/*
 * Copyright (C)2005-2018 Haxe Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

package lua.internal;
import lua.lib.luautf8.Utf8;

/**
  An implementation for some of the string logic
**/
class StringImpl {
	static public function indexOf( _this : String, str : String, ?startIndex : Int ) : Int {
		if (startIndex == null) startIndex = 0;
		if (str == "") {
			if (_this == ""){
				return 0;
			} else {
				var max = cast Math.max(startIndex,0);
				return cast Math.min(_this.length, max);
			}
		} else {
			var startIndex = startIndex >= 0 ? startIndex + 1 : startIndex;
			var r = Utf8.find(_this, str, startIndex, true).begin;
			if (r != null && r > 0) return r-1;
			else return -1;
		}
	}
}