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/*
* Copyright (C) 2025 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 "link/FlaggedXmlVersioner.h"
#include "SdkConstants.h"
#include "androidfw/Util.h"
using ::aapt::xml::Element;
using ::aapt::xml::NodeCast;
namespace aapt {
// An xml visitor that goes through the a doc and removes any elements that are behind non-negated
// flags. It also removes the featureFlag attribute from elements behind negated flags.
class AllDisabledFlagsVisitor : public xml::Visitor {
public:
void Visit(xml::Element* node) override {
std::erase_if(node->children, [this](const std::unique_ptr<xml::Node>& node) {
return FixupOrShouldRemove(node);
});
VisitChildren(node);
}
private:
bool FixupOrShouldRemove(const std::unique_ptr<xml::Node>& node) {
if (auto* el = NodeCast<Element>(node.get())) {
auto* attr = el->FindAttribute(xml::kSchemaAndroid, xml::kAttrFeatureFlag);
if (attr == nullptr) {
return false;
}
// This class assumes all flags are disabled so we want to remove any elements behind flags
// unless the flag specification is negated. In the negated case we remove the featureFlag
// attribute because we have already determined whether we are keeping the element or not.
std::string_view flag_name = util::TrimWhitespace(attr->value);
if (flag_name.starts_with('!')) {
el->RemoveAttribute(xml::kSchemaAndroid, xml::kAttrFeatureFlag);
return false;
} else {
return true;
}
}
return false;
}
};
std::vector<std::unique_ptr<xml::XmlResource>> FlaggedXmlVersioner::Process(IAaptContext* context,
xml::XmlResource* doc) {
std::vector<std::unique_ptr<xml::XmlResource>> docs;
if (!doc->file.uses_readwrite_feature_flags) {
docs.push_back(doc->Clone());
} else if ((static_cast<ApiVersion>(doc->file.config.sdkVersion) >= SDK_BAKLAVA) ||
(static_cast<ApiVersion>(context->GetMinSdkVersion()) >= SDK_BAKLAVA)) {
// Support for read/write flags was added in baklava so if the doc will only get used on
// baklava or later we can just return the original doc.
docs.push_back(doc->Clone());
} else {
auto preBaklavaVersion = doc->Clone();
AllDisabledFlagsVisitor visitor;
preBaklavaVersion->root->Accept(&visitor);
docs.push_back(std::move(preBaklavaVersion));
auto baklavaVersion = doc->Clone();
baklavaVersion->file.config.sdkVersion = SDK_BAKLAVA;
docs.push_back(std::move(baklavaVersion));
}
return docs;
}
} // namespace aapt
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