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2737 lines (2349 loc) · 80.6 KB
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/*
Formatting library for C++
Copyright (c) 2012 - 2015, Victor Zverovich
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FMT_FORMAT_H_
#define FMT_FORMAT_H_
#include <stdint.h>
#include <cassert>
#include <cmath>
#include <cstddef> // for std::ptrdiff_t
#include <cstdio>
#include <algorithm>
#include <limits>
#include <stdexcept>
#include <string>
#include <sstream>
#if _SECURE_SCL
# include <iterator>
#endif
#ifdef _MSC_VER
# include <intrin.h> // _BitScanReverse, _BitScanReverse64
namespace fmt {
namespace internal {
# pragma intrinsic(_BitScanReverse)
inline uint32_t clz(uint32_t x) {
unsigned long r = 0;
_BitScanReverse(&r, x);
return 31 - r;
}
# define FMT_BUILTIN_CLZ(n) fmt::internal::clz(n)
# ifdef _WIN64
# 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
return 63 - r;
}
# define FMT_BUILTIN_CLZLL(n) fmt::internal::clzll(n)
}
}
#endif
#ifdef __GNUC__
# define FMT_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
# define FMT_GCC_EXTENSION __extension__
# if FMT_GCC_VERSION >= 406
# pragma GCC diagnostic push
// Disable the warning about "long long" which is sometimes reported even
// when using __extension__.
# pragma GCC diagnostic ignored "-Wlong-long"
// Disable the warning about declaration shadowing because it affects too
// many valid cases.
# pragma GCC diagnostic ignored "-Wshadow"
# endif
# if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__
# define FMT_HAS_GXX_CXX11 1
# endif
#else
# define FMT_GCC_EXTENSION
#endif
#ifdef __clang__
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wdocumentation"
#endif
#ifdef __GNUC_LIBSTD__
# define FMT_GNUC_LIBSTD_VERSION (__GNUC_LIBSTD__ * 100 + __GNUC_LIBSTD_MINOR__)
#endif
#ifdef __has_feature
# define FMT_HAS_FEATURE(x) __has_feature(x)
#else
# define FMT_HAS_FEATURE(x) 0
#endif
#ifdef __has_builtin
# define FMT_HAS_BUILTIN(x) __has_builtin(x)
#else
# define FMT_HAS_BUILTIN(x) 0
#endif
#ifdef __has_cpp_attribute
# define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
#else
# define FMT_HAS_CPP_ATTRIBUTE(x) 0
#endif
#ifndef FMT_USE_VARIADIC_TEMPLATES
// Variadic templates are available in GCC since version 4.4
// (http://gcc.gnu.org/projects/cxx0x.html) and in Visual C++
// since version 2013.
# define FMT_USE_VARIADIC_TEMPLATES \
(FMT_HAS_FEATURE(cxx_variadic_templates) || \
(FMT_GCC_VERSION >= 404 && FMT_HAS_GXX_CXX11) || _MSC_VER >= 1800)
#endif
#ifndef FMT_USE_RVALUE_REFERENCES
// Don't use rvalue references when compiling with clang and an old libstdc++
// as the latter doesn't provide std::move.
# if defined(FMT_GNUC_LIBSTD_VERSION) && FMT_GNUC_LIBSTD_VERSION <= 402
# define FMT_USE_RVALUE_REFERENCES 0
# else
# define FMT_USE_RVALUE_REFERENCES \
(FMT_HAS_FEATURE(cxx_rvalue_references) || \
(FMT_GCC_VERSION >= 403 && FMT_HAS_GXX_CXX11) || _MSC_VER >= 1600)
# endif
#endif
#if FMT_USE_RVALUE_REFERENCES
# include <utility> // for std::move
#endif
// Define FMT_USE_NOEXCEPT to make C++ Format use noexcept (C++11 feature).
#if FMT_USE_NOEXCEPT || FMT_HAS_FEATURE(cxx_noexcept) || \
(FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11)
# define FMT_NOEXCEPT noexcept
#else
# define FMT_NOEXCEPT throw()
#endif
// A macro to disallow the copy constructor and operator= functions
// This should be used in the private: declarations for a class
#if FMT_USE_DELETED_FUNCTIONS || FMT_HAS_FEATURE(cxx_deleted_functions) || \
(FMT_GCC_VERSION >= 404 && FMT_HAS_GXX_CXX11) || _MSC_VER >= 1800
# define FMT_DISALLOW_COPY_AND_ASSIGN(TypeName) \
TypeName(const TypeName&) = delete; \
TypeName& operator=(const TypeName&) = delete
#else
# define FMT_DISALLOW_COPY_AND_ASSIGN(TypeName) \
TypeName(const TypeName&); \
TypeName& operator=(const TypeName&)
#endif
namespace fmt {
// Fix the warning about long long on older versions of GCC
// that don't support the diagnostic pragma.
FMT_GCC_EXTENSION typedef long long LongLong;
FMT_GCC_EXTENSION typedef unsigned long long ULongLong;
#if FMT_USE_RVALUE_REFERENCES
using std::move;
#endif
template <typename Char>
class BasicWriter;
typedef BasicWriter<char> Writer;
typedef BasicWriter<wchar_t> WWriter;
template <typename Char>
class BasicFormatter;
template <typename Char, typename T>
void format(BasicFormatter<Char> &f, const Char *&format_str, const T &value);
/**
\rst
A string reference. It can be constructed from a C string or
``std::string``.
You can use one of the following typedefs for common character types:
+------------+-------------------------+
| Type | Definition |
+============+=========================+
| StringRef | BasicStringRef<char> |
+------------+-------------------------+
| WStringRef | BasicStringRef<wchar_t> |
+------------+-------------------------+
This class is most useful as a parameter type to allow passing
different types of strings to a function, for example::
template <typename... Args>
std::string format(StringRef format_str, const Args & ... args);
format("{}", 42);
format(std::string("{}"), 42);
\endrst
*/
template <typename Char>
class BasicStringRef {
private:
const Char *data_;
std::size_t size_;
public:
/**
Constructs a string reference object from a C string and a size.
*/
BasicStringRef(const Char *s, std::size_t size) : data_(s), size_(size) {}
/**
Constructs a string reference object from a C string computing
the size with ``std::char_traits<Char>::length``.
*/
BasicStringRef(const Char *s)
: data_(s), size_(std::char_traits<Char>::length(s)) {}
/**
Constructs a string reference from an `std::string` object.
*/
BasicStringRef(const std::basic_string<Char> &s)
: data_(s.c_str()), size_(s.size()) {}
/**
Converts a string reference to an `std::string` object.
*/
operator std::basic_string<Char>() const {
return std::basic_string<Char>(data_, size());
}
/**
Returns the pointer to a C string.
*/
const Char *c_str() const { return data_; }
/**
Returns the string size.
*/
std::size_t size() const { return size_; }
friend bool operator==(BasicStringRef lhs, BasicStringRef rhs) {
return lhs.data_ == rhs.data_;
}
friend bool operator!=(BasicStringRef lhs, BasicStringRef rhs) {
return lhs.data_ != rhs.data_;
}
};
typedef BasicStringRef<char> StringRef;
typedef BasicStringRef<wchar_t> WStringRef;
/**
A formatting error such as invalid format string.
*/
class FormatError : public std::runtime_error {
public:
explicit FormatError(StringRef message)
: std::runtime_error(message.c_str()) {}
};
namespace internal {
// The number of characters to store in the MemoryBuffer object itself
// to avoid dynamic memory allocation.
enum { INLINE_BUFFER_SIZE = 500 };
#if _SECURE_SCL
// Use checked iterator to avoid warnings on MSVC.
template <typename T>
inline stdext::checked_array_iterator<T*> make_ptr(T *ptr, std::size_t size) {
return stdext::checked_array_iterator<T*>(ptr, size);
}
#else
template <typename T>
inline T *make_ptr(T *ptr, std::size_t) { return ptr; }
#endif
} // namespace internal
/** A buffer supporting a subset of ``std::vector``'s operations. */
template <typename T>
class Buffer {
private:
FMT_DISALLOW_COPY_AND_ASSIGN(Buffer);
protected:
T *ptr_;
std::size_t size_;
std::size_t capacity_;
Buffer(T *ptr = 0, std::size_t capacity = 0)
: ptr_(ptr), size_(0), capacity_(capacity) {}
/**
Increases the buffer capacity to hold at least *size* elements updating
``ptr_`` and ``capacity_``.
*/
virtual void grow(std::size_t size) = 0;
public:
virtual ~Buffer() {}
/** Returns the size of this buffer. */
std::size_t size() const { return size_; }
/** Returns the capacity of this buffer. */
std::size_t capacity() const { return capacity_; }
/**
Resizes the buffer. If T is a POD type new elements may not be initialized.
*/
void resize(std::size_t new_size) {
if (new_size > capacity_)
grow(new_size);
size_ = new_size;
}
/** Reserves space to store at least *capacity* elements. */
void reserve(std::size_t capacity) {
if (capacity > capacity_)
grow(capacity);
}
void clear() FMT_NOEXCEPT { size_ = 0; }
void push_back(const T &value) {
if (size_ == capacity_)
grow(size_ + 1);
ptr_[size_++] = value;
}
/** Appends data to the end of the buffer. */
void append(const T *begin, const T *end);
T &operator[](std::size_t index) { return ptr_[index]; }
const T &operator[](std::size_t index) const { return ptr_[index]; }
};
template <typename T>
void Buffer<T>::append(const T *begin, const T *end) {
std::ptrdiff_t num_elements = end - begin;
if (size_ + num_elements > capacity_)
grow(size_ + num_elements);
std::copy(begin, end, internal::make_ptr(ptr_, capacity_) + size_);
size_ += num_elements;
}
namespace internal {
// A memory buffer for POD types with the first SIZE elements stored in
// the object itself.
template <typename T, std::size_t SIZE, typename Allocator = std::allocator<T> >
class MemoryBuffer : private Allocator, public Buffer<T> {
private:
T data_[SIZE];
// Free memory allocated by the buffer.
void free() {
if (this->ptr_ != data_) this->deallocate(this->ptr_, this->capacity_);
}
protected:
void grow(std::size_t size);
public:
explicit MemoryBuffer(const Allocator &alloc = Allocator())
: Allocator(alloc), Buffer<T>(data_, SIZE) {}
~MemoryBuffer() { free(); }
#if FMT_USE_RVALUE_REFERENCES
private:
// Move data from other to this buffer.
void move(MemoryBuffer &other) {
Allocator &this_alloc = *this, &other_alloc = other;
this_alloc = std::move(other_alloc);
this->size_ = other.size_;
this->capacity_ = other.capacity_;
if (other.ptr_ == other.data_) {
this->ptr_ = data_;
std::copy(other.data_,
other.data_ + this->size_, make_ptr(data_, this->capacity_));
} else {
this->ptr_ = other.ptr_;
// Set pointer to the inline array so that delete is not called
// when freeing.
other.ptr_ = other.data_;
}
}
public:
MemoryBuffer(MemoryBuffer &&other) {
move(other);
}
MemoryBuffer &operator=(MemoryBuffer &&other) {
assert(this != &other);
free();
move(other);
return *this;
}
#endif
// 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 MemoryBuffer<T, SIZE, Allocator>::grow(std::size_t size) {
std::size_t new_capacity =
(std::max)(size, this->capacity_ + this->capacity_ / 2);
T *new_ptr = this->allocate(new_capacity);
// The following code doesn't throw, so the raw pointer above doesn't leak.
std::copy(this->ptr_,
this->ptr_ + this->size_, make_ptr(new_ptr, new_capacity));
std::size_t old_capacity = this->capacity_;
T *old_ptr = this->ptr_;
this->capacity_ = new_capacity;
this->ptr_ = new_ptr;
// deallocate may throw (at least in principle), but it doesn't matter since
// the buffer already uses the new storage and will deallocate it in case
// of exception.
if (old_ptr != data_)
this->deallocate(old_ptr, old_capacity);
}
// A fixed-size buffer.
template <typename Char>
class FixedBuffer : public fmt::Buffer<Char> {
public:
FixedBuffer(Char *array, std::size_t size) : fmt::Buffer<Char>(array, size) {}
protected:
void grow(std::size_t size);
};
#ifndef _MSC_VER
// Portable version of signbit.
inline int getsign(double x) {
// When compiled in C++11 mode signbit is no longer a macro but a function
// defined in namespace std and the macro is undefined.
# ifdef signbit
return signbit(x);
# else
return std::signbit(x);
# endif
}
// Portable version of isinf.
# ifdef isinf
inline int isinfinity(double x) { return isinf(x); }
inline int isinfinity(long double x) { return isinf(x); }
# else
inline int isinfinity(double x) { return std::isinf(x); }
inline int isinfinity(long double x) { return std::isinf(x); }
# endif
#else
inline int getsign(double value) {
if (value < 0) return 1;
if (value == value) return 0;
int dec = 0, sign = 0;
char buffer[2]; // The buffer size must be >= 2 or _ecvt_s will fail.
_ecvt_s(buffer, sizeof(buffer), value, 0, &dec, &sign);
return sign;
}
inline int isinfinity(double x) { return !_finite(x); }
inline int isinfinity(long double x) { return !_finite(static_cast<double>(x)); }
#endif
template <typename Char>
class BasicCharTraits {
public:
#if _SECURE_SCL
typedef stdext::checked_array_iterator<Char*> CharPtr;
#else
typedef Char *CharPtr;
#endif
};
template <typename Char>
class CharTraits;
template <>
class CharTraits<char> : public BasicCharTraits<char> {
private:
// Conversion from wchar_t to char is not allowed.
static char convert(wchar_t);
public:
static char convert(char value) { return value; }
// Formats a floating-point number.
template <typename T>
static int format_float(char *buffer, std::size_t size,
const char *format, unsigned width, int precision, T value);
};
template <>
class CharTraits<wchar_t> : public BasicCharTraits<wchar_t> {
public:
static wchar_t convert(char value) { return value; }
static wchar_t convert(wchar_t value) { return value; }
template <typename T>
static int format_float(wchar_t *buffer, std::size_t size,
const wchar_t *format, unsigned width, int precision, T value);
};
// Checks if a number is negative - used to avoid warnings.
template <bool IsSigned>
struct SignChecker {
template <typename T>
static bool is_negative(T value) { return value < 0; }
};
template <>
struct SignChecker<false> {
template <typename T>
static bool is_negative(T) { return false; }
};
// 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>
inline bool is_negative(T value) {
return SignChecker<std::numeric_limits<T>::is_signed>::is_negative(value);
}
// Selects uint32_t if FitsIn32Bits is true, uint64_t otherwise.
template <bool FitsIn32Bits>
struct TypeSelector { typedef uint32_t Type; };
template <>
struct TypeSelector<false> { typedef uint64_t Type; };
template <typename T>
struct IntTraits {
// Smallest of uint32_t and uint64_t that is large enough to represent
// all values of T.
typedef typename
TypeSelector<std::numeric_limits<T>::digits <= 32>::Type MainType;
};
// MakeUnsigned<T>::Type gives an unsigned type corresponding to integer type T.
template <typename T>
struct MakeUnsigned { typedef T Type; };
#define FMT_SPECIALIZE_MAKE_UNSIGNED(T, U) \
template <> \
struct MakeUnsigned<T> { typedef U Type; }
FMT_SPECIALIZE_MAKE_UNSIGNED(char, unsigned char);
FMT_SPECIALIZE_MAKE_UNSIGNED(signed char, unsigned char);
FMT_SPECIALIZE_MAKE_UNSIGNED(short, unsigned short);
FMT_SPECIALIZE_MAKE_UNSIGNED(int, unsigned);
FMT_SPECIALIZE_MAKE_UNSIGNED(long, unsigned long);
FMT_SPECIALIZE_MAKE_UNSIGNED(LongLong, ULongLong);
void report_unknown_type(char code, const char *type);
// Static data is placed in this class template to allow header-only
// configuration.
template <typename T = void>
struct BasicData {
static const uint32_t POWERS_OF_10_32[];
static const uint64_t POWERS_OF_10_64[];
static const char DIGITS[];
};
typedef BasicData<> Data;
#if FMT_GCC_VERSION >= 400 || FMT_HAS_BUILTIN(__builtin_clz)
# define FMT_BUILTIN_CLZ(n) __builtin_clz(n)
#endif
#if FMT_GCC_VERSION >= 400 || FMT_HAS_BUILTIN(__builtin_clzll)
# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
#endif
#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 unsigned 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.
unsigned t = (64 - FMT_BUILTIN_CLZLL(n | 1)) * 1233 >> 12;
return t - (n < Data::POWERS_OF_10_64[t]) + 1;
}
#else
// Fallback version of count_digits used when __builtin_clz is not available.
inline unsigned count_digits(uint64_t n) {
unsigned 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
#ifdef FMT_BUILTIN_CLZ
// Optional version of count_digits for better performance on 32-bit platforms.
inline unsigned count_digits(uint32_t n) {
uint32_t t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12;
return t - (n < Data::POWERS_OF_10_32[t]) + 1;
}
#endif
// Formats a decimal unsigned integer value writing into buffer.
template <typename UInt, typename Char>
inline void format_decimal(Char *buffer, UInt value, unsigned num_digits) {
--num_digits;
while (value >= 100) {
// Integer division is slow so do it for a group of two digits instead
// of for every digit. The idea comes from the talk by Alexandrescu
// "Three Optimization Tips for C++". See speed-test for a comparison.
unsigned index = (value % 100) * 2;
value /= 100;
buffer[num_digits] = Data::DIGITS[index + 1];
buffer[num_digits - 1] = Data::DIGITS[index];
num_digits -= 2;
}
if (value < 10) {
*buffer = static_cast<char>('0' + value);
return;
}
unsigned index = static_cast<unsigned>(value * 2);
buffer[1] = Data::DIGITS[index + 1];
buffer[0] = Data::DIGITS[index];
}
#ifdef _WIN32
// A converter from UTF-8 to UTF-16.
// It is only provided for Windows since other systems support UTF-8 natively.
class UTF8ToUTF16 {
private:
MemoryBuffer<wchar_t, INLINE_BUFFER_SIZE> buffer_;
public:
explicit UTF8ToUTF16(StringRef s);
operator WStringRef() const { return WStringRef(&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 UTF16ToUTF8 {
private:
MemoryBuffer<char, INLINE_BUFFER_SIZE> buffer_;
public:
UTF16ToUTF8() {}
explicit UTF16ToUTF8(WStringRef s);
operator StringRef() const { return StringRef(&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.
int convert(WStringRef s);
};
#endif
void format_system_error(fmt::Writer &out, int error_code,
fmt::StringRef message) FMT_NOEXCEPT;
#ifdef _WIN32
void format_windows_error(fmt::Writer &out, int error_code,
fmt::StringRef message) FMT_NOEXCEPT;
#endif
// Computes max(N, 1) at compile time. It is used to avoid errors about
// allocating an array of 0 size.
template <unsigned N>
struct NonZero {
enum { VALUE = N > 0 ? N : 1 };
};
// A formatting argument. It is a POD type to allow storage in
// internal::MemoryBuffer.
struct Arg {
template <typename Char>
struct StringValue {
const Char *value;
std::size_t size;
};
typedef void (*FormatFunc)(
void *formatter, const void *arg, void *format_str_ptr);
struct CustomValue {
const void *value;
FormatFunc format;
};
union {
int int_value;
unsigned uint_value;
LongLong long_long_value;
ULongLong ulong_long_value;
double double_value;
long double long_double_value;
const void *pointer;
StringValue<char> string;
StringValue<signed char> sstring;
StringValue<unsigned char> ustring;
StringValue<wchar_t> wstring;
CustomValue custom;
};
enum Type {
NONE,
// Integer types should go first,
INT, UINT, LONG_LONG, ULONG_LONG, CHAR, LAST_INTEGER_TYPE = CHAR,
// followed by floating-point types.
DOUBLE, LONG_DOUBLE, LAST_NUMERIC_TYPE = LONG_DOUBLE,
CSTRING, STRING, WSTRING, POINTER, CUSTOM
};
Type type;
};
template <typename T = void>
struct None {};
// A helper class template to enable or disable overloads taking wide
// characters and strings in MakeValue.
template <typename T, typename Char>
struct WCharHelper {
typedef None<T> Supported;
typedef T Unsupported;
};
template <typename T>
struct WCharHelper<T, wchar_t> {
typedef T Supported;
typedef None<T> Unsupported;
};
template <typename T>
class IsConvertibleToInt {
private:
typedef char yes[1];
typedef char no[2];
static const T &get();
static yes &check(fmt::ULongLong);
static no &check(...);
public:
enum { value = (sizeof(check(get())) == sizeof(yes)) };
};
#define FMT_CONVERTIBLE_TO_INT(Type) \
template <> \
class IsConvertibleToInt<Type> { \
public: \
enum { value = 1 }; \
}
// Silence warnings about convering float to int.
FMT_CONVERTIBLE_TO_INT(float);
FMT_CONVERTIBLE_TO_INT(double);
FMT_CONVERTIBLE_TO_INT(long double);
template<bool B, class T = void>
struct EnableIf {};
template<class T>
struct EnableIf<true, T> { typedef T type; };
// A helper function to suppress bogus "conditional expression is constant"
// warnings.
inline bool check(bool value) { return value; }
// Makes an Arg object from any type.
template <typename Char>
class MakeValue : public Arg {
private:
// The following two methods are private to disallow formatting of
// arbitrary pointers. If you want to output a pointer cast it to
// "void *" or "const void *". In particular, this forbids formatting
// of "[const] volatile char *" which is printed as bool by iostreams.
// Do not implement!
template <typename T>
MakeValue(const T *value);
template <typename T>
MakeValue(T *value);
// The following methods are private to disallow formatting of wide
// characters and strings into narrow strings as in
// fmt::format("{}", L"test");
// To fix this, use a wide format string: fmt::format(L"{}", L"test").
MakeValue(typename WCharHelper<wchar_t, Char>::Unsupported);
MakeValue(typename WCharHelper<wchar_t *, Char>::Unsupported);
MakeValue(typename WCharHelper<const wchar_t *, Char>::Unsupported);
MakeValue(typename WCharHelper<const std::wstring &, Char>::Unsupported);
MakeValue(typename WCharHelper<WStringRef, Char>::Unsupported);
void set_string(StringRef str) {
string.value = str.c_str();
string.size = str.size();
}
void set_string(WStringRef str) {
wstring.value = str.c_str();
wstring.size = str.size();
}
// Formats an argument of a custom type, such as a user-defined class.
template <typename T>
static void format_custom_arg(
void *formatter, const void *arg, void *format_str_ptr) {
format(*static_cast<BasicFormatter<Char>*>(formatter),
*static_cast<const Char**>(format_str_ptr),
*static_cast<const T*>(arg));
}
public:
MakeValue() {}
#define FMT_MAKE_VALUE(Type, field, TYPE) \
MakeValue(Type value) { field = value; } \
static uint64_t type(Type) { return Arg::TYPE; }
FMT_MAKE_VALUE(bool, int_value, INT)
FMT_MAKE_VALUE(short, int_value, INT)
FMT_MAKE_VALUE(unsigned short, uint_value, UINT)
FMT_MAKE_VALUE(int, int_value, INT)
FMT_MAKE_VALUE(unsigned, uint_value, UINT)
MakeValue(long value) {
// To minimize the number of types we need to deal with, long is
// translated either to int or to long long depending on its size.
if (check(sizeof(long) == sizeof(int)))
int_value = static_cast<int>(value);
else
long_long_value = value;
}
static uint64_t type(long) {
return sizeof(long) == sizeof(int) ? Arg::INT : Arg::LONG_LONG;
}
MakeValue(unsigned long value) {
if (check(sizeof(unsigned long) == sizeof(unsigned)))
uint_value = static_cast<unsigned>(value);
else
ulong_long_value = value;
}
static uint64_t type(unsigned long) {
return sizeof(unsigned long) == sizeof(unsigned) ?
Arg::UINT : Arg::ULONG_LONG;
}
FMT_MAKE_VALUE(LongLong, long_long_value, LONG_LONG)
FMT_MAKE_VALUE(ULongLong, ulong_long_value, ULONG_LONG)
FMT_MAKE_VALUE(float, double_value, DOUBLE)
FMT_MAKE_VALUE(double, double_value, DOUBLE)
FMT_MAKE_VALUE(long double, long_double_value, LONG_DOUBLE)
FMT_MAKE_VALUE(signed char, int_value, CHAR)
FMT_MAKE_VALUE(unsigned char, int_value, CHAR)
FMT_MAKE_VALUE(char, int_value, CHAR)
MakeValue(typename WCharHelper<wchar_t, Char>::Supported value) {
int_value = value;
}
static uint64_t type(wchar_t) { return Arg::CHAR; }
#define FMT_MAKE_STR_VALUE(Type, TYPE) \
MakeValue(Type value) { set_string(value); } \
static uint64_t type(Type) { return Arg::TYPE; }
FMT_MAKE_VALUE(char *, string.value, CSTRING)
FMT_MAKE_VALUE(const char *, string.value, CSTRING)
FMT_MAKE_VALUE(const signed char *, sstring.value, CSTRING)
FMT_MAKE_VALUE(const unsigned char *, ustring.value, CSTRING)
FMT_MAKE_STR_VALUE(const std::string &, STRING)
FMT_MAKE_STR_VALUE(StringRef, STRING)
#define FMT_MAKE_WSTR_VALUE(Type, TYPE) \
MakeValue(typename WCharHelper<Type, Char>::Supported value) { \
set_string(value); \
} \
static uint64_t type(Type) { return Arg::TYPE; }
FMT_MAKE_WSTR_VALUE(wchar_t *, WSTRING)
FMT_MAKE_WSTR_VALUE(const wchar_t *, WSTRING)
FMT_MAKE_WSTR_VALUE(const std::wstring &, WSTRING)
FMT_MAKE_WSTR_VALUE(WStringRef, WSTRING)
FMT_MAKE_VALUE(void *, pointer, POINTER)
FMT_MAKE_VALUE(const void *, pointer, POINTER)
template <typename T>
MakeValue(const T &value,
typename EnableIf<!IsConvertibleToInt<T>::value, int>::type = 0) {
custom.value = &value;
custom.format = &format_custom_arg<T>;
}
template <typename T>
MakeValue(const T &value,
typename EnableIf<IsConvertibleToInt<T>::value, int>::type = 0) {
int_value = value;
}
template <typename T>
static uint64_t type(const T &) {
return IsConvertibleToInt<T>::value ? Arg::INT : Arg::CUSTOM;
}
};
#define FMT_DISPATCH(call) static_cast<Impl*>(this)->call
// An argument visitor.
// To use ArgVisitor define a subclass that implements some or all of the
// visit methods with the same signatures as the methods in ArgVisitor,
// for example, visit_int(int).
// Specify the subclass name as the Impl template parameter. Then calling
// ArgVisitor::visit for some argument will dispatch to a visit method
// specific to the argument type. For example, if the argument type is
// double then visit_double(double) method of a subclass will be called.
// If the subclass doesn't contain a method with this signature, then
// a corresponding method of ArgVisitor will be called.
//
// Example:
// class MyArgVisitor : public ArgVisitor<MyArgVisitor, void> {
// public:
// void visit_int(int value) { print("{}", value); }
// void visit_double(double value) { print("{}", value ); }
// };
//
// ArgVisitor uses the curiously recurring template pattern:
// http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern
template <typename Impl, typename Result>
class ArgVisitor {
public:
void report_unhandled_arg() {}
Result visit_unhandled_arg() {
FMT_DISPATCH(report_unhandled_arg());
return Result();
}
Result visit_int(int value) {
return FMT_DISPATCH(visit_any_int(value));
}
Result visit_long_long(LongLong value) {
return FMT_DISPATCH(visit_any_int(value));
}
Result visit_uint(unsigned value) {
return FMT_DISPATCH(visit_any_int(value));
}
Result visit_ulong_long(ULongLong value) {
return FMT_DISPATCH(visit_any_int(value));
}
Result visit_char(int value) {
return FMT_DISPATCH(visit_any_int(value));
}
template <typename T>
Result visit_any_int(T) {
return FMT_DISPATCH(visit_unhandled_arg());
}
Result visit_double(double value) {
return FMT_DISPATCH(visit_any_double(value));
}
Result visit_long_double(long double value) {
return FMT_DISPATCH(visit_any_double(value));