mirror of
https://github.com/LadybirdBrowser/ladybird.git
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250 lines
6.5 KiB
C++
250 lines
6.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2024, Dan Klishch <danilklishch@gmail.com>
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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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#include <AK/ByteString.h>
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#include <AK/Forward.h>
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#include <AK/Optional.h>
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#include <AK/OwnPtr.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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Bool,
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Number,
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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();
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~JsonValue();
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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(ByteString 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_value { static_cast<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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JsonValue& operator=(JsonArray const&);
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JsonValue& operator=(JsonObject const&);
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JsonValue& operator=(JsonArray&&);
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JsonValue& operator=(JsonObject&&);
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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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ByteString as_string_or(ByteString 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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ByteString deprecated_to_byte_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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Optional<int> get_int() const { return get_integer<int>(); }
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Optional<i32> get_i32() const { return get_integer<i32>(); }
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Optional<i64> get_i64() const { return get_integer<i64>(); }
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Optional<unsigned> get_uint() const { return get_integer<unsigned>(); }
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Optional<u32> get_u32() const { return get_integer<u32>(); }
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Optional<u64> get_u64() const { return get_integer<u64>(); }
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Optional<float> get_float_with_precision_loss() const { return get_number_with_precision_loss<float>(); }
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Optional<double> get_double_with_precision_loss() const { return get_number_with_precision_loss<double>(); }
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Optional<FlatPtr> get_addr() const
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{
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// Note: This makes the lambda dependent on the template parameter, which is necessary
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// for the `if constexpr` to not evaluate both branches.
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auto fn = [&]<typename T>() -> Optional<T> {
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if constexpr (IsSame<T, u64>) {
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return get_u64();
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} else {
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return get_u32();
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}
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};
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return fn.operator()<FlatPtr>();
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}
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Optional<bool> get_bool() const
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{
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if (!is_bool())
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return {};
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return as_bool();
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}
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bool as_bool() const
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{
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return m_value.get<bool>();
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}
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ByteString const& as_string() const
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{
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return m_value.get<ByteString>();
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}
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JsonObject& as_object()
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{
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return *m_value.get<NonnullOwnPtr<JsonObject>>();
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}
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JsonObject const& as_object() const
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{
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return *m_value.get<NonnullOwnPtr<JsonObject>>();
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}
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JsonArray& as_array()
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{
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return *m_value.get<NonnullOwnPtr<JsonArray>>();
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}
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JsonArray const& as_array() const
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{
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return *m_value.get<NonnullOwnPtr<JsonArray>>();
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}
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Variant<u64, i64, double> as_number() const
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{
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return m_value.downcast<u64, i64, double>();
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}
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Type type() const
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{
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return m_value.visit(
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[](Empty const&) { return Type::Null; },
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[](bool const&) { return Type::Bool; },
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[](Arithmetic auto const&) { return Type::Number; },
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[](ByteString const&) { return Type::String; },
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[](NonnullOwnPtr<JsonArray> const&) { return Type::Array; },
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[](NonnullOwnPtr<JsonObject> const&) { return Type::Object; });
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}
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bool is_null() const { return m_value.has<Empty>(); }
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bool is_bool() const { return m_value.has<bool>(); }
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bool is_string() const { return m_value.has<ByteString>(); }
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bool is_array() const { return m_value.has<NonnullOwnPtr<JsonArray>>(); }
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bool is_object() const { return m_value.has<NonnullOwnPtr<JsonObject>>(); }
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bool is_number() const
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{
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return m_value.visit(
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[](bool const&) { return false; },
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[]<Arithmetic U>(U const&) { return true; },
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[](auto const&) { return false; });
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}
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template<typename T>
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Optional<T> get_number_with_precision_loss() const
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{
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return m_value.visit(
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[](bool const&) { return Optional<T> {}; },
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[]<Arithmetic U>(U const& value) { return Optional<T> { static_cast<T>(value) }; },
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[](auto const&) { return Optional<T> {}; });
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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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return get_integer<T>().has_value();
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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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return get_integer<T>().value();
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}
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template<Integral T>
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Optional<T> get_integer() const
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{
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return m_value.visit(
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[](bool const&) { return Optional<T> {}; },
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[]<Arithmetic U>(U const& value) -> Optional<T> {
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if constexpr (Integral<U>) {
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if (!is_within_range<T>(value))
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return {};
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return static_cast<T>(value);
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} else {
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// FIXME: Make is_within_range work with floating point numbers.
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if (static_cast<U>(static_cast<T>(value)) != value)
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return {};
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return static_cast<T>(value);
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}
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},
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[](auto const&) { return Optional<T> {}; });
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}
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bool equals(JsonValue const& other) const;
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private:
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Variant<
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Empty,
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bool,
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i64,
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u64,
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double,
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ByteString,
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NonnullOwnPtr<JsonArray>,
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NonnullOwnPtr<JsonObject>>
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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.serialized<StringBuilder>());
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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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