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。 .
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Current File : /home/akaindir/public_html/crm/modules/com_vtiger_workflow/expression_engine/VTTokenizer.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 VTExpressionToken{
	function __construct($label){
		$this->label = $label;
	}
}

function _vt_processtoken_id($token){
	return $token;
}

function _vt_processtoken_symbol($token){
	return new VTEXpressionSymbol($token);
}

class VTExpressionTokenizer{
	function __construct($expr){		
		$tokenTypes = array(
				"SPACE" => array('\s+', '_vt_processtoken_id'),
				"SYMBOL" => array('[a-zA-Z][\w]*|\(\w+ : \(\w+\) \w+\)', '_vt_processtoken_symbol'),
				"ESCAPED_SYMBOL" => array('?:`([^`]+)`', '_vt_processtoken_symbol'),
				//"STRING" => array('?:(?:"((?:\\\\"|[^"])+)"|'."'((?:\\\\'|[^'])+)')", 'stripcslashes'),
                //"STRING" => array('?:"((?:\\\\"|[^"])+)"', 'stripcslashes'),
                "STRING" => array("?:'((?:\\\\'|[^'])+)'", 'stripcslashes'),
				"FLOAT" => array('\d+[.]\d+', 'floatval'),
				"INTEGER" => array('\d+', 'intval'),
				'OPERATOR' => array('[+]|[-]|[*]|>=|<=|[<]|[>]|==|\/', '_vt_processtoken_symbol'),
				// NOTE: Any new Operator added should be updated in VTParser.inc::$precedence and operation at VTExpressionEvaluater				
				'OPEN_BRACKET' => array('[(]', '_vt_processtoken_symbol'),
				'CLOSE_BRACKET' => array('[)]', '_vt_processtoken_symbol'),
				'COMMA' => array('[,]', '_vt_processtoken_symbol')
		);
		$tokenReArr = array();
		$tokenNames = array();
		$this->tokenTypes = $tokenTypes;
			
		foreach($tokenTypes as $tokenName => $code){
			list($re, $processtoken) = $code;
			$tokenReArr[] = '('.$re.')';
			$tokenNames[] = $tokenName;
		}
		$this->tokenNames = $tokenNames;
		$tokenRe = '/'.implode('|', $tokenReArr).'/';
		$this->EOF = new VTExpressionToken("EOF");
			
		$matches = array();
		preg_match_all($tokenRe, $expr, $matches, PREG_SET_ORDER);
		$this->matches = $matches;
		$this->idx = 0;
	}
	function nextToken(){
		$matches = $this->matches;
		$idx = $this->idx;
		if($idx == sizeof($matches)){
			return $this->EOF;
		}else{
			$match = $matches[$idx];
			$this->idx = $idx + 1;
			$i=1;
			while($match[$i]==null){
				$i+=1;
			}
			$tokenName = $this->tokenNames[$i-1];
			$token = new VTExpressionToken($tokenName);
			$token->value = $this->tokenTypes[$tokenName][1]($match[$i]);
			return $token;
		}
	}
}

class VTExpressionSpaceFilter{
	function __construct($tokens){
		$this->tokens = $tokens;
	}

	function nextToken(){
		do{
			$token = $this->tokens->nextToken();
		}while($token->label == "SPACE");
		return $token;
	}
}


?>

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