# This program 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 of the License, or (at your option) any later
# version.
#
# This program 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
# this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
# copyright 2003-2010 Sylvain Thenault, all rights reserved.
# contact mailto:thenault@gmail.com
#
# 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 import (ASTNGBuildingException, InferenceError,
                           NotFoundError)
from logilab.astng.bases import BaseClass

# /!\ We cannot build a StmtNode(NodeNG) class since modifying "__bases__"
# in "nodes.py" has to work *both* for old-style and new-style classes,
# but we need the StmtMixIn for scoped nodes

class StmtMixIn(BaseClass):
    """StmtMixIn used only for a adding a few attributes"""
    is_statement = True

    def replace(self, child, newchild):
        sequence = self.child_sequence(child)
        newchild.parent = self
        child.parent = None
        sequence[sequence.index(child)] = newchild

    def next_sibling(self):
        """return the next sibling statement"""
        stmts = self.parent.child_sequence(self)
        index = stmts.index(self)
        try:
            return stmts[index +1]
        except IndexError:
            pass

    def previous_sibling(self):
        """return the previous sibling statement"""
        stmts = self.parent.child_sequence(self)
        index = stmts.index(self)
        if index >= 1:
            return stmts[index -1]


class BlockRangeMixIn(BaseClass):
    """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(BaseClass, 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
        if mymodule.absolute_modname(modname, level) == mymodule.name:
            # FIXME: I don't know what to do here...
            raise InferenceError('module importing itself: %s' % modname)
        try:
            return mymodule.import_module(modname, level=level)
        except (ASTNGBuildingException, SyntaxError):
            raise InferenceError(modname)

    def real_name(self, asname):
        """get name from 'as' name"""
        for index in range(len(self.names)):
            name, _asname = self.names[index]
            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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