/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation 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 API and implementation
 *******************************************************************************/
package net.sourceforge.phpeclipse.js.ui.internal.text;

import net.sourceforge.phpeclipse.ui.WebUI;
import net.sourceforge.phpeclipse.ui.templates.template.BasicCompletionProcessor;
import net.sourceforge.phpeclipse.ui.templates.template.JSContextType;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.templates.TemplateContextType;


/**
 * A completion processor for XML templates.
 */
public class JSCompletionProcessor extends BasicCompletionProcessor {
  /**
	 * We watch for angular brackets since those are often part of XML
	 * templates.
	 */
	protected String extractPrefix(ITextViewer viewer, int offset) {
		IDocument document= viewer.getDocument();
		int i= offset;
		if (i > document.getLength())
			return ""; //$NON-NLS-1$
		
		try {
			while (i > 0) {
				char ch= document.getChar(i - 1);
				if (!Character.isJavaIdentifierPart(ch))
					break;
				i--;
			}
	
			return document.get(i, offset - i);
		} catch (BadLocationException e) {
			return ""; //$NON-NLS-1$
		}
	}
	/**
	 * Return the XML context type that is supported by this plugin. 
	 */
	protected TemplateContextType getContextType(ITextViewer viewer, IRegion region) {
		return WebUI.getDefault().getContextTypeRegistry().getContextType(JSContextType.JS_CONTEXT_TYPE);
	}

	
}