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-rw-r--r--subprojects/fmt/include/fmt/format.h5500
1 files changed, 2866 insertions, 2634 deletions
diff --git a/subprojects/fmt/include/fmt/format.h b/subprojects/fmt/include/fmt/format.h
index 1a037b0..0bd2fdb 100644
--- a/subprojects/fmt/include/fmt/format.h
+++ b/subprojects/fmt/include/fmt/format.h
@@ -1,54 +1,56 @@
/*
- 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.
+ 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 <algorithm>
-#include <cerrno>
-#include <cmath>
-#include <cstdint>
-#include <limits>
-#include <memory>
-#include <stdexcept>
+#include <cmath> // std::signbit
+#include <cstdint> // uint32_t
+#include <cstring> // std::memcpy
+#include <limits> // std::numeric_limits
+#include <memory> // std::uninitialized_copy
+#include <stdexcept> // std::runtime_error
+#include <system_error> // std::system_error
+
+#ifdef __cpp_lib_bit_cast
+# include <bit> // std::bitcast
+#endif
#include "core.h"
-#ifdef __INTEL_COMPILER
-# define FMT_ICC_VERSION __INTEL_COMPILER
-#elif defined(__ICL)
-# define FMT_ICC_VERSION __ICL
+#if FMT_GCC_VERSION
+# define FMT_GCC_VISIBILITY_HIDDEN __attribute__((visibility("hidden")))
#else
-# define FMT_ICC_VERSION 0
+# define FMT_GCC_VISIBILITY_HIDDEN
#endif
#ifdef __NVCC__
@@ -69,35 +71,15 @@
# define FMT_NOINLINE
#endif
-#if __cplusplus == 201103L || __cplusplus == 201402L
-# if defined(__INTEL_COMPILER) || defined(__PGI)
-# define FMT_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
-#elif FMT_HAS_CPP17_ATTRIBUTE(fallthrough) || \
- (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
-# define FMT_FALLTHROUGH [[fallthrough]]
+#if FMT_MSC_VERSION
+# define FMT_MSC_DEFAULT = default
#else
-# define FMT_FALLTHROUGH
-#endif
-
-#ifndef FMT_MAYBE_UNUSED
-# if FMT_HAS_CPP17_ATTRIBUTE(maybe_unused)
-# define FMT_MAYBE_UNUSED [[maybe_unused]]
-# else
-# define FMT_MAYBE_UNUSED
-# endif
+# define FMT_MSC_DEFAULT
#endif
#ifndef FMT_THROW
# if FMT_EXCEPTIONS
-# if FMT_MSC_VER || FMT_NVCC
+# if FMT_MSC_VERSION || defined(__NVCC__)
FMT_BEGIN_NAMESPACE
namespace detail {
template <typename Exception> inline void do_throw(const Exception& x) {
@@ -113,10 +95,9 @@ FMT_END_NAMESPACE
# define FMT_THROW(x) throw x
# endif
# else
-# define FMT_THROW(x) \
- do { \
- static_cast<void>(sizeof(x)); \
- FMT_ASSERT(false, ""); \
+# define FMT_THROW(x) \
+ do { \
+ FMT_ASSERT(false, (x).what()); \
} while (false)
# endif
#endif
@@ -129,10 +110,18 @@ FMT_END_NAMESPACE
# 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.
# if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 407 || \
- FMT_MSC_VER >= 1900) && \
+ FMT_MSC_VERSION >= 1900) && \
(!defined(__EDG_VERSION__) || __EDG_VERSION__ >= /* UDL feature */ 480)
# define FMT_USE_USER_DEFINED_LITERALS 1
# else
@@ -140,89 +129,72 @@ FMT_END_NAMESPACE
# endif
#endif
-#ifndef FMT_USE_UDL_TEMPLATE
-// EDG frontend based compilers (icc, nvcc, PGI, etc) and GCC < 6.4 do not
-// properly support UDL templates and GCC >= 9 warns about them.
-# if FMT_USE_USER_DEFINED_LITERALS && \
- (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= 501) && \
- ((FMT_GCC_VERSION >= 604 && __cplusplus >= 201402L) || \
- FMT_CLANG_VERSION >= 304) && \
- !defined(__PGI) && !defined(__NVCC__)
-# define FMT_USE_UDL_TEMPLATE 1
-# else
-# define FMT_USE_UDL_TEMPLATE 0
-# endif
-#endif
-
-#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
-
// Defining FMT_REDUCE_INT_INSTANTIATIONS to 1, will reduce the number of
-// int_writer template instances 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.
+// 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_GCC_VERSION || FMT_HAS_BUILTIN(__builtin_clz)) && !FMT_MSC_VER
-# define FMT_BUILTIN_CLZ(n) __builtin_clz(n)
-#endif
-#if (FMT_GCC_VERSION || FMT_HAS_BUILTIN(__builtin_clzll)) && !FMT_MSC_VER
-# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
-#endif
-#if (FMT_GCC_VERSION || FMT_HAS_BUILTIN(__builtin_ctz))
-# define FMT_BUILTIN_CTZ(n) __builtin_ctz(n)
+// 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
-#if (FMT_GCC_VERSION || FMT_HAS_BUILTIN(__builtin_ctzll))
-# define FMT_BUILTIN_CTZLL(n) __builtin_ctzll(n)
+
+// __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_VER
+#if FMT_MSC_VERSION
# include <intrin.h> // _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_VER && !defined(FMT_BUILTIN_CLZLL) && \
- !defined(FMT_BUILTIN_CTZLL) && !defined(_MANAGED)
+#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.
-# ifndef __clang__
+# if !defined(__clang__)
# pragma intrinsic(_BitScanForward)
# pragma intrinsic(_BitScanReverse)
-# endif
-# if defined(_WIN64) && !defined(__clang__)
-# pragma intrinsic(_BitScanForward64)
-# pragma intrinsic(_BitScanReverse64)
+# if defined(_WIN64)
+# pragma intrinsic(_BitScanForward64)
+# pragma intrinsic(_BitScanReverse64)
+# endif
# endif
-inline int clz(uint32_t x) {
+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_SUPPRESS_MSC_WARNING(6102)
+ FMT_MSC_WARNING(suppress : 6102)
return 31 ^ static_cast<int>(r);
}
# define FMT_BUILTIN_CLZ(n) detail::clz(n)
-inline int clzll(uint64_t x) {
+inline auto clzll(uint64_t x) -> int {
unsigned long r = 0;
# ifdef _WIN64
_BitScanReverse64(&r, x);
@@ -233,24 +205,24 @@ inline int clzll(uint64_t x) {
_BitScanReverse(&r, static_cast<uint32_t>(x));
# endif
FMT_ASSERT(x != 0, "");
- FMT_SUPPRESS_MSC_WARNING(6102) // Suppress a bogus static analysis warning.
+ FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
return 63 ^ static_cast<int>(r);
}
# define FMT_BUILTIN_CLZLL(n) detail::clzll(n)
-inline int ctz(uint32_t x) {
+inline auto ctz(uint32_t x) -> int {
unsigned long r = 0;
_BitScanForward(&r, x);
FMT_ASSERT(x != 0, "");
- FMT_SUPPRESS_MSC_WARNING(6102) // Suppress a bogus static analysis warning.
+ FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
return static_cast<int>(r);
}
# define FMT_BUILTIN_CTZ(n) detail::ctz(n)
-inline int ctzll(uint64_t x) {
+inline auto ctzll(uint64_t x) -> int {
unsigned long r = 0;
FMT_ASSERT(x != 0, "");
- FMT_SUPPRESS_MSC_WARNING(6102) // Suppress a bogus static analysis warning.
+ FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
# ifdef _WIN64
_BitScanForward64(&r, x);
# else
@@ -267,75 +239,218 @@ inline int ctzll(uint64_t x) {
FMT_END_NAMESPACE
#endif
-// Enable the deprecated numeric alignment.
-#ifndef FMT_DEPRECATED_NUMERIC_ALIGN
-# define FMT_DEPRECATED_NUMERIC_ALIGN 0
-#endif
-
FMT_BEGIN_NAMESPACE
namespace detail {
-// An equivalent of `*reinterpret_cast<Dest*>(&source)` that doesn't have
-// undefined behavior (e.g. due to type aliasing).
-// Example: uint64_t d = bit_cast<uint64_t>(2.718);
-template <typename Dest, typename Source>
-inline Dest bit_cast(const Source& source) {
- static_assert(sizeof(Dest) == sizeof(Source), "size mismatch");
- Dest dest;
- std::memcpy(&dest, &source, sizeof(dest));
- return dest;
+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
}
-inline bool is_big_endian() {
- const auto u = 1u;
+template <typename Streambuf> class formatbuf : public Streambuf {
+ private:
+ using char_type = typename Streambuf::char_type;
+ using streamsize = decltype(std::declval<Streambuf>().sputn(nullptr, 0));
+ using int_type = typename Streambuf::int_type;
+ using traits_type = typename Streambuf::traits_type;
+
+ buffer<char_type>& buffer_;
+
+ public:
+ explicit formatbuf(buffer<char_type>& buf) : buffer_(buf) {}
+
+ protected:
+ // The put area is always empty. This makes the implementation simpler and has
+ // the advantage that the streambuf and the buffer are always in sync and
+ // sputc never writes into uninitialized memory. A disadvantage is that each
+ // call to sputc always results in a (virtual) call to overflow. There is no
+ // disadvantage here for sputn since this always results in a call to xsputn.
+
+ auto overflow(int_type ch) -> int_type override {
+ if (!traits_type::eq_int_type(ch, traits_type::eof()))
+ buffer_.push_back(static_cast<char_type>(ch));
+ return ch;
+ }
+
+ auto xsputn(const char_type* s, streamsize count) -> streamsize override {
+ buffer_.append(s, s + count);
+ return count;
+ }
+};
+
+// Implementation of std::bit_cast for pre-C++20.
+template <typename To, typename From, FMT_ENABLE_IF(sizeof(To) == sizeof(From))>
+FMT_CONSTEXPR20 auto bit_cast(const From& from) -> To {
+#ifdef __cpp_lib_bit_cast
+ if (is_constant_evaluated()) return std::bit_cast<To>(from);
+#endif
+ auto to = To();
+ std::memcpy(&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(u)];
+ char data[sizeof(int)];
};
- return bit_cast<bytes>(u).data[0] == 0;
+ return bit_cast<bytes>(1).data[0] == 0;
+#endif
}
-// A fallback implementation of uintptr_t for systems that lack it.
-struct fallback_uintptr {
- unsigned char value[sizeof(void*)];
+class uint128_fallback {
+ private:
+ uint64_t lo_, hi_;
+
+ friend uint128_fallback umul128(uint64_t x, uint64_t y) noexcept;
- fallback_uintptr() = default;
- explicit fallback_uintptr(const void* p) {
- *this = bit_cast<fallback_uintptr>(p);
- if (is_big_endian()) {
- for (size_t i = 0, j = sizeof(void*) - 1; i < j; ++i, --j)
- std::swap(value[i], value[j]);
+ 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 uint64_t high() const noexcept { return hi_; }
+ constexpr uint64_t low() const noexcept { return lo_; }
+
+ template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
+ constexpr explicit operator T() const {
+ return static_cast<T>(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 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_};
+ return {hi_ >> shift, (hi_ << (64 - shift)) | (lo_ >> shift)};
+ }
+ FMT_CONSTEXPR auto operator<<(int shift) const -> uint128_fallback {
+ if (shift == 64) return {lo_, 0};
+ 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_CONSTEXPR20 uint128_fallback& operator+=(uint64_t n) noexcept {
+ if (is_constant_evaluated()) {
+ lo_ += n;
+ hi_ += (lo_ < n ? 1 : 0);
+ return *this;
}
+#if FMT_HAS_BUILTIN(__builtin_addcll)
+ unsigned long long carry;
+ lo_ = __builtin_addcll(lo_, n, 0, &carry);
+ hi_ += carry;
+#elif FMT_HAS_BUILTIN(__builtin_ia32_addcarryx_u64)
+ 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<FMT_USE_INT128, uint128_opt, uint128_fallback>;
+
#ifdef UINTPTR_MAX
using uintptr_t = ::uintptr_t;
-inline uintptr_t to_uintptr(const void* p) { return bit_cast<uintptr_t>(p); }
#else
-using uintptr_t = fallback_uintptr;
-inline fallback_uintptr to_uintptr(const void* p) {
- return fallback_uintptr(p);
-}
+using uintptr_t = uint128_t;
#endif
// Returns the largest possible value for type T. Same as
// std::numeric_limits<T>::max() but shorter and not affected by the max macro.
-template <typename T> constexpr T max_value() {
+template <typename T> constexpr auto max_value() -> T {
return (std::numeric_limits<T>::max)();
}
-template <typename T> constexpr int num_bits() {
+template <typename T> constexpr auto num_bits() -> int {
return std::numeric_limits<T>::digits;
}
// std::numeric_limits<T>::digits may return 0 for 128-bit ints.
-template <> constexpr int num_bits<int128_t>() { return 128; }
-template <> constexpr int num_bits<uint128_t>() { return 128; }
-template <> constexpr int num_bits<fallback_uintptr>() {
- return static_cast<int>(sizeof(void*) *
- std::numeric_limits<unsigned char>::digits);
+template <> constexpr auto num_bits<int128_opt>() -> int { return 128; }
+template <> constexpr auto num_bits<uint128_t>() -> 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 <typename To, typename From, FMT_ENABLE_IF(sizeof(To) > sizeof(From))>
+inline auto bit_cast(const From& from) -> To {
+ constexpr auto size = static_cast<int>(sizeof(From) / sizeof(unsigned));
+ struct data_t {
+ unsigned value[static_cast<unsigned>(size)];
+ } data = bit_cast<data_t>(from);
+ auto result = To();
+ if (const_check(is_big_endian())) {
+ for (int i = 0; i < size; ++i)
+ result = (result << num_bits<unsigned>()) | data.value[i];
+ } else {
+ for (int i = size - 1; i >= 0; --i)
+ result = (result << num_bits<unsigned>()) | data.value[i];
+ }
+ return result;
}
FMT_INLINE void assume(bool condition) {
(void)condition;
-#if FMT_HAS_BUILTIN(__builtin_assume)
+#if FMT_HAS_BUILTIN(__builtin_assume) && !FMT_ICC_VERSION
__builtin_assume(condition);
#endif
}
@@ -346,31 +461,38 @@ using iterator_t = decltype(std::begin(std::declval<T&>()));
template <typename T> using sentinel_t = decltype(std::end(std::declval<T&>()));
// A workaround for std::string not having mutable data() until C++17.
-template <typename Char> inline Char* get_data(std::basic_string<Char>& s) {
+template <typename Char>
+inline auto get_data(std::basic_string<Char>& s) -> Char* {
return &s[0];
}
template <typename Container>
-inline typename Container::value_type* get_data(Container& c) {
+inline auto get_data(Container& c) -> typename Container::value_type* {
return c.data();
}
#if defined(_SECURE_SCL) && _SECURE_SCL
// Make a checked iterator to avoid MSVC warnings.
template <typename T> using checked_ptr = stdext::checked_array_iterator<T*>;
-template <typename T> checked_ptr<T> make_checked(T* p, size_t size) {
+template <typename T>
+constexpr auto make_checked(T* p, size_t size) -> checked_ptr<T> {
return {p, size};
}
#else
template <typename T> using checked_ptr = T*;
-template <typename T> inline T* make_checked(T* p, size_t) { return p; }
+template <typename T> constexpr auto make_checked(T* p, size_t) -> T* {
+ return p;
+}
#endif
+// 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 <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)>
-#if FMT_CLANG_VERSION
+#if FMT_CLANG_VERSION >= 307 && !FMT_ICC_VERSION
__attribute__((no_sanitize("undefined")))
#endif
-inline checked_ptr<typename Container::value_type>
-reserve(std::back_insert_iterator<Container> it, size_t n) {
+inline auto
+reserve(std::back_insert_iterator<Container> it, size_t n)
+ -> checked_ptr<typename Container::value_type> {
Container& c = get_container(it);
size_t size = c.size();
c.resize(size + n);
@@ -378,21 +500,26 @@ reserve(std::back_insert_iterator<Container> it, size_t n) {
}
template <typename T>
-inline buffer_appender<T> reserve(buffer_appender<T> it, size_t n) {
+inline auto reserve(buffer_appender<T> it, size_t n) -> buffer_appender<T> {
buffer<T>& buf = get_container(it);
buf.try_reserve(buf.size() + n);
return it;
}
-template <typename Iterator> inline Iterator& reserve(Iterator& it, size_t) {
+template <typename Iterator>
+constexpr auto reserve(Iterator& it, size_t) -> Iterator& {
return it;
}
+template <typename OutputIt>
+using reserve_iterator =
+ remove_reference_t<decltype(reserve(std::declval<OutputIt&>(), 0))>;
+
template <typename T, typename OutputIt>
-constexpr T* to_pointer(OutputIt, size_t) {
+constexpr auto to_pointer(OutputIt, size_t) -> T* {
return nullptr;
}
-template <typename T> T* to_pointer(buffer_appender<T> it, size_t n) {
+template <typename T> auto to_pointer(buffer_appender<T> it, size_t n) -> T* {
buffer<T>& buf = get_container(it);
auto size = buf.size();
if (buf.capacity() < size + n) return nullptr;
@@ -401,195 +528,221 @@ template <typename T> T* to_pointer(buffer_appender<T> it, size_t n) {
}
template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)>
-inline std::back_insert_iterator<Container> base_iterator(
- std::back_insert_iterator<Container>& it,
- checked_ptr<typename Container::value_type>) {
+inline auto base_iterator(std::back_insert_iterator<Container>& it,
+ checked_ptr<typename Container::value_type>)
+ -> std::back_insert_iterator<Container> {
return it;
}
template <typename Iterator>
-inline Iterator base_iterator(Iterator, Iterator it) {
+constexpr auto base_iterator(Iterator, Iterator it) -> Iterator {
return it;
}
-// 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;
- using _Unchecked_type = counting_iterator; // Mark iterator as checked.
-
- struct value_type {
- template <typename T> void operator=(const T&) {}
- };
-
- counting_iterator() : count_(0) {}
-
- size_t count() const { return count_; }
-
- counting_iterator& operator++() {
- ++count_;
- return *this;
- }
- counting_iterator operator++(int) {
- auto it = *this;
- ++*this;
- return it;
- }
-
- friend counting_iterator operator+(counting_iterator it, difference_type n) {
- it.count_ += static_cast<size_t>(n);
- return it;
- }
-
- value_type operator*() const { return {}; }
-};
-
-template <typename OutputIt> class truncating_iterator_base {
- protected:
- OutputIt out_;
- size_t limit_;
- size_t count_;
-
- truncating_iterator_base(OutputIt out, size_t limit)
- : out_(out), limit_(limit), count_(0) {}
-
- public:
- using iterator_category = std::output_iterator_tag;
- using value_type = typename std::iterator_traits<OutputIt>::value_type;
- using difference_type = void;
- using pointer = void;
- using reference = void;
- using _Unchecked_type =
- truncating_iterator_base; // Mark iterator as checked.
-
- OutputIt base() const { return out_; }
- size_t count() const { return count_; }
-};
-
-// An output iterator that truncates the output and counts the number of objects
-// written to it.
-template <typename OutputIt,
- typename Enable = typename std::is_void<
- typename std::iterator_traits<OutputIt>::value_type>::type>
-class truncating_iterator;
-
-template <typename OutputIt>
-class truncating_iterator<OutputIt, std::false_type>
- : public truncating_iterator_base<OutputIt> {
- mutable typename truncating_iterator_base<OutputIt>::value_type blackhole_;
-
- public:
- using value_type = typename truncating_iterator_base<OutputIt>::value_type;
-
- truncating_iterator(OutputIt out, size_t limit)
- : truncating_iterator_base<OutputIt>(out, limit) {}
-
- truncating_iterator& operator++() {
- if (this->count_++ < this->limit_) ++this->out_;
- return *this;
+// <algorithm> is spectacularly slow to compile in C++20 so use a simple fill_n
+// instead (#1998).
+template <typename OutputIt, typename Size, typename T>
+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 <typename T, typename Size>
+FMT_CONSTEXPR20 auto fill_n(T* out, Size count, char value) -> T* {
+ if (is_constant_evaluated()) {
+ return fill_n<T*, Size, T>(out, count, value);
}
+ std::memset(out, value, to_unsigned(count));
+ return out + count;
+}
- truncating_iterator operator++(int) {
- auto it = *this;
- ++*this;
- return it;
- }
+#ifdef __cpp_char8_t
+using char8_type = char8_t;
+#else
+enum char8_type : unsigned char {};
+#endif
- value_type& operator*() const {
- return this->count_ < this->limit_ ? *this->out_ : blackhole_;
+template <typename OutChar, typename InputIt, typename OutputIt>
+FMT_CONSTEXPR FMT_NOINLINE auto copy_str_noinline(InputIt begin, InputIt end,
+ OutputIt out) -> OutputIt {
+ return copy_str<OutChar>(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 = code_point_length(s);
+ const char* next = s + len;
+
+ // Assume a four-byte character and load four bytes. Unused bits are
+ // shifted out.
+ *c = uint32_t(s[0] & masks[len]) << 18;
+ *c |= uint32_t(s[1] & 0x3f) << 12;
+ *c |= uint32_t(s[2] & 0x3f) << 6;
+ *c |= uint32_t(s[3] & 0x3f) << 0;
+ *c >>= shiftc[len];
+
+ // Accumulate the various error conditions.
+ using uchar = unsigned char;
+ *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 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 <typename F>
+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, to_unsigned(end - buf_ptr)));
+ return result ? 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;
+ }
}
-};
-
-template <typename OutputIt>
-class truncating_iterator<OutputIt, std::true_type>
- : public truncating_iterator_base<OutputIt> {
- public:
- truncating_iterator(OutputIt out, size_t limit)
- : truncating_iterator_base<OutputIt>(out, limit) {}
-
- template <typename T> truncating_iterator& operator=(T val) {
- if (this->count_++ < this->limit_) *this->out_++ = val;
- return *this;
+ if (auto num_chars_left = s.data() + s.size() - p) {
+ char buf[2 * block_size - 1] = {};
+ copy_str<char>(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);
}
-
- truncating_iterator& operator++() { return *this; }
- truncating_iterator& operator++(int) { return *this; }
- truncating_iterator& operator*() { return *this; }
-};
+}
template <typename Char>
-inline size_t count_code_points(basic_string_view<Char> s) {
+inline auto compute_width(basic_string_view<Char> s) -> size_t {
return s.size();
}
-// Counts the number of code points in a UTF-8 string.
-inline size_t count_code_points(basic_string_view<char> s) {
- const char* data = s.data();
+// Computes approximate display width of a UTF-8 string.
+FMT_CONSTEXPR inline size_t compute_width(string_view s) {
size_t num_code_points = 0;
- for (size_t i = 0, size = s.size(); i != size; ++i) {
- if ((data[i] & 0xc0) != 0x80) ++num_code_points;
- }
+ // 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;
+ }
+ };
+ for_each_codepoint(s, count_code_points{&num_code_points});
return num_code_points;
}
-inline size_t count_code_points(basic_string_view<char8_type> s) {
- return count_code_points(basic_string_view<char>(
- reinterpret_cast<const char*>(s.data()), s.size()));
+inline auto compute_width(basic_string_view<char8_type> s) -> size_t {
+ return compute_width(
+ string_view(reinterpret_cast<const char*>(s.data()), s.size()));
}
template <typename Char>
-inline size_t code_point_index(basic_string_view<Char> s, size_t n) {
+inline auto code_point_index(basic_string_view<Char> 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 size_t code_point_index(basic_string_view<char8_type> s, size_t n) {
- const char8_type* data = s.data();
+inline auto code_point_index(string_view s, size_t n) -> size_t {
+ const char* data = s.data();
size_t num_code_points = 0;
for (size_t i = 0, size = s.size(); i != size; ++i) {
- if ((data[i] & 0xc0) != 0x80 && ++num_code_points > n) {
- return i;
- }
+ if ((data[i] & 0xc0) != 0x80 && ++num_code_points > n) return i;
}
return s.size();
}
-template <typename InputIt, typename OutChar>
-using needs_conversion = bool_constant<
- std::is_same<typename std::iterator_traits<InputIt>::value_type,
- char>::value &&
- std::is_same<OutChar, char8_type>::value>;
-
-template <typename OutChar, typename InputIt, typename OutputIt,
- FMT_ENABLE_IF(!needs_conversion<InputIt, OutChar>::value)>
-OutputIt copy_str(InputIt begin, InputIt end, OutputIt it) {
- return std::copy(begin, end, it);
+inline auto code_point_index(basic_string_view<char8_type> s, size_t n)
+ -> size_t {
+ return code_point_index(
+ string_view(reinterpret_cast<const char*>(s.data()), s.size()), n);
}
-template <typename OutChar, typename InputIt, typename OutputIt,
- FMT_ENABLE_IF(needs_conversion<InputIt, OutChar>::value)>
-OutputIt copy_str(InputIt begin, InputIt end, OutputIt it) {
- return std::transform(begin, end, it,
- [](char c) { return static_cast<char8_type>(c); });
-}
+#ifndef FMT_USE_FLOAT128
+# ifdef __SIZEOF_FLOAT128__
+# define FMT_USE_FLOAT128 1
+# else
+# define FMT_USE_FLOAT128 0
+# endif
+#endif
+#if FMT_USE_FLOAT128
+using float128 = __float128;
+#else
+using float128 = void;
+#endif
+template <typename T> using is_float128 = std::is_same<T, float128>;
-template <typename Char, typename InputIt>
-inline counting_iterator copy_str(InputIt begin, InputIt end,
- counting_iterator it) {
- return it + (end - begin);
-}
+template <typename T>
+using is_floating_point =
+ bool_constant<std::is_floating_point<T>::value || is_float128<T>::value>;
+
+template <typename T, bool = std::is_floating_point<T>::value>
+struct is_fast_float : bool_constant<std::numeric_limits<T>::is_iec559 &&
+ sizeof(T) <= sizeof(double)> {};
+template <typename T> struct is_fast_float<T, false> : std::false_type {};
template <typename T>
-using is_fast_float = bool_constant<std::numeric_limits<T>::is_iec559 &&
- sizeof(T) <= sizeof(double)>;
+using is_double_double = bool_constant<std::numeric_limits<T>::digits == 106>;
#ifndef FMT_USE_FULL_CACHE_DRAGONBOX
# define FMT_USE_FULL_CACHE_DRAGONBOX 0
@@ -598,7 +751,7 @@ using is_fast_float = bool_constant<std::numeric_limits<T>::is_iec559 &&
template <typename T>
template <typename U>
void buffer<T>::append(const U* begin, const U* end) {
- do {
+ while (begin != end) {
auto count = to_unsigned(end - begin);
try_reserve(size_ + count);
auto free_cap = capacity_ - size_;
@@ -606,16 +759,17 @@ void buffer<T>::append(const U* begin, const U* end) {
std::uninitialized_copy_n(begin, count, make_checked(ptr_ + size_, count));
size_ += count;
begin += count;
- } while (begin != end);
+ }
}
-template <typename OutputIt, typename T, typename Traits>
-void iterator_buffer<OutputIt, T, Traits>::flush() {
- out_ = std::copy_n(data_, this->limit(this->size()), out_);
- this->clear();
-}
+template <typename T, typename Enable = void>
+struct is_locale : std::false_type {};
+template <typename T>
+struct is_locale<T, void_t<decltype(T::classic())>> : std::true_type {};
} // namespace detail
+FMT_MODULE_EXPORT_BEGIN
+
// The number of characters to store in the basic_memory_buffer object itself
// to avoid dynamic memory allocation.
enum { inline_buffer_size = 500 };
@@ -625,20 +779,12 @@ enum { inline_buffer_size = 500 };
A dynamically growing memory buffer for trivially copyable/constructible types
with the first ``SIZE`` elements stored in the object itself.
- You can use one of the following type aliases for common character types:
-
- +----------------+------------------------------+
- | Type | Definition |
- +================+==============================+
- | memory_buffer | basic_memory_buffer<char> |
- +----------------+------------------------------+
- | wmemory_buffer | basic_memory_buffer<wchar_t> |
- +----------------+------------------------------+
+ You can use the ``memory_buffer`` type alias for ``char`` instead.
**Example**::
- fmt::memory_buffer out;
- format_to(out, "The answer is {}.", 42);
+ auto out = fmt::memory_buffer();
+ format_to(std::back_inserter(out), "The answer is {}.", 42);
This will append the following output to the ``out`` object:
@@ -659,39 +805,42 @@ class basic_memory_buffer final : public detail::buffer<T> {
Allocator alloc_;
// Deallocate memory allocated by the buffer.
- void deallocate() {
+ FMT_CONSTEXPR20 void deallocate() {
T* data = this->data();
if (data != store_) alloc_.deallocate(data, this->capacity());
}
protected:
- void grow(size_t size) final FMT_OVERRIDE;
+ FMT_CONSTEXPR20 void grow(size_t size) override;
public:
using value_type = T;
using const_reference = const T&;
- explicit basic_memory_buffer(const Allocator& alloc = Allocator())
+ 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());
}
- ~basic_memory_buffer() { deallocate(); }
+ FMT_CONSTEXPR20 ~basic_memory_buffer() { deallocate(); }
private:
// Move data from other to this buffer.
- void move(basic_memory_buffer& other) {
+ 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);
- std::uninitialized_copy(other.store_, other.store_ + size,
- detail::make_checked(store_, capacity));
+ detail::copy_str<T>(other.store_, other.store_ + size,
+ detail::make_checked(store_, capacity));
} 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);
}
@@ -703,14 +852,16 @@ class basic_memory_buffer final : public detail::buffer<T> {
of the other object to it.
\endrst
*/
- basic_memory_buffer(basic_memory_buffer&& other) FMT_NOEXCEPT { move(other); }
+ 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
*/
- basic_memory_buffer& operator=(basic_memory_buffer&& other) FMT_NOEXCEPT {
+ auto operator=(basic_memory_buffer&& other) noexcept -> basic_memory_buffer& {
FMT_ASSERT(this != &other, "");
deallocate();
move(other);
@@ -718,13 +869,13 @@ class basic_memory_buffer final : public detail::buffer<T> {
}
// Returns a copy of the allocator associated with this buffer.
- Allocator get_allocator() const { return alloc_; }
+ 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.
*/
- void resize(size_t count) { this->try_resize(count); }
+ 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); }
@@ -738,13 +889,16 @@ class basic_memory_buffer final : public detail::buffer<T> {
};
template <typename T, size_t SIZE, typename Allocator>
-void basic_memory_buffer<T, SIZE, Allocator>::grow(size_t size) {
-#ifdef FMT_FUZZ
- if (size > 5000) throw std::runtime_error("fuzz mode - won't grow that much");
-#endif
+FMT_CONSTEXPR20 void basic_memory_buffer<T, SIZE, Allocator>::grow(
+ size_t size) {
+ detail::abort_fuzzing_if(size > 5000);
+ const size_t max_size = std::allocator_traits<Allocator>::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;
+ 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<Allocator>::allocate(alloc_, new_capacity);
@@ -759,12 +913,15 @@ void basic_memory_buffer<T, SIZE, Allocator>::grow(size_t size) {
}
using memory_buffer = basic_memory_buffer<char>;
-using wmemory_buffer = basic_memory_buffer<wchar_t>;
template <typename T, size_t SIZE, typename Allocator>
struct is_contiguous<basic_memory_buffer<T, SIZE, Allocator>> : std::true_type {
};
+namespace detail {
+FMT_API void print(std::FILE*, string_view);
+}
+
/** A formatting error such as invalid format string. */
FMT_CLASS_API
class FMT_API format_error : public std::runtime_error {
@@ -776,32 +933,63 @@ class FMT_API format_error : public std::runtime_error {
format_error& operator=(const format_error&) = default;
format_error(format_error&&) = default;
format_error& operator=(format_error&&) = default;
- ~format_error() FMT_NOEXCEPT FMT_OVERRIDE;
+ ~format_error() noexcept override FMT_MSC_DEFAULT;
};
-namespace detail {
+namespace detail_exported {
+#if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <typename Char, size_t N> struct fixed_string {
+ constexpr fixed_string(const Char (&str)[N]) {
+ detail::copy_str<Char, const Char*, Char*>(static_cast<const Char*>(str),
+ str + N, data);
+ }
+ Char data[N] = {};
+};
+#endif
+
+// Converts a compile-time string to basic_string_view.
+template <typename Char, size_t N>
+constexpr auto compile_string_to_view(const Char (&s)[N])
+ -> basic_string_view<Char> {
+ // 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<Char>::to_int_type(s[N - 1]) == 0 ? 1 : 0)};
+}
+template <typename Char>
+constexpr auto compile_string_to_view(detail::std_string_view<Char> s)
+ -> basic_string_view<Char> {
+ return {s.data(), s.size()};
+}
+} // namespace detail_exported
+
+FMT_BEGIN_DETAIL_NAMESPACE
+
+template <typename T> struct is_integral : std::is_integral<T> {};
+template <> struct is_integral<int128_opt> : std::true_type {};
+template <> struct is_integral<uint128_t> : std::true_type {};
template <typename T>
using is_signed =
std::integral_constant<bool, std::numeric_limits<T>::is_signed ||
- std::is_same<T, int128_t>::value>;
+ std::is_same<T, int128_opt>::value>;
// Returns true if value is negative, false otherwise.
// Same as `value < 0` but doesn't produce warnings if T is an unsigned type.
template <typename T, FMT_ENABLE_IF(is_signed<T>::value)>
-FMT_CONSTEXPR bool is_negative(T value) {
+constexpr auto is_negative(T value) -> bool {
return value < 0;
}
template <typename T, FMT_ENABLE_IF(!is_signed<T>::value)>
-FMT_CONSTEXPR bool is_negative(T) {
+constexpr auto is_negative(T) -> bool {
return false;
}
-template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
-FMT_CONSTEXPR bool is_supported_floating_point(T) {
- return (std::is_same<T, float>::value && FMT_USE_FLOAT) ||
- (std::is_same<T, double>::value && FMT_USE_DOUBLE) ||
- (std::is_same<T, long double>::value && FMT_USE_LONG_DOUBLE);
+template <typename T>
+FMT_CONSTEXPR auto is_supported_floating_point(T) -> bool {
+ if (std::is_same<T, float>()) return FMT_USE_FLOAT;
+ if (std::is_same<T, double>()) return FMT_USE_DOUBLE;
+ if (std::is_same<T, long double>()) return FMT_USE_LONG_DOUBLE;
+ return true;
}
// Smallest of uint32_t, uint64_t, uint128_t that is large enough to
@@ -811,121 +999,33 @@ using uint32_or_64_or_128_t =
conditional_t<num_bits<T>() <= 32 && !FMT_REDUCE_INT_INSTANTIATIONS,
uint32_t,
conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>>;
-
-// 128-bit integer type used internally
-struct FMT_EXTERN_TEMPLATE_API uint128_wrapper {
- uint128_wrapper() = default;
-
-#if FMT_USE_INT128
- uint128_t internal_;
-
- uint128_wrapper(uint64_t high, uint64_t low) FMT_NOEXCEPT
- : internal_{static_cast<uint128_t>(low) |
- (static_cast<uint128_t>(high) << 64)} {}
-
- uint128_wrapper(uint128_t u) : internal_{u} {}
-
- uint64_t high() const FMT_NOEXCEPT { return uint64_t(internal_ >> 64); }
- uint64_t low() const FMT_NOEXCEPT { return uint64_t(internal_); }
-
- uint128_wrapper& operator+=(uint64_t n) FMT_NOEXCEPT {
- internal_ += n;
- return *this;
- }
-#else
- uint64_t high_;
- uint64_t low_;
-
- uint128_wrapper(uint64_t high, uint64_t low) FMT_NOEXCEPT : high_{high},
- low_{low} {}
-
- uint64_t high() const FMT_NOEXCEPT { return high_; }
- uint64_t low() const FMT_NOEXCEPT { return low_; }
-
- uint128_wrapper& operator+=(uint64_t n) FMT_NOEXCEPT {
-# if defined(_MSC_VER) && defined(_M_X64)
- unsigned char carry = _addcarry_u64(0, low_, n, &low_);
- _addcarry_u64(carry, high_, 0, &high_);
- return *this;
-# else
- uint64_t sum = low_ + n;
- high_ += (sum < low_ ? 1 : 0);
- low_ = sum;
- return *this;
-# endif
- }
-#endif
-};
-
-// Table entry type for divisibility test used internally
-template <typename T> struct FMT_EXTERN_TEMPLATE_API divtest_table_entry {
- T mod_inv;
- T max_quotient;
-};
-
-// Static data is placed in this class template for the header-only config.
-template <typename T = void> struct FMT_EXTERN_TEMPLATE_API basic_data {
- static const uint64_t powers_of_10_64[];
- static const uint32_t zero_or_powers_of_10_32_new[];
- static const uint64_t zero_or_powers_of_10_64_new[];
- static const uint64_t grisu_pow10_significands[];
- static const int16_t grisu_pow10_exponents[];
- static const divtest_table_entry<uint32_t> divtest_table_for_pow5_32[];
- static const divtest_table_entry<uint64_t> divtest_table_for_pow5_64[];
- static const uint64_t dragonbox_pow10_significands_64[];
- static const uint128_wrapper dragonbox_pow10_significands_128[];
- // log10(2) = 0x0.4d104d427de7fbcc...
- static const uint64_t log10_2_significand = 0x4d104d427de7fbcc;
-#if !FMT_USE_FULL_CACHE_DRAGONBOX
- static const uint64_t powers_of_5_64[];
- static const uint32_t dragonbox_pow10_recovery_errors[];
+template <typename T>
+using uint64_or_128_t = conditional_t<num_bits<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 const char* digits2(size_t value) {
+ // 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 <typename Char, typename Sign> constexpr Char sign(Sign s) {
+#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 604
+ static_assert(std::is_same<Sign, sign_t>::value, "");
#endif
- // GCC generates slightly better code for pairs than chars.
- using digit_pair = char[2];
- static const digit_pair digits[];
- static const char hex_digits[];
- static const char foreground_color[];
- static const char background_color[];
- static const char reset_color[5];
- static const wchar_t wreset_color[5];
- static const char signs[];
- static const char left_padding_shifts[5];
- static const char right_padding_shifts[5];
-
- // DEPRECATED! These are for ABI compatibility.
- static const uint32_t zero_or_powers_of_10_32[];
- static const uint64_t zero_or_powers_of_10_64[];
-};
-
-// Maps bsr(n) to ceil(log10(pow(2, bsr(n) + 1) - 1)).
-// This is a function instead of an array to workaround a bug in GCC10 (#1810).
-FMT_INLINE uint16_t bsr2log10(int bsr) {
- static constexpr uint16_t data[] = {
- 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};
- return data[bsr];
+ return static_cast<Char>("\0-+ "[s]);
}
-#ifndef FMT_EXPORTED
-FMT_EXTERN template struct basic_data<void>;
-#endif
-
-// This is a struct rather than an alias to avoid shadowing warnings in gcc.
-struct data : basic_data<> {};
-
-#ifdef FMT_BUILTIN_CLZLL
-// Returns the number of decimal digits in n. Leading zeros are not counted
-// except for n == 0 in which case count_digits returns 1.
-inline int count_digits(uint64_t n) {
- // https://github.com/fmtlib/format-benchmark/blob/master/digits10
- auto t = bsr2log10(FMT_BUILTIN_CLZLL(n | 1) ^ 63);
- return t - (n < data::zero_or_powers_of_10_64_new[t]);
-}
-#else
-// Fallback version of count_digits used when __builtin_clz is not available.
-inline int count_digits(uint64_t n) {
+template <typename T> 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
@@ -939,103 +1039,146 @@ inline int count_digits(uint64_t n) {
count += 4;
}
}
-#endif
-
#if FMT_USE_INT128
-inline int count_digits(uint128_t n) {
- 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;
- }
+FMT_CONSTEXPR inline auto count_digits(uint128_opt n) -> int {
+ return count_digits_fallback(n);
}
#endif
-// Counts the number of digits in n. BITS = log2(radix).
-template <unsigned BITS, typename UInt> inline int count_digits(UInt n) {
- int num_digits = 0;
- do {
- ++num_digits;
- } while ((n >>= BITS) != 0);
- return num_digits;
+#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
-template <> int count_digits<4>(detail::fallback_uintptr n);
-
-#if FMT_GCC_VERSION || FMT_CLANG_VERSION
-# define FMT_ALWAYS_INLINE inline __attribute__((always_inline))
-#elif FMT_MSC_VER
-# define FMT_ALWAYS_INLINE __forceinline
-#else
-# define FMT_ALWAYS_INLINE inline
+// 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);
+}
-// To suppress unnecessary security cookie checks
-#if FMT_MSC_VER && !FMT_CLANG_VERSION
-# define FMT_SAFEBUFFERS __declspec(safebuffers)
-#else
-# define FMT_SAFEBUFFERS
+// Counts the number of digits in n. BITS = log2(radix).
+template <int BITS, typename UInt>
+FMT_CONSTEXPR auto count_digits(UInt n) -> int {
+#ifdef FMT_BUILTIN_CLZ
+ if (!is_constant_evaluated() && num_bits<UInt>() == 32)
+ return (FMT_BUILTIN_CLZ(static_cast<uint32_t>(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
-// Optional version of count_digits for better performance on 32-bit platforms.
-inline int count_digits(uint32_t n) {
- auto t = bsr2log10(FMT_BUILTIN_CLZ(n | 1) ^ 31);
- return t - (n < data::zero_or_powers_of_10_32_new[t]);
+// 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<int>((n + inc) >> 32);
}
#endif
-template <typename Int> constexpr int digits10() FMT_NOEXCEPT {
- return std::numeric_limits<Int>::digits10;
+// 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 int digits10<int128_t>() FMT_NOEXCEPT { return 38; }
-template <> constexpr int digits10<uint128_t>() FMT_NOEXCEPT { return 38; }
-template <typename Char> FMT_API std::string grouping_impl(locale_ref loc);
-template <typename Char> inline std::string grouping(locale_ref loc) {
- return grouping_impl<char>(loc);
-}
-template <> inline std::string grouping<wchar_t>(locale_ref loc) {
- return grouping_impl<wchar_t>(loc);
+template <typename Int> constexpr auto digits10() noexcept -> int {
+ return std::numeric_limits<Int>::digits10;
}
+template <> constexpr auto digits10<int128_opt>() noexcept -> int { return 38; }
+template <> constexpr auto digits10<uint128_t>() noexcept -> int { return 38; }
+
+template <typename Char> struct thousands_sep_result {
+ std::string grouping;
+ Char thousands_sep;
+};
-template <typename Char> FMT_API Char thousands_sep_impl(locale_ref loc);
-template <typename Char> inline Char thousands_sep(locale_ref loc) {
- return Char(thousands_sep_impl<char>(loc));
+template <typename Char>
+FMT_API auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result<Char>;
+template <typename Char>
+inline auto thousands_sep(locale_ref loc) -> thousands_sep_result<Char> {
+ auto result = thousands_sep_impl<char>(loc);
+ return {result.grouping, Char(result.thousands_sep)};
}
-template <> inline wchar_t thousands_sep(locale_ref loc) {
+template <>
+inline auto thousands_sep(locale_ref loc) -> thousands_sep_result<wchar_t> {
return thousands_sep_impl<wchar_t>(loc);
}
-template <typename Char> FMT_API Char decimal_point_impl(locale_ref loc);
-template <typename Char> inline Char decimal_point(locale_ref loc) {
+template <typename Char>
+FMT_API auto decimal_point_impl(locale_ref loc) -> Char;
+template <typename Char> inline auto decimal_point(locale_ref loc) -> Char {
return Char(decimal_point_impl<char>(loc));
}
-template <> inline wchar_t decimal_point(locale_ref loc) {
+template <> inline auto decimal_point(locale_ref loc) -> wchar_t {
return decimal_point_impl<wchar_t>(loc);
}
// Compares two characters for equality.
-template <typename Char> bool equal2(const Char* lhs, const char* rhs) {
- return lhs[0] == rhs[0] && lhs[1] == rhs[1];
+template <typename Char> auto equal2(const Char* lhs, const char* rhs) -> bool {
+ return lhs[0] == Char(rhs[0]) && lhs[1] == Char(rhs[1]);
}
-inline bool equal2(const char* lhs, const char* rhs) {
+inline auto equal2(const char* lhs, const char* rhs) -> bool {
return memcmp(lhs, rhs, 2) == 0;
}
// Copies two characters from src to dst.
-template <typename Char> void copy2(Char* dst, const char* src) {
+template <typename Char>
+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<Char>(*src++);
*dst = static_cast<Char>(*src);
}
-FMT_INLINE void copy2(char* dst, const char* src) { memcpy(dst, src, 2); }
template <typename Iterator> struct format_decimal_result {
Iterator begin;
@@ -1046,8 +1189,8 @@ template <typename Iterator> struct format_decimal_result {
// buffer of specified size. The caller must ensure that the buffer is large
// enough.
template <typename Char, typename UInt>
-inline format_decimal_result<Char*> format_decimal(Char* out, UInt value,
- int size) {
+FMT_CONSTEXPR20 auto format_decimal(Char* out, UInt value, int size)
+ -> format_decimal_result<Char*> {
FMT_ASSERT(size >= count_digits(value), "invalid digit count");
out += size;
Char* end = out;
@@ -1056,7 +1199,7 @@ inline format_decimal_result<Char*> format_decimal(Char* out, UInt value,
// 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, data::digits[value % 100]);
+ copy2(out, digits2(static_cast<size_t>(value % 100)));
value /= 100;
}
if (value < 10) {
@@ -1064,58 +1207,37 @@ inline format_decimal_result<Char*> format_decimal(Char* out, UInt value,
return {out, end};
}
out -= 2;
- copy2(out, data::digits[value]);
+ copy2(out, digits2(static_cast<size_t>(value)));
return {out, end};
}
template <typename Char, typename UInt, typename Iterator,
FMT_ENABLE_IF(!std::is_pointer<remove_cvref_t<Iterator>>::value)>
-inline format_decimal_result<Iterator> format_decimal(Iterator out, UInt value,
- int size) {
+inline auto format_decimal(Iterator out, UInt value, int size)
+ -> format_decimal_result<Iterator> {
// Buffer is large enough to hold all digits (digits10 + 1).
Char buffer[digits10<UInt>() + 1];
auto end = format_decimal(buffer, value, size).end;
- return {out, detail::copy_str<Char>(buffer, end, out)};
+ return {out, detail::copy_str_noinline<Char>(buffer, end, out)};
}
template <unsigned BASE_BITS, typename Char, typename UInt>
-inline Char* format_uint(Char* buffer, UInt value, int num_digits,
- bool upper = false) {
+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" : data::hex_digits;
- unsigned digit = (value & ((1 << BASE_BITS) - 1));
+ const char* digits = upper ? "0123456789ABCDEF" : "0123456789abcdef";
+ unsigned digit = static_cast<unsigned>(value & ((1 << BASE_BITS) - 1));
*--buffer = static_cast<Char>(BASE_BITS < 4 ? static_cast<char>('0' + digit)
: digits[digit]);
} while ((value >>= BASE_BITS) != 0);
return end;
}
-template <unsigned BASE_BITS, typename Char>
-Char* format_uint(Char* buffer, detail::fallback_uintptr n, int num_digits,
- bool = false) {
- auto char_digits = std::numeric_limits<unsigned char>::digits / 4;
- int start = (num_digits + char_digits - 1) / char_digits - 1;
- if (int start_digits = num_digits % char_digits) {
- unsigned value = n.value[start--];
- buffer = format_uint<BASE_BITS>(buffer, value, start_digits);
- }
- for (; start >= 0; --start) {
- unsigned value = n.value[start];
- buffer += char_digits;
- auto p = buffer;
- for (int i = 0; i < char_digits; ++i) {
- unsigned digit = (value & ((1 << BASE_BITS) - 1));
- *--p = static_cast<Char>(data::hex_digits[digit]);
- value >>= BASE_BITS;
- }
- }
- return buffer;
-}
-
template <unsigned BASE_BITS, typename Char, typename It, typename UInt>
-inline It format_uint(It out, UInt value, int num_digits, bool upper = false) {
+inline auto format_uint(It out, UInt value, int num_digits, bool upper = false)
+ -> It {
if (auto ptr = to_pointer<Char>(out, to_unsigned(num_digits))) {
format_uint<BASE_BITS>(ptr, value, num_digits, upper);
return out;
@@ -1123,141 +1245,68 @@ inline It format_uint(It out, UInt value, int num_digits, bool upper = false) {
// Buffer should be large enough to hold all digits (digits / BASE_BITS + 1).
char buffer[num_bits<UInt>() / BASE_BITS + 1];
format_uint<BASE_BITS>(buffer, value, num_digits, upper);
- return detail::copy_str<Char>(buffer, buffer + num_digits, out);
+ return detail::copy_str_noinline<Char>(buffer, buffer + num_digits, out);
}
// A converter from UTF-8 to UTF-16.
class utf8_to_utf16 {
private:
- wmemory_buffer buffer_;
+ basic_memory_buffer<wchar_t> buffer_;
public:
FMT_API explicit utf8_to_utf16(string_view s);
- operator wstring_view() const { return {&buffer_[0], size()}; }
- size_t size() const { return buffer_.size() - 1; }
- const wchar_t* c_str() const { return &buffer_[0]; }
- std::wstring str() const { return {&buffer_[0], size()}; }
-};
-
-template <typename T = void> struct null {};
-
-// Workaround an array initialization issue in gcc 4.8.
-template <typename Char> 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<Char> s) {
- auto size = s.size();
- if (size > max_size) {
- FMT_THROW(format_error("invalid fill"));
- return;
- }
- for (size_t i = 0; i < size; ++i) data_[i] = s[i];
- size_ = static_cast<unsigned char>(size);
- }
-
- size_t size() const { return size_; }
- const Char* data() const { return data_; }
-
- FMT_CONSTEXPR Char& operator[](size_t index) { return data_[index]; }
- FMT_CONSTEXPR const Char& operator[](size_t index) const {
- return data_[index];
- }
-};
-} // namespace detail
-
-// We cannot use enum classes as bit fields because of a gcc bug
-// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414.
-namespace align {
-enum type { none, left, right, center, numeric };
-}
-using align_t = align::type;
-
-namespace sign {
-enum type { none, minus, plus, space };
-}
-using sign_t = sign::type;
-
-// Format specifiers for built-in and string types.
-template <typename Char> struct basic_format_specs {
- int width;
- int precision;
- char type;
- align_t align : 4;
- sign_t sign : 3;
- bool alt : 1; // Alternate form ('#').
- detail::fill_t<Char> fill;
-
- constexpr basic_format_specs()
- : width(0),
- precision(-1),
- type(0),
- align(align::none),
- sign(sign::none),
- alt(false) {}
+ operator basic_string_view<wchar_t>() 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()}; }
};
-using format_specs = basic_format_specs<char>;
-
-namespace detail {
namespace dragonbox {
// Type-specific information that Dragonbox uses.
-template <class T> struct float_info;
+template <typename T, typename Enable = void> struct float_info;
template <> struct float_info<float> {
using carrier_uint = uint32_t;
- static const int significand_bits = 23;
static const int exponent_bits = 8;
- static const int min_exponent = -126;
- static const int max_exponent = 127;
- static const int exponent_bias = -127;
- static const int decimal_digits = 9;
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 cache_bits = 64;
static const int divisibility_check_by_5_threshold = 39;
static const int case_fc_pm_half_lower_threshold = -1;
- static const int case_fc_pm_half_upper_threshold = 6;
- static const int case_fc_lower_threshold = -2;
- static const int case_fc_upper_threshold = 6;
- static const int case_shorter_interval_left_endpoint_lower_threshold = 2;
- static const int case_shorter_interval_left_endpoint_upper_threshold = 3;
static const int shorter_interval_tie_lower_threshold = -35;
static const int shorter_interval_tie_upper_threshold = -35;
- static const int max_trailing_zeros = 7;
};
template <> struct float_info<double> {
using carrier_uint = uint64_t;
- static const int significand_bits = 52;
static const int exponent_bits = 11;
- static const int min_exponent = -1022;
- static const int max_exponent = 1023;
- static const int exponent_bias = -1023;
- static const int decimal_digits = 17;
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 = 326;
- static const int cache_bits = 128;
static const int divisibility_check_by_5_threshold = 86;
static const int case_fc_pm_half_lower_threshold = -2;
- static const int case_fc_pm_half_upper_threshold = 9;
- static const int case_fc_lower_threshold = -4;
- static const int case_fc_upper_threshold = 9;
- static const int case_shorter_interval_left_endpoint_lower_threshold = 2;
- static const int case_shorter_interval_left_endpoint_upper_threshold = 3;
static const int shorter_interval_tie_lower_threshold = -77;
static const int shorter_interval_tie_upper_threshold = -77;
- static const int max_trailing_zeros = 16;
+};
+
+// An 80- or 128-bit floating point number.
+template <typename T>
+struct float_info<T, enable_if_t<std::numeric_limits<T>::digits == 64 ||
+ std::numeric_limits<T>::digits == 113 ||
+ is_float128<T>::value>> {
+ using carrier_uint = detail::uint128_t;
+ static const int exponent_bits = 15;
+};
+
+// A double-double floating point number.
+template <typename T>
+struct float_info<T, enable_if_t<is_double_double<T>::value>> {
+ using carrier_uint = detail::uint128_t;
};
template <typename T> struct decimal_fp {
@@ -1266,37 +1315,40 @@ template <typename T> struct decimal_fp {
int exponent;
};
-template <typename T> FMT_API decimal_fp<T> to_decimal(T x) FMT_NOEXCEPT;
+template <typename T> FMT_API auto to_decimal(T x) noexcept -> decimal_fp<T>;
} // namespace dragonbox
-template <typename T>
-constexpr typename dragonbox::float_info<T>::carrier_uint exponent_mask() {
- using uint = typename dragonbox::float_info<T>::carrier_uint;
- return ((uint(1) << dragonbox::float_info<T>::exponent_bits) - 1)
- << dragonbox::float_info<T>::significand_bits;
-}
-
-// 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
-};
+// Returns true iff Float has the implicit bit which is not stored.
+template <typename Float> constexpr bool has_implicit_bit() {
+ // An 80-bit FP number has a 64-bit significand an no implicit bit.
+ return std::numeric_limits<Float>::digits != 64;
+}
-struct float_specs {
- int precision;
- float_format format : 8;
- sign_t sign : 8;
- bool upper : 1;
- bool locale : 1;
- bool binary32 : 1;
- bool use_grisu : 1;
- bool showpoint : 1;
-};
+// Returns the number of significand bits stored in Float. The implicit bit is
+// not counted since it is not stored.
+template <typename Float> constexpr int num_significand_bits() {
+ // std::numeric_limits may not support __float128.
+ return is_float128<Float>() ? 112
+ : (std::numeric_limits<Float>::digits -
+ (has_implicit_bit<Float>() ? 1 : 0));
+}
+
+template <typename Float>
+constexpr auto exponent_mask() ->
+ typename dragonbox::float_info<Float>::carrier_uint {
+ using uint = typename dragonbox::float_info<Float>::carrier_uint;
+ return ((uint(1) << dragonbox::float_info<Float>::exponent_bits) - 1)
+ << num_significand_bits<Float>();
+}
+template <typename Float> constexpr auto exponent_bias() -> int {
+ // std::numeric_limits may not support __float128.
+ return is_float128<Float>() ? 16383
+ : std::numeric_limits<Float>::max_exponent - 1;
+}
// Writes the exponent exp in the form "[+-]d{2,3}" to buffer.
-template <typename Char, typename It> It write_exponent(int exp, It it) {
+template <typename Char, typename It>
+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<Char>('-');
@@ -1305,185 +1357,269 @@ template <typename Char, typename It> It write_exponent(int exp, It it) {
*it++ = static_cast<Char>('+');
}
if (exp >= 100) {
- const char* top = data::digits[exp / 100];
+ const char* top = digits2(to_unsigned(exp / 100));
if (exp >= 1000) *it++ = static_cast<Char>(top[0]);
*it++ = static_cast<Char>(top[1]);
exp %= 100;
}
- const char* d = data::digits[exp];
+ const char* d = digits2(to_unsigned(exp));
*it++ = static_cast<Char>(d[0]);
*it++ = static_cast<Char>(d[1]);
return it;
}
-template <typename T>
-int format_float(T value, int precision, float_specs specs, buffer<char>& buf);
-
-// Formats a floating-point number with snprintf.
-template <typename T>
-int snprintf_float(T value, int precision, float_specs specs,
- buffer<char>& buf);
-
-template <typename T> T promote_float(T value) { return value; }
-inline double promote_float(float value) { return static_cast<double>(value); }
-
-template <typename Handler>
-FMT_CONSTEXPR void handle_int_type_spec(char spec, Handler&& handler) {
- switch (spec) {
- case 0:
- case 'd':
- handler.on_dec();
- break;
- case 'x':
- case 'X':
- handler.on_hex();
- break;
- case 'b':
- case 'B':
- handler.on_bin();
- break;
- case 'o':
- handler.on_oct();
- break;
-#ifdef FMT_DEPRECATED_N_SPECIFIER
- case 'n':
-#endif
- case 'L':
- handler.on_num();
- break;
- case 'c':
- handler.on_chr();
- break;
- default:
- handler.on_error();
- }
-}
-
-template <typename ErrorHandler = error_handler, typename Char>
-FMT_CONSTEXPR float_specs parse_float_type_spec(
- const basic_format_specs<Char>& specs, ErrorHandler&& eh = {}) {
- auto result = float_specs();
- result.showpoint = specs.alt;
- switch (specs.type) {
- case 0:
- result.format = float_format::general;
- result.showpoint |= specs.precision > 0;
- break;
- case 'G':
- result.upper = true;
- FMT_FALLTHROUGH;
- case 'g':
- result.format = float_format::general;
- break;
- case 'E':
- result.upper = true;
- FMT_FALLTHROUGH;
- case 'e':
- result.format = float_format::exp;
- result.showpoint |= specs.precision != 0;
- break;
- case 'F':
- result.upper = true;
- FMT_FALLTHROUGH;
- case 'f':
- result.format = float_format::fixed;
- result.showpoint |= specs.precision != 0;
- break;
- case 'A':
- result.upper = true;
- FMT_FALLTHROUGH;
- case 'a':
- result.format = float_format::hex;
- break;
-#ifdef FMT_DEPRECATED_N_SPECIFIER
- case 'n':
-#endif
- case 'L':
- result.locale = true;
- break;
- default:
- eh.on_error("invalid type specifier");
- break;
+// A floating-point number f * pow(2, e) where F is an unsigned type.
+template <typename F> struct basic_fp {
+ F f;
+ int e;
+
+ static constexpr const int num_significand_bits =
+ static_cast<int>(sizeof(F) * num_bits<unsigned char>());
+
+ 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 <typename Float> FMT_CONSTEXPR basic_fp(Float n) { assign(n); }
+
+ // Assigns n to this and return true iff predecessor is closer than successor.
+ template <typename Float, FMT_ENABLE_IF(!is_double_double<Float>::value)>
+ FMT_CONSTEXPR auto assign(Float n) -> bool {
+ static_assert(std::numeric_limits<Float>::digits <= 113, "unsupported FP");
+ // Assume Float is in the format [sign][exponent][significand].
+ using carrier_uint = typename dragonbox::float_info<Float>::carrier_uint;
+ const auto num_float_significand_bits =
+ detail::num_significand_bits<Float>();
+ const auto implicit_bit = carrier_uint(1) << num_float_significand_bits;
+ const auto significand_mask = implicit_bit - 1;
+ auto u = bit_cast<carrier_uint>(n);
+ f = static_cast<F>(u & significand_mask);
+ auto biased_e = static_cast<int>((u & exponent_mask<Float>()) >>
+ 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<Float>())
+ f += static_cast<F>(implicit_bit);
+ e = biased_e - exponent_bias<Float>() - num_float_significand_bits;
+ if (!has_implicit_bit<Float>()) ++e;
+ return is_predecessor_closer;
+ }
+
+ template <typename Float, FMT_ENABLE_IF(is_double_double<Float>::value)>
+ FMT_CONSTEXPR auto assign(Float n) -> bool {
+ static_assert(std::numeric_limits<double>::is_iec559, "unsupported FP");
+ return assign(static_cast<double>(n));
}
- return result;
-}
-
-template <typename Char, typename Handler>
-FMT_CONSTEXPR void handle_char_specs(const basic_format_specs<Char>* specs,
- Handler&& handler) {
- if (!specs) return handler.on_char();
- if (specs->type && specs->type != 'c') return handler.on_int();
- if (specs->align == align::numeric || specs->sign != sign::none || specs->alt)
- handler.on_error("invalid format specifier for char");
- handler.on_char();
-}
-
-template <typename Char, typename Handler>
-FMT_CONSTEXPR void handle_cstring_type_spec(Char spec, Handler&& handler) {
- if (spec == 0 || spec == 's')
- handler.on_string();
- else if (spec == 'p')
- handler.on_pointer();
- else
- handler.on_error("invalid type specifier");
-}
+};
-template <typename Char, typename ErrorHandler>
-FMT_CONSTEXPR void check_string_type_spec(Char spec, ErrorHandler&& eh) {
- if (spec != 0 && spec != 's') eh.on_error("invalid type specifier");
+using fp = basic_fp<unsigned long long>;
+
+// Normalizes the value converted from double and multiplied by (1 << SHIFT).
+template <int SHIFT = 0, typename F>
+FMT_CONSTEXPR basic_fp<F> normalize(basic_fp<F> value) {
+ // Handle subnormals.
+ const auto implicit_bit = F(1) << num_significand_bits<double>();
+ 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<F>::num_significand_bits -
+ num_significand_bits<double>() - SHIFT - 1;
+ value.f <<= offset;
+ value.e -= offset;
+ return value;
}
-template <typename Char, typename ErrorHandler>
-FMT_CONSTEXPR void check_pointer_type_spec(Char spec, ErrorHandler&& eh) {
- if (spec != 0 && spec != 'p') eh.on_error("invalid type specifier");
+// Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking.
+FMT_CONSTEXPR inline uint64_t multiply(uint64_t lhs, uint64_t rhs) {
+#if FMT_USE_INT128
+ auto product = static_cast<__uint128_t>(lhs) * rhs;
+ auto f = static_cast<uint64_t>(product >> 64);
+ return (static_cast<uint64_t>(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
}
-template <typename ErrorHandler> class int_type_checker : private ErrorHandler {
- public:
- FMT_CONSTEXPR explicit int_type_checker(ErrorHandler eh) : ErrorHandler(eh) {}
+FMT_CONSTEXPR inline fp operator*(fp x, fp y) {
+ return {multiply(x.f, y.f), x.e + y.e + 64};
+}
+
+template <typename T = void> struct basic_data {
+ // Normalized 64-bit significands of pow(10, k), for k = -348, -340, ..., 340.
+ // These are generated by support/compute-powers.py.
+ static constexpr uint64_t pow10_significands[87] = {
+ 0xfa8fd5a0081c0288, 0xbaaee17fa23ebf76, 0x8b16fb203055ac76,
+ 0xcf42894a5dce35ea, 0x9a6bb0aa55653b2d, 0xe61acf033d1a45df,
+ 0xab70fe17c79ac6ca, 0xff77b1fcbebcdc4f, 0xbe5691ef416bd60c,
+ 0x8dd01fad907ffc3c, 0xd3515c2831559a83, 0x9d71ac8fada6c9b5,
+ 0xea9c227723ee8bcb, 0xaecc49914078536d, 0x823c12795db6ce57,
+ 0xc21094364dfb5637, 0x9096ea6f3848984f, 0xd77485cb25823ac7,
+ 0xa086cfcd97bf97f4, 0xef340a98172aace5, 0xb23867fb2a35b28e,
+ 0x84c8d4dfd2c63f3b, 0xc5dd44271ad3cdba, 0x936b9fcebb25c996,
+ 0xdbac6c247d62a584, 0xa3ab66580d5fdaf6, 0xf3e2f893dec3f126,
+ 0xb5b5ada8aaff80b8, 0x87625f056c7c4a8b, 0xc9bcff6034c13053,
+ 0x964e858c91ba2655, 0xdff9772470297ebd, 0xa6dfbd9fb8e5b88f,
+ 0xf8a95fcf88747d94, 0xb94470938fa89bcf, 0x8a08f0f8bf0f156b,
+ 0xcdb02555653131b6, 0x993fe2c6d07b7fac, 0xe45c10c42a2b3b06,
+ 0xaa242499697392d3, 0xfd87b5f28300ca0e, 0xbce5086492111aeb,
+ 0x8cbccc096f5088cc, 0xd1b71758e219652c, 0x9c40000000000000,
+ 0xe8d4a51000000000, 0xad78ebc5ac620000, 0x813f3978f8940984,
+ 0xc097ce7bc90715b3, 0x8f7e32ce7bea5c70, 0xd5d238a4abe98068,
+ 0x9f4f2726179a2245, 0xed63a231d4c4fb27, 0xb0de65388cc8ada8,
+ 0x83c7088e1aab65db, 0xc45d1df942711d9a, 0x924d692ca61be758,
+ 0xda01ee641a708dea, 0xa26da3999aef774a, 0xf209787bb47d6b85,
+ 0xb454e4a179dd1877, 0x865b86925b9bc5c2, 0xc83553c5c8965d3d,
+ 0x952ab45cfa97a0b3, 0xde469fbd99a05fe3, 0xa59bc234db398c25,
+ 0xf6c69a72a3989f5c, 0xb7dcbf5354e9bece, 0x88fcf317f22241e2,
+ 0xcc20ce9bd35c78a5, 0x98165af37b2153df, 0xe2a0b5dc971f303a,
+ 0xa8d9d1535ce3b396, 0xfb9b7cd9a4a7443c, 0xbb764c4ca7a44410,
+ 0x8bab8eefb6409c1a, 0xd01fef10a657842c, 0x9b10a4e5e9913129,
+ 0xe7109bfba19c0c9d, 0xac2820d9623bf429, 0x80444b5e7aa7cf85,
+ 0xbf21e44003acdd2d, 0x8e679c2f5e44ff8f, 0xd433179d9c8cb841,
+ 0x9e19db92b4e31ba9, 0xeb96bf6ebadf77d9, 0xaf87023b9bf0ee6b,
+ };
- FMT_CONSTEXPR void on_dec() {}
- FMT_CONSTEXPR void on_hex() {}
- FMT_CONSTEXPR void on_bin() {}
- FMT_CONSTEXPR void on_oct() {}
- FMT_CONSTEXPR void on_num() {}
- FMT_CONSTEXPR void on_chr() {}
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wnarrowing"
+#endif
+ // Binary exponents of pow(10, k), for k = -348, -340, ..., 340, corresponding
+ // to significands above.
+ static constexpr int16_t pow10_exponents[87] = {
+ -1220, -1193, -1166, -1140, -1113, -1087, -1060, -1034, -1007, -980, -954,
+ -927, -901, -874, -847, -821, -794, -768, -741, -715, -688, -661,
+ -635, -608, -582, -555, -529, -502, -475, -449, -422, -396, -369,
+ -343, -316, -289, -263, -236, -210, -183, -157, -130, -103, -77,
+ -50, -24, 3, 30, 56, 83, 109, 136, 162, 189, 216,
+ 242, 269, 295, 322, 348, 375, 402, 428, 455, 481, 508,
+ 534, 561, 588, 614, 641, 667, 694, 720, 747, 774, 800,
+ 827, 853, 880, 907, 933, 960, 986, 1013, 1039, 1066};
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+# pragma GCC diagnostic pop
+#endif
- FMT_CONSTEXPR void on_error() {
- ErrorHandler::on_error("invalid type specifier");
- }
+ static constexpr uint64_t power_of_10_64[20] = {
+ 1, FMT_POWERS_OF_10(1ULL), FMT_POWERS_OF_10(1000000000ULL),
+ 10000000000000000000ULL};
};
-template <typename ErrorHandler>
-class char_specs_checker : public ErrorHandler {
- private:
- char type_;
+#if FMT_CPLUSPLUS < 201703L
+template <typename T> constexpr uint64_t basic_data<T>::pow10_significands[];
+template <typename T> constexpr int16_t basic_data<T>::pow10_exponents[];
+template <typename T> constexpr uint64_t basic_data<T>::power_of_10_64[];
+#endif
- public:
- FMT_CONSTEXPR char_specs_checker(char type, ErrorHandler eh)
- : ErrorHandler(eh), type_(type) {}
+// This is a struct rather than an alias to avoid shadowing warnings in gcc.
+struct data : basic_data<> {};
- FMT_CONSTEXPR void on_int() {
- handle_int_type_spec(type_, int_type_checker<ErrorHandler>(*this));
+// Returns a cached power of 10 `c_k = c_k.f * pow(2, c_k.e)` such that its
+// (binary) exponent satisfies `min_exponent <= c_k.e <= min_exponent + 28`.
+FMT_CONSTEXPR inline fp get_cached_power(int min_exponent,
+ int& pow10_exponent) {
+ const int shift = 32;
+ // log10(2) = 0x0.4d104d427de7fbcc...
+ const int64_t significand = 0x4d104d427de7fbcc;
+ int index = static_cast<int>(
+ ((min_exponent + fp::num_significand_bits - 1) * (significand >> shift) +
+ ((int64_t(1) << shift) - 1)) // ceil
+ >> 32 // arithmetic shift
+ );
+ // Decimal exponent of the first (smallest) cached power of 10.
+ const int first_dec_exp = -348;
+ // Difference between 2 consecutive decimal exponents in cached powers of 10.
+ const int dec_exp_step = 8;
+ index = (index - first_dec_exp - 1) / dec_exp_step + 1;
+ pow10_exponent = first_dec_exp + index * dec_exp_step;
+ return {data::pow10_significands[index], data::pow10_exponents[index]};
+}
+
+#ifndef _MSC_VER
+# define FMT_SNPRINTF snprintf
+#else
+FMT_API auto fmt_snprintf(char* buf, size_t size, const char* fmt, ...) -> int;
+# define FMT_SNPRINTF fmt_snprintf
+#endif // _MSC_VER
+
+// Formats a floating-point number with snprintf using the hexfloat format.
+template <typename T>
+auto snprintf_float(T value, int precision, float_specs specs,
+ buffer<char>& buf) -> int {
+ // Buffer capacity must be non-zero, otherwise MSVC's vsnprintf_s will fail.
+ FMT_ASSERT(buf.capacity() > buf.size(), "empty buffer");
+ FMT_ASSERT(specs.format == float_format::hex, "");
+ static_assert(!std::is_same<T, float>::value, "");
+
+ // Build the format string.
+ char format[7]; // The longest format is "%#.*Le".
+ char* format_ptr = format;
+ *format_ptr++ = '%';
+ if (specs.showpoint) *format_ptr++ = '#';
+ if (precision >= 0) {
+ *format_ptr++ = '.';
+ *format_ptr++ = '*';
+ }
+ if (std::is_same<T, long double>()) *format_ptr++ = 'L';
+ *format_ptr++ = specs.upper ? 'A' : 'a';
+ *format_ptr = '\0';
+
+ // Format using snprintf.
+ auto offset = buf.size();
+ for (;;) {
+ auto begin = buf.data() + offset;
+ auto capacity = buf.capacity() - offset;
+ abort_fuzzing_if(precision > 100000);
+ // Suppress the warning about a nonliteral format string.
+ // Cannot use auto because of a bug in MinGW (#1532).
+ int (*snprintf_ptr)(char*, size_t, const char*, ...) = FMT_SNPRINTF;
+ int result = precision >= 0
+ ? snprintf_ptr(begin, capacity, format, precision, value)
+ : snprintf_ptr(begin, capacity, format, value);
+ if (result < 0) {
+ // The buffer will grow exponentially.
+ buf.try_reserve(buf.capacity() + 1);
+ continue;
+ }
+ auto size = to_unsigned(result);
+ // Size equal to capacity means that the last character was truncated.
+ if (size < capacity) {
+ buf.try_resize(size + offset);
+ return 0;
+ }
+ buf.try_reserve(size + offset + 1); // Add 1 for the terminating '\0'.
}
- FMT_CONSTEXPR void on_char() {}
-};
+}
-template <typename ErrorHandler>
-class cstring_type_checker : public ErrorHandler {
- public:
- FMT_CONSTEXPR explicit cstring_type_checker(ErrorHandler eh)
- : ErrorHandler(eh) {}
+template <typename T>
+using convert_float_result =
+ conditional_t<std::is_same<T, float>::value || sizeof(T) == sizeof(double),
+ double, T>;
- FMT_CONSTEXPR void on_string() {}
- FMT_CONSTEXPR void on_pointer() {}
-};
+template <typename T>
+constexpr auto convert_float(T value) -> convert_float_result<T> {
+ return static_cast<convert_float_result<T>>(value);
+}
template <typename OutputIt, typename Char>
-FMT_NOINLINE OutputIt fill(OutputIt it, size_t n, const fill_t<Char>& fill) {
+FMT_NOINLINE FMT_CONSTEXPR auto fill(OutputIt it, size_t n,
+ const fill_t<Char>& fill) -> OutputIt {
auto fill_size = fill.size();
- if (fill_size == 1) return std::fill_n(it, n, fill[0]);
- for (size_t i = 0; i < n; ++i) it = std::copy_n(fill.data(), fill_size, it);
+ 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<Char>(data, data + fill_size, it);
return it;
}
@@ -1492,39 +1628,234 @@ FMT_NOINLINE OutputIt fill(OutputIt it, size_t n, const fill_t<Char>& fill) {
// width: output display width in (terminal) column positions.
template <align::type align = align::left, typename OutputIt, typename Char,
typename F>
-inline OutputIt write_padded(OutputIt out,
- const basic_format_specs<Char>& specs, size_t size,
- size_t width, F&& f) {
+FMT_CONSTEXPR auto write_padded(OutputIt out,
+ const basic_format_specs<Char>& 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;
- auto* shifts = align == align::left ? data::left_padding_shifts
- : data::right_padding_shifts;
+ // 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());
- it = fill(it, left_padding, specs.fill);
+ if (left_padding != 0) it = fill(it, left_padding, specs.fill);
it = f(it);
- it = fill(it, padding - left_padding, specs.fill);
+ if (right_padding != 0) it = fill(it, right_padding, specs.fill);
return base_iterator(out, it);
}
template <align::type align = align::left, typename OutputIt, typename Char,
typename F>
-inline OutputIt write_padded(OutputIt out,
- const basic_format_specs<Char>& specs, size_t size,
- F&& f) {
+constexpr auto write_padded(OutputIt out, const basic_format_specs<Char>& specs,
+ size_t size, F&& f) -> OutputIt {
return write_padded<align>(out, specs, size, size, f);
}
+template <align::type align = align::left, typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write_bytes(OutputIt out, string_view bytes,
+ const basic_format_specs<Char>& specs)
+ -> OutputIt {
+ return write_padded<align>(
+ out, specs, bytes.size(), [bytes](reserve_iterator<OutputIt> it) {
+ const char* data = bytes.data();
+ return copy_str<Char>(data, data + bytes.size(), it);
+ });
+}
+
+template <typename Char, typename OutputIt, typename UIntPtr>
+auto write_ptr(OutputIt out, UIntPtr value,
+ const basic_format_specs<Char>* specs) -> OutputIt {
+ int num_digits = count_digits<4>(value);
+ auto size = to_unsigned(num_digits) + size_t(2);
+ auto write = [=](reserve_iterator<OutputIt> it) {
+ *it++ = static_cast<Char>('0');
+ *it++ = static_cast<Char>('x');
+ return format_uint<4, Char>(it, value, num_digits);
+ };
+ return specs ? write_padded<align::right>(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 <typename Char> struct find_escape_result {
+ const Char* begin;
+ const Char* end;
+ uint32_t cp;
+};
+
+template <typename Char>
+using make_unsigned_char =
+ typename conditional_t<std::is_integral<Char>::value,
+ std::make_unsigned<Char>,
+ type_identity<uint32_t>>::type;
+
+template <typename Char>
+auto find_escape(const Char* begin, const Char* end)
+ -> find_escape_result<Char> {
+ for (; begin != end; ++begin) {
+ uint32_t cp = static_cast<make_unsigned_char<Char>>(*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<char> {
+ if (!is_utf8()) return find_escape<char>(begin, end);
+ auto result = find_escape_result<char>{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_GCC_VISIBILITY_HIDDEN FMT_COMPILE_STRING : base { \
+ using char_type = fmt::remove_cvref_t<decltype(s[0])>; \
+ FMT_MAYBE_UNUSED FMT_CONSTEXPR explicit \
+ operator fmt::basic_string_view<char_type>() const { \
+ return fmt::detail_exported::compile_string_to_view<char_type>(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 <size_t width, typename Char, typename OutputIt>
+auto write_codepoint(OutputIt out, char prefix, uint32_t cp) -> OutputIt {
+ *out++ = static_cast<Char>('\\');
+ *out++ = static_cast<Char>(prefix);
+ Char buf[width];
+ fill_n(buf, width, static_cast<Char>('0'));
+ format_uint<4>(buf, cp, width);
+ return copy_str<Char>(buf, buf + width, out);
+}
+
+template <typename OutputIt, typename Char>
+auto write_escaped_cp(OutputIt out, const find_escape_result<Char>& escape)
+ -> OutputIt {
+ auto c = static_cast<Char>(escape.cp);
+ switch (escape.cp) {
+ case '\n':
+ *out++ = static_cast<Char>('\\');
+ c = static_cast<Char>('n');
+ break;
+ case '\r':
+ *out++ = static_cast<Char>('\\');
+ c = static_cast<Char>('r');
+ break;
+ case '\t':
+ *out++ = static_cast<Char>('\\');
+ c = static_cast<Char>('t');
+ break;
+ case '"':
+ FMT_FALLTHROUGH;
+ case '\'':
+ FMT_FALLTHROUGH;
+ case '\\':
+ *out++ = static_cast<Char>('\\');
+ break;
+ default:
+ if (is_utf8()) {
+ 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<Char>(
+ escape.begin, to_unsigned(escape.end - escape.begin))) {
+ out = write_codepoint<2, Char>(out, 'x',
+ static_cast<uint32_t>(escape_char) & 0xFF);
+ }
+ return out;
+ }
+ *out++ = c;
+ return out;
+}
+
template <typename Char, typename OutputIt>
-OutputIt write_bytes(OutputIt out, string_view bytes,
- const basic_format_specs<Char>& specs) {
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
- return write_padded(out, specs, bytes.size(), [bytes](iterator it) {
- const char* data = bytes.data();
- return copy_str<Char>(data, data + bytes.size(), it);
+auto write_escaped_string(OutputIt out, basic_string_view<Char> str)
+ -> OutputIt {
+ *out++ = static_cast<Char>('"');
+ auto begin = str.begin(), end = str.end();
+ do {
+ auto escape = find_escape(begin, end);
+ out = copy_str<Char>(begin, escape.begin, out);
+ begin = escape.end;
+ if (!begin) break;
+ out = write_escaped_cp<OutputIt, Char>(out, escape);
+ } while (begin != end);
+ *out++ = static_cast<Char>('"');
+ return out;
+}
+
+template <typename Char, typename OutputIt>
+auto write_escaped_char(OutputIt out, Char v) -> OutputIt {
+ *out++ = static_cast<Char>('\'');
+ if ((needs_escape(static_cast<uint32_t>(v)) && v != static_cast<Char>('"')) ||
+ v == static_cast<Char>('\'')) {
+ out = write_escaped_cp(
+ out, find_escape_result<Char>{&v, &v + 1, static_cast<uint32_t>(v)});
+ } else {
+ *out++ = v;
+ }
+ *out++ = static_cast<Char>('\'');
+ return out;
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write_char(OutputIt out, Char value,
+ const basic_format_specs<Char>& specs)
+ -> OutputIt {
+ bool is_debug = specs.type == presentation_type::debug;
+ return write_padded(out, specs, 1, [=](reserve_iterator<OutputIt> it) {
+ if (is_debug) return write_escaped_char(it, value);
+ *it++ = value;
+ return it;
});
}
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, Char value,
+ const basic_format_specs<Char>& specs,
+ locale_ref loc = {}) -> OutputIt {
+ return check_char_specs(specs)
+ ? write_char(out, value, specs)
+ : write(out, static_cast<int>(value), specs, loc);
+}
// Data for write_int that doesn't depend on output iterator type. It is used to
// avoid template code bloat.
@@ -1532,9 +1863,9 @@ template <typename Char> struct write_int_data {
size_t size;
size_t padding;
- write_int_data(int num_digits, string_view prefix,
- const basic_format_specs<Char>& specs)
- : size(prefix.size() + to_unsigned(num_digits)), padding(0) {
+ FMT_CONSTEXPR write_int_data(int num_digits, unsigned prefix,
+ const basic_format_specs<Char>& specs)
+ : size((prefix >> 24) + to_unsigned(num_digits)), padding(0) {
if (specs.align == align::numeric) {
auto width = to_unsigned(specs.width);
if (width > size) {
@@ -1542,7 +1873,7 @@ template <typename Char> struct write_int_data {
size = width;
}
} else if (specs.precision > num_digits) {
- size = prefix.size() + to_unsigned(specs.precision);
+ size = (prefix >> 24) + to_unsigned(specs.precision);
padding = to_unsigned(specs.precision - num_digits);
}
}
@@ -1550,183 +1881,348 @@ template <typename Char> struct write_int_data {
// Writes an integer in the format
// <left-padding><prefix><numeric-padding><digits><right-padding>
-// where <digits> are written by f(it).
-template <typename OutputIt, typename Char, typename F>
-OutputIt write_int(OutputIt out, int num_digits, string_view prefix,
- const basic_format_specs<Char>& specs, F f) {
+// where <digits> are written by write_digits(it).
+// prefix contains chars in three lower bytes and the size in the fourth byte.
+template <typename OutputIt, typename Char, typename W>
+FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, int num_digits,
+ unsigned prefix,
+ const basic_format_specs<Char>& 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<Char>(p & 0xff);
+ }
+ return base_iterator(out, write_digits(it));
+ }
auto data = write_int_data<Char>(num_digits, prefix, specs);
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
- return write_padded<align::right>(out, specs, data.size, [=](iterator it) {
- if (prefix.size() != 0)
- it = copy_str<Char>(prefix.begin(), prefix.end(), it);
- it = std::fill_n(it, data.padding, static_cast<Char>('0'));
- return f(it);
- });
+ return write_padded<align::right>(
+ out, specs, data.size, [=](reserve_iterator<OutputIt> it) {
+ for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8)
+ *it++ = static_cast<Char>(p & 0xff);
+ it = detail::fill_n(it, data.padding, static_cast<Char>('0'));
+ return write_digits(it);
+ });
}
-template <typename StrChar, typename Char, typename OutputIt>
-OutputIt write(OutputIt out, basic_string_view<StrChar> s,
- const basic_format_specs<Char>& specs) {
- 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));
- auto width = specs.width != 0
- ? count_code_points(basic_string_view<StrChar>(data, size))
- : 0;
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
- return write_padded(out, specs, size, width, [=](iterator it) {
- return copy_str<Char>(data, data + size, it);
- });
-}
+template <typename Char> class digit_grouping {
+ private:
+ thousands_sep_result<Char> sep_;
-// The handle_int_type_spec handler that writes an integer.
-template <typename OutputIt, typename Char, typename UInt> struct int_writer {
- OutputIt out;
- locale_ref locale;
- const basic_format_specs<Char>& specs;
- UInt abs_value;
- char prefix[4];
- unsigned prefix_size;
-
- using iterator =
- remove_reference_t<decltype(reserve(std::declval<OutputIt&>(), 0))>;
-
- string_view get_prefix() const { return string_view(prefix, prefix_size); }
-
- template <typename Int>
- int_writer(OutputIt output, locale_ref loc, Int value,
- const basic_format_specs<Char>& s)
- : out(output),
- locale(loc),
- specs(s),
- abs_value(static_cast<UInt>(value)),
- prefix_size(0) {
- static_assert(std::is_same<uint32_or_64_or_128_t<Int>, UInt>::value, "");
- if (is_negative(value)) {
- prefix[0] = '-';
- ++prefix_size;
- abs_value = 0 - abs_value;
- } else if (specs.sign != sign::none && specs.sign != sign::minus) {
- prefix[0] = specs.sign == sign::plus ? '+' : ' ';
- ++prefix_size;
+ struct next_state {
+ std::string::const_iterator group;
+ int pos;
+ };
+ next_state initial_state() const { return {sep_.grouping.begin(), 0}; }
+
+ // Returns the next digit group separator position.
+ int next(next_state& state) const {
+ if (!sep_.thousands_sep) return max_value<int>();
+ if (state.group == sep_.grouping.end())
+ return state.pos += sep_.grouping.back();
+ if (*state.group <= 0 || *state.group == max_value<char>())
+ return max_value<int>();
+ state.pos += *state.group++;
+ return state.pos;
+ }
+
+ public:
+ explicit digit_grouping(locale_ref loc, bool localized = true) {
+ if (localized)
+ sep_ = thousands_sep<Char>(loc);
+ else
+ sep_.thousands_sep = Char();
+ }
+ explicit digit_grouping(thousands_sep_result<Char> sep) : sep_(sep) {}
+
+ Char separator() const { return sep_.thousands_sep; }
+
+ int count_separators(int num_digits) const {
+ 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 <typename Out, typename C>
+ Out apply(Out out, basic_string_view<C> digits) const {
+ auto num_digits = static_cast<int>(digits.size());
+ auto separators = basic_memory_buffer<int>();
+ 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<int>(separators.size() - 1);
+ i < num_digits; ++i) {
+ if (num_digits - i == separators[sep_index]) {
+ *out++ = separator();
+ --sep_index;
+ }
+ *out++ = static_cast<Char>(digits[to_unsigned(i)]);
+ }
+ return out;
}
+};
- void on_dec() {
+template <typename OutputIt, typename UInt, typename Char>
+auto write_int_localized(OutputIt out, UInt value, unsigned prefix,
+ const basic_format_specs<Char>& specs,
+ const digit_grouping<Char>& grouping) -> OutputIt {
+ static_assert(std::is_same<uint64_or_128_t<UInt>, UInt>::value, "");
+ int num_digits = count_digits(value);
+ char digits[40];
+ format_decimal(digits, value, num_digits);
+ unsigned size = to_unsigned((prefix != 0 ? 1 : 0) + num_digits +
+ grouping.count_separators(num_digits));
+ return write_padded<align::right>(
+ out, specs, size, size, [&](reserve_iterator<OutputIt> it) {
+ if (prefix != 0) *it++ = static_cast<Char>(prefix);
+ return grouping.apply(it, string_view(digits, to_unsigned(num_digits)));
+ });
+}
+
+template <typename OutputIt, typename UInt, typename Char>
+auto write_int_localized(OutputIt& out, UInt value, unsigned prefix,
+ const basic_format_specs<Char>& specs, locale_ref loc)
+ -> bool {
+ auto grouping = digit_grouping<Char>(loc);
+ out = write_int_localized(out, value, prefix, specs, grouping);
+ return true;
+}
+
+FMT_CONSTEXPR inline void prefix_append(unsigned& prefix, unsigned value) {
+ prefix |= prefix != 0 ? value << 8 : value;
+ prefix += (1u + (value > 0xff ? 1 : 0)) << 24;
+}
+
+template <typename UInt> struct write_int_arg {
+ UInt abs_value;
+ unsigned prefix;
+};
+
+template <typename T>
+FMT_CONSTEXPR auto make_write_int_arg(T value, sign_t sign)
+ -> write_int_arg<uint32_or_64_or_128_t<T>> {
+ auto prefix = 0u;
+ auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(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 <typename Char, typename OutputIt, typename T>
+FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, write_int_arg<T> arg,
+ const basic_format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ static_assert(std::is_same<T, uint32_or_64_or_128_t<T>>::value, "");
+ auto abs_value = arg.abs_value;
+ auto prefix = arg.prefix;
+ switch (specs.type) {
+ case presentation_type::none:
+ case presentation_type::dec: {
+ if (specs.localized &&
+ write_int_localized(out, static_cast<uint64_or_128_t<T>>(abs_value),
+ prefix, specs, loc)) {
+ return out;
+ }
auto num_digits = count_digits(abs_value);
- out = write_int(
- out, num_digits, get_prefix(), specs, [this, num_digits](iterator it) {
+ return write_int(
+ out, num_digits, prefix, specs, [=](reserve_iterator<OutputIt> it) {
return format_decimal<Char>(it, abs_value, num_digits).end;
});
}
-
- void on_hex() {
- if (specs.alt) {
- prefix[prefix_size++] = '0';
- prefix[prefix_size++] = specs.type;
- }
+ 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);
- out = write_int(out, num_digits, get_prefix(), specs,
- [this, num_digits](iterator it) {
- return format_uint<4, Char>(it, abs_value, num_digits,
- specs.type != 'x');
- });
+ return write_int(
+ out, num_digits, prefix, specs, [=](reserve_iterator<OutputIt> it) {
+ return format_uint<4, Char>(it, abs_value, num_digits, upper);
+ });
}
-
- void on_bin() {
- if (specs.alt) {
- prefix[prefix_size++] = '0';
- prefix[prefix_size++] = static_cast<char>(specs.type);
- }
+ 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);
- out = write_int(out, num_digits, get_prefix(), specs,
- [this, num_digits](iterator it) {
- return format_uint<1, Char>(it, abs_value, num_digits);
- });
+ return write_int(out, num_digits, prefix, specs,
+ [=](reserve_iterator<OutputIt> it) {
+ return format_uint<1, Char>(it, abs_value, num_digits);
+ });
}
-
- void on_oct() {
+ case presentation_type::oct: {
int num_digits = count_digits<3>(abs_value);
- if (specs.alt && specs.precision <= num_digits && abs_value != 0) {
- // Octal prefix '0' is counted as a digit, so only add it if precision
- // is not greater than the number of digits.
- prefix[prefix_size++] = '0';
- }
- out = write_int(out, num_digits, get_prefix(), specs,
- [this, num_digits](iterator it) {
- return format_uint<3, Char>(it, abs_value, num_digits);
- });
- }
-
- enum { sep_size = 1 };
-
- void on_num() {
- std::string groups = grouping<Char>(locale);
- if (groups.empty()) return on_dec();
- auto sep = thousands_sep<Char>(locale);
- if (!sep) return on_dec();
- int num_digits = count_digits(abs_value);
- int size = num_digits, n = num_digits;
- std::string::const_iterator group = groups.cbegin();
- while (group != groups.cend() && n > *group && *group > 0 &&
- *group != max_value<char>()) {
- size += sep_size;
- n -= *group;
- ++group;
- }
- if (group == groups.cend()) size += sep_size * ((n - 1) / groups.back());
- char digits[40];
- format_decimal(digits, abs_value, num_digits);
- basic_memory_buffer<Char> buffer;
- size += static_cast<int>(prefix_size);
- const auto usize = to_unsigned(size);
- buffer.resize(usize);
- basic_string_view<Char> s(&sep, sep_size);
- // Index of a decimal digit with the least significant digit having index 0.
- int digit_index = 0;
- group = groups.cbegin();
- auto p = buffer.data() + size - 1;
- for (int i = num_digits - 1; i > 0; --i) {
- *p-- = static_cast<Char>(digits[i]);
- if (*group <= 0 || ++digit_index % *group != 0 ||
- *group == max_value<char>())
- continue;
- if (group + 1 != groups.cend()) {
- digit_index = 0;
- ++group;
- }
- std::uninitialized_copy(s.data(), s.data() + s.size(),
- make_checked(p, s.size()));
- p -= s.size();
- }
- *p-- = static_cast<Char>(*digits);
- if (prefix_size != 0) *p = static_cast<Char>('-');
- auto data = buffer.data();
- out = write_padded<align::right>(
- out, specs, usize, usize,
- [=](iterator it) { return copy_str<Char>(data, data + size, it); });
+ // 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<OutputIt> it) {
+ return format_uint<3, Char>(it, abs_value, num_digits);
+ });
+ }
+ case presentation_type::chr:
+ return write_char(out, static_cast<Char>(abs_value), specs);
+ default:
+ throw_format_error("invalid type specifier");
}
+ return out;
+}
+template <typename Char, typename OutputIt, typename T>
+FMT_CONSTEXPR FMT_NOINLINE auto write_int_noinline(
+ OutputIt out, write_int_arg<T> arg, const basic_format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ return write_int(out, arg, specs, loc);
+}
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_integral<T>::value &&
+ !std::is_same<T, bool>::value &&
+ std::is_same<OutputIt, buffer_appender<Char>>::value)>
+FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value,
+ const basic_format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ 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 <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_integral<T>::value &&
+ !std::is_same<T, bool>::value &&
+ !std::is_same<OutputIt, buffer_appender<Char>>::value)>
+FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value,
+ const basic_format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ 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 <typename T> void operator=(const T&) {}
+ };
- void on_chr() { *out++ = static_cast<Char>(abs_value); }
+ counting_iterator() : count_(0) {}
+
+ size_t count() const { return count_; }
- FMT_NORETURN void on_error() {
- FMT_THROW(format_error("invalid type specifier"));
+ counting_iterator& operator++() {
+ ++count_;
+ return *this;
+ }
+ counting_iterator operator++(int) {
+ auto it = *this;
+ ++*this;
+ return it;
}
+
+ friend counting_iterator operator+(counting_iterator it, difference_type n) {
+ it.count_ += static_cast<size_t>(n);
+ return it;
+ }
+
+ value_type operator*() const { return {}; }
};
template <typename Char, typename OutputIt>
-OutputIt write_nonfinite(OutputIt out, bool isinf,
- const basic_format_specs<Char>& specs,
- const float_specs& fspecs) {
+FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> s,
+ const basic_format_specs<Char>& 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<Char>(data, size));
+ }
+ return write_padded(out, specs, size, width,
+ [=](reserve_iterator<OutputIt> it) {
+ if (is_debug) return write_escaped_string(it, s);
+ return copy_str<Char>(data, data + size, it);
+ });
+}
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out,
+ basic_string_view<type_identity_t<Char>> s,
+ const basic_format_specs<Char>& specs, locale_ref)
+ -> OutputIt {
+ check_string_type_spec(specs.type);
+ return write(out, s, specs);
+}
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, const Char* s,
+ const basic_format_specs<Char>& specs, locale_ref)
+ -> OutputIt {
+ return check_cstring_type_spec(specs.type)
+ ? write(out, basic_string_view<Char>(s), specs, {})
+ : write_ptr<Char>(out, bit_cast<uintptr_t>(s), &specs);
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_integral<T>::value &&
+ !std::is_same<T, bool>::value &&
+ !std::is_same<T, Char>::value)>
+FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt {
+ auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(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<size_t>(num_digits);
+ auto it = reserve(out, size);
+ if (auto ptr = to_pointer<Char>(it, size)) {
+ if (negative) *ptr++ = static_cast<Char>('-');
+ format_decimal<Char>(ptr, abs_value, num_digits);
+ return out;
+ }
+ if (negative) *it++ = static_cast<Char>('-');
+ it = format_decimal<Char>(it, abs_value, num_digits).end;
+ return base_iterator(out, it);
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR20 auto write_nonfinite(OutputIt out, bool isnan,
+ basic_format_specs<Char> specs,
+ const float_specs& fspecs) -> OutputIt {
auto str =
- isinf ? (fspecs.upper ? "INF" : "inf") : (fspecs.upper ? "NAN" : "nan");
+ 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);
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
- return write_padded(out, specs, size, [=](iterator it) {
- if (sign) *it++ = static_cast<Char>(data::signs[sign]);
+ // Replace '0'-padding with space for non-finite values.
+ const bool is_zero_fill =
+ specs.fill.size() == 1 && *specs.fill.data() == static_cast<Char>('0');
+ if (is_zero_fill) specs.fill[0] = static_cast<Char>(' ');
+ return write_padded(out, specs, size, [=](reserve_iterator<OutputIt> it) {
+ if (sign) *it++ = detail::sign<Char>(sign);
return copy_str<Char>(str, str + str_size, it);
});
}
@@ -1738,76 +2234,120 @@ struct big_decimal_fp {
int exponent;
};
-inline int get_significand_size(const big_decimal_fp& fp) {
- return fp.significand_size;
+constexpr auto get_significand_size(const big_decimal_fp& f) -> int {
+ return f.significand_size;
}
template <typename T>
-inline int get_significand_size(const dragonbox::decimal_fp<T>& fp) {
- return count_digits(fp.significand);
+inline auto get_significand_size(const dragonbox::decimal_fp<T>& f) -> int {
+ return count_digits(f.significand);
}
template <typename Char, typename OutputIt>
-inline OutputIt write_significand(OutputIt out, const char* significand,
- int& significand_size) {
+constexpr auto write_significand(OutputIt out, const char* significand,
+ int significand_size) -> OutputIt {
return copy_str<Char>(significand, significand + significand_size, out);
}
template <typename Char, typename OutputIt, typename UInt>
-inline OutputIt write_significand(OutputIt out, UInt significand,
- int significand_size) {
+inline auto write_significand(OutputIt out, UInt significand,
+ int significand_size) -> OutputIt {
return format_decimal<Char>(out, significand, significand_size).end;
}
+template <typename Char, typename OutputIt, typename T, typename Grouping>
+FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand,
+ int significand_size, int exponent,
+ const Grouping& grouping) -> OutputIt {
+ if (!grouping.separator()) {
+ out = write_significand<Char>(out, significand, significand_size);
+ return detail::fill_n(out, exponent, static_cast<Char>('0'));
+ }
+ auto buffer = memory_buffer();
+ write_significand<char>(appender(buffer), significand, significand_size);
+ detail::fill_n(appender(buffer), exponent, '0');
+ return grouping.apply(out, string_view(buffer.data(), buffer.size()));
+}
template <typename Char, typename UInt,
FMT_ENABLE_IF(std::is_integral<UInt>::value)>
-inline Char* write_significand(Char* out, UInt significand,
- int significand_size, int integral_size,
- Char decimal_point) {
+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;
- auto end = format_decimal(out + 1, significand, significand_size).end;
- if (integral_size == 1)
- out[0] = out[1];
- else
- std::copy_n(out + 1, integral_size, out);
- out[integral_size] = decimal_point;
+ 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<std::size_t>(significand % 100)));
+ significand /= 100;
+ }
+ if (floating_size % 2 != 0) {
+ *--out = static_cast<Char>('0' + significand % 10);
+ significand /= 10;
+ }
+ *--out = decimal_point;
+ format_decimal(out - integral_size, significand, integral_size);
return end;
}
template <typename OutputIt, typename UInt, typename Char,
FMT_ENABLE_IF(!std::is_pointer<remove_cvref_t<OutputIt>>::value)>
-inline OutputIt write_significand(OutputIt out, UInt significand,
- int significand_size, int integral_size,
- Char decimal_point) {
+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<UInt>() + 2];
auto end = write_significand(buffer, significand, significand_size,
integral_size, decimal_point);
- return detail::copy_str<Char>(buffer, end, out);
+ return detail::copy_str_noinline<Char>(buffer, end, out);
}
template <typename OutputIt, typename Char>
-inline OutputIt write_significand(OutputIt out, const char* significand,
- int significand_size, int integral_size,
- Char decimal_point) {
- out = detail::copy_str<Char>(significand, significand + integral_size, out);
+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<Char>(significand,
+ significand + integral_size, out);
if (!decimal_point) return out;
*out++ = decimal_point;
- return detail::copy_str<Char>(significand + integral_size,
- significand + significand_size, out);
+ return detail::copy_str_noinline<Char>(significand + integral_size,
+ significand + significand_size, out);
}
-template <typename OutputIt, typename DecimalFP, typename Char>
-OutputIt write_float(OutputIt out, const DecimalFP& fp,
- const basic_format_specs<Char>& specs, float_specs fspecs,
- Char decimal_point) {
- auto significand = fp.significand;
- int significand_size = get_significand_size(fp);
- static const Char zero = static_cast<Char>('0');
+template <typename OutputIt, typename Char, typename T, typename Grouping>
+FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand,
+ int significand_size, int integral_size,
+ Char decimal_point,
+ const Grouping& grouping) -> OutputIt {
+ if (!grouping.separator()) {
+ return write_significand(out, significand, significand_size, integral_size,
+ decimal_point);
+ }
+ auto buffer = basic_memory_buffer<Char>();
+ write_significand(buffer_appender<Char>(buffer), significand,
+ significand_size, integral_size, decimal_point);
+ grouping.apply(
+ out, basic_string_view<Char>(buffer.data(), to_unsigned(integral_size)));
+ return detail::copy_str_noinline<Char>(buffer.data() + integral_size,
+ buffer.end(), out);
+}
+
+template <typename OutputIt, typename DecimalFP, typename Char,
+ typename Grouping = digit_grouping<Char>>
+FMT_CONSTEXPR20 auto do_write_float(OutputIt out, const DecimalFP& f,
+ const basic_format_specs<Char>& specs,
+ float_specs fspecs, locale_ref loc)
+ -> OutputIt {
+ auto significand = f.significand;
+ int significand_size = get_significand_size(f);
+ const Char zero = static_cast<Char>('0');
auto sign = fspecs.sign;
size_t size = to_unsigned(significand_size) + (sign ? 1 : 0);
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
+ using iterator = reserve_iterator<OutputIt>;
+
+ Char decimal_point =
+ fspecs.locale ? detail::decimal_point<Char>(loc) : static_cast<Char>('.');
- int output_exp = fp.exponent + significand_size - 1;
+ 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;
@@ -1820,7 +2360,8 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
if (use_exp_format()) {
int num_zeros = 0;
if (fspecs.showpoint) {
- num_zeros = (std::max)(fspecs.precision - significand_size, 0);
+ 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();
@@ -1832,11 +2373,11 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
size += to_unsigned((decimal_point ? 1 : 0) + 2 + exp_digits);
char exp_char = fspecs.upper ? 'E' : 'e';
auto write = [=](iterator it) {
- if (sign) *it++ = static_cast<Char>(data::signs[sign]);
+ if (sign) *it++ = detail::sign<Char>(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 = std::fill_n(it, num_zeros, zero);
+ if (num_zeros > 0) it = detail::fill_n(it, num_zeros, zero);
*it++ = static_cast<Char>(exp_char);
return write_exponent<Char>(output_exp, it);
};
@@ -1844,36 +2385,38 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
: base_iterator(out, write(reserve(out, size)));
}
- int exp = fp.exponent + significand_size;
- if (fp.exponent >= 0) {
+ int exp = f.exponent + significand_size;
+ if (f.exponent >= 0) {
// 1234e5 -> 123400000[.0+]
- size += to_unsigned(fp.exponent);
+ size += to_unsigned(f.exponent);
int num_zeros = fspecs.precision - exp;
-#ifdef FMT_FUZZ
- if (num_zeros > 5000)
- throw std::runtime_error("fuzz mode - avoiding excessive cpu use");
-#endif
+ abort_fuzzing_if(num_zeros > 5000);
if (fspecs.showpoint) {
+ ++size;
if (num_zeros <= 0 && fspecs.format != float_format::fixed) num_zeros = 1;
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<align::right>(out, specs, size, [&](iterator it) {
- if (sign) *it++ = static_cast<Char>(data::signs[sign]);
- it = write_significand<Char>(it, significand, significand_size);
- it = std::fill_n(it, fp.exponent, zero);
+ if (sign) *it++ = detail::sign<Char>(sign);
+ it = write_significand<Char>(it, significand, significand_size,
+ f.exponent, grouping);
if (!fspecs.showpoint) return it;
*it++ = decimal_point;
- return num_zeros > 0 ? std::fill_n(it, num_zeros, zero) : it;
+ 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(significand_size));
return write_padded<align::right>(out, specs, size, [&](iterator it) {
- if (sign) *it++ = static_cast<Char>(data::signs[sign]);
+ if (sign) *it++ = detail::sign<Char>(sign);
it = write_significand(it, significand, significand_size, exp,
- decimal_point);
- return num_zeros > 0 ? std::fill_n(it, num_zeros, zero) : it;
+ decimal_point, grouping);
+ return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it;
});
}
// 1234e-6 -> 0.001234
@@ -1882,37 +2425,759 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
fspecs.precision < num_zeros) {
num_zeros = fspecs.precision;
}
- size += 2 + to_unsigned(num_zeros);
+ bool pointy = num_zeros != 0 || significand_size != 0 || fspecs.showpoint;
+ size += 1 + (pointy ? 1 : 0) + to_unsigned(num_zeros);
return write_padded<align::right>(out, specs, size, [&](iterator it) {
- if (sign) *it++ = static_cast<Char>(data::signs[sign]);
+ if (sign) *it++ = detail::sign<Char>(sign);
*it++ = zero;
- if (num_zeros == 0 && significand_size == 0 && !fspecs.showpoint) return it;
+ if (!pointy) return it;
*it++ = decimal_point;
- it = std::fill_n(it, num_zeros, zero);
+ it = detail::fill_n(it, num_zeros, zero);
return write_significand<Char>(it, significand, significand_size);
});
}
+template <typename Char> class fallback_digit_grouping {
+ public:
+ constexpr fallback_digit_grouping(locale_ref, bool) {}
+
+ constexpr Char separator() const { return Char(); }
+
+ constexpr int count_separators(int) const { return 0; }
+
+ template <typename Out, typename C>
+ constexpr Out apply(Out out, basic_string_view<C>) const {
+ return out;
+ }
+};
+
+template <typename OutputIt, typename DecimalFP, typename Char>
+FMT_CONSTEXPR20 auto write_float(OutputIt out, const DecimalFP& f,
+ const basic_format_specs<Char>& specs,
+ float_specs fspecs, locale_ref loc)
+ -> OutputIt {
+ if (is_constant_evaluated()) {
+ return do_write_float<OutputIt, DecimalFP, Char,
+ fallback_digit_grouping<Char>>(out, f, specs, fspecs,
+ loc);
+ } else {
+ return do_write_float(out, f, specs, fspecs, loc);
+ }
+}
+
+template <typename T> constexpr bool isnan(T value) {
+ return !(value >= value); // std::isnan doesn't support __float128.
+}
+
+template <typename T, typename Enable = void>
+struct has_isfinite : std::false_type {};
+
+template <typename T>
+struct has_isfinite<T, enable_if_t<sizeof(std::isfinite(T())) != 0>>
+ : std::true_type {};
+
+template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value&&
+ has_isfinite<T>::value)>
+FMT_CONSTEXPR20 bool isfinite(T value) {
+ constexpr T inf = T(std::numeric_limits<double>::infinity());
+ if (is_constant_evaluated())
+ return !detail::isnan(value) && value != inf && value != -inf;
+ return std::isfinite(value);
+}
+template <typename T, FMT_ENABLE_IF(!has_isfinite<T>::value)>
+FMT_CONSTEXPR bool isfinite(T value) {
+ T inf = T(std::numeric_limits<double>::infinity());
+ // std::isfinite doesn't support __float128.
+ return !detail::isnan(value) && value != inf && value != -inf;
+}
+
+template <typename T, FMT_ENABLE_IF(is_floating_point<T>::value)>
+FMT_INLINE FMT_CONSTEXPR bool signbit(T value) {
+ if (is_constant_evaluated()) {
+#ifdef __cpp_if_constexpr
+ if constexpr (std::numeric_limits<double>::is_iec559) {
+ auto bits = detail::bit_cast<uint64_t>(static_cast<double>(value));
+ return (bits >> (num_bits<uint64_t>() - 1)) != 0;
+ }
+#endif
+ }
+ return std::signbit(static_cast<double>(value));
+}
+
+enum class round_direction { unknown, up, down };
+
+// Given the divisor (normally a power of 10), the remainder = v % divisor for
+// some number v and the error, returns whether v should be rounded up, down, or
+// whether the rounding direction can't be determined due to error.
+// error should be less than divisor / 2.
+FMT_CONSTEXPR inline round_direction get_round_direction(uint64_t divisor,
+ uint64_t remainder,
+ uint64_t error) {
+ FMT_ASSERT(remainder < divisor, ""); // divisor - remainder won't overflow.
+ FMT_ASSERT(error < divisor, ""); // divisor - error won't overflow.
+ FMT_ASSERT(error < divisor - error, ""); // error * 2 won't overflow.
+ // Round down if (remainder + error) * 2 <= divisor.
+ if (remainder <= divisor - remainder && error * 2 <= divisor - remainder * 2)
+ return round_direction::down;
+ // Round up if (remainder - error) * 2 >= divisor.
+ if (remainder >= error &&
+ remainder - error >= divisor - (remainder - error)) {
+ return round_direction::up;
+ }
+ return round_direction::unknown;
+}
+
+namespace digits {
+enum result {
+ more, // Generate more digits.
+ done, // Done generating digits.
+ error // Digit generation cancelled due to an error.
+};
+}
+
+struct gen_digits_handler {
+ char* buf;
+ int size;
+ int precision;
+ int exp10;
+ bool fixed;
+
+ FMT_CONSTEXPR digits::result on_digit(char digit, uint64_t divisor,
+ uint64_t remainder, uint64_t error,
+ bool integral) {
+ FMT_ASSERT(remainder < divisor, "");
+ buf[size++] = digit;
+ if (!integral && error >= remainder) return digits::error;
+ if (size < precision) return digits::more;
+ if (!integral) {
+ // Check if error * 2 < divisor with overflow prevention.
+ // The check is not needed for the integral part because error = 1
+ // and divisor > (1 << 32) there.
+ if (error >= divisor || error >= divisor - error) return digits::error;
+ } else {
+ FMT_ASSERT(error == 1 && divisor > 2, "");
+ }
+ auto dir = get_round_direction(divisor, remainder, error);
+ if (dir != round_direction::up)
+ return dir == round_direction::down ? digits::done : digits::error;
+ ++buf[size - 1];
+ for (int i = size - 1; i > 0 && buf[i] > '9'; --i) {
+ buf[i] = '0';
+ ++buf[i - 1];
+ }
+ if (buf[0] > '9') {
+ buf[0] = '1';
+ if (fixed)
+ buf[size++] = '0';
+ else
+ ++exp10;
+ }
+ return digits::done;
+ }
+};
+
+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<int>() - exp10)
+ FMT_THROW(format_error("number is too big"));
+ precision += exp10;
+}
+
+// Generates output using the Grisu digit-gen algorithm.
+// error: the size of the region (lower, upper) outside of which numbers
+// definitely do not round to value (Delta in Grisu3).
+FMT_INLINE FMT_CONSTEXPR20 auto grisu_gen_digits(fp value, uint64_t error,
+ int& exp,
+ gen_digits_handler& handler)
+ -> digits::result {
+ const fp one(1ULL << -value.e, value.e);
+ // The integral part of scaled value (p1 in Grisu) = value / one. It cannot be
+ // zero because it contains a product of two 64-bit numbers with MSB set (due
+ // to normalization) - 1, shifted right by at most 60 bits.
+ auto integral = static_cast<uint32_t>(value.f >> -one.e);
+ FMT_ASSERT(integral != 0, "");
+ FMT_ASSERT(integral == value.f >> -one.e, "");
+ // The fractional part of scaled value (p2 in Grisu) c = value % one.
+ uint64_t fractional = value.f & (one.f - 1);
+ exp = count_digits(integral); // kappa in Grisu.
+ // Non-fixed formats require at least one digit and no precision adjustment.
+ if (handler.fixed) {
+ adjust_precision(handler.precision, exp + handler.exp10);
+ // Check if precision is satisfied just by leading zeros, e.g.
+ // format("{:.2f}", 0.001) gives "0.00" without generating any digits.
+ if (handler.precision <= 0) {
+ if (handler.precision < 0) return digits::done;
+ // Divide by 10 to prevent overflow.
+ uint64_t divisor = data::power_of_10_64[exp - 1] << -one.e;
+ auto dir = get_round_direction(divisor, value.f / 10, error * 10);
+ if (dir == round_direction::unknown) return digits::error;
+ handler.buf[handler.size++] = dir == round_direction::up ? '1' : '0';
+ return digits::done;
+ }
+ }
+ // Generate digits for the integral part. This can produce up to 10 digits.
+ do {
+ uint32_t digit = 0;
+ auto divmod_integral = [&](uint32_t divisor) {
+ digit = integral / divisor;
+ integral %= divisor;
+ };
+ // This optimization by Milo Yip reduces the number of integer divisions by
+ // one per iteration.
+ switch (exp) {
+ case 10:
+ divmod_integral(1000000000);
+ break;
+ case 9:
+ divmod_integral(100000000);
+ break;
+ case 8:
+ divmod_integral(10000000);
+ break;
+ case 7:
+ divmod_integral(1000000);
+ break;
+ case 6:
+ divmod_integral(100000);
+ break;
+ case 5:
+ divmod_integral(10000);
+ break;
+ case 4:
+ divmod_integral(1000);
+ break;
+ case 3:
+ divmod_integral(100);
+ break;
+ case 2:
+ divmod_integral(10);
+ break;
+ case 1:
+ digit = integral;
+ integral = 0;
+ break;
+ default:
+ FMT_ASSERT(false, "invalid number of digits");
+ }
+ --exp;
+ auto remainder = (static_cast<uint64_t>(integral) << -one.e) + fractional;
+ auto result = handler.on_digit(static_cast<char>('0' + digit),
+ data::power_of_10_64[exp] << -one.e,
+ remainder, error, true);
+ if (result != digits::more) return result;
+ } while (exp > 0);
+ // Generate digits for the fractional part.
+ for (;;) {
+ fractional *= 10;
+ error *= 10;
+ char digit = static_cast<char>('0' + (fractional >> -one.e));
+ fractional &= one.f - 1;
+ --exp;
+ auto result = handler.on_digit(digit, one.f, fractional, error, false);
+ if (result != digits::more) return result;
+ }
+}
+
+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<bigit, bigits_capacity> bigits_;
+ int exp_;
+
+ FMT_CONSTEXPR20 bigit operator[](int index) const {
+ return bigits_[to_unsigned(index)];
+ }
+ FMT_CONSTEXPR20 bigit& operator[](int index) {
+ return bigits_[to_unsigned(index)];
+ }
+
+ static constexpr const int bigit_bits = num_bits<bigit>();
+
+ friend struct formatter<bigint>;
+
+ FMT_CONSTEXPR20 void subtract_bigits(int index, bigit other, bigit& borrow) {
+ auto result = static_cast<double_bigit>((*this)[index]) - other - borrow;
+ (*this)[index] = static_cast<bigit>(result);
+ borrow = static_cast<bigit>(result >> (bigit_bits * 2 - 1));
+ }
+
+ FMT_CONSTEXPR20 void remove_leading_zeros() {
+ int num_bigits = static_cast<int>(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<bigit>(result);
+ carry = static_cast<bigit>(result >> bigit_bits);
+ }
+ if (carry != 0) bigits_.push_back(carry);
+ }
+
+ template <typename UInt, FMT_ENABLE_IF(std::is_same<UInt, uint64_t>::value ||
+ std::is_same<UInt, uint128_t>::value)>
+ FMT_CONSTEXPR20 void multiply(UInt value) {
+ using half_uint =
+ conditional_t<std::is_same<UInt, uint128_t>::value, uint64_t, uint32_t>;
+ const int shift = num_bits<half_uint>() - bigit_bits;
+ const UInt lower = static_cast<half_uint>(value);
+ const UInt upper = value >> num_bits<half_uint>();
+ UInt carry = 0;
+ for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
+ UInt result = lower * bigits_[i] + static_cast<bigit>(carry);
+ carry = (upper * bigits_[i] << shift) + (result >> bigit_bits) +
+ (carry >> bigit_bits);
+ bigits_[i] = static_cast<bigit>(result);
+ }
+ while (carry != 0) {
+ bigits_.push_back(static_cast<bigit>(carry));
+ carry >>= bigit_bits;
+ }
+ }
+
+ template <typename UInt, FMT_ENABLE_IF(std::is_same<UInt, uint64_t>::value ||
+ std::is_same<UInt, uint128_t>::value)>
+ FMT_CONSTEXPR20 void assign(UInt n) {
+ size_t num_bigits = 0;
+ do {
+ bigits_[num_bigits++] = static_cast<bigit>(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();
+ std::copy(data, data + size, make_checked(bigits_.data(), size));
+ exp_ = other.exp_;
+ }
+
+ template <typename Int> FMT_CONSTEXPR20 void operator=(Int n) {
+ FMT_ASSERT(n > 0, "");
+ assign(uint64_or_128_t<Int>(n));
+ }
+
+ FMT_CONSTEXPR20 int num_bigits() const {
+ return static_cast<int>(bigits_.size()) + exp_;
+ }
+
+ FMT_NOINLINE FMT_CONSTEXPR20 bigint& operator<<=(int shift) {
+ 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 <typename Int> FMT_CONSTEXPR20 bigint& operator*=(Int value) {
+ FMT_ASSERT(value > 0, "");
+ multiply(uint32_or_64_or_128_t<Int>(value));
+ return *this;
+ }
+
+ friend FMT_CONSTEXPR20 int compare(const bigint& lhs, const bigint& rhs) {
+ 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<int>(lhs.bigits_.size()) - 1;
+ int j = static_cast<int>(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 int add_compare(const bigint& lhs1, const bigint& lhs2,
+ const bigint& rhs) {
+ 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<double_bigit>(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<int>(bigits_.size());
+ int num_result_bigits = 2 * num_bigits;
+ basic_memory_buffer<bigit, bigits_capacity> 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<double_bigit>(n[i]) * n[j];
+ }
+ (*this)[bigit_index] = static_cast<bigit>(sum);
+ sum >>= num_bits<bigit>(); // 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<double_bigit>(n[i++]) * n[j--];
+ (*this)[bigit_index] = static_cast<bigit>(sum);
+ sum >>= num_bits<bigit>();
+ }
+ 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<int>(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, 0);
+ exp_ -= exp_difference;
+ }
+
+ // Divides this bignum by divisor, assigning the remainder to this and
+ // returning the quotient.
+ FMT_CONSTEXPR20 int divmod_assign(const bigint& divisor) {
+ 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<uint128_t> value,
+ unsigned flags, int num_digits,
+ buffer<char>& 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;
+ }
+ }
+ bool even = (value.f & 1) == 0;
+ if (!upper) upper = &lower;
+ 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 (num_digits < 0) {
+ // 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<char>('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<char>('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';
+ ++exp10;
+ }
+ return;
+ }
+ ++digit;
+ }
+ buf[num_digits - 1] = static_cast<char>('0' + digit);
+}
+
+template <typename Float>
+FMT_CONSTEXPR20 auto format_float(Float value, int precision, float_specs specs,
+ buffer<char>& buf) -> int {
+ // float is passed as double to reduce the number of instantiations.
+ static_assert(!std::is_same<Float, float>::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<Float>()) {
+ const auto inv_log2_10 = 0.3010299956639812; // 1 / log2(10)
+ using info = dragonbox::float_info<decltype(converted_value)>;
+ const auto f = basic_fp<typename info::carrier_uint>(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.
+ exp = static_cast<int>(
+ std::ceil((f.e + count_digits<1>(f.f) - 1) * inv_log2_10 - 1e-10));
+ dragon_flags = dragon::fixup;
+ } else if (!is_constant_evaluated() && precision < 0) {
+ // Use Dragonbox for the shortest format.
+ if (specs.binary32) {
+ auto dec = dragonbox::to_decimal(static_cast<float>(value));
+ write<char>(buffer_appender<char>(buf), dec.significand);
+ return dec.exponent;
+ }
+ auto dec = dragonbox::to_decimal(static_cast<double>(value));
+ write<char>(buffer_appender<char>(buf), dec.significand);
+ return dec.exponent;
+ } else {
+ // Use Grisu + Dragon4 for the given precision:
+ // https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf.
+ const int min_exp = -60; // alpha in Grisu.
+ int cached_exp10 = 0; // K in Grisu.
+ fp normalized = normalize(fp(converted_value));
+ const auto cached_pow = get_cached_power(
+ min_exp - (normalized.e + fp::num_significand_bits), cached_exp10);
+ normalized = normalized * cached_pow;
+ gen_digits_handler handler{buf.data(), 0, precision, -cached_exp10, fixed};
+ if (grisu_gen_digits(normalized, 1, exp, handler) != digits::error &&
+ !is_constant_evaluated()) {
+ exp += handler.exp10;
+ buf.try_resize(to_unsigned(handler.size));
+ use_dragon = false;
+ } else {
+ exp += handler.size - cached_exp10 - 1;
+ precision = handler.precision;
+ }
+ }
+ if (use_dragon) {
+ auto f = basic_fp<uint128_t>();
+ bool is_predecessor_closer = specs.binary32
+ ? f.assign(static_cast<float>(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 <typename Char, typename OutputIt, typename T,
- FMT_ENABLE_IF(std::is_floating_point<T>::value)>
-OutputIt write(OutputIt out, T value, basic_format_specs<Char> specs,
- locale_ref loc = {}) {
+ FMT_ENABLE_IF(is_floating_point<T>::value)>
+FMT_CONSTEXPR20 auto write(OutputIt out, T value,
+ basic_format_specs<Char> specs, locale_ref loc = {})
+ -> OutputIt {
if (const_check(!is_supported_floating_point(value))) return out;
float_specs fspecs = parse_float_type_spec(specs);
fspecs.sign = specs.sign;
- if (std::signbit(value)) { // value < 0 is false for NaN so use signbit.
+ 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 (!std::isfinite(value))
- return write_nonfinite(out, std::isinf(value), specs, fspecs);
+ 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++ = static_cast<Char>(data::signs[fspecs.sign]);
+ *it++ = detail::sign<Char>(fspecs.sign);
out = base_iterator(out, it);
fspecs.sign = sign::none;
if (specs.width != 0) --specs.width;
@@ -1920,468 +3185,204 @@ OutputIt write(OutputIt out, T value, basic_format_specs<Char> specs,
memory_buffer buffer;
if (fspecs.format == float_format::hex) {
- if (fspecs.sign) buffer.push_back(data::signs[fspecs.sign]);
- snprintf_float(promote_float(value), specs.precision, fspecs, buffer);
- return write_bytes(out, {buffer.data(), buffer.size()}, specs);
- }
- int precision = specs.precision >= 0 || !specs.type ? specs.precision : 6;
+ if (fspecs.sign) buffer.push_back(detail::sign<char>(fspecs.sign));
+ snprintf_float(convert_float(value), specs.precision, fspecs, buffer);
+ return write_bytes<align::right>(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<int>())
- FMT_THROW(format_error("number is too big"));
+ 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<T, float>())) fspecs.binary32 = true;
- fspecs.use_grisu = is_fast_float<T>();
- int exp = format_float(promote_float(value), precision, fspecs, buffer);
+ int exp = format_float(convert_float(value), precision, fspecs, buffer);
fspecs.precision = precision;
- Char point =
- fspecs.locale ? decimal_point<Char>(loc) : static_cast<Char>('.');
- auto fp = big_decimal_fp{buffer.data(), static_cast<int>(buffer.size()), exp};
- return write_float(out, fp, specs, fspecs, point);
+ auto f = big_decimal_fp{buffer.data(), static_cast<int>(buffer.size()), exp};
+ return write_float(out, f, specs, fspecs, loc);
}
template <typename Char, typename OutputIt, typename T,
FMT_ENABLE_IF(is_fast_float<T>::value)>
-OutputIt write(OutputIt out, T value) {
+FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt {
+ if (is_constant_evaluated())
+ return write(out, value, basic_format_specs<Char>());
if (const_check(!is_supported_floating_point(value))) return out;
- using floaty = conditional_t<std::is_same<T, long double>::value, double, T>;
- using uint = typename dragonbox::float_info<floaty>::carrier_uint;
- auto bits = bit_cast<uint>(value);
-
auto fspecs = float_specs();
- auto sign_bit = bits & (uint(1) << (num_bits<uint>() - 1));
- if (sign_bit != 0) {
+ if (detail::signbit(value)) {
fspecs.sign = sign::minus;
value = -value;
}
- static const auto specs = basic_format_specs<Char>();
+ constexpr auto specs = basic_format_specs<Char>();
+ using floaty = conditional_t<std::is_same<T, long double>::value, double, T>;
+ using uint = typename dragonbox::float_info<floaty>::carrier_uint;
uint mask = exponent_mask<floaty>();
- if ((bits & mask) == mask)
- return write_nonfinite(out, std::isinf(value), specs, fspecs);
+ if ((bit_cast<uint>(value) & mask) == mask)
+ return write_nonfinite(out, std::isnan(value), specs, fspecs);
auto dec = dragonbox::to_decimal(static_cast<floaty>(value));
- return write_float(out, dec, specs, fspecs, static_cast<Char>('.'));
+ return write_float(out, dec, specs, fspecs, {});
}
template <typename Char, typename OutputIt, typename T,
- FMT_ENABLE_IF(std::is_floating_point<T>::value &&
+ FMT_ENABLE_IF(is_floating_point<T>::value &&
!is_fast_float<T>::value)>
-inline OutputIt write(OutputIt out, T value) {
+inline auto write(OutputIt out, T value) -> OutputIt {
return write(out, value, basic_format_specs<Char>());
}
template <typename Char, typename OutputIt>
-OutputIt write_char(OutputIt out, Char value,
- const basic_format_specs<Char>& specs) {
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
- return write_padded(out, specs, 1, [=](iterator it) {
- *it++ = value;
- return it;
- });
-}
-
-template <typename Char, typename OutputIt, typename UIntPtr>
-OutputIt write_ptr(OutputIt out, UIntPtr value,
- const basic_format_specs<Char>* specs) {
- int num_digits = count_digits<4>(value);
- auto size = to_unsigned(num_digits) + size_t(2);
- using iterator = remove_reference_t<decltype(reserve(out, 0))>;
- auto write = [=](iterator it) {
- *it++ = static_cast<Char>('0');
- *it++ = static_cast<Char>('x');
- return format_uint<4, Char>(it, value, num_digits);
- };
- return specs ? write_padded<align::right>(out, *specs, size, write)
- : base_iterator(out, write(reserve(out, size)));
-}
-
-template <typename T> struct is_integral : std::is_integral<T> {};
-template <> struct is_integral<int128_t> : std::true_type {};
-template <> struct is_integral<uint128_t> : std::true_type {};
-
-template <typename Char, typename OutputIt>
-OutputIt write(OutputIt out, monostate) {
+auto write(OutputIt out, monostate, basic_format_specs<Char> = {},
+ locale_ref = {}) -> OutputIt {
FMT_ASSERT(false, "");
return out;
}
-template <typename Char, typename OutputIt,
- FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
-OutputIt write(OutputIt out, string_view value) {
- auto it = reserve(out, value.size());
- it = copy_str<Char>(value.begin(), value.end(), it);
- return base_iterator(out, it);
-}
-
template <typename Char, typename OutputIt>
-OutputIt write(OutputIt out, basic_string_view<Char> value) {
+FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> value)
+ -> OutputIt {
auto it = reserve(out, value.size());
- it = std::copy(value.begin(), value.end(), it);
+ it = copy_str_noinline<Char>(value.begin(), value.end(), it);
return base_iterator(out, it);
}
-template <typename Char>
-buffer_appender<Char> write(buffer_appender<Char> out,
- basic_string_view<Char> value) {
- get_container(out).append(value.begin(), value.end());
- return out;
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_string<T>::value)>
+constexpr auto write(OutputIt out, const T& value) -> OutputIt {
+ return write<Char>(out, to_string_view(value));
}
-template <typename Char, typename OutputIt, typename T,
- FMT_ENABLE_IF(is_integral<T>::value &&
- !std::is_same<T, bool>::value &&
- !std::is_same<T, Char>::value)>
-OutputIt write(OutputIt out, T value) {
- auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(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<size_t>(num_digits);
- auto it = reserve(out, size);
- if (auto ptr = to_pointer<Char>(it, size)) {
- if (negative) *ptr++ = static_cast<Char>('-');
- format_decimal<Char>(ptr, abs_value, num_digits);
- return out;
- }
- if (negative) *it++ = static_cast<Char>('-');
- it = format_decimal<Char>(it, abs_value, num_digits).end;
- return base_iterator(out, it);
+// FMT_ENABLE_IF() condition separated to workaround an MSVC bug.
+template <
+ typename Char, typename OutputIt, typename T,
+ bool check =
+ std::is_enum<T>::value && !std::is_same<T, Char>::value &&
+ mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value !=
+ type::custom_type,
+ FMT_ENABLE_IF(check)>
+FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt {
+ return write<Char>(out, static_cast<underlying_t<T>>(value));
}
-template <typename Char, typename OutputIt>
-OutputIt write(OutputIt out, bool value) {
- return write<Char>(out, string_view(value ? "true" : "false"));
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(std::is_same<T, bool>::value)>
+FMT_CONSTEXPR auto write(OutputIt out, T value,
+ const basic_format_specs<Char>& 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 <typename Char, typename OutputIt>
-OutputIt write(OutputIt out, Char value) {
+FMT_CONSTEXPR auto write(OutputIt out, Char value) -> OutputIt {
auto it = reserve(out, 1);
*it++ = value;
return base_iterator(out, it);
}
template <typename Char, typename OutputIt>
-OutputIt write(OutputIt out, const Char* value) {
+FMT_CONSTEXPR_CHAR_TRAITS auto write(OutputIt out, const Char* value)
+ -> OutputIt {
if (!value) {
- FMT_THROW(format_error("string pointer is null"));
+ throw_format_error("string pointer is null");
} else {
- auto length = std::char_traits<Char>::length(value);
- out = write(out, basic_string_view<Char>(value, length));
+ out = write(out, basic_string_view<Char>(value));
}
return out;
}
-template <typename Char, typename OutputIt>
-OutputIt write(OutputIt out, const void* value) {
- return write_ptr<Char>(out, to_uintptr(value), nullptr);
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(std::is_same<T, void>::value)>
+auto write(OutputIt out, const T* value,
+ const basic_format_specs<Char>& specs = {}, locale_ref = {})
+ -> OutputIt {
+ check_pointer_type_spec(specs.type, error_handler());
+ return write_ptr<Char>(out, bit_cast<uintptr_t>(value), &specs);
}
-template <typename Char, typename OutputIt, typename T>
-auto write(OutputIt out, const T& value) -> typename std::enable_if<
- mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value ==
- type::custom_type,
- OutputIt>::type {
- using context_type = basic_format_context<OutputIt, Char>;
+// A write overload that handles implicit conversions.
+template <typename Char, typename OutputIt, typename T,
+ typename Context = basic_format_context<OutputIt, Char>>
+FMT_CONSTEXPR auto write(OutputIt out, const T& value) -> enable_if_t<
+ std::is_class<T>::value && !is_string<T>::value &&
+ !is_floating_point<T>::value && !std::is_same<T, Char>::value &&
+ !std::is_same<const T&,
+ decltype(arg_mapper<Context>().map(value))>::value,
+ OutputIt> {
+ return write<Char>(out, arg_mapper<Context>().map(value));
+}
+
+template <typename Char, typename OutputIt, typename T,
+ typename Context = basic_format_context<OutputIt, Char>>
+FMT_CONSTEXPR auto write(OutputIt out, const T& value)
+ -> enable_if_t<mapped_type_constant<T, Context>::value == type::custom_type,
+ OutputIt> {
using formatter_type =
- conditional_t<has_formatter<T, context_type>::value,
- typename context_type::template formatter_type<T>,
+ conditional_t<has_formatter<T, Context>::value,
+ typename Context::template formatter_type<T>,
fallback_formatter<T, Char>>;
- context_type ctx(out, {}, {});
+ auto ctx = Context(out, {}, {});
return formatter_type().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 <typename OutputIt, typename Char> struct default_arg_formatter {
- using context = basic_format_context<OutputIt, Char>;
+template <typename Char> struct default_arg_formatter {
+ using iterator = buffer_appender<Char>;
+ using context = buffer_context<Char>;
- OutputIt out;
+ iterator out;
basic_format_args<context> args;
locale_ref loc;
- template <typename T> OutputIt operator()(T value) {
+ template <typename T> auto operator()(T value) -> iterator {
return write<Char>(out, value);
}
-
- OutputIt operator()(typename basic_format_arg<context>::handle handle) {
+ auto operator()(typename basic_format_arg<context>::handle h) -> iterator {
basic_format_parse_context<Char> parse_ctx({});
- basic_format_context<OutputIt, Char> format_ctx(out, args, loc);
- handle.format(parse_ctx, format_ctx);
+ context format_ctx(out, args, loc);
+ h.format(parse_ctx, format_ctx);
return format_ctx.out();
}
};
-template <typename OutputIt, typename Char,
- typename ErrorHandler = error_handler>
-class arg_formatter_base {
- public:
- using iterator = OutputIt;
- using char_type = Char;
- using format_specs = basic_format_specs<Char>;
-
- private:
- iterator out_;
- locale_ref locale_;
- format_specs* specs_;
-
- // Attempts to reserve space for n extra characters in the output range.
- // Returns a pointer to the reserved range or a reference to out_.
- auto reserve(size_t n) -> decltype(detail::reserve(out_, n)) {
- return detail::reserve(out_, n);
- }
-
- using reserve_iterator = remove_reference_t<decltype(
- detail::reserve(std::declval<iterator&>(), 0))>;
-
- template <typename T> void write_int(T value, const format_specs& spec) {
- using uint_type = uint32_or_64_or_128_t<T>;
- int_writer<iterator, Char, uint_type> w(out_, locale_, value, spec);
- handle_int_type_spec(spec.type, w);
- out_ = w.out;
- }
-
- void write(char value) {
- auto&& it = reserve(1);
- *it++ = value;
- }
-
- template <typename Ch, FMT_ENABLE_IF(std::is_same<Ch, Char>::value)>
- void write(Ch value) {
- out_ = detail::write<Char>(out_, value);
- }
-
- void write(string_view value) {
- auto&& it = reserve(value.size());
- it = copy_str<Char>(value.begin(), value.end(), it);
- }
- void write(wstring_view value) {
- static_assert(std::is_same<Char, wchar_t>::value, "");
- auto&& it = reserve(value.size());
- it = std::copy(value.begin(), value.end(), it);
- }
-
- template <typename Ch>
- void write(const Ch* s, size_t size, const format_specs& specs) {
- auto width = specs.width != 0
- ? count_code_points(basic_string_view<Ch>(s, size))
- : 0;
- out_ = write_padded(out_, specs, size, width, [=](reserve_iterator it) {
- return copy_str<Char>(s, s + size, it);
- });
- }
-
- template <typename Ch>
- void write(basic_string_view<Ch> s, const format_specs& specs = {}) {
- out_ = detail::write(out_, s, specs);
- }
-
- void write_pointer(const void* p) {
- out_ = write_ptr<char_type>(out_, to_uintptr(p), specs_);
- }
-
- struct char_spec_handler : ErrorHandler {
- arg_formatter_base& formatter;
- Char value;
-
- char_spec_handler(arg_formatter_base& f, Char val)
- : formatter(f), value(val) {}
-
- void on_int() {
- // char is only formatted as int if there are specs.
- formatter.write_int(static_cast<int>(value), *formatter.specs_);
- }
- void on_char() {
- if (formatter.specs_)
- formatter.out_ = write_char(formatter.out_, value, *formatter.specs_);
- else
- formatter.write(value);
- }
- };
-
- struct cstring_spec_handler : error_handler {
- arg_formatter_base& formatter;
- const Char* value;
-
- cstring_spec_handler(arg_formatter_base& f, const Char* val)
- : formatter(f), value(val) {}
-
- void on_string() { formatter.write(value); }
- void on_pointer() { formatter.write_pointer(value); }
- };
-
- protected:
- iterator out() { return out_; }
- format_specs* specs() { return specs_; }
-
- void write(bool value) {
- if (specs_)
- write(string_view(value ? "true" : "false"), *specs_);
- else
- out_ = detail::write<Char>(out_, value);
- }
-
- void write(const Char* value) {
- if (!value) {
- FMT_THROW(format_error("string pointer is null"));
- } else {
- auto length = std::char_traits<char_type>::length(value);
- basic_string_view<char_type> sv(value, length);
- specs_ ? write(sv, *specs_) : write(sv);
- }
- }
-
- public:
- arg_formatter_base(OutputIt out, format_specs* s, locale_ref loc)
- : out_(out), locale_(loc), specs_(s) {}
-
- iterator operator()(monostate) {
- FMT_ASSERT(false, "invalid argument type");
- return out_;
- }
-
- template <typename T, FMT_ENABLE_IF(is_integral<T>::value)>
- FMT_INLINE iterator operator()(T value) {
- if (specs_)
- write_int(value, *specs_);
- else
- out_ = detail::write<Char>(out_, value);
- return out_;
- }
-
- iterator operator()(Char value) {
- handle_char_specs(specs_,
- char_spec_handler(*this, static_cast<Char>(value)));
- return out_;
- }
-
- iterator operator()(bool value) {
- if (specs_ && specs_->type) return (*this)(value ? 1 : 0);
- write(value != 0);
- return out_;
- }
-
- template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
- iterator operator()(T value) {
- auto specs = specs_ ? *specs_ : format_specs();
- if (const_check(is_supported_floating_point(value)))
- out_ = detail::write(out_, value, specs, locale_);
- else
- FMT_ASSERT(false, "unsupported float argument type");
- return out_;
- }
+template <typename Char> struct arg_formatter {
+ using iterator = buffer_appender<Char>;
+ using context = buffer_context<Char>;
- iterator operator()(const Char* value) {
- if (!specs_) return write(value), out_;
- handle_cstring_type_spec(specs_->type, cstring_spec_handler(*this, value));
- return out_;
- }
-
- iterator operator()(basic_string_view<Char> value) {
- if (specs_) {
- check_string_type_spec(specs_->type, error_handler());
- write(value, *specs_);
- } else {
- write(value);
- }
- return out_;
- }
+ iterator out;
+ const basic_format_specs<Char>& specs;
+ locale_ref locale;
- iterator operator()(const void* value) {
- if (specs_) check_pointer_type_spec(specs_->type, error_handler());
- write_pointer(value);
- return out_;
+ template <typename T>
+ FMT_CONSTEXPR FMT_INLINE auto operator()(T value) -> iterator {
+ return detail::write(out, value, specs, locale);
}
-};
-
-/** The default argument formatter. */
-template <typename OutputIt, typename Char>
-class arg_formatter : public arg_formatter_base<OutputIt, Char> {
- private:
- using char_type = Char;
- using base = arg_formatter_base<OutputIt, Char>;
- using context_type = basic_format_context<OutputIt, Char>;
-
- context_type& ctx_;
- basic_format_parse_context<char_type>* parse_ctx_;
- const Char* ptr_;
-
- public:
- using iterator = typename base::iterator;
- using format_specs = typename base::format_specs;
-
- /**
- \rst
- Constructs an argument formatter object.
- *ctx* is a reference to the formatting context,
- *specs* contains format specifier information for standard argument types.
- \endrst
- */
- explicit arg_formatter(
- context_type& ctx,
- basic_format_parse_context<char_type>* parse_ctx = nullptr,
- format_specs* specs = nullptr, const Char* ptr = nullptr)
- : base(ctx.out(), specs, ctx.locale()),
- ctx_(ctx),
- parse_ctx_(parse_ctx),
- ptr_(ptr) {}
-
- using base::operator();
-
- /** Formats an argument of a user-defined type. */
- iterator operator()(typename basic_format_arg<context_type>::handle handle) {
- if (ptr_) advance_to(*parse_ctx_, ptr_);
- handle.format(*parse_ctx_, ctx_);
- return ctx_.out();
+ auto operator()(typename basic_format_arg<context>::handle) -> iterator {
+ // User-defined types are handled separately because they require access
+ // to the parse context.
+ return out;
}
};
-template <typename Char> FMT_CONSTEXPR bool is_name_start(Char c) {
- return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || '_' == c;
-}
-
-// 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 <typename Char, typename ErrorHandler>
-FMT_CONSTEXPR int parse_nonnegative_int(const Char*& begin, const Char* end,
- ErrorHandler&& eh) {
- FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', "");
- unsigned value = 0;
- // Convert to unsigned to prevent a warning.
- constexpr unsigned max_int = max_value<int>();
- unsigned big = max_int / 10;
- do {
- // Check for overflow.
- if (value > big) {
- value = max_int + 1;
- break;
- }
- value = value * 10 + unsigned(*begin - '0');
- ++begin;
- } while (begin != end && '0' <= *begin && *begin <= '9');
- if (value > max_int) eh.on_error("number is too big");
- return static_cast<int>(value);
-}
-
-template <typename Context> class custom_formatter {
- private:
- using char_type = typename Context::char_type;
-
- basic_format_parse_context<char_type>& parse_ctx_;
- Context& ctx_;
-
- public:
- explicit custom_formatter(basic_format_parse_context<char_type>& parse_ctx,
- Context& ctx)
- : parse_ctx_(parse_ctx), ctx_(ctx) {}
+template <typename Char> struct custom_formatter {
+ basic_format_parse_context<Char>& parse_ctx;
+ buffer_context<Char>& ctx;
- void operator()(typename basic_format_arg<Context>::handle h) const {
- h.format(parse_ctx_, ctx_);
+ void operator()(
+ typename basic_format_arg<buffer_context<Char>>::handle h) const {
+ h.format(parse_ctx, ctx);
}
-
template <typename T> void operator()(T) const {}
};
@@ -2396,13 +3397,13 @@ template <typename ErrorHandler> class width_checker {
explicit FMT_CONSTEXPR width_checker(ErrorHandler& eh) : handler_(eh) {}
template <typename T, FMT_ENABLE_IF(is_integer<T>::value)>
- FMT_CONSTEXPR unsigned long long operator()(T value) {
+ FMT_CONSTEXPR auto operator()(T value) -> unsigned long long {
if (is_negative(value)) handler_.on_error("negative width");
return static_cast<unsigned long long>(value);
}
template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)>
- FMT_CONSTEXPR unsigned long long operator()(T) {
+ FMT_CONSTEXPR auto operator()(T) -> unsigned long long {
handler_.on_error("width is not integer");
return 0;
}
@@ -2416,13 +3417,13 @@ template <typename ErrorHandler> class precision_checker {
explicit FMT_CONSTEXPR precision_checker(ErrorHandler& eh) : handler_(eh) {}
template <typename T, FMT_ENABLE_IF(is_integer<T>::value)>
- FMT_CONSTEXPR unsigned long long operator()(T value) {
+ FMT_CONSTEXPR auto operator()(T value) -> unsigned long long {
if (is_negative(value)) handler_.on_error("negative precision");
return static_cast<unsigned long long>(value);
}
template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)>
- FMT_CONSTEXPR unsigned long long operator()(T) {
+ FMT_CONSTEXPR auto operator()(T) -> unsigned long long {
handler_.on_error("precision is not integer");
return 0;
}
@@ -2431,904 +3432,195 @@ template <typename ErrorHandler> class precision_checker {
ErrorHandler& handler_;
};
-// A format specifier handler that sets fields in basic_format_specs.
-template <typename Char> class specs_setter {
- public:
- explicit FMT_CONSTEXPR specs_setter(basic_format_specs<Char>& specs)
- : specs_(specs) {}
-
- FMT_CONSTEXPR specs_setter(const specs_setter& other)
- : specs_(other.specs_) {}
-
- FMT_CONSTEXPR void on_align(align_t align) { specs_.align = align; }
- FMT_CONSTEXPR void on_fill(basic_string_view<Char> fill) {
- specs_.fill = fill;
- }
- FMT_CONSTEXPR void on_plus() { specs_.sign = sign::plus; }
- FMT_CONSTEXPR void on_minus() { specs_.sign = sign::minus; }
- FMT_CONSTEXPR void on_space() { specs_.sign = sign::space; }
- FMT_CONSTEXPR void on_hash() { specs_.alt = true; }
-
- FMT_CONSTEXPR void on_zero() {
- specs_.align = align::numeric;
- specs_.fill[0] = Char('0');
- }
-
- FMT_CONSTEXPR void on_width(int width) { specs_.width = width; }
- FMT_CONSTEXPR void on_precision(int precision) {
- specs_.precision = precision;
- }
- FMT_CONSTEXPR void end_precision() {}
-
- FMT_CONSTEXPR void on_type(Char type) {
- specs_.type = static_cast<char>(type);
- }
-
- protected:
- basic_format_specs<Char>& specs_;
-};
-
-template <typename ErrorHandler> class numeric_specs_checker {
- public:
- FMT_CONSTEXPR numeric_specs_checker(ErrorHandler& eh, detail::type arg_type)
- : error_handler_(eh), arg_type_(arg_type) {}
-
- FMT_CONSTEXPR void require_numeric_argument() {
- if (!is_arithmetic_type(arg_type_))
- error_handler_.on_error("format specifier requires numeric argument");
- }
-
- FMT_CONSTEXPR void check_sign() {
- require_numeric_argument();
- if (is_integral_type(arg_type_) && arg_type_ != type::int_type &&
- arg_type_ != type::long_long_type && arg_type_ != type::char_type) {
- error_handler_.on_error("format specifier requires signed argument");
- }
- }
-
- FMT_CONSTEXPR void check_precision() {
- if (is_integral_type(arg_type_) || arg_type_ == type::pointer_type)
- error_handler_.on_error("precision not allowed for this argument type");
- }
-
- private:
- ErrorHandler& error_handler_;
- detail::type arg_type_;
-};
-
-// A format specifier handler that checks if specifiers are consistent with the
-// argument type.
-template <typename Handler> class specs_checker : public Handler {
- private:
- numeric_specs_checker<Handler> checker_;
-
- // Suppress an MSVC warning about using this in initializer list.
- FMT_CONSTEXPR Handler& error_handler() { return *this; }
-
- public:
- FMT_CONSTEXPR specs_checker(const Handler& handler, detail::type arg_type)
- : Handler(handler), checker_(error_handler(), arg_type) {}
-
- FMT_CONSTEXPR specs_checker(const specs_checker& other)
- : Handler(other), checker_(error_handler(), other.arg_type_) {}
-
- FMT_CONSTEXPR void on_align(align_t align) {
- if (align == align::numeric) checker_.require_numeric_argument();
- Handler::on_align(align);
- }
-
- FMT_CONSTEXPR void on_plus() {
- checker_.check_sign();
- Handler::on_plus();
- }
-
- FMT_CONSTEXPR void on_minus() {
- checker_.check_sign();
- Handler::on_minus();
- }
-
- FMT_CONSTEXPR void on_space() {
- checker_.check_sign();
- Handler::on_space();
- }
-
- FMT_CONSTEXPR void on_hash() {
- checker_.require_numeric_argument();
- Handler::on_hash();
- }
-
- FMT_CONSTEXPR void on_zero() {
- checker_.require_numeric_argument();
- Handler::on_zero();
- }
-
- FMT_CONSTEXPR void end_precision() { checker_.check_precision(); }
-};
-
template <template <typename> class Handler, typename FormatArg,
typename ErrorHandler>
-FMT_CONSTEXPR int get_dynamic_spec(FormatArg arg, ErrorHandler eh) {
+FMT_CONSTEXPR auto get_dynamic_spec(FormatArg arg, ErrorHandler eh) -> int {
unsigned long long value = visit_format_arg(Handler<ErrorHandler>(eh), arg);
if (value > to_unsigned(max_value<int>())) eh.on_error("number is too big");
return static_cast<int>(value);
}
-struct auto_id {};
-
template <typename Context, typename ID>
-FMT_CONSTEXPR typename Context::format_arg get_arg(Context& ctx, ID id) {
+FMT_CONSTEXPR auto get_arg(Context& ctx, ID id) ->
+ typename Context::format_arg {
auto arg = ctx.arg(id);
if (!arg) ctx.on_error("argument not found");
return arg;
}
// The standard format specifier handler with checking.
-template <typename ParseContext, typename Context>
-class specs_handler : public specs_setter<typename Context::char_type> {
- public:
- using char_type = typename Context::char_type;
-
- FMT_CONSTEXPR specs_handler(basic_format_specs<char_type>& specs,
- ParseContext& parse_ctx, Context& ctx)
- : specs_setter<char_type>(specs),
- parse_context_(parse_ctx),
- context_(ctx) {}
-
- template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) {
- this->specs_.width = get_dynamic_spec<width_checker>(
- get_arg(arg_id), context_.error_handler());
- }
-
- template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) {
- this->specs_.precision = get_dynamic_spec<precision_checker>(
- get_arg(arg_id), context_.error_handler());
- }
-
- void on_error(const char* message) { context_.on_error(message); }
-
+template <typename Char> class specs_handler : public specs_setter<Char> {
private:
+ basic_format_parse_context<Char>& parse_context_;
+ buffer_context<Char>& context_;
+
// This is only needed for compatibility with gcc 4.4.
- using format_arg = typename Context::format_arg;
+ using format_arg = basic_format_arg<buffer_context<Char>>;
- FMT_CONSTEXPR format_arg get_arg(auto_id) {
+ FMT_CONSTEXPR auto get_arg(auto_id) -> format_arg {
return detail::get_arg(context_, parse_context_.next_arg_id());
}
- FMT_CONSTEXPR format_arg get_arg(int arg_id) {
+ FMT_CONSTEXPR auto get_arg(int arg_id) -> format_arg {
parse_context_.check_arg_id(arg_id);
return detail::get_arg(context_, arg_id);
}
- FMT_CONSTEXPR format_arg get_arg(basic_string_view<char_type> arg_id) {
+ FMT_CONSTEXPR auto get_arg(basic_string_view<Char> arg_id) -> format_arg {
parse_context_.check_arg_id(arg_id);
return detail::get_arg(context_, arg_id);
}
- ParseContext& parse_context_;
- Context& context_;
-};
-
-enum class arg_id_kind { none, index, name };
-
-// An argument reference.
-template <typename Char> 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<Char> name)
- : kind(arg_id_kind::name), val(name) {}
-
- FMT_CONSTEXPR arg_ref& operator=(int idx) {
- kind = arg_id_kind::index;
- val.index = idx;
- return *this;
- }
-
- arg_id_kind kind;
- union value {
- FMT_CONSTEXPR value(int id = 0) : index{id} {}
- FMT_CONSTEXPR value(basic_string_view<Char> n) : name(n) {}
-
- int index;
- basic_string_view<Char> name;
- } val;
-};
-
-// Format specifiers with width and precision resolved at formatting rather
-// than parsing time to allow re-using the same parsed specifiers with
-// different sets of arguments (precompilation of format strings).
-template <typename Char>
-struct dynamic_format_specs : basic_format_specs<Char> {
- arg_ref<Char> width_ref;
- arg_ref<Char> precision_ref;
-};
-
-// Format spec handler that saves references to arguments representing dynamic
-// width and precision to be resolved at formatting time.
-template <typename ParseContext>
-class dynamic_specs_handler
- : public specs_setter<typename ParseContext::char_type> {
public:
- using char_type = typename ParseContext::char_type;
-
- FMT_CONSTEXPR dynamic_specs_handler(dynamic_format_specs<char_type>& specs,
- ParseContext& ctx)
- : specs_setter<char_type>(specs), specs_(specs), context_(ctx) {}
-
- FMT_CONSTEXPR dynamic_specs_handler(const dynamic_specs_handler& other)
- : specs_setter<char_type>(other),
- specs_(other.specs_),
- context_(other.context_) {}
+ FMT_CONSTEXPR specs_handler(basic_format_specs<Char>& specs,
+ basic_format_parse_context<Char>& parse_ctx,
+ buffer_context<Char>& ctx)
+ : specs_setter<Char>(specs), parse_context_(parse_ctx), context_(ctx) {}
template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) {
- specs_.width_ref = make_arg_ref(arg_id);
+ this->specs_.width = get_dynamic_spec<width_checker>(
+ get_arg(arg_id), context_.error_handler());
}
template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) {
- specs_.precision_ref = make_arg_ref(arg_id);
- }
-
- FMT_CONSTEXPR void on_error(const char* message) {
- context_.on_error(message);
- }
-
- private:
- using arg_ref_type = arg_ref<char_type>;
-
- FMT_CONSTEXPR arg_ref_type make_arg_ref(int arg_id) {
- context_.check_arg_id(arg_id);
- return arg_ref_type(arg_id);
- }
-
- FMT_CONSTEXPR arg_ref_type make_arg_ref(auto_id) {
- return arg_ref_type(context_.next_arg_id());
- }
-
- FMT_CONSTEXPR arg_ref_type make_arg_ref(basic_string_view<char_type> arg_id) {
- context_.check_arg_id(arg_id);
- basic_string_view<char_type> format_str(
- context_.begin(), to_unsigned(context_.end() - context_.begin()));
- return arg_ref_type(arg_id);
- }
-
- dynamic_format_specs<char_type>& specs_;
- ParseContext& context_;
-};
-
-template <typename Char, typename IDHandler>
-FMT_CONSTEXPR const Char* parse_arg_id(const Char* begin, const Char* end,
- IDHandler&& handler) {
- FMT_ASSERT(begin != end, "");
- Char c = *begin;
- if (c == '}' || c == ':') {
- handler();
- return begin;
- }
- if (c >= '0' && c <= '9') {
- int index = 0;
- if (c != '0')
- index = parse_nonnegative_int(begin, end, handler);
- else
- ++begin;
- if (begin == end || (*begin != '}' && *begin != ':'))
- handler.on_error("invalid format string");
- else
- handler(index);
- return begin;
- }
- if (!is_name_start(c)) {
- handler.on_error("invalid format string");
- return begin;
- }
- auto it = begin;
- do {
- ++it;
- } while (it != end && (is_name_start(c = *it) || ('0' <= c && c <= '9')));
- handler(basic_string_view<Char>(begin, to_unsigned(it - begin)));
- return it;
-}
-
-// Adapts SpecHandler to IDHandler API for dynamic width.
-template <typename SpecHandler, typename Char> struct width_adapter {
- explicit FMT_CONSTEXPR width_adapter(SpecHandler& h) : handler(h) {}
-
- FMT_CONSTEXPR void operator()() { handler.on_dynamic_width(auto_id()); }
- FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_width(id); }
- FMT_CONSTEXPR void operator()(basic_string_view<Char> id) {
- handler.on_dynamic_width(id);
- }
-
- FMT_CONSTEXPR void on_error(const char* message) {
- handler.on_error(message);
- }
-
- SpecHandler& handler;
-};
-
-// Adapts SpecHandler to IDHandler API for dynamic precision.
-template <typename SpecHandler, typename Char> struct precision_adapter {
- explicit FMT_CONSTEXPR precision_adapter(SpecHandler& h) : handler(h) {}
-
- FMT_CONSTEXPR void operator()() { handler.on_dynamic_precision(auto_id()); }
- FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_precision(id); }
- FMT_CONSTEXPR void operator()(basic_string_view<Char> id) {
- handler.on_dynamic_precision(id);
- }
-
- FMT_CONSTEXPR void on_error(const char* message) {
- handler.on_error(message);
+ this->specs_.precision = get_dynamic_spec<precision_checker>(
+ get_arg(arg_id), context_.error_handler());
}
- SpecHandler& handler;
+ void on_error(const char* message) { context_.on_error(message); }
};
-template <typename Char>
-FMT_CONSTEXPR int code_point_length(const Char* begin) {
- if (const_check(sizeof(Char) != 1)) return 1;
- constexpr char lengths[] = {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, 0};
- int len = lengths[static_cast<unsigned char>(*begin) >> 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.
- return len + !len;
-}
-
-template <typename Char> constexpr bool is_ascii_letter(Char c) {
- return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
-}
-
-// Converts a character to ASCII. Returns a number > 127 on conversion failure.
-template <typename Char, FMT_ENABLE_IF(std::is_integral<Char>::value)>
-constexpr Char to_ascii(Char value) {
- return value;
-}
-template <typename Char, FMT_ENABLE_IF(std::is_enum<Char>::value)>
-constexpr typename std::underlying_type<Char>::type to_ascii(Char value) {
- return value;
-}
-
-// Parses fill and alignment.
-template <typename Char, typename Handler>
-FMT_CONSTEXPR const Char* parse_align(const Char* begin, const Char* end,
- Handler&& handler) {
- FMT_ASSERT(begin != end, "");
- auto align = align::none;
- auto p = begin + code_point_length(begin);
- if (p >= end) p = begin;
- for (;;) {
- switch (to_ascii(*p)) {
- case '<':
- align = align::left;
- break;
- case '>':
- align = align::right;
- break;
-#if FMT_DEPRECATED_NUMERIC_ALIGN
- case '=':
- align = align::numeric;
- break;
-#endif
- case '^':
- align = align::center;
- break;
- }
- if (align != align::none) {
- if (p != begin) {
- auto c = *begin;
- if (c == '{')
- return handler.on_error("invalid fill character '{'"), begin;
- handler.on_fill(basic_string_view<Char>(begin, to_unsigned(p - begin)));
- begin = p + 1;
- } else
- ++begin;
- handler.on_align(align);
- break;
- } else if (p == begin) {
- break;
- }
- p = begin;
- }
- return begin;
-}
-
-template <typename Char, typename Handler>
-FMT_CONSTEXPR const Char* parse_width(const Char* begin, const Char* end,
- Handler&& handler) {
- FMT_ASSERT(begin != end, "");
- if ('0' <= *begin && *begin <= '9') {
- handler.on_width(parse_nonnegative_int(begin, end, handler));
- } else if (*begin == '{') {
- ++begin;
- if (begin != end)
- begin = parse_arg_id(begin, end, width_adapter<Handler, Char>(handler));
- if (begin == end || *begin != '}')
- return handler.on_error("invalid format string"), begin;
- ++begin;
- }
- return begin;
-}
-
-template <typename Char, typename Handler>
-FMT_CONSTEXPR const Char* parse_precision(const Char* begin, const Char* end,
- Handler&& handler) {
- ++begin;
- auto c = begin != end ? *begin : Char();
- if ('0' <= c && c <= '9') {
- handler.on_precision(parse_nonnegative_int(begin, end, handler));
- } else if (c == '{') {
- ++begin;
- if (begin != end) {
- begin =
- parse_arg_id(begin, end, precision_adapter<Handler, Char>(handler));
- }
- if (begin == end || *begin++ != '}')
- return handler.on_error("invalid format string"), begin;
- } else {
- return handler.on_error("missing precision specifier"), begin;
- }
- handler.end_precision();
- return begin;
-}
-
-// Parses standard format specifiers and sends notifications about parsed
-// components to handler.
-template <typename Char, typename SpecHandler>
-FMT_CONSTEXPR const Char* parse_format_specs(const Char* begin, const Char* end,
- SpecHandler&& handler) {
- if (begin == end) return begin;
-
- begin = parse_align(begin, end, handler);
- if (begin == end) return begin;
-
- // Parse sign.
- switch (to_ascii(*begin)) {
- case '+':
- handler.on_plus();
- ++begin;
+template <template <typename> class Handler, typename Context>
+FMT_CONSTEXPR void handle_dynamic_spec(int& value,
+ arg_ref<typename Context::char_type> ref,
+ Context& ctx) {
+ switch (ref.kind) {
+ case arg_id_kind::none:
break;
- case '-':
- handler.on_minus();
- ++begin;
+ case arg_id_kind::index:
+ value = detail::get_dynamic_spec<Handler>(ctx.arg(ref.val.index),
+ ctx.error_handler());
break;
- case ' ':
- handler.on_space();
- ++begin;
+ case arg_id_kind::name:
+ value = detail::get_dynamic_spec<Handler>(ctx.arg(ref.val.name),
+ ctx.error_handler());
break;
}
- if (begin == end) return begin;
-
- if (*begin == '#') {
- handler.on_hash();
- if (++begin == end) return begin;
- }
-
- // Parse zero flag.
- if (*begin == '0') {
- handler.on_zero();
- if (++begin == end) return begin;
- }
-
- begin = parse_width(begin, end, handler);
- if (begin == end) return begin;
-
- // Parse precision.
- if (*begin == '.') {
- begin = parse_precision(begin, end, handler);
- }
-
- // Parse type.
- if (begin != end && *begin != '}') handler.on_type(*begin++);
- return begin;
-}
-
-// Return the result via the out param to workaround gcc bug 77539.
-template <bool IS_CONSTEXPR, typename T, typename Ptr = const T*>
-FMT_CONSTEXPR bool find(Ptr first, Ptr last, T value, Ptr& out) {
- for (out = first; out != last; ++out) {
- if (*out == value) return true;
- }
- return false;
-}
-
-template <>
-inline bool find<false, char>(const char* first, const char* last, char value,
- const char*& out) {
- out = static_cast<const char*>(
- std::memchr(first, value, detail::to_unsigned(last - first)));
- return out != nullptr;
}
-template <typename Handler, typename Char> struct id_adapter {
- Handler& handler;
- int arg_id;
+#if FMT_USE_USER_DEFINED_LITERALS
+template <typename Char> struct udl_formatter {
+ basic_string_view<Char> str;
- FMT_CONSTEXPR void operator()() { arg_id = handler.on_arg_id(); }
- FMT_CONSTEXPR void operator()(int id) { arg_id = handler.on_arg_id(id); }
- FMT_CONSTEXPR void operator()(basic_string_view<Char> id) {
- arg_id = handler.on_arg_id(id);
- }
- FMT_CONSTEXPR void on_error(const char* message) {
- handler.on_error(message);
+ template <typename... T>
+ auto operator()(T&&... args) const -> std::basic_string<Char> {
+ return vformat(str, fmt::make_format_args<buffer_context<Char>>(args...));
}
};
-template <typename Char, typename Handler>
-FMT_CONSTEXPR const Char* parse_replacement_field(const Char* begin,
- const Char* end,
- Handler&& handler) {
- ++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, Char>{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 <bool IS_CONSTEXPR, typename Char, typename Handler>
-FMT_CONSTEXPR_DECL FMT_INLINE void parse_format_string(
- basic_string_view<Char> 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* pbegin, const Char* pend) {
- if (pbegin == pend) return;
- for (;;) {
- const Char* p = nullptr;
- if (!find<IS_CONSTEXPR>(pbegin, pend, '}', p))
- return handler_.on_text(pbegin, pend);
- ++p;
- if (p == pend || *p != '}')
- return handler_.on_error("unmatched '}' in format string");
- handler_.on_text(pbegin, p);
- pbegin = 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<IS_CONSTEXPR>(begin + 1, end, '{', p))
- return write(begin, end);
- write(begin, p);
- begin = parse_replacement_field(p, end, handler);
- }
-}
-
-template <typename T, typename ParseContext>
-FMT_CONSTEXPR const typename ParseContext::char_type* parse_format_specs(
- ParseContext& ctx) {
- using char_type = typename ParseContext::char_type;
- using context = buffer_context<char_type>;
- using mapped_type =
- conditional_t<detail::mapped_type_constant<T, context>::value !=
- type::custom_type,
- decltype(arg_mapper<context>().map(std::declval<T>())), T>;
- auto f = conditional_t<has_formatter<mapped_type, context>::value,
- formatter<mapped_type, char_type>,
- detail::fallback_formatter<T, char_type>>();
- return f.parse(ctx);
-}
-
-template <typename OutputIt, typename Char, typename Context>
-struct format_handler : detail::error_handler {
- basic_format_parse_context<Char> parse_context;
- Context context;
-
- format_handler(OutputIt out, basic_string_view<Char> str,
- basic_format_args<Context> format_args, detail::locale_ref loc)
- : parse_context(str), context(out, format_args, loc) {}
-
- void on_text(const Char* begin, const Char* end) {
- auto size = to_unsigned(end - begin);
- auto out = context.out();
- auto&& it = reserve(out, size);
- it = std::copy_n(begin, size, it);
- context.advance_to(out);
- }
-
- int on_arg_id() { return parse_context.next_arg_id(); }
- int on_arg_id(int id) { return parse_context.check_arg_id(id), id; }
- int on_arg_id(basic_string_view<Char> id) {
- int arg_id = context.arg_id(id);
- if (arg_id < 0) on_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<OutputIt, Char>{context.out(), context.args(),
- context.locale()},
- arg));
- }
-
- const Char* on_format_specs(int id, const Char* begin, const Char* end) {
- auto arg = get_arg(context, id);
- if (arg.type() == type::custom_type) {
- advance_to(parse_context, begin);
- visit_format_arg(custom_formatter<Context>(parse_context, context), arg);
- return parse_context.begin();
- }
- auto specs = basic_format_specs<Char>();
- if (begin + 1 < end && begin[1] == '}' && is_ascii_letter(*begin)) {
- specs.type = static_cast<char>(*begin++);
- } else {
- using parse_context_t = basic_format_parse_context<Char>;
- specs_checker<specs_handler<parse_context_t, Context>> handler(
- specs_handler<parse_context_t, Context>(specs, parse_context,
- context),
- arg.type());
- begin = parse_format_specs(begin, end, handler);
- if (begin == end || *begin != '}')
- on_error("missing '}' in format string");
- }
- context.advance_to(visit_format_arg(
- arg_formatter<OutputIt, Char>(context, &parse_context, &specs), arg));
- return begin;
- }
-};
-
-// A parse context with extra argument id checks. It is only used at compile
-// time because adding checks at runtime would introduce substantial overhead
-// and would be redundant since argument ids are checked when arguments are
-// retrieved anyway.
-template <typename Char, typename ErrorHandler = error_handler>
-class compile_parse_context
- : public basic_format_parse_context<Char, ErrorHandler> {
- private:
- int num_args_;
- using base = basic_format_parse_context<Char, ErrorHandler>;
-
- public:
- explicit FMT_CONSTEXPR compile_parse_context(
- basic_string_view<Char> format_str, int num_args = max_value<int>(),
- ErrorHandler eh = {})
- : base(format_str, eh), num_args_(num_args) {}
+# if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <typename T, typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct statically_named_arg : view {
+ static constexpr auto name = Str.data;
- FMT_CONSTEXPR int next_arg_id() {
- int id = base::next_arg_id();
- if (id >= num_args_) this->on_error("argument not found");
- return id;
- }
-
- FMT_CONSTEXPR void check_arg_id(int id) {
- base::check_arg_id(id);
- if (id >= num_args_) this->on_error("argument not found");
- }
- using base::check_arg_id;
+ const T& value;
+ statically_named_arg(const T& v) : value(v) {}
};
-template <typename Char, typename ErrorHandler, typename... Args>
-class format_string_checker {
- public:
- explicit FMT_CONSTEXPR format_string_checker(
- basic_string_view<Char> format_str, ErrorHandler eh)
- : context_(format_str, num_args, eh),
- parse_funcs_{&parse_format_specs<Args, parse_context_type>...} {}
+template <typename T, typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct is_named_arg<statically_named_arg<T, Char, N, Str>> : std::true_type {};
- FMT_CONSTEXPR void on_text(const Char*, const Char*) {}
+template <typename T, typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct is_statically_named_arg<statically_named_arg<T, Char, N, Str>>
+ : std::true_type {};
- FMT_CONSTEXPR int on_arg_id() { return context_.next_arg_id(); }
- FMT_CONSTEXPR int on_arg_id(int id) { return context_.check_arg_id(id), id; }
- FMT_CONSTEXPR int on_arg_id(basic_string_view<Char>) {
- on_error("compile-time checks don't support named arguments");
- return 0;
- }
-
- FMT_CONSTEXPR void on_replacement_field(int, const Char*) {}
-
- FMT_CONSTEXPR const Char* on_format_specs(int id, const Char* begin,
- const Char*) {
- advance_to(context_, begin);
- return id < num_args ? parse_funcs_[id](context_) : begin;
+template <typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct udl_arg {
+ template <typename T> auto operator=(T&& value) const {
+ return statically_named_arg<T, Char, N, Str>(std::forward<T>(value));
}
+};
+# else
+template <typename Char> struct udl_arg {
+ const Char* str;
- FMT_CONSTEXPR void on_error(const char* message) {
- context_.on_error(message);
+ template <typename T> auto operator=(T&& value) const -> named_arg<Char, T> {
+ return {str, std::forward<T>(value)};
}
-
- private:
- using parse_context_type = compile_parse_context<Char, ErrorHandler>;
- enum { num_args = sizeof...(Args) };
-
- // Format specifier parsing function.
- using parse_func = const Char* (*)(parse_context_type&);
-
- parse_context_type context_;
- parse_func parse_funcs_[num_args > 0 ? num_args : 1];
};
+# endif
+#endif // FMT_USE_USER_DEFINED_LITERALS
-// Converts string literals to basic_string_view.
-template <typename Char, size_t N>
-FMT_CONSTEXPR basic_string_view<Char> compile_string_to_view(
- const Char (&s)[N]) {
- // Remove trailing null character if needed. Won't be present if this is used
- // with raw character array (i.e. not defined as a string).
- return {s,
- N - ((std::char_traits<Char>::to_int_type(s[N - 1]) == 0) ? 1 : 0)};
-}
-
-// Converts string_view to basic_string_view.
-template <typename Char>
-FMT_CONSTEXPR basic_string_view<Char> compile_string_to_view(
- const std_string_view<Char>& s) {
- return {s.data(), s.size()};
-}
-
-#define FMT_STRING_IMPL(s, base) \
- [] { \
- /* Use a macro-like name to avoid shadowing warnings. */ \
- struct FMT_COMPILE_STRING : base { \
- using char_type = fmt::remove_cvref_t<decltype(s[0])>; \
- FMT_MAYBE_UNUSED FMT_CONSTEXPR \
- operator fmt::basic_string_view<char_type>() const { \
- return fmt::detail::compile_string_to_view<char_type>(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::compile_string)
-
-template <typename... Args, typename S,
- enable_if_t<(is_compile_string<S>::value), int>>
-void check_format_string(S format_str) {
- FMT_CONSTEXPR_DECL auto s = to_string_view(format_str);
- using checker = format_string_checker<typename S::char_type, error_handler,
- remove_cvref_t<Args>...>;
- FMT_CONSTEXPR_DECL bool invalid_format =
- (parse_format_string<true>(s, checker(s, {})), true);
- (void)invalid_format;
-}
-
-template <template <typename> class Handler, typename Context>
-void handle_dynamic_spec(int& value, arg_ref<typename Context::char_type> ref,
- Context& ctx) {
- switch (ref.kind) {
- case arg_id_kind::none:
- break;
- case arg_id_kind::index:
- value = detail::get_dynamic_spec<Handler>(ctx.arg(ref.val.index),
- ctx.error_handler());
- break;
- case arg_id_kind::name:
- value = detail::get_dynamic_spec<Handler>(ctx.arg(ref.val.name),
- ctx.error_handler());
- break;
- }
+template <typename Locale, typename Char>
+auto vformat(const Locale& loc, basic_string_view<Char> format_str,
+ basic_format_args<buffer_context<type_identity_t<Char>>> args)
+ -> std::basic_string<Char> {
+ basic_memory_buffer<Char> buffer;
+ detail::vformat_to(buffer, format_str, args, detail::locale_ref(loc));
+ return {buffer.data(), buffer.size()};
}
-using format_func = void (*)(detail::buffer<char>&, int, string_view);
+using format_func = void (*)(detail::buffer<char>&, int, const char*);
FMT_API void format_error_code(buffer<char>& out, int error_code,
- string_view message) FMT_NOEXCEPT;
+ string_view message) noexcept;
FMT_API void report_error(format_func func, int error_code,
- string_view message) FMT_NOEXCEPT;
-} // namespace detail
+ const char* message) noexcept;
+FMT_END_DETAIL_NAMESPACE
-template <typename OutputIt, typename Char>
-using arg_formatter FMT_DEPRECATED_ALIAS =
- detail::arg_formatter<OutputIt, Char>;
+FMT_API auto vsystem_error(int error_code, string_view format_str,
+ format_args args) -> std::system_error;
/**
- An error returned by an operating system or a language runtime,
- for example a file opening error.
-*/
-FMT_CLASS_API
-class FMT_API system_error : public std::runtime_error {
- private:
- void init(int err_code, string_view format_str, format_args args);
-
- protected:
- int error_code_;
+ \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``.
- system_error() : std::runtime_error(""), error_code_(0) {}
+ **Example**::
- public:
- /**
- \rst
- Constructs a :class:`fmt::system_error` object with a description
- formatted with `fmt::format_system_error`. *message* and additional
- arguments passed into the constructor are formatted similarly to
- `fmt::format`.
-
- **Example**::
-
- // This throws a 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 <typename... Args>
- system_error(int error_code, string_view message, const Args&... args)
- : std::runtime_error("") {
- init(error_code, message, make_format_args(args...));
- }
- system_error(const system_error&) = default;
- system_error& operator=(const system_error&) = default;
- system_error(system_error&&) = default;
- system_error& operator=(system_error&&) = default;
- ~system_error() FMT_NOEXCEPT FMT_OVERRIDE;
-
- int error_code() const { return error_code_; }
-};
+ // 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 <typename... T>
+auto system_error(int error_code, format_string<T...> fmt, T&&... args)
+ -> std::system_error {
+ return vsystem_error(error_code, fmt, fmt::make_format_args(args...));
+}
/**
\rst
- Formats an error returned by an operating system or a language runtime,
- for example a file opening error, and writes it to *out* in the following
- form:
+ 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::
*<message>*: *<system-message>*
- where *<message>* is the passed message and *<system-message>* is
- the system message corresponding to the error code.
+ where *<message>* is the passed message and *<system-message>* is the system
+ message corresponding to the error code.
*error_code* is a system error code as given by ``errno``.
- If *error_code* is not a valid error code such as -1, the system message
- may look like "Unknown error -1" and is platform-dependent.
\endrst
*/
FMT_API void format_system_error(detail::buffer<char>& out, int error_code,
- string_view message) FMT_NOEXCEPT;
+ 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,
- string_view message) FMT_NOEXCEPT;
+FMT_API void report_system_error(int error_code, const char* message) noexcept;
/** Fast integer formatter. */
class format_int {
@@ -3339,12 +3631,12 @@ class format_int {
mutable char buffer_[buffer_size];
char* str_;
- template <typename UInt> char* format_unsigned(UInt value) {
+ template <typename UInt> auto format_unsigned(UInt value) -> char* {
auto n = static_cast<detail::uint32_or_64_or_128_t<UInt>>(value);
return detail::format_decimal(buffer_, n, buffer_size - 1).begin;
}
- template <typename Int> char* format_signed(Int value) {
+ template <typename Int> auto format_signed(Int value) -> char* {
auto abs_value = static_cast<detail::uint32_or_64_or_128_t<Int>>(value);
bool negative = value < 0;
if (negative) abs_value = 0 - abs_value;
@@ -3363,7 +3655,7 @@ class format_int {
: str_(format_unsigned(value)) {}
/** Returns the number of characters written to the output buffer. */
- size_t size() const {
+ auto size() const -> size_t {
return detail::to_unsigned(buffer_ - str_ + buffer_size - 1);
}
@@ -3371,13 +3663,13 @@ class format_int {
Returns a pointer to the output buffer content. No terminating null
character is appended.
*/
- const char* data() const { return str_; }
+ auto data() const -> const char* { return str_; }
/**
Returns a pointer to the output buffer content with terminating null
character appended.
*/
- const char* c_str() const {
+ auto c_str() const -> const char* {
buffer_[buffer_size - 1] = '\0';
return str_;
}
@@ -3387,121 +3679,33 @@ class format_int {
Returns the content of the output buffer as an ``std::string``.
\endrst
*/
- std::string str() const { return std::string(str_, size()); }
+ auto str() const -> std::string { return std::string(str_, size()); }
};
-// A formatter specialization for the core types corresponding to detail::type
-// constants.
template <typename T, typename Char>
-struct formatter<T, Char,
- enable_if_t<detail::type_constant<T, Char>::value !=
- detail::type::custom_type>> {
- FMT_CONSTEXPR formatter() = default;
-
- // Parses format specifiers stopping either at the end of the range or at the
- // terminating '}'.
- template <typename ParseContext>
- FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
- using handler_type = detail::dynamic_specs_handler<ParseContext>;
- auto type = detail::type_constant<T, Char>::value;
- detail::specs_checker<handler_type> handler(handler_type(specs_, ctx),
- type);
- auto it = parse_format_specs(ctx.begin(), ctx.end(), handler);
- auto eh = ctx.error_handler();
- switch (type) {
- case detail::type::none_type:
- FMT_ASSERT(false, "invalid argument type");
- break;
- case detail::type::int_type:
- case detail::type::uint_type:
- case detail::type::long_long_type:
- case detail::type::ulong_long_type:
- case detail::type::int128_type:
- case detail::type::uint128_type:
- case detail::type::bool_type:
- handle_int_type_spec(specs_.type,
- detail::int_type_checker<decltype(eh)>(eh));
- break;
- case detail::type::char_type:
- handle_char_specs(
- &specs_, detail::char_specs_checker<decltype(eh)>(specs_.type, eh));
- break;
- case detail::type::float_type:
- if (detail::const_check(FMT_USE_FLOAT))
- detail::parse_float_type_spec(specs_, eh);
- else
- FMT_ASSERT(false, "float support disabled");
- break;
- case detail::type::double_type:
- if (detail::const_check(FMT_USE_DOUBLE))
- detail::parse_float_type_spec(specs_, eh);
- else
- FMT_ASSERT(false, "double support disabled");
- break;
- case detail::type::long_double_type:
- if (detail::const_check(FMT_USE_LONG_DOUBLE))
- detail::parse_float_type_spec(specs_, eh);
- else
- FMT_ASSERT(false, "long double support disabled");
- break;
- case detail::type::cstring_type:
- detail::handle_cstring_type_spec(
- specs_.type, detail::cstring_type_checker<decltype(eh)>(eh));
- break;
- case detail::type::string_type:
- detail::check_string_type_spec(specs_.type, eh);
- break;
- case detail::type::pointer_type:
- detail::check_pointer_type_spec(specs_.type, eh);
- break;
- case detail::type::custom_type:
- // Custom format specifiers should be checked in parse functions of
- // formatter specializations.
- break;
- }
- return it;
- }
-
- template <typename FormatContext>
- auto format(const T& val, FormatContext& ctx) -> decltype(ctx.out()) {
- detail::handle_dynamic_spec<detail::width_checker>(specs_.width,
- specs_.width_ref, ctx);
+template <typename FormatContext>
+FMT_CONSTEXPR FMT_INLINE auto
+formatter<T, Char,
+ enable_if_t<detail::type_constant<T, Char>::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) {
+ auto specs = specs_;
+ detail::handle_dynamic_spec<detail::width_checker>(specs.width,
+ specs.width_ref, ctx);
detail::handle_dynamic_spec<detail::precision_checker>(
- specs_.precision, specs_.precision_ref, ctx);
- using af = detail::arg_formatter<typename FormatContext::iterator,
- typename FormatContext::char_type>;
- return visit_format_arg(af(ctx, nullptr, &specs_),
- detail::make_arg<FormatContext>(val));
+ specs.precision, specs.precision_ref, ctx);
+ return detail::write<Char>(ctx.out(), val, specs, ctx.locale());
}
-
- private:
- detail::dynamic_format_specs<Char> specs_;
-};
-
-#define FMT_FORMAT_AS(Type, Base) \
- template <typename Char> \
- struct formatter<Type, Char> : formatter<Base, Char> { \
- template <typename FormatContext> \
- auto format(Type const& val, FormatContext& ctx) -> decltype(ctx.out()) { \
- return formatter<Base, Char>::format(val, ctx); \
- } \
- }
-
-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, long long);
-FMT_FORMAT_AS(unsigned long, unsigned long long);
-FMT_FORMAT_AS(Char*, const Char*);
-FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>);
-FMT_FORMAT_AS(std::nullptr_t, const void*);
-FMT_FORMAT_AS(detail::std_string_view<Char>, basic_string_view<Char>);
+ return detail::write<Char>(ctx.out(), val, specs_, ctx.locale());
+}
template <typename Char>
struct formatter<void*, Char> : formatter<const void*, Char> {
template <typename FormatContext>
- auto format(void* val, FormatContext& ctx) -> decltype(ctx.out()) {
+ auto format(void* val, FormatContext& ctx) const -> decltype(ctx.out()) {
return formatter<const void*, Char>::format(val, ctx);
}
};
@@ -3509,7 +3713,8 @@ struct formatter<void*, Char> : formatter<const void*, Char> {
template <typename Char, size_t N>
struct formatter<Char[N], Char> : formatter<basic_string_view<Char>, Char> {
template <typename FormatContext>
- auto format(const Char* val, FormatContext& ctx) -> decltype(ctx.out()) {
+ FMT_CONSTEXPR auto format(const Char* val, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
return formatter<basic_string_view<Char>, Char>::format(val, ctx);
}
};
@@ -3528,21 +3733,29 @@ struct formatter<Char[N], Char> : formatter<basic_string_view<Char>, Char> {
// };
template <typename Char = char> class dynamic_formatter {
private:
+ detail::dynamic_format_specs<Char> specs_;
+ const Char* format_str_;
+
struct null_handler : detail::error_handler {
void on_align(align_t) {}
- void on_plus() {}
- void on_minus() {}
- void on_space() {}
+ void on_sign(sign_t) {}
void on_hash() {}
};
+ template <typename Context> void handle_specs(Context& ctx) {
+ detail::handle_dynamic_spec<detail::width_checker>(specs_.width,
+ specs_.width_ref, ctx);
+ detail::handle_dynamic_spec<detail::precision_checker>(
+ specs_.precision, specs_.precision_ref, ctx);
+ }
+
public:
template <typename ParseContext>
- auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
format_str_ = ctx.begin();
// Checks are deferred to formatting time when the argument type is known.
detail::dynamic_specs_handler<ParseContext> handler(specs_, ctx);
- return parse_format_specs(ctx.begin(), ctx.end(), handler);
+ return detail::parse_format_specs(ctx.begin(), ctx.end(), handler);
}
template <typename T, typename FormatContext>
@@ -3551,46 +3764,13 @@ template <typename Char = char> class dynamic_formatter {
detail::specs_checker<null_handler> checker(
null_handler(), detail::mapped_type_constant<T, FormatContext>::value);
checker.on_align(specs_.align);
- switch (specs_.sign) {
- case sign::none:
- break;
- case sign::plus:
- checker.on_plus();
- break;
- case sign::minus:
- checker.on_minus();
- break;
- case sign::space:
- checker.on_space();
- break;
- }
+ if (specs_.sign != sign::none) checker.on_sign(specs_.sign);
if (specs_.alt) checker.on_hash();
if (specs_.precision >= 0) checker.end_precision();
- using af = detail::arg_formatter<typename FormatContext::iterator,
- typename FormatContext::char_type>;
- visit_format_arg(af(ctx, nullptr, &specs_),
- detail::make_arg<FormatContext>(val));
- return ctx.out();
+ return detail::write<Char>(ctx.out(), val, specs_, ctx.locale());
}
-
- private:
- template <typename Context> void handle_specs(Context& ctx) {
- detail::handle_dynamic_spec<detail::width_checker>(specs_.width,
- specs_.width_ref, ctx);
- detail::handle_dynamic_spec<detail::precision_checker>(
- specs_.precision, specs_.precision_ref, ctx);
- }
-
- detail::dynamic_format_specs<Char> specs_;
- const Char* format_str_;
};
-template <typename Char, typename ErrorHandler>
-FMT_CONSTEXPR void advance_to(
- basic_format_parse_context<Char, ErrorHandler>& ctx, const Char* p) {
- ctx.advance_to(ctx.begin() + (p - &*ctx.begin()));
-}
-
/**
\rst
Converts ``p`` to ``const void*`` for pointer formatting.
@@ -3600,14 +3780,39 @@ FMT_CONSTEXPR void advance_to(
auto s = fmt::format("{}", fmt::ptr(p));
\endrst
*/
-template <typename T> inline const void* ptr(const T* p) { return p; }
-template <typename T> inline const void* ptr(const std::unique_ptr<T>& p) {
+template <typename T> auto ptr(T p) -> const void* {
+ static_assert(std::is_pointer<T>::value, "");
+ return detail::bit_cast<const void*>(p);
+}
+template <typename T> auto ptr(const std::unique_ptr<T>& p) -> const void* {
return p.get();
}
-template <typename T> inline const void* ptr(const std::shared_ptr<T>& p) {
+template <typename T> auto ptr(const std::shared_ptr<T>& 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 <typename Enum>
+constexpr auto underlying(Enum e) noexcept -> underlying_t<Enum> {
+ return static_cast<underlying_t<Enum>>(e);
+}
+
+namespace enums {
+template <typename Enum, FMT_ENABLE_IF(std::is_enum<Enum>::value)>
+constexpr auto format_as(Enum e) noexcept -> underlying_t<Enum> {
+ return static_cast<underlying_t<Enum>>(e);
+}
+} // namespace enums
+
class bytes {
private:
string_view data_;
@@ -3642,31 +3847,111 @@ template <> struct formatter<bytes> {
}
};
-template <typename It, typename Sentinel, typename Char>
-struct arg_join : detail::view {
+// group_digits_view is not derived from view because it copies the argument.
+template <typename T> 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 <typename T> auto group_digits(T value) -> group_digits_view<T> {
+ return {value};
+}
+
+template <typename T> struct formatter<group_digits_view<T>> : formatter<T> {
+ private:
+ detail::dynamic_format_specs<char> specs_;
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ using handler_type = detail::dynamic_specs_handler<ParseContext>;
+ detail::specs_checker<handler_type> handler(handler_type(specs_, ctx),
+ detail::type::int_type);
+ auto it = parse_format_specs(ctx.begin(), ctx.end(), handler);
+ detail::check_string_type_spec(specs_.type, ctx.error_handler());
+ return it;
+ }
+
+ template <typename FormatContext>
+ auto format(group_digits_view<T> t, FormatContext& ctx)
+ -> decltype(ctx.out()) {
+ detail::handle_dynamic_spec<detail::width_checker>(specs_.width,
+ specs_.width_ref, ctx);
+ detail::handle_dynamic_spec<detail::precision_checker>(
+ specs_.precision, specs_.precision_ref, ctx);
+ return detail::write_int_localized(
+ ctx.out(), static_cast<detail::uint64_or_128_t<T>>(t.value), 0, specs_,
+ detail::digit_grouping<char>({"\3", ','}));
+ }
+};
+
+template <typename It, typename Sentinel, typename Char = char>
+struct join_view : detail::view {
It begin;
Sentinel end;
basic_string_view<Char> sep;
- arg_join(It b, Sentinel e, basic_string_view<Char> s)
+ join_view(It b, Sentinel e, basic_string_view<Char> s)
: begin(b), end(e), sep(s) {}
};
template <typename It, typename Sentinel, typename Char>
-struct formatter<arg_join<It, Sentinel, Char>, Char>
- : formatter<typename std::iterator_traits<It>::value_type, Char> {
+struct formatter<join_view<It, Sentinel, Char>, Char> {
+ private:
+ using value_type =
+#ifdef __cpp_lib_ranges
+ std::iter_value_t<It>;
+#else
+ typename std::iterator_traits<It>::value_type;
+#endif
+ using context = buffer_context<Char>;
+ using mapper = detail::arg_mapper<context>;
+
+ template <typename T, FMT_ENABLE_IF(has_formatter<T, context>::value)>
+ static auto map(const T& value) -> const T& {
+ return value;
+ }
+ template <typename T, FMT_ENABLE_IF(!has_formatter<T, context>::value)>
+ static auto map(const T& value) -> decltype(mapper().map(value)) {
+ return mapper().map(value);
+ }
+
+ using formatter_type =
+ conditional_t<is_formattable<value_type, Char>::value,
+ formatter<remove_cvref_t<decltype(map(
+ std::declval<const value_type&>()))>,
+ Char>,
+ detail::fallback_formatter<value_type, Char>>;
+
+ formatter_type value_formatter_;
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return value_formatter_.parse(ctx);
+ }
+
template <typename FormatContext>
- auto format(const arg_join<It, Sentinel, Char>& value, FormatContext& ctx)
- -> decltype(ctx.out()) {
- using base = formatter<typename std::iterator_traits<It>::value_type, Char>;
+ auto format(const join_view<It, Sentinel, Char>& value,
+ FormatContext& ctx) const -> decltype(ctx.out()) {
auto it = value.begin;
auto out = ctx.out();
if (it != value.end) {
- out = base::format(*it++, ctx);
+ out = value_formatter_.format(map(*it), ctx);
+ ++it;
while (it != value.end) {
- out = std::copy(value.sep.begin(), value.sep.end(), out);
+ out = detail::copy_str<Char>(value.sep.begin(), value.sep.end(), out);
ctx.advance_to(out);
- out = base::format(*it++, ctx);
+ out = value_formatter_.format(map(*it), ctx);
+ ++it;
}
}
return out;
@@ -3674,22 +3959,17 @@ struct formatter<arg_join<It, Sentinel, Char>, Char>
};
/**
- Returns an object that formats the iterator range `[begin, end)` with elements
+ Returns a view that formats the iterator range `[begin, end)` with elements
separated by `sep`.
*/
template <typename It, typename Sentinel>
-arg_join<It, Sentinel, char> join(It begin, Sentinel end, string_view sep) {
- return {begin, end, sep};
-}
-
-template <typename It, typename Sentinel>
-arg_join<It, Sentinel, wchar_t> join(It begin, Sentinel end, wstring_view sep) {
+auto join(It begin, Sentinel end, string_view sep) -> join_view<It, Sentinel> {
return {begin, end, sep};
}
/**
\rst
- Returns an object that formats `range` with elements separated by `sep`.
+ Returns a view that formats `range` with elements separated by `sep`.
**Example**::
@@ -3704,14 +3984,8 @@ arg_join<It, Sentinel, wchar_t> join(It begin, Sentinel end, wstring_view sep) {
\endrst
*/
template <typename Range>
-arg_join<detail::iterator_t<Range>, detail::sentinel_t<Range>, char> join(
- Range&& range, string_view sep) {
- return join(std::begin(range), std::end(range), sep);
-}
-
-template <typename Range>
-arg_join<detail::iterator_t<Range>, detail::sentinel_t<Range>, wchar_t> join(
- Range&& range, wstring_view sep) {
+auto join(Range&& range, string_view sep)
+ -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>> {
return join(std::begin(range), std::end(range), sep);
}
@@ -3727,209 +4001,129 @@ arg_join<detail::iterator_t<Range>, detail::sentinel_t<Range>, wchar_t> join(
\endrst
*/
template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
-inline std::string to_string(const T& value) {
- std::string result;
+inline auto to_string(const T& value) -> std::string {
+ auto result = std::string();
detail::write<char>(std::back_inserter(result), value);
return result;
}
template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
-inline std::string to_string(T value) {
- // The buffer should be large enough to store the number including the sign or
- // "false" for bool.
+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<T>() + 2;
char buffer[max_size > 5 ? static_cast<unsigned>(max_size) : 5];
char* begin = buffer;
return std::string(begin, detail::write<char>(begin, value));
}
-/**
- Converts *value* to ``std::wstring`` using the default format for type *T*.
- */
-template <typename T> inline std::wstring to_wstring(const T& value) {
- return format(L"{}", value);
-}
-
template <typename Char, size_t SIZE>
-std::basic_string<Char> to_string(const basic_memory_buffer<Char, SIZE>& buf) {
+FMT_NODISCARD auto to_string(const basic_memory_buffer<Char, SIZE>& buf)
+ -> std::basic_string<Char> {
auto size = buf.size();
detail::assume(size < std::basic_string<Char>().max_size());
return std::basic_string<Char>(buf.data(), size);
}
+FMT_BEGIN_DETAIL_NAMESPACE
+
template <typename Char>
-void detail::vformat_to(
- detail::buffer<Char>& buf, basic_string_view<Char> format_str,
- basic_format_args<buffer_context<type_identity_t<Char>>> args,
- detail::locale_ref loc) {
- using iterator = typename buffer_context<Char>::iterator;
+void vformat_to(
+ buffer<Char>& buf, basic_string_view<Char> fmt,
+ basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args,
+ locale_ref loc) {
+ // workaround for msvc bug regarding name-lookup in module
+ // link names into function scope
+ using detail::arg_formatter;
+ using detail::buffer_appender;
+ using detail::custom_formatter;
+ using detail::default_arg_formatter;
+ using detail::get_arg;
+ using detail::locale_ref;
+ using detail::parse_format_specs;
+ using detail::specs_checker;
+ using detail::specs_handler;
+ using detail::to_unsigned;
+ using detail::type;
+ using detail::write;
auto out = buffer_appender<Char>(buf);
- if (format_str.size() == 2 && equal2(format_str.data(), "{}")) {
+ if (fmt.size() == 2 && equal2(fmt.data(), "{}")) {
auto arg = args.get(0);
if (!arg) error_handler().on_error("argument not found");
- visit_format_arg(default_arg_formatter<iterator, Char>{out, args, loc},
- arg);
+ visit_format_arg(default_arg_formatter<Char>{out, args, loc}, arg);
return;
}
- format_handler<iterator, Char, buffer_context<Char>> h(out, format_str, args,
- loc);
- parse_format_string<false>(format_str, h);
-}
-#ifndef FMT_HEADER_ONLY
-extern template void detail::vformat_to(detail::buffer<char>&, string_view,
- basic_format_args<format_context>,
- detail::locale_ref);
-namespace detail {
+ struct format_handler : error_handler {
+ basic_format_parse_context<Char> parse_context;
+ buffer_context<Char> context;
-extern template FMT_API std::string grouping_impl<char>(locale_ref loc);
-extern template FMT_API std::string grouping_impl<wchar_t>(locale_ref loc);
-extern template FMT_API char thousands_sep_impl<char>(locale_ref loc);
-extern template FMT_API wchar_t thousands_sep_impl<wchar_t>(locale_ref loc);
-extern template FMT_API char decimal_point_impl(locale_ref loc);
-extern template FMT_API wchar_t decimal_point_impl(locale_ref loc);
-extern template int format_float<double>(double value, int precision,
- float_specs specs, buffer<char>& buf);
-extern template int format_float<long double>(long double value, int precision,
- float_specs specs,
- buffer<char>& buf);
-int snprintf_float(float value, int precision, float_specs specs,
- buffer<char>& buf) = delete;
-extern template int snprintf_float<double>(double value, int precision,
- float_specs specs,
- buffer<char>& buf);
-extern template int snprintf_float<long double>(long double value,
- int precision,
- float_specs specs,
- buffer<char>& buf);
-} // namespace detail
-#endif
-
-template <typename S, typename Char = char_t<S>,
- FMT_ENABLE_IF(detail::is_string<S>::value)>
-inline void vformat_to(
- detail::buffer<Char>& buf, const S& format_str,
- basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args) {
- return detail::vformat_to(buf, to_string_view(format_str), args);
-}
-
-template <typename S, typename... Args, size_t SIZE = inline_buffer_size,
- typename Char = enable_if_t<detail::is_string<S>::value, char_t<S>>>
-inline typename buffer_context<Char>::iterator format_to(
- basic_memory_buffer<Char, SIZE>& buf, const S& format_str, Args&&... args) {
- const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
- detail::vformat_to(buf, to_string_view(format_str), vargs);
- return detail::buffer_appender<Char>(buf);
-}
+ format_handler(buffer_appender<Char> p_out, basic_string_view<Char> str,
+ basic_format_args<buffer_context<Char>> p_args,
+ locale_ref p_loc)
+ : parse_context(str), context(p_out, p_args, p_loc) {}
-template <typename OutputIt, typename Char = char>
-using format_context_t = basic_format_context<OutputIt, Char>;
-
-template <typename OutputIt, typename Char = char>
-using format_args_t = basic_format_args<format_context_t<OutputIt, Char>>;
-
-template <typename OutputIt, typename Char = typename OutputIt::value_type>
-using format_to_n_context FMT_DEPRECATED_ALIAS = buffer_context<Char>;
+ void on_text(const Char* begin, const Char* end) {
+ auto text = basic_string_view<Char>(begin, to_unsigned(end - begin));
+ context.advance_to(write<Char>(context.out(), text));
+ }
-template <typename OutputIt, typename Char = typename OutputIt::value_type>
-using format_to_n_args FMT_DEPRECATED_ALIAS =
- basic_format_args<buffer_context<Char>>;
+ 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<Char> id) -> int {
+ int arg_id = context.arg_id(id);
+ if (arg_id < 0) on_error("argument not found");
+ return arg_id;
+ }
-template <typename OutputIt, typename Char, typename... Args>
-FMT_DEPRECATED format_arg_store<buffer_context<Char>, Args...>
-make_format_to_n_args(const Args&... args) {
- return format_arg_store<buffer_context<Char>, Args...>(args...);
-}
+ 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<Char>{context.out(), context.args(),
+ context.locale()},
+ arg));
+ }
-template <typename Char, enable_if_t<(!std::is_same<Char, char>::value), int>>
-std::basic_string<Char> detail::vformat(
- basic_string_view<Char> format_str,
- basic_format_args<buffer_context<type_identity_t<Char>>> args) {
- basic_memory_buffer<Char> buffer;
- detail::vformat_to(buffer, format_str, args);
- return to_string(buffer);
+ auto on_format_specs(int id, const Char* begin, const Char* end)
+ -> const Char* {
+ auto arg = get_arg(context, id);
+ if (arg.type() == type::custom_type) {
+ parse_context.advance_to(parse_context.begin() +
+ (begin - &*parse_context.begin()));
+ visit_format_arg(custom_formatter<Char>{parse_context, context}, arg);
+ return parse_context.begin();
+ }
+ auto specs = basic_format_specs<Char>();
+ specs_checker<specs_handler<Char>> handler(
+ specs_handler<Char>(specs, parse_context, context), arg.type());
+ begin = parse_format_specs(begin, end, handler);
+ if (begin == end || *begin != '}')
+ on_error("missing '}' in format string");
+ auto f = arg_formatter<Char>{context.out(), specs, context.locale()};
+ context.advance_to(visit_format_arg(f, arg));
+ return begin;
+ }
+ };
+ detail::parse_format_string<false>(fmt, format_handler(out, fmt, args, loc));
}
-template <typename Char, FMT_ENABLE_IF(std::is_same<Char, wchar_t>::value)>
-void vprint(std::FILE* f, basic_string_view<Char> format_str,
- wformat_args args) {
- wmemory_buffer buffer;
- detail::vformat_to(buffer, format_str, args);
- buffer.push_back(L'\0');
- if (std::fputws(buffer.data(), f) == -1)
- FMT_THROW(system_error(errno, "cannot write to file"));
-}
+#ifndef FMT_HEADER_ONLY
+extern template FMT_API auto thousands_sep_impl<char>(locale_ref)
+ -> thousands_sep_result<char>;
+extern template FMT_API auto thousands_sep_impl<wchar_t>(locale_ref)
+ -> thousands_sep_result<wchar_t>;
+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
-template <typename Char, FMT_ENABLE_IF(std::is_same<Char, wchar_t>::value)>
-void vprint(basic_string_view<Char> format_str, wformat_args args) {
- vprint(stdout, format_str, args);
-}
+FMT_END_DETAIL_NAMESPACE
#if FMT_USE_USER_DEFINED_LITERALS
-namespace detail {
-
-# if FMT_USE_UDL_TEMPLATE
-template <typename Char, Char... CHARS> class udl_formatter {
- public:
- template <typename... Args>
- std::basic_string<Char> operator()(Args&&... args) const {
- static FMT_CONSTEXPR_DECL Char s[] = {CHARS..., '\0'};
- return format(FMT_STRING(s), std::forward<Args>(args)...);
- }
-};
-# else
-template <typename Char> struct udl_formatter {
- basic_string_view<Char> str;
-
- template <typename... Args>
- std::basic_string<Char> operator()(Args&&... args) const {
- return format(str, std::forward<Args>(args)...);
- }
-};
-# endif // FMT_USE_UDL_TEMPLATE
-
-template <typename Char> struct udl_arg {
- const Char* str;
-
- template <typename T> named_arg<Char, T> operator=(T&& value) const {
- return {str, std::forward<T>(value)};
- }
-};
-} // namespace detail
-
inline namespace literals {
-# if FMT_USE_UDL_TEMPLATE
-# pragma GCC diagnostic push
-# pragma GCC diagnostic ignored "-Wpedantic"
-# if FMT_CLANG_VERSION
-# pragma GCC diagnostic ignored "-Wgnu-string-literal-operator-template"
-# endif
-template <typename Char, Char... CHARS>
-FMT_CONSTEXPR detail::udl_formatter<Char, CHARS...> operator""_format() {
- return {};
-}
-# pragma GCC diagnostic pop
-# else
-/**
- \rst
- User-defined literal equivalent of :func:`fmt::format`.
-
- **Example**::
-
- using namespace fmt::literals;
- std::string message = "The answer is {}"_format(42);
- \endrst
- */
-FMT_CONSTEXPR detail::udl_formatter<char> operator"" _format(const char* s,
- size_t n) {
- return {{s, n}};
-}
-FMT_CONSTEXPR detail::udl_formatter<wchar_t> operator"" _format(
- const wchar_t* s, size_t n) {
- return {{s, n}};
-}
-# endif // FMT_USE_UDL_TEMPLATE
-
/**
\rst
User-defined literal equivalent of :func:`fmt::arg`.
@@ -3940,14 +4134,52 @@ FMT_CONSTEXPR detail::udl_formatter<wchar_t> operator"" _format(
fmt::print("Elapsed time: {s:.2f} seconds", "s"_a=1.23);
\endrst
*/
-FMT_CONSTEXPR detail::udl_arg<char> operator"" _a(const char* s, size_t) {
- return {s};
+# if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <detail_exported::fixed_string Str> constexpr auto operator""_a() {
+ using char_t = remove_cvref_t<decltype(Str.data[0])>;
+ return detail::udl_arg<char_t, sizeof(Str.data) / sizeof(char_t), Str>();
}
-FMT_CONSTEXPR detail::udl_arg<wchar_t> operator"" _a(const wchar_t* s, size_t) {
+# else
+constexpr auto operator"" _a(const char* s, size_t) -> detail::udl_arg<char> {
return {s};
}
+# endif
} // namespace literals
#endif // FMT_USE_USER_DEFINED_LITERALS
+
+template <typename Locale, FMT_ENABLE_IF(detail::is_locale<Locale>::value)>
+inline auto vformat(const Locale& loc, string_view fmt, format_args args)
+ -> std::string {
+ return detail::vformat(loc, fmt, args);
+}
+
+template <typename Locale, typename... T,
+ FMT_ENABLE_IF(detail::is_locale<Locale>::value)>
+inline auto format(const Locale& loc, format_string<T...> fmt, T&&... args)
+ -> std::string {
+ return vformat(loc, string_view(fmt), fmt::make_format_args(args...));
+}
+
+template <typename OutputIt, typename Locale,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&&
+ detail::is_locale<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<char>(out);
+ detail::vformat_to(buf, fmt, args, detail::locale_ref(loc));
+ return detail::get_iterator(buf);
+}
+
+template <typename OutputIt, typename Locale, typename... T,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&&
+ detail::is_locale<Locale>::value)>
+FMT_INLINE auto format_to(OutputIt out, const Locale& loc,
+ format_string<T...> fmt, T&&... args) -> OutputIt {
+ return vformat_to(out, loc, fmt, fmt::make_format_args(args...));
+}
+
+FMT_MODULE_EXPORT_END
FMT_END_NAMESPACE
#ifdef FMT_HEADER_ONLY