webview.mm

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    //    2) unload events need to be called
    if (applicationIsTerminating && !fullDocumentTeardown) {
        [self _closeWithFastTeardown];
        return;
    }

    if (Frame* mainFrame = core([self mainFrame]))
        mainFrame->loader()->detachFromParent();

    [self _removeFromAllWebViewsSet];
    [self setHostWindow:nil];

    [self setDownloadDelegate:nil];
    [self setEditingDelegate:nil];
    [self setFrameLoadDelegate:nil];
    [self setPolicyDelegate:nil];
    [self setResourceLoadDelegate:nil];
    [self setScriptDebugDelegate:nil];
    [self setUIDelegate:nil];

    [_private->inspector webViewClosed];

    // setHostWindow:nil must be called before this value is set (see 5408186)
    _private->closed = YES;

    // To avoid leaks, call removeDragCaret in case it wasn't called after moveDragCaretToPoint.
    [self removeDragCaret];

    // Deleteing the WebCore::Page will clear the page cache so we call destroy on 
    // all the plug-ins in the page cache to break any retain cycles.
    // See comment in HistoryItem::releaseAllPendingPageCaches() for more information.
    delete _private->page;
    _private->page = 0;

    if (_private->hasSpellCheckerDocumentTag) {
        [[NSSpellChecker sharedSpellChecker] closeSpellDocumentWithTag:_private->spellCheckerDocumentTag];
        _private->hasSpellCheckerDocumentTag = NO;
    }
    
    [[NSDistributedNotificationCenter defaultCenter] removeObserver:self];
    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [WebPreferences _removeReferenceForIdentifier:[self preferencesIdentifier]];

    _private->preferences = nil;
    [preferences didRemoveFromWebView];
    [preferences release];

    [self _closePluginDatabases];

#ifndef NDEBUG
    // Need this to make leak messages accurate.
    if (applicationIsTerminating) {
        gcController().garbageCollectNow();
        [WebCache setDisabled:YES];
    }
#endif
}

+ (NSString *)_MIMETypeForFile:(NSString *)path
{
    NSString *extension = [path pathExtension];
    NSString *MIMEType = nil;

    // Get the MIME type from the extension.
    if ([extension length] != 0) {
        MIMEType = WKGetMIMETypeForExtension(extension);
    }

    // If we can't get a known MIME type from the extension, sniff.
    if ([MIMEType length] == 0 || [MIMEType isEqualToString:@"application/octet-stream"]) {
        NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
        NSData *data = [handle readDataOfLength:WEB_GUESS_MIME_TYPE_PEEK_LENGTH];
        [handle closeFile];
        if ([data length] != 0) {
            MIMEType = [data _webkit_guessedMIMEType];
        }
        if ([MIMEType length] == 0) {
            MIMEType = @"application/octet-stream";
        }
    }

    return MIMEType;
}

- (WebDownload *)_downloadURL:(NSURL *)URL
{
    ASSERT(URL);
    
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:URL];
    WebDownload *download = [WebDownload _downloadWithRequest:request
                                                     delegate:_private->downloadDelegate
                                                    directory:nil];
    [request release];
    
    return download;
}

- (WebView *)_openNewWindowWithRequest:(NSURLRequest *)request
{
    NSDictionary *features = [[NSDictionary alloc] init];
    WebView *newWindowWebView = [[self _UIDelegateForwarder] webView:self
                                            createWebViewWithRequest:nil
                                                      windowFeatures:features];
    [features release];
    if (!newWindowWebView)
        return nil;

    CallUIDelegate(newWindowWebView, @selector(webViewShow:));
    return newWindowWebView;
}

- (WebInspector *)inspector
{
    if (!_private->inspector)
        _private->inspector = [[WebInspector alloc] initWithWebView:self];
    return _private->inspector;
}

- (WebCore::Page*)page
{
    return _private->page;
}

- (NSMenu *)_menuForElement:(NSDictionary *)element defaultItems:(NSArray *)items
{
    NSArray *defaultMenuItems = [[WebDefaultUIDelegate sharedUIDelegate] webView:self contextMenuItemsForElement:element defaultMenuItems:items];

    NSArray *menuItems = CallUIDelegate(self, @selector(webView:contextMenuItemsForElement:defaultMenuItems:), element, defaultMenuItems);
    if (!menuItems)
        return nil;

    unsigned count = [menuItems count];
    if (!count)
        return nil;

    NSMenu *menu = [[NSMenu alloc] init];
    for (unsigned i = 0; i < count; i++)
        [menu addItem:[menuItems objectAtIndex:i]];

    return [menu autorelease];
}

- (void)_mouseDidMoveOverElement:(NSDictionary *)dictionary modifierFlags:(NSUInteger)modifierFlags
{
    // We originally intended to call this delegate method sometimes with a nil dictionary, but due to
    // a bug dating back to WebKit 1.0 this delegate was never called with nil! Unfortunately we can't
    // start calling this with nil since it will break Adobe Help Viewer, and possibly other clients.
    if (!dictionary)
        return;
    CallUIDelegate(self, @selector(webView:mouseDidMoveOverElement:modifierFlags:), dictionary, modifierFlags);
}

- (void)_loadBackForwardListFromOtherView:(WebView *)otherView
{
    if (!_private->page)
        return;
    
    if (!otherView->_private->page)
        return;
    
    // It turns out the right combination of behavior is done with the back/forward load
    // type.  (See behavior matrix at the top of WebFramePrivate.)  So we copy all the items
    // in the back forward list, and go to the current one.

    BackForwardList* backForwardList = _private->page->backForwardList();
    ASSERT(!backForwardList->currentItem()); // destination list should be empty

    BackForwardList* otherBackForwardList = otherView->_private->page->backForwardList();
    if (!otherBackForwardList->currentItem())
        return; // empty back forward list, bail
    
    HistoryItem* newItemToGoTo = 0;

    int lastItemIndex = otherBackForwardList->forwardListCount();
    for (int i = -otherBackForwardList->backListCount(); i <= lastItemIndex; ++i) {
        if (i == 0) {
            // If this item is showing , save away its current scroll and form state,
            // since that might have changed since loading and it is normally not saved
            // until we leave that page.
            otherView->_private->page->mainFrame()->loader()->saveDocumentAndScrollState();
        }
        RefPtr<HistoryItem> newItem = otherBackForwardList->itemAtIndex(i)->copy();
        if (i == 0) 
            newItemToGoTo = newItem.get();
        backForwardList->addItem(newItem.release());
    }
    
    ASSERT(newItemToGoTo);
    _private->page->goToItem(newItemToGoTo, FrameLoadTypeIndexedBackForward);
}

- (void)_setFormDelegate: (id<WebFormDelegate>)delegate
{
    _private->formDelegate = delegate;
}

- (id<WebFormDelegate>)_formDelegate
{
    return _private->formDelegate;
}

- (BOOL)_needsAdobeFrameReloadingQuirk
{
    static BOOL checked = NO;
    static BOOL needsQuirk = NO;

    if (checked)
        return needsQuirk;

    needsQuirk = WKAppVersionCheckLessThan(@"com.adobe.Acrobat", -1, 9.0)
        || WKAppVersionCheckLessThan(@"com.adobe.Acrobat.Pro", -1, 9.0)
        || WKAppVersionCheckLessThan(@"com.adobe.Reader", -1, 9.0)
        || WKAppVersionCheckLessThan(@"com.adobe.distiller", -1, 9.0)
        || WKAppVersionCheckLessThan(@"com.adobe.Contribute", -1, 4.2)
        || WKAppVersionCheckLessThan(@"com.adobe.dreamweaver-9.0", -1, 9.1)
        || WKAppVersionCheckLessThan(@"com.macromedia.fireworks", -1, 9.1)
        || WKAppVersionCheckLessThan(@"com.adobe.InCopy", -1, 5.1)
        || WKAppVersionCheckLessThan(@"com.adobe.InDesign", -1, 5.1)
        || WKAppVersionCheckLessThan(@"com.adobe.Soundbooth", -1, 2);
    checked = YES;

    return needsQuirk;
}

- (BOOL)_needsKeyboardEventDisambiguationQuirks
{
    static BOOL checked = NO;
    static BOOL needsQuirks = NO;

    if (checked)
        return needsQuirks;

    needsQuirks = !WebKitLinkedOnOrAfter(WEBKIT_FIRST_VERSION_WITH_IE_COMPATIBLE_KEYBOARD_EVENT_DISPATCH)
        && ![[[NSBundle mainBundle] bundleIdentifier] isEqualToString:@"com.apple.Safari"];
    checked = YES;

    return needsQuirks;
}

- (void)_preferencesChangedNotification:(NSNotification *)notification
{
    WebPreferences *preferences = (WebPreferences *)[notification object];
    ASSERT(preferences == [self preferences]);
    
    if (!_private->userAgentOverridden)
        _private->userAgent = String();

    // Cache this value so we don't have to read NSUserDefaults on each page load
    _private->useSiteSpecificSpoofing = [preferences _useSiteSpecificSpoofing];

    // Update corresponding WebCore Settings object.
    if (!_private->page)
        return;
    
    Settings* settings = _private->page->settings();
    
    settings->setCursiveFontFamily([preferences cursiveFontFamily]);
    settings->setDefaultFixedFontSize([preferences defaultFixedFontSize]);
    settings->setDefaultFontSize([preferences defaultFontSize]);
    settings->setDefaultTextEncodingName([preferences defaultTextEncodingName]);
    settings->setFantasyFontFamily([preferences fantasyFontFamily]);
    settings->setFixedFontFamily([preferences fixedFontFamily]);
    settings->setForceFTPDirectoryListings([preferences _forceFTPDirectoryListings]);
    settings->setFTPDirectoryTemplatePath([preferences _ftpDirectoryTemplatePath]);
    settings->setLocalStorageDatabasePath([preferences _localStorageDatabasePath]);
    settings->setJavaEnabled([preferences isJavaEnabled]);
    settings->setJavaScriptEnabled([preferences isJavaScriptEnabled]);
    settings->setWebSecurityEnabled([preferences isWebSecurityEnabled]);
    settings->setAllowUniversalAccessFromFileURLs([preferences allowUniversalAccessFromFileURLs]);
    settings->setJavaScriptCanOpenWindowsAutomatically([preferences javaScriptCanOpenWindowsAutomatically]);
    settings->setMinimumFontSize([preferences minimumFontSize]);
    settings->setMinimumLogicalFontSize([preferences minimumLogicalFontSize]);
    settings->setPluginsEnabled([preferences arePlugInsEnabled]);
    settings->setDatabasesEnabled([preferences databasesEnabled]);
    settings->setLocalStorageEnabled([preferences localStorageEnabled]);
    settings->setPrivateBrowsingEnabled([preferences privateBrowsingEnabled]);
    settings->setSansSerifFontFamily([preferences sansSerifFontFamily]);
    settings->setSerifFontFamily([preferences serifFontFamily]);
    settings->setStandardFontFamily([preferences standardFontFamily]);
    settings->setLoadsImagesAutomatically([preferences loadsImagesAutomatically]);
    settings->setShouldPrintBackgrounds([preferences shouldPrintBackgrounds]);
    settings->setTextAreasAreResizable([preferences textAreasAreResizable]);
    settings->setShrinksStandaloneImagesToFit([preferences shrinksStandaloneImagesToFit]);
    settings->setEditableLinkBehavior(core([preferences editableLinkBehavior]));
    settings->setTextDirectionSubmenuInclusionBehavior(core([preferences textDirectionSubmenuInclusionBehavior]));
    settings->setDOMPasteAllowed([preferences isDOMPasteAllowed]);
    settings->setUsesPageCache([self usesPageCache]);
    settings->setShowsURLsInToolTips([preferences showsURLsInToolTips]);
    settings->setDeveloperExtrasEnabled([preferences developerExtrasEnabled]);
    settings->setAuthorAndUserStylesEnabled([preferences authorAndUserStylesEnabled]);
    settings->setApplicationChromeMode([preferences applicationChromeModeEnabled]);
    if ([preferences userStyleSheetEnabled]) {
        NSString* location = [[preferences userStyleSheetLocation] _web_originalDataAsString];
        settings->setUserStyleSheetLocation([NSURL URLWithString:(location ? location : @"")]);
    } else
        settings->setUserStyleSheetLocation([NSURL URLWithString:@""]);
    settings->setNeedsAdobeFrameReloadingQuirk([self _needsAdobeFrameReloadingQuirk]);
    settings->setNeedsKeyboardEventDisambiguationQuirks([self _needsKeyboardEventDisambiguationQuirks]);
    settings->setNeedsSiteSpecificQuirks(_private->useSiteSpecificSpoofing);
    settings->setWebArchiveDebugModeEnabled([preferences webArchiveDebugModeEnabled]);
    settings->disableRangeMutationForOldAppleMail(WKAppVersionCheckLessThan(@"com.apple.mail", -1, 4.0));
    settings->setOfflineWebApplicationCacheEnabled([preferences offlineWebApplicationCacheEnabled]);
    settings->setZoomsTextOnly([preferences zoomsTextOnly]);
    settings->setEnforceCSSMIMETypeInStrictMode(!WKAppVersionCheckLessThan(@"com.apple.iWeb", -1, 2.1));
}

static inline IMP getMethod(id o, SEL s)
{
    return [o respondsToSelector:s] ? [o methodForSelector:s] : 0;
}

- (void)_cacheResourceLoadDelegateImplementations
{
    WebResourceDelegateImplementationCache *cache = &_private->resourceLoadDelegateImplementations;
    id delegate = _private->resourceProgressDelegate;

    if (!delegate) {
        bzero(cache, sizeof(WebResourceDelegateImplementationCache));
        return;
    }

    cache->didCancelAuthenticationChallengeFunc = getMethod(delegate, @selector(webView:resource:didReceiveAuthenticationChallenge:fromDataSource:));
    cache->didFailLoadingWithErrorFromDataSourceFunc = getMethod(delegate, @selector(webView:resource:didFailLoadingWithError:fromDataSource:));
    cache->didFinishLoadingFromDataSourceFunc = getMethod(delegate, @selector(webView:resource:didFinishLoadingFromDataSource:));
    cache->didLoadResourceFromMemoryCacheFunc = getMethod(delegate, @selector(webView:didLoadResourceFromMemoryCache:response:length:fromDataSource:));
    cache->didReceiveAuthenticationChallengeFunc = getMethod(delegate, @selector(webView:resource:didReceiveAuthenticationChallenge:fromDataSource:));
    cache->didReceiveContentLengthFunc = getMethod(delegate, @selector(webView:resource:didReceiveContentLength:fromDataSource:));
    cache->didReceiveResponseFunc = getMethod(delegate, @selector(webView:resource:didReceiveResponse:fromDataSource:));
    cache->identifierForRequestFunc = getMethod(delegate, @selector(webView:identifierForInitialRequest:fromDataSource:));
    cache->plugInFailedWithErrorFunc = getMethod(delegate, @selector(webView:plugInFailedWithError:dataSource:));
    cache->willCacheResponseFunc = getMethod(delegate, @selector(webView:resource:willCacheResponse:fromDataSource:));
    cache->willSendRequestFunc = getMethod(delegate, @selector(webView:resource:willSendRequest:redirectResponse:fromDataSource:));
    cache->shouldUseCredentialStorageFunc = getMethod(delegate, @selector(webView:resource:shouldUseCredentialStorageForDataSource:));
}

WebResourceDelegateImplementationCache* WebViewGetResourceLoadDelegateImplementations(WebView *webView)
{
    static WebResourceDelegateImplementationCache empty;
    if (!webView)
        return &empty;
    return &webView->_private->resourceLoadDelegateImplementations;
}

- (void)_cacheFrameLoadDelegateImplementations
{
    WebFrameLoadDelegateImplementationCache *cache = &_private->frameLoadDelegateImplementations;
    id delegate = _private->frameLoadDelegate;

    if (!delegate) {