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/*
* Copyright (C) 2018 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.
*/
#ifndef DEX_LAYOUT_COMPILER_H_
#define DEX_LAYOUT_COMPILER_H_
#include "dex_builder.h"
#include <codecvt>
#include <locale>
#include <string>
#include <vector>
namespace startop {
// This visitor does the actual view compilation, using a supplied builder.
template <typename Builder>
class LayoutCompilerVisitor {
public:
explicit LayoutCompilerVisitor(Builder* builder) : builder_{builder} {}
void VisitStartDocument() { builder_->Start(); }
void VisitEndDocument() { builder_->Finish(); }
void VisitStartTag(const std::u16string& name) {
parent_stack_.push_back(ViewEntry{
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.to_bytes(name), {}});
}
void VisitEndTag() {
auto entry = parent_stack_.back();
parent_stack_.pop_back();
if (parent_stack_.empty()) {
GenerateCode(entry);
} else {
parent_stack_.back().children.push_back(entry);
}
}
private:
struct ViewEntry {
std::string name;
std::vector<ViewEntry> children;
};
void GenerateCode(const ViewEntry& view) {
builder_->StartView(view.name, !view.children.empty());
for (const auto& child : view.children) {
GenerateCode(child);
}
builder_->FinishView();
}
Builder* builder_;
std::vector<ViewEntry> parent_stack_;
};
class DexViewBuilder {
public:
DexViewBuilder(dex::MethodBuilder* method);
void Start();
void Finish();
void StartView(const std::string& name, bool is_viewgroup);
void FinishView();
private:
// Accessors for the stack of views that are under construction.
dex::Value AcquireRegister();
void ReleaseRegister();
dex::Value GetCurrentView() const;
dex::Value GetCurrentLayoutParams() const;
dex::Value GetParentView() const;
void PopViewStack();
dex::MethodBuilder* method_;
// Registers used for code generation
dex::Value const context_;
dex::Value const resid_;
const dex::Value inflater_;
const dex::Value xml_;
const dex::Value attrs_;
const dex::Value classname_tmp_;
const dex::MethodDeclData xml_next_;
const dex::MethodDeclData try_create_view_;
const dex::MethodDeclData generate_layout_params_;
const dex::MethodDeclData add_view_;
// used for keeping track of which registers are in use
size_t top_register_{0};
std::vector<dex::Value> register_stack_;
// Keep track of the views currently in progress.
struct ViewEntry {
dex::Value view;
std::optional<dex::Value> layout_params;
};
std::vector<ViewEntry> view_stack_;
};
} // namespace startop
#endif // DEX_LAYOUT_COMPILER_H_
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