mirror of
https://github.com/SerenityOS/serenity
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c0ffff7e88
JsonValue can store JsonObject which uses DS for keys, so it is not safe to use it in the kernel even with the double/String guards.
302 lines
7.2 KiB
C++
302 lines
7.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#ifdef KERNEL
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# error "JsonValue does not propagate allocation failures, so it is not safe to use in the kernel."
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#endif
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#include <AK/DeprecatedString.h>
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#include <AK/Forward.h>
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#include <AK/Optional.h>
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#include <AK/StringBuilder.h>
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namespace AK {
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class JsonValue {
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public:
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enum class Type {
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Null,
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Int32,
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UnsignedInt32,
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Int64,
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UnsignedInt64,
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Double,
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Bool,
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String,
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Array,
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Object,
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};
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static ErrorOr<JsonValue> from_string(StringView);
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JsonValue() = default;
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~JsonValue() { clear(); }
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JsonValue(JsonValue const&);
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JsonValue(JsonValue&&);
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JsonValue& operator=(JsonValue const&);
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JsonValue& operator=(JsonValue&&);
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JsonValue(int);
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JsonValue(unsigned);
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JsonValue(long);
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JsonValue(long unsigned);
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JsonValue(long long);
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JsonValue(long long unsigned);
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JsonValue(double);
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JsonValue(char const*);
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JsonValue(DeprecatedString const&);
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JsonValue(StringView);
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template<typename T>
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requires(SameAs<RemoveCVReference<T>, bool>)
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JsonValue(T value)
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: m_type(Type::Bool)
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, m_value { .as_bool = value }
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{
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}
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JsonValue(JsonArray const&);
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JsonValue(JsonObject const&);
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JsonValue(JsonArray&&);
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JsonValue(JsonObject&&);
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// FIXME: Implement these
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JsonValue& operator=(JsonArray&&) = delete;
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JsonValue& operator=(JsonObject&&) = delete;
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template<typename Builder>
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typename Builder::OutputType serialized() const;
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template<typename Builder>
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void serialize(Builder&) const;
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DeprecatedString as_string_or(DeprecatedString const& alternative) const
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{
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if (is_string())
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return as_string();
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return alternative;
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}
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DeprecatedString to_deprecated_string() const
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{
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if (is_string())
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return as_string();
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return serialized<StringBuilder>();
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}
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int to_int(int default_value = 0) const { return to_i32(default_value); }
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i32 to_i32(i32 default_value = 0) const { return to_number<i32>(default_value); }
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i64 to_i64(i64 default_value = 0) const { return to_number<i64>(default_value); }
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unsigned to_uint(unsigned default_value = 0) const { return to_u32(default_value); }
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u32 to_u32(u32 default_value = 0) const { return to_number<u32>(default_value); }
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u64 to_u64(u64 default_value = 0) const { return to_number<u64>(default_value); }
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float to_float(float default_value = 0) const { return to_number<float>(default_value); }
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double to_double(double default_value = 0) const { return to_number<double>(default_value); }
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FlatPtr to_addr(FlatPtr default_value = 0) const
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{
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#ifdef __LP64__
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return to_u64(default_value);
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#else
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return to_u32(default_value);
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#endif
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}
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bool to_bool(bool default_value = false) const
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{
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if (!is_bool())
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return default_value;
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return as_bool();
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}
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i32 as_i32() const
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{
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VERIFY(is_i32());
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return m_value.as_i32;
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}
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u32 as_u32() const
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{
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VERIFY(is_u32());
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return m_value.as_u32;
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}
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i64 as_i64() const
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{
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VERIFY(is_i64());
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return m_value.as_i64;
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}
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u64 as_u64() const
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{
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VERIFY(is_u64());
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return m_value.as_u64;
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}
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bool as_bool() const
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{
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VERIFY(is_bool());
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return m_value.as_bool;
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}
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DeprecatedString as_string() const
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{
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VERIFY(is_string());
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return *m_value.as_string;
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}
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JsonObject& as_object()
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{
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VERIFY(is_object());
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return *m_value.as_object;
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}
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JsonObject const& as_object() const
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{
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VERIFY(is_object());
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return *m_value.as_object;
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}
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JsonArray& as_array()
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{
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VERIFY(is_array());
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return *m_value.as_array;
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}
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JsonArray const& as_array() const
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{
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VERIFY(is_array());
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return *m_value.as_array;
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}
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double as_double() const
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{
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VERIFY(is_double());
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return m_value.as_double;
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}
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Type type() const
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{
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return m_type;
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}
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bool is_null() const { return m_type == Type::Null; }
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bool is_bool() const { return m_type == Type::Bool; }
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bool is_string() const { return m_type == Type::String; }
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bool is_i32() const { return m_type == Type::Int32; }
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bool is_u32() const { return m_type == Type::UnsignedInt32; }
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bool is_i64() const { return m_type == Type::Int64; }
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bool is_u64() const { return m_type == Type::UnsignedInt64; }
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bool is_double() const { return m_type == Type::Double; }
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bool is_array() const { return m_type == Type::Array; }
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bool is_object() const { return m_type == Type::Object; }
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bool is_number() const
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{
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switch (m_type) {
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case Type::Int32:
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case Type::UnsignedInt32:
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case Type::Int64:
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case Type::UnsignedInt64:
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case Type::Double:
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return true;
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default:
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return false;
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}
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}
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template<typename T>
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T to_number(T default_value = 0) const
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{
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if (is_double())
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return (T)as_double();
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if (type() == Type::Int32)
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return (T)as_i32();
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if (type() == Type::UnsignedInt32)
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return (T)as_u32();
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if (type() == Type::Int64)
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return (T)as_i64();
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if (type() == Type::UnsignedInt64)
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return (T)as_u64();
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return default_value;
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}
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template<Integral T>
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bool is_integer() const
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{
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switch (m_type) {
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case Type::Int32:
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return is_within_range<T>(m_value.as_i32);
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case Type::UnsignedInt32:
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return is_within_range<T>(m_value.as_u32);
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case Type::Int64:
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return is_within_range<T>(m_value.as_i64);
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case Type::UnsignedInt64:
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return is_within_range<T>(m_value.as_u64);
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default:
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return false;
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}
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}
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template<Integral T>
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T as_integer() const
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{
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VERIFY(is_integer<T>());
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switch (m_type) {
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case Type::Int32:
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return static_cast<T>(m_value.as_i32);
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case Type::UnsignedInt32:
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return static_cast<T>(m_value.as_u32);
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case Type::Int64:
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return static_cast<T>(m_value.as_i64);
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case Type::UnsignedInt64:
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return static_cast<T>(m_value.as_u64);
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default:
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VERIFY_NOT_REACHED();
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}
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}
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bool equals(JsonValue const& other) const;
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private:
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void clear();
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void copy_from(JsonValue const&);
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Type m_type { Type::Null };
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union {
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StringImpl* as_string { nullptr };
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JsonArray* as_array;
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JsonObject* as_object;
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double as_double;
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i32 as_i32;
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u32 as_u32;
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i64 as_i64;
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u64 as_u64;
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bool as_bool;
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} m_value;
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};
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template<>
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struct Formatter<JsonValue> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, JsonValue const& value)
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{
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return Formatter<StringView>::format(builder, value.to_deprecated_string());
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}
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};
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}
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#if USING_AK_GLOBALLY
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using AK::JsonValue;
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#endif
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