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Speed up expand_unprintable by avoiding BufferIterator

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Using BufferIterator adds overhead, but we know that DisplayAtoms
cannot span multiple buffer lines and hence we can directly iterate
using char pointers.
This commit is contained in:
Maxime Coste 2022-12-15 17:09:37 +11:00
parent 20278ed52b
commit f3201cb956
1 changed files with 10 additions and 8 deletions
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18
src/highlighters.cc
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@ -1351,22 +1351,24 @@ void expand_unprintable(HighlightContext context, DisplayBuffer& display_buffer,
if (atom_it->type() != DisplayAtom::Range)
continue;
for (auto it = get_iterator(buffer, atom_it->begin()),
end = get_iterator(buffer, atom_it->end()); it < end;)
auto begin = atom_it->begin();
auto line_data = buffer[begin.line].data();
for (auto it = line_data + begin.column, end = line_data + atom_it->end().column; it < end;)
{
auto coord = it.coord();
Codepoint cp = utf8::read_codepoint(it, end);
auto next = it;
Codepoint cp = utf8::read_codepoint(next, end);
if (cp != '\n' and (cp < ' ' or cp > '~') and not iswprint((wchar_t)cp))
{
if (coord != atom_it->begin())
atom_it = ++line.split(atom_it, coord);
if (it.coord() < atom_it->end())
atom_it = line.split(atom_it, it.coord());
if (ByteCount pos(it - line_data); pos != begin.column)
atom_it = ++line.split(atom_it, {begin.line, pos});
if (ByteCount pos(next - line_data); pos < atom_it->end().column)
atom_it = line.split(atom_it, {begin.line, pos});
atom_it->replace("<EFBFBD>");
atom_it->face = error;
break;
}
it = next;
}
}
}