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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 "Resource.h"
#include "util/Maybe.h"
#include <set>
#include <string>
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::u16string targetPackageName;
/**
* We must know which references to mangle, and which to keep (android vs. com.android.support).
*/
std::set<std::u16string> packagesToMangle;
};
class NameMangler {
private:
NameManglerPolicy mPolicy;
public:
NameMangler(NameManglerPolicy policy) : mPolicy(policy) {
}
Maybe<ResourceName> mangleName(const ResourceName& name) {
if (mPolicy.targetPackageName == name.package ||
mPolicy.packagesToMangle.count(name.package) == 0) {
return {};
}
return ResourceName{
mPolicy.targetPackageName,
name.type,
mangleEntry(name.package, name.entry)
};
}
bool shouldMangle(const std::u16string& package) const {
if (package.empty() || mPolicy.targetPackageName == package) {
return false;
}
return mPolicy.packagesToMangle.count(package) != 0;
}
/**
* 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::u16string mangleEntry(const std::u16string& package, const std::u16string& name) {
return package + u"$" + name;
}
/**
* Unmangles the name in `outName`, storing the correct name back in `outName`
* and the package in `outPackage`. Returns true if the name was unmangled or
* false if the name was never mangled to begin with.
*/
static bool unmangle(std::u16string* outName, std::u16string* outPackage) {
size_t pivot = outName->find(u'$');
if (pivot == std::string::npos) {
return false;
}
outPackage->assign(outName->data(), pivot);
outName->assign(outName->data() + pivot + 1, outName->size() - (pivot + 1));
return true;
}
};
} // namespace aapt
#endif // AAPT_NAME_MANGLER_H
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