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/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Checked.h>
#include <AK/DeprecatedString.h>
#include <AK/Format.h>
#include <AK/Optional.h>
#include <AK/StringView.h>
#include <AK/Variant.h>
#include <AK/Vector.h>
#include <LibIPC/Forward.h>
#include <LibSQL/Forward.h>
#include <LibSQL/Result.h>
#include <LibSQL/Type.h>
#include <math.h>
namespace SQL {
template<typename T>
concept Boolean = SameAs<RemoveCVReference<T>, bool>;
template<typename T>
concept Integer = (Integral<T> && !Boolean<T>);
/**
* A `Value` is an atomic piece of SQL data`. A `Value` has a basic type
* (Text/String, Integer, Float, etc). Richer types are implemented in higher
* level layers, but the resulting data is stored in these `Value` objects.
*/
class Value {
template<Integer T>
using IntegerType = Conditional<IsSigned<T>, i64, u64>;
public:
explicit Value(SQLType sql_type = SQLType::Null);
explicit Value(DeprecatedString);
explicit Value(double);
Value(Value const&);
Value(Value&&);
~Value();
explicit Value(Integer auto value)
: m_type(SQLType::Integer)
, m_value(static_cast<IntegerType<decltype(value)>>(value))
{
}
explicit Value(Boolean auto value)
: m_type(SQLType::Boolean)
, m_value(value)
{
}
explicit Value(UnixDateTime);
explicit Value(Duration);
static ResultOr<Value> create_tuple(NonnullRefPtr<TupleDescriptor>);
static ResultOr<Value> create_tuple(Vector<Value>);
[[nodiscard]] SQLType type() const;
[[nodiscard]] StringView type_name() const;
[[nodiscard]] bool is_type_compatible_with(SQLType) const;
[[nodiscard]] bool is_null() const;
[[nodiscard]] bool is_int() const;
[[nodiscard]] auto const& value() const
{
return *m_value;
}
[[nodiscard]] DeprecatedString to_deprecated_string() const;
[[nodiscard]] Optional<double> to_double() const;
[[nodiscard]] Optional<bool> to_bool() const;
[[nodiscard]] Optional<Vector<Value>> to_vector() const;
template<Integer T>
[[nodiscard]] Optional<T> to_int() const
{
if (is_null())
return {};
return m_value->visit(
[](DeprecatedString const& value) -> Optional<T> {
if constexpr (IsSigned<T>)
return value.to_int<T>();
else
return value.to_uint<T>();
},
[](Integer auto value) -> Optional<T> {
if (!AK::is_within_range<T>(value))
return {};
return static_cast<T>(value);
},
[](double value) -> Optional<T> {
if (!AK::is_within_range<T>(value))
return {};
return static_cast<T>(round(value));
},
[](bool value) -> Optional<T> { return static_cast<T>(value); },
[](TupleValue const&) -> Optional<T> { return {}; });
}
Value& operator=(Value);
Value& operator=(DeprecatedString);
Value& operator=(double);
Value& operator=(Integer auto value)
{
m_type = SQLType::Integer;
m_value = static_cast<IntegerType<decltype(value)>>(value);
return *this;
}
ResultOr<void> assign_tuple(NonnullRefPtr<TupleDescriptor>);
ResultOr<void> assign_tuple(Vector<Value>);
Value& operator=(Boolean auto value)
{
m_type = SQLType::Boolean;
m_value = value;
return *this;
}
[[nodiscard]] size_t length() const;
[[nodiscard]] u32 hash() const;
void serialize(Serializer&) const;
void deserialize(Serializer&);
[[nodiscard]] int compare(Value const&) const;
bool operator==(Value const&) const;
bool operator==(StringView) const;
bool operator==(double) const;
template<Integer T>
bool operator==(T value)
{
return to_int<T>() == value;
}
bool operator!=(Value const&) const;
bool operator<(Value const&) const;
bool operator<=(Value const&) const;
bool operator>(Value const&) const;
bool operator>=(Value const&) const;
ResultOr<Value> add(Value const&) const;
ResultOr<Value> subtract(Value const&) const;
ResultOr<Value> multiply(Value const&) const;
ResultOr<Value> divide(Value const&) const;
ResultOr<Value> modulo(Value const&) const;
ResultOr<Value> negate() const;
ResultOr<Value> shift_left(Value const&) const;
ResultOr<Value> shift_right(Value const&) const;
ResultOr<Value> bitwise_or(Value const&) const;
ResultOr<Value> bitwise_and(Value const&) const;
ResultOr<Value> bitwise_not() const;
[[nodiscard]] TupleElementDescriptor descriptor() const;
private:
friend Serializer;
struct TupleValue {
NonnullRefPtr<TupleDescriptor> descriptor;
Vector<Value> values;
};
using ValueType = Variant<DeprecatedString, i64, u64, double, bool, TupleValue>;
static ResultOr<NonnullRefPtr<TupleDescriptor>> infer_tuple_descriptor(Vector<Value> const& values);
Value(NonnullRefPtr<TupleDescriptor> descriptor, Vector<Value> values);
SQLType m_type { SQLType::Null };
Optional<ValueType> m_value;
};
}
template<>
struct AK::Formatter<SQL::Value> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, SQL::Value const& value)
{
return Formatter<StringView>::format(builder, value.to_deprecated_string());
}
};
namespace IPC {
template<>
ErrorOr<void> encode(Encoder&, SQL::Value const&);
template<>
ErrorOr<SQL::Value> decode(Decoder&);
}
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