LibWeb: Make Document::page() return a Page&

Now that Document always has a Page, and always keeps it alive, we can
make this return a Page&, exposing various unnecessary null checks.

Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp

@@ -33,7 +33,7 @@ CSSImportRule::CSSImportRule(AK::URL url, DOM::Document& document)
     , m_document(document)
 {
     dbgln_if(CSS_LOADER_DEBUG, "CSSImportRule: Loading import URL: {}", m_url);
-    auto request = LoadRequest::create_for_url_on_page(m_url, document.page());
+    auto request = LoadRequest::create_for_url_on_page(m_url, &document.page());
 
     // NOTE: Mark this rule as delaying the document load event *before* calling set_resource()
     //       as it may trigger a synchronous resource_did_load() callback.

Userland/Libraries/LibWeb/CSS/StyleComputer.cpp

@@ -2334,11 +2334,8 @@ NonnullOwnPtr<StyleComputer::RuleCache> StyleComputer::make_rule_cache_for_casca
 
 void StyleComputer::build_rule_cache()
 {
-    // FIXME: How are we sometimes calculating style before the Document has a Page?
+    if (auto user_style_source = document().page().user_style(); user_style_source.has_value()) {
-    if (document().page()) {
+        m_user_style_sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document()), user_style_source.value()));
-        if (auto user_style_source = document().page()->user_style(); user_style_source.has_value()) {
-            m_user_style_sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document()), user_style_source.value()));
-        }
     }
 
     m_author_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::Author);

Userland/Libraries/LibWeb/CSS/StyleValues/IdentifierStyleValue.cpp

@@ -217,10 +217,7 @@ Color IdentifierStyleValue::to_color(Optional<Layout::NodeWithStyle const&> node
     if (id() == CSS::ValueID::LibwebLink || id() == ValueID::Linktext)
         return document.link_color();
 
-    if (!document.page())
+    auto palette = document.page().palette();
-        return {};
-
-    auto palette = document.page()->palette();
     switch (id()) {
     case CSS::ValueID::LibwebPaletteDesktopBackground:
         return palette.color(ColorRole::DesktopBackground);

Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp

@@ -32,7 +32,7 @@ void ImageStyleValue::load_any_resources(DOM::Document& document)
         return;
     m_document = &document;
 
-    m_image_request = HTML::SharedImageRequest::get_or_create(document.realm(), *document.page(), m_url);
+    m_image_request = HTML::SharedImageRequest::get_or_create(document.realm(), document.page(), m_url);
     m_image_request->add_callbacks(
         [this, weak_this = make_weak_ptr()] {
             if (!weak_this)

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -803,10 +803,8 @@ WebIDL::ExceptionOr<void> Document::set_title(String const& title)
         return {};
     }
 
-    if (auto* page = this->page()) {
+    if (browsing_context() == &page().top_level_browsing_context())
-        if (browsing_context() == &page->top_level_browsing_context())
+        page().client().page_did_change_title(title.to_deprecated_string());
-            page->client().page_did_change_title(title.to_deprecated_string());
-    }
 
     return {};
 }
@@ -1040,8 +1038,7 @@ void Document::update_layout()
         navigable()->set_needs_display();
 
     if (navigable()->is_traversable()) {
-        if (auto* page = this->page())
+        page().client().page_did_layout();
-            page->client().page_did_layout();
     }
 
     m_layout_root->recompute_selection_states();
@@ -1909,12 +1906,12 @@ void Document::update_readiness(HTML::DocumentReadyState readiness_value)
     }
 }
 
-Page* Document::page()
+Page& Document::page()
 {
     return m_page;
 }
 
-Page const* Document::page() const
+Page const& Document::page() const
 {
     return m_page;
 }
@@ -1977,9 +1974,7 @@ void Document::completely_finish_loading()
 
 String Document::cookie(Cookie::Source source)
 {
-    if (auto* page = this->page())
+    return MUST(String::from_deprecated_string(page().client().page_did_request_cookie(m_url, source)));
-        return MUST(String::from_deprecated_string(page->client().page_did_request_cookie(m_url, source)));
-    return String {};
 }
 
 void Document::set_cookie(StringView cookie_string, Cookie::Source source)
@@ -1988,8 +1983,7 @@ void Document::set_cookie(StringView cookie_string, Cookie::Source source)
     if (!cookie.has_value())
         return;
 
-    if (auto* page = this->page())
+    page().client().page_did_set_cookie(m_url, cookie.value(), source);
-        page->client().page_did_set_cookie(m_url, cookie.value(), source);
 }
 
 String Document::dump_dom_tree_as_json() const
@@ -2372,8 +2366,7 @@ void Document::increment_number_of_things_delaying_the_load_event(Badge<Document
 {
     ++m_number_of_things_delaying_the_load_event;
 
-    if (auto* page = this->page())
+    page().client().page_did_update_resource_count(m_number_of_things_delaying_the_load_event);
-        page->client().page_did_update_resource_count(m_number_of_things_delaying_the_load_event);
 }
 
 void Document::decrement_number_of_things_delaying_the_load_event(Badge<DocumentLoadEventDelayer>)
@@ -2381,8 +2374,7 @@ void Document::decrement_number_of_things_delaying_the_load_event(Badge<Document
     VERIFY(m_number_of_things_delaying_the_load_event);
     --m_number_of_things_delaying_the_load_event;
 
-    if (auto* page = this->page())
+    page().client().page_did_update_resource_count(m_number_of_things_delaying_the_load_event);
-        page->client().page_did_update_resource_count(m_number_of_things_delaying_the_load_event);
 }
 
 bool Document::anything_is_delaying_the_load_event() const
@@ -2726,7 +2718,7 @@ void Document::run_unloading_cleanup_steps()
 // https://html.spec.whatwg.org/multipage/document-lifecycle.html#destroy-a-document
 void Document::destroy()
 {
-    page()->client().page_did_destroy_document(*this);
+    page().client().page_did_destroy_document(*this);
 
     // NOTE: Abort needs to happen before destory. There is currently bug in the spec: https://github.com/whatwg/html/issues/9148
     // 4. Abort document.

Userland/Libraries/LibWeb/DOM/Document.h

@@ -181,8 +181,8 @@ public:
 
     void set_browsing_context(HTML::BrowsingContext*);
 
-    Page* page();
+    Page& page();
-    Page const* page() const;
+    Page const& page() const;
 
     Color background_color() const;
     Vector<CSS::BackgroundLayerData> const* background_layers() const;

Userland/Libraries/LibWeb/DOM/Element.cpp

@@ -1188,22 +1188,16 @@ void Element::set_scroll_left(double x)
     // 8. If the element is the root element invoke scroll() on window with x as first argument and scrollY on window as second argument, and terminate these steps.
     if (document.document_element() == this) {
         // FIXME: Implement this in terms of invoking scroll() on window.
-        if (auto* page = document.page()) {
+        if (document.browsing_context() == &document.page().top_level_browsing_context())
-            if (document.browsing_context() == &page->top_level_browsing_context())
+            document.page().client().page_did_request_scroll_to({ static_cast<float>(x), static_cast<float>(window->scroll_y()) });
-                page->client().page_did_request_scroll_to({ static_cast<float>(x), static_cast<float>(window->scroll_y()) });
-        }
-
         return;
     }
 
     // 9. If the element is the body element, document is in quirks mode, and the element is not potentially scrollable, invoke scroll() on window with x as first argument and scrollY on window as second argument, and terminate these steps.
     if (document.body() == this && document.in_quirks_mode() && !is_potentially_scrollable()) {
         // FIXME: Implement this in terms of invoking scroll() on window.
-        if (auto* page = document.page()) {
+        if (document.browsing_context() == &document.page().top_level_browsing_context())
-            if (document.browsing_context() == &page->top_level_browsing_context())
+            document.page().client().page_did_request_scroll_to({ static_cast<float>(x), static_cast<float>(window->scroll_y()) });
-                page->client().page_did_request_scroll_to({ static_cast<float>(x), static_cast<float>(window->scroll_y()) });
-        }
-
         return;
     }
 
@@ -1256,22 +1250,16 @@ void Element::set_scroll_top(double y)
     // 8. If the element is the root element invoke scroll() on window with scrollX on window as first argument and y as second argument, and terminate these steps.
     if (document.document_element() == this) {
         // FIXME: Implement this in terms of invoking scroll() on window.
-        if (auto* page = document.page()) {
+        if (document.browsing_context() == &document.page().top_level_browsing_context())
-            if (document.browsing_context() == &page->top_level_browsing_context())
+            document.page().client().page_did_request_scroll_to({ static_cast<float>(window->scroll_x()), static_cast<float>(y) });
-                page->client().page_did_request_scroll_to({ static_cast<float>(window->scroll_x()), static_cast<float>(y) });
-        }
-
         return;
     }
 
     // 9. If the element is the body element, document is in quirks mode, and the element is not potentially scrollable, invoke scroll() on window with scrollX as first argument and y as second argument, and terminate these steps.
     if (document.body() == this && document.in_quirks_mode() && !is_potentially_scrollable()) {
         // FIXME: Implement this in terms of invoking scroll() on window.
-        if (auto* page = document.page()) {
+        if (document.browsing_context() == &document.page().top_level_browsing_context())
-            if (document.browsing_context() == &page->top_level_browsing_context())
+            document.page().client().page_did_request_scroll_to({ static_cast<float>(window->scroll_x()), static_cast<float>(y) });
-                page->client().page_did_request_scroll_to({ static_cast<float>(window->scroll_x()), static_cast<float>(y) });
-        }
-
         return;
     }
 

Userland/Libraries/LibWeb/Fetch/Fetching/Fetching.cpp

@@ -1425,10 +1425,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<PendingResponse>> http_network_or_cache_fet
                     auto document = Bindings::host_defined_environment_settings_object(realm).responsible_document();
                     if (!document)
                         return DeprecatedString::empty();
-                    auto* page = document->page();
+                    return document->page().client().page_did_request_cookie(http_request->current_url(), Cookie::Source::Http);
-                    if (!page)
-                        return DeprecatedString::empty();
-                    return page->client().page_did_request_cookie(http_request->current_url(), Cookie::Source::Http);
                 })();
 
                 // 2. If cookies is not the empty string, then append (`Cookie`, cookies) to httpRequest’s header list.

Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp

@@ -57,7 +57,7 @@ void HTMLImageElement::initialize(JS::Realm& realm)
     Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLImageElementPrototype>(realm, "HTMLImageElement"_fly_string));
 
-    m_current_request = ImageRequest::create(realm, *document().page());
+    m_current_request = ImageRequest::create(realm, document().page());
 }
 
 void HTMLImageElement::adopted_from(DOM::Document& old_document)
@@ -385,7 +385,7 @@ ErrorOr<void> HTMLImageElement::update_the_image_data(bool restart_animations, b
             m_pending_request = nullptr;
 
             // 4. Let current request be a new image request whose image data is that of the entry and whose state is completely available.
-            m_current_request = ImageRequest::create(realm(), *document().page());
+            m_current_request = ImageRequest::create(realm(), document().page());
             m_current_request->set_image_data(entry->image_data);
             m_current_request->set_state(ImageRequest::State::CompletelyAvailable);
 
@@ -512,7 +512,7 @@ after_step_7:
         //         multiple image elements (as well as CSS background-images, etc.)
 
         // 16. Set image request to a new image request whose current URL is urlString.
-        auto image_request = ImageRequest::create(realm(), *document().page());
+        auto image_request = ImageRequest::create(realm(), document().page());
         image_request->set_current_url(realm(), url_string);
 
         // 17. If current request's state is unavailable or broken, then set the current request to image request.
@@ -707,7 +707,7 @@ void HTMLImageElement::react_to_changes_in_the_environment()
         key.origin = document().origin();
 
     // 11. ⌛ Let image request be a new image request whose current URL is urlString
-    auto image_request = ImageRequest::create(realm(), *document().page());
+    auto image_request = ImageRequest::create(realm(), document().page());
     image_request->set_current_url(realm(), url_string);
 
     // 12. ⌛ Let the element's pending request be image request.

Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp

@@ -70,7 +70,7 @@ void HTMLLinkElement::inserted()
         ResourceLoader::the().preconnect(document().parse_url(deprecated_attribute(HTML::AttributeNames::href)));
     } else if (m_relationship & Relationship::Icon) {
         auto favicon_url = document().parse_url(href());
-        auto favicon_request = LoadRequest::create_for_url_on_page(favicon_url, document().page());
+        auto favicon_request = LoadRequest::create_for_url_on_page(favicon_url, &document().page());
         set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, favicon_request));
     }
 }

Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp

@@ -57,9 +57,6 @@ void HTMLMetaElement::inserted()
     auto name = attribute(AttributeNames::name);
     auto content = attribute(AttributeNames::content);
     if (name.has_value() && name->bytes_as_string_view().equals_ignoring_ascii_case("theme-color"sv) && content.has_value()) {
-        auto* page = document().page();
-        if (!page)
-            return;
         auto context = CSS::Parser::ParsingContext { document() };
 
         // 2. For each element in candidate elements:
@@ -82,7 +79,7 @@ void HTMLMetaElement::inserted()
         auto color = css_value->as_color().color();
 
         // 4. If color is not failure, then return color.
-        page->client().page_did_change_theme_color(color);
+        document().page().client().page_did_change_theme_color(color);
         return;
     }
 

Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp

@@ -138,7 +138,7 @@ void HTMLObjectElement::queue_element_task_to_run_object_representation_steps()
             }
 
             // 4. Let request be a new request whose URL is the resulting URL record, client is the element's node document's relevant settings object, destination is "object", credentials mode is "include", mode is "navigate", and whose use-URL-credentials flag is set.
-            auto request = LoadRequest::create_for_url_on_page(url, document().page());
+            auto request = LoadRequest::create_for_url_on_page(url, &document().page());
 
             // 5. Fetch request, with processResponseEndOfBody given response res set to finalize and report timing with res, the element's node document's relevant global object, and "object".
             //    Fetching the resource must delay the load event of the element's node document until the task that is queued by the networking task source once the resource has been fetched (defined next) has been run.
@@ -316,7 +316,7 @@ void HTMLObjectElement::load_image()
     // NOTE: This currently reloads the image instead of reusing the resource we've already downloaded.
     auto data = deprecated_attribute(HTML::AttributeNames::data);
     auto url = document().parse_url(data);
-    m_image_request = HTML::SharedImageRequest::get_or_create(realm(), *document().page(), url);
+    m_image_request = HTML::SharedImageRequest::get_or_create(realm(), document().page(), url);
     m_image_request->add_callbacks(
         [this] {
             run_object_representation_completed_steps(Representation::Image);

Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp

@@ -69,9 +69,8 @@ WebIDL::ExceptionOr<void> NavigableContainer::create_new_child_navigable()
     VERIFY(group);
 
     // 3. Let browsingContext and document be the result of creating a new browsing context and document given element's node document, element, and group.
-    auto* page = document().page();
+    auto& page = document().page();
-    VERIFY(page);
+    auto [browsing_context, document] = TRY(BrowsingContext::create_a_new_browsing_context_and_document(page, this->document(), *this, *group));
-    auto [browsing_context, document] = TRY(BrowsingContext::create_a_new_browsing_context_and_document(*page, this->document(), *this, *group));
 
     // 4. Let targetName be null.
     Optional<String> target_name;

Userland/Libraries/LibWeb/HTML/Scripting/Environments.cpp

@@ -292,7 +292,7 @@ bool EnvironmentSettingsObject::is_scripting_enabled() const
     // The user has not disabled scripting for settings at this time. (User agents may provide users with the option to disable scripting globally, or in a finer-grained manner, e.g., on a per-origin basis, down to the level of individual environment settings objects.)
     auto document = const_cast<EnvironmentSettingsObject&>(*this).responsible_document();
     VERIFY(document);
-    if (!document->page() || !document->page()->is_scripting_enabled())
+    if (!document->page().is_scripting_enabled())
         return false;
 
     // FIXME: Either settings's global object is not a Window object, or settings's global object's associated Document's active sandboxing flag set does not have its sandboxed scripts browsing context flag set.

Userland/Libraries/LibWeb/HTML/Window.cpp

@@ -429,12 +429,12 @@ bool Window::dispatch_event(DOM::Event& event)
 
 Page* Window::page()
 {
-    return associated_document().page();
+    return &associated_document().page();
 }
 
 Page const* Window::page() const
 {
-    return associated_document().page();
+    return &associated_document().page();
 }
 
 Optional<CSS::MediaFeatureValue> Window::query_media_feature(CSS::MediaFeatureID media_feature) const

Userland/Libraries/LibWeb/Layout/Node.cpp

@@ -752,7 +752,7 @@ void NodeWithStyle::apply_style(const CSS::StyleProperties& computed_style)
                 VERIFY_NOT_REACHED();
             };
 
-            border.width = snap_a_length_as_a_border_width(document().page()->client().device_pixels_per_css_pixel(), resolve_border_width());
+            border.width = snap_a_length_as_a_border_width(document().page().client().device_pixels_per_css_pixel(), resolve_border_width());
         }
     };
 

Userland/Libraries/LibWeb/SVG/SVGTitleElement.cpp

@@ -33,16 +33,14 @@ void SVGTitleElement::children_changed()
 {
     Base::children_changed();
 
-    auto* page = document().page();
+    auto& page = document().page();
-    if (!page)
+    if (document().browsing_context() != &page.top_level_browsing_context())
-        return;
-    if (document().browsing_context() != &page->top_level_browsing_context())
         return;
 
     auto* document_element = document().document_element();
 
     if (document_element == parent() && is<SVGElement>(document_element))
-        page->client().page_did_change_title(document().title().to_deprecated_string());
+        page.client().page_did_change_title(document().title().to_deprecated_string());
 }
 
 }