/*******************************************************************************
 * 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 org.eclipse.wst.jsdt.internal.compiler.lookup;

import org.eclipse.wst.jsdt.core.compiler.CharOperation;

public class SignatureWrapper {
	public char[] signature;
	public int start;
	public int end;
	public int bracket;

	public SignatureWrapper(char[] signature) {
		this.signature = signature;
		this.start = 0;
		this.end = this.bracket = -1;
	}
	public boolean atEnd() {
		return this.start < 0 || this.start >= this.signature.length;
	}
	public int computeEnd() {
		int index = this.start;
		while (this.signature[index] == '[')
			index++;
		switch (this.signature[index]) {
			case 'L' :
			case 'T' :
				this.end = CharOperation.indexOf(';', this.signature, this.start);
				if (this.bracket <= this.start) // already know it if its > start
					this.bracket = CharOperation.indexOf('<', this.signature, this.start);
		
				if (this.bracket > this.start && this.bracket < this.end)
					this.end = this.bracket;
				else if (this.end == -1)
					this.end = this.signature.length + 1;
				break;
			default :
				this.end = this.start;
		}

		this.start = this.end + 1; // skip ';'
		return this.end;
	}
	public char[] nextWord() {
		this.end = CharOperation.indexOf(';', this.signature, this.start);
		if (this.bracket <= this.start) // already know it if its > start
			this.bracket = CharOperation.indexOf('<', this.signature, this.start);
		int dot = CharOperation.indexOf('.', this.signature, this.start);

		if (this.bracket > this.start && this.bracket < this.end)
			this.end = this.bracket;
		if (dot > this.start && dot < this.end)
			this.end = dot;

		return CharOperation.subarray(this.signature, this.start, this.start = this.end); // skip word
	}
	public String toString() {
		return new String(this.signature) + " @ " + this.start; //$NON-NLS-1$
	}
}
