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/*
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <AK/Types.h>
#include <math.h>
namespace Web::CSS {
class Number {
public:
enum class Type {
Number,
IntegerWithExplicitSign, // This only exists for the nightmarish An+B parsing algorithm
Integer
};
Number()
: m_value(0)
, m_type(Type::Number)
{
}
Number(Type type, float value)
: m_value(value)
, m_type(type)
{
}
float value() const { return m_value; }
i64 integer_value() const
{
// https://www.w3.org/TR/css-values-4/#numeric-types
// When a value cannot be explicitly supported due to range/precision limitations, it must be converted
// to the closest value supported by the implementation, but how the implementation defines "closest"
// is explicitly undefined as well.
return llroundf(m_value);
}
bool is_integer() const { return m_type == Type::Integer || m_type == Type::IntegerWithExplicitSign; }
bool is_integer_with_explicit_sign() const { return m_type == Type::IntegerWithExplicitSign; }
Number operator+(Number const& other) const
{
if (is_integer() && other.is_integer())
return { Type::Integer, m_value + other.m_value };
return { Type::Number, m_value + other.m_value };
}
Number operator-(Number const& other) const
{
if (is_integer() && other.is_integer())
return { Type::Integer, m_value - other.m_value };
return { Type::Number, m_value - other.m_value };
}
Number operator*(Number const& other) const
{
if (is_integer() && other.is_integer())
return { Type::Integer, m_value * other.m_value };
return { Type::Number, m_value * other.m_value };
}
Number operator/(Number const& other) const
{
return { Type::Number, m_value / other.m_value };
}
ErrorOr<String> to_string() const
{
if (m_type == Type::IntegerWithExplicitSign)
return String::formatted("{:+}", m_value);
return String::number(m_value);
}
bool operator==(Number const& other) const
{
return m_type == other.m_type && m_value == other.m_value;
}
private:
float m_value { 0 };
Type m_type;
};
}
template<>
struct AK::Formatter<Web::CSS::Number> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, Web::CSS::Number const& number)
{
return Formatter<StringView>::format(builder, TRY(number.to_string()));
}
};
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