File lass/smarty/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_Internal_Template $template template object
 22:  *
 23:  * @return string|null
 24:  */
 25: function smarty_function_math($params, $template)
 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:     // match all vars in equation, make sure all are passed
 62:     preg_match_all('!(?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)!', $equation, $match);
 63: 
 64:     foreach ($match[ 1 ] as $curr_var) {
 65:         if ($curr_var && !isset($params[ $curr_var ]) && !isset($_allowed_funcs[ $curr_var ])) {
 66:             trigger_error("math: function call $curr_var not allowed", E_USER_WARNING);
 67: 
 68:             return;
 69:         }
 70:     }
 71: 
 72:     foreach ($params as $key => $val) {
 73:         if ($key != "equation" && $key != "format" && $key != "assign") {
 74:             // make sure value is not empty
 75:             if (strlen($val) == 0) {
 76:                 trigger_error("math: parameter $key is empty", E_USER_WARNING);
 77: 
 78:                 return;
 79:             }
 80:             if (!is_numeric($val)) {
 81:                 trigger_error("math: parameter $key: is not numeric", E_USER_WARNING);
 82: 
 83:                 return;
 84:             }
 85:             $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
 86:         }
 87:     }
 88:     $smarty_math_result = null;
 89:     eval("\$smarty_math_result = " . $equation . ";");
 90: 
 91:     if (empty($params[ 'format' ])) {
 92:         if (empty($params[ 'assign' ])) {
 93:             return $smarty_math_result;
 94:         } else {
 95:             $template->assign($params[ 'assign' ], $smarty_math_result);
 96:         }
 97:     } else {
 98:         if (empty($params[ 'assign' ])) {
 99:             printf($params[ 'format' ], $smarty_math_result);
100:         } else {
101:             $template->assign($params[ 'assign' ], sprintf($params[ 'format' ], $smarty_math_result));
102:         }
103:     }
104: }
105:
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