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<?php |
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namespace vipnytt\RobotsTxtParser; |
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use vipnytt\RobotsTxtParser\Exceptions\EncodingException; |
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use vipnytt\RobotsTxtParser\Parser\Directives\CleanParam; |
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use vipnytt\RobotsTxtParser\Parser\Directives\Host; |
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use vipnytt\RobotsTxtParser\Parser\Directives\Sitemap; |
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use vipnytt\RobotsTxtParser\Parser\Directives\UserAgent; |
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use vipnytt\RobotsTxtParser\Parser\RobotsTxtInterface; |
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use vipnytt\RobotsTxtParser\Parser\Toolbox; |
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/** |
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* Class Core |
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* |
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* @package vipnytt\RobotsTxtParser |
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*/ |
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abstract class Parser implements RobotsTxtInterface |
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{ |
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use Toolbox; |
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/** |
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* Directive white list |
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*/ |
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const TOP_LEVEL_DIRECTIVES = [ |
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self::DIRECTIVE_CLEAN_PARAM, |
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self::DIRECTIVE_HOST, |
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self::DIRECTIVE_SITEMAP, |
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self::DIRECTIVE_USER_AGENT, |
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]; |
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/** |
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* Previous directive |
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* @var string |
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*/ |
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protected $previousDirective; |
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/** |
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* Current user-agent(s) |
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* @var array |
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*/ |
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protected $userAgentValues; |
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/** |
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* Clean-param class |
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* @var CleanParam |
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*/ |
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protected $cleanParam; |
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/** |
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* Host class |
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* @var Host |
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*/ |
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protected $host; |
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/** |
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* Sitemap class |
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* @var Sitemap |
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*/ |
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protected $sitemap; |
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/** |
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* User-agent class |
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* @var UserAgent |
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*/ |
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protected $userAgent; |
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/** |
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* Core constructor. |
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* |
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* @param string $content - file content |
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* @param string $encoding - character encoding |
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* @param int|null $byteLimit - maximum of bytes to parse |
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* @throws EncodingException |
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*/ |
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public function __construct($content, $encoding = self::ENCODING, $byteLimit = self::BYTE_LIMIT) |
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{ |
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if (!mb_internal_encoding($encoding)) { |
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throw new EncodingException('Unable to set internal character encoding to `' . $encoding . '`'); |
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} |
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$this->cleanParam = new CleanParam(); |
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$this->host = new Host(); |
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$this->sitemap = new Sitemap(); |
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$this->userAgent = new UserAgent(); |
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if (is_int($byteLimit) && $byteLimit > 0) { |
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$content = mb_strcut($content, 0, $byteLimit); |
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} |
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$this->parseTxt($content); |
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} |
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/** |
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* Parse robots.txt |
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* |
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* @param string $txt |
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* @return void |
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*/ |
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private function parseTxt($txt) |
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{ |
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$lines = array_filter(array_map('trim', mb_split('\r\n|\n|\r', $txt))); |
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// Parse each line individually |
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foreach ($lines as $line) { |
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// Limit rule length |
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$line = mb_substr($line, 0, self::MAX_LENGTH_RULE); |
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// Remove comments |
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$line = mb_split('#', $line, 2)[0]; |
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// Parse line |
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$this->add($line); |
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} |
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} |
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/** |
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* Add line |
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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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$previousDirective = $this->previousDirective; |
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$pair = $this->generateRulePair($line, self::TOP_LEVEL_DIRECTIVES); |
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if ($pair['directive'] === self::DIRECTIVE_USER_AGENT) { |
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if ($previousDirective !== self::DIRECTIVE_USER_AGENT) { |
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$this->userAgentValues = []; |
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} |
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$this->userAgentValues[] = $pair['value']; |
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} |
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$this->previousDirective = $pair['directive']; |
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switch ($pair['directive']) { |
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case self::DIRECTIVE_CLEAN_PARAM: |
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return $this->cleanParam->add($pair['value']); |
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case self::DIRECTIVE_HOST: |
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return $this->host->add($pair['value']); |
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case self::DIRECTIVE_SITEMAP: |
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return $this->sitemap->add($pair['value']); |
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case self::DIRECTIVE_USER_AGENT: |
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return $this->userAgent->set($this->userAgentValues); |
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} |
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return $this->userAgent->add($line); |
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} |
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/** |
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* Export |
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* |
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* @return array |
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*/ |
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public function export() |
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{ |
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return $this->cleanParam->export() |
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+ $this->host->export() |
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+ $this->sitemap->export() |
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+ $this->userAgent->export(); |
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} |
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} |
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VIPnytt /
RobotsTxtParser
