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07d77e89dd
This algorithm is used by Typed-OM for producing a list of internal style values from a single one, for properties that take a list. We will probably need to implement this for more StyleValues later.
136 lines
5 KiB
C++
136 lines
5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
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* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "StyleValueList.h"
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#include <LibGC/RootVector.h>
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#include <LibJS/Runtime/Realm.h>
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#include <LibWeb/CSS/CSSTransformComponent.h>
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#include <LibWeb/CSS/CSSTransformValue.h>
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#include <LibWeb/CSS/Parser/ComponentValue.h>
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#include <LibWeb/CSS/PropertyNameAndID.h>
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#include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
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namespace Web::CSS {
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bool StyleValueList::Properties::operator==(Properties const& other) const
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{
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return separator == other.separator && values.span() == other.values.span();
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}
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ValueComparingNonnullRefPtr<StyleValue const> StyleValueList::absolutized(ComputationContext const& computation_context) const
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{
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StyleValueVector absolutized_style_values;
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absolutized_style_values.ensure_capacity(m_properties.values.size());
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bool any_absolutized = false;
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for (auto const& value : m_properties.values) {
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auto absolutized_style_value = value->absolutized(computation_context);
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if (absolutized_style_value != value)
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any_absolutized = true;
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absolutized_style_values.append(value->absolutized(computation_context));
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}
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if (!any_absolutized)
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return *this;
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return StyleValueList::create(move(absolutized_style_values), m_properties.separator);
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}
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String StyleValueList::to_string(SerializationMode mode) const
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{
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if (m_properties.values.is_empty())
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return {};
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auto separator = ""sv;
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switch (m_properties.separator) {
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case Separator::Space:
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separator = " "sv;
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break;
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case Separator::Comma:
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separator = ", "sv;
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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auto first_value = m_properties.values.first();
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if (all_of(m_properties.values, [&](auto const& property) { return property == first_value; }))
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return first_value->to_string(mode);
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StringBuilder builder;
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for (size_t i = 0; i < m_properties.values.size(); ++i) {
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builder.append(m_properties.values[i]->to_string(mode));
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if (i != m_properties.values.size() - 1)
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builder.append(separator);
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}
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return MUST(builder.to_string());
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}
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void StyleValueList::set_style_sheet(GC::Ptr<CSSStyleSheet> style_sheet)
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{
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Base::set_style_sheet(style_sheet);
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for (auto& value : m_properties.values)
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const_cast<StyleValue&>(*value).set_style_sheet(style_sheet);
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}
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Vector<Parser::ComponentValue> StyleValueList::tokenize() const
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{
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Vector<Parser::ComponentValue> component_values;
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bool first = true;
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for (auto const& value : m_properties.values) {
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if (first) {
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first = false;
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} else {
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if (m_properties.separator == Separator::Comma)
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component_values.empend(Parser::Token::create(Parser::Token::Type::Comma));
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component_values.empend(Parser::Token::create_whitespace(" "_string));
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}
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component_values.extend(value->tokenize());
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}
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return component_values;
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#reify-a-transform-list
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static GC::Ref<CSSStyleValue> reify_a_transform_list(JS::Realm& realm, StyleValueVector const& values)
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{
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GC::RootVector<GC::Ref<CSSTransformComponent>> transform_components { realm.heap() };
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for (auto const& transform : values) {
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transform_components.append(transform->as_transformation().reify_a_transform_function(realm));
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}
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return CSSTransformValue::create(realm, static_cast<Vector<GC::Ref<CSSTransformComponent>>>(move(transform_components)));
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}
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GC::Ref<CSSStyleValue> StyleValueList::reify(JS::Realm& realm, FlyString const& associated_property) const
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{
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// NB: <transform-list> is a StyleValueList that contains TransformStyleValues. If that's what we are, follow the
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// steps for reifying that.
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if (all_of(m_properties.values, [](auto const& it) { return it->is_transformation(); })) {
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return reify_a_transform_list(realm, m_properties.values);
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}
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// NB: Otherwise, there isn't an equivalent CSSStyleValue for StyleValueList, so just use the default.
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return Base::reify(realm, associated_property);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#subdivide-into-iterations
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StyleValueVector StyleValueList::subdivide_into_iterations(PropertyNameAndID const& property) const
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{
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// To subdivide into iterations a CSS value whole value for a property property, execute the following steps:
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// 1. If property is a single-valued property, return a list containing whole value.
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if (property.is_custom_property() || !property_is_list_valued(property.id()))
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return StyleValueVector { *this };
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// 2. Otherwise, divide whole value into individual iterations, as appropriate for property, and return a list
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// containing the iterations in order.
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return values();
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}
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}
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