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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.
*/
#include "gflags/gflags.h"
#include "android-base/stringprintf.h"
#include "dex_builder.h"
#include "dex_layout_compiler.h"
#include "java_lang_builder.h"
#include "layout_validation.h"
#include "tinyxml_layout_parser.h"
#include "util.h"
#include "tinyxml2.h"
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
namespace {
using namespace tinyxml2;
using android::base::StringPrintf;
using startop::dex::ClassBuilder;
using startop::dex::DexBuilder;
using startop::dex::MethodBuilder;
using startop::dex::Prototype;
using startop::dex::TypeDescriptor;
using namespace startop::util;
using std::string;
constexpr char kStdoutFilename[]{"stdout"};
DEFINE_bool(dex, false, "Generate a DEX file instead of Java");
DEFINE_string(out, kStdoutFilename, "Where to write the generated class");
DEFINE_string(package, "", "The package name for the generated class (required)");
template <typename Visitor>
class XmlVisitorAdapter : public XMLVisitor {
public:
explicit XmlVisitorAdapter(Visitor* visitor) : visitor_{visitor} {}
bool VisitEnter(const XMLDocument& /*doc*/) override {
visitor_->VisitStartDocument();
return true;
}
bool VisitExit(const XMLDocument& /*doc*/) override {
visitor_->VisitEndDocument();
return true;
}
bool VisitEnter(const XMLElement& element, const XMLAttribute* /*firstAttribute*/) override {
visitor_->VisitStartTag(
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.from_bytes(
element.Name()));
return true;
}
bool VisitExit(const XMLElement& /*element*/) override {
visitor_->VisitEndTag();
return true;
}
private:
Visitor* visitor_;
};
template <typename Builder>
void CompileLayout(XMLDocument* xml, Builder* builder) {
startop::LayoutCompilerVisitor visitor{builder};
XmlVisitorAdapter<decltype(visitor)> adapter{&visitor};
xml->Accept(&adapter);
}
} // end namespace
int main(int argc, char** argv) {
constexpr size_t kProgramName = 0;
constexpr size_t kFileNameParam = 1;
constexpr size_t kNumRequiredArgs = 2;
gflags::SetUsageMessage(
"Compile XML layout files into equivalent Java language code\n"
"\n"
" example usage: viewcompiler layout.xml --package com.example.androidapp");
gflags::ParseCommandLineFlags(&argc, &argv, /*remove_flags*/ true);
gflags::CommandLineFlagInfo cmd = gflags::GetCommandLineFlagInfoOrDie("package");
if (argc != kNumRequiredArgs || cmd.is_default) {
gflags::ShowUsageWithFlags(argv[kProgramName]);
return 1;
}
const char* const filename = argv[kFileNameParam];
const string layout_name = startop::util::FindLayoutNameFromFilename(filename);
XMLDocument xml;
xml.LoadFile(filename);
string message{};
if (!startop::CanCompileLayout(xml, &message)) {
LOG(ERROR) << "Layout not supported: " << message;
return 1;
}
const bool is_stdout = FLAGS_out == kStdoutFilename;
std::ofstream outfile;
if (!is_stdout) {
outfile.open(FLAGS_out);
}
if (FLAGS_dex) {
DexBuilder dex_file;
string class_name = StringPrintf("%s.CompiledView", FLAGS_package.c_str());
ClassBuilder compiled_view{dex_file.MakeClass(class_name)};
MethodBuilder method{compiled_view.CreateMethod(
layout_name,
Prototype{TypeDescriptor::FromClassname("android.view.View"),
TypeDescriptor::FromClassname("android.content.Context"),
TypeDescriptor::Int()})};
startop::DexViewBuilder builder{&method};
CompileLayout(&xml, &builder);
method.Encode();
slicer::MemView image{dex_file.CreateImage()};
(is_stdout ? std::cout : outfile).write(image.ptr<const char>(), image.size());
} else {
// Generate Java language output.
JavaLangViewBuilder builder{FLAGS_package, layout_name, is_stdout ? std::cout : outfile};
CompileLayout(&xml, &builder);
}
return 0;
}
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