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57bf4bec64
The body background attribute can fail to produce an image style value. Applying presentational hints should ignore the attribute in that case instead of asserting. Add reduced crash coverage for updating style after an invalid body background hint is adopted into the active document.
173 lines
8.1 KiB
C++
173 lines
8.1 KiB
C++
/*
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* Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/HTMLBodyElement.h>
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#include <LibWeb/CSS/ComputedProperties.h>
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#include <LibWeb/CSS/StyleValues/ColorStyleValue.h>
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#include <LibWeb/CSS/StyleValues/ImageStyleValue.h>
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#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
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#include <LibWeb/CSS/StyleValues/StyleValueList.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/Gamepad/EventNames.h>
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#include <LibWeb/HTML/HTMLBodyElement.h>
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#include <LibWeb/HTML/Navigable.h>
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#include <LibWeb/HTML/NavigableContainer.h>
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#include <LibWeb/HTML/Numbers.h>
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#include <LibWeb/HTML/Parser/HTMLParser.h>
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#include <LibWeb/HTML/Window.h>
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#include <LibWeb/Layout/Node.h>
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#include <LibWeb/Painting/Paintable.h>
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namespace Web::HTML {
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GC_DEFINE_ALLOCATOR(HTMLBodyElement);
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HTMLBodyElement::HTMLBodyElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: HTMLElement(document, move(qualified_name))
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{
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}
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HTMLBodyElement::~HTMLBodyElement() = default;
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void HTMLBodyElement::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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}
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void HTMLBodyElement::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(HTMLBodyElement);
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Base::initialize(realm);
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}
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bool HTMLBodyElement::is_presentational_hint(FlyString const& name) const
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{
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if (Base::is_presentational_hint(name))
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return true;
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return first_is_one_of(name,
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HTML::AttributeNames::bgcolor,
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HTML::AttributeNames::text,
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HTML::AttributeNames::background,
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HTML::AttributeNames::marginheight,
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HTML::AttributeNames::marginwidth,
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HTML::AttributeNames::topmargin,
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HTML::AttributeNames::rightmargin,
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HTML::AttributeNames::bottommargin,
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HTML::AttributeNames::leftmargin);
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}
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void HTMLBodyElement::apply_presentational_hints(Vector<CSS::StyleProperty>& properties) const
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{
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Base::apply_presentational_hints(properties);
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for_each_attribute([&](auto& name, auto& value) {
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if (name == HTML::AttributeNames::bgcolor) {
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// https://html.spec.whatwg.org/multipage/rendering.html#the-page:rules-for-parsing-a-legacy-colour-value
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auto color = parse_legacy_color_value(value);
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if (color.has_value())
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properties.append({ .property_id = CSS::PropertyID::BackgroundColor, .value = CSS::ColorStyleValue::create_from_color(color.value(), CSS::ColorSyntax::Legacy) });
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} else if (name == HTML::AttributeNames::text) {
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// https://html.spec.whatwg.org/multipage/rendering.html#the-page:rules-for-parsing-a-legacy-colour-value-2
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auto color = parse_legacy_color_value(value);
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if (color.has_value())
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properties.append({ .property_id = CSS::PropertyID::Color, .value = CSS::ColorStyleValue::create_from_color(color.value(), CSS::ColorSyntax::Legacy) });
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} else if (name == HTML::AttributeNames::background) {
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if (m_background_style_value)
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properties.append({ .property_id = CSS::PropertyID::BackgroundImage, .value = CSS::StyleValueList::create({ *m_background_style_value }, CSS::StyleValueList::Separator::Comma) });
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}
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});
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auto get_margin_value = [&](auto const& first_body_attr_name, auto const& second_body_attr_name, auto const& container_frame_attr_name) -> Optional<String> {
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if (auto value = get_attribute(first_body_attr_name); value.has_value())
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return value.value();
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if (auto value = get_attribute(second_body_attr_name); value.has_value())
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return value.value();
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auto navigable = document().navigable();
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if (!navigable)
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return {};
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auto container = navigable->container();
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if (!container)
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return {};
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if (auto value = container->get_attribute(container_frame_attr_name); value.has_value())
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return value;
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return {};
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};
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auto margin_top_value = get_margin_value(HTML::AttributeNames::marginheight, HTML::AttributeNames::topmargin, HTML::AttributeNames::marginheight);
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auto margin_bottom_value = get_margin_value(HTML::AttributeNames::marginheight, HTML::AttributeNames::bottommargin, HTML::AttributeNames::marginheight);
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auto margin_left_value = get_margin_value(HTML::AttributeNames::marginwidth, HTML::AttributeNames::leftmargin, HTML::AttributeNames::marginwidth);
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auto margin_right_value = get_margin_value(HTML::AttributeNames::marginwidth, HTML::AttributeNames::rightmargin, HTML::AttributeNames::marginwidth);
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auto apply_margin_value = [&](CSS::PropertyID property_id, Optional<String> const& value) {
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if (!value.has_value())
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return;
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if (auto parsed_value = parse_non_negative_integer(value.value()); parsed_value.has_value())
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properties.append({ .property_id = property_id, .value = CSS::LengthStyleValue::create(CSS::Length::make_px(*parsed_value)) });
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};
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apply_margin_value(CSS::PropertyID::MarginTop, margin_top_value);
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apply_margin_value(CSS::PropertyID::MarginBottom, margin_bottom_value);
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apply_margin_value(CSS::PropertyID::MarginLeft, margin_left_value);
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apply_margin_value(CSS::PropertyID::MarginRight, margin_right_value);
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}
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void HTMLBodyElement::attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
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{
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Base::attribute_changed(name, old_value, value, namespace_);
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if (name == HTML::AttributeNames::link) {
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// https://html.spec.whatwg.org/multipage/rendering.html#the-page:rules-for-parsing-a-legacy-colour-value-3
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auto color = parse_legacy_color_value(value.value_or(String {}));
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if (color.has_value())
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document().set_normal_link_color(color.value());
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} else if (name == HTML::AttributeNames::alink) {
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// https://html.spec.whatwg.org/multipage/rendering.html#the-page:rules-for-parsing-a-legacy-colour-value-5
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auto color = parse_legacy_color_value(value.value_or(String {}));
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if (color.has_value())
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document().set_active_link_color(color.value());
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} else if (name == HTML::AttributeNames::vlink) {
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// https://html.spec.whatwg.org/multipage/rendering.html#the-page:rules-for-parsing-a-legacy-colour-value-4
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auto color = parse_legacy_color_value(value.value_or(String {}));
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if (color.has_value())
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document().set_visited_link_color(color.value());
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} else if (name == HTML::AttributeNames::background) {
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// https://html.spec.whatwg.org/multipage/rendering.html#the-page:attr-background
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m_background_style_value = nullptr;
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if (auto maybe_background_url = document().encoding_parse_url(value.value_or(String {})); maybe_background_url.has_value()) {
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m_background_style_value = CSS::ImageStyleValue::create(maybe_background_url.value());
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m_background_style_value->on_animate = [this] {
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if (paintable())
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paintable()->set_needs_repaint();
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};
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}
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}
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#undef __ENUMERATE
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#define __ENUMERATE(attribute_name, event_name) \
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if (name == HTML::AttributeNames::attribute_name) { \
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element_event_handler_attribute_changed(event_name, value); \
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}
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ENUMERATE_WINDOW_EVENT_HANDLERS(__ENUMERATE)
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#undef __ENUMERATE
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}
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GC::Ptr<DOM::EventTarget> HTMLBodyElement::global_event_handlers_to_event_target(FlyString const& event_name)
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{
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// NOTE: This is a little weird, but IIUC document.body.onload actually refers to window.onload
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// NOTE: document.body can return either a HTMLBodyElement or HTMLFrameSetElement, so both these elements must support this mapping.
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if (DOM::is_window_reflecting_body_element_event_handler(event_name))
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return document().window();
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return *this;
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}
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GC::Ptr<DOM::EventTarget> HTMLBodyElement::window_event_handlers_to_event_target()
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{
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// All WindowEventHandlers on HTMLFrameSetElement (e.g. document.body.onrejectionhandled) are mapped to window.on{event}.
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// NOTE: document.body can return either a HTMLBodyElement or HTMLFrameSetElement, so both these elements must support this mapping.
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return document().window();
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}
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}
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