MWTidy.php

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<?php
class MWTidy {
    private static $instance;

    public static function tidy( $text ) {
        $driver = self::singleton();
        if ( !$driver ) {
            throw new MWException( __METHOD__ .
                ': tidy is disabled, caller should have checked MWTidy::isEnabled()' );
        }
        return $driver->tidy( $text );
    }

    public static function checkErrors( $text, &$errorStr = null ) {
        $driver = self::singleton();
        if ( !$driver ) {
            throw new MWException( __METHOD__ .
                ': tidy is disabled, caller should have checked MWTidy::isEnabled()' );
        }
        if ( $driver->supportsValidate() ) {
            return $driver->validate( $text, $errorStr );
        } else {
            throw new MWException( __METHOD__ . ": error text return from HHVM tidy is not supported" );
        }
    }

    public static function isEnabled() {
        return self::singleton() !== false;
    }

    protected static function singleton() {
        global $wgUseTidy, $wgTidyInternal, $wgTidyConf, $wgDebugTidy, $wgTidyConfig,
            $wgTidyBin, $wgTidyOpts;

        if ( self::$instance === null ) {
            if ( $wgTidyConfig !== null ) {
                $config = $wgTidyConfig;
            } elseif ( $wgUseTidy ) {
                // b/c configuration
                $config = [
                    'tidyConfigFile' => $wgTidyConf,
                    'debugComment' => $wgDebugTidy,
                    'tidyBin' => $wgTidyBin,
                    'tidyCommandLine' => $wgTidyOpts ];
                if ( $wgTidyInternal ) {
                    if ( wfIsHHVM() ) {
                        $config['driver'] = 'RaggettInternalHHVM';
                    } else {
                        $config['driver'] = 'RaggettInternalPHP';
                    }
                } else {
                    $config['driver'] = 'RaggettExternal';
                }
            } else {
                return false;
            }
            self::$instance = self::factory( $config );
        }
        return self::$instance;
    }

    public static function factory( array $config ) {
        switch ( $config['driver'] ) {
            case 'RaggettInternalHHVM':
                $instance = new MediaWiki\Tidy\RaggettInternalHHVM( $config );
                break;
            case 'RaggettInternalPHP':
                $instance = new MediaWiki\Tidy\RaggettInternalPHP( $config );
                break;
            case 'RaggettExternal':
                $instance = new MediaWiki\Tidy\RaggettExternal( $config );
                break;
            case 'Html5Depurate':
                $instance = new MediaWiki\Tidy\Html5Depurate( $config );
                break;
            case 'Html5Internal':
                $instance = new MediaWiki\Tidy\Html5Internal( $config );
                break;
            case 'disabled':
                return false;
            default:
                throw new MWException( "Invalid tidy driver: \"{$config['driver']}\"" );
        }
        return $instance;
    }

    public static function setInstance( $instance ) {
        self::$instance = $instance;
    }

    public static function destroySingleton() {
        self::$instance = null;
    }
}