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Implement MultiBuffer::range_for_syntax_ancestor

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This commit is contained in:
Antonio Scandurra 2021-12-17 14:57:42 +01:00
parent a2ee38f37b
commit c9cbc2fe1e
1 changed files with 37 additions and 3 deletions
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40
crates/editor/src/multi_buffer.rs
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@ -1473,9 +1473,43 @@ impl MultiBufferSnapshot {
pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
let range = range.start.to_offset(self)..range.end.to_offset(self);
self.as_singleton()
.unwrap()
.range_for_syntax_ancestor(range)
let mut cursor = self.excerpts.cursor::<usize>();
cursor.seek(&range.start, Bias::Right, &());
let start_excerpt = cursor.item();
cursor.seek(&range.end, Bias::Right, &());
let end_excerpt = cursor.item();
start_excerpt
.zip(end_excerpt)
.and_then(|(start_excerpt, end_excerpt)| {
if start_excerpt.id != end_excerpt.id {
return None;
}
let excerpt_buffer_start =
start_excerpt.range.start.to_offset(&start_excerpt.buffer);
let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes
- start_excerpt.header_height as usize;
let start_after_header = cursor.start() + start_excerpt.header_height as usize;
let start_in_buffer =
excerpt_buffer_start + range.start.saturating_sub(start_after_header);
let end_in_buffer =
excerpt_buffer_start + range.end.saturating_sub(start_after_header);
let mut ancestor_buffer_range = start_excerpt
.buffer
.range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
ancestor_buffer_range.start =
cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
let start =
start_after_header + (ancestor_buffer_range.start - excerpt_buffer_start);
let end = start_after_header + (ancestor_buffer_range.end - excerpt_buffer_start);
Some(start..end)
})
}
fn buffer_snapshot_for_excerpt<'a>(