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/*
* 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 "ConfigDescription.h"
#include "ResourceTable.h"
#include "SdkConstants.h"
#include "ValueVisitor.h"
#include "link/Linkers.h"
#include <algorithm>
#include <cassert>
namespace aapt {
bool shouldGenerateVersionedResource(const ResourceEntry* entry, const ConfigDescription& config,
const int sdkVersionToGenerate) {
assert(sdkVersionToGenerate > config.sdkVersion);
const auto endIter = entry->values.end();
auto iter = entry->values.begin();
for (; iter != endIter; ++iter) {
if ((*iter)->config == config) {
break;
}
}
// The source config came from this list, so it should be here.
assert(iter != entry->values.end());
++iter;
// The next configuration either only varies in sdkVersion, or it is completely different
// and therefore incompatible. If it is incompatible, we must generate the versioned resource.
// NOTE: The ordering of configurations takes sdkVersion as higher precedence than other
// qualifiers, so we need to iterate through the entire list to be sure there
// are no higher sdk level versions of this resource.
ConfigDescription tempConfig(config);
for (; iter != endIter; ++iter) {
tempConfig.sdkVersion = (*iter)->config.sdkVersion;
if (tempConfig == (*iter)->config) {
// The two configs are the same, check the sdk version.
return sdkVersionToGenerate < (*iter)->config.sdkVersion;
}
}
// No match was found, so we should generate the versioned resource.
return true;
}
bool AutoVersioner::consume(IAaptContext* context, ResourceTable* table) {
for (auto& package : table->packages) {
for (auto& type : package->types) {
if (type->type != ResourceType::kStyle) {
continue;
}
for (auto& entry : type->entries) {
for (size_t i = 0; i < entry->values.size(); i++) {
ResourceConfigValue* configValue = entry->values[i].get();
if (configValue->config.sdkVersion >= SDK_LOLLIPOP_MR1) {
// If this configuration is only used on L-MR1 then we don't need
// to do anything since we use private attributes since that version.
continue;
}
if (Style* style = valueCast<Style>(configValue->value.get())) {
Maybe<size_t> minSdkStripped;
std::vector<Style::Entry> stripped;
auto iter = style->entries.begin();
while (iter != style->entries.end()) {
assert(iter->key.id && "IDs must be assigned and linked");
// Find the SDK level that is higher than the configuration allows.
const size_t sdkLevel = findAttributeSdkLevel(iter->key.id.value());
if (sdkLevel > std::max<size_t>(configValue->config.sdkVersion, 1)) {
// Record that we are about to strip this.
stripped.emplace_back(std::move(*iter));
// We use the smallest SDK level to generate the new style.
if (minSdkStripped) {
minSdkStripped = std::min(minSdkStripped.value(), sdkLevel);
} else {
minSdkStripped = sdkLevel;
}
// Erase this from this style.
iter = style->entries.erase(iter);
continue;
}
++iter;
}
if (minSdkStripped && !stripped.empty()) {
// We found attributes from a higher SDK level. Check that
// there is no other defined resource for the version we want to
// generate.
if (shouldGenerateVersionedResource(entry.get(),
configValue->config,
minSdkStripped.value())) {
// Let's create a new Style for this versioned resource.
ConfigDescription newConfig(configValue->config);
newConfig.sdkVersion = minSdkStripped.value();
std::unique_ptr<Style> newStyle(style->clone(&table->stringPool));
newStyle->setComment(style->getComment());
newStyle->setSource(style->getSource());
// Move the previously stripped attributes into this style.
newStyle->entries.insert(newStyle->entries.end(),
std::make_move_iterator(stripped.begin()),
std::make_move_iterator(stripped.end()));
// Insert the new Resource into the correct place.
entry->findOrCreateValue(newConfig, {})->value =
std::move(newStyle);
}
}
}
}
}
}
}
return true;
}
} // namespace aapt
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