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Compare anchors via their fragment and their offset within it

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Co-Authored-By: Nathan Sobo <nathan@zed.dev>
Co-Authored-By: Antonio Scandurra <me@as-cii.com>
This commit is contained in:
Max Brunsfeld
2021-06-01 11:52:42 -07:00
co-authored by Nathan Sobo Antonio Scandurra
parent df13cf0a90
commit e3c07942d5
2 changed files with 25 additions and 27 deletions
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zed/src/editor/buffer.rs
+18 -5
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@@ -2030,22 +2030,28 @@ impl Buffer {
}
}
fn fragment_ix_for_anchor(&self, anchor: &Anchor) -> usize {
fn fragment_ix_for_anchor(&self, anchor: &Anchor) -> (usize, usize) {
match anchor {
Anchor::Start => 0,
Anchor::End => self.fragments.extent::<FragmentCount>(&None).0,
Anchor::Start => (0, 0),
Anchor::End => (
self.fragments.extent::<FragmentCount>(&None).0,
self.fragments.last().map_or(0, |f| f.visible_len()),
),
Anchor::Middle {
offset,
bias,
version,
} => {
let mut cursor = self.fragments.cursor::<VersionedOffset, FragmentCount>();
let mut cursor = self
.fragments
.cursor::<VersionedOffset, (VersionedOffset, FragmentCount)>();
cursor.seek(
&VersionedOffset::Offset(*offset),
bias.to_seek_bias(),
&Some(version.clone()),
);
cursor.start().0
let count = cursor.start().1;
(count.0, offset - cursor.start().0.offset())
}
}
}
@@ -2666,6 +2672,13 @@ impl<'a> sum_tree::Dimension<'a, FragmentSummary> for (VersionedOffset, usize) {
}
}
impl<'a> sum_tree::Dimension<'a, FragmentSummary> for (VersionedOffset, FragmentCount) {
fn add_summary(&mut self, summary: &'a FragmentSummary, cx: &Option<time::Global>) {
self.0.add_summary(summary, cx);
self.1 .0 += summary.count;
}
}
#[derive(Copy, Clone, Default, Debug, Eq, PartialEq, Ord, PartialOrd)]
struct FragmentCount(usize);