mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
106 lines
4.7 KiB
C++
106 lines
4.7 KiB
C++
#ifndef SPROUT_CSTDLIB_STR_TO_INT_HPP
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#define SPROUT_CSTDLIB_STR_TO_INT_HPP
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#include <cstddef>
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#include <cstdlib>
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/ctype/ascii.hpp>
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#include <sprout/utility/enabler_if.hpp>
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#include <sprout/detail/char_conversion.hpp>
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namespace sprout {
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namespace detail {
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// Copyright (c) 2011 osyo-manga : http://d.hatena.ne.jp/osyo-manga/
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template<typename IntType, typename CStrIterator>
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inline SPROUT_CONSTEXPR IntType str_to_int_impl_1(CStrIterator str, int base, IntType val, IntType x, bool negative) {
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return x == static_cast<IntType>(-1)
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? (negative ? -val : val)
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: val > (std::numeric_limits<IntType>::max() - x - (negative ? 1 : 0)) / base
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? (negative ? std::numeric_limits<IntType>::min() : std::numeric_limits<IntType>::max())
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: sprout::detail::str_to_int_impl_1<IntType>(
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sprout::next(str),
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base,
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val * base + x,
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sprout::detail::char_to_int<IntType>(*sprout::next(str), base),
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negative
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)
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;
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}
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template<typename IntType, typename CStrIterator>
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inline SPROUT_CONSTEXPR IntType str_to_int_impl(CStrIterator str, int base, bool negative) {
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return *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('0')
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? *sprout::next(str) == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('x')
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|| *sprout::next(str) == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('X')
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? sprout::detail::str_to_int_impl_1<IntType>(
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sprout::next(str, 2),
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base ? base : 16,
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IntType(),
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sprout::detail::char_to_int<IntType>(*sprout::next(str, 2), base),
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negative
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)
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: sprout::detail::str_to_int_impl_1<IntType>(
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sprout::next(str),
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base ? base : 8,
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IntType(),
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sprout::detail::char_to_int<IntType>(*sprout::next(str), base),
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negative
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)
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: sprout::detail::str_to_int_impl_1<IntType>(
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str,
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base ? base : 10,
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IntType(),
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sprout::detail::char_to_int<IntType>(*str, base),
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negative
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)
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;
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}
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template<typename IntType, typename CStrIterator, typename sprout::enabler_if<std::is_unsigned<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR IntType str_to_int(CStrIterator str, int base) {
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return sprout::ascii::isspace(*str)
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? sprout::detail::str_to_int<IntType>(sprout::next(str), base)
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: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('+')
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? sprout::detail::str_to_int_impl<IntType>(sprout::next(str), base, false)
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: sprout::detail::str_to_int_impl<IntType>(str, base, false)
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;
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}
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template<typename IntType, typename CStrIterator, typename sprout::enabler_if<std::is_signed<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR IntType str_to_int(CStrIterator str, int base) {
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return sprout::ascii::isspace(*str)
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? sprout::detail::str_to_int<IntType>(sprout::next(str), base)
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: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('-')
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? sprout::detail::str_to_int_impl<IntType>(sprout::next(str), base, true)
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: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('+')
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? sprout::detail::str_to_int_impl<IntType>(sprout::next(str), base, false)
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: sprout::detail::str_to_int_impl<IntType>(str, base, false)
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;
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}
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template<typename IntType, typename CStrIterator, typename CharPtr>
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inline SPROUT_CONSTEXPR IntType str_to_int(CStrIterator str, CharPtr* endptr, int base) {
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return !endptr ? sprout::detail::str_to_int<IntType>(str, base)
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: std::strtol(str, endptr, base)
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;
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}
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} // namespace detail
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//
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// str_to_int
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//
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template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR IntType str_to_int(Char const* str, Char** endptr, int base = 10) {
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return sprout::detail::str_to_int<IntType>(str, endptr, base);
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}
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template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR IntType str_to_int(Char const* str, std::nullptr_t endptr, int base = 10) {
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return sprout::detail::str_to_int<IntType>(str, base);
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}
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template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR IntType str_to_int(Char const* str, int base = 10) {
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return sprout::detail::str_to_int<IntType>(str, base);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTDLIB_STR_TO_INT_HPP
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