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<?php |
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/* |
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* |
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* (c) Yaroslav Honcharuk <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Yarhon\RouteGuardBundle\Security\Http; |
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/** |
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* @author Yaroslav Honcharuk <[email protected]> |
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*/ |
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class RegexParser |
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{ |
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private static $metaCharacters = '\\.+*?|^$[](){}'; |
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private static $removePreviousMetaCharacters = '+*?{|'; |
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/** |
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* @param string $expression |
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* |
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* @return array |
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*/ |
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public function parse($expression) |
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{ |
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$hasStringStartAssert = false; |
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$hasStringEndAssert = false; |
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$dynamicPartIsWildcard = false; |
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if ('^' === $expression[0]) { |
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$hasStringStartAssert = true; |
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$expression = substr($expression, 1); |
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} |
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$lastIndex = strlen($expression) - 1; |
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if ('$' === $expression[$lastIndex] && (!isset($expression[$lastIndex - 1]) || '\\' !== $expression[$lastIndex - 1])) { |
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$hasStringEndAssert = true; |
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$expression = substr($expression, 0, -1); |
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} |
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list($staticPrefix, $dynamicPart) = $this->parseStaticPrefix($expression); |
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if (('' === $dynamicPart && !$hasStringEndAssert) || '.*' === $dynamicPart) { |
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$dynamicPartIsWildcard = true; |
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} |
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return [ |
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'hasStringStartAssert' => $hasStringStartAssert, |
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'hasStringEndAssert' => $hasStringEndAssert, |
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'staticPrefix' => $staticPrefix, |
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'dynamicPartIsWildcard' => $dynamicPartIsWildcard, |
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]; |
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} |
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/** |
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* @param string $expression |
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* |
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* @return array |
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*/ |
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private function parseStaticPrefix($expression) |
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{ |
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$prefix = ''; |
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for ($i = 0; $i < strlen($expression); $i++) { |
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$symbol = $expression[$i]; |
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if (isset($expression[$i + 1])) { |
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$nextSymbol = $expression[$i + 1]; |
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if ('\\' === $symbol) { |
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if (false !== strpos(self::$metaCharacters, $nextSymbol)) { |
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// Escaped meta character symbol, i.e. "." |
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$prefix .= $nextSymbol; |
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$i++; |
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continue; |
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} |
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// Some special structure, like non-printing character / character type / assertion |
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break; |
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} |
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if (false !== strpos(self::$removePreviousMetaCharacters, $nextSymbol)) { |
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// Quantifier or alternative branch |
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break; |
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} |
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} |
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if (false !== strpos(self::$metaCharacters, $symbol)) { |
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break; |
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} |
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$prefix .= $symbol; |
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} |
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if (strlen($expression) === $i) { |
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// Before PHP 7.0, if string is equal to start characters long, FALSE was returned. |
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// @see http://php.net/manual/en/function.substr.php |
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$dynamicPart = ''; |
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} else { |
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$dynamicPart = substr($expression, $i); |
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} |
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return [$prefix, $dynamicPart]; |
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} |
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} |
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yarhon /
RouteGuardBundle
