mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
238 lines
11 KiB
C++
238 lines
11 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2013 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_STRING_FLOAT_TO_STRING_HPP
|
|
#define SPROUT_STRING_FLOAT_TO_STRING_HPP
|
|
|
|
#include <cstddef>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/limits.hpp>
|
|
#include <sprout/index_tuple/metafunction.hpp>
|
|
#include <sprout/string/string.hpp>
|
|
#include <sprout/type_traits/integral_constant.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
#include <sprout/math/isinf.hpp>
|
|
#include <sprout/math/isnan.hpp>
|
|
#include <sprout/math/signbit.hpp>
|
|
#include <sprout/math/floor.hpp>
|
|
#include <sprout/detail/char_conversion.hpp>
|
|
#include <sprout/detail/math/int.hpp>
|
|
#include <sprout/detail/math/float.hpp>
|
|
#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
SPROUT_STATIC_CONSTEXPR std::size_t decimal_places_length = 6;
|
|
} // namespace detail
|
|
|
|
//
|
|
// printed_float_digits
|
|
//
|
|
template<typename FloatType>
|
|
struct printed_float_digits
|
|
: public sprout::integral_constant<
|
|
std::size_t,
|
|
sprout::numeric_limits<FloatType>::max_exponent10 + sprout::detail::decimal_places_length + 2
|
|
>
|
|
{};
|
|
|
|
namespace detail {
|
|
template<typename Elem, typename FloatType, sprout::index_t... Indexes>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
|
|
float_to_string_impl(FloatType val, bool negative, int digits, int v, sprout::index_tuple<Indexes...>) {
|
|
typedef sprout::detail::string_construct_access<Elem, sprout::printed_float_digits<FloatType>::value> access_type;
|
|
return negative
|
|
? access_type::raw_construct(
|
|
static_cast<std::size_t>(digits + 2 + sprout::detail::decimal_places_length),
|
|
static_cast<Elem>('-'),
|
|
(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - 1 - Indexes))
|
|
: Indexes == digits ? static_cast<Elem>('.')
|
|
: Indexes < digits + 1 + sprout::detail::decimal_places_length
|
|
? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(v, digits + sprout::detail::decimal_places_length - Indexes))
|
|
: Elem()
|
|
)...
|
|
)
|
|
: access_type::raw_construct(
|
|
static_cast<std::size_t>(digits + 1 + sprout::detail::decimal_places_length),
|
|
(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, digits - 1 - Indexes))
|
|
: Indexes == digits ? static_cast<Elem>('.')
|
|
: Indexes < digits + 1 + sprout::detail::decimal_places_length
|
|
? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(v, digits + sprout::detail::decimal_places_length - Indexes))
|
|
: Elem()
|
|
)...
|
|
)
|
|
;
|
|
}
|
|
template<typename Elem, typename FloatType>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
|
|
float_to_string(FloatType val, bool negative, int digits) {
|
|
return sprout::detail::float_to_string_impl<Elem>(
|
|
val, negative, digits, static_cast<int>((val - sprout::math::floor(val)) * sprout::detail::int_pow<int>(sprout::detail::decimal_places_length)),
|
|
sprout::make_index_tuple<sprout::printed_float_digits<FloatType>::value - 1>::make()
|
|
);
|
|
}
|
|
} // namespace detail
|
|
|
|
//
|
|
// float_to_string
|
|
//
|
|
template<
|
|
typename Elem, typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
|
|
float_to_string(FloatType val) {
|
|
typedef sprout::detail::string_construct_access<Elem, sprout::printed_float_digits<FloatType>::value> access_type;
|
|
return sprout::math::isinf(val) ? sprout::math::signbit(val)
|
|
? access_type::raw_construct(4, static_cast<Elem>('-'), static_cast<Elem>('i'), static_cast<Elem>('n'), static_cast<Elem>('f'))
|
|
: access_type::raw_construct(3, static_cast<Elem>('i'), static_cast<Elem>('n'), static_cast<Elem>('f'))
|
|
: sprout::math::isnan(val) ? sprout::math::signbit(val)
|
|
? access_type::raw_construct(4, static_cast<Elem>('-'), static_cast<Elem>('n'), static_cast<Elem>('a'), static_cast<Elem>('n'))
|
|
: access_type::raw_construct(3, static_cast<Elem>('n'), static_cast<Elem>('a'), static_cast<Elem>('n'))
|
|
: sprout::detail::float_to_string<Elem>(
|
|
sprout::detail::float_round_at(val < 0 ? -val : val, sprout::detail::decimal_places_length),
|
|
sprout::math::signbit(val),
|
|
sprout::detail::float_digits_checked(val)
|
|
)
|
|
;
|
|
}
|
|
|
|
namespace detail {
|
|
template<typename FloatType>
|
|
struct printed_float_exponent10_digits
|
|
: public sprout::integral_constant<
|
|
std::size_t,
|
|
NS_SSCRISK_CEL_OR_SPROUT::max(sprout::detail::int_digits(sprout::numeric_limits<FloatType>::max_exponent10), 2)
|
|
>
|
|
{};
|
|
} // namespace detail
|
|
|
|
//
|
|
// printed_float_exp_digits
|
|
//
|
|
template<typename FloatType>
|
|
struct printed_float_exp_digits
|
|
: public sprout::integral_constant<
|
|
std::size_t,
|
|
5 + sprout::detail::decimal_places_length + sprout::detail::printed_float_exponent10_digits<FloatType>::value
|
|
>
|
|
{};
|
|
|
|
namespace detail {
|
|
template<typename Elem, typename FloatType, sprout::index_t... Indexes>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_exp_digits<FloatType>::value>
|
|
float_to_string_exp(FloatType val, bool negative, int exponent10, int e10_digits, sprout::index_tuple<Indexes...>) {
|
|
typedef sprout::detail::string_construct_access<Elem, sprout::printed_float_exp_digits<FloatType>::value> access_type;
|
|
return negative
|
|
? access_type::raw_construct(
|
|
static_cast<std::size_t>(5 + sprout::detail::decimal_places_length + e10_digits),
|
|
static_cast<Elem>('-'),
|
|
(Indexes == 0 ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, 0))
|
|
: Indexes == 1 ? static_cast<Elem>('.')
|
|
: Indexes < 2 + sprout::detail::decimal_places_length
|
|
? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, 1 - Indexes))
|
|
: Indexes == 2 + sprout::detail::decimal_places_length ? static_cast<Elem>('e')
|
|
: Indexes == 3 + sprout::detail::decimal_places_length ? static_cast<Elem>(exponent10 < 0 ? '-' : '+')
|
|
: Indexes < 4 + sprout::detail::decimal_places_length + e10_digits
|
|
? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(exponent10, 3 + sprout::detail::decimal_places_length + e10_digits - Indexes))
|
|
: Elem()
|
|
)...
|
|
)
|
|
: access_type::raw_construct(
|
|
static_cast<std::size_t>(4 + sprout::detail::decimal_places_length + e10_digits),
|
|
(Indexes == 0 ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, 0))
|
|
: Indexes == 1 ? static_cast<Elem>('.')
|
|
: Indexes < 2 + sprout::detail::decimal_places_length
|
|
? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_at(val, 1 - Indexes))
|
|
: Indexes == 2 + sprout::detail::decimal_places_length ? static_cast<Elem>('e')
|
|
: Indexes == 3 + sprout::detail::decimal_places_length ? static_cast<Elem>(exponent10 < 0 ? '-' : '+')
|
|
: Indexes < 4 + sprout::detail::decimal_places_length + e10_digits
|
|
? sprout::detail::int_to_char<Elem>(sprout::detail::int_digit_at(exponent10, 3 + sprout::detail::decimal_places_length + e10_digits - Indexes))
|
|
: Elem()
|
|
)...
|
|
)
|
|
;
|
|
}
|
|
} // namespace detail
|
|
|
|
//
|
|
// float_to_string_exp
|
|
//
|
|
template<
|
|
typename Elem, typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_exp_digits<FloatType>::value>
|
|
float_to_string_exp(FloatType val) {
|
|
typedef sprout::detail::string_construct_access<Elem, sprout::printed_float_exp_digits<FloatType>::value> access_type;
|
|
return sprout::math::isinf(val) ? sprout::math::signbit(val)
|
|
? access_type::raw_construct(4, static_cast<Elem>('-'), static_cast<Elem>('i'), static_cast<Elem>('n'), static_cast<Elem>('f'))
|
|
: access_type::raw_construct(3, static_cast<Elem>('i'), static_cast<Elem>('n'), static_cast<Elem>('f'))
|
|
: sprout::math::isnan(val) ? sprout::math::signbit(val)
|
|
? access_type::raw_construct(4, static_cast<Elem>('-'), static_cast<Elem>('n'), static_cast<Elem>('a'), static_cast<Elem>('n'))
|
|
: access_type::raw_construct(3, static_cast<Elem>('n'), static_cast<Elem>('a'), static_cast<Elem>('n'))
|
|
: sprout::detail::float_to_string_exp<Elem>(
|
|
sprout::detail::float_round_at(
|
|
(val < 0 ? -val : val) / sprout::detail::float_pow10<FloatType>(sprout::detail::float_exponent10(val)),
|
|
sprout::detail::decimal_places_length
|
|
),
|
|
sprout::math::signbit(val),
|
|
sprout::detail::float_exponent10(val),
|
|
NS_SSCRISK_CEL_OR_SPROUT::max(sprout::detail::int_digits(sprout::detail::float_exponent10(val)), 2),
|
|
sprout::make_index_tuple<sprout::printed_float_exp_digits<FloatType>::value - 1>::make()
|
|
)
|
|
;
|
|
}
|
|
|
|
//
|
|
// to_string_of
|
|
//
|
|
template<typename Elem, typename FloatType, typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
|
|
to_string_of(FloatType val) {
|
|
return sprout::float_to_string<Elem>(val);
|
|
}
|
|
|
|
//
|
|
// to_string
|
|
//
|
|
template<typename FloatType, typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<char, sprout::printed_float_digits<FloatType>::value>
|
|
to_string(FloatType val) {
|
|
return sprout::to_string_of<char>(val);
|
|
}
|
|
|
|
//
|
|
// to_wstring
|
|
//
|
|
template<typename FloatType, typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<wchar_t, sprout::printed_float_digits<FloatType>::value>
|
|
to_wstring(FloatType val) {
|
|
return sprout::to_string_of<wchar_t>(val);
|
|
}
|
|
|
|
//
|
|
// to_u16string
|
|
//
|
|
template<typename FloatType, typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<char16_t, sprout::printed_float_digits<FloatType>::value>
|
|
to_u16string(FloatType val) {
|
|
return sprout::to_string_of<char16_t>(val);
|
|
}
|
|
|
|
//
|
|
// to_u32string
|
|
//
|
|
template<typename FloatType, typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR sprout::basic_string<char32_t, sprout::printed_float_digits<FloatType>::value>
|
|
to_u32string(FloatType val) {
|
|
return sprout::to_string_of<char32_t>(val);
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_STRING_FLOAT_TO_STRING_HPP
|