mirror of
https://github.com/smarty-php/smarty.git
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74 lines
2.3 KiB
PHP
74 lines
2.3 KiB
PHP
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<?php
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/*
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* Smarty plugin
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* -------------------------------------------------------------
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* Type: function
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* Name: math
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* Purpose: handle math computations in template
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* -------------------------------------------------------------
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*/
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function smarty_function_math($args, &$smarty_obj)
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{
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// be sure equation parameter is present
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if (empty($args["equation"])) {
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$smarty_obj->_trigger_error_msg("math: missing equation parameter");
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return;
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}
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$equation = $args["equation"];
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// make sure parenthesis are balanced
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if (substr_count($equation,"(") != substr_count($equation,")")) {
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$smarty_obj->_trigger_error_msg("math: unbalanced parenthesis");
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return;
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}
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// match all vars in equation, make sure all are passed
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preg_match_all("![a-zA-Z][a-zA-Z0-9]*!",$equation, $match);
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$allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
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'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
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foreach($match[0] as $curr_var) {
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if (!in_array($curr_var,array_keys($args)) && !in_array($curr_var, $allowed_funcs)) {
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$smarty_obj->_trigger_error_msg("math: parameter $curr_var not passed as argument");
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return;
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}
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}
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foreach($args as $key => $val) {
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if ($key != "equation" && $key != "format" && $key != "assign") {
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// make sure value is not empty
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if (strlen($val)==0) {
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$smarty_obj->_trigger_error_msg("math: parameter $key is empty");
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return;
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}
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if (!is_numeric($val)) {
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$smarty_obj->_trigger_error_msg("math: parameter $key: is not numeric");
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return;
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}
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$equation = preg_replace("/\b$key\b/",$val, $equation);
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}
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}
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eval("\$smarty_math_result = ".$equation.";");
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if (empty($args["format"])) {
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if (empty($args["assign"])) {
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echo $smarty_math_result;
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} else {
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$smarty_obj->assign($args["assign"],$smarty_math_result);
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}
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} else {
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if (empty($args["assign"])){
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printf($args["format"],$smarty_math_result);
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} else {
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$smarty_obj->assign($assign,sprintf($args["format"],$smarty_math_result));
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}
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}
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}
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/* vim: set expandtab: */
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?>
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