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<?php
namespace MediaWiki\OutputTransform\Stages;
use MediaWiki\Html\Html;
use MediaWiki\OutputTransform\ContentTextTransformStage;
use MediaWiki\Parser\ParserOptions;
use MediaWiki\Parser\ParserOutput;
use MediaWiki\Parser\Sanitizer;
/**
* Generates a list of unique style links
* @internal
*/
class DeduplicateStyles extends ContentTextTransformStage {
public function shouldRun( ParserOutput $po, ?ParserOptions $popts, array $options = [] ): bool {
return $options['deduplicateStyles'] ?? true;
}
protected function transformText( string $text, ParserOutput $po, ?ParserOptions $popts, array &$options ): string {
$seen = [];
return preg_replace_callback( '#<style\s+([^>]*data-mw-deduplicate\s*=[\'"][^>]*)>.*?</style>#s',
static function ( $m ) use ( &$seen ) {
$attr = Sanitizer::decodeTagAttributes( $m[1] );
if ( !isset( $attr['data-mw-deduplicate'] ) ) {
return $m[0];
}
$key = $attr['data-mw-deduplicate'];
if ( !isset( $seen[$key] ) ) {
$seen[$key] = true;
return $m[0];
}
// We were going to use an empty <style> here, but there
// was concern that would be too much overhead for browsers.
// So let's hope a <link> with a non-standard rel and href isn't
// going to be misinterpreted or mangled by any subsequent processing.
return Html::element( 'link', [
'rel' => 'mw-deduplicated-inline-style',
'href' => "mw-data:" . wfUrlencode( $key ),
] );
}, $text );
}
}