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Introduce Cursor::seek_start to compute VersionedOffset once

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This commit is contained in:
Antonio Scandurra 2021-06-10 13:42:43 +02:00
parent 71f50ce361
commit f294bfdbd9
3 changed files with 10 additions and 20 deletions
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14
zed/src/editor/buffer.rs
View file

@ -1679,9 +1679,7 @@ impl Buffer {
bias,
version,
} => {
let mut cursor = self
.fragments
.cursor::<VersionedOffset, (VersionedOffset, usize)>();
let mut cursor = self.fragments.cursor::<VersionedOffset, usize>();
cursor.seek(
&VersionedOffset::Offset(*offset),
*bias,
@ -1689,12 +1687,12 @@ impl Buffer {
);
let fragment = cursor.item().unwrap();
let overshoot = if fragment.visible {
offset - cursor.start().0.offset()
offset - cursor.seek_start().offset()
} else {
0
};
self.text_summary_for_range(0..cursor.start().1 + overshoot)
self.text_summary_for_range(0..cursor.start() + overshoot)
}
}
}
@ -1713,14 +1711,14 @@ impl Buffer {
} => {
let mut cursor = self
.fragments
.cursor::<VersionedOffset, (VersionedOffset, FragmentTextSummary)>();
.cursor::<VersionedOffset, FragmentTextSummary>();
cursor.seek(
&VersionedOffset::Offset(*offset),
*bias,
&Some(version.clone()),
);
let overshoot = offset - cursor.start().0.offset();
let summary = cursor.start().1;
let overshoot = offset - cursor.seek_start().offset();
let summary = cursor.start();
summary.visible + summary.deleted + overshoot
}
}

12
zed/src/sum_tree.rs
View file

@ -37,18 +37,6 @@ impl<'a, T: Summary> Dimension<'a, T> for () {
fn add_summary(&mut self, _: &'a T, _: &T::Context) {}
}
impl<'a, S, D1, D2> Dimension<'a, S> for (D1, D2)
where
S: Summary,
D1: Dimension<'a, S>,
D2: Dimension<'a, S>,
{
fn add_summary(&mut self, summary: &'a S, cx: &S::Context) {
self.0.add_summary(summary, cx);
self.1.add_summary(summary, cx);
}
}
pub trait SeekDimension<'a, T: Summary>: Dimension<'a, T> {
fn cmp(&self, other: &Self, cx: &T::Context) -> Ordering;
}

4
zed/src/sum_tree/cursor.rs
View file

@ -45,6 +45,10 @@ where
self.sum_dimension = U::default();
}
pub fn seek_start(&self) -> &S {
&self.seek_dimension
}
pub fn start(&self) -> &U {
&self.sum_dimension
}