the exported namespace of a Python package.
see https://pypi.python.org/pypi/apipkg
(c) holger krekel, 2009 - MIT license
"""
import os
import sys
from types import ModuleType
from .version import version as __version__ # NOQA:F401
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 distribution_version(name):
"""try to get the version of the named distribution,
returs None on failure"""
from importlib.metadata import PackageNotFoundError, version
try:
return version(name)
except PackageNotFoundError:
return None
def initpkg(pkgname, exportdefs, attr=None, eager=False):
""" initialize given package from the export definitions. """
attr = attr or {}
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 hasattr(oldmod, "__package__"):
d["__package__"] = oldmod.__package__
if "__doc__" not in exportdefs and getattr(oldmod, "__doc__", None):
d["__doc__"] = oldmod.__doc__
d["__spec__"] = getattr(oldmod, "__spec__", None)
d.update(attr)
if hasattr(oldmod, "__dict__"):
oldmod.__dict__.update(d)
mod = ApiModule(pkgname, exportdefs, implprefix=pkgname, attr=d)
sys.modules[pkgname] = mod
# eagerload in bypthon to avoid their monkeypatching breaking packages
if "bpython" in sys.modules or eager:
for module in list(sys.modules.values()):
if isinstance(module, ApiModule):
module.__dict__
return mod
def importobj(modpath, attrname):
"""imports a module, then resolves the attrname on it"""
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):
"""the magical lazy-loading module standing"""
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 = "{}.{}".format(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 = "{}.{}".format(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):
repr_list = []
if hasattr(self, "__version__"):
repr_list.append("version=" + repr(self.__version__))
if hasattr(self, "__file__"):
repr_list.append("from " + repr(self.__file__))
if repr_list:
return "<ApiModule {!r} {}>".format(self.__name__, " ".join(repr_list))
return "<ApiModule {!r}>".format(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
@property
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
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]
x = modpath + ("." + attrname if attrname else "")
repr_result = "<AliasModule {!r} for {!r}>".format(modname, x)
class AliasModule(ModuleType):
def __repr__(self):
return repr_result
def __getattribute__(self, name):
try:
return getattr(getmod(), name)
except ImportError:
if modpath == "pytest" and attrname is None:
# hack for pylibs py.test
return None
else:
raise
def __setattr__(self, name, value):
setattr(getmod(), name, value)
def __delattr__(self, name):
delattr(getmod(), name)
return AliasModule(str(modname))
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