thirdparty/google_appengine/google/appengine/cron/groc.py
author Sverre Rabbelier <srabbelier@gmail.com>
Thu, 02 Apr 2009 23:05:31 +0000
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permissions -rwxr-xr-x
Print how many entities have been retrieved Patch by: Sverre Rabbelier
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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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"""A wrapper around the generated Groc parser and lexer."""
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import google
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import antlr3
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import GrocLexer
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import GrocParser
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class GrocException(Exception):
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  """An error occurred while parsing the groc input string."""
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class GrocLexerWithErrors(GrocLexer.GrocLexer):
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  """An overridden Lexer that raises exceptions."""
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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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    Overriding the default, which normally just prints a message to
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    stderr.
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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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class GrocParserWithErrors(GrocParser.GrocParser):
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  """An overridden Parser that raises exceptions."""
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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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    Overriding the default, which normally just prints a message to
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    stderr.
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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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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