mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
119 lines
4.6 KiB
C++
119 lines
4.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_WEED_DETAIL_FIND_CHARACTER_SET_HPP
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#define SPROUT_WEED_DETAIL_FIND_CHARACTER_SET_HPP
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#include <iterator>
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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/iterator/type_traits/category.hpp>
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#include <sprout/utility/pair/pair.hpp>
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namespace sprout {
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namespace weed {
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namespace detail {
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template<typename RandomAccessIterator, typename T>
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inline SPROUT_CONSTEXPR RandomAccessIterator
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find_character_set_impl_ra(
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RandomAccessIterator first, RandomAccessIterator last, T const& value,
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typename std::iterator_traits<RandomAccessIterator>::difference_type pivot, RandomAccessIterator found
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)
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{
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return found != first ? found
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: pivot == 0 ? (
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*first == T('-') ? *sprout::prev(first) <= value && *sprout::next(first) >= value
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: *first == value
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) ? first : last
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: sprout::weed::detail::find_character_set_impl_ra(
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sprout::next(first, pivot), last, value,
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(sprout::distance(first, last) - pivot) / 2,
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sprout::weed::detail::find_character_set_impl_ra(
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first, sprout::next(first, pivot), value,
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pivot / 2,
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first
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)
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)
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;
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}
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template<typename RandomAccessIterator, typename T>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_constant_distance_iterator<RandomAccessIterator>::value,
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RandomAccessIterator
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>::type
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find_character_set(
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RandomAccessIterator first, RandomAccessIterator last, T const& value,
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std::random_access_iterator_tag*
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)
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{
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return first == last ? last
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: sprout::weed::detail::find_character_set_impl_ra(first, last, value, sprout::distance(first, last) / 2, first)
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;
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}
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template<typename BidirectionalIterator, typename T>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator, bool>
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find_character_set_impl_1(
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sprout::pair<BidirectionalIterator, bool> const& current,
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BidirectionalIterator last, T const& value, typename std::iterator_traits<BidirectionalIterator>::difference_type n
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)
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{
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typedef sprout::pair<BidirectionalIterator, bool> type;
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return current.second || current.first == last ? current
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: n == 1 ? (
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*current.first == T('-') ? *sprout::prev(current.first) <= value && *sprout::next(current.first) >= value
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: *current.first == value
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) ? type(current.first, true) : type(sprout::next(current.first), false)
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: sprout::weed::detail::find_character_set_impl_1(
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sprout::weed::detail::find_character_set_impl_1(
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current,
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last, value, n / 2
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),
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last, value, n - n / 2
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)
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;
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}
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template<typename BidirectionalIterator, typename T>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator, bool>
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find_character_set_impl(
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sprout::pair<BidirectionalIterator, bool> const& current,
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BidirectionalIterator last, T const& value, typename std::iterator_traits<BidirectionalIterator>::difference_type n
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)
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{
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return current.second || current.first == last ? current
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: sprout::weed::detail::find_character_set_impl(
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sprout::weed::detail::find_character_set_impl_1(
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current,
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last, value, n
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),
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last, value, n * 2
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)
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;
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}
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template<typename BidirectionalIterator, typename T>
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inline SPROUT_CONSTEXPR BidirectionalIterator
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find_character_set(
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BidirectionalIterator first, BidirectionalIterator last, T const& value,
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std::input_iterator_tag*
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)
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{
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typedef sprout::pair<BidirectionalIterator, bool> type;
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return sprout::weed::detail::find_character_set_impl(type(first, false), last, value, 1).first;
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}
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template<typename BidirectionalIterator, typename T>
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inline SPROUT_CONSTEXPR BidirectionalIterator
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find_character_set(BidirectionalIterator first, BidirectionalIterator last, T const& value) {
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typedef typename std::iterator_traits<BidirectionalIterator>::iterator_category* category;
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return sprout::weed::detail::find_character_set(first, last, value, category());
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}
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} // namespace detail
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_DETAIL_FIND_CHARACTER_SET_HPP
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