include/libs/template_lite/plugins/function.math.php

   1 <?php
   2
   3 /*
   4  * Template Lite plugin
   5  * -------------------------------------------------------------
   6  * Type:     function
   7  * Name:     math
   8  * Purpose:  handle math computations in template
   9  * Taken from the original Smarty
  10  * http://smarty.php.net
  11  * -------------------------------------------------------------
  12  */
  13 function tpl_function_math($params, &$template_object)
  14 {
  15     // be sure equation parameter is present
  16     if (empty($params['equation']))
  17         {
  18         throw new Template_Exception("math: missing equation parameter", $template_object);
  19         return;
  20     }
  21
  22     $equation = $params['equation'];
  23
  24     // make sure parenthesis are balanced
  25     if (substr_count($equation,"(") != substr_count($equation,")"))
  26         {
  27         throw new Template_Exception("math: unbalanced parenthesis", $template_object);
  28         return;
  29     }
  30
  31     // match all vars in equation, make sure all are passed
  32     preg_match_all("![a-zA-Z][a-zA-Z0-9_]*!",$equation, $match);
  33     $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
  34                            'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
  35
  36     foreach($match[0] as $curr_var)
  37         {
  38         if (!in_array($curr_var,array_keys($params)) && !in_array($curr_var, $allowed_funcs))
  39                 {
  40             throw new Template_Exception("math: parameter $curr_var not passed as argument", $template_object);
  41             return;
  42         }
  43     }
  44
  45     foreach($params as $key => $val)
  46         {
  47         if ($key != "equation" && $key != "format" && $key != "assign")
  48                 {
  49             // make sure value is not empty
  50             if (strlen($val)==0)
  51                         {
  52                 throw new Template_Exception("math: parameter $key is empty", $template_object);
  53                 return;
  54             }
  55             if (!is_numeric($val))
  56                         {
  57                 throw new Template_Exception("math: parameter $key: is not numeric", $template_object);
  58                 return;
  59             }
  60             $equation = preg_replace("/\b$key\b/",$val, $equation);
  61         }
  62     }
  63
  64     eval("\$template_object_math_result = ".$equation.";");
  65
  66     if (empty($params['format']))
  67         {
  68         if (empty($params['assign']))
  69                 {
  70             return $template_object_math_result;
  71         }
  72                 else
  73                 {
  74             $template_object->assign($params['assign'],$template_object_math_result);
  75         }
  76     }
  77         else
  78         {
  79         if (empty($params['assign']))
  80                 {
  81             printf($params['format'],$template_object_math_result);
  82         }
  83                 else
  84                 {
  85             $template_object->assign($params['assign'],sprintf($params['format'],$template_object_math_result));
  86         }
  87     }
  88 }
  89
  90 ?>