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							109 lines
						
					
					
						
							3.4 KiB
						
					
					
				| <?php | |
| /** | |
|  * Smarty plugin | |
|  * This plugin is only for Smarty2 BC | |
|  * | |
|  * @package    Smarty | |
|  * @subpackage PluginsFunction | |
|  */ | |
| 
 | |
| /** | |
|  * Smarty {math} function plugin | |
|  * Type:     function<br> | |
|  * Name:     math<br> | |
|  * Purpose:  handle math computations in template | |
|  * | |
|  * @link     http://www.smarty.net/manual/en/language.function.math.php {math} | |
|  *           (Smarty online manual) | |
|  * @author   Monte Ohrt <monte at ohrt dot com> | |
|  * | |
|  * @param array                    $params   parameters | |
|  * @param Smarty | |
|  * | |
|  * @return string|null | |
|  */ | |
| function smarty_function_math($params, &$smarty) | |
| { | |
|     static $_allowed_funcs = | |
|         array('int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true, | |
|               'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true, 'rand' => true, | |
|               'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true, 'tan' => true); | |
|     // be sure equation parameter is present | |
|     if (empty($params[ 'equation' ])) { | |
|         trigger_error("math: missing equation parameter", E_USER_WARNING); | |
| 
 | |
|         return; | |
|     } | |
| 
 | |
|     $equation = $params[ 'equation' ]; | |
| 
 | |
|     // make sure parenthesis are balanced | |
|     if (substr_count($equation, "(") != substr_count($equation, ")")) { | |
|         trigger_error("math: unbalanced parenthesis", E_USER_WARNING); | |
| 
 | |
|         return; | |
|     } | |
| 
 | |
|     // disallow backticks | |
|     if (strpos($equation, '`') !== false) { | |
|         trigger_error("math: backtick character not allowed in equation", E_USER_WARNING); | |
| 
 | |
|         return; | |
|     } | |
| 
 | |
|     // also disallow dollar signs | |
|     if (strpos($equation, '$') !== false) { | |
|         trigger_error("math: dollar signs not allowed in equation", E_USER_WARNING); | |
| 
 | |
|         return; | |
|     } | |
| 
 | |
|     foreach ($params as $key => $val) { | |
|         if ($key != "equation" && $key != "format" && $key != "assign") { | |
|             // make sure value is not empty | |
|             if (strlen($val) == 0) { | |
|                 trigger_error("math: parameter '{$key}' is empty", E_USER_WARNING); | |
| 
 | |
|                 return; | |
|             } | |
|             if (!is_numeric($val)) { | |
|                 trigger_error("math: parameter '{$key}' is not numeric", E_USER_WARNING); | |
| 
 | |
|                 return; | |
|             } | |
|         } | |
|     } | |
| 
 | |
|     // match all vars in equation, make sure all are passed | |
|     preg_match_all('!(?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)!', $equation, $match); | |
| 
 | |
|     foreach ($match[ 1 ] as $curr_var) { | |
|         if ($curr_var && !isset($params[ $curr_var ]) && !isset($_allowed_funcs[ $curr_var ])) { | |
|             trigger_error("math: function call '{$curr_var}' not allowed, or missing parameter '{$curr_var}'", E_USER_WARNING); | |
| 
 | |
|             return; | |
|         } | |
|     } | |
| 
 | |
|     foreach ($params as $key => $val) { | |
|         if ($key != "equation" && $key != "format" && $key != "assign") { | |
|             $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); | |
|         } | |
|     } | |
|     $smarty_math_result = null; | |
|     eval("\$smarty_math_result = " . $equation . ";"); | |
| 
 | |
|     if (empty($params[ 'format' ])) { | |
|         if (empty($params[ 'assign' ])) { | |
|             return $smarty_math_result; | |
|         } else { | |
|             $smarty->assign($params[ 'assign' ], $smarty_math_result); | |
|         } | |
|     } else { | |
|         if (empty($params[ 'assign' ])) { | |
|             printf($params[ 'format' ], $smarty_math_result); | |
|         } else { | |
|             $smarty->assign($params[ 'assign' ], sprintf($params[ 'format' ], $smarty_math_result)); | |
|         } | |
|     } | |
| }
 | |
| 
 |