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| /** | |
| * Smarty plugin | |
| * @package Smarty | |
| * @subpackage plugins | |
| */ | |
| /** | |
| * Smarty {math} function plugin | |
| * | |
| * Type: function<br> | |
| * Name: math<br> | |
| * Purpose: handle math computations in template<br> | |
| * @link http://smarty.php.net/manual/en/language.function.math.php {math} | |
| * (Smarty online manual) | |
| * @author Monte Ohrt <monte at ohrt dot com> | |
| * @param array | |
| * @param Smarty | |
| * @return string | |
| */ | |
| function smarty_function_math($params, &$smarty) | |
| { | |
| // be sure equation parameter is present | |
| if (empty($params['equation'])) { | |
| $smarty->trigger_error("math: missing equation parameter"); | |
| return; | |
| } | |
| $equation = $params['equation']; | |
| // make sure parenthesis are balanced | |
| if (substr_count($equation,"(") != substr_count($equation,")")) { | |
| $smarty->trigger_error("math: unbalanced parenthesis"); | |
| return; | |
| } | |
| // match all vars in equation, make sure all are passed | |
| preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match); | |
| $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', | |
| 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); | |
| foreach($match[1] as $curr_var) { | |
| if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) { | |
| $smarty->trigger_error("math: function call $curr_var not allowed"); | |
| return; | |
| } | |
| } | |
| foreach($params as $key => $val) { | |
| if ($key != "equation" && $key != "format" && $key != "assign") { | |
| // make sure value is not empty | |
| if (strlen($val)==0) { | |
| $smarty->trigger_error("math: parameter $key is empty"); | |
| return; | |
| } | |
| if (!is_numeric($val)) { | |
| $smarty->trigger_error("math: parameter $key: is not numeric"); | |
| return; | |
| } | |
| $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); | |
| } | |
| } | |
| eval("\$smarty_math_result = ".$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)); | |
| } | |
| } | |
| } | |
| /* vim: set expandtab: */ | |