Helper.hpp

/*
 * Tencent is pleased to support the open source community by making ScriptX available.
 * Copyright (C) 2021 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * 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.
 */

#pragma once
#include <utility>
#include <vector>
#include "../Reference.h"
#include "../foundation.h"

namespace script::internal {

namespace detail {

template <typename T, size_t N, typename FN>
bool withNArrayHelper(FN&& fn) {
  T array[N];
  fn(array);
  return true;
}

constexpr size_t powOf2(size_t n) { return n == 0 ? 1 : powOf2(n - 1) * 2; }

template <typename T, typename FN, size_t... I>
void withNArrayHelper2(FN&& fn, size_t n, std::index_sequence<I...>) {
  (... ||
   (n <= detail::powOf2(I) && withNArrayHelper<T, detail::powOf2(I), FN>(std::forward<FN>(fn))));
}

}  // namespace detail

template <typename T, typename FN>
void withNArray(size_t N, FN&& fn) {
  constexpr size_t kMax = 6;
  if (N < detail::powOf2(kMax)) {
    detail::withNArrayHelper2<T>(std::forward<FN>(fn), N, std::make_index_sequence<kMax + 1>());
  } else {
    std::vector<T> array(N);
    fn(array.data());
  }
}

Local<Value> getNamespaceObject(ScriptEngine* engine, const std::string_view& nameSpace,
                                Local<Value> rootNs = {});

Local<Value> readAllFileContent(const Local<String>& scriptFile);
}  // namespace script::internal