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/* SPDX-License-Identifier: GPL-2.0-or-later */
#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);
}
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 DictionaryValue *Value::as_dictionary_value() const
{
if (type_ != eValueType::Dictionary) {
return nullptr;
}
return static_cast<const DictionaryValue *>(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 would
* return use a null value, in stead of an empty array. */
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 DictionaryValue &value)
{
const DictionaryValue::Items &attributes = value.elements();
/* Create a json object to store the attributes. If this isn't done and attributes is empty it
* would return use a null value, in stead of an empty object. */
j = "{}"_json;
for (const DictionaryValue::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()->value();
break;
}
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::Dictionary: {
const DictionaryValue &object = *value.as_dictionary_value();
convert_to_json(j, object);
break;
}
case eValueType::Null: {
j = nullptr;
break;
}
case eValueType::Boolean: {
j = value.as_boolean_value()->value();
break;
}
case eValueType::Double: {
j = value.as_double_value()->value();
}
}
}
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<DictionaryValue> convert_from_json_to_object(
const nlohmann::ordered_json &j)
{
std::unique_ptr<DictionaryValue> object = std::make_unique<DictionaryValue>();
DictionaryValue::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);
}
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
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