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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 "Diagnostics.h"
#include "ResourceUtils.h"
#include "SdkConstants.h"
#include "link/Linkers.h"
#include "link/ReferenceLinker.h"
#include "process/IResourceTableConsumer.h"
#include "process/SymbolTable.h"
#include "util/Util.h"
#include "xml/XmlDom.h"
namespace aapt {
namespace {
/**
* Visits all references (including parents of styles, references in styles, arrays, etc) and
* links their symbolic name to their Resource ID, performing mangling and package aliasing
* as needed.
*/
class ReferenceVisitor : public ValueVisitor {
public:
using ValueVisitor::visit;
ReferenceVisitor(IAaptContext* context, SymbolTable* symbols, xml::IPackageDeclStack* decls,
CallSite* callSite) :
mContext(context), mSymbols(symbols), mDecls(decls), mCallSite(callSite),
mError(false) {
}
void visit(Reference* ref) override {
if (!ReferenceLinker::linkReference(ref, mContext, mSymbols, mDecls, mCallSite)) {
mError = true;
}
}
bool hasError() const {
return mError;
}
private:
IAaptContext* mContext;
SymbolTable* mSymbols;
xml::IPackageDeclStack* mDecls;
CallSite* mCallSite;
bool mError;
};
/**
* Visits each xml Element and compiles the attributes within.
*/
class XmlVisitor : public xml::PackageAwareVisitor {
public:
using xml::PackageAwareVisitor::visit;
XmlVisitor(IAaptContext* context, SymbolTable* symbols, const Source& source,
std::set<int>* sdkLevelsFound, CallSite* callSite) :
mContext(context), mSymbols(symbols), mSource(source), mSdkLevelsFound(sdkLevelsFound),
mCallSite(callSite), mReferenceVisitor(context, symbols, this, callSite) {
}
void visit(xml::Element* el) override {
const Source source = mSource.withLine(el->lineNumber);
for (xml::Attribute& attr : el->attributes) {
Maybe<xml::ExtractedPackage> maybePackage =
xml::extractPackageFromNamespace(attr.namespaceUri);
if (maybePackage) {
// There is a valid package name for this attribute. We will look this up.
StringPiece16 package = maybePackage.value().package;
if (package.empty()) {
// Empty package means the 'current' or 'local' package.
package = mContext->getCompilationPackage();
}
Reference attrRef(ResourceNameRef(package, ResourceType::kAttr, attr.name));
attrRef.privateReference = maybePackage.value().privateNamespace;
std::string errStr;
attr.compiledAttribute = ReferenceLinker::compileXmlAttribute(
attrRef, mContext->getNameMangler(), mSymbols, mCallSite, &errStr);
// Convert the string value into a compiled Value if this is a valid attribute.
if (attr.compiledAttribute) {
if (attr.compiledAttribute.value().id) {
// Record all SDK levels from which the attributes were defined.
const size_t sdkLevel = findAttributeSdkLevel(
attr.compiledAttribute.value().id.value());
if (sdkLevel > 1) {
mSdkLevelsFound->insert(sdkLevel);
}
}
const Attribute* attribute = &attr.compiledAttribute.value().attribute;
attr.compiledValue = ResourceUtils::parseItemForAttribute(attr.value,
attribute);
if (!attr.compiledValue &&
!(attribute->typeMask & android::ResTable_map::TYPE_STRING)) {
// We won't be able to encode this as a string.
mContext->getDiagnostics()->error(
DiagMessage(source) << "'" << attr.value << "' "
<< "is incompatible with attribute "
<< package << ":" << attr.name << " "
<< *attribute);
mError = true;
}
} else {
mContext->getDiagnostics()->error(DiagMessage(source)
<< "attribute '" << package << ":"
<< attr.name << "' " << errStr);
mError = true;
}
} else {
// We still encode references.
attr.compiledValue = ResourceUtils::tryParseReference(attr.value);
}
if (attr.compiledValue) {
// With a compiledValue, we must resolve the reference and assign it an ID.
attr.compiledValue->setSource(source);
attr.compiledValue->accept(&mReferenceVisitor);
}
}
// Call the super implementation.
xml::PackageAwareVisitor::visit(el);
}
bool hasError() {
return mError || mReferenceVisitor.hasError();
}
private:
IAaptContext* mContext;
SymbolTable* mSymbols;
Source mSource;
std::set<int>* mSdkLevelsFound;
CallSite* mCallSite;
ReferenceVisitor mReferenceVisitor;
bool mError = false;
};
} // namespace
bool XmlReferenceLinker::consume(IAaptContext* context, xml::XmlResource* resource) {
mSdkLevelsFound.clear();
CallSite callSite = { resource->file.name };
XmlVisitor visitor(context, context->getExternalSymbols(), resource->file.source,
&mSdkLevelsFound, &callSite);
if (resource->root) {
resource->root->accept(&visitor);
return !visitor.hasError();
}
return false;
}
} // namespace aapt
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