| /* |
| Formatting library for C++ |
| |
| Copyright (c) 2012 - present, Victor Zverovich |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| --- Optional exception to the license --- |
| |
| As an exception, if, as a result of your compiling your source code, portions |
| of this Software are embedded into a machine-executable object form of such |
| source code, you may redistribute such embedded portions in such object form |
| without including the above copyright and permission notices. |
| */ |
| |
| #ifndef FMT_FORMAT_H_ |
| #define FMT_FORMAT_H_ |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <cstdint> |
| #include <cstring> |
| #include <iterator> |
| #include <limits> |
| #include <memory> |
| #include <stdexcept> |
| |
| #include "core.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 |
| |
| #ifdef __has_builtin |
| # define FMT_HAS_BUILTIN(x) __has_builtin(x) |
| #else |
| # define FMT_HAS_BUILTIN(x) 0 |
| #endif |
| |
| #if FMT_HAS_CPP_ATTRIBUTE(fallthrough) >= 201603 && __cplusplus >= 201703 |
| # define FMT_FALLTHROUGH [[fallthrough]] |
| #else |
| # define FMT_FALLTHROUGH |
| #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; |
| } |
| } // namespace internal |
| 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)); \ |
| FMT_ASSERT(false, ""); \ |
| } while (false) |
| # endif |
| #endif |
| |
| #ifndef FMT_USE_USER_DEFINED_LITERALS |
| // For Intel and NVIDIA compilers both they and the system gcc/msc 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 |
| |
| #ifndef FMT_USE_UDL_TEMPLATE |
| // EDG front end based compilers (icc, nvcc) do not support UDL templates yet |
| // and GCC 9 warns about them. |
| # if FMT_USE_USER_DEFINED_LITERALS && FMT_ICC_VERSION == 0 && \ |
| FMT_CUDA_VERSION == 0 && \ |
| ((FMT_GCC_VERSION >= 600 && FMT_GCC_VERSION <= 900 && \ |
| __cplusplus >= 201402L) || \ |
| FMT_CLANG_VERSION >= 304) |
| # define FMT_USE_UDL_TEMPLATE 1 |
| # else |
| # define FMT_USE_UDL_TEMPLATE 0 |
| # endif |
| #endif |
| |
| // __builtin_clz is broken in clang with Microsoft CodeGen: |
| // https://github.com/fmtlib/fmt/issues/519 |
| #if (FMT_GCC_VERSION || FMT_HAS_BUILTIN(__builtin_clz)) && !FMT_MSC_VER |
| # define FMT_BUILTIN_CLZ(n) __builtin_clz(n) |
| #endif |
| #if (FMT_GCC_VERSION || FMT_HAS_BUILTIN(__builtin_clzll)) && !FMT_MSC_VER |
| # define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n) |
| #endif |
| |
| // Some compilers masquerade as both MSVC and GCC-likes or otherwise support |
| // __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the |
| // MSVC intrinsics if the clz and clzll builtins are not available. |
| #if FMT_MSC_VER && !defined(FMT_BUILTIN_CLZLL) && !defined(_MANAGED) |
| # include <intrin.h> // _BitScanReverse, _BitScanReverse64 |
| |
| FMT_BEGIN_NAMESPACE |
| namespace 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); |
| |
| FMT_ASSERT(x != 0, ""); |
| // Static analysis complains about using uninitialized data |
| // "r", but the only way that can happen is if "x" is 0, |
| // which the callers guarantee to not happen. |
| # 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 |
| |
| FMT_ASSERT(x != 0, ""); |
| // Static analysis complains about using uninitialized data |
| // "r", but the only way that can happen is if "x" is 0, |
| // which the callers guarantee to not happen. |
| # pragma warning(suppress : 6102) |
| return 63 - r; |
| } |
| # define FMT_BUILTIN_CLZLL(n) fmt::internal::clzll(n) |
| } // namespace internal |
| FMT_END_NAMESPACE |
| #endif |
| |
| // Enable the deprecated numeric alignment. |
| #ifndef FMT_NUMERIC_ALIGN |
| # define FMT_NUMERIC_ALIGN 1 |
| #endif |
| |
| // Enable the deprecated percent specifier. |
| #ifndef FMT_DEPRECATED_PERCENT |
| # define FMT_DEPRECATED_PERCENT 0 |
| #endif |
| |
| FMT_BEGIN_NAMESPACE |
| namespace internal { |
| |
| // A helper function to suppress bogus "conditional expression is constant" |
| // warnings. |
| template <typename T> inline T const_check(T value) { return value; } |
| |
| // A fallback implementation of uintptr_t for systems that lack it. |
| struct fallback_uintptr { |
| unsigned char value[sizeof(void*)]; |
| }; |
| #ifdef UINTPTR_MAX |
| using uintptr_t = ::uintptr_t; |
| #else |
| using uintptr_t = fallback_uintptr; |
| #endif |
| |
| // 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; |
| } |
| |
| // Returns the largest possible value for type T. Same as |
| // std::numeric_limits<T>::max() but shorter and not affected by the max macro. |
| template <typename T> constexpr T max_value() { |
| return (std::numeric_limits<T>::max)(); |
| } |
| |
| // An approximation of iterator_t for pre-C++20 systems. |
| template <typename T> |
| using iterator_t = decltype(std::begin(std::declval<T&>())); |
| |
| // 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. |
| template <typename It, typename Enable = void> |
| struct iterator_category : std::false_type {}; |
| |
| template <typename T> struct iterator_category<T*> { |
| using type = std::random_access_iterator_tag; |
| }; |
| |
| template <typename It> |
| struct iterator_category<It, void_t<typename It::iterator_category>> { |
| using type = typename It::iterator_category; |
| }; |
| |
| // 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(*(std::declval<U>())) test(std::input_iterator_tag); |
| template <typename U> static char& test(std::output_iterator_tag); |
| template <typename U> static const char& test(...); |
| |
| using type = decltype(test<It>(typename iterator_category<It>::type{})); |
| |
| public: |
| static const bool value = !std::is_const<remove_reference_t<type>>::value; |
| }; |
| |
| // A workaround for std::string not having mutable data() until C++17. |
| template <typename Char> inline Char* get_data(std::basic_string<Char>& s) { |
| return &s[0]; |
| } |
| template <typename Container> |
| inline typename Container::value_type* get_data(Container& c) { |
| return c.data(); |
| } |
| |
| #ifdef _SECURE_SCL |
| // Make a checked iterator to avoid MSVC warnings. |
| template <typename T> using checked_ptr = stdext::checked_array_iterator<T*>; |
| template <typename T> checked_ptr<T> make_checked(T* p, std::size_t size) { |
| return {p, size}; |
| } |
| #else |
| template <typename T> using checked_ptr = T*; |
| template <typename T> inline T* make_checked(T* p, std::size_t) { return p; } |
| #endif |
| |
| template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)> |
| inline checked_ptr<typename Container::value_type> reserve( |
| std::back_insert_iterator<Container>& it, std::size_t n) { |
| Container& c = get_container(it); |
| std::size_t size = c.size(); |
| c.resize(size + n); |
| return make_checked(get_data(c) + size, n); |
| } |
| |
| template <typename Iterator> |
| inline Iterator& reserve(Iterator& it, std::size_t) { |
| return it; |
| } |
| |
| // An output iterator that counts the number of objects written to it and |
| // discards them. |
| class counting_iterator { |
| private: |
| std::size_t count_; |
| |
| public: |
| using iterator_category = std::output_iterator_tag; |
| using difference_type = std::ptrdiff_t; |
| using pointer = void; |
| using reference = void; |
| using _Unchecked_type = counting_iterator; // Mark iterator as checked. |
| |
| struct value_type { |
| template <typename T> void operator=(const T&) {} |
| }; |
| |
| counting_iterator() : count_(0) {} |
| |
| std::size_t count() const { return count_; } |
| |
| counting_iterator& operator++() { |
| ++count_; |
| return *this; |
| } |
| |
| counting_iterator operator++(int) { |
| auto it = *this; |
| ++*this; |
| return it; |
| } |
| |
| value_type operator*() const { return {}; } |
| }; |
| |
| template <typename OutputIt> class truncating_iterator_base { |
| protected: |
| OutputIt out_; |
| std::size_t limit_; |
| std::size_t count_; |
| |
| truncating_iterator_base(OutputIt out, std::size_t limit) |
| : out_(out), limit_(limit), count_(0) {} |
| |
| public: |
| using iterator_category = std::output_iterator_tag; |
| using difference_type = void; |
| using pointer = void; |
| using reference = void; |
| using _Unchecked_type = |
| truncating_iterator_base; // Mark iterator as checked. |
| |
| OutputIt base() const { return out_; } |
| 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> { |
| using traits = std::iterator_traits<OutputIt>; |
| |
| mutable typename traits::value_type blackhole_; |
| |
| public: |
| using value_type = typename traits::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: |
| using value_type = typename OutputIt::container_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; } |
| }; |
| |
| // A range with the specified output iterator and value type. |
| template <typename OutputIt, typename T = typename OutputIt::value_type> |
| class output_range { |
| private: |
| OutputIt it_; |
| |
| public: |
| using value_type = T; |
| using iterator = OutputIt; |
| struct sentinel {}; |
| |
| explicit output_range(OutputIt it) : it_(it) {} |
| OutputIt begin() const { return it_; } |
| sentinel end() const { return {}; } // Sentinel is not used yet. |
| }; |
| |
| template <typename Char> |
| inline size_t count_code_points(basic_string_view<Char> s) { |
| return s.size(); |
| } |
| |
| // Counts the number of code points in a UTF-8 string. |
| inline size_t count_code_points(basic_string_view<char8_t> s) { |
| const char8_t* data = s.data(); |
| size_t num_code_points = 0; |
| for (size_t i = 0, size = s.size(); i != size; ++i) { |
| if ((data[i] & 0xc0) != 0x80) ++num_code_points; |
| } |
| return num_code_points; |
| } |
| |
| template <typename Char> |
| inline size_t code_point_index(basic_string_view<Char> s, size_t n) { |
| size_t size = s.size(); |
| return n < size ? n : size; |
| } |
| |
| // Calculates the index of the nth code point in a UTF-8 string. |
| inline size_t code_point_index(basic_string_view<char8_t> s, size_t n) { |
| const char8_t* data = s.data(); |
| size_t num_code_points = 0; |
| for (size_t i = 0, size = s.size(); i != size; ++i) { |
| if ((data[i] & 0xc0) != 0x80 && ++num_code_points > n) { |
| return i; |
| } |
| } |
| return s.size(); |
| } |
| |
| inline char8_t to_char8_t(char c) { return static_cast<char8_t>(c); } |
| |
| template <typename InputIt, typename OutChar> |
| using needs_conversion = bool_constant< |
| std::is_same<typename std::iterator_traits<InputIt>::value_type, |
| char>::value && |
| std::is_same<OutChar, char8_t>::value>; |
| |
| template <typename OutChar, typename InputIt, typename OutputIt, |
| FMT_ENABLE_IF(!needs_conversion<InputIt, OutChar>::value)> |
| OutputIt copy_str(InputIt begin, InputIt end, OutputIt it) { |
| return std::copy(begin, end, it); |
| } |
| |
| template <typename OutChar, typename InputIt, typename OutputIt, |
| FMT_ENABLE_IF(needs_conversion<InputIt, OutChar>::value)> |
| OutputIt copy_str(InputIt begin, InputIt end, OutputIt it) { |
| return std::transform(begin, end, it, to_char8_t); |
| } |
| |
| #ifndef FMT_USE_GRISU |
| # define FMT_USE_GRISU 1 |
| #endif |
| |
| template <typename T> constexpr bool use_grisu() { |
| return FMT_USE_GRISU && std::numeric_limits<double>::is_iec559 && |
| sizeof(T) <= sizeof(double); |
| } |
| |
| template <typename T> |
| template <typename U> |
| void buffer<T>::append(const U* begin, const U* end) { |
| std::size_t new_size = size_ + to_unsigned(end - begin); |
| reserve(new_size); |
| std::uninitialized_copy(begin, end, make_checked(ptr_, capacity_) + size_); |
| size_ = new_size; |
| } |
| } // namespace internal |
| |
| // A range with an iterator appending to a buffer. |
| template <typename T> |
| class buffer_range : public internal::output_range< |
| std::back_insert_iterator<internal::buffer<T>>, T> { |
| public: |
| using iterator = std::back_insert_iterator<internal::buffer<T>>; |
| using internal::output_range<iterator, T>::output_range; |
| buffer_range(internal::buffer<T>& buf) |
| : internal::output_range<iterator, T>(std::back_inserter(buf)) {} |
| }; |
| |
| // A UTF-8 string view. |
| class u8string_view : public basic_string_view<char8_t> { |
| public: |
| 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}; |
| } |
| } // namespace literals |
| #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 type aliases for common character types: |
| |
| +----------------+------------------------------+ |
| | Type | Definition | |
| +================+==============================+ |
| | memory_buffer | basic_memory_buffer<char> | |
| +----------------+------------------------------+ |
| | wmemory_buffer | basic_memory_buffer<wchar_t> | |
| +----------------+------------------------------+ |
| |
| **Example**:: |
| |
| fmt::memory_buffer out; |
| format_to(out, "The answer is {}.", 42); |
| |
| This will append the following output to the ``out`` object: |
| |
| .. code-block:: none |
| |
| The answer is 42. |
| |
| The output can be converted to an ``std::string`` with ``to_string(out)``. |
| \endrst |
| */ |
| template <typename T, std::size_t SIZE = inline_buffer_size, |
| typename Allocator = std::allocator<T>> |
| class basic_memory_buffer : private Allocator, public internal::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: |
| using value_type = T; |
| using const_reference = const T&; |
| |
| explicit basic_memory_buffer(const Allocator& alloc = Allocator()) |
| : Allocator(alloc) { |
| this->set(store_, SIZE); |
| } |
| ~basic_memory_buffer() FMT_OVERRIDE { 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) FMT_NOEXCEPT { move(other); } |
| |
| /** |
| \rst |
| Moves the content of the other ``basic_memory_buffer`` object to this one. |
| \endrst |
| */ |
| basic_memory_buffer& operator=(basic_memory_buffer&& other) FMT_NOEXCEPT { |
| FMT_ASSERT(this != &other, ""); |
| deallocate(); |
| move(other); |
| return *this; |
| } |
| |
| // Returns a copy of the allocator associated with this buffer. |
| Allocator get_allocator() const { return *this; } |
| }; |
| |
| template <typename T, std::size_t SIZE, typename Allocator> |
| void basic_memory_buffer<T, SIZE, Allocator>::grow(std::size_t size) { |
| #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| if (size > 1000) throw std::runtime_error("fuzz mode - won't grow that much"); |
| #endif |
| 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 = std::allocator_traits<Allocator>::allocate(*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); |
| } |
| |
| using memory_buffer = basic_memory_buffer<char>; |
| using wmemory_buffer = basic_memory_buffer<wchar_t>; |
| |
| /** A formatting error such as invalid format string. */ |
| class FMT_API format_error : public std::runtime_error { |
| public: |
| explicit format_error(const char* message) : std::runtime_error(message) {} |
| explicit format_error(const std::string& message) |
| : std::runtime_error(message) {} |
| format_error(const format_error&) = default; |
| format_error& operator=(const format_error&) = default; |
| format_error(format_error&&) = default; |
| format_error& operator=(format_error&&) = default; |
| ~format_error() FMT_NOEXCEPT FMT_OVERRIDE; |
| }; |
| |
| namespace internal { |
| |
| // Returns true if value is negative, false otherwise. |
| // Same as `value < 0` but doesn't produce warnings if T is an unsigned type. |
| template <typename T, FMT_ENABLE_IF(std::numeric_limits<T>::is_signed)> |
| FMT_CONSTEXPR bool is_negative(T value) { |
| return value < 0; |
| } |
| template <typename T, FMT_ENABLE_IF(!std::numeric_limits<T>::is_signed)> |
| FMT_CONSTEXPR bool is_negative(T) { |
| return false; |
| } |
| |
| // Smallest of uint32_t, uint64_t, uint128_t that is large enough to |
| // represent all values of T. |
| template <typename T> |
| using uint32_or_64_or_128_t = conditional_t< |
| std::numeric_limits<T>::digits <= 32, uint32_t, |
| conditional_t<std::numeric_limits<T>::digits <= 64, uint64_t, uint128_t>>; |
| |
| // Static data is placed in this class template for the header-only config. |
| template <typename T = void> struct FMT_EXTERN_TEMPLATE_API basic_data { |
| static const uint64_t powers_of_10_64[]; |
| static const uint32_t zero_or_powers_of_10_32[]; |
| static const uint64_t zero_or_powers_of_10_64[]; |
| static const uint64_t pow10_significands[]; |
| static const int16_t pow10_exponents[]; |
| static const char digits[]; |
| static const char hex_digits[]; |
| static const char foreground_color[]; |
| static const char background_color[]; |
| static const char reset_color[5]; |
| static const wchar_t wreset_color[5]; |
| static const char signs[]; |
| }; |
| |
| FMT_EXTERN template struct basic_data<void>; |
| |
| // This is a struct rather than an alias to avoid shadowing warnings in gcc. |
| struct data : basic_data<> {}; |
| |
| #ifdef FMT_BUILTIN_CLZLL |
| // Returns the number of decimal digits in n. Leading zeros are not counted |
| // except for n == 0 in which case count_digits returns 1. |
| inline int count_digits(uint64_t n) { |
| // Based on http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10 |
| // and the benchmark https://github.com/localvoid/cxx-benchmark-count-digits. |
| int t = (64 - FMT_BUILTIN_CLZLL(n | 1)) * 1233 >> 12; |
| return t - (n < data::zero_or_powers_of_10_64[t]) + 1; |
| } |
| #else |
| // Fallback version of count_digits used when __builtin_clz is not available. |
| inline int count_digits(uint64_t n) { |
| int count = 1; |
| for (;;) { |
| // Integer division is slow so do it for a group of four digits instead |
| // of for every digit. The idea comes from the talk by Alexandrescu |
| // "Three Optimization Tips for C++". See speed-test for a comparison. |
| if (n < 10) return count; |
| if (n < 100) return count + 1; |
| if (n < 1000) return count + 2; |
| if (n < 10000) return count + 3; |
| n /= 10000u; |
| count += 4; |
| } |
| } |
| #endif |
| |
| #if FMT_USE_INT128 |
| inline int count_digits(uint128_t n) { |
| int count = 1; |
| for (;;) { |
| // Integer division is slow so do it for a group of four digits instead |
| // of for every digit. The idea comes from the talk by Alexandrescu |
| // "Three Optimization Tips for C++". See speed-test for a comparison. |
| if (n < 10) return count; |
| if (n < 100) return count + 1; |
| if (n < 1000) return count + 2; |
| if (n < 10000) return count + 3; |
| n /= 10000U; |
| count += 4; |
| } |
| } |
| #endif |
| |
| // Counts the number of digits in n. BITS = log2(radix). |
| template <unsigned BITS, typename UInt> inline int count_digits(UInt n) { |
| int num_digits = 0; |
| do { |
| ++num_digits; |
| } while ((n >>= BITS) != 0); |
| return num_digits; |
| } |
| |
| template <> int count_digits<4>(internal::fallback_uintptr n); |
| |
| #if FMT_GCC_VERSION || FMT_CLANG_VERSION |
| # define FMT_ALWAYS_INLINE inline __attribute__((always_inline)) |
| #else |
| # define FMT_ALWAYS_INLINE |
| #endif |
| |
| // Computes g = floor(log10(n)) and calls h.on<g>(n); |
| template <typename Handler> FMT_ALWAYS_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; |
| } |
| }; |
| |
| #ifdef FMT_BUILTIN_CLZ |
| // Optional version of count_digits for better performance on 32-bit platforms. |
| inline int count_digits(uint32_t n) { |
| int t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12; |
| return t - (n < data::zero_or_powers_of_10_32[t]) + 1; |
| } |
| #endif |
| |
| template <typename Char> FMT_API std::string grouping_impl(locale_ref loc); |
| template <typename Char> inline std::string grouping(locale_ref loc) { |
| return grouping_impl<char>(loc); |
| } |
| template <> inline std::string grouping<wchar_t>(locale_ref loc) { |
| return grouping_impl<wchar_t>(loc); |
| } |
| |
| template <typename Char> FMT_API Char thousands_sep_impl(locale_ref loc); |
| template <typename Char> inline Char thousands_sep(locale_ref loc) { |
| return Char(thousands_sep_impl<char>(loc)); |
| } |
| template <> inline wchar_t thousands_sep(locale_ref loc) { |
| return thousands_sep_impl<wchar_t>(loc); |
| } |
| |
| template <typename Char> FMT_API Char decimal_point_impl(locale_ref loc); |
| template <typename Char> inline Char decimal_point(locale_ref loc) { |
| return Char(decimal_point_impl<char>(loc)); |
| } |
| template <> inline wchar_t decimal_point(locale_ref loc) { |
| return decimal_point_impl<wchar_t>(loc); |
| } |
| |
| // Formats a decimal unsigned integer value writing into buffer. |
| // add_thousands_sep is called after writing each char to add a thousands |
| // separator if necessary. |
| template <typename UInt, typename Char, typename F> |
| inline Char* format_decimal(Char* buffer, UInt value, int num_digits, |
| F add_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. |
| auto index = static_cast<unsigned>((value % 100) * 2); |
| value /= 100; |
| *--buffer = static_cast<Char>(data::digits[index + 1]); |
| add_thousands_sep(buffer); |
| *--buffer = static_cast<Char>(data::digits[index]); |
| add_thousands_sep(buffer); |
| } |
| if (value < 10) { |
| *--buffer = static_cast<Char>('0' + value); |
| return end; |
| } |
| auto index = static_cast<unsigned>(value * 2); |
| *--buffer = static_cast<Char>(data::digits[index + 1]); |
| add_thousands_sep(buffer); |
| *--buffer = static_cast<Char>(data::digits[index]); |
| return end; |
| } |
| |
| template <typename Int> constexpr int digits10() noexcept { |
| return std::numeric_limits<Int>::digits10; |
| } |
| template <> constexpr int digits10<int128_t>() noexcept { return 38; } |
| template <> constexpr int digits10<uint128_t>() noexcept { return 38; } |
| |
| template <typename Char, typename UInt, typename Iterator, typename F> |
| inline Iterator format_decimal(Iterator out, UInt value, int num_digits, |
| F add_thousands_sep) { |
| FMT_ASSERT(num_digits >= 0, "invalid digit count"); |
| // Buffer should be large enough to hold all digits (<= digits10 + 1). |
| enum { max_size = digits10<UInt>() + 1 }; |
| Char buffer[2 * max_size]; |
| auto end = format_decimal(buffer, value, num_digits, add_thousands_sep); |
| return internal::copy_str<Char>(buffer, end, out); |
| } |
| |
| template <typename Char, typename It, typename UInt> |
| inline It format_decimal(It out, UInt value, int num_digits) { |
| return format_decimal<Char>(out, value, num_digits, [](Char*) {}); |
| } |
| |
| template <unsigned BASE_BITS, typename Char, typename UInt> |
| inline Char* format_uint(Char* buffer, UInt value, int num_digits, |
| bool upper = false) { |
| buffer += num_digits; |
| Char* end = buffer; |
| do { |
| const char* digits = upper ? "0123456789ABCDEF" : data::hex_digits; |
| unsigned digit = (value & ((1 << BASE_BITS) - 1)); |
| *--buffer = static_cast<Char>(BASE_BITS < 4 ? static_cast<char>('0' + digit) |
| : digits[digit]); |
| } while ((value >>= BASE_BITS) != 0); |
| return end; |
| } |
| |
| template <unsigned BASE_BITS, typename Char> |
| Char* format_uint(Char* buffer, internal::fallback_uintptr n, int num_digits, |
| bool = false) { |
| auto char_digits = std::numeric_limits<unsigned char>::digits / 4; |
| int start = (num_digits + char_digits - 1) / char_digits - 1; |
| if (int start_digits = num_digits % char_digits) { |
| unsigned value = n.value[start--]; |
| buffer = format_uint<BASE_BITS>(buffer, value, start_digits); |
| } |
| for (; start >= 0; --start) { |
| unsigned value = n.value[start]; |
| buffer += char_digits; |
| auto p = buffer; |
| for (int i = 0; i < char_digits; ++i) { |
| unsigned digit = (value & ((1 << BASE_BITS) - 1)); |
| *--p = static_cast<Char>(data::hex_digits[digit]); |
| value >>= BASE_BITS; |
| } |
| } |
| return buffer; |
| } |
| |
| template <unsigned BASE_BITS, typename Char, typename It, typename UInt> |
| inline It format_uint(It out, UInt value, int num_digits, bool upper = false) { |
| // Buffer should be large enough to hold all digits (digits / BASE_BITS + 1). |
| char buffer[std::numeric_limits<UInt>::digits / BASE_BITS + 1]; |
| 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<char>& out, |
| int error_code, |
| fmt::string_view message) FMT_NOEXCEPT; |
| #endif |
| |
| template <typename T = void> struct null {}; |
| |
| // Workaround an array initialization issue in gcc 4.8. |
| template <typename Char> struct fill_t { |
| private: |
| Char data_[6]; |
| |
| public: |
| FMT_CONSTEXPR Char& operator[](size_t index) { return data_[index]; } |
| FMT_CONSTEXPR const Char& operator[](size_t index) const { |
| return data_[index]; |
| } |
| |
| static FMT_CONSTEXPR fill_t<Char> make() { |
| auto fill = fill_t<Char>(); |
| fill[0] = Char(' '); |
| return fill; |
| } |
| }; |
| } // namespace internal |
| |
| // We cannot use enum classes as bit fields because of a gcc bug |
| // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414. |
| namespace align { |
| enum type { none, left, right, center, numeric }; |
| } |
| using align_t = align::type; |
| |
| namespace sign { |
| enum type { none, minus, plus, space }; |
| } |
| using sign_t = sign::type; |
| |
| // Format specifiers for built-in and string types. |
| template <typename Char> struct basic_format_specs { |
| int width; |
| int precision; |
| char type; |
| align_t align : 4; |
| sign_t sign : 3; |
| bool alt : 1; // Alternate form ('#'). |
| internal::fill_t<Char> fill; |
| |
| constexpr basic_format_specs() |
| : width(0), |
| precision(-1), |
| type(0), |
| align(align::none), |
| sign(sign::none), |
| alt(false), |
| fill(internal::fill_t<Char>::make()) {} |
| }; |
| |
| using format_specs = basic_format_specs<char>; |
| |
| namespace internal { |
| |
| // A floating-point presentation format. |
| enum class float_format { |
| shortest, // Shortest round-trip format. |
| general, // General: exponent notation or fixed point based on magnitude. |
| exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3. |
| fixed, // Fixed point with the default precision of 6, e.g. 0.0012. |
| hex |
| }; |
| |
| struct float_spec { |
| float_format format; |
| bool upper; |
| bool locale; |
| bool percent; |
| }; |
| |
| struct gen_digits_params { |
| int num_digits; |
| sign_t sign : 3; |
| float_format format; |
| bool upper; |
| bool trailing_zeros; |
| }; |
| |
| // Writes the exponent exp in the form "[+-]d{2,3}" to buffer. |
| template <typename Char, typename It> It write_exponent(int exp, It it) { |
| FMT_ASSERT(-1000 < exp && exp < 1000, "exponent out of range"); |
| if (exp < 0) { |
| *it++ = static_cast<Char>('-'); |
| exp = -exp; |
| } else { |
| *it++ = static_cast<Char>('+'); |
| } |
| if (exp >= 100) { |
| *it++ = static_cast<Char>(static_cast<char>('0' + exp / 100)); |
| exp %= 100; |
| } |
| const char* d = data::digits + exp * 2; |
| *it++ = static_cast<Char>(d[0]); |
| *it++ = static_cast<Char>(d[1]); |
| return it; |
| } |
| |
| template <typename Char> class grisu_writer { |
| private: |
| // The number is given as v = digits_ * pow(10, exp_). |
| const char* digits_; |
| int num_digits_; |
| int exp_; |
| size_t size_; |
| gen_digits_params params_; |
| Char decimal_point_; |
| |
| template <typename It> It grisu_prettify(It it) const { |
| // pow(10, full_exp - 1) <= v <= pow(10, full_exp). |
| int full_exp = num_digits_ + exp_; |
| if (params_.format == float_format::exp) { |
| // Insert a decimal point after the first digit and add an exponent. |
| *it++ = static_cast<Char>(*digits_); |
| if (num_digits_ > 1) *it++ = decimal_point_; |
| it = copy_str<Char>(digits_ + 1, digits_ + num_digits_, it); |
| *it++ = static_cast<Char>(params_.upper ? 'E' : 'e'); |
| return write_exponent<Char>(full_exp - 1, it); |
| } |
| if (num_digits_ <= full_exp) { |
| // 1234e7 -> 12340000000[.0+] |
| it = copy_str<Char>(digits_, digits_ + num_digits_, it); |
| it = std::fill_n(it, full_exp - num_digits_, static_cast<Char>('0')); |
| int num_zeros = (std::max)(params_.num_digits - full_exp, 1); |
| if (params_.trailing_zeros) { |
| *it++ = decimal_point_; |
| #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| if (num_zeros > 1000) |
| throw std::runtime_error("fuzz mode - avoiding excessive cpu use"); |
| #endif |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| } |
| } else if (full_exp > 0) { |
| // 1234e-2 -> 12.34[0+] |
| it = copy_str<Char>(digits_, digits_ + full_exp, it); |
| if (!params_.trailing_zeros) { |
| // Remove trailing zeros. |
| int num_digits = num_digits_; |
| while (num_digits > full_exp && digits_[num_digits - 1] == '0') |
| --num_digits; |
| if (num_digits != full_exp) *it++ = decimal_point_; |
| return copy_str<Char>(digits_ + full_exp, digits_ + num_digits, it); |
| } |
| *it++ = decimal_point_; |
| it = copy_str<Char>(digits_ + full_exp, digits_ + num_digits_, it); |
| if (params_.num_digits > num_digits_) { |
| // Add trailing zeros. |
| int num_zeros = params_.num_digits - num_digits_; |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| } |
| } else { |
| // 1234e-6 -> 0.001234 |
| *it++ = static_cast<Char>('0'); |
| int num_zeros = -full_exp; |
| if (params_.num_digits >= 0 && params_.num_digits < num_zeros) |
| num_zeros = params_.num_digits; |
| int num_digits = num_digits_; |
| if (!params_.trailing_zeros) |
| while (num_digits > 0 && digits_[num_digits - 1] == '0') --num_digits; |
| if (num_zeros != 0 || num_digits != 0) { |
| *it++ = decimal_point_; |
| it = std::fill_n(it, num_zeros, static_cast<Char>('0')); |
| it = copy_str<Char>(digits_, digits_ + num_digits, it); |
| } |
| } |
| return it; |
| } |
| |
| public: |
| grisu_writer(const char* digits, int num_digits, int exp, |
| gen_digits_params params, Char decimal_point) |
| : digits_(digits), |
| num_digits_(num_digits), |
| exp_(exp), |
| params_(params), |
| decimal_point_(decimal_point) { |
| int full_exp = num_digits + exp - 1; |
| int precision = params.num_digits > 0 ? params.num_digits : 16; |
| if (params_.format == float_format::general) { |
| params_.format = full_exp >= -4 && full_exp < precision |
| ? float_format::fixed |
| : float_format::exp; |
| } |
| size_ = grisu_prettify(counting_iterator()).count(); |
| size_ += params_.sign ? 1 : 0; |
| } |
| |
| size_t size() const { return size_; } |
| size_t width() const { return size(); } |
| |
| template <typename It> void operator()(It&& it) { |
| if (params_.sign) *it++ = static_cast<Char>(data::signs[params_.sign]); |
| it = grisu_prettify(it); |
| } |
| }; |
| |
| namespace grisu_options { |
| enum { fixed = 1, binary32 = 2 }; |
| } |
| |
| // Formats value using the Grisu algorithm: |
| // https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf |
| template <typename Double, FMT_ENABLE_IF(sizeof(Double) == sizeof(uint64_t))> |
| FMT_API bool grisu_format(Double, buffer<char>&, int, unsigned, int&); |
| template <typename Double, FMT_ENABLE_IF(sizeof(Double) != sizeof(uint64_t))> |
| inline bool grisu_format(Double, buffer<char>&, int, unsigned, int&) { |
| return false; |
| } |
| |
| struct sprintf_specs { |
| int precision; |
| char type; |
| bool alt : 1; |
| |
| template <typename Char> |
| constexpr sprintf_specs(basic_format_specs<Char> specs) |
| : precision(specs.precision), type(specs.type), alt(specs.alt) {} |
| |
| constexpr bool has_precision() const { return precision >= 0; } |
| }; |
| |
| template <typename Double> |
| char* sprintf_format(Double, internal::buffer<char>&, sprintf_specs); |
| |
| template <> |
| inline char* sprintf_format<float>(float value, internal::buffer<char>& buf, |
| sprintf_specs specs) { |
| // printf does not have a float format specifier, it only supports double. |
| return sprintf_format<double>(value, buf, 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 ErrorHandler = error_handler> |
| FMT_CONSTEXPR float_spec parse_float_type_spec(char spec, |
| ErrorHandler&& eh = {}) { |
| auto result = float_spec(); |
| switch (spec) { |
| case 'G': |
| result.upper = true; |
| FMT_FALLTHROUGH; |
| case 0: |
| case 'g': |
| result.format = float_format::general; |
| break; |
| case 'E': |
| result.upper = true; |
| FMT_FALLTHROUGH; |
| case 'e': |
| result.format = float_format::exp; |
| break; |
| case 'F': |
| result.upper = true; |
| FMT_FALLTHROUGH; |
| case 'f': |
| result.format = float_format::fixed; |
| break; |
| case '%': |
| #if FMT_DEPRECATED_PERCENT |
| result.format = float_format::fixed; |
| result.percent = true; |
| #endif |
| break; |
| case 'A': |
| result.upper = true; |
| FMT_FALLTHROUGH; |
| case 'a': |
| result.format = float_format::hex; |
| break; |
| case 'n': |
| result.locale = true; |
| break; |
| default: |
| eh.on_error("invalid type specifier"); |
| break; |
| } |
| return result; |
| } |
| |
| template <typename Char, typename Handler> |
| FMT_CONSTEXPR void handle_char_specs(const basic_format_specs<Char>* specs, |
| Handler&& handler) { |
| if (!specs) return handler.on_char(); |
| if (specs->type && specs->type != 'c') return handler.on_int(); |
| if (specs->align == align::numeric || specs->sign != sign::none || specs->alt) |
| handler.on_error("invalid format specifier for char"); |
| handler.on_char(); |
| } |
| |
| template <typename Char, typename Handler> |
| FMT_CONSTEXPR void handle_cstring_type_spec(Char spec, Handler&& handler) { |
| if (spec == 0 || spec == 's') |
| handler.on_string(); |
| else if (spec == 'p') |
| handler.on_pointer(); |
| else |
| handler.on_error("invalid type specifier"); |
| } |
| |
| template <typename Char, typename ErrorHandler> |
| FMT_CONSTEXPR void check_string_type_spec(Char spec, ErrorHandler&& eh) { |
| if (spec != 0 && spec != 's') eh.on_error("invalid type specifier"); |
| } |
| |
| template <typename Char, typename ErrorHandler> |
| FMT_CONSTEXPR void check_pointer_type_spec(Char spec, ErrorHandler&& eh) { |
| if (spec != 0 && spec != 'p') eh.on_error("invalid type specifier"); |
| } |
| |
| template <typename ErrorHandler> class int_type_checker : private ErrorHandler { |
| public: |
| FMT_CONSTEXPR explicit int_type_checker(ErrorHandler eh) : ErrorHandler(eh) {} |
| |
| FMT_CONSTEXPR void on_dec() {} |
| FMT_CONSTEXPR void on_hex() {} |
| FMT_CONSTEXPR void on_bin() {} |
| FMT_CONSTEXPR void on_oct() {} |
| FMT_CONSTEXPR void on_num() {} |
| |
| FMT_CONSTEXPR void on_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[internal::to_unsigned(args.max_size())]; |
| if (args.is_packed()) { |
| for (int i = 0;; ++i) { |
| internal::type arg_type = args.type(i); |
| if (arg_type == internal::none_type) return; |
| if (arg_type == internal::named_arg_type) push_back(args.values_[i]); |
| } |
| } |
| for (int i = 0, n = args.max_size(); i < n; ++i) { |
| auto type = args.args_[i].type_; |
| if (type == internal::named_arg_type) push_back(args.args_[i].value_); |
| } |
| } |
| |
| // This template provides operations for formatting and writing data into a |
| // character range. |
| template <typename Range> class basic_writer { |
| public: |
| using char_type = typename Range::value_type; |
| using iterator = typename Range::iterator; |
| using format_specs = basic_format_specs<char_type>; |
| |
| 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); |
| } |
| |
| 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 F> |
| void write_int(int num_digits, string_view prefix, format_specs specs, F f) { |
| std::size_t size = prefix.size() + internal::to_unsigned(num_digits); |
| char_type fill = specs.fill[0]; |
| std::size_t padding = 0; |
| if (specs.align == align::numeric) { |
| auto unsiged_width = internal::to_unsigned(specs.width); |
| if (unsiged_width > size) { |
| padding = unsiged_width - size; |
| size = unsiged_width; |
| } |
| } else if (specs.precision > num_digits) { |
| size = prefix.size() + internal::to_unsigned(specs.precision); |
| padding = internal::to_unsigned(specs.precision - num_digits); |
| fill = static_cast<char_type>('0'); |
| } |
| if (specs.align == align::none) specs.align = align::right; |
| write_padded(specs, padded_int_writer<F>{size, prefix, fill, padding, f}); |
| } |
| |
| // Writes a decimal integer. |
| template <typename Int> void write_decimal(Int value) { |
| auto abs_value = static_cast<uint32_or_64_or_128_t<Int>>(value); |
| bool is_negative = internal::is_negative(value); |
| // Don't do -abs_value since it trips unsigned-integer-overflow sanitizer. |
| if (is_negative) abs_value = ~abs_value + 1; |
| 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 Specs> struct int_writer { |
| using unsigned_type = uint32_or_64_or_128_t<Int>; |
| |
| basic_writer<Range>& writer; |
| const Specs& specs; |
| unsigned_type abs_value; |
| char prefix[4]; |
| unsigned prefix_size; |
| |
| string_view get_prefix() const { return string_view(prefix, prefix_size); } |
| |
| int_writer(basic_writer<Range>& w, Int value, const Specs& s) |
| : writer(w), |
| specs(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 (specs.sign != sign::none && specs.sign != sign::minus) { |
| prefix[0] = specs.sign == sign::plus ? '+' : ' '; |
| ++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(), specs, |
| 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.specs.type != 'x'); |
| } |
| }; |
| |
| void on_hex() { |
| if (specs.alt) { |
| prefix[prefix_size++] = '0'; |
| prefix[prefix_size++] = specs.type; |
| } |
| int num_digits = internal::count_digits<4>(abs_value); |
| writer.write_int(num_digits, get_prefix(), specs, |
| 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 (specs.alt) { |
| prefix[prefix_size++] = '0'; |
| prefix[prefix_size++] = static_cast<char>(specs.type); |
| } |
| int num_digits = internal::count_digits<1>(abs_value); |
| writer.write_int(num_digits, get_prefix(), specs, |
| bin_writer<1>{abs_value, num_digits}); |
| } |
| |
| void on_oct() { |
| int num_digits = internal::count_digits<3>(abs_value); |
| if (specs.alt && specs.precision <= num_digits && abs_value != 0) { |
| // Octal prefix '0' is counted as a digit, so only add it if precision |
| // is not greater than the number of digits. |
| prefix[prefix_size++] = '0'; |
| } |
| writer.write_int(num_digits, get_prefix(), specs, |
| bin_writer<3>{abs_value, num_digits}); |
| } |
| |
| enum { sep_size = 1 }; |
| |
| struct num_writer { |
| unsigned_type abs_value; |
| int size; |
| const std::string& groups; |
| char_type sep; |
| |
| template <typename It> void operator()(It&& it) const { |
| basic_string_view<char_type> s(&sep, sep_size); |
| // Index of a decimal digit with the least significant digit having |
| // index 0. |
| unsigned digit_index = 0; |
| std::string::const_iterator group = groups.cbegin(); |
| it = internal::format_decimal<char_type>( |
| it, abs_value, size, |
| [this, s, &group, &digit_index](char_type*& buffer) { |
| if (*group <= 0 || ++digit_index % *group != 0 || |
| *group == max_value<char>()) |
| return; |
| if (group + 1 != groups.cend()) { |
| digit_index = 0; |
| ++group; |
| } |
| buffer -= s.size(); |
| std::uninitialized_copy(s.data(), s.data() + s.size(), |
| internal::make_checked(buffer, s.size())); |
| }); |
| } |
| }; |
| |
| void on_num() { |
| std::string groups = internal::grouping<char_type>(writer.locale_); |
| if (groups.empty()) return on_dec(); |
| auto sep = internal::thousands_sep<char_type>(writer.locale_); |
| if (!sep) return on_dec(); |
| int num_digits = internal::count_digits(abs_value); |
| int size = num_digits; |
| std::string::const_iterator group = groups.cbegin(); |
| while (group != groups.cend() && num_digits > *group && *group > 0 && |
| *group != max_value<char>()) { |
| size += sep_size; |
| num_digits -= *group; |
| ++group; |
| } |
| if (group == groups.cend()) |
| size += sep_size * ((num_digits - 1) / groups.back()); |
| writer.write_int(size, get_prefix(), specs, |
| num_writer{abs_value, size, groups, sep}); |
| } |
| |
| FMT_NORETURN void on_error() { |
| FMT_THROW(format_error("invalid type specifier")); |
| } |
| }; |
| |
| enum { inf_size = 3 }; // This is an enum to workaround a bug in MSVC. |
| |
| struct inf_or_nan_writer { |
| sign_t sign; |
| bool as_percentage; |
| const char* str; |
| |
| size_t size() const { |
| return static_cast<std::size_t>(inf_size + (sign ? 1 : 0) + |
| (as_percentage ? 1 : 0)); |
| } |
| size_t width() const { return size(); } |
| |
| template <typename It> void operator()(It&& it) const { |
| if (sign) *it++ = static_cast<char_type>(data::signs[sign]); |
| it = internal::copy_str<char_type>( |
| str, str + static_cast<std::size_t>(inf_size), it); |
| if (as_percentage) *it++ = static_cast<char_type>('%'); |
| } |
| }; |
| |
| struct double_writer { |
| sign_t sign; |
| internal::buffer<char>& buffer; |
| char* decimal_point_pos; |
| char_type decimal_point; |
| |
| 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>(data::signs[sign]); |
| auto begin = buffer.begin(); |
| if (decimal_point_pos) { |
| it = internal::copy_str<char_type>(begin, decimal_point_pos, it); |
| *it++ = decimal_point; |
| begin = decimal_point_pos + 1; |
| } |
| it = internal::copy_str<char_type>(begin, buffer.end(), it); |
| } |
| }; |
| |
| 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 UIntPtr> struct pointer_writer { |
| UIntPtr value; |
| int num_digits; |
| |
| size_t size() const { return to_unsigned(num_digits) + 2; } |
| size_t width() const { return size(); } |
| |
| template <typename It> void operator()(It&& it) const { |
| *it++ = static_cast<char_type>('0'); |
| *it++ = static_cast<char_type>('x'); |
| it = internal::format_uint<4, char_type>(it, value, num_digits); |
| } |
| }; |
| |
| 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_; } |
| |
| // 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 format_specs& specs, F&& f) { |
| // User-perceived width (in code points). |
| unsigned width = to_unsigned(specs.width); |
| 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 = specs.fill[0]; |
| std::size_t padding = width - num_code_points; |
| if (specs.align == align::right) { |
| it = std::fill_n(it, padding, fill); |
| f(it); |
| } else if (specs.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); |
| } |
| } |
| |
| 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); } |
| |
| #if FMT_USE_INT128 |
| void write(int128_t value) { write_decimal(value); } |
| void write(uint128_t value) { write_decimal(value); } |
| #endif |
| |
| // 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)); |
| } |
| |
| void write(float value, const format_specs& specs = format_specs()) { |
| write_fp(value, specs); |
| } |
| |
| void write(double value, const format_specs& specs = format_specs()) { |
| write_fp(value, 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, const format_specs& specs = format_specs()) { |
| write_fp(value, specs); |
| } |
| |
| // Formats a floating-point number (float, double, or long double). |
| template <typename T, bool USE_GRISU = fmt::internal::use_grisu<T>()> |
| void write_fp(T value, const format_specs& specs); |
| |
| /** Writes a character to the buffer. */ |
| void write(char value) { |
| auto&& it = reserve(1); |
| *it++ = value; |
| } |
| |
| template <typename Char, FMT_ENABLE_IF(std::is_same<Char, char_type>::value)> |
| void write(Char value) { |
| auto&& it = reserve(1); |
| *it++ = 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 format_specs& specs) { |
| write_padded(specs, str_writer<Char>{s, size}); |
| } |
| |
| template <typename Char> |
| void write(basic_string_view<Char> s, |
| const format_specs& specs = format_specs()) { |
| const Char* data = s.data(); |
| std::size_t size = s.size(); |
| if (specs.precision >= 0 && internal::to_unsigned(specs.precision) < size) |
| size = |
| internal::code_point_index(s, internal::to_unsigned(specs.precision)); |
| write(data, size, specs); |
| } |
| |
| template <typename UIntPtr> |
| void write_pointer(UIntPtr value, const format_specs* specs) { |
| int num_digits = internal::count_digits<4>(value); |
| auto pw = pointer_writer<UIntPtr>{value, num_digits}; |
| if (!specs) return pw(reserve(to_unsigned(num_digits) + 2)); |
| format_specs specs_copy = *specs; |
| if (specs_copy.align == align::none) specs_copy.align = align::right; |
| write_padded(specs_copy, pw); |
| } |
| }; |
| |
| using writer = basic_writer<buffer_range<char>>; |
| |
| template <typename T> struct is_integral : std::is_integral<T> {}; |
| template <> struct is_integral<int128_t> : std::true_type {}; |
| template <> struct is_integral<uint128_t> : std::true_type {}; |
| |
| template <typename Range, typename ErrorHandler = internal::error_handler> |
| class arg_formatter_base { |
| public: |
| using char_type = typename Range::value_type; |
| using iterator = typename Range::iterator; |
| using format_specs = basic_format_specs<char_type>; |
| |
| private: |
| using writer_type = basic_writer<Range>; |
| 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) { |
| writer_.write_pointer(internal::bit_cast<internal::uintptr_t>(p), specs_); |
| } |
| |
| protected: |
| writer_type& writer() { return writer_; } |
| FMT_DEPRECATED format_specs* spec() { return specs_; } |
| format_specs* specs() { 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")); |
| } else { |
| 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, FMT_ENABLE_IF(is_integral<T>::value)> |
| iterator operator()(T value) { |
| if (specs_) |
| writer_.write_int(value, *specs_); |
| else |
| writer_.write(value); |
| return out(); |
| } |
| |
| iterator operator()(char_type value) { |
| internal::handle_char_specs( |
| specs_, char_spec_handler(*this, static_cast<char_type>(value))); |
| return out(); |
| } |
| |
| iterator operator()(bool value) { |
| if (specs_ && specs_->type) return (*this)(value ? 1 : 0); |
| write(value != 0); |
| return out(); |
| } |
| |
| template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)> |
| iterator operator()(T value) { |
| writer_.write_fp(value, specs_ ? *specs_ : format_specs()); |
| return out(); |
| } |
| |
| struct char_spec_handler : ErrorHandler { |
| 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 int parse_nonnegative_int(const Char*& begin, const Char* end, |
| ErrorHandler&& eh) { |
| FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', ""); |
| if (*begin == '0') { |
| ++begin; |
| return 0; |
| } |
| unsigned value = 0; |
| // Convert to unsigned to prevent a warning. |
| constexpr unsigned max_int = max_value<int>(); |
| unsigned big = max_int / 10; |
| do { |
| // Check for overflow. |
| if (value > big) { |
| value = max_int + 1; |
| break; |
| } |
| value = value * 10 + unsigned(*begin - '0'); |
| ++begin; |
| } while (begin != end && '0' <= *begin && *begin <= '9'); |
| if (value > max_int) eh.on_error("number is too big"); |
| return static_cast<int>(value); |
| } |
| |
| template <typename Context> class custom_formatter { |
| private: |
| using char_type = typename Context::char_type; |
| |
| basic_format_parse_context<char_type>& parse_ctx_; |
| Context& ctx_; |
| |
| public: |
| explicit custom_formatter(basic_format_parse_context<char_type>& parse_ctx, |
| Context& ctx) |
| : parse_ctx_(parse_ctx), ctx_(ctx) {} |
| |
| bool operator()(typename basic_format_arg<Context>::handle h) const { |
| h.format(parse_ctx_, ctx_); |
| return true; |
| } |
| |
| template <typename T> bool operator()(T) const { return false; } |
| }; |
| |
| template <typename T> |
| using is_integer = |
| bool_constant<is_integral<T>::value && !std::is_same<T, bool>::value && |
| !std::is_same<T, char>::value && |
| !std::is_same<T, wchar_t>::value>; |
| |
| template <typename ErrorHandler> class width_checker { |
| public: |
| explicit FMT_CONSTEXPR width_checker(ErrorHandler& eh) : handler_(eh) {} |
| |
| template <typename T, FMT_ENABLE_IF(is_integer<T>::value)> |
| FMT_CONSTEXPR unsigned long long operator()(T value) { |
| if (is_negative(value)) handler_.on_error("negative width"); |
| return static_cast<unsigned long long>(value); |
| } |
| |
| template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)> |
| FMT_CONSTEXPR unsigned long long operator()(T) { |
| handler_.on_error("width is not integer"); |
| return 0; |
| } |
| |
| private: |
| ErrorHandler& handler_; |
| }; |
| |
| template <typename ErrorHandler> class precision_checker { |
| public: |
| explicit FMT_CONSTEXPR precision_checker(ErrorHandler& eh) : handler_(eh) {} |
| |
| template <typename T, FMT_ENABLE_IF(is_integer<T>::value)> |
| FMT_CONSTEXPR unsigned long long operator()(T value) { |
| if (is_negative(value)) handler_.on_error("negative precision"); |
| return static_cast<unsigned long long>(value); |
| } |
| |
| template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)> |
| FMT_CONSTEXPR unsigned long long operator()(T) { |
| handler_.on_error("precision is not integer"); |
| return 0; |
| } |
| |
| private: |
| ErrorHandler& handler_; |
| }; |
| |
| // A format specifier handler that sets fields in basic_format_specs. |
| template <typename Char> class specs_setter { |
| public: |
| explicit FMT_CONSTEXPR specs_setter(basic_format_specs<Char>& specs) |
| : specs_(specs) {} |
| |
| FMT_CONSTEXPR specs_setter(const specs_setter& other) |
| : specs_(other.specs_) {} |
| |
| FMT_CONSTEXPR void on_align(align_t align) { specs_.align = align; } |
| FMT_CONSTEXPR void on_fill(Char fill) { specs_.fill[0] = fill; } |
| FMT_CONSTEXPR void on_plus() { specs_.sign = sign::plus; } |
| FMT_CONSTEXPR void on_minus() { specs_.sign = sign::minus; } |
| FMT_CONSTEXPR void on_space() { specs_.sign = sign::space; } |
| FMT_CONSTEXPR void on_hash() { specs_.alt = true; } |
| |
| FMT_CONSTEXPR void on_zero() { |
| specs_.align = align::numeric; |
| specs_.fill[0] = Char('0'); |
| } |
| |
| FMT_CONSTEXPR void on_width(int width) { specs_.width = width; } |
| FMT_CONSTEXPR void on_precision(int precision) { |
| specs_.precision = precision; |
| } |
| FMT_CONSTEXPR void end_precision() {} |
| |
| FMT_CONSTEXPR void on_type(Char type) { |
| specs_.type = static_cast<char>(type); |
| } |
| |
| protected: |
| basic_format_specs<Char>& specs_; |
| }; |
| |
| template <typename ErrorHandler> class numeric_specs_checker { |
| public: |
| FMT_CONSTEXPR numeric_specs_checker(ErrorHandler& eh, internal::type arg_type) |
| : error_handler_(eh), arg_type_(arg_type) {} |
| |
| FMT_CONSTEXPR void require_numeric_argument() { |
| if (!is_arithmetic_type(arg_type_)) |
| error_handler_.on_error("format specifier requires numeric argument"); |
| } |
| |
| FMT_CONSTEXPR void check_sign() { |
| require_numeric_argument(); |
| if (is_integral_type(arg_type_) && arg_type_ != int_type && |
| arg_type_ != long_long_type && arg_type_ != internal::char_type) { |
| error_handler_.on_error("format specifier requires signed argument"); |
| } |
| } |
| |
| FMT_CONSTEXPR void check_precision() { |
| if (is_integral_type(arg_type_) || arg_type_ == internal::pointer_type) |
| error_handler_.on_error("precision not allowed for this argument type"); |
| } |
| |
| private: |
| ErrorHandler& error_handler_; |
| internal::type arg_type_; |
| }; |
| |
| // A format specifier handler that checks if specifiers are consistent with the |
| // argument type. |
| template <typename Handler> class specs_checker : public Handler { |
| public: |
| FMT_CONSTEXPR specs_checker(const Handler& handler, internal::type arg_type) |
| : Handler(handler), checker_(*this, arg_type) {} |
| |
| FMT_CONSTEXPR specs_checker(const specs_checker& other) |
| : Handler(other), checker_(*this, other.arg_type_) {} |
| |
| FMT_CONSTEXPR void on_align(align_t align) { |
| if (align == align::numeric) checker_.require_numeric_argument(); |
| Handler::on_align(align); |
| } |
| |
| FMT_CONSTEXPR void on_plus() { |
| checker_.check_sign(); |
| Handler::on_plus(); |
| } |
| |
| FMT_CONSTEXPR void on_minus() { |
| checker_.check_sign(); |
| Handler::on_minus(); |
| } |
| |
| FMT_CONSTEXPR void on_space() { |
| checker_.check_sign(); |
| Handler::on_space(); |
| } |
| |
| FMT_CONSTEXPR void on_hash() { |
| checker_.require_numeric_argument(); |
| Handler::on_hash(); |
| } |
| |
| FMT_CONSTEXPR void on_zero() { |
| checker_.require_numeric_argument(); |
| Handler::on_zero(); |
| } |
| |
| FMT_CONSTEXPR void end_precision() { checker_.check_precision(); } |
| |
| private: |
| numeric_specs_checker<Handler> checker_; |
| }; |
| |
| template <template <typename> class Handler, typename FormatArg, |
| typename ErrorHandler> |
| FMT_CONSTEXPR int get_dynamic_spec(FormatArg arg, ErrorHandler eh) { |
| unsigned long long value = visit_format_arg(Handler<ErrorHandler>(eh), arg); |
| if (value > to_unsigned(max_value<int>())) eh.on_error("number is too big"); |
| return static_cast<int>(value); |
| } |
| |
| struct auto_id {}; |
| |
| template <typename Context> |
| FMT_CONSTEXPR typename Context::format_arg get_arg(Context& ctx, int id) { |
| auto arg = ctx.arg(id); |
| if (!arg) ctx.on_error("argument index out of range"); |
| return arg; |
| } |
| |
| // The standard format specifier handler with checking. |
| template <typename ParseContext, typename Context> |
| class specs_handler : public specs_setter<typename Context::char_type> { |
| public: |
| using char_type = typename Context::char_type; |
| |
| FMT_CONSTEXPR specs_handler(basic_format_specs<char_type>& specs, |
| ParseContext& parse_ctx, Context& ctx) |
| : specs_setter<char_type>(specs), |
| parse_context_(parse_ctx), |
| context_(ctx) {} |
| |
| template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
| this->specs_.width = get_dynamic_spec<width_checker>( |
| get_arg(arg_id), context_.error_handler()); |
| } |
| |
| template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
| this->specs_.precision = get_dynamic_spec<precision_checker>( |
| get_arg(arg_id), context_.error_handler()); |
| } |
| |
| void on_error(const char* message) { context_.on_error(message); } |
| |
| private: |
| // This is only needed for compatibility with gcc 4.4. |
| using format_arg = typename Context::format_arg; |
| |
| FMT_CONSTEXPR format_arg get_arg(auto_id) { |
| return internal::get_arg(context_, parse_context_.next_arg_id()); |
| } |
| |
| FMT_CONSTEXPR format_arg get_arg(int arg_id) { |
| parse_context_.check_arg_id(arg_id); |
| return internal::get_arg(context_, arg_id); |
| } |
| |
| FMT_CONSTEXPR format_arg get_arg(basic_string_view<char_type> arg_id) { |
| parse_context_.check_arg_id(arg_id); |
| return context_.arg(arg_id); |
| } |
| |
| ParseContext& parse_context_; |
| Context& context_; |
| }; |
| |
| enum class arg_id_kind { none, index, name }; |
| |
| // An argument reference. |
| template <typename Char> struct arg_ref { |
| FMT_CONSTEXPR arg_ref() : kind(arg_id_kind::none), val() {} |
| FMT_CONSTEXPR explicit arg_ref(int index) |
| : kind(arg_id_kind::index), val(index) {} |
| FMT_CONSTEXPR explicit arg_ref(basic_string_view<Char> name) |
| : kind(arg_id_kind::name), val(name) {} |
| |
| FMT_CONSTEXPR arg_ref& operator=(int idx) { |
| kind = arg_id_kind::index; |
| val.index = idx; |
| return *this; |
| } |
| |
| arg_id_kind kind; |
| union value { |
| FMT_CONSTEXPR value(int id = 0) : index{id} {} |
| FMT_CONSTEXPR value(basic_string_view<Char> n) : name(n) {} |
| |
| int index; |
| basic_string_view<Char> name; |
| } val; |
| }; |
| |
| // Format specifiers with width and precision resolved at formatting rather |
| // than parsing time to allow re-using the same parsed specifiers with |
| // different sets of arguments (precompilation of format strings). |
| template <typename Char> |
| struct dynamic_format_specs : basic_format_specs<Char> { |
| arg_ref<Char> width_ref; |
| arg_ref<Char> precision_ref; |
| }; |
| |
| // Format spec handler that saves references to arguments representing dynamic |
| // width and precision to be resolved at formatting time. |
| template <typename ParseContext> |
| class dynamic_specs_handler |
| : public specs_setter<typename ParseContext::char_type> { |
| public: |
| using char_type = typename ParseContext::char_type; |
| |
| FMT_CONSTEXPR dynamic_specs_handler(dynamic_format_specs<char_type>& specs, |
| ParseContext& ctx) |
| : specs_setter<char_type>(specs), specs_(specs), context_(ctx) {} |
| |
| FMT_CONSTEXPR dynamic_specs_handler(const dynamic_specs_handler& other) |
| : specs_setter<char_type>(other), |
| specs_(other.specs_), |
| context_(other.context_) {} |
| |
| template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) { |
| specs_.width_ref = make_arg_ref(arg_id); |
| } |
| |
| template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) { |
| specs_.precision_ref = make_arg_ref(arg_id); |
| } |
| |
| FMT_CONSTEXPR void on_error(const char* message) { |
| context_.on_error(message); |
| } |
| |
| private: |
| using arg_ref_type = arg_ref<char_type>; |
| |
| FMT_CONSTEXPR arg_ref_type make_arg_ref(int arg_id) { |
| context_.check_arg_id(arg_id); |
| return arg_ref_type(arg_id); |
| } |
| |
| FMT_CONSTEXPR arg_ref_type make_arg_ref(auto_id) { |
| return arg_ref_type(context_.next_arg_id()); |
| } |
| |
| FMT_CONSTEXPR arg_ref_type make_arg_ref(basic_string_view<char_type> arg_id) { |
| context_.check_arg_id(arg_id); |
| basic_string_view<char_type> format_str( |
| context_.begin(), to_unsigned(context_.end() - context_.begin())); |
| return arg_ref_type(arg_id); |
| } |
| |
| dynamic_format_specs<char_type>& specs_; |
| ParseContext& context_; |
| }; |
| |
| template <typename Char, typename IDHandler> |
| FMT_CONSTEXPR const Char* parse_arg_id(const Char* begin, const Char* end, |
| IDHandler&& handler) { |
| FMT_ASSERT(begin != end, ""); |
| Char c = *begin; |
| if (c == '}' || c == ':') return handler(), begin; |
| if (c >= '0' && c <= '9') { |
| int 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()(int id) { handler.on_dynamic_width(id); } |
| FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
| handler.on_dynamic_width(id); |
| } |
| |
| FMT_CONSTEXPR void on_error(const char* message) { |
| handler.on_error(message); |
| } |
| |
| SpecHandler& handler; |
| }; |
| |
| // Adapts SpecHandler to IDHandler API for dynamic precision. |
| template <typename SpecHandler, typename Char> struct precision_adapter { |
| explicit FMT_CONSTEXPR precision_adapter(SpecHandler& h) : handler(h) {} |
| |
| FMT_CONSTEXPR void operator()() { handler.on_dynamic_precision(auto_id()); } |
| FMT_CONSTEXPR void operator()(int id) { handler.on_dynamic_precision(id); } |
| FMT_CONSTEXPR void operator()(basic_string_view<Char> id) { |
| handler.on_dynamic_precision(id); |
| } |
| |
| FMT_CONSTEXPR void on_error(const char* message) { |
| handler.on_error(message); |
| } |
| |
| SpecHandler& handler; |
| }; |
| |
| // Parses fill and alignment. |
| template <typename Char, typename Handler> |
| FMT_CONSTEXPR const Char* parse_align(const Char* begin, const Char* end, |
| Handler&& handler) { |
| FMT_ASSERT(begin != end, ""); |
| auto align = align::none; |
| 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; |
| #if FMT_NUMERIC_ALIGN |
| case '=': |
| align = align::numeric; |
| break; |
| #endif |
| case '^': |
| align = align::center; |
| break; |
| } |
| if (align != align::none) { |
| 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; |
| } |
| |
| template <typename Char, typename Handler> |
| FMT_CONSTEXPR const Char* parse_precision(const Char* begin, const Char* end, |
| Handler&& handler) { |
| ++begin; |
| auto c = begin != end ? *begin : Char(); |
| if ('0' <= c && c <= '9') { |
| handler.on_precision(parse_nonnegative_int(begin, end, handler)); |
| } else if (c == '{') { |
| ++begin; |
| if (begin != end) { |
| begin = |
| parse_arg_id(begin, end, precision_adapter<Handler, Char>(handler)); |
| } |
| if (begin == end || *begin++ != '}') |
| return handler.on_error("invalid format string"), begin; |
| } else { |
| return handler.on_error("missing precision specifier"), begin; |
| } |
| handler.end_precision(); |
| return begin; |
| } |
| |
| // Parses standard format specifiers and sends notifications about parsed |
| // components to handler. |
| template <typename Char, typename SpecHandler> |
| FMT_CONSTEXPR const Char* parse_format_specs(const Char* begin, const Char* end, |
| SpecHandler&& handler) { |
| if (begin == end || *begin == '}') return begin; |
| |
| begin = parse_align(begin, end, handler); |
| if (begin == end) return begin; |
| |
| // Parse sign. |
| switch (static_cast<char>(*begin)) { |
| case '+': |
| handler.on_plus(); |
| ++begin; |
| break; |
| case '-': |
| handler.on_minus(); |
| ++begin; |
| break; |
| case ' ': |
| handler.on_space(); |
| ++begin; |
| break; |
| } |
| if (begin == end) return begin; |
| |
| if (*begin == '#') { |
| handler.on_hash(); |
| if (++begin == end) return begin; |
| } |
| |
| // Parse zero flag. |
| if (*begin == '0') { |
| handler.on_zero(); |
| if (++begin == end) return begin; |
| } |
| |
| begin = parse_width(begin, end, handler); |
| if (begin == end) return begin; |
| |
| // Parse precision. |
| if (*begin == '.') { |
| begin = parse_precision(begin, end, handler); |
| } |
| |
| // Parse type. |
| if (begin != end && *begin != '}') handler.on_type(*begin++); |
| return begin; |
| } |
| |
| // Return the result via the out param to workaround gcc bug 77539. |
| template <bool IS_CONSTEXPR, typename T, typename Ptr = const T*> |
| FMT_CONSTEXPR bool find(Ptr first, Ptr last, T value, Ptr& out) { |
| for (out = first; out != last; ++out) { |
| if (*out == value) return true; |
| } |
| return false; |
| } |
| |
| template <> |
| inline bool find<false, char>(const char* first, const char* last, char value, |
| const char*& out) { |
| out = static_cast<const char*>( |
| std::memchr(first, value, internal::to_unsigned(last - first))); |
| return out != nullptr; |
| } |
| |
| template <typename Handler, typename Char> struct id_adapter { |
| FMT_CONSTEXPR void operator()() { handler.on_arg_id(); } |
| FMT_CONSTEXPR void operator()(int 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 pfs_writer { |
| FMT_CONSTEXPR void operator()(const Char* begin, const Char* end) { |
| if (begin == end) return; |
| for (;;) { |
| const Char* p = nullptr; |
| if (!find<IS_CONSTEXPR>(begin, end, '}', p)) |
| return handler_.on_text(begin, end); |
| ++p; |
| if (p == end || *p != '}') |
| return handler_.on_error("unmatched '}' in format string"); |
| handler_.on_text(begin, p); |
| begin = p + 1; |
| } |
| } |
| Handler& handler_; |
| } write{handler}; |
| 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) { |
| using char_type = typename ParseContext::char_type; |
| using context = buffer_context<char_type>; |
| using mapped_type = |
| conditional_t<internal::mapped_type_constant<T, context>::value != |
| internal::custom_type, |
| decltype(arg_mapper<context>().map(std::declval<T>())), T>; |
| auto f = conditional_t<has_formatter<mapped_type, context>::value, |
| formatter<mapped_type, char_type>, |
| internal::fallback_formatter<T, char_type>>(); |
| 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_(max_value<unsigned>()), |
| 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(int id) { |
| arg_id_ = id; |
| context_.check_arg_id(id); |
| check_arg_id(); |
| } |
| FMT_CONSTEXPR void on_arg_id(basic_string_view<Char>) { |
| on_error("compile-time checks don't support named arguments"); |
| } |
| |
| FMT_CONSTEXPR void on_replacement_field(const Char*) {} |
| |
| FMT_CONSTEXPR const Char* on_format_specs(const Char* begin, const Char*) { |
| advance_to(context_, 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: |
| using parse_context_type = basic_format_parse_context<Char, ErrorHandler>; |
| 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. |
| using parse_func = const Char* (*)(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, |
| enable_if_t<(is_compile_string<S>::value), int>> |
| void check_format_string(S format_str) { |
| FMT_CONSTEXPR_DECL bool invalid_format = |
| internal::do_check_format_string<typename S::char_type, |
| internal::error_handler, Args...>( |
| to_string_view(format_str)); |
| (void)invalid_format; |
| } |
| |
| template <template <typename> class Handler, typename Context> |
| void handle_dynamic_spec(int& value, arg_ref<typename Context::char_type> ref, |
| Context& ctx) { |
| switch (ref.kind) { |
| case arg_id_kind::none: |
| break; |
| case arg_id_kind::index: |
| value = internal::get_dynamic_spec<Handler>(ctx.arg(ref.val.index), |
| ctx.error_handler()); |
| break; |
| case arg_id_kind::name: |
| value = internal::get_dynamic_spec<Handler>(ctx.arg(ref.val.name), |
| ctx.error_handler()); |
| break; |
| } |
| } |
| } // namespace internal |
| |
| template <typename Range> |
| using basic_writer FMT_DEPRECATED_ALIAS = internal::basic_writer<Range>; |
| using writer FMT_DEPRECATED_ALIAS = internal::writer; |
| using wwriter FMT_DEPRECATED_ALIAS = |
| internal::basic_writer<buffer_range<wchar_t>>; |
| |
| /** The default argument formatter. */ |
| template <typename Range> |
| class arg_formatter : public internal::arg_formatter_base<Range> { |
| private: |
| using char_type = typename Range::value_type; |
| using base = internal::arg_formatter_base<Range>; |
| using context_type = basic_format_context<typename base::iterator, char_type>; |
| |
| context_type& ctx_; |
| basic_format_parse_context<char_type>* parse_ctx_; |
| |
| public: |
| using range = Range; |
| using iterator = typename base::iterator; |
| using format_specs = typename base::format_specs; |
| |
| /** |
| \rst |
| Constructs an argument formatter object. |
| *ctx* is a reference to the formatting context, |
| *specs* contains format specifier information for standard argument types. |
| \endrst |
| */ |
| explicit arg_formatter( |
| context_type& ctx, |
| basic_format_parse_context<char_type>* parse_ctx = nullptr, |
| format_specs* specs = nullptr) |
| : base(Range(ctx.out()), specs, ctx.locale()), |
| ctx_(ctx), |
| parse_ctx_(parse_ctx) {} |
| |
| using base::operator(); |
| |
| /** Formats an argument of a user-defined type. */ |
| iterator operator()(typename basic_format_arg<context_type>::handle handle) { |
| handle.format(*parse_ctx_, ctx_); |
| return ctx_.out(); |
| } |
| }; |
| |
| /** |
| An error returned by an operating system or a language runtime, |
| for example a file opening error. |
| */ |
| class FMT_API system_error : public std::runtime_error { |
| private: |
| void init(int err_code, string_view format_str, format_args args); |
| |
| protected: |
| int error_code_; |
| |
| system_error() : std::runtime_error(""), error_code_(0) {} |
| |
| public: |
| /** |
| \rst |
| Constructs a :class:`fmt::system_error` object with a description |
| formatted with `fmt::format_system_error`. *message* and additional |
| arguments passed into the constructor are formatted similarly to |
| `fmt::format`. |
| |
| **Example**:: |
| |
| // This throws a system_error with the description |
| // cannot open file 'madeup': No such file or directory |
| // or similar (system message may vary). |
| const char *filename = "madeup"; |
| std::FILE *file = std::fopen(filename, "r"); |
| if (!file) |
| throw fmt::system_error(errno, "cannot open file '{}'", filename); |
| \endrst |
| */ |
| template <typename... Args> |
| system_error(int error_code, string_view message, const Args&... args) |
| : std::runtime_error("") { |
| init(error_code, message, make_format_args(args...)); |
| } |
| system_error(const system_error&) = default; |
| system_error& operator=(const system_error&) = default; |
| system_error(system_error&&) = default; |
| system_error& operator=(system_error&&) = default; |
| ~system_error() FMT_NOEXCEPT FMT_OVERRIDE; |
| |
| int error_code() const { return error_code_; } |
| }; |
| |
| /** |
| \rst |
| Formats an error returned by an operating system or a language runtime, |
| for example a file opening error, and writes it to *out* in the following |
| form: |
| |
| .. parsed-literal:: |
| *<message>*: *<system-message>* |
| |
| where *<message>* is the passed message and *<system-message>* is |
| the system message corresponding to the error code. |
| *error_code* is a system error code as given by ``errno``. |
| If *error_code* is not a valid error code such as -1, the system message |
| may look like "Unknown error -1" and is platform-dependent. |
| \endrst |
| */ |
| FMT_API void format_system_error(internal::buffer<char>& out, int error_code, |
| fmt::string_view message) FMT_NOEXCEPT; |
| |
| template <typename Range> |
| template <typename T, bool USE_GRISU> |
| void internal::basic_writer<Range>::write_fp(T value, |
| const format_specs& specs) { |
| auto sign = specs.sign; |
| // Use signbit instead of value < 0 since the latter is always false for NaN. |
| if (std::signbit(value)) { |
| sign = sign::minus; |
| value = -value; |
| } else if (sign == sign::minus) { |
| sign = sign::none; |
| } |
| |
| float_spec fspec = parse_float_type_spec(specs.type); |
| if (!std::isfinite(value)) { |
| const char* str = std::isinf(value) ? (fspec.upper ? "INF" : "inf") |
| : (fspec.upper ? "NAN" : "nan"); |
| return write_padded(specs, inf_or_nan_writer{sign, fspec.percent, str}); |
| } |
| |
| if (fspec.percent) value *= 100; |
| |
| memory_buffer buffer; |
| int exp = 0; |
| int precision = specs.precision >= 0 || !specs.type ? specs.precision : 6; |
| unsigned options = 0; |
| if (fspec.format == float_format::fixed) options |= grisu_options::fixed; |
| if (const_check(sizeof(value) == sizeof(float))) |
| options |= grisu_options::binary32; |
| bool use_grisu = |
| USE_GRISU && |
| (specs.type != 'a' && specs.type != 'A' && specs.type != 'e' && |
| specs.type != 'E') && |
| grisu_format(static_cast<double>(value), buffer, precision, options, exp); |
| char* decimal_point_pos = nullptr; |
| if (!use_grisu) decimal_point_pos = sprintf_format(value, buffer, specs); |
| |
| if (fspec.percent) { |
| buffer.push_back('%'); |
| --exp; // Adjust decimal place position. |
| } |
| format_specs as = specs; |
| if (specs.align == align::numeric) { |
| if (sign) { |
| auto&& it = reserve(1); |
| *it++ = static_cast<char_type>(data::signs[sign]); |
| sign = sign::none; |
| if (as.width) --as.width; |
| } |
| as.align = align::right; |
| } else if (specs.align == align::none) { |
| as.align = align::right; |
| } |
| char_type decimal_point = fspec.locale |
| ? internal::decimal_point<char_type>(locale_) |
| : static_cast<char_type>('.'); |
| if (use_grisu) { |
| auto params = gen_digits_params(); |
| params.sign = sign; |
| params.format = fspec.format; |
| params.num_digits = precision; |
| params.trailing_zeros = |
| (precision != 0 && |
| (fspec.format == float_format::fixed || !specs.type)) || |
| specs.alt; |
| int num_digits = static_cast<int>(buffer.size()); |
| write_padded(as, grisu_writer<char_type>(buffer.data(), num_digits, exp, |
| params, decimal_point)); |
| } else { |
| write_padded(as, |
| double_writer{sign, buffer, decimal_point_pos, decimal_point}); |
| } |
| } |
| |
| // 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. |
| auto 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; |
| } |
| auto 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) { |
| auto 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()); } |
| }; |
| |
| // A formatter specialization for the core types corresponding to internal::type |
| // constants. |
| template <typename T, typename Char> |
| struct formatter<T, Char, |
| enable_if_t<internal::type_constant<T, Char>::value != |
| internal::custom_type>> { |
| FMT_CONSTEXPR formatter() = default; |
| |
| // Parses format specifiers stopping either at the end of the range or at the |
| // terminating '}'. |
| template <typename ParseContext> |
| FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| using handler_type = internal::dynamic_specs_handler<ParseContext>; |
| auto type = internal::type_constant<T, Char>::value; |
| internal::specs_checker<handler_type> handler(handler_type(specs_, ctx), |
| type); |
| auto it = parse_format_specs(ctx.begin(), ctx.end(), handler); |
| auto eh = ctx.error_handler(); |
| switch (type) { |
| case 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::int128_type: |
| case internal::uint128_type: |
| case internal::bool_type: |
| handle_int_type_spec(specs_.type, |
| internal::int_type_checker<decltype(eh)>(eh)); |
| break; |
| case internal::char_type: |
| handle_char_specs( |
| &specs_, internal::char_specs_checker<decltype(eh)>(specs_.type, eh)); |
| break; |
| case internal::float_type: |
| case internal::double_type: |
| case internal::long_double_type: |
| internal::parse_float_type_spec(specs_.type, eh); |
| break; |
| case internal::cstring_type: |
| internal::handle_cstring_type_spec( |
| specs_.type, internal::cstring_type_checker<decltype(eh)>(eh)); |
| break; |
| case internal::string_type: |
| internal::check_string_type_spec(specs_.type, eh); |
| break; |
| case internal::pointer_type: |
| internal::check_pointer_type_spec(specs_.type, 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); |
| using range_type = |
| internal::output_range<typename FormatContext::iterator, |
| typename FormatContext::char_type>; |
| return visit_format_arg(arg_formatter<range_type>(ctx, nullptr, &specs_), |
| internal::make_arg<FormatContext>(val)); |
| } |
| |
| private: |
| internal::dynamic_format_specs<Char> specs_; |
| }; |
| |
| #define FMT_FORMAT_AS(Type, Base) \ |
| template <typename Char> \ |
| struct formatter<Type, Char> : formatter<Base, Char> { \ |
| template <typename FormatContext> \ |
| auto format(const Type& val, FormatContext& ctx) -> decltype(ctx.out()) { \ |
| return formatter<Base, Char>::format(val, ctx); \ |
| } \ |
| } |
| |
| FMT_FORMAT_AS(signed char, int); |
| FMT_FORMAT_AS(unsigned char, unsigned); |
| FMT_FORMAT_AS(short, int); |
| FMT_FORMAT_AS(unsigned short, unsigned); |
| FMT_FORMAT_AS(long, long long); |
| FMT_FORMAT_AS(unsigned long, unsigned long long); |
| FMT_FORMAT_AS(Char*, const Char*); |
| FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>); |
| FMT_FORMAT_AS(std::nullptr_t, const void*); |
| FMT_FORMAT_AS(internal::std_string_view<Char>, basic_string_view<Char>); |
| |
| template <typename Char> |
| struct formatter<void*, Char> : formatter<const void*, Char> { |
| template <typename FormatContext> |
| auto format(void* val, FormatContext& ctx) -> decltype(ctx.out()) { |
| return formatter<const void*, Char>::format(val, ctx); |
| } |
| }; |
| |
| template <typename Char, size_t N> |
| struct formatter<Char[N], Char> : formatter<basic_string_view<Char>, Char> { |
| template <typename FormatContext> |
| auto format(const Char* val, FormatContext& ctx) -> decltype(ctx.out()) { |
| return formatter<basic_string_view<Char>, Char>::format(val, ctx); |
| } |
| }; |
| |
| // A formatter for types known only at run time such as variant alternatives. |
| // |
| // Usage: |
| // using variant = std::variant<int, std::string>; |
| // template <> |
| // struct formatter<variant>: dynamic_formatter<> { |
| // void format(buffer &buf, const variant &v, context &ctx) { |
| // visit([&](const auto &val) { format(buf, val, ctx); }, v); |
| // } |
| // }; |
| template <typename Char = char> class dynamic_formatter { |
| private: |
| struct null_handler : internal::error_handler { |
| void on_align(align_t) {} |
| void on_plus() {} |
| void on_minus() {} |
| void on_space() {} |
| void on_hash() {} |
| }; |
| |
| public: |
| template <typename ParseContext> |
| auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { |
| format_str_ = ctx.begin(); |
| // Checks are deferred to formatting time when the argument type is known. |
| 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::mapped_type_constant<T, FormatContext>::value); |
| checker.on_align(specs_.align); |
| switch (specs_.sign) { |
| case sign::none: |
| break; |
| case sign::plus: |
| checker.on_plus(); |
| break; |
| case sign::minus: |
| checker.on_minus(); |
| break; |
| case sign::space: |
| checker.on_space(); |
| break; |
| } |
| if (specs_.alt) checker.on_hash(); |
| if (specs_.precision >= 0) checker.end_precision(); |
| using range = internal::output_range<typename FormatContext::iterator, |
| typename FormatContext::char_type>; |
| visit_format_arg(arg_formatter<range>(ctx, nullptr, &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_; |
| const Char* format_str_; |
| }; |
| |
| template <typename Range, typename Char> |
| typename basic_format_context<Range, Char>::format_arg |
| basic_format_context<Range, Char>::arg(basic_string_view<char_type> name) { |
| map_.init(args_); |
| format_arg arg = map_.find(name); |
| if (arg.type() == internal::none_type) this->on_error("argument not found"); |
| return arg; |
| } |
| |
| template <typename Char, typename ErrorHandler> |
| FMT_CONSTEXPR void advance_to( |
| basic_format_parse_context<Char, ErrorHandler>& ctx, const Char* p) { |
| ctx.advance_to(ctx.begin() + (p - &*ctx.begin())); |
| } |
| |
| template <typename ArgFormatter, typename Char, typename Context> |
| struct format_handler : internal::error_handler { |
| using range = typename ArgFormatter::range; |
| |
| format_handler(range r, basic_string_view<Char> str, |
| basic_format_args<Context> format_args, |
| internal::locale_ref loc) |
| : parse_context(str), context(r.begin(), 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 get_arg(int id) { arg = internal::get_arg(context, id); } |
| |
| void on_arg_id() { get_arg(parse_context.next_arg_id()); } |
| void on_arg_id(int id) { |
| parse_context.check_arg_id(id); |
| get_arg(id); |
| } |
| void on_arg_id(basic_string_view<Char> id) { arg = context.arg(id); } |
| |
| void on_replacement_field(const Char* p) { |
| advance_to(parse_context, p); |
| context.advance_to( |
| visit_format_arg(ArgFormatter(context, &parse_context), arg)); |
| } |
| |
| const Char* on_format_specs(const Char* begin, const Char* end) { |
| advance_to(parse_context, begin); |
| internal::custom_formatter<Context> f(parse_context, context); |
| if (visit_format_arg(f, arg)) return parse_context.begin(); |
| basic_format_specs<Char> specs; |
| using internal::specs_handler; |
| using parse_context_t = basic_format_parse_context<Char>; |
| internal::specs_checker<specs_handler<parse_context_t, Context>> handler( |
| specs_handler<parse_context_t, Context>(specs, parse_context, context), |
| arg.type()); |
| begin = parse_format_specs(begin, end, handler); |
| if (begin == end || *begin != '}') on_error("missing '}' in format string"); |
| advance_to(parse_context, begin); |
| context.advance_to( |
| visit_format_arg(ArgFormatter(context, &parse_context, &specs), arg)); |
| return begin; |
| } |
| |
| basic_format_parse_context<Char> parse_context; |
| 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 T> inline const void* ptr(const std::unique_ptr<T>& p) { |
| return p.get(); |
| } |
| template <typename T> inline const void* ptr(const std::shared_ptr<T>& p) { |
| return p.get(); |
| } |
| |
| template <typename It, typename Char> struct arg_join : internal::view { |
| It begin; |
| It end; |
| basic_string_view<Char> sep; |
| |
| arg_join(It b, It e, basic_string_view<Char> s) : begin(b), end(e), sep(s) {} |
| }; |
| |
| 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()) { |
| using base = formatter<typename std::iterator_traits<It>::value_type, Char>; |
| auto it = value.begin; |
| auto out = ctx.out(); |
| if (it != value.end) { |
| out = base::format(*it++, ctx); |
| while (it != value.end) { |
| out = std::copy(value.sep.begin(), value.sep.end(), out); |
| ctx.advance_to(out); |
| out = base::format(*it++, ctx); |
| } |
| } |
| return out; |
| } |
| }; |
| |
| /** |
| Returns an object that formats the iterator range `[begin, end)` with elements |
| separated by `sep`. |
| */ |
| template <typename It> |
| arg_join<It, char> join(It begin, It end, string_view sep) { |
| return {begin, end, sep}; |
| } |
| |
| template <typename It> |
| arg_join<It, wchar_t> join(It begin, It end, wstring_view sep) { |
| return {begin, end, sep}; |
| } |
| |
| /** |
| \rst |
| Returns an object that formats `range` with elements separated by `sep`. |
| |
| **Example**:: |
| |
| std::vector<int> v = {1, 2, 3}; |
| fmt::print("{}", fmt::join(v, ", ")); |
| // Output: "1, 2, 3" |
| \endrst |
| */ |
| template <typename Range> |
| arg_join<internal::iterator_t<const Range>, char> join(const Range& range, |
| string_view sep) { |
| return join(std::begin(range), std::end(range), sep); |
| } |
| |
| template <typename Range> |
| arg_join<internal::iterator_t<const Range>, wchar_t> join(const Range& range, |
| wstring_view sep) { |
| return join(std::begin(range), std::end(range), sep); |
| } |
| |
| /** |
| \rst |
| Converts *value* to ``std::string`` using the default format for type *T*. |
| 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> inline std::string to_string(const T& value) { |
| return format("{}", value); |
| } |
| |
| /** |
| Converts *value* to ``std::wstring`` using the default format for type *T*. |
| */ |
| template <typename T> inline std::wstring to_wstring(const T& value) { |
| return format(L"{}", value); |
| } |
| |
| template <typename Char, 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>::iterator internal::vformat_to( |
| internal::buffer<Char>& buf, basic_string_view<Char> format_str, |
| basic_format_args<buffer_context<Char>> args) { |
| using range = buffer_range<Char>; |
| return vformat_to<arg_formatter<range>>(buf, to_string_view(format_str), |
| args); |
| } |
| |
| template <typename S, typename Char = char_t<S>, |
| FMT_ENABLE_IF(internal::is_string<S>::value)> |
| inline typename buffer_context<Char>::iterator vformat_to( |
| internal::buffer<Char>& buf, const S& format_str, |
| basic_format_args<buffer_context<Char>> 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 = enable_if_t<internal::is_string<S>::value, char_t<S>>> |
| inline typename buffer_context<Char>::iterator format_to( |
| basic_memory_buffer<Char, SIZE>& buf, const S& format_str, Args&&... args) { |
| internal::check_format_string<Args...>(format_str); |
| using context = buffer_context<Char>; |
| return internal::vformat_to(buf, to_string_view(format_str), |
| {make_format_args<context>(args...)}); |
| } |
| |
| template <typename OutputIt, typename Char = char> |
| using format_context_t = basic_format_context<OutputIt, Char>; |
| |
| template <typename OutputIt, typename Char = char> |
| using format_args_t = basic_format_args<format_context_t<OutputIt, Char>>; |
| |
| template <typename S, typename OutputIt, typename... Args, |
| FMT_ENABLE_IF( |
| internal::is_output_iterator<OutputIt>::value && |
| !internal::is_contiguous_back_insert_iterator<OutputIt>::value)> |
| inline OutputIt vformat_to(OutputIt out, const S& format_str, |
| format_args_t<OutputIt, char_t<S>> args) { |
| using range = internal::output_range<OutputIt, char_t<S>>; |
| 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, |
| FMT_ENABLE_IF( |
| internal::is_output_iterator<OutputIt>::value && |
| !internal::is_contiguous_back_insert_iterator<OutputIt>::value && |
| internal::is_string<S>::value)> |
| inline OutputIt format_to(OutputIt out, const S& format_str, Args&&... args) { |
| internal::check_format_string<Args...>(format_str); |
| using context = format_context_t<OutputIt, char_t<S>>; |
| return vformat_to(out, to_string_view(format_str), |
| {make_format_args<context>(args...)}); |
| } |
| |
| 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> |
| using format_to_n_context = |
| format_context_t<fmt::internal::truncating_iterator<OutputIt>, Char>; |
| |
| template <typename OutputIt, typename Char = typename OutputIt::value_type> |
| using format_to_n_args = basic_format_args<format_to_n_context<OutputIt, Char>>; |
| |
| template <typename OutputIt, typename Char, typename... Args> |
| inline format_arg_store<format_to_n_context<OutputIt, Char>, Args...> |
| make_format_to_n_args(const Args&... args) { |
| return format_arg_store<format_to_n_context<OutputIt, Char>, Args...>( |
| args...); |
| } |
| |
| template <typename OutputIt, typename Char, typename... Args, |
| FMT_ENABLE_IF(internal::is_output_iterator<OutputIt>::value)> |
| inline format_to_n_result<OutputIt> vformat_to_n( |
| OutputIt out, std::size_t n, basic_string_view<Char> format_str, |
| format_to_n_args<OutputIt, Char> args) { |
| auto it = vformat_to(internal::truncating_iterator<OutputIt>(out, n), |
| format_str, args); |
| return {it.base(), it.count()}; |
| } |
| |
| /** |
| \rst |
| Formats arguments, writes up to ``n`` characters of the result to the output |
| iterator ``out`` and returns the total output size and the iterator past the |
| end of the output range. |
| \endrst |
| */ |
| template <typename OutputIt, typename S, typename... Args, |
| FMT_ENABLE_IF(internal::is_string<S>::value&& |
| internal::is_output_iterator<OutputIt>::value)> |
| inline 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); |
| using context = format_to_n_context<OutputIt, char_t<S>>; |
| return vformat_to_n(out, n, to_string_view(format_str), |
| {make_format_args<context>(args...)}); |
| } |
| |
| template <typename Char> |
| inline std::basic_string<Char> internal::vformat( |
| basic_string_view<Char> format_str, |
| basic_format_args<buffer_context<Char>> 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(), format_str, args...); |
| return it.count(); |
| } |
| |
| #if FMT_USE_USER_DEFINED_LITERALS |
| namespace internal { |
| |
| # if FMT_USE_UDL_TEMPLATE |
| template <typename Char, Char... CHARS> class udl_formatter { |
| public: |
| template <typename... Args> |
| std::basic_string<Char> operator()(Args&&... args) const { |
| FMT_CONSTEXPR_DECL Char s[] = {CHARS..., '\0'}; |
| FMT_CONSTEXPR_DECL bool invalid_format = |
| do_check_format_string<Char, error_handler, remove_cvref_t<Args>...>( |
| basic_string_view<Char>(s, sizeof...(CHARS))); |
| (void)invalid_format; |
| return format(s, std::forward<Args>(args)...); |
| } |
| }; |
| # else |
| template <typename Char> struct udl_formatter { |
| basic_string_view<Char> str; |
| |
| template <typename... Args> |
| std::basic_string<Char> operator()(Args&&... args) const { |
| return format(str, std::forward<Args>(args)...); |
| } |
| }; |
| # endif // FMT_USE_UDL_TEMPLATE |
| |
| template <typename Char> struct udl_arg { |
| basic_string_view<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_USE_UDL_TEMPLATE |
| # pragma GCC diagnostic push |
| # if FMT_CLANG_VERSION |
| # pragma GCC diagnostic ignored "-Wgnu-string-literal-operator-template" |
| # endif |
| template <typename Char, Char... CHARS> |
| FMT_CONSTEXPR internal::udl_formatter<Char, CHARS...> operator""_format() { |
| return {}; |
| } |
| # pragma GCC diagnostic pop |
| # else |
| /** |
| \rst |
| User-defined literal equivalent of :func:`fmt::format`. |
| |
| **Example**:: |
| |
| using namespace fmt::literals; |
| std::string message = "The answer is {}"_format(42); |
| \endrst |
| */ |
| FMT_CONSTEXPR internal::udl_formatter<char> operator"" _format(const char* s, |
| std::size_t n) { |
| return {{s, n}}; |
| } |
| FMT_CONSTEXPR internal::udl_formatter<wchar_t> operator"" _format( |
| const wchar_t* s, std::size_t n) { |
| return {{s, n}}; |
| } |
| # endif // FMT_USE_UDL_TEMPLATE |
| |
| /** |
| \rst |
| User-defined literal equivalent of :func:`fmt::arg`. |
| |
| **Example**:: |
| |
| using namespace fmt::literals; |
| fmt::print("Elapsed time: {s:.2f} seconds", "s"_a=1.23); |
| \endrst |
| */ |
| FMT_CONSTEXPR internal::udl_arg<char> operator"" _a(const char* s, |
| std::size_t n) { |
| return {{s, n}}; |
| } |
| FMT_CONSTEXPR internal::udl_arg<wchar_t> operator"" _a(const wchar_t* s, |
| std::size_t n) { |
| return {{s, n}}; |
| } |
| } // namespace literals |
| #endif // FMT_USE_USER_DEFINED_LITERALS |
| FMT_END_NAMESPACE |
| |
| /** |
| \rst |
| Constructs a compile-time format string. |
| |
| **Example**:: |
| |
| // A compile-time error because 'd' is an invalid specifier for strings. |
| std::string s = format(FMT_STRING("{:d}"), "foo"); |
| \endrst |
| */ |
| #define FMT_STRING(s) \ |
| [] { \ |
| struct str : fmt::compile_string { \ |
| using char_type = typename std::remove_cv<std::remove_pointer< \ |
| typename std::decay<decltype(s)>::type>::type>::type; \ |
| FMT_CONSTEXPR operator fmt::basic_string_view<char_type>() const { \ |
| return {s, sizeof(s) / sizeof(char_type) - 1}; \ |
| } \ |
| } result; \ |
| /* Suppress Qt Creator warning about unused operator. */ \ |
| (void)static_cast<fmt::basic_string_view<typename str::char_type>>( \ |
| result); \ |
| return result; \ |
| }() |
| |
| #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 |
| |
| #endif // FMT_FORMAT_H_ |