1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "ResourceUtils.h"
18 #include "SdkConstants.h"
19 #include "ValueVisitor.h"
20 #include "androidfw/IDiagnostics.h"
21 #include "androidfw/ResourceTypes.h"
22 #include "link/Linkers.h"
23 #include "link/ReferenceLinker.h"
24 #include "process/IResourceTableConsumer.h"
25 #include "process/SymbolTable.h"
26 #include "trace/TraceBuffer.h"
27 #include "util/Util.h"
28 #include "xml/XmlDom.h"
29
30 namespace aapt {
31
32 namespace {
33
34 // Visits each xml Element and compiles the attributes within.
35 class XmlVisitor : public xml::PackageAwareVisitor {
36 public:
37 using xml::PackageAwareVisitor::Visit;
38
XmlVisitor(const android::Source & source,android::StringPool * pool,const CallSite & callsite,IAaptContext * context,ResourceTable * table,SymbolTable * symbols)39 XmlVisitor(const android::Source& source, android::StringPool* pool, const CallSite& callsite,
40 IAaptContext* context, ResourceTable* table, SymbolTable* symbols)
41 : source_(source),
42 callsite_(callsite),
43 context_(context),
44 symbols_(symbols),
45 reference_transformer_(callsite, context, symbols, pool, table, this) {
46 }
47
Visit(xml::Element * el)48 void Visit(xml::Element* el) override {
49 // The default Attribute allows everything except enums or flags.
50 Attribute default_attribute(android::ResTable_map::TYPE_ANY);
51 default_attribute.SetWeak(true);
52
53 // The default orientation of gradients in android Q is different than previous android
54 // versions. Set the android:angle attribute to "0" to ensure that the default gradient
55 // orientation will remain left-to-right in android Q.
56 if (el->name == "gradient" && context_->GetMinSdkVersion() <= SDK_Q) {
57 if (!el->FindAttribute(xml::kSchemaAndroid, "angle")) {
58 el->attributes.push_back(xml::Attribute{xml::kSchemaAndroid, "angle", "0"});
59 }
60 }
61
62 const android::Source source = source_.WithLine(el->line_number);
63 for (xml::Attribute& attr : el->attributes) {
64 // If the attribute has no namespace, interpret values as if
65 // they were assigned to the default Attribute.
66
67 const Attribute* attribute = &default_attribute;
68
69 if (std::optional<xml::ExtractedPackage> maybe_package =
70 xml::ExtractPackageFromNamespace(attr.namespace_uri)) {
71 // There is a valid package name for this attribute. We will look this up.
72 Reference attr_ref(
73 ResourceNameRef(maybe_package.value().package, ResourceType::kAttr, attr.name));
74 attr_ref.private_reference = maybe_package.value().private_namespace;
75
76 std::string err_str;
77 attr.compiled_attribute =
78 ReferenceLinker::CompileXmlAttribute(attr_ref, callsite_, context_, symbols_, &err_str);
79
80 if (!attr.compiled_attribute) {
81 android::DiagMessage error_msg(source);
82 error_msg << "attribute ";
83 ReferenceLinker::WriteAttributeName(attr_ref, callsite_, this, &error_msg);
84 error_msg << " " << err_str;
85 context_->GetDiagnostics()->Error(error_msg);
86 error_ = true;
87 continue;
88 }
89
90 attribute = &attr.compiled_attribute.value().attribute;
91 }
92
93 attr.compiled_value = ResourceUtils::TryParseItemForAttribute(context_->GetDiagnostics(),
94 attr.value, attribute);
95 if (attr.compiled_value) {
96 // With a compiledValue, we must resolve the reference and assign it an ID.
97 attr.compiled_value->SetSource(source);
98 attr.compiled_value = attr.compiled_value->Transform(reference_transformer_);
99 } else if ((attribute->type_mask & android::ResTable_map::TYPE_STRING) == 0) {
100 // We won't be able to encode this as a string.
101 android::DiagMessage msg(source);
102 msg << "'" << attr.value << "' is incompatible with attribute " << attr.name << " "
103 << *attribute;
104 context_->GetDiagnostics()->Error(msg);
105 error_ = true;
106 }
107 }
108
109 // Call the super implementation.
110 xml::PackageAwareVisitor::Visit(el);
111 }
112
HasError()113 bool HasError() {
114 return error_ || reference_transformer_.HasError();
115 }
116
117 private:
118 DISALLOW_COPY_AND_ASSIGN(XmlVisitor);
119
120 android::Source source_;
121 const CallSite& callsite_;
122 IAaptContext* context_;
123 SymbolTable* symbols_;
124
125 ReferenceLinkerTransformer reference_transformer_;
126 bool error_ = false;
127 };
128
129 } // namespace
130
Consume(IAaptContext * context,xml::XmlResource * resource)131 bool XmlReferenceLinker::Consume(IAaptContext* context, xml::XmlResource* resource) {
132 TRACE_NAME("XmlReferenceLinker::Consume");
133 CallSite callsite{resource->file.name.package};
134
135 std::string out_name = resource->file.name.entry;
136 NameMangler::Unmangle(&out_name, &callsite.package);
137
138 if (callsite.package.empty()) {
139 // Assume an empty package means that the XML file is local. This is true of AndroidManifest.xml
140 // for example.
141 callsite.package = context->GetCompilationPackage();
142 }
143
144 XmlVisitor visitor(resource->file.source, &resource->string_pool, callsite, context, table_,
145 context->GetExternalSymbols());
146 if (resource->root) {
147 resource->root->Accept(&visitor);
148 return !visitor.HasError();
149 }
150 return false;
151 }
152
153 } // namespace aapt
154