001// Copyright 2008, 2009 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.beanmodel.internal.antlr;
016
017import org.antlr.runtime.CharStream;
018import org.antlr.runtime.Lexer;
019import org.antlr.runtime.RecognizerSharedState;
020import org.antlr.runtime.RecognitionException;
021
022public abstract class BaseLexer extends Lexer
023{
024    protected BaseLexer()
025    {
026    }
027
028    protected BaseLexer(CharStream charStream,
029                        RecognizerSharedState recognizerSharedState)
030    {
031        super(charStream, recognizerSharedState);
032    }
033
034    protected void stripLeadingPlus()
035    {
036        String text = getText();
037
038        // For compatibility with Tapestry 5.0, we need to allow a sign of '+', which Long.parseLong()
039        // doesn't accept. To keep things downstream simple, we eliminate the '+' here.
040
041        if (text.startsWith("+"))
042        {
043            setText(text.substring(1));
044        }
045    }
046
047    @Override
048    public void reportError(RecognitionException e)
049    {
050        throw new RuntimeException(String.format("Unable to parse input at character position %d",
051                                                 e.charPositionInLine + 1),
052                                   e);
053    }
054}