CSSOffsetMapper.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.editor.css;

import com.aptana.ide.editor.css.lexing.CSSTokenTypes;
import com.aptana.ide.editors.unified.ChildOffsetMapper;
import com.aptana.ide.editors.unified.IParentOffsetMapper;
import com.aptana.ide.lexer.Lexeme;

/**
 */
public class CSSOffsetMapper extends ChildOffsetMapper
{

	/**
	 * @param parent
	 */
	public CSSOffsetMapper(IParentOffsetMapper parent)
	{
		super(parent);
	}

	/** We are "outside" or "between" rules */
	public static final String MODE_NORMAL = "MODE_NORMAL"; //$NON-NLS-1$

	/** We are "inside" a rule */
	public static final String MODE_INVOKING = "MODE_INVOKING"; //$NON-NLS-1$

	/**
	 * Returns the invocation mode (invoking, new, or normal).
	 * 
	 * @param offset
	 *            The index to check the mode at.
	 * @return Returns the invocation mode (invoking, new, or normal).
	 */
	public String getMode(int offset)
	{
		String mode = MODE_NORMAL;
		int pos = getCurrentLexemeIndex();

		// backtrack over lexemes until we find a unmatched : or ;
		boolean wasNewline = false;
		boolean finished = false;

		while (pos >= 0 && pos < getLexemeList().size())
		{
			if (finished)
			{
				break;
			}

			Lexeme curLexeme = getLexemeList().get(pos);
			if (wasNewline)
			{
				break;
			}
			if (curLexeme.isAfterEOL())
			{
				wasNewline = true;
			}

			switch (curLexeme.typeIndex)
			{
				case CSSTokenTypes.COLON: // this needs to be a
					// "statement" instead of end
					// line
					mode = MODE_INVOKING;
					finished = true;
					break;

				case CSSTokenTypes.SEMICOLON:
					mode = MODE_NORMAL;
					finished = true;
					break;
					
				default:
			}
			pos--;
		}

		return mode;
	}

}