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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.
*/
#ifndef AAPT_NAME_MANGLER_H
#define AAPT_NAME_MANGLER_H
#include <set>
#include <string>
#include "Resource.h"
namespace aapt {
struct NameManglerPolicy {
/**
* Represents the package we are trying to build. References pointing
* to this package are not mangled, and mangled references inherit this
* package name.
*/
std::string target_package_name;
/**
* We must know which references to mangle, and which to keep (android vs.
* com.android.support).
*/
std::set<std::string, std::less<>> packages_to_mangle;
};
class NameMangler {
public:
explicit NameMangler(NameManglerPolicy policy) : policy_(policy) {}
std::optional<ResourceName> MangleName(const ResourceName& name) {
if (policy_.target_package_name == name.package ||
policy_.packages_to_mangle.count(name.package) == 0) {
return {};
}
std::string mangled_entry_name = MangleEntry(name.package, name.entry);
return ResourceName(policy_.target_package_name, name.type,
mangled_entry_name);
}
bool ShouldMangle(std::string_view package) const {
if (package.empty() || policy_.target_package_name == package) {
return false;
}
return policy_.packages_to_mangle.count(package) != 0;
}
const std::string& GetTargetPackageName() const { return policy_.target_package_name; }
/**
* Returns a mangled name that is a combination of `name` and `package`.
* The mangled name should contain symbols that are illegal to define in XML,
* so that there will never be name mangling collisions.
*/
static std::string MangleEntry(std::string_view package, std::string_view name) {
return (std::string(package) += '$') += name;
}
/**
* Unmangles the name in `outName`, storing the correct name back in `outName`
* and the package in `outPackage`. Returns true if the name was unmangled or
* false if the name was never mangled to begin with.
*/
static bool Unmangle(std::string* out_name, std::string* out_package) {
size_t pivot = out_name->find('$');
if (pivot == std::string::npos) {
return false;
}
out_package->assign(out_name->data(), pivot);
std::string new_name = out_name->substr(pivot + 1);
*out_name = std::move(new_name);
return true;
}
private:
NameManglerPolicy policy_;
};
} // namespace aapt
#endif // AAPT_NAME_MANGLER_H