7880718fa8
This is defined in https://www.w3.org/TR/css-conditional-4/#at-supports-ext which just became a CR. :^)
76 lines
1.7 KiB
C++
76 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.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/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/Supports.h>
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namespace Web::CSS {
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Supports::Supports(NonnullOwnPtr<Condition>&& condition)
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: m_condition(move(condition))
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{
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m_matches = m_condition->evaluate();
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}
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bool Supports::Condition::evaluate() const
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{
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switch (type) {
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case Type::Not:
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return !children.first().evaluate();
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case Type::And:
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for (auto& child : children) {
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if (!child.evaluate())
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return false;
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}
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return true;
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case Type::Or:
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for (auto& child : children) {
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if (child.evaluate())
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return true;
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}
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return false;
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}
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VERIFY_NOT_REACHED();
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}
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bool Supports::InParens::evaluate() const
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{
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return value.visit(
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[&](NonnullOwnPtr<Condition> const& condition) {
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return condition->evaluate();
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},
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[&](Feature const& feature) {
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return feature.evaluate();
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},
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[&](GeneralEnclosed const&) {
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return false;
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});
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}
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bool Supports::Declaration::evaluate() const
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{
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auto style_property = Parser({}, declaration).parse_as_declaration();
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return style_property.has_value();
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}
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bool Supports::Selector::evaluate() const
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{
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auto style_property = Parser({}, selector).parse_as_selector();
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return style_property.has_value();
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}
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bool Supports::Feature::evaluate() const
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{
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return value.visit(
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[&](Declaration const& declaration) {
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return declaration.evaluate();
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},
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[&](Selector const& selector) {
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return selector.evaluate();
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});
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}
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}
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