mirror of
https://github.com/geode-sdk/geode.git
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306 lines
9.6 KiB
C++
306 lines
9.6 KiB
C++
#pragma once
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#include "../external/json/json.hpp"
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#include "../loader/Log.hpp"
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#include <set>
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#include <variant>
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namespace geode {
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template <class Json>
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struct JsonChecker;
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template <typename T, typename = void>
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struct is_iterable : std::false_type {};
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template <typename T>
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struct is_iterable<
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T, std::void_t<decltype(std::begin(std::declval<T>())), decltype(std::end(std::declval<T>()))>> :
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std::true_type {};
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template <typename T>
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constexpr bool is_iterable_v = is_iterable<T>::value;
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namespace {
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using value_t = nlohmann::detail::value_t;
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constexpr char const* jsonValueTypeToString(value_t type) {
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switch (type) {
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default:
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case value_t::null: return "null";
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case value_t::object: return "object";
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case value_t::array: return "array";
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case value_t::string: return "string";
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case value_t::boolean: return "boolean";
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case value_t::binary: return "binary";
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case value_t::discarded: return "discarded";
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case value_t::number_integer: return "integer";
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case value_t::number_unsigned: return "integer";
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case value_t::number_float: return "number";
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}
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}
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template <class T>
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constexpr value_t getJsonType() {
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if constexpr (std::is_same_v<T, bool>) {
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return value_t::boolean;
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}
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else if constexpr (std::is_floating_point_v<T>) {
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return value_t::number_float;
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}
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else if constexpr (std::is_unsigned_v<T>) {
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return value_t::number_unsigned;
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}
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else if constexpr (std::is_integral_v<T>) {
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return value_t::number_integer;
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}
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else if constexpr (std::is_constructible_v<T, std::string>) {
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return value_t::string;
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}
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else if constexpr (is_iterable_v<T>) {
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return value_t::array;
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}
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return value_t::null;
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}
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bool jsonConvertibleTo(value_t value, value_t to) {
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// if we don't know the type we're passing into,
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// everything's valid
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if (to == value_t::null) return true;
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if (value == value_t::number_float || value == value_t::number_integer ||
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value == value_t::number_unsigned) {
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return to == value_t::number_float || to == value_t::number_integer ||
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to == value_t::number_unsigned;
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}
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return value == to;
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}
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}
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template <class T>
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using JsonValueValidator = std::function<bool(T const&)>;
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template <class Json>
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struct JsonMaybeObject;
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template <class Json>
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struct JsonMaybeValue;
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template <class Json>
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struct JsonMaybeSomething {
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protected:
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JsonChecker<Json>& m_checker;
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Json& m_json;
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std::string m_hierarchy;
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bool m_hasValue;
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friend struct JsonMaybeObject<Json>;
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friend struct JsonMaybeValue<Json>;
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GEODE_DLL void setError(std::string const& error);
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public:
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GEODE_DLL Json& json();
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GEODE_DLL JsonMaybeSomething(
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JsonChecker<Json>& checker, Json& json, std::string const& hierarchy, bool hasValue
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);
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GEODE_DLL bool isError() const;
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GEODE_DLL operator bool() const;
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};
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template <class Json>
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struct JsonMaybeValue : public JsonMaybeSomething<Json> {
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bool m_inferType = true;
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GEODE_DLL JsonMaybeValue(
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JsonChecker<Json>& checker, Json& json, std::string const& hierarchy, bool hasValue
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);
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GEODE_DLL JsonMaybeSomething<Json>& self();
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template <nlohmann::detail::value_t T>
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JsonMaybeValue<Json>& as() {
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if (this->isError()) return *this;
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if (!jsonConvertibleTo(self().m_json.type(), T)) {
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this->setError(
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self().m_hierarchy + ": Invalid type \"" + self().m_json.type_name() +
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"\", expected \"" + jsonValueTypeToString(T) + "\""
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);
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}
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m_inferType = false;
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return *this;
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}
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GEODE_DLL JsonMaybeValue<Json>& array();
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template <nlohmann::detail::value_t... T>
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JsonMaybeValue<Json>& asOneOf() {
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if (this->isError()) return *this;
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bool isOneOf = (... || jsonConvertibleTo(self().m_json.type(), T));
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if (!isOneOf) {
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this->setError(
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self().m_hierarchy + ": Invalid type \"" + self().m_json.type_name() +
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"\", expected one of \"" + (jsonValueTypeToString(T), ...) + "\""
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);
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}
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m_inferType = false;
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return *this;
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}
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template <nlohmann::detail::value_t T>
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JsonMaybeValue<Json>& is() {
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if (this->isError()) return *this;
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self().m_hasValue = jsonConvertibleTo(self().m_json.type(), T);
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m_inferType = false;
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return *this;
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}
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template <class T>
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JsonMaybeValue<Json>& validate(JsonValueValidator<T> validator) {
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if (this->isError()) return *this;
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try {
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if (!validator(self().m_json.template get<T>())) {
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this->setError(self().m_hierarchy + ": Invalid value format");
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}
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}
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catch (...) {
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this->setError(
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self().m_hierarchy + ": Invalid type \"" +
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std::string(self().m_json.type_name()) + "\""
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);
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}
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return *this;
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}
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template <class T>
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JsonMaybeValue<Json>& validate(bool (*validator)(T const&)) {
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return this->validate(std::function(validator));
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}
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template <class T>
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JsonMaybeValue<Json>& inferType() {
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if (this->isError() || !m_inferType) return *this;
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return this->as<getJsonType<T>()>();
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}
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template <class T>
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JsonMaybeValue<Json>& intoRaw(T& target) {
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if (this->isError()) return *this;
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target = self().m_json;
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return *this;
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}
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template <class T>
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JsonMaybeValue<Json>& into(T& target) {
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return this->intoAs<T, T>(target);
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}
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template <class T>
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JsonMaybeValue<Json>& into(std::optional<T>& target) {
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return this->intoAs<T, std::optional<T>>(target);
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}
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template <class A, class T>
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JsonMaybeValue<Json>& intoAs(T& target) {
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this->inferType<A>();
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if (this->isError()) return *this;
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try {
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target = self().m_json.template get<A>();
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}
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catch (...) {
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this->setError(
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self().m_hierarchy + ": Invalid type \"" +
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std::string(self().m_json.type_name()) + "\""
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);
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}
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return *this;
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}
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template <class T>
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T get() {
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this->inferType<T>();
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if (this->isError()) return T();
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try {
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return self().m_json.template get<T>();
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}
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catch (...) {
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this->setError(
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self().m_hierarchy + ": Invalid type to get \"" +
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std::string(self().m_json.type_name()) + "\""
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);
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}
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return T();
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}
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GEODE_DLL JsonMaybeObject<Json> obj();
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template <class T>
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struct Iterator {
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std::vector<T> m_values;
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using iterator = typename std::vector<T>::iterator;
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using const_iterator = typename std::vector<T>::const_iterator;
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iterator begin() {
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return m_values.begin();
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}
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iterator end() {
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return m_values.end();
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}
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const_iterator begin() const {
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return m_values.begin();
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}
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const_iterator end() const {
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return m_values.end();
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}
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};
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GEODE_DLL JsonMaybeValue<Json> at(size_t i);
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GEODE_DLL Iterator<JsonMaybeValue<Json>> iterate();
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GEODE_DLL Iterator<std::pair<std::string, JsonMaybeValue<Json>>> items();
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};
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template <class Json>
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struct JsonMaybeObject : JsonMaybeSomething<Json> {
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std::set<std::string> m_knownKeys;
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GEODE_DLL JsonMaybeObject(
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JsonChecker<Json>& checker, Json& json, std::string const& hierarchy, bool hasValue
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);
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GEODE_DLL JsonMaybeSomething<Json>& self();
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GEODE_DLL void addKnownKey(std::string const& key);
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GEODE_DLL Json& json();
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GEODE_DLL JsonMaybeValue<Json> emptyValue();
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GEODE_DLL JsonMaybeValue<Json> has(std::string const& key);
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GEODE_DLL JsonMaybeValue<Json> needs(std::string const& key);
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GEODE_DLL void checkUnknownKeys();
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};
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template <class Json = nlohmann::json>
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struct JsonChecker {
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std::variant<std::monostate, std::string> m_result;
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Json& m_json;
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GEODE_DLL JsonChecker(Json& json);
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GEODE_DLL bool isError() const;
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GEODE_DLL std::string getError() const;
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GEODE_DLL JsonMaybeValue<Json> root(std::string const& hierarchy);
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};
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}
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