AntlrGlobalScopePartition.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.partitions.rules;

import org.deved.antlride.common.ui.text.partitions.rules.AntlrBlockPartition;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;

/**
 * grammar structure:
 * ( cmt:DOC_COMMENT )?
 * gr:grammarType gid:id SEMI
 * optionsSpec?
 * tokensSpec?
 * scopes?
 * (actions*)?
 * rules+
 * @author edgar
 *
 */
public class AntlrGlobalScopePartition extends AntlrBlockPartition {

  public AntlrGlobalScopePartition(IToken successToken) {
    super(successToken);
    addExclusionPattern("scope");
    addExclusionPattern("@");
  }

  @Override
  protected IToken doEvaluate(ICharacterScanner scanner) {
    consumeWord(scanner);
    String text = getTextReaded();
    if (text.equals("scope")) {
      consumeWS(scanner);
      consumeWord(scanner);
      text = getTextReaded();
      if (text.length() == 0) {
        //rule scope
        unread(scanner);
        return Token.UNDEFINED;
      }
      consumeWS(scanner);
      consumeOne(scanner);
      text = getTextReaded();
      // scope Name {
      if (text.equals("{")) {
        return doBlock(scanner);
      }
      unread(scanner, getTextLengthReaded());
      return fSuccessToken;
    }
    unread(scanner);
    return Token.UNDEFINED;
  }

}