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<?php |
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|
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/* |
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* Smarty plugin |
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* ------------------------------------------------------------- |
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* Type: function |
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* Name: math |
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* Purpose: handle math computations in template |
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* ------------------------------------------------------------- |
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*/ |
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function smarty_function_math($params, &$smarty) |
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{ |
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// be sure equation parameter is present |
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if (empty($params['equation'])) { |
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$smarty->trigger_error("math: missing equation parameter"); |
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return; |
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} |
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|
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$equation = $params['equation']; |
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|
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// make sure parenthesis are balanced |
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if (substr_count($equation,"(") != substr_count($equation,")")) { |
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$smarty->trigger_error("math: unbalanced parenthesis"); |
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return; |
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} |
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|
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// match all vars in equation, make sure all are passed |
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preg_match_all("![a-zA-Z][a-zA-Z0-9]*!",$equation, $match); |
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$allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', |
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'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); |
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|
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foreach($match[0] as $curr_var) { |
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if (!in_array($curr_var,array_keys($params)) && !in_array($curr_var, $allowed_funcs)) { |
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$smarty->trigger_error("math: parameter $curr_var not passed as argument"); |
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return; |
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} |
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} |
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|
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foreach($params as $key => $val) { |
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if ($key != "equation" && $key != "format" && $key != "assign") { |
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// make sure value is not empty |
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if (strlen($val)==0) { |
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$smarty->trigger_error("math: parameter $key is empty"); |
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return; |
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} |
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if (!is_numeric($val)) { |
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$smarty->trigger_error("math: parameter $key: is not numeric"); |
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return; |
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} |
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$equation = preg_replace("/\b$key\b/",$val, $equation); |
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} |
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} |
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|
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eval("\$smarty_math_result = ".$equation.";"); |
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|
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if (empty($params['format'])) { |
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if (empty($params['assign'])) { |
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echo $smarty_math_result; |
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} else { |
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$smarty->assign($params['assign'],$smarty_math_result); |
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} |
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} else { |
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if (empty($params['assign'])){ |
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printf($params['format'],$smarty_math_result); |
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} else { |
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$smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); |
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} |
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} |
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} |
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|
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/* vim: set expandtab: */ |
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|
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?> |
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