246 lines
7.1 KiB
C++
246 lines
7.1 KiB
C++
// Formatting library for C++ - std::ostream support
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_OSTREAM_H_
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#define FMT_OSTREAM_H_
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#include <fstream> // std::filebuf
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#ifdef _WIN32
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# ifdef __GLIBCXX__
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# include <ext/stdio_filebuf.h>
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# include <ext/stdio_sync_filebuf.h>
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# endif
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# include <io.h>
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#endif
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#include "format.h"
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FMT_BEGIN_NAMESPACE
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namespace detail {
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template <typename Streambuf> class formatbuf : public Streambuf {
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private:
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using char_type = typename Streambuf::char_type;
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using streamsize = decltype(std::declval<Streambuf>().sputn(nullptr, 0));
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using int_type = typename Streambuf::int_type;
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using traits_type = typename Streambuf::traits_type;
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buffer<char_type>& buffer_;
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public:
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explicit formatbuf(buffer<char_type>& buf) : buffer_(buf) {}
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protected:
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// The put area is always empty. This makes the implementation simpler and has
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// the advantage that the streambuf and the buffer are always in sync and
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// sputc never writes into uninitialized memory. A disadvantage is that each
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// call to sputc always results in a (virtual) call to overflow. There is no
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// disadvantage here for sputn since this always results in a call to xsputn.
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auto overflow(int_type ch) -> int_type override {
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if (!traits_type::eq_int_type(ch, traits_type::eof()))
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buffer_.push_back(static_cast<char_type>(ch));
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return ch;
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}
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auto xsputn(const char_type* s, streamsize count) -> streamsize override {
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buffer_.append(s, s + count);
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return count;
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}
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};
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// Generate a unique explicit instantion in every translation unit using a tag
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// type in an anonymous namespace.
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namespace {
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struct file_access_tag {};
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} // namespace
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template <typename Tag, typename BufType, FILE* BufType::*FileMemberPtr>
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class file_access {
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friend auto get_file(BufType& obj) -> FILE* { return obj.*FileMemberPtr; }
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};
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#if FMT_MSC_VERSION
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template class file_access<file_access_tag, std::filebuf,
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&std::filebuf::_Myfile>;
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auto get_file(std::filebuf&) -> FILE*;
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#endif
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inline auto write_ostream_unicode(std::ostream& os, fmt::string_view data)
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-> bool {
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FILE* f = nullptr;
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#if FMT_MSC_VERSION
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if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))
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f = get_file(*buf);
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else
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return false;
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#elif defined(_WIN32) && defined(__GLIBCXX__)
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auto* rdbuf = os.rdbuf();
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if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
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f = sfbuf->file();
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else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
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f = fbuf->file();
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else
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return false;
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#else
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ignore_unused(os, data, f);
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#endif
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#ifdef _WIN32
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if (f) {
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int fd = _fileno(f);
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if (_isatty(fd)) {
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os.flush();
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return write_console(fd, data);
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}
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}
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#endif
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return false;
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}
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inline auto write_ostream_unicode(std::wostream&,
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fmt::basic_string_view<wchar_t>) -> bool {
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return false;
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}
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// Write the content of buf to os.
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// It is a separate function rather than a part of vprint to simplify testing.
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template <typename Char>
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void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
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const Char* buf_data = buf.data();
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using unsigned_streamsize = std::make_unsigned<std::streamsize>::type;
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unsigned_streamsize size = buf.size();
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unsigned_streamsize max_size = to_unsigned(max_value<std::streamsize>());
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do {
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unsigned_streamsize n = size <= max_size ? size : max_size;
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os.write(buf_data, static_cast<std::streamsize>(n));
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buf_data += n;
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size -= n;
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} while (size != 0);
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}
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template <typename Char, typename T>
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void format_value(buffer<Char>& buf, const T& value) {
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auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
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auto&& output = std::basic_ostream<Char>(&format_buf);
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#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
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output.imbue(std::locale::classic()); // The default is always unlocalized.
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#endif
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output << value;
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output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
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}
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template <typename T> struct streamed_view {
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const T& value;
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};
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} // namespace detail
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// Formats an object of type T that has an overloaded ostream operator<<.
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template <typename Char>
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struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {
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void set_debug_format() = delete;
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template <typename T, typename OutputIt>
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auto format(const T& value, basic_format_context<OutputIt, Char>& ctx) const
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-> OutputIt {
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auto buffer = basic_memory_buffer<Char>();
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detail::format_value(buffer, value);
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return formatter<basic_string_view<Char>, Char>::format(
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{buffer.data(), buffer.size()}, ctx);
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}
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};
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using ostream_formatter = basic_ostream_formatter<char>;
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template <typename T, typename Char>
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struct formatter<detail::streamed_view<T>, Char>
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: basic_ostream_formatter<Char> {
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template <typename OutputIt>
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auto format(detail::streamed_view<T> view,
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basic_format_context<OutputIt, Char>& ctx) const -> OutputIt {
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return basic_ostream_formatter<Char>::format(view.value, ctx);
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}
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};
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/**
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\rst
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Returns a view that formats `value` via an ostream ``operator<<``.
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**Example**::
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fmt::print("Current thread id: {}\n",
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fmt::streamed(std::this_thread::get_id()));
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\endrst
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*/
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template <typename T>
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constexpr auto streamed(const T& value) -> detail::streamed_view<T> {
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return {value};
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}
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namespace detail {
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inline void vprint_directly(std::ostream& os, string_view format_str,
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format_args args) {
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auto buffer = memory_buffer();
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detail::vformat_to(buffer, format_str, args);
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detail::write_buffer(os, buffer);
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}
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} // namespace detail
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FMT_EXPORT template <typename Char>
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void vprint(std::basic_ostream<Char>& os,
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basic_string_view<type_identity_t<Char>> format_str,
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basic_format_args<buffer_context<type_identity_t<Char>>> args) {
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auto buffer = basic_memory_buffer<Char>();
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detail::vformat_to(buffer, format_str, args);
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if (detail::write_ostream_unicode(os, {buffer.data(), buffer.size()})) return;
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detail::write_buffer(os, buffer);
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}
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/**
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\rst
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Prints formatted data to the stream *os*.
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**Example**::
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fmt::print(cerr, "Don't {}!", "panic");
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\endrst
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*/
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FMT_EXPORT template <typename... T>
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void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
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const auto& vargs = fmt::make_format_args(args...);
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if (detail::is_utf8())
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vprint(os, fmt, vargs);
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else
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detail::vprint_directly(os, fmt, vargs);
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}
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FMT_EXPORT
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template <typename... Args>
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void print(std::wostream& os,
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basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
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Args&&... args) {
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vprint(os, fmt, fmt::make_format_args<buffer_context<wchar_t>>(args...));
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}
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FMT_EXPORT template <typename... T>
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void println(std::ostream& os, format_string<T...> fmt, T&&... args) {
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fmt::print(os, "{}\n", fmt::format(fmt, std::forward<T>(args)...));
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}
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FMT_EXPORT
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template <typename... Args>
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void println(std::wostream& os,
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basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
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Args&&... args) {
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print(os, L"{}\n", fmt::format(fmt, std::forward<Args>(args)...));
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}
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FMT_END_NAMESPACE
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#endif // FMT_OSTREAM_H_
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