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   1  <?php
   2  /**
   3   * Smarty plugin
   4   * @package Smarty
   5   * @subpackage plugins
   6   */
   7  
   8  
   9  /**
  10   * Smarty {math} function plugin
  11   *
  12   * Type:     function<br>
  13   * Name:     math<br>
  14   * Purpose:  handle math computations in template<br>
  15   * @link http://smarty.php.net/manual/en/language.function.math.php {math}
  16   *          (Smarty online manual)
  17   * @author   Monte Ohrt <monte at ohrt dot com>
  18   * @param array
  19   * @param Smarty
  20   * @return string
  21   */
  22  function smarty_function_math($params, &$smarty)
  23  {
  24      // be sure equation parameter is present
  25      if (empty($params['equation'])) {
  26          $smarty->trigger_error("math: missing equation parameter");
  27          return;
  28      }
  29  
  30      $equation = $params['equation'];
  31  
  32      // make sure parenthesis are balanced
  33      if (substr_count($equation,"(") != substr_count($equation,")")) {
  34          $smarty->trigger_error("math: unbalanced parenthesis");
  35          return;
  36      }
  37  
  38      // match all vars in equation, make sure all are passed
  39      preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match);
  40      $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
  41                             'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
  42      
  43      foreach($match[1] as $curr_var) {
  44          if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
  45              $smarty->trigger_error("math: function call $curr_var not allowed");
  46              return;
  47          }
  48      }
  49  
  50      foreach($params as $key => $val) {
  51          if ($key != "equation" && $key != "format" && $key != "assign") {
  52              // make sure value is not empty
  53              if (strlen($val)==0) {
  54                  $smarty->trigger_error("math: parameter $key is empty");
  55                  return;
  56              }
  57              if (!is_numeric($val)) {
  58                  $smarty->trigger_error("math: parameter $key: is not numeric");
  59                  return;
  60              }
  61              $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
  62          }
  63      }
  64  
  65      eval("\$smarty_math_result = ".$equation.";");
  66  
  67      if (empty($params['format'])) {
  68          if (empty($params['assign'])) {
  69              return $smarty_math_result;
  70          } else {
  71              $smarty->assign($params['assign'],$smarty_math_result);
  72          }
  73      } else {
  74          if (empty($params['assign'])){
  75              printf($params['format'],$smarty_math_result);
  76          } else {
  77              $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result));
  78          }
  79      }
  80  }
  81  
  82  /* vim: set expandtab: */
  83  
  84  ?>