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+/*
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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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+
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+#include <LibWeb/CSS/Parser/Parser.h>
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+#include <LibWeb/CSS/Supports.h>
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+
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+namespace Web::CSS {
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+
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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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+
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+Supports::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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+ size_t true_results = 0;
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+ for (auto& child : children) {
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+ auto child_match = child.evaluate();
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+ if (child_match == MatchResult::False)
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+ return MatchResult::False;
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+ if (child_match == MatchResult::True)
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+ true_results++;
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+ }
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+ if (true_results == children.size())
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+ return MatchResult::True;
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+ return MatchResult::Unknown;
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+ }
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+ case Type::Or: {
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+ size_t false_results = 0;
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+ for (auto& child : children) {
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+ auto child_match = child.evaluate();
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+ if (child_match == MatchResult::True)
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+ return MatchResult::True;
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+ if (child_match == MatchResult::False)
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+ false_results++;
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+ }
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+ if (false_results == children.size())
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+ return MatchResult::False;
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+ return MatchResult::Unknown;
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+ }
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+ }
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+ VERIFY_NOT_REACHED();
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+}
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+
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+Supports::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&) {
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+ return MatchResult::Unknown;
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+ });
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+}
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+
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+Supports::MatchResult Supports::Feature::evaluate() const
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+{
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+ auto style_property = Parser({}, "").convert_to_style_property(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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+}
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