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// Copyright 2024 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.
#include "src/buildtool/file_system/precomputed_root.hpp"
#include <compare>
#include <exception>
#include "fmt/core.h"
#include "gsl/gsl"
#include "src/utils/cpp/hash_combine.hpp"
namespace {
template <typename T>
[[nodiscard]] auto ParseImpl(nlohmann::json const& /*root*/)
-> expected<T, std::string> {
Ensures(false);
}
template <typename T>
[[nodiscard]] auto ParsePrecomputed(nlohmann::json const& root) noexcept
-> expected<PrecomputedRoot, std::string> {
try {
auto parsed_root = ParseImpl<T>(root);
if (not parsed_root) {
return unexpected{fmt::format("While parsing {} root {}:\n{}",
T::kMarker,
root.dump(),
std::move(parsed_root).error())};
}
return PrecomputedRoot{*std::move(parsed_root)};
} catch (const std::exception& e) {
return unexpected{fmt::format("While parsing {} root {}:\n{}",
T::kMarker,
root.dump(),
e.what())};
}
}
template <>
[[nodiscard]] auto ParseImpl<ComputedRoot>(nlohmann::json const& root)
-> expected<ComputedRoot, std::string> {
if (root.size() != ComputedRoot::kSchemeLength) {
return unexpected{fmt::format(
"The root has a wrong number of arguments: {}\nThe scheme requires "
"[<scheme>, <root>, <module>, <name>, <config>]",
root.dump())};
}
if (not root[1].is_string()) {
return unexpected{fmt::format(
"The root has a wrong type of <root>. Expected a string, got {}",
root[1].dump())};
}
if (not root[2].is_string()) {
return unexpected{fmt::format(
"The root has a wrong type of <module>. Expected a string, got {}",
root[2].dump())};
}
if (not root[3].is_string()) {
return unexpected{fmt::format(
"The root has a wrong type of <name>. Expected a string, got {}",
root[3].dump())};
}
if (not root[4].is_object()) {
return unexpected{
fmt::format("The root has a wrong type of <config>. Expected a "
"plain json, got {}",
root[4].dump())};
}
return ComputedRoot{.repository = std::string{root[1]},
.target_module = std::string{root[2]},
.target_name = std::string{root[3]},
.config = root[4]};
}
template <>
[[nodiscard]] auto ParseImpl<TreeStructureRoot>(nlohmann::json const& root)
-> expected<TreeStructureRoot, std::string> {
if (root.size() != TreeStructureRoot::kSchemeLength and
root.size() != TreeStructureRoot::kSchemePragmaLength) {
return unexpected{
fmt::format("The root has a wrong number of arguments: {}\nThe "
"scheme requires [<scheme>, <root>] optionally "
"followed by a pragma object",
root.dump())};
}
if (not root[1].is_string()) {
return unexpected{fmt::format(
"The root has a wrong type of <root>. Expected a string, got {}",
root[1].dump())};
}
bool absent = false;
if (root.size() == TreeStructureRoot::kSchemePragmaLength) {
if (not root[2].is_object()) {
return unexpected{
fmt::format("The root has a wrong type of optional pragma "
"argument. Expected a plain json object, got {}",
root[2].dump())};
}
if (root[2].contains("absent")) {
auto const& absent_entry = root[2].at("absent");
if (not absent_entry.is_null() and not absent_entry.is_boolean()) {
return unexpected{
fmt::format("Expected pragma entry \"absent\" to be "
"boolean, but found {}",
absent_entry.dump())};
}
absent =
absent_entry.is_boolean() and absent_entry.template get<bool>();
}
}
return TreeStructureRoot{.repository = root[1].template get<std::string>(),
.absent = absent};
}
} // namespace
auto ComputedRoot::operator==(ComputedRoot const& other) const noexcept
-> bool {
return repository == other.repository and
target_module == other.target_module and
target_name == other.target_name and config == other.config;
}
auto ComputedRoot::operator<(ComputedRoot const& other) const noexcept -> bool {
if (auto const res = repository <=> other.repository; res != 0) {
return res < 0;
}
if (auto const res = target_module <=> other.target_module; res != 0) {
return res < 0;
}
if (auto const res = target_name <=> other.target_name; res != 0) {
return res < 0;
}
return config < other.config;
}
auto ComputedRoot::ToString() const -> std::string {
return fmt::format("([\"@\", {}, {}, {}], {})",
nlohmann::json(repository).dump(),
nlohmann::json(target_module).dump(),
nlohmann::json(target_name).dump(),
config.dump());
}
auto ComputedRoot::ComputeHash() const -> std::size_t {
size_t seed{};
hash_combine<std::string>(&seed, kMarker);
hash_combine<std::string>(&seed, repository);
hash_combine<std::string>(&seed, target_module);
hash_combine<std::string>(&seed, target_name);
hash_combine<nlohmann::json>(&seed, config);
return seed;
}
auto TreeStructureRoot::operator==(
TreeStructureRoot const& other) const noexcept -> bool {
return absent == other.absent and repository == other.repository;
}
auto TreeStructureRoot::operator<(TreeStructureRoot const& other) const noexcept
-> bool {
if (absent != other.absent) {
return absent;
}
return repository < other.repository;
}
auto TreeStructureRoot::ToString() const -> std::string {
return fmt::format("[\"tree structure\", {}{}]",
nlohmann::json(repository).dump(),
absent ? ", {\"absent\": true}" : "");
}
auto TreeStructureRoot::ComputeHash() const -> std::size_t {
std::size_t seed{};
hash_combine<std::string>(&seed, kMarker);
hash_combine<std::string>(&seed, repository);
hash_combine<bool>(&seed, absent);
return seed;
}
auto PrecomputedRoot::Parse(nlohmann::json const& root) noexcept
-> expected<PrecomputedRoot, std::string> {
if ((not root.is_array()) or root.empty()) {
return unexpected{
fmt::format("The root is empty or has unsupported format: \"{}\"",
root.dump())};
}
if (root[0] == ComputedRoot::kMarker) {
return ParsePrecomputed<ComputedRoot>(root);
}
if (root[0] == TreeStructureRoot::kMarker) {
return ParsePrecomputed<TreeStructureRoot>(root);
}
return unexpected{
fmt::format("Unknown precomputed type of the root {}", root.dump())};
}
auto PrecomputedRoot::ToString() const noexcept -> std::string {
try {
return std::visit([](auto const& r) { return r.ToString(); }, root_);
} catch (...) {
Ensures(false);
}
}
auto PrecomputedRoot::GetReferencedRepository() const noexcept -> std::string {
try {
return std::visit([](auto const& r) { return r.repository; }, root_);
} catch (...) {
Ensures(false);
}
}
auto PrecomputedRoot::ComputeHash(root_t const& root) -> std::size_t {
return std::visit([](auto const& r) { return r.ComputeHash(); }, root);
}
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