DifferenceEngineSlotDiffRenderer.php

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<?php
class DifferenceEngineSlotDiffRenderer extends SlotDiffRenderer {

    private $differenceEngine;

    public function __construct( DifferenceEngine $differenceEngine ) {
        $this->differenceEngine = clone $differenceEngine;

        // Set state to loaded. This should not matter to any of the methods invoked by
        // the adapter, but just in case a load does get triggered somehow, make sure it's a no-op.
        $fakeContent = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT )->makeEmptyContent();
        $this->differenceEngine->setContent( $fakeContent, $fakeContent );

        $this->differenceEngine->markAsSlotDiffRenderer();
    }

    public function getDiff( Content $oldContent = null, Content $newContent = null ) {
        $this->normalizeContents( $oldContent, $newContent );
        return $this->differenceEngine->generateContentDiffBody( $oldContent, $newContent );
    }

    public function addModules( OutputPage $output ) {
        $oldContext = null;
        if ( $output !== $this->differenceEngine->getOutput() ) {
            $oldContext = $this->differenceEngine->getContext();
            $newContext = new DerivativeContext( $oldContext );
            $newContext->setOutput( $output );
            $this->differenceEngine->setContext( $newContext );
        }
        $this->differenceEngine->showDiffStyle();
        if ( $oldContext ) {
            $this->differenceEngine->setContext( $oldContext );
        }
    }

    public function getExtraCacheKeys() {
        return $this->differenceEngine->getExtraCacheKeys();
    }

}