Differential D12544 Diff 43384 source/blender/blenlib/intern/serialize.cc

Changeset View

Standalone View

source/blender/blenlib/intern/serialize.cc

This file was added.

				#include "BLI_serialize.hh"

				#include "json.hpp"

				namespace blender::io::serialize {

				const StringValue *Value::as_string_value() const
				{
				if (type_ != eValueType::String) {
				return nullptr;
				}
				return static_cast<const StringValue *>(this);
				SeverinUnsubmitted Done Inline Actions Didn't the documentation for this function say that there will be an assert for the type-match as well? Severin: Didn't the documentation for this function say that there will be an assert for the type-match…
				jbakkerAuthorUnsubmitted Done Inline Actions Will adapt the documentation. seems like I had a different implementation in my head when writing the docs :-) jbakker: Will adapt the documentation. seems like I had a different implementation in my head when…
				}
				sybrenUnsubmitted Done Inline Actions This assumes that any `Value` with `type_ == eValueType::String` is a `StringValue`. This tight coupling is not documented at all! sybren: This assumes that any `Value` with `type_ == eValueType::String` is a `StringValue`. This tight…

				const IntValue *Value::as_int_value() const
				{
				if (type_ != eValueType::Int) {
				return nullptr;
				}
				return static_cast<const IntValue *>(this);
				}

				const DoubleValue *Value::as_double_value() const
				{
				if (type_ != eValueType::Double) {
				return nullptr;
				}
				return static_cast<const DoubleValue *>(this);
				}

				const BooleanValue *Value::as_boolean_value() const
				{
				if (type_ != eValueType::Boolean) {
				return nullptr;
				}
				return static_cast<const BooleanValue *>(this);
				}

				const ArrayValue *Value::as_array_value() const
				{
				if (type_ != eValueType::Array) {
				return nullptr;
				}
				return static_cast<const ArrayValue *>(this);
				}

				const ObjectValue *Value::as_object_value() const
				{
				if (type_ != eValueType::Object) {
				return nullptr;
				}
				return static_cast<const ObjectValue *>(this);
				}

				static void convert_to_json(nlohmann::ordered_json &j, const Value &value);
				static void convert_to_json(nlohmann::ordered_json &j, const ArrayValue &value)
				{
				const ArrayValue::Items &items = value.elements();
				/* Create a json array to store the elements. If this isn't done and items is empty it will
				* return use a null value, in stead of an empty array. */
				sybrenUnsubmitted Done Inline Actions will → would sybren: will → would
				j = "[]"_json;
				for (const ArrayValue::Item &item_value : items) {
				nlohmann::ordered_json json_item;
				convert_to_json(json_item, *item_value);
				j.push_back(json_item);
				}
				}

				static void convert_to_json(nlohmann::ordered_json &j, const ObjectValue &value)
				{
				const ObjectValue::Items &attributes = value.elements();
				sybrenUnsubmitted Done Inline Actions Why is this necessary at all? sybren: Why is this necessary at all?
				/* Create a json object to store the attributes. If this isn't done and attributes is empty it
				sybrenUnsubmitted Done Inline Actions What is this notation? sybren: What is this notation?
				* will return use a null value, in stead of an empty object. */
				j = "{}"_json;
				sybrenUnsubmitted Done Inline Actions will → would sybren: will → would
				for (const ObjectValue::Item &attribute : attributes) {
				nlohmann::ordered_json json_item;
				convert_to_json(json_item, *attribute.second);
				j[attribute.first] = json_item;
				}
				}

				static void convert_to_json(nlohmann::ordered_json &j, const Value &value)
				{
				switch (value.type()) {
				case eValueType::String: {
				j = value.as_string_value()->string_value();
				break;
				}
				sybrenUnsubmitted Done Inline Actions These should be extracted to their own functions. sybren: These should be extracted to their own functions.

				case eValueType::Int: {
				j = value.as_int_value()->value();
				break;
				}

				case eValueType::Array: {
				const ArrayValue &array = *value.as_array_value();
				convert_to_json(j, array);
				break;
				}

				case eValueType::Object: {
				const ObjectValue &object = *value.as_object_value();
				convert_to_json(j, object);
				break;
				}

				case eValueType::Null: {
				j = nullptr;
				SeverinUnsubmitted Done Inline Actions I would much prefer returning `std::unique_ptr`s here, rather than raw owning pointers. Especially since it's not documented that they are owning and need freeing :) Severin: I would much prefer returning `std::unique_ptr`s here, rather than raw owning pointers.
				break;
				}

				case eValueType::Boolean: {
				j = value.as_boolean_value()->value();
				break;
				}

				case eValueType::Double: {
				j = value.as_double_value()->value();
				sybrenUnsubmitted Done Inline Actions Such blocks should be their own function sybren: Such blocks should be their own function
				}
				}
				}

				static std::unique_ptr<Value> convert_from_json(const nlohmann::ordered_json &j);
				static std::unique_ptr<ArrayValue> convert_from_json_to_array(const nlohmann::ordered_json &j)
				{
				std::unique_ptr<ArrayValue> array = std::make_unique<ArrayValue>();
				ArrayValue::Items &elements = array->elements();
				for (auto element : j.items()) {
				nlohmann::ordered_json element_json = element.value();
				std::unique_ptr<Value> value = convert_from_json(element_json);
				elements.append_as(value.release());
				}
				return array;
				}

				static std::unique_ptr<ObjectValue> convert_from_json_to_object(const nlohmann::ordered_json &j)
				{
				std::unique_ptr<ObjectValue> object = std::make_unique<ObjectValue>();
				ObjectValue::Items &elements = object->elements();
				for (auto element : j.items()) {
				std::string key = element.key();
				nlohmann::ordered_json element_json = element.value();
				std::unique_ptr<Value> value = convert_from_json(element_json);
				elements.append_as(std::pair(key, value.release()));
				}
				return object;
				}

				static std::unique_ptr<Value> convert_from_json(const nlohmann::ordered_json &j)
				{
				switch (j.type()) {
				case nlohmann::json::value_t::array: {
				return convert_from_json_to_array(j);
				}

				case nlohmann::json::value_t::object: {
				return convert_from_json_to_object(j);
				sybrenUnsubmitted Done Inline Actions Then why are they (and this code) even here? sybren: Then why are they (and this code) even here?
				}

				case nlohmann::json::value_t::string: {
				std::string value = j;
				return std::make_unique<StringValue>(value);
				}

				case nlohmann::json::value_t::null: {
				return std::make_unique<NullValue>();
				}

				case nlohmann::json::value_t::boolean: {
				return std::make_unique<BooleanValue>(j);
				}
				case nlohmann::json::value_t::number_integer:
				case nlohmann::json::value_t::number_unsigned: {
				return std::make_unique<IntValue>(j);
				}

				case nlohmann::json::value_t::number_float: {
				return std::make_unique<DoubleValue>(j);
				}

				case nlohmann::json::value_t::binary:
				case nlohmann::json::value_t::discarded:
				/*
				* Binary data isn't supported.
				* Discarded is an internal type of nlohmann.
				*
				* Assert in case we need to parse them.
				*/
				BLI_assert_unreachable();
				return std::make_unique<NullValue>();
				}

				BLI_assert_unreachable();
				return std::make_unique<NullValue>();
				}

				void JsonFormatter::serialize(std::ostream &os, const Value &value)
				{
				nlohmann::ordered_json j;
				convert_to_json(j, value);
				if (indentation_len) {
				os << j.dump(indentation_len);
				}
				else {
				os << j.dump();
				}
				}

				std::unique_ptr<Value> JsonFormatter::deserialize(std::istream &is)
				{
				nlohmann::ordered_json j;
				is >> j;
				return convert_from_json(j);
				}

				} // namespace blender::io::serialize