parserTest.inc

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<?php
class ParserTest {
    private $color;

    private $showOutput;

    private $useTemporaryTables = true;

    private $databaseSetupDone = false;

    private $db;

    private $dbClone;

    private $djVuSupport;

    private $tidySupport;

    private $maxFuzzTestLength = 300;
    private $fuzzSeed = 0;
    private $memoryLimit = 50;
    private $uploadDir = null;

    public $regex = "";
    private $savedGlobals = array();

    public function __construct( $options = array() ) {
        # Only colorize output if stdout is a terminal.
        $this->color = !wfIsWindows() && Maintenance::posix_isatty( 1 );

        if ( isset( $options['color'] ) ) {
            switch ( $options['color'] ) {
                case 'no':
                    $this->color = false;
                    break;
                case 'yes':
                default:
                    $this->color = true;
                    break;
            }
        }

        $this->term = $this->color
            ? new AnsiTermColorer()
            : new DummyTermColorer();

        $this->showDiffs = !isset( $options['quick'] );
        $this->showProgress = !isset( $options['quiet'] );
        $this->showFailure = !(
            isset( $options['quiet'] )
                && ( isset( $options['record'] )
                || isset( $options['compare'] ) ) ); // redundant output

        $this->showOutput = isset( $options['show-output'] );

        if ( isset( $options['filter'] ) ) {
            $options['regex'] = $options['filter'];
        }

        if ( isset( $options['regex'] ) ) {
            if ( isset( $options['record'] ) ) {
                echo "Warning: --record cannot be used with --regex, disabling --record\n";
                unset( $options['record'] );
            }
            $this->regex = $options['regex'];
        } else {
            # Matches anything
            $this->regex = '';
        }

        $this->setupRecorder( $options );
        $this->keepUploads = isset( $options['keep-uploads'] );

        if ( isset( $options['seed'] ) ) {
            $this->fuzzSeed = intval( $options['seed'] ) - 1;
        }

        $this->runDisabled = isset( $options['run-disabled'] );
        $this->runParsoid = isset( $options['run-parsoid'] );

        $this->djVuSupport = new DjVuSupport();
        $this->tidySupport = new TidySupport();
        if ( !$this->tidySupport->isEnabled() ) {
            echo "Warning: tidy is not installed, skipping some tests\n";
        }

        $this->hooks = array();
        $this->functionHooks = array();
        $this->transparentHooks = array();
        self::setUp();
    }

    static function setUp() {
        global $wgParser, $wgParserConf, $IP, $messageMemc, $wgMemc,
            $wgUser, $wgLang, $wgOut, $wgRequest, $wgStyleDirectory, $wgEnableParserCache,
            $wgExtraNamespaces, $wgNamespaceAliases, $wgNamespaceProtection, $wgLocalFileRepo,
            $wgExtraInterlanguageLinkPrefixes, $wgLocalInterwikis,
            $parserMemc, $wgThumbnailScriptPath, $wgScriptPath,
            $wgArticlePath, $wgScript, $wgStylePath, $wgExtensionAssetsPath,
            $wgMainCacheType, $wgMessageCacheType, $wgParserCacheType, $wgLockManagers;

        $wgScript = '/index.php';
        $wgScriptPath = '/';
        $wgArticlePath = '/wiki/$1';
        $wgStylePath = '/skins';
        $wgExtensionAssetsPath = '/extensions';
        $wgThumbnailScriptPath = false;
        $wgLockManagers = array( array(
            'name' => 'fsLockManager',
            'class' => 'FSLockManager',
            'lockDirectory' => wfTempDir() . '/test-repo/lockdir',
        ), array(
            'name' => 'nullLockManager',
            'class' => 'NullLockManager',
        ) );
        $wgLocalFileRepo = array(
            'class' => 'LocalRepo',
            'name' => 'local',
            'url' => 'http://example.com/images',
            'hashLevels' => 2,
            'transformVia404' => false,
            'backend' => new FSFileBackend( array(
                'name' => 'local-backend',
                'wikiId' => wfWikiId(),
                'containerPaths' => array(
                    'local-public' => wfTempDir() . '/test-repo/public',
                    'local-thumb' => wfTempDir() . '/test-repo/thumb',
                    'local-temp' => wfTempDir() . '/test-repo/temp',
                    'local-deleted' => wfTempDir() . '/test-repo/deleted',
                )
            ) )
        );
        $wgNamespaceProtection[NS_MEDIAWIKI] = 'editinterface';
        $wgNamespaceAliases['Image'] = NS_FILE;
        $wgNamespaceAliases['Image_talk'] = NS_FILE_TALK;
        # add a namespace shadowing a interwiki link, to test
        # proper precedence when resolving links. (bug 51680)
        $wgExtraNamespaces[100] = 'MemoryAlpha';

        // XXX: tests won't run without this (for CACHE_DB)
        if ( $wgMainCacheType === CACHE_DB ) {
            $wgMainCacheType = CACHE_NONE;
        }
        if ( $wgMessageCacheType === CACHE_DB ) {
            $wgMessageCacheType = CACHE_NONE;
        }
        if ( $wgParserCacheType === CACHE_DB ) {
            $wgParserCacheType = CACHE_NONE;
        }

        $wgEnableParserCache = false;
        DeferredUpdates::clearPendingUpdates();
        $wgMemc = wfGetMainCache(); // checks $wgMainCacheType
        $messageMemc = wfGetMessageCacheStorage();
        $parserMemc = wfGetParserCacheStorage();

        $wgUser = new User;
        $context = new RequestContext;
        $wgLang = $context->getLanguage();
        $wgOut = $context->getOutput();
        $wgParser = new StubObject( 'wgParser', $wgParserConf['class'], array( $wgParserConf ) );
        $wgRequest = $context->getRequest();

        if ( $wgStyleDirectory === false ) {
            $wgStyleDirectory = "$IP/skins";
        }

        self::setupInterwikis();
        $wgLocalInterwikis = array( 'local', 'mi' );
        // "extra language links"
        // see https://gerrit.wikimedia.org/r/111390
        array_push( $wgExtraInterlanguageLinkPrefixes, 'mul' );
    }

    public static function setupInterwikis() {
        # Hack: insert a few Wikipedia in-project interwiki prefixes,
        # for testing inter-language links
        Hooks::register( 'InterwikiLoadPrefix', function ( $prefix, &$iwData ) {
            static $testInterwikis = array(
                'local' => array(
                    'iw_url' => 'http://doesnt.matter.org/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 0 ),
                'wikipedia' => array(
                    'iw_url' => 'http://en.wikipedia.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 0 ),
                'meatball' => array(
                    'iw_url' => 'http://www.usemod.com/cgi-bin/mb.pl?$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 0 ),
                'memoryalpha' => array(
                    'iw_url' => 'http://www.memory-alpha.org/en/index.php/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 0 ),
                'zh' => array(
                    'iw_url' => 'http://zh.wikipedia.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 1 ),
                'es' => array(
                    'iw_url' => 'http://es.wikipedia.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 1 ),
                'fr' => array(
                    'iw_url' => 'http://fr.wikipedia.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 1 ),
                'ru' => array(
                    'iw_url' => 'http://ru.wikipedia.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 1 ),
                'mi' => array(
                    'iw_url' => 'http://mi.wikipedia.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 1 ),
                'mul' => array(
                    'iw_url' => 'http://wikisource.org/wiki/$1',
                    'iw_api' => '',
                    'iw_wikiid' => '',
                    'iw_local' => 1 ),
            );
            if ( array_key_exists( $prefix, $testInterwikis ) ) {
                $iwData = $testInterwikis[$prefix];
            }

            // We only want to rely on the above fixtures
            return false;
        } );// hooks::register
    }

    public static function tearDownInterwikis() {
        Hooks::clear( 'InterwikiLoadPrefix' );
    }

    public function setupRecorder( $options ) {
        if ( isset( $options['record'] ) ) {
            $this->recorder = new DbTestRecorder( $this );
            $this->recorder->version = isset( $options['setversion'] ) ?
                $options['setversion'] : SpecialVersion::getVersion();
        } elseif ( isset( $options['compare'] ) ) {
            $this->recorder = new DbTestPreviewer( $this );
        } else {
            $this->recorder = new TestRecorder( $this );
        }
    }

    public static function chomp( $s ) {
        if ( substr( $s, -1 ) === "\n" ) {
            return substr( $s, 0, -1 );
        } else {
            return $s;
        }
    }

    function fuzzTest( $filenames ) {
        $GLOBALS['wgContLang'] = Language::factory( 'en' );
        $dict = $this->getFuzzInput( $filenames );
        $dictSize = strlen( $dict );
        $logMaxLength = log( $this->maxFuzzTestLength );
        $this->setupDatabase();
        ini_set( 'memory_limit', $this->memoryLimit * 1048576 );

        $numTotal = 0;
        $numSuccess = 0;
        $user = new User;
        $opts = ParserOptions::newFromUser( $user );
        $title = Title::makeTitle( NS_MAIN, 'Parser_test' );

        while ( true ) {
            // Generate test input
            mt_srand( ++$this->fuzzSeed );
            $totalLength = mt_rand( 1, $this->maxFuzzTestLength );
            $input = '';

            while ( strlen( $input ) < $totalLength ) {
                $logHairLength = mt_rand( 0, 1000000 ) / 1000000 * $logMaxLength;
                $hairLength = min( intval( exp( $logHairLength ) ), $dictSize );
                $offset = mt_rand( 0, $dictSize - $hairLength );
                $input .= substr( $dict, $offset, $hairLength );
            }

            $this->setupGlobals();
            $parser = $this->getParser();

            // Run the test
            try {
                $parser->parse( $input, $title, $opts );
                $fail = false;
            } catch ( Exception $exception ) {
                $fail = true;
            }

            if ( $fail ) {
                echo "Test failed with seed {$this->fuzzSeed}\n";
                echo "Input:\n";
                printf( "string(%d) \"%s\"\n\n", strlen( $input ), $input );
                echo "$exception\n";
            } else {
                $numSuccess++;
            }

            $numTotal++;
            $this->teardownGlobals();
            $parser->__destruct();

            if ( $numTotal % 100 == 0 ) {
                $usage = intval( memory_get_usage( true ) / $this->memoryLimit / 1048576 * 100 );
                echo "{$this->fuzzSeed}: $numSuccess/$numTotal (mem: $usage%)\n";
                if ( $usage > 90 ) {
                    echo "Out of memory:\n";
                    $memStats = $this->getMemoryBreakdown();

                    foreach ( $memStats as $name => $usage ) {
                        echo "$name: $usage\n";
                    }
                    $this->abort();
                }
            }
        }
    }

    function getFuzzInput( $filenames ) {
        $dict = '';

        foreach ( $filenames as $filename ) {
            $contents = file_get_contents( $filename );
            preg_match_all(
                '/!!\s*(input|wikitext)\n(.*?)\n!!\s*(result|html|html\/\*|html\/php)/s',
                $contents,
                $matches
            );

            foreach ( $matches[1] as $match ) {
                $dict .= $match . "\n";
            }
        }

        return $dict;
    }

    function getMemoryBreakdown() {
        $memStats = array();

        foreach ( $GLOBALS as $name => $value ) {
            $memStats['$' . $name] = strlen( serialize( $value ) );
        }

        $classes = get_declared_classes();

        foreach ( $classes as $class ) {
            $rc = new ReflectionClass( $class );
            $props = $rc->getStaticProperties();
            $memStats[$class] = strlen( serialize( $props ) );
            $methods = $rc->getMethods();

            foreach ( $methods as $method ) {
                $memStats[$class] += strlen( serialize( $method->getStaticVariables() ) );
            }
        }

        $functions = get_defined_functions();

        foreach ( $functions['user'] as $function ) {
            $rf = new ReflectionFunction( $function );
            $memStats["$function()"] = strlen( serialize( $rf->getStaticVariables() ) );
        }

        asort( $memStats );

        return $memStats;
    }

    function abort() {
        $this->abort();
    }

    public function runTestsFromFiles( $filenames ) {
        $ok = false;

        // be sure, ParserTest::addArticle has correct language set,
        // so that system messages gets into the right language cache
        $GLOBALS['wgLanguageCode'] = 'en';
        $GLOBALS['wgContLang'] = Language::factory( 'en' );

        $this->recorder->start();
        try {
            $this->setupDatabase();
            $ok = true;

            foreach ( $filenames as $filename ) {
                $tests = new TestFileIterator( $filename, $this );
                $ok = $this->runTests( $tests ) && $ok;
            }

            $this->teardownDatabase();
            $this->recorder->report();
        } catch ( DBError $e ) {
            echo $e->getMessage();
        }
        $this->recorder->end();

        return $ok;
    }

    function runTests( $tests ) {
        $ok = true;

        foreach ( $tests as $t ) {
            $result =
                $this->runTest( $t['test'], $t['input'], $t['result'], $t['options'], $t['config'] );
            $ok = $ok && $result;
            $this->recorder->record( $t['test'], $result );
        }

        if ( $this->showProgress ) {
            print "\n";
        }

        return $ok;
    }

    function getParser( $preprocessor = null ) {
        global $wgParserConf;

        $class = $wgParserConf['class'];
        $parser = new $class( array( 'preprocessorClass' => $preprocessor ) + $wgParserConf );

        foreach ( $this->hooks as $tag => $callback ) {
            $parser->setHook( $tag, $callback );
        }

        foreach ( $this->functionHooks as $tag => $bits ) {
            list( $callback, $flags ) = $bits;
            $parser->setFunctionHook( $tag, $callback, $flags );
        }

        foreach ( $this->transparentHooks as $tag => $callback ) {
            $parser->setTransparentTagHook( $tag, $callback );
        }

        wfRunHooks( 'ParserTestParser', array( &$parser ) );

        return $parser;
    }

    public function runTest( $desc, $input, $result, $opts, $config ) {
        if ( $this->showProgress ) {
            $this->showTesting( $desc );
        }

        $opts = $this->parseOptions( $opts );
        $context = $this->setupGlobals( $opts, $config );

        $user = $context->getUser();
        $options = ParserOptions::newFromContext( $context );

        if ( isset( $opts['djvu'] ) ) {
            if ( !$this->djVuSupport->isEnabled() ) {
                return $this->showSkipped();
            }
        }

        if ( isset( $opts['title'] ) ) {
            $titleText = $opts['title'];
        } else {
            $titleText = 'Parser test';
        }

        $local = isset( $opts['local'] );
        $preprocessor = isset( $opts['preprocessor'] ) ? $opts['preprocessor'] : null;
        $parser = $this->getParser( $preprocessor );
        $title = Title::newFromText( $titleText );

        if ( isset( $opts['pst'] ) ) {
            $out = $parser->preSaveTransform( $input, $title, $user, $options );
        } elseif ( isset( $opts['msg'] ) ) {
            $out = $parser->transformMsg( $input, $options, $title );
        } elseif ( isset( $opts['section'] ) ) {
            $section = $opts['section'];
            $out = $parser->getSection( $input, $section );
        } elseif ( isset( $opts['replace'] ) ) {
            $section = $opts['replace'][0];
            $replace = $opts['replace'][1];
            $out = $parser->replaceSection( $input, $section, $replace );
        } elseif ( isset( $opts['comment'] ) ) {
            $out = Linker::formatComment( $input, $title, $local );
        } elseif ( isset( $opts['preload'] ) ) {
            $out = $parser->getPreloadText( $input, $title, $options );
        } else {
            $output = $parser->parse( $input, $title, $options, true, true, 1337 );
            $output->setTOCEnabled( !isset( $opts['notoc'] ) );
            $out = $output->getText();
            if ( isset( $opts['tidy'] ) ) {
                if ( !$this->tidySupport->isEnabled() ) {
                    return $this->showSkipped();
                }
                $out = MWTidy::tidy( $out );
                $out = preg_replace( '/\s+$/', '', $out );
            }

            if ( isset( $opts['showtitle'] ) ) {
                if ( $output->getTitleText() ) {
                    $title = $output->getTitleText();
                }

                $out = "$title\n$out";
            }

            if ( isset( $opts['ill'] ) ) {
                $out = implode( ' ', $output->getLanguageLinks() );
            } elseif ( isset( $opts['cat'] ) ) {
                $outputPage = $context->getOutput();
                $outputPage->addCategoryLinks( $output->getCategories() );
                $cats = $outputPage->getCategoryLinks();

                if ( isset( $cats['normal'] ) ) {
                    $out = implode( ' ', $cats['normal'] );
                } else {
                    $out = '';
                }
            }
        }

        $this->teardownGlobals();

        $testResult = new ParserTestResult( $desc );
        $testResult->expected = $result;
        $testResult->actual = $out;

        return $this->showTestResult( $testResult );
    }

    function showTestResult( ParserTestResult $testResult ) {
        if ( $testResult->isSuccess() ) {
            $this->showSuccess( $testResult );
            return true;
        } else {
            $this->showFailure( $testResult );
            return false;
        }
    }

    private static function getOptionValue( $key, $opts, $default ) {
        $key = strtolower( $key );

        if ( isset( $opts[$key] ) ) {
            return $opts[$key];
        } else {
            return $default;
        }
    }

    private function parseOptions( $instring ) {
        $opts = array();
        // foo
        // foo=bar
        // foo="bar baz"
        // foo=[[bar baz]]
        // foo=bar,"baz quux"
        // foo={...json...}
        $defs = '(?(DEFINE)
            (?<qstr>                    # Quoted string
                "
                (?:[^\\\\"] | \\\\.)*
                "
            )
            (?<json>
                \{      # Open bracket
                (?:
                    [^"{}] |                # Not a quoted string or object, or
                    (?&qstr) |              # A quoted string, or
                    (?&json)                # A json object (recursively)
                )*
                \}      # Close bracket
            )
            (?<value>
                (?:
                    (?&qstr)            # Quoted val
                |
                    \[\[
                        [^]]*           # Link target
                    \]\]
                |
                    [\w-]+              # Plain word
                |
                    (?&json)            # JSON object
                )
            )
        )';
        $regex = '/' . $defs . '\b
            (?<k>[\w-]+)                # Key
            \b
            (?:\s*
                =                       # First sub-value
                \s*
                (?<v>
                    (?&value)
                    (?:\s*
                        ,               # Sub-vals 1..N
                        \s*
                        (?&value)
                    )*
                )
            )?
            /x';
        $valueregex = '/' . $defs . '(?&value)/x';

        if ( preg_match_all( $regex, $instring, $matches, PREG_SET_ORDER ) ) {
            foreach ( $matches as $bits ) {
                $key = strtolower( $bits['k'] );
                if ( !isset( $bits['v'] ) ) {
                    $opts[$key] = true;
                } else {
                    preg_match_all( $valueregex, $bits['v'], $vmatches );
                    $opts[$key] = array_map( array( $this, 'cleanupOption' ), $vmatches[0] );
                    if ( count( $opts[$key] ) == 1 ) {
                        $opts[$key] = $opts[$key][0];
                    }
                }
            }
        }
        return $opts;
    }

    private function cleanupOption( $opt ) {
        if ( substr( $opt, 0, 1 ) == '"' ) {
            return stripcslashes( substr( $opt, 1, -1 ) );
        }

        if ( substr( $opt, 0, 2 ) == '[[' ) {
            return substr( $opt, 2, -2 );
        }

        if ( substr( $opt, 0, 1 ) == '{' ) {
            return FormatJson::decode( $opt, true );
        }
        return $opt;
    }

    private function setupGlobals( $opts = '', $config = '' ) {
        global $IP;

        # Find out values for some special options.
        $lang =
            self::getOptionValue( 'language', $opts, 'en' );
        $variant =
            self::getOptionValue( 'variant', $opts, false );
        $maxtoclevel =
            self::getOptionValue( 'wgMaxTocLevel', $opts, 999 );
        $linkHolderBatchSize =
            self::getOptionValue( 'wgLinkHolderBatchSize', $opts, 1000 );

        $settings = array(
            'wgServer' => 'http://example.org',
            'wgServerName' => 'example.org',
            'wgScript' => '/index.php',
            'wgScriptPath' => '/',
            'wgArticlePath' => '/wiki/$1',
            'wgActionPaths' => array(),
            'wgLockManagers' => array( array(
                'name' => 'fsLockManager',
                'class' => 'FSLockManager',
                'lockDirectory' => $this->uploadDir . '/lockdir',
            ), array(
                'name' => 'nullLockManager',
                'class' => 'NullLockManager',
            ) ),
            'wgLocalFileRepo' => array(
                'class' => 'LocalRepo',
                'name' => 'local',
                'url' => 'http://example.com/images',
                'hashLevels' => 2,
                'transformVia404' => false,
                'backend' => new FSFileBackend( array(
                    'name' => 'local-backend',
                    'wikiId' => wfWikiId(),
                    'containerPaths' => array(
                        'local-public' => $this->uploadDir,
                        'local-thumb' => $this->uploadDir . '/thumb',
                        'local-temp' => $this->uploadDir . '/temp',
                        'local-deleted' => $this->uploadDir . '/delete',
                    )
                ) )
            ),
            'wgEnableUploads' => self::getOptionValue( 'wgEnableUploads', $opts, true ),
            'wgUploadNavigationUrl' => false,
            'wgStylePath' => '/skins',
            'wgSitename' => 'MediaWiki',
            'wgLanguageCode' => $lang,
            'wgDBprefix' => $this->db->getType() != 'oracle' ? 'parsertest_' : 'pt_',
            'wgRawHtml' => self::getOptionValue( 'wgRawHtml', $opts, false ),
            'wgLang' => null,
            'wgContLang' => null,
            'wgNamespacesWithSubpages' => array( 0 => isset( $opts['subpage'] ) ),
            'wgMaxTocLevel' => $maxtoclevel,
            'wgCapitalLinks' => true,
            'wgNoFollowLinks' => true,
            'wgNoFollowDomainExceptions' => array(),
            'wgThumbnailScriptPath' => false,
            'wgUseImageResize' => true,
            'wgSVGConverter' => 'null',
            'wgSVGConverters' => array( 'null' => 'echo "1">$output' ),
            'wgLocaltimezone' => 'UTC',
            'wgAllowExternalImages' => self::getOptionValue( 'wgAllowExternalImages', $opts, true ),
            'wgThumbLimits' => array( self::getOptionValue( 'thumbsize', $opts, 180 ) ),
            'wgDefaultLanguageVariant' => $variant,
            'wgVariantArticlePath' => false,
            'wgGroupPermissions' => array( '*' => array(
                'createaccount' => true,
                'read' => true,
                'edit' => true,
                'createpage' => true,
                'createtalk' => true,
            ) ),
            'wgNamespaceProtection' => array( NS_MEDIAWIKI => 'editinterface' ),
            'wgDefaultExternalStore' => array(),
            'wgForeignFileRepos' => array(),
            'wgLinkHolderBatchSize' => $linkHolderBatchSize,
            'wgExperimentalHtmlIds' => false,
            'wgExternalLinkTarget' => false,
            'wgHtml5' => true,
            'wgWellFormedXml' => true,
            'wgAllowMicrodataAttributes' => true,
            'wgAdaptiveMessageCache' => true,
            'wgDisableLangConversion' => false,
            'wgDisableTitleConversion' => false,
            // Tidy options.
            // We always set 'wgUseTidy' to false when parsing, but certain
            // test-running modes still use tidy if available, so ensure
            // that the tidy-related options are all set to their defaults.
            'wgUseTidy' => false,
            'wgAlwaysUseTidy' => false,
            'wgDebugTidy' => false,
            'wgTidyConf' => $IP . '/includes/tidy.conf',
            'wgTidyOpts' => '',
            'wgTidyInternal' => $this->tidySupport->isInternal(),
        );

        if ( $config ) {
            $configLines = explode( "\n", $config );

            foreach ( $configLines as $line ) {
                list( $var, $value ) = explode( '=', $line, 2 );

                $settings[$var] = eval( "return $value;" );
            }
        }

        $this->savedGlobals = array();

        wfRunHooks( 'ParserTestGlobals', array( &$settings ) );

        foreach ( $settings as $var => $val ) {
            if ( array_key_exists( $var, $GLOBALS ) ) {
                $this->savedGlobals[$var] = $GLOBALS[$var];
            }

            $GLOBALS[$var] = $val;
        }

        $GLOBALS['wgContLang'] = Language::factory( $lang );
        $GLOBALS['wgMemc'] = new EmptyBagOStuff;

        $context = new RequestContext();
        $GLOBALS['wgLang'] = $context->getLanguage();
        $GLOBALS['wgOut'] = $context->getOutput();
        $GLOBALS['wgUser'] = $context->getUser();

        // We (re)set $wgThumbLimits to a single-element array above.
        $context->getUser()->setOption( 'thumbsize', 0 );

        global $wgHooks;

        $wgHooks['ParserTestParser'][] = 'ParserTestParserHook::setup';
        $wgHooks['ParserGetVariableValueTs'][] = 'ParserTest::getFakeTimestamp';

        MagicWord::clearCache();

        return $context;
    }

    private function listTables() {
        $tables = array( 'user', 'user_properties', 'user_former_groups', 'page', 'page_restrictions',
            'protected_titles', 'revision', 'text', 'pagelinks', 'imagelinks',
            'categorylinks', 'templatelinks', 'externallinks', 'langlinks', 'iwlinks',
            'site_stats', 'hitcounter', 'ipblocks', 'image', 'oldimage',
            'recentchanges', 'watchlist', 'interwiki', 'logging',
            'querycache', 'objectcache', 'job', 'l10n_cache', 'redirect', 'querycachetwo',
            'archive', 'user_groups', 'page_props', 'category', 'msg_resource', 'msg_resource_links'
        );

        if ( in_array( $this->db->getType(), array( 'mysql', 'sqlite', 'oracle' ) ) ) {
            array_push( $tables, 'searchindex' );
        }

        // Allow extensions to add to the list of tables to duplicate;
        // may be necessary if they hook into page save or other code
        // which will require them while running tests.
        wfRunHooks( 'ParserTestTables', array( &$tables ) );

        return $tables;
    }

    public function setupDatabase() {
        global $wgDBprefix;

        if ( $this->databaseSetupDone ) {
            return;
        }

        $this->db = wfGetDB( DB_MASTER );
        $dbType = $this->db->getType();

        if ( $wgDBprefix === 'parsertest_' || ( $dbType == 'oracle' && $wgDBprefix === 'pt_' ) ) {
            throw new MWException( 'setupDatabase should be called before setupGlobals' );
        }

        $this->databaseSetupDone = true;

        # SqlBagOStuff broke when using temporary tables on r40209 (bug 15892).
        # It seems to have been fixed since (r55079?), but regressed at some point before r85701.
        # This works around it for now...
        ObjectCache::$instances[CACHE_DB] = new HashBagOStuff;

        # CREATE TEMPORARY TABLE breaks if there is more than one server
        if ( wfGetLB()->getServerCount() != 1 ) {
            $this->useTemporaryTables = false;
        }

        $temporary = $this->useTemporaryTables || $dbType == 'postgres';
        $prefix = $dbType != 'oracle' ? 'parsertest_' : 'pt_';

        $this->dbClone = new CloneDatabase( $this->db, $this->listTables(), $prefix );
        $this->dbClone->useTemporaryTables( $temporary );
        $this->dbClone->cloneTableStructure();

        if ( $dbType == 'oracle' ) {
            $this->db->query( 'BEGIN FILL_WIKI_INFO; END;' );
            # Insert 0 user to prevent FK violations

            # Anonymous user
            $this->db->insert( 'user', array(
                'user_id' => 0,
                'user_name' => 'Anonymous' ) );
        }

        # Update certain things in site_stats
        $this->db->insert( 'site_stats',
            array( 'ss_row_id' => 1, 'ss_images' => 2, 'ss_good_articles' => 1 ) );

        # Reinitialise the LocalisationCache to match the database state
        Language::getLocalisationCache()->unloadAll();

        # Clear the message cache
        MessageCache::singleton()->clear();

        // Remember to update newParserTests.php after changing the below
        // (and it uses a slightly different syntax just for teh lulz)
        $this->uploadDir = $this->setupUploadDir();
        $user = User::createNew( 'WikiSysop' );
        $image = wfLocalFile( Title::makeTitle( NS_FILE, 'Foobar.jpg' ) );
        # note that the size/width/height/bits/etc of the file
        # are actually set by inspecting the file itself; the arguments
        # to recordUpload2 have no effect.  That said, we try to make things
        # match up so it is less confusing to readers of the code & tests.
        $image->recordUpload2( '', 'Upload of some lame file', 'Some lame file', array(
            'size' => 7881,
            'width' => 1941,
            'height' => 220,
            'bits' => 8,
            'media_type' => MEDIATYPE_BITMAP,
            'mime' => 'image/jpeg',
            'metadata' => serialize( array() ),
            'sha1' => wfBaseConvert( '1', 16, 36, 31 ),
            'fileExists' => true
        ), $this->db->timestamp( '20010115123500' ), $user );

        $image = wfLocalFile( Title::makeTitle( NS_FILE, 'Thumb.png' ) );
        # again, note that size/width/height below are ignored; see above.
        $image->recordUpload2( '', 'Upload of some lame thumbnail', 'Some lame thumbnail', array(
            'size' => 22589,
            'width' => 135,
            'height' => 135,
            'bits' => 8,
            'media_type' => MEDIATYPE_BITMAP,
            'mime' => 'image/png',
            'metadata' => serialize( array() ),
            'sha1' => wfBaseConvert( '2', 16, 36, 31 ),
            'fileExists' => true
        ), $this->db->timestamp( '20130225203040' ), $user );

        $image = wfLocalFile( Title::makeTitle( NS_FILE, 'Foobar.svg' ) );
        $image->recordUpload2( '', 'Upload of some lame SVG', 'Some lame SVG', array(
                'size'        => 12345,
                'width'       => 240,
                'height'      => 180,
                'bits'        => 0,
                'media_type'  => MEDIATYPE_DRAWING,
                'mime'        => 'image/svg+xml',
                'metadata'    => serialize( array() ),
                'sha1'        => wfBaseConvert( '', 16, 36, 31 ),
                'fileExists'  => true
        ), $this->db->timestamp( '20010115123500' ), $user );

        # This image will be blacklisted in [[MediaWiki:Bad image list]]
        $image = wfLocalFile( Title::makeTitle( NS_FILE, 'Bad.jpg' ) );
        $image->recordUpload2( '', 'zomgnotcensored', 'Borderline image', array(
            'size' => 12345,
            'width' => 320,
            'height' => 240,
            'bits' => 24,
            'media_type' => MEDIATYPE_BITMAP,
            'mime' => 'image/jpeg',
            'metadata' => serialize( array() ),
            'sha1' => wfBaseConvert( '3', 16, 36, 31 ),
            'fileExists' => true
        ), $this->db->timestamp( '20010115123500' ), $user );

        # A DjVu file
        $image = wfLocalFile( Title::makeTitle( NS_FILE, 'LoremIpsum.djvu' ) );
        $image->recordUpload2( '', 'Upload a DjVu', 'A DjVu', array(
            'size' => 3249,
            'width' => 2480,
            'height' => 3508,
            'bits' => 0,
            'media_type' => MEDIATYPE_BITMAP,
            'mime' => 'image/vnd.djvu',
            'metadata' => '<?xml version="1.0" ?>
<!DOCTYPE DjVuXML PUBLIC "-//W3C//DTD DjVuXML 1.1//EN" "pubtext/DjVuXML-s.dtd">
<DjVuXML>
<HEAD></HEAD>
<BODY><OBJECT height="3508" width="2480">
<PARAM name="DPI" value="300" />
<PARAM name="GAMMA" value="2.2" />
</OBJECT>
<OBJECT height="3508" width="2480">
<PARAM name="DPI" value="300" />
<PARAM name="GAMMA" value="2.2" />
</OBJECT>
<OBJECT height="3508" width="2480">
<PARAM name="DPI" value="300" />
<PARAM name="GAMMA" value="2.2" />
</OBJECT>
<OBJECT height="3508" width="2480">
<PARAM name="DPI" value="300" />
<PARAM name="GAMMA" value="2.2" />
</OBJECT>
<OBJECT height="3508" width="2480">
<PARAM name="DPI" value="300" />
<PARAM name="GAMMA" value="2.2" />
</OBJECT>
</BODY>
</DjVuXML>',
            'sha1' => wfBaseConvert( '', 16, 36, 31 ),
            'fileExists' => true
        ), $this->db->timestamp( '20010115123600' ), $user );
    }

    public function teardownDatabase() {
        if ( !$this->databaseSetupDone ) {
            $this->teardownGlobals();
            return;
        }
        $this->teardownUploadDir( $this->uploadDir );

        $this->dbClone->destroy();
        $this->databaseSetupDone = false;

        if ( $this->useTemporaryTables ) {
            if ( $this->db->getType() == 'sqlite' ) {
                # Under SQLite the searchindex table is virtual and need
                # to be explicitly destroyed. See bug 29912
                # See also MediaWikiTestCase::destroyDB()
                wfDebug( __METHOD__ . " explicitly destroying sqlite virtual table parsertest_searchindex\n" );
                $this->db->query( "DROP TABLE `parsertest_searchindex`" );
            }
            # Don't need to do anything
            $this->teardownGlobals();
            return;
        }

        $tables = $this->listTables();

        foreach ( $tables as $table ) {
            if ( $this->db->getType() == 'oracle' ) {
                $this->db->query( "DROP TABLE pt_$table DROP CONSTRAINTS" );
            } else {
                $this->db->query( "DROP TABLE `parsertest_$table`" );
            }
        }

        if ( $this->db->getType() == 'oracle' ) {
            $this->db->query( 'BEGIN FILL_WIKI_INFO; END;' );
        }

        $this->teardownGlobals();
    }

    private function setupUploadDir() {
        global $IP;

        if ( $this->keepUploads ) {
            $dir = wfTempDir() . '/mwParser-images';

            if ( is_dir( $dir ) ) {
                return $dir;
            }
        } else {
            $dir = wfTempDir() . "/mwParser-" . mt_rand() . "-images";
        }

        // wfDebug( "Creating upload directory $dir\n" );
        if ( file_exists( $dir ) ) {
            wfDebug( "Already exists!\n" );
            return $dir;
        }

        wfMkdirParents( $dir . '/3/3a', null, __METHOD__ );
        copy( "$IP/tests/phpunit/data/parser/headbg.jpg", "$dir/3/3a/Foobar.jpg" );
        wfMkdirParents( $dir . '/e/ea', null, __METHOD__ );
        copy( "$IP/tests/phpunit/data/parser/wiki.png", "$dir/e/ea/Thumb.png" );
        wfMkdirParents( $dir . '/0/09', null, __METHOD__ );
        copy( "$IP/tests/phpunit/data/parser/headbg.jpg", "$dir/0/09/Bad.jpg" );
        wfMkdirParents( $dir . '/f/ff', null, __METHOD__ );
        file_put_contents( "$dir/f/ff/Foobar.svg",
            '<?xml version="1.0" encoding="utf-8"?>' .
            '<svg xmlns="http://www.w3.org/2000/svg"' .
            ' version="1.1" width="240" height="180"/>' );
        wfMkdirParents( $dir . '/5/5f', null, __METHOD__ );
        copy( "$IP/tests/phpunit/data/parser/LoremIpsum.djvu", "$dir/5/5f/LoremIpsum.djvu" );

        return $dir;
    }

    private function teardownGlobals() {
        RepoGroup::destroySingleton();
        FileBackendGroup::destroySingleton();
        LockManagerGroup::destroySingletons();
        LinkCache::singleton()->clear();

        foreach ( $this->savedGlobals as $var => $val ) {
            $GLOBALS[$var] = $val;
        }
    }

    private function teardownUploadDir( $dir ) {
        if ( $this->keepUploads ) {
            return;
        }

        // delete the files first, then the dirs.
        self::deleteFiles(
            array(
                "$dir/3/3a/Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/1000px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/100px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/120px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/1280px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/137px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/1500px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/177px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/180px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/200px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/206px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/20px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/220px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/265px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/270px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/274px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/300px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/30px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/330px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/353px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/360px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/400px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/40px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/440px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/442px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/450px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/50px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/600px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/640px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/70px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/75px-Foobar.jpg",
                "$dir/thumb/3/3a/Foobar.jpg/960px-Foobar.jpg",

                "$dir/e/ea/Thumb.png",

                "$dir/0/09/Bad.jpg",

                "$dir/5/5f/LoremIpsum.djvu",
                "$dir/thumb/5/5f/LoremIpsum.djvu/page2-2480px-LoremIpsum.djvu.jpg",
                "$dir/thumb/5/5f/LoremIpsum.djvu/page2-3720px-LoremIpsum.djvu.jpg",
                "$dir/thumb/5/5f/LoremIpsum.djvu/page2-4960px-LoremIpsum.djvu.jpg",

                "$dir/f/ff/Foobar.svg",
                "$dir/thumb/f/ff/Foobar.svg/180px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/2000px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/270px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/3000px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/360px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/4000px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/langde-180px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/langde-270px-Foobar.svg.png",
                "$dir/thumb/f/ff/Foobar.svg/langde-360px-Foobar.svg.png",

                "$dir/math/f/a/5/fa50b8b616463173474302ca3e63586b.png",
            )
        );

        self::deleteDirs(
            array(
                "$dir/3/3a",
                "$dir/3",
                "$dir/thumb/3/3a/Foobar.jpg",
                "$dir/thumb/3/3a",
                "$dir/thumb/3",
                "$dir/e/ea",
                "$dir/e",
                "$dir/f/ff/",
                "$dir/f/",
                "$dir/thumb/f/ff/Foobar.svg",
                "$dir/thumb/f/ff/",
                "$dir/thumb/f/",
                "$dir/0/09/",
                "$dir/0/",
                "$dir/5/5f",
                "$dir/5",
                "$dir/thumb/5/5f/LoremIpsum.djvu",
                "$dir/thumb/5/5f",
                "$dir/thumb/5",
                "$dir/thumb",
                "$dir/math/f/a/5",
                "$dir/math/f/a",
                "$dir/math/f",
                "$dir/math",
                "$dir",
            )
        );
    }

    private static function deleteFiles( $files ) {
        foreach ( $files as $file ) {
            if ( file_exists( $file ) ) {
                unlink( $file );
            }
        }
    }

    private static function deleteDirs( $dirs ) {
        foreach ( $dirs as $dir ) {
            if ( is_dir( $dir ) ) {
                rmdir( $dir );
            }
        }
    }

    protected function showTesting( $desc ) {
        print "Running test $desc... ";
    }

    protected function showSuccess( ParserTestResult $testResult ) {
        if ( $this->showProgress ) {
            print $this->term->color( '1;32' ) . 'PASSED' . $this->term->reset() . "\n";
        }

        return true;
    }

    protected function showFailure( ParserTestResult $testResult ) {
        if ( $this->showFailure ) {
            if ( !$this->showProgress ) {
                # In quiet mode we didn't show the 'Testing' message before the
                # test, in case it succeeded. Show it now:
                $this->showTesting( $testResult->description );
            }

            print $this->term->color( '31' ) . 'FAILED!' . $this->term->reset() . "\n";

            if ( $this->showOutput ) {
                print "--- Expected ---\n{$testResult->expected}\n";
                print "--- Actual ---\n{$testResult->actual}\n";
            }

            if ( $this->showDiffs ) {
                print $this->quickDiff( $testResult->expected, $testResult->actual );
                if ( !$this->wellFormed( $testResult->actual ) ) {
                    print "XML error: $this->mXmlError\n";
                }
            }
        }

        return false;
    }

    protected function showSkipped() {
        if ( $this->showProgress ) {
            print $this->term->color( '1;33' ) . 'SKIPPED' . $this->term->reset() . "\n";
        }

        return true;
    }

    protected function quickDiff( $input, $output,
        $inFileTail = 'expected', $outFileTail = 'actual'
    ) {
        # Windows, or at least the fc utility, is retarded
        $slash = wfIsWindows() ? '\\' : '/';
        $prefix = wfTempDir() . "{$slash}mwParser-" . mt_rand();

        $infile = "$prefix-$inFileTail";
        $this->dumpToFile( $input, $infile );

        $outfile = "$prefix-$outFileTail";
        $this->dumpToFile( $output, $outfile );

        $shellInfile = wfEscapeShellArg( $infile );
        $shellOutfile = wfEscapeShellArg( $outfile );

        global $wgDiff3;
        // we assume that people with diff3 also have usual diff
        $shellCommand = ( wfIsWindows() && !$wgDiff3 ) ? 'fc' : 'diff -au';

        $diff = wfShellExec( "$shellCommand $shellInfile $shellOutfile" );

        unlink( $infile );
        unlink( $outfile );

        return $this->colorDiff( $diff );
    }

    private function dumpToFile( $data, $filename ) {
        $file = fopen( $filename, "wt" );
        fwrite( $file, $data . "\n" );
        fclose( $file );
    }

    protected function colorDiff( $text ) {
        return preg_replace(
            array( '/^(-.*)$/m', '/^(\+.*)$/m' ),
            array( $this->term->color( 34 ) . '$1' . $this->term->reset(),
                $this->term->color( 31 ) . '$1' . $this->term->reset() ),
            $text );
    }

    public function showRunFile( $path ) {
        print $this->term->color( 1 ) .
            "Reading tests from \"$path\"..." .
            $this->term->reset() .
            "\n";
    }

    public static function addArticle( $name, $text, $line = 'unknown', $ignoreDuplicate = '' ) {
        global $wgCapitalLinks;

        $oldCapitalLinks = $wgCapitalLinks;
        $wgCapitalLinks = true; // We only need this from SetupGlobals() See r70917#c8637

        $text = self::chomp( $text );
        $name = self::chomp( $name );

        $title = Title::newFromText( $name );

        if ( is_null( $title ) ) {
            throw new MWException( "invalid title '$name' at line $line\n" );
        }

        $page = WikiPage::factory( $title );
        $page->loadPageData( 'fromdbmaster' );

        if ( $page->exists() ) {
            if ( $ignoreDuplicate == 'ignoreduplicate' ) {
                return;
            } else {
                throw new MWException( "duplicate article '$name' at line $line\n" );
            }
        }

        $page->doEditContent( ContentHandler::makeContent( $text, $title ), '', EDIT_NEW );

        $wgCapitalLinks = $oldCapitalLinks;
    }

    public function requireHook( $name ) {
        global $wgParser;

        $wgParser->firstCallInit(); // make sure hooks are loaded.

        if ( isset( $wgParser->mTagHooks[$name] ) ) {
            $this->hooks[$name] = $wgParser->mTagHooks[$name];
        } else {
            echo "   This test suite requires the '$name' hook extension, skipping.\n";
            return false;
        }

        return true;
    }

    public function requireFunctionHook( $name ) {
        global $wgParser;

        $wgParser->firstCallInit(); // make sure hooks are loaded.

        if ( isset( $wgParser->mFunctionHooks[$name] ) ) {
            $this->functionHooks[$name] = $wgParser->mFunctionHooks[$name];
        } else {
            echo "   This test suite requires the '$name' function hook extension, skipping.\n";
            return false;
        }

        return true;
    }

    public function requireTransparentHook( $name ) {
        global $wgParser;

        $wgParser->firstCallInit(); // make sure hooks are loaded.

        if ( isset( $wgParser->mTransparentTagHooks[$name] ) ) {
            $this->transparentHooks[$name] = $wgParser->mTransparentTagHooks[$name];
        } else {
            echo "   This test suite requires the '$name' transparent hook extension, skipping.\n";
            return false;
        }

        return true;
    }

    private function wellFormed( $text ) {
        $html =
            Sanitizer::hackDocType() .
                '<html>' .
                $text .
                '</html>';

        $parser = xml_parser_create( "UTF-8" );

        # case folding violates XML standard, turn it off
        xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );

        if ( !xml_parse( $parser, $html, true ) ) {
            $err = xml_error_string( xml_get_error_code( $parser ) );
            $position = xml_get_current_byte_index( $parser );
            $fragment = $this->extractFragment( $html, $position );
            $this->mXmlError = "$err at byte $position:\n$fragment";
            xml_parser_free( $parser );

            return false;
        }

        xml_parser_free( $parser );

        return true;
    }

    private function extractFragment( $text, $position ) {
        $start = max( 0, $position - 10 );
        $before = $position - $start;
        $fragment = '...' .
            $this->term->color( 34 ) .
            substr( $text, $start, $before ) .
            $this->term->color( 0 ) .
            $this->term->color( 31 ) .
            $this->term->color( 1 ) .
            substr( $text, $position, 1 ) .
            $this->term->color( 0 ) .
            $this->term->color( 34 ) .
            substr( $text, $position + 1, 9 ) .
            $this->term->color( 0 ) .
            '...';
        $display = str_replace( "\n", ' ', $fragment );
        $caret = '   ' .
            str_repeat( ' ', $before ) .
            $this->term->color( 31 ) .
            '^' .
            $this->term->color( 0 );

        return "$display\n$caret";
    }

    static function getFakeTimestamp( &$parser, &$ts ) {
        $ts = 123; //parsed as '1970-01-01T00:02:03Z'
        return true;
    }
}