blame: source/misc/embedded_libs/fmt-11.0.2/include/fmt/ostream.h

// Formatting library for C++ - std::ostream support

//

// Copyright (c) 2012 - present, Victor Zverovich

// All rights reserved.

//

// For the license information refer to format.h.

#ifndef FMT_OSTREAM_H_

#define FMT_OSTREAM_H_

#ifndef FMT_MODULE

#  include <fstream>  // std::filebuf

#endif

#ifdef _WIN32

#  ifdef __GLIBCXX__

#    include <ext/stdio_filebuf.h>

#    include <ext/stdio_sync_filebuf.h>

#  endif

#  include <io.h>

#endif

#include "chrono.h"  // formatbuf

FMT_BEGIN_NAMESPACE

namespace detail {

// Generate a unique explicit instantion in every translation unit using a tag

// type in an anonymous namespace.

namespace {

struct file_access_tag {};

}  // namespace

template <typename Tag, typename BufType, FILE* BufType::*FileMemberPtr>

class file_access {

  friend auto get_file(BufType& obj) -> FILE* { return obj.*FileMemberPtr; }

};

#if FMT_MSC_VERSION

template class file_access<file_access_tag, std::filebuf,

                           &std::filebuf::_Myfile>;

auto get_file(std::filebuf&) -> FILE*;

#endif

inline auto write_ostream_unicode(std::ostream& os, fmt::string_view data)

    -> bool {

  FILE* f = nullptr;

#if FMT_MSC_VERSION && FMT_USE_RTTI

  if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))

    f = get_file(*buf);

  else

    return false;

#elif defined(_WIN32) && defined(__GLIBCXX__) && FMT_USE_RTTI

  auto* rdbuf = os.rdbuf();

  if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))

    f = sfbuf->file();

  else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))

    f = fbuf->file();

  else

    return false;

#else

  ignore_unused(os, data, f);

#endif

#ifdef _WIN32

  if (f) {

    int fd = _fileno(f);

    if (_isatty(fd)) {

      os.flush();

      return write_console(fd, data);

    }

  }

#endif

  return false;

}

inline auto write_ostream_unicode(std::wostream&,

                                  fmt::basic_string_view<wchar_t>) -> bool {

  return false;

}

// Write the content of buf to os.

// It is a separate function rather than a part of vprint to simplify testing.

template <typename Char>

void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {

  const Char* buf_data = buf.data();

  using unsigned_streamsize = std::make_unsigned<std::streamsize>::type;

  unsigned_streamsize size = buf.size();

  unsigned_streamsize max_size = to_unsigned(max_value<std::streamsize>());

  do {

    unsigned_streamsize n = size <= max_size ? size : max_size;

    os.write(buf_data, static_cast<std::streamsize>(n));

    buf_data += n;

    size -= n;

  } while (size != 0);

}

template <typename Char, typename T>

void format_value(buffer<Char>& buf, const T& value) {

  auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);

  auto&& output = std::basic_ostream<Char>(&format_buf);

#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)

  output.imbue(std::locale::classic());  // The default is always unlocalized.

#endif

  output << value;

  output.exceptions(std::ios_base::failbit | std::ios_base::badbit);

}

template <typename T> struct streamed_view {

  const T& value;

};

}  // namespace detail

// Formats an object of type T that has an overloaded ostream operator<<.

template <typename Char>

struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {

  void set_debug_format() = delete;

  template <typename T, typename Context>

  auto format(const T& value, Context& ctx) const -> decltype(ctx.out()) {

    auto buffer = basic_memory_buffer<Char>();

    detail::format_value(buffer, value);

    return formatter<basic_string_view<Char>, Char>::format(

        {buffer.data(), buffer.size()}, ctx);

  }

};

using ostream_formatter = basic_ostream_formatter<char>;

template <typename T, typename Char>

struct formatter<detail::streamed_view<T>, Char>

    : basic_ostream_formatter<Char> {

  template <typename Context>

  auto format(detail::streamed_view<T> view, Context& ctx) const

      -> decltype(ctx.out()) {

    return basic_ostream_formatter<Char>::format(view.value, ctx);

  }

};

/**

 * Returns a view that formats `value` via an ostream `operator<<`.

 *

 * **Example**:

 *

 *     fmt::print("Current thread id: {}\n",

 *                fmt::streamed(std::this_thread::get_id()));

 */

template <typename T>

constexpr auto streamed(const T& value) -> detail::streamed_view<T> {

  return {value};

}

namespace detail {

inline void vprint_directly(std::ostream& os, string_view format_str,

                            format_args args) {

  auto buffer = memory_buffer();

  detail::vformat_to(buffer, format_str, args);

  detail::write_buffer(os, buffer);

}

}  // namespace detail

FMT_EXPORT template <typename Char>

void vprint(std::basic_ostream<Char>& os,

            basic_string_view<type_identity_t<Char>> format_str,

            typename detail::vformat_args<Char>::type args) {

  auto buffer = basic_memory_buffer<Char>();

  detail::vformat_to(buffer, format_str, args);

  if (detail::write_ostream_unicode(os, {buffer.data(), buffer.size()})) return;

  detail::write_buffer(os, buffer);

}

/**

 * Prints formatted data to the stream `os`.

 *

 * **Example**:

 *

 *     fmt::print(cerr, "Don't {}!", "panic");

 */

FMT_EXPORT template <typename... T>

void print(std::ostream& os, format_string<T...> fmt, T&&... args) {

  const auto& vargs = fmt::make_format_args(args...);

  if (detail::use_utf8())

    vprint(os, fmt, vargs);

  else

    detail::vprint_directly(os, fmt, vargs);

}

FMT_EXPORT

template <typename... Args>

void print(std::wostream& os,

           basic_format_string<wchar_t, type_identity_t<Args>...> fmt,

           Args&&... args) {

  vprint(os, fmt, fmt::make_format_args<buffered_context<wchar_t>>(args...));

}

FMT_EXPORT template <typename... T>

void println(std::ostream& os, format_string<T...> fmt, T&&... args) {

  fmt::print(os, "{}\n", fmt::format(fmt, std::forward<T>(args)...));

}

FMT_EXPORT

template <typename... Args>

void println(std::wostream& os,

             basic_format_string<wchar_t, type_identity_t<Args>...> fmt,

             Args&&... args) {

  print(os, L"{}\n", fmt::format(fmt, std::forward<Args>(args)...));

}

FMT_END_NAMESPACE

#endif  // FMT_OSTREAM_H_