source: branches/feature-module-update/data/module/Smarty/libs/plugins/function.math.php @ 15080

Revision 15080, 2.5 KB checked in by nanasess, 17 years ago (diff)

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  • svn:mime-type - application/x-httpd-php; charset=UTF-8
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  • Property svn:keywords set to Id
  • Property svn:mime-type set to application/x-httpd-php; charset=UTF-8
Line 
1<?php
2/**
3 * Smarty plugin
4 * @package Smarty
5 * @subpackage plugins
6 */
7
8
9/**
10 * Smarty {math} function plugin
11 *
12 * Type:     function<br>
13 * Name:     math<br>
14 * Purpose:  handle math computations in template<br>
15 * @link http://smarty.php.net/manual/en/language.function.math.php {math}
16 *          (Smarty online manual)
17 * @author   Monte Ohrt <monte at ohrt dot com>
18 * @param array
19 * @param Smarty
20 * @return string
21 */
22function smarty_function_math($params, &$smarty)
23{
24    // be sure equation parameter is present
25    if (empty($params['equation'])) {
26        $smarty->trigger_error("math: missing equation parameter");
27        return;
28    }
29
30    $equation = $params['equation'];
31
32    // make sure parenthesis are balanced
33    if (substr_count($equation,"(") != substr_count($equation,")")) {
34        $smarty->trigger_error("math: unbalanced parenthesis");
35        return;
36    }
37
38    // match all vars in equation, make sure all are passed
39    preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match);
40    $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
41                           'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
42   
43    foreach($match[1] as $curr_var) {
44        if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
45            $smarty->trigger_error("math: function call $curr_var not allowed");
46            return;
47        }
48    }
49
50    foreach($params as $key => $val) {
51        if ($key != "equation" && $key != "format" && $key != "assign") {
52            // make sure value is not empty
53            if (strlen($val)==0) {
54                $smarty->trigger_error("math: parameter $key is empty");
55                return;
56            }
57            if (!is_numeric($val)) {
58                $smarty->trigger_error("math: parameter $key: is not numeric");
59                return;
60            }
61            $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
62        }
63    }
64
65    eval("\$smarty_math_result = ".$equation.";");
66
67    if (empty($params['format'])) {
68        if (empty($params['assign'])) {
69            return $smarty_math_result;
70        } else {
71            $smarty->assign($params['assign'],$smarty_math_result);
72        }
73    } else {
74        if (empty($params['assign'])){
75            printf($params['format'],$smarty_math_result);
76        } else {
77            $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result));
78        }
79    }
80}
81
82/* vim: set expandtab: */
83
84?>
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