| 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 | $smarty->trigger_error("math: unbalanced parenthesis"); |
| 34 | return; |
| 35 | } |
| 36 | |
| 37 | // match all vars in equation, make sure all are passed |
| 38 | preg_match_all("!\!(0x)([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match); |
| 39 | $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', |
| 40 | 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); |
| 41 | foreach($match[2] as $curr_var) { |
| 42 | if (!in_array($curr_var,array_keys($params)) && !in_array($curr_var, $allowed_funcs)) { |
| 43 | $smarty->trigger_error("math: parameter $curr_var not passed as argument"); |
| 44 | return; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | foreach($params as $key => $val) { |
| 49 | if ($key != "equation" && $key != "format" && $key != "assign") { |
| 50 | // make sure value is not empty |
| 51 | if (strlen($val)==0) { |
| 52 | $smarty->trigger_error("math: parameter $key is empty"); |
| 53 | return; |
| 54 | } |
| 55 | if (!is_numeric($val)) { |
| 56 | $smarty->trigger_error("math: parameter $key: is not numeric"); |
| 57 | return; |
| 58 | } |
| 59 | $equation = preg_replace("/\b$key\b/",$val, $equation); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | eval("\$smarty_math_result = ".$equation.";"); |
| 64 | |
| 65 | if (empty($params['format'])) { |
| 66 | if (empty($params['assign'])) { |
| 67 | return $smarty_math_result; |
| 68 | } else { |
| 69 | $smarty->assign($params['assign'],$smarty_math_result); |
| 70 | } |
| 71 | } else { |
| 72 | if (empty($params['assign'])){ |
| 73 | printf($params['format'],$smarty_math_result); |
| 74 | } else { |
| 75 | $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | /* vim: set expandtab: */ |
| 81 | |
| 82 | ?> |