maven2-plugins/myfaces-javascript-plugin/src/main/java/org/apache/myfaces/buildtools/maven2/plugin/javascript/obfuscator/filters/compression/WhitespaceHandler.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.myfaces.buildtools.maven2.plugin.javascript.obfuscator.filters.compression;

import org.apache.myfaces.buildtools.maven2.plugin.javascript.obfuscator.javascript15parser.AnnotatedToken;


public class WhitespaceHandler implements CompressionHandler
{
  public WhitespaceHandler()
  {
  }

  public void handle(AnnotatedToken token, AnnotatedToken prevToken)
  {
    AnnotatedToken specialToken = token.getSpecialToken();
    AnnotatedToken prevSpecialToken = token;
    boolean skipOne = (prevToken == null) ? false
                                          : (prevToken.isWSSensitive() ||
      token.isInfixWSSensitive());

    while (specialToken != null)
    {
      // remove whitespace. Keep one if the token is whitespace sensitive
      if (specialToken.isWhiteSpace())
      {
        if (skipOne)
        {
          skipOne = false;
          specialToken.image = " ";
          prevSpecialToken = specialToken;
          specialToken = specialToken.getSpecialToken();
        }
        else
        {
          prevSpecialToken.specialToken = specialToken.specialToken;
          specialToken = specialToken.getSpecialToken();
        }
      }
      else
      {
        prevSpecialToken = specialToken;
        specialToken = specialToken.getSpecialToken();
      }
    }
  }
}