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/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/Supports.h>
namespace Web::CSS {
Supports::Supports(NonnullOwnPtr<Condition>&& condition)
: m_condition(move(condition))
{
auto result = m_condition->evaluate();
if (result == MatchResult::Unknown) {
dbgln("!!! Evaluation of CSS Supports returned 'Unknown'!");
}
m_matches = result == MatchResult::True;
}
Supports::MatchResult Supports::Condition::evaluate() const
{
switch (type) {
case Type::Not:
return negate(children.first().evaluate());
case Type::And: {
size_t true_results = 0;
for (auto& child : children) {
auto child_match = child.evaluate();
if (child_match == MatchResult::False)
return MatchResult::False;
if (child_match == MatchResult::True)
true_results++;
}
if (true_results == children.size())
return MatchResult::True;
return MatchResult::Unknown;
}
case Type::Or: {
size_t false_results = 0;
for (auto& child : children) {
auto child_match = child.evaluate();
if (child_match == MatchResult::True)
return MatchResult::True;
if (child_match == MatchResult::False)
false_results++;
}
if (false_results == children.size())
return MatchResult::False;
return MatchResult::Unknown;
}
}
VERIFY_NOT_REACHED();
}
Supports::MatchResult Supports::InParens::evaluate() const
{
return value.visit(
[&](NonnullOwnPtr<Condition>& condition) {
return condition->evaluate();
},
[&](Feature& feature) {
return feature.evaluate();
},
[&](GeneralEnclosed&) {
return MatchResult::Unknown;
});
}
Supports::MatchResult Supports::Feature::evaluate() const
{
auto style_property = Parser({}, "").convert_to_style_property(declaration);
if (style_property.has_value())
return MatchResult::True;
return MatchResult::False;
}
}
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