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<?php namespace MediaWiki\Extension\TextExtracts; use MediaWiki\MediaWikiServices; /** * This class needs to understand HTML as well as plain text. It tries to not break HTML tags, but * might break pairs of tags, leaving unclosed tags behind. We can tidy the output to fix * this. * * @license GPL-2.0-or-later */ class TextTruncator { /** * @var bool Whether to tidy the output */ private $useTidy; /** * @param bool $useTidy */ public function __construct( bool $useTidy ) { $this->useTidy = $useTidy; } /** * Returns no more than the given number of sentences * * @param string $text Source text to extract from * @param int $requestedSentenceCount Maximum number of sentences to extract * @return string */ public function getFirstSentences( $text, $requestedSentenceCount ) { if ( $requestedSentenceCount <= 0 ) { return ''; } // Based on code from OpenSearchXml by Brion Vibber $endchars = [ // regular ASCII '\P{Lu}\.(?=[ \n]|$)', '[!?](?=[ \n]|$)', // full-width ideographic full-stop '。', // double-width roman forms '．', '！', '？', // half-width ideographic full stop '｡', ]; $regexp = '/(?:' . implode( '|', $endchars ) . ')+/u'; $res = preg_match_all( $regexp, $text, $matches, PREG_OFFSET_CAPTURE ); if ( !$res ) { // Just return the first line $lines = explode( "\n", $text, 2 ); return trim( $lines[0] ); } $index = min( $requestedSentenceCount, $res ) - 1; [ $tail, $length ] = $matches[0][$index]; // PCRE returns raw offsets, so using substr() instead of mb_substr() $text = substr( $text, 0, $length ) . $tail; return $this->tidy( $text ); } /** * Returns no more than a requested number of characters, preserving words * * @param string $text Source text to extract from * @param int $requestedLength Maximum number of characters to return * @return string */ public function getFirstChars( $text, $requestedLength ) { if ( $requestedLength <= 0 ) { return ''; } $length = mb_strlen( $text ); if ( $length <= $requestedLength ) { return $text; } // This ungreedy pattern always matches, just might return an empty string $pattern = '/^[\w\/]*>?/su'; preg_match( $pattern, mb_substr( $text, $requestedLength ), $m ); $truncatedText = mb_substr( $text, 0, $requestedLength ) . $m[0]; if ( $truncatedText === $text ) { return $text; } return $this->tidy( $truncatedText ); } /** * @param string $text * @return string */ private function tidy( $text ) { if ( $this->useTidy ) { $text = MediaWikiServices::getInstance()->getTidy()->tidy( $text ); } return trim( $text ); } }
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