1 files changed, 90 insertions, 0 deletions
diff --git a/src/other_tools/utils/parse_precomputed_root.cpp b/src/other_tools/utils/parse_precomputed_root.cpp
new file mode 100644
index 00000000..0b176450
--- /dev/null
+++ b/src/other_tools/utils/parse_precomputed_root.cpp
@@ -0,0 +1,90 @@
+// 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/other_tools/utils/parse_precomputed_root.hpp"
+
+#include <utility>
+
+#include "fmt/core.h"
+#include "nlohmann/json.hpp"
+#include "src/buildtool/build_engine/expression/expression.hpp"
+
+namespace {
+[[nodiscard]] auto ParseComputedRoot(ExpressionPtr const& repository)
+    -> expected<ComputedRoot, std::string> {
+    auto const repo = repository->Get("repo", Expression::none_t{});
+    if (not repo.IsNotNull()) {
+        return unexpected<std::string>{"Mandatory key \"repo\" is missing"};
+    }
+    if (not repo->IsString()) {
+        return unexpected{fmt::format("Unsupported value for key \"repo\":\n{}",
+                                      repo->ToString())};
+    }
+
+    auto const target = repository->Get("target", Expression::none_t{});
+    if (not target.IsNotNull()) {
+        return unexpected<std::string>{"Mandatory key \"target\" is missing"};
+    }
+    if (not target->IsList() or target->List().size() != 2) {
+        return unexpected{fmt::format(
+            "Unsupported value for key \"target\":\n{}", target->ToString())};
+    }
+    auto const& target_list = target->List();
+    auto const target_module = target_list.at(0);
+    auto const target_name = target_list.at(1);
+    if (not target_module->IsString() or not target_name->IsString()) {
+        return unexpected{fmt::format(
+            "Unsupported format for key \"target\":\n{}", target->ToString())};
+    }
+
+    auto const config = repository->Get("config", Expression::none_t{});
+    if (config.IsNotNull() and not config->IsMap()) {
+        return unexpected{fmt::format(
+            "Unsupported value for key \"config\":\n{}", config->ToString())};
+    }
+    return ComputedRoot{.repository = repo->String(),
+                        .target_module = target_module->String(),
+                        .target_name = target_module->String(),
+                        .config = config.IsNotNull()
+                                      ? config->ToJson()
+                                      : nlohmann::json::object()};
+}
+}  // namespace
+
+auto ParsePrecomputedRoot(ExpressionPtr const& repository)
+    -> expected<PrecomputedRoot, std::string> {
+    if (not repository.IsNotNull() or not repository->IsMap()) {
+        return unexpected<std::string>{"Repository has an incorrect format"};
+    }
+
+    auto const type = repository->Get("type", Expression::none_t());
+    if (not type.IsNotNull()) {
+        return unexpected<std::string>{"Mandatory key \"type\" is missing"};
+    }
+    if (not type->IsString()) {
+        return unexpected{fmt::format("Unsupported value for key \"type\":\n{}",
+                                      type->ToString())};
+    }
+
+    auto const& type_marker = type->String();
+    if (type_marker == ComputedRoot::kMarker) {
+        auto computed = ParseComputedRoot(repository);
+        if (not computed) {
+            return unexpected{std::move(computed).error()};
+        }
+        return PrecomputedRoot{*std::move(computed)};
+    }
+    return unexpected{
+        fmt::format("Unknown type {} of precomputed repository", type_marker)};
+}