| 1 | <?php
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| 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 |
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| 8 |
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| 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 |
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| 30 | $equation = $params['equation'];
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| 31 |
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| 32 | // make sure parenthesis are balanced
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| 33 | if (substr_count($equation,"(") != substr_count($equation,")")) {
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| 34 | $smarty->trigger_error("math: unbalanced parenthesis");
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| 35 | return;
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| 36 | }
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| 37 |
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| 38 | // match all vars in equation, make sure all are passed
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| 39 | preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match);
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| 40 | $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
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| 41 | 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
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| 42 |
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| 43 | foreach($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 $curr_var not allowed");
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| 46 | return;
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | foreach($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'] ", $equation);
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| 62 | }
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| 63 | }
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| 64 |
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| 65 | eval("\$smarty_math_result = ".$equation.";");
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| 66 |
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| 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 |
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| 82 | /* vim: set expandtab: */
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| 83 |
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| 84 | ?>
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