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2f02ccc5c1
StylePropertyMap only ever works with style properties - never descriptors. Switching `has_property()` and `get_property_style_value()` to taking PropertyNameAndID skips some duplicate work.
189 lines
9 KiB
C++
189 lines
9 KiB
C++
/*
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* Copyright (c) 2025, Sam Atkins <sam@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 "StylePropertyMapReadOnly.h"
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/StylePropertyMapReadOnlyPrototype.h>
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#include <LibWeb/CSS/CSSStyleDeclaration.h>
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#include <LibWeb/CSS/PropertyNameAndID.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(StylePropertyMapReadOnly);
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GC::Ref<StylePropertyMapReadOnly> StylePropertyMapReadOnly::create_computed_style(JS::Realm& realm, DOM::AbstractElement element)
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{
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return realm.create<StylePropertyMapReadOnly>(realm, element);
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}
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StylePropertyMapReadOnly::StylePropertyMapReadOnly(JS::Realm& realm, Source source)
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: Bindings::PlatformObject(realm)
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, m_declarations(move(source))
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{
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}
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StylePropertyMapReadOnly::~StylePropertyMapReadOnly() = default;
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void StylePropertyMapReadOnly::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(StylePropertyMapReadOnly);
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Base::initialize(realm);
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}
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void StylePropertyMapReadOnly::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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m_declarations.visit(
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[&visitor](DOM::AbstractElement& element) { element.visit(visitor); },
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[&visitor](GC::Ref<CSSStyleDeclaration>& declaration) { visitor.visit(declaration); });
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymapreadonly-get
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WebIDL::ExceptionOr<Variant<GC::Ref<CSSStyleValue>, Empty>> StylePropertyMapReadOnly::get(String property_name)
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{
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// The get(property) method, when called on a StylePropertyMapReadOnly this, must perform the following steps:
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// 1. If property is not a custom property name string, set property to property ASCII lowercased.
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// 2. If property is not a valid CSS property, throw a TypeError.
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auto property = PropertyNameAndID::from_name(property_name);
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if (!property.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("'{}' is not a valid CSS property", property_name)) };
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// 3. Let props be the value of this’s [[declarations]] internal slot.
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auto& props = m_declarations;
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// 4. If props[property] exists, subdivide into iterations props[property], then reify the first item of the result and return it.
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if (auto property_value = get_style_value(props, property.value())) {
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// FIXME: Subdivide into iterations, and only reify/return the first.
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return property_value->reify(realm(), property->name());
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}
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// 5. Otherwise, return undefined.
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return Empty {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymapreadonly-getall
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WebIDL::ExceptionOr<Vector<GC::Ref<CSSStyleValue>>> StylePropertyMapReadOnly::get_all(String property_name)
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{
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// The getAll(property) method, when called on a StylePropertyMap this, must perform the following steps:
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// 1. If property is not a custom property name string, set property to property ASCII lowercased.
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// 2. If property is not a valid CSS property, throw a TypeError.
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auto property = PropertyNameAndID::from_name(property_name);
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if (!property.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("'{}' is not a valid CSS property", property_name)) };
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// 3. Let props be the value of this’s [[declarations]] internal slot.
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auto& props = m_declarations;
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// 4. If props[property] exists, subdivide into iterations props[property], then reify each item of the result, and return the list.
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if (auto property_value = get_style_value(props, property.value())) {
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// FIXME: Subdivide into iterations.
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return Vector { property_value->reify(realm(), property->name()) };
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}
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// 5. Otherwise, return an empty list.
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return Vector<GC::Ref<CSSStyleValue>> {};
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymapreadonly-has
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WebIDL::ExceptionOr<bool> StylePropertyMapReadOnly::has(String property_name)
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{
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// The has(property) method, when called on a StylePropertyMapReadOnly this, must perform the following steps:
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// 1. If property is not a custom property name string, set property to property ASCII lowercased.
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// 2. If property is not a valid CSS property, throw a TypeError.
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auto property = PropertyNameAndID::from_name(property_name);
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if (!property.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("'{}' is not a valid CSS property", property_name)) };
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// 3. Let props be the value of this’s [[declarations]] internal slot.
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auto& props = m_declarations;
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// 4. If props[property] exists, return true. Otherwise, return false.
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return props.visit(
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[&property](DOM::AbstractElement& element) {
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// From https://drafts.css-houdini.org/css-typed-om-1/#dom-element-computedstylemap we need to include:
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// "the name and computed value of every longhand CSS property supported by the User Agent, every
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// registered custom property, and every non-registered custom property which is not set to its initial
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// value on this"
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// Ensure style is computed on the element before we try to read it, so we can check custom properties.
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element.document().update_style();
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if (property->is_custom_property()) {
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if (element.get_custom_property(property->name()))
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return true;
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return element.document().registered_custom_properties().contains(property->name());
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}
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return true;
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},
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[&property](GC::Ref<CSSStyleDeclaration>& declaration) {
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return declaration->has_property(property.value());
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});
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymapreadonly-size
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WebIDL::UnsignedLong StylePropertyMapReadOnly::size() const
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{
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// The size attribute, on getting from a StylePropertyMapReadOnly this, must perform the following steps:
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// 1. Return the size of the value of this’s [[declarations]] internal slot.
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return m_declarations.visit(
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[](DOM::AbstractElement const& element) {
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// From https://drafts.css-houdini.org/css-typed-om-1/#dom-element-computedstylemap we need to include:
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// "the name and computed value of every longhand CSS property supported by the User Agent, every
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// registered custom property, and every non-registered custom property which is not set to its initial
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// value on this"
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// Ensure style is computed on the element before we try to read it.
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element.document().update_style();
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// Some custom properties set on the element might also be in the registered custom properties set, so we
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// want the size of the union of the two sets.
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HashTable<FlyString> custom_properties;
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for (auto const& key : element.custom_properties().keys())
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custom_properties.set(key);
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for (auto const& [key, _] : element.document().registered_custom_properties())
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custom_properties.set(key);
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return number_of_longhand_properties + custom_properties.size();
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},
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[](GC::Ref<CSSStyleDeclaration> const& declaration) { return declaration->length(); });
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}
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RefPtr<StyleValue const> StylePropertyMapReadOnly::get_style_value(Source& source, PropertyNameAndID const& property)
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{
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return source.visit(
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[&property](DOM::AbstractElement& element) -> RefPtr<StyleValue const> {
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// From https://drafts.css-houdini.org/css-typed-om-1/#dom-element-computedstylemap we need to include:
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// "the name and computed value of every longhand CSS property supported by the User Agent, every
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// registered custom property, and every non-registered custom property which is not set to its initial
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// value on this"
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// Ensure style is computed on the element before we try to read it.
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element.document().update_style();
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if (property.is_custom_property()) {
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if (auto custom_property = element.get_custom_property(property.name()))
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return custom_property;
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if (auto registered_custom_property = element.document().registered_custom_properties().get(property.name()); registered_custom_property.has_value())
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return registered_custom_property.value()->initial_style_value();
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return nullptr;
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}
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if (property.id() >= first_longhand_property_id && property.id() <= last_longhand_property_id) {
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// FIXME: This will only ever be null for pseudo-elements. What should we do in that case?
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if (auto computed_properties = element.computed_properties())
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return computed_properties->property(property.id());
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}
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return nullptr;
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},
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[&property](GC::Ref<CSSStyleDeclaration>& declaration) {
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return declaration->get_property_style_value(property);
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});
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}
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}
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