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   1  <?php
   2  /*+*******************************************************************************
   3   * The contents of this file are subject to the vtiger CRM Public License Version 1.0
   4   * ("License"); You may not use this file except in compliance with the License
   5   * The Original Code is:  vtiger CRM Open Source
   6   * The Initial Developer of the Original Code is vtiger.
   7   * Portions created by vtiger are Copyright (C) vtiger.
   8   * All Rights Reserved.
   9   ******************************************************************************/
  10  class VTExpressionToken{
  11  	function __construct($label){
  12          $this->label = $label;
  13      }
  14  }
  15  
  16  function _vt_processtoken_id($token){
  17      return $token;
  18  }
  19  
  20  function _vt_processtoken_symbol($token){
  21      return new VTEXpressionSymbol($token);
  22  }
  23  
  24  class VTExpressionTokenizer{
  25  	function __construct($expr){        
  26          $tokenTypes = array(
  27                  "SPACE" => array('\s+', '_vt_processtoken_id'),
  28                  "SYMBOL" => array('[a-zA-Z][\w]*', '_vt_processtoken_symbol'),
  29                  "ESCAPED_SYMBOL" => array('?:`([^`]+)`', '_vt_processtoken_symbol'),
  30                  //"STRING" => array('?:(?:"((?:\\\\"|[^"])+)"|'."'((?:\\\\'|[^'])+)')", 'stripcslashes'),
  31                  //"STRING" => array('?:"((?:\\\\"|[^"])+)"', 'stripcslashes'),
  32                  "STRING" => array("?:'((?:\\\\'|[^'])+)'", 'stripcslashes'),
  33                  "FLOAT" => array('\d+[.]\d+', 'floatval'),
  34                  "INTEGER" => array('\d+', 'intval'),
  35                  'OPERATOR' => array('[+]|[-]|[*]|>=|<=|[<]|[>]|==|\/', '_vt_processtoken_symbol'),
  36                  // NOTE: Any new Operator added should be updated in VTParser.inc::$precedence and operation at VTExpressionEvaluater                
  37                  'OPEN_BRACKET' => array('[(]', '_vt_processtoken_symbol'),
  38                  'CLOSE_BRACKET' => array('[)]', '_vt_processtoken_symbol'),
  39                  'COMMA' => array('[,]', '_vt_processtoken_symbol')
  40          );
  41          $tokenReArr = array();
  42          $tokenNames = array();
  43          $this->tokenTypes = $tokenTypes;
  44              
  45          foreach($tokenTypes as $tokenName => $code){
  46              list($re, $processtoken) = $code;
  47              $tokenReArr[] = '('.$re.')';
  48              $tokenNames[] = $tokenName;
  49          }
  50          $this->tokenNames = $tokenNames;
  51          $tokenRe = '/'.implode('|', $tokenReArr).'/';
  52          $this->EOF = new VTExpressionToken("EOF");
  53              
  54          $matches = array();
  55          preg_match_all($tokenRe, $expr, $matches, PREG_SET_ORDER);
  56          $this->matches = $matches;
  57          $this->idx = 0;
  58      }
  59  	function nextToken(){
  60          $matches = $this->matches;
  61          $idx = $this->idx;
  62          if($idx == sizeof($matches)){
  63              return $this->EOF;
  64          }else{
  65              $match = $matches[$idx];
  66              $this->idx = $idx + 1;
  67              $i=1;
  68              while($match[$i]==null){
  69                  $i+=1;
  70              }
  71              $tokenName = $this->tokenNames[$i-1];
  72              $token = new VTExpressionToken($tokenName);
  73              $token->value = $this->tokenTypes[$tokenName][1]($match[$i]);
  74              return $token;
  75          }
  76      }
  77  }
  78  
  79  class VTExpressionSpaceFilter{
  80  	function __construct($tokens){
  81          $this->tokens = $tokens;
  82      }
  83  
  84  	function nextToken(){
  85          do{
  86              $token = $this->tokens->nextToken();
  87          }while($token->label == "SPACE");
  88          return $token;
  89      }
  90  }
  91  
  92  
  93  ?>