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#ifndef TAKANE_UTILS_JSON_HPP
#define TAKANE_UTILS_JSON_HPP
#include <string>
#include <stdexcept>
#include <unordered_map>
#include <filesystem>
#include "millijson/millijson.hpp"
namespace takane {
namespace internal_json {
typedef std::unordered_map<std::string, std::shared_ptr<millijson::Base> > JsonObjectMap;
template<typename Path_>
std::shared_ptr<millijson::Base> parse_file(const Path_& path) {
if constexpr(std::is_same<typename Path_::value_type, char>::value) {
return millijson::parse_file(path.c_str());
} else {
auto cpath = path.string();
return millijson::parse_file(cpath.c_str());
}
}
inline const JsonObjectMap& extract_object(const JsonObjectMap& x, const std::string& name) {
auto xIt = x.find(name);
if (xIt == x.end()) {
throw std::runtime_error("property is not present");
}
const auto& val = xIt->second;
if (val->type() != millijson::OBJECT) {
throw std::runtime_error("property should be a JSON object");
}
return reinterpret_cast<millijson::Object*>(val.get())->values;
}
inline const std::string& extract_string(const JsonObjectMap& x, const std::string& name) {
auto xIt = x.find(name);
if (xIt == x.end()) {
throw std::runtime_error("property is not present");
}
const auto& val = xIt->second;
if (val->type() != millijson::STRING) {
throw std::runtime_error("property should be a JSON string");
}
return reinterpret_cast<millijson::String*>(val.get())->value;
}
template<class Function_>
const JsonObjectMap& extract_object(const JsonObjectMap& x, const std::string& name, Function_ rethrow) {
const JsonObjectMap* output = NULL;
try {
output = &(extract_object(x, name));
} catch (std::exception& e) {
rethrow(e);
}
return *output;
}
template<class Function_>
const std::string& extract_string(const JsonObjectMap& x, const std::string& name, Function_ rethrow) {
const std::string* output = NULL;
try {
output = &(extract_string(x, name));
} catch (std::exception& e) {
rethrow(e);
}
return *output;
}
inline const JsonObjectMap& extract_typed_object_from_metadata(const JsonObjectMap& x, const std::string& type) {
return internal_json::extract_object(x, type, [&](std::exception& e) {
throw std::runtime_error("failed to extract '" + type + "' from the object metadata; " + std::string(e.what()));
});
}
inline const std::string& extract_string_from_typed_object(const JsonObjectMap& x, const std::string& name, const std::string& type) {
return extract_string(x, name, [&](std::exception& e) {
throw std::runtime_error("failed to extract '" + type + "." + name + "' from the object metadata; " + std::string(e.what()));
});
}
inline const std::string& extract_version_for_type(const JsonObjectMap& x, const std::string& type) {
const auto& obj = extract_typed_object_from_metadata(x, type);
return extract_string_from_typed_object(obj, "version", type);
}
}
}
#endif
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