79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
# Copyright 2005 Google LLC. All Rights Reserved.
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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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# WARNING: This file is externally viewable by our users. All comments from
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# this file will be stripped. The docstrings will NOT. Do not put sensitive
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# information in docstrings. If you must communicate internal information in
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# this source file, please place them in comments only.
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"""A wrapper around the generated Groc parser and lexer."""
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from __future__ import absolute_import
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from . import GrocLexer
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from . import GrocParser
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import antlr3
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__author__ = 'arb@google.com (Anthony Baxter)'
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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
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