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#ifndef INCLUDED_SRC_UTILS_CPP_JSON_HPP
#define INCLUDED_SRC_UTILS_CPP_JSON_HPP
#include <algorithm>
#include <optional>
#include <sstream>
#include <string>
#include "gsl-lite/gsl-lite.hpp"
#include "nlohmann/json.hpp"
template <typename ValueT>
auto ExtractValueAs(
nlohmann::json const& j,
std::string const& key,
std::function<void(std::string const& error)>&& logger =
[](std::string const& /*unused*/) -> void {}) noexcept
-> std::optional<ValueT> {
try {
auto it = j.find(key);
if (it == j.end()) {
logger("key " + key + " cannot be found in JSON object");
return std::nullopt;
}
return it.value().template get<ValueT>();
} catch (std::exception& e) {
logger(e.what());
return std::nullopt;
}
}
namespace detail {
[[nodiscard]] static inline auto IndentListsOnlyUntilDepth(
nlohmann::json const& json,
std::string const& indent,
std::size_t until,
std::size_t depth) -> std::string {
using iterator = std::ostream_iterator<std::string>;
if (json.is_object()) {
std::size_t i{};
std::ostringstream oss{};
oss << '{' << std::endl;
for (auto const& [key, value] : json.items()) {
std::fill_n(iterator{oss}, depth + 1, indent);
oss << nlohmann::json(key).dump() << ": "
<< IndentListsOnlyUntilDepth(value, indent, until, depth + 1)
<< (++i == json.size() ? "" : ",") << std::endl;
}
std::fill_n(iterator{oss}, depth, indent);
oss << '}';
gsl_EnsuresAudit(nlohmann::json::parse(oss.str()) == json);
return oss.str();
}
if (json.is_array() and depth < until) {
std::size_t i{};
std::ostringstream oss{};
oss << '[' << std::endl;
for (auto const& value : json) {
std::fill_n(iterator{oss}, depth + 1, indent);
oss << IndentListsOnlyUntilDepth(value, indent, until, depth + 1)
<< (++i == json.size() ? "" : ",") << std::endl;
}
std::fill_n(iterator{oss}, depth, indent);
oss << ']';
gsl_EnsuresAudit(nlohmann::json::parse(oss.str()) == json);
return oss.str();
}
return json.dump();
}
} // namespace detail
/// \brief Dump json with indent. Indent lists only until specified depth.
[[nodiscard]] static inline auto IndentListsOnlyUntilDepth(
nlohmann::json const& json,
std::size_t indent,
std::size_t until_depth = 0) -> std::string {
return detail::IndentListsOnlyUntilDepth(
json, std::string(indent, ' '), until_depth, 0);
}
#endif // INCLUDED_SRC_UTILS_CPP_JSON_HPP
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