CssContent.php

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<?php
use MediaWiki\MediaWikiServices;

class CssContent extends TextContent {

    private $redirectTarget = false;

    public function __construct( $text, $modelId = CONTENT_MODEL_CSS ) {
        parent::__construct( $text, $modelId );
    }

    public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
        // @todo Make pre-save transformation optional for script pages

        $text = $this->getText();
        $pst = MediaWikiServices::getInstance()->getParser()
            ->preSaveTransform( $text, $title, $user, $popts );

        return new static( $pst );
    }

    protected function getHtml() {
        return Html::element( 'pre',
            [ 'class' => 'mw-code mw-css', 'dir' => 'ltr' ],
            "\n" . $this->getText() . "\n"
        ) . "\n";
    }

    public function updateRedirect( Title $target ) {
        if ( !$this->isRedirect() ) {
            return $this;
        }

        return $this->getContentHandler()->makeRedirectContent( $target );
    }

    public function getRedirectTarget() {
        if ( $this->redirectTarget !== false ) {
            return $this->redirectTarget;
        }
        $this->redirectTarget = null;
        $text = $this->getText();
        if ( strpos( $text, '/* #REDIRECT */' ) === 0 ) {
            // Extract the title from the url
            preg_match( '/title=(.*?)&action=raw/', $text, $matches );
            if ( isset( $matches[1] ) ) {
                $title = Title::newFromText( urldecode( $matches[1] ) );
                if ( $title ) {
                    // Have a title, check that the current content equals what
                    // the redirect content should be
                    if ( $this->equals( $this->getContentHandler()->makeRedirectContent( $title ) ) ) {
                        $this->redirectTarget = $title;
                    }
                }
            }
        }

        return $this->redirectTarget;
    }

}