<?php
/**
* gTemplate Plugins
*
* @package gTemplate
* @subpackage Plugins
*/
/**
* gTemplate {math} function plugin
*
* Type: function<br>
* Name: math<br>
* Purpose: handle math computations in template<br>
*
* @version 1.0
* @author Tamas David (G-Lex) <glex at mittudomain.info>
* @link https://github.com/glex86/g-template-php G-Template Engine on Github
*
* @internal Some source codes are taken from Smarty
* @internal author Monte Ohrt <monte at ohrt dot com>
* @internal link http://smarty.net Smarty
*/
function tpl_function_math($params, &$gTpl) {
// be sure equation parameter is present
if (empty($params['equation'])) {
$gTpl->trigger_error("math: missing equation parameter");
return;
}
// strip out backticks, not necessary for math
$equation = str_replace('`', '', $params['equation']);
// make sure parenthesis are balanced
if (substr_count($equation, "(") != substr_count($equation, ")")) {
$gTpl->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)) {
$gTpl->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) {
$gTpl->trigger_error("math: parameter $key is empty");
return;
}
if (!is_numeric($val)) {
$gTpl->trigger_error("math: parameter $key: is not numeric");
return;
}
$equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
}
}
eval("\$gTpl_math_result = " . $equation . ";");
if (empty($params['format'])) {
if (empty($params['assign'])) {
return $gTpl_math_result;
} else {
$gTpl->assign($params['assign'], $gTpl_math_result);
}
} else {
if (empty($params['assign'])) {
printf($params['format'], $gTpl_math_result);
} else {
$gTpl->assign($params['assign'], sprintf($params['format'], $gTpl_math_result));
}
}
}
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