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<?php
/**
* Description2 – Adds meaningful description <meta> tag to MW pages and into the parser output
*
* @file
* @ingroup Extensions
* @author Daniel Friesen (http://danf.ca/mw/)
* @copyright Copyright 2010 – Daniel Friesen
* @license https://www.gnu.org/copyleft/gpl.html GNU General Public License 2.0 or later
* @link https://www.mediawiki.org/wiki/Extension:Description2 Documentation
*/
class Description2 {
/**
* @param Parser $parser
* @param string $desc
*/
public static function setDescription( Parser $parser, $desc ) {
$parserOutput = $parser->getOutput();
if ( $parserOutput->getProperty( 'description' ) !== false ) {
return;
}
$parserOutput->setProperty( 'description', $desc );
}
/**
* @param Parser $parser
* @param string $text
* @return bool
*/
public static function onParserAfterTidy( Parser &$parser, &$text ) {
$desc = '';
$myText = preg_replace( '%<table\b[^>]*+>(?:(?R)|[^<]*+(?:(?!</?table\b)<[^<]*+)*+)*+</table>%i', '', $text );
$paragraphs = array();
if ( preg_match_all( '#<p>.*?</p>#is', $myText, $paragraphs ) ) {
foreach ( $paragraphs[0] as $paragraph ) {
$paragraph = trim( strip_tags( $paragraph ) );
if ( !$paragraph ) {
continue;
}
$desc = $paragraph;
break;
}
}
if ( $desc ) {
self::setDescription( $parser, $desc );
}
return true;
}
/**
* @param Parser $parser
* @return bool
*/
public static function onParserFirstCallInit( Parser &$parser ) {
global $wgEnableMetaDescriptionFunctions;
if ( !$wgEnableMetaDescriptionFunctions ) {
// Functions and tags are disabled
return true;
}
$parser->setFunctionHook( 'description2', array( 'Description2', 'parserFunctionCallback' ), Parser::SFH_OBJECT_ARGS );
$parser->setFunctionTagHook( 'metadesc', array( 'Description2', 'tagCallback' ), Parser::SFH_OBJECT_ARGS );
return true;
}
/**
* @param Parser $parser
* @param $frame
* @param $args
* @return string
*/
public static function parserFunctionCallback( Parser $parser, $frame, $args ) {
$desc = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
self::setDescription( $parser, $desc );
return '';
}
/**
* @param Parser $parser
* @param $frame
* @param $content
* @param $attributes
* @return string
*/
public static function tagCallback( Parser $parser, $frame, $content, $attributes ) {
$desc = ( isset( $content ) ? $content : ( isset( $attributes['content'] ) ? $attributes['content'] : null ) );
if ( isset( $desc ) ) {
self::setDescription( $parser, $desc );
}
return '';
}
public static function onOutputPageParserOutput( OutputPage &$out, ParserOutput $parserOutput ) {
// Export the description from the main parser output into the OutputPage
$description = $parserOutput->getProperty( 'description' );
if ( $description !== false ) {
$out->addMeta( 'description', $description );
}
}
}
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