/bblog/smarty_plugins/function.math.php
PHP | 86 lines | 49 code | 11 blank | 26 comment | 19 complexity | 51fd14f08cb6df8a045b0e4394b27a0c MD5 | raw file
Possible License(s): AGPL-1.0
- <?php
- /**
- * Smarty plugin
- *
- * @subpackage plugins
- * @package Smarty
- */
- /**
- * 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)
- * @param array
- * @param Smarty
- * @param unknown $params
- * @param unknown $smarty (reference)
- * @return string
- */
- function smarty_function_math($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-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[2] as $curr_var) {
- if (!in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
- $smarty->trigger_error("math: parameter $curr_var not passed as argument");
- return;
- }
- }
- foreach ($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/", $val, $equation);
- }
- }
- eval("\$smarty_math_result = ".$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: */
- ?>