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<?php |
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declare(strict_types=1); |
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namespace Casbin\Util; |
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use Casbin\Exceptions\CasbinException; |
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/** |
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* Class Util. |
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* |
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* @author [email protected] |
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*/ |
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class Util |
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{ |
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const REGEXP = '/\beval\((?P<rule>[^),]*)\)/'; |
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/** |
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* escapes the dots in the assertion, because the expression evaluation doesn't support such variable names. |
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* |
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* @param string $s |
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* |
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* @return string |
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*/ |
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210 |
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public static function escapeAssertion(string $s): string |
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{ |
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210 |
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if (0 === strpos($s, 'r.')) { |
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$s = substr_replace($s, 'r_', 0, 2); |
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} |
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210 |
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if (0 === strpos($s, 'p.')) { |
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$s = substr_replace($s, 'p_', 0, 2); |
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} |
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$s = preg_replace_callback("~(\|| |=|\)|\(|&|<|>|,|\+|-|!|\*|\/)(r|p)(\.)~", function ($m) { |
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return $m[1].$m[2].'_'; |
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210 |
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}, $s); |
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210 |
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if (null === $s) { |
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throw new CasbinException(sprintf('Unable to escape assertion "%s"', $s)); |
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} |
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return $s; |
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} |
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/** |
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* removes the comments starting with # in the text. |
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* |
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* @param string $s |
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* |
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* @return string |
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*/ |
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public static function removeComments(string $s): string |
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{ |
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$pos = strpos($s, '#'); |
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return false === $pos ? $s : trim(substr($s, 0, $pos)); |
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} |
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/** |
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* gets a printable string for a string array. |
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* |
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* @param array $s |
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* |
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* @return string |
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*/ |
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public static function arrayToString(array $s): string |
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{ |
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return implode(', ', $s); |
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} |
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/** |
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* removes any duplicated elements in a string array. |
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* |
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* @param array $s |
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*/ |
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public static function arrayRemoveDuplicates(array &$s): void |
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{ |
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$s = array_keys(array_flip($s)); |
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} |
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/** |
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* determine whether matcher contains function eval. |
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* |
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* @param string $s |
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* |
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* @return bool |
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*/ |
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public static function hasEval(string $s): bool |
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{ |
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return (bool) preg_match(self::REGEXP, $s); |
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} |
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/** |
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* replace function eval with the value of its parameters. |
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* |
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* @param string $s |
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* @param string $rule |
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* |
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* @return string |
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*/ |
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public static function replaceEval(string $s, string $rule): string |
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{ |
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return preg_replace(self::REGEXP, '('.$rule.')', $s); |
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} |
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/** |
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* returns the parameters of function eval. |
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* |
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* @param string $s |
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* |
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* @return array |
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*/ |
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public static function getEvalValue(string $s): array |
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{ |
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preg_match_all(self::REGEXP, $s, $matches); |
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return $matches['rule']; |
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} |
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} |
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php-casbin /
php-casbin
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