// Copyright 2008, 2009 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.internal.antlr;

 import org.antlr.runtime.CharStream;

 import org.antlr.runtime.Lexer;

 import org.antlr.runtime.RecognizerSharedState;

 import org.antlr.runtime.RecognitionException;

 public abstract class BaseLexer extends Lexer

 {

     protected BaseLexer()

     {

     }

     protected BaseLexer(CharStream charStream,

                         RecognizerSharedState recognizerSharedState)

     {

         super(charStream, recognizerSharedState);

     }

     protected void stripLeadingPlus()

     {

         String text = getText();

         // For compatibility with Tapestry 5.0, we need to allow a sign of '+', which Long.parseLong()

         // doesn't accept. To keep things downstream simple, we eliminate the '+' here.

         if (text.startsWith("+"))

         {

             setText(text.substring(1));

         }

     }

     @Override

     public void reportError(RecognitionException e)

     {

         throw new RuntimeException(String.format("Unable to parse input at character position %d",

                                                  e.charPositionInLine + 1),

                                    e);

     }

 }