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<?php |
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namespace vipnytt\RobotsTxtParser\Parser\Directives; |
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use DateTimeZone; |
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use vipnytt\RobotsTxtParser\Exceptions\ParserException; |
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/** |
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* Class DirectiveParserCommons |
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* |
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* @package vipnytt\RobotsTxtParser\Directive |
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*/ |
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trait DirectiveParserCommons |
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{ |
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/** |
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* Check path rule |
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* |
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* @param string $path |
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* @param string[] $paths |
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* @return bool |
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*/ |
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private function checkPaths($path, array $paths) |
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{ |
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foreach ($paths as $rule) { |
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$escape = [ |
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'?' => '\?', |
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'.' => '\.', |
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'*' => '.*', |
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]; |
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foreach ($escape as $search => $replace) { |
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$rule = str_replace($search, $replace, $rule); |
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} |
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if ($this->checkPathsCallback($rule, $path)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Callback for CheckPath |
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* |
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* @param string $rule |
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* @param string $path |
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* @return bool |
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*/ |
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private function checkPathsCallback($rule, $path) |
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{ |
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/** |
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* Warning: preg_match need to be replaced |
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* |
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* Bug report |
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* @link https://github.com/t1gor/Robots.txt-Core-Class/issues/62 |
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* |
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* An robots.txt parser, where a bug-fix is planned |
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* @link https://github.com/diggin/Diggin_RobotRules |
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* |
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* The solution? |
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* PHP PEG (parsing expression grammar) |
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* @link https://github.com/hafriedlander/php-peg |
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*/ |
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try { |
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if (!preg_match('#' . $rule . '#', $path)) { |
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// Rule does not match |
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return false; |
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} elseif ( |
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mb_stripos($rule, '$') === false || // No special parsing required |
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mb_substr($rule, 0, -1) == $path // Rule does contain an end anchor, and matches |
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) { |
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return true; |
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} elseif (($wildcardPos = mb_strrpos($rule, '*')) !== false) { |
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// Rule contains both an end anchor ($) and wildcard (*) |
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$afterWildcard = mb_substr($rule, $wildcardPos + 1, mb_strlen($rule) - $wildcardPos - 2); |
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if ($afterWildcard == mb_substr($path, -mb_strlen($afterWildcard))) { |
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return true; |
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} |
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} |
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} catch (\Exception $e) { |
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// An preg_match bug has occurred |
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} |
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return false; |
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} |
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/** |
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* Generate directive/rule pair |
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* |
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* @param string $line |
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* @param string[] $whiteList |
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* @return string[]|false |
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*/ |
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private function generateRulePair($line, array $whiteList) |
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{ |
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$whiteList = array_map('mb_strtolower', $whiteList); |
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// Split by directive and rule |
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$pair = array_map('trim', mb_split(':', $line, 2)); |
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// Check if the line contains a rule |
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if ( |
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empty($pair[1]) || |
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empty($pair[0]) || |
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!in_array(($pair[0] = mb_strtolower($pair[0])), $whiteList) |
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) { |
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// Line does not contain any supported directive |
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return false; |
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} |
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return [ |
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'directive' => $pair[0], |
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'value' => $pair[1], |
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]; |
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} |
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/** |
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* Client rate as specified in the `Robot exclusion standard` version 2.0 draft |
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* rate = numDocuments / timeUnit |
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* @link http://www.conman.org/people/spc/robots2.html#format.directives.request-rate |
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* |
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* @param string $string |
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* @return float|int|false |
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*/ |
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private function draftParseRate($string) |
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{ |
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$parts = array_map('trim', mb_split('/', $string)); |
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if (count($parts) != 2) { |
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return false; |
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} |
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$multiplier = 1; |
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switch (mb_substr(mb_strtolower(preg_replace('/[^A-Za-z]/', '', $parts[1])), 0, 1)) { |
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case 'm': |
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$multiplier = 60; |
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break; |
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case 'h': |
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$multiplier = 3600; |
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break; |
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case 'd': |
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$multiplier = 86400; |
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break; |
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} |
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$num = floatval(preg_replace('/[^0-9]/', '', $parts[0])); |
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$sec = floatval(preg_replace('/[^0-9.]/', '', $parts[1])) * $multiplier; |
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$rate = $sec / $num; |
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return $rate > 0 ? $rate : false; |
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} |
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/** |
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* Client timestamp range as specified in the `Robot exclusion standard` version 2.0 draft |
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* @link http://www.conman.org/people/spc/robots2.html#format.directives.visit-time |
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* |
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* @param $string |
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* @return string[]|false |
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*/ |
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private function draftParseTime($string) |
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{ |
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$array = preg_replace('/[^0-9]/', '', mb_split('-', $string)); |
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if ( |
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count($array) != 2 || |
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($fromTime = date_create_from_format('Hi', $array[0], $dtz = new DateTimeZone('UTC'))) === false || |
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($toTime = date_create_from_format('Hi', $array[1], $dtz)) === false |
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) { |
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return false; |
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} |
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return [ |
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'from' => date_format($fromTime, 'Hi'), |
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'to' => date_format($toTime, 'Hi'), |
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]; |
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} |
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/** |
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* Validate directive |
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* |
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* @param string $directive |
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* @param string[] $directives |
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* @return string |
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* @throws ParserException |
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*/ |
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private function validateDirective($directive, array $directives) |
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{ |
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if (!in_array($directive, $directives, true)) { |
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throw new ParserException('Directive not supported by this class'); |
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} |
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return mb_strtolower($directive); |
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} |
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} |
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VIPnytt /
RobotsTxtParser
