| 1 | <?php |
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| 2 | /** |
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| 3 | * Smarty plugin |
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| 4 | * |
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| 5 | * This plugin is only for Smarty2 BC |
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| 6 | * @package Smarty |
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| 7 | * @subpackage PluginsFunction |
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| 8 | */ |
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| 9 | |
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| 10 | /** |
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| 11 | * Smarty {math} function plugin |
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| 12 | * |
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| 13 | * Type: function<br> |
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| 14 | * Name: math<br> |
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| 15 | * Purpose: handle math computations in template |
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| 16 | * |
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| 17 | * @link http://www.smarty.net/manual/en/language.function.math.php {math} |
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| 18 | * (Smarty online manual) |
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| 19 | * @author Monte Ohrt <monte at ohrt dot com> |
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| 20 | * @param array $params parameters |
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| 21 | * @param Smarty_Internal_Template $template template object |
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| 22 | * @return string|null |
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| 23 | */ |
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| 24 | function smarty_function_math($params, $template) |
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| 25 | { |
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| 26 | static $_allowed_funcs = array( |
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| 27 | 'int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true, |
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| 28 | 'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true, |
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| 29 | 'rand' => true, 'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true ,'tan' => true |
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| 30 | ); |
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| 31 | // be sure equation parameter is present |
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| 32 | if (empty($params['equation'])) { |
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| 33 | trigger_error("math: missing equation parameter",E_USER_WARNING); |
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| 34 | return; |
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| 35 | } |
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| 36 | |
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| 37 | $equation = $params['equation']; |
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| 38 | |
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| 39 | // make sure parenthesis are balanced |
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| 40 | if (substr_count($equation,"(") != substr_count($equation,")")) { |
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| 41 | trigger_error("math: unbalanced parenthesis",E_USER_WARNING); |
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| 42 | return; |
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| 43 | } |
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| 44 | |
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| 45 | // match all vars in equation, make sure all are passed |
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| 46 | preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match); |
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| 47 | |
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| 48 | foreach($match[1] as $curr_var) { |
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| 49 | if ($curr_var && !isset($params[$curr_var]) && !isset($_allowed_funcs[$curr_var])) { |
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| 50 | trigger_error("math: function call $curr_var not allowed",E_USER_WARNING); |
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| 51 | return; |
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| 52 | } |
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| 53 | } |
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| 54 | |
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| 55 | foreach($params as $key => $val) { |
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| 56 | if ($key != "equation" && $key != "format" && $key != "assign") { |
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| 57 | // make sure value is not empty |
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| 58 | if (strlen($val)==0) { |
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| 59 | trigger_error("math: parameter $key is empty",E_USER_WARNING); |
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| 60 | return; |
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| 61 | } |
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| 62 | if (!is_numeric($val)) { |
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| 63 | trigger_error("math: parameter $key: is not numeric",E_USER_WARNING); |
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| 64 | return; |
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| 65 | } |
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| 66 | $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); |
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| 67 | } |
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| 68 | } |
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| 69 | $smarty_math_result = null; |
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| 70 | eval("\$smarty_math_result = ".$equation.";"); |
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| 71 | |
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| 72 | if (empty($params['format'])) { |
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| 73 | if (empty($params['assign'])) { |
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| 74 | return $smarty_math_result; |
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| 75 | } else { |
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| 76 | $template->assign($params['assign'],$smarty_math_result); |
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| 77 | } |
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| 78 | } else { |
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| 79 | if (empty($params['assign'])){ |
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| 80 | printf($params['format'],$smarty_math_result); |
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| 81 | } else { |
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| 82 | $template->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | ?> |
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