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/*
* Copyright (C) 2019 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 "idmap2/XmlParser.h"
#include <iostream>
#include <map>
#include <memory>
#include <string>
#include <utility>
namespace android::idmap2 {
template <typename T>
ResXMLParser::ResXMLPosition get_tree_position(const T& tree) {
ResXMLParser::ResXMLPosition pos{};
tree.getPosition(&pos);
return pos;
}
XmlParser::Node::Node(const ResXMLTree& tree) : Node(tree, get_tree_position(tree)) {
}
XmlParser::Node::Node(const ResXMLTree& tree, const ResXMLParser::ResXMLPosition& pos)
: parser_(tree) {
set_position(pos);
}
bool XmlParser::Node::operator==(const XmlParser::Node& rhs) const {
ResXMLParser::ResXMLPosition pos = get_position();
ResXMLParser::ResXMLPosition rhs_pos = rhs.get_position();
return pos.curExt == rhs_pos.curExt && pos.curNode == rhs_pos.curNode &&
pos.eventCode == rhs_pos.eventCode;
}
bool XmlParser::Node::operator!=(const XmlParser::Node& rhs) const {
return !(*this == rhs);
}
ResXMLParser::ResXMLPosition XmlParser::Node::get_position() const {
return get_tree_position(parser_);
}
void XmlParser::Node::set_position(const ResXMLParser::ResXMLPosition& pos) {
parser_.setPosition(pos);
}
bool XmlParser::Node::Seek(bool inner_child) {
if (parser_.getEventType() == XmlParser::Event::END_TAG) {
return false;
}
ssize_t depth = 0;
XmlParser::Event code;
while ((code = parser_.next()) != XmlParser::Event::BAD_DOCUMENT &&
code != XmlParser::Event::END_DOCUMENT) {
if (code == XmlParser::Event::START_TAG) {
if (++depth == (inner_child ? 1 : 0)) {
return true;
}
} else if (code == XmlParser::Event::END_TAG) {
if (--depth == (inner_child ? -1 : -2)) {
return false;
}
}
}
return false;
}
XmlParser::Event XmlParser::Node::event() const {
return parser_.getEventType();
}
std::string XmlParser::Node::name() const {
size_t len;
const String16 key16(parser_.getElementName(&len));
return String8(key16).c_str();
}
template <typename Func>
Result<Res_value> FindAttribute(const ResXMLParser& parser, const std::string& label,
Func&& predicate) {
for (size_t i = 0; i < parser.getAttributeCount(); i++) {
if (!predicate(i)) {
continue;
}
Res_value res_value{};
if (parser.getAttributeValue(i, &res_value) == BAD_TYPE) {
return Error(R"(Bad value for attribute "%s")", label.c_str());
}
return res_value;
}
return Error(R"(Failed to find attribute "%s")", label.c_str());
}
Result<std::string> GetStringValue(const ResXMLParser& parser, const Res_value& value,
const std::string& label) {
switch (value.dataType) {
case Res_value::TYPE_STRING: {
if (auto str = parser.getStrings().string8ObjectAt(value.data); str.ok()) {
return std::string(str->c_str());
}
break;
}
case Res_value::TYPE_INT_DEC:
case Res_value::TYPE_INT_HEX:
case Res_value::TYPE_INT_BOOLEAN: {
return std::to_string(value.data);
}
}
return Error(R"(Failed to convert attribute "%s" value to a string)", label.c_str());
}
Result<Res_value> XmlParser::Node::GetAttributeValue(ResourceId attr,
const std::string& label) const {
return FindAttribute(parser_, label, [&](size_t index) -> bool {
return parser_.getAttributeNameResID(index) == attr;
});
}
Result<Res_value> XmlParser::Node::GetAttributeValue(const std::string& name) const {
return FindAttribute(parser_, name, [&](size_t index) -> bool {
size_t len;
const String16 key16(parser_.getAttributeName(index, &len));
std::string key = String8(key16).c_str();
return key == name;
});
}
Result<std::string> XmlParser::Node::GetAttributeStringValue(ResourceId attr,
const std::string& label) const {
auto value = GetAttributeValue(attr, label);
return value ? GetStringValue(parser_, *value, label) : value.GetError();
}
Result<std::string> XmlParser::Node::GetAttributeStringValue(const std::string& name) const {
auto value = GetAttributeValue(name);
return value ? GetStringValue(parser_, *value, name) : value.GetError();
}
XmlParser::XmlParser(std::unique_ptr<ResXMLTree> tree) : tree_(std::move(tree)) {
}
Result<XmlParser> XmlParser::Create(const void* data, size_t size, bool copy_data) {
auto tree = std::make_unique<ResXMLTree>();
if (tree->setTo(data, size, copy_data) != NO_ERROR) {
return Error("Malformed xml block");
}
// Find the beginning of the first tag.
XmlParser::Event event;
while ((event = tree->next()) != XmlParser::Event::BAD_DOCUMENT &&
event != XmlParser::Event::END_DOCUMENT && event != XmlParser::Event::START_TAG) {
}
if (event == XmlParser::Event::END_DOCUMENT) {
return Error("Root tag was not be found");
}
if (event == XmlParser::Event::BAD_DOCUMENT) {
return Error("Bad xml document");
}
return XmlParser{std::move(tree)};
}
} // namespace android::idmap2
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