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# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# 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/>.
"""This module contains some mixins for the different nodes.
"""
from logilab.astng.exceptions import (ASTNGBuildingException, InferenceError,
NotFoundError)
class BlockRangeMixIn(object):
"""override block range """
def set_line_info(self, lastchild):
self.fromlineno = self.lineno
self.tolineno = lastchild.tolineno
self.blockstart_tolineno = self._blockstart_toline()
def _elsed_block_range(self, lineno, orelse, last=None):
"""handle block line numbers range for try/finally, for, if and while
statements
"""
if lineno == self.fromlineno:
return lineno, lineno
if orelse:
if lineno >= orelse[0].fromlineno:
return lineno, orelse[-1].tolineno
return lineno, orelse[0].fromlineno - 1
return lineno, last or self.tolineno
class FilterStmtsMixin(object):
"""Mixin for statement filtering and assignment type"""
def _get_filtered_stmts(self, _, node, _stmts, mystmt):
"""method used in _filter_stmts to get statemtents and trigger break"""
if self.statement() is mystmt:
# original node's statement is the assignment, only keep
# current node (gen exp, list comp)
return [node], True
return _stmts, False
def ass_type(self):
return self
class AssignTypeMixin(object):
def ass_type(self):
return self
def _get_filtered_stmts(self, lookup_node, node, _stmts, mystmt):
"""method used in filter_stmts"""
if self is mystmt:
return _stmts, True
if self.statement() is mystmt:
# original node's statement is the assignment, only keep
# current node (gen exp, list comp)
return [node], True
return _stmts, False
class ParentAssignTypeMixin(AssignTypeMixin):
def ass_type(self):
return self.parent.ass_type()
class FromImportMixIn(FilterStmtsMixin):
"""MixIn for From and Import Nodes"""
def _infer_name(self, frame, name):
return name
def do_import_module(self, modname):
"""return the ast for a module whose name is <modname> imported by <self>
"""
# handle special case where we are on a package node importing a module
# using the same name as the package, which may end in an infinite loop
# on relative imports
# XXX: no more needed ?
mymodule = self.root()
level = getattr(self, 'level', None) # Import as no level
# XXX we should investigate deeper if we really want to check
# importing itself: modname and mymodule.name be relative or absolute
if mymodule.relative_to_absolute_name(modname, level) == mymodule.name:
# FIXME: we used to raise InferenceError here, but why ?
return mymodule
try:
return mymodule.import_module(modname, level=level)
except ASTNGBuildingException:
raise InferenceError(modname)
except SyntaxError, ex:
raise InferenceError(str(ex))
def real_name(self, asname):
"""get name from 'as' name"""
for name, _asname in self.names:
if name == '*':
return asname
if not _asname:
name = name.split('.', 1)[0]
_asname = name
if asname == _asname:
return name
raise NotFoundError(asname)
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