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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_BUILDTOOL_BUILD_ENGINE_BASE_MAPS_EXPRESSION_FUNCTION_HPP
#define INCLUDED_SRC_BUILDTOOL_BUILD_ENGINE_BASE_MAPS_EXPRESSION_FUNCTION_HPP
#include <functional>
#include <memory>
#include <sstream>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
#include "fmt/core.h"
#include "gsl/gsl"
#include "nlohmann/json.hpp"
#include "src/buildtool/build_engine/expression/configuration.hpp"
#include "src/buildtool/build_engine/expression/evaluator.hpp"
#include "src/buildtool/build_engine/expression/expression.hpp"
#include "src/buildtool/build_engine/expression/expression_ptr.hpp"
#include "src/buildtool/build_engine/expression/function_map.hpp"
#include "src/buildtool/build_engine/expression/linked_map.hpp"
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/gsl.hpp"
namespace BuildMaps::Base {
class ExpressionFunction {
public:
using Ptr = std::shared_ptr<ExpressionFunction>;
using imports_t = std::unordered_map<std::string, gsl::not_null<Ptr>>;
ExpressionFunction(std::vector<std::string> vars,
imports_t imports,
ExpressionPtr expr) noexcept
: vars_{std::move(vars)},
imports_{std::move(imports)},
expr_{std::move(expr)} {}
[[nodiscard]] auto Evaluate(
Configuration const& env,
FunctionMapPtr const& functions,
std::function<void(std::string const&)> const& logger =
[](std::string const& error) noexcept -> void {
Logger::Log(LogLevel::Error, error);
},
std::function<std::string(ExpressionPtr)> annotate_object =
[](auto const& /*unused*/) { return std::string{}; },
std::function<void(void)> const& note_user_context =
[]() noexcept -> void {}) const noexcept -> ExpressionPtr {
try { // try-catch to silence clang-tidy's bugprone-exception-escape,
// only imports_caller can throw but it is not called here.
auto imports_caller = [this, &functions, &annotate_object](
SubExprEvaluator&& /*eval*/,
ExpressionPtr const& expr,
Configuration const& env) {
auto name_expr = expr["name"];
auto const& name = name_expr->String();
auto it = imports_.find(name);
if (it != imports_.end()) {
std::stringstream ss{};
bool user_context = false;
auto result = it->second->Evaluate(
env,
functions,
[&ss](auto const& msg) { ss << msg; },
annotate_object,
[&user_context]() { user_context = true; }
);
if (result) {
return result;
}
if (user_context) {
throw Evaluator::EvaluationError(ss.str(), true, true);
}
throw Evaluator::EvaluationError(
fmt::format(
"This call to {} failed in the following way:\n{}",
name_expr->ToString(),
ss.str()),
true);
}
throw Evaluator::EvaluationError(
fmt::format("Unknown expression '{}'.", name));
};
auto newenv = env.Prune(vars_);
return expr_.Evaluate(
newenv,
FunctionMap::MakePtr(
functions, "CALL_EXPRESSION", imports_caller),
logger,
annotate_object,
note_user_context);
} catch (...) {
EnsuresAudit(false); // ensure that the try-block never throws
return ExpressionPtr{nullptr};
}
}
inline static Ptr const kEmptyTransition =
std::make_shared<ExpressionFunction>(
std::vector<std::string>{},
ExpressionFunction::imports_t{},
Expression::FromJson(R"([{"type": "empty_map"}])"_json));
private:
std::vector<std::string> vars_;
imports_t imports_;
ExpressionPtr expr_;
};
using ExpressionFunctionPtr = ExpressionFunction::Ptr;
} // namespace BuildMaps::Base
#endif // INCLUDED_SRC_BUILDTOOL_BUILD_ENGINE_BASE_MAPS_EXPRESSION_FUNCTION_HPP
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