// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "generator.h"

bool RustBindingGenerator::header(std::ofstream& os) {
  if (!Generator::header(os)) {
    return false;
  }
  os << "#[link(name = \"zircon\")]\n";
  os << "extern {\n";
  return os.good();
}

bool RustBindingGenerator::footer(std::ofstream& os) {
  if (!Generator::footer(os)) {
    return false;
  }
  os << "}\n";
  return os.good();
}

bool RustBindingGenerator::syscall(std::ofstream& os, const Syscall& sc) {
  if (sc.is_internal()) {
    return os.good();
  }

  os << "    pub fn zx_" << sc.name << "(";

  // Writes all arguments.
  sc.for_each_kernel_arg(
      [&](const TypeSpec& arg) { os << "\n        " << arg.as_rust_declaration() << ","; });

  if (!os.good()) {
    return false;
  }

  if (sc.num_kernel_args() > 0) {
    // remove the comma.
    os.seekp(-1, std::ios_base::end);
  }
  // Finish off list and write return type
  os << "\n        )";
  if (sc.return_type() != "void") {
    os << " -> " << map_override(sc.return_type(), rust_primitives);
  }
  os << ";\n\n";

  return os.good();
}