JsonContent.php

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<?php
class JsonContent extends TextContent {

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

    public function getJsonData() {
        return FormatJson::decode( $this->getNativeData(), true );
    }

    public function isValid() {
        return $this->getJsonData() !== null;
    }

    public function beautifyJSON() {
        $decoded = FormatJson::decode( $this->getNativeData(), true );
        if ( !is_array( $decoded ) ) {
            return null;
        }
        return FormatJson::encode( $decoded, true );

    }

    public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
        return new static( $this->beautifyJSON() );
    }

    protected function fillParserOutput( Title $title, $revId,
        ParserOptions $options, $generateHtml, ParserOutput &$output
    ) {
        if ( $generateHtml ) {
            $output->setText( $this->objectTable( $this->getJsonData() ) );
            $output->addModuleStyles( 'mediawiki.content.json' );
        } else {
            $output->setText( '' );
        }
    }
    protected function objectTable( $mapping ) {
        $rows = array();

        foreach ( $mapping as $key => $val ) {
            $rows[] = $this->objectRow( $key, $val );
        }
        return Xml::tags( 'table', array( 'class' => 'mw-json' ),
            Xml::tags( 'tbody', array(), join( "\n", $rows ) )
        );
    }

    protected function objectRow( $key, $val ) {
        $th = Xml::elementClean( 'th', array(), $key );
        if ( is_array( $val ) ) {
            $td = Xml::tags( 'td', array(), self::objectTable( $val ) );
        } else {
            if ( is_string( $val ) ) {
                $val = '"' . $val . '"';
            } else {
                $val = FormatJson::encode( $val );
            }

            $td = Xml::elementClean( 'td', array( 'class' => 'value' ), $val );
        }

        return Xml::tags( 'tr', array(), $th . $td );
    }

}