forked from OSchip/llvm-project
260 lines
8.9 KiB
C++
260 lines
8.9 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_FORMAT_ARG_H
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#define _LIBCPP___FORMAT_FORMAT_ARG_H
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#include <__concepts/arithmetic.h>
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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 <__functional_base>
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#include <__variant/monostate.h>
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#include <string>
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#include <string_view>
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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_PUSH_MACROS
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#include <__undef_macros>
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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 {
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/// The type stored in @ref basic_format_arg.
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///
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/// @note The 128-bit types are unconditionally in the list to avoid the values
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/// of the enums to depend on the availability of 128-bit integers.
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enum class _LIBCPP_ENUM_VIS __arg_t : uint8_t {
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__none,
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__boolean,
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__char_type,
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__int,
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__long_long,
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__i128,
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__unsigned,
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__unsigned_long_long,
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__u128,
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__float,
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__double,
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__long_double,
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__const_char_type_ptr,
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__string_view,
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__ptr
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};
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} // namespace __format
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template <class _Visitor, class _Context>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT decltype(auto)
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visit_format_arg(_Visitor&& __vis, basic_format_arg<_Context> __arg) {
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switch (__arg.__type_) {
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case __format::__arg_t::__none:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), monostate{});
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case __format::__arg_t::__boolean:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__boolean);
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case __format::__arg_t::__char_type:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__char_type);
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case __format::__arg_t::__int:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__int);
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case __format::__arg_t::__long_long:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__long_long);
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case __format::__arg_t::__i128:
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#ifndef _LIBCPP_HAS_NO_INT128
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__i128);
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#else
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_LIBCPP_UNREACHABLE();
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#endif
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case __format::__arg_t::__unsigned:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__unsigned);
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case __format::__arg_t::__unsigned_long_long:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis),
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__arg.__unsigned_long_long);
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case __format::__arg_t::__u128:
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#ifndef _LIBCPP_HAS_NO_INT128
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__u128);
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#else
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_LIBCPP_UNREACHABLE();
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#endif
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case __format::__arg_t::__float:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__float);
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case __format::__arg_t::__double:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__double);
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case __format::__arg_t::__long_double:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__long_double);
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case __format::__arg_t::__const_char_type_ptr:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis),
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__arg.__const_char_type_ptr);
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case __format::__arg_t::__string_view:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__string_view);
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case __format::__arg_t::__ptr:
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return _VSTD::invoke(_VSTD::forward<_Visitor>(__vis), __arg.__ptr);
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}
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_LIBCPP_UNREACHABLE();
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}
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template <class _Context>
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class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_arg {
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public:
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// TODO FMT Define the handle class.
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class handle;
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_LIBCPP_HIDE_FROM_ABI basic_format_arg() noexcept
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: __type_{__format::__arg_t::__none} {}
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_LIBCPP_HIDE_FROM_ABI explicit operator bool() const noexcept {
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return __type_ != __format::__arg_t::__none;
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}
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private:
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using char_type = typename _Context::char_type;
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// TODO FMT Implement constrain [format.arg]/4
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// Constraints: The template specialization
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// typename Context::template formatter_type<T>
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// meets the Formatter requirements ([formatter.requirements]). The extent
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// to which an implementation determines that the specialization meets the
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// Formatter requirements is unspecified, except that as a minimum the
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// expression
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// typename Context::template formatter_type<T>()
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// .format(declval<const T&>(), declval<Context&>())
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// shall be well-formed when treated as an unevaluated operand.
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template <class _Ctx, class... _Args>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_AVAILABILITY_FORMAT friend __format_arg_store<_Ctx, _Args...>
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_VSTD::make_format_args(const _Args&...);
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template <class _Visitor, class _Ctx>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT friend decltype(auto)
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_VSTD::visit_format_arg(_Visitor&& __vis, basic_format_arg<_Ctx> __arg);
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union {
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bool __boolean;
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char_type __char_type;
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int __int;
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unsigned __unsigned;
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long long __long_long;
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unsigned long long __unsigned_long_long;
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#ifndef _LIBCPP_HAS_NO_INT128
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__int128_t __i128;
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__uint128_t __u128;
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#endif
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float __float;
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double __double;
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long double __long_double;
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const char_type* __const_char_type_ptr;
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basic_string_view<char_type> __string_view;
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const void* __ptr;
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// TODO FMT Add the handle.
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};
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__format::__arg_t __type_;
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(bool __v) noexcept
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: __boolean(__v), __type_(__format::__arg_t::__boolean) {}
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(_Tp __v) noexcept
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requires(same_as<_Tp, char_type> ||
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(same_as<_Tp, char> && same_as<char_type, wchar_t>))
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: __char_type(__v), __type_(__format::__arg_t::__char_type) {}
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template <__libcpp_signed_integer _Tp>
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(_Tp __v) noexcept {
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if constexpr (sizeof(_Tp) <= sizeof(int)) {
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__int = static_cast<int>(__v);
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__type_ = __format::__arg_t::__int;
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} else if constexpr (sizeof(_Tp) <= sizeof(long long)) {
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__long_long = static_cast<long long>(__v);
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__type_ = __format::__arg_t::__long_long;
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}
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#ifndef _LIBCPP_HAS_NO_INT128
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else if constexpr (sizeof(_Tp) == sizeof(__int128_t)) {
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__i128 = __v;
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__type_ = __format::__arg_t::__i128;
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}
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#endif
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else
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static_assert(sizeof(_Tp) == 0, "An unsupported signed integer was used");
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}
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template <__libcpp_unsigned_integer _Tp>
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(_Tp __v) noexcept {
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if constexpr (sizeof(_Tp) <= sizeof(unsigned)) {
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__unsigned = static_cast<unsigned>(__v);
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__type_ = __format::__arg_t::__unsigned;
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} else if constexpr (sizeof(_Tp) <= sizeof(unsigned long long)) {
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__unsigned_long_long = static_cast<unsigned long long>(__v);
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__type_ = __format::__arg_t::__unsigned_long_long;
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}
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#ifndef _LIBCPP_HAS_NO_INT128
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else if constexpr (sizeof(_Tp) == sizeof(__int128_t)) {
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__u128 = __v;
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__type_ = __format::__arg_t::__u128;
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}
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#endif
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else
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static_assert(sizeof(_Tp) == 0,
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"An unsupported unsigned integer was used");
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}
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(float __v) noexcept
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: __float(__v), __type_(__format::__arg_t::__float) {}
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(double __v) noexcept
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: __double(__v), __type_(__format::__arg_t::__double) {}
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(long double __v) noexcept
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: __long_double(__v), __type_(__format::__arg_t::__long_double) {}
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// Note not a 'noexcept' function.
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(const char_type* __s)
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: __const_char_type_ptr(__s),
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__type_(__format::__arg_t::__const_char_type_ptr) {
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_LIBCPP_ASSERT(__s, "Used a nullptr argument to initialize a C-string");
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}
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template <class _Traits>
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(
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basic_string_view<char_type, _Traits> __s) noexcept
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: __string_view{__s.data(), __s.size()},
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__type_(__format::__arg_t::__string_view) {}
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template <class _Traits, class _Allocator>
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_LIBCPP_HIDE_FROM_ABI explicit basic_format_arg(
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const basic_string<char_type, _Traits, _Allocator>& __s) noexcept
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: __string_view{__s.data(), __s.size()},
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__type_(__format::__arg_t::__string_view) {}
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_LIBCPP_HIDE_FROM_ABI
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explicit basic_format_arg(nullptr_t) noexcept
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: __ptr(nullptr), __type_(__format::__arg_t::__ptr) {}
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// TODO FMT Implement the _Tp* constructor.
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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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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___FORMAT_FORMAT_ARG_H
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