dea4f83037
Now that we can serialize CSS tokens, we can just hold a string and then re-parse it when the Supports is evaluated. This feels a little weird, but it only happens once so it's not going to slow it down much, and it keep the API cleaner.
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, 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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auto result = m_condition->evaluate();
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if (result == MatchResult::Unknown) {
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dbgln("!!! Evaluation of CSS Supports returned 'Unknown'!");
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}
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m_matches = result == MatchResult::True;
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}
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MatchResult 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 negate(children.first().evaluate());
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case Type::And:
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return evaluate_and(children, [](auto& child) { return child.evaluate(); });
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case Type::Or:
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return evaluate_or(children, [](auto& child) { return child.evaluate(); });
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}
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VERIFY_NOT_REACHED();
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}
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MatchResult Supports::InParens::evaluate() const
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{
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return value.visit(
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[&](NonnullOwnPtr<Condition>& condition) {
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return condition->evaluate();
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},
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[&](Feature& feature) {
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return feature.evaluate();
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},
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[&](GeneralEnclosed& general_enclosed) {
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return general_enclosed.evaluate();
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});
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}
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MatchResult Supports::Feature::evaluate() const
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{
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auto style_property = Parser({}, declaration).parse_as_declaration();
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if (style_property.has_value())
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return MatchResult::True;
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return MatchResult::False;
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}
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}
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