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DeduplicateStyles.php
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DeduplicateStyles.php
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<?php
namespace MediaWiki\OutputTransform\Stages;
use MediaWiki\Html\HtmlHelper;
use MediaWiki\OutputTransform\ContentTextTransformStage;
use MediaWiki\Parser\ParserOptions;
use MediaWiki\Parser\ParserOutput;
use Wikimedia\RemexHtml\Serializer\SerializerNode;
use Wikimedia\RemexHtml\Tokenizer\PlainAttributes;
/**
* 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 = [];
$isParsoidContent = $options['isParsoidContent'] ?? false;
$transform = static function ( $fragment ) use ( &$seen, $isParsoidContent ) {
return HtmlHelper::modifyElements(
$fragment,
static function ( SerializerNode $node ): bool {
return $node->name === 'style' &&
( $node->attrs['data-mw-deduplicate'] ?? '' ) !== '';
},
static function ( SerializerNode $node ) use ( &$seen ): SerializerNode {
$key = $node->attrs['data-mw-deduplicate'];
if ( !isset( $seen[$key] ) ) {
$seen[$key] = true;
return $node;
}
// 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.
$node->name = 'link';
$node->attrs = new PlainAttributes( [
'rel' => 'mw-deduplicated-inline-style',
'href' => "mw-data:" . wfUrlencode( $key ),
] );
$node->children = [];
$node->void = true;
return $node;
},
$isParsoidContent
);
};
if ( !$isParsoidContent ) {
// Optimization: Only transform possible style nodes to avoid having to tokenize the entire output,
// which is expensive for large pages (T394059).
// This is unsafe to do for Parsoid content, since the naïve regex below might match encoded style
// tags within data-parsoid attribute values, so only apply it to legacy parser output.
// Parsoid content transformations will be further optimized in T394005.
return preg_replace_callback(
'#<style\s+([^>]*data-mw-deduplicate\s*=[\'"][^>]*)>.*?</style>#s',
static fn ( array $matches ) => $transform( $matches[0] ),
$text
);
}
return $transform( $text );
}
}

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text/x-php
Expires
Oct 4 2026, 20:20 (5 w, 5 d ago)
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local-disk
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85/9f/fe6c99eec5fa355ffb18a76a7f0d
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DeduplicateStyles.php (2 KB)

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