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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_UTILS_CPP_JSON_HPP
#define INCLUDED_SRC_UTILS_CPP_JSON_HPP
#include <algorithm>
#include <cstddef>
#include <optional>
#include <sstream>
#include <string>
#include <unordered_map>
#include "fmt/core.h"
#include "fmt/ostream.h"
#include "gsl/gsl"
#include "nlohmann/json.hpp"
#include "src/utils/cpp/gsl.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 {
// NOLINTNEXTLINE(misc-no-recursion)
[[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 << '}';
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 << ']';
EnsuresAudit(nlohmann::json::parse(oss.str()) == json);
return oss.str();
}
return json.dump();
}
// NOLINTNEXTLINE(misc-no-recursion)
[[nodiscard]] static inline auto IndentOnlyUntilDepth(
nlohmann::json const& json,
std::string const& indent,
std::size_t until,
std::size_t depth,
std::optional<std::string> path,
std::unordered_map<std::string, std::size_t> const& depths) -> std::string {
using iterator = std::ostream_iterator<std::string>;
if (path and depths.find(*path) != depths.end()) {
until = depths.find(*path)->second;
}
if (json.is_object() and depth < until) {
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() << ": "
<< IndentOnlyUntilDepth(
value,
indent,
until,
depth + 1,
path ? std::optional<std::string>(*path + "/" + key)
: std::nullopt,
depths)
<< (++i == json.size() ? "" : ",") << std::endl;
}
std::fill_n(iterator{oss}, depth, indent);
oss << '}';
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 << IndentOnlyUntilDepth(
value, indent, until, depth + 1, std::nullopt, depths)
<< (++i == json.size() ? "" : ",") << std::endl;
}
std::fill_n(iterator{oss}, depth, indent);
oss << ']';
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);
}
// \brief Dump json with indent. Indent until the given list; for initial
// pure object-paths, alternative depths can be specified
[[nodiscard]] static inline auto IndentOnlyUntilDepth(
nlohmann::json const& json,
std::size_t indent,
std::size_t until_depth,
std::unordered_map<std::string, std::size_t> const& depths) -> std::string {
return detail::IndentOnlyUntilDepth(
json, std::string(indent, ' '), until_depth, 0, "", depths);
}
// \brief Dump json, replacing subexpressions at the given depths by "*".
// NOLINTNEXTLINE(misc-no-recursion)
[[nodiscard]] static inline auto TruncateJson(nlohmann::json const& json,
std::size_t depth)
-> std::string {
if (depth == 0) {
return "*";
}
if (json.is_object()) {
std::size_t i{};
std::ostringstream oss{};
oss << '{';
for (auto const& [key, value] : json.items()) {
oss << nlohmann::json(key).dump() << ":"
<< TruncateJson(value, depth - 1)
<< (++i == json.size() ? "" : ",");
}
oss << '}';
return oss.str();
}
if (json.is_array()) {
std::size_t i{};
std::ostringstream oss{};
oss << '[';
for (auto const& value : json) {
oss << TruncateJson(value, depth - 1)
<< (++i == json.size() ? "" : ",");
}
oss << ']';
return oss.str();
}
return json.dump();
}
[[nodiscard]] static inline auto AbbreviateJson(nlohmann::json const& json,
std::size_t len)
-> std::string {
auto json_string = json.dump();
if (json_string.size() <= len) {
return json_string;
}
std::size_t i = 1;
auto old_abbrev = TruncateJson(json, i);
auto new_abbrev = old_abbrev;
while (new_abbrev.size() <= len) {
old_abbrev = new_abbrev;
++i;
new_abbrev = TruncateJson(json, i);
}
return old_abbrev;
}
#if defined(FMT_VERSION) and FMT_VERSION >= 100000
// Use nlohmann::basic_json::operator<<() for formatting via libfmt.
// This explicit template specialization seems to be required starting with
// libfmt 10.x.
template <>
struct fmt::formatter<nlohmann::basic_json<>> : ostream_formatter {};
#endif
#endif // INCLUDED_SRC_UTILS_CPP_JSON_HPP
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