tools/aapt2/link/PrivateAttributeMover.cpp

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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 "ResourceTable.h"
#include "link/Linkers.h"

#include <algorithm>
#include <iterator>

namespace aapt {

template <typename InputContainer, typename OutputIterator, typename Predicate>
OutputIterator moveIf(InputContainer& inputContainer, OutputIterator result,
                      Predicate pred) {
  const auto last = inputContainer.end();
  auto newEnd =
      std::find_if(inputContainer.begin(), inputContainer.end(), pred);
  if (newEnd == last) {
    return result;
  }

  *result = std::move(*newEnd);

  auto first = newEnd;
  ++first;

  for (; first != last; ++first) {
    if (bool(pred(*first))) {
      // We want to move this guy
      *result = std::move(*first);
      ++result;
    } else {
      // We want to keep this guy, but we will need to move it up the list to
      // replace
      // missing items.
      *newEnd = std::move(*first);
      ++newEnd;
    }
  }

  inputContainer.erase(newEnd, last);
  return result;
}

bool PrivateAttributeMover::consume(IAaptContext* context,
                                    ResourceTable* table) {
  for (auto& package : table->packages) {
    ResourceTableType* type = package->findType(ResourceType::kAttr);
    if (!type) {
      continue;
    }

    if (type->symbolStatus.state != SymbolState::kPublic) {
      // No public attributes, so we can safely leave these private attributes
      // where they are.
      return true;
    }

    ResourceTableType* privAttrType =
        package->findOrCreateType(ResourceType::kAttrPrivate);
    assert(privAttrType->entries.empty());

    moveIf(type->entries, std::back_inserter(privAttrType->entries),
           [](const std::unique_ptr<ResourceEntry>& entry) -> bool {
             return entry->symbolStatus.state != SymbolState::kPublic;
           });
    break;
  }
  return true;
}

}  // namespace aapt