AntlrTreeOperatorHighlight.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.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;

public class AntlrTreeOperatorHighlight extends AntlrAbstractHighlight {

  public AntlrTreeOperatorHighlight(IToken successToken) {
    super(successToken);
  }

  @Override
  protected IToken doEvaluate(ICharacterScanner scanner) {
    consumeOne(scanner);
    String text = getTextReaded();
    if(text.equals("^") || text.equals("!")) {
      return fSuccessToken;
    }
    unread(scanner);
    return Token.UNDEFINED;
  }

}