1 /*
2 * Copyright (C) 2016 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 <algorithm>
20
21 #include "ResourceTable.h"
22
23 namespace aapt {
24
25 namespace {
26
27 /**
28 * Visits each xml Node, removing URI references and nested namespaces.
29 */
30 class XmlVisitor : public xml::Visitor {
31 public:
XmlVisitor(bool keep_uris)32 explicit XmlVisitor(bool keep_uris) : keep_uris_(keep_uris) {}
33
Visit(xml::Element * el)34 void Visit(xml::Element* el) override {
35 // Strip namespaces
36 for (auto& child : el->children) {
37 while (child && xml::NodeCast<xml::Namespace>(child.get())) {
38 if (child->children.empty()) {
39 child = {};
40 } else {
41 child = std::move(child->children.front());
42 child->parent = el;
43 }
44 }
45 }
46 el->children.erase(
47 std::remove_if(el->children.begin(), el->children.end(),
48 [](const std::unique_ptr<xml::Node>& child) -> bool {
49 return child == nullptr;
50 }),
51 el->children.end());
52
53 if (!keep_uris_) {
54 for (xml::Attribute& attr : el->attributes) {
55 attr.namespace_uri = std::string();
56 }
57 el->namespace_uri = std::string();
58 }
59 xml::Visitor::Visit(el);
60 }
61
62 private:
63 DISALLOW_COPY_AND_ASSIGN(XmlVisitor);
64
65 bool keep_uris_;
66 };
67
68 } // namespace
69
Consume(IAaptContext * context,xml::XmlResource * resource)70 bool XmlNamespaceRemover::Consume(IAaptContext* context,
71 xml::XmlResource* resource) {
72 if (!resource->root) {
73 return false;
74 }
75 // Replace any root namespaces until the root is a non-namespace node
76 while (xml::NodeCast<xml::Namespace>(resource->root.get())) {
77 if (resource->root->children.empty()) {
78 break;
79 }
80 resource->root = std::move(resource->root->children.front());
81 resource->root->parent = nullptr;
82 }
83 XmlVisitor visitor(keep_uris_);
84 resource->root->Accept(&visitor);
85 return true;
86 }
87
88 } // namespace aapt
89