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<?php |
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declare(strict_types = 1); |
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namespace BrowscapPHP\Parser\Helper; |
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/** |
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* includes general functions for the work with patterns |
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*/ |
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final class Pattern |
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{ |
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private function __construct() |
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{ |
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} |
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/** |
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* Gets a hash or an array of hashes from the first characters of a pattern/user agent, that can |
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* be used for a fast comparison, by comparing only the hashes, without having to match the |
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* complete pattern against the user agent. |
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* |
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* With the variants options, all variants from the maximum number of pattern characters to one |
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* character will be returned. This is required in some cases, the a placeholder is used very |
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* early in the pattern. |
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* |
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* Example: |
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* |
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* Pattern: "Mozilla/* (Nintendo 3DS; *) Version/*" |
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* User agent: "Mozilla/5.0 (Nintendo 3DS; U; ; en) Version/1.7567.US" |
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* |
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* In this case the has for the pattern is created for "Mozilla/" while the pattern |
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* for the hash for user agent is created for "Mozilla/5.0". The variants option |
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* results in an array with hashes for "Mozilla/5.0", "Mozilla/5.", "Mozilla/5", |
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* "Mozilla/" ... "M", so that the pattern hash is included. |
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* |
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* @param string $pattern |
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* @param bool $variants |
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* @return string[] |
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*/ |
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public static function getHashForPattern(string $pattern, bool $variants = false) : array |
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{ |
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$regex = '/^([^\.\*\?\s\r\n\\\\]+).*$/'; |
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$pattern = substr($pattern, 0, 32); |
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$matches = []; |
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if (! preg_match($regex, $pattern, $matches) || ! isset($matches[1])) { |
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return [md5('')]; |
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} |
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$string = $matches[1]; |
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if (true === $variants) { |
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$patternStarts = []; |
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1 |
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for ($i = strlen($string); $i >= 1; --$i) { |
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$string = substr($string, 0, $i); |
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1 |
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$patternStarts[] = md5($string); |
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} |
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// Add empty pattern start to include patterns that start with "*", |
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// e.g. "*FAST Enterprise Crawler*" |
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1 |
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$patternStarts[] = md5(''); |
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1 |
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return $patternStarts; |
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} |
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1 |
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return [md5($string)]; |
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} |
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/** |
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* returns a hash for one pattern |
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* |
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* @param $pattern |
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* |
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* @return string |
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*/ |
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1 |
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public static function getHashForParts(string $pattern) : string |
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{ |
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return md5($pattern); |
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} |
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/** |
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* Gets the minimum length of the patern (used in the getPatterns() method to |
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* check against the user agent length) |
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* |
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* @param string $pattern |
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* @return int |
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*/ |
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1 |
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public static function getPatternLength(string $pattern) : int |
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{ |
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return strlen(str_replace('*', '', $pattern)); |
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} |
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} |
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browscap /
browscap-php
