/*******************************************************************************
 * Copyright (c) 2009 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *     Zend Technologies
 *******************************************************************************/
package org.eclipse.php.internal.core.codeassist.contexts;

import org.eclipse.dltk.core.*;

/**
 * This context represents the state when staying in a function parameter
 * variable. <br/>
 * Examples:
 * 
 * <pre>
 *  1. function foo($a|) {}
 *  2. function foo($|) {}
 * </pre>
 * 
 * @author michael
 */
public class FunctionParameterTypeContext extends FunctionParameterContext {
	private IMethod enclosingMethod;
	private IType enclosingType;

	public boolean isValid(ISourceModule sourceModule, int offset, CompletionRequestor requestor) {
		if (!super.isValid(sourceModule, offset, requestor)) {
			return false;
		}

		char triggerChar = getTriggerChar();
		if (triggerChar == '(' || triggerChar == ',') {
			// check whether enclosing element is a method
			IModelElement enclosingElement = getEnclosingElement();
			while (enclosingElement instanceof IField) {
				enclosingElement = enclosingElement.getParent();
			}
			if (!(enclosingElement instanceof IMethod)) {
				return false;
			}
			enclosingElement = enclosingMethod = (IMethod) enclosingElement;

			// find the most outer enclosing type if exists
			while (enclosingElement != null && !(enclosingElement instanceof IType)) {
				enclosingElement = enclosingElement.getParent();
			}
			enclosingType = (IType) enclosingElement;

			return true;
		} else {
			return false;
		}
	}

	public IMethod getEnclosingMethod() {
		return enclosingMethod;
	}

	public IType getEnclosingType() {
		return enclosingType;
	}
}