ladybird/Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
 * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
 * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/Function.h>
#include <LibWeb/CSS/Angle.h>
#include <LibWeb/CSS/CSSNumericType.h>
#include <LibWeb/CSS/Frequency.h>
#include <LibWeb/CSS/Length.h>
#include <LibWeb/CSS/Percentage.h>
#include <LibWeb/CSS/StyleValue.h>
#include <LibWeb/CSS/Time.h>

namespace Web::CSS {

class CalculationNode;

class CalculatedStyleValue : public StyleValue {
public:
    enum class ResolvedType {
        Angle,
        Frequency,
        Integer,
        Length,
        Number,
        Percentage,
        Time,
    };

    enum class SumOperation {
        Add,
        Subtract,
    };
    enum class ProductOperation {
        Multiply,
        Divide,
    };

    using PercentageBasis = Variant<Empty, Angle, Frequency, Length, Time>;

    class CalculationResult {
    public:
        using Value = Variant<Number, Angle, Frequency, Length, Percentage, Time>;
        CalculationResult(Value value)
            : m_value(move(value))
        {
        }
        void add(CalculationResult const& other, Optional<Length::ResolutionContext const&>, PercentageBasis const& percentage_basis);
        void subtract(CalculationResult const& other, Optional<Length::ResolutionContext const&>, PercentageBasis const& percentage_basis);
        void multiply_by(CalculationResult const& other, Optional<Length::ResolutionContext const&>);
        void divide_by(CalculationResult const& other, Optional<Length::ResolutionContext const&>);
        void negate();
        void invert();

        Value const& value() const { return m_value; }

    private:
        void add_or_subtract_internal(SumOperation op, CalculationResult const& other, Optional<Length::ResolutionContext const&>, PercentageBasis const& percentage_basis);
        Value m_value;
    };

    static ErrorOr<ValueComparingNonnullRefPtr<CalculatedStyleValue>> create(NonnullOwnPtr<CalculationNode> calculation, CSSNumericType resolved_type)
    {
        return adopt_nonnull_ref_or_enomem(new (nothrow) CalculatedStyleValue(move(calculation), resolved_type));
    }

    ErrorOr<String> to_string() const override;
    virtual bool equals(StyleValue const& other) const override;

    bool resolves_to_angle() const { return m_resolved_type.matches_angle(); }
    bool resolves_to_angle_percentage() const { return m_resolved_type.matches_angle_percentage(); }
    Optional<Angle> resolve_angle() const;
    Optional<Angle> resolve_angle_percentage(Angle const& percentage_basis) const;

    bool resolves_to_frequency() const { return m_resolved_type.matches_frequency(); }
    bool resolves_to_frequency_percentage() const { return m_resolved_type.matches_frequency_percentage(); }
    Optional<Frequency> resolve_frequency() const;
    Optional<Frequency> resolve_frequency_percentage(Frequency const& percentage_basis) const;

    bool resolves_to_length() const { return m_resolved_type.matches_length(); }
    bool resolves_to_length_percentage() const { return m_resolved_type.matches_length_percentage(); }
    [[nodiscard]] Optional<Length> resolve_length(Length::ResolutionContext const&) const;
    Optional<Length> resolve_length(Layout::Node const& layout_node) const;
    Optional<Length> resolve_length_percentage(Layout::Node const&, Length const& percentage_basis) const;

    bool resolves_to_percentage() const { return m_resolved_type.matches_percentage(); }
    Optional<Percentage> resolve_percentage() const;

    bool resolves_to_time() const { return m_resolved_type.matches_time(); }
    bool resolves_to_time_percentage() const { return m_resolved_type.matches_time_percentage(); }
    Optional<Time> resolve_time() const;
    Optional<Time> resolve_time_percentage(Time const& percentage_basis) const;

    bool resolves_to_number() const { return m_resolved_type.matches_number(); }
    bool resolves_to_number_percentage() const { return m_resolved_type.matches_number_percentage(); }
    Optional<double> resolve_number() const;
    Optional<i64> resolve_integer();

    bool contains_percentage() const;

private:
    explicit CalculatedStyleValue(NonnullOwnPtr<CalculationNode> calculation, CSSNumericType resolved_type)
        : StyleValue(Type::Calculated)
        , m_resolved_type(resolved_type)
        , m_calculation(move(calculation))
    {
    }

    CSSNumericType m_resolved_type;
    NonnullOwnPtr<CalculationNode> m_calculation;
};

// 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,
    };
    static Optional<ConstantType> constant_type_from_string(StringView);

    enum class Type {
        Numeric,
        // NOTE: Currently, any value with a `var()` or `attr()` function in it is always an
        //       UnresolvedStyleValue so we do not have to implement a NonMathFunction type here.

        // Comparison function nodes, a sub-type of operator node
        // https://drafts.csswg.org/css-values-4/#comp-func
        Min,
        Max,
        Clamp,

        // Calc-operator nodes, a sub-type of operator node
        // https://www.w3.org/TR/css-values-4/#calculation-tree-calc-operator-nodes
        Sum,
        Product,
        Negate,
        Invert,

        // Sign-Related Functions, a sub-type of operator node
        // https://drafts.csswg.org/css-values-4/#sign-funcs
        Abs,
        Sign,

        // Constant Nodes
        // https://drafts.csswg.org/css-values-4/#calc-constants
        Constant,

        // Trigonometric functions, a sub-type of operator node
        // https://drafts.csswg.org/css-values-4/#trig-funcs
        Sin,
        Cos,
        Tan,
        Asin,
        Acos,
        Atan,
        Atan2,

        // Exponential functions, a sub-type of operator node
        // https://drafts.csswg.org/css-values-4/#exponent-funcs
        Pow,
        Sqrt,
        Hypot,
        Log,
        Exp,

        // Stepped value functions, a sub-type of operator node
        // https://drafts.csswg.org/css-values-4/#round-func
        Round,
        Mod,
        Rem,

        // This only exists during parsing.
        Unparsed,
    };
    using NumericValue = CalculatedStyleValue::CalculationResult::Value;

    virtual ~CalculationNode();

    Type type() const { return m_type; }

    // https://www.w3.org/TR/css-values-4/#calculation-tree-operator-nodes
    bool is_operator_node() const
    {
        return is_calc_operator_node() || is_math_function_node();
    }

    bool is_math_function_node() const
    {
        switch (m_type) {
        case Type::Min:
        case Type::Max:
        case Type::Clamp:
        case Type::Abs:
        case Type::Sign:
        case Type::Sin:
        case Type::Cos:
        case Type::Tan:
        case Type::Asin:
        case Type::Acos:
        case Type::Atan:
        case Type::Atan2:
        case Type::Pow:
        case Type::Sqrt:
        case Type::Hypot:
        case Type::Log:
        case Type::Exp:
        case Type::Round:
        case Type::Mod:
        case Type::Rem:
            return true;

        default:
            return false;
        }
    }

    // https://www.w3.org/TR/css-values-4/#calculation-tree-calc-operator-nodes
    bool is_calc_operator_node() const
    {
        return first_is_one_of(m_type, Type::Sum, Type::Product, Type::Negate, Type::Invert);
    }

    virtual ErrorOr<String> to_string() const = 0;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const = 0;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const = 0;
    virtual bool contains_percentage() const = 0;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, CalculatedStyleValue::PercentageBasis const&) const = 0;
    virtual ErrorOr<void> for_each_child_node(Function<ErrorOr<void>(NonnullOwnPtr<CalculationNode>&)> const&) { return {}; }

    virtual ErrorOr<void> dump(StringBuilder&, int indent) const = 0;

protected:
    explicit CalculationNode(Type);

private:
    Type m_type;
};

class NumericCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<NumericCalculationNode>> create(NumericValue);
    ~NumericCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, CalculatedStyleValue::PercentageBasis const&) const override;

    virtual ErrorOr<void> dump(StringBuilder&, int indent) const override;

private:
    explicit NumericCalculationNode(NumericValue);
    NumericValue m_value;
};

class SumCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<SumCalculationNode>> create(Vector<NonnullOwnPtr<CalculationNode>>);
    ~SumCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit SumCalculationNode(Vector<NonnullOwnPtr<CalculationNode>>);
    Vector<NonnullOwnPtr<CalculationNode>> m_values;
};

class ProductCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<ProductCalculationNode>> create(Vector<NonnullOwnPtr<CalculationNode>>);
    ~ProductCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit ProductCalculationNode(Vector<NonnullOwnPtr<CalculationNode>>);
    Vector<NonnullOwnPtr<CalculationNode>> m_values;
};

class NegateCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<NegateCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~NegateCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit NegateCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class InvertCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<InvertCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~InvertCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit InvertCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class MinCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<MinCalculationNode>> create(Vector<NonnullOwnPtr<CalculationNode>>);
    ~MinCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit MinCalculationNode(Vector<NonnullOwnPtr<CalculationNode>>);
    Vector<NonnullOwnPtr<CalculationNode>> m_values;
};

class MaxCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<MaxCalculationNode>> create(Vector<NonnullOwnPtr<CalculationNode>>);
    ~MaxCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit MaxCalculationNode(Vector<NonnullOwnPtr<CalculationNode>>);
    Vector<NonnullOwnPtr<CalculationNode>> m_values;
};

class ClampCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<ClampCalculationNode>> create(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~ClampCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit ClampCalculationNode(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_min_value;
    NonnullOwnPtr<CalculationNode> m_center_value;
    NonnullOwnPtr<CalculationNode> m_max_value;
};

class AbsCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<AbsCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~AbsCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    AbsCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class SignCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<SignCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~SignCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    SignCalculationNode(NonnullOwnPtr<CalculationNode>);
    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 Optional<CSSNumericType> determine_type(PropertyID) 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;
};

class SinCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<SinCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~SinCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    SinCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class CosCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<CosCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~CosCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    CosCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class TanCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<TanCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~TanCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    TanCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class AsinCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<AsinCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~AsinCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    AsinCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class AcosCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<AcosCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~AcosCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    AcosCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class AtanCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<AtanCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~AtanCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    AtanCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class Atan2CalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<Atan2CalculationNode>> create(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~Atan2CalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    Atan2CalculationNode(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_y;
    NonnullOwnPtr<CalculationNode> m_x;
};

class PowCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<PowCalculationNode>> create(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~PowCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override { return false; }
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit PowCalculationNode(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_x;
    NonnullOwnPtr<CalculationNode> m_y;
};

class SqrtCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<SqrtCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~SqrtCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override { return false; }
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    SqrtCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class HypotCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<HypotCalculationNode>> create(Vector<NonnullOwnPtr<CalculationNode>>);
    ~HypotCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    explicit HypotCalculationNode(Vector<NonnullOwnPtr<CalculationNode>>);
    Vector<NonnullOwnPtr<CalculationNode>> m_values;
};

class LogCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<LogCalculationNode>> create(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~LogCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override { return false; }
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    LogCalculationNode(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_x;
    NonnullOwnPtr<CalculationNode> m_y;
};

class ExpCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<ExpCalculationNode>> create(NonnullOwnPtr<CalculationNode>);
    ~ExpCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override { return false; }
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    ExpCalculationNode(NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_value;
};

class RoundCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<RoundCalculationNode>> create(RoundingStrategy, NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~RoundCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    RoundCalculationNode(RoundingStrategy, NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    RoundingStrategy m_strategy;
    NonnullOwnPtr<CalculationNode> m_x;
    NonnullOwnPtr<CalculationNode> m_y;
};

class ModCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<ModCalculationNode>> create(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~ModCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    ModCalculationNode(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_x;
    NonnullOwnPtr<CalculationNode> m_y;
};

class RemCalculationNode final : public CalculationNode {
public:
    static ErrorOr<NonnullOwnPtr<RemCalculationNode>> create(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    ~RemCalculationNode();

    virtual ErrorOr<String> to_string() const override;
    virtual Optional<CalculatedStyleValue::ResolvedType> resolved_type() const override;
    virtual Optional<CSSNumericType> determine_type(PropertyID) const override;
    virtual bool contains_percentage() const override;
    virtual CalculatedStyleValue::CalculationResult resolve(Optional<Length::ResolutionContext const&>, 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:
    RemCalculationNode(NonnullOwnPtr<CalculationNode>, NonnullOwnPtr<CalculationNode>);
    NonnullOwnPtr<CalculationNode> m_x;
    NonnullOwnPtr<CalculationNode> m_y;
};

}