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