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Replace Default trait bound with a zero function on Summary/Dimension (#17975)

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This lets us provide a context when constructing the zero value. We need
it so we can require anchors to be associated with a buffer id, which
we're doing as part of simplifying the multibuffer API.

Release Notes:

- N/A

Co-authored-by: Nathan <nathan@zed.dev>
This commit is contained in:
Antonio Scandurra 2024-09-17 19:43:59 -06:00 • committed by GitHub
parent 4d074fc737
commit 2e72fd210a
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GPG key ID: B5690EEEBB952194
28 changed files with 706 additions and 349 deletions
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46
crates/git/src/diff.rs
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@ -48,6 +48,10 @@ pub struct DiffHunkSummary {
impl sum_tree::Summary for DiffHunkSummary {
type Context = text::BufferSnapshot;
fn zero(_cx: &Self::Context) -> Self {
Default::default()
}
fn add_summary(&mut self, other: &Self, buffer: &Self::Context) {
self.buffer_range.start = self
.buffer_range
@ -63,17 +67,11 @@ pub struct BufferDiff {
tree: SumTree<DiffHunk<Anchor>>,
}
impl Default for BufferDiff {
fn default() -> Self {
Self::new()
}
}
impl BufferDiff {
pub fn new() -> BufferDiff {
pub fn new(buffer: &BufferSnapshot) -> BufferDiff {
BufferDiff {
last_buffer_version: None,
tree: SumTree::new(),
tree: SumTree::new(buffer),
}
}
@ -97,11 +95,13 @@ impl BufferDiff {
range: Range<Anchor>,
buffer: &'a BufferSnapshot,
) -> impl 'a + Iterator<Item = DiffHunk<u32>> {
let mut cursor = self.tree.filter::<_, DiffHunkSummary>(move |summary| {
let before_start = summary.buffer_range.end.cmp(&range.start, buffer).is_lt();
let after_end = summary.buffer_range.start.cmp(&range.end, buffer).is_gt();
!before_start && !after_end
});
let mut cursor = self
.tree
.filter::<_, DiffHunkSummary>(buffer, move |summary| {
let before_start = summary.buffer_range.end.cmp(&range.start, buffer).is_lt();
let after_end = summary.buffer_range.start.cmp(&range.end, buffer).is_gt();
!before_start && !after_end
});
let anchor_iter = std::iter::from_fn(move || {
cursor.next(buffer);
@ -142,11 +142,13 @@ impl BufferDiff {
range: Range<Anchor>,
buffer: &'a BufferSnapshot,
) -> impl 'a + Iterator<Item = DiffHunk<u32>> {
let mut cursor = self.tree.filter::<_, DiffHunkSummary>(move |summary| {
let before_start = summary.buffer_range.end.cmp(&range.start, buffer).is_lt();
let after_end = summary.buffer_range.start.cmp(&range.end, buffer).is_gt();
!before_start && !after_end
});
let mut cursor = self
.tree
.filter::<_, DiffHunkSummary>(buffer, move |summary| {
let before_start = summary.buffer_range.end.cmp(&range.start, buffer).is_lt();
let after_end = summary.buffer_range.start.cmp(&range.end, buffer).is_gt();
!before_start && !after_end
});
std::iter::from_fn(move || {
cursor.prev(buffer);
@ -171,11 +173,11 @@ impl BufferDiff {
#[cfg(test)]
fn clear(&mut self, buffer: &text::BufferSnapshot) {
self.last_buffer_version = Some(buffer.version().clone());
self.tree = SumTree::new();
self.tree = SumTree::new(buffer);
}
pub async fn update(&mut self, diff_base: &Rope, buffer: &text::BufferSnapshot) {
let mut tree = SumTree::new();
let mut tree = SumTree::new(buffer);
let diff_base_text = diff_base.to_string();
let buffer_text = buffer.as_rope().to_string();
@ -351,7 +353,7 @@ mod tests {
.unindent();
let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), buffer_text);
let mut diff = BufferDiff::new();
let mut diff = BufferDiff::new(&buffer);
smol::block_on(diff.update(&diff_base_rope, &buffer));
assert_hunks(
diff.hunks(&buffer),
@ -412,7 +414,7 @@ mod tests {
.unindent();
let buffer = Buffer::new(0, BufferId::new(1).unwrap(), buffer_text);
let mut diff = BufferDiff::new();
let mut diff = BufferDiff::new(&buffer);
smol::block_on(diff.update(&diff_base_rope, &buffer));
assert_eq!(diff.hunks(&buffer).count(), 8);