lib-python.2.5.test.test_importhooks.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
import sys
import imp
import os
import unittest
from test import test_support
test_src = """\
def get_name():
return __name__
def get_file():
return __file__
"""
absimp = "import sub\n"
relimp = "from . import sub\n"
deeprelimp = "from .... import sub\n"
futimp = "from __future__ import absolute_import\n"
reload_src = test_src+"""\
reloaded = True
"""
test_co = compile(test_src, "", "exec")
reload_co = compile(reload_src, "", "exec")
test2_oldabs_co = compile(absimp + test_src, "", "exec")
test2_newabs_co = compile(futimp + absimp + test_src, "", "exec")
test2_newrel_co = compile(relimp + test_src, "", "exec")
test2_deeprel_co = compile(deeprelimp + test_src, "", "exec")
test2_futrel_co = compile(futimp + relimp + test_src, "", "exec")
test_path = "!!!_test_!!!"
class ImportTracker:
"""Importer that only tracks attempted imports."""
def __init__(self):
self.imports = []
def find_module(self, fullname, path=None):
self.imports.append(fullname)
return None
class TestImporter:
modules = {
"hooktestmodule": (False, test_co),
"hooktestpackage": (True, test_co),
"hooktestpackage.sub": (True, test_co),
"hooktestpackage.sub.subber": (True, test_co),
"hooktestpackage.oldabs": (False, test2_oldabs_co),
"hooktestpackage.newabs": (False, test2_newabs_co),
"hooktestpackage.newrel": (False, test2_newrel_co),
"hooktestpackage.sub.subber.subest": (True, test2_deeprel_co),
"hooktestpackage.futrel": (False, test2_futrel_co),
"sub": (False, test_co),
"reloadmodule": (False, test_co),
}
def __init__(self, path=test_path):
if path != test_path:
# if out class is on sys.path_hooks, we must raise
# ImportError for any path item that we can't handle.
raise ImportError
self.path = path
def _get__path__(self):
raise NotImplementedError
def find_module(self, fullname, path=None):
if fullname in self.modules:
return self
else:
return None
def load_module(self, fullname):
ispkg, code = self.modules[fullname]
mod = sys.modules.setdefault(fullname,imp.new_module(fullname))
mod.__file__ = "<%s>" % self.__class__.__name__
mod.__loader__ = self
if ispkg:
mod.__path__ = self._get__path__()
exec code in mod.__dict__
return mod
class MetaImporter(TestImporter):
def _get__path__(self):
return []
class PathImporter(TestImporter):
def _get__path__(self):
return [self.path]
class ImportBlocker:
"""Place an ImportBlocker instance on sys.meta_path and you
can be sure the modules you specified can't be imported, even
if it's a builtin."""
def __init__(self, *namestoblock):
self.namestoblock = dict.fromkeys(namestoblock)
def find_module(self, fullname, path=None):
if fullname in self.namestoblock:
return self
return None
def load_module(self, fullname):
raise ImportError, "I dare you"
class ImpWrapper:
def __init__(self, path=None):
if path is not None and not os.path.isdir(path):
raise ImportError
self.path = path
def find_module(self, fullname, path=None):
subname = fullname.split(".")[-1]
if subname != fullname and self.path is None:
return None
if self.path is None:
path = None
else:
path = [self.path]
try:
file, filename, stuff = imp.find_module(subname, path)
except ImportError:
return None
return ImpLoader(file, filename, stuff)
class ImpLoader:
def __init__(self, file, filename, stuff):
self.file = file
self.filename = filename
self.stuff = stuff
def load_module(self, fullname):
mod = imp.load_module(fullname, self.file, self.filename, self.stuff)
if self.file:
self.file.close()
mod.__loader__ = self # for introspection
return mod
class ImportHooksBaseTestCase(unittest.TestCase):
def setUp(self):
self.path = sys.path[:]
self.meta_path = sys.meta_path[:]
self.path_hooks = sys.path_hooks[:]
sys.path_importer_cache.clear()
self.tracker = ImportTracker()
sys.meta_path.insert(0, self.tracker)
def tearDown(self):
sys.path[:] = self.path
sys.meta_path[:] = self.meta_path
sys.path_hooks[:] = self.path_hooks
sys.path_importer_cache.clear()
for fullname in self.tracker.imports:
if fullname in sys.modules:
del sys.modules[fullname]
class ImportHooksTestCase(ImportHooksBaseTestCase):
def doTestImports(self, importer=None):
import hooktestmodule
import hooktestpackage
import hooktestpackage.sub
import hooktestpackage.sub.subber
self.assertEqual(hooktestmodule.get_name(),
"hooktestmodule")
self.assertEqual(hooktestpackage.get_name(),
"hooktestpackage")
self.assertEqual(hooktestpackage.sub.get_name(),
"hooktestpackage.sub")
self.assertEqual(hooktestpackage.sub.subber.get_name(),
"hooktestpackage.sub.subber")
if importer:
self.assertEqual(hooktestmodule.__loader__, importer)
self.assertEqual(hooktestpackage.__loader__, importer)
self.assertEqual(hooktestpackage.sub.__loader__, importer)
self.assertEqual(hooktestpackage.sub.subber.__loader__, importer)
TestImporter.modules['reloadmodule'] = (False, test_co)
import reloadmodule
self.failIf(hasattr(reloadmodule,'reloaded'))
TestImporter.modules['reloadmodule'] = (False, reload_co)
reload(reloadmodule)
self.failUnless(hasattr(reloadmodule,'reloaded'))
import hooktestpackage.oldabs
self.assertEqual(hooktestpackage.oldabs.get_name(),
"hooktestpackage.oldabs")
self.assertEqual(hooktestpackage.oldabs.sub,
hooktestpackage.sub)
import hooktestpackage.newrel
self.assertEqual(hooktestpackage.newrel.get_name(),
"hooktestpackage.newrel")
self.assertEqual(hooktestpackage.newrel.sub,
hooktestpackage.sub)
import hooktestpackage.sub.subber.subest as subest
self.assertEqual(subest.get_name(),
"hooktestpackage.sub.subber.subest")
self.assertEqual(subest.sub,
hooktestpackage.sub)
import hooktestpackage.futrel
self.assertEqual(hooktestpackage.futrel.get_name(),
"hooktestpackage.futrel")
self.assertEqual(hooktestpackage.futrel.sub,
hooktestpackage.sub)
import sub
self.assertEqual(sub.get_name(), "sub")
import hooktestpackage.newabs
self.assertEqual(hooktestpackage.newabs.get_name(),
"hooktestpackage.newabs")
self.assertEqual(hooktestpackage.newabs.sub, sub)
def testMetaPath(self):
i = MetaImporter()
sys.meta_path.append(i)
self.doTestImports(i)
def testPathHook(self):
sys.path_hooks.append(PathImporter)
sys.path.append(test_path)
self.doTestImports()
def testBlocker(self):
mname = "exceptions" # an arbitrary harmless builtin module
if mname in sys.modules:
del sys.modules[mname]
sys.meta_path.append(ImportBlocker(mname))
try:
__import__(mname)
except ImportError:
pass
else:
self.fail("'%s' was not supposed to be importable" % mname)
def testImpWrapper(self):
i = ImpWrapper()
sys.meta_path.append(i)
sys.path_hooks.append(ImpWrapper)
mnames = ("colorsys", "urlparse", "distutils.core", "compiler.misc")
for mname in mnames:
parent = mname.split(".")[0]
for n in sys.modules.keys():
if n.startswith(parent):
del sys.modules[n]
for mname in mnames:
m = __import__(mname, globals(), locals(), ["__dummy__"])
m.__loader__ # to make sure we actually handled the import
# Delete urllib from modules because urlparse was imported above.
# Without this hack, test_socket_ssl fails if run in this order:
# regrtest.py test_codecmaps_tw test_importhooks test_socket_ssl
try:
del sys.modules['urllib']
except KeyError:
pass
def test_main():
test_support.run_unittest(ImportHooksTestCase)
if __name__ == "__main__":
test_main()