352 lines
11 KiB
C++
352 lines
11 KiB
C++
#ifndef containers_hh_INCLUDED
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#define containers_hh_INCLUDED
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#include <algorithm>
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#include <utility>
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#include <iterator>
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namespace Kakoune
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{
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template<typename Factory>
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struct ContainerView { Factory factory; };
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template<typename Container, typename Factory>
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auto operator| (Container&& container, ContainerView<Factory> view) ->
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decltype(view.factory(std::forward<Container>(container)))
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{
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return view.factory(std::forward<Container>(container));
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}
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template<typename Container>
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struct ReverseView
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{
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using iterator = decltype(std::declval<Container>().rbegin());
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iterator begin() { return m_container.rbegin(); }
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iterator end() { return m_container.rend(); }
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Container m_container;
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};
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template<typename C>
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using RemoveReference = typename std::remove_reference<C>::type;
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struct ReverseFactory
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{
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template<typename Container>
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ReverseView<RemoveReference<Container>> operator()(Container&& container) const
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{
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return {std::move(container)};
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}
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template<typename Container>
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ReverseView<Container&> operator()(Container& container) const
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{
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return {container};
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}
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};
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inline ContainerView<ReverseFactory> reverse() { return {}; }
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template<typename Container>
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using IteratorOf = decltype(std::begin(std::declval<Container>()));
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template<typename Container>
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using ValueOf = typename Container::value_type;
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template<typename Container, typename Filter>
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struct FilterView
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{
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using ContainerIt = IteratorOf<Container>;
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struct Iterator : std::iterator<std::forward_iterator_tag,
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typename ContainerIt::value_type>
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{
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Iterator(const FilterView& view, ContainerIt it, ContainerIt end)
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: m_it{std::move(it)}, m_end{std::move(end)}, m_view{view}
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{
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do_filter();
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}
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auto operator*() -> decltype(*std::declval<ContainerIt>()) { return *m_it; }
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Iterator& operator++() { ++m_it; do_filter(); return *this; }
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Iterator operator++(int) { auto copy = *this; ++(*this); return copy; }
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friend bool operator==(const Iterator& lhs, const Iterator& rhs)
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{
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return lhs.m_it == rhs.m_it;
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}
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friend bool operator!=(const Iterator& lhs, const Iterator& rhs)
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{
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return not (lhs == rhs);
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}
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const ContainerIt& base() const { return m_it; }
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private:
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void do_filter()
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{
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while (m_it != m_end and not m_view.m_filter(*m_it))
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++m_it;
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}
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ContainerIt m_it;
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ContainerIt m_end;
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const FilterView& m_view;
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};
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Iterator begin() const { return {*this, std::begin(m_container), std::end(m_container)}; }
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Iterator end() const { return {*this, std::end(m_container), std::end(m_container)}; }
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Container m_container;
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Filter m_filter;
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};
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template<typename Filter>
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struct FilterFactory
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{
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template<typename Container>
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FilterView<Container&, Filter> operator()(Container& container) const { return {container, std::move(m_filter)}; }
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template<typename Container>
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FilterView<RemoveReference<Container>, Filter> operator()(Container&& container) const { return {std::move(container), std::move(m_filter)}; }
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Filter m_filter;
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};
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template<typename Filter>
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inline ContainerView<FilterFactory<Filter>> filter(Filter f) { return {{std::move(f)}}; }
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template<typename I, typename T>
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using TransformedResult = decltype(std::declval<T>()(*std::declval<I>()));
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template<typename Container, typename Transform>
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struct TransformView
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{
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using ContainerIt = IteratorOf<Container>;
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struct Iterator : std::iterator<std::forward_iterator_tag,
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typename std::remove_reference<TransformedResult<ContainerIt, Transform>>::type>
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{
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Iterator(const TransformView& view, ContainerIt it)
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: m_it{std::move(it)}, m_view{view} {}
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auto operator*() -> TransformedResult<ContainerIt, Transform> { return m_view.m_transform(*m_it); }
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Iterator& operator++() { ++m_it; return *this; }
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Iterator operator++(int) { auto copy = *this; ++m_it; return copy; }
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friend bool operator==(const Iterator& lhs, const Iterator& rhs)
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{
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return lhs.m_it == rhs.m_it;
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}
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friend bool operator!=(const Iterator& lhs, const Iterator& rhs)
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{
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return not (lhs == rhs);
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}
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ContainerIt base() const { return m_it; }
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private:
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ContainerIt m_it;
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const TransformView& m_view;
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};
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Iterator begin() const { return {*this, std::begin(m_container)}; }
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Iterator end() const { return {*this, std::end(m_container)}; }
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Container m_container;
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Transform m_transform;
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};
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template<typename Transform>
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struct TransformFactory
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{
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template<typename Container>
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TransformView<Container&, Transform> operator()(Container& container) const { return {container, std::move(m_transform)}; }
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template<typename Container>
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TransformView<RemoveReference<Container>, Transform> operator()(Container&& container) const { return {std::move(container), std::move(m_transform)}; }
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Transform m_transform;
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};
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template<typename Transform>
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inline ContainerView<TransformFactory<Transform>> transform(Transform t) { return {{std::move(t)}}; }
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template<typename Container, typename Separator = ValueOf<Container>,
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typename ValueTypeParam = void>
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struct SplitView
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{
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using ContainerIt = IteratorOf<Container>;
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using ValueType = typename std::conditional<std::is_same<void, ValueTypeParam>::value,
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std::pair<IteratorOf<Container>, IteratorOf<Container>>,
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ValueTypeParam>::type;
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struct Iterator : std::iterator<std::forward_iterator_tag, ValueType>
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{
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Iterator(ContainerIt pos, ContainerIt end, char separator)
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: pos(pos), sep(pos), end(end), separator(separator)
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{
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while (sep != end and *sep != separator)
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++sep;
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}
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Iterator& operator++() { advance(); return *this; }
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Iterator operator++(int) { auto copy = *this; advance(); return copy; }
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bool operator==(const Iterator& other) const { return pos == other.pos; }
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bool operator!=(const Iterator& other) const { return pos != other.pos; }
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ValueType operator*() { return {pos, sep}; }
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private:
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void advance()
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{
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if (sep == end)
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{
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pos = end;
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return;
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}
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pos = sep+1;
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for (sep = pos; sep != end; ++sep)
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{
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if (*sep == separator)
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break;
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}
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}
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ContainerIt pos;
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ContainerIt sep;
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ContainerIt end;
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Separator separator;
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};
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Iterator begin() const { return {std::begin(m_container), std::end(m_container), m_separator}; }
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Iterator end() const { return {std::end(m_container), std::end(m_container), m_separator}; }
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Container m_container;
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Separator m_separator;
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};
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template<typename ValueType, typename Separator>
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struct SplitViewFactory
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{
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template<typename Container>
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SplitView<RemoveReference<Container>, Separator, ValueType>
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operator()(Container&& container) const { return {std::move(container), std::move(separator)}; }
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template<typename Container>
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SplitView<Container&, Separator, ValueType>
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operator()(Container& container) const { return {container, std::move(separator)}; }
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Separator separator;
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};
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template<typename ValueType = void, typename Separator>
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ContainerView<SplitViewFactory<ValueType, Separator>> split(Separator separator) { return {{std::move(separator)}}; }
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template<typename Container1, typename Container2>
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struct ConcatView
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{
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using ContainerIt1 = decltype(begin(std::declval<Container1>()));
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using ContainerIt2 = decltype(begin(std::declval<Container2>()));
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using ValueType = typename std::common_type<typename ContainerIt1::value_type, typename ContainerIt2::value_type>::type;
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struct Iterator : std::iterator<std::forward_iterator_tag, ValueType>
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{
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static_assert(std::is_convertible<typename ContainerIt1::value_type, ValueType>::value, "");
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static_assert(std::is_convertible<typename ContainerIt2::value_type, ValueType>::value, "");
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Iterator(ContainerIt1 it1, ContainerIt1 end1, ContainerIt2 it2)
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: m_it1(std::move(it1)), m_end1(std::move(end1)),
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m_it2(std::move(it2)) {}
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ValueType operator*() { return is2() ? *m_it2 : *m_it1; }
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Iterator& operator++() { if (is2()) ++m_it2; else ++m_it1; return *this; }
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Iterator operator++(int) { auto copy = *this; ++*this; return copy; }
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friend bool operator==(const Iterator& lhs, const Iterator& rhs)
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{
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return lhs.m_it1 == rhs.m_it1 and lhs.m_end1 == rhs.m_end1 and
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lhs.m_it2 == rhs.m_it2;
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}
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friend bool operator!=(const Iterator& lhs, const Iterator& rhs)
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{
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return not (lhs == rhs);
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}
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private:
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bool is2() const { return m_it1 == m_end1; }
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ContainerIt1 m_it1;
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ContainerIt1 m_end1;
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ContainerIt2 m_it2;
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};
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ConcatView(Container1& container1, Container2& container2)
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: m_container1(container1), m_container2(container2) {}
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Iterator begin() const { return {m_container1.begin(), m_container1.end(), m_container2.begin()}; }
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Iterator end() const { return {m_container1.end(), m_container1.end(), m_container2.end()}; }
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private:
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Container1& m_container1;
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Container2& m_container2;
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};
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template<typename Container1, typename Container2>
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ConcatView<Container1, Container2> concatenated(Container1&& container1, Container2&& container2)
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{
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return {container1, container2};
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}
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// Todo: move that into the following functions once we can remove the decltype
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// return type.
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using std::begin;
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using std::end;
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template<typename Container, typename T>
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auto find(Container&& container, const T& value) -> decltype(begin(container))
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{
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return std::find(begin(container), end(container), value);
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}
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template<typename Container, typename T>
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auto find_if(Container&& container, T op) -> decltype(begin(container))
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{
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return std::find_if(begin(container), end(container), op);
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}
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template<typename Container, typename T>
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bool contains(Container&& container, const T& value)
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{
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return find(container, value) != end(container);
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}
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template<typename Container, typename T>
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bool contains_that(Container&& container, T op)
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{
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return find_if(container, op) != end(container);
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}
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template<typename Container, typename U>
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void unordered_erase(Container&& vec, U&& value)
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{
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auto it = find(vec, std::forward<U>(value));
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if (it != vec.end())
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{
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using std::swap;
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swap(vec.back(), *it);
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vec.pop_back();
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}
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}
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}
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#endif // containers_hh_INCLUDED
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