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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_LINKER_REFERENCELINKER_H
#define AAPT_LINKER_REFERENCELINKER_H
#include "android-base/macros.h"
#include "Resource.h"
#include "ResourceValues.h"
#include "ValueVisitor.h"
#include "link/Linkers.h"
#include "process/IResourceTableConsumer.h"
#include "process/SymbolTable.h"
#include "xml/XmlDom.h"
namespace aapt {
/**
* Resolves all references to resources in the ResourceTable and assigns them
* IDs.
* The ResourceTable must already have IDs assigned to each resource.
* Once the ResourceTable is processed by this linker, it is ready to be
* flattened.
*/
class ReferenceLinker : public IResourceTableConsumer {
public:
ReferenceLinker() = default;
/**
* Returns true if the symbol is visible by the reference and from the
* callsite.
*/
static bool IsSymbolVisible(const SymbolTable::Symbol& symbol,
const Reference& ref, const CallSite& callsite);
/**
* Performs name mangling and looks up the resource in the symbol table.
* Returns nullptr if the symbol was not found.
*/
static const SymbolTable::Symbol* ResolveSymbol(const Reference& reference, SymbolTable* symbols);
/**
* Performs name mangling and looks up the resource in the symbol table. If
* the symbol is not visible by the reference at the callsite, nullptr is
* returned. out_error holds the error message.
*/
static const SymbolTable::Symbol* ResolveSymbolCheckVisibility(const Reference& reference,
const CallSite& callsite,
SymbolTable* symbols,
std::string* out_error);
/**
* Same as resolveSymbolCheckVisibility(), but also makes sure the symbol is
* an attribute.
* That is, the return value will have a non-null value for
* ISymbolTable::Symbol::attribute.
*/
static const SymbolTable::Symbol* ResolveAttributeCheckVisibility(const Reference& reference,
const CallSite& callsite,
SymbolTable* symbols,
std::string* out_error);
/**
* Resolves the attribute reference and returns an xml::AaptAttribute if
* successful.
* If resolution fails, outError holds the error message.
*/
static Maybe<xml::AaptAttribute> CompileXmlAttribute(const Reference& reference,
const CallSite& callsite,
SymbolTable* symbols,
std::string* out_error);
/**
* Writes the resource name to the DiagMessage, using the
* "orig_name (aka <transformed_name>)" syntax.
*/
static void WriteResourceName(DiagMessage* out_msg, const Reference& orig,
const Reference& transformed);
/**
* Transforms the package name of the reference to the fully qualified package
* name using
* the xml::IPackageDeclStack, then mangles and looks up the symbol. If the
* symbol is visible
* to the reference at the callsite, the reference is updated with an ID.
* Returns false on failure, and an error message is logged to the
* IDiagnostics in the context.
*/
static bool LinkReference(const CallSite& callsite, Reference* reference, IAaptContext* context,
SymbolTable* symbols, xml::IPackageDeclStack* decls);
/**
* Links all references in the ResourceTable.
*/
bool Consume(IAaptContext* context, ResourceTable* table) override;
private:
DISALLOW_COPY_AND_ASSIGN(ReferenceLinker);
};
} // namespace aapt
#endif /* AAPT_LINKER_REFERENCELINKER_H */
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