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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___FORMAT_FORMATTER_BOOL_H
#define _LIBCPP___FORMAT_FORMATTER_BOOL_H
#include <__availability>
#include <__config>
#include <__format/format_error.h>
#include <__format/format_fwd.h>
#include <__format/formatter.h>
#include <__format/formatter_integral.h>
#include <__format/parser_std_format_spec.h>
#include <string_view>
#ifndef _LIBCPP_HAS_NO_LOCALIZATION
#include <locale>
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER > 17
// TODO FMT Remove this once we require compilers with proper C++20 support.
// If the compiler has no concepts support, the format header will be disabled.
// Without concepts support enable_if needs to be used and that too much effort
// to support compilers with partial C++20 support.
#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
namespace __format_spec {
template <class _CharT>
class _LIBCPP_TEMPLATE_VIS __parser_bool : public __parser_integral<_CharT> {
public:
_LIBCPP_HIDE_FROM_ABI constexpr auto parse(auto& __parse_ctx)
-> decltype(__parse_ctx.begin()) {
auto __it = __parser_integral<_CharT>::__parse(__parse_ctx);
switch (this->__type) {
case _Flags::_Type::__default:
this->__type = _Flags::_Type::__string;
[[fallthrough]];
case _Flags::_Type::__string:
this->__handle_bool();
break;
case _Flags::_Type::__char:
this->__handle_char();
break;
case _Flags::_Type::__binary_lower_case:
case _Flags::_Type::__binary_upper_case:
case _Flags::_Type::__octal:
case _Flags::_Type::__decimal:
case _Flags::_Type::__hexadecimal_lower_case:
case _Flags::_Type::__hexadecimal_upper_case:
this->__handle_integer();
break;
default:
__throw_format_error(
"The format-spec type has a type not supported for a bool argument");
}
return __it;
}
};
template <class _CharT>
struct _LIBCPP_TEMPLATE_VIS __bool_strings;
template <>
struct _LIBCPP_TEMPLATE_VIS __bool_strings<char> {
static constexpr string_view __true{"true"};
static constexpr string_view __false{"false"};
};
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <>
struct _LIBCPP_TEMPLATE_VIS __bool_strings<wchar_t> {
static constexpr wstring_view __true{L"true"};
static constexpr wstring_view __false{L"false"};
};
#endif
template <class _CharT>
using __formatter_bool = __formatter_integral<__parser_bool<_CharT>>;
} //namespace __format_spec
// [format.formatter.spec]/2.3
// For each charT, for each cv-unqualified arithmetic type ArithmeticT other
// than char, wchar_t, char8_t, char16_t, or char32_t, a specialization
template <__formatter::__char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<bool, _CharT>
: public __format_spec::__formatter_bool<_CharT> {
using _Base = __format_spec::__formatter_bool<_CharT>;
_LIBCPP_HIDE_FROM_ABI auto format(bool __value, auto& __ctx)
-> decltype(__ctx.out()) {
if (this->__type != __format_spec::_Flags::_Type::__string)
return _Base::format(static_cast<unsigned char>(__value), __ctx);
if (this->__width_needs_substitution())
this->__substitute_width_arg_id(__ctx.arg(this->__width));
#ifndef _LIBCPP_HAS_NO_LOCALIZATION
if (this->__locale_specific_form) {
const auto& __np = use_facet<numpunct<_CharT>>(__ctx.locale());
basic_string<_CharT> __str = __value ? __np.truename() : __np.falsename();
return __formatter::__write_unicode(
__ctx.out(), basic_string_view<_CharT>{__str}, this->__width, -1,
this->__fill, this->__alignment);
}
#endif
basic_string_view<_CharT> __str =
__value ? __format_spec::__bool_strings<_CharT>::__true
: __format_spec::__bool_strings<_CharT>::__false;
// The output only uses ASCII so every character is one column.
unsigned __size = __str.size();
if (__size >= this->__width)
return _VSTD::copy(__str.begin(), __str.end(), __ctx.out());
return __formatter::__write(__ctx.out(), __str.begin(), __str.end(), __size,
this->__width, this->__fill, this->__alignment);
}
};
#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
#endif //_LIBCPP_STD_VER > 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___FORMAT_FORMATTER_BOOL_H
|
