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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 "link/Linkers.h"
#include "androidfw/ResourceTypes.h"
#include "Diagnostics.h"
#include "ResourceUtils.h"
#include "SdkConstants.h"
#include "ValueVisitor.h"
#include "link/ReferenceLinker.h"
#include "process/IResourceTableConsumer.h"
#include "process/SymbolTable.h"
#include "trace/TraceBuffer.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 DescendingValueVisitor {
public:
using DescendingValueVisitor::Visit;
ReferenceVisitor(const CallSite& callsite, IAaptContext* context, SymbolTable* symbols,
xml::IPackageDeclStack* decls)
: callsite_(callsite), context_(context), symbols_(symbols), decls_(decls), error_(false) {}
void Visit(Reference* ref) override {
if (!ReferenceLinker::LinkReference(callsite_, ref, context_, symbols_, decls_)) {
error_ = true;
}
}
bool HasError() const {
return error_;
}
private:
DISALLOW_COPY_AND_ASSIGN(ReferenceVisitor);
const CallSite& callsite_;
IAaptContext* context_;
SymbolTable* symbols_;
xml::IPackageDeclStack* decls_;
bool error_;
};
// Visits each xml Element and compiles the attributes within.
class XmlVisitor : public xml::PackageAwareVisitor {
public:
using xml::PackageAwareVisitor::Visit;
XmlVisitor(const Source& source, const CallSite& callsite, IAaptContext* context,
SymbolTable* symbols)
: source_(source),
callsite_(callsite),
context_(context),
symbols_(symbols),
reference_visitor_(callsite, context, symbols, this) {
}
void Visit(xml::Element* el) override {
// The default Attribute allows everything except enums or flags.
Attribute default_attribute(android::ResTable_map::TYPE_ANY);
default_attribute.SetWeak(true);
const Source source = source_.WithLine(el->line_number);
for (xml::Attribute& attr : el->attributes) {
// If the attribute has no namespace, interpret values as if
// they were assigned to the default Attribute.
const Attribute* attribute = &default_attribute;
if (Maybe<xml::ExtractedPackage> maybe_package =
xml::ExtractPackageFromNamespace(attr.namespace_uri)) {
// There is a valid package name for this attribute. We will look this up.
Reference attr_ref(
ResourceNameRef(maybe_package.value().package, ResourceType::kAttr, attr.name));
attr_ref.private_reference = maybe_package.value().private_namespace;
std::string err_str;
attr.compiled_attribute =
ReferenceLinker::CompileXmlAttribute(attr_ref, callsite_, symbols_, &err_str);
if (!attr.compiled_attribute) {
DiagMessage error_msg(source);
error_msg << "attribute ";
ReferenceLinker::WriteAttributeName(attr_ref, callsite_, this, &error_msg);
error_msg << " " << err_str;
context_->GetDiagnostics()->Error(error_msg);
error_ = true;
continue;
}
attribute = &attr.compiled_attribute.value().attribute;
}
attr.compiled_value = ResourceUtils::TryParseItemForAttribute(attr.value, attribute);
if (attr.compiled_value) {
// With a compiledValue, we must resolve the reference and assign it an ID.
attr.compiled_value->SetSource(source);
attr.compiled_value->Accept(&reference_visitor_);
} else if ((attribute->type_mask & android::ResTable_map::TYPE_STRING) == 0) {
// We won't be able to encode this as a string.
DiagMessage msg(source);
msg << "'" << attr.value << "' is incompatible with attribute " << attr.name << " "
<< *attribute;
context_->GetDiagnostics()->Error(msg);
error_ = true;
}
}
// Call the super implementation.
xml::PackageAwareVisitor::Visit(el);
}
bool HasError() {
return error_ || reference_visitor_.HasError();
}
private:
DISALLOW_COPY_AND_ASSIGN(XmlVisitor);
Source source_;
const CallSite& callsite_;
IAaptContext* context_;
SymbolTable* symbols_;
ReferenceVisitor reference_visitor_;
bool error_ = false;
};
} // namespace
bool XmlReferenceLinker::Consume(IAaptContext* context, xml::XmlResource* resource) {
TRACE_NAME("XmlReferenceLinker::Consume");
CallSite callsite{resource->file.name.package};
std::string out_name = resource->file.name.entry;
NameMangler::Unmangle(&out_name, &callsite.package);
if (callsite.package.empty()) {
// Assume an empty package means that the XML file is local. This is true of AndroidManifest.xml
// for example.
callsite.package = context->GetCompilationPackage();
}
XmlVisitor visitor(resource->file.source, callsite, context, context->GetExternalSymbols());
if (resource->root) {
resource->root->Accept(&visitor);
return !visitor.HasError();
}
return false;
}
} // namespace aapt
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