vendor/smarty/smarty/libs/plugins/function.math.php

   1 <?php
   2 /**
   3  * Smarty plugin
   4  * This plugin is only for Smarty2 BC
   5  *
   6  * @package    Smarty
   7  * @subpackage PluginsFunction
   8  */
   9
  10 /**
  11  * Smarty {math} function plugin
  12  * Type:     function<br>
  13  * Name:     math<br>
  14  * Purpose:  handle math computations in template
  15  *
  16  * @link     http://www.smarty.net/manual/en/language.function.math.php {math}
  17  *           (Smarty online manual)
  18  * @author   Monte Ohrt <monte at ohrt dot com>
  19  *
  20  * @param array                    $params   parameters
  21  * @param Smarty
  22  *
  23  * @return string|null
  24  */
  25 function smarty_function_math($params, &$smarty)
  26 {
  27     static $_allowed_funcs =
  28         array('int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true,
  29               'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true, 'rand' => true,
  30               'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true, 'tan' => true);
  31     // be sure equation parameter is present
  32     if (empty($params[ 'equation' ])) {
  33         trigger_error("math: missing equation parameter", E_USER_WARNING);
  34
  35         return;
  36     }
  37
  38     $equation = $params[ 'equation' ];
  39
  40     // make sure parenthesis are balanced
  41     if (substr_count($equation, "(") != substr_count($equation, ")")) {
  42         trigger_error("math: unbalanced parenthesis", E_USER_WARNING);
  43
  44         return;
  45     }
  46
  47     // disallow backticks
  48     if (strpos($equation, '`') !== false) {
  49         trigger_error("math: backtick character not allowed in equation", E_USER_WARNING);
  50
  51         return;
  52     }
  53
  54     // also disallow dollar signs
  55     if (strpos($equation, '$') !== false) {
  56         trigger_error("math: dollar signs not allowed in equation", E_USER_WARNING);
  57
  58         return;
  59     }
  60
  61     foreach ($params as $key => $val) {
  62         if ($key != "equation" && $key != "format" && $key != "assign") {
  63             // make sure value is not empty
  64             if (strlen($val) == 0) {
  65                 trigger_error("math: parameter '{$key}' is empty", E_USER_WARNING);
  66
  67                 return;
  68             }
  69             if (!is_numeric($val)) {
  70                 trigger_error("math: parameter '{$key}' is not numeric", E_USER_WARNING);
  71
  72                 return;
  73             }
  74         }
  75     }
  76
  77     // match all vars in equation, make sure all are passed
  78     preg_match_all('!(?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)!', $equation, $match);
  79
  80     foreach ($match[ 1 ] as $curr_var) {
  81         if ($curr_var && !isset($params[ $curr_var ]) && !isset($_allowed_funcs[ $curr_var ])) {
  82             trigger_error("math: function call '{$curr_var}' not allowed, or missing parameter '{$curr_var}'", E_USER_WARNING);
  83
  84             return;
  85         }
  86     }
  87
  88     foreach ($params as $key => $val) {
  89         if ($key != "equation" && $key != "format" && $key != "assign") {
  90             $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
  91         }
  92     }
  93     $smarty_math_result = null;
  94     eval("\$smarty_math_result = " . $equation . ";");
  95
  96     if (empty($params[ 'format' ])) {
  97         if (empty($params[ 'assign' ])) {
  98             return $smarty_math_result;
  99         } else {
 100             $smarty->assign($params[ 'assign' ], $smarty_math_result);
 101         }
 102     } else {
 103         if (empty($params[ 'assign' ])) {
 104             printf($params[ 'format' ], $smarty_math_result);
 105         } else {
 106             $smarty->assign($params[ 'assign' ], sprintf($params[ 'format' ], $smarty_math_result));
 107         }
 108     }
 109 }