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    
015    package org.apache.tapestry5.internal.antlr;
016    
017    import org.antlr.runtime.CharStream;
018    import org.antlr.runtime.Lexer;
019    import org.antlr.runtime.RecognizerSharedState;
020    import org.antlr.runtime.RecognitionException;
021    
022    public 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    }