CustomDifferenceEngine.php

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<?php
 
class CustomDifferenceEngine extends DifferenceEngine {
 
    public function __construct() {
        parent::__construct();
    }
 
    public function generateContentDiffBody( Content $old, Content $new ) {
        return $old->getText() . '|' . $new->getText();
    }
 
    public function showDiffStyle() {
        $this->getOutput()->addModules( 'foo' );
    }
 
    public function getDiffBodyCacheKeyParams() {
        $params = parent::getDiffBodyCacheKeyParams();
        $params[] = 'foo';
        return $params;
    }
 
}