mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
232 lines
8.1 KiB
C++
232 lines
8.1 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___RANGES_SPLIT_VIEW_H
|
|
#define _LIBCPP___RANGES_SPLIT_VIEW_H
|
|
|
|
#include <__algorithm/ranges_search.h>
|
|
#include <__concepts/constructible.h>
|
|
#include <__config>
|
|
#include <__functional/bind_back.h>
|
|
#include <__functional/ranges_operations.h>
|
|
#include <__iterator/indirectly_comparable.h>
|
|
#include <__iterator/iterator_traits.h>
|
|
#include <__memory/addressof.h>
|
|
#include <__ranges/access.h>
|
|
#include <__ranges/all.h>
|
|
#include <__ranges/concepts.h>
|
|
#include <__ranges/empty.h>
|
|
#include <__ranges/non_propagating_cache.h>
|
|
#include <__ranges/range_adaptor.h>
|
|
#include <__ranges/single_view.h>
|
|
#include <__ranges/subrange.h>
|
|
#include <__ranges/view_interface.h>
|
|
#include <__type_traits/decay.h>
|
|
#include <__type_traits/is_nothrow_constructible.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if _LIBCPP_STD_VER >= 20
|
|
|
|
namespace ranges {
|
|
|
|
template <forward_range _View, forward_range _Pattern>
|
|
requires view<_View> && view<_Pattern> &&
|
|
indirectly_comparable<iterator_t<_View>, iterator_t<_Pattern>, ranges::equal_to>
|
|
class split_view : public view_interface<split_view<_View, _Pattern>> {
|
|
private:
|
|
_LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
|
|
_LIBCPP_NO_UNIQUE_ADDRESS _Pattern __pattern_ = _Pattern();
|
|
using _Cache = __non_propagating_cache<subrange<iterator_t<_View>>>;
|
|
_Cache __cached_begin_ = _Cache();
|
|
|
|
template <class, class>
|
|
friend struct __iterator;
|
|
|
|
template <class, class>
|
|
friend struct __sentinel;
|
|
|
|
struct __iterator;
|
|
struct __sentinel;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr subrange<iterator_t<_View>> __find_next(iterator_t<_View> __it) {
|
|
auto [__begin, __end] = ranges::search(subrange(__it, ranges::end(__base_)), __pattern_);
|
|
if (__begin != ranges::end(__base_) && ranges::empty(__pattern_)) {
|
|
++__begin;
|
|
++__end;
|
|
}
|
|
return {__begin, __end};
|
|
}
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI split_view()
|
|
requires default_initializable<_View> && default_initializable<_Pattern>
|
|
= default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 split_view(_View __base, _Pattern __pattern)
|
|
: __base_(std::move(__base)), __pattern_(std::move((__pattern))) {}
|
|
|
|
template <forward_range _Range>
|
|
requires constructible_from<_View, views::all_t<_Range>> &&
|
|
constructible_from<_Pattern, single_view<range_value_t<_Range>>>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23
|
|
split_view(_Range&& __range, range_value_t<_Range> __elem)
|
|
: __base_(views::all(std::forward<_Range>(__range))), __pattern_(views::single(std::move(__elem))) {}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr _View base() const&
|
|
requires copy_constructible<_View>
|
|
{
|
|
return __base_;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr _View base() && { return std::move(__base_); }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr __iterator begin() {
|
|
if (!__cached_begin_.__has_value()) {
|
|
__cached_begin_.__emplace(__find_next(ranges::begin(__base_)));
|
|
}
|
|
return {*this, ranges::begin(__base_), *__cached_begin_};
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr auto end() {
|
|
if constexpr (common_range<_View>) {
|
|
return __iterator{*this, ranges::end(__base_), {}};
|
|
} else {
|
|
return __sentinel{*this};
|
|
}
|
|
}
|
|
};
|
|
|
|
template <class _Range, class _Pattern>
|
|
split_view(_Range&&, _Pattern&&) -> split_view<views::all_t<_Range>, views::all_t<_Pattern>>;
|
|
|
|
template <forward_range _Range>
|
|
split_view(_Range&&, range_value_t<_Range>) -> split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>;
|
|
|
|
template <forward_range _View, forward_range _Pattern>
|
|
requires view<_View> && view<_Pattern> &&
|
|
indirectly_comparable<iterator_t<_View>, iterator_t<_Pattern>, ranges::equal_to>
|
|
struct split_view<_View, _Pattern>::__iterator {
|
|
private:
|
|
split_view* __parent_ = nullptr;
|
|
_LIBCPP_NO_UNIQUE_ADDRESS iterator_t<_View> __cur_ = iterator_t<_View>();
|
|
_LIBCPP_NO_UNIQUE_ADDRESS subrange<iterator_t<_View>> __next_ = subrange<iterator_t<_View>>();
|
|
bool __trailing_empty_ = false;
|
|
|
|
friend struct __sentinel;
|
|
|
|
public:
|
|
using iterator_concept = forward_iterator_tag;
|
|
using iterator_category = input_iterator_tag;
|
|
using value_type = subrange<iterator_t<_View>>;
|
|
using difference_type = range_difference_t<_View>;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __iterator() = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr __iterator(
|
|
split_view<_View, _Pattern>& __parent, iterator_t<_View> __current, subrange<iterator_t<_View>> __next)
|
|
: __parent_(std::addressof(__parent)), __cur_(std::move(__current)), __next_(std::move(__next)) {}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_View> base() const { return __cur_; }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type operator*() const { return {__cur_, __next_.begin()}; }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator++() {
|
|
__cur_ = __next_.begin();
|
|
if (__cur_ != ranges::end(__parent_->__base_)) {
|
|
__cur_ = __next_.end();
|
|
if (__cur_ == ranges::end(__parent_->__base_)) {
|
|
__trailing_empty_ = true;
|
|
__next_ = {__cur_, __cur_};
|
|
} else {
|
|
__next_ = __parent_->__find_next(__cur_);
|
|
}
|
|
} else {
|
|
__trailing_empty_ = false;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr __iterator operator++(int) {
|
|
auto __tmp = *this;
|
|
++*this;
|
|
return __tmp;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator& __x, const __iterator& __y) {
|
|
return __x.__cur_ == __y.__cur_ && __x.__trailing_empty_ == __y.__trailing_empty_;
|
|
}
|
|
};
|
|
|
|
template <forward_range _View, forward_range _Pattern>
|
|
requires view<_View> && view<_Pattern> &&
|
|
indirectly_comparable<iterator_t<_View>, iterator_t<_Pattern>, ranges::equal_to>
|
|
struct split_view<_View, _Pattern>::__sentinel {
|
|
private:
|
|
_LIBCPP_NO_UNIQUE_ADDRESS sentinel_t<_View> __end_ = sentinel_t<_View>();
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr bool __equals(const __iterator& __x, const __sentinel& __y) {
|
|
return __x.__cur_ == __y.__end_ && !__x.__trailing_empty_;
|
|
}
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI __sentinel() = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit __sentinel(split_view<_View, _Pattern>& __parent)
|
|
: __end_(ranges::end(__parent.__base_)) {}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator& __x, const __sentinel& __y) {
|
|
return __equals(__x, __y);
|
|
}
|
|
};
|
|
|
|
namespace views {
|
|
namespace __split_view {
|
|
struct __fn {
|
|
// clang-format off
|
|
template <class _Range, class _Pattern>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto operator()(_Range&& __range, _Pattern&& __pattern) const
|
|
noexcept(noexcept(split_view(std::forward<_Range>(__range), std::forward<_Pattern>(__pattern))))
|
|
-> decltype( split_view(std::forward<_Range>(__range), std::forward<_Pattern>(__pattern)))
|
|
{ return split_view(std::forward<_Range>(__range), std::forward<_Pattern>(__pattern)); }
|
|
// clang-format on
|
|
|
|
template <class _Pattern>
|
|
requires constructible_from<decay_t<_Pattern>, _Pattern>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Pattern&& __pattern) const
|
|
noexcept(is_nothrow_constructible_v<decay_t<_Pattern>, _Pattern>) {
|
|
return __range_adaptor_closure_t(std::__bind_back(*this, std::forward<_Pattern>(__pattern)));
|
|
}
|
|
};
|
|
} // namespace __split_view
|
|
|
|
inline namespace __cpo {
|
|
inline constexpr auto split = __split_view::__fn{};
|
|
} // namespace __cpo
|
|
} // namespace views
|
|
|
|
} // namespace ranges
|
|
|
|
#endif // _LIBCPP_STD_VER >= 20
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___RANGES_SPLIT_VIEW_H
|