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<?php |
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/** |
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* vipnytt/RobotsTxtParser |
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* |
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* @link https://github.com/VIPnytt/RobotsTxtParser |
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* @license https://github.com/VIPnytt/RobotsTxtParser/blob/master/LICENSE The MIT License (MIT) |
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*/ |
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namespace vipnytt\RobotsTxtParser\Parser\Directives; |
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use vipnytt\RobotsTxtParser\Client\Directives\AllowClient; |
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use vipnytt\RobotsTxtParser\Handler\RenderHandler; |
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use vipnytt\RobotsTxtParser\RobotsTxtInterface; |
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/** |
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* Class AllowParser |
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* |
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* @package vipnytt\RobotsTxtParser\Parser\Directives |
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*/ |
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class AllowParser implements ParserInterface, RobotsTxtInterface |
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{ |
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/** |
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* Directive |
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* @var string |
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*/ |
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private $directive; |
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/** |
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* Path |
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* @var array |
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*/ |
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private $path = []; |
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/** |
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* Sort result |
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* @var bool |
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*/ |
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private $sort = false; |
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/** |
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* AllowParser constructor |
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* |
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* @param string $directive |
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*/ |
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public function __construct($directive) |
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{ |
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$this->directive = $directive; |
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} |
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/** |
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* Add |
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* |
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* @param string $line |
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* @return bool |
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*/ |
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public function add($line) |
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{ |
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$line = $this->normalize($line); |
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if (substr($line, 0, 1) == '/' && |
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!in_array($line, $this->path) |
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) { |
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$this->path[] = $line; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Normalize rules |
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* |
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* @param $line |
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* @return string |
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*/ |
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private function normalize($line) |
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{ |
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// Prepend slash if starting with an wildcard |
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if (substr($line, 0, 1) == '*') { |
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$line = '/' . $line; |
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} |
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// Remove unnecessary characters after an end anchor |
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if (($pos = mb_strpos($line, '$')) !== false) { |
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$line = mb_substr($line, 0, $pos + 1); |
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} |
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// Remove unnecessary wildcards |
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$line = rtrim($line, '*'); |
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return $line; |
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} |
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/** |
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* Render |
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* |
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* @param RenderHandler $handler |
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* @return bool |
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*/ |
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public function render(RenderHandler $handler) |
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{ |
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if ($this->directive === self::DIRECTIVE_DISALLOW && |
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count($this->path) === 0 && |
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$handler->getLevel() == 2 |
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) { |
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$handler->add($this->directive, ''); |
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return true; |
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} |
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$this->sort(); |
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foreach ($this->path as $path) { |
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$handler->add($this->directive, $path); |
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} |
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return true; |
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} |
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/** |
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* Sort by length |
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* |
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* @return bool |
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*/ |
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private function sort() |
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{ |
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if ($this->sort) { |
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return $this->sort; |
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}; |
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return $this->sort = rsort($this->path) && usort($this->path, function ($a, $b) { |
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// PHP 7: Switch to the <=> "Spaceship" operator |
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return mb_strlen($a) - mb_strlen($b); |
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}); |
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} |
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/** |
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* Client |
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* |
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* @return AllowClient |
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*/ |
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public function client() |
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{ |
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$this->sort(); |
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return new AllowClient($this->path); |
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} |
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} |
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VIPnytt /
RobotsTxtParser
