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 "link/Linkers.h"
18
19 #include "androidfw/ResourceTypes.h"
20
21 #include "Diagnostics.h"
22 #include "ResourceUtils.h"
23 #include "SdkConstants.h"
24 #include "ValueVisitor.h"
25 #include "link/ReferenceLinker.h"
26 #include "process/IResourceTableConsumer.h"
27 #include "process/SymbolTable.h"
28 #include "trace/TraceBuffer.h"
29 #include "util/Util.h"
30 #include "xml/XmlDom.h"
31
32 namespace aapt {
33
34 namespace {
35
36 // Visits each xml Element and compiles the attributes within.
37 class XmlVisitor : public xml::PackageAwareVisitor {
38 public:
39 using xml::PackageAwareVisitor::Visit;
40
XmlVisitor(const Source & source,StringPool * pool,const CallSite & callsite,IAaptContext * context,ResourceTable * table,SymbolTable * symbols)41 XmlVisitor(const Source& source, StringPool* pool, const CallSite& callsite,
42 IAaptContext* context, ResourceTable* table, SymbolTable* symbols)
43 : source_(source),
44 callsite_(callsite),
45 context_(context),
46 symbols_(symbols),
47 reference_transformer_(callsite, context, symbols, pool, table, this) {
48 }
49
Visit(xml::Element * el)50 void Visit(xml::Element* el) override {
51 // The default Attribute allows everything except enums or flags.
52 Attribute default_attribute(android::ResTable_map::TYPE_ANY);
53 default_attribute.SetWeak(true);
54
55 // The default orientation of gradients in android Q is different than previous android
56 // versions. Set the android:angle attribute to "0" to ensure that the default gradient
57 // orientation will remain left-to-right in android Q.
58 if (el->name == "gradient" && context_->GetMinSdkVersion() <= SDK_Q) {
59 if (!el->FindAttribute(xml::kSchemaAndroid, "angle")) {
60 el->attributes.push_back(xml::Attribute{xml::kSchemaAndroid, "angle", "0"});
61 }
62 }
63
64 const Source source = source_.WithLine(el->line_number);
65 for (xml::Attribute& attr : el->attributes) {
66 // If the attribute has no namespace, interpret values as if
67 // they were assigned to the default Attribute.
68
69 const Attribute* attribute = &default_attribute;
70
71 if (std::optional<xml::ExtractedPackage> maybe_package =
72 xml::ExtractPackageFromNamespace(attr.namespace_uri)) {
73 // There is a valid package name for this attribute. We will look this up.
74 Reference attr_ref(
75 ResourceNameRef(maybe_package.value().package, ResourceType::kAttr, attr.name));
76 attr_ref.private_reference = maybe_package.value().private_namespace;
77
78 std::string err_str;
79 attr.compiled_attribute =
80 ReferenceLinker::CompileXmlAttribute(attr_ref, callsite_, context_, symbols_, &err_str);
81
82 if (!attr.compiled_attribute) {
83 DiagMessage error_msg(source);
84 error_msg << "attribute ";
85 ReferenceLinker::WriteAttributeName(attr_ref, callsite_, this, &error_msg);
86 error_msg << " " << err_str;
87 context_->GetDiagnostics()->Error(error_msg);
88 error_ = true;
89 continue;
90 }
91
92 attribute = &attr.compiled_attribute.value().attribute;
93 }
94
95 attr.compiled_value = ResourceUtils::TryParseItemForAttribute(attr.value, attribute);
96 if (attr.compiled_value) {
97 // With a compiledValue, we must resolve the reference and assign it an ID.
98 attr.compiled_value->SetSource(source);
99 attr.compiled_value = attr.compiled_value->Transform(reference_transformer_);
100 } else if ((attribute->type_mask & android::ResTable_map::TYPE_STRING) == 0) {
101 // We won't be able to encode this as a string.
102 DiagMessage msg(source);
103 msg << "'" << attr.value << "' is incompatible with attribute " << attr.name << " "
104 << *attribute;
105 context_->GetDiagnostics()->Error(msg);
106 error_ = true;
107 }
108 }
109
110 // Call the super implementation.
111 xml::PackageAwareVisitor::Visit(el);
112 }
113
HasError()114 bool HasError() {
115 return error_ || reference_transformer_.HasError();
116 }
117
118 private:
119 DISALLOW_COPY_AND_ASSIGN(XmlVisitor);
120
121 Source source_;
122 const CallSite& callsite_;
123 IAaptContext* context_;
124 SymbolTable* symbols_;
125
126 ReferenceLinkerTransformer reference_transformer_;
127 bool error_ = false;
128 };
129
130 } // namespace
131
Consume(IAaptContext * context,xml::XmlResource * resource)132 bool XmlReferenceLinker::Consume(IAaptContext* context, xml::XmlResource* resource) {
133 TRACE_NAME("XmlReferenceLinker::Consume");
134 CallSite callsite{resource->file.name.package};
135
136 std::string out_name = resource->file.name.entry;
137 NameMangler::Unmangle(&out_name, &callsite.package);
138
139 if (callsite.package.empty()) {
140 // Assume an empty package means that the XML file is local. This is true of AndroidManifest.xml
141 // for example.
142 callsite.package = context->GetCompilationPackage();
143 }
144
145 XmlVisitor visitor(resource->file.source, &resource->string_pool, callsite, context, table_,
146 context->GetExternalSymbols());
147 if (resource->root) {
148 resource->root->Accept(&visitor);
149 return !visitor.HasError();
150 }
151 return false;
152 }
153
154 } // namespace aapt
155