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#!/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
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