    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    }