Extend taggable-mixin to support different Tag models.
Usage is pretty simple. Tag model is default in Taggable constructor but you
can call it with different model like GHOPTaskType that inherits from Tag model.
Both Taggable and Tag models have been updated and they don't use hardcoded Tag
model anymore and instead use cls of class methods or self.__class__. In case
of Taggable it's self.__tag_model.
#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""A wrapper around the generated Groc parser and lexer."""
import google
import antlr3
import GrocLexer
import GrocParser
class GrocException(Exception):
"""An error occurred while parsing the groc input string."""
class GrocLexerWithErrors(GrocLexer.GrocLexer):
"""An overridden Lexer that raises exceptions."""
def emitErrorMessage(self, msg):
"""Raise an exception if the input fails to parse correctly.
Overriding the default, which normally just prints a message to
stderr.
Arguments:
msg: the error message
Raises:
GrocException: always.
"""
raise GrocException(msg)
class GrocParserWithErrors(GrocParser.GrocParser):
"""An overridden Parser that raises exceptions."""
def emitErrorMessage(self, msg):
"""Raise an exception if the input fails to parse correctly.
Overriding the default, which normally just prints a message to
stderr.
Arguments:
msg: the error message
Raises:
GrocException: always.
"""
raise GrocException(msg)
def CreateParser(parse_string):
"""Creates a Groc Parser."""
input_string = antlr3.ANTLRStringStream(parse_string)
lexer = GrocLexerWithErrors(input_string)
tokens = antlr3.CommonTokenStream(lexer)
parser = GrocParserWithErrors(tokens)
return parser