51ff3226 |
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 | $smarty->trigger_error("math: unbalanced parenthesis"); |
34 | return; |
35 | } |
36 | |
37 | // match all vars in equation, make sure all are passed |
38 | preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match); |
39 | $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', |
40 | 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); |
41 | |
42 | foreach($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 $curr_var not allowed"); |
45 | return; |
46 | } |
47 | } |
48 | |
49 | foreach($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 | ?> |