DynamicSelectionList: optimize updating on buffer modification
Now that we know selections are sorted, we can get the set of selections needing updating in log(n) time using a binary search, for modification not changing the line count, this makes updating selections run in log(n) instead of n.
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@ -72,62 +72,94 @@ void DynamicSelectionList::check_invariant() const
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#endif
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}
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static void update_insert(BufferIterator& it,
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const BufferCoord& begin, const BufferCoord& end)
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namespace
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{
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BufferCoord coord = it.coord();
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if (coord < begin)
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return;
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if (begin.line == coord.line)
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coord.column = end.column + coord.column - begin.column;
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coord.line += end.line - begin.line;
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template<template <bool, bool> class UpdateFunc>
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void on_buffer_change(SelectionList& sels, const BufferCoord& begin, const BufferCoord& end, LineCount end_line)
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{
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auto update_beg = std::lower_bound(sels.begin(), sels.end(), begin,
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[](const Selection& s, const BufferCoord& c) { return std::max(s.first(), s.last()).coord() < c; });
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auto update_only_line_beg = std::upper_bound(sels.begin(), sels.end(), end_line,
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[](LineCount l, const Selection& s) { return l < std::min(s.first(), s.last()).line(); });
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it = coord;
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if (update_beg != update_only_line_beg)
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{
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// for the first one, we are not sure if min < begin
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UpdateFunc<false, false>{}(update_beg->first(), begin, end);
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UpdateFunc<false, false>{}(update_beg->last(), begin, end);
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}
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for (auto it = update_beg+1; it < update_only_line_beg; ++it)
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{
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UpdateFunc<false, true>{}(it->first(), begin, end);
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UpdateFunc<false, true>{}(it->last(), begin, end);
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}
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if (end.line > begin.line)
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{
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for (auto it = update_only_line_beg; it != sels.end(); ++it)
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{
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UpdateFunc<true, true>{}(it->first(), begin, end);
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UpdateFunc<true, true>{}(it->last(), begin, end);
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}
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}
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}
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static void update_erase(BufferIterator& it,
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const BufferCoord& begin, const BufferCoord& end)
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template<bool assume_different_line, bool assume_greater_than_begin>
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struct UpdateInsert
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{
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BufferCoord coord = it.coord();
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if (coord < begin)
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return;
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if (coord <= end)
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coord = it.buffer().clamp(begin);
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else
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void operator()(BufferIterator& it,
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const BufferCoord& begin, const BufferCoord& end) const
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{
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if (end.line == coord.line)
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{
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coord.line = begin.line;
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coord.column = begin.column + coord.column - end.column;
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}
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else
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coord.line -= end.line - begin.line;
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BufferCoord coord = it.coord();
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if (assume_different_line)
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assert(begin.line < coord.line);
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if (not assume_greater_than_begin and coord < begin)
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return;
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if (not assume_different_line and begin.line == coord.line)
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coord.column = end.column + coord.column - begin.column;
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coord.line += end.line - begin.line;
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it = coord;
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}
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it = coord;
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};
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template<bool assume_different_line, bool assume_greater_than_begin>
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struct UpdateErase
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{
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void operator()(BufferIterator& it,
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const BufferCoord& begin, const BufferCoord& end) const
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{
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BufferCoord coord = it.coord();
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if (not assume_greater_than_begin and coord < begin)
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return;
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if (assume_different_line)
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assert(end.line < coord.line);
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if (not assume_different_line and coord <= end)
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coord = it.buffer().clamp(begin);
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else
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{
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if (not assume_different_line and end.line == coord.line)
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{
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coord.line = begin.line;
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coord.column = begin.column + coord.column - end.column;
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}
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else
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coord.line -= end.line - begin.line;
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}
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it = coord;
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}
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};
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}
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void DynamicSelectionList::on_insert(const BufferIterator& begin, const BufferIterator& end)
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{
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const BufferCoord begin_coord{begin.coord()};
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const BufferCoord end_coord{end.coord()};
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for (auto& sel : *this)
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{
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update_insert(sel.first(), begin_coord, end_coord);
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update_insert(sel.last(), begin_coord, end_coord);
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}
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on_buffer_change<UpdateInsert>(*this, begin.coord(), end.coord(), begin.line());
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}
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void DynamicSelectionList::on_erase(const BufferIterator& begin, const BufferIterator& end)
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{
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const BufferCoord begin_coord{begin.coord()};
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const BufferCoord end_coord{end.coord()};
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for (auto& sel : *this)
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{
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update_erase(sel.first(), begin_coord, end_coord);
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update_erase(sel.last(), begin_coord, end_coord);
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}
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on_buffer_change<UpdateErase>(*this, begin.coord(), end.coord(), end.line());
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}
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}
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