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/*
* Copyright (C) 2016 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 "compile/InlineXmlFormatParser.h"
#include <string>
#include "ResourceUtils.h"
#include "util/Util.h"
#include "xml/XmlDom.h"
#include "xml/XmlUtil.h"
namespace aapt {
namespace {
struct InlineDeclaration {
xml::Element* el;
std::string attr_namespace_uri;
std::string attr_name;
};
// XML Visitor that will find all <aapt:attr> elements for extraction.
class Visitor : public xml::PackageAwareVisitor {
public:
using xml::PackageAwareVisitor::Visit;
explicit Visitor(IAaptContext* context, xml::XmlResource* xml_resource)
: context_(context), xml_resource_(xml_resource) {}
void Visit(xml::Element* el) override {
if (el->namespace_uri != xml::kSchemaAapt || el->name != "attr") {
xml::PackageAwareVisitor::Visit(el);
return;
}
const Source src = xml_resource_->file.source.WithLine(el->line_number);
xml::Attribute* attr = el->FindAttribute({}, "name");
if (!attr) {
context_->GetDiagnostics()->Error(DiagMessage(src) << "missing 'name' attribute");
error_ = true;
return;
}
Maybe<Reference> ref = ResourceUtils::ParseXmlAttributeName(attr->value);
if (!ref) {
context_->GetDiagnostics()->Error(DiagMessage(src) << "invalid XML attribute '" << attr->value
<< "'");
error_ = true;
return;
}
const ResourceName& name = ref.value().name.value();
Maybe<xml::ExtractedPackage> maybe_pkg = TransformPackageAlias(name.package);
if (!maybe_pkg) {
context_->GetDiagnostics()->Error(DiagMessage(src)
<< "invalid namespace prefix '" << name.package << "'");
error_ = true;
return;
}
const xml::ExtractedPackage& pkg = maybe_pkg.value();
const bool private_namespace = pkg.private_namespace || ref.value().private_reference;
InlineDeclaration decl;
decl.el = el;
decl.attr_name = name.entry;
// We need to differentiate between no-namespace defined, or the alias resolves to an empty
// package, which means we must use the res-auto schema.
if (!name.package.empty()) {
if (pkg.package.empty()) {
decl.attr_namespace_uri = xml::kSchemaAuto;
} else {
decl.attr_namespace_uri = xml::BuildPackageNamespace(pkg.package, private_namespace);
}
}
inline_declarations_.push_back(std::move(decl));
}
const std::vector<InlineDeclaration>& GetInlineDeclarations() const {
return inline_declarations_;
}
bool HasError() const {
return error_;
}
private:
DISALLOW_COPY_AND_ASSIGN(Visitor);
IAaptContext* context_;
xml::XmlResource* xml_resource_;
std::vector<InlineDeclaration> inline_declarations_;
bool error_ = false;
};
} // namespace
bool InlineXmlFormatParser::Consume(IAaptContext* context, xml::XmlResource* doc) {
Visitor visitor(context, doc);
doc->root->Accept(&visitor);
if (visitor.HasError()) {
return false;
}
size_t name_suffix_counter = 0;
for (const InlineDeclaration& decl : visitor.GetInlineDeclarations()) {
// Create a new XmlResource with the same ResourceFile as the base XmlResource.
auto new_doc = util::make_unique<xml::XmlResource>(doc->file);
// Attach the line number.
new_doc->file.source.line = decl.el->line_number;
// Modify the new entry name. We need to suffix the entry with a number to
// avoid local collisions, then mangle it with the empty package, such that it won't show up
// in R.java.
new_doc->file.name.entry = NameMangler::MangleEntry(
{}, new_doc->file.name.entry + "__" + std::to_string(name_suffix_counter));
// Extracted elements must be the only child of <aapt:attr>.
// Make sure there is one root node in the children (ignore empty text).
for (std::unique_ptr<xml::Node>& child : decl.el->children) {
const Source child_source = doc->file.source.WithLine(child->line_number);
if (xml::Text* t = xml::NodeCast<xml::Text>(child.get())) {
if (!util::TrimWhitespace(t->text).empty()) {
context->GetDiagnostics()->Error(DiagMessage(child_source)
<< "can't extract text into its own resource");
return false;
}
} else if (new_doc->root) {
context->GetDiagnostics()->Error(DiagMessage(child_source)
<< "inline XML resources must have a single root");
return false;
} else {
new_doc->root.reset(static_cast<xml::Element*>(child.release()));
new_doc->root->parent = nullptr;
// Copy down the namespace declarations
new_doc->root->namespace_decls = doc->root->namespace_decls;
// Recurse for nested inlines
Consume(context, new_doc.get());
}
}
// Get the parent element of <aapt:attr>
xml::Element* parent_el = decl.el->parent;
if (!parent_el) {
context->GetDiagnostics()->Error(DiagMessage(new_doc->file.source)
<< "no suitable parent for inheriting attribute");
return false;
}
// Add the inline attribute to the parent.
parent_el->attributes.push_back(xml::Attribute{decl.attr_namespace_uri, decl.attr_name,
"@" + new_doc->file.name.to_string()});
// Delete the subtree.
for (auto iter = parent_el->children.begin(); iter != parent_el->children.end(); ++iter) {
if (iter->get() == decl.el) {
parent_el->children.erase(iter);
break;
}
}
queue_.push_back(std::move(new_doc));
name_suffix_counter++;
}
return true;
}
} // namespace aapt
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