528 lines
16 KiB
C++
528 lines
16 KiB
C++
#include "selection.hh"
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#include "buffer_utils.hh"
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#include "changes.hh"
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#include "utf8.hh"
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namespace Kakoune
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{
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void Selection::merge_with(const Selection& other)
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{
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m_cursor = other.m_cursor;
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if (m_anchor < m_cursor)
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m_anchor = std::min(m_anchor, other.m_anchor);
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if (m_anchor > m_cursor)
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m_anchor = std::max(m_anchor, other.m_anchor);
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}
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SelectionList::SelectionList(Buffer& buffer, Selection s, size_t timestamp)
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: m_buffer(&buffer), m_selections({ std::move(s) }), m_timestamp(timestamp)
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{
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check_invariant();
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}
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SelectionList::SelectionList(Buffer& buffer, Selection s)
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: SelectionList(buffer, std::move(s), buffer.timestamp()) {}
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SelectionList::SelectionList(Buffer& buffer, Vector<Selection> s, size_t timestamp)
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: m_buffer(&buffer), m_selections(std::move(s)), m_timestamp(timestamp)
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{
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kak_assert(size() > 0);
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m_main = size() - 1;
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check_invariant();
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}
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SelectionList::SelectionList(Buffer& buffer, Vector<Selection> s)
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: SelectionList(buffer, std::move(s), buffer.timestamp()) {}
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void SelectionList::remove(size_t index)
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{
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m_selections.erase(begin() + index);
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if (index < m_main or m_main == m_selections.size())
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--m_main;
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}
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void SelectionList::set(Vector<Selection> list, size_t main)
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{
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kak_assert(main < list.size());
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m_selections = std::move(list);
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m_main = main;
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sort_and_merge_overlapping();
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update_timestamp();
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check_invariant();
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}
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namespace
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{
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BufferCoord update_insert(BufferCoord coord, BufferCoord begin, BufferCoord end)
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{
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if (coord < begin)
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return coord;
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if (begin.line == coord.line)
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coord.column += end.column - begin.column;
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coord.line += end.line - begin.line;
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kak_assert(coord.line >= 0 and coord.column >= 0);
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return coord;
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}
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/* For reference
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BufferCoord update_erase(BufferCoord coord, BufferCoord begin, BufferCoord end)
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{
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if (coord < begin)
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return coord;
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if (coord <= end)
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return begin;
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if (end.line == coord.line)
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coord.column -= end.column - begin.column;
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coord.line -= end.line - begin.line;
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kak_assert(coord.line >= 0 and coord.column >= 0);
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return coord;
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} */
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bool compare_selections(const Selection& lhs, const Selection& rhs)
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{
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const auto lmin = lhs.min(), rmin = rhs.min();
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return lmin == rmin ? lhs.max() < rhs.max() : lmin < rmin;
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}
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template<typename Iterator, typename OverlapsFunc>
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Iterator merge_overlapping(Iterator begin, Iterator end, size_t& main, OverlapsFunc overlaps)
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{
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if (begin == end)
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return begin;
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kak_assert(std::is_sorted(begin, end, compare_selections));
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size_t size = end - begin;
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size_t i = 0;
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for (size_t j = 1; j < size; ++j)
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{
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if (overlaps(begin[i], begin[j]))
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{
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begin[i].min() = std::min(begin[i].min(), begin[j].min());
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begin[i].max() = std::max(begin[i].max(), begin[j].max());
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if (i < main)
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--main;
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}
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else
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{
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++i;
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if (i != j)
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begin[i] = std::move(begin[j]);
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}
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}
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return begin + i + 1;
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}
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}
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BufferCoord& get_first(Selection& sel) { return sel.min(); }
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BufferCoord& get_last(Selection& sel) { return sel.max(); }
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Vector<Selection> compute_modified_ranges(Buffer& buffer, size_t timestamp)
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{
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Vector<Selection> ranges;
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auto changes = buffer.changes_since(timestamp);
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auto change_it = changes.begin();
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while (change_it != changes.end())
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{
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auto forward_end = forward_sorted_until(change_it, changes.end());
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auto backward_end = backward_sorted_until(change_it, changes.end());
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size_t prev_size;
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size_t dummy = 0;
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if (forward_end >= backward_end)
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{
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update_forward({ change_it, forward_end }, ranges);
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ranges.erase(merge_overlapping(ranges.begin(), ranges.end(), dummy, overlaps), ranges.end());
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prev_size = ranges.size();
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ForwardChangesTracker changes_tracker;
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for (; change_it != forward_end; ++change_it)
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{
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if (change_it->type == Buffer::Change::Insert)
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ranges.emplace_back(change_it->begin, change_it->end);
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else
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ranges.emplace_back(change_it->begin);
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changes_tracker.update(*change_it);
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}
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}
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else
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{
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update_backward({ change_it, backward_end }, ranges);
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ranges.erase(merge_overlapping(ranges.begin(), ranges.end(), dummy, overlaps), ranges.end());
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prev_size = ranges.size();
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using ReverseIt = std::reverse_iterator<const Buffer::Change*>;
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ForwardChangesTracker changes_tracker;
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for (ReverseIt it{backward_end}, end{change_it}; it != end; ++it)
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{
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auto change = *it;
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change.begin = changes_tracker.get_new_coord(change.begin);
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change.end = changes_tracker.get_new_coord(change.end);
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if (change.type == Buffer::Change::Insert)
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ranges.emplace_back(change.begin, change.end);
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else
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ranges.emplace_back(change.begin);
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changes_tracker.update(change);
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}
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change_it = backward_end;
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}
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kak_assert(std::is_sorted(ranges.begin() + prev_size, ranges.end(), compare_selections));
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std::inplace_merge(ranges.begin(), ranges.begin() + prev_size, ranges.end(), compare_selections);
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}
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const auto end_coord = buffer.end_coord();
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for (auto& range : ranges)
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{
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range.anchor() = std::min(range.anchor(), end_coord);
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range.cursor() = std::min<BufferCoord>(range.cursor(), end_coord);
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}
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auto touches = [&](const Selection& lhs, const Selection& rhs) {
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return lhs.max() == end_coord or buffer.char_next(lhs.max()) >= rhs.min();
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};
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size_t dummy = 0;
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ranges.erase(merge_overlapping(ranges.begin(), ranges.end(), dummy, touches), ranges.end());
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for (auto& sel : ranges)
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{
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kak_assert(buffer.is_valid(sel.anchor()));
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kak_assert(buffer.is_valid(sel.cursor()));
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if (buffer.is_end(sel.anchor()))
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sel.anchor() = buffer.back_coord();
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if (buffer.is_end(sel.cursor()))
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sel.cursor() = buffer.back_coord();
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if (sel.anchor() != sel.cursor())
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sel.cursor() = buffer.char_prev(sel.cursor());
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}
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return ranges;
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}
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static void clamp(Selection& sel, const Buffer& buffer)
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{
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sel.anchor() = buffer.clamp(sel.anchor());
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sel.cursor() = buffer.clamp(sel.cursor());
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}
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void update_selections(Vector<Selection>& selections, size_t& main, Buffer& buffer, size_t timestamp)
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{
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if (timestamp == buffer.timestamp())
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return;
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auto changes = buffer.changes_since(timestamp);
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auto change_it = changes.begin();
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while (change_it != changes.end())
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{
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auto forward_end = forward_sorted_until(change_it, changes.end());
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auto backward_end = backward_sorted_until(change_it, changes.end());
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if (forward_end >= backward_end)
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{
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update_forward({ change_it, forward_end }, selections);
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change_it = forward_end;
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}
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else
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{
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update_backward({ change_it, backward_end }, selections);
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change_it = backward_end;
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}
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kak_assert(std::is_sorted(selections.begin(), selections.end(),
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compare_selections));
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selections.erase(
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merge_overlapping(selections.begin(), selections.end(),
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main, overlaps), selections.end());
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}
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for (auto& sel : selections)
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clamp(sel, buffer);
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selections.erase(merge_overlapping(selections.begin(), selections.end(),
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main, overlaps), selections.end());
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}
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void SelectionList::update()
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{
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update_selections(m_selections, m_main, *m_buffer, m_timestamp);
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check_invariant();
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m_timestamp = m_buffer->timestamp();
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}
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void SelectionList::check_invariant() const
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{
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#ifdef KAK_DEBUG
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auto& buffer = this->buffer();
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kak_assert(size() > 0);
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kak_assert(m_main < size());
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const size_t timestamp = buffer.timestamp();
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kak_assert(timestamp >= m_timestamp);
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// cannot check further in that case
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if (timestamp != m_timestamp)
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return;
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const auto end_coord = buffer.end_coord();
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BufferCoord last_min{0,0};
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for (auto& sel : m_selections)
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{
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auto& min = sel.min();
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kak_assert(min >= last_min);
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last_min = min;
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const auto anchor = sel.anchor();
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kak_assert(anchor >= BufferCoord{0,0} and anchor < end_coord);
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kak_assert(anchor.column < buffer[anchor.line].length());
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const auto cursor = sel.cursor();
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kak_assert(cursor >= BufferCoord{0,0} and cursor < end_coord);
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kak_assert(cursor.column < buffer[cursor.line].length());
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}
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#endif
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}
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void SelectionList::sort()
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{
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if (size() == 1)
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return;
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const auto& main = this->main();
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const auto main_begin = main.min();
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m_main = std::count_if(begin(), end(), [&](const Selection& sel) {
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auto begin = sel.min();
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if (begin == main_begin)
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return &sel < &main;
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else
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return begin < main_begin;
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});
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std::stable_sort(begin(), end(), compare_selections);
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}
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void SelectionList::merge_overlapping()
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{
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if (size() == 1)
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return;
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m_selections.erase(Kakoune::merge_overlapping(begin(), end(),
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m_main, overlaps), end());
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}
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void SelectionList::merge_consecutive()
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{
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if (size() == 1)
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return;
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auto touches = [this](const Selection& lhs, const Selection& rhs) {
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return m_buffer->char_next(lhs.max()) >= rhs.min();
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};
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m_selections.erase(Kakoune::merge_overlapping(begin(), end(),
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m_main, touches), end());
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}
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void SelectionList::sort_and_merge_overlapping()
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{
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sort();
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merge_overlapping();
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}
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static inline void _avoid_eol(const Buffer& buffer, BufferCoord& coord)
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{
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auto column = coord.column;
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auto line = buffer[coord.line];
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if (column != 0 and column == line.length() - 1)
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coord.column = line.byte_count_to(line.char_length() - 2);
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}
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void SelectionList::avoid_eol()
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{
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update();
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for (auto& sel : m_selections)
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{
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_avoid_eol(buffer(), sel.anchor());
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_avoid_eol(buffer(), sel.cursor());
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}
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}
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BufferCoord get_insert_pos(const Buffer& buffer, const Selection& sel,
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InsertMode mode)
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{
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switch (mode)
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{
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case InsertMode::Insert:
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return sel.min();
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case InsertMode::InsertCursor:
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return sel.cursor();
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case InsertMode::Append:
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{
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// special case for end of lines, append to current line instead
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auto pos = sel.max();
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return buffer.byte_at(pos) == '\n' ? pos : buffer.char_next(pos);
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}
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case InsertMode::InsertAtLineBegin:
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return sel.min().line;
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case InsertMode::AppendAtLineEnd:
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return {sel.max().line, buffer[sel.max().line].length() - 1};
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case InsertMode::InsertAtNextLineBegin:
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return sel.max().line+1;
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default:
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kak_assert(false);
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return {};
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}
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}
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static void fix_overflowing_selections(Vector<Selection>& selections,
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const Buffer& buffer)
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{
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const BufferCoord back_coord = buffer.back_coord();
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for (auto& sel : selections)
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{
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sel.cursor() = std::min(buffer.clamp(sel.cursor()), back_coord);
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sel.anchor() = std::min(buffer.clamp(sel.anchor()), back_coord);
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}
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}
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void SelectionList::insert(ConstArrayView<String> strings, InsertMode mode,
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Vector<BufferCoord>* out_insert_pos)
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{
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if (strings.empty())
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return;
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update();
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Vector<BufferCoord> insert_pos;
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if (mode != InsertMode::Replace)
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{
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for (auto& sel : m_selections)
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insert_pos.push_back(get_insert_pos(*m_buffer, sel, mode));
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}
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ForwardChangesTracker changes_tracker;
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for (size_t index = 0; index < m_selections.size(); ++index)
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{
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auto& sel = m_selections[index];
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sel.anchor() = changes_tracker.get_new_coord_tolerant(sel.anchor());
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sel.cursor() = changes_tracker.get_new_coord_tolerant(sel.cursor());
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kak_assert(m_buffer->is_valid(sel.anchor()) and
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m_buffer->is_valid(sel.cursor()));
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const String& str = strings[std::min(index, strings.size()-1)];
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const auto pos = (mode == InsertMode::Replace) ?
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replace(*m_buffer, sel, str)
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: m_buffer->insert(changes_tracker.get_new_coord(insert_pos[index]), str);
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size_t old_timestamp = m_timestamp;
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changes_tracker.update(*m_buffer, m_timestamp);
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if (out_insert_pos)
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out_insert_pos->push_back(pos);
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if (mode == InsertMode::Replace)
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{
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auto changes = m_buffer->changes_since(old_timestamp);
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if (changes.size() < 2) // Nothing got inserted, either str was empty, or just \n at end of buffer
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sel.anchor() = sel.cursor() = m_buffer->clamp(pos);
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else
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{
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// we want min and max from *before* we do any change
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auto& min = sel.min();
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auto& max = sel.max();
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min = changes.back().begin;
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max = m_buffer->char_prev(changes.back().end);
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}
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}
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else if (not str.empty())
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{
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auto& change = m_buffer->changes_since(0).back();
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sel.anchor() = m_buffer->clamp(update_insert(sel.anchor(), change.begin, change.end));
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sel.cursor() = m_buffer->clamp(update_insert(sel.cursor(), change.begin, change.end));
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}
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}
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// We might just have been deleting text if strings were empty,
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// in which case we could have some selections pushed out of the buffer
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if (mode == InsertMode::Replace)
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fix_overflowing_selections(m_selections, *m_buffer);
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check_invariant();
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m_buffer->check_invariant();
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}
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void SelectionList::erase()
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{
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update();
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merge_overlapping();
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ForwardChangesTracker changes_tracker;
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for (auto& sel : m_selections)
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{
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sel.anchor() = changes_tracker.get_new_coord(sel.anchor());
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kak_assert(m_buffer->is_valid(sel.anchor()));
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sel.cursor() = changes_tracker.get_new_coord(sel.cursor());
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kak_assert(m_buffer->is_valid(sel.cursor()));
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auto pos = Kakoune::erase(*m_buffer, sel);
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sel.anchor() = sel.cursor() = pos;
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changes_tracker.update(*m_buffer, m_timestamp);
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}
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fix_overflowing_selections(m_selections, *m_buffer);
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m_buffer->check_invariant();
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}
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String selection_to_string(const Selection& selection)
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{
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auto& cursor = selection.cursor();
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auto& anchor = selection.anchor();
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return format("{}.{},{}.{}", anchor.line + 1, anchor.column + 1,
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cursor.line + 1, cursor.column + 1);
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}
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String selection_list_to_string(const SelectionList& selections)
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{
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return join(selections | transform(selection_to_string), ':', false);
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}
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Selection selection_from_string(StringView desc)
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{
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auto comma = find(desc, ',');
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auto dot_anchor = find(StringView{desc.begin(), comma}, '.');
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auto dot_cursor = find(StringView{comma, desc.end()}, '.');
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if (comma == desc.end() or dot_anchor == comma or dot_cursor == desc.end())
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throw runtime_error(format("'{}' does not follow <line>.<column>,<line>.<column> format", desc));
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BufferCoord anchor{str_to_int({desc.begin(), dot_anchor}) - 1,
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str_to_int({dot_anchor+1, comma}) - 1};
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BufferCoord cursor{str_to_int({comma+1, dot_cursor}) - 1,
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str_to_int({dot_cursor+1, desc.end()}) - 1};
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return Selection{anchor, cursor};
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}
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SelectionList selection_list_from_string(Buffer& buffer, StringView desc)
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{
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if (desc.empty())
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throw runtime_error{"empty selection description"};
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Vector<Selection> sels;
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for (auto sel_desc : desc | split<StringView>(':'))
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{
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auto sel = selection_from_string(sel_desc);
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clamp(sel, buffer);
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sels.push_back(sel);
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}
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size_t main = 0;
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std::sort(sels.begin(), sels.end(), compare_selections);
|
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sels.erase(merge_overlapping(sels.begin(), sels.end(), main, overlaps), sels.end());
|
|
|
|
return {buffer, std::move(sels)};
|
|
}
|
|
|
|
}
|