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| Редакция | Автор | № строки | Строка |
|---|---|---|---|
| 2 | alex-w | 1 | <?php |
| 2 | /** |
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| 3 | * Smarty plugin |
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| 4 | * @package Smarty |
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| 5 | * @subpackage plugins |
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| 6 | */ |
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| 7 | |||
| 8 | |||
| 9 | /** |
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| 10 | * Smarty {math} function plugin |
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| 11 | * |
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| 12 | * Type: function<br> |
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| 13 | * Name: math<br> |
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| 14 | * Purpose: handle math computations in template<br> |
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| 15 | * @link http://smarty.php.net/manual/en/language.function.math.php {math} |
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| 16 | * (Smarty online manual) |
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| 17 | * @author Monte Ohrt <monte at ohrt dot com> |
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| 18 | * @param array |
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| 19 | * @param Smarty |
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| 20 | * @return string |
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| 21 | */ |
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| 22 | function smarty_function_math($params, &$smarty) |
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| 23 | { |
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| 24 | // be sure equation parameter is present |
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| 25 | if (empty($params['equation'])) { |
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| 26 | $smarty->trigger_error("math: missing equation parameter"); |
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| 27 | return; |
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| 28 | } |
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| 29 | |||
| 30 | $equation = $params['equation']; |
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| 31 | |||
| 32 | // make sure parenthesis are balanced |
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| 33 | if (substr_count($equation,"(") != substr_count($equation,")")) { |
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| 34 | $smarty->trigger_error("math: unbalanced parenthesis"); |
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| 35 | return; |
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| 36 | } |
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| 37 | |||
| 38 | // match all vars in equation, make sure all are passed |
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| 39 | preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match); |
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| 40 | $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', |
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| 41 | 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); |
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| 42 | |||
| 43 | foreach($match[1] as $curr_var) { |
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| 44 | if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) { |
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| 45 | $smarty->trigger_error("math: function call $curr_var not allowed"); |
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| 46 | return; |
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| 47 | } |
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| 48 | } |
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| 49 | |||
| 50 | foreach($params as $key => $val) { |
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| 51 | if ($key != "equation" && $key != "format" && $key != "assign") { |
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| 52 | // make sure value is not empty |
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| 53 | if (strlen($val)==0) { |
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| 54 | $smarty->trigger_error("math: parameter $key is empty"); |
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| 55 | return; |
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| 56 | } |
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| 57 | if (!is_numeric($val)) { |
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| 58 | $smarty->trigger_error("math: parameter $key: is not numeric"); |
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| 59 | return; |
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| 60 | } |
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| 61 | $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); |
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| 62 | } |
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| 63 | } |
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| 64 | |||
| 65 | eval("\$smarty_math_result = ".$equation.";"); |
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| 66 | |||
| 67 | if (empty($params['format'])) { |
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| 68 | if (empty($params['assign'])) { |
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| 69 | return $smarty_math_result; |
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| 70 | } else { |
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| 71 | $smarty->assign($params['assign'],$smarty_math_result); |
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| 72 | } |
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| 73 | } else { |
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| 74 | if (empty($params['assign'])){ |
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| 75 | printf($params['format'],$smarty_math_result); |
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| 76 | } else { |
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| 77 | $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); |
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| 78 | } |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | /* vim: set expandtab: */ |
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| 83 | |||
| 84 | ?> |