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−#!/usr/bin/env python
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−#
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−# Copyright 2007 Google Inc.
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−#
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−# Licensed under the Apache License, Version 2.0 (the "License");
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−# you may not use this file except in compliance with the License.
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−# You may obtain a copy of the License at
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−#
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−#     http://www.apache.org/licenses/LICENSE-2.0
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−#
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−# Unless required by applicable law or agreed to in writing, software
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−# distributed under the License is distributed on an "AS IS" BASIS,
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−# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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−# See the License for the specific language governing permissions and
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−# limitations under the License.
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−#
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−
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−
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−"""A wrapper around the generated Groc parser and lexer."""
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−
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−
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−import google
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−
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−import antlr3
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−
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−import GrocLexer
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−import GrocParser
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−
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−
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−class GrocException(Exception):
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−  """An error occurred while parsing the groc input string."""
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−
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−
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−class GrocLexerWithErrors(GrocLexer.GrocLexer):
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−  """An overridden Lexer that raises exceptions."""
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−
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−  def emitErrorMessage(self, msg):
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−    """Raise an exception if the input fails to parse correctly.
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−
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−    Overriding the default, which normally just prints a message to
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−    stderr.
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−
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−    Arguments:
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−      msg: the error message
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−    Raises:
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−      GrocException: always.
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−    """
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−    raise GrocException(msg)
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−
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−
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−class GrocParserWithErrors(GrocParser.GrocParser):
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−  """An overridden Parser that raises exceptions."""
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−
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−  def emitErrorMessage(self, msg):
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−    """Raise an exception if the input fails to parse correctly.
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−
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−    Overriding the default, which normally just prints a message to
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−    stderr.
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−
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−    Arguments:
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−      msg: the error message
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−    Raises:
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−      GrocException: always.
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−    """
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−    raise GrocException(msg)
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−
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−
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−def CreateParser(parse_string):
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−  """Creates a Groc Parser."""
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−  input_string = antlr3.ANTLRStringStream(parse_string)
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−  lexer = GrocLexerWithErrors(input_string)
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−  tokens = antlr3.CommonTokenStream(lexer)
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−  parser = GrocParserWithErrors(tokens)
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−  return parser