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LibWeb: Parse css math constants
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3 changed files with 124 additions and 0 deletions
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@ -8209,6 +8209,33 @@ ErrorOr<OwnPtr<CalculationNode>> Parser::parse_a_calculation(Vector<ComponentVal
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}
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}
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if (value.is(Token::Type::Ident)) {
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if (value.token().ident().equals_ignoring_ascii_case("e"sv)) {
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TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::E)) }));
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continue;
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}
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if (value.token().ident().equals_ignoring_ascii_case("pi"sv)) {
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TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::PI)) }));
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continue;
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}
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if (value.token().ident().equals_ignoring_ascii_case("infinity"sv)) {
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TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::Infinity)) }));
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continue;
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}
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if (value.token().ident().equals_ignoring_ascii_case("-infinity"sv)) {
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TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::MinusInfinity)) }));
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continue;
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}
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if (value.token().ident().equals_ignoring_ascii_case("NaN"sv)) {
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TRY(values.try_append({ TRY(ConstantCalculationNode::create(CalculationNode::ConstantType::NaN)) }));
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continue;
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}
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}
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if (value.is(Token::Type::Number)) {
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TRY(values.try_append({ TRY(NumericCalculationNode::create(value.token().number())) }));
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continue;
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@ -777,6 +777,71 @@ ErrorOr<void> SignCalculationNode::dump(StringBuilder& builder, int indent) cons
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return {};
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}
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ErrorOr<NonnullOwnPtr<ConstantCalculationNode>> ConstantCalculationNode::create(ConstantType constant)
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{
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return adopt_nonnull_own_or_enomem(new (nothrow) ConstantCalculationNode(constant));
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}
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ConstantCalculationNode::ConstantCalculationNode(ConstantType constant)
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: CalculationNode(Type::Constant)
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, m_constant(constant)
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{
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}
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ConstantCalculationNode::~ConstantCalculationNode() = default;
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ErrorOr<String> ConstantCalculationNode::to_string() const
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{
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switch (m_constant) {
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case CalculationNode::ConstantType::E:
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return "e"_short_string;
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case CalculationNode::ConstantType::PI:
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return "pi"_short_string;
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case CalculationNode::ConstantType::Infinity:
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return "infinity"_string;
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case CalculationNode::ConstantType::MinusInfinity:
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return "-infinity"_string;
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case CalculationNode::ConstantType::NaN:
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return "NaN"_string;
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}
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VERIFY_NOT_REACHED();
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}
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Optional<CalculatedStyleValue::ResolvedType> ConstantCalculationNode::resolved_type() const
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{
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return CalculatedStyleValue::ResolvedType::Number;
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}
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CalculatedStyleValue::CalculationResult ConstantCalculationNode::resolve([[maybe_unused]] Optional<Length::ResolutionContext const&> context, [[maybe_unused]] CalculatedStyleValue::PercentageBasis const& percentage_basis) const
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{
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switch (m_constant) {
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case CalculationNode::ConstantType::E:
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return { Number(Number::Type::Number, M_E) };
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case CalculationNode::ConstantType::PI:
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return { Number(Number::Type::Number, M_PI) };
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// FIXME: We need to keep track of Infinity and NaN across all nodes, since they require special handling.
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case CalculationNode::ConstantType::Infinity:
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return { Number(Number::Type::Number, NumericLimits<float>::max()) };
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case CalculationNode::ConstantType::MinusInfinity:
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return { Number(Number::Type::Number, NumericLimits<float>::lowest()) };
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case CalculationNode::ConstantType::NaN:
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return { Number(Number::Type::Number, NAN) };
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}
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VERIFY_NOT_REACHED();
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}
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ErrorOr<void> ConstantCalculationNode::for_each_child_node([[maybe_unused]] Function<ErrorOr<void>(NonnullOwnPtr<CalculationNode>&)> const& callback)
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{
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return {};
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}
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ErrorOr<void> ConstantCalculationNode::dump(StringBuilder& builder, int indent) const
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{
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TRY(builder.try_appendff("{: >{}}CONSTANT: {}\n", "", indent, TRY(to_string())));
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return {};
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}
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void CalculatedStyleValue::CalculationResult::add(CalculationResult const& other, Optional<Length::ResolutionContext const&> context, PercentageBasis const& percentage_basis)
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{
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add_or_subtract_internal(SumOperation::Add, other, context, percentage_basis);
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@ -115,6 +115,16 @@ private:
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// https://www.w3.org/TR/css-values-4/#calculation-tree
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class CalculationNode {
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public:
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// https://drafts.csswg.org/css-values-4/#calc-constants
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// https://drafts.csswg.org/css-values-4/#calc-error-constants
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enum class ConstantType {
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E,
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PI,
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NaN,
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Infinity,
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MinusInfinity,
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};
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enum class Type {
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Numeric,
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// NOTE: Currently, any value with a `var()` or `attr()` function in it is always an
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@ -138,6 +148,10 @@ public:
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Abs,
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Sign,
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// Constant Nodes
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// https://drafts.csswg.org/css-values-4/#calc-constants
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Constant,
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// This only exists during parsing.
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Unparsed,
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};
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@ -354,4 +368,22 @@ private:
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NonnullOwnPtr<CalculationNode> m_value;
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};
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class ConstantCalculationNode final : public CalculationNode {
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public:
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static ErrorOr<NonnullOwnPtr<ConstantCalculationNode>> create(CalculationNode::ConstantType);
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~ConstantCalculationNode();
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virtual ErrorOr<String> to_string() const override;
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virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
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virtual bool contains_percentage() const override { return false; };
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virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&> context, CalculatedStyleValue::PercentageBasis const&) const override;
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virtual ErrorOr<void> for_each_child_node(Function<ErrorOr<void>(NonnullOwnPtr<CalculationNode>&)> const&) override;
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virtual ErrorOr<void> dump(StringBuilder&, int indent) const override;
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private:
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ConstantCalculationNode(ConstantType);
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CalculationNode::ConstantType m_constant;
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};
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}
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