Commit | Line | Data |
---|---|---|
e586807d H |
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 | * @param array | |
18 | * @param Smarty | |
19 | * @return string | |
20 | */ | |
21 | function smarty_function_math($params, &$smarty) | |
22 | { | |
23 | // be sure equation parameter is present | |
24 | if (empty($params['equation'])) { | |
25 | $smarty->trigger_error("math: missing equation parameter"); | |
26 | return; | |
27 | } | |
28 | ||
29 | $equation = $params['equation']; | |
30 | ||
31 | // make sure parenthesis are balanced | |
32 | if (substr_count($equation,"(") != substr_count($equation,")")) { | |
33 | $smarty->trigger_error("math: unbalanced parenthesis"); | |
34 | return; | |
35 | } | |
36 | ||
37 | // match all vars in equation, make sure all are passed | |
b42b2bf9 | 38 | preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match); |
e586807d H |
39 | $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', |
40 | 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); | |
b42b2bf9 H |
41 | |
42 | foreach($match[1] as $curr_var) { | |
43 | if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) { | |
44 | $smarty->trigger_error("math: function call $curr_var not allowed"); | |
e586807d H |
45 | return; |
46 | } | |
47 | } | |
48 | ||
49 | foreach($params as $key => $val) { | |
50 | if ($key != "equation" && $key != "format" && $key != "assign") { | |
51 | // make sure value is not empty | |
52 | if (strlen($val)==0) { | |
53 | $smarty->trigger_error("math: parameter $key is empty"); | |
54 | return; | |
55 | } | |
56 | if (!is_numeric($val)) { | |
57 | $smarty->trigger_error("math: parameter $key: is not numeric"); | |
58 | return; | |
59 | } | |
60 | $equation = preg_replace("/\b$key\b/",$val, $equation); | |
61 | } | |
62 | } | |
63 | ||
64 | eval("\$smarty_math_result = ".$equation.";"); | |
65 | ||
66 | if (empty($params['format'])) { | |
67 | if (empty($params['assign'])) { | |
68 | return $smarty_math_result; | |
69 | } else { | |
70 | $smarty->assign($params['assign'],$smarty_math_result); | |
71 | } | |
72 | } else { | |
73 | if (empty($params['assign'])){ | |
74 | printf($params['format'],$smarty_math_result); | |
75 | } else { | |
76 | $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); | |
77 | } | |
78 | } | |
79 | } | |
80 | ||
81 | /* vim: set expandtab: */ | |
82 | ||
83 | ?> |