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Proper linear time insert completion insertion

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The previous solution, ad9b090ddf, was
failing when completion was not replacing any text, as going through
SelectionList was not permitting to replace empty ranges.

Handle replacement as first a deletion then an insert to get fast
update, as having a list of forward deletions and then a list
for forwad insertion is much faster to update than a list of
interleaved delete/insert.
This commit is contained in:
Maxime Coste 2017-06-09 13:50:00 +01:00
parent f310db639c
commit 64aa6f3fb4
1 changed files with 19 additions and 8 deletions
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27
src/insert_completer.cc
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@ -3,6 +3,7 @@
#include "buffer_manager.hh"
#include "buffer_utils.hh"
#include "client.hh"
#include "changes.hh"
#include "context.hh"
#include "display_buffer.hh"
#include "face_registry.hh"
@ -373,19 +374,29 @@ 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;
ForwardChangesTracker changes_tracker;
size_t timestamp = buffer.timestamp();
Vector<BufferCoord> positions;
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
auto pos = buffer.iterator_at(changes_tracker.get_new_coord_tolerant(sel.cursor()));
if (pos.coord().column >= prefix_len and (pos + suffix_len) != buffer.end() and
std::equal(ref.begin(), ref.end(), pos - prefix_len))
ranges.push_back({(pos - prefix_len).coord(), (pos + suffix_len - 1).coord()});
{
positions.push_back(buffer.erase((pos - prefix_len).coord(),
(pos + suffix_len).coord()));
changes_tracker.update(buffer, timestamp);
}
}
if (not ranges.empty())
SelectionList{buffer, std::move(ranges)}.insert(candidate.completion, InsertMode::Replace);
selections.update();
changes_tracker = ForwardChangesTracker{};
for (auto pos : positions)
{
buffer.insert(changes_tracker.get_new_coord_tolerant(pos), candidate.completion);
changes_tracker.update(buffer, timestamp);
}
selections.update();
m_completions.end = cursor_pos;
m_completions.begin = buffer.advance(cursor_pos, -candidate.completion.length());
m_completions.timestamp = buffer.timestamp();