/**
* This file Copyright (c) 2005-2008 Aptana, Inc. This program is
* dual-licensed under both the Aptana Public License and the GNU General
* Public license. You may elect to use one or the other of these licenses.
*
* This program is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. Redistribution, except as permitted by whichever of
* the GPL or APL you select, is prohibited.
*
* 1. For the GPL license (GPL), you can redistribute and/or modify this
* program under the terms of the GNU General Public License,
* Version 3, as published by the Free Software Foundation. You should
* have received a copy of the GNU General Public License, Version 3 along
* with this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Aptana provides a special exception to allow redistribution of this file
* with certain other free and open source software ("FOSS") code and certain additional terms
* pursuant to Section 7 of the GPL. You may view the exception and these
* terms on the web at http://www.aptana.com/legal/gpl/.
*
* 2. For the Aptana Public License (APL), this program and the
* accompanying materials are made available under the terms of the APL
* v1.0 which accompanies this distribution, and is available at
* http://www.aptana.com/legal/apl/.
*
* You may view the GPL, Aptana's exception and additional terms, and the
* APL in the file titled license.html at the root of the corresponding
* plugin containing this source file.
*
* Any modifications to this file must keep this entire header intact.
*/
package com.aptana.ide.parsing.matcher;
import com.aptana.ide.lexer.Lexeme;
/**
* @author Kevin Lindsey
*/
public class OptionalMatcher extends AbstractLexemeMatcher
{
/**
* OptionalMatcher
*/
public OptionalMatcher()
{
}
/**
* @see com.aptana.ide.parsing.matcher.AbstractLexemeMatcher#addChildTypes()
*/
public void addChildTypes()
{
this.addChildType(ILexemeMatcher.class);
this.addChildType(UseRuleMatcher.class);
}
/**
* @see com.aptana.ide.parsing.matcher.ILexemeMatcher#match(com.aptana.ide.lexer.Lexeme[], int, int)
*/
public int match(Lexeme[] lexemes, int offset, int eofOffset)
{
int result = offset;
ILexemeMatcher child = null;
this.reset();
if (this.getChildCount() > 0)
{
child = (ILexemeMatcher) this.getChild(0);
}
if (child != null)
{
result = child.match(lexemes, offset, eofOffset);
if (result == -1)
{
result = offset;
}
else
{
this.addChildParseNode(child.getParseResults());
}
}
if (result != -1)
{
this.accept(lexemes, offset, result);
}
return result;
}
}