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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //home/akaindir/www/crm/modules/com_vtiger_workflow/expression_engine/VTParser.inc

<?php
/*+*******************************************************************************
 * The contents of this file are subject to the vtiger CRM Public License Version 1.0
 * ("License"); You may not use this file except in compliance with the License
 * The Original Code is:  vtiger CRM Open Source
 * The Initial Developer of the Original Code is vtiger.
 * Portions created by vtiger are Copyright (C) vtiger.
 * All Rights Reserved.
 ******************************************************************************/
class VTExpressionTreeNode{
	function __construct($arr){
		$this->arr = $arr;
	}

	function getParams(){
		$arr = $this->arr;
		return array_slice($arr, 1, sizeof($arr)-1);
	}

	function getName(){
		return $this->arr[0];
	}
}


class VTExpressionSymbol{
	function __construct($value){
		$this->value = $value;
	}

	function __toString(){
		return "VTExpressionSymbol({$this->value})";
	}
}

class VTExpressionParser{
	function __construct($tokens){
		$this->tokens = $tokens;
		$this->tokenQueue = array();
	}

	function nextToken(){
		if(sizeof($this->tokenQueue)==0){
			return $this->tokens->nextToken();
		}else{
			return array_shift($this->tokenQueue);
		}
	}

	function la($n = 1){
		for($i=sizeof($this->tokenQueue); $i<$n; $i++){
			$token = $this->tokens->nextToken();
			$this->tokenQueue[] = $token;
		}
		return $this->tokenQueue[$n-1];
	}

	function consume($label, $value){
		$token=$this->nextToken();
		if($token->label!=$label || $token->value!=$value){
			throw new Exception("Was expecting a $label of value $value got a {$token->label} of {$token->value} instead.");
		}
	}

	function consumeSymbol($sym){
		$this->consume('SYMBOL', new VTExpressionSymbol($sym));
	}


	function check($token, $label, $value){
		return $token->label == $label && $token->value==$value;
	}

	function checkSymbol($token, $sym){
		return $this->check($token, 'SYMBOL', new VTExpressionSymbol($sym));
	}

	function atom(){
		$token = $this->nextToken();
		switch($token->label){
			case "STRING":
				return $token->value;
			case "INTEGER":
				return $token->value;
			case "FLOAT":
				return $token->value;
			case "SYMBOL":
				return $token->value;
			case "OPEN_BRACKET":
				$val = $this->expression();
				$close = $this->nextToken();
				if($close->label != 'CLOSE_BRACKET'){
					throw new Exception("Was expecting a close bracket");
				}
				return $val;
			default:
				throw new Exception();
		}
	}

	function ifCondition(){
		$this->consumeSymbol('if');
		$cond = $this->expression();
		$this->consumeSymbol('then');
		$ifTrue = $this->expression();
		$this->consumeSymbol('else');
		if($this->checkSymbol($this->la(), 'if')){
			$ifFalse = $this->ifCondition();
		}else{
			$ifFalse = $this->expression();
			$this->consumeSymbol('end');
		}
		return new VTExpressionTreeNode(array(new VTExpressionSymbol('if'), $cond, $ifTrue, $ifFalse));
	}

	function expression(){
		$la1 = $this->la(1);
		$la2 = $this->la(2);
		if($this->checkSymbol($la1, 'if')){
			return $this->ifCondition();
		}else if($la1->label=='SYMBOL' && $la2->label=='OPEN_BRACKET'){
			$arr = array($this->nextToken()->value);
			$this->nextToken();
			if($this->la()->label != 'CLOSE_BRACKET'){
				$arr[] = $this->expression();
				$comma = $this->nextToken();
				while($comma->label == 'COMMA'){
					$arr[] = $this->expression();
					$comma = $this->nextToken();
				}
				if($comma->label != 'CLOSE_BRACKET'){
					throw new Exception("Was expecting a closing bracket");
				}
			}else{
				$this->consume('CLOSE_BRACKET', new Symbol(')'));
			}
			return new VTExpressionTreeNode($arr);
		}else{
			return $this->binOp();
		}
	}

	var $precedence = array(
		array('*', '/'),
		array('+', '-'),
		array('and', 'or'),
		array('==', '>=', '<=', '>', '<')		
	);

	function binOp(){
		return $this->binOpPrec(sizeof($this->precedence)-1);
	}

	private function binOpPrec($prec){
		if($prec>=0){
			$lhs = $this->binOpPrec($prec-1);
			$la = $this->la();
			if($la->label == 'OPERATOR' && in_array($la->value->value, $this->precedence[$prec])){
				$operator = $this->nextToken()->value;
				$rhs = $this->binOpPrec($prec);
				return new VTExpressionTreeNode(array($operator, $lhs, $rhs));
			}else{
				return $lhs;
			}
		}else{
			return $this->unaryOp();
		}
	}

	function unaryOp(){
		$la = $this->la();
		if($la->label=="OPERATOR" && in_array($la->value->value, array('+', '-'))){
			$token = $this->nextToken();
			$operator = $la->value;
			$operand = $this->unaryOp();
			return new VTExpressionTreeNode(array($operator, $operand));
		}else{
			return $this->atom();
		}
	}
}
?>

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