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