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/*
* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Format.h>
namespace PDF {
class Object;
class Value {
public:
// We store refs as u32, with 18 bits for the index and 14 bits for the
// generation index. The generation index is stored in the higher bits.
// This may need to be rethought later, as the max generation index is
// 2^16 and the max for the object index is probably 2^32 (I don't know
// exactly)
static constexpr auto max_ref_index = (1 << 19) - 1; // 2 ^ 18 - 1
static constexpr auto max_ref_generation_index = (1 << 15) - 1; // 2 ^ 14 - 1
Value()
: m_type(Type::Null)
{
}
Value(bool b)
: m_type(Type::Bool)
{
m_as_bool = b;
}
Value(int i)
: m_type(Type::Int)
{
m_as_int = i;
}
Value(float f)
: m_type(Type::Float)
{
m_as_float = f;
}
Value(u32 index, u32 generation_index)
: m_type(Type::Ref)
{
VERIFY(index < max_ref_index);
VERIFY(generation_index < max_ref_generation_index);
m_as_ref = (generation_index << 14) | index;
}
template<IsObject T>
Value(NonnullRefPtr<T> obj)
: m_type(Type::Object)
{
obj->ref();
m_as_object = obj;
}
Value(const Value& other)
{
*this = other;
}
~Value();
Value& operator=(const Value& other);
[[nodiscard]] ALWAYS_INLINE bool is_null() const { return m_type == Type::Null; }
[[nodiscard]] ALWAYS_INLINE bool is_bool() const { return m_type == Type::Bool; }
[[nodiscard]] ALWAYS_INLINE bool is_int() const { return m_type == Type::Int; }
[[nodiscard]] ALWAYS_INLINE bool is_float() const { return m_type == Type::Float; }
[[nodiscard]] ALWAYS_INLINE bool is_number() const { return is_int() || is_float(); }
[[nodiscard]] ALWAYS_INLINE bool is_ref() const { return m_type == Type::Ref; }
[[nodiscard]] ALWAYS_INLINE bool is_object() const { return m_type == Type::Object; }
[[nodiscard]] ALWAYS_INLINE bool as_bool() const
{
VERIFY(is_bool());
return m_as_bool;
}
[[nodiscard]] ALWAYS_INLINE int as_int() const
{
VERIFY(is_int());
return m_as_int;
}
[[nodiscard]] ALWAYS_INLINE int to_int() const
{
if (is_int())
return as_int();
return static_cast<int>(as_float());
}
[[nodiscard]] ALWAYS_INLINE float as_float() const
{
VERIFY(is_float());
return m_as_float;
}
[[nodiscard]] ALWAYS_INLINE float to_float() const
{
if (is_float())
return as_float();
return static_cast<float>(as_int());
}
[[nodiscard]] ALWAYS_INLINE u32 as_ref_index() const
{
VERIFY(is_ref());
return m_as_ref & 0x3ffff;
}
[[nodiscard]] ALWAYS_INLINE u32 as_ref_generation_index() const
{
VERIFY(is_ref());
return m_as_ref >> 18;
}
[[nodiscard]] ALWAYS_INLINE NonnullRefPtr<Object> as_object() const { return *m_as_object; }
[[nodiscard]] ALWAYS_INLINE explicit operator bool() const { return !is_null(); }
[[nodiscard]] String to_string(int indent = 0) const;
private:
enum class Type {
Null,
Bool,
Int,
Float,
Ref,
Object,
};
union {
bool m_as_bool;
int m_as_int;
u32 m_as_ref;
float m_as_float;
Object* m_as_object;
};
Type m_type;
};
}
namespace AK {
template<>
struct Formatter<PDF::Value> : Formatter<StringView> {
void format(FormatBuilder& builder, const PDF::Value& value)
{
Formatter<StringView>::format(builder, value.to_string());
}
};
}
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