/*******************************************************************************
 * Copyright (c) 2002, 2005 GEBIT Gesellschaft fuer EDV-Beratung
 * und Informatik-Technologien mbH, 
 * Berlin, Duesseldorf, Frankfurt (Germany) and others.
 * 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
 * 
 * Contributors:
 *     GEBIT Gesellschaft fuer EDV-Beratung und Informatik-Technologien mbH - initial API and implementation
 * 	   IBM Corporation - bug 31796, bug 24108, bug 47139
 *******************************************************************************/

package org.eclipse.ant.internal.ui.editor.text;

import org.eclipse.ant.internal.ui.preferences.AntEditorPreferenceConstants;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.MultiLineRule;
import org.eclipse.jface.text.rules.SingleLineRule;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.text.rules.WhitespaceRule;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;

/**
 * The scanner to tokenize for strings and tags
 */
public class AntEditorTagScanner extends AbstractAntEditorScanner {

	private Token fStringToken;

	public AntEditorTagScanner() {
		fStringToken = new Token(createTextAttribute(IAntEditorColorConstants.STRING_COLOR, IAntEditorColorConstants.STRING_COLOR
				+ AntEditorPreferenceConstants.EDITOR_BOLD_SUFFIX, IAntEditorColorConstants.STRING_COLOR
				+ AntEditorPreferenceConstants.EDITOR_ITALIC_SUFFIX));

		IRule[] rules = new IRule[3];

		// Add rule for single and double quotes
		rules[0] = new MultiLineRule("\"", "\"", fStringToken, '\\'); //$NON-NLS-1$ //$NON-NLS-2$
		rules[1] = new SingleLineRule("'", "'", fStringToken, '\\'); //$NON-NLS-1$ //$NON-NLS-2$

		// Add generic whitespace rule.
		rules[2] = new WhitespaceRule(new AntEditorWhitespaceDetector());

		setRules(rules);

		setDefaultReturnToken(new Token(createTextAttribute(IAntEditorColorConstants.TAG_COLOR, IAntEditorColorConstants.TAG_COLOR
				+ AntEditorPreferenceConstants.EDITOR_BOLD_SUFFIX, IAntEditorColorConstants.TAG_COLOR
				+ AntEditorPreferenceConstants.EDITOR_ITALIC_SUFFIX)));
	}

	public void adaptToPreferenceChange(PropertyChangeEvent event) {
		String property = event.getProperty();
		if (property.startsWith(IAntEditorColorConstants.TAG_COLOR) || property.startsWith(IAntEditorColorConstants.STRING_COLOR)) {
			if (property.endsWith(AntEditorPreferenceConstants.EDITOR_BOLD_SUFFIX)) {
				adaptToStyleChange(event, getTokenAffected(event), SWT.BOLD);
			} else if (property.endsWith(AntEditorPreferenceConstants.EDITOR_ITALIC_SUFFIX)) {
				adaptToStyleChange(event, getTokenAffected(event), SWT.ITALIC);
			} else {
				adaptToColorChange(event, getTokenAffected(event));
			}
		}
	}

	private Token getTokenAffected(PropertyChangeEvent event) {
		String property = event.getProperty();
		if (property.startsWith(IAntEditorColorConstants.STRING_COLOR)) {
			return fStringToken;
		}// else if (property.startsWith(IAntEditorColorConstants.TAG_COLOR)) {
		return (Token) fDefaultReturnToken;
		// }
	}
}