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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <AK/Optional.h>
#include <AK/StringBuilder.h>
#ifndef KERNEL
# include <AK/String.h>
#endif
namespace AK {
class JsonValue {
public:
enum class Type {
Null,
Int32,
UnsignedInt32,
Int64,
UnsignedInt64,
#if !defined(KERNEL)
Double,
#endif
Bool,
String,
Array,
Object,
};
static ErrorOr<JsonValue> from_string(StringView);
explicit JsonValue(Type = Type::Null);
~JsonValue() { clear(); }
JsonValue(JsonValue const&);
JsonValue(JsonValue&&);
JsonValue& operator=(JsonValue const&);
JsonValue& operator=(JsonValue&&);
JsonValue(int);
JsonValue(unsigned);
JsonValue(long);
JsonValue(long unsigned);
JsonValue(long long);
JsonValue(long long unsigned);
#if !defined(KERNEL)
JsonValue(double);
#endif
JsonValue(bool);
JsonValue(char const*);
#ifndef KERNEL
JsonValue(String const&);
#endif
JsonValue(StringView);
JsonValue(JsonArray const&);
JsonValue(JsonObject const&);
JsonValue(JsonArray&&);
JsonValue(JsonObject&&);
// FIXME: Implement these
JsonValue& operator=(JsonArray&&) = delete;
JsonValue& operator=(JsonObject&&) = delete;
template<typename Builder>
typename Builder::OutputType serialized() const;
template<typename Builder>
void serialize(Builder&) const;
#ifndef KERNEL
String as_string_or(String const& alternative) const
{
if (is_string())
return as_string();
return alternative;
}
String to_string() const
{
if (is_string())
return as_string();
return serialized<StringBuilder>();
}
#endif
int to_int(int default_value = 0) const
{
return to_i32(default_value);
}
i32 to_i32(i32 default_value = 0) const { return to_number<i32>(default_value); }
i64 to_i64(i64 default_value = 0) const { return to_number<i64>(default_value); }
unsigned to_uint(unsigned default_value = 0) const { return to_u32(default_value); }
u32 to_u32(u32 default_value = 0) const { return to_number<u32>(default_value); }
u64 to_u64(u64 default_value = 0) const { return to_number<u64>(default_value); }
#if !defined(KERNEL)
float to_float(float default_value = 0) const
{
return to_number<float>(default_value);
}
double to_double(double default_value = 0) const { return to_number<double>(default_value); }
#endif
FlatPtr to_addr(FlatPtr default_value = 0) const
{
#ifdef __LP64__
return to_u64(default_value);
#else
return to_u32(default_value);
#endif
}
bool to_bool(bool default_value = false) const
{
if (!is_bool())
return default_value;
return as_bool();
}
i32 as_i32() const
{
VERIFY(is_i32());
return m_value.as_i32;
}
u32 as_u32() const
{
VERIFY(is_u32());
return m_value.as_u32;
}
i64 as_i64() const
{
VERIFY(is_i64());
return m_value.as_i64;
}
u64 as_u64() const
{
VERIFY(is_u64());
return m_value.as_u64;
}
bool as_bool() const
{
VERIFY(is_bool());
return m_value.as_bool;
}
#ifndef KERNEL
String as_string() const
{
VERIFY(is_string());
return *m_value.as_string;
}
#endif
JsonObject const& as_object() const
{
VERIFY(is_object());
return *m_value.as_object;
}
JsonArray const& as_array() const
{
VERIFY(is_array());
return *m_value.as_array;
}
#if !defined(KERNEL)
double as_double() const
{
VERIFY(is_double());
return m_value.as_double;
}
#endif
Type type() const
{
return m_type;
}
bool is_null() const { return m_type == Type::Null; }
bool is_bool() const { return m_type == Type::Bool; }
bool is_string() const { return m_type == Type::String; }
bool is_i32() const { return m_type == Type::Int32; }
bool is_u32() const { return m_type == Type::UnsignedInt32; }
bool is_i64() const { return m_type == Type::Int64; }
bool is_u64() const { return m_type == Type::UnsignedInt64; }
#if !defined(KERNEL)
bool is_double() const
{
return m_type == Type::Double;
}
#endif
bool is_array() const
{
return m_type == Type::Array;
}
bool is_object() const { return m_type == Type::Object; }
bool is_number() const
{
switch (m_type) {
case Type::Int32:
case Type::UnsignedInt32:
case Type::Int64:
case Type::UnsignedInt64:
#if !defined(KERNEL)
case Type::Double:
#endif
return true;
default:
return false;
}
}
template<typename T>
T to_number(T default_value = 0) const
{
#if !defined(KERNEL)
if (is_double())
return (T)as_double();
#endif
if (type() == Type::Int32)
return (T)as_i32();
if (type() == Type::UnsignedInt32)
return (T)as_u32();
if (type() == Type::Int64)
return (T)as_i64();
if (type() == Type::UnsignedInt64)
return (T)as_u64();
return default_value;
}
bool equals(JsonValue const& other) const;
private:
void clear();
void copy_from(JsonValue const&);
Type m_type { Type::Null };
union {
#ifndef KERNEL
StringImpl* as_string { nullptr };
#endif
JsonArray* as_array;
JsonObject* as_object;
#if !defined(KERNEL)
double as_double;
#endif
i32 as_i32;
u32 as_u32;
i64 as_i64;
u64 as_u64;
bool as_bool;
} m_value;
};
#ifndef KERNEL
template<>
struct Formatter<JsonValue> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& builder, JsonValue const& value)
{
return Formatter<StringView>::format(builder, value.to_string());
}
};
#endif
}
using AK::JsonValue;
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