mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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64 lines
2.9 KiB
C++
64 lines
2.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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_DETAIL_CHAR_CONVERSION_HPP
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#define SPROUT_DETAIL_CHAR_CONVERSION_HPP
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#include <stdexcept>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/ctype/ascii.hpp>
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#include <sprout/assert.hpp>
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#include <sprout/static_assert.hpp>
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#include <sprout/detail/char_literal.hpp>
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#include <sprout/detail/char_type_of_consecutive.hpp>
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namespace sprout {
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namespace detail {
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template<typename Elem, typename IntType>
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inline SPROUT_CONSTEXPR Elem
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int_to_char(IntType val, int base) {
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_digits<Elem>::value);
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_lower_alphabet<Elem>::value);
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return SPROUT_ASSERT(2 <= base && base <= 36), SPROUT_ASSERT(IntType(0) <= val && val < static_cast<IntType>(base)),
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val < 10 ? SPROUT_CHAR_LITERAL('0', Elem) + val
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: SPROUT_CHAR_LITERAL('a', Elem) + (val - 10)
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;
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}
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template<typename Elem, typename IntType>
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inline SPROUT_CONSTEXPR Elem
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int_to_char(IntType val) {
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_digits<Elem>::value);
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return SPROUT_ASSERT(IntType(0) <= val && val < IntType(10)),
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SPROUT_CHAR_LITERAL('0', Elem) + val
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;
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}
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template<typename IntType, typename Elem>
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inline SPROUT_CONSTEXPR IntType
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char_to_int(Elem c, int base) {
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_digits<Elem>::value);
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_lower_alphabet<Elem>::value);
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_upper_alphabet<Elem>::value);
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return sprout::ascii::isdigit(c) && c - SPROUT_CHAR_LITERAL('0', Elem) < base ? c - SPROUT_CHAR_LITERAL('0', Elem)
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: sprout::ascii::islower(c) && c - SPROUT_CHAR_LITERAL('a', Elem) + 10 < base ? c - SPROUT_CHAR_LITERAL('a', Elem) + 10
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: sprout::ascii::isupper(c) && c - SPROUT_CHAR_LITERAL('A', Elem) + 10 < base ? c - SPROUT_CHAR_LITERAL('A', Elem) + 10
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: static_cast<IntType>(-1)
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;
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}
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template<typename IntType, typename Elem>
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inline SPROUT_CONSTEXPR IntType
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char_to_int(Elem c) {
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SPROUT_STATIC_ASSERT(sprout::detail::is_char_type_of_consecutive_digits<Elem>::value);
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return sprout::ascii::isdigit(c) ? c - SPROUT_CHAR_LITERAL('0', Elem)
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: static_cast<IntType>(-1)
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;
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_CHAR_CONVERSION_HPP
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