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e3bbeb7fdc
darling-libcxx/include/format
Thomas A e3bbeb7fdc Update libcxx source to llvmorg-14.0.6
2022-06-26 09:13:52 -07:00

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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
#define _LIBCPP_FORMAT
/*
namespace std {
// [format.context], class template basic_format_context
template<class Out, class charT> class basic_format_context;
using format_context = basic_format_context<unspecified, char>;
using wformat_context = basic_format_context<unspecified, wchar_t>;
// [format.args], class template basic_format_args
template<class Context> class basic_format_args;
using format_args = basic_format_args<format_context>;
using wformat_args = basic_format_args<wformat_context>;
// [format.functions], formatting functions
template<class... Args>
string format(string_view fmt, const Args&... args);
template<class... Args>
wstring format(wstring_view fmt, const Args&... args);
template<class... Args>
string format(const locale& loc, string_view fmt, const Args&... args);
template<class... Args>
wstring format(const locale& loc, wstring_view fmt, const Args&... args);
string vformat(string_view fmt, format_args args);
wstring vformat(wstring_view fmt, wformat_args args);
string vformat(const locale& loc, string_view fmt, format_args args);
wstring vformat(const locale& loc, wstring_view fmt, wformat_args args);
template<class Out, class... Args>
Out format_to(Out out, string_view fmt, const Args&... args);
template<class Out, class... Args>
Out format_to(Out out, wstring_view fmt, const Args&... args);
template<class Out, class... Args>
Out format_to(Out out, const locale& loc, string_view fmt, const Args&... args);
template<class Out, class... Args>
Out format_to(Out out, const locale& loc, wstring_view fmt, const Args&... args);
template<class Out>
Out vformat_to(Out out, string_view fmt, format_args args);
template<class Out>
Out vformat_to(Out out, wstring_view fmt, wformat_args args);
template<class Out>
Out vformat_to(Out out, const locale& loc, string_view fmt,
format_args char> args);
template<class Out>
Out vformat_to(Out out, const locale& loc, wstring_view fmt,
wformat_args args);
template<class Out> struct format_to_n_result {
Out out;
iter_difference_t<Out> size;
};
template<class Out, class... Args>
format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
string_view fmt, const Args&... args);
template<class Out, class... Args>
format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
wstring_view fmt, const Args&... args);
template<class Out, class... Args>
format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
const locale& loc, string_view fmt,
const Args&... args);
template<class Out, class... Args>
format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
const locale& loc, wstring_view fmt,
const Args&... args);
template<class... Args>
size_t formatted_size(string_view fmt, const Args&... args);
template<class... Args>
size_t formatted_size(wstring_view fmt, const Args&... args);
template<class... Args>
size_t formatted_size(const locale& loc, string_view fmt, const Args&... args);
template<class... Args>
size_t formatted_size(const locale& loc, wstring_view fmt, const Args&... args);
// [format.formatter], formatter
template<class T, class charT = char> struct formatter;
// [format.parse.ctx], class template basic_format_parse_context
template<class charT> class basic_format_parse_context;
using format_parse_context = basic_format_parse_context<char>;
using wformat_parse_context = basic_format_parse_context<wchar_t>;
// [format.arguments], arguments
// [format.arg], class template basic_format_arg
template<class Context> class basic_format_arg;
template<class Visitor, class Context>
see below visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg);
// [format.arg.store], class template format-arg-store
template<class Context, class... Args> struct format-arg-store; // exposition only
template<class Context = format_context, class... Args>
format-arg-store<Context, Args...>
make_format_args(const Args&... args);
template<class... Args>
format-arg-store<wformat_context, Args...>
make_wformat_args(const Args&... args);
// [format.error], class format_error
class format_error;
}
*/
// Make sure all feature-test macros are available.
#include <version>
// Enable the contents of the header only when libc++ was built with LIBCXX_ENABLE_INCOMPLETE_FEATURES.
#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
#include <__config>
#include <__debug>
#include <__format/format_arg.h>
#include <__format/format_args.h>
#include <__format/format_context.h>
#include <__format/format_error.h>
#include <__format/format_fwd.h>
#include <__format/format_parse_context.h>
#include <__format/format_string.h>
#include <__format/format_to_n_result.h>
#include <__format/formatter.h>
#include <__format/formatter_bool.h>
#include <__format/formatter_char.h>
#include <__format/formatter_floating_point.h>
#include <__format/formatter_integer.h>
#include <__format/formatter_pointer.h>
#include <__format/formatter_string.h>
#include <__format/parser_std_format_spec.h>
#include <__variant/monostate.h>
#include <array>
#include <concepts>
#include <string>
#include <string_view>
#include <type_traits>
#ifndef _LIBCPP_HAS_NO_LOCALIZATION
#include <locale>
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_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)
// TODO FMT Move the implementation in this file to its own granular headers.
// TODO FMT Evaluate which templates should be external templates. This
// improves the efficiency of the header. However since the header is still
// under heavy development and not all classes are stable it makes no sense
// to do this optimization now.
using format_args = basic_format_args<format_context>;
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
using wformat_args = basic_format_args<wformat_context>;
#endif
template <class _Context, class... _Args>
struct _LIBCPP_TEMPLATE_VIS __format_arg_store {
// TODO FMT Use a built-in array.
array<basic_format_arg<_Context>, sizeof...(_Args)> __args;
};
template <class _Context = format_context, class... _Args>
_LIBCPP_HIDE_FROM_ABI __format_arg_store<_Context, _Args...>
make_format_args(const _Args&... __args) {
return {basic_format_arg<_Context>(__args)...};
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI __format_arg_store<wformat_context, _Args...>
make_wformat_args(const _Args&... __args) {
return _VSTD::make_format_args<wformat_context>(__args...);
}
#endif
namespace __format {
template <class _CharT, class _ParseCtx, class _Ctx>
_LIBCPP_HIDE_FROM_ABI const _CharT*
__handle_replacement_field(const _CharT* __begin, const _CharT* __end,
_ParseCtx& __parse_ctx, _Ctx& __ctx) {
__format::__parse_number_result __r =
__format::__parse_arg_id(__begin, __end, __parse_ctx);
switch (*__r.__ptr) {
case _CharT(':'):
// The arg-id has a format-specifier, advance the input to the format-spec.
__parse_ctx.advance_to(__r.__ptr + 1);
break;
case _CharT('}'):
// The arg-id has no format-specifier.
__parse_ctx.advance_to(__r.__ptr);
break;
default:
__throw_format_error(
"The replacement field arg-id should terminate at a ':' or '}'");
}
_VSTD::visit_format_arg(
[&](auto __arg) {
if constexpr (same_as<decltype(__arg), monostate>)
__throw_format_error("Argument index out of bounds");
else if constexpr (same_as<decltype(__arg), typename basic_format_arg<_Ctx>::handle>)
__arg.format(__parse_ctx, __ctx);
else {
formatter<decltype(__arg), _CharT> __formatter;
__parse_ctx.advance_to(__formatter.parse(__parse_ctx));
__ctx.advance_to(__formatter.format(__arg, __ctx));
}
},
__ctx.arg(__r.__value));
__begin = __parse_ctx.begin();
if (__begin == __end || *__begin != _CharT('}'))
__throw_format_error("The replacement field misses a terminating '}'");
return ++__begin;
}
template <class _ParseCtx, class _Ctx>
_LIBCPP_HIDE_FROM_ABI typename _Ctx::iterator
__vformat_to(_ParseCtx&& __parse_ctx, _Ctx&& __ctx) {
using _CharT = typename _ParseCtx::char_type;
static_assert(same_as<typename _Ctx::char_type, _CharT>);
const _CharT* __begin = __parse_ctx.begin();
const _CharT* __end = __parse_ctx.end();
typename _Ctx::iterator __out_it = __ctx.out();
while (__begin != __end) {
switch (*__begin) {
case _CharT('{'):
++__begin;
if (__begin == __end)
__throw_format_error("The format string terminates at a '{'");
if (*__begin != _CharT('{')) [[likely]] {
__ctx.advance_to(_VSTD::move(__out_it));
__begin =
__handle_replacement_field(__begin, __end, __parse_ctx, __ctx);
__out_it = __ctx.out();
// The output is written and __begin points to the next character. So
// start the next iteration.
continue;
}
// The string is an escape character.
break;
case _CharT('}'):
++__begin;
if (__begin == __end || *__begin != _CharT('}'))
__throw_format_error(
"The format string contains an invalid escape sequence");
break;
}
// Copy the character to the output verbatim.
*__out_it++ = *__begin++;
}
return __out_it;
}
} // namespace __format
template <class _OutIt, class _CharT, class _FormatOutIt>
requires(output_iterator<_OutIt, const _CharT&>) _LIBCPP_HIDE_FROM_ABI _OutIt
__vformat_to(
_OutIt __out_it, basic_string_view<_CharT> __fmt,
basic_format_args<basic_format_context<_FormatOutIt, _CharT>> __args) {
if constexpr (same_as<_OutIt, _FormatOutIt>)
return _VSTD::__format::__vformat_to(
basic_format_parse_context{__fmt, __args.__size()},
_VSTD::__format_context_create(_VSTD::move(__out_it), __args));
else {
basic_string<_CharT> __str;
_VSTD::__format::__vformat_to(
basic_format_parse_context{__fmt, __args.__size()},
_VSTD::__format_context_create(_VSTD::back_inserter(__str), __args));
return _VSTD::copy_n(__str.begin(), __str.size(), _VSTD::move(__out_it));
}
}
template <output_iterator<const char&> _OutIt>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
vformat_to(_OutIt __out_it, string_view __fmt, format_args __args) {
return _VSTD::__vformat_to(_VSTD::move(__out_it), __fmt, __args);
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <output_iterator<const wchar_t&> _OutIt>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
vformat_to(_OutIt __out_it, wstring_view __fmt, wformat_args __args) {
return _VSTD::__vformat_to(_VSTD::move(__out_it), __fmt, __args);
}
#endif
template <output_iterator<const char&> _OutIt, class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
format_to(_OutIt __out_it, string_view __fmt, const _Args&... __args) {
return _VSTD::vformat_to(_VSTD::move(__out_it), __fmt,
_VSTD::make_format_args(__args...));
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <output_iterator<const wchar_t&> _OutIt, class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
format_to(_OutIt __out_it, wstring_view __fmt, const _Args&... __args) {
return _VSTD::vformat_to(_VSTD::move(__out_it), __fmt,
_VSTD::make_wformat_args(__args...));
}
#endif
_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
vformat(string_view __fmt, format_args __args) {
string __res;
_VSTD::vformat_to(_VSTD::back_inserter(__res), __fmt, __args);
return __res;
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
vformat(wstring_view __fmt, wformat_args __args) {
wstring __res;
_VSTD::vformat_to(_VSTD::back_inserter(__res), __fmt, __args);
return __res;
}
#endif
template <class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
format(string_view __fmt, const _Args&... __args) {
return _VSTD::vformat(__fmt, _VSTD::make_format_args(__args...));
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
format(wstring_view __fmt, const _Args&... __args) {
return _VSTD::vformat(__fmt, _VSTD::make_wformat_args(__args...));
}
#endif
template <output_iterator<const char&> _OutIt, class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, string_view __fmt,
const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
string __str = _VSTD::vformat(__fmt, _VSTD::make_format_args(__args...));
iter_difference_t<_OutIt> __s = __str.size();
iter_difference_t<_OutIt> __m =
_VSTD::clamp(__n, iter_difference_t<_OutIt>(0), __s);
__out_it = _VSTD::copy_n(__str.begin(), __m, _VSTD::move(__out_it));
return {_VSTD::move(__out_it), __s};
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <output_iterator<const wchar_t&> _OutIt, class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, wstring_view __fmt,
const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
wstring __str = _VSTD::vformat(__fmt, _VSTD::make_wformat_args(__args...));
iter_difference_t<_OutIt> __s = __str.size();
iter_difference_t<_OutIt> __m =
_VSTD::clamp(__n, iter_difference_t<_OutIt>(0), __s);
__out_it = _VSTD::copy_n(__str.begin(), __m, _VSTD::move(__out_it));
return {_VSTD::move(__out_it), __s};
}
#endif
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
formatted_size(string_view __fmt, const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
return _VSTD::vformat(__fmt, _VSTD::make_format_args(__args...)).size();
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
formatted_size(wstring_view __fmt, const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
return _VSTD::vformat(__fmt, _VSTD::make_wformat_args(__args...)).size();
}
#endif
#ifndef _LIBCPP_HAS_NO_LOCALIZATION
template <class _OutIt, class _CharT, class _FormatOutIt>
requires(output_iterator<_OutIt, const _CharT&>) _LIBCPP_HIDE_FROM_ABI _OutIt
__vformat_to(
_OutIt __out_it, locale __loc, basic_string_view<_CharT> __fmt,
basic_format_args<basic_format_context<_FormatOutIt, _CharT>> __args) {
if constexpr (same_as<_OutIt, _FormatOutIt>)
return _VSTD::__format::__vformat_to(
basic_format_parse_context{__fmt, __args.__size()},
_VSTD::__format_context_create(_VSTD::move(__out_it), __args,
_VSTD::move(__loc)));
else {
basic_string<_CharT> __str;
_VSTD::__format::__vformat_to(
basic_format_parse_context{__fmt, __args.__size()},
_VSTD::__format_context_create(_VSTD::back_inserter(__str), __args,
_VSTD::move(__loc)));
return _VSTD::copy_n(__str.begin(), __str.size(), _VSTD::move(__out_it));
}
}
template <output_iterator<const char&> _OutIt>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt vformat_to(
_OutIt __out_it, locale __loc, string_view __fmt, format_args __args) {
return _VSTD::__vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
__args);
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <output_iterator<const wchar_t&> _OutIt>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt vformat_to(
_OutIt __out_it, locale __loc, wstring_view __fmt, wformat_args __args) {
return _VSTD::__vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
__args);
}
#endif
template <output_iterator<const char&> _OutIt, class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt format_to(
_OutIt __out_it, locale __loc, string_view __fmt, const _Args&... __args) {
return _VSTD::vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
_VSTD::make_format_args(__args...));
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <output_iterator<const wchar_t&> _OutIt, class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt format_to(
_OutIt __out_it, locale __loc, wstring_view __fmt, const _Args&... __args) {
return _VSTD::vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
_VSTD::make_wformat_args(__args...));
}
#endif
_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
vformat(locale __loc, string_view __fmt, format_args __args) {
string __res;
_VSTD::vformat_to(_VSTD::back_inserter(__res), _VSTD::move(__loc), __fmt,
__args);
return __res;
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
vformat(locale __loc, wstring_view __fmt, wformat_args __args) {
wstring __res;
_VSTD::vformat_to(_VSTD::back_inserter(__res), _VSTD::move(__loc), __fmt,
__args);
return __res;
}
#endif
template <class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
format(locale __loc, string_view __fmt, const _Args&... __args) {
return _VSTD::vformat(_VSTD::move(__loc), __fmt,
_VSTD::make_format_args(__args...));
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <class... _Args>
_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
format(locale __loc, wstring_view __fmt, const _Args&... __args) {
return _VSTD::vformat(_VSTD::move(__loc), __fmt,
_VSTD::make_wformat_args(__args...));
}
#endif
template <output_iterator<const char&> _OutIt, class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, locale __loc,
string_view __fmt, const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
string __str = _VSTD::vformat(_VSTD::move(__loc), __fmt,
_VSTD::make_format_args(__args...));
iter_difference_t<_OutIt> __s = __str.size();
iter_difference_t<_OutIt> __m =
_VSTD::clamp(__n, iter_difference_t<_OutIt>(0), __s);
__out_it = _VSTD::copy_n(__str.begin(), __m, _VSTD::move(__out_it));
return {_VSTD::move(__out_it), __s};
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <output_iterator<const wchar_t&> _OutIt, class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, locale __loc,
wstring_view __fmt, const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
wstring __str = _VSTD::vformat(_VSTD::move(__loc), __fmt,
_VSTD::make_wformat_args(__args...));
iter_difference_t<_OutIt> __s = __str.size();
iter_difference_t<_OutIt> __m =
_VSTD::clamp(__n, iter_difference_t<_OutIt>(0), __s);
__out_it = _VSTD::copy_n(__str.begin(), __m, _VSTD::move(__out_it));
return {_VSTD::move(__out_it), __s};
}
#endif
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
formatted_size(locale __loc, string_view __fmt, const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
return _VSTD::vformat(_VSTD::move(__loc), __fmt,
_VSTD::make_format_args(__args...))
.size();
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
formatted_size(locale __loc, wstring_view __fmt, const _Args&... __args) {
// TODO FMT Improve PoC: using std::string is inefficient.
return _VSTD::vformat(_VSTD::move(__loc), __fmt,
_VSTD::make_wformat_args(__args...))
.size();
}
#endif
#endif // _LIBCPP_HAS_NO_LOCALIZATION
#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
#endif //_LIBCPP_STD_VER > 17
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
#endif // _LIBCPP_FORMAT
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