From: John Benediktsson Date: Wed, 7 Feb 2024 18:47:15 +0000 (-0800) Subject: vm: use the ``fmt`` library to fix shortest decimal representation issue. X-Git-Url: https://gitweb.factorcode.org/gitweb.cgi?p=factor.git;a=commitdiff_plain;h=4a58c56e7eb9d056e986b0a783ae3d59830f6123 vm: use the ``fmt`` library to fix shortest decimal representation issue. Before: IN: scratchpad 0x1.1ffffffffffffp7 . 144.0 IN: scratchpad 0x1.2p7 . 144.0 IN: scratchpad 0x1.2000000000001p7 . 144.0 After: IN: scratchpad 0x1.1ffffffffffffp7 . 143.99999999999997 IN: scratchpad 0x1.2p7 . 144.0 IN: scratchpad 0x1.2000000000001p7 . 144.00000000000003 Perhaps we should implement the Dragonbox algorithm ourselves at some point. --- diff --git a/GNUmakefile b/GNUmakefile index 36d83ef5d1..e9452fba6d 100644 --- a/GNUmakefile +++ b/GNUmakefile @@ -74,6 +74,7 @@ ifdef CONFIG vm/entry_points.o \ vm/errors.o \ vm/factor.o \ + vm/format.o \ vm/full_collector.o \ vm/gc.o \ vm/image.o \ diff --git a/vm/fmt/core.h b/vm/fmt/core.h new file mode 100644 index 0000000000..b51c1406a9 --- /dev/null +++ b/vm/fmt/core.h @@ -0,0 +1,2969 @@ +// Formatting library for C++ - the core API for char/UTF-8 +// +// Copyright (c) 2012 - present, Victor Zverovich +// All rights reserved. +// +// For the license information refer to format.h. + +#ifndef FMT_CORE_H_ +#define FMT_CORE_H_ + +#include // std::byte +#include // std::FILE +#include // std::strlen +#include +#include +#include // std::addressof +#include +#include + +// The fmt library version in the form major * 10000 + minor * 100 + patch. +#define FMT_VERSION 100201 + +#if defined(__clang__) && !defined(__ibmxl__) +# define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__) +#else +# define FMT_CLANG_VERSION 0 +#endif + +#if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && \ + !defined(__NVCOMPILER) +# define FMT_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +#else +# define FMT_GCC_VERSION 0 +#endif + +#ifndef FMT_GCC_PRAGMA +// Workaround _Pragma bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59884. +# if FMT_GCC_VERSION >= 504 +# define FMT_GCC_PRAGMA(arg) _Pragma(arg) +# else +# define FMT_GCC_PRAGMA(arg) +# endif +#endif + +#ifdef __ICL +# define FMT_ICC_VERSION __ICL +#elif defined(__INTEL_COMPILER) +# define FMT_ICC_VERSION __INTEL_COMPILER +#else +# define FMT_ICC_VERSION 0 +#endif + +#ifdef _MSC_VER +# define FMT_MSC_VERSION _MSC_VER +# define FMT_MSC_WARNING(...) __pragma(warning(__VA_ARGS__)) +#else +# define FMT_MSC_VERSION 0 +# define FMT_MSC_WARNING(...) +#endif + +#ifdef _MSVC_LANG +# define FMT_CPLUSPLUS _MSVC_LANG +#else +# define FMT_CPLUSPLUS __cplusplus +#endif + +#ifdef __has_feature +# define FMT_HAS_FEATURE(x) __has_feature(x) +#else +# define FMT_HAS_FEATURE(x) 0 +#endif + +#if defined(__has_include) || FMT_ICC_VERSION >= 1600 || FMT_MSC_VERSION > 1900 +# define FMT_HAS_INCLUDE(x) __has_include(x) +#else +# define FMT_HAS_INCLUDE(x) 0 +#endif + +#ifdef __has_cpp_attribute +# define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) +#else +# define FMT_HAS_CPP_ATTRIBUTE(x) 0 +#endif + +#define FMT_HAS_CPP14_ATTRIBUTE(attribute) \ + (FMT_CPLUSPLUS >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute)) + +#define FMT_HAS_CPP17_ATTRIBUTE(attribute) \ + (FMT_CPLUSPLUS >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute)) + +// Check if relaxed C++14 constexpr is supported. +// GCC doesn't allow throw in constexpr until version 6 (bug 67371). +#ifndef FMT_USE_CONSTEXPR +# if (FMT_HAS_FEATURE(cxx_relaxed_constexpr) || FMT_MSC_VERSION >= 1912 || \ + (FMT_GCC_VERSION >= 600 && FMT_CPLUSPLUS >= 201402L)) && \ + !FMT_ICC_VERSION && (!defined(__NVCC__) || FMT_CPLUSPLUS >= 202002L) +# define FMT_USE_CONSTEXPR 1 +# else +# define FMT_USE_CONSTEXPR 0 +# endif +#endif +#if FMT_USE_CONSTEXPR +# define FMT_CONSTEXPR constexpr +#else +# define FMT_CONSTEXPR +#endif + +#if (FMT_CPLUSPLUS >= 202002L || \ + (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)) && \ + ((!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE >= 10) && \ + (!defined(_LIBCPP_VERSION) || _LIBCPP_VERSION >= 10000) && \ + (!FMT_MSC_VERSION || FMT_MSC_VERSION >= 1928)) && \ + defined(__cpp_lib_is_constant_evaluated) +# define FMT_CONSTEXPR20 constexpr +#else +# define FMT_CONSTEXPR20 +#endif + +// Check if constexpr std::char_traits<>::{compare,length} are supported. +#if defined(__GLIBCXX__) +# if FMT_CPLUSPLUS >= 201703L && defined(_GLIBCXX_RELEASE) && \ + _GLIBCXX_RELEASE >= 7 // GCC 7+ libstdc++ has _GLIBCXX_RELEASE. +# define FMT_CONSTEXPR_CHAR_TRAITS constexpr +# endif +#elif defined(_LIBCPP_VERSION) && FMT_CPLUSPLUS >= 201703L && \ + _LIBCPP_VERSION >= 4000 +# define FMT_CONSTEXPR_CHAR_TRAITS constexpr +#elif FMT_MSC_VERSION >= 1914 && FMT_CPLUSPLUS >= 201703L +# define FMT_CONSTEXPR_CHAR_TRAITS constexpr +#endif +#ifndef FMT_CONSTEXPR_CHAR_TRAITS +# define FMT_CONSTEXPR_CHAR_TRAITS +#endif + +// Check if exceptions are disabled. +#ifndef FMT_EXCEPTIONS +# if (defined(__GNUC__) && !defined(__EXCEPTIONS)) || \ + (FMT_MSC_VERSION && !_HAS_EXCEPTIONS) +# define FMT_EXCEPTIONS 0 +# else +# define FMT_EXCEPTIONS 1 +# endif +#endif + +// Disable [[noreturn]] on MSVC/NVCC because of bogus unreachable code warnings. +#if FMT_EXCEPTIONS && FMT_HAS_CPP_ATTRIBUTE(noreturn) && !FMT_MSC_VERSION && \ + !defined(__NVCC__) +# define FMT_NORETURN [[noreturn]] +#else +# define FMT_NORETURN +#endif + +#ifndef FMT_NODISCARD +# if FMT_HAS_CPP17_ATTRIBUTE(nodiscard) +# define FMT_NODISCARD [[nodiscard]] +# else +# define FMT_NODISCARD +# endif +#endif + +#ifndef FMT_INLINE +# if FMT_GCC_VERSION || FMT_CLANG_VERSION +# define FMT_INLINE inline __attribute__((always_inline)) +# else +# define FMT_INLINE inline +# endif +#endif + +#ifdef _MSC_VER +# define FMT_UNCHECKED_ITERATOR(It) \ + using _Unchecked_type = It // Mark iterator as checked. +#else +# define FMT_UNCHECKED_ITERATOR(It) using unchecked_type = It +#endif + +#ifndef FMT_BEGIN_NAMESPACE +# define FMT_BEGIN_NAMESPACE \ + namespace fmt { \ + inline namespace v10 { +# define FMT_END_NAMESPACE \ + } \ + } +#endif + +#ifndef FMT_EXPORT +# define FMT_EXPORT +# define FMT_BEGIN_EXPORT +# define FMT_END_EXPORT +#endif + +#if FMT_GCC_VERSION || FMT_CLANG_VERSION +# define FMT_VISIBILITY(value) __attribute__((visibility(value))) +#else +# define FMT_VISIBILITY(value) +#endif + +#if !defined(FMT_HEADER_ONLY) && defined(_WIN32) +# if defined(FMT_LIB_EXPORT) +# define FMT_API __declspec(dllexport) +# elif defined(FMT_SHARED) +# define FMT_API __declspec(dllimport) +# endif +#elif defined(FMT_LIB_EXPORT) || defined(FMT_SHARED) +# define FMT_API FMT_VISIBILITY("default") +#endif +#ifndef FMT_API +# define FMT_API +#endif + +// libc++ supports string_view in pre-c++17. +#if FMT_HAS_INCLUDE() && \ + (FMT_CPLUSPLUS >= 201703L || defined(_LIBCPP_VERSION)) +# include +# define FMT_USE_STRING_VIEW +#elif FMT_HAS_INCLUDE("experimental/string_view") && FMT_CPLUSPLUS >= 201402L +# include +# define FMT_USE_EXPERIMENTAL_STRING_VIEW +#endif + +#ifndef FMT_UNICODE +# define FMT_UNICODE !FMT_MSC_VERSION +#endif + +#ifndef FMT_CONSTEVAL +# if ((FMT_GCC_VERSION >= 1000 || FMT_CLANG_VERSION >= 1101) && \ + (!defined(__apple_build_version__) || \ + __apple_build_version__ >= 14000029L) && \ + FMT_CPLUSPLUS >= 202002L) || \ + (defined(__cpp_consteval) && \ + (!FMT_MSC_VERSION || FMT_MSC_VERSION >= 1929)) +// consteval is broken in MSVC before VS2019 version 16.10 and Apple clang +// before 14. +# define FMT_CONSTEVAL consteval +# define FMT_HAS_CONSTEVAL +# else +# define FMT_CONSTEVAL +# endif +#endif + +#ifndef FMT_USE_NONTYPE_TEMPLATE_ARGS +# if defined(__cpp_nontype_template_args) && \ + ((FMT_GCC_VERSION >= 903 && FMT_CPLUSPLUS >= 201709L) || \ + __cpp_nontype_template_args >= 201911L) && \ + !defined(__NVCOMPILER) && !defined(__LCC__) +# define FMT_USE_NONTYPE_TEMPLATE_ARGS 1 +# else +# define FMT_USE_NONTYPE_TEMPLATE_ARGS 0 +# endif +#endif + +// GCC < 5 requires this-> in decltype +#ifndef FMT_DECLTYPE_THIS +# if FMT_GCC_VERSION && FMT_GCC_VERSION < 500 +# define FMT_DECLTYPE_THIS this-> +# else +# define FMT_DECLTYPE_THIS +# endif +#endif + +// Enable minimal optimizations for more compact code in debug mode. +FMT_GCC_PRAGMA("GCC push_options") +#if !defined(__OPTIMIZE__) && !defined(__NVCOMPILER) && !defined(__LCC__) && \ + !defined(__CUDACC__) +FMT_GCC_PRAGMA("GCC optimize(\"Og\")") +#endif + +FMT_BEGIN_NAMESPACE + +// Implementations of enable_if_t and other metafunctions for older systems. +template +using enable_if_t = typename std::enable_if::type; +template +using conditional_t = typename std::conditional::type; +template using bool_constant = std::integral_constant; +template +using remove_reference_t = typename std::remove_reference::type; +template +using remove_const_t = typename std::remove_const::type; +template +using remove_cvref_t = typename std::remove_cv>::type; +template struct type_identity { + using type = T; +}; +template using type_identity_t = typename type_identity::type; +template +using underlying_t = typename std::underlying_type::type; + +// Checks whether T is a container with contiguous storage. +template struct is_contiguous : std::false_type {}; +template +struct is_contiguous> : std::true_type {}; + +struct monostate { + constexpr monostate() {} +}; + +// An enable_if helper to be used in template parameters which results in much +// shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed +// to workaround a bug in MSVC 2019 (see #1140 and #1186). +#ifdef FMT_DOC +# define FMT_ENABLE_IF(...) +#else +# define FMT_ENABLE_IF(...) fmt::enable_if_t<(__VA_ARGS__), int> = 0 +#endif + +// This is defined in core.h instead of format.h to avoid injecting in std. +// It is a template to avoid undesirable implicit conversions to std::byte. +#ifdef __cpp_lib_byte +template ::value)> +inline auto format_as(T b) -> unsigned char { + return static_cast(b); +} +#endif + +namespace detail { +// Suppresses "unused variable" warnings with the method described in +// https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/. +// (void)var does not work on many Intel compilers. +template FMT_CONSTEXPR void ignore_unused(const T&...) {} + +constexpr FMT_INLINE auto is_constant_evaluated( + bool default_value = false) noexcept -> bool { +// Workaround for incompatibility between libstdc++ consteval-based +// std::is_constant_evaluated() implementation and clang-14. +// https://github.com/fmtlib/fmt/issues/3247 +#if FMT_CPLUSPLUS >= 202002L && defined(_GLIBCXX_RELEASE) && \ + _GLIBCXX_RELEASE >= 12 && \ + (FMT_CLANG_VERSION >= 1400 && FMT_CLANG_VERSION < 1500) + ignore_unused(default_value); + return __builtin_is_constant_evaluated(); +#elif defined(__cpp_lib_is_constant_evaluated) + ignore_unused(default_value); + return std::is_constant_evaluated(); +#else + return default_value; +#endif +} + +// Suppresses "conditional expression is constant" warnings. +template constexpr FMT_INLINE auto const_check(T value) -> T { + return value; +} + +FMT_NORETURN FMT_API void assert_fail(const char* file, int line, + const char* message); + +#ifndef FMT_ASSERT +# ifdef NDEBUG +// FMT_ASSERT is not empty to avoid -Wempty-body. +# define FMT_ASSERT(condition, message) \ + fmt::detail::ignore_unused((condition), (message)) +# else +# define FMT_ASSERT(condition, message) \ + ((condition) /* void() fails with -Winvalid-constexpr on clang 4.0.1 */ \ + ? (void)0 \ + : fmt::detail::assert_fail(__FILE__, __LINE__, (message))) +# endif +#endif + +#if defined(FMT_USE_STRING_VIEW) +template using std_string_view = std::basic_string_view; +#elif defined(FMT_USE_EXPERIMENTAL_STRING_VIEW) +template +using std_string_view = std::experimental::basic_string_view; +#else +template struct std_string_view {}; +#endif + +#ifdef FMT_USE_INT128 +// Do nothing. +#elif defined(__SIZEOF_INT128__) && !defined(__NVCC__) && \ + !(FMT_CLANG_VERSION && FMT_MSC_VERSION) +# define FMT_USE_INT128 1 +using int128_opt = __int128_t; // An optional native 128-bit integer. +using uint128_opt = __uint128_t; +template inline auto convert_for_visit(T value) -> T { + return value; +} +#else +# define FMT_USE_INT128 0 +#endif +#if !FMT_USE_INT128 +enum class int128_opt {}; +enum class uint128_opt {}; +// Reduce template instantiations. +template auto convert_for_visit(T) -> monostate { return {}; } +#endif + +// Casts a nonnegative integer to unsigned. +template +FMT_CONSTEXPR auto to_unsigned(Int value) -> + typename std::make_unsigned::type { + FMT_ASSERT(std::is_unsigned::value || value >= 0, "negative value"); + return static_cast::type>(value); +} + +FMT_CONSTEXPR inline auto is_utf8() -> bool { + FMT_MSC_WARNING(suppress : 4566) constexpr unsigned char section[] = "\u00A7"; + + // Avoid buggy sign extensions in MSVC's constant evaluation mode (#2297). + using uchar = unsigned char; + return FMT_UNICODE || (sizeof(section) == 3 && uchar(section[0]) == 0xC2 && + uchar(section[1]) == 0xA7); +} +} // namespace detail + +/** + An implementation of ``std::basic_string_view`` for pre-C++17. It provides a + subset of the API. ``fmt::basic_string_view`` is used for format strings even + if ``std::string_view`` is available to prevent issues when a library is + compiled with a different ``-std`` option than the client code (which is not + recommended). + */ +FMT_EXPORT +template class basic_string_view { + private: + const Char* data_; + size_t size_; + + public: + using value_type = Char; + using iterator = const Char*; + + constexpr basic_string_view() noexcept : data_(nullptr), size_(0) {} + + /** Constructs a string reference object from a C string and a size. */ + constexpr basic_string_view(const Char* s, size_t count) noexcept + : data_(s), size_(count) {} + + /** + \rst + Constructs a string reference object from a C string computing + the size with ``std::char_traits::length``. + \endrst + */ + FMT_CONSTEXPR_CHAR_TRAITS + FMT_INLINE + basic_string_view(const Char* s) + : data_(s), + size_(detail::const_check(std::is_same::value && + !detail::is_constant_evaluated(true)) + ? std::strlen(reinterpret_cast(s)) + : std::char_traits::length(s)) {} + + /** Constructs a string reference from a ``std::basic_string`` object. */ + template + FMT_CONSTEXPR basic_string_view( + const std::basic_string& s) noexcept + : data_(s.data()), size_(s.size()) {} + + template >::value)> + FMT_CONSTEXPR basic_string_view(S s) noexcept + : data_(s.data()), size_(s.size()) {} + + /** Returns a pointer to the string data. */ + constexpr auto data() const noexcept -> const Char* { return data_; } + + /** Returns the string size. */ + constexpr auto size() const noexcept -> size_t { return size_; } + + constexpr auto begin() const noexcept -> iterator { return data_; } + constexpr auto end() const noexcept -> iterator { return data_ + size_; } + + constexpr auto operator[](size_t pos) const noexcept -> const Char& { + return data_[pos]; + } + + FMT_CONSTEXPR void remove_prefix(size_t n) noexcept { + data_ += n; + size_ -= n; + } + + FMT_CONSTEXPR_CHAR_TRAITS auto starts_with( + basic_string_view sv) const noexcept -> bool { + return size_ >= sv.size_ && + std::char_traits::compare(data_, sv.data_, sv.size_) == 0; + } + FMT_CONSTEXPR_CHAR_TRAITS auto starts_with(Char c) const noexcept -> bool { + return size_ >= 1 && std::char_traits::eq(*data_, c); + } + FMT_CONSTEXPR_CHAR_TRAITS auto starts_with(const Char* s) const -> bool { + return starts_with(basic_string_view(s)); + } + + // Lexicographically compare this string reference to other. + FMT_CONSTEXPR_CHAR_TRAITS auto compare(basic_string_view other) const -> int { + size_t str_size = size_ < other.size_ ? size_ : other.size_; + int result = std::char_traits::compare(data_, other.data_, str_size); + if (result == 0) + result = size_ == other.size_ ? 0 : (size_ < other.size_ ? -1 : 1); + return result; + } + + FMT_CONSTEXPR_CHAR_TRAITS friend auto operator==(basic_string_view lhs, + basic_string_view rhs) + -> bool { + return lhs.compare(rhs) == 0; + } + friend auto operator!=(basic_string_view lhs, basic_string_view rhs) -> bool { + return lhs.compare(rhs) != 0; + } + friend auto operator<(basic_string_view lhs, basic_string_view rhs) -> bool { + return lhs.compare(rhs) < 0; + } + friend auto operator<=(basic_string_view lhs, basic_string_view rhs) -> bool { + return lhs.compare(rhs) <= 0; + } + friend auto operator>(basic_string_view lhs, basic_string_view rhs) -> bool { + return lhs.compare(rhs) > 0; + } + friend auto operator>=(basic_string_view lhs, basic_string_view rhs) -> bool { + return lhs.compare(rhs) >= 0; + } +}; + +FMT_EXPORT +using string_view = basic_string_view; + +/** Specifies if ``T`` is a character type. Can be specialized by users. */ +FMT_EXPORT +template struct is_char : std::false_type {}; +template <> struct is_char : std::true_type {}; + +namespace detail { + +// A base class for compile-time strings. +struct compile_string {}; + +template +struct is_compile_string : std::is_base_of {}; + +template ::value)> +FMT_INLINE auto to_string_view(const Char* s) -> basic_string_view { + return s; +} +template +inline auto to_string_view(const std::basic_string& s) + -> basic_string_view { + return s; +} +template +constexpr auto to_string_view(basic_string_view s) + -> basic_string_view { + return s; +} +template >::value)> +inline auto to_string_view(std_string_view s) -> basic_string_view { + return s; +} +template ::value)> +constexpr auto to_string_view(const S& s) + -> basic_string_view { + return basic_string_view(s); +} +void to_string_view(...); + +// Specifies whether S is a string type convertible to fmt::basic_string_view. +// It should be a constexpr function but MSVC 2017 fails to compile it in +// enable_if and MSVC 2015 fails to compile it as an alias template. +// ADL is intentionally disabled as to_string_view is not an extension point. +template +struct is_string + : std::is_class()))> {}; + +template struct char_t_impl {}; +template struct char_t_impl::value>> { + using result = decltype(to_string_view(std::declval())); + using type = typename result::value_type; +}; + +enum class type { + none_type, + // Integer types should go first, + int_type, + uint_type, + long_long_type, + ulong_long_type, + int128_type, + uint128_type, + bool_type, + char_type, + last_integer_type = char_type, + // followed by floating-point types. + float_type, + double_type, + long_double_type, + last_numeric_type = long_double_type, + cstring_type, + string_type, + pointer_type, + custom_type +}; + +// Maps core type T to the corresponding type enum constant. +template +struct type_constant : std::integral_constant {}; + +#define FMT_TYPE_CONSTANT(Type, constant) \ + template \ + struct type_constant \ + : std::integral_constant {} + +FMT_TYPE_CONSTANT(int, int_type); +FMT_TYPE_CONSTANT(unsigned, uint_type); +FMT_TYPE_CONSTANT(long long, long_long_type); +FMT_TYPE_CONSTANT(unsigned long long, ulong_long_type); +FMT_TYPE_CONSTANT(int128_opt, int128_type); +FMT_TYPE_CONSTANT(uint128_opt, uint128_type); +FMT_TYPE_CONSTANT(bool, bool_type); +FMT_TYPE_CONSTANT(Char, char_type); +FMT_TYPE_CONSTANT(float, float_type); +FMT_TYPE_CONSTANT(double, double_type); +FMT_TYPE_CONSTANT(long double, long_double_type); +FMT_TYPE_CONSTANT(const Char*, cstring_type); +FMT_TYPE_CONSTANT(basic_string_view, string_type); +FMT_TYPE_CONSTANT(const void*, pointer_type); + +constexpr auto is_integral_type(type t) -> bool { + return t > type::none_type && t <= type::last_integer_type; +} +constexpr auto is_arithmetic_type(type t) -> bool { + return t > type::none_type && t <= type::last_numeric_type; +} + +constexpr auto set(type rhs) -> int { return 1 << static_cast(rhs); } +constexpr auto in(type t, int set) -> bool { + return ((set >> static_cast(t)) & 1) != 0; +} + +// Bitsets of types. +enum { + sint_set = + set(type::int_type) | set(type::long_long_type) | set(type::int128_type), + uint_set = set(type::uint_type) | set(type::ulong_long_type) | + set(type::uint128_type), + bool_set = set(type::bool_type), + char_set = set(type::char_type), + float_set = set(type::float_type) | set(type::double_type) | + set(type::long_double_type), + string_set = set(type::string_type), + cstring_set = set(type::cstring_type), + pointer_set = set(type::pointer_type) +}; + +// DEPRECATED! +FMT_NORETURN FMT_API void throw_format_error(const char* message); + +struct error_handler { + constexpr error_handler() = default; + + // This function is intentionally not constexpr to give a compile-time error. + FMT_NORETURN void on_error(const char* message) { + throw_format_error(message); + } +}; +} // namespace detail + +/** Throws ``format_error`` with a given message. */ +using detail::throw_format_error; + +/** String's character type. */ +template using char_t = typename detail::char_t_impl::type; + +/** + \rst + Parsing context consisting of a format string range being parsed and an + argument counter for automatic indexing. + You can use the ``format_parse_context`` type alias for ``char`` instead. + \endrst + */ +FMT_EXPORT +template class basic_format_parse_context { + private: + basic_string_view format_str_; + int next_arg_id_; + + FMT_CONSTEXPR void do_check_arg_id(int id); + + public: + using char_type = Char; + using iterator = const Char*; + + explicit constexpr basic_format_parse_context( + basic_string_view format_str, int next_arg_id = 0) + : format_str_(format_str), next_arg_id_(next_arg_id) {} + + /** + Returns an iterator to the beginning of the format string range being + parsed. + */ + constexpr auto begin() const noexcept -> iterator { + return format_str_.begin(); + } + + /** + Returns an iterator past the end of the format string range being parsed. + */ + constexpr auto end() const noexcept -> iterator { return format_str_.end(); } + + /** Advances the begin iterator to ``it``. */ + FMT_CONSTEXPR void advance_to(iterator it) { + format_str_.remove_prefix(detail::to_unsigned(it - begin())); + } + + /** + Reports an error if using the manual argument indexing; otherwise returns + the next argument index and switches to the automatic indexing. + */ + FMT_CONSTEXPR auto next_arg_id() -> int { + if (next_arg_id_ < 0) { + detail::throw_format_error( + "cannot switch from manual to automatic argument indexing"); + return 0; + } + int id = next_arg_id_++; + do_check_arg_id(id); + return id; + } + + /** + Reports an error if using the automatic argument indexing; otherwise + switches to the manual indexing. + */ + FMT_CONSTEXPR void check_arg_id(int id) { + if (next_arg_id_ > 0) { + detail::throw_format_error( + "cannot switch from automatic to manual argument indexing"); + return; + } + next_arg_id_ = -1; + do_check_arg_id(id); + } + FMT_CONSTEXPR void check_arg_id(basic_string_view) {} + FMT_CONSTEXPR void check_dynamic_spec(int arg_id); +}; + +FMT_EXPORT +using format_parse_context = basic_format_parse_context; + +namespace detail { +// A parse context with extra data used only in compile-time checks. +template +class compile_parse_context : public basic_format_parse_context { + private: + int num_args_; + const type* types_; + using base = basic_format_parse_context; + + public: + explicit FMT_CONSTEXPR compile_parse_context( + basic_string_view format_str, int num_args, const type* types, + int next_arg_id = 0) + : base(format_str, next_arg_id), num_args_(num_args), types_(types) {} + + constexpr auto num_args() const -> int { return num_args_; } + constexpr auto arg_type(int id) const -> type { return types_[id]; } + + FMT_CONSTEXPR auto next_arg_id() -> int { + int id = base::next_arg_id(); + if (id >= num_args_) throw_format_error("argument not found"); + return id; + } + + FMT_CONSTEXPR void check_arg_id(int id) { + base::check_arg_id(id); + if (id >= num_args_) throw_format_error("argument not found"); + } + using base::check_arg_id; + + FMT_CONSTEXPR void check_dynamic_spec(int arg_id) { + detail::ignore_unused(arg_id); +#if !defined(__LCC__) + if (arg_id < num_args_ && types_ && !is_integral_type(types_[arg_id])) + throw_format_error("width/precision is not integer"); +#endif + } +}; + +// Extracts a reference to the container from back_insert_iterator. +template +inline auto get_container(std::back_insert_iterator it) + -> Container& { + using base = std::back_insert_iterator; + struct accessor : base { + accessor(base b) : base(b) {} + using base::container; + }; + return *accessor(it).container; +} + +template +FMT_CONSTEXPR auto copy_str(InputIt begin, InputIt end, OutputIt out) + -> OutputIt { + while (begin != end) *out++ = static_cast(*begin++); + return out; +} + +template , U>::value&& is_char::value)> +FMT_CONSTEXPR auto copy_str(T* begin, T* end, U* out) -> U* { + if (is_constant_evaluated()) return copy_str(begin, end, out); + auto size = to_unsigned(end - begin); + if (size > 0) memcpy(out, begin, size * sizeof(U)); + return out + size; +} + +/** + \rst + A contiguous memory buffer with an optional growing ability. It is an internal + class and shouldn't be used directly, only via `~fmt::basic_memory_buffer`. + \endrst + */ +template class buffer { + private: + T* ptr_; + size_t size_; + size_t capacity_; + + protected: + // Don't initialize ptr_ since it is not accessed to save a few cycles. + FMT_MSC_WARNING(suppress : 26495) + FMT_CONSTEXPR buffer(size_t sz) noexcept : size_(sz), capacity_(sz) {} + + FMT_CONSTEXPR20 buffer(T* p = nullptr, size_t sz = 0, size_t cap = 0) noexcept + : ptr_(p), size_(sz), capacity_(cap) {} + + FMT_CONSTEXPR20 ~buffer() = default; + buffer(buffer&&) = default; + + /** Sets the buffer data and capacity. */ + FMT_CONSTEXPR void set(T* buf_data, size_t buf_capacity) noexcept { + ptr_ = buf_data; + capacity_ = buf_capacity; + } + + /** Increases the buffer capacity to hold at least *capacity* elements. */ + // DEPRECATED! + virtual FMT_CONSTEXPR20 void grow(size_t capacity) = 0; + + public: + using value_type = T; + using const_reference = const T&; + + buffer(const buffer&) = delete; + void operator=(const buffer&) = delete; + + FMT_INLINE auto begin() noexcept -> T* { return ptr_; } + FMT_INLINE auto end() noexcept -> T* { return ptr_ + size_; } + + FMT_INLINE auto begin() const noexcept -> const T* { return ptr_; } + FMT_INLINE auto end() const noexcept -> const T* { return ptr_ + size_; } + + /** Returns the size of this buffer. */ + constexpr auto size() const noexcept -> size_t { return size_; } + + /** Returns the capacity of this buffer. */ + constexpr auto capacity() const noexcept -> size_t { return capacity_; } + + /** Returns a pointer to the buffer data (not null-terminated). */ + FMT_CONSTEXPR auto data() noexcept -> T* { return ptr_; } + FMT_CONSTEXPR auto data() const noexcept -> const T* { return ptr_; } + + /** Clears this buffer. */ + void clear() { size_ = 0; } + + // Tries resizing the buffer to contain *count* elements. If T is a POD type + // the new elements may not be initialized. + FMT_CONSTEXPR20 void try_resize(size_t count) { + try_reserve(count); + size_ = count <= capacity_ ? count : capacity_; + } + + // Tries increasing the buffer capacity to *new_capacity*. It can increase the + // capacity by a smaller amount than requested but guarantees there is space + // for at least one additional element either by increasing the capacity or by + // flushing the buffer if it is full. + FMT_CONSTEXPR20 void try_reserve(size_t new_capacity) { + if (new_capacity > capacity_) grow(new_capacity); + } + + FMT_CONSTEXPR20 void push_back(const T& value) { + try_reserve(size_ + 1); + ptr_[size_++] = value; + } + + /** Appends data to the end of the buffer. */ + template void append(const U* begin, const U* end); + + template FMT_CONSTEXPR auto operator[](Idx index) -> T& { + return ptr_[index]; + } + template + FMT_CONSTEXPR auto operator[](Idx index) const -> const T& { + return ptr_[index]; + } +}; + +struct buffer_traits { + explicit buffer_traits(size_t) {} + auto count() const -> size_t { return 0; } + auto limit(size_t size) -> size_t { return size; } +}; + +class fixed_buffer_traits { + private: + size_t count_ = 0; + size_t limit_; + + public: + explicit fixed_buffer_traits(size_t limit) : limit_(limit) {} + auto count() const -> size_t { return count_; } + auto limit(size_t size) -> size_t { + size_t n = limit_ > count_ ? limit_ - count_ : 0; + count_ += size; + return size < n ? size : n; + } +}; + +// A buffer that writes to an output iterator when flushed. +template +class iterator_buffer final : public Traits, public buffer { + private: + OutputIt out_; + enum { buffer_size = 256 }; + T data_[buffer_size]; + + protected: + FMT_CONSTEXPR20 void grow(size_t) override { + if (this->size() == buffer_size) flush(); + } + + void flush() { + auto size = this->size(); + this->clear(); + out_ = copy_str(data_, data_ + this->limit(size), out_); + } + + public: + explicit iterator_buffer(OutputIt out, size_t n = buffer_size) + : Traits(n), buffer(data_, 0, buffer_size), out_(out) {} + iterator_buffer(iterator_buffer&& other) + : Traits(other), buffer(data_, 0, buffer_size), out_(other.out_) {} + ~iterator_buffer() { flush(); } + + auto out() -> OutputIt { + flush(); + return out_; + } + auto count() const -> size_t { return Traits::count() + this->size(); } +}; + +template +class iterator_buffer final + : public fixed_buffer_traits, + public buffer { + private: + T* out_; + enum { buffer_size = 256 }; + T data_[buffer_size]; + + protected: + FMT_CONSTEXPR20 void grow(size_t) override { + if (this->size() == this->capacity()) flush(); + } + + void flush() { + size_t n = this->limit(this->size()); + if (this->data() == out_) { + out_ += n; + this->set(data_, buffer_size); + } + this->clear(); + } + + public: + explicit iterator_buffer(T* out, size_t n = buffer_size) + : fixed_buffer_traits(n), buffer(out, 0, n), out_(out) {} + iterator_buffer(iterator_buffer&& other) + : fixed_buffer_traits(other), + buffer(std::move(other)), + out_(other.out_) { + if (this->data() != out_) { + this->set(data_, buffer_size); + this->clear(); + } + } + ~iterator_buffer() { flush(); } + + auto out() -> T* { + flush(); + return out_; + } + auto count() const -> size_t { + return fixed_buffer_traits::count() + this->size(); + } +}; + +template class iterator_buffer final : public buffer { + protected: + FMT_CONSTEXPR20 void grow(size_t) override {} + + public: + explicit iterator_buffer(T* out, size_t = 0) : buffer(out, 0, ~size_t()) {} + + auto out() -> T* { return &*this->end(); } +}; + +// A buffer that writes to a container with the contiguous storage. +template +class iterator_buffer, + enable_if_t::value, + typename Container::value_type>> + final : public buffer { + private: + Container& container_; + + protected: + FMT_CONSTEXPR20 void grow(size_t capacity) override { + container_.resize(capacity); + this->set(&container_[0], capacity); + } + + public: + explicit iterator_buffer(Container& c) + : buffer(c.size()), container_(c) {} + explicit iterator_buffer(std::back_insert_iterator out, size_t = 0) + : iterator_buffer(get_container(out)) {} + + auto out() -> std::back_insert_iterator { + return std::back_inserter(container_); + } +}; + +// A buffer that counts the number of code units written discarding the output. +template class counting_buffer final : public buffer { + private: + enum { buffer_size = 256 }; + T data_[buffer_size]; + size_t count_ = 0; + + protected: + FMT_CONSTEXPR20 void grow(size_t) override { + if (this->size() != buffer_size) return; + count_ += this->size(); + this->clear(); + } + + public: + counting_buffer() : buffer(data_, 0, buffer_size) {} + + auto count() -> size_t { return count_ + this->size(); } +}; +} // namespace detail + +template +FMT_CONSTEXPR void basic_format_parse_context::do_check_arg_id(int id) { + // Argument id is only checked at compile-time during parsing because + // formatting has its own validation. + if (detail::is_constant_evaluated() && + (!FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200)) { + using context = detail::compile_parse_context; + if (id >= static_cast(this)->num_args()) + detail::throw_format_error("argument not found"); + } +} + +template +FMT_CONSTEXPR void basic_format_parse_context::check_dynamic_spec( + int arg_id) { + if (detail::is_constant_evaluated() && + (!FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200)) { + using context = detail::compile_parse_context; + static_cast(this)->check_dynamic_spec(arg_id); + } +} + +FMT_EXPORT template class basic_format_arg; +FMT_EXPORT template class basic_format_args; +FMT_EXPORT template class dynamic_format_arg_store; + +// A formatter for objects of type T. +FMT_EXPORT +template +struct formatter { + // A deleted default constructor indicates a disabled formatter. + formatter() = delete; +}; + +// Specifies if T has an enabled formatter specialization. A type can be +// formattable even if it doesn't have a formatter e.g. via a conversion. +template +using has_formatter = + std::is_constructible>; + +// An output iterator that appends to a buffer. +// It is used to reduce symbol sizes for the common case. +class appender : public std::back_insert_iterator> { + using base = std::back_insert_iterator>; + + public: + using std::back_insert_iterator>::back_insert_iterator; + appender(base it) noexcept : base(it) {} + FMT_UNCHECKED_ITERATOR(appender); + + auto operator++() noexcept -> appender& { return *this; } + auto operator++(int) noexcept -> appender { return *this; } +}; + +namespace detail { + +template +constexpr auto has_const_formatter_impl(T*) + -> decltype(typename Context::template formatter_type().format( + std::declval(), std::declval()), + true) { + return true; +} +template +constexpr auto has_const_formatter_impl(...) -> bool { + return false; +} +template +constexpr auto has_const_formatter() -> bool { + return has_const_formatter_impl(static_cast(nullptr)); +} + +template +using buffer_appender = conditional_t::value, appender, + std::back_insert_iterator>>; + +// Maps an output iterator to a buffer. +template +auto get_buffer(OutputIt out) -> iterator_buffer { + return iterator_buffer(out); +} +template , Buf>::value)> +auto get_buffer(std::back_insert_iterator out) -> buffer& { + return get_container(out); +} + +template +FMT_INLINE auto get_iterator(Buf& buf, OutputIt) -> decltype(buf.out()) { + return buf.out(); +} +template +auto get_iterator(buffer&, OutputIt out) -> OutputIt { + return out; +} + +struct view {}; + +template struct named_arg : view { + const Char* name; + const T& value; + named_arg(const Char* n, const T& v) : name(n), value(v) {} +}; + +template struct named_arg_info { + const Char* name; + int id; +}; + +template +struct arg_data { + // args_[0].named_args points to named_args_ to avoid bloating format_args. + // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning. + T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : +1)]; + named_arg_info named_args_[NUM_NAMED_ARGS]; + + template + arg_data(const U&... init) : args_{T(named_args_, NUM_NAMED_ARGS), init...} {} + arg_data(const arg_data& other) = delete; + auto args() const -> const T* { return args_ + 1; } + auto named_args() -> named_arg_info* { return named_args_; } +}; + +template +struct arg_data { + // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning. + T args_[NUM_ARGS != 0 ? NUM_ARGS : +1]; + + template + FMT_CONSTEXPR FMT_INLINE arg_data(const U&... init) : args_{init...} {} + FMT_CONSTEXPR FMT_INLINE auto args() const -> const T* { return args_; } + FMT_CONSTEXPR FMT_INLINE auto named_args() -> std::nullptr_t { + return nullptr; + } +}; + +template +inline void init_named_args(named_arg_info*, int, int) {} + +template struct is_named_arg : std::false_type {}; +template struct is_statically_named_arg : std::false_type {}; + +template +struct is_named_arg> : std::true_type {}; + +template ::value)> +void init_named_args(named_arg_info* named_args, int arg_count, + int named_arg_count, const T&, const Tail&... args) { + init_named_args(named_args, arg_count + 1, named_arg_count, args...); +} + +template ::value)> +void init_named_args(named_arg_info* named_args, int arg_count, + int named_arg_count, const T& arg, const Tail&... args) { + named_args[named_arg_count++] = {arg.name, arg_count}; + init_named_args(named_args, arg_count + 1, named_arg_count, args...); +} + +template +FMT_CONSTEXPR FMT_INLINE void init_named_args(std::nullptr_t, int, int, + const Args&...) {} + +template constexpr auto count() -> size_t { return B ? 1 : 0; } +template constexpr auto count() -> size_t { + return (B1 ? 1 : 0) + count(); +} + +template constexpr auto count_named_args() -> size_t { + return count::value...>(); +} + +template +constexpr auto count_statically_named_args() -> size_t { + return count::value...>(); +} + +struct unformattable {}; +struct unformattable_char : unformattable {}; +struct unformattable_pointer : unformattable {}; + +template struct string_value { + const Char* data; + size_t size; +}; + +template struct named_arg_value { + const named_arg_info* data; + size_t size; +}; + +template struct custom_value { + using parse_context = typename Context::parse_context_type; + void* value; + void (*format)(void* arg, parse_context& parse_ctx, Context& ctx); +}; + +// A formatting argument value. +template class value { + public: + using char_type = typename Context::char_type; + + union { + monostate no_value; + int int_value; + unsigned uint_value; + long long long_long_value; + unsigned long long ulong_long_value; + int128_opt int128_value; + uint128_opt uint128_value; + bool bool_value; + char_type char_value; + float float_value; + double double_value; + long double long_double_value; + const void* pointer; + string_value string; + custom_value custom; + named_arg_value named_args; + }; + + constexpr FMT_INLINE value() : no_value() {} + constexpr FMT_INLINE value(int val) : int_value(val) {} + constexpr FMT_INLINE value(unsigned val) : uint_value(val) {} + constexpr FMT_INLINE value(long long val) : long_long_value(val) {} + constexpr FMT_INLINE value(unsigned long long val) : ulong_long_value(val) {} + FMT_INLINE value(int128_opt val) : int128_value(val) {} + FMT_INLINE value(uint128_opt val) : uint128_value(val) {} + constexpr FMT_INLINE value(float val) : float_value(val) {} + constexpr FMT_INLINE value(double val) : double_value(val) {} + FMT_INLINE value(long double val) : long_double_value(val) {} + constexpr FMT_INLINE value(bool val) : bool_value(val) {} + constexpr FMT_INLINE value(char_type val) : char_value(val) {} + FMT_CONSTEXPR FMT_INLINE value(const char_type* val) { + string.data = val; + if (is_constant_evaluated()) string.size = {}; + } + FMT_CONSTEXPR FMT_INLINE value(basic_string_view val) { + string.data = val.data(); + string.size = val.size(); + } + FMT_INLINE value(const void* val) : pointer(val) {} + FMT_INLINE value(const named_arg_info* args, size_t size) + : named_args{args, size} {} + + template FMT_CONSTEXPR20 FMT_INLINE value(T& val) { + using value_type = remove_const_t; + custom.value = const_cast(std::addressof(val)); + // Get the formatter type through the context to allow different contexts + // have different extension points, e.g. `formatter` for `format` and + // `printf_formatter` for `printf`. + custom.format = format_custom_arg< + value_type, typename Context::template formatter_type>; + } + value(unformattable); + value(unformattable_char); + value(unformattable_pointer); + + private: + // Formats an argument of a custom type, such as a user-defined class. + template + static void format_custom_arg(void* arg, + typename Context::parse_context_type& parse_ctx, + Context& ctx) { + auto f = Formatter(); + parse_ctx.advance_to(f.parse(parse_ctx)); + using qualified_type = + conditional_t(), const T, T>; + // Calling format through a mutable reference is deprecated. + ctx.advance_to(f.format(*static_cast(arg), ctx)); + } +}; + +// To minimize the number of types we need to deal with, long is translated +// either to int or to long long depending on its size. +enum { long_short = sizeof(long) == sizeof(int) }; +using long_type = conditional_t; +using ulong_type = conditional_t; + +template struct format_as_result { + template ::value || std::is_class::value)> + static auto map(U*) -> remove_cvref_t()))>; + static auto map(...) -> void; + + using type = decltype(map(static_cast(nullptr))); +}; +template using format_as_t = typename format_as_result::type; + +template +struct has_format_as + : bool_constant, void>::value> {}; + +// Maps formatting arguments to core types. +// arg_mapper reports errors by returning unformattable instead of using +// static_assert because it's used in the is_formattable trait. +template struct arg_mapper { + using char_type = typename Context::char_type; + + FMT_CONSTEXPR FMT_INLINE auto map(signed char val) -> int { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(unsigned char val) -> unsigned { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(short val) -> int { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(unsigned short val) -> unsigned { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(int val) -> int { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(unsigned val) -> unsigned { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(long val) -> long_type { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(unsigned long val) -> ulong_type { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(long long val) -> long long { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(unsigned long long val) + -> unsigned long long { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(int128_opt val) -> int128_opt { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(uint128_opt val) -> uint128_opt { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(bool val) -> bool { return val; } + + template ::value || + std::is_same::value)> + FMT_CONSTEXPR FMT_INLINE auto map(T val) -> char_type { + return val; + } + template ::value || +#ifdef __cpp_char8_t + std::is_same::value || +#endif + std::is_same::value || + std::is_same::value) && + !std::is_same::value, + int> = 0> + FMT_CONSTEXPR FMT_INLINE auto map(T) -> unformattable_char { + return {}; + } + + FMT_CONSTEXPR FMT_INLINE auto map(float val) -> float { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(double val) -> double { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(long double val) -> long double { + return val; + } + + FMT_CONSTEXPR FMT_INLINE auto map(char_type* val) -> const char_type* { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(const char_type* val) -> const char_type* { + return val; + } + template ::value && !std::is_pointer::value && + std::is_same>::value)> + FMT_CONSTEXPR FMT_INLINE auto map(const T& val) + -> basic_string_view { + return to_string_view(val); + } + template ::value && !std::is_pointer::value && + !std::is_same>::value)> + FMT_CONSTEXPR FMT_INLINE auto map(const T&) -> unformattable_char { + return {}; + } + + FMT_CONSTEXPR FMT_INLINE auto map(void* val) -> const void* { return val; } + FMT_CONSTEXPR FMT_INLINE auto map(const void* val) -> const void* { + return val; + } + FMT_CONSTEXPR FMT_INLINE auto map(std::nullptr_t val) -> const void* { + return val; + } + + // Use SFINAE instead of a const T* parameter to avoid a conflict with the + // array overload. + template < + typename T, + FMT_ENABLE_IF( + std::is_pointer::value || std::is_member_pointer::value || + std::is_function::type>::value || + (std::is_array::value && + !std::is_convertible::value))> + FMT_CONSTEXPR auto map(const T&) -> unformattable_pointer { + return {}; + } + + template ::value)> + FMT_CONSTEXPR FMT_INLINE auto map(const T (&values)[N]) -> const T (&)[N] { + return values; + } + + // Only map owning types because mapping views can be unsafe. + template , + FMT_ENABLE_IF(std::is_arithmetic::value)> + FMT_CONSTEXPR FMT_INLINE auto map(const T& val) + -> decltype(FMT_DECLTYPE_THIS map(U())) { + return map(format_as(val)); + } + + template > + struct formattable : bool_constant() || + (has_formatter::value && + !std::is_const::value)> {}; + + template ::value)> + FMT_CONSTEXPR FMT_INLINE auto do_map(T& val) -> T& { + return val; + } + template ::value)> + FMT_CONSTEXPR FMT_INLINE auto do_map(T&) -> unformattable { + return {}; + } + + template , + FMT_ENABLE_IF((std::is_class::value || std::is_enum::value || + std::is_union::value) && + !is_string::value && !is_char::value && + !is_named_arg::value && + !std::is_arithmetic>::value)> + FMT_CONSTEXPR FMT_INLINE auto map(T& val) + -> decltype(FMT_DECLTYPE_THIS do_map(val)) { + return do_map(val); + } + + template ::value)> + FMT_CONSTEXPR FMT_INLINE auto map(const T& named_arg) + -> decltype(FMT_DECLTYPE_THIS map(named_arg.value)) { + return map(named_arg.value); + } + + auto map(...) -> unformattable { return {}; } +}; + +// A type constant after applying arg_mapper. +template +using mapped_type_constant = + type_constant().map(std::declval())), + typename Context::char_type>; + +enum { packed_arg_bits = 4 }; +// Maximum number of arguments with packed types. +enum { max_packed_args = 62 / packed_arg_bits }; +enum : unsigned long long { is_unpacked_bit = 1ULL << 63 }; +enum : unsigned long long { has_named_args_bit = 1ULL << 62 }; + +template +auto copy_str(InputIt begin, InputIt end, appender out) -> appender { + get_container(out).append(begin, end); + return out; +} +template +auto copy_str(InputIt begin, InputIt end, + std::back_insert_iterator out) + -> std::back_insert_iterator { + get_container(out).append(begin, end); + return out; +} + +template +FMT_CONSTEXPR auto copy_str(R&& rng, OutputIt out) -> OutputIt { + return detail::copy_str(rng.begin(), rng.end(), out); +} + +#if FMT_GCC_VERSION && FMT_GCC_VERSION < 500 +// A workaround for gcc 4.8 to make void_t work in a SFINAE context. +template struct void_t_impl { + using type = void; +}; +template using void_t = typename void_t_impl::type; +#else +template using void_t = void; +#endif + +template +struct is_output_iterator : std::false_type {}; + +template +struct is_output_iterator< + It, T, + void_t::iterator_category, + decltype(*std::declval() = std::declval())>> + : std::true_type {}; + +template struct is_back_insert_iterator : std::false_type {}; +template +struct is_back_insert_iterator> + : std::true_type {}; + +// A type-erased reference to an std::locale to avoid a heavy include. +class locale_ref { + private: + const void* locale_; // A type-erased pointer to std::locale. + + public: + constexpr FMT_INLINE locale_ref() : locale_(nullptr) {} + template explicit locale_ref(const Locale& loc); + + explicit operator bool() const noexcept { return locale_ != nullptr; } + + template auto get() const -> Locale; +}; + +template constexpr auto encode_types() -> unsigned long long { + return 0; +} + +template +constexpr auto encode_types() -> unsigned long long { + return static_cast(mapped_type_constant::value) | + (encode_types() << packed_arg_bits); +} + +#if defined(__cpp_if_constexpr) +// This type is intentionally undefined, only used for errors +template struct type_is_unformattable_for; +#endif + +template +FMT_CONSTEXPR FMT_INLINE auto make_arg(T& val) -> value { + using arg_type = remove_cvref_t().map(val))>; + + constexpr bool formattable_char = + !std::is_same::value; + static_assert(formattable_char, "Mixing character types is disallowed."); + + // Formatting of arbitrary pointers is disallowed. If you want to format a + // pointer cast it to `void*` or `const void*`. In particular, this forbids + // formatting of `[const] volatile char*` printed as bool by iostreams. + constexpr bool formattable_pointer = + !std::is_same::value; + static_assert(formattable_pointer, + "Formatting of non-void pointers is disallowed."); + + constexpr bool formattable = !std::is_same::value; +#if defined(__cpp_if_constexpr) + if constexpr (!formattable) { + type_is_unformattable_for _; + } +#endif + static_assert( + formattable, + "Cannot format an argument. To make type T formattable provide a " + "formatter specialization: https://fmt.dev/latest/api.html#udt"); + return {arg_mapper().map(val)}; +} + +template +FMT_CONSTEXPR auto make_arg(T& val) -> basic_format_arg { + auto arg = basic_format_arg(); + arg.type_ = mapped_type_constant::value; + arg.value_ = make_arg(val); + return arg; +} + +template +FMT_CONSTEXPR inline auto make_arg(T& val) -> basic_format_arg { + return make_arg(val); +} +} // namespace detail +FMT_BEGIN_EXPORT + +// A formatting argument. Context is a template parameter for the compiled API +// where output can be unbuffered. +template class basic_format_arg { + private: + detail::value value_; + detail::type type_; + + template + friend FMT_CONSTEXPR auto detail::make_arg(T& value) + -> basic_format_arg; + + template + friend FMT_CONSTEXPR auto visit_format_arg(Visitor&& vis, + const basic_format_arg& arg) + -> decltype(vis(0)); + + friend class basic_format_args; + friend class dynamic_format_arg_store; + + using char_type = typename Context::char_type; + + template + friend struct detail::arg_data; + + basic_format_arg(const detail::named_arg_info* args, size_t size) + : value_(args, size) {} + + public: + class handle { + public: + explicit handle(detail::custom_value custom) : custom_(custom) {} + + void format(typename Context::parse_context_type& parse_ctx, + Context& ctx) const { + custom_.format(custom_.value, parse_ctx, ctx); + } + + private: + detail::custom_value custom_; + }; + + constexpr basic_format_arg() : type_(detail::type::none_type) {} + + constexpr explicit operator bool() const noexcept { + return type_ != detail::type::none_type; + } + + auto type() const -> detail::type { return type_; } + + auto is_integral() const -> bool { return detail::is_integral_type(type_); } + auto is_arithmetic() const -> bool { + return detail::is_arithmetic_type(type_); + } + + FMT_INLINE auto format_custom(const char_type* parse_begin, + typename Context::parse_context_type& parse_ctx, + Context& ctx) -> bool { + if (type_ != detail::type::custom_type) return false; + parse_ctx.advance_to(parse_begin); + value_.custom.format(value_.custom.value, parse_ctx, ctx); + return true; + } +}; + +/** + \rst + Visits an argument dispatching to the appropriate visit method based on + the argument type. For example, if the argument type is ``double`` then + ``vis(value)`` will be called with the value of type ``double``. + \endrst + */ +// DEPRECATED! +template +FMT_CONSTEXPR FMT_INLINE auto visit_format_arg( + Visitor&& vis, const basic_format_arg& arg) -> decltype(vis(0)) { + switch (arg.type_) { + case detail::type::none_type: + break; + case detail::type::int_type: + return vis(arg.value_.int_value); + case detail::type::uint_type: + return vis(arg.value_.uint_value); + case detail::type::long_long_type: + return vis(arg.value_.long_long_value); + case detail::type::ulong_long_type: + return vis(arg.value_.ulong_long_value); + case detail::type::int128_type: + return vis(detail::convert_for_visit(arg.value_.int128_value)); + case detail::type::uint128_type: + return vis(detail::convert_for_visit(arg.value_.uint128_value)); + case detail::type::bool_type: + return vis(arg.value_.bool_value); + case detail::type::char_type: + return vis(arg.value_.char_value); + case detail::type::float_type: + return vis(arg.value_.float_value); + case detail::type::double_type: + return vis(arg.value_.double_value); + case detail::type::long_double_type: + return vis(arg.value_.long_double_value); + case detail::type::cstring_type: + return vis(arg.value_.string.data); + case detail::type::string_type: + using sv = basic_string_view; + return vis(sv(arg.value_.string.data, arg.value_.string.size)); + case detail::type::pointer_type: + return vis(arg.value_.pointer); + case detail::type::custom_type: + return vis(typename basic_format_arg::handle(arg.value_.custom)); + } + return vis(monostate()); +} + +// Formatting context. +template class basic_format_context { + private: + OutputIt out_; + basic_format_args args_; + detail::locale_ref loc_; + + public: + using iterator = OutputIt; + using format_arg = basic_format_arg; + using format_args = basic_format_args; + using parse_context_type = basic_format_parse_context; + template using formatter_type = formatter; + + /** The character type for the output. */ + using char_type = Char; + + basic_format_context(basic_format_context&&) = default; + basic_format_context(const basic_format_context&) = delete; + void operator=(const basic_format_context&) = delete; + /** + Constructs a ``basic_format_context`` object. References to the arguments + are stored in the object so make sure they have appropriate lifetimes. + */ + constexpr basic_format_context(OutputIt out, format_args ctx_args, + detail::locale_ref loc = {}) + : out_(out), args_(ctx_args), loc_(loc) {} + + constexpr auto arg(int id) const -> format_arg { return args_.get(id); } + FMT_CONSTEXPR auto arg(basic_string_view name) -> format_arg { + return args_.get(name); + } + FMT_CONSTEXPR auto arg_id(basic_string_view name) -> int { + return args_.get_id(name); + } + auto args() const -> const format_args& { return args_; } + + // DEPRECATED! + FMT_CONSTEXPR auto error_handler() -> detail::error_handler { return {}; } + void on_error(const char* message) { error_handler().on_error(message); } + + // Returns an iterator to the beginning of the output range. + FMT_CONSTEXPR auto out() -> iterator { return out_; } + + // Advances the begin iterator to ``it``. + void advance_to(iterator it) { + if (!detail::is_back_insert_iterator()) out_ = it; + } + + FMT_CONSTEXPR auto locale() -> detail::locale_ref { return loc_; } +}; + +template +using buffer_context = + basic_format_context, Char>; +using format_context = buffer_context; + +template +using is_formattable = bool_constant>() + .map(std::declval()))>::value>; + +/** + \rst + An array of references to arguments. It can be implicitly converted into + `~fmt::basic_format_args` for passing into type-erased formatting functions + such as `~fmt::vformat`. + \endrst + */ +template +class format_arg_store +#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 + // Workaround a GCC template argument substitution bug. + : public basic_format_args +#endif +{ + private: + static const size_t num_args = sizeof...(Args); + static constexpr size_t num_named_args = detail::count_named_args(); + static const bool is_packed = num_args <= detail::max_packed_args; + + using value_type = conditional_t, + basic_format_arg>; + + detail::arg_data + data_; + + friend class basic_format_args; + + static constexpr unsigned long long desc = + (is_packed ? detail::encode_types() + : detail::is_unpacked_bit | num_args) | + (num_named_args != 0 + ? static_cast(detail::has_named_args_bit) + : 0); + + public: + template + FMT_CONSTEXPR FMT_INLINE format_arg_store(T&... args) + : +#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 + basic_format_args(*this), +#endif + data_{detail::make_arg(args)...} { + if (detail::const_check(num_named_args != 0)) + detail::init_named_args(data_.named_args(), 0, 0, args...); + } +}; + +/** + \rst + Constructs a `~fmt::format_arg_store` object that contains references to + arguments and can be implicitly converted to `~fmt::format_args`. `Context` + can be omitted in which case it defaults to `~fmt::format_context`. + See `~fmt::arg` for lifetime considerations. + \endrst + */ +// Arguments are taken by lvalue references to avoid some lifetime issues. +template +constexpr auto make_format_args(T&... args) + -> format_arg_store...> { + return {args...}; +} + +/** + \rst + Returns a named argument to be used in a formatting function. + It should only be used in a call to a formatting function or + `dynamic_format_arg_store::push_back`. + + **Example**:: + + fmt::print("Elapsed time: {s:.2f} seconds", fmt::arg("s", 1.23)); + \endrst + */ +template +inline auto arg(const Char* name, const T& arg) -> detail::named_arg { + static_assert(!detail::is_named_arg(), "nested named arguments"); + return {name, arg}; +} +FMT_END_EXPORT + +/** + \rst + A view of a collection of formatting arguments. To avoid lifetime issues it + should only be used as a parameter type in type-erased functions such as + ``vformat``:: + + void vlog(string_view format_str, format_args args); // OK + format_args args = make_format_args(); // Error: dangling reference + \endrst + */ +template class basic_format_args { + public: + using size_type = int; + using format_arg = basic_format_arg; + + private: + // A descriptor that contains information about formatting arguments. + // If the number of arguments is less or equal to max_packed_args then + // argument types are passed in the descriptor. This reduces binary code size + // per formatting function call. + unsigned long long desc_; + union { + // If is_packed() returns true then argument values are stored in values_; + // otherwise they are stored in args_. This is done to improve cache + // locality and reduce compiled code size since storing larger objects + // may require more code (at least on x86-64) even if the same amount of + // data is actually copied to stack. It saves ~10% on the bloat test. + const detail::value* values_; + const format_arg* args_; + }; + + constexpr auto is_packed() const -> bool { + return (desc_ & detail::is_unpacked_bit) == 0; + } + auto has_named_args() const -> bool { + return (desc_ & detail::has_named_args_bit) != 0; + } + + FMT_CONSTEXPR auto type(int index) const -> detail::type { + int shift = index * detail::packed_arg_bits; + unsigned int mask = (1 << detail::packed_arg_bits) - 1; + return static_cast((desc_ >> shift) & mask); + } + + constexpr FMT_INLINE basic_format_args(unsigned long long desc, + const detail::value* values) + : desc_(desc), values_(values) {} + constexpr basic_format_args(unsigned long long desc, const format_arg* args) + : desc_(desc), args_(args) {} + + public: + constexpr basic_format_args() : desc_(0), args_(nullptr) {} + + /** + \rst + Constructs a `basic_format_args` object from `~fmt::format_arg_store`. + \endrst + */ + template + constexpr FMT_INLINE basic_format_args( + const format_arg_store& store) + : basic_format_args(format_arg_store::desc, + store.data_.args()) {} + + /** + \rst + Constructs a `basic_format_args` object from + `~fmt::dynamic_format_arg_store`. + \endrst + */ + constexpr FMT_INLINE basic_format_args( + const dynamic_format_arg_store& store) + : basic_format_args(store.get_types(), store.data()) {} + + /** + \rst + Constructs a `basic_format_args` object from a dynamic set of arguments. + \endrst + */ + constexpr basic_format_args(const format_arg* args, int count) + : basic_format_args(detail::is_unpacked_bit | detail::to_unsigned(count), + args) {} + + /** Returns the argument with the specified id. */ + FMT_CONSTEXPR auto get(int id) const -> format_arg { + format_arg arg; + if (!is_packed()) { + if (id < max_size()) arg = args_[id]; + return arg; + } + if (id >= detail::max_packed_args) return arg; + arg.type_ = type(id); + if (arg.type_ == detail::type::none_type) return arg; + arg.value_ = values_[id]; + return arg; + } + + template + auto get(basic_string_view name) const -> format_arg { + int id = get_id(name); + return id >= 0 ? get(id) : format_arg(); + } + + template + auto get_id(basic_string_view name) const -> int { + if (!has_named_args()) return -1; + const auto& named_args = + (is_packed() ? values_[-1] : args_[-1].value_).named_args; + for (size_t i = 0; i < named_args.size; ++i) { + if (named_args.data[i].name == name) return named_args.data[i].id; + } + return -1; + } + + auto max_size() const -> int { + unsigned long long max_packed = detail::max_packed_args; + return static_cast(is_packed() ? max_packed + : desc_ & ~detail::is_unpacked_bit); + } +}; + +/** An alias to ``basic_format_args``. */ +// A separate type would result in shorter symbols but break ABI compatibility +// between clang and gcc on ARM (#1919). +FMT_EXPORT using format_args = basic_format_args; + +// We cannot use enum classes as bit fields because of a gcc bug, so we put them +// in namespaces instead (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414). +// Additionally, if an underlying type is specified, older gcc incorrectly warns +// that the type is too small. Both bugs are fixed in gcc 9.3. +#if FMT_GCC_VERSION && FMT_GCC_VERSION < 903 +# define FMT_ENUM_UNDERLYING_TYPE(type) +#else +# define FMT_ENUM_UNDERLYING_TYPE(type) : type +#endif +namespace align { +enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, left, right, center, + numeric}; +} +using align_t = align::type; +namespace sign { +enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, minus, plus, space}; +} +using sign_t = sign::type; + +namespace detail { + +// Workaround an array initialization issue in gcc 4.8. +template struct fill_t { + private: + enum { max_size = 4 }; + Char data_[max_size] = {Char(' '), Char(0), Char(0), Char(0)}; + unsigned char size_ = 1; + + public: + FMT_CONSTEXPR void operator=(basic_string_view s) { + auto size = s.size(); + FMT_ASSERT(size <= max_size, "invalid fill"); + for (size_t i = 0; i < size; ++i) data_[i] = s[i]; + size_ = static_cast(size); + } + + constexpr auto size() const -> size_t { return size_; } + constexpr auto data() const -> const Char* { return data_; } + + FMT_CONSTEXPR auto operator[](size_t index) -> Char& { return data_[index]; } + FMT_CONSTEXPR auto operator[](size_t index) const -> const Char& { + return data_[index]; + } +}; +} // namespace detail + +enum class presentation_type : unsigned char { + none, + dec, // 'd' + oct, // 'o' + hex_lower, // 'x' + hex_upper, // 'X' + bin_lower, // 'b' + bin_upper, // 'B' + hexfloat_lower, // 'a' + hexfloat_upper, // 'A' + exp_lower, // 'e' + exp_upper, // 'E' + fixed_lower, // 'f' + fixed_upper, // 'F' + general_lower, // 'g' + general_upper, // 'G' + chr, // 'c' + string, // 's' + pointer, // 'p' + debug // '?' +}; + +// Format specifiers for built-in and string types. +template struct format_specs { + int width; + int precision; + presentation_type type; + align_t align : 4; + sign_t sign : 3; + bool alt : 1; // Alternate form ('#'). + bool localized : 1; + detail::fill_t fill; + + constexpr format_specs() + : width(0), + precision(-1), + type(presentation_type::none), + align(align::none), + sign(sign::none), + alt(false), + localized(false) {} +}; + +namespace detail { + +enum class arg_id_kind { none, index, name }; + +// An argument reference. +template struct arg_ref { + FMT_CONSTEXPR arg_ref() : kind(arg_id_kind::none), val() {} + + FMT_CONSTEXPR explicit arg_ref(int index) + : kind(arg_id_kind::index), val(index) {} + FMT_CONSTEXPR explicit arg_ref(basic_string_view name) + : kind(arg_id_kind::name), val(name) {} + + FMT_CONSTEXPR auto operator=(int idx) -> arg_ref& { + kind = arg_id_kind::index; + val.index = idx; + return *this; + } + + arg_id_kind kind; + union value { + FMT_CONSTEXPR value(int idx = 0) : index(idx) {} + FMT_CONSTEXPR value(basic_string_view n) : name(n) {} + + int index; + basic_string_view name; + } val; +}; + +// Format specifiers with width and precision resolved at formatting rather +// than parsing time to allow reusing the same parsed specifiers with +// different sets of arguments (precompilation of format strings). +template +struct dynamic_format_specs : format_specs { + arg_ref width_ref; + arg_ref precision_ref; +}; + +// Converts a character to ASCII. Returns '\0' on conversion failure. +template ::value)> +constexpr auto to_ascii(Char c) -> char { + return c <= 0xff ? static_cast(c) : '\0'; +} +template ::value)> +constexpr auto to_ascii(Char c) -> char { + return c <= 0xff ? static_cast(c) : '\0'; +} + +// Returns the number of code units in a code point or 1 on error. +template +FMT_CONSTEXPR auto code_point_length(const Char* begin) -> int { + if (const_check(sizeof(Char) != 1)) return 1; + auto c = static_cast(*begin); + return static_cast((0x3a55000000000000ull >> (2 * (c >> 3))) & 0x3) + 1; +} + +// Return the result via the out param to workaround gcc bug 77539. +template +FMT_CONSTEXPR auto find(Ptr first, Ptr last, T value, Ptr& out) -> bool { + for (out = first; out != last; ++out) { + if (*out == value) return true; + } + return false; +} + +template <> +inline auto find(const char* first, const char* last, char value, + const char*& out) -> bool { + out = static_cast( + std::memchr(first, value, to_unsigned(last - first))); + return out != nullptr; +} + +// Parses the range [begin, end) as an unsigned integer. This function assumes +// that the range is non-empty and the first character is a digit. +template +FMT_CONSTEXPR auto parse_nonnegative_int(const Char*& begin, const Char* end, + int error_value) noexcept -> int { + FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', ""); + unsigned value = 0, prev = 0; + auto p = begin; + do { + prev = value; + value = value * 10 + unsigned(*p - '0'); + ++p; + } while (p != end && '0' <= *p && *p <= '9'); + auto num_digits = p - begin; + begin = p; + if (num_digits <= std::numeric_limits::digits10) + return static_cast(value); + // Check for overflow. + const unsigned max = to_unsigned((std::numeric_limits::max)()); + return num_digits == std::numeric_limits::digits10 + 1 && + prev * 10ull + unsigned(p[-1] - '0') <= max + ? static_cast(value) + : error_value; +} + +FMT_CONSTEXPR inline auto parse_align(char c) -> align_t { + switch (c) { + case '<': + return align::left; + case '>': + return align::right; + case '^': + return align::center; + } + return align::none; +} + +template constexpr auto is_name_start(Char c) -> bool { + return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || c == '_'; +} + +template +FMT_CONSTEXPR auto do_parse_arg_id(const Char* begin, const Char* end, + Handler&& handler) -> const Char* { + Char c = *begin; + if (c >= '0' && c <= '9') { + int index = 0; + constexpr int max = (std::numeric_limits::max)(); + if (c != '0') + index = parse_nonnegative_int(begin, end, max); + else + ++begin; + if (begin == end || (*begin != '}' && *begin != ':')) + throw_format_error("invalid format string"); + else + handler.on_index(index); + return begin; + } + if (!is_name_start(c)) { + throw_format_error("invalid format string"); + return begin; + } + auto it = begin; + do { + ++it; + } while (it != end && (is_name_start(*it) || ('0' <= *it && *it <= '9'))); + handler.on_name({begin, to_unsigned(it - begin)}); + return it; +} + +template +FMT_CONSTEXPR FMT_INLINE auto parse_arg_id(const Char* begin, const Char* end, + Handler&& handler) -> const Char* { + FMT_ASSERT(begin != end, ""); + Char c = *begin; + if (c != '}' && c != ':') return do_parse_arg_id(begin, end, handler); + handler.on_auto(); + return begin; +} + +template struct dynamic_spec_id_handler { + basic_format_parse_context& ctx; + arg_ref& ref; + + FMT_CONSTEXPR void on_auto() { + int id = ctx.next_arg_id(); + ref = arg_ref(id); + ctx.check_dynamic_spec(id); + } + FMT_CONSTEXPR void on_index(int id) { + ref = arg_ref(id); + ctx.check_arg_id(id); + ctx.check_dynamic_spec(id); + } + FMT_CONSTEXPR void on_name(basic_string_view id) { + ref = arg_ref(id); + ctx.check_arg_id(id); + } +}; + +// Parses [integer | "{" [arg_id] "}"]. +template +FMT_CONSTEXPR auto parse_dynamic_spec(const Char* begin, const Char* end, + int& value, arg_ref& ref, + basic_format_parse_context& ctx) + -> const Char* { + FMT_ASSERT(begin != end, ""); + if ('0' <= *begin && *begin <= '9') { + int val = parse_nonnegative_int(begin, end, -1); + if (val != -1) + value = val; + else + throw_format_error("number is too big"); + } else if (*begin == '{') { + ++begin; + auto handler = dynamic_spec_id_handler{ctx, ref}; + if (begin != end) begin = parse_arg_id(begin, end, handler); + if (begin != end && *begin == '}') return ++begin; + throw_format_error("invalid format string"); + } + return begin; +} + +template +FMT_CONSTEXPR auto parse_precision(const Char* begin, const Char* end, + int& value, arg_ref& ref, + basic_format_parse_context& ctx) + -> const Char* { + ++begin; + if (begin == end || *begin == '}') { + throw_format_error("invalid precision"); + return begin; + } + return parse_dynamic_spec(begin, end, value, ref, ctx); +} + +enum class state { start, align, sign, hash, zero, width, precision, locale }; + +// Parses standard format specifiers. +template +FMT_CONSTEXPR FMT_INLINE auto parse_format_specs( + const Char* begin, const Char* end, dynamic_format_specs& specs, + basic_format_parse_context& ctx, type arg_type) -> const Char* { + auto c = '\0'; + if (end - begin > 1) { + auto next = to_ascii(begin[1]); + c = parse_align(next) == align::none ? to_ascii(*begin) : '\0'; + } else { + if (begin == end) return begin; + c = to_ascii(*begin); + } + + struct { + state current_state = state::start; + FMT_CONSTEXPR void operator()(state s, bool valid = true) { + if (current_state >= s || !valid) + throw_format_error("invalid format specifier"); + current_state = s; + } + } enter_state; + + using pres = presentation_type; + constexpr auto integral_set = sint_set | uint_set | bool_set | char_set; + struct { + const Char*& begin; + dynamic_format_specs& specs; + type arg_type; + + FMT_CONSTEXPR auto operator()(pres pres_type, int set) -> const Char* { + if (!in(arg_type, set)) { + if (arg_type == type::none_type) return begin; + throw_format_error("invalid format specifier"); + } + specs.type = pres_type; + return begin + 1; + } + } parse_presentation_type{begin, specs, arg_type}; + + for (;;) { + switch (c) { + case '<': + case '>': + case '^': + enter_state(state::align); + specs.align = parse_align(c); + ++begin; + break; + case '+': + case '-': + case ' ': + if (arg_type == type::none_type) return begin; + enter_state(state::sign, in(arg_type, sint_set | float_set)); + switch (c) { + case '+': + specs.sign = sign::plus; + break; + case '-': + specs.sign = sign::minus; + break; + case ' ': + specs.sign = sign::space; + break; + } + ++begin; + break; + case '#': + if (arg_type == type::none_type) return begin; + enter_state(state::hash, is_arithmetic_type(arg_type)); + specs.alt = true; + ++begin; + break; + case '0': + enter_state(state::zero); + if (!is_arithmetic_type(arg_type)) { + if (arg_type == type::none_type) return begin; + throw_format_error("format specifier requires numeric argument"); + } + if (specs.align == align::none) { + // Ignore 0 if align is specified for compatibility with std::format. + specs.align = align::numeric; + specs.fill[0] = Char('0'); + } + ++begin; + break; + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + case '{': + enter_state(state::width); + begin = parse_dynamic_spec(begin, end, specs.width, specs.width_ref, ctx); + break; + case '.': + if (arg_type == type::none_type) return begin; + enter_state(state::precision, + in(arg_type, float_set | string_set | cstring_set)); + begin = parse_precision(begin, end, specs.precision, specs.precision_ref, + ctx); + break; + case 'L': + if (arg_type == type::none_type) return begin; + enter_state(state::locale, is_arithmetic_type(arg_type)); + specs.localized = true; + ++begin; + break; + case 'd': + return parse_presentation_type(pres::dec, integral_set); + case 'o': + return parse_presentation_type(pres::oct, integral_set); + case 'x': + return parse_presentation_type(pres::hex_lower, integral_set); + case 'X': + return parse_presentation_type(pres::hex_upper, integral_set); + case 'b': + return parse_presentation_type(pres::bin_lower, integral_set); + case 'B': + return parse_presentation_type(pres::bin_upper, integral_set); + case 'a': + return parse_presentation_type(pres::hexfloat_lower, float_set); + case 'A': + return parse_presentation_type(pres::hexfloat_upper, float_set); + case 'e': + return parse_presentation_type(pres::exp_lower, float_set); + case 'E': + return parse_presentation_type(pres::exp_upper, float_set); + case 'f': + return parse_presentation_type(pres::fixed_lower, float_set); + case 'F': + return parse_presentation_type(pres::fixed_upper, float_set); + case 'g': + return parse_presentation_type(pres::general_lower, float_set); + case 'G': + return parse_presentation_type(pres::general_upper, float_set); + case 'c': + if (arg_type == type::bool_type) + throw_format_error("invalid format specifier"); + return parse_presentation_type(pres::chr, integral_set); + case 's': + return parse_presentation_type(pres::string, + bool_set | string_set | cstring_set); + case 'p': + return parse_presentation_type(pres::pointer, pointer_set | cstring_set); + case '?': + return parse_presentation_type(pres::debug, + char_set | string_set | cstring_set); + case '}': + return begin; + default: { + if (*begin == '}') return begin; + // Parse fill and alignment. + auto fill_end = begin + code_point_length(begin); + if (end - fill_end <= 0) { + throw_format_error("invalid format specifier"); + return begin; + } + if (*begin == '{') { + throw_format_error("invalid fill character '{'"); + return begin; + } + auto align = parse_align(to_ascii(*fill_end)); + enter_state(state::align, align != align::none); + specs.fill = {begin, to_unsigned(fill_end - begin)}; + specs.align = align; + begin = fill_end + 1; + } + } + if (begin == end) return begin; + c = to_ascii(*begin); + } +} + +template +FMT_CONSTEXPR auto parse_replacement_field(const Char* begin, const Char* end, + Handler&& handler) -> const Char* { + struct id_adapter { + Handler& handler; + int arg_id; + + FMT_CONSTEXPR void on_auto() { arg_id = handler.on_arg_id(); } + FMT_CONSTEXPR void on_index(int id) { arg_id = handler.on_arg_id(id); } + FMT_CONSTEXPR void on_name(basic_string_view id) { + arg_id = handler.on_arg_id(id); + } + }; + + ++begin; + if (begin == end) return handler.on_error("invalid format string"), end; + if (*begin == '}') { + handler.on_replacement_field(handler.on_arg_id(), begin); + } else if (*begin == '{') { + handler.on_text(begin, begin + 1); + } else { + auto adapter = id_adapter{handler, 0}; + begin = parse_arg_id(begin, end, adapter); + Char c = begin != end ? *begin : Char(); + if (c == '}') { + handler.on_replacement_field(adapter.arg_id, begin); + } else if (c == ':') { + begin = handler.on_format_specs(adapter.arg_id, begin + 1, end); + if (begin == end || *begin != '}') + return handler.on_error("unknown format specifier"), end; + } else { + return handler.on_error("missing '}' in format string"), end; + } + } + return begin + 1; +} + +template +FMT_CONSTEXPR FMT_INLINE void parse_format_string( + basic_string_view format_str, Handler&& handler) { + auto begin = format_str.data(); + auto end = begin + format_str.size(); + if (end - begin < 32) { + // Use a simple loop instead of memchr for small strings. + const Char* p = begin; + while (p != end) { + auto c = *p++; + if (c == '{') { + handler.on_text(begin, p - 1); + begin = p = parse_replacement_field(p - 1, end, handler); + } else if (c == '}') { + if (p == end || *p != '}') + return handler.on_error("unmatched '}' in format string"); + handler.on_text(begin, p); + begin = ++p; + } + } + handler.on_text(begin, end); + return; + } + struct writer { + FMT_CONSTEXPR void operator()(const Char* from, const Char* to) { + if (from == to) return; + for (;;) { + const Char* p = nullptr; + if (!find(from, to, Char('}'), p)) + return handler_.on_text(from, to); + ++p; + if (p == to || *p != '}') + return handler_.on_error("unmatched '}' in format string"); + handler_.on_text(from, p); + from = p + 1; + } + } + Handler& handler_; + } write = {handler}; + while (begin != end) { + // Doing two passes with memchr (one for '{' and another for '}') is up to + // 2.5x faster than the naive one-pass implementation on big format strings. + const Char* p = begin; + if (*begin != '{' && !find(begin + 1, end, Char('{'), p)) + return write(begin, end); + write(begin, p); + begin = parse_replacement_field(p, end, handler); + } +} + +template ::value> struct strip_named_arg { + using type = T; +}; +template struct strip_named_arg { + using type = remove_cvref_t; +}; + +template +FMT_CONSTEXPR auto parse_format_specs(ParseContext& ctx) + -> decltype(ctx.begin()) { + using char_type = typename ParseContext::char_type; + using context = buffer_context; + using mapped_type = conditional_t< + mapped_type_constant::value != type::custom_type, + decltype(arg_mapper().map(std::declval())), + typename strip_named_arg::type>; +#if defined(__cpp_if_constexpr) + if constexpr (std::is_default_constructible< + formatter>::value) { + return formatter().parse(ctx); + } else { + type_is_unformattable_for _; + return ctx.begin(); + } +#else + return formatter().parse(ctx); +#endif +} + +// Checks char specs and returns true iff the presentation type is char-like. +template +FMT_CONSTEXPR auto check_char_specs(const format_specs& specs) -> bool { + if (specs.type != presentation_type::none && + specs.type != presentation_type::chr && + specs.type != presentation_type::debug) { + return false; + } + if (specs.align == align::numeric || specs.sign != sign::none || specs.alt) + throw_format_error("invalid format specifier for char"); + return true; +} + +#if FMT_USE_NONTYPE_TEMPLATE_ARGS +template +constexpr auto get_arg_index_by_name(basic_string_view name) -> int { + if constexpr (is_statically_named_arg()) { + if (name == T::name) return N; + } + if constexpr (sizeof...(Args) > 0) + return get_arg_index_by_name(name); + (void)name; // Workaround an MSVC bug about "unused" parameter. + return -1; +} +#endif + +template +FMT_CONSTEXPR auto get_arg_index_by_name(basic_string_view name) -> int { +#if FMT_USE_NONTYPE_TEMPLATE_ARGS + if constexpr (sizeof...(Args) > 0) + return get_arg_index_by_name<0, Args...>(name); +#endif + (void)name; + return -1; +} + +template class format_string_checker { + private: + using parse_context_type = compile_parse_context; + static constexpr int num_args = sizeof...(Args); + + // Format specifier parsing function. + // In the future basic_format_parse_context will replace compile_parse_context + // here and will use is_constant_evaluated and downcasting to access the data + // needed for compile-time checks: https://godbolt.org/z/GvWzcTjh1. + using parse_func = const Char* (*)(parse_context_type&); + + type types_[num_args > 0 ? static_cast(num_args) : 1]; + parse_context_type context_; + parse_func parse_funcs_[num_args > 0 ? static_cast(num_args) : 1]; + + public: + explicit FMT_CONSTEXPR format_string_checker(basic_string_view fmt) + : types_{mapped_type_constant>::value...}, + context_(fmt, num_args, types_), + parse_funcs_{&parse_format_specs...} {} + + FMT_CONSTEXPR void on_text(const Char*, const Char*) {} + + FMT_CONSTEXPR auto on_arg_id() -> int { return context_.next_arg_id(); } + FMT_CONSTEXPR auto on_arg_id(int id) -> int { + return context_.check_arg_id(id), id; + } + FMT_CONSTEXPR auto on_arg_id(basic_string_view id) -> int { +#if FMT_USE_NONTYPE_TEMPLATE_ARGS + auto index = get_arg_index_by_name(id); + if (index < 0) on_error("named argument is not found"); + return index; +#else + (void)id; + on_error("compile-time checks for named arguments require C++20 support"); + return 0; +#endif + } + + FMT_CONSTEXPR void on_replacement_field(int id, const Char* begin) { + on_format_specs(id, begin, begin); // Call parse() on empty specs. + } + + FMT_CONSTEXPR auto on_format_specs(int id, const Char* begin, const Char*) + -> const Char* { + context_.advance_to(begin); + // id >= 0 check is a workaround for gcc 10 bug (#2065). + return id >= 0 && id < num_args ? parse_funcs_[id](context_) : begin; + } + + FMT_CONSTEXPR void on_error(const char* message) { + throw_format_error(message); + } +}; + +// Reports a compile-time error if S is not a valid format string. +template ::value)> +FMT_INLINE void check_format_string(const S&) { +#ifdef FMT_ENFORCE_COMPILE_STRING + static_assert(is_compile_string::value, + "FMT_ENFORCE_COMPILE_STRING requires all format strings to use " + "FMT_STRING."); +#endif +} +template ::value)> +void check_format_string(S format_str) { + using char_t = typename S::char_type; + FMT_CONSTEXPR auto s = basic_string_view(format_str); + using checker = format_string_checker...>; + FMT_CONSTEXPR bool error = (parse_format_string(s, checker(s)), true); + ignore_unused(error); +} + +template struct vformat_args { + using type = basic_format_args< + basic_format_context>, Char>>; +}; +template <> struct vformat_args { + using type = format_args; +}; + +// Use vformat_args and avoid type_identity to keep symbols short. +template +void vformat_to(buffer& buf, basic_string_view fmt, + typename vformat_args::type args, locale_ref loc = {}); + +FMT_API void vprint_mojibake(std::FILE*, string_view, format_args); +#ifndef _WIN32 +inline void vprint_mojibake(std::FILE*, string_view, format_args) {} +#endif +} // namespace detail + +FMT_BEGIN_EXPORT + +// A formatter specialization for natively supported types. +template +struct formatter::value != + detail::type::custom_type>> { + private: + detail::dynamic_format_specs specs_; + + public: + template + FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const Char* { + auto type = detail::type_constant::value; + auto end = + detail::parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx, type); + if (type == detail::type::char_type) detail::check_char_specs(specs_); + return end; + } + + template ::value, + FMT_ENABLE_IF(U == detail::type::string_type || + U == detail::type::cstring_type || + U == detail::type::char_type)> + FMT_CONSTEXPR void set_debug_format(bool set = true) { + specs_.type = set ? presentation_type::debug : presentation_type::none; + } + + template + FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const + -> decltype(ctx.out()); +}; + +template struct runtime_format_string { + basic_string_view str; +}; + +/** A compile-time format string. */ +template class basic_format_string { + private: + basic_string_view str_; + + public: + template >::value)> + FMT_CONSTEVAL FMT_INLINE basic_format_string(const S& s) : str_(s) { + static_assert( + detail::count< + (std::is_base_of>::value && + std::is_reference::value)...>() == 0, + "passing views as lvalues is disallowed"); +#ifdef FMT_HAS_CONSTEVAL + if constexpr (detail::count_named_args() == + detail::count_statically_named_args()) { + using checker = + detail::format_string_checker...>; + detail::parse_format_string(str_, checker(s)); + } +#else + detail::check_format_string(s); +#endif + } + basic_format_string(runtime_format_string fmt) : str_(fmt.str) {} + + FMT_INLINE operator basic_string_view() const { return str_; } + FMT_INLINE auto get() const -> basic_string_view { return str_; } +}; + +#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409 +// Workaround broken conversion on older gcc. +template using format_string = string_view; +inline auto runtime(string_view s) -> string_view { return s; } +#else +template +using format_string = basic_format_string...>; +/** + \rst + Creates a runtime format string. + + **Example**:: + + // Check format string at runtime instead of compile-time. + fmt::print(fmt::runtime("{:d}"), "I am not a number"); + \endrst + */ +inline auto runtime(string_view s) -> runtime_format_string<> { return {{s}}; } +#endif + +FMT_API auto vformat(string_view fmt, format_args args) -> std::string; + +/** + \rst + Formats ``args`` according to specifications in ``fmt`` and returns the result + as a string. + + **Example**:: + + #include + std::string message = fmt::format("The answer is {}.", 42); + \endrst +*/ +template +FMT_NODISCARD FMT_INLINE auto format(format_string fmt, T&&... args) + -> std::string { + return vformat(fmt, fmt::make_format_args(args...)); +} + +/** Formats a string and writes the output to ``out``. */ +template ::value)> +auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt { + auto&& buf = detail::get_buffer(out); + detail::vformat_to(buf, fmt, args, {}); + return detail::get_iterator(buf, out); +} + +/** + \rst + Formats ``args`` according to specifications in ``fmt``, writes the result to + the output iterator ``out`` and returns the iterator past the end of the output + range. `format_to` does not append a terminating null character. + + **Example**:: + + auto out = std::vector(); + fmt::format_to(std::back_inserter(out), "{}", 42); + \endrst + */ +template ::value)> +FMT_INLINE auto format_to(OutputIt out, format_string fmt, T&&... args) + -> OutputIt { + return vformat_to(out, fmt, fmt::make_format_args(args...)); +} + +template struct format_to_n_result { + /** Iterator past the end of the output range. */ + OutputIt out; + /** Total (not truncated) output size. */ + size_t size; +}; + +template ::value)> +auto vformat_to_n(OutputIt out, size_t n, string_view fmt, format_args args) + -> format_to_n_result { + using traits = detail::fixed_buffer_traits; + auto buf = detail::iterator_buffer(out, n); + detail::vformat_to(buf, fmt, args, {}); + return {buf.out(), buf.count()}; +} + +/** + \rst + Formats ``args`` according to specifications in ``fmt``, writes up to ``n`` + characters of the result to the output iterator ``out`` and returns the total + (not truncated) output size and the iterator past the end of the output range. + `format_to_n` does not append a terminating null character. + \endrst + */ +template ::value)> +FMT_INLINE auto format_to_n(OutputIt out, size_t n, format_string fmt, + T&&... args) -> format_to_n_result { + return vformat_to_n(out, n, fmt, fmt::make_format_args(args...)); +} + +/** Returns the number of chars in the output of ``format(fmt, args...)``. */ +template +FMT_NODISCARD FMT_INLINE auto formatted_size(format_string fmt, + T&&... args) -> size_t { + auto buf = detail::counting_buffer<>(); + detail::vformat_to(buf, fmt, fmt::make_format_args(args...), {}); + return buf.count(); +} + +FMT_API void vprint(string_view fmt, format_args args); +FMT_API void vprint(std::FILE* f, string_view fmt, format_args args); + +/** + \rst + Formats ``args`` according to specifications in ``fmt`` and writes the output + to ``stdout``. + + **Example**:: + + fmt::print("Elapsed time: {0:.2f} seconds", 1.23); + \endrst + */ +template +FMT_INLINE void print(format_string fmt, T&&... args) { + const auto& vargs = fmt::make_format_args(args...); + return detail::is_utf8() ? vprint(fmt, vargs) + : detail::vprint_mojibake(stdout, fmt, vargs); +} + +/** + \rst + Formats ``args`` according to specifications in ``fmt`` and writes the + output to the file ``f``. + + **Example**:: + + fmt::print(stderr, "Don't {}!", "panic"); + \endrst + */ +template +FMT_INLINE void print(std::FILE* f, format_string fmt, T&&... args) { + const auto& vargs = fmt::make_format_args(args...); + return detail::is_utf8() ? vprint(f, fmt, vargs) + : detail::vprint_mojibake(f, fmt, vargs); +} + +/** + Formats ``args`` according to specifications in ``fmt`` and writes the + output to the file ``f`` followed by a newline. + */ +template +FMT_INLINE void println(std::FILE* f, format_string fmt, T&&... args) { + return fmt::print(f, "{}\n", fmt::format(fmt, std::forward(args)...)); +} + +/** + Formats ``args`` according to specifications in ``fmt`` and writes the output + to ``stdout`` followed by a newline. + */ +template +FMT_INLINE void println(format_string fmt, T&&... args) { + return fmt::println(stdout, fmt, std::forward(args)...); +} + +FMT_END_EXPORT +FMT_GCC_PRAGMA("GCC pop_options") +FMT_END_NAMESPACE + +#ifdef FMT_HEADER_ONLY +# include "format.h" +#endif +#endif // FMT_CORE_H_ diff --git a/vm/fmt/format-inl.h b/vm/fmt/format-inl.h new file mode 100644 index 0000000000..efac5d1f88 --- /dev/null +++ b/vm/fmt/format-inl.h @@ -0,0 +1,1678 @@ +// Formatting library for C++ - implementation +// +// Copyright (c) 2012 - 2016, Victor Zverovich +// All rights reserved. +// +// For the license information refer to format.h. + +#ifndef FMT_FORMAT_INL_H_ +#define FMT_FORMAT_INL_H_ + +#include +#include // errno +#include +#include +#include + +#ifndef FMT_STATIC_THOUSANDS_SEPARATOR +# include +#endif + +#if defined(_WIN32) && !defined(FMT_WINDOWS_NO_WCHAR) +# include // _isatty +#endif + +#include "format.h" + +FMT_BEGIN_NAMESPACE +namespace detail { + +FMT_FUNC void assert_fail(const char* file, int line, const char* message) { + // Use unchecked std::fprintf to avoid triggering another assertion when + // writing to stderr fails + std::fprintf(stderr, "%s:%d: assertion failed: %s", file, line, message); + // Chosen instead of std::abort to satisfy Clang in CUDA mode during device + // code pass. + std::terminate(); +} + +FMT_FUNC void throw_format_error(const char* message) { + FMT_THROW(format_error(message)); +} + +FMT_FUNC void format_error_code(detail::buffer& out, int error_code, + string_view message) noexcept { + // Report error code making sure that the output fits into + // inline_buffer_size to avoid dynamic memory allocation and potential + // bad_alloc. + out.try_resize(0); + static const char SEP[] = ": "; + static const char ERROR_STR[] = "error "; + // Subtract 2 to account for terminating null characters in SEP and ERROR_STR. + size_t error_code_size = sizeof(SEP) + sizeof(ERROR_STR) - 2; + auto abs_value = static_cast>(error_code); + if (detail::is_negative(error_code)) { + abs_value = 0 - abs_value; + ++error_code_size; + } + error_code_size += detail::to_unsigned(detail::count_digits(abs_value)); + auto it = buffer_appender(out); + if (message.size() <= inline_buffer_size - error_code_size) + fmt::format_to(it, FMT_STRING("{}{}"), message, SEP); + fmt::format_to(it, FMT_STRING("{}{}"), ERROR_STR, error_code); + FMT_ASSERT(out.size() <= inline_buffer_size, ""); +} + +FMT_FUNC void report_error(format_func func, int error_code, + const char* message) noexcept { + memory_buffer full_message; + func(full_message, error_code, message); + // Don't use fwrite_fully because the latter may throw. + if (std::fwrite(full_message.data(), full_message.size(), 1, stderr) > 0) + std::fputc('\n', stderr); +} + +// A wrapper around fwrite that throws on error. +inline void fwrite_fully(const void* ptr, size_t count, FILE* stream) { + size_t written = std::fwrite(ptr, 1, count, stream); + if (written < count) + FMT_THROW(system_error(errno, FMT_STRING("cannot write to file"))); +} + +#ifndef FMT_STATIC_THOUSANDS_SEPARATOR +template +locale_ref::locale_ref(const Locale& loc) : locale_(&loc) { + static_assert(std::is_same::value, ""); +} + +template auto locale_ref::get() const -> Locale { + static_assert(std::is_same::value, ""); + return locale_ ? *static_cast(locale_) : std::locale(); +} + +template +FMT_FUNC auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result { + auto& facet = std::use_facet>(loc.get()); + auto grouping = facet.grouping(); + auto thousands_sep = grouping.empty() ? Char() : facet.thousands_sep(); + return {std::move(grouping), thousands_sep}; +} +template +FMT_FUNC auto decimal_point_impl(locale_ref loc) -> Char { + return std::use_facet>(loc.get()) + .decimal_point(); +} +#else +template +FMT_FUNC auto thousands_sep_impl(locale_ref) -> thousands_sep_result { + return {"\03", FMT_STATIC_THOUSANDS_SEPARATOR}; +} +template FMT_FUNC Char decimal_point_impl(locale_ref) { + return '.'; +} +#endif + +FMT_FUNC auto write_loc(appender out, loc_value value, + const format_specs<>& specs, locale_ref loc) -> bool { +#ifndef FMT_STATIC_THOUSANDS_SEPARATOR + auto locale = loc.get(); + // We cannot use the num_put facet because it may produce output in + // a wrong encoding. + using facet = format_facet; + if (std::has_facet(locale)) + return std::use_facet(locale).put(out, value, specs); + return facet(locale).put(out, value, specs); +#endif + return false; +} +} // namespace detail + +template typename Locale::id format_facet::id; + +#ifndef FMT_STATIC_THOUSANDS_SEPARATOR +template format_facet::format_facet(Locale& loc) { + auto& numpunct = std::use_facet>(loc); + grouping_ = numpunct.grouping(); + if (!grouping_.empty()) separator_ = std::string(1, numpunct.thousands_sep()); +} + +template <> +FMT_API FMT_FUNC auto format_facet::do_put( + appender out, loc_value val, const format_specs<>& specs) const -> bool { + return val.visit( + detail::loc_writer<>{out, specs, separator_, grouping_, decimal_point_}); +} +#endif + +FMT_FUNC auto vsystem_error(int error_code, string_view fmt, format_args args) + -> std::system_error { + auto ec = std::error_code(error_code, std::generic_category()); + return std::system_error(ec, vformat(fmt, args)); +} + +namespace detail { + +template +inline auto operator==(basic_fp x, basic_fp y) -> bool { + return x.f == y.f && x.e == y.e; +} + +// Compilers should be able to optimize this into the ror instruction. +FMT_CONSTEXPR inline auto rotr(uint32_t n, uint32_t r) noexcept -> uint32_t { + r &= 31; + return (n >> r) | (n << (32 - r)); +} +FMT_CONSTEXPR inline auto rotr(uint64_t n, uint32_t r) noexcept -> uint64_t { + r &= 63; + return (n >> r) | (n << (64 - r)); +} + +// Implementation of Dragonbox algorithm: https://github.com/jk-jeon/dragonbox. +namespace dragonbox { +// Computes upper 64 bits of multiplication of a 32-bit unsigned integer and a +// 64-bit unsigned integer. +inline auto umul96_upper64(uint32_t x, uint64_t y) noexcept -> uint64_t { + return umul128_upper64(static_cast(x) << 32, y); +} + +// Computes lower 128 bits of multiplication of a 64-bit unsigned integer and a +// 128-bit unsigned integer. +inline auto umul192_lower128(uint64_t x, uint128_fallback y) noexcept + -> uint128_fallback { + uint64_t high = x * y.high(); + uint128_fallback high_low = umul128(x, y.low()); + return {high + high_low.high(), high_low.low()}; +} + +// Computes lower 64 bits of multiplication of a 32-bit unsigned integer and a +// 64-bit unsigned integer. +inline auto umul96_lower64(uint32_t x, uint64_t y) noexcept -> uint64_t { + return x * y; +} + +// Various fast log computations. +inline auto floor_log10_pow2_minus_log10_4_over_3(int e) noexcept -> int { + FMT_ASSERT(e <= 2936 && e >= -2985, "too large exponent"); + return (e * 631305 - 261663) >> 21; +} + +FMT_INLINE_VARIABLE constexpr struct { + uint32_t divisor; + int shift_amount; +} div_small_pow10_infos[] = {{10, 16}, {100, 16}}; + +// Replaces n by floor(n / pow(10, N)) returning true if and only if n is +// divisible by pow(10, N). +// Precondition: n <= pow(10, N + 1). +template +auto check_divisibility_and_divide_by_pow10(uint32_t& n) noexcept -> bool { + // The numbers below are chosen such that: + // 1. floor(n/d) = floor(nm / 2^k) where d=10 or d=100, + // 2. nm mod 2^k < m if and only if n is divisible by d, + // where m is magic_number, k is shift_amount + // and d is divisor. + // + // Item 1 is a common technique of replacing division by a constant with + // multiplication, see e.g. "Division by Invariant Integers Using + // Multiplication" by Granlund and Montgomery (1994). magic_number (m) is set + // to ceil(2^k/d) for large enough k. + // The idea for item 2 originates from Schubfach. + constexpr auto info = div_small_pow10_infos[N - 1]; + FMT_ASSERT(n <= info.divisor * 10, "n is too large"); + constexpr uint32_t magic_number = + (1u << info.shift_amount) / info.divisor + 1; + n *= magic_number; + const uint32_t comparison_mask = (1u << info.shift_amount) - 1; + bool result = (n & comparison_mask) < magic_number; + n >>= info.shift_amount; + return result; +} + +// Computes floor(n / pow(10, N)) for small n and N. +// Precondition: n <= pow(10, N + 1). +template auto small_division_by_pow10(uint32_t n) noexcept -> uint32_t { + constexpr auto info = div_small_pow10_infos[N - 1]; + FMT_ASSERT(n <= info.divisor * 10, "n is too large"); + constexpr uint32_t magic_number = + (1u << info.shift_amount) / info.divisor + 1; + return (n * magic_number) >> info.shift_amount; +} + +// Computes floor(n / 10^(kappa + 1)) (float) +inline auto divide_by_10_to_kappa_plus_1(uint32_t n) noexcept -> uint32_t { + // 1374389535 = ceil(2^37/100) + return static_cast((static_cast(n) * 1374389535) >> 37); +} +// Computes floor(n / 10^(kappa + 1)) (double) +inline auto divide_by_10_to_kappa_plus_1(uint64_t n) noexcept -> uint64_t { + // 2361183241434822607 = ceil(2^(64+7)/1000) + return umul128_upper64(n, 2361183241434822607ull) >> 7; +} + +// Various subroutines using pow10 cache +template struct cache_accessor; + +template <> struct cache_accessor { + using carrier_uint = float_info::carrier_uint; + using cache_entry_type = uint64_t; + + static auto get_cached_power(int k) noexcept -> uint64_t { + FMT_ASSERT(k >= float_info::min_k && k <= float_info::max_k, + "k is out of range"); + static constexpr const uint64_t pow10_significands[] = { + 0x81ceb32c4b43fcf5, 0xa2425ff75e14fc32, 0xcad2f7f5359a3b3f, + 0xfd87b5f28300ca0e, 0x9e74d1b791e07e49, 0xc612062576589ddb, + 0xf79687aed3eec552, 0x9abe14cd44753b53, 0xc16d9a0095928a28, + 0xf1c90080baf72cb2, 0x971da05074da7bef, 0xbce5086492111aeb, + 0xec1e4a7db69561a6, 0x9392ee8e921d5d08, 0xb877aa3236a4b44a, + 0xe69594bec44de15c, 0x901d7cf73ab0acda, 0xb424dc35095cd810, + 0xe12e13424bb40e14, 0x8cbccc096f5088cc, 0xafebff0bcb24aaff, + 0xdbe6fecebdedd5bf, 0x89705f4136b4a598, 0xabcc77118461cefd, + 0xd6bf94d5e57a42bd, 0x8637bd05af6c69b6, 0xa7c5ac471b478424, + 0xd1b71758e219652c, 0x83126e978d4fdf3c, 0xa3d70a3d70a3d70b, + 0xcccccccccccccccd, 0x8000000000000000, 0xa000000000000000, + 0xc800000000000000, 0xfa00000000000000, 0x9c40000000000000, + 0xc350000000000000, 0xf424000000000000, 0x9896800000000000, + 0xbebc200000000000, 0xee6b280000000000, 0x9502f90000000000, + 0xba43b74000000000, 0xe8d4a51000000000, 0x9184e72a00000000, + 0xb5e620f480000000, 0xe35fa931a0000000, 0x8e1bc9bf04000000, + 0xb1a2bc2ec5000000, 0xde0b6b3a76400000, 0x8ac7230489e80000, + 0xad78ebc5ac620000, 0xd8d726b7177a8000, 0x878678326eac9000, + 0xa968163f0a57b400, 0xd3c21bcecceda100, 0x84595161401484a0, + 0xa56fa5b99019a5c8, 0xcecb8f27f4200f3a, 0x813f3978f8940985, + 0xa18f07d736b90be6, 0xc9f2c9cd04674edf, 0xfc6f7c4045812297, + 0x9dc5ada82b70b59e, 0xc5371912364ce306, 0xf684df56c3e01bc7, + 0x9a130b963a6c115d, 0xc097ce7bc90715b4, 0xf0bdc21abb48db21, + 0x96769950b50d88f5, 0xbc143fa4e250eb32, 0xeb194f8e1ae525fe, + 0x92efd1b8d0cf37bf, 0xb7abc627050305ae, 0xe596b7b0c643c71a, + 0x8f7e32ce7bea5c70, 0xb35dbf821ae4f38c, 0xe0352f62a19e306f}; + return pow10_significands[k - float_info::min_k]; + } + + struct compute_mul_result { + carrier_uint result; + bool is_integer; + }; + struct compute_mul_parity_result { + bool parity; + bool is_integer; + }; + + static auto compute_mul(carrier_uint u, + const cache_entry_type& cache) noexcept + -> compute_mul_result { + auto r = umul96_upper64(u, cache); + return {static_cast(r >> 32), + static_cast(r) == 0}; + } + + static auto compute_delta(const cache_entry_type& cache, int beta) noexcept + -> uint32_t { + return static_cast(cache >> (64 - 1 - beta)); + } + + static auto compute_mul_parity(carrier_uint two_f, + const cache_entry_type& cache, + int beta) noexcept + -> compute_mul_parity_result { + FMT_ASSERT(beta >= 1, ""); + FMT_ASSERT(beta < 64, ""); + + auto r = umul96_lower64(two_f, cache); + return {((r >> (64 - beta)) & 1) != 0, + static_cast(r >> (32 - beta)) == 0}; + } + + static auto compute_left_endpoint_for_shorter_interval_case( + const cache_entry_type& cache, int beta) noexcept -> carrier_uint { + return static_cast( + (cache - (cache >> (num_significand_bits() + 2))) >> + (64 - num_significand_bits() - 1 - beta)); + } + + static auto compute_right_endpoint_for_shorter_interval_case( + const cache_entry_type& cache, int beta) noexcept -> carrier_uint { + return static_cast( + (cache + (cache >> (num_significand_bits() + 1))) >> + (64 - num_significand_bits() - 1 - beta)); + } + + static auto compute_round_up_for_shorter_interval_case( + const cache_entry_type& cache, int beta) noexcept -> carrier_uint { + return (static_cast( + cache >> (64 - num_significand_bits() - 2 - beta)) + + 1) / + 2; + } +}; + +template <> struct cache_accessor { + using carrier_uint = float_info::carrier_uint; + using cache_entry_type = uint128_fallback; + + static auto get_cached_power(int k) noexcept -> uint128_fallback { + FMT_ASSERT(k >= float_info::min_k && k <= float_info::max_k, + "k is out of range"); + + static constexpr const uint128_fallback pow10_significands[] = { +#if FMT_USE_FULL_CACHE_DRAGONBOX + {0xff77b1fcbebcdc4f, 0x25e8e89c13bb0f7b}, + {0x9faacf3df73609b1, 0x77b191618c54e9ad}, + {0xc795830d75038c1d, 0xd59df5b9ef6a2418}, + {0xf97ae3d0d2446f25, 0x4b0573286b44ad1e}, + {0x9becce62836ac577, 0x4ee367f9430aec33}, + {0xc2e801fb244576d5, 0x229c41f793cda740}, + {0xf3a20279ed56d48a, 0x6b43527578c11110}, + {0x9845418c345644d6, 0x830a13896b78aaaa}, + {0xbe5691ef416bd60c, 0x23cc986bc656d554}, + {0xedec366b11c6cb8f, 0x2cbfbe86b7ec8aa9}, + {0x94b3a202eb1c3f39, 0x7bf7d71432f3d6aa}, + {0xb9e08a83a5e34f07, 0xdaf5ccd93fb0cc54}, + {0xe858ad248f5c22c9, 0xd1b3400f8f9cff69}, + {0x91376c36d99995be, 0x23100809b9c21fa2}, + {0xb58547448ffffb2d, 0xabd40a0c2832a78b}, + {0xe2e69915b3fff9f9, 0x16c90c8f323f516d}, + {0x8dd01fad907ffc3b, 0xae3da7d97f6792e4}, + {0xb1442798f49ffb4a, 0x99cd11cfdf41779d}, + {0xdd95317f31c7fa1d, 0x40405643d711d584}, + {0x8a7d3eef7f1cfc52, 0x482835ea666b2573}, + {0xad1c8eab5ee43b66, 0xda3243650005eed0}, + {0xd863b256369d4a40, 0x90bed43e40076a83}, + {0x873e4f75e2224e68, 0x5a7744a6e804a292}, + {0xa90de3535aaae202, 0x711515d0a205cb37}, + {0xd3515c2831559a83, 0x0d5a5b44ca873e04}, + {0x8412d9991ed58091, 0xe858790afe9486c3}, + {0xa5178fff668ae0b6, 0x626e974dbe39a873}, + {0xce5d73ff402d98e3, 0xfb0a3d212dc81290}, + {0x80fa687f881c7f8e, 0x7ce66634bc9d0b9a}, + {0xa139029f6a239f72, 0x1c1fffc1ebc44e81}, + {0xc987434744ac874e, 0xa327ffb266b56221}, + {0xfbe9141915d7a922, 0x4bf1ff9f0062baa9}, + {0x9d71ac8fada6c9b5, 0x6f773fc3603db4aa}, + {0xc4ce17b399107c22, 0xcb550fb4384d21d4}, + {0xf6019da07f549b2b, 0x7e2a53a146606a49}, + {0x99c102844f94e0fb, 0x2eda7444cbfc426e}, + {0xc0314325637a1939, 0xfa911155fefb5309}, + {0xf03d93eebc589f88, 0x793555ab7eba27cb}, + {0x96267c7535b763b5, 0x4bc1558b2f3458df}, + {0xbbb01b9283253ca2, 0x9eb1aaedfb016f17}, + {0xea9c227723ee8bcb, 0x465e15a979c1cadd}, + {0x92a1958a7675175f, 0x0bfacd89ec191eca}, + {0xb749faed14125d36, 0xcef980ec671f667c}, + {0xe51c79a85916f484, 0x82b7e12780e7401b}, + {0x8f31cc0937ae58d2, 0xd1b2ecb8b0908811}, + {0xb2fe3f0b8599ef07, 0x861fa7e6dcb4aa16}, + {0xdfbdcece67006ac9, 0x67a791e093e1d49b}, + {0x8bd6a141006042bd, 0xe0c8bb2c5c6d24e1}, + {0xaecc49914078536d, 0x58fae9f773886e19}, + {0xda7f5bf590966848, 0xaf39a475506a899f}, + {0x888f99797a5e012d, 0x6d8406c952429604}, + {0xaab37fd7d8f58178, 0xc8e5087ba6d33b84}, + {0xd5605fcdcf32e1d6, 0xfb1e4a9a90880a65}, + {0x855c3be0a17fcd26, 0x5cf2eea09a550680}, + {0xa6b34ad8c9dfc06f, 0xf42faa48c0ea481f}, + {0xd0601d8efc57b08b, 0xf13b94daf124da27}, + {0x823c12795db6ce57, 0x76c53d08d6b70859}, + {0xa2cb1717b52481ed, 0x54768c4b0c64ca6f}, + {0xcb7ddcdda26da268, 0xa9942f5dcf7dfd0a}, + {0xfe5d54150b090b02, 0xd3f93b35435d7c4d}, + {0x9efa548d26e5a6e1, 0xc47bc5014a1a6db0}, + {0xc6b8e9b0709f109a, 0x359ab6419ca1091c}, + {0xf867241c8cc6d4c0, 0xc30163d203c94b63}, + {0x9b407691d7fc44f8, 0x79e0de63425dcf1e}, + {0xc21094364dfb5636, 0x985915fc12f542e5}, + {0xf294b943e17a2bc4, 0x3e6f5b7b17b2939e}, + {0x979cf3ca6cec5b5a, 0xa705992ceecf9c43}, + {0xbd8430bd08277231, 0x50c6ff782a838354}, + {0xece53cec4a314ebd, 0xa4f8bf5635246429}, + {0x940f4613ae5ed136, 0x871b7795e136be9a}, + {0xb913179899f68584, 0x28e2557b59846e40}, + {0xe757dd7ec07426e5, 0x331aeada2fe589d0}, + {0x9096ea6f3848984f, 0x3ff0d2c85def7622}, + {0xb4bca50b065abe63, 0x0fed077a756b53aa}, + {0xe1ebce4dc7f16dfb, 0xd3e8495912c62895}, + {0x8d3360f09cf6e4bd, 0x64712dd7abbbd95d}, + {0xb080392cc4349dec, 0xbd8d794d96aacfb4}, + {0xdca04777f541c567, 0xecf0d7a0fc5583a1}, + {0x89e42caaf9491b60, 0xf41686c49db57245}, + {0xac5d37d5b79b6239, 0x311c2875c522ced6}, + {0xd77485cb25823ac7, 0x7d633293366b828c}, + {0x86a8d39ef77164bc, 0xae5dff9c02033198}, + {0xa8530886b54dbdeb, 0xd9f57f830283fdfd}, + {0xd267caa862a12d66, 0xd072df63c324fd7c}, + {0x8380dea93da4bc60, 0x4247cb9e59f71e6e}, + {0xa46116538d0deb78, 0x52d9be85f074e609}, + {0xcd795be870516656, 0x67902e276c921f8c}, + {0x806bd9714632dff6, 0x00ba1cd8a3db53b7}, + {0xa086cfcd97bf97f3, 0x80e8a40eccd228a5}, + {0xc8a883c0fdaf7df0, 0x6122cd128006b2ce}, + {0xfad2a4b13d1b5d6c, 0x796b805720085f82}, + {0x9cc3a6eec6311a63, 0xcbe3303674053bb1}, + {0xc3f490aa77bd60fc, 0xbedbfc4411068a9d}, + {0xf4f1b4d515acb93b, 0xee92fb5515482d45}, + {0x991711052d8bf3c5, 0x751bdd152d4d1c4b}, + {0xbf5cd54678eef0b6, 0xd262d45a78a0635e}, + {0xef340a98172aace4, 0x86fb897116c87c35}, + {0x9580869f0e7aac0e, 0xd45d35e6ae3d4da1}, + {0xbae0a846d2195712, 0x8974836059cca10a}, + {0xe998d258869facd7, 0x2bd1a438703fc94c}, + {0x91ff83775423cc06, 0x7b6306a34627ddd0}, + {0xb67f6455292cbf08, 0x1a3bc84c17b1d543}, + {0xe41f3d6a7377eeca, 0x20caba5f1d9e4a94}, + {0x8e938662882af53e, 0x547eb47b7282ee9d}, + {0xb23867fb2a35b28d, 0xe99e619a4f23aa44}, + {0xdec681f9f4c31f31, 0x6405fa00e2ec94d5}, + {0x8b3c113c38f9f37e, 0xde83bc408dd3dd05}, + {0xae0b158b4738705e, 0x9624ab50b148d446}, + {0xd98ddaee19068c76, 0x3badd624dd9b0958}, + {0x87f8a8d4cfa417c9, 0xe54ca5d70a80e5d7}, + {0xa9f6d30a038d1dbc, 0x5e9fcf4ccd211f4d}, + {0xd47487cc8470652b, 0x7647c32000696720}, + {0x84c8d4dfd2c63f3b, 0x29ecd9f40041e074}, + {0xa5fb0a17c777cf09, 0xf468107100525891}, + {0xcf79cc9db955c2cc, 0x7182148d4066eeb5}, + {0x81ac1fe293d599bf, 0xc6f14cd848405531}, + {0xa21727db38cb002f, 0xb8ada00e5a506a7d}, + {0xca9cf1d206fdc03b, 0xa6d90811f0e4851d}, + {0xfd442e4688bd304a, 0x908f4a166d1da664}, + {0x9e4a9cec15763e2e, 0x9a598e4e043287ff}, + {0xc5dd44271ad3cdba, 0x40eff1e1853f29fe}, + {0xf7549530e188c128, 0xd12bee59e68ef47d}, + {0x9a94dd3e8cf578b9, 0x82bb74f8301958cf}, + {0xc13a148e3032d6e7, 0xe36a52363c1faf02}, + {0xf18899b1bc3f8ca1, 0xdc44e6c3cb279ac2}, + {0x96f5600f15a7b7e5, 0x29ab103a5ef8c0ba}, + {0xbcb2b812db11a5de, 0x7415d448f6b6f0e8}, + {0xebdf661791d60f56, 0x111b495b3464ad22}, + {0x936b9fcebb25c995, 0xcab10dd900beec35}, + {0xb84687c269ef3bfb, 0x3d5d514f40eea743}, + {0xe65829b3046b0afa, 0x0cb4a5a3112a5113}, + {0x8ff71a0fe2c2e6dc, 0x47f0e785eaba72ac}, + {0xb3f4e093db73a093, 0x59ed216765690f57}, + {0xe0f218b8d25088b8, 0x306869c13ec3532d}, + {0x8c974f7383725573, 0x1e414218c73a13fc}, + {0xafbd2350644eeacf, 0xe5d1929ef90898fb}, + {0xdbac6c247d62a583, 0xdf45f746b74abf3a}, + {0x894bc396ce5da772, 0x6b8bba8c328eb784}, + {0xab9eb47c81f5114f, 0x066ea92f3f326565}, + {0xd686619ba27255a2, 0xc80a537b0efefebe}, + {0x8613fd0145877585, 0xbd06742ce95f5f37}, + {0xa798fc4196e952e7, 0x2c48113823b73705}, + {0xd17f3b51fca3a7a0, 0xf75a15862ca504c6}, + {0x82ef85133de648c4, 0x9a984d73dbe722fc}, + {0xa3ab66580d5fdaf5, 0xc13e60d0d2e0ebbb}, + {0xcc963fee10b7d1b3, 0x318df905079926a9}, + {0xffbbcfe994e5c61f, 0xfdf17746497f7053}, + {0x9fd561f1fd0f9bd3, 0xfeb6ea8bedefa634}, + {0xc7caba6e7c5382c8, 0xfe64a52ee96b8fc1}, + {0xf9bd690a1b68637b, 0x3dfdce7aa3c673b1}, + {0x9c1661a651213e2d, 0x06bea10ca65c084f}, + {0xc31bfa0fe5698db8, 0x486e494fcff30a63}, + {0xf3e2f893dec3f126, 0x5a89dba3c3efccfb}, + {0x986ddb5c6b3a76b7, 0xf89629465a75e01d}, + {0xbe89523386091465, 0xf6bbb397f1135824}, + {0xee2ba6c0678b597f, 0x746aa07ded582e2d}, + {0x94db483840b717ef, 0xa8c2a44eb4571cdd}, + {0xba121a4650e4ddeb, 0x92f34d62616ce414}, + {0xe896a0d7e51e1566, 0x77b020baf9c81d18}, + {0x915e2486ef32cd60, 0x0ace1474dc1d122f}, + {0xb5b5ada8aaff80b8, 0x0d819992132456bb}, + {0xe3231912d5bf60e6, 0x10e1fff697ed6c6a}, + {0x8df5efabc5979c8f, 0xca8d3ffa1ef463c2}, + {0xb1736b96b6fd83b3, 0xbd308ff8a6b17cb3}, + {0xddd0467c64bce4a0, 0xac7cb3f6d05ddbdf}, + {0x8aa22c0dbef60ee4, 0x6bcdf07a423aa96c}, + {0xad4ab7112eb3929d, 0x86c16c98d2c953c7}, + {0xd89d64d57a607744, 0xe871c7bf077ba8b8}, + {0x87625f056c7c4a8b, 0x11471cd764ad4973}, + {0xa93af6c6c79b5d2d, 0xd598e40d3dd89bd0}, + {0xd389b47879823479, 0x4aff1d108d4ec2c4}, + {0x843610cb4bf160cb, 0xcedf722a585139bb}, + {0xa54394fe1eedb8fe, 0xc2974eb4ee658829}, + {0xce947a3da6a9273e, 0x733d226229feea33}, + {0x811ccc668829b887, 0x0806357d5a3f5260}, + {0xa163ff802a3426a8, 0xca07c2dcb0cf26f8}, + {0xc9bcff6034c13052, 0xfc89b393dd02f0b6}, + {0xfc2c3f3841f17c67, 0xbbac2078d443ace3}, + {0x9d9ba7832936edc0, 0xd54b944b84aa4c0e}, + {0xc5029163f384a931, 0x0a9e795e65d4df12}, + {0xf64335bcf065d37d, 0x4d4617b5ff4a16d6}, + {0x99ea0196163fa42e, 0x504bced1bf8e4e46}, + {0xc06481fb9bcf8d39, 0xe45ec2862f71e1d7}, + {0xf07da27a82c37088, 0x5d767327bb4e5a4d}, + {0x964e858c91ba2655, 0x3a6a07f8d510f870}, + {0xbbe226efb628afea, 0x890489f70a55368c}, + {0xeadab0aba3b2dbe5, 0x2b45ac74ccea842f}, + {0x92c8ae6b464fc96f, 0x3b0b8bc90012929e}, + {0xb77ada0617e3bbcb, 0x09ce6ebb40173745}, + {0xe55990879ddcaabd, 0xcc420a6a101d0516}, + {0x8f57fa54c2a9eab6, 0x9fa946824a12232e}, + {0xb32df8e9f3546564, 0x47939822dc96abfa}, + {0xdff9772470297ebd, 0x59787e2b93bc56f8}, + {0x8bfbea76c619ef36, 0x57eb4edb3c55b65b}, + {0xaefae51477a06b03, 0xede622920b6b23f2}, + {0xdab99e59958885c4, 0xe95fab368e45ecee}, + {0x88b402f7fd75539b, 0x11dbcb0218ebb415}, + {0xaae103b5fcd2a881, 0xd652bdc29f26a11a}, + {0xd59944a37c0752a2, 0x4be76d3346f04960}, + {0x857fcae62d8493a5, 0x6f70a4400c562ddc}, + {0xa6dfbd9fb8e5b88e, 0xcb4ccd500f6bb953}, + {0xd097ad07a71f26b2, 0x7e2000a41346a7a8}, + {0x825ecc24c873782f, 0x8ed400668c0c28c9}, + {0xa2f67f2dfa90563b, 0x728900802f0f32fb}, + {0xcbb41ef979346bca, 0x4f2b40a03ad2ffba}, + {0xfea126b7d78186bc, 0xe2f610c84987bfa9}, + {0x9f24b832e6b0f436, 0x0dd9ca7d2df4d7ca}, + {0xc6ede63fa05d3143, 0x91503d1c79720dbc}, + {0xf8a95fcf88747d94, 0x75a44c6397ce912b}, + {0x9b69dbe1b548ce7c, 0xc986afbe3ee11abb}, + {0xc24452da229b021b, 0xfbe85badce996169}, + {0xf2d56790ab41c2a2, 0xfae27299423fb9c4}, + {0x97c560ba6b0919a5, 0xdccd879fc967d41b}, + {0xbdb6b8e905cb600f, 0x5400e987bbc1c921}, + {0xed246723473e3813, 0x290123e9aab23b69}, + {0x9436c0760c86e30b, 0xf9a0b6720aaf6522}, + {0xb94470938fa89bce, 0xf808e40e8d5b3e6a}, + {0xe7958cb87392c2c2, 0xb60b1d1230b20e05}, + {0x90bd77f3483bb9b9, 0xb1c6f22b5e6f48c3}, + {0xb4ecd5f01a4aa828, 0x1e38aeb6360b1af4}, + {0xe2280b6c20dd5232, 0x25c6da63c38de1b1}, + {0x8d590723948a535f, 0x579c487e5a38ad0f}, + {0xb0af48ec79ace837, 0x2d835a9df0c6d852}, + {0xdcdb1b2798182244, 0xf8e431456cf88e66}, + {0x8a08f0f8bf0f156b, 0x1b8e9ecb641b5900}, + {0xac8b2d36eed2dac5, 0xe272467e3d222f40}, + {0xd7adf884aa879177, 0x5b0ed81dcc6abb10}, + {0x86ccbb52ea94baea, 0x98e947129fc2b4ea}, + {0xa87fea27a539e9a5, 0x3f2398d747b36225}, + {0xd29fe4b18e88640e, 0x8eec7f0d19a03aae}, + {0x83a3eeeef9153e89, 0x1953cf68300424ad}, + {0xa48ceaaab75a8e2b, 0x5fa8c3423c052dd8}, + {0xcdb02555653131b6, 0x3792f412cb06794e}, + {0x808e17555f3ebf11, 0xe2bbd88bbee40bd1}, + {0xa0b19d2ab70e6ed6, 0x5b6aceaeae9d0ec5}, + {0xc8de047564d20a8b, 0xf245825a5a445276}, + {0xfb158592be068d2e, 0xeed6e2f0f0d56713}, + {0x9ced737bb6c4183d, 0x55464dd69685606c}, + {0xc428d05aa4751e4c, 0xaa97e14c3c26b887}, + {0xf53304714d9265df, 0xd53dd99f4b3066a9}, + {0x993fe2c6d07b7fab, 0xe546a8038efe402a}, + {0xbf8fdb78849a5f96, 0xde98520472bdd034}, + {0xef73d256a5c0f77c, 0x963e66858f6d4441}, + {0x95a8637627989aad, 0xdde7001379a44aa9}, + {0xbb127c53b17ec159, 0x5560c018580d5d53}, + {0xe9d71b689dde71af, 0xaab8f01e6e10b4a7}, + {0x9226712162ab070d, 0xcab3961304ca70e9}, + {0xb6b00d69bb55c8d1, 0x3d607b97c5fd0d23}, + {0xe45c10c42a2b3b05, 0x8cb89a7db77c506b}, + {0x8eb98a7a9a5b04e3, 0x77f3608e92adb243}, + {0xb267ed1940f1c61c, 0x55f038b237591ed4}, + {0xdf01e85f912e37a3, 0x6b6c46dec52f6689}, + {0x8b61313bbabce2c6, 0x2323ac4b3b3da016}, + {0xae397d8aa96c1b77, 0xabec975e0a0d081b}, + {0xd9c7dced53c72255, 0x96e7bd358c904a22}, + {0x881cea14545c7575, 0x7e50d64177da2e55}, + {0xaa242499697392d2, 0xdde50bd1d5d0b9ea}, + {0xd4ad2dbfc3d07787, 0x955e4ec64b44e865}, + {0x84ec3c97da624ab4, 0xbd5af13bef0b113f}, + {0xa6274bbdd0fadd61, 0xecb1ad8aeacdd58f}, + {0xcfb11ead453994ba, 0x67de18eda5814af3}, + {0x81ceb32c4b43fcf4, 0x80eacf948770ced8}, + {0xa2425ff75e14fc31, 0xa1258379a94d028e}, + {0xcad2f7f5359a3b3e, 0x096ee45813a04331}, + {0xfd87b5f28300ca0d, 0x8bca9d6e188853fd}, + {0x9e74d1b791e07e48, 0x775ea264cf55347e}, + {0xc612062576589dda, 0x95364afe032a819e}, + {0xf79687aed3eec551, 0x3a83ddbd83f52205}, + {0x9abe14cd44753b52, 0xc4926a9672793543}, + {0xc16d9a0095928a27, 0x75b7053c0f178294}, + {0xf1c90080baf72cb1, 0x5324c68b12dd6339}, + {0x971da05074da7bee, 0xd3f6fc16ebca5e04}, + {0xbce5086492111aea, 0x88f4bb1ca6bcf585}, + {0xec1e4a7db69561a5, 0x2b31e9e3d06c32e6}, + {0x9392ee8e921d5d07, 0x3aff322e62439fd0}, + {0xb877aa3236a4b449, 0x09befeb9fad487c3}, + {0xe69594bec44de15b, 0x4c2ebe687989a9b4}, + {0x901d7cf73ab0acd9, 0x0f9d37014bf60a11}, + {0xb424dc35095cd80f, 0x538484c19ef38c95}, + {0xe12e13424bb40e13, 0x2865a5f206b06fba}, + {0x8cbccc096f5088cb, 0xf93f87b7442e45d4}, + {0xafebff0bcb24aafe, 0xf78f69a51539d749}, + {0xdbe6fecebdedd5be, 0xb573440e5a884d1c}, + {0x89705f4136b4a597, 0x31680a88f8953031}, + {0xabcc77118461cefc, 0xfdc20d2b36ba7c3e}, + {0xd6bf94d5e57a42bc, 0x3d32907604691b4d}, + {0x8637bd05af6c69b5, 0xa63f9a49c2c1b110}, + {0xa7c5ac471b478423, 0x0fcf80dc33721d54}, + {0xd1b71758e219652b, 0xd3c36113404ea4a9}, + {0x83126e978d4fdf3b, 0x645a1cac083126ea}, + {0xa3d70a3d70a3d70a, 0x3d70a3d70a3d70a4}, + {0xcccccccccccccccc, 0xcccccccccccccccd}, + {0x8000000000000000, 0x0000000000000000}, + {0xa000000000000000, 0x0000000000000000}, + {0xc800000000000000, 0x0000000000000000}, + {0xfa00000000000000, 0x0000000000000000}, + {0x9c40000000000000, 0x0000000000000000}, + {0xc350000000000000, 0x0000000000000000}, + {0xf424000000000000, 0x0000000000000000}, + {0x9896800000000000, 0x0000000000000000}, + {0xbebc200000000000, 0x0000000000000000}, + {0xee6b280000000000, 0x0000000000000000}, + {0x9502f90000000000, 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0xdee033f26797b628}, + {0xfb9b7cd9a4a7443c, 0x169840ef017da3b2}, + {0x9d412e0806e88aa5, 0x8e1f289560ee864f}, + {0xc491798a08a2ad4e, 0xf1a6f2bab92a27e3}, + {0xf5b5d7ec8acb58a2, 0xae10af696774b1dc}, + {0x9991a6f3d6bf1765, 0xacca6da1e0a8ef2a}, + {0xbff610b0cc6edd3f, 0x17fd090a58d32af4}, + {0xeff394dcff8a948e, 0xddfc4b4cef07f5b1}, + {0x95f83d0a1fb69cd9, 0x4abdaf101564f98f}, + {0xbb764c4ca7a4440f, 0x9d6d1ad41abe37f2}, + {0xea53df5fd18d5513, 0x84c86189216dc5ee}, + {0x92746b9be2f8552c, 0x32fd3cf5b4e49bb5}, + {0xb7118682dbb66a77, 0x3fbc8c33221dc2a2}, + {0xe4d5e82392a40515, 0x0fabaf3feaa5334b}, + {0x8f05b1163ba6832d, 0x29cb4d87f2a7400f}, + {0xb2c71d5bca9023f8, 0x743e20e9ef511013}, + {0xdf78e4b2bd342cf6, 0x914da9246b255417}, + {0x8bab8eefb6409c1a, 0x1ad089b6c2f7548f}, + {0xae9672aba3d0c320, 0xa184ac2473b529b2}, + {0xda3c0f568cc4f3e8, 0xc9e5d72d90a2741f}, + {0x8865899617fb1871, 0x7e2fa67c7a658893}, + {0xaa7eebfb9df9de8d, 0xddbb901b98feeab8}, + {0xd51ea6fa85785631, 0x552a74227f3ea566}, + 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0xdb0b487b6423e1e9}, + {0xb049dc016abc5e5f, 0x91ce1a9a3d2cda63}, + {0xdc5c5301c56b75f7, 0x7641a140cc7810fc}, + {0x89b9b3e11b6329ba, 0xa9e904c87fcb0a9e}, + {0xac2820d9623bf429, 0x546345fa9fbdcd45}, + {0xd732290fbacaf133, 0xa97c177947ad4096}, + {0x867f59a9d4bed6c0, 0x49ed8eabcccc485e}, + {0xa81f301449ee8c70, 0x5c68f256bfff5a75}, + {0xd226fc195c6a2f8c, 0x73832eec6fff3112}, + {0x83585d8fd9c25db7, 0xc831fd53c5ff7eac}, + {0xa42e74f3d032f525, 0xba3e7ca8b77f5e56}, + {0xcd3a1230c43fb26f, 0x28ce1bd2e55f35ec}, + {0x80444b5e7aa7cf85, 0x7980d163cf5b81b4}, + {0xa0555e361951c366, 0xd7e105bcc3326220}, + {0xc86ab5c39fa63440, 0x8dd9472bf3fefaa8}, + {0xfa856334878fc150, 0xb14f98f6f0feb952}, + {0x9c935e00d4b9d8d2, 0x6ed1bf9a569f33d4}, + {0xc3b8358109e84f07, 0x0a862f80ec4700c9}, + {0xf4a642e14c6262c8, 0xcd27bb612758c0fb}, + {0x98e7e9cccfbd7dbd, 0x8038d51cb897789d}, + {0xbf21e44003acdd2c, 0xe0470a63e6bd56c4}, + {0xeeea5d5004981478, 0x1858ccfce06cac75}, + {0x95527a5202df0ccb, 0x0f37801e0c43ebc9}, + {0xbaa718e68396cffd, 0xd30560258f54e6bb}, + {0xe950df20247c83fd, 0x47c6b82ef32a206a}, + {0x91d28b7416cdd27e, 0x4cdc331d57fa5442}, + {0xb6472e511c81471d, 0xe0133fe4adf8e953}, + {0xe3d8f9e563a198e5, 0x58180fddd97723a7}, + {0x8e679c2f5e44ff8f, 0x570f09eaa7ea7649}, + {0xb201833b35d63f73, 0x2cd2cc6551e513db}, + {0xde81e40a034bcf4f, 0xf8077f7ea65e58d2}, + {0x8b112e86420f6191, 0xfb04afaf27faf783}, + {0xadd57a27d29339f6, 0x79c5db9af1f9b564}, + {0xd94ad8b1c7380874, 0x18375281ae7822bd}, + {0x87cec76f1c830548, 0x8f2293910d0b15b6}, + {0xa9c2794ae3a3c69a, 0xb2eb3875504ddb23}, + {0xd433179d9c8cb841, 0x5fa60692a46151ec}, + {0x849feec281d7f328, 0xdbc7c41ba6bcd334}, + {0xa5c7ea73224deff3, 0x12b9b522906c0801}, + {0xcf39e50feae16bef, 0xd768226b34870a01}, + {0x81842f29f2cce375, 0xe6a1158300d46641}, + {0xa1e53af46f801c53, 0x60495ae3c1097fd1}, + {0xca5e89b18b602368, 0x385bb19cb14bdfc5}, + {0xfcf62c1dee382c42, 0x46729e03dd9ed7b6}, + {0x9e19db92b4e31ba9, 0x6c07a2c26a8346d2}, + {0xc5a05277621be293, 0xc7098b7305241886}, + {0xf70867153aa2db38, 0xb8cbee4fc66d1ea8}, + {0x9a65406d44a5c903, 0x737f74f1dc043329}, + {0xc0fe908895cf3b44, 0x505f522e53053ff3}, + {0xf13e34aabb430a15, 0x647726b9e7c68ff0}, + {0x96c6e0eab509e64d, 0x5eca783430dc19f6}, + {0xbc789925624c5fe0, 0xb67d16413d132073}, + {0xeb96bf6ebadf77d8, 0xe41c5bd18c57e890}, + {0x933e37a534cbaae7, 0x8e91b962f7b6f15a}, + {0xb80dc58e81fe95a1, 0x723627bbb5a4adb1}, + {0xe61136f2227e3b09, 0xcec3b1aaa30dd91d}, + {0x8fcac257558ee4e6, 0x213a4f0aa5e8a7b2}, + {0xb3bd72ed2af29e1f, 0xa988e2cd4f62d19e}, + {0xe0accfa875af45a7, 0x93eb1b80a33b8606}, + {0x8c6c01c9498d8b88, 0xbc72f130660533c4}, + {0xaf87023b9bf0ee6a, 0xeb8fad7c7f8680b5}, + {0xdb68c2ca82ed2a05, 0xa67398db9f6820e2}, +#else + {0xff77b1fcbebcdc4f, 0x25e8e89c13bb0f7b}, + {0xce5d73ff402d98e3, 0xfb0a3d212dc81290}, + {0xa6b34ad8c9dfc06f, 0xf42faa48c0ea481f}, + {0x86a8d39ef77164bc, 0xae5dff9c02033198}, + {0xd98ddaee19068c76, 0x3badd624dd9b0958}, + {0xafbd2350644eeacf, 0xe5d1929ef90898fb}, + {0x8df5efabc5979c8f, 0xca8d3ffa1ef463c2}, + {0xe55990879ddcaabd, 0xcc420a6a101d0516}, + {0xb94470938fa89bce, 0xf808e40e8d5b3e6a}, + {0x95a8637627989aad, 0xdde7001379a44aa9}, + {0xf1c90080baf72cb1, 0x5324c68b12dd6339}, + {0xc350000000000000, 0x0000000000000000}, + {0x9dc5ada82b70b59d, 0xf020000000000000}, + {0xfee50b7025c36a08, 0x02f236d04753d5b5}, + {0xcde6fd5e09abcf26, 0xed4c0226b55e6f87}, + {0xa6539930bf6bff45, 0x84db8346b786151d}, + {0x865b86925b9bc5c2, 0x0b8a2392ba45a9b3}, + {0xd910f7ff28069da4, 0x1b2ba1518094da05}, + {0xaf58416654a6babb, 0x387ac8d1970027b3}, + {0x8da471a9de737e24, 0x5ceaecfed289e5d3}, + {0xe4d5e82392a40515, 0x0fabaf3feaa5334b}, + {0xb8da1662e7b00a17, 0x3d6a751f3b936244}, + {0x95527a5202df0ccb, 0x0f37801e0c43ebc9}, + {0xf13e34aabb430a15, 0x647726b9e7c68ff0} +#endif + }; + +#if FMT_USE_FULL_CACHE_DRAGONBOX + return pow10_significands[k - float_info::min_k]; +#else + static constexpr const uint64_t powers_of_5_64[] = { + 0x0000000000000001, 0x0000000000000005, 0x0000000000000019, + 0x000000000000007d, 0x0000000000000271, 0x0000000000000c35, + 0x0000000000003d09, 0x000000000001312d, 0x000000000005f5e1, + 0x00000000001dcd65, 0x00000000009502f9, 0x0000000002e90edd, + 0x000000000e8d4a51, 0x0000000048c27395, 0x000000016bcc41e9, + 0x000000071afd498d, 0x0000002386f26fc1, 0x000000b1a2bc2ec5, + 0x000003782dace9d9, 0x00001158e460913d, 0x000056bc75e2d631, + 0x0001b1ae4d6e2ef5, 0x000878678326eac9, 0x002a5a058fc295ed, + 0x00d3c21bcecceda1, 0x0422ca8b0a00a425, 0x14adf4b7320334b9}; + + static const int compression_ratio = 27; + + // Compute base index. + int cache_index = (k - float_info::min_k) / compression_ratio; + int kb = cache_index * compression_ratio + float_info::min_k; + int offset = k - kb; + + // Get base cache. + uint128_fallback base_cache = pow10_significands[cache_index]; + if (offset == 0) return base_cache; + + // Compute the required amount of bit-shift. + int alpha = floor_log2_pow10(kb + offset) - floor_log2_pow10(kb) - offset; + FMT_ASSERT(alpha > 0 && alpha < 64, "shifting error detected"); + + // Try to recover the real cache. + uint64_t pow5 = powers_of_5_64[offset]; + uint128_fallback recovered_cache = umul128(base_cache.high(), pow5); + uint128_fallback middle_low = umul128(base_cache.low(), pow5); + + recovered_cache += middle_low.high(); + + uint64_t high_to_middle = recovered_cache.high() << (64 - alpha); + uint64_t middle_to_low = recovered_cache.low() << (64 - alpha); + + recovered_cache = + uint128_fallback{(recovered_cache.low() >> alpha) | high_to_middle, + ((middle_low.low() >> alpha) | middle_to_low)}; + FMT_ASSERT(recovered_cache.low() + 1 != 0, ""); + return {recovered_cache.high(), recovered_cache.low() + 1}; +#endif + } + + struct compute_mul_result { + carrier_uint result; + bool is_integer; + }; + struct compute_mul_parity_result { + bool parity; + bool is_integer; + }; + + static auto compute_mul(carrier_uint u, + const cache_entry_type& cache) noexcept + -> compute_mul_result { + auto r = umul192_upper128(u, cache); + return {r.high(), r.low() == 0}; + } + + static auto compute_delta(cache_entry_type const& cache, int beta) noexcept + -> uint32_t { + return static_cast(cache.high() >> (64 - 1 - beta)); + } + + static auto compute_mul_parity(carrier_uint two_f, + const cache_entry_type& cache, + int beta) noexcept + -> compute_mul_parity_result { + FMT_ASSERT(beta >= 1, ""); + FMT_ASSERT(beta < 64, ""); + + auto r = umul192_lower128(two_f, cache); + return {((r.high() >> (64 - beta)) & 1) != 0, + ((r.high() << beta) | (r.low() >> (64 - beta))) == 0}; + } + + static auto compute_left_endpoint_for_shorter_interval_case( + const cache_entry_type& cache, int beta) noexcept -> carrier_uint { + return (cache.high() - + (cache.high() >> (num_significand_bits() + 2))) >> + (64 - num_significand_bits() - 1 - beta); + } + + static auto compute_right_endpoint_for_shorter_interval_case( + const cache_entry_type& cache, int beta) noexcept -> carrier_uint { + return (cache.high() + + (cache.high() >> (num_significand_bits() + 1))) >> + (64 - num_significand_bits() - 1 - beta); + } + + static auto compute_round_up_for_shorter_interval_case( + const cache_entry_type& cache, int beta) noexcept -> carrier_uint { + return ((cache.high() >> (64 - num_significand_bits() - 2 - beta)) + + 1) / + 2; + } +}; + +FMT_FUNC auto get_cached_power(int k) noexcept -> uint128_fallback { + return cache_accessor::get_cached_power(k); +} + +// Various integer checks +template +auto is_left_endpoint_integer_shorter_interval(int exponent) noexcept -> bool { + const int case_shorter_interval_left_endpoint_lower_threshold = 2; + const int case_shorter_interval_left_endpoint_upper_threshold = 3; + return exponent >= case_shorter_interval_left_endpoint_lower_threshold && + exponent <= case_shorter_interval_left_endpoint_upper_threshold; +} + +// Remove trailing zeros from n and return the number of zeros removed (float) +FMT_INLINE int remove_trailing_zeros(uint32_t& n, int s = 0) noexcept { + FMT_ASSERT(n != 0, ""); + // Modular inverse of 5 (mod 2^32): (mod_inv_5 * 5) mod 2^32 = 1. + constexpr uint32_t mod_inv_5 = 0xcccccccd; + constexpr uint32_t mod_inv_25 = 0xc28f5c29; // = mod_inv_5 * mod_inv_5 + + while (true) { + auto q = rotr(n * mod_inv_25, 2); + if (q > max_value() / 100) break; + n = q; + s += 2; + } + auto q = rotr(n * mod_inv_5, 1); + if (q <= max_value() / 10) { + n = q; + s |= 1; + } + return s; +} + +// Removes trailing zeros and returns the number of zeros removed (double) +FMT_INLINE int remove_trailing_zeros(uint64_t& n) noexcept { + FMT_ASSERT(n != 0, ""); + + // This magic number is ceil(2^90 / 10^8). + constexpr uint64_t magic_number = 12379400392853802749ull; + auto nm = umul128(n, magic_number); + + // Is n is divisible by 10^8? + if ((nm.high() & ((1ull << (90 - 64)) - 1)) == 0 && nm.low() < magic_number) { + // If yes, work with the quotient... + auto n32 = static_cast(nm.high() >> (90 - 64)); + // ... and use the 32 bit variant of the function + int s = remove_trailing_zeros(n32, 8); + n = n32; + return s; + } + + // If n is not divisible by 10^8, work with n itself. + constexpr uint64_t mod_inv_5 = 0xcccccccccccccccd; + constexpr uint64_t mod_inv_25 = 0x8f5c28f5c28f5c29; // mod_inv_5 * mod_inv_5 + + int s = 0; + while (true) { + auto q = rotr(n * mod_inv_25, 2); + if (q > max_value() / 100) break; + n = q; + s += 2; + } + auto q = rotr(n * mod_inv_5, 1); + if (q <= max_value() / 10) { + n = q; + s |= 1; + } + + return s; +} + +// The main algorithm for shorter interval case +template +FMT_INLINE decimal_fp shorter_interval_case(int exponent) noexcept { + decimal_fp ret_value; + // Compute k and beta + const int minus_k = floor_log10_pow2_minus_log10_4_over_3(exponent); + const int beta = exponent + floor_log2_pow10(-minus_k); + + // Compute xi and zi + using cache_entry_type = typename cache_accessor::cache_entry_type; + const cache_entry_type cache = cache_accessor::get_cached_power(-minus_k); + + auto xi = cache_accessor::compute_left_endpoint_for_shorter_interval_case( + cache, beta); + auto zi = cache_accessor::compute_right_endpoint_for_shorter_interval_case( + cache, beta); + + // If the left endpoint is not an integer, increase it + if (!is_left_endpoint_integer_shorter_interval(exponent)) ++xi; + + // Try bigger divisor + ret_value.significand = zi / 10; + + // If succeed, remove trailing zeros if necessary and return + if (ret_value.significand * 10 >= xi) { + ret_value.exponent = minus_k + 1; + ret_value.exponent += remove_trailing_zeros(ret_value.significand); + return ret_value; + } + + // Otherwise, compute the round-up of y + ret_value.significand = + cache_accessor::compute_round_up_for_shorter_interval_case(cache, + beta); + ret_value.exponent = minus_k; + + // When tie occurs, choose one of them according to the rule + if (exponent >= float_info::shorter_interval_tie_lower_threshold && + exponent <= float_info::shorter_interval_tie_upper_threshold) { + ret_value.significand = ret_value.significand % 2 == 0 + ? ret_value.significand + : ret_value.significand - 1; + } else if (ret_value.significand < xi) { + ++ret_value.significand; + } + return ret_value; +} + +template auto to_decimal(T x) noexcept -> decimal_fp { + // Step 1: integer promotion & Schubfach multiplier calculation. + + using carrier_uint = typename float_info::carrier_uint; + using cache_entry_type = typename cache_accessor::cache_entry_type; + auto br = bit_cast(x); + + // Extract significand bits and exponent bits. + const carrier_uint significand_mask = + (static_cast(1) << num_significand_bits()) - 1; + carrier_uint significand = (br & significand_mask); + int exponent = + static_cast((br & exponent_mask()) >> num_significand_bits()); + + if (exponent != 0) { // Check if normal. + exponent -= exponent_bias() + num_significand_bits(); + + // Shorter interval case; proceed like Schubfach. + // In fact, when exponent == 1 and significand == 0, the interval is + // regular. However, it can be shown that the end-results are anyway same. + if (significand == 0) return shorter_interval_case(exponent); + + significand |= (static_cast(1) << num_significand_bits()); + } else { + // Subnormal case; the interval is always regular. + if (significand == 0) return {0, 0}; + exponent = + std::numeric_limits::min_exponent - num_significand_bits() - 1; + } + + const bool include_left_endpoint = (significand % 2 == 0); + const bool include_right_endpoint = include_left_endpoint; + + // Compute k and beta. + const int minus_k = floor_log10_pow2(exponent) - float_info::kappa; + const cache_entry_type cache = cache_accessor::get_cached_power(-minus_k); + const int beta = exponent + floor_log2_pow10(-minus_k); + + // Compute zi and deltai. + // 10^kappa <= deltai < 10^(kappa + 1) + const uint32_t deltai = cache_accessor::compute_delta(cache, beta); + const carrier_uint two_fc = significand << 1; + + // For the case of binary32, the result of integer check is not correct for + // 29711844 * 2^-82 + // = 6.1442653300000000008655037797566933477355632930994033813476... * 10^-18 + // and 29711844 * 2^-81 + // = 1.2288530660000000001731007559513386695471126586198806762695... * 10^-17, + // and they are the unique counterexamples. However, since 29711844 is even, + // this does not cause any problem for the endpoints calculations; it can only + // cause a problem when we need to perform integer check for the center. + // Fortunately, with these inputs, that branch is never executed, so we are + // fine. + const typename cache_accessor::compute_mul_result z_mul = + cache_accessor::compute_mul((two_fc | 1) << beta, cache); + + // Step 2: Try larger divisor; remove trailing zeros if necessary. + + // Using an upper bound on zi, we might be able to optimize the division + // better than the compiler; we are computing zi / big_divisor here. + decimal_fp ret_value; + ret_value.significand = divide_by_10_to_kappa_plus_1(z_mul.result); + uint32_t r = static_cast(z_mul.result - float_info::big_divisor * + ret_value.significand); + + if (r < deltai) { + // Exclude the right endpoint if necessary. + if (r == 0 && (z_mul.is_integer & !include_right_endpoint)) { + --ret_value.significand; + r = float_info::big_divisor; + goto small_divisor_case_label; + } + } else if (r > deltai) { + goto small_divisor_case_label; + } else { + // r == deltai; compare fractional parts. + const typename cache_accessor::compute_mul_parity_result x_mul = + cache_accessor::compute_mul_parity(two_fc - 1, cache, beta); + + if (!(x_mul.parity | (x_mul.is_integer & include_left_endpoint))) + goto small_divisor_case_label; + } + ret_value.exponent = minus_k + float_info::kappa + 1; + + // We may need to remove trailing zeros. + ret_value.exponent += remove_trailing_zeros(ret_value.significand); + return ret_value; + + // Step 3: Find the significand with the smaller divisor. + +small_divisor_case_label: + ret_value.significand *= 10; + ret_value.exponent = minus_k + float_info::kappa; + + uint32_t dist = r - (deltai / 2) + (float_info::small_divisor / 2); + const bool approx_y_parity = + ((dist ^ (float_info::small_divisor / 2)) & 1) != 0; + + // Is dist divisible by 10^kappa? + const bool divisible_by_small_divisor = + check_divisibility_and_divide_by_pow10::kappa>(dist); + + // Add dist / 10^kappa to the significand. + ret_value.significand += dist; + + if (!divisible_by_small_divisor) return ret_value; + + // Check z^(f) >= epsilon^(f). + // We have either yi == zi - epsiloni or yi == (zi - epsiloni) - 1, + // where yi == zi - epsiloni if and only if z^(f) >= epsilon^(f). + // Since there are only 2 possibilities, we only need to care about the + // parity. Also, zi and r should have the same parity since the divisor + // is an even number. + const auto y_mul = cache_accessor::compute_mul_parity(two_fc, cache, beta); + + // If z^(f) >= epsilon^(f), we might have a tie when z^(f) == epsilon^(f), + // or equivalently, when y is an integer. + if (y_mul.parity != approx_y_parity) + --ret_value.significand; + else if (y_mul.is_integer & (ret_value.significand % 2 != 0)) + --ret_value.significand; + return ret_value; +} +} // namespace dragonbox +} // namespace detail + +template <> struct formatter { + FMT_CONSTEXPR auto parse(format_parse_context& ctx) + -> format_parse_context::iterator { + return ctx.begin(); + } + + auto format(const detail::bigint& n, format_context& ctx) const + -> format_context::iterator { + auto out = ctx.out(); + bool first = true; + for (auto i = n.bigits_.size(); i > 0; --i) { + auto value = n.bigits_[i - 1u]; + if (first) { + out = fmt::format_to(out, FMT_STRING("{:x}"), value); + first = false; + continue; + } + out = fmt::format_to(out, FMT_STRING("{:08x}"), value); + } + if (n.exp_ > 0) + out = fmt::format_to(out, FMT_STRING("p{}"), + n.exp_ * detail::bigint::bigit_bits); + return out; + } +}; + +FMT_FUNC detail::utf8_to_utf16::utf8_to_utf16(string_view s) { + for_each_codepoint(s, [this](uint32_t cp, string_view) { + if (cp == invalid_code_point) FMT_THROW(std::runtime_error("invalid utf8")); + if (cp <= 0xFFFF) { + buffer_.push_back(static_cast(cp)); + } else { + cp -= 0x10000; + buffer_.push_back(static_cast(0xD800 + (cp >> 10))); + buffer_.push_back(static_cast(0xDC00 + (cp & 0x3FF))); + } + return true; + }); + buffer_.push_back(0); +} + +FMT_FUNC void format_system_error(detail::buffer& out, int error_code, + const char* message) noexcept { + FMT_TRY { + auto ec = std::error_code(error_code, std::generic_category()); + write(std::back_inserter(out), std::system_error(ec, message).what()); + return; + } + FMT_CATCH(...) {} + format_error_code(out, error_code, message); +} + +FMT_FUNC void report_system_error(int error_code, + const char* message) noexcept { + report_error(format_system_error, error_code, message); +} + +FMT_FUNC auto vformat(string_view fmt, format_args args) -> std::string { + // Don't optimize the "{}" case to keep the binary size small and because it + // can be better optimized in fmt::format anyway. + auto buffer = memory_buffer(); + detail::vformat_to(buffer, fmt, args); + return to_string(buffer); +} + +namespace detail { +#if !defined(_WIN32) || defined(FMT_WINDOWS_NO_WCHAR) +FMT_FUNC auto write_console(int, string_view) -> bool { return false; } +FMT_FUNC auto write_console(std::FILE*, string_view) -> bool { return false; } +#else +using dword = conditional_t; +extern "C" __declspec(dllimport) int __stdcall WriteConsoleW( // + void*, const void*, dword, dword*, void*); + +FMT_FUNC bool write_console(int fd, string_view text) { + auto u16 = utf8_to_utf16(text); + return WriteConsoleW(reinterpret_cast(_get_osfhandle(fd)), u16.c_str(), + static_cast(u16.size()), nullptr, nullptr) != 0; +} + +FMT_FUNC auto write_console(std::FILE* f, string_view text) -> bool { + return write_console(_fileno(f), text); +} +#endif + +#ifdef _WIN32 +// Print assuming legacy (non-Unicode) encoding. +FMT_FUNC void vprint_mojibake(std::FILE* f, string_view fmt, format_args args) { + auto buffer = memory_buffer(); + detail::vformat_to(buffer, fmt, args); + fwrite_fully(buffer.data(), buffer.size(), f); +} +#endif + +FMT_FUNC void print(std::FILE* f, string_view text) { +#ifdef _WIN32 + int fd = _fileno(f); + if (_isatty(fd)) { + std::fflush(f); + if (write_console(fd, text)) return; + } +#endif + fwrite_fully(text.data(), text.size(), f); +} +} // namespace detail + +FMT_FUNC void vprint(std::FILE* f, string_view fmt, format_args args) { + auto buffer = memory_buffer(); + detail::vformat_to(buffer, fmt, args); + detail::print(f, {buffer.data(), buffer.size()}); +} + +FMT_FUNC void vprint(string_view fmt, format_args args) { + vprint(stdout, fmt, args); +} + +namespace detail { + +struct singleton { + unsigned char upper; + unsigned char lower_count; +}; + +inline auto is_printable(uint16_t x, const singleton* singletons, + size_t singletons_size, + const unsigned char* singleton_lowers, + const unsigned char* normal, size_t normal_size) + -> bool { + auto upper = x >> 8; + auto lower_start = 0; + for (size_t i = 0; i < singletons_size; ++i) { + auto s = singletons[i]; + auto lower_end = lower_start + s.lower_count; + if (upper < s.upper) break; + if (upper == s.upper) { + for (auto j = lower_start; j < lower_end; ++j) { + if (singleton_lowers[j] == (x & 0xff)) return false; + } + } + lower_start = lower_end; + } + + auto xsigned = static_cast(x); + auto current = true; + for (size_t i = 0; i < normal_size; ++i) { + auto v = static_cast(normal[i]); + auto len = (v & 0x80) != 0 ? (v & 0x7f) << 8 | normal[++i] : v; + xsigned -= len; + if (xsigned < 0) break; + current = !current; + } + return current; +} + +// This code is generated by support/printable.py. +FMT_FUNC auto is_printable(uint32_t cp) -> bool { + static constexpr singleton singletons0[] = { + {0x00, 1}, {0x03, 5}, {0x05, 6}, {0x06, 3}, {0x07, 6}, {0x08, 8}, + {0x09, 17}, {0x0a, 28}, {0x0b, 25}, {0x0c, 20}, {0x0d, 16}, {0x0e, 13}, + {0x0f, 4}, {0x10, 3}, {0x12, 18}, {0x13, 9}, {0x16, 1}, {0x17, 5}, + {0x18, 2}, {0x19, 3}, {0x1a, 7}, {0x1c, 2}, {0x1d, 1}, {0x1f, 22}, + {0x20, 3}, {0x2b, 3}, {0x2c, 2}, {0x2d, 11}, {0x2e, 1}, {0x30, 3}, + {0x31, 2}, {0x32, 1}, {0xa7, 2}, {0xa9, 2}, {0xaa, 4}, {0xab, 8}, + {0xfa, 2}, {0xfb, 5}, {0xfd, 4}, {0xfe, 3}, {0xff, 9}, + }; + static constexpr unsigned char singletons0_lower[] = { + 0xad, 0x78, 0x79, 0x8b, 0x8d, 0xa2, 0x30, 0x57, 0x58, 0x8b, 0x8c, 0x90, + 0x1c, 0x1d, 0xdd, 0x0e, 0x0f, 0x4b, 0x4c, 0xfb, 0xfc, 0x2e, 0x2f, 0x3f, + 0x5c, 0x5d, 0x5f, 0xb5, 0xe2, 0x84, 0x8d, 0x8e, 0x91, 0x92, 0xa9, 0xb1, + 0xba, 0xbb, 0xc5, 0xc6, 0xc9, 0xca, 0xde, 0xe4, 0xe5, 0xff, 0x00, 0x04, + 0x11, 0x12, 0x29, 0x31, 0x34, 0x37, 0x3a, 0x3b, 0x3d, 0x49, 0x4a, 0x5d, + 0x84, 0x8e, 0x92, 0xa9, 0xb1, 0xb4, 0xba, 0xbb, 0xc6, 0xca, 0xce, 0xcf, + 0xe4, 0xe5, 0x00, 0x04, 0x0d, 0x0e, 0x11, 0x12, 0x29, 0x31, 0x34, 0x3a, + 0x3b, 0x45, 0x46, 0x49, 0x4a, 0x5e, 0x64, 0x65, 0x84, 0x91, 0x9b, 0x9d, + 0xc9, 0xce, 0xcf, 0x0d, 0x11, 0x29, 0x45, 0x49, 0x57, 0x64, 0x65, 0x8d, + 0x91, 0xa9, 0xb4, 0xba, 0xbb, 0xc5, 0xc9, 0xdf, 0xe4, 0xe5, 0xf0, 0x0d, + 0x11, 0x45, 0x49, 0x64, 0x65, 0x80, 0x84, 0xb2, 0xbc, 0xbe, 0xbf, 0xd5, + 0xd7, 0xf0, 0xf1, 0x83, 0x85, 0x8b, 0xa4, 0xa6, 0xbe, 0xbf, 0xc5, 0xc7, + 0xce, 0xcf, 0xda, 0xdb, 0x48, 0x98, 0xbd, 0xcd, 0xc6, 0xce, 0xcf, 0x49, + 0x4e, 0x4f, 0x57, 0x59, 0x5e, 0x5f, 0x89, 0x8e, 0x8f, 0xb1, 0xb6, 0xb7, + 0xbf, 0xc1, 0xc6, 0xc7, 0xd7, 0x11, 0x16, 0x17, 0x5b, 0x5c, 0xf6, 0xf7, + 0xfe, 0xff, 0x80, 0x0d, 0x6d, 0x71, 0xde, 0xdf, 0x0e, 0x0f, 0x1f, 0x6e, + 0x6f, 0x1c, 0x1d, 0x5f, 0x7d, 0x7e, 0xae, 0xaf, 0xbb, 0xbc, 0xfa, 0x16, + 0x17, 0x1e, 0x1f, 0x46, 0x47, 0x4e, 0x4f, 0x58, 0x5a, 0x5c, 0x5e, 0x7e, + 0x7f, 0xb5, 0xc5, 0xd4, 0xd5, 0xdc, 0xf0, 0xf1, 0xf5, 0x72, 0x73, 0x8f, + 0x74, 0x75, 0x96, 0x2f, 0x5f, 0x26, 0x2e, 0x2f, 0xa7, 0xaf, 0xb7, 0xbf, + 0xc7, 0xcf, 0xd7, 0xdf, 0x9a, 0x40, 0x97, 0x98, 0x30, 0x8f, 0x1f, 0xc0, + 0xc1, 0xce, 0xff, 0x4e, 0x4f, 0x5a, 0x5b, 0x07, 0x08, 0x0f, 0x10, 0x27, + 0x2f, 0xee, 0xef, 0x6e, 0x6f, 0x37, 0x3d, 0x3f, 0x42, 0x45, 0x90, 0x91, + 0xfe, 0xff, 0x53, 0x67, 0x75, 0xc8, 0xc9, 0xd0, 0xd1, 0xd8, 0xd9, 0xe7, + 0xfe, 0xff, + }; + static constexpr singleton singletons1[] = { + {0x00, 6}, {0x01, 1}, {0x03, 1}, {0x04, 2}, {0x08, 8}, {0x09, 2}, + {0x0a, 5}, {0x0b, 2}, {0x0e, 4}, {0x10, 1}, {0x11, 2}, {0x12, 5}, + {0x13, 17}, {0x14, 1}, {0x15, 2}, {0x17, 2}, {0x19, 13}, {0x1c, 5}, + {0x1d, 8}, {0x24, 1}, {0x6a, 3}, {0x6b, 2}, {0xbc, 2}, {0xd1, 2}, + {0xd4, 12}, {0xd5, 9}, {0xd6, 2}, {0xd7, 2}, {0xda, 1}, {0xe0, 5}, + {0xe1, 2}, {0xe8, 2}, {0xee, 32}, {0xf0, 4}, {0xf8, 2}, {0xf9, 2}, + {0xfa, 2}, {0xfb, 1}, + }; + static constexpr unsigned char singletons1_lower[] = { + 0x0c, 0x27, 0x3b, 0x3e, 0x4e, 0x4f, 0x8f, 0x9e, 0x9e, 0x9f, 0x06, 0x07, + 0x09, 0x36, 0x3d, 0x3e, 0x56, 0xf3, 0xd0, 0xd1, 0x04, 0x14, 0x18, 0x36, + 0x37, 0x56, 0x57, 0x7f, 0xaa, 0xae, 0xaf, 0xbd, 0x35, 0xe0, 0x12, 0x87, + 0x89, 0x8e, 0x9e, 0x04, 0x0d, 0x0e, 0x11, 0x12, 0x29, 0x31, 0x34, 0x3a, + 0x45, 0x46, 0x49, 0x4a, 0x4e, 0x4f, 0x64, 0x65, 0x5c, 0xb6, 0xb7, 0x1b, + 0x1c, 0x07, 0x08, 0x0a, 0x0b, 0x14, 0x17, 0x36, 0x39, 0x3a, 0xa8, 0xa9, + 0xd8, 0xd9, 0x09, 0x37, 0x90, 0x91, 0xa8, 0x07, 0x0a, 0x3b, 0x3e, 0x66, + 0x69, 0x8f, 0x92, 0x6f, 0x5f, 0xee, 0xef, 0x5a, 0x62, 0x9a, 0x9b, 0x27, + 0x28, 0x55, 0x9d, 0xa0, 0xa1, 0xa3, 0xa4, 0xa7, 0xa8, 0xad, 0xba, 0xbc, + 0xc4, 0x06, 0x0b, 0x0c, 0x15, 0x1d, 0x3a, 0x3f, 0x45, 0x51, 0xa6, 0xa7, + 0xcc, 0xcd, 0xa0, 0x07, 0x19, 0x1a, 0x22, 0x25, 0x3e, 0x3f, 0xc5, 0xc6, + 0x04, 0x20, 0x23, 0x25, 0x26, 0x28, 0x33, 0x38, 0x3a, 0x48, 0x4a, 0x4c, + 0x50, 0x53, 0x55, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x63, 0x65, 0x66, + 0x6b, 0x73, 0x78, 0x7d, 0x7f, 0x8a, 0xa4, 0xaa, 0xaf, 0xb0, 0xc0, 0xd0, + 0xae, 0xaf, 0x79, 0xcc, 0x6e, 0x6f, 0x93, + }; + static constexpr unsigned char normal0[] = { + 0x00, 0x20, 0x5f, 0x22, 0x82, 0xdf, 0x04, 0x82, 0x44, 0x08, 0x1b, 0x04, + 0x06, 0x11, 0x81, 0xac, 0x0e, 0x80, 0xab, 0x35, 0x28, 0x0b, 0x80, 0xe0, + 0x03, 0x19, 0x08, 0x01, 0x04, 0x2f, 0x04, 0x34, 0x04, 0x07, 0x03, 0x01, + 0x07, 0x06, 0x07, 0x11, 0x0a, 0x50, 0x0f, 0x12, 0x07, 0x55, 0x07, 0x03, + 0x04, 0x1c, 0x0a, 0x09, 0x03, 0x08, 0x03, 0x07, 0x03, 0x02, 0x03, 0x03, + 0x03, 0x0c, 0x04, 0x05, 0x03, 0x0b, 0x06, 0x01, 0x0e, 0x15, 0x05, 0x3a, + 0x03, 0x11, 0x07, 0x06, 0x05, 0x10, 0x07, 0x57, 0x07, 0x02, 0x07, 0x15, + 0x0d, 0x50, 0x04, 0x43, 0x03, 0x2d, 0x03, 0x01, 0x04, 0x11, 0x06, 0x0f, + 0x0c, 0x3a, 0x04, 0x1d, 0x25, 0x5f, 0x20, 0x6d, 0x04, 0x6a, 0x25, 0x80, + 0xc8, 0x05, 0x82, 0xb0, 0x03, 0x1a, 0x06, 0x82, 0xfd, 0x03, 0x59, 0x07, + 0x15, 0x0b, 0x17, 0x09, 0x14, 0x0c, 0x14, 0x0c, 0x6a, 0x06, 0x0a, 0x06, + 0x1a, 0x06, 0x59, 0x07, 0x2b, 0x05, 0x46, 0x0a, 0x2c, 0x04, 0x0c, 0x04, + 0x01, 0x03, 0x31, 0x0b, 0x2c, 0x04, 0x1a, 0x06, 0x0b, 0x03, 0x80, 0xac, + 0x06, 0x0a, 0x06, 0x21, 0x3f, 0x4c, 0x04, 0x2d, 0x03, 0x74, 0x08, 0x3c, + 0x03, 0x0f, 0x03, 0x3c, 0x07, 0x38, 0x08, 0x2b, 0x05, 0x82, 0xff, 0x11, + 0x18, 0x08, 0x2f, 0x11, 0x2d, 0x03, 0x20, 0x10, 0x21, 0x0f, 0x80, 0x8c, + 0x04, 0x82, 0x97, 0x19, 0x0b, 0x15, 0x88, 0x94, 0x05, 0x2f, 0x05, 0x3b, + 0x07, 0x02, 0x0e, 0x18, 0x09, 0x80, 0xb3, 0x2d, 0x74, 0x0c, 0x80, 0xd6, + 0x1a, 0x0c, 0x05, 0x80, 0xff, 0x05, 0x80, 0xdf, 0x0c, 0xee, 0x0d, 0x03, + 0x84, 0x8d, 0x03, 0x37, 0x09, 0x81, 0x5c, 0x14, 0x80, 0xb8, 0x08, 0x80, + 0xcb, 0x2a, 0x38, 0x03, 0x0a, 0x06, 0x38, 0x08, 0x46, 0x08, 0x0c, 0x06, + 0x74, 0x0b, 0x1e, 0x03, 0x5a, 0x04, 0x59, 0x09, 0x80, 0x83, 0x18, 0x1c, + 0x0a, 0x16, 0x09, 0x4c, 0x04, 0x80, 0x8a, 0x06, 0xab, 0xa4, 0x0c, 0x17, + 0x04, 0x31, 0xa1, 0x04, 0x81, 0xda, 0x26, 0x07, 0x0c, 0x05, 0x05, 0x80, + 0xa5, 0x11, 0x81, 0x6d, 0x10, 0x78, 0x28, 0x2a, 0x06, 0x4c, 0x04, 0x80, + 0x8d, 0x04, 0x80, 0xbe, 0x03, 0x1b, 0x03, 0x0f, 0x0d, + }; + static constexpr unsigned char normal1[] = { + 0x5e, 0x22, 0x7b, 0x05, 0x03, 0x04, 0x2d, 0x03, 0x66, 0x03, 0x01, 0x2f, + 0x2e, 0x80, 0x82, 0x1d, 0x03, 0x31, 0x0f, 0x1c, 0x04, 0x24, 0x09, 0x1e, + 0x05, 0x2b, 0x05, 0x44, 0x04, 0x0e, 0x2a, 0x80, 0xaa, 0x06, 0x24, 0x04, + 0x24, 0x04, 0x28, 0x08, 0x34, 0x0b, 0x01, 0x80, 0x90, 0x81, 0x37, 0x09, + 0x16, 0x0a, 0x08, 0x80, 0x98, 0x39, 0x03, 0x63, 0x08, 0x09, 0x30, 0x16, + 0x05, 0x21, 0x03, 0x1b, 0x05, 0x01, 0x40, 0x38, 0x04, 0x4b, 0x05, 0x2f, + 0x04, 0x0a, 0x07, 0x09, 0x07, 0x40, 0x20, 0x27, 0x04, 0x0c, 0x09, 0x36, + 0x03, 0x3a, 0x05, 0x1a, 0x07, 0x04, 0x0c, 0x07, 0x50, 0x49, 0x37, 0x33, + 0x0d, 0x33, 0x07, 0x2e, 0x08, 0x0a, 0x81, 0x26, 0x52, 0x4e, 0x28, 0x08, + 0x2a, 0x56, 0x1c, 0x14, 0x17, 0x09, 0x4e, 0x04, 0x1e, 0x0f, 0x43, 0x0e, + 0x19, 0x07, 0x0a, 0x06, 0x48, 0x08, 0x27, 0x09, 0x75, 0x0b, 0x3f, 0x41, + 0x2a, 0x06, 0x3b, 0x05, 0x0a, 0x06, 0x51, 0x06, 0x01, 0x05, 0x10, 0x03, + 0x05, 0x80, 0x8b, 0x62, 0x1e, 0x48, 0x08, 0x0a, 0x80, 0xa6, 0x5e, 0x22, + 0x45, 0x0b, 0x0a, 0x06, 0x0d, 0x13, 0x39, 0x07, 0x0a, 0x36, 0x2c, 0x04, + 0x10, 0x80, 0xc0, 0x3c, 0x64, 0x53, 0x0c, 0x48, 0x09, 0x0a, 0x46, 0x45, + 0x1b, 0x48, 0x08, 0x53, 0x1d, 0x39, 0x81, 0x07, 0x46, 0x0a, 0x1d, 0x03, + 0x47, 0x49, 0x37, 0x03, 0x0e, 0x08, 0x0a, 0x06, 0x39, 0x07, 0x0a, 0x81, + 0x36, 0x19, 0x80, 0xb7, 0x01, 0x0f, 0x32, 0x0d, 0x83, 0x9b, 0x66, 0x75, + 0x0b, 0x80, 0xc4, 0x8a, 0xbc, 0x84, 0x2f, 0x8f, 0xd1, 0x82, 0x47, 0xa1, + 0xb9, 0x82, 0x39, 0x07, 0x2a, 0x04, 0x02, 0x60, 0x26, 0x0a, 0x46, 0x0a, + 0x28, 0x05, 0x13, 0x82, 0xb0, 0x5b, 0x65, 0x4b, 0x04, 0x39, 0x07, 0x11, + 0x40, 0x05, 0x0b, 0x02, 0x0e, 0x97, 0xf8, 0x08, 0x84, 0xd6, 0x2a, 0x09, + 0xa2, 0xf7, 0x81, 0x1f, 0x31, 0x03, 0x11, 0x04, 0x08, 0x81, 0x8c, 0x89, + 0x04, 0x6b, 0x05, 0x0d, 0x03, 0x09, 0x07, 0x10, 0x93, 0x60, 0x80, 0xf6, + 0x0a, 0x73, 0x08, 0x6e, 0x17, 0x46, 0x80, 0x9a, 0x14, 0x0c, 0x57, 0x09, + 0x19, 0x80, 0x87, 0x81, 0x47, 0x03, 0x85, 0x42, 0x0f, 0x15, 0x85, 0x50, + 0x2b, 0x80, 0xd5, 0x2d, 0x03, 0x1a, 0x04, 0x02, 0x81, 0x70, 0x3a, 0x05, + 0x01, 0x85, 0x00, 0x80, 0xd7, 0x29, 0x4c, 0x04, 0x0a, 0x04, 0x02, 0x83, + 0x11, 0x44, 0x4c, 0x3d, 0x80, 0xc2, 0x3c, 0x06, 0x01, 0x04, 0x55, 0x05, + 0x1b, 0x34, 0x02, 0x81, 0x0e, 0x2c, 0x04, 0x64, 0x0c, 0x56, 0x0a, 0x80, + 0xae, 0x38, 0x1d, 0x0d, 0x2c, 0x04, 0x09, 0x07, 0x02, 0x0e, 0x06, 0x80, + 0x9a, 0x83, 0xd8, 0x08, 0x0d, 0x03, 0x0d, 0x03, 0x74, 0x0c, 0x59, 0x07, + 0x0c, 0x14, 0x0c, 0x04, 0x38, 0x08, 0x0a, 0x06, 0x28, 0x08, 0x22, 0x4e, + 0x81, 0x54, 0x0c, 0x15, 0x03, 0x03, 0x05, 0x07, 0x09, 0x19, 0x07, 0x07, + 0x09, 0x03, 0x0d, 0x07, 0x29, 0x80, 0xcb, 0x25, 0x0a, 0x84, 0x06, + }; + auto lower = static_cast(cp); + if (cp < 0x10000) { + return is_printable(lower, singletons0, + sizeof(singletons0) / sizeof(*singletons0), + singletons0_lower, normal0, sizeof(normal0)); + } + if (cp < 0x20000) { + return is_printable(lower, singletons1, + sizeof(singletons1) / sizeof(*singletons1), + singletons1_lower, normal1, sizeof(normal1)); + } + if (0x2a6de <= cp && cp < 0x2a700) return false; + if (0x2b735 <= cp && cp < 0x2b740) return false; + if (0x2b81e <= cp && cp < 0x2b820) return false; + if (0x2cea2 <= cp && cp < 0x2ceb0) return false; + if (0x2ebe1 <= cp && cp < 0x2f800) return false; + if (0x2fa1e <= cp && cp < 0x30000) return false; + if (0x3134b <= cp && cp < 0xe0100) return false; + if (0xe01f0 <= cp && cp < 0x110000) return false; + return cp < 0x110000; +} + +} // namespace detail + +FMT_END_NAMESPACE + +#endif // FMT_FORMAT_INL_H_ diff --git a/vm/fmt/format.h b/vm/fmt/format.h new file mode 100644 index 0000000000..7637c8a0d0 --- /dev/null +++ b/vm/fmt/format.h @@ -0,0 +1,4535 @@ +/* + Formatting library for C++ + + Copyright (c) 2012 - present, Victor Zverovich + + Permission is hereby granted, free of charge, to any person obtaining + a copy of this software and associated documentation files (the + "Software"), to deal in the Software without restriction, including + without limitation the rights to use, copy, modify, merge, publish, + distribute, sublicense, and/or sell copies of the Software, and to + permit persons to whom the Software is furnished to do so, subject to + the following conditions: + + The above copyright notice and this permission notice shall be + included in all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + + --- Optional exception to the license --- + + As an exception, if, as a result of your compiling your source code, portions + of this Software are embedded into a machine-executable object form of such + source code, you may redistribute such embedded portions in such object form + without including the above copyright and permission notices. + */ + +#ifndef FMT_FORMAT_H_ +#define FMT_FORMAT_H_ + +#include // std::signbit +#include // uint32_t +#include // std::memcpy +#include // std::initializer_list +#include // std::numeric_limits +#include // std::uninitialized_copy +#include // std::runtime_error +#include // std::system_error + +#ifdef __cpp_lib_bit_cast +# include // std::bit_cast +#endif + +#include "core.h" + +#if defined __cpp_inline_variables && __cpp_inline_variables >= 201606L +# define FMT_INLINE_VARIABLE inline +#else +# define FMT_INLINE_VARIABLE +#endif + +#if FMT_HAS_CPP17_ATTRIBUTE(fallthrough) +# define FMT_FALLTHROUGH [[fallthrough]] +#elif defined(__clang__) +# define FMT_FALLTHROUGH [[clang::fallthrough]] +#elif FMT_GCC_VERSION >= 700 && \ + (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= 520) +# define FMT_FALLTHROUGH [[gnu::fallthrough]] +#else +# define FMT_FALLTHROUGH +#endif + +#ifndef FMT_DEPRECATED +# if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VERSION >= 1900 +# define FMT_DEPRECATED [[deprecated]] +# else +# if (defined(__GNUC__) && !defined(__LCC__)) || defined(__clang__) +# define FMT_DEPRECATED __attribute__((deprecated)) +# elif FMT_MSC_VERSION +# define FMT_DEPRECATED __declspec(deprecated) +# else +# define FMT_DEPRECATED /* deprecated */ +# endif +# endif +#endif + +#ifndef FMT_NO_UNIQUE_ADDRESS +# if FMT_CPLUSPLUS >= 202002L +# if FMT_HAS_CPP_ATTRIBUTE(no_unique_address) +# define FMT_NO_UNIQUE_ADDRESS [[no_unique_address]] +// VS2019 v16.10 and later except clang-cl (https://reviews.llvm.org/D110485) +# elif (FMT_MSC_VERSION >= 1929) && !FMT_CLANG_VERSION +# define FMT_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]] +# endif +# endif +#endif +#ifndef FMT_NO_UNIQUE_ADDRESS +# define FMT_NO_UNIQUE_ADDRESS +#endif + +// Visibility when compiled as a shared library/object. +#if defined(FMT_LIB_EXPORT) || defined(FMT_SHARED) +# define FMT_SO_VISIBILITY(value) FMT_VISIBILITY(value) +#else +# define FMT_SO_VISIBILITY(value) +#endif + +#ifdef __has_builtin +# define FMT_HAS_BUILTIN(x) __has_builtin(x) +#else +# define FMT_HAS_BUILTIN(x) 0 +#endif + +#if FMT_GCC_VERSION || FMT_CLANG_VERSION +# define FMT_NOINLINE __attribute__((noinline)) +#else +# define FMT_NOINLINE +#endif + +#ifndef FMT_THROW +# if FMT_EXCEPTIONS +# if FMT_MSC_VERSION || defined(__NVCC__) +FMT_BEGIN_NAMESPACE +namespace detail { +template inline void do_throw(const Exception& x) { + // Silence unreachable code warnings in MSVC and NVCC because these + // are nearly impossible to fix in a generic code. + volatile bool b = true; + if (b) throw x; +} +} // namespace detail +FMT_END_NAMESPACE +# define FMT_THROW(x) detail::do_throw(x) +# else +# define FMT_THROW(x) throw x +# endif +# else +# define FMT_THROW(x) \ + ::fmt::detail::assert_fail(__FILE__, __LINE__, (x).what()) +# endif +#endif + +#if FMT_EXCEPTIONS +# define FMT_TRY try +# define FMT_CATCH(x) catch (x) +#else +# define FMT_TRY if (true) +# define FMT_CATCH(x) if (false) +#endif + +#ifndef FMT_MAYBE_UNUSED +# if FMT_HAS_CPP17_ATTRIBUTE(maybe_unused) +# define FMT_MAYBE_UNUSED [[maybe_unused]] +# else +# define FMT_MAYBE_UNUSED +# endif +#endif + +#ifndef FMT_USE_USER_DEFINED_LITERALS +// EDG based compilers (Intel, NVIDIA, Elbrus, etc), GCC and MSVC support UDLs. +// +// GCC before 4.9 requires a space in `operator"" _a` which is invalid in later +// compiler versions. +# if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 409 || \ + FMT_MSC_VERSION >= 1900) && \ + (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= /* UDL feature */ 480) +# define FMT_USE_USER_DEFINED_LITERALS 1 +# else +# define FMT_USE_USER_DEFINED_LITERALS 0 +# endif +#endif + +// Defining FMT_REDUCE_INT_INSTANTIATIONS to 1, will reduce the number of +// integer formatter template instantiations to just one by only using the +// largest integer type. This results in a reduction in binary size but will +// cause a decrease in integer formatting performance. +#if !defined(FMT_REDUCE_INT_INSTANTIATIONS) +# define FMT_REDUCE_INT_INSTANTIATIONS 0 +#endif + +// __builtin_clz is broken in clang with Microsoft CodeGen: +// https://github.com/fmtlib/fmt/issues/519. +#if !FMT_MSC_VERSION +# if FMT_HAS_BUILTIN(__builtin_clz) || FMT_GCC_VERSION || FMT_ICC_VERSION +# define FMT_BUILTIN_CLZ(n) __builtin_clz(n) +# endif +# if FMT_HAS_BUILTIN(__builtin_clzll) || FMT_GCC_VERSION || FMT_ICC_VERSION +# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n) +# endif +#endif + +// __builtin_ctz is broken in Intel Compiler Classic on Windows: +// https://github.com/fmtlib/fmt/issues/2510. +#ifndef __ICL +# if FMT_HAS_BUILTIN(__builtin_ctz) || FMT_GCC_VERSION || FMT_ICC_VERSION || \ + defined(__NVCOMPILER) +# define FMT_BUILTIN_CTZ(n) __builtin_ctz(n) +# endif +# if FMT_HAS_BUILTIN(__builtin_ctzll) || FMT_GCC_VERSION || \ + FMT_ICC_VERSION || defined(__NVCOMPILER) +# define FMT_BUILTIN_CTZLL(n) __builtin_ctzll(n) +# endif +#endif + +#if FMT_MSC_VERSION +# include // _BitScanReverse[64], _BitScanForward[64], _umul128 +#endif + +// Some compilers masquerade as both MSVC and GCC-likes or otherwise support +// __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the +// MSVC intrinsics if the clz and clzll builtins are not available. +#if FMT_MSC_VERSION && !defined(FMT_BUILTIN_CLZLL) && \ + !defined(FMT_BUILTIN_CTZLL) +FMT_BEGIN_NAMESPACE +namespace detail { +// Avoid Clang with Microsoft CodeGen's -Wunknown-pragmas warning. +# if !defined(__clang__) +# pragma intrinsic(_BitScanForward) +# pragma intrinsic(_BitScanReverse) +# if defined(_WIN64) +# pragma intrinsic(_BitScanForward64) +# pragma intrinsic(_BitScanReverse64) +# endif +# endif + +inline auto clz(uint32_t x) -> int { + unsigned long r = 0; + _BitScanReverse(&r, x); + FMT_ASSERT(x != 0, ""); + // Static analysis complains about using uninitialized data + // "r", but the only way that can happen is if "x" is 0, + // which the callers guarantee to not happen. + FMT_MSC_WARNING(suppress : 6102) + return 31 ^ static_cast(r); +} +# define FMT_BUILTIN_CLZ(n) detail::clz(n) + +inline auto clzll(uint64_t x) -> int { + unsigned long r = 0; +# ifdef _WIN64 + _BitScanReverse64(&r, x); +# else + // Scan the high 32 bits. + if (_BitScanReverse(&r, static_cast(x >> 32))) + return 63 ^ static_cast(r + 32); + // Scan the low 32 bits. + _BitScanReverse(&r, static_cast(x)); +# endif + FMT_ASSERT(x != 0, ""); + FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning. + return 63 ^ static_cast(r); +} +# define FMT_BUILTIN_CLZLL(n) detail::clzll(n) + +inline auto ctz(uint32_t x) -> int { + unsigned long r = 0; + _BitScanForward(&r, x); + FMT_ASSERT(x != 0, ""); + FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning. + return static_cast(r); +} +# define FMT_BUILTIN_CTZ(n) detail::ctz(n) + +inline auto ctzll(uint64_t x) -> int { + unsigned long r = 0; + FMT_ASSERT(x != 0, ""); + FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning. +# ifdef _WIN64 + _BitScanForward64(&r, x); +# else + // Scan the low 32 bits. + if (_BitScanForward(&r, static_cast(x))) return static_cast(r); + // Scan the high 32 bits. + _BitScanForward(&r, static_cast(x >> 32)); + r += 32; +# endif + return static_cast(r); +} +# define FMT_BUILTIN_CTZLL(n) detail::ctzll(n) +} // namespace detail +FMT_END_NAMESPACE +#endif + +FMT_BEGIN_NAMESPACE +namespace detail { + +FMT_CONSTEXPR inline void abort_fuzzing_if(bool condition) { + ignore_unused(condition); +#ifdef FMT_FUZZ + if (condition) throw std::runtime_error("fuzzing limit reached"); +#endif +} + +template struct string_literal { + static constexpr CharT value[sizeof...(C)] = {C...}; + constexpr operator basic_string_view() const { + return {value, sizeof...(C)}; + } +}; + +#if FMT_CPLUSPLUS < 201703L +template +constexpr CharT string_literal::value[sizeof...(C)]; +#endif + +// Implementation of std::bit_cast for pre-C++20. +template +FMT_CONSTEXPR20 auto bit_cast(const From& from) -> To { +#ifdef __cpp_lib_bit_cast + if (is_constant_evaluated()) return std::bit_cast(from); +#endif + auto to = To(); + // The cast suppresses a bogus -Wclass-memaccess on GCC. + std::memcpy(static_cast(&to), &from, sizeof(to)); + return to; +} + +inline auto is_big_endian() -> bool { +#ifdef _WIN32 + return false; +#elif defined(__BIG_ENDIAN__) + return true; +#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) + return __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__; +#else + struct bytes { + char data[sizeof(int)]; + }; + return bit_cast(1).data[0] == 0; +#endif +} + +class uint128_fallback { + private: + uint64_t lo_, hi_; + + public: + constexpr uint128_fallback(uint64_t hi, uint64_t lo) : lo_(lo), hi_(hi) {} + constexpr uint128_fallback(uint64_t value = 0) : lo_(value), hi_(0) {} + + constexpr auto high() const noexcept -> uint64_t { return hi_; } + constexpr auto low() const noexcept -> uint64_t { return lo_; } + + template ::value)> + constexpr explicit operator T() const { + return static_cast(lo_); + } + + friend constexpr auto operator==(const uint128_fallback& lhs, + const uint128_fallback& rhs) -> bool { + return lhs.hi_ == rhs.hi_ && lhs.lo_ == rhs.lo_; + } + friend constexpr auto operator!=(const uint128_fallback& lhs, + const uint128_fallback& rhs) -> bool { + return !(lhs == rhs); + } + friend constexpr auto operator>(const uint128_fallback& lhs, + const uint128_fallback& rhs) -> bool { + return lhs.hi_ != rhs.hi_ ? lhs.hi_ > rhs.hi_ : lhs.lo_ > rhs.lo_; + } + friend constexpr auto operator|(const uint128_fallback& lhs, + const uint128_fallback& rhs) + -> uint128_fallback { + return {lhs.hi_ | rhs.hi_, lhs.lo_ | rhs.lo_}; + } + friend constexpr auto operator&(const uint128_fallback& lhs, + const uint128_fallback& rhs) + -> uint128_fallback { + return {lhs.hi_ & rhs.hi_, lhs.lo_ & rhs.lo_}; + } + friend constexpr auto operator~(const uint128_fallback& n) + -> uint128_fallback { + return {~n.hi_, ~n.lo_}; + } + friend auto operator+(const uint128_fallback& lhs, + const uint128_fallback& rhs) -> uint128_fallback { + auto result = uint128_fallback(lhs); + result += rhs; + return result; + } + friend auto operator*(const uint128_fallback& lhs, uint32_t rhs) + -> uint128_fallback { + FMT_ASSERT(lhs.hi_ == 0, ""); + uint64_t hi = (lhs.lo_ >> 32) * rhs; + uint64_t lo = (lhs.lo_ & ~uint32_t()) * rhs; + uint64_t new_lo = (hi << 32) + lo; + return {(hi >> 32) + (new_lo < lo ? 1 : 0), new_lo}; + } + friend auto operator-(const uint128_fallback& lhs, uint64_t rhs) + -> uint128_fallback { + return {lhs.hi_ - (lhs.lo_ < rhs ? 1 : 0), lhs.lo_ - rhs}; + } + FMT_CONSTEXPR auto operator>>(int shift) const -> uint128_fallback { + if (shift == 64) return {0, hi_}; + if (shift > 64) return uint128_fallback(0, hi_) >> (shift - 64); + return {hi_ >> shift, (hi_ << (64 - shift)) | (lo_ >> shift)}; + } + FMT_CONSTEXPR auto operator<<(int shift) const -> uint128_fallback { + if (shift == 64) return {lo_, 0}; + if (shift > 64) return uint128_fallback(lo_, 0) << (shift - 64); + return {hi_ << shift | (lo_ >> (64 - shift)), (lo_ << shift)}; + } + FMT_CONSTEXPR auto operator>>=(int shift) -> uint128_fallback& { + return *this = *this >> shift; + } + FMT_CONSTEXPR void operator+=(uint128_fallback n) { + uint64_t new_lo = lo_ + n.lo_; + uint64_t new_hi = hi_ + n.hi_ + (new_lo < lo_ ? 1 : 0); + FMT_ASSERT(new_hi >= hi_, ""); + lo_ = new_lo; + hi_ = new_hi; + } + FMT_CONSTEXPR void operator&=(uint128_fallback n) { + lo_ &= n.lo_; + hi_ &= n.hi_; + } + + FMT_CONSTEXPR20 auto operator+=(uint64_t n) noexcept -> uint128_fallback& { + if (is_constant_evaluated()) { + lo_ += n; + hi_ += (lo_ < n ? 1 : 0); + return *this; + } +#if FMT_HAS_BUILTIN(__builtin_addcll) && !defined(__ibmxl__) + unsigned long long carry; + lo_ = __builtin_addcll(lo_, n, 0, &carry); + hi_ += carry; +#elif FMT_HAS_BUILTIN(__builtin_ia32_addcarryx_u64) && !defined(__ibmxl__) + unsigned long long result; + auto carry = __builtin_ia32_addcarryx_u64(0, lo_, n, &result); + lo_ = result; + hi_ += carry; +#elif defined(_MSC_VER) && defined(_M_X64) + auto carry = _addcarry_u64(0, lo_, n, &lo_); + _addcarry_u64(carry, hi_, 0, &hi_); +#else + lo_ += n; + hi_ += (lo_ < n ? 1 : 0); +#endif + return *this; + } +}; + +using uint128_t = conditional_t; + +#ifdef UINTPTR_MAX +using uintptr_t = ::uintptr_t; +#else +using uintptr_t = uint128_t; +#endif + +// Returns the largest possible value for type T. Same as +// std::numeric_limits::max() but shorter and not affected by the max macro. +template constexpr auto max_value() -> T { + return (std::numeric_limits::max)(); +} +template constexpr auto num_bits() -> int { + return std::numeric_limits::digits; +} +// std::numeric_limits::digits may return 0 for 128-bit ints. +template <> constexpr auto num_bits() -> int { return 128; } +template <> constexpr auto num_bits() -> int { return 128; } + +// A heterogeneous bit_cast used for converting 96-bit long double to uint128_t +// and 128-bit pointers to uint128_fallback. +template sizeof(From))> +inline auto bit_cast(const From& from) -> To { + constexpr auto size = static_cast(sizeof(From) / sizeof(unsigned)); + struct data_t { + unsigned value[static_cast(size)]; + } data = bit_cast(from); + auto result = To(); + if (const_check(is_big_endian())) { + for (int i = 0; i < size; ++i) + result = (result << num_bits()) | data.value[i]; + } else { + for (int i = size - 1; i >= 0; --i) + result = (result << num_bits()) | data.value[i]; + } + return result; +} + +template +FMT_CONSTEXPR20 inline auto countl_zero_fallback(UInt n) -> int { + int lz = 0; + constexpr UInt msb_mask = static_cast(1) << (num_bits() - 1); + for (; (n & msb_mask) == 0; n <<= 1) lz++; + return lz; +} + +FMT_CONSTEXPR20 inline auto countl_zero(uint32_t n) -> int { +#ifdef FMT_BUILTIN_CLZ + if (!is_constant_evaluated()) return FMT_BUILTIN_CLZ(n); +#endif + return countl_zero_fallback(n); +} + +FMT_CONSTEXPR20 inline auto countl_zero(uint64_t n) -> int { +#ifdef FMT_BUILTIN_CLZLL + if (!is_constant_evaluated()) return FMT_BUILTIN_CLZLL(n); +#endif + return countl_zero_fallback(n); +} + +FMT_INLINE void assume(bool condition) { + (void)condition; +#if FMT_HAS_BUILTIN(__builtin_assume) && !FMT_ICC_VERSION + __builtin_assume(condition); +#elif FMT_GCC_VERSION + if (!condition) __builtin_unreachable(); +#endif +} + +// An approximation of iterator_t for pre-C++20 systems. +template +using iterator_t = decltype(std::begin(std::declval())); +template using sentinel_t = decltype(std::end(std::declval())); + +// A workaround for std::string not having mutable data() until C++17. +template +inline auto get_data(std::basic_string& s) -> Char* { + return &s[0]; +} +template +inline auto get_data(Container& c) -> typename Container::value_type* { + return c.data(); +} + +// Attempts to reserve space for n extra characters in the output range. +// Returns a pointer to the reserved range or a reference to it. +template ::value)> +#if FMT_CLANG_VERSION >= 307 && !FMT_ICC_VERSION +__attribute__((no_sanitize("undefined"))) +#endif +inline auto +reserve(std::back_insert_iterator it, size_t n) -> + typename Container::value_type* { + Container& c = get_container(it); + size_t size = c.size(); + c.resize(size + n); + return get_data(c) + size; +} + +template +inline auto reserve(buffer_appender it, size_t n) -> buffer_appender { + buffer& buf = get_container(it); + buf.try_reserve(buf.size() + n); + return it; +} + +template +constexpr auto reserve(Iterator& it, size_t) -> Iterator& { + return it; +} + +template +using reserve_iterator = + remove_reference_t(), 0))>; + +template +constexpr auto to_pointer(OutputIt, size_t) -> T* { + return nullptr; +} +template auto to_pointer(buffer_appender it, size_t n) -> T* { + buffer& buf = get_container(it); + auto size = buf.size(); + if (buf.capacity() < size + n) return nullptr; + buf.try_resize(size + n); + return buf.data() + size; +} + +template ::value)> +inline auto base_iterator(std::back_insert_iterator it, + typename Container::value_type*) + -> std::back_insert_iterator { + return it; +} + +template +constexpr auto base_iterator(Iterator, Iterator it) -> Iterator { + return it; +} + +// is spectacularly slow to compile in C++20 so use a simple fill_n +// instead (#1998). +template +FMT_CONSTEXPR auto fill_n(OutputIt out, Size count, const T& value) + -> OutputIt { + for (Size i = 0; i < count; ++i) *out++ = value; + return out; +} +template +FMT_CONSTEXPR20 auto fill_n(T* out, Size count, char value) -> T* { + if (is_constant_evaluated()) { + return fill_n(out, count, value); + } + std::memset(out, value, to_unsigned(count)); + return out + count; +} + +#ifdef __cpp_char8_t +using char8_type = char8_t; +#else +enum char8_type : unsigned char {}; +#endif + +template +FMT_CONSTEXPR FMT_NOINLINE auto copy_str_noinline(InputIt begin, InputIt end, + OutputIt out) -> OutputIt { + return copy_str(begin, end, out); +} + +// A public domain branchless UTF-8 decoder by Christopher Wellons: +// https://github.com/skeeto/branchless-utf8 +/* Decode the next character, c, from s, reporting errors in e. + * + * Since this is a branchless decoder, four bytes will be read from the + * buffer regardless of the actual length of the next character. This + * means the buffer _must_ have at least three bytes of zero padding + * following the end of the data stream. + * + * Errors are reported in e, which will be non-zero if the parsed + * character was somehow invalid: invalid byte sequence, non-canonical + * encoding, or a surrogate half. + * + * The function returns a pointer to the next character. When an error + * occurs, this pointer will be a guess that depends on the particular + * error, but it will always advance at least one byte. + */ +FMT_CONSTEXPR inline auto utf8_decode(const char* s, uint32_t* c, int* e) + -> const char* { + constexpr const int masks[] = {0x00, 0x7f, 0x1f, 0x0f, 0x07}; + constexpr const uint32_t mins[] = {4194304, 0, 128, 2048, 65536}; + constexpr const int shiftc[] = {0, 18, 12, 6, 0}; + constexpr const int shifte[] = {0, 6, 4, 2, 0}; + + int len = "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\0\0\0\0\0\0\0\0\2\2\2\2\3\3\4" + [static_cast(*s) >> 3]; + // Compute the pointer to the next character early so that the next + // iteration can start working on the next character. Neither Clang + // nor GCC figure out this reordering on their own. + const char* next = s + len + !len; + + using uchar = unsigned char; + + // Assume a four-byte character and load four bytes. Unused bits are + // shifted out. + *c = uint32_t(uchar(s[0]) & masks[len]) << 18; + *c |= uint32_t(uchar(s[1]) & 0x3f) << 12; + *c |= uint32_t(uchar(s[2]) & 0x3f) << 6; + *c |= uint32_t(uchar(s[3]) & 0x3f) << 0; + *c >>= shiftc[len]; + + // Accumulate the various error conditions. + *e = (*c < mins[len]) << 6; // non-canonical encoding + *e |= ((*c >> 11) == 0x1b) << 7; // surrogate half? + *e |= (*c > 0x10FFFF) << 8; // out of range? + *e |= (uchar(s[1]) & 0xc0) >> 2; + *e |= (uchar(s[2]) & 0xc0) >> 4; + *e |= uchar(s[3]) >> 6; + *e ^= 0x2a; // top two bits of each tail byte correct? + *e >>= shifte[len]; + + return next; +} + +constexpr FMT_INLINE_VARIABLE uint32_t invalid_code_point = ~uint32_t(); + +// Invokes f(cp, sv) for every code point cp in s with sv being the string view +// corresponding to the code point. cp is invalid_code_point on error. +template +FMT_CONSTEXPR void for_each_codepoint(string_view s, F f) { + auto decode = [f](const char* buf_ptr, const char* ptr) { + auto cp = uint32_t(); + auto error = 0; + auto end = utf8_decode(buf_ptr, &cp, &error); + bool result = f(error ? invalid_code_point : cp, + string_view(ptr, error ? 1 : to_unsigned(end - buf_ptr))); + return result ? (error ? buf_ptr + 1 : end) : nullptr; + }; + auto p = s.data(); + const size_t block_size = 4; // utf8_decode always reads blocks of 4 chars. + if (s.size() >= block_size) { + for (auto end = p + s.size() - block_size + 1; p < end;) { + p = decode(p, p); + if (!p) return; + } + } + if (auto num_chars_left = s.data() + s.size() - p) { + char buf[2 * block_size - 1] = {}; + copy_str(p, p + num_chars_left, buf); + const char* buf_ptr = buf; + do { + auto end = decode(buf_ptr, p); + if (!end) return; + p += end - buf_ptr; + buf_ptr = end; + } while (buf_ptr - buf < num_chars_left); + } +} + +template +inline auto compute_width(basic_string_view s) -> size_t { + return s.size(); +} + +// Computes approximate display width of a UTF-8 string. +FMT_CONSTEXPR inline auto compute_width(string_view s) -> size_t { + size_t num_code_points = 0; + // It is not a lambda for compatibility with C++14. + struct count_code_points { + size_t* count; + FMT_CONSTEXPR auto operator()(uint32_t cp, string_view) const -> bool { + *count += detail::to_unsigned( + 1 + + (cp >= 0x1100 && + (cp <= 0x115f || // Hangul Jamo init. consonants + cp == 0x2329 || // LEFT-POINTING ANGLE BRACKET + cp == 0x232a || // RIGHT-POINTING ANGLE BRACKET + // CJK ... Yi except IDEOGRAPHIC HALF FILL SPACE: + (cp >= 0x2e80 && cp <= 0xa4cf && cp != 0x303f) || + (cp >= 0xac00 && cp <= 0xd7a3) || // Hangul Syllables + (cp >= 0xf900 && cp <= 0xfaff) || // CJK Compatibility Ideographs + (cp >= 0xfe10 && cp <= 0xfe19) || // Vertical Forms + (cp >= 0xfe30 && cp <= 0xfe6f) || // CJK Compatibility Forms + (cp >= 0xff00 && cp <= 0xff60) || // Fullwidth Forms + (cp >= 0xffe0 && cp <= 0xffe6) || // Fullwidth Forms + (cp >= 0x20000 && cp <= 0x2fffd) || // CJK + (cp >= 0x30000 && cp <= 0x3fffd) || + // Miscellaneous Symbols and Pictographs + Emoticons: + (cp >= 0x1f300 && cp <= 0x1f64f) || + // Supplemental Symbols and Pictographs: + (cp >= 0x1f900 && cp <= 0x1f9ff)))); + return true; + } + }; + // We could avoid branches by using utf8_decode directly. + for_each_codepoint(s, count_code_points{&num_code_points}); + return num_code_points; +} + +inline auto compute_width(basic_string_view s) -> size_t { + return compute_width( + string_view(reinterpret_cast(s.data()), s.size())); +} + +template +inline auto code_point_index(basic_string_view s, size_t n) -> size_t { + size_t size = s.size(); + return n < size ? n : size; +} + +// Calculates the index of the nth code point in a UTF-8 string. +inline auto code_point_index(string_view s, size_t n) -> size_t { + size_t result = s.size(); + const char* begin = s.begin(); + for_each_codepoint(s, [begin, &n, &result](uint32_t, string_view sv) { + if (n != 0) { + --n; + return true; + } + result = to_unsigned(sv.begin() - begin); + return false; + }); + return result; +} + +inline auto code_point_index(basic_string_view s, size_t n) + -> size_t { + return code_point_index( + string_view(reinterpret_cast(s.data()), s.size()), n); +} + +template struct is_integral : std::is_integral {}; +template <> struct is_integral : std::true_type {}; +template <> struct is_integral : std::true_type {}; + +template +using is_signed = + std::integral_constant::is_signed || + std::is_same::value>; + +template +using is_integer = + bool_constant::value && !std::is_same::value && + !std::is_same::value && + !std::is_same::value>; + +#ifndef FMT_USE_FLOAT +# define FMT_USE_FLOAT 1 +#endif +#ifndef FMT_USE_DOUBLE +# define FMT_USE_DOUBLE 1 +#endif +#ifndef FMT_USE_LONG_DOUBLE +# define FMT_USE_LONG_DOUBLE 1 +#endif + +#ifndef FMT_USE_FLOAT128 +# ifdef __clang__ +// Clang emulates GCC, so it has to appear early. +# if FMT_HAS_INCLUDE() +# define FMT_USE_FLOAT128 1 +# endif +# elif defined(__GNUC__) +// GNU C++: +# if defined(_GLIBCXX_USE_FLOAT128) && !defined(__STRICT_ANSI__) +# define FMT_USE_FLOAT128 1 +# endif +# endif +# ifndef FMT_USE_FLOAT128 +# define FMT_USE_FLOAT128 0 +# endif +#endif + +#if FMT_USE_FLOAT128 +using float128 = __float128; +#else +using float128 = void; +#endif +template using is_float128 = std::is_same; + +template +using is_floating_point = + bool_constant::value || is_float128::value>; + +template ::value> +struct is_fast_float : bool_constant::is_iec559 && + sizeof(T) <= sizeof(double)> {}; +template struct is_fast_float : std::false_type {}; + +template +using is_double_double = bool_constant::digits == 106>; + +#ifndef FMT_USE_FULL_CACHE_DRAGONBOX +# define FMT_USE_FULL_CACHE_DRAGONBOX 0 +#endif + +template +template +void buffer::append(const U* begin, const U* end) { + while (begin != end) { + auto count = to_unsigned(end - begin); + try_reserve(size_ + count); + auto free_cap = capacity_ - size_; + if (free_cap < count) count = free_cap; + std::uninitialized_copy_n(begin, count, ptr_ + size_); + size_ += count; + begin += count; + } +} + +template +struct is_locale : std::false_type {}; +template +struct is_locale> : std::true_type {}; +} // namespace detail + +FMT_BEGIN_EXPORT + +// The number of characters to store in the basic_memory_buffer object itself +// to avoid dynamic memory allocation. +enum { inline_buffer_size = 500 }; + +/** + \rst + A dynamically growing memory buffer for trivially copyable/constructible types + with the first ``SIZE`` elements stored in the object itself. + + You can use the ``memory_buffer`` type alias for ``char`` instead. + + **Example**:: + + auto out = fmt::memory_buffer(); + fmt::format_to(std::back_inserter(out), "The answer is {}.", 42); + + This will append the following output to the ``out`` object: + + .. code-block:: none + + The answer is 42. + + The output can be converted to an ``std::string`` with ``to_string(out)``. + \endrst + */ +template > +class basic_memory_buffer final : public detail::buffer { + private: + T store_[SIZE]; + + // Don't inherit from Allocator to avoid generating type_info for it. + FMT_NO_UNIQUE_ADDRESS Allocator alloc_; + + // Deallocate memory allocated by the buffer. + FMT_CONSTEXPR20 void deallocate() { + T* data = this->data(); + if (data != store_) alloc_.deallocate(data, this->capacity()); + } + + protected: + FMT_CONSTEXPR20 void grow(size_t size) override { + detail::abort_fuzzing_if(size > 5000); + const size_t max_size = std::allocator_traits::max_size(alloc_); + size_t old_capacity = this->capacity(); + size_t new_capacity = old_capacity + old_capacity / 2; + if (size > new_capacity) + new_capacity = size; + else if (new_capacity > max_size) + new_capacity = size > max_size ? size : max_size; + T* old_data = this->data(); + T* new_data = + std::allocator_traits::allocate(alloc_, new_capacity); + // Suppress a bogus -Wstringop-overflow in gcc 13.1 (#3481). + detail::assume(this->size() <= new_capacity); + // The following code doesn't throw, so the raw pointer above doesn't leak. + std::uninitialized_copy_n(old_data, this->size(), new_data); + this->set(new_data, new_capacity); + // deallocate must not throw according to the standard, but even if it does, + // the buffer already uses the new storage and will deallocate it in + // destructor. + if (old_data != store_) alloc_.deallocate(old_data, old_capacity); + } + + public: + using value_type = T; + using const_reference = const T&; + + FMT_CONSTEXPR20 explicit basic_memory_buffer( + const Allocator& alloc = Allocator()) + : alloc_(alloc) { + this->set(store_, SIZE); + if (detail::is_constant_evaluated()) detail::fill_n(store_, SIZE, T()); + } + FMT_CONSTEXPR20 ~basic_memory_buffer() { deallocate(); } + + private: + // Move data from other to this buffer. + FMT_CONSTEXPR20 void move(basic_memory_buffer& other) { + alloc_ = std::move(other.alloc_); + T* data = other.data(); + size_t size = other.size(), capacity = other.capacity(); + if (data == other.store_) { + this->set(store_, capacity); + detail::copy_str(other.store_, other.store_ + size, store_); + } else { + this->set(data, capacity); + // Set pointer to the inline array so that delete is not called + // when deallocating. + other.set(other.store_, 0); + other.clear(); + } + this->resize(size); + } + + public: + /** + \rst + Constructs a :class:`fmt::basic_memory_buffer` object moving the content + of the other object to it. + \endrst + */ + FMT_CONSTEXPR20 basic_memory_buffer(basic_memory_buffer&& other) noexcept { + move(other); + } + + /** + \rst + Moves the content of the other ``basic_memory_buffer`` object to this one. + \endrst + */ + auto operator=(basic_memory_buffer&& other) noexcept -> basic_memory_buffer& { + FMT_ASSERT(this != &other, ""); + deallocate(); + move(other); + return *this; + } + + // Returns a copy of the allocator associated with this buffer. + auto get_allocator() const -> Allocator { return alloc_; } + + /** + Resizes the buffer to contain *count* elements. If T is a POD type new + elements may not be initialized. + */ + FMT_CONSTEXPR20 void resize(size_t count) { this->try_resize(count); } + + /** Increases the buffer capacity to *new_capacity*. */ + void reserve(size_t new_capacity) { this->try_reserve(new_capacity); } + + using detail::buffer::append; + template + void append(const ContiguousRange& range) { + append(range.data(), range.data() + range.size()); + } +}; + +using memory_buffer = basic_memory_buffer; + +template +struct is_contiguous> : std::true_type { +}; + +FMT_END_EXPORT +namespace detail { +FMT_API auto write_console(int fd, string_view text) -> bool; +FMT_API auto write_console(std::FILE* f, string_view text) -> bool; +FMT_API void print(std::FILE*, string_view); +} // namespace detail + +FMT_BEGIN_EXPORT + +// Suppress a misleading warning in older versions of clang. +#if FMT_CLANG_VERSION +# pragma clang diagnostic ignored "-Wweak-vtables" +#endif + +/** An error reported from a formatting function. */ +class FMT_SO_VISIBILITY("default") format_error : public std::runtime_error { + public: + using std::runtime_error::runtime_error; +}; + +namespace detail_exported { +#if FMT_USE_NONTYPE_TEMPLATE_ARGS +template struct fixed_string { + constexpr fixed_string(const Char (&str)[N]) { + detail::copy_str(static_cast(str), + str + N, data); + } + Char data[N] = {}; +}; +#endif + +// Converts a compile-time string to basic_string_view. +template +constexpr auto compile_string_to_view(const Char (&s)[N]) + -> basic_string_view { + // Remove trailing NUL character if needed. Won't be present if this is used + // with a raw character array (i.e. not defined as a string). + return {s, N - (std::char_traits::to_int_type(s[N - 1]) == 0 ? 1 : 0)}; +} +template +constexpr auto compile_string_to_view(detail::std_string_view s) + -> basic_string_view { + return {s.data(), s.size()}; +} +} // namespace detail_exported + +class loc_value { + private: + basic_format_arg value_; + + public: + template ::value)> + loc_value(T value) : value_(detail::make_arg(value)) {} + + template ::value)> + loc_value(T) {} + + template auto visit(Visitor&& vis) -> decltype(vis(0)) { + return visit_format_arg(vis, value_); + } +}; + +// A locale facet that formats values in UTF-8. +// It is parameterized on the locale to avoid the heavy include. +template class format_facet : public Locale::facet { + private: + std::string separator_; + std::string grouping_; + std::string decimal_point_; + + protected: + virtual auto do_put(appender out, loc_value val, + const format_specs<>& specs) const -> bool; + + public: + static FMT_API typename Locale::id id; + + explicit format_facet(Locale& loc); + explicit format_facet(string_view sep = "", + std::initializer_list g = {3}, + std::string decimal_point = ".") + : separator_(sep.data(), sep.size()), + grouping_(g.begin(), g.end()), + decimal_point_(decimal_point) {} + + auto put(appender out, loc_value val, const format_specs<>& specs) const + -> bool { + return do_put(out, val, specs); + } +}; + +namespace detail { + +// Returns true if value is negative, false otherwise. +// Same as `value < 0` but doesn't produce warnings if T is an unsigned type. +template ::value)> +constexpr auto is_negative(T value) -> bool { + return value < 0; +} +template ::value)> +constexpr auto is_negative(T) -> bool { + return false; +} + +template +FMT_CONSTEXPR auto is_supported_floating_point(T) -> bool { + if (std::is_same()) return FMT_USE_FLOAT; + if (std::is_same()) return FMT_USE_DOUBLE; + if (std::is_same()) return FMT_USE_LONG_DOUBLE; + return true; +} + +// Smallest of uint32_t, uint64_t, uint128_t that is large enough to +// represent all values of an integral type T. +template +using uint32_or_64_or_128_t = + conditional_t() <= 32 && !FMT_REDUCE_INT_INSTANTIATIONS, + uint32_t, + conditional_t() <= 64, uint64_t, uint128_t>>; +template +using uint64_or_128_t = conditional_t() <= 64, uint64_t, uint128_t>; + +#define FMT_POWERS_OF_10(factor) \ + factor * 10, (factor) * 100, (factor) * 1000, (factor) * 10000, \ + (factor) * 100000, (factor) * 1000000, (factor) * 10000000, \ + (factor) * 100000000, (factor) * 1000000000 + +// Converts value in the range [0, 100) to a string. +constexpr auto digits2(size_t value) -> const char* { + // GCC generates slightly better code when value is pointer-size. + return &"0001020304050607080910111213141516171819" + "2021222324252627282930313233343536373839" + "4041424344454647484950515253545556575859" + "6061626364656667686970717273747576777879" + "8081828384858687888990919293949596979899"[value * 2]; +} + +// Sign is a template parameter to workaround a bug in gcc 4.8. +template constexpr auto sign(Sign s) -> Char { +#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 604 + static_assert(std::is_same::value, ""); +#endif + return static_cast("\0-+ "[s]); +} + +template FMT_CONSTEXPR auto count_digits_fallback(T n) -> int { + int count = 1; + for (;;) { + // Integer division is slow so do it for a group of four digits instead + // of for every digit. The idea comes from the talk by Alexandrescu + // "Three Optimization Tips for C++". See speed-test for a comparison. + if (n < 10) return count; + if (n < 100) return count + 1; + if (n < 1000) return count + 2; + if (n < 10000) return count + 3; + n /= 10000u; + count += 4; + } +} +#if FMT_USE_INT128 +FMT_CONSTEXPR inline auto count_digits(uint128_opt n) -> int { + return count_digits_fallback(n); +} +#endif + +#ifdef FMT_BUILTIN_CLZLL +// It is a separate function rather than a part of count_digits to workaround +// the lack of static constexpr in constexpr functions. +inline auto do_count_digits(uint64_t n) -> int { + // This has comparable performance to the version by Kendall Willets + // (https://github.com/fmtlib/format-benchmark/blob/master/digits10) + // but uses smaller tables. + // Maps bsr(n) to ceil(log10(pow(2, bsr(n) + 1) - 1)). + static constexpr uint8_t bsr2log10[] = { + 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, + 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, + 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15, + 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 20}; + auto t = bsr2log10[FMT_BUILTIN_CLZLL(n | 1) ^ 63]; + static constexpr const uint64_t zero_or_powers_of_10[] = { + 0, 0, FMT_POWERS_OF_10(1U), FMT_POWERS_OF_10(1000000000ULL), + 10000000000000000000ULL}; + return t - (n < zero_or_powers_of_10[t]); +} +#endif + +// Returns the number of decimal digits in n. Leading zeros are not counted +// except for n == 0 in which case count_digits returns 1. +FMT_CONSTEXPR20 inline auto count_digits(uint64_t n) -> int { +#ifdef FMT_BUILTIN_CLZLL + if (!is_constant_evaluated()) { + return do_count_digits(n); + } +#endif + return count_digits_fallback(n); +} + +// Counts the number of digits in n. BITS = log2(radix). +template +FMT_CONSTEXPR auto count_digits(UInt n) -> int { +#ifdef FMT_BUILTIN_CLZ + if (!is_constant_evaluated() && num_bits() == 32) + return (FMT_BUILTIN_CLZ(static_cast(n) | 1) ^ 31) / BITS + 1; +#endif + // Lambda avoids unreachable code warnings from NVHPC. + return [](UInt m) { + int num_digits = 0; + do { + ++num_digits; + } while ((m >>= BITS) != 0); + return num_digits; + }(n); +} + +#ifdef FMT_BUILTIN_CLZ +// It is a separate function rather than a part of count_digits to workaround +// the lack of static constexpr in constexpr functions. +FMT_INLINE auto do_count_digits(uint32_t n) -> int { +// An optimization by Kendall Willets from https://bit.ly/3uOIQrB. +// This increments the upper 32 bits (log10(T) - 1) when >= T is added. +# define FMT_INC(T) (((sizeof(#T) - 1ull) << 32) - T) + static constexpr uint64_t table[] = { + FMT_INC(0), FMT_INC(0), FMT_INC(0), // 8 + FMT_INC(10), FMT_INC(10), FMT_INC(10), // 64 + FMT_INC(100), FMT_INC(100), FMT_INC(100), // 512 + FMT_INC(1000), FMT_INC(1000), FMT_INC(1000), // 4096 + FMT_INC(10000), FMT_INC(10000), FMT_INC(10000), // 32k + FMT_INC(100000), FMT_INC(100000), FMT_INC(100000), // 256k + FMT_INC(1000000), FMT_INC(1000000), FMT_INC(1000000), // 2048k + FMT_INC(10000000), FMT_INC(10000000), FMT_INC(10000000), // 16M + FMT_INC(100000000), FMT_INC(100000000), FMT_INC(100000000), // 128M + FMT_INC(1000000000), FMT_INC(1000000000), FMT_INC(1000000000), // 1024M + FMT_INC(1000000000), FMT_INC(1000000000) // 4B + }; + auto inc = table[FMT_BUILTIN_CLZ(n | 1) ^ 31]; + return static_cast((n + inc) >> 32); +} +#endif + +// Optional version of count_digits for better performance on 32-bit platforms. +FMT_CONSTEXPR20 inline auto count_digits(uint32_t n) -> int { +#ifdef FMT_BUILTIN_CLZ + if (!is_constant_evaluated()) { + return do_count_digits(n); + } +#endif + return count_digits_fallback(n); +} + +template constexpr auto digits10() noexcept -> int { + return std::numeric_limits::digits10; +} +template <> constexpr auto digits10() noexcept -> int { return 38; } +template <> constexpr auto digits10() noexcept -> int { return 38; } + +template struct thousands_sep_result { + std::string grouping; + Char thousands_sep; +}; + +template +FMT_API auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result; +template +inline auto thousands_sep(locale_ref loc) -> thousands_sep_result { + auto result = thousands_sep_impl(loc); + return {result.grouping, Char(result.thousands_sep)}; +} +template <> +inline auto thousands_sep(locale_ref loc) -> thousands_sep_result { + return thousands_sep_impl(loc); +} + +template +FMT_API auto decimal_point_impl(locale_ref loc) -> Char; +template inline auto decimal_point(locale_ref loc) -> Char { + return Char(decimal_point_impl(loc)); +} +template <> inline auto decimal_point(locale_ref loc) -> wchar_t { + return decimal_point_impl(loc); +} + +// Compares two characters for equality. +template auto equal2(const Char* lhs, const char* rhs) -> bool { + return lhs[0] == Char(rhs[0]) && lhs[1] == Char(rhs[1]); +} +inline auto equal2(const char* lhs, const char* rhs) -> bool { + return memcmp(lhs, rhs, 2) == 0; +} + +// Copies two characters from src to dst. +template +FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) { + if (!is_constant_evaluated() && sizeof(Char) == sizeof(char)) { + memcpy(dst, src, 2); + return; + } + *dst++ = static_cast(*src++); + *dst = static_cast(*src); +} + +template struct format_decimal_result { + Iterator begin; + Iterator end; +}; + +// Formats a decimal unsigned integer value writing into out pointing to a +// buffer of specified size. The caller must ensure that the buffer is large +// enough. +template +FMT_CONSTEXPR20 auto format_decimal(Char* out, UInt value, int size) + -> format_decimal_result { + FMT_ASSERT(size >= count_digits(value), "invalid digit count"); + out += size; + Char* end = out; + while (value >= 100) { + // Integer division is slow so do it for a group of two digits instead + // of for every digit. The idea comes from the talk by Alexandrescu + // "Three Optimization Tips for C++". See speed-test for a comparison. + out -= 2; + copy2(out, digits2(static_cast(value % 100))); + value /= 100; + } + if (value < 10) { + *--out = static_cast('0' + value); + return {out, end}; + } + out -= 2; + copy2(out, digits2(static_cast(value))); + return {out, end}; +} + +template >::value)> +FMT_CONSTEXPR inline auto format_decimal(Iterator out, UInt value, int size) + -> format_decimal_result { + // Buffer is large enough to hold all digits (digits10 + 1). + Char buffer[digits10() + 1] = {}; + auto end = format_decimal(buffer, value, size).end; + return {out, detail::copy_str_noinline(buffer, end, out)}; +} + +template +FMT_CONSTEXPR auto format_uint(Char* buffer, UInt value, int num_digits, + bool upper = false) -> Char* { + buffer += num_digits; + Char* end = buffer; + do { + const char* digits = upper ? "0123456789ABCDEF" : "0123456789abcdef"; + unsigned digit = static_cast(value & ((1 << BASE_BITS) - 1)); + *--buffer = static_cast(BASE_BITS < 4 ? static_cast('0' + digit) + : digits[digit]); + } while ((value >>= BASE_BITS) != 0); + return end; +} + +template +FMT_CONSTEXPR inline auto format_uint(It out, UInt value, int num_digits, + bool upper = false) -> It { + if (auto ptr = to_pointer(out, to_unsigned(num_digits))) { + format_uint(ptr, value, num_digits, upper); + return out; + } + // Buffer should be large enough to hold all digits (digits / BASE_BITS + 1). + char buffer[num_bits() / BASE_BITS + 1] = {}; + format_uint(buffer, value, num_digits, upper); + return detail::copy_str_noinline(buffer, buffer + num_digits, out); +} + +// A converter from UTF-8 to UTF-16. +class utf8_to_utf16 { + private: + basic_memory_buffer buffer_; + + public: + FMT_API explicit utf8_to_utf16(string_view s); + operator basic_string_view() const { return {&buffer_[0], size()}; } + auto size() const -> size_t { return buffer_.size() - 1; } + auto c_str() const -> const wchar_t* { return &buffer_[0]; } + auto str() const -> std::wstring { return {&buffer_[0], size()}; } +}; + +enum class to_utf8_error_policy { abort, replace }; + +// A converter from UTF-16/UTF-32 (host endian) to UTF-8. +template class to_utf8 { + private: + Buffer buffer_; + + public: + to_utf8() {} + explicit to_utf8(basic_string_view s, + to_utf8_error_policy policy = to_utf8_error_policy::abort) { + static_assert(sizeof(WChar) == 2 || sizeof(WChar) == 4, + "Expect utf16 or utf32"); + if (!convert(s, policy)) + FMT_THROW(std::runtime_error(sizeof(WChar) == 2 ? "invalid utf16" + : "invalid utf32")); + } + operator string_view() const { return string_view(&buffer_[0], size()); } + auto size() const -> size_t { return buffer_.size() - 1; } + auto c_str() const -> const char* { return &buffer_[0]; } + auto str() const -> std::string { return std::string(&buffer_[0], size()); } + + // Performs conversion returning a bool instead of throwing exception on + // conversion error. This method may still throw in case of memory allocation + // error. + auto convert(basic_string_view s, + to_utf8_error_policy policy = to_utf8_error_policy::abort) + -> bool { + if (!convert(buffer_, s, policy)) return false; + buffer_.push_back(0); + return true; + } + static auto convert(Buffer& buf, basic_string_view s, + to_utf8_error_policy policy = to_utf8_error_policy::abort) + -> bool { + for (auto p = s.begin(); p != s.end(); ++p) { + uint32_t c = static_cast(*p); + if (sizeof(WChar) == 2 && c >= 0xd800 && c <= 0xdfff) { + // Handle a surrogate pair. + ++p; + if (p == s.end() || (c & 0xfc00) != 0xd800 || (*p & 0xfc00) != 0xdc00) { + if (policy == to_utf8_error_policy::abort) return false; + buf.append(string_view("\xEF\xBF\xBD")); + --p; + } else { + c = (c << 10) + static_cast(*p) - 0x35fdc00; + } + } else if (c < 0x80) { + buf.push_back(static_cast(c)); + } else if (c < 0x800) { + buf.push_back(static_cast(0xc0 | (c >> 6))); + buf.push_back(static_cast(0x80 | (c & 0x3f))); + } else if ((c >= 0x800 && c <= 0xd7ff) || (c >= 0xe000 && c <= 0xffff)) { + buf.push_back(static_cast(0xe0 | (c >> 12))); + buf.push_back(static_cast(0x80 | ((c & 0xfff) >> 6))); + buf.push_back(static_cast(0x80 | (c & 0x3f))); + } else if (c >= 0x10000 && c <= 0x10ffff) { + buf.push_back(static_cast(0xf0 | (c >> 18))); + buf.push_back(static_cast(0x80 | ((c & 0x3ffff) >> 12))); + buf.push_back(static_cast(0x80 | ((c & 0xfff) >> 6))); + buf.push_back(static_cast(0x80 | (c & 0x3f))); + } else { + return false; + } + } + return true; + } +}; + +// Computes 128-bit result of multiplication of two 64-bit unsigned integers. +inline auto umul128(uint64_t x, uint64_t y) noexcept -> uint128_fallback { +#if FMT_USE_INT128 + auto p = static_cast(x) * static_cast(y); + return {static_cast(p >> 64), static_cast(p)}; +#elif defined(_MSC_VER) && defined(_M_X64) + auto hi = uint64_t(); + auto lo = _umul128(x, y, &hi); + return {hi, lo}; +#else + const uint64_t mask = static_cast(max_value()); + + uint64_t a = x >> 32; + uint64_t b = x & mask; + uint64_t c = y >> 32; + uint64_t d = y & mask; + + uint64_t ac = a * c; + uint64_t bc = b * c; + uint64_t ad = a * d; + uint64_t bd = b * d; + + uint64_t intermediate = (bd >> 32) + (ad & mask) + (bc & mask); + + return {ac + (intermediate >> 32) + (ad >> 32) + (bc >> 32), + (intermediate << 32) + (bd & mask)}; +#endif +} + +namespace dragonbox { +// Computes floor(log10(pow(2, e))) for e in [-2620, 2620] using the method from +// https://fmt.dev/papers/Dragonbox.pdf#page=28, section 6.1. +inline auto floor_log10_pow2(int e) noexcept -> int { + FMT_ASSERT(e <= 2620 && e >= -2620, "too large exponent"); + static_assert((-1 >> 1) == -1, "right shift is not arithmetic"); + return (e * 315653) >> 20; +} + +inline auto floor_log2_pow10(int e) noexcept -> int { + FMT_ASSERT(e <= 1233 && e >= -1233, "too large exponent"); + return (e * 1741647) >> 19; +} + +// Computes upper 64 bits of multiplication of two 64-bit unsigned integers. +inline auto umul128_upper64(uint64_t x, uint64_t y) noexcept -> uint64_t { +#if FMT_USE_INT128 + auto p = static_cast(x) * static_cast(y); + return static_cast(p >> 64); +#elif defined(_MSC_VER) && defined(_M_X64) + return __umulh(x, y); +#else + return umul128(x, y).high(); +#endif +} + +// Computes upper 128 bits of multiplication of a 64-bit unsigned integer and a +// 128-bit unsigned integer. +inline auto umul192_upper128(uint64_t x, uint128_fallback y) noexcept + -> uint128_fallback { + uint128_fallback r = umul128(x, y.high()); + r += umul128_upper64(x, y.low()); + return r; +} + +FMT_API auto get_cached_power(int k) noexcept -> uint128_fallback; + +// Type-specific information that Dragonbox uses. +template struct float_info; + +template <> struct float_info { + using carrier_uint = uint32_t; + static const int exponent_bits = 8; + static const int kappa = 1; + static const int big_divisor = 100; + static const int small_divisor = 10; + static const int min_k = -31; + static const int max_k = 46; + static const int shorter_interval_tie_lower_threshold = -35; + static const int shorter_interval_tie_upper_threshold = -35; +}; + +template <> struct float_info { + using carrier_uint = uint64_t; + static const int exponent_bits = 11; + static const int kappa = 2; + static const int big_divisor = 1000; + static const int small_divisor = 100; + static const int min_k = -292; + static const int max_k = 341; + static const int shorter_interval_tie_lower_threshold = -77; + static const int shorter_interval_tie_upper_threshold = -77; +}; + +// An 80- or 128-bit floating point number. +template +struct float_info::digits == 64 || + std::numeric_limits::digits == 113 || + is_float128::value>> { + using carrier_uint = detail::uint128_t; + static const int exponent_bits = 15; +}; + +// A double-double floating point number. +template +struct float_info::value>> { + using carrier_uint = detail::uint128_t; +}; + +template struct decimal_fp { + using significand_type = typename float_info::carrier_uint; + significand_type significand; + int exponent; +}; + +template FMT_API auto to_decimal(T x) noexcept -> decimal_fp; +} // namespace dragonbox + +// Returns true iff Float has the implicit bit which is not stored. +template constexpr auto has_implicit_bit() -> bool { + // An 80-bit FP number has a 64-bit significand an no implicit bit. + return std::numeric_limits::digits != 64; +} + +// Returns the number of significand bits stored in Float. The implicit bit is +// not counted since it is not stored. +template constexpr auto num_significand_bits() -> int { + // std::numeric_limits may not support __float128. + return is_float128() ? 112 + : (std::numeric_limits::digits - + (has_implicit_bit() ? 1 : 0)); +} + +template +constexpr auto exponent_mask() -> + typename dragonbox::float_info::carrier_uint { + using float_uint = typename dragonbox::float_info::carrier_uint; + return ((float_uint(1) << dragonbox::float_info::exponent_bits) - 1) + << num_significand_bits(); +} +template constexpr auto exponent_bias() -> int { + // std::numeric_limits may not support __float128. + return is_float128() ? 16383 + : std::numeric_limits::max_exponent - 1; +} + +// Writes the exponent exp in the form "[+-]d{2,3}" to buffer. +template +FMT_CONSTEXPR auto write_exponent(int exp, It it) -> It { + FMT_ASSERT(-10000 < exp && exp < 10000, "exponent out of range"); + if (exp < 0) { + *it++ = static_cast('-'); + exp = -exp; + } else { + *it++ = static_cast('+'); + } + if (exp >= 100) { + const char* top = digits2(to_unsigned(exp / 100)); + if (exp >= 1000) *it++ = static_cast(top[0]); + *it++ = static_cast(top[1]); + exp %= 100; + } + const char* d = digits2(to_unsigned(exp)); + *it++ = static_cast(d[0]); + *it++ = static_cast(d[1]); + return it; +} + +// A floating-point number f * pow(2, e) where F is an unsigned type. +template struct basic_fp { + F f; + int e; + + static constexpr const int num_significand_bits = + static_cast(sizeof(F) * num_bits()); + + constexpr basic_fp() : f(0), e(0) {} + constexpr basic_fp(uint64_t f_val, int e_val) : f(f_val), e(e_val) {} + + // Constructs fp from an IEEE754 floating-point number. + template FMT_CONSTEXPR basic_fp(Float n) { assign(n); } + + // Assigns n to this and return true iff predecessor is closer than successor. + template ::value)> + FMT_CONSTEXPR auto assign(Float n) -> bool { + static_assert(std::numeric_limits::digits <= 113, "unsupported FP"); + // Assume Float is in the format [sign][exponent][significand]. + using carrier_uint = typename dragonbox::float_info::carrier_uint; + const auto num_float_significand_bits = + detail::num_significand_bits(); + const auto implicit_bit = carrier_uint(1) << num_float_significand_bits; + const auto significand_mask = implicit_bit - 1; + auto u = bit_cast(n); + f = static_cast(u & significand_mask); + auto biased_e = static_cast((u & exponent_mask()) >> + num_float_significand_bits); + // The predecessor is closer if n is a normalized power of 2 (f == 0) + // other than the smallest normalized number (biased_e > 1). + auto is_predecessor_closer = f == 0 && biased_e > 1; + if (biased_e == 0) + biased_e = 1; // Subnormals use biased exponent 1 (min exponent). + else if (has_implicit_bit()) + f += static_cast(implicit_bit); + e = biased_e - exponent_bias() - num_float_significand_bits; + if (!has_implicit_bit()) ++e; + return is_predecessor_closer; + } + + template ::value)> + FMT_CONSTEXPR auto assign(Float n) -> bool { + static_assert(std::numeric_limits::is_iec559, "unsupported FP"); + return assign(static_cast(n)); + } +}; + +using fp = basic_fp; + +// Normalizes the value converted from double and multiplied by (1 << SHIFT). +template +FMT_CONSTEXPR auto normalize(basic_fp value) -> basic_fp { + // Handle subnormals. + const auto implicit_bit = F(1) << num_significand_bits(); + const auto shifted_implicit_bit = implicit_bit << SHIFT; + while ((value.f & shifted_implicit_bit) == 0) { + value.f <<= 1; + --value.e; + } + // Subtract 1 to account for hidden bit. + const auto offset = basic_fp::num_significand_bits - + num_significand_bits() - SHIFT - 1; + value.f <<= offset; + value.e -= offset; + return value; +} + +// Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking. +FMT_CONSTEXPR inline auto multiply(uint64_t lhs, uint64_t rhs) -> uint64_t { +#if FMT_USE_INT128 + auto product = static_cast<__uint128_t>(lhs) * rhs; + auto f = static_cast(product >> 64); + return (static_cast(product) & (1ULL << 63)) != 0 ? f + 1 : f; +#else + // Multiply 32-bit parts of significands. + uint64_t mask = (1ULL << 32) - 1; + uint64_t a = lhs >> 32, b = lhs & mask; + uint64_t c = rhs >> 32, d = rhs & mask; + uint64_t ac = a * c, bc = b * c, ad = a * d, bd = b * d; + // Compute mid 64-bit of result and round. + uint64_t mid = (bd >> 32) + (ad & mask) + (bc & mask) + (1U << 31); + return ac + (ad >> 32) + (bc >> 32) + (mid >> 32); +#endif +} + +FMT_CONSTEXPR inline auto operator*(fp x, fp y) -> fp { + return {multiply(x.f, y.f), x.e + y.e + 64}; +} + +template () == num_bits()> +using convert_float_result = + conditional_t::value || doublish, double, T>; + +template +constexpr auto convert_float(T value) -> convert_float_result { + return static_cast>(value); +} + +template +FMT_NOINLINE FMT_CONSTEXPR auto fill(OutputIt it, size_t n, + const fill_t& fill) -> OutputIt { + auto fill_size = fill.size(); + if (fill_size == 1) return detail::fill_n(it, n, fill[0]); + auto data = fill.data(); + for (size_t i = 0; i < n; ++i) + it = copy_str(data, data + fill_size, it); + return it; +} + +// Writes the output of f, padded according to format specifications in specs. +// size: output size in code units. +// width: output display width in (terminal) column positions. +template +FMT_CONSTEXPR auto write_padded(OutputIt out, const format_specs& specs, + size_t size, size_t width, F&& f) -> OutputIt { + static_assert(align == align::left || align == align::right, ""); + unsigned spec_width = to_unsigned(specs.width); + size_t padding = spec_width > width ? spec_width - width : 0; + // Shifts are encoded as string literals because static constexpr is not + // supported in constexpr functions. + auto* shifts = align == align::left ? "\x1f\x1f\x00\x01" : "\x00\x1f\x00\x01"; + size_t left_padding = padding >> shifts[specs.align]; + size_t right_padding = padding - left_padding; + auto it = reserve(out, size + padding * specs.fill.size()); + if (left_padding != 0) it = fill(it, left_padding, specs.fill); + it = f(it); + if (right_padding != 0) it = fill(it, right_padding, specs.fill); + return base_iterator(out, it); +} + +template +constexpr auto write_padded(OutputIt out, const format_specs& specs, + size_t size, F&& f) -> OutputIt { + return write_padded(out, specs, size, size, f); +} + +template +FMT_CONSTEXPR auto write_bytes(OutputIt out, string_view bytes, + const format_specs& specs) -> OutputIt { + return write_padded( + out, specs, bytes.size(), [bytes](reserve_iterator it) { + const char* data = bytes.data(); + return copy_str(data, data + bytes.size(), it); + }); +} + +template +auto write_ptr(OutputIt out, UIntPtr value, const format_specs* specs) + -> OutputIt { + int num_digits = count_digits<4>(value); + auto size = to_unsigned(num_digits) + size_t(2); + auto write = [=](reserve_iterator it) { + *it++ = static_cast('0'); + *it++ = static_cast('x'); + return format_uint<4, Char>(it, value, num_digits); + }; + return specs ? write_padded(out, *specs, size, write) + : base_iterator(out, write(reserve(out, size))); +} + +// Returns true iff the code point cp is printable. +FMT_API auto is_printable(uint32_t cp) -> bool; + +inline auto needs_escape(uint32_t cp) -> bool { + return cp < 0x20 || cp == 0x7f || cp == '"' || cp == '\\' || + !is_printable(cp); +} + +template struct find_escape_result { + const Char* begin; + const Char* end; + uint32_t cp; +}; + +template +using make_unsigned_char = + typename conditional_t::value, + std::make_unsigned, + type_identity>::type; + +template +auto find_escape(const Char* begin, const Char* end) + -> find_escape_result { + for (; begin != end; ++begin) { + uint32_t cp = static_cast>(*begin); + if (const_check(sizeof(Char) == 1) && cp >= 0x80) continue; + if (needs_escape(cp)) return {begin, begin + 1, cp}; + } + return {begin, nullptr, 0}; +} + +inline auto find_escape(const char* begin, const char* end) + -> find_escape_result { + if (!is_utf8()) return find_escape(begin, end); + auto result = find_escape_result{end, nullptr, 0}; + for_each_codepoint(string_view(begin, to_unsigned(end - begin)), + [&](uint32_t cp, string_view sv) { + if (needs_escape(cp)) { + result = {sv.begin(), sv.end(), cp}; + return false; + } + return true; + }); + return result; +} + +#define FMT_STRING_IMPL(s, base, explicit) \ + [] { \ + /* Use the hidden visibility as a workaround for a GCC bug (#1973). */ \ + /* Use a macro-like name to avoid shadowing warnings. */ \ + struct FMT_VISIBILITY("hidden") FMT_COMPILE_STRING : base { \ + using char_type FMT_MAYBE_UNUSED = fmt::remove_cvref_t; \ + FMT_MAYBE_UNUSED FMT_CONSTEXPR explicit \ + operator fmt::basic_string_view() const { \ + return fmt::detail_exported::compile_string_to_view(s); \ + } \ + }; \ + return FMT_COMPILE_STRING(); \ + }() + +/** + \rst + Constructs a compile-time format string from a string literal *s*. + + **Example**:: + + // A compile-time error because 'd' is an invalid specifier for strings. + std::string s = fmt::format(FMT_STRING("{:d}"), "foo"); + \endrst + */ +#define FMT_STRING(s) FMT_STRING_IMPL(s, fmt::detail::compile_string, ) + +template +auto write_codepoint(OutputIt out, char prefix, uint32_t cp) -> OutputIt { + *out++ = static_cast('\\'); + *out++ = static_cast(prefix); + Char buf[width]; + fill_n(buf, width, static_cast('0')); + format_uint<4>(buf, cp, width); + return copy_str(buf, buf + width, out); +} + +template +auto write_escaped_cp(OutputIt out, const find_escape_result& escape) + -> OutputIt { + auto c = static_cast(escape.cp); + switch (escape.cp) { + case '\n': + *out++ = static_cast('\\'); + c = static_cast('n'); + break; + case '\r': + *out++ = static_cast('\\'); + c = static_cast('r'); + break; + case '\t': + *out++ = static_cast('\\'); + c = static_cast('t'); + break; + case '"': + FMT_FALLTHROUGH; + case '\'': + FMT_FALLTHROUGH; + case '\\': + *out++ = static_cast('\\'); + break; + default: + if (escape.cp < 0x100) { + return write_codepoint<2, Char>(out, 'x', escape.cp); + } + if (escape.cp < 0x10000) { + return write_codepoint<4, Char>(out, 'u', escape.cp); + } + if (escape.cp < 0x110000) { + return write_codepoint<8, Char>(out, 'U', escape.cp); + } + for (Char escape_char : basic_string_view( + escape.begin, to_unsigned(escape.end - escape.begin))) { + out = write_codepoint<2, Char>(out, 'x', + static_cast(escape_char) & 0xFF); + } + return out; + } + *out++ = c; + return out; +} + +template +auto write_escaped_string(OutputIt out, basic_string_view str) + -> OutputIt { + *out++ = static_cast('"'); + auto begin = str.begin(), end = str.end(); + do { + auto escape = find_escape(begin, end); + out = copy_str(begin, escape.begin, out); + begin = escape.end; + if (!begin) break; + out = write_escaped_cp(out, escape); + } while (begin != end); + *out++ = static_cast('"'); + return out; +} + +template +auto write_escaped_char(OutputIt out, Char v) -> OutputIt { + Char v_array[1] = {v}; + *out++ = static_cast('\''); + if ((needs_escape(static_cast(v)) && v != static_cast('"')) || + v == static_cast('\'')) { + out = write_escaped_cp(out, + find_escape_result{v_array, v_array + 1, + static_cast(v)}); + } else { + *out++ = v; + } + *out++ = static_cast('\''); + return out; +} + +template +FMT_CONSTEXPR auto write_char(OutputIt out, Char value, + const format_specs& specs) -> OutputIt { + bool is_debug = specs.type == presentation_type::debug; + return write_padded(out, specs, 1, [=](reserve_iterator it) { + if (is_debug) return write_escaped_char(it, value); + *it++ = value; + return it; + }); +} +template +FMT_CONSTEXPR auto write(OutputIt out, Char value, + const format_specs& specs, locale_ref loc = {}) + -> OutputIt { + // char is formatted as unsigned char for consistency across platforms. + using unsigned_type = + conditional_t::value, unsigned char, unsigned>; + return check_char_specs(specs) + ? write_char(out, value, specs) + : write(out, static_cast(value), specs, loc); +} + +// Data for write_int that doesn't depend on output iterator type. It is used to +// avoid template code bloat. +template struct write_int_data { + size_t size; + size_t padding; + + FMT_CONSTEXPR write_int_data(int num_digits, unsigned prefix, + const format_specs& specs) + : size((prefix >> 24) + to_unsigned(num_digits)), padding(0) { + if (specs.align == align::numeric) { + auto width = to_unsigned(specs.width); + if (width > size) { + padding = width - size; + size = width; + } + } else if (specs.precision > num_digits) { + size = (prefix >> 24) + to_unsigned(specs.precision); + padding = to_unsigned(specs.precision - num_digits); + } + } +}; + +// Writes an integer in the format +// +// where are written by write_digits(it). +// prefix contains chars in three lower bytes and the size in the fourth byte. +template +FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, int num_digits, + unsigned prefix, + const format_specs& specs, + W write_digits) -> OutputIt { + // Slightly faster check for specs.width == 0 && specs.precision == -1. + if ((specs.width | (specs.precision + 1)) == 0) { + auto it = reserve(out, to_unsigned(num_digits) + (prefix >> 24)); + if (prefix != 0) { + for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8) + *it++ = static_cast(p & 0xff); + } + return base_iterator(out, write_digits(it)); + } + auto data = write_int_data(num_digits, prefix, specs); + return write_padded( + out, specs, data.size, [=](reserve_iterator it) { + for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8) + *it++ = static_cast(p & 0xff); + it = detail::fill_n(it, data.padding, static_cast('0')); + return write_digits(it); + }); +} + +template class digit_grouping { + private: + std::string grouping_; + std::basic_string thousands_sep_; + + struct next_state { + std::string::const_iterator group; + int pos; + }; + auto initial_state() const -> next_state { return {grouping_.begin(), 0}; } + + // Returns the next digit group separator position. + auto next(next_state& state) const -> int { + if (thousands_sep_.empty()) return max_value(); + if (state.group == grouping_.end()) return state.pos += grouping_.back(); + if (*state.group <= 0 || *state.group == max_value()) + return max_value(); + state.pos += *state.group++; + return state.pos; + } + + public: + explicit digit_grouping(locale_ref loc, bool localized = true) { + if (!localized) return; + auto sep = thousands_sep(loc); + grouping_ = sep.grouping; + if (sep.thousands_sep) thousands_sep_.assign(1, sep.thousands_sep); + } + digit_grouping(std::string grouping, std::basic_string sep) + : grouping_(std::move(grouping)), thousands_sep_(std::move(sep)) {} + + auto has_separator() const -> bool { return !thousands_sep_.empty(); } + + auto count_separators(int num_digits) const -> int { + int count = 0; + auto state = initial_state(); + while (num_digits > next(state)) ++count; + return count; + } + + // Applies grouping to digits and write the output to out. + template + auto apply(Out out, basic_string_view digits) const -> Out { + auto num_digits = static_cast(digits.size()); + auto separators = basic_memory_buffer(); + separators.push_back(0); + auto state = initial_state(); + while (int i = next(state)) { + if (i >= num_digits) break; + separators.push_back(i); + } + for (int i = 0, sep_index = static_cast(separators.size() - 1); + i < num_digits; ++i) { + if (num_digits - i == separators[sep_index]) { + out = + copy_str(thousands_sep_.data(), + thousands_sep_.data() + thousands_sep_.size(), out); + --sep_index; + } + *out++ = static_cast(digits[to_unsigned(i)]); + } + return out; + } +}; + +FMT_CONSTEXPR inline void prefix_append(unsigned& prefix, unsigned value) { + prefix |= prefix != 0 ? value << 8 : value; + prefix += (1u + (value > 0xff ? 1 : 0)) << 24; +} + +// Writes a decimal integer with digit grouping. +template +auto write_int(OutputIt out, UInt value, unsigned prefix, + const format_specs& specs, + const digit_grouping& grouping) -> OutputIt { + static_assert(std::is_same, UInt>::value, ""); + int num_digits = 0; + auto buffer = memory_buffer(); + switch (specs.type) { + case presentation_type::none: + case presentation_type::dec: { + num_digits = count_digits(value); + format_decimal(appender(buffer), value, num_digits); + break; + } + case presentation_type::hex_lower: + case presentation_type::hex_upper: { + bool upper = specs.type == presentation_type::hex_upper; + if (specs.alt) + prefix_append(prefix, unsigned(upper ? 'X' : 'x') << 8 | '0'); + num_digits = count_digits<4>(value); + format_uint<4, char>(appender(buffer), value, num_digits, upper); + break; + } + case presentation_type::bin_lower: + case presentation_type::bin_upper: { + bool upper = specs.type == presentation_type::bin_upper; + if (specs.alt) + prefix_append(prefix, unsigned(upper ? 'B' : 'b') << 8 | '0'); + num_digits = count_digits<1>(value); + format_uint<1, char>(appender(buffer), value, num_digits); + break; + } + case presentation_type::oct: { + num_digits = count_digits<3>(value); + // Octal prefix '0' is counted as a digit, so only add it if precision + // is not greater than the number of digits. + if (specs.alt && specs.precision <= num_digits && value != 0) + prefix_append(prefix, '0'); + format_uint<3, char>(appender(buffer), value, num_digits); + break; + } + case presentation_type::chr: + return write_char(out, static_cast(value), specs); + default: + throw_format_error("invalid format specifier"); + } + + unsigned size = (prefix != 0 ? prefix >> 24 : 0) + to_unsigned(num_digits) + + to_unsigned(grouping.count_separators(num_digits)); + return write_padded( + out, specs, size, size, [&](reserve_iterator it) { + for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8) + *it++ = static_cast(p & 0xff); + return grouping.apply(it, string_view(buffer.data(), buffer.size())); + }); +} + +// Writes a localized value. +FMT_API auto write_loc(appender out, loc_value value, + const format_specs<>& specs, locale_ref loc) -> bool; +template +inline auto write_loc(OutputIt, loc_value, const format_specs&, + locale_ref) -> bool { + return false; +} + +template struct write_int_arg { + UInt abs_value; + unsigned prefix; +}; + +template +FMT_CONSTEXPR auto make_write_int_arg(T value, sign_t sign) + -> write_int_arg> { + auto prefix = 0u; + auto abs_value = static_cast>(value); + if (is_negative(value)) { + prefix = 0x01000000 | '-'; + abs_value = 0 - abs_value; + } else { + constexpr const unsigned prefixes[4] = {0, 0, 0x1000000u | '+', + 0x1000000u | ' '}; + prefix = prefixes[sign]; + } + return {abs_value, prefix}; +} + +template struct loc_writer { + buffer_appender out; + const format_specs& specs; + std::basic_string sep; + std::string grouping; + std::basic_string decimal_point; + + template ::value)> + auto operator()(T value) -> bool { + auto arg = make_write_int_arg(value, specs.sign); + write_int(out, static_cast>(arg.abs_value), arg.prefix, + specs, digit_grouping(grouping, sep)); + return true; + } + + template ::value)> + auto operator()(T) -> bool { + return false; + } +}; + +template +FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, write_int_arg arg, + const format_specs& specs, + locale_ref) -> OutputIt { + static_assert(std::is_same>::value, ""); + auto abs_value = arg.abs_value; + auto prefix = arg.prefix; + switch (specs.type) { + case presentation_type::none: + case presentation_type::dec: { + auto num_digits = count_digits(abs_value); + return write_int( + out, num_digits, prefix, specs, [=](reserve_iterator it) { + return format_decimal(it, abs_value, num_digits).end; + }); + } + case presentation_type::hex_lower: + case presentation_type::hex_upper: { + bool upper = specs.type == presentation_type::hex_upper; + if (specs.alt) + prefix_append(prefix, unsigned(upper ? 'X' : 'x') << 8 | '0'); + int num_digits = count_digits<4>(abs_value); + return write_int( + out, num_digits, prefix, specs, [=](reserve_iterator it) { + return format_uint<4, Char>(it, abs_value, num_digits, upper); + }); + } + case presentation_type::bin_lower: + case presentation_type::bin_upper: { + bool upper = specs.type == presentation_type::bin_upper; + if (specs.alt) + prefix_append(prefix, unsigned(upper ? 'B' : 'b') << 8 | '0'); + int num_digits = count_digits<1>(abs_value); + return write_int(out, num_digits, prefix, specs, + [=](reserve_iterator it) { + return format_uint<1, Char>(it, abs_value, num_digits); + }); + } + case presentation_type::oct: { + int num_digits = count_digits<3>(abs_value); + // Octal prefix '0' is counted as a digit, so only add it if precision + // is not greater than the number of digits. + if (specs.alt && specs.precision <= num_digits && abs_value != 0) + prefix_append(prefix, '0'); + return write_int(out, num_digits, prefix, specs, + [=](reserve_iterator it) { + return format_uint<3, Char>(it, abs_value, num_digits); + }); + } + case presentation_type::chr: + return write_char(out, static_cast(abs_value), specs); + default: + throw_format_error("invalid format specifier"); + } + return out; +} +template +FMT_CONSTEXPR FMT_NOINLINE auto write_int_noinline( + OutputIt out, write_int_arg arg, const format_specs& specs, + locale_ref loc) -> OutputIt { + return write_int(out, arg, specs, loc); +} +template ::value && + !std::is_same::value && + std::is_same>::value)> +FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value, + const format_specs& specs, + locale_ref loc) -> OutputIt { + if (specs.localized && write_loc(out, value, specs, loc)) return out; + return write_int_noinline(out, make_write_int_arg(value, specs.sign), specs, + loc); +} +// An inlined version of write used in format string compilation. +template ::value && + !std::is_same::value && + !std::is_same>::value)> +FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value, + const format_specs& specs, + locale_ref loc) -> OutputIt { + if (specs.localized && write_loc(out, value, specs, loc)) return out; + return write_int(out, make_write_int_arg(value, specs.sign), specs, loc); +} + +// An output iterator that counts the number of objects written to it and +// discards them. +class counting_iterator { + private: + size_t count_; + + public: + using iterator_category = std::output_iterator_tag; + using difference_type = std::ptrdiff_t; + using pointer = void; + using reference = void; + FMT_UNCHECKED_ITERATOR(counting_iterator); + + struct value_type { + template FMT_CONSTEXPR void operator=(const T&) {} + }; + + FMT_CONSTEXPR counting_iterator() : count_(0) {} + + FMT_CONSTEXPR auto count() const -> size_t { return count_; } + + FMT_CONSTEXPR auto operator++() -> counting_iterator& { + ++count_; + return *this; + } + FMT_CONSTEXPR auto operator++(int) -> counting_iterator { + auto it = *this; + ++*this; + return it; + } + + FMT_CONSTEXPR friend auto operator+(counting_iterator it, difference_type n) + -> counting_iterator { + it.count_ += static_cast(n); + return it; + } + + FMT_CONSTEXPR auto operator*() const -> value_type { return {}; } +}; + +template +FMT_CONSTEXPR auto write(OutputIt out, basic_string_view s, + const format_specs& specs) -> OutputIt { + auto data = s.data(); + auto size = s.size(); + if (specs.precision >= 0 && to_unsigned(specs.precision) < size) + size = code_point_index(s, to_unsigned(specs.precision)); + bool is_debug = specs.type == presentation_type::debug; + size_t width = 0; + if (specs.width != 0) { + if (is_debug) + width = write_escaped_string(counting_iterator{}, s).count(); + else + width = compute_width(basic_string_view(data, size)); + } + return write_padded(out, specs, size, width, + [=](reserve_iterator it) { + if (is_debug) return write_escaped_string(it, s); + return copy_str(data, data + size, it); + }); +} +template +FMT_CONSTEXPR auto write(OutputIt out, + basic_string_view> s, + const format_specs& specs, locale_ref) + -> OutputIt { + return write(out, s, specs); +} +template +FMT_CONSTEXPR auto write(OutputIt out, const Char* s, + const format_specs& specs, locale_ref) + -> OutputIt { + if (specs.type == presentation_type::pointer) + return write_ptr(out, bit_cast(s), &specs); + if (!s) throw_format_error("string pointer is null"); + return write(out, basic_string_view(s), specs, {}); +} + +template ::value && + !std::is_same::value && + !std::is_same::value)> +FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt { + auto abs_value = static_cast>(value); + bool negative = is_negative(value); + // Don't do -abs_value since it trips unsigned-integer-overflow sanitizer. + if (negative) abs_value = ~abs_value + 1; + int num_digits = count_digits(abs_value); + auto size = (negative ? 1 : 0) + static_cast(num_digits); + auto it = reserve(out, size); + if (auto ptr = to_pointer(it, size)) { + if (negative) *ptr++ = static_cast('-'); + format_decimal(ptr, abs_value, num_digits); + return out; + } + if (negative) *it++ = static_cast('-'); + it = format_decimal(it, abs_value, num_digits).end; + return base_iterator(out, it); +} + +// DEPRECATED! +template +FMT_CONSTEXPR auto parse_align(const Char* begin, const Char* end, + format_specs& specs) -> const Char* { + FMT_ASSERT(begin != end, ""); + auto align = align::none; + auto p = begin + code_point_length(begin); + if (end - p <= 0) p = begin; + for (;;) { + switch (to_ascii(*p)) { + case '<': + align = align::left; + break; + case '>': + align = align::right; + break; + case '^': + align = align::center; + break; + } + if (align != align::none) { + if (p != begin) { + auto c = *begin; + if (c == '}') return begin; + if (c == '{') { + throw_format_error("invalid fill character '{'"); + return begin; + } + specs.fill = {begin, to_unsigned(p - begin)}; + begin = p + 1; + } else { + ++begin; + } + break; + } else if (p == begin) { + break; + } + p = begin; + } + specs.align = align; + return begin; +} + +// A floating-point presentation format. +enum class float_format : unsigned char { + general, // General: exponent notation or fixed point based on magnitude. + exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3. + fixed, // Fixed point with the default precision of 6, e.g. 0.0012. + hex +}; + +struct float_specs { + int precision; + float_format format : 8; + sign_t sign : 8; + bool upper : 1; + bool locale : 1; + bool binary32 : 1; + bool showpoint : 1; +}; + +template +FMT_CONSTEXPR auto parse_float_type_spec(const format_specs& specs) + -> float_specs { + auto result = float_specs(); + result.showpoint = specs.alt; + result.locale = specs.localized; + switch (specs.type) { + case presentation_type::none: + result.format = float_format::general; + break; + case presentation_type::general_upper: + result.upper = true; + FMT_FALLTHROUGH; + case presentation_type::general_lower: + result.format = float_format::general; + break; + case presentation_type::exp_upper: + result.upper = true; + FMT_FALLTHROUGH; + case presentation_type::exp_lower: + result.format = float_format::exp; + result.showpoint |= specs.precision != 0; + break; + case presentation_type::fixed_upper: + result.upper = true; + FMT_FALLTHROUGH; + case presentation_type::fixed_lower: + result.format = float_format::fixed; + result.showpoint |= specs.precision != 0; + break; + case presentation_type::hexfloat_upper: + result.upper = true; + FMT_FALLTHROUGH; + case presentation_type::hexfloat_lower: + result.format = float_format::hex; + break; + default: + throw_format_error("invalid format specifier"); + break; + } + return result; +} + +template +FMT_CONSTEXPR20 auto write_nonfinite(OutputIt out, bool isnan, + format_specs specs, + const float_specs& fspecs) -> OutputIt { + auto str = + isnan ? (fspecs.upper ? "NAN" : "nan") : (fspecs.upper ? "INF" : "inf"); + constexpr size_t str_size = 3; + auto sign = fspecs.sign; + auto size = str_size + (sign ? 1 : 0); + // Replace '0'-padding with space for non-finite values. + const bool is_zero_fill = + specs.fill.size() == 1 && *specs.fill.data() == static_cast('0'); + if (is_zero_fill) specs.fill[0] = static_cast(' '); + return write_padded(out, specs, size, [=](reserve_iterator it) { + if (sign) *it++ = detail::sign(sign); + return copy_str(str, str + str_size, it); + }); +} + +// A decimal floating-point number significand * pow(10, exp). +struct big_decimal_fp { + const char* significand; + int significand_size; + int exponent; +}; + +constexpr auto get_significand_size(const big_decimal_fp& f) -> int { + return f.significand_size; +} +template +inline auto get_significand_size(const dragonbox::decimal_fp& f) -> int { + return count_digits(f.significand); +} + +template +constexpr auto write_significand(OutputIt out, const char* significand, + int significand_size) -> OutputIt { + return copy_str(significand, significand + significand_size, out); +} +template +inline auto write_significand(OutputIt out, UInt significand, + int significand_size) -> OutputIt { + return format_decimal(out, significand, significand_size).end; +} +template +FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand, + int significand_size, int exponent, + const Grouping& grouping) -> OutputIt { + if (!grouping.has_separator()) { + out = write_significand(out, significand, significand_size); + return detail::fill_n(out, exponent, static_cast('0')); + } + auto buffer = memory_buffer(); + write_significand(appender(buffer), significand, significand_size); + detail::fill_n(appender(buffer), exponent, '0'); + return grouping.apply(out, string_view(buffer.data(), buffer.size())); +} + +template ::value)> +inline auto write_significand(Char* out, UInt significand, int significand_size, + int integral_size, Char decimal_point) -> Char* { + if (!decimal_point) + return format_decimal(out, significand, significand_size).end; + out += significand_size + 1; + Char* end = out; + int floating_size = significand_size - integral_size; + for (int i = floating_size / 2; i > 0; --i) { + out -= 2; + copy2(out, digits2(static_cast(significand % 100))); + significand /= 100; + } + if (floating_size % 2 != 0) { + *--out = static_cast('0' + significand % 10); + significand /= 10; + } + *--out = decimal_point; + format_decimal(out - integral_size, significand, integral_size); + return end; +} + +template >::value)> +inline auto write_significand(OutputIt out, UInt significand, + int significand_size, int integral_size, + Char decimal_point) -> OutputIt { + // Buffer is large enough to hold digits (digits10 + 1) and a decimal point. + Char buffer[digits10() + 2]; + auto end = write_significand(buffer, significand, significand_size, + integral_size, decimal_point); + return detail::copy_str_noinline(buffer, end, out); +} + +template +FMT_CONSTEXPR auto write_significand(OutputIt out, const char* significand, + int significand_size, int integral_size, + Char decimal_point) -> OutputIt { + out = detail::copy_str_noinline(significand, + significand + integral_size, out); + if (!decimal_point) return out; + *out++ = decimal_point; + return detail::copy_str_noinline(significand + integral_size, + significand + significand_size, out); +} + +template +FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand, + int significand_size, int integral_size, + Char decimal_point, + const Grouping& grouping) -> OutputIt { + if (!grouping.has_separator()) { + return write_significand(out, significand, significand_size, integral_size, + decimal_point); + } + auto buffer = basic_memory_buffer(); + write_significand(buffer_appender(buffer), significand, + significand_size, integral_size, decimal_point); + grouping.apply( + out, basic_string_view(buffer.data(), to_unsigned(integral_size))); + return detail::copy_str_noinline(buffer.data() + integral_size, + buffer.end(), out); +} + +template > +FMT_CONSTEXPR20 auto do_write_float(OutputIt out, const DecimalFP& f, + const format_specs& specs, + float_specs fspecs, locale_ref loc) + -> OutputIt { + auto significand = f.significand; + int significand_size = get_significand_size(f); + const Char zero = static_cast('0'); + auto sign = fspecs.sign; + size_t size = to_unsigned(significand_size) + (sign ? 1 : 0); + using iterator = reserve_iterator; + + Char decimal_point = + fspecs.locale ? detail::decimal_point(loc) : static_cast('.'); + + int output_exp = f.exponent + significand_size - 1; + auto use_exp_format = [=]() { + if (fspecs.format == float_format::exp) return true; + if (fspecs.format != float_format::general) return false; + // Use the fixed notation if the exponent is in [exp_lower, exp_upper), + // e.g. 0.0001 instead of 1e-04. Otherwise use the exponent notation. + const int exp_lower = -4, exp_upper = 16; + return output_exp < exp_lower || + output_exp >= (fspecs.precision > 0 ? fspecs.precision : exp_upper); + }; + if (use_exp_format()) { + int num_zeros = 0; + if (fspecs.showpoint) { + num_zeros = fspecs.precision - significand_size; + if (num_zeros < 0) num_zeros = 0; + size += to_unsigned(num_zeros); + } else if (significand_size == 1) { + decimal_point = Char(); + } + auto abs_output_exp = output_exp >= 0 ? output_exp : -output_exp; + int exp_digits = 2; + if (abs_output_exp >= 100) exp_digits = abs_output_exp >= 1000 ? 4 : 3; + + size += to_unsigned((decimal_point ? 1 : 0) + 2 + exp_digits); + char exp_char = fspecs.upper ? 'E' : 'e'; + auto write = [=](iterator it) { + if (sign) *it++ = detail::sign(sign); + // Insert a decimal point after the first digit and add an exponent. + it = write_significand(it, significand, significand_size, 1, + decimal_point); + if (num_zeros > 0) it = detail::fill_n(it, num_zeros, zero); + *it++ = static_cast(exp_char); + return write_exponent(output_exp, it); + }; + return specs.width > 0 ? write_padded(out, specs, size, write) + : base_iterator(out, write(reserve(out, size))); + } + + int exp = f.exponent + significand_size; + if (f.exponent >= 0) { + // 1234e5 -> 123400000[.0+] + size += to_unsigned(f.exponent); + int num_zeros = fspecs.precision - exp; + abort_fuzzing_if(num_zeros > 5000); + if (fspecs.showpoint) { + ++size; + if (num_zeros <= 0 && fspecs.format != float_format::fixed) num_zeros = 0; + if (num_zeros > 0) size += to_unsigned(num_zeros); + } + auto grouping = Grouping(loc, fspecs.locale); + size += to_unsigned(grouping.count_separators(exp)); + return write_padded(out, specs, size, [&](iterator it) { + if (sign) *it++ = detail::sign(sign); + it = write_significand(it, significand, significand_size, + f.exponent, grouping); + if (!fspecs.showpoint) return it; + *it++ = decimal_point; + return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it; + }); + } else if (exp > 0) { + // 1234e-2 -> 12.34[0+] + int num_zeros = fspecs.showpoint ? fspecs.precision - significand_size : 0; + size += 1 + to_unsigned(num_zeros > 0 ? num_zeros : 0); + auto grouping = Grouping(loc, fspecs.locale); + size += to_unsigned(grouping.count_separators(exp)); + return write_padded(out, specs, size, [&](iterator it) { + if (sign) *it++ = detail::sign(sign); + it = write_significand(it, significand, significand_size, exp, + decimal_point, grouping); + return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it; + }); + } + // 1234e-6 -> 0.001234 + int num_zeros = -exp; + if (significand_size == 0 && fspecs.precision >= 0 && + fspecs.precision < num_zeros) { + num_zeros = fspecs.precision; + } + bool pointy = num_zeros != 0 || significand_size != 0 || fspecs.showpoint; + size += 1 + (pointy ? 1 : 0) + to_unsigned(num_zeros); + return write_padded(out, specs, size, [&](iterator it) { + if (sign) *it++ = detail::sign(sign); + *it++ = zero; + if (!pointy) return it; + *it++ = decimal_point; + it = detail::fill_n(it, num_zeros, zero); + return write_significand(it, significand, significand_size); + }); +} + +template class fallback_digit_grouping { + public: + constexpr fallback_digit_grouping(locale_ref, bool) {} + + constexpr auto has_separator() const -> bool { return false; } + + constexpr auto count_separators(int) const -> int { return 0; } + + template + constexpr auto apply(Out out, basic_string_view) const -> Out { + return out; + } +}; + +template +FMT_CONSTEXPR20 auto write_float(OutputIt out, const DecimalFP& f, + const format_specs& specs, + float_specs fspecs, locale_ref loc) + -> OutputIt { + if (is_constant_evaluated()) { + return do_write_float>(out, f, specs, fspecs, + loc); + } else { + return do_write_float(out, f, specs, fspecs, loc); + } +} + +template constexpr auto isnan(T value) -> bool { + return !(value >= value); // std::isnan doesn't support __float128. +} + +template +struct has_isfinite : std::false_type {}; + +template +struct has_isfinite> + : std::true_type {}; + +template ::value&& + has_isfinite::value)> +FMT_CONSTEXPR20 auto isfinite(T value) -> bool { + constexpr T inf = T(std::numeric_limits::infinity()); + if (is_constant_evaluated()) + return !detail::isnan(value) && value < inf && value > -inf; + return std::isfinite(value); +} +template ::value)> +FMT_CONSTEXPR auto isfinite(T value) -> bool { + T inf = T(std::numeric_limits::infinity()); + // std::isfinite doesn't support __float128. + return !detail::isnan(value) && value < inf && value > -inf; +} + +template ::value)> +FMT_INLINE FMT_CONSTEXPR bool signbit(T value) { + if (is_constant_evaluated()) { +#ifdef __cpp_if_constexpr + if constexpr (std::numeric_limits::is_iec559) { + auto bits = detail::bit_cast(static_cast(value)); + return (bits >> (num_bits() - 1)) != 0; + } +#endif + } + return std::signbit(static_cast(value)); +} + +inline FMT_CONSTEXPR20 void adjust_precision(int& precision, int exp10) { + // Adjust fixed precision by exponent because it is relative to decimal + // point. + if (exp10 > 0 && precision > max_value() - exp10) + FMT_THROW(format_error("number is too big")); + precision += exp10; +} + +class bigint { + private: + // A bigint is stored as an array of bigits (big digits), with bigit at index + // 0 being the least significant one. + using bigit = uint32_t; + using double_bigit = uint64_t; + enum { bigits_capacity = 32 }; + basic_memory_buffer bigits_; + int exp_; + + FMT_CONSTEXPR20 auto operator[](int index) const -> bigit { + return bigits_[to_unsigned(index)]; + } + FMT_CONSTEXPR20 auto operator[](int index) -> bigit& { + return bigits_[to_unsigned(index)]; + } + + static constexpr const int bigit_bits = num_bits(); + + friend struct formatter; + + FMT_CONSTEXPR20 void subtract_bigits(int index, bigit other, bigit& borrow) { + auto result = static_cast((*this)[index]) - other - borrow; + (*this)[index] = static_cast(result); + borrow = static_cast(result >> (bigit_bits * 2 - 1)); + } + + FMT_CONSTEXPR20 void remove_leading_zeros() { + int num_bigits = static_cast(bigits_.size()) - 1; + while (num_bigits > 0 && (*this)[num_bigits] == 0) --num_bigits; + bigits_.resize(to_unsigned(num_bigits + 1)); + } + + // Computes *this -= other assuming aligned bigints and *this >= other. + FMT_CONSTEXPR20 void subtract_aligned(const bigint& other) { + FMT_ASSERT(other.exp_ >= exp_, "unaligned bigints"); + FMT_ASSERT(compare(*this, other) >= 0, ""); + bigit borrow = 0; + int i = other.exp_ - exp_; + for (size_t j = 0, n = other.bigits_.size(); j != n; ++i, ++j) + subtract_bigits(i, other.bigits_[j], borrow); + while (borrow > 0) subtract_bigits(i, 0, borrow); + remove_leading_zeros(); + } + + FMT_CONSTEXPR20 void multiply(uint32_t value) { + const double_bigit wide_value = value; + bigit carry = 0; + for (size_t i = 0, n = bigits_.size(); i < n; ++i) { + double_bigit result = bigits_[i] * wide_value + carry; + bigits_[i] = static_cast(result); + carry = static_cast(result >> bigit_bits); + } + if (carry != 0) bigits_.push_back(carry); + } + + template ::value || + std::is_same::value)> + FMT_CONSTEXPR20 void multiply(UInt value) { + using half_uint = + conditional_t::value, uint64_t, uint32_t>; + const int shift = num_bits() - bigit_bits; + const UInt lower = static_cast(value); + const UInt upper = value >> num_bits(); + UInt carry = 0; + for (size_t i = 0, n = bigits_.size(); i < n; ++i) { + UInt result = lower * bigits_[i] + static_cast(carry); + carry = (upper * bigits_[i] << shift) + (result >> bigit_bits) + + (carry >> bigit_bits); + bigits_[i] = static_cast(result); + } + while (carry != 0) { + bigits_.push_back(static_cast(carry)); + carry >>= bigit_bits; + } + } + + template ::value || + std::is_same::value)> + FMT_CONSTEXPR20 void assign(UInt n) { + size_t num_bigits = 0; + do { + bigits_[num_bigits++] = static_cast(n); + n >>= bigit_bits; + } while (n != 0); + bigits_.resize(num_bigits); + exp_ = 0; + } + + public: + FMT_CONSTEXPR20 bigint() : exp_(0) {} + explicit bigint(uint64_t n) { assign(n); } + + bigint(const bigint&) = delete; + void operator=(const bigint&) = delete; + + FMT_CONSTEXPR20 void assign(const bigint& other) { + auto size = other.bigits_.size(); + bigits_.resize(size); + auto data = other.bigits_.data(); + copy_str(data, data + size, bigits_.data()); + exp_ = other.exp_; + } + + template FMT_CONSTEXPR20 void operator=(Int n) { + FMT_ASSERT(n > 0, ""); + assign(uint64_or_128_t(n)); + } + + FMT_CONSTEXPR20 auto num_bigits() const -> int { + return static_cast(bigits_.size()) + exp_; + } + + FMT_NOINLINE FMT_CONSTEXPR20 auto operator<<=(int shift) -> bigint& { + FMT_ASSERT(shift >= 0, ""); + exp_ += shift / bigit_bits; + shift %= bigit_bits; + if (shift == 0) return *this; + bigit carry = 0; + for (size_t i = 0, n = bigits_.size(); i < n; ++i) { + bigit c = bigits_[i] >> (bigit_bits - shift); + bigits_[i] = (bigits_[i] << shift) + carry; + carry = c; + } + if (carry != 0) bigits_.push_back(carry); + return *this; + } + + template + FMT_CONSTEXPR20 auto operator*=(Int value) -> bigint& { + FMT_ASSERT(value > 0, ""); + multiply(uint32_or_64_or_128_t(value)); + return *this; + } + + friend FMT_CONSTEXPR20 auto compare(const bigint& lhs, const bigint& rhs) + -> int { + int num_lhs_bigits = lhs.num_bigits(), num_rhs_bigits = rhs.num_bigits(); + if (num_lhs_bigits != num_rhs_bigits) + return num_lhs_bigits > num_rhs_bigits ? 1 : -1; + int i = static_cast(lhs.bigits_.size()) - 1; + int j = static_cast(rhs.bigits_.size()) - 1; + int end = i - j; + if (end < 0) end = 0; + for (; i >= end; --i, --j) { + bigit lhs_bigit = lhs[i], rhs_bigit = rhs[j]; + if (lhs_bigit != rhs_bigit) return lhs_bigit > rhs_bigit ? 1 : -1; + } + if (i != j) return i > j ? 1 : -1; + return 0; + } + + // Returns compare(lhs1 + lhs2, rhs). + friend FMT_CONSTEXPR20 auto add_compare(const bigint& lhs1, + const bigint& lhs2, const bigint& rhs) + -> int { + auto minimum = [](int a, int b) { return a < b ? a : b; }; + auto maximum = [](int a, int b) { return a > b ? a : b; }; + int max_lhs_bigits = maximum(lhs1.num_bigits(), lhs2.num_bigits()); + int num_rhs_bigits = rhs.num_bigits(); + if (max_lhs_bigits + 1 < num_rhs_bigits) return -1; + if (max_lhs_bigits > num_rhs_bigits) return 1; + auto get_bigit = [](const bigint& n, int i) -> bigit { + return i >= n.exp_ && i < n.num_bigits() ? n[i - n.exp_] : 0; + }; + double_bigit borrow = 0; + int min_exp = minimum(minimum(lhs1.exp_, lhs2.exp_), rhs.exp_); + for (int i = num_rhs_bigits - 1; i >= min_exp; --i) { + double_bigit sum = + static_cast(get_bigit(lhs1, i)) + get_bigit(lhs2, i); + bigit rhs_bigit = get_bigit(rhs, i); + if (sum > rhs_bigit + borrow) return 1; + borrow = rhs_bigit + borrow - sum; + if (borrow > 1) return -1; + borrow <<= bigit_bits; + } + return borrow != 0 ? -1 : 0; + } + + // Assigns pow(10, exp) to this bigint. + FMT_CONSTEXPR20 void assign_pow10(int exp) { + FMT_ASSERT(exp >= 0, ""); + if (exp == 0) return *this = 1; + // Find the top bit. + int bitmask = 1; + while (exp >= bitmask) bitmask <<= 1; + bitmask >>= 1; + // pow(10, exp) = pow(5, exp) * pow(2, exp). First compute pow(5, exp) by + // repeated squaring and multiplication. + *this = 5; + bitmask >>= 1; + while (bitmask != 0) { + square(); + if ((exp & bitmask) != 0) *this *= 5; + bitmask >>= 1; + } + *this <<= exp; // Multiply by pow(2, exp) by shifting. + } + + FMT_CONSTEXPR20 void square() { + int num_bigits = static_cast(bigits_.size()); + int num_result_bigits = 2 * num_bigits; + basic_memory_buffer n(std::move(bigits_)); + bigits_.resize(to_unsigned(num_result_bigits)); + auto sum = uint128_t(); + for (int bigit_index = 0; bigit_index < num_bigits; ++bigit_index) { + // Compute bigit at position bigit_index of the result by adding + // cross-product terms n[i] * n[j] such that i + j == bigit_index. + for (int i = 0, j = bigit_index; j >= 0; ++i, --j) { + // Most terms are multiplied twice which can be optimized in the future. + sum += static_cast(n[i]) * n[j]; + } + (*this)[bigit_index] = static_cast(sum); + sum >>= num_bits(); // Compute the carry. + } + // Do the same for the top half. + for (int bigit_index = num_bigits; bigit_index < num_result_bigits; + ++bigit_index) { + for (int j = num_bigits - 1, i = bigit_index - j; i < num_bigits;) + sum += static_cast(n[i++]) * n[j--]; + (*this)[bigit_index] = static_cast(sum); + sum >>= num_bits(); + } + remove_leading_zeros(); + exp_ *= 2; + } + + // If this bigint has a bigger exponent than other, adds trailing zero to make + // exponents equal. This simplifies some operations such as subtraction. + FMT_CONSTEXPR20 void align(const bigint& other) { + int exp_difference = exp_ - other.exp_; + if (exp_difference <= 0) return; + int num_bigits = static_cast(bigits_.size()); + bigits_.resize(to_unsigned(num_bigits + exp_difference)); + for (int i = num_bigits - 1, j = i + exp_difference; i >= 0; --i, --j) + bigits_[j] = bigits_[i]; + std::uninitialized_fill_n(bigits_.data(), exp_difference, 0u); + exp_ -= exp_difference; + } + + // Divides this bignum by divisor, assigning the remainder to this and + // returning the quotient. + FMT_CONSTEXPR20 auto divmod_assign(const bigint& divisor) -> int { + FMT_ASSERT(this != &divisor, ""); + if (compare(*this, divisor) < 0) return 0; + FMT_ASSERT(divisor.bigits_[divisor.bigits_.size() - 1u] != 0, ""); + align(divisor); + int quotient = 0; + do { + subtract_aligned(divisor); + ++quotient; + } while (compare(*this, divisor) >= 0); + return quotient; + } +}; + +// format_dragon flags. +enum dragon { + predecessor_closer = 1, + fixup = 2, // Run fixup to correct exp10 which can be off by one. + fixed = 4, +}; + +// Formats a floating-point number using a variation of the Fixed-Precision +// Positive Floating-Point Printout ((FPP)^2) algorithm by Steele & White: +// https://fmt.dev/papers/p372-steele.pdf. +FMT_CONSTEXPR20 inline void format_dragon(basic_fp value, + unsigned flags, int num_digits, + buffer& buf, int& exp10) { + bigint numerator; // 2 * R in (FPP)^2. + bigint denominator; // 2 * S in (FPP)^2. + // lower and upper are differences between value and corresponding boundaries. + bigint lower; // (M^- in (FPP)^2). + bigint upper_store; // upper's value if different from lower. + bigint* upper = nullptr; // (M^+ in (FPP)^2). + // Shift numerator and denominator by an extra bit or two (if lower boundary + // is closer) to make lower and upper integers. This eliminates multiplication + // by 2 during later computations. + bool is_predecessor_closer = (flags & dragon::predecessor_closer) != 0; + int shift = is_predecessor_closer ? 2 : 1; + if (value.e >= 0) { + numerator = value.f; + numerator <<= value.e + shift; + lower = 1; + lower <<= value.e; + if (is_predecessor_closer) { + upper_store = 1; + upper_store <<= value.e + 1; + upper = &upper_store; + } + denominator.assign_pow10(exp10); + denominator <<= shift; + } else if (exp10 < 0) { + numerator.assign_pow10(-exp10); + lower.assign(numerator); + if (is_predecessor_closer) { + upper_store.assign(numerator); + upper_store <<= 1; + upper = &upper_store; + } + numerator *= value.f; + numerator <<= shift; + denominator = 1; + denominator <<= shift - value.e; + } else { + numerator = value.f; + numerator <<= shift; + denominator.assign_pow10(exp10); + denominator <<= shift - value.e; + lower = 1; + if (is_predecessor_closer) { + upper_store = 1ULL << 1; + upper = &upper_store; + } + } + int even = static_cast((value.f & 1) == 0); + if (!upper) upper = &lower; + bool shortest = num_digits < 0; + if ((flags & dragon::fixup) != 0) { + if (add_compare(numerator, *upper, denominator) + even <= 0) { + --exp10; + numerator *= 10; + if (num_digits < 0) { + lower *= 10; + if (upper != &lower) *upper *= 10; + } + } + if ((flags & dragon::fixed) != 0) adjust_precision(num_digits, exp10 + 1); + } + // Invariant: value == (numerator / denominator) * pow(10, exp10). + if (shortest) { + // Generate the shortest representation. + num_digits = 0; + char* data = buf.data(); + for (;;) { + int digit = numerator.divmod_assign(denominator); + bool low = compare(numerator, lower) - even < 0; // numerator <[=] lower. + // numerator + upper >[=] pow10: + bool high = add_compare(numerator, *upper, denominator) + even > 0; + data[num_digits++] = static_cast('0' + digit); + if (low || high) { + if (!low) { + ++data[num_digits - 1]; + } else if (high) { + int result = add_compare(numerator, numerator, denominator); + // Round half to even. + if (result > 0 || (result == 0 && (digit % 2) != 0)) + ++data[num_digits - 1]; + } + buf.try_resize(to_unsigned(num_digits)); + exp10 -= num_digits - 1; + return; + } + numerator *= 10; + lower *= 10; + if (upper != &lower) *upper *= 10; + } + } + // Generate the given number of digits. + exp10 -= num_digits - 1; + if (num_digits <= 0) { + denominator *= 10; + auto digit = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0'; + buf.push_back(digit); + return; + } + buf.try_resize(to_unsigned(num_digits)); + for (int i = 0; i < num_digits - 1; ++i) { + int digit = numerator.divmod_assign(denominator); + buf[i] = static_cast('0' + digit); + numerator *= 10; + } + int digit = numerator.divmod_assign(denominator); + auto result = add_compare(numerator, numerator, denominator); + if (result > 0 || (result == 0 && (digit % 2) != 0)) { + if (digit == 9) { + const auto overflow = '0' + 10; + buf[num_digits - 1] = overflow; + // Propagate the carry. + for (int i = num_digits - 1; i > 0 && buf[i] == overflow; --i) { + buf[i] = '0'; + ++buf[i - 1]; + } + if (buf[0] == overflow) { + buf[0] = '1'; + if ((flags & dragon::fixed) != 0) + buf.push_back('0'); + else + ++exp10; + } + return; + } + ++digit; + } + buf[num_digits - 1] = static_cast('0' + digit); +} + +// Formats a floating-point number using the hexfloat format. +template ::value)> +FMT_CONSTEXPR20 void format_hexfloat(Float value, int precision, + float_specs specs, buffer& buf) { + // float is passed as double to reduce the number of instantiations and to + // simplify implementation. + static_assert(!std::is_same::value, ""); + + using info = dragonbox::float_info; + + // Assume Float is in the format [sign][exponent][significand]. + using carrier_uint = typename info::carrier_uint; + + constexpr auto num_float_significand_bits = + detail::num_significand_bits(); + + basic_fp f(value); + f.e += num_float_significand_bits; + if (!has_implicit_bit()) --f.e; + + constexpr auto num_fraction_bits = + num_float_significand_bits + (has_implicit_bit() ? 1 : 0); + constexpr auto num_xdigits = (num_fraction_bits + 3) / 4; + + constexpr auto leading_shift = ((num_xdigits - 1) * 4); + const auto leading_mask = carrier_uint(0xF) << leading_shift; + const auto leading_xdigit = + static_cast((f.f & leading_mask) >> leading_shift); + if (leading_xdigit > 1) f.e -= (32 - countl_zero(leading_xdigit) - 1); + + int print_xdigits = num_xdigits - 1; + if (precision >= 0 && print_xdigits > precision) { + const int shift = ((print_xdigits - precision - 1) * 4); + const auto mask = carrier_uint(0xF) << shift; + const auto v = static_cast((f.f & mask) >> shift); + + if (v >= 8) { + const auto inc = carrier_uint(1) << (shift + 4); + f.f += inc; + f.f &= ~(inc - 1); + } + + // Check long double overflow + if (!has_implicit_bit()) { + const auto implicit_bit = carrier_uint(1) << num_float_significand_bits; + if ((f.f & implicit_bit) == implicit_bit) { + f.f >>= 4; + f.e += 4; + } + } + + print_xdigits = precision; + } + + char xdigits[num_bits() / 4]; + detail::fill_n(xdigits, sizeof(xdigits), '0'); + format_uint<4>(xdigits, f.f, num_xdigits, specs.upper); + + // Remove zero tail + while (print_xdigits > 0 && xdigits[print_xdigits] == '0') --print_xdigits; + + buf.push_back('0'); + buf.push_back(specs.upper ? 'X' : 'x'); + buf.push_back(xdigits[0]); + if (specs.showpoint || print_xdigits > 0 || print_xdigits < precision) + buf.push_back('.'); + buf.append(xdigits + 1, xdigits + 1 + print_xdigits); + for (; print_xdigits < precision; ++print_xdigits) buf.push_back('0'); + + buf.push_back(specs.upper ? 'P' : 'p'); + + uint32_t abs_e; + if (f.e < 0) { + buf.push_back('-'); + abs_e = static_cast(-f.e); + } else { + buf.push_back('+'); + abs_e = static_cast(f.e); + } + format_decimal(appender(buf), abs_e, detail::count_digits(abs_e)); +} + +template ::value)> +FMT_CONSTEXPR20 void format_hexfloat(Float value, int precision, + float_specs specs, buffer& buf) { + format_hexfloat(static_cast(value), precision, specs, buf); +} + +constexpr auto fractional_part_rounding_thresholds(int index) -> uint32_t { + // For checking rounding thresholds. + // The kth entry is chosen to be the smallest integer such that the + // upper 32-bits of 10^(k+1) times it is strictly bigger than 5 * 10^k. + // It is equal to ceil(2^31 + 2^32/10^(k + 1)). + // These are stored in a string literal because we cannot have static arrays + // in constexpr functions and non-static ones are poorly optimized. + return U"\x9999999a\x828f5c29\x80418938\x80068db9\x8000a7c6\x800010c7" + U"\x800001ae\x8000002b"[index]; +} + +template +FMT_CONSTEXPR20 auto format_float(Float value, int precision, float_specs specs, + buffer& buf) -> int { + // float is passed as double to reduce the number of instantiations. + static_assert(!std::is_same::value, ""); + FMT_ASSERT(value >= 0, "value is negative"); + auto converted_value = convert_float(value); + + const bool fixed = specs.format == float_format::fixed; + if (value <= 0) { // <= instead of == to silence a warning. + if (precision <= 0 || !fixed) { + buf.push_back('0'); + return 0; + } + buf.try_resize(to_unsigned(precision)); + fill_n(buf.data(), precision, '0'); + return -precision; + } + + int exp = 0; + bool use_dragon = true; + unsigned dragon_flags = 0; + if (!is_fast_float() || is_constant_evaluated()) { + const auto inv_log2_10 = 0.3010299956639812; // 1 / log2(10) + using info = dragonbox::float_info; + const auto f = basic_fp(converted_value); + // Compute exp, an approximate power of 10, such that + // 10^(exp - 1) <= value < 10^exp or 10^exp <= value < 10^(exp + 1). + // This is based on log10(value) == log2(value) / log2(10) and approximation + // of log2(value) by e + num_fraction_bits idea from double-conversion. + auto e = (f.e + count_digits<1>(f.f) - 1) * inv_log2_10 - 1e-10; + exp = static_cast(e); + if (e > exp) ++exp; // Compute ceil. + dragon_flags = dragon::fixup; + } else if (precision < 0) { + // Use Dragonbox for the shortest format. + if (specs.binary32) { + auto dec = dragonbox::to_decimal(static_cast(value)); + write(buffer_appender(buf), dec.significand); + return dec.exponent; + } + auto dec = dragonbox::to_decimal(static_cast(value)); + write(buffer_appender(buf), dec.significand); + return dec.exponent; + } else { + // Extract significand bits and exponent bits. + using info = dragonbox::float_info; + auto br = bit_cast(static_cast(value)); + + const uint64_t significand_mask = + (static_cast(1) << num_significand_bits()) - 1; + uint64_t significand = (br & significand_mask); + int exponent = static_cast((br & exponent_mask()) >> + num_significand_bits()); + + if (exponent != 0) { // Check if normal. + exponent -= exponent_bias() + num_significand_bits(); + significand |= + (static_cast(1) << num_significand_bits()); + significand <<= 1; + } else { + // Normalize subnormal inputs. + FMT_ASSERT(significand != 0, "zeros should not appear here"); + int shift = countl_zero(significand); + FMT_ASSERT(shift >= num_bits() - num_significand_bits(), + ""); + shift -= (num_bits() - num_significand_bits() - 2); + exponent = (std::numeric_limits::min_exponent - + num_significand_bits()) - + shift; + significand <<= shift; + } + + // Compute the first several nonzero decimal significand digits. + // We call the number we get the first segment. + const int k = info::kappa - dragonbox::floor_log10_pow2(exponent); + exp = -k; + const int beta = exponent + dragonbox::floor_log2_pow10(k); + uint64_t first_segment; + bool has_more_segments; + int digits_in_the_first_segment; + { + const auto r = dragonbox::umul192_upper128( + significand << beta, dragonbox::get_cached_power(k)); + first_segment = r.high(); + has_more_segments = r.low() != 0; + + // The first segment can have 18 ~ 19 digits. + if (first_segment >= 1000000000000000000ULL) { + digits_in_the_first_segment = 19; + } else { + // When it is of 18-digits, we align it to 19-digits by adding a bogus + // zero at the end. + digits_in_the_first_segment = 18; + first_segment *= 10; + } + } + + // Compute the actual number of decimal digits to print. + if (fixed) adjust_precision(precision, exp + digits_in_the_first_segment); + + // Use Dragon4 only when there might be not enough digits in the first + // segment. + if (digits_in_the_first_segment > precision) { + use_dragon = false; + + if (precision <= 0) { + exp += digits_in_the_first_segment; + + if (precision < 0) { + // Nothing to do, since all we have are just leading zeros. + buf.try_resize(0); + } else { + // We may need to round-up. + buf.try_resize(1); + if ((first_segment | static_cast(has_more_segments)) > + 5000000000000000000ULL) { + buf[0] = '1'; + } else { + buf[0] = '0'; + } + } + } // precision <= 0 + else { + exp += digits_in_the_first_segment - precision; + + // When precision > 0, we divide the first segment into three + // subsegments, each with 9, 9, and 0 ~ 1 digits so that each fits + // in 32-bits which usually allows faster calculation than in + // 64-bits. Since some compiler (e.g. MSVC) doesn't know how to optimize + // division-by-constant for large 64-bit divisors, we do it here + // manually. The magic number 7922816251426433760 below is equal to + // ceil(2^(64+32) / 10^10). + const uint32_t first_subsegment = static_cast( + dragonbox::umul128_upper64(first_segment, 7922816251426433760ULL) >> + 32); + const uint64_t second_third_subsegments = + first_segment - first_subsegment * 10000000000ULL; + + uint64_t prod; + uint32_t digits; + bool should_round_up; + int number_of_digits_to_print = precision > 9 ? 9 : precision; + + // Print a 9-digits subsegment, either the first or the second. + auto print_subsegment = [&](uint32_t subsegment, char* buffer) { + int number_of_digits_printed = 0; + + // If we want to print an odd number of digits from the subsegment, + if ((number_of_digits_to_print & 1) != 0) { + // Convert to 64-bit fixed-point fractional form with 1-digit + // integer part. The magic number 720575941 is a good enough + // approximation of 2^(32 + 24) / 10^8; see + // https://jk-jeon.github.io/posts/2022/12/fixed-precision-formatting/#fixed-length-case + // for details. + prod = ((subsegment * static_cast(720575941)) >> 24) + 1; + digits = static_cast(prod >> 32); + *buffer = static_cast('0' + digits); + number_of_digits_printed++; + } + // If we want to print an even number of digits from the + // first_subsegment, + else { + // Convert to 64-bit fixed-point fractional form with 2-digits + // integer part. The magic number 450359963 is a good enough + // approximation of 2^(32 + 20) / 10^7; see + // https://jk-jeon.github.io/posts/2022/12/fixed-precision-formatting/#fixed-length-case + // for details. + prod = ((subsegment * static_cast(450359963)) >> 20) + 1; + digits = static_cast(prod >> 32); + copy2(buffer, digits2(digits)); + number_of_digits_printed += 2; + } + + // Print all digit pairs. + while (number_of_digits_printed < number_of_digits_to_print) { + prod = static_cast(prod) * static_cast(100); + digits = static_cast(prod >> 32); + copy2(buffer + number_of_digits_printed, digits2(digits)); + number_of_digits_printed += 2; + } + }; + + // Print first subsegment. + print_subsegment(first_subsegment, buf.data()); + + // Perform rounding if the first subsegment is the last subsegment to + // print. + if (precision <= 9) { + // Rounding inside the subsegment. + // We round-up if: + // - either the fractional part is strictly larger than 1/2, or + // - the fractional part is exactly 1/2 and the last digit is odd. + // We rely on the following observations: + // - If fractional_part >= threshold, then the fractional part is + // strictly larger than 1/2. + // - If the MSB of fractional_part is set, then the fractional part + // must be at least 1/2. + // - When the MSB of fractional_part is set, either + // second_third_subsegments being nonzero or has_more_segments + // being true means there are further digits not printed, so the + // fractional part is strictly larger than 1/2. + if (precision < 9) { + uint32_t fractional_part = static_cast(prod); + should_round_up = + fractional_part >= fractional_part_rounding_thresholds( + 8 - number_of_digits_to_print) || + ((fractional_part >> 31) & + ((digits & 1) | (second_third_subsegments != 0) | + has_more_segments)) != 0; + } + // Rounding at the subsegment boundary. + // In this case, the fractional part is at least 1/2 if and only if + // second_third_subsegments >= 5000000000ULL, and is strictly larger + // than 1/2 if we further have either second_third_subsegments > + // 5000000000ULL or has_more_segments == true. + else { + should_round_up = second_third_subsegments > 5000000000ULL || + (second_third_subsegments == 5000000000ULL && + ((digits & 1) != 0 || has_more_segments)); + } + } + // Otherwise, print the second subsegment. + else { + // Compilers are not aware of how to leverage the maximum value of + // second_third_subsegments to find out a better magic number which + // allows us to eliminate an additional shift. 1844674407370955162 = + // ceil(2^64/10) < ceil(2^64*(10^9/(10^10 - 1))). + const uint32_t second_subsegment = + static_cast(dragonbox::umul128_upper64( + second_third_subsegments, 1844674407370955162ULL)); + const uint32_t third_subsegment = + static_cast(second_third_subsegments) - + second_subsegment * 10; + + number_of_digits_to_print = precision - 9; + print_subsegment(second_subsegment, buf.data() + 9); + + // Rounding inside the subsegment. + if (precision < 18) { + // The condition third_subsegment != 0 implies that the segment was + // of 19 digits, so in this case the third segment should be + // consisting of a genuine digit from the input. + uint32_t fractional_part = static_cast(prod); + should_round_up = + fractional_part >= fractional_part_rounding_thresholds( + 8 - number_of_digits_to_print) || + ((fractional_part >> 31) & + ((digits & 1) | (third_subsegment != 0) | + has_more_segments)) != 0; + } + // Rounding at the subsegment boundary. + else { + // In this case, the segment must be of 19 digits, thus + // the third subsegment should be consisting of a genuine digit from + // the input. + should_round_up = third_subsegment > 5 || + (third_subsegment == 5 && + ((digits & 1) != 0 || has_more_segments)); + } + } + + // Round-up if necessary. + if (should_round_up) { + ++buf[precision - 1]; + for (int i = precision - 1; i > 0 && buf[i] > '9'; --i) { + buf[i] = '0'; + ++buf[i - 1]; + } + if (buf[0] > '9') { + buf[0] = '1'; + if (fixed) + buf[precision++] = '0'; + else + ++exp; + } + } + buf.try_resize(to_unsigned(precision)); + } + } // if (digits_in_the_first_segment > precision) + else { + // Adjust the exponent for its use in Dragon4. + exp += digits_in_the_first_segment - 1; + } + } + if (use_dragon) { + auto f = basic_fp(); + bool is_predecessor_closer = specs.binary32 + ? f.assign(static_cast(value)) + : f.assign(converted_value); + if (is_predecessor_closer) dragon_flags |= dragon::predecessor_closer; + if (fixed) dragon_flags |= dragon::fixed; + // Limit precision to the maximum possible number of significant digits in + // an IEEE754 double because we don't need to generate zeros. + const int max_double_digits = 767; + if (precision > max_double_digits) precision = max_double_digits; + format_dragon(f, dragon_flags, precision, buf, exp); + } + if (!fixed && !specs.showpoint) { + // Remove trailing zeros. + auto num_digits = buf.size(); + while (num_digits > 0 && buf[num_digits - 1] == '0') { + --num_digits; + ++exp; + } + buf.try_resize(num_digits); + } + return exp; +} +template +FMT_CONSTEXPR20 auto write_float(OutputIt out, T value, + format_specs specs, locale_ref loc) + -> OutputIt { + float_specs fspecs = parse_float_type_spec(specs); + fspecs.sign = specs.sign; + if (detail::signbit(value)) { // value < 0 is false for NaN so use signbit. + fspecs.sign = sign::minus; + value = -value; + } else if (fspecs.sign == sign::minus) { + fspecs.sign = sign::none; + } + + if (!detail::isfinite(value)) + return write_nonfinite(out, detail::isnan(value), specs, fspecs); + + if (specs.align == align::numeric && fspecs.sign) { + auto it = reserve(out, 1); + *it++ = detail::sign(fspecs.sign); + out = base_iterator(out, it); + fspecs.sign = sign::none; + if (specs.width != 0) --specs.width; + } + + memory_buffer buffer; + if (fspecs.format == float_format::hex) { + if (fspecs.sign) buffer.push_back(detail::sign(fspecs.sign)); + format_hexfloat(convert_float(value), specs.precision, fspecs, buffer); + return write_bytes(out, {buffer.data(), buffer.size()}, + specs); + } + int precision = specs.precision >= 0 || specs.type == presentation_type::none + ? specs.precision + : 6; + if (fspecs.format == float_format::exp) { + if (precision == max_value()) + throw_format_error("number is too big"); + else + ++precision; + } else if (fspecs.format != float_format::fixed && precision == 0) { + precision = 1; + } + if (const_check(std::is_same())) fspecs.binary32 = true; + int exp = format_float(convert_float(value), precision, fspecs, buffer); + fspecs.precision = precision; + auto f = big_decimal_fp{buffer.data(), static_cast(buffer.size()), exp}; + return write_float(out, f, specs, fspecs, loc); +} + +template ::value)> +FMT_CONSTEXPR20 auto write(OutputIt out, T value, format_specs specs, + locale_ref loc = {}) -> OutputIt { + if (const_check(!is_supported_floating_point(value))) return out; + return specs.localized && write_loc(out, value, specs, loc) + ? out + : write_float(out, value, specs, loc); +} + +template ::value)> +FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt { + if (is_constant_evaluated()) return write(out, value, format_specs()); + if (const_check(!is_supported_floating_point(value))) return out; + + auto fspecs = float_specs(); + if (detail::signbit(value)) { + fspecs.sign = sign::minus; + value = -value; + } + + constexpr auto specs = format_specs(); + using floaty = conditional_t::value, double, T>; + using floaty_uint = typename dragonbox::float_info::carrier_uint; + floaty_uint mask = exponent_mask(); + if ((bit_cast(value) & mask) == mask) + return write_nonfinite(out, std::isnan(value), specs, fspecs); + + auto dec = dragonbox::to_decimal(static_cast(value)); + return write_float(out, dec, specs, fspecs, {}); +} + +template ::value && + !is_fast_float::value)> +inline auto write(OutputIt out, T value) -> OutputIt { + return write(out, value, format_specs()); +} + +template +auto write(OutputIt out, monostate, format_specs = {}, locale_ref = {}) + -> OutputIt { + FMT_ASSERT(false, ""); + return out; +} + +template +FMT_CONSTEXPR auto write(OutputIt out, basic_string_view value) + -> OutputIt { + auto it = reserve(out, value.size()); + it = copy_str_noinline(value.begin(), value.end(), it); + return base_iterator(out, it); +} + +template ::value)> +constexpr auto write(OutputIt out, const T& value) -> OutputIt { + return write(out, to_string_view(value)); +} + +// FMT_ENABLE_IF() condition separated to workaround an MSVC bug. +template < + typename Char, typename OutputIt, typename T, + bool check = + std::is_enum::value && !std::is_same::value && + mapped_type_constant>::value != + type::custom_type, + FMT_ENABLE_IF(check)> +FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt { + return write(out, static_cast>(value)); +} + +template ::value)> +FMT_CONSTEXPR auto write(OutputIt out, T value, + const format_specs& specs = {}, locale_ref = {}) + -> OutputIt { + return specs.type != presentation_type::none && + specs.type != presentation_type::string + ? write(out, value ? 1 : 0, specs, {}) + : write_bytes(out, value ? "true" : "false", specs); +} + +template +FMT_CONSTEXPR auto write(OutputIt out, Char value) -> OutputIt { + auto it = reserve(out, 1); + *it++ = value; + return base_iterator(out, it); +} + +template +FMT_CONSTEXPR_CHAR_TRAITS auto write(OutputIt out, const Char* value) + -> OutputIt { + if (value) return write(out, basic_string_view(value)); + throw_format_error("string pointer is null"); + return out; +} + +template ::value)> +auto write(OutputIt out, const T* value, const format_specs& specs = {}, + locale_ref = {}) -> OutputIt { + return write_ptr(out, bit_cast(value), &specs); +} + +// A write overload that handles implicit conversions. +template > +FMT_CONSTEXPR auto write(OutputIt out, const T& value) -> enable_if_t< + std::is_class::value && !is_string::value && + !is_floating_point::value && !std::is_same::value && + !std::is_same().map( + value))>>::value, + OutputIt> { + return write(out, arg_mapper().map(value)); +} + +template > +FMT_CONSTEXPR auto write(OutputIt out, const T& value) + -> enable_if_t::value == type::custom_type, + OutputIt> { + auto formatter = typename Context::template formatter_type(); + auto parse_ctx = typename Context::parse_context_type({}); + formatter.parse(parse_ctx); + auto ctx = Context(out, {}, {}); + return formatter.format(value, ctx); +} + +// An argument visitor that formats the argument and writes it via the output +// iterator. It's a class and not a generic lambda for compatibility with C++11. +template struct default_arg_formatter { + using iterator = buffer_appender; + using context = buffer_context; + + iterator out; + basic_format_args args; + locale_ref loc; + + template auto operator()(T value) -> iterator { + return write(out, value); + } + auto operator()(typename basic_format_arg::handle h) -> iterator { + basic_format_parse_context parse_ctx({}); + context format_ctx(out, args, loc); + h.format(parse_ctx, format_ctx); + return format_ctx.out(); + } +}; + +template struct arg_formatter { + using iterator = buffer_appender; + using context = buffer_context; + + iterator out; + const format_specs& specs; + locale_ref locale; + + template + FMT_CONSTEXPR FMT_INLINE auto operator()(T value) -> iterator { + return detail::write(out, value, specs, locale); + } + auto operator()(typename basic_format_arg::handle) -> iterator { + // User-defined types are handled separately because they require access + // to the parse context. + return out; + } +}; + +struct width_checker { + template ::value)> + FMT_CONSTEXPR auto operator()(T value) -> unsigned long long { + if (is_negative(value)) throw_format_error("negative width"); + return static_cast(value); + } + + template ::value)> + FMT_CONSTEXPR auto operator()(T) -> unsigned long long { + throw_format_error("width is not integer"); + return 0; + } +}; + +struct precision_checker { + template ::value)> + FMT_CONSTEXPR auto operator()(T value) -> unsigned long long { + if (is_negative(value)) throw_format_error("negative precision"); + return static_cast(value); + } + + template ::value)> + FMT_CONSTEXPR auto operator()(T) -> unsigned long long { + throw_format_error("precision is not integer"); + return 0; + } +}; + +template +FMT_CONSTEXPR auto get_dynamic_spec(FormatArg arg) -> int { + unsigned long long value = visit_format_arg(Handler(), arg); + if (value > to_unsigned(max_value())) + throw_format_error("number is too big"); + return static_cast(value); +} + +template +FMT_CONSTEXPR auto get_arg(Context& ctx, ID id) -> decltype(ctx.arg(id)) { + auto arg = ctx.arg(id); + if (!arg) ctx.on_error("argument not found"); + return arg; +} + +template +FMT_CONSTEXPR void handle_dynamic_spec(int& value, + arg_ref ref, + Context& ctx) { + switch (ref.kind) { + case arg_id_kind::none: + break; + case arg_id_kind::index: + value = detail::get_dynamic_spec(get_arg(ctx, ref.val.index)); + break; + case arg_id_kind::name: + value = detail::get_dynamic_spec(get_arg(ctx, ref.val.name)); + break; + } +} + +#if FMT_USE_USER_DEFINED_LITERALS +# if FMT_USE_NONTYPE_TEMPLATE_ARGS +template Str> +struct statically_named_arg : view { + static constexpr auto name = Str.data; + + const T& value; + statically_named_arg(const T& v) : value(v) {} +}; + +template Str> +struct is_named_arg> : std::true_type {}; + +template Str> +struct is_statically_named_arg> + : std::true_type {}; + +template Str> +struct udl_arg { + template auto operator=(T&& value) const { + return statically_named_arg(std::forward(value)); + } +}; +# else +template struct udl_arg { + const Char* str; + + template auto operator=(T&& value) const -> named_arg { + return {str, std::forward(value)}; + } +}; +# endif +#endif // FMT_USE_USER_DEFINED_LITERALS + +template +auto vformat(const Locale& loc, basic_string_view fmt, + basic_format_args>> args) + -> std::basic_string { + auto buf = basic_memory_buffer(); + detail::vformat_to(buf, fmt, args, detail::locale_ref(loc)); + return {buf.data(), buf.size()}; +} + +using format_func = void (*)(detail::buffer&, int, const char*); + +FMT_API void format_error_code(buffer& out, int error_code, + string_view message) noexcept; + +FMT_API void report_error(format_func func, int error_code, + const char* message) noexcept; +} // namespace detail + +FMT_API auto vsystem_error(int error_code, string_view format_str, + format_args args) -> std::system_error; + +/** + \rst + Constructs :class:`std::system_error` with a message formatted with + ``fmt::format(fmt, args...)``. + *error_code* is a system error code as given by ``errno``. + + **Example**:: + + // This throws std::system_error with the description + // cannot open file 'madeup': No such file or directory + // or similar (system message may vary). + const char* filename = "madeup"; + std::FILE* file = std::fopen(filename, "r"); + if (!file) + throw fmt::system_error(errno, "cannot open file '{}'", filename); + \endrst + */ +template +auto system_error(int error_code, format_string fmt, T&&... args) + -> std::system_error { + return vsystem_error(error_code, fmt, fmt::make_format_args(args...)); +} + +/** + \rst + Formats an error message for an error returned by an operating system or a + language runtime, for example a file opening error, and writes it to *out*. + The format is the same as the one used by ``std::system_error(ec, message)`` + where ``ec`` is ``std::error_code(error_code, std::generic_category()})``. + It is implementation-defined but normally looks like: + + .. parsed-literal:: + **: ** + + where ** is the passed message and ** is the system + message corresponding to the error code. + *error_code* is a system error code as given by ``errno``. + \endrst + */ +FMT_API void format_system_error(detail::buffer& out, int error_code, + const char* message) noexcept; + +// Reports a system error without throwing an exception. +// Can be used to report errors from destructors. +FMT_API void report_system_error(int error_code, const char* message) noexcept; + +/** Fast integer formatter. */ +class format_int { + private: + // Buffer should be large enough to hold all digits (digits10 + 1), + // a sign and a null character. + enum { buffer_size = std::numeric_limits::digits10 + 3 }; + mutable char buffer_[buffer_size]; + char* str_; + + template auto format_unsigned(UInt value) -> char* { + auto n = static_cast>(value); + return detail::format_decimal(buffer_, n, buffer_size - 1).begin; + } + + template auto format_signed(Int value) -> char* { + auto abs_value = static_cast>(value); + bool negative = value < 0; + if (negative) abs_value = 0 - abs_value; + auto begin = format_unsigned(abs_value); + if (negative) *--begin = '-'; + return begin; + } + + public: + explicit format_int(int value) : str_(format_signed(value)) {} + explicit format_int(long value) : str_(format_signed(value)) {} + explicit format_int(long long value) : str_(format_signed(value)) {} + explicit format_int(unsigned value) : str_(format_unsigned(value)) {} + explicit format_int(unsigned long value) : str_(format_unsigned(value)) {} + explicit format_int(unsigned long long value) + : str_(format_unsigned(value)) {} + + /** Returns the number of characters written to the output buffer. */ + auto size() const -> size_t { + return detail::to_unsigned(buffer_ - str_ + buffer_size - 1); + } + + /** + Returns a pointer to the output buffer content. No terminating null + character is appended. + */ + auto data() const -> const char* { return str_; } + + /** + Returns a pointer to the output buffer content with terminating null + character appended. + */ + auto c_str() const -> const char* { + buffer_[buffer_size - 1] = '\0'; + return str_; + } + + /** + \rst + Returns the content of the output buffer as an ``std::string``. + \endrst + */ + auto str() const -> std::string { return std::string(str_, size()); } +}; + +template +struct formatter::value>> + : formatter, Char> { + template + auto format(const T& value, FormatContext& ctx) const -> decltype(ctx.out()) { + using base = formatter, Char>; + return base::format(format_as(value), ctx); + } +}; + +#define FMT_FORMAT_AS(Type, Base) \ + template \ + struct formatter : formatter {} + +FMT_FORMAT_AS(signed char, int); +FMT_FORMAT_AS(unsigned char, unsigned); +FMT_FORMAT_AS(short, int); +FMT_FORMAT_AS(unsigned short, unsigned); +FMT_FORMAT_AS(long, detail::long_type); +FMT_FORMAT_AS(unsigned long, detail::ulong_type); +FMT_FORMAT_AS(Char*, const Char*); +FMT_FORMAT_AS(std::basic_string, basic_string_view); +FMT_FORMAT_AS(std::nullptr_t, const void*); +FMT_FORMAT_AS(detail::std_string_view, basic_string_view); +FMT_FORMAT_AS(void*, const void*); + +template +struct formatter : formatter, Char> {}; + +/** + \rst + Converts ``p`` to ``const void*`` for pointer formatting. + + **Example**:: + + auto s = fmt::format("{}", fmt::ptr(p)); + \endrst + */ +template auto ptr(T p) -> const void* { + static_assert(std::is_pointer::value, ""); + return detail::bit_cast(p); +} +template +auto ptr(const std::unique_ptr& p) -> const void* { + return p.get(); +} +template auto ptr(const std::shared_ptr& p) -> const void* { + return p.get(); +} + +/** + \rst + Converts ``e`` to the underlying type. + + **Example**:: + + enum class color { red, green, blue }; + auto s = fmt::format("{}", fmt::underlying(color::red)); + \endrst + */ +template +constexpr auto underlying(Enum e) noexcept -> underlying_t { + return static_cast>(e); +} + +namespace enums { +template ::value)> +constexpr auto format_as(Enum e) noexcept -> underlying_t { + return static_cast>(e); +} +} // namespace enums + +class bytes { + private: + string_view data_; + friend struct formatter; + + public: + explicit bytes(string_view data) : data_(data) {} +}; + +template <> struct formatter { + private: + detail::dynamic_format_specs<> specs_; + + public: + template + FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const char* { + return parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx, + detail::type::string_type); + } + + template + auto format(bytes b, FormatContext& ctx) -> decltype(ctx.out()) { + detail::handle_dynamic_spec(specs_.width, + specs_.width_ref, ctx); + detail::handle_dynamic_spec( + specs_.precision, specs_.precision_ref, ctx); + return detail::write_bytes(ctx.out(), b.data_, specs_); + } +}; + +// group_digits_view is not derived from view because it copies the argument. +template struct group_digits_view { + T value; +}; + +/** + \rst + Returns a view that formats an integer value using ',' as a locale-independent + thousands separator. + + **Example**:: + + fmt::print("{}", fmt::group_digits(12345)); + // Output: "12,345" + \endrst + */ +template auto group_digits(T value) -> group_digits_view { + return {value}; +} + +template struct formatter> : formatter { + private: + detail::dynamic_format_specs<> specs_; + + public: + template + FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const char* { + return parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx, + detail::type::int_type); + } + + template + auto format(group_digits_view t, FormatContext& ctx) + -> decltype(ctx.out()) { + detail::handle_dynamic_spec(specs_.width, + specs_.width_ref, ctx); + detail::handle_dynamic_spec( + specs_.precision, specs_.precision_ref, ctx); + return detail::write_int( + ctx.out(), static_cast>(t.value), 0, specs_, + detail::digit_grouping("\3", ",")); + } +}; + +template struct nested_view { + const formatter* fmt; + const T* value; +}; + +template struct formatter> { + FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> const char* { + return ctx.begin(); + } + auto format(nested_view view, format_context& ctx) const + -> decltype(ctx.out()) { + return view.fmt->format(*view.value, ctx); + } +}; + +template struct nested_formatter { + private: + int width_; + detail::fill_t fill_; + align_t align_ : 4; + formatter formatter_; + + public: + constexpr nested_formatter() : width_(0), align_(align_t::none) {} + + FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> const char* { + auto specs = detail::dynamic_format_specs(); + auto it = parse_format_specs(ctx.begin(), ctx.end(), specs, ctx, + detail::type::none_type); + width_ = specs.width; + fill_ = specs.fill; + align_ = specs.align; + ctx.advance_to(it); + return formatter_.parse(ctx); + } + + template + auto write_padded(format_context& ctx, F write) const -> decltype(ctx.out()) { + if (width_ == 0) return write(ctx.out()); + auto buf = memory_buffer(); + write(std::back_inserter(buf)); + auto specs = format_specs<>(); + specs.width = width_; + specs.fill = fill_; + specs.align = align_; + return detail::write(ctx.out(), string_view(buf.data(), buf.size()), specs); + } + + auto nested(const T& value) const -> nested_view { + return nested_view{&formatter_, &value}; + } +}; + +// DEPRECATED! join_view will be moved to ranges.h. +template +struct join_view : detail::view { + It begin; + Sentinel end; + basic_string_view sep; + + join_view(It b, Sentinel e, basic_string_view s) + : begin(b), end(e), sep(s) {} +}; + +template +struct formatter, Char> { + private: + using value_type = +#ifdef __cpp_lib_ranges + std::iter_value_t; +#else + typename std::iterator_traits::value_type; +#endif + formatter, Char> value_formatter_; + + public: + template + FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const Char* { + return value_formatter_.parse(ctx); + } + + template + auto format(const join_view& value, + FormatContext& ctx) const -> decltype(ctx.out()) { + auto it = value.begin; + auto out = ctx.out(); + if (it != value.end) { + out = value_formatter_.format(*it, ctx); + ++it; + while (it != value.end) { + out = detail::copy_str(value.sep.begin(), value.sep.end(), out); + ctx.advance_to(out); + out = value_formatter_.format(*it, ctx); + ++it; + } + } + return out; + } +}; + +/** + Returns a view that formats the iterator range `[begin, end)` with elements + separated by `sep`. + */ +template +auto join(It begin, Sentinel end, string_view sep) -> join_view { + return {begin, end, sep}; +} + +/** + \rst + Returns a view that formats `range` with elements separated by `sep`. + + **Example**:: + + std::vector v = {1, 2, 3}; + fmt::print("{}", fmt::join(v, ", ")); + // Output: "1, 2, 3" + + ``fmt::join`` applies passed format specifiers to the range elements:: + + fmt::print("{:02}", fmt::join(v, ", ")); + // Output: "01, 02, 03" + \endrst + */ +template +auto join(Range&& range, string_view sep) + -> join_view, detail::sentinel_t> { + return join(std::begin(range), std::end(range), sep); +} + +/** + \rst + Converts *value* to ``std::string`` using the default format for type *T*. + + **Example**:: + + #include + + std::string answer = fmt::to_string(42); + \endrst + */ +template ::value && + !detail::has_format_as::value)> +inline auto to_string(const T& value) -> std::string { + auto buffer = memory_buffer(); + detail::write(appender(buffer), value); + return {buffer.data(), buffer.size()}; +} + +template ::value)> +FMT_NODISCARD inline auto to_string(T value) -> std::string { + // The buffer should be large enough to store the number including the sign + // or "false" for bool. + constexpr int max_size = detail::digits10() + 2; + char buffer[max_size > 5 ? static_cast(max_size) : 5]; + char* begin = buffer; + return std::string(begin, detail::write(begin, value)); +} + +template +FMT_NODISCARD auto to_string(const basic_memory_buffer& buf) + -> std::basic_string { + auto size = buf.size(); + detail::assume(size < std::basic_string().max_size()); + return std::basic_string(buf.data(), size); +} + +template ::value && + detail::has_format_as::value)> +inline auto to_string(const T& value) -> std::string { + return to_string(format_as(value)); +} + +FMT_END_EXPORT + +namespace detail { + +template +void vformat_to(buffer& buf, basic_string_view fmt, + typename vformat_args::type args, locale_ref loc) { + auto out = buffer_appender(buf); + if (fmt.size() == 2 && equal2(fmt.data(), "{}")) { + auto arg = args.get(0); + if (!arg) throw_format_error("argument not found"); + visit_format_arg(default_arg_formatter{out, args, loc}, arg); + return; + } + + struct format_handler : error_handler { + basic_format_parse_context parse_context; + buffer_context context; + + format_handler(buffer_appender p_out, basic_string_view str, + basic_format_args> p_args, + locale_ref p_loc) + : parse_context(str), context(p_out, p_args, p_loc) {} + + void on_text(const Char* begin, const Char* end) { + auto text = basic_string_view(begin, to_unsigned(end - begin)); + context.advance_to(write(context.out(), text)); + } + + FMT_CONSTEXPR auto on_arg_id() -> int { + return parse_context.next_arg_id(); + } + FMT_CONSTEXPR auto on_arg_id(int id) -> int { + return parse_context.check_arg_id(id), id; + } + FMT_CONSTEXPR auto on_arg_id(basic_string_view id) -> int { + int arg_id = context.arg_id(id); + if (arg_id < 0) throw_format_error("argument not found"); + return arg_id; + } + + FMT_INLINE void on_replacement_field(int id, const Char*) { + auto arg = get_arg(context, id); + context.advance_to(visit_format_arg( + default_arg_formatter{context.out(), context.args(), + context.locale()}, + arg)); + } + + auto on_format_specs(int id, const Char* begin, const Char* end) + -> const Char* { + auto arg = get_arg(context, id); + // Not using a visitor for custom types gives better codegen. + if (arg.format_custom(begin, parse_context, context)) + return parse_context.begin(); + auto specs = detail::dynamic_format_specs(); + begin = parse_format_specs(begin, end, specs, parse_context, arg.type()); + detail::handle_dynamic_spec( + specs.width, specs.width_ref, context); + detail::handle_dynamic_spec( + specs.precision, specs.precision_ref, context); + if (begin == end || *begin != '}') + throw_format_error("missing '}' in format string"); + auto f = arg_formatter{context.out(), specs, context.locale()}; + context.advance_to(visit_format_arg(f, arg)); + return begin; + } + }; + detail::parse_format_string(fmt, format_handler(out, fmt, args, loc)); +} + +FMT_BEGIN_EXPORT + +#ifndef FMT_HEADER_ONLY +extern template FMT_API void vformat_to(buffer&, string_view, + typename vformat_args<>::type, + locale_ref); +extern template FMT_API auto thousands_sep_impl(locale_ref) + -> thousands_sep_result; +extern template FMT_API auto thousands_sep_impl(locale_ref) + -> thousands_sep_result; +extern template FMT_API auto decimal_point_impl(locale_ref) -> char; +extern template FMT_API auto decimal_point_impl(locale_ref) -> wchar_t; +#endif // FMT_HEADER_ONLY + +} // namespace detail + +#if FMT_USE_USER_DEFINED_LITERALS +inline namespace literals { +/** + \rst + User-defined literal equivalent of :func:`fmt::arg`. + + **Example**:: + + using namespace fmt::literals; + fmt::print("Elapsed time: {s:.2f} seconds", "s"_a=1.23); + \endrst + */ +# if FMT_USE_NONTYPE_TEMPLATE_ARGS +template constexpr auto operator""_a() { + using char_t = remove_cvref_t; + return detail::udl_arg(); +} +# else +constexpr auto operator""_a(const char* s, size_t) -> detail::udl_arg { + return {s}; +} +# endif +} // namespace literals +#endif // FMT_USE_USER_DEFINED_LITERALS + +template ::value)> +inline auto vformat(const Locale& loc, string_view fmt, format_args args) + -> std::string { + return detail::vformat(loc, fmt, args); +} + +template ::value)> +inline auto format(const Locale& loc, format_string fmt, T&&... args) + -> std::string { + return fmt::vformat(loc, string_view(fmt), fmt::make_format_args(args...)); +} + +template ::value&& + detail::is_locale::value)> +auto vformat_to(OutputIt out, const Locale& loc, string_view fmt, + format_args args) -> OutputIt { + using detail::get_buffer; + auto&& buf = get_buffer(out); + detail::vformat_to(buf, fmt, args, detail::locale_ref(loc)); + return detail::get_iterator(buf, out); +} + +template ::value&& + detail::is_locale::value)> +FMT_INLINE auto format_to(OutputIt out, const Locale& loc, + format_string fmt, T&&... args) -> OutputIt { + return vformat_to(out, loc, fmt, fmt::make_format_args(args...)); +} + +template ::value)> +FMT_NODISCARD FMT_INLINE auto formatted_size(const Locale& loc, + format_string fmt, + T&&... args) -> size_t { + auto buf = detail::counting_buffer<>(); + detail::vformat_to(buf, fmt, fmt::make_format_args(args...), + detail::locale_ref(loc)); + return buf.count(); +} + +FMT_END_EXPORT + +template +template +FMT_CONSTEXPR FMT_INLINE auto +formatter::value != + detail::type::custom_type>>::format(const T& val, + FormatContext& ctx) + const -> decltype(ctx.out()) { + if (specs_.width_ref.kind == detail::arg_id_kind::none && + specs_.precision_ref.kind == detail::arg_id_kind::none) { + return detail::write(ctx.out(), val, specs_, ctx.locale()); + } + auto specs = specs_; + detail::handle_dynamic_spec(specs.width, + specs.width_ref, ctx); + detail::handle_dynamic_spec( + specs.precision, specs.precision_ref, ctx); + return detail::write(ctx.out(), val, specs, ctx.locale()); +} + +FMT_END_NAMESPACE + +#ifdef FMT_HEADER_ONLY +# define FMT_FUNC inline +# include "format-inl.h" +#else +# define FMT_FUNC +#endif + +#endif // FMT_FORMAT_H_ diff --git a/vm/math.cpp b/vm/math.cpp index ef56d265dc..0c612a55b8 100644 --- a/vm/math.cpp +++ b/vm/math.cpp @@ -3,6 +3,8 @@ #include #include +#include "fmt/format.h" + namespace factor { void factor_vm::primitive_bignum_to_fixnum() { @@ -227,23 +229,33 @@ void factor_vm::primitive_format_float() { ctx->replace(tag(array)); return; } - switch (format[0]) { - case 'f': localized_stream << std::fixed; break; - case 'e': localized_stream << std::scientific; break; - } - if (isupper(format[0])) { - localized_stream << std::uppercase; - } - if (fill[0] != '\0') { - localized_stream << std::setfill(fill[0]); - } - if (width >= 0) { - localized_stream << std::setw(static_cast(width)); - } - if (precision >= 0) { - localized_stream << std::setprecision(static_cast(precision)); + + if (format[0]) { + + switch (format[0]) { + case 'f': localized_stream << std::fixed; break; + case 'e': localized_stream << std::scientific; break; + } + if (isupper(format[0])) { + localized_stream << std::uppercase; + } + if (fill[0] != '\0') { + localized_stream << std::setfill(fill[0]); + } + if (width >= 0) { + localized_stream << std::setw(static_cast(width)); + } + if (precision >= 0) { + localized_stream << std::setprecision(static_cast(precision)); + } + + localized_stream << value; + + } else { + + localized_stream << fmt::format("{}", value); } - localized_stream << value; + const std::string& tmp = localized_stream.str(); const char* cstr = tmp.c_str(); size_t size = tmp.length();