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LibWeb: Parse css math constants

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This commit is contained in:
stelar7 2023-05-26 21:24:31 +02:00 • committed by Sam Atkins
parent f8527e1cad
commit ba7af82c5c
3 changed files with 124 additions and 0 deletions
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27
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
View file

@ -8209,6 +8209,33 @@ ErrorOr<OwnPtr<CalculationNode>> Parser::parse_a_calculation(Vector<ComponentVal
}
}
if (value.is(Token::Type::Ident)) {
if (value.token().ident().equals_ignoring_ascii_case("e"sv)) {
TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::E)) }));
continue;
}
if (value.token().ident().equals_ignoring_ascii_case("pi"sv)) {
TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::PI)) }));
continue;
}
if (value.token().ident().equals_ignoring_ascii_case("infinity"sv)) {
TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::Infinity)) }));
continue;
}
if (value.token().ident().equals_ignoring_ascii_case("-infinity"sv)) {
TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::MinusInfinity)) }));
continue;
}
if (value.token().ident().equals_ignoring_ascii_case("NaN"sv)) {
TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::NaN)) }));
continue;
}
}
if (value.is(Token::Type::Number)) {
TRY(values.try_append({ TRY(NumericCalculationNode::create(value.token().number())) }));
continue;

65
Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.cpp
View file

@ -777,6 +777,71 @@ ErrorOr<void> SignCalculationNode::dump(StringBuilder& builder, int indent) cons
return {};
}
ErrorOr<NonnullOwnPtr<ConstantCalculationNode>> ConstantCalculationNode::create(ConstantType constant)
{
return adopt_nonnull_own_or_enomem(new (nothrow) ConstantCalculationNode(constant));
}
ConstantCalculationNode::ConstantCalculationNode(ConstantType constant)
: CalculationNode(Type::Constant)
, m_constant(constant)
{
}
ConstantCalculationNode::~ConstantCalculationNode() = default;
ErrorOr<String> ConstantCalculationNode::to_string() const
{
switch (m_constant) {
case CalculationNode::ConstantType::E:
return "e"_short_string;
case CalculationNode::ConstantType::PI:
return "pi"_short_string;
case CalculationNode::ConstantType::Infinity:
return "infinity"_string;
case CalculationNode::ConstantType::MinusInfinity:
return "-infinity"_string;
case CalculationNode::ConstantType::NaN:
return "NaN"_string;
}
VERIFY_NOT_REACHED();
}
Optional<CalculatedStyleValue::ResolvedType> ConstantCalculationNode::resolved_type() const
{
return CalculatedStyleValue::ResolvedType::Number;
}
CalculatedStyleValue::CalculationResult ConstantCalculationNode::resolve([[maybe_unused]] Optional<Length::ResolutionContext const&> context, [[maybe_unused]] CalculatedStyleValue::PercentageBasis const& percentage_basis) const
{
switch (m_constant) {
case CalculationNode::ConstantType::E:
return { Number(Number::Type::Number, M_E) };
case CalculationNode::ConstantType::PI:
return { Number(Number::Type::Number, M_PI) };
// FIXME: We need to keep track of Infinity and NaN across all nodes, since they require special handling.
case CalculationNode::ConstantType::Infinity:
return { Number(Number::Type::Number, NumericLimits<float>::max()) };
case CalculationNode::ConstantType::MinusInfinity:
return { Number(Number::Type::Number, NumericLimits<float>::lowest()) };
case CalculationNode::ConstantType::NaN:
return { Number(Number::Type::Number, NAN) };
}
VERIFY_NOT_REACHED();
}
ErrorOr<void> ConstantCalculationNode::for_each_child_node([[maybe_unused]] Function<ErrorOr<void>(NonnullOwnPtr<CalculationNode>&)> const& callback)
{
return {};
}
ErrorOr<void> ConstantCalculationNode::dump(StringBuilder& builder, int indent) const
{
TRY(builder.try_appendff("{: >{}}CONSTANT: {}\n", "", indent, TRY(to_string())));
return {};
}
void CalculatedStyleValue::CalculationResult::add(CalculationResult const& other, Optional<Length::ResolutionContext const&> context, PercentageBasis const& percentage_basis)
{
add_or_subtract_internal(SumOperation::Add, other, context, percentage_basis);

32
Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
View file

@ -115,6 +115,16 @@ private:
// https://www.w3.org/TR/css-values-4/#calculation-tree
class CalculationNode {
public:
// https://drafts.csswg.org/css-values-4/#calc-constants
// https://drafts.csswg.org/css-values-4/#calc-error-constants
enum class ConstantType {
E,
PI,
NaN,
Infinity,
MinusInfinity,
};
enum class Type {
Numeric,
// NOTE: Currently, any value with a `var()` or `attr()` function in it is always an
@ -138,6 +148,10 @@ public:
Abs,
Sign,
// Constant Nodes
// https://drafts.csswg.org/css-values-4/#calc-constants
Constant,
// This only exists during parsing.
Unparsed,
};
@ -354,4 +368,22 @@ private:
NonnullOwnPtr<CalculationNode> m_value;
};
class ConstantCalculationNode final : public CalculationNode {
public:
static ErrorOr<NonnullOwnPtr<ConstantCalculationNode>> create(CalculationNode::ConstantType);
~ConstantCalculationNode();
virtual ErrorOr<String> to_string() const override;
virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
virtual bool contains_percentage() const override { return false; };
virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&> context, CalculatedStyleValue::PercentageBasis const&) const override;
virtual ErrorOr<void> for_each_child_node(Function<ErrorOr<void>(NonnullOwnPtr<CalculationNode>&)> const&) override;
virtual ErrorOr<void> dump(StringBuilder&, int indent) const override;
private:
ConstantCalculationNode(ConstantType);
CalculationNode::ConstantType m_constant;
};
}