1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef _LIBCPP___FORMAT_FORMATTER_CHAR_H
11 #define _LIBCPP___FORMAT_FORMATTER_CHAR_H
12 
13 #include <__availability>
14 #include <__concepts/same_as.h>
15 #include <__config>
16 #include <__format/concepts.h>
17 #include <__format/format_parse_context.h>
18 #include <__format/formatter.h>
19 #include <__format/formatter_integral.h>
20 #include <__format/formatter_output.h>
21 #include <__format/parser_std_format_spec.h>
22 #include <__type_traits/conditional.h>
23 #include <__type_traits/is_signed.h>
24 
25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
26 #  pragma GCC system_header
27 #endif
28 
29 _LIBCPP_BEGIN_NAMESPACE_STD
30 
31 #if _LIBCPP_STD_VER > 17
32 
33 template <__fmt_char_type _CharT>
34 struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_char {
35 public:
36   _LIBCPP_HIDE_FROM_ABI constexpr auto
37   parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
38     auto __result = __parser_.__parse(__parse_ctx, __format_spec::__fields_integral);
39     __format_spec::__process_parsed_char(__parser_);
40     return __result;
41   }
42 
43   _LIBCPP_HIDE_FROM_ABI auto format(_CharT __value, auto& __ctx) const -> decltype(__ctx.out()) {
44     if (__parser_.__type_ == __format_spec::__type::__default || __parser_.__type_ == __format_spec::__type::__char)
45       return __formatter::__format_char(__value, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
46 
47 #  if _LIBCPP_STD_VER > 20
48     if (__parser_.__type_ == __format_spec::__type::__debug)
49       return __formatter::__format_escaped_char(__value, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx));
50 #  endif
51 
52     if constexpr (sizeof(_CharT) <= sizeof(int))
53       // Promotes _CharT to an integral type. This reduces the number of
54       // instantiations of __format_integer reducing code size.
55       return __formatter::__format_integer(
56           static_cast<conditional_t<is_signed_v<_CharT>, int, unsigned>>(__value),
57           __ctx,
58           __parser_.__get_parsed_std_specifications(__ctx));
59     else
60       return __formatter::__format_integer(__value, __ctx, __parser_.__get_parsed_std_specifications(__ctx));
61   }
62 
63   _LIBCPP_HIDE_FROM_ABI auto format(char __value, auto& __ctx) const -> decltype(__ctx.out())
64     requires(same_as<_CharT, wchar_t>)
65   {
66     return format(static_cast<wchar_t>(__value), __ctx);
67   }
68 
69 #  if _LIBCPP_STD_VER > 20
70   _LIBCPP_HIDE_FROM_ABI constexpr void set_debug_format() { __parser_.__type_ = __format_spec::__type::__debug; }
71 #  endif
72 
73   __format_spec::__parser<_CharT> __parser_;
74 };
75 
76 template <>
77 struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<char, char> : public __formatter_char<char> {};
78 
79 #  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
80 template <>
81 struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<char, wchar_t> : public __formatter_char<wchar_t> {};
82 
83 template <>
84 struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<wchar_t, wchar_t> : public __formatter_char<wchar_t> {
85 };
86 
87 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
88 
89 #endif //_LIBCPP_STD_VER > 17
90 
91 _LIBCPP_END_NAMESPACE_STD
92 
93 #endif // _LIBCPP___FORMAT_FORMATTER_CHAR_H
94