98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
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#include "changes.hh"
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namespace Kakoune
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{
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void ForwardChangesTracker::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 ForwardChangesTracker::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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BufferCoord ForwardChangesTracker::get_old_coord(BufferCoord 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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BufferCoord ForwardChangesTracker::get_new_coord(BufferCoord 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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BufferCoord ForwardChangesTracker::get_new_coord_tolerant(BufferCoord 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 ForwardChangesTracker::relevant(const Buffer::Change& change, BufferCoord 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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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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}
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