/**********************************************************************
Copyright (c) 2000, 2004 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
	IBM Corporation - Initial implementation
**********************************************************************/

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

import org.eclipse.ant.internal.ui.model.AntUIPlugin;
import org.eclipse.ant.internal.ui.model.ColorManager;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.StringConverter;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.RuleBasedScanner;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;

public abstract class AbstractAntEditorScanner extends RuleBasedScanner {

	protected void adaptToColorChange(PropertyChangeEvent event, Token token) {
		RGB rgb= null;
		
		Object value= event.getNewValue();
		if (value instanceof RGB) {
			rgb= (RGB) value;
		} else if (value instanceof String) {
			rgb= StringConverter.asRGB((String) value);
		}
			
		if (rgb != null) {
			TextAttribute attr= (TextAttribute) token.getData();
			token.setData(new TextAttribute(ColorManager.getDefault().getColor(rgb), attr.getBackground(), attr.getStyle()));
		}
	}

	protected void adaptToStyleChange(PropertyChangeEvent event, Token token, int styleAttribute) {
	 	if (token == null) {
			return;
		}
		boolean eventValue= false;
		Object value= event.getNewValue();
		if (value instanceof Boolean) {
			eventValue= ((Boolean) value).booleanValue();
		} else if (IPreferenceStore.TRUE.equals(value)) {
			eventValue= true;
		}
		
		TextAttribute attr= (TextAttribute) token.getData();
		boolean activeValue= (attr.getStyle() & styleAttribute) == styleAttribute;
		if (activeValue != eventValue) { 
			token.setData(new TextAttribute(attr.getForeground(), attr.getBackground(), eventValue ? attr.getStyle() | styleAttribute : attr.getStyle() & ~styleAttribute));
		}
	}

	protected TextAttribute createTextAttribute(String colorID, String boldKey, String italicKey) {
		Color color= null;
		if (colorID != null) {
			color= AntUIPlugin.getPreferenceColor(colorID);
		}
		IPreferenceStore store= AntUIPlugin.getDefault().getPreferenceStore();
		int style= store.getBoolean(boldKey) ? SWT.BOLD : SWT.NORMAL;
		if (store.getBoolean(italicKey)) {
			style |= SWT.ITALIC;
		}
		
		return new TextAttribute(color, null, style);
	}
}