mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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165 lines
6.8 KiB
C++
165 lines
6.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 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_CSTDLIB_STR_TO_INT_HPP
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#define SPROUT_CSTDLIB_STR_TO_INT_HPP
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#include <cstdlib>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/type_traits/is_signed.hpp>
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#include <sprout/type_traits/is_unsigned.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/detail/char_literal.hpp>
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#include <sprout/detail/char_conversion.hpp>
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#if !defined(_MSC_VER)
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# include <cinttypes>
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#endif
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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 NullTerminatedIterator>
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inline SPROUT_CONSTEXPR IntType
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str_to_int_impl_1(NullTerminatedIterator const& str, int base, IntType val, IntType x, bool negative) {
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return x == static_cast<IntType>(-1) ? (negative ? -1 * val : val)
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: val > (sprout::numeric_limits<IntType>::max() - x - (negative ? 1 : 0)) / base
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? (negative ? sprout::numeric_limits<IntType>::min() : sprout::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 NullTerminatedIterator>
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inline SPROUT_CONSTEXPR IntType
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str_to_int_impl(NullTerminatedIterator const& str, int base, bool negative) {
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typedef typename std::iterator_traits<NullTerminatedIterator>::value_type char_type;
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return *str == SPROUT_CHAR_LITERAL('0', char_type)
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? *sprout::next(str) == SPROUT_CHAR_LITERAL('x', char_type)
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|| *sprout::next(str) == SPROUT_CHAR_LITERAL('X', char_type)
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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 ? base : 16),
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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 ? base : 8),
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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 ? base : 10),
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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 NullTerminatedIterator>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_unsigned<IntType>::value,
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IntType
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>::type
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str_to_int(NullTerminatedIterator const& str, int base) {
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typedef typename std::iterator_traits<NullTerminatedIterator>::value_type char_type;
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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 == SPROUT_CHAR_LITERAL('+', char_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 NullTerminatedIterator>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_signed<IntType>::value,
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IntType
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>::type
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str_to_int(NullTerminatedIterator const& str, int base) {
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typedef typename std::iterator_traits<NullTerminatedIterator>::value_type char_type;
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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 == SPROUT_CHAR_LITERAL('-', char_type)
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? sprout::detail::str_to_int_impl<IntType>(sprout::next(str), base, true)
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: *str == SPROUT_CHAR_LITERAL('+', char_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 NullTerminatedIterator, typename CharPtr>
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inline SPROUT_CONSTEXPR IntType
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str_to_int(NullTerminatedIterator const& str, CharPtr* endptr, int base) {
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return !endptr ? sprout::detail::str_to_int<IntType>(str, base)
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#if defined(_MSC_VER)
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: sprout::is_signed<IntType>::value
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? static_cast<IntType>(std::strtol(&*str, endptr, base))
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: static_cast<IntType>(std::strtoul(&*str, endptr, base))
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#elif defined(__MINGW32__)
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: sprout::is_signed<IntType>::value
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? sizeof(IntType) <= sizeof(long) ? static_cast<IntType>(std::strtol(&*str, endptr, base))
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: sizeof(IntType) <= sizeof(long long) ? static_cast<IntType>(::strtoll(&*str, endptr, base))
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: static_cast<IntType>(std::strtoimax(&*str, endptr, base))
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: sizeof(IntType) <= sizeof(unsigned long) ? static_cast<IntType>(std::strtoul(&*str, endptr, base))
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: sizeof(IntType) <= sizeof(unsigned long long) ? static_cast<IntType>(::strtoull(&*str, endptr, base))
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: static_cast<IntType>(std::strtoumax(&*str, endptr, base))
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#else
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: sprout::is_signed<IntType>::value
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? sizeof(IntType) <= sizeof(long) ? static_cast<IntType>(std::strtol(&*str, endptr, base))
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: sizeof(IntType) <= sizeof(long long) ? static_cast<IntType>(std::strtoll(&*str, endptr, base))
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: static_cast<IntType>(std::strtoimax(&*str, endptr, base))
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: sizeof(IntType) <= sizeof(unsigned long) ? static_cast<IntType>(std::strtoul(&*str, endptr, base))
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: sizeof(IntType) <= sizeof(unsigned long long) ? static_cast<IntType>(std::strtoull(&*str, endptr, base))
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: static_cast<IntType>(std::strtoumax(&*str, endptr, base))
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#endif
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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>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_integral<IntType>::value,
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IntType
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>::type
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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>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_integral<IntType>::value,
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IntType
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>::type
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str_to_int(Char const* str, std::nullptr_t, 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>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_integral<IntType>::value,
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IntType
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>::type
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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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