text: /*
   * Copyright 2016 WebAssembly Community Group participants
   *
   * 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.
   */
  
  //
  // wasm2asm console tool
  //
  
  #include "support/colors.h"
  #include "support/command-line.h"
  #include "support/file.h"
  #include "wasm-binary.h"
  #include "wasm-s-parser.h"
  
  #include "tool-utils.h"
  
  using namespace cashew;
  using namespace wasm;
  
  int main(int argc, const char *argv[]) {
    bool debugInfo = false;
    std::string symbolMap;
    std::string sourceMapFilename;
    std::string sourceMapUrl;
    Options options("wasm-as", "Assemble a .wast (WebAssembly text format) into a .wasm (WebAssembly binary format)");
    options.extra["validate"] = "wasm";
    options
        .add("--output", "-o", "Output file (stdout if not specified)",
             Options::Arguments::One,
             [](Options *o, const std::string &argument) {
               o->extra["output"] = argument;
               Colors::disable();
             })
        .add("--validate", "-v", "Control validation of the output module",
             Options::Arguments::One,
             [](Options *o, const std::string &argument) {
               if (argument != "web" && argument != "none" && argument != "wasm") {
                 std::cerr << "Valid arguments for --validate flag are 'wasm', 'web', and 'none'.\n";
                 exit(1);
               }
               o->extra["validate"] = argument;
             })
        .add("--debuginfo", "-g", "Emit names section and debug info",
             Options::Arguments::Zero,
             [&](Options *o, const std::string &arguments) { debugInfo = true; })
        .add("--source-map", "-sm", "Emit source map to the specified file",
             Options::Arguments::One,
             [&sourceMapFilename](Options *o, const std::string &argument) { sourceMapFilename = argument; })
        .add("--source-map-url", "-su", "Use specified string as source map URL",
             Options::Arguments::One,
             [&sourceMapUrl](Options *o, const std::string &argument) { sourceMapUrl = argument; })
        .add("--symbolmap", "-s", "Emit a symbol map (indexes => names)",
             Options::Arguments::One,
             [&](Options *o, const std::string &argument) { symbolMap = argument; })
        .add_positional("INFILE", Options::Arguments::One,
                        [](Options *o, const std::string &argument) {
                          o->extra["infile"] = argument;
                        });
    options.parse(argc, argv);
  
    // default output is infile with changed suffix
    if (options.extra.find("output") == options.extra.end()) {
      options.extra["output"] = removeSpecificSuffix(options.extra["infile"], ".wast") + ".wasm";
    }
  
    auto input(read_file<std::string>(options.extra["infile"], Flags::Text, options.debug ? Flags::Debug : Flags::Release));
  
    Module wasm;
  
    try {
      if (options.debug) std::cerr << "s-parsing..." << std::endl;
      SExpressionParser parser(const_cast<char*>(input.c_str()));
      Element& root = *parser.root;
      if (options.debug) std::cerr << "w-parsing..." << std::endl;
      SExpressionWasmBuilder builder(wasm, *root[0]);
    } catch (ParseException& p) {
      p.dump(std::cerr);
      Fatal() << "error in parsing input";
    }
  
    if (options.extra["validate"] != "none") {
      if (options.debug) std::cerr << "Validating..." << std::endl;
      if (!wasm::WasmValidator().validate(wasm,
          options.extra["validate"] == "web")) {
        Fatal() << "Error: input module is not valid.\n";
      }
    }
  
    if (options.debug) std::cerr << "binarification..." << std::endl;
    BufferWithRandomAccess buffer(options.debug);
    WasmBinaryWriter writer(&wasm, buffer, options.debug);
    // if debug info is used, then we want to emit the names section
    writer.setNamesSection(debugInfo);
    std::unique_ptr<std::ofstream> sourceMapStream = nullptr;
    if (sourceMapFilename.size()) {
      sourceMapStream = make_unique<std::ofstream>();
      sourceMapStream->open(sourceMapFilename);
      writer.setSourceMap(sourceMapStream.get(), sourceMapUrl);
    }
    if (symbolMap.size() > 0) writer.setSymbolMap(symbolMap);
    writer.write();
  
    if (options.debug) std::cerr << "writing to output..." << std::endl;
    Output output(options.extra["output"], Flags::Binary, options.debug ? Flags::Debug : Flags::Release);
    buffer.writeTo(output);
    if (sourceMapStream) {
      sourceMapStream->close();
    }
  
    if (options.debug) std::cerr << "Done." << std::endl;
  }
  