<?php

/*

 * 解释器模式：给定一种语言，定义它文法的一种表示，并定义一个解释器，该解释器利用该表示来解释语言中的句子

 *

 */

class Expression

{

	function interpreter($str)

	{

		return $str;

	}

}

class ExpressionNum extends Expression

{

	function interpreter($str)

	{

		switch($str)

		{

			case "0": return "零";

			case "1": return "一";

			case "2": return "二";

			case "3": return "三";

			case "4": return "四";

			case "5": return "五";

			case "6": return "六";

			case "7": return "七";

			case "8": return "八";

			case "9": return "九";

		}

	}

}

class ExpressionCharater extends Expression

{

	function interpreter($str)

	{

		return strtoupper($str);

	}

}

class Interpreter

{

	function execute($string)

	{

		$expression = null;

		for($i = 0;$i<strlen($string);$i++) {

			$temp = $string[$i];

			switch(true)

			{

				case is_numeric($temp): $expression = new ExpressionNum(); break;

				default: $expression = new ExpressionCharater();

			}

			echo $expression->interpreter($temp);

		}

	}

}

$obj = new Interpreter();

$obj->execute("sdf12345abc");

?>