001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.colorizer;
021    
022    import org.sonar.channel.CodeReader;
023    import org.sonar.channel.EndMatcher;
024    
025    /**
026     * Detect Java constant
027     */
028    public class JavaConstantTokenizer extends Tokenizer {
029    
030      private final String tagBefore;
031      private final String tagAfter;
032      private static final int DOT = '.';
033    
034      public JavaConstantTokenizer(String tagBefore, String tagAfter) {
035        this.tagBefore = tagBefore;
036        this.tagAfter = tagAfter;
037      }
038    
039      private boolean hasNextToken(CodeReader code) {
040        int lastChar = code.lastChar();
041        if (isJavaConstantStart(code.peek()) && !Character.isJavaIdentifierPart(lastChar) && !Character.isJavaIdentifierStart(lastChar)
042            && lastChar != DOT) {
043          String constant = code.peekTo(endTokenMatcher);
044          int nextCharAfterConstant = code.peek(constant.length() + 1)[constant.length()];
045          if (nextCharAfterConstant != 0 && Character.isJavaIdentifierPart(nextCharAfterConstant)) {
046            return false;
047          }
048          return true;
049        }
050        return false;
051      }
052    
053      @Override
054      public boolean consume(CodeReader code, HtmlCodeBuilder codeBuilder) {
055        if (hasNextToken(code)) {
056          codeBuilder.appendWithoutTransforming(tagBefore);
057          code.popTo(endTokenMatcher, codeBuilder);
058          codeBuilder.appendWithoutTransforming(tagAfter);
059          return true;
060        } else {
061          return false;
062        }
063      }
064    
065      private boolean isJavaConstantStart(int character) {
066        return Character.isUpperCase(character);
067      }
068    
069      private boolean isJavaConstantPart(int character) {
070        return Character.isUpperCase(character) || character == '_' || character == '-' || Character.isDigit(character);
071      }
072    
073      private EndMatcher endTokenMatcher = new EndMatcher() {
074    
075        public boolean match(int endFlag) {
076          return !isJavaConstantPart(endFlag);
077        }
078      };
079    
080    }