604 lines
19 KiB
C++
604 lines
19 KiB
C++
#include "selection.hh"
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#include "utf8.hh"
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#include "buffer_utils.hh"
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namespace Kakoune
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{
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void Selection::merge_with(const Selection& range)
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{
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m_cursor = range.m_cursor;
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if (m_anchor < m_cursor)
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m_anchor = std::min(m_anchor, range.m_anchor);
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if (m_anchor > m_cursor)
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m_anchor = std::max(m_anchor, range.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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namespace
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{
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ByteCoord update_insert(ByteCoord coord, ByteCoord begin, ByteCoord 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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ByteCoord update_erase(ByteCoord coord, ByteCoord begin, ByteCoord 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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return lhs.min() < rhs.min();
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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].merge_with(begin[j]);
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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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// This tracks position changes for changes that are done
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// in a forward way (each change takes place at a position)
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// *after* the previous one.
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struct ForwardChangesTracker
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{
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ByteCoord cur_pos; // last change position at current modification
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ByteCoord old_pos; // last change position at start
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void update(const Buffer::Change& change)
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{
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kak_assert(change.begin >= cur_pos);
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if (change.type == Buffer::Change::Insert)
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{
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old_pos = get_old_coord(change.begin);
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cur_pos = change.end;
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}
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else if (change.type == Buffer::Change::Erase)
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{
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old_pos = get_old_coord(change.end);
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cur_pos = change.begin;
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}
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}
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void update(const Buffer& buffer, size_t& timestamp)
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{
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for (auto& change : buffer.changes_since(timestamp))
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update(change);
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timestamp = buffer.timestamp();
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}
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ByteCoord get_old_coord(ByteCoord coord) const
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{
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kak_assert(cur_pos <= coord);
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auto pos_change = cur_pos - old_pos;
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if (cur_pos.line == coord.line)
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{
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kak_assert(pos_change.column <= coord.column);
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coord.column -= pos_change.column;
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}
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coord.line -= pos_change.line;
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kak_assert(old_pos <= coord);
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return coord;
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}
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ByteCoord get_new_coord(ByteCoord coord) const
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{
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kak_assert(old_pos <= coord);
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auto pos_change = cur_pos - old_pos;
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if (old_pos.line == coord.line)
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{
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kak_assert(-pos_change.column <= coord.column);
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coord.column += pos_change.column;
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}
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coord.line += pos_change.line;
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kak_assert(cur_pos <= coord);
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return coord;
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}
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ByteCoord get_new_coord_tolerant(ByteCoord coord) const
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{
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if (coord < old_pos)
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return cur_pos;
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return get_new_coord(coord);
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}
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bool relevant(const Buffer::Change& change, ByteCoord old_coord) const
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{
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auto new_coord = get_new_coord_tolerant(old_coord);
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return change.type == Buffer::Change::Insert ? change.begin <= new_coord
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: change.begin < new_coord;
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}
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};
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const Buffer::Change* forward_sorted_until(const Buffer::Change* first, const Buffer::Change* last)
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{
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if (first != last) {
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const Buffer::Change* next = first;
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while (++next != last) {
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const auto& ref = first->type == Buffer::Change::Insert ? first->end : first->begin;
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if (next->begin <= ref)
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return next;
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first = next;
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}
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}
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return last;
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}
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const Buffer::Change* backward_sorted_until(const Buffer::Change* first, const Buffer::Change* last)
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{
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if (first != last) {
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const Buffer::Change* next = first;
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while (++next != last) {
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if (first->begin <= next->end)
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return next;
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first = next;
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}
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}
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return last;
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}
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void update_forward(ConstArrayView<Buffer::Change> changes, Vector<Selection>& selections)
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{
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ForwardChangesTracker changes_tracker;
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auto change_it = changes.begin();
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auto advance_while_relevant = [&](const ByteCoord& pos) mutable {
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while (change_it != changes.end() and changes_tracker.relevant(*change_it, pos))
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changes_tracker.update(*change_it++);
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};
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for (auto& sel : selections)
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{
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auto& sel_min = sel.min();
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auto& sel_max = sel.max();
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advance_while_relevant(sel_min);
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sel_min = changes_tracker.get_new_coord_tolerant(sel_min);
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advance_while_relevant(sel_max);
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sel_max = changes_tracker.get_new_coord_tolerant(sel_max);
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}
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kak_assert(std::is_sorted(selections.begin(), selections.end(), compare_selections));
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}
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void update_backward(ConstArrayView<Buffer::Change> changes, Vector<Selection>& selections)
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{
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ForwardChangesTracker changes_tracker;
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using ReverseIt = std::reverse_iterator<const Buffer::Change*>;
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auto change_it = ReverseIt(changes.end());
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auto change_end = ReverseIt(changes.begin());
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auto advance_while_relevant = [&](const ByteCoord& pos) mutable {
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while (change_it != change_end)
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{
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auto change = *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 (not changes_tracker.relevant(change, pos))
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break;
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changes_tracker.update(change);
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++change_it;
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}
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};
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for (auto& sel : selections)
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{
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auto& sel_min = sel.min();
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auto& sel_max = sel.max();
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advance_while_relevant(sel_min);
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sel_min = changes_tracker.get_new_coord_tolerant(sel_min);
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advance_while_relevant(sel_max);
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sel_max = changes_tracker.get_new_coord_tolerant(sel_max);
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}
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kak_assert(std::is_sorted(selections.begin(), selections.end(), compare_selections));
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}
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}
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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.push_back({ change_it->begin, change_it->end });
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else
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ranges.push_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.push_back({ change.begin, change.end });
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else
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ranges.push_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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const auto end_coord = buffer.end_coord();
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for (auto it = ranges.begin() + prev_size; it != ranges.end(); ++it)
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{
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it->anchor() = std::min(it->anchor(), end_coord);
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it->cursor() = std::min<ByteCoord>(it->cursor(), end_coord);
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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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ranges.erase(merge_overlapping(ranges.begin(), ranges.end(), dummy, overlaps), ranges.end());
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}
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auto touches = [&](const Selection& lhs, const Selection& rhs) {
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return 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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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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void SelectionList::update()
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{
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if (m_timestamp == m_buffer->timestamp())
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return;
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auto changes = m_buffer->changes_since(m_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 }, m_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 }, m_selections);
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change_it = backward_end;
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}
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m_selections.erase(
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merge_overlapping(m_selections.begin(), m_selections.end(),
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m_main, overlaps), m_selections.end());
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kak_assert(std::is_sorted(m_selections.begin(), m_selections.end(),
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compare_selections));
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}
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for (auto& sel : m_selections)
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{
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sel.anchor() = m_buffer->clamp(sel.anchor());
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sel.cursor() = m_buffer->clamp(sel.cursor());
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}
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m_selections.erase(merge_overlapping(begin(), end(), m_main, overlaps), end());
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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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for (size_t i = 0; i < size(); ++i)
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{
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auto& sel = (*this)[i];
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if (i+1 < size())
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kak_assert((*this)[i].min() <= (*this)[i+1].min());
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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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kak_assert(not buffer.is_end(sel.anchor()));
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kak_assert(not buffer.is_end(sel.cursor()));
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}
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#endif
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}
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void SelectionList::sort_and_merge_overlapping()
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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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m_selections.erase(merge_overlapping(begin(), end(), m_main, overlaps), end());
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}
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static inline void _avoid_eol(const Buffer& buffer, ByteCoord& 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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ByteCoord prepare_insert(Buffer& buffer, const Selection& sel, 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::Replace:
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return {}; // replace is handled specially, by calling Buffer::replace
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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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case InsertMode::OpenLineBelow:
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return buffer.insert(sel.max().line + 1, "\n");
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case InsertMode::OpenLineAbove:
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return buffer.insert(sel.min().line, "\n");
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}
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kak_assert(false);
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return {};
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}
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void SelectionList::insert(ConstArrayView<String> strings, InsertMode mode,
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bool select_inserted)
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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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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(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 = prepare_insert(*m_buffer, sel, mode);
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changes_tracker.update(*m_buffer, m_timestamp);
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const String& str = strings[std::min(index, strings.size()-1)];
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if (mode == InsertMode::Replace)
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pos = replace(*m_buffer, sel, str);
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else
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pos = m_buffer->insert(pos, str);
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auto& change = m_buffer->changes_since(m_timestamp).back();
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changes_tracker.update(*m_buffer, m_timestamp);
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m_timestamp = m_buffer->timestamp();
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if (select_inserted or mode == InsertMode::Replace)
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{
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if (str.empty())
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{
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sel.anchor() = sel.cursor() = m_buffer->clamp(pos);
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continue;
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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 = change.begin;
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max = m_buffer->char_prev(change.end);
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}
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else
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{
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if (str.empty())
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continue;
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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));
|
|
}
|
|
}
|
|
check_invariant();
|
|
m_buffer->check_invariant();
|
|
}
|
|
|
|
void SelectionList::erase()
|
|
{
|
|
update();
|
|
|
|
m_selections.erase(merge_overlapping(begin(), end(), m_main, overlaps),
|
|
end());
|
|
|
|
ForwardChangesTracker changes_tracker;
|
|
for (auto& sel : m_selections)
|
|
{
|
|
sel.anchor() = changes_tracker.get_new_coord(sel.anchor());
|
|
kak_assert(m_buffer->is_valid(sel.anchor()));
|
|
sel.cursor() = changes_tracker.get_new_coord(sel.cursor());
|
|
kak_assert(m_buffer->is_valid(sel.cursor()));
|
|
|
|
auto pos = Kakoune::erase(*m_buffer, sel);
|
|
sel.anchor() = sel.cursor() = m_buffer->clamp(pos);
|
|
changes_tracker.update(*m_buffer, m_timestamp);
|
|
}
|
|
|
|
ByteCoord back_coord = m_buffer->back_coord();
|
|
for (auto& sel : m_selections)
|
|
{
|
|
if (sel.anchor() > back_coord)
|
|
sel.anchor() = back_coord;
|
|
if (sel.cursor() > back_coord)
|
|
sel.cursor() = back_coord;
|
|
}
|
|
|
|
m_buffer->check_invariant();
|
|
}
|
|
|
|
String selection_to_string(const Selection& selection)
|
|
{
|
|
auto& cursor = selection.cursor();
|
|
auto& anchor = selection.anchor();
|
|
return format("{}.{},{}.{}", anchor.line + 1, anchor.column + 1,
|
|
cursor.line + 1, cursor.column + 1);
|
|
}
|
|
|
|
String selection_list_to_string(const SelectionList& selections)
|
|
{
|
|
return join(selections | transform([](const Selection& s)
|
|
{ return selection_to_string(s); }),
|
|
':', false);
|
|
}
|
|
|
|
Selection selection_from_string(StringView desc)
|
|
{
|
|
auto comma = find(desc, ',');
|
|
auto dot_anchor = find(StringView{desc.begin(), comma}, '.');
|
|
auto dot_cursor = find(StringView{comma, desc.end()}, '.');
|
|
|
|
if (comma == desc.end() or dot_anchor == comma or dot_cursor == desc.end())
|
|
throw runtime_error(format("'{}' does not follow <line>.<column>,<line>.<column> format", desc));
|
|
|
|
ByteCoord anchor{str_to_int({desc.begin(), dot_anchor}) - 1,
|
|
str_to_int({dot_anchor+1, comma}) - 1};
|
|
|
|
ByteCoord cursor{str_to_int({comma+1, dot_cursor}) - 1,
|
|
str_to_int({dot_cursor+1, desc.end()}) - 1};
|
|
|
|
return Selection{anchor, cursor};
|
|
}
|
|
|
|
SelectionList selection_list_from_string(Buffer& buffer, StringView desc)
|
|
{
|
|
Vector<Selection> sels;
|
|
for (auto sel_desc : desc | split<StringView>(':'))
|
|
sels.push_back(selection_from_string(sel_desc));
|
|
return {buffer, std::move(sels)};
|
|
}
|
|
|
|
}
|