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<?php |
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namespace dokuwiki\Search; |
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use dokuwiki\Extension\Event; |
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use dokuwiki\Utf8; |
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// set the minimum token length to use in the index |
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// (note, this doesn't apply to numeric tokens) |
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const MINWORDLENGTH = 2; |
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/** |
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* DokuWiki Tokenizer class |
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*/ |
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class Tokenizer |
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{ |
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/** @var array $Stopwords Words that tokenizer ignores */ |
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protected static $Stopwords; |
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/** @var int $MinWordLength minimum token length */ |
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protected static $MinWordLength; |
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/** |
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* Returns words that will be ignored |
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* |
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* @return array list of stop words |
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* |
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* @author Tom N Harris <[email protected]> |
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*/ |
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public static function getStopwords() |
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{ |
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if (!isset(static::$Stopwords)) { |
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global $conf; |
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$swFile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt'; |
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if (file_exists($swFile)) { |
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static::$Stopwords = file($swFile, FILE_IGNORE_NEW_LINES); |
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} else { |
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static::$Stopwords = array(); |
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} |
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} |
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return static::$Stopwords; |
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} |
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/** |
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* Returns minimum word length to be used in the index |
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* |
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* @return int |
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*/ |
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public static function getMinWordLength() |
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{ |
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if (!isset(static::$MinWordLength)) { |
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// set the minimum token length to use in the index |
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// (note, this doesn't apply to numeric tokens) |
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static::$MinWordLength = (defined('IDX_MINWORDLENGTH')) |
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? IDX_MINWORDLENGTH |
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: MINWORDLENGTH; |
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} |
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return static::$MinWordLength; |
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} |
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/** |
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* Split the text into words for fulltext search |
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* |
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* @triggers INDEXER_TEXT_PREPARE |
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* This event allows plugins to modify the text before it gets tokenized. |
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* Plugins intercepting this event should also intercept INDEX_VERSION_GET |
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* |
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* @param string $text plain text |
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* @param bool $wc are wildcards allowed? |
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* @return array list of words in the text |
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* |
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* @author Tom N Harris <[email protected]> |
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* @author Andreas Gohr <[email protected]> |
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*/ |
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public static function getWords($text, $wc = false) |
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{ |
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$wc = ($wc) ? '' : '\*'; |
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// prepare the text to be tokenized |
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$event = new Event('INDEXER_TEXT_PREPARE', $text); |
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if ($event->advise_before(true)) { |
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if (preg_match('/[^0-9A-Za-z ]/u', $text)) { |
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$text = Utf8\Asian::separateAsianWords($text); |
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} |
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} |
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$event->advise_after(); |
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unset($event); |
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$text = strtr($text, array( |
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"\r" => ' ', |
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"\n" => ' ', |
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"\t" => ' ', |
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"\xC2\xAD" => '', //soft-hyphen |
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)); |
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if (preg_match('/[^0-9A-Za-z ]/u', $text)) { |
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$text = Utf8\Clean::stripspecials($text, ' ', '\._\-:'.$wc); |
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} |
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$wordlist = explode(' ', $text); |
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foreach ($wordlist as $i => $word) { |
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$wordlist[$i] = (preg_match('/[^0-9A-Za-z]/u', $word)) ? |
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Utf8\PhpString::strtolower($word) : strtolower($word); |
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} |
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foreach ($wordlist as $i => $word) { |
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if ((!is_numeric($word) && strlen($word) < static::getMinWordLength()) |
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|| array_search($word, static::getStopwords(), true) !== false) { |
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unset($wordlist[$i]); |
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} |
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} |
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return array_values($wordlist); |
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} |
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} |
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splitbrain /
dokuwiki
