IdentifierMatcher.java

/**
 * 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.lexer.matcher;

import java.util.Arrays;

/**
 * @author Kevin Lindsey
 */
public class IdentifierMatcher extends AbstractTextMatcher
{
	private static final char[] NO_CHARACTERS = new char[0];
	
	private char[] _startCharacters;
	private char[] _partCharacters;
	
	/**
	 * IdentifierMatcher
	 */
	public IdentifierMatcher()
	{
		this._startCharacters = NO_CHARACTERS;
		this._partCharacters = NO_CHARACTERS;
	}

	/**
	 * @see com.aptana.ide.lexer.matcher.AbstractTextMatcher#addChildTypes()
	 */
	public void addChildTypes()
	{
		// no children
	}
	
	/**
	 * @see com.aptana.ide.lexer.matcher.AbstractTextMatcher#addFirstCharacters(com.aptana.ide.lexer.matcher.MatcherMap, com.aptana.ide.lexer.matcher.ITextMatcher)
	 */
	public void addFirstCharacters(MatcherMap map, ITextMatcher target)
	{
		if (this._startCharacters != null)
		{
			for (int i = 0; i < this._startCharacters.length; i++)
			{
				map.addCharacterMatcher(this._startCharacters[i], target);
			}
		}
		
		map.addLetterMatcher(target);
	}

	/**
	 * @see com.aptana.ide.lexer.matcher.AbstractTextMatcher#match(char[], int, int)
	 */
	public int match(char[] source, int offset, int eofset)
	{
		int result = offset;

		if (result < eofset)
		{
			char c = source[result];
			
			if (Character.isLetter(c) || Arrays.binarySearch(this._startCharacters, c) >= 0)
			{
				// advance
				result++;
				
				while (result < eofset)
				{
					// get current character
					c = source[result];
				
					if (Character.isLetterOrDigit(c) || Arrays.binarySearch(this._partCharacters, c) >= 0)
					{
						// advance
						result++;
					}
					else
					{
						break;
					}
				}
			}
		}

		if (result != offset)
		{
			this.accept(source, offset, result, this.token);
		}
		else
		{
			result = -1;
		}

		return result;
	}

	/**
	 * setPartCharacters
	 *
	 * @param partCharacters
	 */
	public void setPartCharacters(String partCharacters)
	{
		if (partCharacters == null || partCharacters.length() == 0)
		{
			this._partCharacters = NO_CHARACTERS;
		}
		else
		{
			this._partCharacters = partCharacters.toCharArray();
			
			Arrays.sort(this._partCharacters);
		}
	}

	/**
	 * setStartCharacters
	 *
	 * @param startCharacters
	 */
	public void setStartCharacters(String startCharacters)
	{
		if (startCharacters == null || startCharacters.length() == 0)
		{
			this._startCharacters = NO_CHARACTERS;
		}
		else
		{
			this._startCharacters = startCharacters.toCharArray();
			
			Arrays.sort(this._startCharacters);
		}
	}
}