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