99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
#include "line_modification.hh"
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#include "buffer.hh"
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namespace Kakoune
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{
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static LineModification make_line_modif(const Buffer::Change& change)
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{
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LineCount num_added = 0, num_removed = 0;
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if (change.type == Buffer::Change::Insert)
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{
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num_added = change.end.line - change.begin.line;
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// inserted a new line at buffer end but end coord is on same line
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if (change.at_end and change.end.column != 0)
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++num_added;
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}
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else
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{
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num_removed = change.end.line - change.begin.line;
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// removed last line, but end coord is on same line
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if (change.at_end and change.end.column != 0)
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++num_removed;
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}
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// modified a line
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if (not change.at_end and
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(change.begin.column != 0 or change.end.column != 0))
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{
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++num_removed;
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++num_added;
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}
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return { change.begin.line, change.begin.line, num_removed, num_added };
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}
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Vector<LineModification> compute_line_modifications(const Buffer& buffer, size_t timestamp)
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{
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Vector<LineModification> res;
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for (auto& buf_change : buffer.changes_since(timestamp))
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{
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auto change = make_line_modif(buf_change);
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auto pos = std::upper_bound(res.begin(), res.end(), change.new_line,
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[](const LineCount& l, const LineModification& c)
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{ return l < c.new_line; });
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if (pos != res.begin())
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{
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auto& prev = *(pos-1);
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if (change.new_line <= prev.new_line + prev.num_added)
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{
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--pos;
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const LineCount removed_from_previously_added_by_pos =
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clamp(pos->new_line + pos->num_added - change.new_line,
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0_line, std::min(pos->num_added, change.num_removed));
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pos->num_removed += change.num_removed - removed_from_previously_added_by_pos;
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pos->num_added += change.num_added - removed_from_previously_added_by_pos;
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}
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else
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{
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change.old_line -= prev.diff();
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pos = res.insert(pos, change);
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}
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}
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else
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pos = res.insert(pos, change);
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auto next = pos + 1;
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auto diff = buf_change.end.line - buf_change.begin.line;
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if (buf_change.type == Buffer::Change::Erase)
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{
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auto delend = std::upper_bound(next, res.end(), change.new_line + change.num_removed,
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[](const LineCount& l, const LineModification& c)
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{ return l < c.new_line; });
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for (auto it = next; it != delend; ++it)
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{
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const LineCount removed_from_previously_added_by_it =
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std::min(it->num_added, change.new_line + change.num_removed - it->new_line);
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pos->num_removed += it->num_removed - removed_from_previously_added_by_it;
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pos->num_added += it->num_added - removed_from_previously_added_by_it;
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}
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next = res.erase(next, delend);
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for (auto it = next; it != res.end(); ++it)
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it->new_line -= diff;
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}
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else
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{
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for (auto it = next; it != res.end(); ++it)
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it->new_line += diff;
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}
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}
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return res;
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}
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}
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