/usr/lib/python2.7/dist-packages/logilab/astng/manager.py is in python-logilab-astng 0.24.3-1ubuntu1.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-astng.
#
# logilab-astng is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 2.1 of the License, or (at your
# option) any later version.
#
# logilab-astng is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-astng. If not, see <http://www.gnu.org/licenses/>.
"""astng manager: avoid multiple astng build of a same module when
possible by providing a class responsible to get astng representation
from various source and using a cache of built modules)
"""
__docformat__ = "restructuredtext en"
import os
from os.path import dirname, join, isdir, exists
from logilab.common.modutils import NoSourceFile, is_python_source, \
file_from_modpath, load_module_from_name, modpath_from_file, \
get_module_files, get_source_file, zipimport
from logilab.common.configuration import OptionsProviderMixIn
from logilab.astng.exceptions import ASTNGBuildingException
def astng_wrapper(func, modname):
"""wrapper to give to ASTNGManager.project_from_files"""
print 'parsing %s...' % modname
try:
return func(modname)
except ASTNGBuildingException, exc:
print exc
except Exception, exc:
import traceback
traceback.print_exc()
def _silent_no_wrap(func, modname):
"""silent wrapper that doesn't do anything; can be used for tests"""
return func(modname)
def safe_repr(obj):
try:
return repr(obj)
except:
return '???'
class ASTNGManager(OptionsProviderMixIn):
"""the astng manager, responsible to build astng from files
or modules.
Use the Borg pattern.
"""
name = 'astng loader'
options = (("ignore",
{'type' : "csv", 'metavar' : "<file>",
'dest' : "black_list", "default" : ('CVS',),
'help' : "add <file> (may be a directory) to the black list\
. It should be a base name, not a path. You may set this option multiple times\
."}),
("project",
{'default': "No Name", 'type' : 'string', 'short': 'p',
'metavar' : '<project name>',
'help' : 'set the project name.'}),
)
brain = {}
def __init__(self):
self.__dict__ = ASTNGManager.brain
if not self.__dict__:
OptionsProviderMixIn.__init__(self)
self.load_defaults()
# NOTE: cache entries are added by the [re]builder
self.astng_cache = {}
self._mod_file_cache = {}
self.transformers = []
def astng_from_file(self, filepath, modname=None, fallback=True, source=False):
"""given a module name, return the astng object"""
try:
filepath = get_source_file(filepath, include_no_ext=True)
source = True
except NoSourceFile:
pass
if modname is None:
try:
modname = '.'.join(modpath_from_file(filepath))
except ImportError:
modname = filepath
if modname in self.astng_cache:
return self.astng_cache[modname]
if source:
from logilab.astng.builder import ASTNGBuilder
return ASTNGBuilder(self).file_build(filepath, modname)
elif fallback and modname:
return self.astng_from_module_name(modname)
raise ASTNGBuildingException('unable to get astng for file %s' %
filepath)
def astng_from_module_name(self, modname, context_file=None):
"""given a module name, return the astng object"""
if modname in self.astng_cache:
return self.astng_cache[modname]
if modname == '__main__':
from logilab.astng.builder import ASTNGBuilder
return ASTNGBuilder(self).string_build('', modname)
old_cwd = os.getcwd()
if context_file:
os.chdir(dirname(context_file))
try:
filepath = self.file_from_module_name(modname, context_file)
if filepath is not None and not is_python_source(filepath):
module = self.zip_import_data(filepath)
if module is not None:
return module
if filepath is None or not is_python_source(filepath):
try:
module = load_module_from_name(modname)
except Exception, ex:
msg = 'Unable to load module %s (%s)' % (modname, ex)
raise ASTNGBuildingException(msg)
return self.astng_from_module(module, modname)
return self.astng_from_file(filepath, modname, fallback=False)
finally:
os.chdir(old_cwd)
def zip_import_data(self, filepath):
if zipimport is None:
return None
from logilab.astng.builder import ASTNGBuilder
builder = ASTNGBuilder(self)
for ext in ('.zip', '.egg'):
try:
eggpath, resource = filepath.rsplit(ext + '/', 1)
except ValueError:
continue
try:
importer = zipimport.zipimporter(eggpath + ext)
zmodname = resource.replace('/', '.')
if importer.is_package(resource):
zmodname = zmodname + '.__init__'
module = builder.string_build(importer.get_source(resource),
zmodname, filepath)
return module
except:
continue
return None
def file_from_module_name(self, modname, contextfile):
try:
value = self._mod_file_cache[(modname, contextfile)]
except KeyError:
try:
value = file_from_modpath(modname.split('.'),
context_file=contextfile)
except ImportError, ex:
msg = 'Unable to load module %s (%s)' % (modname, ex)
value = ASTNGBuildingException(msg)
self._mod_file_cache[(modname, contextfile)] = value
if isinstance(value, ASTNGBuildingException):
raise value
return value
def astng_from_module(self, module, modname=None):
"""given an imported module, return the astng object"""
modname = modname or module.__name__
if modname in self.astng_cache:
return self.astng_cache[modname]
try:
# some builtin modules don't have __file__ attribute
filepath = module.__file__
if is_python_source(filepath):
return self.astng_from_file(filepath, modname)
except AttributeError:
pass
from logilab.astng.builder import ASTNGBuilder
return ASTNGBuilder(self).module_build(module, modname)
def astng_from_class(self, klass, modname=None):
"""get astng for the given class"""
if modname is None:
try:
modname = klass.__module__
except AttributeError:
raise ASTNGBuildingException(
'Unable to get module for class %s' % safe_repr(klass))
modastng = self.astng_from_module_name(modname)
return modastng.getattr(klass.__name__)[0] # XXX
def infer_astng_from_something(self, obj, context=None):
"""infer astng for the given class"""
if hasattr(obj, '__class__') and not isinstance(obj, type):
klass = obj.__class__
else:
klass = obj
try:
modname = klass.__module__
except AttributeError:
raise ASTNGBuildingException(
'Unable to get module for %s' % safe_repr(klass))
except Exception, ex:
raise ASTNGBuildingException(
'Unexpected error while retrieving module for %s: %s'
% (safe_repr(klass), ex))
try:
name = klass.__name__
except AttributeError:
raise ASTNGBuildingException(
'Unable to get name for %s' % safe_repr(klass))
except Exception, ex:
raise ASTNGBuildingException(
'Unexpected error while retrieving name for %s: %s'
% (safe_repr(klass), ex))
# take care, on living object __module__ is regularly wrong :(
modastng = self.astng_from_module_name(modname)
if klass is obj:
for infered in modastng.igetattr(name, context):
yield infered
else:
for infered in modastng.igetattr(name, context):
yield infered.instanciate_class()
def project_from_files(self, files, func_wrapper=astng_wrapper,
project_name=None, black_list=None):
"""return a Project from a list of files or modules"""
# build the project representation
project_name = project_name or self.config.project
black_list = black_list or self.config.black_list
project = Project(project_name)
for something in files:
if not exists(something):
fpath = file_from_modpath(something.split('.'))
elif isdir(something):
fpath = join(something, '__init__.py')
else:
fpath = something
astng = func_wrapper(self.astng_from_file, fpath)
if astng is None:
continue
# XXX why is first file defining the project.path ?
project.path = project.path or astng.file
project.add_module(astng)
base_name = astng.name
# recurse in package except if __init__ was explicitly given
if astng.package and something.find('__init__') == -1:
# recurse on others packages / modules if this is a package
for fpath in get_module_files(dirname(astng.file),
black_list):
astng = func_wrapper(self.astng_from_file, fpath)
if astng is None or astng.name == base_name:
continue
project.add_module(astng)
return project
def register_transformer(self, transformer):
self.transformers.append(transformer)
class Project:
"""a project handle a set of modules / packages"""
def __init__(self, name=''):
self.name = name
self.path = None
self.modules = []
self.locals = {}
self.__getitem__ = self.locals.__getitem__
self.__iter__ = self.locals.__iter__
self.values = self.locals.values
self.keys = self.locals.keys
self.items = self.locals.items
def add_module(self, node):
self.locals[node.name] = node
self.modules.append(node)
def get_module(self, name):
return self.locals[name]
def get_children(self):
return self.modules
def __repr__(self):
return '<Project %r at %s (%s modules)>' % (self.name, id(self),
len(self.modules))
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