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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 "xml/XmlActionExecutor.h"
using ::android::StringPiece;
namespace aapt {
namespace xml {
static bool wrapper_one(const XmlNodeAction::ActionFunc& f, Element* el,
const XmlActionExecutorPolicy& policy, SourcePathDiagnostics*) {
return f(el);
}
static bool wrapper_two(const XmlNodeAction::ActionFuncWithDiag& f, Element* el,
const XmlActionExecutorPolicy& policy, SourcePathDiagnostics* diag) {
return f(el, diag);
}
static bool wrapper_three(const XmlNodeAction::ActionFuncWithPolicyAndDiag& f, Element* el,
const XmlActionExecutorPolicy& policy, SourcePathDiagnostics* diag) {
return f(el, policy, diag);
}
void XmlNodeAction::Action(XmlNodeAction::ActionFunc f) {
actions_.emplace_back(std::bind(wrapper_one, std::move(f), std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3));
}
void XmlNodeAction::Action(XmlNodeAction::ActionFuncWithDiag f) {
actions_.emplace_back(std::bind(wrapper_two, std::move(f), std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3));
}
void XmlNodeAction::Action(XmlNodeAction::ActionFuncWithPolicyAndDiag f) {
actions_.emplace_back(std::bind(wrapper_three, std::move(f), std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3));
}
static void PrintElementToDiagMessage(const Element* el, DiagMessage* msg) {
*msg << "<";
if (!el->namespace_uri.empty()) {
*msg << el->namespace_uri << ":";
}
*msg << el->name << ">";
}
bool XmlNodeAction::Execute(XmlActionExecutorPolicy policy, std::vector<StringPiece>* bread_crumb,
SourcePathDiagnostics* diag, Element* el) const {
bool error = false;
for (const ActionFuncWithPolicyAndDiag& action : actions_) {
error |= !action(el, policy, diag);
}
for (Element* child_el : el->GetChildElements()) {
if (child_el->namespace_uri.empty()) {
std::map<std::string, XmlNodeAction>::const_iterator iter = map_.find(child_el->name);
if (iter != map_.end()) {
// Use the iterator's copy of the element name, because the element may be modified.
bread_crumb->push_back(iter->first);
error |= !iter->second.Execute(policy, bread_crumb, diag, child_el);
bread_crumb->pop_back();
continue;
}
if (policy != XmlActionExecutorPolicy::kNone) {
DiagMessage error_msg(child_el->line_number);
error_msg << "unexpected element ";
PrintElementToDiagMessage(child_el, &error_msg);
error_msg << " found in ";
for (const StringPiece& element : *bread_crumb) {
error_msg << "<" << element << ">";
}
if (policy == XmlActionExecutorPolicy::kAllowListWarning) {
// Treat the error only as a warning.
diag->Warn(error_msg);
} else {
// Policy is XmlActionExecutorPolicy::kAllowList, we should fail.
diag->Error(error_msg);
error = true;
}
}
}
}
return !error;
}
bool XmlActionExecutor::Execute(XmlActionExecutorPolicy policy, IDiagnostics* diag,
XmlResource* doc) const {
SourcePathDiagnostics source_diag(doc->file.source, diag);
Element* el = doc->root.get();
if (!el) {
if (policy == XmlActionExecutorPolicy::kAllowList) {
source_diag.Error(DiagMessage() << "no root XML tag found");
return false;
}
return true;
}
if (el->namespace_uri.empty()) {
std::map<std::string, XmlNodeAction>::const_iterator iter = map_.find(el->name);
if (iter != map_.end()) {
std::vector<StringPiece> bread_crumb;
bread_crumb.push_back(iter->first);
return iter->second.Execute(policy, &bread_crumb, &source_diag, el);
}
if (policy == XmlActionExecutorPolicy::kAllowList) {
DiagMessage error_msg(el->line_number);
error_msg << "unexpected root element ";
PrintElementToDiagMessage(el, &error_msg);
source_diag.Error(error_msg);
return false;
}
}
return true;
}
} // namespace xml
} // namespace aapt
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