| /* |
| Formatting library for C++ |
| |
| Copyright (c) 2012 - present, Victor Zverovich |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| 1. Redistributions of source code must retain the above copyright notice, this |
| list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
| ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR |
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef FMT_FORMAT_H_ |
| #define FMT_FORMAT_H_ |
| |
| #include <algorithm> |
| #include <cassert> |
| #include <cmath> |
| #include <cstring> |
| #include <limits> |
| #include <memory> |
| #include <stdexcept> |
| #include <stdint.h> |
| |
| #ifdef __clang__ |
| # define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__) |
| #else |
| # define FMT_CLANG_VERSION 0 |
| #endif |
| |
| #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 |
| |
| #include "core.h" |
| |
| #if FMT_GCC_VERSION >= 406 || FMT_CLANG_VERSION |
| # pragma GCC diagnostic push |
| |
| // Disable the warning about declaration shadowing because it affects too |
| // many valid cases. |
| # pragma GCC diagnostic ignored "-Wshadow" |
| |
| // Disable the warning about nonliteral format strings because we construct |
| // them dynamically when falling back to snprintf for FP formatting. |
| # pragma GCC diagnostic ignored "-Wformat-nonliteral" |
| #endif |
| |
| # if FMT_CLANG_VERSION |
| # pragma GCC diagnostic ignored "-Wgnu-string-literal-operator-template" |
| # endif |
| |
| #ifdef _SECURE_SCL |
| # define FMT_SECURE_SCL _SECURE_SCL |
| #else |
| # define FMT_SECURE_SCL 0 |
| #endif |
| |
| #if FMT_SECURE_SCL |
| # include <iterator> |
| #endif |
| |
| #ifdef __has_builtin |
| # define FMT_HAS_BUILTIN(x) __has_builtin(x) |
| #else |
| # define FMT_HAS_BUILTIN(x) 0 |
| #endif |
| |
| #ifdef __GNUC_LIBSTD__ |
| # define FMT_GNUC_LIBSTD_VERSION (__GNUC_LIBSTD__ * 100 + __GNUC_LIBSTD_MINOR__) |
| #endif |
| |
| #ifndef FMT_THROW |
| # if FMT_EXCEPTIONS |
| # if FMT_MSC_VER |
| FMT_BEGIN_NAMESPACE |
| namespace internal { |
| template <typename Exception> |
| inline void do_throw(const Exception &x) { |
| // Silence unreachable code warnings in MSVC because these are nearly |
| // impossible to fix in a generic code. |
| volatile bool b = true; |
| if (b) |
| throw x; |
| } |
| } |
| FMT_END_NAMESPACE |
| # define FMT_THROW(x) fmt::internal::do_throw(x) |
| # else |
| # define FMT_THROW(x) throw x |
| # endif |
| # else |
| # define FMT_THROW(x) do { static_cast<void>(sizeof(x)); assert(false); } while(false); |
| # endif |
| #endif |
| |
| #ifndef FMT_USE_USER_DEFINED_LITERALS |
| // For Intel's compiler and NVIDIA's compiler both it and the system gcc/msc |
| // must support UDLs. |
| # if (FMT_HAS_FEATURE(cxx_user_literals) || \ |
| FMT_GCC_VERSION >= 407 || FMT_MSC_VER >= 1900) && \ |
| (!(FMT_ICC_VERSION || FMT_CUDA_VERSION) || \ |
| FMT_ICC_VERSION >= 1500 || FMT_CUDA_VERSION >= 700) |
| # define FMT_USE_USER_DEFINED_LITERALS 1 |
| # else |
| # define FMT_USE_USER_DEFINED_LITERALS 0 |
| # endif |
| #endif |
| |
| // EDG C++ Front End based compilers (icc, nvcc) do not currently support UDL |
| // templates. |
| #if FMT_USE_USER_DEFINED_LITERALS && \ |
| FMT_ICC_VERSION == 0 && \ |
| FMT_CUDA_VERSION == 0 && \ |
| ((FMT_GCC_VERSION >= 600 && __cplusplus >= 201402L) || \ |
| (defined(FMT_CLANG_VERSION) && FMT_CLANG_VERSION >= 304)) |
| # define FMT_UDL_TEMPLATE 1 |
| #else |
| # define FMT_UDL_TEMPLATE 0 |
| #endif |
| |
| #ifndef FMT_USE_EXTERN_TEMPLATES |
| # ifndef FMT_HEADER_ONLY |
| # define FMT_USE_EXTERN_TEMPLATES \ |
| ((FMT_CLANG_VERSION >= 209 && __cplusplus >= 201103L) || \ |
| (FMT_GCC_VERSION >= 303 && FMT_HAS_GXX_CXX11)) |
| # else |
| # define FMT_USE_EXTERN_TEMPLATES 0 |
| # endif |
| #endif |
| |
| #if FMT_HAS_GXX_CXX11 || FMT_HAS_FEATURE(cxx_trailing_return) || \ |
| FMT_MSC_VER >= 1600 |
| # define FMT_USE_TRAILING_RETURN 1 |
| #else |
| # define FMT_USE_TRAILING_RETURN 0 |
| #endif |
| |
| #ifndef FMT_USE_GRISU |
| # define FMT_USE_GRISU 0 |
| //# define FMT_USE_GRISU std::numeric_limits<double>::is_iec559 |
| #endif |
| |
| // __builtin_clz is broken in clang with Microsoft CodeGen: |
| // https://github.com/fmtlib/fmt/issues/519 |
| #ifndef _MSC_VER |
| # if FMT_GCC_VERSION >= 400 || FMT_HAS_BUILTIN(__builtin_clz) |
| # define FMT_BUILTIN_CLZ(n) __builtin_clz(n) |
| # endif |
| |
| # if FMT_GCC_VERSION >= 400 || FMT_HAS_BUILTIN(__builtin_clzll) |
| # define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n) |
| # endif |
| #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 internal { |
| // 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); |
| |
| 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. |
| # pragma warning(suppress: 6102) |
| return 31 - r; |
| } |
| # define FMT_BUILTIN_CLZ(n) fmt::internal::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 |
| |
| 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. |
| # pragma warning(suppress: 6102) |
| return 63 - r; |
| } |
| # define FMT_BUILTIN_CLZLL(n) fmt::internal::clzll(n) |
| } |
| FMT_END_NAMESPACE |
| #endif |
| |
| FMT_BEGIN_NAMESPACE |
| namespace internal { |
| |
| // An equivalent of `*reinterpret_cast<Dest*>(&source)` that doesn't produce |
| // 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; |
| } |
| |
| // An implementation of begin and end for pre-C++11 compilers such as gcc 4. |
| template <typename C> |
| FMT_CONSTEXPR auto begin(const C &c) -> decltype(c.begin()) { |
| return c.begin(); |
| } |
| template <typename T, std::size_t N> |
| FMT_CONSTEXPR T *begin(T (&array)[N]) FMT_NOEXCEPT { return array; } |
| template <typename C> |
| FMT_CONSTEXPR auto end(const C &c) -> decltype(c.end()) { return c.end(); } |
| template <typename T, std::size_t N> |
| FMT_CONSTEXPR T *end(T (&array)[N]) FMT_NOEXCEPT { return array + N; } |
| |
| // For std::result_of in gcc 4.4. |
| template <typename Result> |
| struct function { |
| template <typename T> |
| struct result { typedef Result type; }; |
| }; |
| |
| struct dummy_int { |
| int data[2]; |
| operator int() const { return 0; } |
| }; |
| typedef std::numeric_limits<internal::dummy_int> fputil; |
| |
| // Dummy implementations of system functions called if the latter are not |
| // available. |
| inline dummy_int isinf(...) { return dummy_int(); } |
| inline dummy_int _finite(...) { return dummy_int(); } |
| inline dummy_int isnan(...) { return dummy_int(); } |
| inline dummy_int _isnan(...) { return dummy_int(); } |
| |
| template <typename Allocator> |
| typename Allocator::value_type *allocate(Allocator& alloc, std::size_t n) { |
| #if __cplusplus >= 201103L || FMT_MSC_VER >= 1700 |
| return std::allocator_traits<Allocator>::allocate(alloc, n); |
| #else |
| return alloc.allocate(n); |
| #endif |
| } |
| |
| // A helper function to suppress bogus "conditional expression is constant" |
| // warnings. |
| template <typename T> |
| inline T const_check(T value) { return value; } |
| } // namespace internal |
| FMT_END_NAMESPACE |
| |
| namespace std { |
| // Standard permits specialization of std::numeric_limits. This specialization |
| // is used to resolve ambiguity between isinf and std::isinf in glibc: |
| // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48891 |
| // and the same for isnan. |
| template <> |
| class numeric_limits<fmt::internal::dummy_int> : |
| public std::numeric_limits<int> { |
| public: |
| // Portable version of isinf. |
| template <typename T> |
| static bool isinfinity(T x) { |
| using namespace fmt::internal; |
| // The resolution "priority" is: |
| // isinf macro > std::isinf > ::isinf > fmt::internal::isinf |
| if (const_check(sizeof(isinf(x)) != sizeof(fmt::internal::dummy_int))) |
| return isinf(x) != 0; |
| return !_finite(static_cast<double>(x)); |
| } |
| |
| // Portable version of isnan. |
| template <typename T> |
| static bool isnotanumber(T x) { |
| using namespace fmt::internal; |
| if (const_check(sizeof(isnan(x)) != sizeof(fmt::internal::dummy_int))) |
| return isnan(x) != 0; |
| return _isnan(static_cast<double>(x)) != 0; |
| } |
| }; |
| } // namespace std |
| |
| FMT_BEGIN_NAMESPACE |
| template <typename Range> |
| class basic_writer; |
| |
| template <typename OutputIt, typename T = typename OutputIt::value_type> |
| class output_range { |
| private: |
| OutputIt it_; |
| |
| // Unused yet. |
| typedef void sentinel; |
| sentinel end() const; |
| |
| public: |
| typedef OutputIt iterator; |
| typedef T value_type; |
| |
| explicit output_range(OutputIt it): it_(it) {} |
| OutputIt begin() const { return it_; } |
| }; |
| |
| // A range where begin() returns back_insert_iterator. |
| template <typename Container> |
| class back_insert_range: |
| public output_range<std::back_insert_iterator<Container>> { |
| typedef output_range<std::back_insert_iterator<Container>> base; |
| public: |
| typedef typename Container::value_type value_type; |
| |
| back_insert_range(Container &c): base(std::back_inserter(c)) {} |
| back_insert_range(typename base::iterator it): base(it) {} |
| }; |
| |
| typedef basic_writer<back_insert_range<internal::buffer>> writer; |
| typedef basic_writer<back_insert_range<internal::wbuffer>> wwriter; |
| |
| /** A formatting error such as invalid format string. */ |
| class 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) {} |
| }; |
| |
| namespace internal { |
| |
| #if FMT_SECURE_SCL |
| template <typename T> |
| struct checked { typedef stdext::checked_array_iterator<T*> type; }; |
| |
| // Make a checked iterator to avoid warnings on MSVC. |
| template <typename T> |
| inline stdext::checked_array_iterator<T*> make_checked(T *p, std::size_t size) { |
| return {p, size}; |
| } |
| #else |
| template <typename T> |
| struct checked { typedef T *type; }; |
| template <typename T> |
| inline T *make_checked(T *p, std::size_t) { return p; } |
| #endif |
| |
| template <typename T> |
| template <typename U> |
| void basic_buffer<T>::append(const U *begin, const U *end) { |
| std::size_t new_size = size_ + internal::to_unsigned(end - begin); |
| reserve(new_size); |
| std::uninitialized_copy(begin, end, |
| internal::make_checked(ptr_, capacity_) + size_); |
| size_ = new_size; |
| } |
| } // namespace internal |
| |
| // C++20 feature test, since r346892 Clang considers char8_t a fundamental |
| // type in this mode. If this is the case __cpp_char8_t will be defined. |
| #if !defined(__cpp_char8_t) |
| // A UTF-8 code unit type. |
| enum char8_t: unsigned char {}; |
| #endif |
| |
| // A UTF-8 string view. |
| class u8string_view : public basic_string_view<char8_t> { |
| public: |
| typedef char8_t char_type; |
| |
| u8string_view(const char *s): |
| basic_string_view<char8_t>(reinterpret_cast<const char8_t*>(s)) {} |
| u8string_view(const char *s, size_t count) FMT_NOEXCEPT: |
| basic_string_view<char8_t>(reinterpret_cast<const char8_t*>(s), count) {} |
| }; |
| |
| #if FMT_USE_USER_DEFINED_LITERALS |
| inline namespace literals { |
| inline u8string_view operator"" _u(const char *s, std::size_t n) { |
| return {s, n}; |
| } |
| } |
| #endif |
| |
| // 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 typedefs 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, std::size_t SIZE = inline_buffer_size, |
| typename Allocator = std::allocator<T> > |
| class basic_memory_buffer: private Allocator, public internal::basic_buffer<T> { |
| private: |
| T store_[SIZE]; |
| |
| // Deallocate memory allocated by the buffer. |
| void deallocate() { |
| T* data = this->data(); |
| if (data != store_) Allocator::deallocate(data, this->capacity()); |
| } |
| |
| protected: |
| void grow(std::size_t size) FMT_OVERRIDE; |
| |
| public: |
| typedef T value_type; |
| typedef const T &const_reference; |
| |
| explicit basic_memory_buffer(const Allocator &alloc = Allocator()) |
| : Allocator(alloc) { |
| this->set(store_, SIZE); |
| } |
| ~basic_memory_buffer() { deallocate(); } |
| |
| private: |
| // Move data from other to this buffer. |
| void move(basic_memory_buffer &other) { |
| Allocator &this_alloc = *this, &other_alloc = other; |
| this_alloc = std::move(other_alloc); |
| T* data = other.data(); |
| std::size_t size = other.size(), capacity = other.capacity(); |
| if (data == other.store_) { |
| this->set(store_, capacity); |
| std::uninitialized_copy(other.store_, other.store_ + size, |
| internal::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) { |
| 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) { |
| assert(this != &other); |
| deallocate(); |
| move(other); |
| return *this; |
| } |
| |
| // Returns a copy of the allocator associated with this buffer. |
| Allocator get_allocator() const { return *this; } |
| }; |
| |
| template <typename T, std::size_t SIZE, typename Allocator> |
| void basic_memory_buffer<T, SIZE, Allocator>::grow(std::size_t size) { |
| std::size_t old_capacity = this->capacity(); |
| std::size_t new_capacity = old_capacity + old_capacity / 2; |
| if (size > new_capacity) |
| new_capacity = size; |
| T *old_data = this->data(); |
| T *new_data = internal::allocate<Allocator>(*this, 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(), |
| internal::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_) |
| Allocator::deallocate(old_data, old_capacity); |
| } |
| |
| typedef basic_memory_buffer<char> memory_buffer; |
| typedef basic_memory_buffer<wchar_t> wmemory_buffer; |
| |
| namespace internal { |
| |
| template <typename Char> |
| struct char_traits; |
| |
| template <> |
| struct char_traits<char> { |
| // Formats a floating-point number. |
| template <typename T> |
| FMT_API static int format_float(char *buffer, std::size_t size, |
| const char *format, int precision, T value); |
| }; |
| |
| template <> |
| struct char_traits<wchar_t> { |
| template <typename T> |
| FMT_API static int format_float(wchar_t *buffer, std::size_t size, |
| const wchar_t *format, int precision, T value); |
| }; |
| |
| #if FMT_USE_EXTERN_TEMPLATES |
| extern template int char_traits<char>::format_float<double>( |
| char *buffer, std::size_t size, const char* format, int precision, |
| double value); |
| extern template int char_traits<char>::format_float<long double>( |
| char *buffer, std::size_t size, const char* format, int precision, |
| long double value); |
| |
| extern template int char_traits<wchar_t>::format_float<double>( |
| wchar_t *buffer, std::size_t size, const wchar_t* format, int precision, |
| double value); |
| extern template int char_traits<wchar_t>::format_float<long double>( |
| wchar_t *buffer, std::size_t size, const wchar_t* format, int precision, |
| long double value); |
| #endif |
| |
| template <typename Container> |
| inline typename std::enable_if< |
| is_contiguous<Container>::value, |
| typename checked<typename Container::value_type>::type>::type |
| reserve(std::back_insert_iterator<Container> &it, std::size_t n) { |
| Container &c = internal::get_container(it); |
| std::size_t size = c.size(); |
| c.resize(size + n); |
| return make_checked(&c[size], n); |
| } |
| |
| template <typename Iterator> |
| inline Iterator &reserve(Iterator &it, std::size_t) { return it; } |
| |
| template <typename Char> |
| class null_terminating_iterator; |
| |
| template <typename Char> |
| FMT_CONSTEXPR_DECL const Char *pointer_from(null_terminating_iterator<Char> it); |
| |
| // An output iterator that counts the number of objects written to it and |
| // discards them. |
| template <typename T> |
| class counting_iterator { |
| private: |
| std::size_t count_; |
| mutable T blackhole_; |
| |
| public: |
| typedef std::output_iterator_tag iterator_category; |
| typedef T value_type; |
| typedef std::ptrdiff_t difference_type; |
| typedef T* pointer; |
| typedef T& reference; |
| typedef counting_iterator _Unchecked_type; // Mark iterator as checked. |
| |
| counting_iterator(): count_(0) {} |
| |
| std::size_t count() const { return count_; } |
| |
| counting_iterator& operator++() { |
| ++count_; |
| return *this; |
| } |
| |
| counting_iterator operator++(int) { |
| auto it = *this; |
| ++*this; |
| return it; |
| } |
| |
| T &operator*() const { return blackhole_; } |
| }; |
| |
| template <typename OutputIt> |
| class truncating_iterator_base { |
| protected: |
| OutputIt out_; |
| std::size_t limit_; |
| std::size_t count_; |
| |
| truncating_iterator_base(OutputIt out, std::size_t limit) |
| : out_(out), limit_(limit), count_(0) {} |
| |
| public: |
| typedef std::output_iterator_tag iterator_category; |
| typedef void difference_type; |
| typedef void pointer; |
| typedef void reference; |
| typedef truncating_iterator_base _Unchecked_type; // Mark iterator as checked. |
| |
| OutputIt base() const { return out_; } |
| std::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> { |
| typedef std::iterator_traits<OutputIt> traits; |
| |
| mutable typename traits::value_type blackhole_; |
| |
| public: |
| typedef typename traits::value_type value_type; |
| |
| truncating_iterator(OutputIt out, std::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: |
| typedef typename OutputIt::container_type::value_type value_type; |
| |
| truncating_iterator(OutputIt out, std::size_t limit) |
| : truncating_iterator_base<OutputIt>(out, limit) {} |
| |
| truncating_iterator& operator=(value_type 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; } |
| }; |
| |
| // 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_CONSTEXPR typename std::enable_if< |
| std::numeric_limits<T>::is_signed, bool>::type is_negative(T value) { |
| return value < 0; |
| } |
| template <typename T> |
| FMT_CONSTEXPR typename std::enable_if< |
| !std::numeric_limits<T>::is_signed, bool>::type is_negative(T) { |
| return false; |
| } |
| |
| template <typename T> |
| struct int_traits { |
| // Smallest of uint32_t and uint64_t that is large enough to represent |
| // all values of T. |
| typedef typename std::conditional< |
| std::numeric_limits<T>::digits <= 32, uint32_t, uint64_t>::type main_type; |
| }; |
| |
| // Static data is placed in this class template to allow header-only |
| // configuration. |
| template <typename T = void> |
| struct FMT_API basic_data { |
| static const uint32_t POWERS_OF_10_32[]; |
| 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[]; |
| static const char DIGITS[]; |
| static const char FOREGROUND_COLOR[]; |
| static const char BACKGROUND_COLOR[]; |
| static const char RESET_COLOR[]; |
| static const wchar_t WRESET_COLOR[]; |
| }; |
| |
| #if FMT_USE_EXTERN_TEMPLATES |
| extern template struct basic_data<void>; |
| #endif |
| |
| typedef basic_data<> 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 |
| |
| 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. |
| FMT_API size_t count_code_points(basic_string_view<char8_t> s); |
| |
| inline char8_t to_char8_t(char c) { return static_cast<char8_t>(c); } |
| |
| template <typename InputIt, typename OutChar> |
| struct needs_conversion: std::integral_constant<bool, |
| std::is_same< |
| typename std::iterator_traits<InputIt>::value_type, char>::value && |
| std::is_same<OutChar, char8_t>::value> {}; |
| |
| template <typename OutChar, typename InputIt, typename OutputIt> |
| typename std::enable_if< |
| !needs_conversion<InputIt, OutChar>::value, OutputIt>::type |
| copy_str(InputIt begin, InputIt end, OutputIt it) { |
| return std::copy(begin, end, it); |
| } |
| |
| template <typename OutChar, typename InputIt, typename OutputIt> |
| typename std::enable_if< |
| needs_conversion<InputIt, OutChar>::value, OutputIt>::type |
| copy_str(InputIt begin, InputIt end, OutputIt it) { |
| return std::transform(begin, end, it, to_char8_t); |
| } |
| |
| #if FMT_HAS_CPP_ATTRIBUTE(always_inline) |
| # define FMT_ALWAYS_INLINE __attribute__((always_inline)) |
| #else |
| # define FMT_ALWAYS_INLINE |
| #endif |
| |
| template <typename Handler> |
| inline char *lg(uint32_t n, Handler h) FMT_ALWAYS_INLINE; |
| |
| // Computes g = floor(log10(n)) and calls h.on<g>(n); |
| template <typename Handler> |
| inline char *lg(uint32_t n, Handler h) { |
| return n < 100 ? n < 10 ? h.template on<0>(n) : h.template on<1>(n) |
| : n < 1000000 |
| ? n < 10000 ? n < 1000 ? h.template on<2>(n) |
| : h.template on<3>(n) |
| : n < 100000 ? h.template on<4>(n) |
| : h.template on<5>(n) |
| : n < 100000000 ? n < 10000000 ? h.template on<6>(n) |
| : h.template on<7>(n) |
| : n < 1000000000 ? h.template on<8>(n) |
| : h.template on<9>(n); |
| } |
| |
| // An lg handler that formats a decimal number. |
| // Usage: lg(n, decimal_formatter(buffer)); |
| class decimal_formatter { |
| private: |
| char *buffer_; |
| |
| void write_pair(unsigned N, uint32_t index) { |
| std::memcpy(buffer_ + N, data::DIGITS + index * 2, 2); |
| } |
| |
| public: |
| explicit decimal_formatter(char *buf) : buffer_(buf) {} |
| |
| template <unsigned N> char *on(uint32_t u) { |
| if (N == 0) { |
| *buffer_ = static_cast<char>(u) + '0'; |
| } else if (N == 1) { |
| write_pair(0, u); |
| } else { |
| // The idea of using 4.32 fixed-point numbers is based on |
| // https://github.com/jeaiii/itoa |
| unsigned n = N - 1; |
| unsigned a = n / 5 * n * 53 / 16; |
| uint64_t t = ((1ULL << (32 + a)) / |
| data::ZERO_OR_POWERS_OF_10_32[n] + 1 - n / 9); |
| t = ((t * u) >> a) + n / 5 * 4; |
| write_pair(0, t >> 32); |
| for (unsigned i = 2; i < N; i += 2) { |
| t = 100ULL * static_cast<uint32_t>(t); |
| write_pair(i, t >> 32); |
| } |
| if (N % 2 == 0) { |
| buffer_[N] = static_cast<char>( |
| (10ULL * static_cast<uint32_t>(t)) >> 32) + '0'; |
| } |
| } |
| return buffer_ += N + 1; |
| } |
| }; |
| |
| // An lg handler that formats a decimal number with a terminating null. |
| class decimal_formatter_null : public decimal_formatter { |
| public: |
| explicit decimal_formatter_null(char *buf) : decimal_formatter(buf) {} |
| |
| template <unsigned N> char *on(uint32_t u) { |
| char *buf = decimal_formatter::on<N>(u); |
| *buf = '\0'; |
| return buf; |
| } |
| }; |
| |
| #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 |
| |
| // A functor that doesn't add a thousands separator. |
| struct no_thousands_sep { |
| typedef char char_type; |
| |
| template <typename Char> |
| void operator()(Char *) {} |
| |
| enum { size = 0 }; |
| }; |
| |
| // A functor that adds a thousands separator. |
| template <typename Char> |
| class add_thousands_sep { |
| private: |
| basic_string_view<Char> sep_; |
| |
| // Index of a decimal digit with the least significant digit having index 0. |
| unsigned digit_index_; |
| |
| public: |
| typedef Char char_type; |
| |
| explicit add_thousands_sep(basic_string_view<Char> sep) |
| : sep_(sep), digit_index_(0) {} |
| |
| void operator()(Char *&buffer) { |
| if (++digit_index_ % 3 != 0) |
| return; |
| buffer -= sep_.size(); |
| std::uninitialized_copy(sep_.data(), sep_.data() + sep_.size(), |
| internal::make_checked(buffer, sep_.size())); |
| } |
| |
| enum { size = 1 }; |
| }; |
| |
| 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); |
| } |
| |
| // Formats a decimal unsigned integer value writing into buffer. |
| // thousands_sep is a functor that is called after writing each char to |
| // add a thousands separator if necessary. |
| template <typename UInt, typename Char, typename ThousandsSep> |
| inline Char *format_decimal(Char *buffer, UInt value, int num_digits, |
| ThousandsSep thousands_sep) { |
| FMT_ASSERT(num_digits >= 0, "invalid digit count"); |
| buffer += num_digits; |
| Char *end = buffer; |
| 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. |
| unsigned index = static_cast<unsigned>((value % 100) * 2); |
| value /= 100; |
| *--buffer = static_cast<Char>(data::DIGITS[index + 1]); |
| thousands_sep(buffer); |
| *--buffer = static_cast<Char>(data::DIGITS[index]); |
| thousands_sep(buffer); |
| } |
| if (value < 10) { |
| *--buffer = static_cast<Char>('0' + value); |
| return end; |
| } |
| unsigned index = static_cast<unsigned>(value * 2); |
| *--buffer = static_cast<Char>(data::DIGITS[index + 1]); |
| thousands_sep(buffer); |
| *--buffer = static_cast<Char>(data::DIGITS[index]); |
| return end; |
| } |
| |
| template <typename OutChar, typename UInt, typename Iterator, |
| typename ThousandsSep> |
| inline Iterator format_decimal( |
| Iterator out, UInt value, int num_digits, ThousandsSep sep) { |
| FMT_ASSERT(num_digits >= 0, "invalid digit count"); |
| typedef typename ThousandsSep::char_type char_type; |
| // Buffer should be large enough to hold all digits (<= digits10 + 1). |
| enum { max_size = std::numeric_limits<UInt>::digits10 + 1 }; |
| FMT_ASSERT(ThousandsSep::size <= 1, "invalid separator"); |
| char_type buffer[max_size + max_size / 3]; |
| auto end = format_decimal(buffer, value, num_digits, sep); |
| return internal::copy_str<OutChar>(buffer, end, out); |
| } |
| |
| template <typename OutChar, typename It, typename UInt> |
| inline It format_decimal(It out, UInt value, int num_digits) { |
| return format_decimal<OutChar>(out, value, num_digits, no_thousands_sep()); |
| } |
| |
| 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" : "0123456789abcdef"; |
| 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, 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) |
| // and null. |
| char buffer[std::numeric_limits<UInt>::digits / BASE_BITS + 2]; |
| format_uint<BASE_BITS>(buffer, value, num_digits, upper); |
| return internal::copy_str<Char>(buffer, buffer + num_digits, out); |
| } |
| |
| #ifndef _WIN32 |
| # define FMT_USE_WINDOWS_H 0 |
| #elif !defined(FMT_USE_WINDOWS_H) |
| # define FMT_USE_WINDOWS_H 1 |
| #endif |
| |
| // Define FMT_USE_WINDOWS_H to 0 to disable use of windows.h. |
| // All the functionality that relies on it will be disabled too. |
| #if FMT_USE_WINDOWS_H |
| // A converter from UTF-8 to UTF-16. |
| // It is only provided for Windows since other systems support UTF-8 natively. |
| class utf8_to_utf16 { |
| private: |
| wmemory_buffer buffer_; |
| |
| public: |
| FMT_API explicit utf8_to_utf16(string_view s); |
| operator wstring_view() const { return wstring_view(&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 std::wstring(&buffer_[0], size()); } |
| }; |
| |
| // A converter from UTF-16 to UTF-8. |
| // It is only provided for Windows since other systems support UTF-8 natively. |
| class utf16_to_utf8 { |
| private: |
| memory_buffer buffer_; |
| |
| public: |
| utf16_to_utf8() {} |
| FMT_API explicit utf16_to_utf8(wstring_view s); |
| operator string_view() const { return string_view(&buffer_[0], size()); } |
| size_t size() const { return buffer_.size() - 1; } |
| const char *c_str() const { return &buffer_[0]; } |
| std::string str() const { return std::string(&buffer_[0], size()); } |
| |
| // Performs conversion returning a system error code instead of |
| // throwing exception on conversion error. This method may still throw |
| // in case of memory allocation error. |
| FMT_API int convert(wstring_view s); |
| }; |
| |
| FMT_API void format_windows_error(fmt::internal::buffer &out, int error_code, |
| fmt::string_view message) FMT_NOEXCEPT; |
| #endif |
| |
| template <typename T = void> |
| struct null {}; |
| } // namespace internal |
| |
| enum alignment { |
| ALIGN_DEFAULT, ALIGN_LEFT, ALIGN_RIGHT, ALIGN_CENTER, ALIGN_NUMERIC |
| }; |
| |
| // Flags. |
| enum { SIGN_FLAG = 1, PLUS_FLAG = 2, MINUS_FLAG = 4, HASH_FLAG = 8 }; |
| |
| // An alignment specifier. |
| struct align_spec { |
| unsigned width_; |
| // Fill is always wchar_t and cast to char if necessary to avoid having |
| // two specialization of AlignSpec and its subclasses. |
| wchar_t fill_; |
| alignment align_; |
| |
| FMT_CONSTEXPR align_spec() : width_(0), fill_(' '), align_(ALIGN_DEFAULT) {} |
| FMT_CONSTEXPR unsigned width() const { return width_; } |
| FMT_CONSTEXPR wchar_t fill() const { return fill_; } |
| FMT_CONSTEXPR alignment align() const { return align_; } |
| }; |
| |
| struct core_format_specs { |
| int precision; |
| uint_least8_t flags; |
| char type; |
| |
| FMT_CONSTEXPR core_format_specs() : precision(-1), flags(0), type(0) {} |
| FMT_CONSTEXPR bool has(unsigned f) const { return (flags & f) != 0; } |
| }; |
| |
| // Format specifiers. |
| template <typename Char> |
| struct basic_format_specs : align_spec, core_format_specs { |
| FMT_CONSTEXPR basic_format_specs() {} |
| }; |
| |
| typedef basic_format_specs<char> format_specs; |
| |
| template <typename Char, typename ErrorHandler> |
| FMT_CONSTEXPR unsigned basic_parse_context<Char, ErrorHandler>::next_arg_id() { |
| if (next_arg_id_ >= 0) |
| return internal::to_unsigned(next_arg_id_++); |
| on_error("cannot switch from manual to automatic argument indexing"); |
| return 0; |
| } |
| |
| namespace internal { |
| |
| // Formats value using Grisu2 algorithm: |
| // https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf |
| template <typename Double> |
| FMT_API typename std::enable_if<sizeof(Double) == sizeof(uint64_t), bool>::type |
| grisu2_format(Double value, buffer &buf, core_format_specs); |
| template <typename Double> |
| inline typename std::enable_if<sizeof(Double) != sizeof(uint64_t), bool>::type |
| grisu2_format(Double, buffer &, core_format_specs) { return false; } |
| |
| template <typename Double> |
| void sprintf_format(Double, internal::buffer &, core_format_specs); |
| |
| 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; |
| case 'n': |
| handler.on_num(); |
| break; |
| default: |
| handler.on_error(); |
| } |
| } |
| |
| template <typename Handler> |
| FMT_CONSTEXPR void handle_float_type_spec(char spec, Handler &&handler) { |
| switch (spec) { |
| case 0: case 'g': case 'G': |
| handler.on_general(); |
| break; |
| case 'e': case 'E': |
| handler.on_exp(); |
| break; |
| case 'f': case 'F': |
| handler.on_fixed(); |
| break; |
| case 'a': case 'A': |
| handler.on_hex(); |
| break; |
| default: |
| handler.on_error(); |
| break; |
| } |
| } |
| |
| 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->flags != 0) |
| 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_error() { |
| ErrorHandler::on_error("invalid type specifier"); |
| } |
| }; |
| |
| template <typename ErrorHandler> |
| class float_type_checker : private ErrorHandler { |
| public: |
| FMT_CONSTEXPR explicit float_type_checker(ErrorHandler eh) |
| : ErrorHandler(eh) {} |
| |
| FMT_CONSTEXPR void on_general() {} |
| FMT_CONSTEXPR void on_exp() {} |
| FMT_CONSTEXPR void on_fixed() {} |
| FMT_CONSTEXPR void on_hex() {} |
| |
| 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 Context> |
| void arg_map<Context>::init(const basic_format_args<Context> &args) { |
| if (map_) |
| return; |
| map_ = new entry[args.max_size()]; |
| if (args.is_packed()) { |
| for (unsigned i = 0;/*nothing*/; ++i) { |
| internal::type arg_type = args.type(i); |
| switch (arg_type) { |
| case internal::none_type: |
| return; |
| case internal::named_arg_type: |
| push_back(args.values_[i]); |
| break; |
| default: |
| break; // Do nothing. |
| } |
| } |
| } |
| for (unsigned i = 0; ; ++i) { |
| switch (args.args_[i].type_) { |
| case internal::none_type: |
| return; |
| case internal::named_arg_type: |
| push_back(args.args_[i].value_); |
| break; |
| default: |
| break; // Do nothing. |
| } |
| } |
| } |
| |
| template <typename Range> |
| class arg_formatter_base { |
| public: |
| typedef typename Range::value_type char_type; |
| typedef decltype(internal::declval<Range>().begin()) iterator; |
| typedef basic_format_specs<char_type> format_specs; |
| |
| private: |
| typedef basic_writer<Range> writer_type; |
| writer_type writer_; |
| format_specs *specs_; |
| |
| struct char_writer { |
| char_type value; |
| |
| size_t size() const { return 1; } |
| size_t width() const { return 1; } |
| |
| template <typename It> |
| void operator()(It &&it) const { *it++ = value; } |
| }; |
| |
| void write_char(char_type value) { |
| if (specs_) |
| writer_.write_padded(*specs_, char_writer{value}); |
| else |
| writer_.write(value); |
| } |
| |
| void write_pointer(const void *p) { |
| format_specs specs = specs_ ? *specs_ : format_specs(); |
| specs.flags = HASH_FLAG; |
| specs.type = 'x'; |
| writer_.write_int(reinterpret_cast<uintptr_t>(p), specs); |
| } |
| |
| protected: |
| writer_type &writer() { return writer_; } |
| format_specs *spec() { return specs_; } |
| iterator out() { return writer_.out(); } |
| |
| void write(bool value) { |
| string_view sv(value ? "true" : "false"); |
| specs_ ? writer_.write(sv, *specs_) : writer_.write(sv); |
| } |
| |
| void write(const char_type *value) { |
| if (!value) |
| FMT_THROW(format_error("string pointer is null")); |
| auto length = std::char_traits<char_type>::length(value); |
| basic_string_view<char_type> sv(value, length); |
| specs_ ? writer_.write(sv, *specs_) : writer_.write(sv); |
| } |
| |
| public: |
| arg_formatter_base(Range r, format_specs *s, locale_ref loc) |
| : writer_(r, loc), specs_(s) {} |
| |
| iterator operator()(monostate) { |
| FMT_ASSERT(false, "invalid argument type"); |
| return out(); |
| } |
| |
| template <typename T> |
| typename std::enable_if< |
| std::is_integral<T>::value || std::is_same<T, char_type>::value, |
| iterator>::type operator()(T value) { |
| // MSVC2013 fails to compile separate overloads for bool and char_type so |
| // use std::is_same instead. |
| if (std::is_same<T, bool>::value) { |
| if (specs_ && specs_->type) |
| return (*this)(value ? 1 : 0); |
| write(value != 0); |
| } else if (std::is_same<T, char_type>::value) { |
| internal::handle_char_specs( |
| specs_, char_spec_handler(*this, static_cast<char_type>(value))); |
| } else { |
| specs_ ? writer_.write_int(value, *specs_) : writer_.write(value); |
| } |
| return out(); |
| } |
| |
| template <typename T> |
| typename std::enable_if<std::is_floating_point<T>::value, iterator>::type |
| operator()(T value) { |
| writer_.write_double(value, specs_ ? *specs_ : format_specs()); |
| return out(); |
| } |
| |
| struct char_spec_handler : internal::error_handler { |
| arg_formatter_base &formatter; |
| char_type value; |
| |
| char_spec_handler(arg_formatter_base& f, char_type val) |
| : formatter(f), value(val) {} |
| |
| void on_int() { |
| if (formatter.specs_) |
| formatter.writer_.write_int(value, *formatter.specs_); |
| else |
| formatter.writer_.write(value); |
| } |
| void on_char() { formatter.write_char(value); } |
| }; |
| |
| struct cstring_spec_handler : internal::error_handler { |
| arg_formatter_base &formatter; |
| const char_type *value; |
| |
| cstring_spec_handler(arg_formatter_base &f, const char_type *val) |
| : formatter(f), value(val) {} |
| |
| void on_string() { formatter.write(value); } |
| void on_pointer() { formatter.write_pointer(value); } |
| }; |
| |
| iterator operator()(const char_type *value) { |
| if (!specs_) return write(value), out(); |
| internal::handle_cstring_type_spec( |
| specs_->type, cstring_spec_handler(*this, value)); |
| return out(); |
| } |
| |
| iterator operator()(basic_string_view<char_type> value) { |
| if (specs_) { |
| internal::check_string_type_spec( |
| specs_->type, internal::error_handler()); |
| writer_.write(value, *specs_); |
| } else { |
| writer_.write(value); |
| } |
| return out(); |
| } |
| |
| iterator operator()(const void *value) { |
| if (specs_) |
| check_pointer_type_spec(specs_->type, internal::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 unsigned parse_nonnegative_int( |
| const Char *&begin, const Char *end, ErrorHandler &&eh) { |
| assert(begin != end && '0' <= *begin && *begin <= '9'); |
| if (*begin == '0') { |
| ++begin; |
| return 0; |
| } |
| unsigned value = 0; |
| // Convert to unsigned to prevent a warning. |
| unsigned max_int = (std::numeric_limits<int>::max)(); |
| 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 value; |
| } |
| |
| template <typename Char, typename Context> |
| class custom_formatter: public function<bool> { |
| private: |
| Context &ctx_; |
| |
| public: |
| explicit custom_formatter(Context &ctx): ctx_(ctx) {} |
| |
| bool operator()(typename basic_format_arg<Context>::handle h) const { |
| h.format(ctx_); |
| return true; |
| } |
| |
| template <typename T> |
| bool operator()(T) const { return false; } |
| }; |
| |
| template <typename T> |
| struct is_integer { |
| enum { |
| value = std::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 function<unsigned long long> { |
| public: |
| explicit FMT_CONSTEXPR width_checker(ErrorHandler &eh) : handler_(eh) {} |
| |
| template <typename T> |
| FMT_CONSTEXPR |
| typename std::enable_if< |
| is_integer<T>::value, unsigned long long>::type operator()(T value) { |
| if (is_negative(value)) |
| handler_.on_error("negative width"); |
| return static_cast<unsigned long long>(value); |
| } |
| |
| template <typename T> |
| FMT_CONSTEXPR typename std::enable_if< |
| !is_integer<T>::value, unsigned long long>::type operator()(T) { |
| handler_.on_error("width is not integer"); |
| return 0; |
| } |
| |
| private: |
| ErrorHandler &handler_; |
| }; |
| |
| template <typename ErrorHandler> |
| class precision_checker: public function<unsigned long long> { |
| public: |
| explicit FMT_CONSTEXPR precision_checker(ErrorHandler &eh) : handler_(eh) {} |
| |
| template <typename T> |
| FMT_CONSTEXPR typename std::enable_if< |
| is_integer<T>::value, unsigned long long>::type operator()(T value) { |
| if (is_negative(value)) |
| handler_.on_error("negative precision"); |
| return static_cast<unsigned long long>(value); |
| } |
| |
| template <typename T> |
| FMT_CONSTEXPR typename std::enable_if< |
| !is_integer<T>::value, unsigned long long>::type 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(alignment align) { specs_.align_ = align; } |
| FMT_CONSTEXPR void on_fill(Char fill) { specs_.fill_ = fill; } |
| FMT_CONSTEXPR void on_plus() { specs_.flags |= SIGN_FLAG | PLUS_FLAG; } |
| FMT_CONSTEXPR void on_minus() { specs_.flags |= MINUS_FLAG; } |
| FMT_CONSTEXPR void on_space() { specs_.flags |= SIGN_FLAG; } |
| FMT_CONSTEXPR void on_hash() { specs_.flags |= HASH_FLAG; } |
| |
| FMT_CONSTEXPR void on_zero() { |
| specs_.align_ = ALIGN_NUMERIC; |
| specs_.fill_ = '0'; |
| } |
| |
| FMT_CONSTEXPR void on_width(unsigned width) { specs_.width_ = width; } |
| FMT_CONSTEXPR void on_precision(unsigned precision) { |
| specs_.precision = static_cast<int>(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_; |
| }; |
| |
| // A format specifier handler that checks if specifiers are consistent with the |
| // argument type. |
| template <typename Handler> |
| class specs_checker : public Handler { |
| public: |
| FMT_CONSTEXPR specs_checker(const Handler& handler, internal::type arg_type) |
| : Handler(handler), arg_type_(arg_type) {} |
| |
| FMT_CONSTEXPR specs_checker(const specs_checker &other) |
| : Handler(other), arg_type_(other.arg_type_) {} |
| |
| FMT_CONSTEXPR void on_align(alignment align) { |
| if (align == ALIGN_NUMERIC) |
| require_numeric_argument(); |
| Handler::on_align(align); |
| } |
| |
| FMT_CONSTEXPR void on_plus() { |
| check_sign(); |
| Handler::on_plus(); |
| } |
| |
| FMT_CONSTEXPR void on_minus() { |
| check_sign(); |
| Handler::on_minus(); |
| } |
| |
| FMT_CONSTEXPR void on_space() { |
| check_sign(); |
| Handler::on_space(); |
| } |
| |
| FMT_CONSTEXPR void on_hash() { |
| require_numeric_argument(); |
| Handler::on_hash(); |
| } |
| |
| FMT_CONSTEXPR void on_zero() { |
| require_numeric_argument(); |
| Handler::on_zero(); |
| } |
| |
| FMT_CONSTEXPR void end_precision() { |
| if (is_integral(arg_type_) || arg_type_ == pointer_type) |
| this->on_error("precision not allowed for this argument type"); |
| } |
| |
| private: |
| FMT_CONSTEXPR void require_numeric_argument() { |
| if (!is_arithmetic(arg_type_)) |
| this->on_error("format specifier requires numeric argument"); |
| } |
| |
| FMT_CONSTEXPR void check_sign() { |
| require_numeric_argument(); |
| if (is_integral(arg_type_) && arg_type_ != int_type && |
| arg_type_ != long_long_type && arg_type_ != internal::char_type) { |
| this->on_error("format specifier requires signed argument"); |
| } |
| } |
| |
| internal::type arg_type_; |
| }; |
| |
| template <template <typename> class Handler, typename T, |
| typename Context, typename ErrorHandler> |
| FMT_CONSTEXPR void set_dynamic_spec( |
| T &value, basic_format_arg<Context> arg, ErrorHandler eh) { |
| unsigned long long big_value = |
| visit_format_arg(Handler<ErrorHandler>(eh), arg); |
| if (big_value > to_unsigned((std::numeric_limits<int>::max)())) |
| eh.on_error("number is too big"); |
| value = static_cast<T>(big_value); |
| } |
| |
| struct auto_id {}; |
| |
| // The standard format specifier handler with checking. |
| template <typename Context> |
| class specs_handler: public specs_setter<typename Context::char_type> { |
| public: |
| typedef typename Context::char_type char_type; |
| |
| FMT_CONSTEXPR specs_handler( |
| basic_format_specs<char_type> &specs, Context &ctx) |
| : specs_setter<char_type>(specs), context_(ctx) {} |
| |
| template <typename Id> |
| FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
| set_dynamic_spec<width_checker>( |
| this->specs_.width_, get_arg(arg_id), context_.error_handler()); |
| } |
| |
| template <typename Id> |
| FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
| set_dynamic_spec<precision_checker>( |
| this->specs_.precision, get_arg(arg_id), context_.error_handler()); |
| } |
| |
| void on_error(const char *message) { |
| context_.on_error(message); |
| } |
| |
| private: |
| FMT_CONSTEXPR basic_format_arg<Context> get_arg(auto_id) { |
| return context_.next_arg(); |
| } |
| |
| template <typename Id> |
| FMT_CONSTEXPR basic_format_arg<Context> get_arg(Id arg_id) { |
| context_.parse_context().check_arg_id(arg_id); |
| return context_.get_arg(arg_id); |
| } |
| |
| Context &context_; |
| }; |
| |
| // An argument reference. |
| template <typename Char> |
| struct arg_ref { |
| enum Kind { NONE, INDEX, NAME }; |
| |
| FMT_CONSTEXPR arg_ref() : kind(NONE), index(0) {} |
| FMT_CONSTEXPR explicit arg_ref(unsigned index) : kind(INDEX), index(index) {} |
| explicit arg_ref(basic_string_view<Char> nm) : kind(NAME) { |
| name = {nm.data(), nm.size()}; |
| } |
| |
| FMT_CONSTEXPR arg_ref &operator=(unsigned idx) { |
| kind = INDEX; |
| index = idx; |
| return *this; |
| } |
| |
| Kind kind; |
| union { |
| unsigned index; |
| string_value<Char> name; // This is not string_view because of gcc 4.4. |
| }; |
| }; |
| |
| // Format specifiers with width and precision resolved at formatting rather |
| // than parsing time to allow re-using the same parsed specifiers with |
| // differents 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: |
| typedef typename ParseContext::char_type 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: |
| typedef arg_ref<char_type> arg_ref_type; |
| |
| template <typename Id> |
| FMT_CONSTEXPR arg_ref_type make_arg_ref(Id 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()); |
| } |
| |
| 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) { |
| assert(begin != end); |
| Char c = *begin; |
| if (c == '}' || c == ':') |
| return handler(), begin; |
| if (c >= '0' && c <= '9') { |
| unsigned index = parse_nonnegative_int(begin, end, handler); |
| if (begin == end || (*begin != '}' && *begin != ':')) |
| return handler.on_error("invalid format string"), begin; |
| handler(index); |
| return begin; |
| } |
| if (!is_name_start(c)) |
| return handler.on_error("invalid format string"), 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()(unsigned 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()(unsigned 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; |
| }; |
| |
| // 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, ""); |
| alignment align = ALIGN_DEFAULT; |
| int i = 0; |
| if (begin + 1 != end) ++i; |
| do { |
| switch (static_cast<char>(begin[i])) { |
| case '<': |
| align = ALIGN_LEFT; |
| break; |
| case '>': |
| align = ALIGN_RIGHT; |
| break; |
| case '=': |
| align = ALIGN_NUMERIC; |
| break; |
| case '^': |
| align = ALIGN_CENTER; |
| break; |
| } |
| if (align != ALIGN_DEFAULT) { |
| if (i > 0) { |
| auto c = *begin; |
| if (c == '{') |
| return handler.on_error("invalid fill character '{'"), begin; |
| begin += 2; |
| handler.on_fill(c); |
| } else ++begin; |
| handler.on_align(align); |
| break; |
| } |
| } while (i-- > 0); |
| 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; |
| } |
| |
| // 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; |
| auto c = begin != end ? *begin : 0; |
| 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<SpecHandler, 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(); |
| } |
| |
| // 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, internal::to_unsigned(last - first))); |
| return out != FMT_NULL; |
| } |
| |
| template <typename Handler, typename Char> |
| struct id_adapter { |
| FMT_CONSTEXPR void operator()() { handler.on_arg_id(); } |
| FMT_CONSTEXPR void operator()(unsigned id) { handler.on_arg_id(id); } |
| FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
| handler.on_arg_id(id); |
| } |
| FMT_CONSTEXPR void on_error(const char *message) { |
| handler.on_error(message); |
| } |
| Handler &handler; |
| }; |
| |
| template <bool IS_CONSTEXPR, typename Char, typename Handler> |
| FMT_CONSTEXPR void parse_format_string( |
| basic_string_view<Char> format_str, Handler &&handler) { |
| struct writer { |
| FMT_CONSTEXPR void operator()(const Char *begin, const Char *end) { |
| if (begin == end) return; |
| for (;;) { |
| const Char *p = FMT_NULL; |
| 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}; |
| auto begin = format_str.data(); |
| auto end = begin + format_str.size(); |
| 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, end, '{', p)) |
| return write(begin, end); |
| write(begin, p); |
| ++p; |
| if (p == end) |
| return handler.on_error("invalid format string"); |
| if (static_cast<char>(*p) == '}') { |
| handler.on_arg_id(); |
| handler.on_replacement_field(p); |
| } else if (*p == '{') { |
| handler.on_text(p, p + 1); |
| } else { |
| p = parse_arg_id(p, end, id_adapter<Handler, Char>{handler}); |
| Char c = p != end ? *p : Char(); |
| if (c == '}') { |
| handler.on_replacement_field(p); |
| } else if (c == ':') { |
| p = handler.on_format_specs(p + 1, end); |
| if (p == end || *p != '}') |
| return handler.on_error("unknown format specifier"); |
| } else { |
| return handler.on_error("missing '}' in format string"); |
| } |
| } |
| begin = p + 1; |
| } |
| } |
| |
| template <typename T, typename ParseContext> |
| FMT_CONSTEXPR const typename ParseContext::char_type * |
| parse_format_specs(ParseContext &ctx) { |
| // GCC 7.2 requires initializer. |
| formatter<T, typename ParseContext::char_type> f{}; |
| return f.parse(ctx); |
| } |
| |
| 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) |
| : arg_id_((std::numeric_limits<unsigned>::max)()), context_(format_str, eh), |
| parse_funcs_{&parse_format_specs<Args, parse_context_type>...} {} |
| |
| FMT_CONSTEXPR void on_text(const Char *, const Char *) {} |
| |
| FMT_CONSTEXPR void on_arg_id() { |
| arg_id_ = context_.next_arg_id(); |
| check_arg_id(); |
| } |
| FMT_CONSTEXPR void on_arg_id(unsigned id) { |
| arg_id_ = id; |
| context_.check_arg_id(id); |
| check_arg_id(); |
| } |
| FMT_CONSTEXPR void on_arg_id(basic_string_view<Char>) {} |
| |
| FMT_CONSTEXPR void on_replacement_field(const Char *) {} |
| |
| FMT_CONSTEXPR const Char *on_format_specs(const Char *begin, const Char *) { |
| context_.advance_to(begin); |
| return arg_id_ < NUM_ARGS ? |
| parse_funcs_[arg_id_](context_) : begin; |
| } |
| |
| FMT_CONSTEXPR void on_error(const char *message) { |
| context_.on_error(message); |
| } |
| |
| private: |
| typedef basic_parse_context<Char, ErrorHandler> parse_context_type; |
| enum { NUM_ARGS = sizeof...(Args) }; |
| |
| FMT_CONSTEXPR void check_arg_id() { |
| if (arg_id_ >= NUM_ARGS) |
| context_.on_error("argument index out of range"); |
| } |
| |
| // Format specifier parsing function. |
| typedef const Char *(*parse_func)(parse_context_type &); |
| |
| unsigned arg_id_; |
| parse_context_type context_; |
| parse_func parse_funcs_[NUM_ARGS > 0 ? NUM_ARGS : 1]; |
| }; |
| |
| template <typename Char, typename ErrorHandler, typename... Args> |
| FMT_CONSTEXPR bool do_check_format_string( |
| basic_string_view<Char> s, ErrorHandler eh = ErrorHandler()) { |
| format_string_checker<Char, ErrorHandler, Args...> checker(s, eh); |
| parse_format_string<true>(s, checker); |
| return true; |
| } |
| |
| template <typename... Args, typename S> |
| typename std::enable_if<is_compile_string<S>::value>::type |
| check_format_string(S format_str) { |
| typedef typename S::char_type char_t; |
| FMT_CONSTEXPR_DECL bool invalid_format = internal::do_check_format_string< |
| char_t, internal::error_handler, Args...>(to_string_view(format_str)); |
| (void)invalid_format; |
| } |
| |
| // Specifies whether to format T using the standard formatter. |
| // It is not possible to use get_type in formatter specialization directly |
| // because of a bug in MSVC. |
| template <typename Context, typename T> |
| struct format_type : |
| std::integral_constant<bool, get_type<Context, T>::value != custom_type> {}; |
| |
| template <template <typename> class Handler, typename Spec, typename Context> |
| void handle_dynamic_spec( |
| Spec &value, arg_ref<typename Context::char_type> ref, Context &ctx) { |
| typedef typename Context::char_type char_type; |
| switch (ref.kind) { |
| case arg_ref<char_type>::NONE: |
| break; |
| case arg_ref<char_type>::INDEX: |
| internal::set_dynamic_spec<Handler>( |
| value, ctx.get_arg(ref.index), ctx.error_handler()); |
| break; |
| case arg_ref<char_type>::NAME: |
| internal::set_dynamic_spec<Handler>( |
| value, ctx.get_arg({ref.name.value, ref.name.size}), |
| ctx.error_handler()); |
| break; |
| } |
| } |
| } // namespace internal |
| |
| /** The default argument formatter. */ |
| template <typename Range> |
| class arg_formatter: |
| public internal::function< |
| typename internal::arg_formatter_base<Range>::iterator>, |
| public internal::arg_formatter_base<Range> { |
| private: |
| typedef typename Range::value_type char_type; |
| typedef internal::arg_formatter_base<Range> base; |
| typedef basic_format_context<typename base::iterator, char_type> context_type; |
| |
| context_type &ctx_; |
| |
| public: |
| typedef Range range; |
| typedef typename base::iterator iterator; |
| typedef typename base::format_specs format_specs; |
| |
| /** |
| \rst |
| Constructs an argument formatter object. |
| *ctx* is a reference to the formatting context, |
| *spec* contains format specifier information for standard argument types. |
| \endrst |
| */ |
| explicit arg_formatter(context_type &ctx, format_specs *spec = FMT_NULL) |
| : base(Range(ctx.out()), spec, ctx.locale()), ctx_(ctx) {} |
| |
| // Deprecated. |
| arg_formatter(context_type &ctx, format_specs &spec) |
| : base(Range(ctx.out()), &spec), ctx_(ctx) {} |
| |
| using base::operator(); |
| |
| /** Formats an argument of a user-defined type. */ |
| iterator operator()(typename basic_format_arg<context_type>::handle handle) { |
| handle.format(ctx_); |
| return this->out(); |
| } |
| }; |
| |
| /** |
| An error returned by an operating system or a language runtime, |
| for example a file opening error. |
| */ |
| class system_error : public std::runtime_error { |
| private: |
| FMT_API void init(int err_code, string_view format_str, format_args args); |
| |
| protected: |
| int error_code_; |
| |
| system_error() : std::runtime_error("") {} |
| |
| 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...)); |
| } |
| |
| 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(internal::buffer &out, int error_code, |
| fmt::string_view message) FMT_NOEXCEPT; |
| |
| /** |
| This template provides operations for formatting and writing data into a |
| character range. |
| */ |
| template <typename Range> |
| class basic_writer { |
| public: |
| typedef typename Range::value_type char_type; |
| typedef decltype(internal::declval<Range>().begin()) iterator; |
| typedef basic_format_specs<char_type> format_specs; |
| |
| private: |
| iterator out_; // Output iterator. |
| internal::locale_ref locale_; |
| |
| // 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(std::size_t n) -> decltype(internal::reserve(out_, n)) { |
| return internal::reserve(out_, n); |
| } |
| |
| // Writes a value in the format |
| // <left-padding><value><right-padding> |
| // where <value> is written by f(it). |
| template <typename F> |
| void write_padded(const align_spec &spec, F &&f) { |
| unsigned width = spec.width(); // User-perceived width (in code points). |
| size_t size = f.size(); // The number of code units. |
| size_t num_code_points = width != 0 ? f.width() : size; |
| if (width <= num_code_points) |
| return f(reserve(size)); |
| auto &&it = reserve(width + (size - num_code_points)); |
| char_type fill = static_cast<char_type>(spec.fill()); |
| std::size_t padding = width - num_code_points; |
| if (spec.align() == ALIGN_RIGHT) { |
| it = std::fill_n(it, padding, fill); |
| f(it); |
| } else if (spec.align() == ALIGN_CENTER) { |
| std::size_t left_padding = padding / 2; |
| it = std::fill_n(it, left_padding, fill); |
| f(it); |
| it = std::fill_n(it, padding - left_padding, fill); |
| } else { |
| f(it); |
| it = std::fill_n(it, padding, fill); |
| } |
| } |
| |
| template <typename F> |
| struct padded_int_writer { |
| size_t size_; |
| string_view prefix; |
| char_type fill; |
| std::size_t padding; |
| F f; |
| |
| size_t size() const { return size_; } |
| size_t width() const { return size_; } |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| if (prefix.size() != 0) |
| it = internal::copy_str<char_type>(prefix.begin(), prefix.end(), it); |
| it = std::fill_n(it, padding, fill); |
| f(it); |
| } |
| }; |
| |
| // Writes an integer in the format |
| // <left-padding><prefix><numeric-padding><digits><right-padding> |
| // where <digits> are written by f(it). |
| template <typename Spec, typename F> |
| void write_int(int num_digits, string_view prefix, |
| const Spec &spec, F f) { |
| std::size_t size = prefix.size() + internal::to_unsigned(num_digits); |
| char_type fill = static_cast<char_type>(spec.fill()); |
| std::size_t padding = 0; |
| if (spec.align() == ALIGN_NUMERIC) { |
| if (spec.width() > size) { |
| padding = spec.width() - size; |
| size = spec.width(); |
| } |
| } else if (spec.precision > num_digits) { |
| size = prefix.size() + internal::to_unsigned(spec.precision); |
| padding = internal::to_unsigned(spec.precision - num_digits); |
| fill = static_cast<char_type>('0'); |
| } |
| align_spec as = spec; |
| if (spec.align() == ALIGN_DEFAULT) |
| as.align_ = ALIGN_RIGHT; |
| write_padded(as, padded_int_writer<F>{size, prefix, fill, padding, f}); |
| } |
| |
| // Writes a decimal integer. |
| template <typename Int> |
| void write_decimal(Int value) { |
| typedef typename internal::int_traits<Int>::main_type main_type; |
| main_type abs_value = static_cast<main_type>(value); |
| bool is_negative = internal::is_negative(value); |
| if (is_negative) |
| abs_value = 0 - abs_value; |
| int num_digits = internal::count_digits(abs_value); |
| auto &&it = reserve((is_negative ? 1 : 0) + static_cast<size_t>(num_digits)); |
| if (is_negative) |
| *it++ = static_cast<char_type>('-'); |
| it = internal::format_decimal<char_type>(it, abs_value, num_digits); |
| } |
| |
| // The handle_int_type_spec handler that writes an integer. |
| template <typename Int, typename Spec> |
| struct int_writer { |
| typedef typename internal::int_traits<Int>::main_type unsigned_type; |
| |
| basic_writer<Range> &writer; |
| const Spec &spec; |
| unsigned_type abs_value; |
| char prefix[4]; |
| unsigned prefix_size; |
| |
| string_view get_prefix() const { return string_view(prefix, prefix_size); } |
| |
| // Counts the number of digits in abs_value. BITS = log2(radix). |
| template <unsigned BITS> |
| int count_digits() const { |
| unsigned_type n = abs_value; |
| int num_digits = 0; |
| do { |
| ++num_digits; |
| } while ((n >>= BITS) != 0); |
| return num_digits; |
| } |
| |
| int_writer(basic_writer<Range> &w, Int value, const Spec &s) |
| : writer(w), spec(s), abs_value(static_cast<unsigned_type>(value)), |
| prefix_size(0) { |
| if (internal::is_negative(value)) { |
| prefix[0] = '-'; |
| ++prefix_size; |
| abs_value = 0 - abs_value; |
| } else if (spec.has(SIGN_FLAG)) { |
| prefix[0] = spec.has(PLUS_FLAG) ? '+' : ' '; |
| ++prefix_size; |
| } |
| } |
| |
| struct dec_writer { |
| unsigned_type abs_value; |
| int num_digits; |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| it = internal::format_decimal<char_type>(it, abs_value, num_digits); |
| } |
| }; |
| |
| void on_dec() { |
| int num_digits = internal::count_digits(abs_value); |
| writer.write_int(num_digits, get_prefix(), spec, |
| dec_writer{abs_value, num_digits}); |
| } |
| |
| struct hex_writer { |
| int_writer &self; |
| int num_digits; |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| it = internal::format_uint<4, char_type>( |
| it, self.abs_value, num_digits, self.spec.type != 'x'); |
| } |
| }; |
| |
| void on_hex() { |
| if (spec.has(HASH_FLAG)) { |
| prefix[prefix_size++] = '0'; |
| prefix[prefix_size++] = static_cast<char>(spec.type); |
| } |
| int num_digits = count_digits<4>(); |
| writer.write_int(num_digits, get_prefix(), spec, |
| hex_writer{*this, num_digits}); |
| } |
| |
| template <int BITS> |
| struct bin_writer { |
| unsigned_type abs_value; |
| int num_digits; |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| it = internal::format_uint<BITS, char_type>(it, abs_value, num_digits); |
| } |
| }; |
| |
| void on_bin() { |
| if (spec.has(HASH_FLAG)) { |
| prefix[prefix_size++] = '0'; |
| prefix[prefix_size++] = static_cast<char>(spec.type); |
| } |
| int num_digits = count_digits<1>(); |
| writer.write_int(num_digits, get_prefix(), spec, |
| bin_writer<1>{abs_value, num_digits}); |
| } |
| |
| void on_oct() { |
| int num_digits = count_digits<3>(); |
| if (spec.has(HASH_FLAG) && |
| spec.precision <= num_digits) { |
| // 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'; |
| } |
| writer.write_int(num_digits, get_prefix(), spec, |
| bin_writer<3>{abs_value, num_digits}); |
| } |
| |
| enum { SEP_SIZE = 1 }; |
| |
| struct num_writer { |
| unsigned_type abs_value; |
| int size; |
| char_type sep; |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| basic_string_view<char_type> s(&sep, SEP_SIZE); |
| it = internal::format_decimal<char_type>( |
| it, abs_value, size, internal::add_thousands_sep<char_type>(s)); |
| } |
| }; |
| |
| void on_num() { |
| int num_digits = internal::count_digits(abs_value); |
| char_type sep = internal::thousands_sep<char_type>(writer.locale_); |
| int size = num_digits + SEP_SIZE * ((num_digits - 1) / 3); |
| writer.write_int(size, get_prefix(), spec, |
| num_writer{abs_value, size, sep}); |
| } |
| |
| void on_error() { |
| FMT_THROW(format_error("invalid type specifier")); |
| } |
| }; |
| |
| // Writes a formatted integer. |
| template <typename T, typename Spec> |
| void write_int(T value, const Spec &spec) { |
| internal::handle_int_type_spec(spec.type, |
| int_writer<T, Spec>(*this, value, spec)); |
| } |
| |
| enum {INF_SIZE = 3}; // This is an enum to workaround a bug in MSVC. |
| |
| struct inf_or_nan_writer { |
| char sign; |
| const char *str; |
| |
| size_t size() const { |
| return static_cast<std::size_t>(INF_SIZE + (sign ? 1 : 0)); |
| } |
| size_t width() const { return size(); } |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| if (sign) |
| *it++ = static_cast<char_type>(sign); |
| it = internal::copy_str<char_type>( |
| str, str + static_cast<std::size_t>(INF_SIZE), it); |
| } |
| }; |
| |
| struct double_writer { |
| size_t n; |
| char sign; |
| internal::buffer &buffer; |
| |
| size_t size() const { return buffer.size() + (sign ? 1 : 0); } |
| size_t width() const { return size(); } |
| |
| template <typename It> |
| void operator()(It &&it) { |
| if (sign) { |
| *it++ = static_cast<char_type>(sign); |
| --n; |
| } |
| it = internal::copy_str<char_type>(buffer.begin(), buffer.end(), it); |
| } |
| }; |
| |
| // Formats a floating-point number (double or long double). |
| template <typename T> |
| void write_double(T value, const format_specs &spec); |
| |
| template <typename Char> |
| struct str_writer { |
| const Char *s; |
| size_t size_; |
| |
| size_t size() const { return size_; } |
| size_t width() const { |
| return internal::count_code_points(basic_string_view<Char>(s, size_)); |
| } |
| |
| template <typename It> |
| void operator()(It &&it) const { |
| it = internal::copy_str<char_type>(s, s + size_, it); |
| } |
| }; |
| |
| template <typename Char> |
| friend class internal::arg_formatter_base; |
| |
| public: |
| /** Constructs a ``basic_writer`` object. */ |
| explicit basic_writer( |
| Range out, internal::locale_ref loc = internal::locale_ref()) |
| : out_(out.begin()), locale_(loc) {} |
| |
| iterator out() const { return out_; } |
| |
| void write(int value) { write_decimal(value); } |
| void write(long value) { write_decimal(value); } |
| void write(long long value) { write_decimal(value); } |
| |
| void write(unsigned value) { write_decimal(value); } |
| void write(unsigned long value) { write_decimal(value); } |
| void write(unsigned long long value) { write_decimal(value); } |
| |
| /** |
| \rst |
| Formats *value* and writes it to the buffer. |
| \endrst |
| */ |
| template <typename T, typename FormatSpec, typename... FormatSpecs> |
| typename std::enable_if<std::is_integral<T>::value, void>::type |
| write(T value, FormatSpec spec, FormatSpecs... specs) { |
| format_specs s(spec, specs...); |
| s.align_ = ALIGN_RIGHT; |
| write_int(value, s); |
| } |
| |
| void write(double value) { |
| write_double(value, format_specs()); |
| } |
| |
| /** |
| \rst |
| Formats *value* using the general format for floating-point numbers |
| (``'g'``) and writes it to the buffer. |
| \endrst |
| */ |
| void write(long double value) { |
| write_double(value, format_specs()); |
| } |
| |
| /** Writes a character to the buffer. */ |
| void write(char value) { |
| *reserve(1) = value; |
| } |
| void write(wchar_t value) { |
| static_assert(std::is_same<char_type, wchar_t>::value, ""); |
| *reserve(1) = value; |
| } |
| |
| /** |
| \rst |
| Writes *value* to the buffer. |
| \endrst |
| */ |
| void write(string_view value) { |
| auto &&it = reserve(value.size()); |
| it = internal::copy_str<char_type>(value.begin(), value.end(), it); |
| } |
| void write(wstring_view value) { |
| static_assert(std::is_same<char_type, wchar_t>::value, ""); |
| auto &&it = reserve(value.size()); |
| it = std::copy(value.begin(), value.end(), it); |
| } |
| |
| // Writes a formatted string. |
| template <typename Char> |
| void write(const Char *s, std::size_t size, const align_spec &spec) { |
| write_padded(spec, str_writer<Char>{s, size}); |
| } |
| |
| template <typename Char> |
| void write(basic_string_view<Char> s, |
| const format_specs &spec = format_specs()) { |
| const Char *data = s.data(); |
| std::size_t size = s.size(); |
| if (spec.precision >= 0 && internal::to_unsigned(spec.precision) < size) |
| size = internal::to_unsigned(spec.precision); |
| write(data, size, spec); |
| } |
| |
| template <typename T> |
| typename std::enable_if<std::is_same<T, void>::value>::type |
| write(const T *p) { |
| format_specs specs; |
| specs.flags = HASH_FLAG; |
| specs.type = 'x'; |
| write_int(reinterpret_cast<uintptr_t>(p), specs); |
| } |
| }; |
| |
| struct float_spec_handler { |
| char type; |
| bool upper; |
| |
| explicit float_spec_handler(char t) : type(t), upper(false) {} |
| |
| void on_general() { |
| if (type == 'G') |
| upper = true; |
| else |
| type = 'g'; |
| } |
| |
| void on_exp() { |
| if (type == 'E') |
| upper = true; |
| } |
| |
| void on_fixed() { |
| if (type == 'F') { |
| upper = true; |
| #if FMT_MSC_VER |
| // MSVC's printf doesn't support 'F'. |
| type = 'f'; |
| #endif |
| } |
| } |
| |
| void on_hex() { |
| if (type == 'A') |
| upper = true; |
| } |
| |
| void on_error() { |
| FMT_THROW(format_error("invalid type specifier")); |
| } |
| }; |
| |
| template <typename Range> |
| template <typename T> |
| void basic_writer<Range>::write_double(T value, const format_specs &spec) { |
| // Check type. |
| float_spec_handler handler(static_cast<char>(spec.type)); |
| internal::handle_float_type_spec(handler.type, handler); |
| |
| char sign = 0; |
| // Use signbit instead of value < 0 because the latter is always |
| // false for NaN. |
| if (std::signbit(value)) { |
| sign = '-'; |
| value = -value; |
| } else if (spec.has(SIGN_FLAG)) { |
| sign = spec.has(PLUS_FLAG) ? '+' : ' '; |
| } |
| |
| struct write_inf_or_nan_t { |
| basic_writer &writer; |
| format_specs spec; |
| char sign; |
| void operator()(const char *str) const { |
| writer.write_padded(spec, inf_or_nan_writer{sign, str}); |
| } |
| } write_inf_or_nan = {*this, spec, sign}; |
| |
| // Format NaN and ininity ourselves because sprintf's output is not consistent |
| // across platforms. |
| if (internal::fputil::isnotanumber(value)) |
| return write_inf_or_nan(handler.upper ? "NAN" : "nan"); |
| if (internal::fputil::isinfinity(value)) |
| return write_inf_or_nan(handler.upper ? "INF" : "inf"); |
| |
| memory_buffer buffer; |
| bool use_grisu = FMT_USE_GRISU && sizeof(T) <= sizeof(double) && |
| spec.type != 'a' && spec.type != 'A' && |
| internal::grisu2_format(static_cast<double>(value), buffer, spec); |
| if (!use_grisu) { |
| format_specs normalized_spec(spec); |
| normalized_spec.type = handler.type; |
| internal::sprintf_format(value, buffer, normalized_spec); |
| } |
| size_t n = buffer.size(); |
| align_spec as = spec; |
| if (spec.align() == ALIGN_NUMERIC) { |
| if (sign) { |
| auto &&it = reserve(1); |
| *it++ = static_cast<char_type>(sign); |
| sign = 0; |
| if (as.width_) |
| --as.width_; |
| } |
| as.align_ = ALIGN_RIGHT; |
| } else { |
| if (spec.align() == ALIGN_DEFAULT) |
| as.align_ = ALIGN_RIGHT; |
| if (sign) |
| ++n; |
| } |
| write_padded(as, double_writer{n, sign, buffer}); |
| } |
| |
| // 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; |
| |
| #if FMT_USE_WINDOWS_H |
| |
| /** A Windows error. */ |
| class windows_error : public system_error { |
| private: |
| FMT_API void init(int error_code, string_view format_str, format_args args); |
| |
| public: |
| /** |
| \rst |
| Constructs a :class:`fmt::windows_error` object with the description |
| of the form |
| |
| .. parsed-literal:: |
| *<message>*: *<system-message>* |
| |
| where *<message>* is the formatted message and *<system-message>* is the |
| system message corresponding to the error code. |
| *error_code* is a Windows error code as given by ``GetLastError``. |
| If *error_code* is not a valid error code such as -1, the system message |
| will look like "error -1". |
| |
| **Example**:: |
| |
| // This throws a windows_error with the description |
| // cannot open file 'madeup': The system cannot find the file specified. |
| // or similar (system message may vary). |
| const char *filename = "madeup"; |
| LPOFSTRUCT of = LPOFSTRUCT(); |
| HFILE file = OpenFile(filename, &of, OF_READ); |
| if (file == HFILE_ERROR) { |
| throw fmt::windows_error(GetLastError(), |
| "cannot open file '{}'", filename); |
| } |
| \endrst |
| */ |
| template <typename... Args> |
| windows_error(int error_code, string_view message, const Args &... args) { |
| init(error_code, message, make_format_args(args...)); |
| } |
| }; |
| |
| // Reports a Windows error without throwing an exception. |
| // Can be used to report errors from destructors. |
| FMT_API void report_windows_error(int error_code, |
| string_view message) FMT_NOEXCEPT; |
| |
| #endif |
| |
| /** 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_; |
| |
| // Formats value in reverse and returns a pointer to the beginning. |
| char *format_decimal(unsigned long long value) { |
| char *ptr = buffer_ + (BUFFER_SIZE - 1); // Parens to workaround MSVC bug. |
| 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. |
| unsigned index = static_cast<unsigned>((value % 100) * 2); |
| value /= 100; |
| *--ptr = internal::data::DIGITS[index + 1]; |
| *--ptr = internal::data::DIGITS[index]; |
| } |
| if (value < 10) { |
| *--ptr = static_cast<char>('0' + value); |
| return ptr; |
| } |
| unsigned index = static_cast<unsigned>(value * 2); |
| *--ptr = internal::data::DIGITS[index + 1]; |
| *--ptr = internal::data::DIGITS[index]; |
| return ptr; |
| } |
| |
| void format_signed(long long value) { |
| unsigned long long abs_value = static_cast<unsigned long long>(value); |
| bool negative = value < 0; |
| if (negative) |
| abs_value = 0 - abs_value; |
| str_ = format_decimal(abs_value); |
| if (negative) |
| *--str_ = '-'; |
| } |
| |
| public: |
| explicit format_int(int value) { format_signed(value); } |
| explicit format_int(long value) { format_signed(value); } |
| explicit format_int(long long value) { format_signed(value); } |
| explicit format_int(unsigned value) : str_(format_decimal(value)) {} |
| explicit format_int(unsigned long value) : str_(format_decimal(value)) {} |
| explicit format_int(unsigned long long value) : str_(format_decimal(value)) {} |
| |
| /** Returns the number of characters written to the output buffer. */ |
| std::size_t size() const { |
| return internal::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()); } |
| }; |
| |
| // DEPRECATED! |
| // Formats a decimal integer value writing into buffer and returns |
| // a pointer to the end of the formatted string. This function doesn't |
| // write a terminating null character. |
| template <typename T> |
| inline void format_decimal(char *&buffer, T value) { |
| typedef typename internal::int_traits<T>::main_type main_type; |
| main_type abs_value = static_cast<main_type>(value); |
| if (internal::is_negative(value)) { |
| *buffer++ = '-'; |
| abs_value = 0 - abs_value; |
| } |
| if (abs_value < 100) { |
| if (abs_value < 10) { |
| *buffer++ = static_cast<char>('0' + abs_value); |
| return; |
| } |
| unsigned index = static_cast<unsigned>(abs_value * 2); |
| *buffer++ = internal::data::DIGITS[index]; |
| *buffer++ = internal::data::DIGITS[index + 1]; |
| return; |
| } |
| int num_digits = internal::count_digits(abs_value); |
| internal::format_decimal<char>( |
| internal::make_checked(buffer, internal::to_unsigned(num_digits)), abs_value, num_digits); |
| buffer += num_digits; |
| } |
| |
| // Formatter of objects of type T. |
| template <typename T, typename Char> |
| struct formatter< |
| T, Char, |
| typename std::enable_if<internal::format_type< |
| typename buffer_context<Char>::type, T>::value>::type> { |
| |
| // Parses format specifiers stopping either at the end of the range or at the |
| // terminating '}'. |
| template <typename ParseContext> |
| FMT_CONSTEXPR typename ParseContext::iterator parse(ParseContext &ctx) { |
| typedef internal::dynamic_specs_handler<ParseContext> handler_type; |
| auto type = internal::get_type< |
| typename buffer_context<Char>::type, T>::value; |
| internal::specs_checker<handler_type> |
| handler(handler_type(specs_, ctx), type); |
| auto it = parse_format_specs(ctx.begin(), ctx.end(), handler); |
| auto type_spec = specs_.type; |
| auto eh = ctx.error_handler(); |
| switch (type) { |
| case internal::none_type: |
| case internal::named_arg_type: |
| FMT_ASSERT(false, "invalid argument type"); |
| break; |
| case internal::int_type: |
| case internal::uint_type: |
| case internal::long_long_type: |
| case internal::ulong_long_type: |
| case internal::bool_type: |
| handle_int_type_spec( |
| type_spec, internal::int_type_checker<decltype(eh)>(eh)); |
| break; |
| case internal::char_type: |
| handle_char_specs( |
| &specs_, |
| internal::char_specs_checker<decltype(eh)>(type_spec, eh)); |
| break; |
| case internal::double_type: |
| case internal::long_double_type: |
| handle_float_type_spec( |
| type_spec, internal::float_type_checker<decltype(eh)>(eh)); |
| break; |
| case internal::cstring_type: |
| internal::handle_cstring_type_spec( |
| type_spec, internal::cstring_type_checker<decltype(eh)>(eh)); |
| break; |
| case internal::string_type: |
| internal::check_string_type_spec(type_spec, eh); |
| break; |
| case internal::pointer_type: |
| internal::check_pointer_type_spec(type_spec, eh); |
| break; |
| case internal::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()) { |
| internal::handle_dynamic_spec<internal::width_checker>( |
| specs_.width_, specs_.width_ref, ctx); |
| internal::handle_dynamic_spec<internal::precision_checker>( |
| specs_.precision, specs_.precision_ref, ctx); |
| typedef output_range<typename FormatContext::iterator, |
| typename FormatContext::char_type> range_type; |
| return visit_format_arg(arg_formatter<range_type>(ctx, &specs_), |
| internal::make_arg<FormatContext>(val)); |
| } |
| |
| private: |
| internal::dynamic_format_specs<Char> specs_; |
| }; |
| |
| // A formatter for types known only at run time such as variant alternatives. |
| // |
| // Usage: |
| // typedef std::variant<int, std::string> variant; |
| // 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: internal::error_handler { |
| void on_align(alignment) {} |
| void on_plus() {} |
| void on_minus() {} |
| void on_space() {} |
| void on_hash() {} |
| }; |
| |
| public: |
| template <typename ParseContext> |
| auto parse(ParseContext &ctx) -> decltype(ctx.begin()) { |
| // Checks are deferred to formatting time when the argument type is known. |
| internal::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); |
| internal::specs_checker<null_handler> |
| checker(null_handler(), internal::get_type<FormatContext, T>::value); |
| checker.on_align(specs_.align()); |
| if (specs_.flags == 0); // Do nothing. |
| else if (specs_.has(SIGN_FLAG)) |
| specs_.has(PLUS_FLAG) ? checker.on_plus() : checker.on_space(); |
| else if (specs_.has(MINUS_FLAG)) |
| checker.on_minus(); |
| else if (specs_.has(HASH_FLAG)) |
| checker.on_hash(); |
| if (specs_.precision != -1) |
| checker.end_precision(); |
| typedef output_range<typename FormatContext::iterator, |
| typename FormatContext::char_type> range; |
| visit_format_arg(arg_formatter<range>(ctx, &specs_), |
| internal::make_arg<FormatContext>(val)); |
| return ctx.out(); |
| } |
| |
| private: |
| template <typename Context> |
| void handle_specs(Context &ctx) { |
| internal::handle_dynamic_spec<internal::width_checker>( |
| specs_.width_, specs_.width_ref, ctx); |
| internal::handle_dynamic_spec<internal::precision_checker>( |
| specs_.precision, specs_.precision_ref, ctx); |
| } |
| |
| internal::dynamic_format_specs<Char> specs_; |
| }; |
| |
| template <typename Range, typename Char> |
| typename basic_format_context<Range, Char>::format_arg |
| basic_format_context<Range, Char>::get_arg( |
| basic_string_view<char_type> name) { |
| map_.init(this->args()); |
| format_arg arg = map_.find(name); |
| if (arg.type() == internal::none_type) |
| this->on_error("argument not found"); |
| return arg; |
| } |
| |
| template <typename ArgFormatter, typename Char, typename Context> |
| struct format_handler : internal::error_handler { |
| typedef typename ArgFormatter::range range; |
| |
| format_handler(range r, basic_string_view<Char> str, |
| basic_format_args<Context> format_args, |
| internal::locale_ref loc) |
| : context(r.begin(), str, format_args, loc) {} |
| |
| void on_text(const Char *begin, const Char *end) { |
| auto size = internal::to_unsigned(end - begin); |
| auto out = context.out(); |
| auto &&it = internal::reserve(out, size); |
| it = std::copy_n(begin, size, it); |
| context.advance_to(out); |
| } |
| |
| void on_arg_id() { arg = context.next_arg(); } |
| void on_arg_id(unsigned id) { |
| context.parse_context().check_arg_id(id); |
| arg = context.get_arg(id); |
| } |
| void on_arg_id(basic_string_view<Char> id) { |
| arg = context.get_arg(id); |
| } |
| |
| void on_replacement_field(const Char *p) { |
| context.parse_context().advance_to(p); |
| internal::custom_formatter<Char, Context> f(context); |
| if (!visit_format_arg(f, arg)) |
| context.advance_to(visit_format_arg(ArgFormatter(context), arg)); |
| } |
| |
| const Char *on_format_specs(const Char *begin, const Char *end) { |
| auto &parse_ctx = context.parse_context(); |
| parse_ctx.advance_to(begin); |
| internal::custom_formatter<Char, Context> f(context); |
| if (visit_format_arg(f, arg)) |
| return parse_ctx.begin(); |
| basic_format_specs<Char> specs; |
| using internal::specs_handler; |
| internal::specs_checker<specs_handler<Context>> |
| handler(specs_handler<Context>(specs, context), arg.type()); |
| begin = parse_format_specs(begin, end, handler); |
| if (begin == end || *begin != '}') |
| on_error("missing '}' in format string"); |
| parse_ctx.advance_to(begin); |
| context.advance_to(visit_format_arg(ArgFormatter(context, &specs), arg)); |
| return begin; |
| } |
| |
| Context context; |
| basic_format_arg<Context> arg; |
| }; |
| |
| /** Formats arguments and writes the output to the range. */ |
| template <typename ArgFormatter, typename Char, typename Context> |
| typename Context::iterator vformat_to( |
| typename ArgFormatter::range out, |
| basic_string_view<Char> format_str, |
| basic_format_args<Context> args, |
| internal::locale_ref loc = internal::locale_ref()) { |
| format_handler<ArgFormatter, Char, Context> h(out, format_str, args, loc); |
| internal::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 It, typename Char> |
| struct arg_join { |
| It begin; |
| It end; |
| basic_string_view<Char> sep; |
| |
| arg_join(It begin, It end, basic_string_view<Char> sep) |
| : begin(begin), end(end), sep(sep) {} |
| }; |
| |
| template <typename It, typename Char> |
| struct formatter<arg_join<It, Char>, Char>: |
| formatter<typename std::iterator_traits<It>::value_type, Char> { |
| template <typename FormatContext> |
| auto format(const arg_join<It, Char> &value, FormatContext &ctx) |
| -> decltype(ctx.out()) { |
| typedef formatter<typename std::iterator_traits<It>::value_type, Char> base; |
| 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; |
| } |
| }; |
| |
| template <typename It> |
| arg_join<It, char> join(It begin, It end, string_view sep) { |
| return arg_join<It, char>(begin, end, sep); |
| } |
| |
| template <typename It> |
| arg_join<It, wchar_t> join(It begin, It end, wstring_view sep) { |
| return arg_join<It, wchar_t>(begin, end, sep); |
| } |
| |
| // The following causes ICE in gcc 4.4. |
| #if FMT_USE_TRAILING_RETURN && (!FMT_GCC_VERSION || FMT_GCC_VERSION >= 405) |
| template <typename Range> |
| auto join(const Range &range, string_view sep) |
| -> arg_join<decltype(internal::begin(range)), char> { |
| return join(internal::begin(range), internal::end(range), sep); |
| } |
| |
| template <typename Range> |
| auto join(const Range &range, wstring_view sep) |
| -> arg_join<decltype(internal::begin(range)), wchar_t> { |
| return join(internal::begin(range), internal::end(range), sep); |
| } |
| #endif |
| |
| /** |
| \rst |
| Converts *value* to ``std::string`` using the default format for type *T*. |
| It doesn't support user-defined types with custom formatters. |
| |
| **Example**:: |
| |
| #include <fmt/format.h> |
| |
| std::string answer = fmt::to_string(42); |
| \endrst |
| */ |
| template <typename T> |
| std::string to_string(const T &value) { |
| std::string str; |
| internal::container_buffer<std::string> buf(str); |
| writer(buf).write(value); |
| return str; |
| } |
| |
| /** |
| Converts *value* to ``std::wstring`` using the default format for type *T*. |
| */ |
| template <typename T> |
| std::wstring to_wstring(const T &value) { |
| std::wstring str; |
| internal::container_buffer<std::wstring> buf(str); |
| wwriter(buf).write(value); |
| return str; |
| } |
| |
| template <typename Char, std::size_t SIZE> |
| std::basic_string<Char> to_string(const basic_memory_buffer<Char, SIZE> &buf) { |
| return std::basic_string<Char>(buf.data(), buf.size()); |
| } |
| |
| template <typename Char> |
| typename buffer_context<Char>::type::iterator internal::vformat_to( |
| internal::basic_buffer<Char> &buf, basic_string_view<Char> format_str, |
| basic_format_args<typename buffer_context<Char>::type> args) { |
| typedef back_insert_range<internal::basic_buffer<Char> > range; |
| return vformat_to<arg_formatter<range>>( |
| buf, to_string_view(format_str), args); |
| } |
| |
| template <typename S, typename Char = FMT_CHAR(S)> |
| inline typename buffer_context<Char>::type::iterator vformat_to( |
| internal::basic_buffer<Char> &buf, const S &format_str, |
| basic_format_args<typename buffer_context<Char>::type> args) { |
| return internal::vformat_to(buf, to_string_view(format_str), args); |
| } |
| |
| template < |
| typename S, typename... Args, |
| std::size_t SIZE = inline_buffer_size, |
| typename Char = typename internal::char_t<S>::type> |
| inline typename buffer_context<Char>::type::iterator format_to( |
| basic_memory_buffer<Char, SIZE> &buf, const S &format_str, |
| const Args &... args) { |
| internal::check_format_string<Args...>(format_str); |
| typedef typename buffer_context<Char>::type context; |
| format_arg_store<context, Args...> as{args...}; |
| return internal::vformat_to(buf, to_string_view(format_str), |
| basic_format_args<context>(as)); |
| } |
| |
| namespace internal { |
| |
| // Detect the iterator category of *any* given type in a SFINAE-friendly way. |
| // Unfortunately, older implementations of std::iterator_traits are not safe |
| // for use in a SFINAE-context. |
| |
| // the gist of C++17's void_t magic |
| template<typename... Ts> |
| struct void_ { typedef void type; }; |
| |
| template <typename T, typename Enable = void> |
| struct it_category : std::false_type {}; |
| |
| template <typename T> |
| struct it_category<T*> { typedef std::random_access_iterator_tag type; }; |
| |
| template <typename T> |
| struct it_category<T, typename void_<typename T::iterator_category>::type> { |
| typedef typename T::iterator_category type; |
| }; |
| |
| // Detect if *any* given type models the OutputIterator concept. |
| template <typename It> |
| class is_output_iterator { |
| // Check for mutability because all iterator categories derived from |
| // std::input_iterator_tag *may* also meet the requirements of an |
| // OutputIterator, thereby falling into the category of 'mutable iterators' |
| // [iterator.requirements.general] clause 4. |
| // The compiler reveals this property only at the point of *actually |
| // dereferencing* the iterator! |
| template <typename U> |
| static decltype(*(internal::declval<U>())) test(std::input_iterator_tag); |
| template <typename U> |
| static char& test(std::output_iterator_tag); |
| template <typename U> |
| static const char& test(...); |
| |
| typedef decltype(test<It>(typename it_category<It>::type{})) type; |
| typedef typename std::remove_reference<type>::type result; |
| public: |
| static const bool value = !std::is_const<result>::value; |
| }; |
| } // internal |
| |
| template <typename OutputIt, typename Char = char> |
| //using format_context_t = basic_format_context<OutputIt, Char>; |
| struct format_context_t { typedef basic_format_context<OutputIt, Char> type; }; |
| |
| template <typename OutputIt, typename Char = char> |
| //using format_args_t = basic_format_args<format_context_t<OutputIt, Char>>; |
| struct format_args_t { |
| typedef basic_format_args< |
| typename format_context_t<OutputIt, Char>::type> type; |
| }; |
| |
| template <typename String, typename OutputIt, typename... Args> |
| inline typename std::enable_if<internal::is_output_iterator<OutputIt>::value, |
| OutputIt>::type |
| vformat_to(OutputIt out, const String &format_str, |
| typename format_args_t<OutputIt, FMT_CHAR(String)>::type args) { |
| typedef output_range<OutputIt, FMT_CHAR(String)> range; |
| return vformat_to<arg_formatter<range>>(range(out), |
| to_string_view(format_str), args); |
| } |
| |
| /** |
| \rst |
| Formats arguments, writes the result to the output iterator ``out`` and returns |
| the iterator past the end of the output range. |
| |
| **Example**:: |
| |
| std::vector<char> out; |
| fmt::format_to(std::back_inserter(out), "{}", 42); |
| \endrst |
| */ |
| template <typename OutputIt, typename S, typename... Args> |
| inline FMT_ENABLE_IF_T( |
| internal::is_string<S>::value && |
| internal::is_output_iterator<OutputIt>::value, OutputIt) |
| format_to(OutputIt out, const S &format_str, const Args &... args) { |
| internal::check_format_string<Args...>(format_str); |
| typedef typename format_context_t<OutputIt, FMT_CHAR(S)>::type context; |
| format_arg_store<context, Args...> as{args...}; |
| return vformat_to(out, to_string_view(format_str), |
| basic_format_args<context>(as)); |
| } |
| |
| template <typename OutputIt> |
| struct format_to_n_result { |
| /** Iterator past the end of the output range. */ |
| OutputIt out; |
| /** Total (not truncated) output size. */ |
| std::size_t size; |
| }; |
| |
| template <typename OutputIt, typename Char = typename OutputIt::value_type> |
| struct format_to_n_context : |
| format_context_t<fmt::internal::truncating_iterator<OutputIt>, Char> {}; |
| |
| template <typename OutputIt, typename Char = typename OutputIt::value_type> |
| struct format_to_n_args { |
| typedef basic_format_args< |
| typename format_to_n_context<OutputIt, Char>::type> type; |
| }; |
| |
| template <typename OutputIt, typename Char, typename ...Args> |
| inline format_arg_store< |
| typename format_to_n_context<OutputIt, Char>::type, Args...> |
| make_format_to_n_args(const Args &... args) { |
| return format_arg_store< |
| typename format_to_n_context<OutputIt, Char>::type, Args...>(args...); |
| } |
| |
| template <typename OutputIt, typename Char, typename... Args> |
| inline typename std::enable_if< |
| internal::is_output_iterator<OutputIt>::value, |
| format_to_n_result<OutputIt>>::type vformat_to_n( |
| OutputIt out, std::size_t n, basic_string_view<Char> format_str, |
| typename format_to_n_args<OutputIt, Char>::type args) { |
| typedef internal::truncating_iterator<OutputIt> It; |
| auto it = vformat_to(It(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> |
| inline FMT_ENABLE_IF_T( |
| internal::is_string<S>::value && |
| internal::is_output_iterator<OutputIt>::value, |
| format_to_n_result<OutputIt>) |
| format_to_n(OutputIt out, std::size_t n, const S &format_str, |
| const Args &... args) { |
| internal::check_format_string<Args...>(format_str); |
| typedef FMT_CHAR(S) Char; |
| format_arg_store< |
| typename format_to_n_context<OutputIt, Char>::type, Args...> as(args...); |
| return vformat_to_n(out, n, to_string_view(format_str), |
| typename format_to_n_args<OutputIt, Char>::type(as)); |
| } |
| |
| template <typename Char> |
| inline std::basic_string<Char> internal::vformat( |
| basic_string_view<Char> format_str, |
| basic_format_args<typename buffer_context<Char>::type> args) { |
| basic_memory_buffer<Char> buffer; |
| internal::vformat_to(buffer, format_str, args); |
| return fmt::to_string(buffer); |
| } |
| |
| /** |
| Returns the number of characters in the output of |
| ``format(format_str, args...)``. |
| */ |
| template <typename... Args> |
| inline std::size_t formatted_size(string_view format_str, |
| const Args &... args) { |
| auto it = format_to(internal::counting_iterator<char>(), format_str, args...); |
| return it.count(); |
| } |
| |
| #if FMT_USE_USER_DEFINED_LITERALS |
| namespace internal { |
| |
| # if FMT_UDL_TEMPLATE |
| template <typename Char, Char... CHARS> |
| class udl_formatter { |
| public: |
| template <typename... Args> |
| std::basic_string<Char> operator()(const Args &... args) const { |
| FMT_CONSTEXPR_DECL Char s[] = {CHARS..., '\0'}; |
| FMT_CONSTEXPR_DECL bool invalid_format = |
| do_check_format_string<Char, error_handler, Args...>( |
| basic_string_view<Char>(s, sizeof...(CHARS))); |
| (void)invalid_format; |
| return format(s, args...); |
| } |
| }; |
| # else |
| template <typename Char> |
| struct udl_formatter { |
| const Char *str; |
| |
| template <typename... Args> |
| auto operator()(Args &&... args) const |
| -> decltype(format(str, std::forward<Args>(args)...)) { |
| return format(str, std::forward<Args>(args)...); |
| } |
| }; |
| # endif // FMT_UDL_TEMPLATE |
| |
| template <typename Char> |
| struct udl_arg { |
| const Char *str; |
| |
| template <typename T> |
| named_arg<T, Char> operator=(T &&value) const { |
| return {str, std::forward<T>(value)}; |
| } |
| }; |
| |
| } // namespace internal |
| |
| inline namespace literals { |
| |
| # if FMT_UDL_TEMPLATE |
| template <typename Char, Char... CHARS> |
| FMT_CONSTEXPR internal::udl_formatter<Char, CHARS...> operator""_format() { |
| return {}; |
| } |
| # else |
| /** |
| \rst |
| User-defined literal equivalent of :func:`fmt::format`. |
| |
| **Example**:: |
| |
| using namespace fmt::literals; |
| std::string message = "The answer is {}"_format(42); |
| \endrst |
| */ |
| inline internal::udl_formatter<char> |
| operator"" _format(const char *s, std::size_t) { return {s}; } |
| inline internal::udl_formatter<wchar_t> |
| operator"" _format(const wchar_t *s, std::size_t) { return {s}; } |
| # endif // FMT_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 |
| */ |
| inline internal::udl_arg<char> |
| operator"" _a(const char *s, std::size_t) { return {s}; } |
| inline internal::udl_arg<wchar_t> |
| operator"" _a(const wchar_t *s, std::size_t) { return {s}; } |
| } // inline namespace literals |
| #endif // FMT_USE_USER_DEFINED_LITERALS |
| FMT_END_NAMESPACE |
| |
| #define FMT_STRING(s) [] { \ |
| typedef typename std::remove_cv<std::remove_pointer< \ |
| typename std::decay<decltype(s)>::type>::type>::type ct; \ |
| struct str : fmt::compile_string { \ |
| typedef ct char_type; \ |
| FMT_CONSTEXPR operator fmt::basic_string_view<ct>() const { \ |
| return {s, sizeof(s) / sizeof(ct) - 1}; \ |
| } \ |
| }; \ |
| return str{}; \ |
| }() |
| |
| #if defined(FMT_STRING_ALIAS) && FMT_STRING_ALIAS |
| /** |
| \rst |
| Constructs a compile-time format string. This macro is disabled by default to |
| prevent potential name collisions. To enable it define ``FMT_STRING_ALIAS`` to |
| 1 before including ``fmt/format.h``. |
| |
| **Example**:: |
| |
| #define FMT_STRING_ALIAS 1 |
| #include <fmt/format.h> |
| // A compile-time error because 'd' is an invalid specifier for strings. |
| std::string s = format(fmt("{:d}"), "foo"); |
| \endrst |
| */ |
| # define fmt(s) FMT_STRING(s) |
| #endif |
| |
| #ifdef FMT_HEADER_ONLY |
| # define FMT_FUNC inline |
| # include "format-inl.h" |
| #else |
| # define FMT_FUNC |
| #endif |
| |
| // Restore warnings. |
| #if FMT_GCC_VERSION >= 406 || FMT_CLANG_VERSION |
| # pragma GCC diagnostic pop |
| #endif |
| |
| #endif // FMT_FORMAT_H_ |