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104 lines
3.3 KiB
104 lines
3.3 KiB
<?php |
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/** |
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* Smarty plugin |
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* This plugin is only for Smarty2 BC |
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* |
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* @package Smarty |
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* @subpackage PluginsFunction |
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*/ |
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/** |
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* Smarty {math} function plugin |
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* Type: function<br> |
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* Name: math<br> |
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* Purpose: handle math computations in template |
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* |
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* @link http://www.smarty.net/manual/en/language.function.math.php {math} |
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* (Smarty online manual) |
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* @author Monte Ohrt <monte at ohrt dot com> |
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* |
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* @param array $params parameters |
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* @param Smarty_Internal_Template $template template object |
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* |
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* @return string|null |
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*/ |
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function smarty_function_math($params, $template) |
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{ |
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static $_allowed_funcs = |
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array('int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true, |
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'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true, 'rand' => true, |
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'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true, 'tan' => true); |
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// be sure equation parameter is present |
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if (empty($params[ 'equation' ])) { |
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trigger_error("math: missing equation parameter", E_USER_WARNING); |
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return; |
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} |
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$equation = $params[ 'equation' ]; |
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// make sure parenthesis are balanced |
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if (substr_count($equation, "(") != substr_count($equation, ")")) { |
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trigger_error("math: unbalanced parenthesis", E_USER_WARNING); |
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return; |
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} |
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// disallow backticks |
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if (strpos($equation, '`') !== false) { |
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trigger_error("math: backtick character not allowed in equation", E_USER_WARNING); |
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return; |
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} |
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// also disallow dollar signs |
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if (strpos($equation, '$') !== false) { |
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trigger_error("math: dollar signs not allowed in equation", E_USER_WARNING); |
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return; |
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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('!(?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)!', $equation, $match); |
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foreach ($match[ 1 ] as $curr_var) { |
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if ($curr_var && !isset($params[ $curr_var ]) && !isset($_allowed_funcs[ $curr_var ])) { |
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trigger_error("math: function call $curr_var not allowed", E_USER_WARNING); |
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return; |
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} |
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} |
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foreach ($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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trigger_error("math: parameter $key is empty", E_USER_WARNING); |
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return; |
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} |
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if (!is_numeric($val)) { |
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trigger_error("math: parameter $key: is not numeric", E_USER_WARNING); |
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return; |
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} |
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$equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); |
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} |
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} |
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$smarty_math_result = null; |
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eval("\$smarty_math_result = " . $equation . ";"); |
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if (empty($params[ 'format' ])) { |
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if (empty($params[ 'assign' ])) { |
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return $smarty_math_result; |
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} else { |
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$template->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' ], $smarty_math_result); |
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} else { |
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$template->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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