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LibPDF: Replace Value class by AK::Variant

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This decreases the memory consumption by LibPDF by 4 bytes per Value,
compensating exactly for the increase in an earlier commit. :^)
This commit is contained in:
Ben Wiederhake 2021-09-19 20:56:05 +02:00 • committed by Ali Mohammad Pur
parent d344253b08
commit f84a7e2e22
7 changed files with 132 additions and 243 deletions
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154
Userland/Libraries/LibPDF/Value.h
View file

@ -9,171 +9,79 @@
#include <AK/Format.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <AK/Variant.h>
#include <LibPDF/Forward.h>
#include <LibPDF/Object.h>
#include <LibPDF/Reference.h>
namespace PDF {
class Value {
class Value : public Variant<Empty, std::nullptr_t, bool, int, float, Reference, NonnullRefPtr<Object>> {
public:
using Variant::Variant;
Value()
: m_type(Type::Empty)
: Variant(Empty())
{
}
struct NullTag {
};
Value(NullTag)
: 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(Reference ref)
: m_type(Type::Ref)
{
m_as_ref = ref;
}
template<IsObject T>
Value(RefPtr<T> obj)
: m_type(obj ? Type::Object : Type::Empty)
Value(RefPtr<T> const& refptr)
: Variant(nullptr)
{
if (obj) {
m_as_object = obj;
}
if (refptr)
set<NonnullRefPtr<Object>>(*refptr);
}
template<IsObject T>
Value(NonnullRefPtr<T> obj)
: m_type(Type::Object)
[[nodiscard]] String to_string(int indent = 0) const;
[[nodiscard]] ALWAYS_INLINE bool has_number() const { return has<int>() || has<float>(); }
[[nodiscard]] ALWAYS_INLINE bool has_u32() const
{
m_as_object = obj;
return has<int>() && get<int>() >= 0;
}
Value(Value const& other)
[[nodiscard]] ALWAYS_INLINE bool has_u16() const
{
*this = other;
return has<int>() && get<int>() >= 0 && get<int>() < 65536;
}
~Value() = default;
Value& operator=(Value const& other);
[[nodiscard]] ALWAYS_INLINE bool is_empty() const { return m_type == Type::Empty; }
[[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
[[nodiscard]] ALWAYS_INLINE u32 get_u32() const
{
VERIFY(is_bool());
return m_as_bool;
VERIFY(has_u32());
return get<int>();
}
[[nodiscard]] ALWAYS_INLINE int as_int() const
[[nodiscard]] ALWAYS_INLINE u16 get_u16() const
{
VERIFY(is_int());
return m_as_int;
}
template<typename T>
[[nodiscard]] ALWAYS_INLINE bool is_int_type() const
{
if (!is_int())
return false;
auto as_int = static_cast<T>(m_as_int);
return as_int >= NumericLimits<T>::min() && as_int <= NumericLimits<T>::max();
}
template<typename T>
[[nodiscard]] ALWAYS_INLINE T as_int_type() const
{
VERIFY(is_int_type<T>());
return static_cast<T>(m_as_int);
VERIFY(has_u16());
return get<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;
if (has<int>())
return get<int>();
return static_cast<int>(get<float>());
}
[[nodiscard]] ALWAYS_INLINE float to_float() const
{
if (is_float())
return as_float();
return static_cast<float>(as_int());
if (has<float>())
return get<float>();
return static_cast<float>(get<int>());
}
[[nodiscard]] ALWAYS_INLINE u32 as_ref_index() const
{
VERIFY(is_ref());
return m_as_ref.as_ref_index();
return get<Reference>().as_ref_index();
}
[[nodiscard]] ALWAYS_INLINE u32 as_ref_generation_index() const
{
VERIFY(is_ref());
return m_as_ref.as_ref_generation_index();
return get<Reference>().as_ref_generation_index();
}
[[nodiscard]] ALWAYS_INLINE NonnullRefPtr<Object> as_object() const { return *m_as_object; }
[[nodiscard]] ALWAYS_INLINE explicit operator bool() const { return !is_empty(); }
[[nodiscard]] String to_string(int indent = 0) const;
private:
enum class Type {
Empty,
Null,
Bool,
Int,
Float,
Ref,
Object,
};
union {
bool m_as_bool;
int m_as_int;
Reference m_as_ref;
float m_as_float;
};
RefPtr<Object> m_as_object;
Type m_type;
};
}