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Fix quadratic behaviour in when selecting an insert completion

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Use the fast, linear time SelectionList::insert algorithm instead of
an ad-hoc one that needs to call SelectionList::update after each
modification of the buffer.

Fixes #1417
This commit is contained in:
Maxime Coste 2017-06-08 09:53:46 +01:00
parent 4ab40af3a9
commit ad9b090ddf
1 changed files with 6 additions and 5 deletions
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11
src/insert_completer.cc
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@ -373,18 +373,19 @@ void InsertCompleter::select(int offset, Vector<Key>& keystrokes)
const auto suffix_len = std::max(0_byte, buffer.distance(cursor_pos, m_completions.end));
auto ref = buffer.string(m_completions.begin, m_completions.end);
Vector<Selection> ranges;
for (auto& sel : selections)
{
const auto& cursor = sel.cursor();
auto pos = buffer.iterator_at(cursor);
if (cursor.column >= prefix_len and (pos + suffix_len) != buffer.end() and
std::equal(ref.begin(), ref.end(), pos - prefix_len))
{
buffer.replace((pos - prefix_len).coord(),
(pos + suffix_len).coord(), candidate.completion);
selections.update();
}
ranges.push_back({(pos - prefix_len).coord(), (pos + suffix_len - 1).coord()});
}
if (not ranges.empty())
SelectionList{buffer, std::move(ranges)}.insert(candidate.completion, InsertMode::Replace);
selections.update();
m_completions.end = cursor_pos;
m_completions.begin = buffer.advance(cursor_pos, -candidate.completion.length());
m_completions.timestamp = buffer.timestamp();