| /* |
| Formatting library for C++ |
| |
| Copyright (c) 2012 - present, Victor Zverovich |
| |
| SPDX-License-Identifier: MIT |
| |
| 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 "core.h" |
| |
| #ifdef __INTEL_COMPILER |
| # define FMT_ICC_VERSION __INTEL_COMPILER |
| #elif defined(__ICL) |
| # define FMT_ICC_VERSION __ICL |
| #else |
| # define FMT_ICC_VERSION 0 |
| #endif |
| |
| #ifdef __NVCC__ |
| # define FMT_CUDA_VERSION (__CUDACC_VER_MAJOR__ * 100 + __CUDACC_VER_MINOR__) |
| #else |
| # define FMT_CUDA_VERSION 0 |
| #endif |
| |
| #ifdef __has_builtin |
| # define FMT_HAS_BUILTIN(x) __has_builtin(x) |
| #else |
| # define FMT_HAS_BUILTIN(x) 0 |
| #endif |
| |
| #if FMT_GCC_VERSION || FMT_CLANG_VERSION |
| # define FMT_NOINLINE __attribute__((noinline)) |
| #else |
| # define FMT_NOINLINE |
| #endif |
| |
| #if __cplusplus == 201103L || __cplusplus == 201402L |
| # if defined(__clang__) |
| # define FMT_FALLTHROUGH [[clang::fallthrough]] |
| # elif FMT_GCC_VERSION >= 700 && !defined(__PGI) && \ |
| (!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]] |
| #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 |
| #endif |
| |
| #ifndef FMT_THROW |
| # if FMT_EXCEPTIONS |
| # if FMT_MSC_VER || FMT_NVCC |
| FMT_BEGIN_NAMESPACE |
| namespace detail { |
| template <typename Exception> inline void do_throw(const Exception& x) { |
| // Silence unreachable code warnings in MSVC and NVCC because these |
| // are nearly impossible to fix in a generic code. |
| volatile bool b = true; |
| if (b) throw x; |
| } |
| } // namespace detail |
| FMT_END_NAMESPACE |
| # define FMT_THROW(x) detail::do_throw(x) |
| # else |
| # define FMT_THROW(x) throw x |
| # endif |
| # else |
| # define FMT_THROW(x) \ |
| do { \ |
| static_cast<void>(sizeof(x)); \ |
| FMT_ASSERT(false, ""); \ |
| } while (false) |
| # endif |
| #endif |
| |
| #if FMT_EXCEPTIONS |
| # define FMT_TRY try |
| # define FMT_CATCH(x) catch (x) |
| #else |
| # define FMT_TRY if (true) |
| # define FMT_CATCH(x) if (false) |
| #endif |
| |
| #ifndef FMT_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) && \ |
| (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= /* UDL feature */ 480) |
| # define FMT_USE_USER_DEFINED_LITERALS 1 |
| # else |
| # define FMT_USE_USER_DEFINED_LITERALS 0 |
| # endif |
| #endif |
| |
| #ifndef FMT_USE_UDL_TEMPLATE |
| // EDG frontend based compilers (icc, nvcc, 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) |
| # 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. |
| #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 |
| |
| // 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(_MANAGED) |
| # include <intrin.h> // _BitScanReverse, _BitScanReverse64 |
| |
| FMT_BEGIN_NAMESPACE |
| namespace detail { |
| // Avoid Clang with Microsoft CodeGen's -Wunknown-pragmas warning. |
| # ifndef __clang__ |
| # pragma intrinsic(_BitScanReverse) |
| # endif |
| inline uint32_t clz(uint32_t x) { |
| 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) |
| return 31 - r; |
| } |
| # define FMT_BUILTIN_CLZ(n) detail::clz(n) |
| |
| # if defined(_WIN64) && !defined(__clang__) |
| # pragma intrinsic(_BitScanReverse64) |
| # endif |
| |
| inline uint32_t clzll(uint64_t x) { |
| unsigned long r = 0; |
| # ifdef _WIN64 |
| _BitScanReverse64(&r, x); |
| # else |
| // Scan the high 32 bits. |
| if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32))) return 63 - (r + 32); |
| |
| // Scan the low 32 bits. |
| _BitScanReverse(&r, static_cast<uint32_t>(x)); |
| # endif |
| |
| 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) |
| return 63 - r; |
| } |
| # define FMT_BUILTIN_CLZLL(n) detail::clzll(n) |
| } // namespace detail |
| 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; |
| } |
| |
| inline bool is_big_endian() { |
| const auto u = 1u; |
| struct bytes { |
| char data[sizeof(u)]; |
| }; |
| return bit_cast<bytes>(u).data[0] == 0; |
| } |
| |
| // A fallback implementation of uintptr_t for systems that lack it. |
| struct fallback_uintptr { |
| unsigned char value[sizeof(void*)]; |
| |
| 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]); |
| } |
| } |
| }; |
| #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); |
| } |
| #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() { |
| return (std::numeric_limits<T>::max)(); |
| } |
| template <typename T> constexpr int num_bits() { |
| 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); |
| } |
| |
| FMT_INLINE void assume(bool condition) { |
| (void)condition; |
| #if FMT_HAS_BUILTIN(__builtin_assume) |
| __builtin_assume(condition); |
| #endif |
| } |
| |
| // An approximation of iterator_t for pre-C++20 systems. |
| template <typename T> |
| 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) { |
| return &s[0]; |
| } |
| template <typename Container> |
| inline typename Container::value_type* get_data(Container& c) { |
| 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) { |
| return {p, size}; |
| } |
| #else |
| template <typename T> using checked_ptr = T*; |
| template <typename T> inline T* make_checked(T* p, size_t) { return p; } |
| #endif |
| |
| template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)> |
| #if FMT_CLANG_VERSION |
| __attribute__((no_sanitize("undefined"))) |
| #endif |
| inline checked_ptr<typename Container::value_type> |
| reserve(std::back_insert_iterator<Container> it, size_t n) { |
| Container& c = get_container(it); |
| size_t size = c.size(); |
| c.resize(size + n); |
| return make_checked(get_data(c) + size, n); |
| } |
| |
| template <typename T> |
| inline buffer_appender<T> reserve(buffer_appender<T> it, size_t n) { |
| buffer<T>& buf = get_container(it); |
| buf.try_reserve(buf.size() + n); |
| return it; |
| } |
| |
| template <typename Iterator> inline Iterator& reserve(Iterator& it, size_t) { |
| return it; |
| } |
| |
| template <typename T, typename OutputIt> |
| constexpr T* to_pointer(OutputIt, size_t) { |
| return nullptr; |
| } |
| template <typename T> T* to_pointer(buffer_appender<T> it, size_t n) { |
| buffer<T>& buf = get_container(it); |
| auto size = buf.size(); |
| if (buf.capacity() < size + n) return nullptr; |
| buf.try_resize(size + n); |
| return buf.data() + size; |
| } |
| |
| template <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>) { |
| return it; |
| } |
| |
| template <typename Iterator> |
| inline Iterator base_iterator(Iterator, Iterator it) { |
| 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; |
| } |
| |
| 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; |
| } |
| |
| truncating_iterator operator++(int) { |
| auto it = *this; |
| ++*this; |
| return it; |
| } |
| |
| value_type& operator*() const { |
| return this->count_ < this->limit_ ? *this->out_ : blackhole_; |
| } |
| }; |
| |
| 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; |
| } |
| |
| 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) { |
| 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(); |
| 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; |
| } |
| 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())); |
| } |
| |
| template <typename Char> |
| inline size_t code_point_index(basic_string_view<Char> s, size_t n) { |
| 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(); |
| 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; |
| } |
| } |
| 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); |
| } |
| |
| 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_GRISU |
| # define FMT_USE_GRISU 1 |
| #endif |
| |
| template <typename T> constexpr bool use_grisu() { |
| return FMT_USE_GRISU && std::numeric_limits<double>::is_iec559 && |
| sizeof(T) <= sizeof(double); |
| } |
| |
| template <typename T> |
| template <typename U> |
| void buffer<T>::append(const U* begin, const U* end) { |
| do { |
| auto count = to_unsigned(end - begin); |
| try_reserve(size_ + count); |
| auto free_cap = capacity_ - size_; |
| if (free_cap < count) count = free_cap; |
| std::uninitialized_copy_n(begin, count, make_checked(ptr_ + size_, count)); |
| size_ += count; |
| begin += count; |
| } while (begin != end); |
| } |
| |
| template <typename OutputIt, typename T> |
| void iterator_buffer<OutputIt, T>::flush() { |
| out_ = std::copy(data_, data_ + this->size(), out_); |
| this->clear(); |
| } |
| } // namespace detail |
| |
| // The number of characters to store in the basic_memory_buffer object itself |
| // to avoid dynamic memory allocation. |
| enum { inline_buffer_size = 500 }; |
| |
| /** |
| \rst |
| A dynamically growing memory buffer for trivially copyable/constructible types |
| with the first ``SIZE`` elements stored in the object itself. |
| |
| You can use 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> | |
| +----------------+------------------------------+ |
| |
| **Example**:: |
| |
| fmt::memory_buffer out; |
| format_to(out, "The answer is {}.", 42); |
| |
| This will append the following output to the ``out`` object: |
| |
| .. code-block:: none |
| |
| The answer is 42. |
| |
| The output can be converted to an ``std::string`` with ``to_string(out)``. |
| \endrst |
| */ |
| template <typename T, size_t SIZE = inline_buffer_size, |
| typename Allocator = std::allocator<T>> |
| class basic_memory_buffer : public detail::buffer<T> { |
| private: |
| T store_[SIZE]; |
| |
| // Don't inherit from Allocator avoid generating type_info for it. |
| Allocator alloc_; |
| |
| // Deallocate memory allocated by the buffer. |
| void deallocate() { |
| T* data = this->data(); |
| if (data != store_) alloc_.deallocate(data, this->capacity()); |
| } |
| |
| protected: |
| void grow(size_t size) final; |
| |
| public: |
| using value_type = T; |
| using const_reference = const T&; |
| |
| explicit basic_memory_buffer(const Allocator& alloc = Allocator()) |
| : alloc_(alloc) { |
| this->set(store_, SIZE); |
| } |
| ~basic_memory_buffer() { deallocate(); } |
| |
| private: |
| // Move data from other to this buffer. |
| 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)); |
| } else { |
| this->set(data, capacity); |
| // Set pointer to the inline array so that delete is not called |
| // when deallocating. |
| other.set(other.store_, 0); |
| } |
| this->resize(size); |
| } |
| |
| public: |
| /** |
| \rst |
| Constructs a :class:`fmt::basic_memory_buffer` object moving the content |
| of the other object to it. |
| \endrst |
| */ |
| basic_memory_buffer(basic_memory_buffer&& other) FMT_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 { |
| FMT_ASSERT(this != &other, ""); |
| deallocate(); |
| move(other); |
| return *this; |
| } |
| |
| // Returns a copy of the allocator associated with this buffer. |
| Allocator get_allocator() const { 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); } |
| |
| /** Increases the buffer capacity to *new_capacity*. */ |
| void reserve(size_t new_capacity) { this->try_reserve(new_capacity); } |
| }; |
| |
| 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 |
| size_t old_capacity = this->capacity(); |
| size_t new_capacity = old_capacity + old_capacity / 2; |
| if (size > new_capacity) new_capacity = size; |
| T* old_data = this->data(); |
| T* new_data = |
| std::allocator_traits<Allocator>::allocate(alloc_, new_capacity); |
| // The following code doesn't throw, so the raw pointer above doesn't leak. |
| std::uninitialized_copy(old_data, old_data + this->size(), |
| detail::make_checked(new_data, new_capacity)); |
| this->set(new_data, new_capacity); |
| // deallocate must not throw according to the standard, but even if it does, |
| // the buffer already uses the new storage and will deallocate it in |
| // destructor. |
| if (old_data != store_) alloc_.deallocate(old_data, old_capacity); |
| } |
| |
| 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 { |
| }; |
| |
| /** A formatting error such as invalid format string. */ |
| FMT_CLASS_API |
| class FMT_API format_error : public std::runtime_error { |
| public: |
| explicit format_error(const char* message) : std::runtime_error(message) {} |
| explicit format_error(const std::string& message) |
| : std::runtime_error(message) {} |
| format_error(const format_error&) = default; |
| format_error& operator=(const format_error&) = default; |
| format_error(format_error&&) = default; |
| format_error& operator=(format_error&&) = default; |
| ~format_error() FMT_NOEXCEPT FMT_OVERRIDE; |
| }; |
| |
| namespace detail { |
| |
| // Returns true if value is negative, false otherwise. |
| // Same as `value < 0` but doesn't produce warnings if T is an unsigned type. |
| template <typename T, FMT_ENABLE_IF(std::numeric_limits<T>::is_signed)> |
| FMT_CONSTEXPR bool is_negative(T value) { |
| return value < 0; |
| } |
| template <typename T, FMT_ENABLE_IF(!std::numeric_limits<T>::is_signed)> |
| FMT_CONSTEXPR bool is_negative(T) { |
| 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); |
| } |
| |
| #if FMT_REDUCE_INT_INSTANTIATIONS |
| // Pick the largest integer container to represent all values of T. |
| template <typename T> |
| using uint32_or_64_or_128_t = |
| conditional_t<sizeof(uint128_t) < sizeof(uint64_t), uint64_t, uint128_t>; |
| #else |
| // Smallest of uint32_t, uint64_t, uint128_t that is large enough to |
| // represent all values of T. |
| template <typename T> |
| using uint32_or_64_or_128_t = conditional_t< |
| num_bits<T>() <= 32, uint32_t, |
| conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>>; |
| #endif |
| |
| // 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[]; |
| static const uint64_t zero_or_powers_of_10_64[]; |
| static const uint64_t pow10_significands[]; |
| static const int16_t pow10_exponents[]; |
| // 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]; |
| }; |
| |
| #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) { |
| // Based on http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10 |
| // and the benchmark https://github.com/localvoid/cxx-benchmark-count-digits. |
| int t = (64 - FMT_BUILTIN_CLZLL(n | 1)) * 1233 >> 12; |
| return t - (n < data::zero_or_powers_of_10_64[t]) + 1; |
| } |
| #else |
| // Fallback version of count_digits used when __builtin_clz is not available. |
| inline int count_digits(uint64_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; |
| } |
| } |
| #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; |
| } |
| } |
| #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; |
| } |
| |
| template <> int count_digits<4>(detail::fallback_uintptr n); |
| |
| #if FMT_GCC_VERSION || FMT_CLANG_VERSION |
| # define FMT_ALWAYS_INLINE inline __attribute__((always_inline)) |
| #else |
| # define FMT_ALWAYS_INLINE |
| #endif |
| |
| #ifdef FMT_BUILTIN_CLZ |
| // Optional version of count_digits for better performance on 32-bit platforms. |
| inline int count_digits(uint32_t n) { |
| int t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12; |
| return t - (n < data::zero_or_powers_of_10_32[t]) + 1; |
| } |
| #endif |
| |
| template <typename Int> constexpr int digits10() FMT_NOEXCEPT { |
| return std::numeric_limits<Int>::digits10; |
| } |
| 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 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 <> inline wchar_t thousands_sep(locale_ref loc) { |
| 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) { |
| return Char(decimal_point_impl<char>(loc)); |
| } |
| template <> inline wchar_t decimal_point(locale_ref loc) { |
| 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]; |
| } |
| inline bool equal2(const char* lhs, const char* rhs) { |
| return memcmp(lhs, rhs, 2) == 0; |
| } |
| |
| // Copies two characters from src to dst. |
| template <typename Char> void copy2(Char* dst, const char* src) { |
| *dst++ = static_cast<Char>(*src++); |
| *dst = static_cast<Char>(*src); |
| } |
| inline void copy2(char* dst, const char* src) { memcpy(dst, src, 2); } |
| |
| template <typename Iterator> struct format_decimal_result { |
| Iterator begin; |
| Iterator end; |
| }; |
| |
| // Formats a decimal unsigned integer value writing into out pointing to a |
| // buffer of specified size. The caller must ensure that the buffer is large |
| // enough. |
| template <typename Char, typename UInt> |
| inline format_decimal_result<Char*> format_decimal(Char* out, UInt value, |
| int size) { |
| FMT_ASSERT(size >= count_digits(value), "invalid digit count"); |
| out += size; |
| Char* end = out; |
| while (value >= 100) { |
| // Integer division is slow so do it for a group of two digits instead |
| // of for every digit. The idea comes from the talk by Alexandrescu |
| // "Three Optimization Tips for C++". See speed-test for a comparison. |
| out -= 2; |
| copy2(out, data::digits[value % 100]); |
| value /= 100; |
| } |
| if (value < 10) { |
| *--out = static_cast<Char>('0' + value); |
| return {out, end}; |
| } |
| out -= 2; |
| copy2(out, data::digits[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 num_digits) { |
| // Buffer should be large enough to hold all digits (<= digits10 + 1). |
| enum { max_size = digits10<UInt>() + 1 }; |
| Char buffer[2 * max_size]; |
| auto end = format_decimal(buffer, value, num_digits).end; |
| return {out, detail::copy_str<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) { |
| buffer += num_digits; |
| Char* end = buffer; |
| do { |
| const char* digits = upper ? "0123456789ABCDEF" : data::hex_digits; |
| unsigned digit = (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) { |
| // 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); |
| } |
| |
| // A converter from UTF-8 to UTF-16. |
| class utf8_to_utf16 { |
| private: |
| wmemory_buffer 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]; |
| unsigned char size_; |
| |
| 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]; |
| } |
| |
| static FMT_CONSTEXPR fill_t<Char> make() { |
| auto fill = fill_t<Char>(); |
| fill[0] = Char(' '); |
| fill.size_ = 1; |
| return fill; |
| } |
| }; |
| } // 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), |
| fill(detail::fill_t<Char>::make()) {} |
| }; |
| |
| using format_specs = basic_format_specs<char>; |
| |
| namespace detail { |
| |
| // A floating-point presentation format. |
| enum class float_format : unsigned char { |
| general, // General: exponent notation or fixed point based on magnitude. |
| exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3. |
| fixed, // Fixed point with the default precision of 6, e.g. 0.0012. |
| hex |
| }; |
| |
| struct float_specs { |
| int precision; |
| float_format format : 8; |
| sign_t sign : 8; |
| bool upper : 1; |
| bool locale : 1; |
| bool binary32 : 1; |
| bool use_grisu : 1; |
| bool showpoint : 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) { |
| FMT_ASSERT(-10000 < exp && exp < 10000, "exponent out of range"); |
| if (exp < 0) { |
| *it++ = static_cast<Char>('-'); |
| exp = -exp; |
| } else { |
| *it++ = static_cast<Char>('+'); |
| } |
| if (exp >= 100) { |
| const char* top = data::digits[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]; |
| *it++ = static_cast<Char>(d[0]); |
| *it++ = static_cast<Char>(d[1]); |
| return it; |
| } |
| |
| template <typename Char> class float_writer { |
| private: |
| // The number is given as v = digits_ * pow(10, exp_). |
| const char* digits_; |
| int num_digits_; |
| int exp_; |
| size_t size_; |
| float_specs specs_; |
| Char decimal_point_; |
| |
| template <typename It> It prettify(It it) const { |
| // pow(10, full_exp - 1) <= v <= pow(10, full_exp). |
| int full_exp = num_digits_ + exp_; |
| if (specs_.format == float_format::exp) { |
| // Insert a decimal point after the first digit and add an exponent. |
| *it++ = static_cast<Char>(*digits_); |
| int num_zeros = specs_.precision - num_digits_; |
| if (num_digits_ > 1 || specs_.showpoint) *it++ = decimal_point_; |
| it = copy_str<Char>(digits_ + 1, digits_ + num_digits_, it); |
| if (num_zeros > 0 && specs_.showpoint) |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| *it++ = static_cast<Char>(specs_.upper ? 'E' : 'e'); |
| return write_exponent<Char>(full_exp - 1, it); |
| } |
| if (num_digits_ <= full_exp) { |
| // 1234e7 -> 12340000000[.0+] |
| it = copy_str<Char>(digits_, digits_ + num_digits_, it); |
| it = std::fill_n(it, full_exp - num_digits_, static_cast<Char>('0')); |
| if (specs_.showpoint || specs_.precision < 0) { |
| *it++ = decimal_point_; |
| int num_zeros = specs_.precision - full_exp; |
| if (num_zeros <= 0) { |
| if (specs_.format != float_format::fixed) |
| *it++ = static_cast<Char>('0'); |
| return it; |
| } |
| #ifdef FMT_FUZZ |
| if (num_zeros > 5000) |
| throw std::runtime_error("fuzz mode - avoiding excessive cpu use"); |
| #endif |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| } |
| } else if (full_exp > 0) { |
| // 1234e-2 -> 12.34[0+] |
| it = copy_str<Char>(digits_, digits_ + full_exp, it); |
| if (!specs_.showpoint) { |
| // Remove trailing zeros. |
| int num_digits = num_digits_; |
| while (num_digits > full_exp && digits_[num_digits - 1] == '0') |
| --num_digits; |
| if (num_digits != full_exp) *it++ = decimal_point_; |
| return copy_str<Char>(digits_ + full_exp, digits_ + num_digits, it); |
| } |
| *it++ = decimal_point_; |
| it = copy_str<Char>(digits_ + full_exp, digits_ + num_digits_, it); |
| if (specs_.precision > num_digits_) { |
| // Add trailing zeros. |
| int num_zeros = specs_.precision - num_digits_; |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| } |
| } else { |
| // 1234e-6 -> 0.001234 |
| *it++ = static_cast<Char>('0'); |
| int num_zeros = -full_exp; |
| int num_digits = num_digits_; |
| if (num_digits == 0 && specs_.precision >= 0 && |
| specs_.precision < num_zeros) { |
| num_zeros = specs_.precision; |
| } |
| // Remove trailing zeros. |
| if (!specs_.showpoint) |
| while (num_digits > 0 && digits_[num_digits - 1] == '0') --num_digits; |
| if (num_zeros != 0 || num_digits != 0 || specs_.showpoint) { |
| *it++ = decimal_point_; |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| it = copy_str<Char>(digits_, digits_ + num_digits, it); |
| } |
| } |
| return it; |
| } |
| |
| public: |
| float_writer(const char* digits, int num_digits, int exp, float_specs specs, |
| Char decimal_point) |
| : digits_(digits), |
| num_digits_(num_digits), |
| exp_(exp), |
| specs_(specs), |
| decimal_point_(decimal_point) { |
| int full_exp = num_digits + exp - 1; |
| int precision = specs.precision > 0 ? specs.precision : 16; |
| if (specs_.format == float_format::general && |
| !(full_exp >= -4 && full_exp < precision)) { |
| specs_.format = float_format::exp; |
| } |
| size_ = prettify(counting_iterator()).count(); |
| size_ += specs.sign ? 1 : 0; |
| } |
| |
| size_t size() const { return size_; } |
| |
| template <typename It> It operator()(It it) const { |
| if (specs_.sign) *it++ = static_cast<Char>(data::signs[specs_.sign]); |
| return prettify(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; |
| } |
| 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"); |
| } |
| |
| 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"); |
| } |
| |
| template <typename ErrorHandler> class int_type_checker : private ErrorHandler { |
| public: |
| FMT_CONSTEXPR explicit int_type_checker(ErrorHandler eh) : ErrorHandler(eh) {} |
| |
| 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() {} |
| |
| FMT_CONSTEXPR void on_error() { |
| ErrorHandler::on_error("invalid type specifier"); |
| } |
| }; |
| |
| template <typename ErrorHandler> |
| class char_specs_checker : public ErrorHandler { |
| private: |
| char type_; |
| |
| public: |
| FMT_CONSTEXPR char_specs_checker(char type, ErrorHandler eh) |
| : ErrorHandler(eh), type_(type) {} |
| |
| FMT_CONSTEXPR void on_int() { |
| handle_int_type_spec(type_, int_type_checker<ErrorHandler>(*this)); |
| } |
| 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) {} |
| |
| FMT_CONSTEXPR void on_string() {} |
| FMT_CONSTEXPR void on_pointer() {} |
| }; |
| |
| template <typename OutputIt, typename Char> |
| FMT_NOINLINE OutputIt fill(OutputIt it, size_t n, const fill_t<Char>& fill) { |
| 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); |
| return it; |
| } |
| |
| // Writes the output of f, padded according to format specifications in specs. |
| // size: output size in code units. |
| // width: output display width in (terminal) column positions. |
| template <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, const F& f) { |
| 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; |
| size_t left_padding = padding >> shifts[specs.align]; |
| auto it = reserve(out, size + padding * specs.fill.size()); |
| it = fill(it, left_padding, specs.fill); |
| it = f(it); |
| it = fill(it, padding - left_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, |
| const F& f) { |
| return write_padded<align>(out, specs, size, size, f); |
| } |
| |
| 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); |
| }); |
| } |
| |
| // Data for write_int that doesn't depend on output iterator type. It is used to |
| // avoid template code bloat. |
| 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) { |
| if (specs.align == align::numeric) { |
| auto width = to_unsigned(specs.width); |
| if (width > size) { |
| padding = width - size; |
| size = width; |
| } |
| } else if (specs.precision > num_digits) { |
| size = prefix.size() + to_unsigned(specs.precision); |
| padding = to_unsigned(specs.precision - num_digits); |
| } |
| } |
| }; |
| |
| // 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) { |
| 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); |
| }); |
| } |
| |
| 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); |
| }); |
| } |
| |
| // 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; |
| } |
| } |
| |
| void on_dec() { |
| auto num_digits = count_digits(abs_value); |
| out = write_int( |
| out, num_digits, get_prefix(), specs, [this, num_digits](iterator 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; |
| } |
| 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'); |
| }); |
| } |
| |
| void on_bin() { |
| if (specs.alt) { |
| prefix[prefix_size++] = '0'; |
| prefix[prefix_size++] = static_cast<char>(specs.type); |
| } |
| 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); |
| }); |
| } |
| |
| void on_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 += prefix_size; |
| buffer.resize(size); |
| 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; |
| 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; |
| } |
| p -= s.size(); |
| std::uninitialized_copy(s.data(), s.data() + s.size(), |
| make_checked(p, s.size())); |
| } |
| if (prefix_size != 0) p[-1] = static_cast<Char>('-'); |
| write(out, basic_string_view<Char>(buffer.data(), buffer.size()), specs); |
| } |
| |
| void on_chr() { *out++ = static_cast<Char>(abs_value); } |
| |
| FMT_NORETURN void on_error() { |
| FMT_THROW(format_error("invalid type specifier")); |
| } |
| }; |
| |
| template <typename Char, typename OutputIt> |
| OutputIt write_nonfinite(OutputIt out, bool isinf, |
| const basic_format_specs<Char>& specs, |
| const float_specs& fspecs) { |
| auto str = |
| isinf ? (fspecs.upper ? "INF" : "inf") : (fspecs.upper ? "NAN" : "nan"); |
| 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]); |
| return copy_str<Char>(str, str + str_size, it); |
| }); |
| } |
| |
| 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 = {}) { |
| 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. |
| 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 (specs.align == align::numeric && fspecs.sign) { |
| auto it = reserve(out, 1); |
| *it++ = static_cast<Char>(data::signs[fspecs.sign]); |
| out = base_iterator(out, it); |
| fspecs.sign = sign::none; |
| if (specs.width != 0) --specs.width; |
| } |
| |
| memory_buffer buffer; |
| if (fspecs.format == float_format::hex) { |
| if (fspecs.sign) buffer.push_back(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.format == float_format::exp) { |
| if (precision == max_value<int>()) |
| FMT_THROW(format_error("number is too big")); |
| else |
| ++precision; |
| } |
| if (const_check(std::is_same<T, float>())) fspecs.binary32 = true; |
| fspecs.use_grisu = use_grisu<T>(); |
| int exp = format_float(promote_float(value), precision, fspecs, buffer); |
| fspecs.precision = precision; |
| Char point = |
| fspecs.locale ? decimal_point<Char>(loc) : static_cast<Char>('.'); |
| float_writer<Char> w(buffer.data(), static_cast<int>(buffer.size()), exp, |
| fspecs, point); |
| return write_padded<align::right>(out, specs, w.size(), w); |
| } |
| |
| template <typename Char, typename OutputIt, typename T, |
| FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| OutputIt write(OutputIt out, T value) { |
| if (const_check(!is_supported_floating_point(value))) return out; |
| auto fspecs = float_specs(); |
| if (std::signbit(value)) { // value < 0 is false for NaN so use signbit. |
| fspecs.sign = sign::minus; |
| value = -value; |
| } |
| |
| auto specs = basic_format_specs<Char>(); |
| if (!std::isfinite(value)) |
| return write_nonfinite(out, std::isinf(value), specs, fspecs); |
| |
| memory_buffer buffer; |
| int precision = -1; |
| if (const_check(std::is_same<T, float>())) fspecs.binary32 = true; |
| fspecs.use_grisu = use_grisu<T>(); |
| int exp = format_float(promote_float(value), precision, fspecs, buffer); |
| fspecs.precision = precision; |
| float_writer<Char> w(buffer.data(), static_cast<int>(buffer.size()), exp, |
| fspecs, static_cast<Char>('.')); |
| return base_iterator(out, w(reserve(out, w.size()))); |
| } |
| |
| 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) { |
| 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) { |
| auto it = reserve(out, value.size()); |
| it = std::copy(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_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); |
| } |
| |
| 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> |
| OutputIt write(OutputIt out, Char value) { |
| auto it = reserve(out, 1); |
| *it++ = value; |
| return base_iterator(out, it); |
| } |
| |
| template <typename Char, typename OutputIt> |
| OutputIt write(OutputIt out, const Char* value) { |
| if (!value) { |
| FMT_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)); |
| } |
| 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> |
| 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 { |
| basic_format_context<OutputIt, Char> ctx(out, {}, {}); |
| return formatter<T>().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>; |
| |
| OutputIt out; |
| basic_format_args<context> args; |
| locale_ref loc; |
| |
| template <typename T> OutputIt operator()(T value) { |
| return write<Char>(out, value); |
| } |
| |
| OutputIt operator()(typename basic_format_arg<context>::handle handle) { |
| basic_format_parse_context<Char> parse_ctx({}); |
| basic_format_context<OutputIt, Char> format_ctx(out, args, loc); |
| handle.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_; |
| } |
| |
| 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 operator()(const void* value) { |
| if (specs_) check_pointer_type_spec(specs_->type, error_handler()); |
| write_pointer(value); |
| 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) {} |
| |
| bool operator()(typename basic_format_arg<Context>::handle h) const { |
| h.format(parse_ctx_, ctx_); |
| return true; |
| } |
| |
| template <typename T> bool operator()(T) const { return false; } |
| }; |
| |
| template <typename T> |
| using is_integer = |
| bool_constant<is_integral<T>::value && !std::is_same<T, bool>::value && |
| !std::is_same<T, char>::value && |
| !std::is_same<T, wchar_t>::value>; |
| |
| template <typename ErrorHandler> class width_checker { |
| public: |
| 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) { |
| 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) { |
| handler_.on_error("width is not integer"); |
| return 0; |
| } |
| |
| private: |
| ErrorHandler& handler_; |
| }; |
| |
| template <typename ErrorHandler> class precision_checker { |
| public: |
| 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) { |
| 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) { |
| handler_.on_error("precision is not integer"); |
| return 0; |
| } |
| |
| private: |
| 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) { |
| 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) { |
| 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); } |
| |
| private: |
| // This is only needed for compatibility with gcc 4.4. |
| using format_arg = typename Context::format_arg; |
| |
| FMT_CONSTEXPR format_arg get_arg(auto_id) { |
| return detail::get_arg(context_, parse_context_.next_arg_id()); |
| } |
| |
| FMT_CONSTEXPR format_arg get_arg(int arg_id) { |
| 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) { |
| 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_) {} |
| |
| template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
| specs_.width_ref = make_arg_ref(arg_id); |
| } |
| |
| 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); |
| } |
| |
| SpecHandler& handler; |
| }; |
| |
| template <typename Char> |
| FMT_CONSTEXPR const Char* next_code_point(const Char* begin, const Char* end) { |
| if (const_check(sizeof(Char) != 1) || (*begin & 0x80) == 0) return begin + 1; |
| do { |
| ++begin; |
| } while (begin != end && (*begin & 0xc0) == 0x80); |
| return begin; |
| } |
| |
| // 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 = next_code_point(begin, end); |
| if (p == end) p = begin; |
| for (;;) { |
| switch (static_cast<char>(*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 || *begin == '}') return begin; |
| |
| begin = parse_align(begin, end, handler); |
| if (begin == end) return begin; |
| |
| // Parse sign. |
| switch (static_cast<char>(*begin)) { |
| case '+': |
| handler.on_plus(); |
| ++begin; |
| break; |
| case '-': |
| handler.on_minus(); |
| ++begin; |
| break; |
| case ' ': |
| handler.on_space(); |
| ++begin; |
| 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; |
| |
| 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 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 (static_cast<char>(*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* begin, const Char* end) { |
| if (begin == end) return; |
| for (;;) { |
| const Char* p = nullptr; |
| if (!find<IS_CONSTEXPR>(begin, end, '}', p)) |
| return handler_.on_text(begin, end); |
| ++p; |
| if (p == end || *p != '}') |
| return handler_.on_error("unmatched '}' in format string"); |
| handler_.on_text(begin, p); |
| begin = 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 ArgFormatter, typename Char, typename Context> |
| struct format_handler : detail::error_handler { |
| basic_format_parse_context<Char> parse_context; |
| Context context; |
| |
| format_handler(typename ArgFormatter::iterator 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<typename ArgFormatter::iterator, Char>{ |
| context.out(), context.args(), context.locale()}, |
| arg)); |
| } |
| |
| const Char* on_format_specs(int id, const Char* begin, const Char* end) { |
| advance_to(parse_context, begin); |
| auto arg = get_arg(context, id); |
| custom_formatter<Context> f(parse_context, context); |
| if (visit_format_arg(f, arg)) return parse_context.begin(); |
| basic_format_specs<Char> specs; |
| 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"); |
| advance_to(parse_context, begin); |
| context.advance_to( |
| visit_format_arg(ArgFormatter(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) {} |
| |
| 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; |
| }; |
| |
| 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>...} {} |
| |
| FMT_CONSTEXPR void on_text(const Char*, const Char*) {} |
| |
| 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; |
| } |
| |
| FMT_CONSTEXPR void on_error(const char* message) { |
| context_.on_error(message); |
| } |
| |
| 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]; |
| }; |
| |
| // 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; |
| } |
| } |
| |
| using format_func = void (*)(detail::buffer<char>&, int, string_view); |
| |
| FMT_API void format_error_code(buffer<char>& out, int error_code, |
| string_view message) FMT_NOEXCEPT; |
| |
| FMT_API void report_error(format_func func, int error_code, |
| string_view message) FMT_NOEXCEPT; |
| |
| /** 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(); |
| } |
| }; |
| } // namespace detail |
| |
| template <typename OutputIt, typename Char> |
| using arg_formatter FMT_DEPRECATED_ALIAS = |
| detail::arg_formatter<OutputIt, Char>; |
| |
| /** |
| 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_; |
| |
| system_error() : std::runtime_error(""), error_code_(0) {} |
| |
| 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_; } |
| }; |
| |
| /** |
| \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: |
| |
| .. parsed-literal:: |
| *<message>*: *<system-message>* |
| |
| 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; |
| |
| // 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; |
| |
| /** Fast integer formatter. */ |
| class format_int { |
| private: |
| // Buffer should be large enough to hold all digits (digits10 + 1), |
| // a sign and a null character. |
| enum { buffer_size = std::numeric_limits<unsigned long long>::digits10 + 3 }; |
| mutable char buffer_[buffer_size]; |
| char* str_; |
| |
| template <typename UInt> char* format_unsigned(UInt value) { |
| 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) { |
| 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; |
| auto begin = format_unsigned(abs_value); |
| if (negative) *--begin = '-'; |
| return begin; |
| } |
| |
| public: |
| explicit format_int(int value) : str_(format_signed(value)) {} |
| explicit format_int(long value) : str_(format_signed(value)) {} |
| explicit format_int(long long value) : str_(format_signed(value)) {} |
| explicit format_int(unsigned value) : str_(format_unsigned(value)) {} |
| explicit format_int(unsigned long value) : str_(format_unsigned(value)) {} |
| explicit format_int(unsigned long long value) |
| : str_(format_unsigned(value)) {} |
| |
| /** Returns the number of characters written to the output buffer. */ |
| size_t size() const { |
| return detail::to_unsigned(buffer_ - str_ + buffer_size - 1); |
| } |
| |
| /** |
| Returns a pointer to the output buffer content. No terminating null |
| character is appended. |
| */ |
| const char* data() const { return str_; } |
| |
| /** |
| Returns a pointer to the output buffer content with terminating null |
| character appended. |
| */ |
| const char* c_str() const { |
| buffer_[buffer_size - 1] = '\0'; |
| return str_; |
| } |
| |
| /** |
| \rst |
| Returns the content of the output buffer as an ``std::string``. |
| \endrst |
| */ |
| std::string str() const { 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); |
| 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)); |
| } |
| |
| 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>); |
| |
| template <typename Char> |
| struct formatter<void*, Char> : formatter<const void*, Char> { |
| template <typename FormatContext> |
| auto format(void* val, FormatContext& ctx) -> decltype(ctx.out()) { |
| return formatter<const void*, Char>::format(val, ctx); |
| } |
| }; |
| |
| 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()) { |
| return formatter<basic_string_view<Char>, Char>::format(val, ctx); |
| } |
| }; |
| |
| // A formatter for types known only at run time such as variant alternatives. |
| // |
| // Usage: |
| // using variant = std::variant<int, std::string>; |
| // template <> |
| // struct formatter<variant>: dynamic_formatter<> { |
| // void format(buffer &buf, const variant &v, context &ctx) { |
| // visit([&](const auto &val) { format(buf, val, ctx); }, v); |
| // } |
| // }; |
| template <typename Char = char> class dynamic_formatter { |
| private: |
| struct null_handler : detail::error_handler { |
| void on_align(align_t) {} |
| void on_plus() {} |
| void on_minus() {} |
| void on_space() {} |
| void on_hash() {} |
| }; |
| |
| public: |
| template <typename ParseContext> |
| 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); |
| } |
| |
| template <typename T, typename FormatContext> |
| auto format(const T& val, FormatContext& ctx) -> decltype(ctx.out()) { |
| handle_specs(ctx); |
| 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_.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(); |
| } |
| |
| 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())); |
| } |
| |
| /** Formats arguments and writes the output to the range. */ |
| template <typename ArgFormatter, typename Char, typename Context> |
| typename Context::iterator vformat_to( |
| typename ArgFormatter::iterator out, basic_string_view<Char> format_str, |
| basic_format_args<Context> args, |
| detail::locale_ref loc = detail::locale_ref()) { |
| if (format_str.size() == 2 && detail::equal2(format_str.data(), "{}")) { |
| auto arg = args.get(0); |
| if (!arg) detail::error_handler().on_error("argument not found"); |
| using iterator = typename ArgFormatter::iterator; |
| return visit_format_arg( |
| detail::default_arg_formatter<iterator, Char>{out, args, loc}, arg); |
| } |
| detail::format_handler<ArgFormatter, Char, Context> h(out, format_str, args, |
| loc); |
| detail::parse_format_string<false>(format_str, h); |
| return h.context.out(); |
| } |
| |
| // Casts ``p`` to ``const void*`` for pointer formatting. |
| // Example: |
| // auto s = format("{}", ptr(p)); |
| 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) { |
| return p.get(); |
| } |
| template <typename T> inline const void* ptr(const std::shared_ptr<T>& p) { |
| return p.get(); |
| } |
| |
| class bytes { |
| private: |
| string_view data_; |
| friend struct formatter<bytes>; |
| |
| public: |
| explicit bytes(string_view data) : data_(data) {} |
| }; |
| |
| template <> struct formatter<bytes> { |
| 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::string_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(bytes b, 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_bytes(ctx.out(), b.data_, specs_); |
| } |
| |
| private: |
| detail::dynamic_format_specs<char> specs_; |
| }; |
| |
| template <typename It, typename Sentinel, typename Char> |
| struct arg_join : detail::view { |
| It begin; |
| Sentinel end; |
| basic_string_view<Char> sep; |
| |
| arg_join(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> { |
| 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 it = value.begin; |
| auto out = ctx.out(); |
| if (it != value.end) { |
| out = base::format(*it++, ctx); |
| while (it != value.end) { |
| out = std::copy(value.sep.begin(), value.sep.end(), out); |
| ctx.advance_to(out); |
| out = base::format(*it++, ctx); |
| } |
| } |
| return out; |
| } |
| }; |
| |
| /** |
| Returns an object 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) { |
| return {begin, end, sep}; |
| } |
| |
| /** |
| \rst |
| Returns an object that formats `range` with elements separated by `sep`. |
| |
| **Example**:: |
| |
| std::vector<int> v = {1, 2, 3}; |
| fmt::print("{}", fmt::join(v, ", ")); |
| // Output: "1, 2, 3" |
| |
| ``fmt::join`` applies passed format specifiers to the range elements:: |
| |
| fmt::print("{:02}", fmt::join(v, ", ")); |
| // Output: "01, 02, 03" |
| \endrst |
| */ |
| template <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) { |
| return join(std::begin(range), std::end(range), sep); |
| } |
| |
| /** |
| \rst |
| Converts *value* to ``std::string`` using the default format for type *T*. |
| |
| **Example**:: |
| |
| #include <fmt/format.h> |
| |
| std::string answer = fmt::to_string(42); |
| \endrst |
| */ |
| template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)> |
| inline std::string to_string(const T& value) { |
| std::string result; |
| 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. |
| constexpr int max_size = detail::digits10<T>() + 2; |
| char buffer[max_size > 5 ? 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) { |
| auto size = buf.size(); |
| detail::assume(size < std::basic_string<Char>().max_size()); |
| return std::basic_string<Char>(buf.data(), size); |
| } |
| |
| template <typename Char> |
| detail::buffer_appender<Char> detail::vformat_to( |
| detail::buffer<Char>& buf, basic_string_view<Char> format_str, |
| basic_format_args<buffer_context<type_identity_t<Char>>> args) { |
| using af = arg_formatter<typename buffer_context<Char>::iterator, Char>; |
| return vformat_to<af>(buffer_appender<Char>(buf), format_str, args); |
| } |
| |
| #ifndef FMT_HEADER_ONLY |
| extern template format_context::iterator detail::vformat_to( |
| detail::buffer<char>&, string_view, basic_format_args<format_context>); |
| namespace detail { |
| 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 typename FMT_BUFFER_CONTEXT(Char)::iterator 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...); |
| return detail::vformat_to(buf, to_string_view(format_str), vargs); |
| } |
| |
| 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> struct format_to_n_result { |
| /** Iterator past the end of the output range. */ |
| OutputIt out; |
| /** Total (not truncated) output size. */ |
| size_t size; |
| }; |
| |
| template <typename OutputIt, typename Char = typename OutputIt::value_type> |
| using format_to_n_context FMT_DEPRECATED_ALIAS = buffer_context<Char>; |
| |
| template <typename OutputIt, typename Char = typename OutputIt::value_type> |
| using format_to_n_args FMT_DEPRECATED_ALIAS = |
| basic_format_args<buffer_context<Char>>; |
| |
| 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...); |
| } |
| |
| template <typename OutputIt, typename Char, typename... Args, |
| FMT_ENABLE_IF(detail::is_output_iterator<OutputIt>::value)> |
| inline format_to_n_result<OutputIt> vformat_to_n( |
| OutputIt out, size_t n, basic_string_view<Char> format_str, |
| basic_format_args<buffer_context<type_identity_t<Char>>> args) { |
| auto it = vformat_to(detail::truncating_iterator<OutputIt>(out, n), |
| format_str, args); |
| return {it.base(), it.count()}; |
| } |
| |
| /** |
| \rst |
| Formats arguments, writes up to ``n`` characters of the result to the output |
| iterator ``out`` and returns the total output size and the iterator past the |
| end of the output range. |
| \endrst |
| */ |
| template <typename OutputIt, typename S, typename... Args, |
| FMT_ENABLE_IF(detail::is_string<S>::value&& |
| detail::is_output_iterator<OutputIt>::value)> |
| inline format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n, |
| const S& format_str, |
| const Args&... args) { |
| const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...); |
| return vformat_to_n(out, n, to_string_view(format_str), vargs); |
| } |
| |
| 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); |
| } |
| |
| /** |
| Returns the number of characters in the output of |
| ``format(format_str, args...)``. |
| */ |
| template <typename... Args> |
| inline size_t formatted_size(string_view format_str, const Args&... args) { |
| return format_to(detail::counting_iterator(), format_str, args...).count(); |
| } |
| |
| 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")); |
| } |
| |
| 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); |
| } |
| |
| #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`. |
| |
| **Example**:: |
| |
| using namespace fmt::literals; |
| 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}; |
| } |
| FMT_CONSTEXPR detail::udl_arg<wchar_t> operator"" _a(const wchar_t* s, size_t) { |
| return {s}; |
| } |
| } // namespace literals |
| #endif // FMT_USE_USER_DEFINED_LITERALS |
| FMT_END_NAMESPACE |
| |
| #ifdef FMT_HEADER_ONLY |
| # define FMT_FUNC inline |
| # include "format-inl.h" |
| #else |
| # define FMT_FUNC |
| #endif |
| |
| #endif // FMT_FORMAT_H_ |