kakoune/src/containers.hh

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