2b8b48c5a0
[format.formatter.spec]/5 lists the requirements for the default formatter. The original implementation didn't implement this. This implements the default formatter according to the Standard. This adds additional test to validate the default formatter is disabled and the required standard formatters are enabled. While adding the tests it seems the formatters needed a constraint for the character types they were valid for. Implements parts of: - P0645 Text Formatting Depends on D115988 Reviewed By: ldionne, #libc Differential Revision: https://reviews.llvm.org/D115989
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 <__formatter::__char_type _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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