AntlrGrammarActionHighlight.java

/*******************************************************************************
 * Copyright (c) 2007, 2008 Edgar Espina.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 
 *******************************************************************************/
package org.deved.antlride.internal.ui.text.highlighting.rules;

import org.deved.antlride.core.AntlrLanguageTargetName;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;

public class AntlrGrammarActionHighlight extends AntlrAbstractHighlight {
  private IToken fInvalidActionToken;

  public AntlrGrammarActionHighlight(IToken actionToken,
      IToken invalidActionToken) {
    super(actionToken);
    fInvalidActionToken = invalidActionToken;
  }

  protected IToken doEvaluate(ICharacterScanner scanner) {
    consumeOne(scanner);
    String text = getTextReaded();
    if (text.equals("@")) {
      boolean hasScope = false;
      consumeWS(scanner);
      consumeWord(scanner);// action-scope | action-name
      text = getTextReaded();
      if (text.equals("lexer") || text.equals("parser")
          || text.equals("treeparser")) {
        hasScope = true;
      }
      if (hasScope) {
        consumeWS(scanner);
        consumeOne(scanner);// :
        consumeWS(scanner);
        consumeOne(scanner);// :
        consumeWS(scanner);
        consumeWord(scanner);// action-name
        text = getTextReaded();
      }
      if (text.equals("header") || text.equals("members")
          || text.equals("rulecatch") || text.equals("synpredgate")) {
        return fSuccessToken;
      }
      String language = getGrammarOption(scanner, "language", "");
      if(AntlrLanguageTargetName.ActionScript.name().equals(language)) {
    	  if(text.equals("package")) {
    		  return fSuccessToken;
    	  }
      }
      return fInvalidActionToken;
    }
    unread(scanner);
    return Token.UNDEFINED;
  }
}