__cxx03/__format/formatter_char.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03___FORMAT_FORMATTER_CHAR_H
0011 #define _LIBCPP___CXX03___FORMAT_FORMATTER_CHAR_H
0012
0013 #include <__cxx03/__concepts/same_as.h>
0014 #include <__cxx03/__config>
0015 #include <__cxx03/__format/concepts.h>
0016 #include <__cxx03/__format/format_parse_context.h>
0017 #include <__cxx03/__format/formatter.h>
0018 #include <__cxx03/__format/formatter_integral.h>
0019 #include <__cxx03/__format/formatter_output.h>
0020 #include <__cxx03/__format/parser_std_format_spec.h>
0021 #include <__cxx03/__format/write_escaped.h>
0022 #include <__cxx03/__type_traits/conditional.h>
0023 #include <__cxx03/__type_traits/make_unsigned.h>
0024
0025 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0026 #  pragma GCC system_header
0027 #endif
0028
0029 _LIBCPP_BEGIN_NAMESPACE_STD
0030
0031 #if _LIBCPP_STD_VER >= 20
0032
0033 template <__fmt_char_type _CharT>
0034 struct _LIBCPP_TEMPLATE_VIS __formatter_char {
0035 public:
0036   template <class _ParseContext>
0037   _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) {
0038     typename _ParseContext::iterator __result = __parser_.__parse(__ctx, __format_spec::__fields_integral);
0039     __format_spec::__process_parsed_char(__parser_, "a character");
0040     return __result;
0041   }
0042
0043   template <class _FormatContext>
0044   _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(_CharT __value, _FormatContext& __ctx) const {
0045     if (__parser_.__type_ == __format_spec::__type::__default || __parser_.__type_ == __format_spec::__type::__char)
0046       return __formatter::__format_char(__value, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
0047
0048 #  if _LIBCPP_STD_VER >= 23
0049     if (__parser_.__type_ == __format_spec::__type::__debug)
0050       return __formatter::__format_escaped_char(__value, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
0051 #  endif
0052
0053     if constexpr (sizeof(_CharT) <= sizeof(unsigned))
0054       return __formatter::__format_integer(
0055           static_cast<unsigned>(static_cast<make_unsigned_t<_CharT>>(__value)),
0056           __ctx,
0057           __parser_.__get_parsed_std_specifications(__ctx));
0058     else
0059       return __formatter::__format_integer(
0060           static_cast<make_unsigned_t<_CharT>>(__value), __ctx, __parser_.__get_parsed_std_specifications(__ctx));
0061   }
0062
0063   template <class _FormatContext>
0064   _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(char __value, _FormatContext& __ctx) const
0065     requires(same_as<_CharT, wchar_t>)
0066   {
0067     return format(static_cast<wchar_t>(static_cast<unsigned char>(__value)), __ctx);
0068   }
0069
0070 #  if _LIBCPP_STD_VER >= 23
0071   _LIBCPP_HIDE_FROM_ABI constexpr void set_debug_format() { __parser_.__type_ = __format_spec::__type::__debug; }
0072 #  endif
0073
0074   __format_spec::__parser<_CharT> __parser_;
0075 };
0076
0077 template <>
0078 struct _LIBCPP_TEMPLATE_VIS formatter<char, char> : public __formatter_char<char> {};
0079
0080 #  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
0081 template <>
0082 struct _LIBCPP_TEMPLATE_VIS formatter<char, wchar_t> : public __formatter_char<wchar_t> {};
0083
0084 template <>
0085 struct _LIBCPP_TEMPLATE_VIS formatter<wchar_t, wchar_t> : public __formatter_char<wchar_t> {};
0086
0087 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
0088
0089 #endif //_LIBCPP_STD_VER >= 20
0090
0091 _LIBCPP_END_NAMESPACE_STD
0092
0093 #endif // _LIBCPP___CXX03___FORMAT_FORMATTER_CHAR_H