path: root/WebKitTools/DumpRenderTree/mac/LayoutTestControllerMac.mm

/*
 * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer. 
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "config.h"
#import "DumpRenderTree.h"
#import "LayoutTestController.h"

#import "EditingDelegate.h"
#import "PolicyDelegate.h"
#import "WorkQueue.h"
#import "WorkQueueItem.h"
#import <Foundation/Foundation.h>
#import <JavaScriptCore/JSRetainPtr.h>
#import <JavaScriptCore/JSStringRef.h>
#import <JavaScriptCore/JSStringRefCF.h>
#import <WebKit/DOMDocument.h>
#import <WebKit/DOMElement.h>
#import <WebKit/WebApplicationCache.h>
#import <WebKit/WebBackForwardList.h>
#import <WebKit/WebCoreStatistics.h>
#import <WebKit/WebDataSource.h>
#import <WebKit/WebDatabaseManagerPrivate.h>
#import <WebKit/WebFrame.h>
#import <WebKit/WebFrameViewPrivate.h>
#import <WebKit/WebGeolocationMockPrivate.h>
#import <WebKit/WebHTMLRepresentation.h>
#import <WebKit/WebHTMLViewPrivate.h>
#import <WebKit/WebHistory.h>
#import <WebKit/WebHistoryPrivate.h>
#import <WebKit/WebIconDatabasePrivate.h>
#import <WebKit/WebInspectorPrivate.h>
#import <WebKit/WebNSURLExtras.h>
#import <WebKit/WebPreferences.h>
#import <WebKit/WebPreferencesPrivate.h>
#import <WebKit/WebScriptWorld.h>
#import <WebKit/WebSecurityOriginPrivate.h>
#import <WebKit/WebTypesInternal.h>
#import <WebKit/WebView.h>
#import <WebKit/WebViewPrivate.h>
#import <WebKit/WebWorkersPrivate.h>
#import <wtf/HashMap.h>
#import <wtf/RetainPtr.h>

@interface CommandValidationTarget : NSObject <NSValidatedUserInterfaceItem>
{
    SEL _action;
}
- (id)initWithAction:(SEL)action;
@end

@implementation CommandValidationTarget

- (id)initWithAction:(SEL)action
{
    self = [super init];
    if (!self)
        return nil;

    _action = action;
    return self;
}

- (SEL)action
{
    return _action;
}

- (NSInteger)tag
{
    return 0;
}

@end

LayoutTestController::~LayoutTestController()
{
}

void LayoutTestController::addDisallowedURL(JSStringRef url)
{
    RetainPtr<CFStringRef> urlCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, url));

    if (!disallowedURLs)
        disallowedURLs = CFSetCreateMutable(kCFAllocatorDefault, 0, NULL);

    // Canonicalize the URL
    NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:(NSString *)urlCF.get()]];
    request = [NSURLProtocol canonicalRequestForRequest:request];

    CFSetAddValue(disallowedURLs, [request URL]);
}

void LayoutTestController::clearAllDatabases()
{
    [[WebDatabaseManager sharedWebDatabaseManager] deleteAllDatabases];
}

void LayoutTestController::clearBackForwardList()
{
    WebBackForwardList *backForwardList = [[mainFrame webView] backForwardList];
    WebHistoryItem *item = [[backForwardList currentItem] retain];

    // We clear the history by setting the back/forward list's capacity to 0
    // then restoring it back and adding back the current item.
    int capacity = [backForwardList capacity];
    [backForwardList setCapacity:0];
    [backForwardList setCapacity:capacity];
    [backForwardList addItem:item];
    [backForwardList goToItem:item];
    [item release];
}

JSStringRef LayoutTestController::copyDecodedHostName(JSStringRef name)
{
    RetainPtr<CFStringRef> nameCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, name));
    NSString *nameNS = (NSString *)nameCF.get();
    return JSStringCreateWithCFString((CFStringRef)[nameNS _web_decodeHostName]);
}

JSStringRef LayoutTestController::copyEncodedHostName(JSStringRef name)
{
    RetainPtr<CFStringRef> nameCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, name));
    NSString *nameNS = (NSString *)nameCF.get();
    return JSStringCreateWithCFString((CFStringRef)[nameNS _web_encodeHostName]);
}

void LayoutTestController::display()
{
    displayWebView();
}

JSRetainPtr<JSStringRef> LayoutTestController::counterValueForElementById(JSStringRef id)
{
    RetainPtr<CFStringRef> idCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, id));
    NSString *idNS = (NSString *)idCF.get();

    DOMElement *element = [[mainFrame DOMDocument] getElementById:idNS];
    if (!element)
        return 0;

    JSRetainPtr<JSStringRef> counterValue(Adopt, JSStringCreateWithCFString((CFStringRef)[mainFrame counterValueForElement:element]));
    return counterValue;
}

void LayoutTestController::keepWebHistory()
{
    if (![WebHistory optionalSharedHistory]) {
        WebHistory *history = [[WebHistory alloc] init];
        [WebHistory setOptionalSharedHistory:history];
        [history release];
    }
}

size_t LayoutTestController::webHistoryItemCount()
{
    return [[[WebHistory optionalSharedHistory] allItems] count];
}

unsigned LayoutTestController::workerThreadCount() const
{
    return [WebWorkersPrivate workerThreadCount];
}

void LayoutTestController::notifyDone()
{
    if (m_waitToDump && !topLoadingFrame && !WorkQueue::shared()->count())
        dump();
    m_waitToDump = false;
}

JSStringRef LayoutTestController::pathToLocalResource(JSContextRef context, JSStringRef url)
{
    return JSStringRetain(url); // Do nothing on mac.
}

void LayoutTestController::queueLoad(JSStringRef url, JSStringRef target)
{
    RetainPtr<CFStringRef> urlCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, url));
    NSString *urlNS = (NSString *)urlCF.get();

    NSURL *nsurl = [NSURL URLWithString:urlNS relativeToURL:[[[mainFrame dataSource] response] URL]];
    NSString* nsurlString = [nsurl absoluteString];

    JSRetainPtr<JSStringRef> absoluteURL(Adopt, JSStringCreateWithUTF8CString([nsurlString UTF8String]));
    WorkQueue::shared()->queue(new LoadItem(absoluteURL.get(), target));
}

void LayoutTestController::setAcceptsEditing(bool newAcceptsEditing)
{
    [(EditingDelegate *)[[mainFrame webView] editingDelegate] setAcceptsEditing:newAcceptsEditing];
}

void LayoutTestController::setAlwaysAcceptCookies(bool alwaysAcceptCookies)
{
    if (alwaysAcceptCookies == m_alwaysAcceptCookies)
        return;

    m_alwaysAcceptCookies = alwaysAcceptCookies;
    NSHTTPCookieAcceptPolicy cookieAcceptPolicy = alwaysAcceptCookies ? NSHTTPCookieAcceptPolicyAlways : NSHTTPCookieAcceptPolicyOnlyFromMainDocumentDomain;
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookieAcceptPolicy:cookieAcceptPolicy];
}

void LayoutTestController::setAppCacheMaximumSize(unsigned long long size)
{
    [WebApplicationCache setMaximumSize:size];
}

void LayoutTestController::setAuthorAndUserStylesEnabled(bool flag)
{
    [[[mainFrame webView] preferences] setAuthorAndUserStylesEnabled:flag];
}

void LayoutTestController::setCustomPolicyDelegate(bool setDelegate, bool permissive)
{
    if (setDelegate) {
        [policyDelegate setPermissive:permissive];
        [[mainFrame webView] setPolicyDelegate:policyDelegate];
    } else
        [[mainFrame webView] setPolicyDelegate:nil];
}

void LayoutTestController::setDatabaseQuota(unsigned long long quota)
{    
    WebSecurityOrigin *origin = [[WebSecurityOrigin alloc] initWithURL:[NSURL URLWithString:@"file:///"]];
    [origin setQuota:quota];
    [origin release];
}

void LayoutTestController::setMockGeolocationPosition(double latitude, double longitude, double accuracy)
{
    [WebGeolocationMock setPosition:latitude:longitude:accuracy];
}

void LayoutTestController::setMockGeolocationError(int code, JSStringRef message)
{
    RetainPtr<CFStringRef> messageCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, message));
    NSString *messageNS = (NSString *)messageCF.get();
    [WebGeolocationMock setError:code:messageNS];
}

void LayoutTestController::setIconDatabaseEnabled(bool iconDatabaseEnabled)
{
    // FIXME: Workaround <rdar://problem/6480108>
    static WebIconDatabase* sharedWebIconDatabase = NULL;
    if (!sharedWebIconDatabase) {
        if (!iconDatabaseEnabled)
            return;
        sharedWebIconDatabase = [WebIconDatabase sharedIconDatabase];
        if ([sharedWebIconDatabase isEnabled] == iconDatabaseEnabled)
            return;
    }
    [sharedWebIconDatabase setEnabled:iconDatabaseEnabled];
}

void LayoutTestController::setJavaScriptProfilingEnabled(bool profilingEnabled)
{
    [[[mainFrame webView] preferences] setDeveloperExtrasEnabled:profilingEnabled];
    [[[mainFrame webView] inspector] setJavaScriptProfilingEnabled:profilingEnabled];
}

void LayoutTestController::setMainFrameIsFirstResponder(bool flag)
{
    NSView *documentView = [[mainFrame frameView] documentView];
    
    NSResponder *firstResponder = flag ? documentView : nil;
    [[[mainFrame webView] window] makeFirstResponder:firstResponder];
}

void LayoutTestController::setPrivateBrowsingEnabled(bool privateBrowsingEnabled)
{
    [[[mainFrame webView] preferences] setPrivateBrowsingEnabled:privateBrowsingEnabled];
}

void LayoutTestController::setXSSAuditorEnabled(bool enabled)
{
    [[[mainFrame webView] preferences] setXSSAuditorEnabled:enabled];
}

void LayoutTestController::setAllowUniversalAccessFromFileURLs(bool enabled)
{
    [[[mainFrame webView] preferences] setAllowUniversalAccessFromFileURLs:enabled];
}

void LayoutTestController::setPopupBlockingEnabled(bool popupBlockingEnabled)
{
    [[[mainFrame webView] preferences] setJavaScriptCanOpenWindowsAutomatically:!popupBlockingEnabled];
}

void LayoutTestController::setTabKeyCyclesThroughElements(bool cycles)
{
    [[mainFrame webView] setTabKeyCyclesThroughElements:cycles];
}

void LayoutTestController::setTimelineProfilingEnabled(bool enabled)
{
    [[[mainFrame webView] inspector] setTimelineProfilingEnabled:enabled];
}

void LayoutTestController::setUseDashboardCompatibilityMode(bool flag)
{
    [[mainFrame webView] _setDashboardBehavior:WebDashboardBehaviorUseBackwardCompatibilityMode to:flag];
}

void LayoutTestController::setUserStyleSheetEnabled(bool flag)
{
    [[WebPreferences standardPreferences] setUserStyleSheetEnabled:flag];
}

void LayoutTestController::setUserStyleSheetLocation(JSStringRef path)
{
    RetainPtr<CFStringRef> pathCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, path));
    NSURL *url = [NSURL URLWithString:(NSString *)pathCF.get()];
    [[WebPreferences standardPreferences] setUserStyleSheetLocation:url];
}

void LayoutTestController::disableImageLoading()
{
    [[WebPreferences standardPreferences] setLoadsImagesAutomatically:NO];
}

void LayoutTestController::dispatchPendingLoadRequests()
{
    [[mainFrame webView] _dispatchPendingLoadRequests];
}

void LayoutTestController::overridePreference(JSStringRef key, JSStringRef value)
{
    RetainPtr<CFStringRef> keyCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, key));
    NSString *keyNS = (NSString *)keyCF.get();

    RetainPtr<CFStringRef> valueCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, value));
    NSString *valueNS = (NSString *)valueCF.get();

    [[WebPreferences standardPreferences] _setPreferenceForTestWithValue:valueNS forKey:keyNS];
}

void LayoutTestController::removeAllVisitedLinks()
{
    [WebHistory _removeAllVisitedLinks];
}

void LayoutTestController::setPersistentUserStyleSheetLocation(JSStringRef jsURL)
{
    RetainPtr<CFStringRef> urlString(AdoptCF, JSStringCopyCFString(0, jsURL));
    ::setPersistentUserStyleSheetLocation(urlString.get());
}

void LayoutTestController::clearPersistentUserStyleSheet()
{
    ::setPersistentUserStyleSheetLocation(0);
}

void LayoutTestController::setWindowIsKey(bool windowIsKey)
{
    m_windowIsKey = windowIsKey;
    [[mainFrame webView] _updateActiveState];
}

void LayoutTestController::setSmartInsertDeleteEnabled(bool flag)
{
    [[mainFrame webView] setSmartInsertDeleteEnabled:flag];
}

void LayoutTestController::setSelectTrailingWhitespaceEnabled(bool flag)
{
    [[mainFrame webView] setSelectTrailingWhitespaceEnabled:flag];
}

static const CFTimeInterval waitToDumpWatchdogInterval = 15.0;

static void waitUntilDoneWatchdogFired(CFRunLoopTimerRef timer, void* info)
{
    gLayoutTestController->waitToDumpWatchdogTimerFired();
}

void LayoutTestController::setWaitToDump(bool waitUntilDone)
{
    m_waitToDump = waitUntilDone;
    if (m_waitToDump && !waitToDumpWatchdog) {
        waitToDumpWatchdog = CFRunLoopTimerCreate(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent() + waitToDumpWatchdogInterval, 0, 0, 0, waitUntilDoneWatchdogFired, NULL);
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), waitToDumpWatchdog, kCFRunLoopCommonModes);
    }
}

int LayoutTestController::windowCount()
{
    return CFArrayGetCount(openWindowsRef);
}

bool LayoutTestController::elementDoesAutoCompleteForElementWithId(JSStringRef id)
{
    RetainPtr<CFStringRef> idCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, id));
    NSString *idNS = (NSString *)idCF.get();
    
    DOMElement *element = [[mainFrame DOMDocument] getElementById:idNS];
    id rep = [[mainFrame dataSource] representation];
    
    if ([rep class] == [WebHTMLRepresentation class])
        return [(WebHTMLRepresentation *)rep elementDoesAutoComplete:element];

    return false;
}

void LayoutTestController::execCommand(JSStringRef name, JSStringRef value)
{
    RetainPtr<CFStringRef> nameCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, name));
    NSString *nameNS = (NSString *)nameCF.get();

    RetainPtr<CFStringRef> valueCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, value));
    NSString *valueNS = (NSString *)valueCF.get();

    [[mainFrame webView] _executeCoreCommandByName:nameNS value:valueNS];
}

void LayoutTestController::setCacheModel(int cacheModel)
{
    [[WebPreferences standardPreferences] setCacheModel:cacheModel];
}

bool LayoutTestController::isCommandEnabled(JSStringRef name)
{
    RetainPtr<CFStringRef> nameCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, name));
    NSString *nameNS = reinterpret_cast<const NSString *>(nameCF.get());

    // Accept command strings with capital letters for first letter without trailing colon.
    if (![nameNS hasSuffix:@":"] && [nameNS length]) {
        nameNS = [[[[nameNS substringToIndex:1] lowercaseString]
            stringByAppendingString:[nameNS substringFromIndex:1]]
            stringByAppendingString:@":"];
    }

    SEL selector = NSSelectorFromString(nameNS);
    RetainPtr<CommandValidationTarget> target(AdoptNS, [[CommandValidationTarget alloc] initWithAction:selector]);
    id validator = [NSApp targetForAction:selector to:[mainFrame webView] from:target.get()];
    if (!validator)
        return false;
    if (![validator respondsToSelector:selector])
        return false;
    if (![validator respondsToSelector:@selector(validateUserInterfaceItem:)])
        return true;
    return [validator validateUserInterfaceItem:target.get()];
}

bool LayoutTestController::pauseAnimationAtTimeOnElementWithId(JSStringRef animationName, double time, JSStringRef elementId)
{
    RetainPtr<CFStringRef> idCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, elementId));
    NSString *idNS = (NSString *)idCF.get();
    RetainPtr<CFStringRef> nameCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, animationName));
    NSString *nameNS = (NSString *)nameCF.get();
    
    return [mainFrame _pauseAnimation:nameNS onNode:[[mainFrame DOMDocument] getElementById:idNS] atTime:time];
}

bool LayoutTestController::pauseTransitionAtTimeOnElementWithId(JSStringRef propertyName, double time, JSStringRef elementId)
{
    RetainPtr<CFStringRef> idCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, elementId));
    NSString *idNS = (NSString *)idCF.get();
    RetainPtr<CFStringRef> nameCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, propertyName));
    NSString *nameNS = (NSString *)nameCF.get();
    
    return [mainFrame _pauseTransitionOfProperty:nameNS onNode:[[mainFrame DOMDocument] getElementById:idNS] atTime:time];
}

bool LayoutTestController::sampleSVGAnimationForElementAtTime(JSStringRef animationId, double time, JSStringRef elementId)
{
    RetainPtr<CFStringRef> animationIDCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, animationId));
    NSString *animationIDNS = (NSString *)animationIDCF.get();
    RetainPtr<CFStringRef> elementIDCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, elementId));
    NSString *elementIDNS = (NSString *)elementIDCF.get();

    return [mainFrame _pauseSVGAnimation:elementIDNS onSMILNode:[[mainFrame DOMDocument] getElementById:animationIDNS] atTime:time];
}

unsigned LayoutTestController::numberOfActiveAnimations() const
{
    return [mainFrame _numberOfActiveAnimations];
}

void LayoutTestController::waitForPolicyDelegate()
{
    setWaitToDump(true);
    [policyDelegate setControllerToNotifyDone:this];
    [[mainFrame webView] setPolicyDelegate:policyDelegate];
}

void LayoutTestController::whiteListAccessFromOrigin(JSStringRef sourceOrigin, JSStringRef destinationProtocol, JSStringRef destinationHost, bool allowDestinationSubdomains)
{
    RetainPtr<CFStringRef> sourceOriginCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, sourceOrigin));
    NSString *sourceOriginNS = (NSString *)sourceOriginCF.get();
    RetainPtr<CFStringRef> protocolCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, destinationProtocol));
    NSString *destinationProtocolNS = (NSString *)protocolCF.get();
    RetainPtr<CFStringRef> hostCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, destinationHost));
    NSString *destinationHostNS = (NSString *)hostCF.get();
    [WebView _whiteListAccessFromOrigin:sourceOriginNS destinationProtocol:destinationProtocolNS destinationHost:destinationHostNS allowDestinationSubdomains:allowDestinationSubdomains];
}

void LayoutTestController::addUserScript(JSStringRef source, bool runAtStart)
{
    RetainPtr<CFStringRef> sourceCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, source));
    NSString *sourceNS = (NSString *)sourceCF.get();
    [WebView _addUserScriptToGroup:@"org.webkit.DumpRenderTree" world:[WebScriptWorld world] source:sourceNS url:nil whitelist:nil blacklist:nil injectionTime:(runAtStart ? WebInjectAtDocumentStart : WebInjectAtDocumentEnd)];
}

void LayoutTestController::addUserStyleSheet(JSStringRef source)
{
    RetainPtr<CFStringRef> sourceCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, source));
    NSString *sourceNS = (NSString *)sourceCF.get();
    [WebView _addUserStyleSheetToGroup:@"org.webkit.DumpRenderTree" world:[WebScriptWorld world] source:sourceNS url:nil whitelist:nil blacklist:nil];
}

void LayoutTestController::showWebInspector()
{
    [[[mainFrame webView] preferences] setDeveloperExtrasEnabled:true];
    [[[mainFrame webView] inspector] show:nil];
}

void LayoutTestController::closeWebInspector()
{
    [[[mainFrame webView] inspector] close:nil];
    [[[mainFrame webView] preferences] setDeveloperExtrasEnabled:false];
}

void LayoutTestController::evaluateInWebInspector(long callId, JSStringRef script)
{
    RetainPtr<CFStringRef> scriptCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, script));
    NSString *scriptNS = (NSString *)scriptCF.get();
    [[[mainFrame webView] inspector] evaluateInFrontend:nil callId:callId script:scriptNS];
}

typedef HashMap<unsigned, RetainPtr<WebScriptWorld> > WorldMap;
static WorldMap& worldMap()
{
    static WorldMap& map = *new WorldMap;
    return map;
}

unsigned worldIDForWorld(WebScriptWorld *world)
{
    WorldMap::const_iterator end = worldMap().end();
    for (WorldMap::const_iterator it = worldMap().begin(); it != end; ++it) {
        if (it->second == world)
            return it->first;
    }

    return 0;
}

void LayoutTestController::evaluateScriptInIsolatedWorld(unsigned worldID, JSObjectRef globalObject, JSStringRef script)
{
    RetainPtr<CFStringRef> scriptCF(AdoptCF, JSStringCopyCFString(kCFAllocatorDefault, script));
    NSString *scriptNS = (NSString *)scriptCF.get();

    // A worldID of 0 always corresponds to a new world. Any other worldID corresponds to a world
    // that is created once and cached forever.
    WebScriptWorld *world;
    if (!worldID)
        world = [WebScriptWorld world];
    else {
        RetainPtr<WebScriptWorld>& worldSlot = worldMap().add(worldID, 0).first->second;
        if (!worldSlot)
            worldSlot.adoptNS([[WebScriptWorld alloc] init]);
        world = worldSlot.get();
    }

    [mainFrame _stringByEvaluatingJavaScriptFromString:scriptNS withGlobalObject:globalObject inScriptWorld:world];
}