| // -*- 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_STRING_H |
| #define _LIBCPP___FORMAT_FORMATTER_STRING_H |
| |
| #include <__availability> |
| #include <__config> |
| #include <__format/concepts.h> |
| #include <__format/format_parse_context.h> |
| #include <__format/formatter.h> |
| #include <__format/formatter_output.h> |
| #include <__format/parser_std_format_spec.h> |
| #include <__utility/move.h> |
| #include <string> |
| #include <string_view> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 17 |
| |
| template <__fmt_char_type _CharT> |
| struct _LIBCPP_TEMPLATE_VIS __formatter_string { |
| public: |
| _LIBCPP_HIDE_FROM_ABI constexpr auto parse(basic_format_parse_context<_CharT>& __parse_ctx) |
| -> decltype(__parse_ctx.begin()) { |
| auto __result = __parser_.__parse(__parse_ctx, __format_spec::__fields_string); |
| __format_spec::__process_display_type_string(__parser_.__type_); |
| return __result; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(basic_string_view<_CharT> __str, auto& __ctx) const -> decltype(__ctx.out()) { |
| return __formatter::__write_string(__str, __ctx.out(), __parser_.__get_parsed_std_specifications(__ctx)); |
| } |
| |
| __format_spec::__parser<_CharT> __parser_; |
| }; |
| |
| // Formatter const char*. |
| template <__fmt_char_type _CharT> |
| struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const _CharT*, _CharT> |
| : public __formatter_string<_CharT> { |
| using _Base = __formatter_string<_CharT>; |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(const _CharT* __str, auto& __ctx) const -> decltype(__ctx.out()) { |
| _LIBCPP_ASSERT(__str, "The basic_format_arg constructor should have " |
| "prevented an invalid pointer."); |
| |
| // When using a center or right alignment and the width option the length |
| // of __str must be known to add the padding upfront. This case is handled |
| // by the base class by converting the argument to a basic_string_view. |
| // |
| // When using left alignment and the width option the padding is added |
| // after outputting __str so the length can be determined while outputting |
| // __str. The same holds true for the precision, during outputting __str it |
| // can be validated whether the precision threshold has been reached. For |
| // now these optimizations aren't implemented. Instead the base class |
| // handles these options. |
| // TODO FMT Implement these improvements. |
| __format_spec::__parsed_specifications<_CharT> __specs = _Base::__parser_.__get_parsed_std_specifications(__ctx); |
| if (__specs.__has_width() || __specs.__has_precision()) |
| return __formatter::__write_string(basic_string_view<_CharT>{__str}, __ctx.out(), __specs); |
| |
| // No formatting required, copy the string to the output. |
| auto __out_it = __ctx.out(); |
| while (*__str) |
| *__out_it++ = *__str++; |
| return __out_it; |
| } |
| }; |
| |
| // Formatter char*. |
| template <__fmt_char_type _CharT> |
| struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_CharT*, _CharT> |
| : public formatter<const _CharT*, _CharT> { |
| using _Base = formatter<const _CharT*, _CharT>; |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(_CharT* __str, auto& __ctx) const -> decltype(__ctx.out()) { |
| return _Base::format(__str, __ctx); |
| } |
| }; |
| |
| // Formatter char[]. |
| template <__fmt_char_type _CharT, size_t _Size> |
| struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_CharT[_Size], _CharT> |
| : public __formatter_string<_CharT> { |
| using _Base = __formatter_string<_CharT>; |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(_CharT __str[_Size], auto& __ctx) const -> decltype(__ctx.out()) { |
| return _Base::format(basic_string_view<_CharT>(__str, _Size), __ctx); |
| } |
| }; |
| |
| // Formatter const char[]. |
| template <__fmt_char_type _CharT, size_t _Size> |
| struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const _CharT[_Size], _CharT> |
| : public __formatter_string<_CharT> { |
| using _Base = __formatter_string<_CharT>; |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(const _CharT __str[_Size], auto& __ctx) const -> decltype(__ctx.out()) { |
| return _Base::format(basic_string_view<_CharT>(__str, _Size), __ctx); |
| } |
| }; |
| |
| // Formatter std::string. |
| template <__fmt_char_type _CharT, class _Traits, class _Allocator> |
| struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<basic_string<_CharT, _Traits, _Allocator>, _CharT> |
| : public __formatter_string<_CharT> { |
| using _Base = __formatter_string<_CharT>; |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(const basic_string<_CharT, _Traits, _Allocator>& __str, auto& __ctx) const |
| -> decltype(__ctx.out()) { |
| // Drop _Traits and _Allocator to have one std::basic_string formatter. |
| return _Base::format(basic_string_view<_CharT>(__str.data(), __str.size()), __ctx); |
| } |
| }; |
| |
| // Formatter std::string_view. |
| template <__fmt_char_type _CharT, class _Traits> |
| struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<basic_string_view<_CharT, _Traits>, _CharT> |
| : public __formatter_string<_CharT> { |
| using _Base = __formatter_string<_CharT>; |
| |
| _LIBCPP_HIDE_FROM_ABI auto format(basic_string_view<_CharT, _Traits> __str, auto& __ctx) const |
| -> decltype(__ctx.out()) { |
| // Drop _Traits to have one std::basic_string_view formatter. |
| return _Base::format(basic_string_view<_CharT>(__str.data(), __str.size()), __ctx); |
| } |
| }; |
| |
| #endif //_LIBCPP_STD_VER > 17 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___FORMAT_FORMATTER_STRING_H |