1mod anchor;
2#[cfg(test)]
3mod multi_buffer_tests;
4mod position;
5
6pub use anchor::{Anchor, AnchorRangeExt, Offset};
7pub use position::{TypedOffset, TypedPoint, TypedRow};
8
9use anyhow::{Result, anyhow};
10use buffer_diff::{
11 BufferDiff, BufferDiffEvent, BufferDiffSnapshot, DiffHunkSecondaryStatus, DiffHunkStatus,
12 DiffHunkStatusKind,
13};
14use clock::ReplicaId;
15use collections::{BTreeMap, Bound, HashMap, HashSet};
16use gpui::{App, AppContext as _, Context, Entity, EntityId, EventEmitter, Task};
17use itertools::Itertools;
18use language::{
19 AutoindentMode, Buffer, BufferChunks, BufferRow, BufferSnapshot, Capability, CharClassifier,
20 CharKind, Chunk, CursorShape, DiagnosticEntry, DiskState, File, IndentSize, Language,
21 LanguageScope, OffsetRangeExt, OffsetUtf16, Outline, OutlineItem, Point, PointUtf16, Selection,
22 TextDimension, TextObject, ToOffset as _, ToPoint as _, TransactionId, TreeSitterOptions,
23 Unclipped,
24 language_settings::{IndentGuideSettings, LanguageSettings, language_settings},
25};
26
27use rope::DimensionPair;
28use smallvec::SmallVec;
29use smol::future::yield_now;
30use std::{
31 any::type_name,
32 borrow::Cow,
33 cell::{Cell, Ref, RefCell},
34 cmp, fmt,
35 future::Future,
36 io,
37 iter::{self, FromIterator},
38 mem,
39 ops::{Range, RangeBounds, Sub},
40 path::{Path, PathBuf},
41 rc::Rc,
42 str,
43 sync::Arc,
44 time::{Duration, Instant},
45};
46use sum_tree::{Bias, Cursor, Dimension, Dimensions, SumTree, Summary, TreeMap};
47use text::{
48 BufferId, Edit, LineIndent, TextSummary,
49 locator::Locator,
50 subscription::{Subscription, Topic},
51};
52use theme::SyntaxTheme;
53use util::post_inc;
54
55const NEWLINES: &[u8] = &[b'\n'; u8::MAX as usize];
56
57#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
58pub struct ExcerptId(usize);
59
60/// One or more [`Buffers`](Buffer) being edited in a single view.
61///
62/// See <https://zed.dev/features#multi-buffers>
63pub struct MultiBuffer {
64 /// A snapshot of the [`Excerpt`]s in the MultiBuffer.
65 /// Use [`MultiBuffer::snapshot`] to get a up-to-date snapshot.
66 snapshot: RefCell<MultiBufferSnapshot>,
67 /// Contains the state of the buffers being edited
68 buffers: RefCell<HashMap<BufferId, BufferState>>,
69 // only used by consumers using `set_excerpts_for_buffer`
70 excerpts_by_path: BTreeMap<PathKey, Vec<ExcerptId>>,
71 paths_by_excerpt: HashMap<ExcerptId, PathKey>,
72 diffs: HashMap<BufferId, DiffState>,
73 // all_diff_hunks_expanded: bool,
74 subscriptions: Topic,
75 /// If true, the multi-buffer only contains a single [`Buffer`] and a single [`Excerpt`]
76 singleton: bool,
77 history: History,
78 title: Option<String>,
79 capability: Capability,
80 buffer_changed_since_sync: Rc<Cell<bool>>,
81}
82
83#[derive(Clone, Debug, PartialEq, Eq)]
84pub enum MultiOrSingleBufferOffsetRange {
85 Single(Range<usize>),
86 Multi(Range<usize>),
87}
88
89#[derive(Clone, Debug, PartialEq, Eq)]
90pub enum Event {
91 ExcerptsAdded {
92 buffer: Entity<Buffer>,
93 predecessor: ExcerptId,
94 excerpts: Vec<(ExcerptId, ExcerptRange<language::Anchor>)>,
95 },
96 ExcerptsRemoved {
97 ids: Vec<ExcerptId>,
98 removed_buffer_ids: Vec<BufferId>,
99 },
100 ExcerptsExpanded {
101 ids: Vec<ExcerptId>,
102 },
103 ExcerptsEdited {
104 excerpt_ids: Vec<ExcerptId>,
105 buffer_ids: Vec<BufferId>,
106 },
107 DiffHunksToggled,
108 Edited {
109 singleton_buffer_edited: bool,
110 edited_buffer: Option<Entity<Buffer>>,
111 },
112 TransactionUndone {
113 transaction_id: TransactionId,
114 },
115 Reloaded,
116 LanguageChanged(BufferId),
117 Reparsed(BufferId),
118 Saved,
119 FileHandleChanged,
120 DirtyChanged,
121 DiagnosticsUpdated,
122 BufferDiffChanged,
123}
124
125/// A diff hunk, representing a range of consequent lines in a multibuffer.
126#[derive(Debug, Clone, PartialEq, Eq)]
127pub struct MultiBufferDiffHunk {
128 /// The row range in the multibuffer where this diff hunk appears.
129 pub row_range: Range<MultiBufferRow>,
130 /// The buffer ID that this hunk belongs to.
131 pub buffer_id: BufferId,
132 /// The range of the underlying buffer that this hunk corresponds to.
133 pub buffer_range: Range<text::Anchor>,
134 /// The excerpt that contains the diff hunk.
135 pub excerpt_id: ExcerptId,
136 /// The range within the buffer's diff base that this hunk corresponds to.
137 pub diff_base_byte_range: Range<usize>,
138 /// Whether or not this hunk also appears in the 'secondary diff'.
139 pub secondary_status: DiffHunkSecondaryStatus,
140}
141
142impl MultiBufferDiffHunk {
143 pub fn status(&self) -> DiffHunkStatus {
144 let kind = if self.buffer_range.start == self.buffer_range.end {
145 DiffHunkStatusKind::Deleted
146 } else if self.diff_base_byte_range.is_empty() {
147 DiffHunkStatusKind::Added
148 } else {
149 DiffHunkStatusKind::Modified
150 };
151 DiffHunkStatus {
152 kind,
153 secondary: self.secondary_status,
154 }
155 }
156
157 pub fn is_created_file(&self) -> bool {
158 self.diff_base_byte_range == (0..0)
159 && self.buffer_range == (text::Anchor::MIN..text::Anchor::MAX)
160 }
161
162 pub fn multi_buffer_range(&self) -> Range<Anchor> {
163 let start = Anchor::in_buffer(self.excerpt_id, self.buffer_id, self.buffer_range.start);
164 let end = Anchor::in_buffer(self.excerpt_id, self.buffer_id, self.buffer_range.end);
165 start..end
166 }
167}
168
169#[derive(PartialEq, Eq, Ord, PartialOrd, Clone, Hash, Debug)]
170pub struct PathKey {
171 namespace: u32,
172 path: Arc<Path>,
173}
174
175impl PathKey {
176 pub fn namespaced(namespace: u32, path: Arc<Path>) -> Self {
177 Self { namespace, path }
178 }
179
180 pub fn for_buffer(buffer: &Entity<Buffer>, cx: &App) -> Self {
181 if let Some(file) = buffer.read(cx).file() {
182 Self::namespaced(1, Arc::from(file.full_path(cx)))
183 } else {
184 Self::namespaced(0, Arc::from(PathBuf::from(buffer.entity_id().to_string())))
185 }
186 }
187
188 pub fn path(&self) -> &Arc<Path> {
189 &self.path
190 }
191}
192
193pub type MultiBufferPoint = Point;
194type ExcerptOffset = TypedOffset<Excerpt>;
195type ExcerptPoint = TypedPoint<Excerpt>;
196
197#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
198#[serde(transparent)]
199pub struct MultiBufferRow(pub u32);
200
201impl MultiBufferRow {
202 pub const MIN: Self = Self(0);
203 pub const MAX: Self = Self(u32::MAX);
204}
205
206impl std::ops::Add<usize> for MultiBufferRow {
207 type Output = Self;
208
209 fn add(self, rhs: usize) -> Self::Output {
210 MultiBufferRow(self.0 + rhs as u32)
211 }
212}
213
214#[derive(Clone)]
215struct History {
216 next_transaction_id: TransactionId,
217 undo_stack: Vec<Transaction>,
218 redo_stack: Vec<Transaction>,
219 transaction_depth: usize,
220 group_interval: Duration,
221}
222
223#[derive(Clone)]
224struct Transaction {
225 id: TransactionId,
226 buffer_transactions: HashMap<BufferId, text::TransactionId>,
227 first_edit_at: Instant,
228 last_edit_at: Instant,
229 suppress_grouping: bool,
230}
231
232pub trait ToOffset: 'static + fmt::Debug {
233 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
234}
235
236pub trait ToOffsetUtf16: 'static + fmt::Debug {
237 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16;
238}
239
240pub trait ToPoint: 'static + fmt::Debug {
241 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
242}
243
244pub trait ToPointUtf16: 'static + fmt::Debug {
245 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
246}
247
248struct BufferState {
249 buffer: Entity<Buffer>,
250 last_version: clock::Global,
251 last_non_text_state_update_count: usize,
252 excerpts: Vec<Locator>,
253 _subscriptions: [gpui::Subscription; 2],
254}
255
256struct DiffState {
257 diff: Entity<BufferDiff>,
258 _subscription: gpui::Subscription,
259}
260
261impl DiffState {
262 fn new(diff: Entity<BufferDiff>, cx: &mut Context<MultiBuffer>) -> Self {
263 DiffState {
264 _subscription: cx.subscribe(&diff, |this, diff, event, cx| match event {
265 BufferDiffEvent::DiffChanged { changed_range } => {
266 if let Some(changed_range) = changed_range.clone() {
267 this.buffer_diff_changed(diff, changed_range, cx)
268 }
269 cx.emit(Event::BufferDiffChanged);
270 }
271 BufferDiffEvent::LanguageChanged => this.buffer_diff_language_changed(diff, cx),
272 _ => {}
273 }),
274 diff,
275 }
276 }
277}
278
279/// The contents of a [`MultiBuffer`] at a single point in time.
280#[derive(Clone, Default)]
281pub struct MultiBufferSnapshot {
282 singleton: bool,
283 excerpts: SumTree<Excerpt>,
284 excerpt_ids: SumTree<ExcerptIdMapping>,
285 diffs: TreeMap<BufferId, BufferDiffSnapshot>,
286 diff_transforms: SumTree<DiffTransform>,
287 replaced_excerpts: TreeMap<ExcerptId, ExcerptId>,
288 trailing_excerpt_update_count: usize,
289 all_diff_hunks_expanded: bool,
290 non_text_state_update_count: usize,
291 edit_count: usize,
292 is_dirty: bool,
293 has_deleted_file: bool,
294 has_conflict: bool,
295 show_headers: bool,
296}
297
298#[derive(Debug, Clone)]
299enum DiffTransform {
300 BufferContent {
301 summary: TextSummary,
302 inserted_hunk_info: Option<DiffTransformHunkInfo>,
303 },
304 DeletedHunk {
305 summary: TextSummary,
306 buffer_id: BufferId,
307 hunk_info: DiffTransformHunkInfo,
308 base_text_byte_range: Range<usize>,
309 has_trailing_newline: bool,
310 },
311}
312
313#[derive(Clone, Copy, Debug)]
314struct DiffTransformHunkInfo {
315 excerpt_id: ExcerptId,
316 hunk_start_anchor: text::Anchor,
317 hunk_secondary_status: DiffHunkSecondaryStatus,
318}
319
320impl Eq for DiffTransformHunkInfo {}
321
322impl PartialEq for DiffTransformHunkInfo {
323 fn eq(&self, other: &DiffTransformHunkInfo) -> bool {
324 self.excerpt_id == other.excerpt_id && self.hunk_start_anchor == other.hunk_start_anchor
325 }
326}
327
328impl std::hash::Hash for DiffTransformHunkInfo {
329 fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
330 self.excerpt_id.hash(state);
331 self.hunk_start_anchor.hash(state);
332 }
333}
334
335#[derive(Clone)]
336pub struct ExcerptInfo {
337 pub id: ExcerptId,
338 pub buffer: BufferSnapshot,
339 pub buffer_id: BufferId,
340 pub range: ExcerptRange<text::Anchor>,
341 pub end_row: MultiBufferRow,
342}
343
344impl std::fmt::Debug for ExcerptInfo {
345 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
346 f.debug_struct(type_name::<Self>())
347 .field("id", &self.id)
348 .field("buffer_id", &self.buffer_id)
349 .field("path", &self.buffer.file().map(|f| f.path()))
350 .field("range", &self.range)
351 .finish()
352 }
353}
354
355/// A boundary between `Excerpt`s in a [`MultiBuffer`]
356#[derive(Debug)]
357pub struct ExcerptBoundary {
358 pub prev: Option<ExcerptInfo>,
359 pub next: ExcerptInfo,
360 /// The row in the `MultiBuffer` where the boundary is located
361 pub row: MultiBufferRow,
362}
363
364impl ExcerptBoundary {
365 pub fn starts_new_buffer(&self) -> bool {
366 match (self.prev.as_ref(), &self.next) {
367 (None, _) => true,
368 (Some(prev), next) => prev.buffer_id != next.buffer_id,
369 }
370 }
371}
372
373#[derive(Copy, Clone, Debug, PartialEq, Eq)]
374pub struct ExpandInfo {
375 pub direction: ExpandExcerptDirection,
376 pub excerpt_id: ExcerptId,
377}
378
379#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
380pub struct RowInfo {
381 pub buffer_id: Option<BufferId>,
382 pub buffer_row: Option<u32>,
383 pub multibuffer_row: Option<MultiBufferRow>,
384 pub diff_status: Option<buffer_diff::DiffHunkStatus>,
385 pub expand_info: Option<ExpandInfo>,
386}
387
388/// A slice into a [`Buffer`] that is being edited in a [`MultiBuffer`].
389#[derive(Clone)]
390struct Excerpt {
391 /// The unique identifier for this excerpt
392 id: ExcerptId,
393 /// The location of the excerpt in the [`MultiBuffer`]
394 locator: Locator,
395 /// The buffer being excerpted
396 buffer_id: BufferId,
397 /// A snapshot of the buffer being excerpted
398 buffer: BufferSnapshot,
399 /// The range of the buffer to be shown in the excerpt
400 range: ExcerptRange<text::Anchor>,
401 /// The last row in the excerpted slice of the buffer
402 max_buffer_row: BufferRow,
403 /// A summary of the text in the excerpt
404 text_summary: TextSummary,
405 has_trailing_newline: bool,
406}
407
408/// A public view into an `Excerpt` in a [`MultiBuffer`].
409///
410/// Contains methods for getting the [`Buffer`] of the excerpt,
411/// as well as mapping offsets to/from buffer and multibuffer coordinates.
412#[derive(Clone)]
413pub struct MultiBufferExcerpt<'a> {
414 excerpt: &'a Excerpt,
415 diff_transforms: sum_tree::Cursor<'a, DiffTransform, DiffTransforms<usize>>,
416 offset: usize,
417 excerpt_offset: ExcerptDimension<usize>,
418 buffer_offset: usize,
419}
420
421#[derive(Clone, Debug)]
422struct ExcerptIdMapping {
423 id: ExcerptId,
424 locator: Locator,
425}
426
427/// A range of text from a single [`Buffer`], to be shown as an `Excerpt`.
428/// These ranges are relative to the buffer itself
429#[derive(Clone, Debug, Eq, PartialEq, Hash)]
430pub struct ExcerptRange<T> {
431 /// The full range of text to be shown in the excerpt.
432 pub context: Range<T>,
433 /// The primary range of text to be highlighted in the excerpt.
434 /// In a multi-buffer search, this would be the text that matched the search
435 pub primary: Range<T>,
436}
437
438impl<T: Clone> ExcerptRange<T> {
439 pub fn new(context: Range<T>) -> Self {
440 Self {
441 context: context.clone(),
442 primary: context,
443 }
444 }
445}
446
447#[derive(Clone, Debug, Default)]
448pub struct ExcerptSummary {
449 excerpt_id: ExcerptId,
450 /// The location of the last [`Excerpt`] being summarized
451 excerpt_locator: Locator,
452 widest_line_number: u32,
453 text: TextSummary,
454}
455
456#[derive(Debug, Clone)]
457pub struct DiffTransformSummary {
458 input: TextSummary,
459 output: TextSummary,
460}
461
462#[derive(Clone)]
463pub struct MultiBufferRows<'a> {
464 point: Point,
465 is_empty: bool,
466 is_singleton: bool,
467 cursor: MultiBufferCursor<'a, Point>,
468}
469
470pub struct MultiBufferChunks<'a> {
471 excerpts: Cursor<'a, Excerpt, ExcerptOffset>,
472 diff_transforms: Cursor<'a, DiffTransform, Dimensions<usize, ExcerptOffset>>,
473 diffs: &'a TreeMap<BufferId, BufferDiffSnapshot>,
474 diff_base_chunks: Option<(BufferId, BufferChunks<'a>)>,
475 buffer_chunk: Option<Chunk<'a>>,
476 range: Range<usize>,
477 excerpt_offset_range: Range<ExcerptOffset>,
478 excerpt_chunks: Option<ExcerptChunks<'a>>,
479 language_aware: bool,
480}
481
482pub struct ReversedMultiBufferChunks<'a> {
483 cursor: MultiBufferCursor<'a, usize>,
484 current_chunks: Option<rope::Chunks<'a>>,
485 start: usize,
486 offset: usize,
487}
488
489pub struct MultiBufferBytes<'a> {
490 range: Range<usize>,
491 cursor: MultiBufferCursor<'a, usize>,
492 excerpt_bytes: Option<text::Bytes<'a>>,
493 has_trailing_newline: bool,
494 chunk: &'a [u8],
495}
496
497pub struct ReversedMultiBufferBytes<'a> {
498 range: Range<usize>,
499 chunks: ReversedMultiBufferChunks<'a>,
500 chunk: &'a [u8],
501}
502
503#[derive(Clone)]
504struct DiffTransforms<D> {
505 output_dimension: OutputDimension<D>,
506 excerpt_dimension: ExcerptDimension<D>,
507}
508
509impl<'a, D: TextDimension> Dimension<'a, DiffTransformSummary> for DiffTransforms<D> {
510 fn zero(cx: &<DiffTransformSummary as sum_tree::Summary>::Context) -> Self {
511 Self {
512 output_dimension: OutputDimension::zero(cx),
513 excerpt_dimension: <ExcerptDimension<D> as Dimension<'a, DiffTransformSummary>>::zero(
514 cx,
515 ),
516 }
517 }
518
519 fn add_summary(
520 &mut self,
521 summary: &'a DiffTransformSummary,
522 cx: &<DiffTransformSummary as sum_tree::Summary>::Context,
523 ) {
524 self.output_dimension.add_summary(summary, cx);
525 self.excerpt_dimension.add_summary(summary, cx);
526 }
527}
528
529#[derive(Clone)]
530struct MultiBufferCursor<'a, D: TextDimension> {
531 excerpts: Cursor<'a, Excerpt, ExcerptDimension<D>>,
532 diff_transforms: Cursor<'a, DiffTransform, DiffTransforms<D>>,
533 diffs: &'a TreeMap<BufferId, BufferDiffSnapshot>,
534 cached_region: Option<MultiBufferRegion<'a, D>>,
535}
536
537#[derive(Clone)]
538struct MultiBufferRegion<'a, D: TextDimension> {
539 buffer: &'a BufferSnapshot,
540 is_main_buffer: bool,
541 diff_hunk_status: Option<DiffHunkStatus>,
542 excerpt: &'a Excerpt,
543 buffer_range: Range<D>,
544 range: Range<D>,
545 has_trailing_newline: bool,
546}
547
548struct ExcerptChunks<'a> {
549 excerpt_id: ExcerptId,
550 content_chunks: BufferChunks<'a>,
551 footer_height: usize,
552}
553
554#[derive(Debug)]
555struct BufferEdit {
556 range: Range<usize>,
557 new_text: Arc<str>,
558 is_insertion: bool,
559 original_indent_column: Option<u32>,
560 excerpt_id: ExcerptId,
561}
562
563#[derive(Clone, Copy, Debug, PartialEq)]
564enum DiffChangeKind {
565 BufferEdited,
566 DiffUpdated { base_changed: bool },
567 ExpandOrCollapseHunks { expand: bool },
568}
569
570#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
571pub enum ExpandExcerptDirection {
572 Up,
573 Down,
574 UpAndDown,
575}
576
577impl ExpandExcerptDirection {
578 pub fn should_expand_up(&self) -> bool {
579 match self {
580 ExpandExcerptDirection::Up => true,
581 ExpandExcerptDirection::Down => false,
582 ExpandExcerptDirection::UpAndDown => true,
583 }
584 }
585
586 pub fn should_expand_down(&self) -> bool {
587 match self {
588 ExpandExcerptDirection::Up => false,
589 ExpandExcerptDirection::Down => true,
590 ExpandExcerptDirection::UpAndDown => true,
591 }
592 }
593}
594
595#[derive(Clone, Debug, PartialEq)]
596pub struct IndentGuide {
597 pub buffer_id: BufferId,
598 pub start_row: MultiBufferRow,
599 pub end_row: MultiBufferRow,
600 pub depth: u32,
601 pub tab_size: u32,
602 pub settings: IndentGuideSettings,
603}
604
605impl IndentGuide {
606 pub fn indent_level(&self) -> u32 {
607 self.depth * self.tab_size
608 }
609}
610
611impl MultiBuffer {
612 pub fn new(capability: Capability) -> Self {
613 Self {
614 snapshot: RefCell::new(MultiBufferSnapshot {
615 show_headers: true,
616 ..MultiBufferSnapshot::default()
617 }),
618 buffers: RefCell::default(),
619 diffs: HashMap::default(),
620 subscriptions: Topic::default(),
621 singleton: false,
622 capability,
623 title: None,
624 excerpts_by_path: Default::default(),
625 paths_by_excerpt: Default::default(),
626 buffer_changed_since_sync: Default::default(),
627 history: History {
628 next_transaction_id: clock::Lamport::default(),
629 undo_stack: Vec::new(),
630 redo_stack: Vec::new(),
631 transaction_depth: 0,
632 group_interval: Duration::from_millis(300),
633 },
634 }
635 }
636
637 pub fn without_headers(capability: Capability) -> Self {
638 Self {
639 snapshot: Default::default(),
640 buffers: Default::default(),
641 excerpts_by_path: Default::default(),
642 paths_by_excerpt: Default::default(),
643 diffs: HashMap::default(),
644 subscriptions: Default::default(),
645 singleton: false,
646 capability,
647 buffer_changed_since_sync: Default::default(),
648 history: History {
649 next_transaction_id: Default::default(),
650 undo_stack: Default::default(),
651 redo_stack: Default::default(),
652 transaction_depth: 0,
653 group_interval: Duration::from_millis(300),
654 },
655 title: Default::default(),
656 }
657 }
658
659 pub fn clone(&self, new_cx: &mut Context<Self>) -> Self {
660 let mut buffers = HashMap::default();
661 let buffer_changed_since_sync = Rc::new(Cell::new(false));
662 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
663 buffer_state.buffer.update(new_cx, |buffer, _| {
664 buffer.record_changes(Rc::downgrade(&buffer_changed_since_sync));
665 });
666 buffers.insert(
667 *buffer_id,
668 BufferState {
669 buffer: buffer_state.buffer.clone(),
670 last_version: buffer_state.last_version.clone(),
671 last_non_text_state_update_count: buffer_state.last_non_text_state_update_count,
672 excerpts: buffer_state.excerpts.clone(),
673 _subscriptions: [
674 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
675 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
676 ],
677 },
678 );
679 }
680 let mut diff_bases = HashMap::default();
681 for (buffer_id, diff) in self.diffs.iter() {
682 diff_bases.insert(*buffer_id, DiffState::new(diff.diff.clone(), new_cx));
683 }
684 Self {
685 snapshot: RefCell::new(self.snapshot.borrow().clone()),
686 buffers: RefCell::new(buffers),
687 excerpts_by_path: Default::default(),
688 paths_by_excerpt: Default::default(),
689 diffs: diff_bases,
690 subscriptions: Default::default(),
691 singleton: self.singleton,
692 capability: self.capability,
693 history: self.history.clone(),
694 title: self.title.clone(),
695 buffer_changed_since_sync,
696 }
697 }
698
699 pub fn with_title(mut self, title: String) -> Self {
700 self.title = Some(title);
701 self
702 }
703
704 pub fn read_only(&self) -> bool {
705 self.capability == Capability::ReadOnly
706 }
707
708 pub fn singleton(buffer: Entity<Buffer>, cx: &mut Context<Self>) -> Self {
709 let mut this = Self::new(buffer.read(cx).capability());
710 this.singleton = true;
711 this.push_excerpts(
712 buffer,
713 [ExcerptRange::new(text::Anchor::MIN..text::Anchor::MAX)],
714 cx,
715 );
716 this.snapshot.borrow_mut().singleton = true;
717 this
718 }
719
720 /// Returns an up-to-date snapshot of the MultiBuffer.
721 pub fn snapshot(&self, cx: &App) -> MultiBufferSnapshot {
722 self.sync(cx);
723 self.snapshot.borrow().clone()
724 }
725
726 pub fn read(&self, cx: &App) -> Ref<'_, MultiBufferSnapshot> {
727 self.sync(cx);
728 self.snapshot.borrow()
729 }
730
731 pub fn as_singleton(&self) -> Option<Entity<Buffer>> {
732 if self.singleton {
733 Some(
734 self.buffers
735 .borrow()
736 .values()
737 .next()
738 .unwrap()
739 .buffer
740 .clone(),
741 )
742 } else {
743 None
744 }
745 }
746
747 pub fn is_singleton(&self) -> bool {
748 self.singleton
749 }
750
751 pub fn subscribe(&mut self) -> Subscription {
752 self.subscriptions.subscribe()
753 }
754
755 pub fn is_dirty(&self, cx: &App) -> bool {
756 self.read(cx).is_dirty()
757 }
758
759 pub fn has_deleted_file(&self, cx: &App) -> bool {
760 self.read(cx).has_deleted_file()
761 }
762
763 pub fn has_conflict(&self, cx: &App) -> bool {
764 self.read(cx).has_conflict()
765 }
766
767 // The `is_empty` signature doesn't match what clippy expects
768 #[allow(clippy::len_without_is_empty)]
769 pub fn len(&self, cx: &App) -> usize {
770 self.read(cx).len()
771 }
772
773 pub fn is_empty(&self) -> bool {
774 self.buffers.borrow().is_empty()
775 }
776
777 pub fn symbols_containing<T: ToOffset>(
778 &self,
779 offset: T,
780 theme: Option<&SyntaxTheme>,
781 cx: &App,
782 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
783 self.read(cx).symbols_containing(offset, theme)
784 }
785
786 pub fn edit<I, S, T>(
787 &self,
788 edits: I,
789 autoindent_mode: Option<AutoindentMode>,
790 cx: &mut Context<Self>,
791 ) where
792 I: IntoIterator<Item = (Range<S>, T)>,
793 S: ToOffset,
794 T: Into<Arc<str>>,
795 {
796 let snapshot = self.read(cx);
797 let edits = edits
798 .into_iter()
799 .map(|(range, new_text)| {
800 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
801 if range.start > range.end {
802 mem::swap(&mut range.start, &mut range.end);
803 }
804 (range, new_text.into())
805 })
806 .collect::<Vec<_>>();
807
808 return edit_internal(self, snapshot, edits, autoindent_mode, cx);
809
810 // Non-generic part of edit, hoisted out to avoid blowing up LLVM IR.
811 fn edit_internal(
812 this: &MultiBuffer,
813 snapshot: Ref<MultiBufferSnapshot>,
814 edits: Vec<(Range<usize>, Arc<str>)>,
815 mut autoindent_mode: Option<AutoindentMode>,
816 cx: &mut Context<MultiBuffer>,
817 ) {
818 if this.read_only() || this.buffers.borrow().is_empty() {
819 return;
820 }
821
822 let original_indent_columns = match &mut autoindent_mode {
823 Some(AutoindentMode::Block {
824 original_indent_columns,
825 }) => mem::take(original_indent_columns),
826 _ => Default::default(),
827 };
828
829 let (buffer_edits, edited_excerpt_ids) =
830 this.convert_edits_to_buffer_edits(edits, &snapshot, &original_indent_columns);
831 drop(snapshot);
832
833 let mut buffer_ids = Vec::with_capacity(buffer_edits.len());
834 for (buffer_id, mut edits) in buffer_edits {
835 buffer_ids.push(buffer_id);
836 edits.sort_by_key(|edit| edit.range.start);
837 this.buffers.borrow()[&buffer_id]
838 .buffer
839 .update(cx, |buffer, cx| {
840 let mut edits = edits.into_iter().peekable();
841 let mut insertions = Vec::new();
842 let mut original_indent_columns = Vec::new();
843 let mut deletions = Vec::new();
844 let empty_str: Arc<str> = Arc::default();
845 while let Some(BufferEdit {
846 mut range,
847 mut new_text,
848 mut is_insertion,
849 original_indent_column,
850 excerpt_id,
851 }) = edits.next()
852 {
853 while let Some(BufferEdit {
854 range: next_range,
855 is_insertion: next_is_insertion,
856 new_text: next_new_text,
857 excerpt_id: next_excerpt_id,
858 ..
859 }) = edits.peek()
860 {
861 if range.end >= next_range.start {
862 range.end = cmp::max(next_range.end, range.end);
863 is_insertion |= *next_is_insertion;
864 if excerpt_id == *next_excerpt_id {
865 new_text = format!("{new_text}{next_new_text}").into();
866 }
867 edits.next();
868 } else {
869 break;
870 }
871 }
872
873 if is_insertion {
874 original_indent_columns.push(original_indent_column);
875 insertions.push((
876 buffer.anchor_before(range.start)
877 ..buffer.anchor_before(range.end),
878 new_text.clone(),
879 ));
880 } else if !range.is_empty() {
881 deletions.push((
882 buffer.anchor_before(range.start)
883 ..buffer.anchor_before(range.end),
884 empty_str.clone(),
885 ));
886 }
887 }
888
889 let deletion_autoindent_mode =
890 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
891 Some(AutoindentMode::Block {
892 original_indent_columns: Default::default(),
893 })
894 } else {
895 autoindent_mode.clone()
896 };
897 let insertion_autoindent_mode =
898 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
899 Some(AutoindentMode::Block {
900 original_indent_columns,
901 })
902 } else {
903 autoindent_mode.clone()
904 };
905
906 buffer.edit(deletions, deletion_autoindent_mode, cx);
907 buffer.edit(insertions, insertion_autoindent_mode, cx);
908 })
909 }
910
911 cx.emit(Event::ExcerptsEdited {
912 excerpt_ids: edited_excerpt_ids,
913 buffer_ids,
914 });
915 }
916 }
917
918 fn convert_edits_to_buffer_edits(
919 &self,
920 edits: Vec<(Range<usize>, Arc<str>)>,
921 snapshot: &MultiBufferSnapshot,
922 original_indent_columns: &[Option<u32>],
923 ) -> (HashMap<BufferId, Vec<BufferEdit>>, Vec<ExcerptId>) {
924 let mut buffer_edits: HashMap<BufferId, Vec<BufferEdit>> = Default::default();
925 let mut edited_excerpt_ids = Vec::new();
926 let mut cursor = snapshot.cursor::<usize>();
927 for (ix, (range, new_text)) in edits.into_iter().enumerate() {
928 let original_indent_column = original_indent_columns.get(ix).copied().flatten();
929
930 cursor.seek(&range.start);
931 let mut start_region = cursor.region().expect("start offset out of bounds");
932 if !start_region.is_main_buffer {
933 cursor.next();
934 if let Some(region) = cursor.region() {
935 start_region = region;
936 } else {
937 continue;
938 }
939 }
940
941 if range.end < start_region.range.start {
942 continue;
943 }
944
945 if range.end > start_region.range.end {
946 cursor.seek_forward(&range.end);
947 }
948 let mut end_region = cursor.region().expect("end offset out of bounds");
949 if !end_region.is_main_buffer {
950 cursor.prev();
951 if let Some(region) = cursor.region() {
952 end_region = region;
953 } else {
954 continue;
955 }
956 }
957
958 if range.start > end_region.range.end {
959 continue;
960 }
961
962 let start_overshoot = range.start.saturating_sub(start_region.range.start);
963 let end_overshoot = range.end.saturating_sub(end_region.range.start);
964 let buffer_start = (start_region.buffer_range.start + start_overshoot)
965 .min(start_region.buffer_range.end);
966 let buffer_end =
967 (end_region.buffer_range.start + end_overshoot).min(end_region.buffer_range.end);
968
969 if start_region.excerpt.id == end_region.excerpt.id {
970 if start_region.is_main_buffer {
971 edited_excerpt_ids.push(start_region.excerpt.id);
972 buffer_edits
973 .entry(start_region.buffer.remote_id())
974 .or_default()
975 .push(BufferEdit {
976 range: buffer_start..buffer_end,
977 new_text,
978 is_insertion: true,
979 original_indent_column,
980 excerpt_id: start_region.excerpt.id,
981 });
982 }
983 } else {
984 let start_excerpt_range = buffer_start..start_region.buffer_range.end;
985 let end_excerpt_range = end_region.buffer_range.start..buffer_end;
986 if start_region.is_main_buffer {
987 edited_excerpt_ids.push(start_region.excerpt.id);
988 buffer_edits
989 .entry(start_region.buffer.remote_id())
990 .or_default()
991 .push(BufferEdit {
992 range: start_excerpt_range,
993 new_text: new_text.clone(),
994 is_insertion: true,
995 original_indent_column,
996 excerpt_id: start_region.excerpt.id,
997 });
998 }
999 if end_region.is_main_buffer {
1000 edited_excerpt_ids.push(end_region.excerpt.id);
1001 buffer_edits
1002 .entry(end_region.buffer.remote_id())
1003 .or_default()
1004 .push(BufferEdit {
1005 range: end_excerpt_range,
1006 new_text: new_text.clone(),
1007 is_insertion: false,
1008 original_indent_column,
1009 excerpt_id: end_region.excerpt.id,
1010 });
1011 }
1012
1013 cursor.seek(&range.start);
1014 cursor.next_excerpt();
1015 while let Some(region) = cursor.region() {
1016 if region.excerpt.id == end_region.excerpt.id {
1017 break;
1018 }
1019 if region.is_main_buffer {
1020 edited_excerpt_ids.push(region.excerpt.id);
1021 buffer_edits
1022 .entry(region.buffer.remote_id())
1023 .or_default()
1024 .push(BufferEdit {
1025 range: region.buffer_range,
1026 new_text: new_text.clone(),
1027 is_insertion: false,
1028 original_indent_column,
1029 excerpt_id: region.excerpt.id,
1030 });
1031 }
1032 cursor.next_excerpt();
1033 }
1034 }
1035 }
1036 (buffer_edits, edited_excerpt_ids)
1037 }
1038
1039 pub fn autoindent_ranges<I, S>(&self, ranges: I, cx: &mut Context<Self>)
1040 where
1041 I: IntoIterator<Item = Range<S>>,
1042 S: ToOffset,
1043 {
1044 let snapshot = self.read(cx);
1045 let empty = Arc::<str>::from("");
1046 let edits = ranges
1047 .into_iter()
1048 .map(|range| {
1049 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
1050 if range.start > range.end {
1051 mem::swap(&mut range.start, &mut range.end);
1052 }
1053 (range, empty.clone())
1054 })
1055 .collect::<Vec<_>>();
1056
1057 return autoindent_ranges_internal(self, snapshot, edits, cx);
1058
1059 fn autoindent_ranges_internal(
1060 this: &MultiBuffer,
1061 snapshot: Ref<MultiBufferSnapshot>,
1062 edits: Vec<(Range<usize>, Arc<str>)>,
1063 cx: &mut Context<MultiBuffer>,
1064 ) {
1065 if this.read_only() || this.buffers.borrow().is_empty() {
1066 return;
1067 }
1068
1069 let (buffer_edits, edited_excerpt_ids) =
1070 this.convert_edits_to_buffer_edits(edits, &snapshot, &[]);
1071 drop(snapshot);
1072
1073 let mut buffer_ids = Vec::new();
1074 for (buffer_id, mut edits) in buffer_edits {
1075 buffer_ids.push(buffer_id);
1076 edits.sort_unstable_by_key(|edit| edit.range.start);
1077
1078 let mut ranges: Vec<Range<usize>> = Vec::new();
1079 for edit in edits {
1080 if let Some(last_range) = ranges.last_mut()
1081 && edit.range.start <= last_range.end
1082 {
1083 last_range.end = last_range.end.max(edit.range.end);
1084 continue;
1085 }
1086 ranges.push(edit.range);
1087 }
1088
1089 this.buffers.borrow()[&buffer_id]
1090 .buffer
1091 .update(cx, |buffer, cx| {
1092 buffer.autoindent_ranges(ranges, cx);
1093 })
1094 }
1095
1096 cx.emit(Event::ExcerptsEdited {
1097 excerpt_ids: edited_excerpt_ids,
1098 buffer_ids,
1099 });
1100 }
1101 }
1102
1103 // Inserts newlines at the given position to create an empty line, returning the start of the new line.
1104 // You can also request the insertion of empty lines above and below the line starting at the returned point.
1105 // Panics if the given position is invalid.
1106 pub fn insert_empty_line(
1107 &mut self,
1108 position: impl ToPoint,
1109 space_above: bool,
1110 space_below: bool,
1111 cx: &mut Context<Self>,
1112 ) -> Point {
1113 let multibuffer_point = position.to_point(&self.read(cx));
1114 let (buffer, buffer_point, _) = self.point_to_buffer_point(multibuffer_point, cx).unwrap();
1115 self.start_transaction(cx);
1116 let empty_line_start = buffer.update(cx, |buffer, cx| {
1117 buffer.insert_empty_line(buffer_point, space_above, space_below, cx)
1118 });
1119 self.end_transaction(cx);
1120 multibuffer_point + (empty_line_start - buffer_point)
1121 }
1122
1123 pub fn start_transaction(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1124 self.start_transaction_at(Instant::now(), cx)
1125 }
1126
1127 pub fn start_transaction_at(
1128 &mut self,
1129 now: Instant,
1130 cx: &mut Context<Self>,
1131 ) -> Option<TransactionId> {
1132 if let Some(buffer) = self.as_singleton() {
1133 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
1134 }
1135
1136 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1137 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
1138 }
1139 self.history.start_transaction(now)
1140 }
1141
1142 pub fn last_transaction_id(&self, cx: &App) -> Option<TransactionId> {
1143 if let Some(buffer) = self.as_singleton() {
1144 buffer
1145 .read(cx)
1146 .peek_undo_stack()
1147 .map(|history_entry| history_entry.transaction_id())
1148 } else {
1149 let last_transaction = self.history.undo_stack.last()?;
1150 Some(last_transaction.id)
1151 }
1152 }
1153
1154 pub fn end_transaction(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1155 self.end_transaction_at(Instant::now(), cx)
1156 }
1157
1158 pub fn end_transaction_at(
1159 &mut self,
1160 now: Instant,
1161 cx: &mut Context<Self>,
1162 ) -> Option<TransactionId> {
1163 if let Some(buffer) = self.as_singleton() {
1164 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
1165 }
1166
1167 let mut buffer_transactions = HashMap::default();
1168 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1169 if let Some(transaction_id) =
1170 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
1171 {
1172 buffer_transactions.insert(buffer.read(cx).remote_id(), transaction_id);
1173 }
1174 }
1175
1176 if self.history.end_transaction(now, buffer_transactions) {
1177 let transaction_id = self.history.group().unwrap();
1178 Some(transaction_id)
1179 } else {
1180 None
1181 }
1182 }
1183
1184 pub fn edited_ranges_for_transaction<D>(
1185 &self,
1186 transaction_id: TransactionId,
1187 cx: &App,
1188 ) -> Vec<Range<D>>
1189 where
1190 D: TextDimension + Ord + Sub<D, Output = D>,
1191 {
1192 let Some(transaction) = self.history.transaction(transaction_id) else {
1193 return Vec::new();
1194 };
1195
1196 let mut ranges = Vec::new();
1197 let snapshot = self.read(cx);
1198 let buffers = self.buffers.borrow();
1199 let mut cursor = snapshot.excerpts.cursor::<ExcerptSummary>(&());
1200
1201 for (buffer_id, buffer_transaction) in &transaction.buffer_transactions {
1202 let Some(buffer_state) = buffers.get(buffer_id) else {
1203 continue;
1204 };
1205
1206 let buffer = buffer_state.buffer.read(cx);
1207 for range in buffer.edited_ranges_for_transaction_id::<D>(*buffer_transaction) {
1208 for excerpt_id in &buffer_state.excerpts {
1209 cursor.seek(excerpt_id, Bias::Left);
1210 if let Some(excerpt) = cursor.item()
1211 && excerpt.locator == *excerpt_id
1212 {
1213 let excerpt_buffer_start = excerpt.range.context.start.summary::<D>(buffer);
1214 let excerpt_buffer_end = excerpt.range.context.end.summary::<D>(buffer);
1215 let excerpt_range = excerpt_buffer_start..excerpt_buffer_end;
1216 if excerpt_range.contains(&range.start)
1217 && excerpt_range.contains(&range.end)
1218 {
1219 let excerpt_start = D::from_text_summary(&cursor.start().text);
1220
1221 let mut start = excerpt_start;
1222 start.add_assign(&(range.start - excerpt_buffer_start));
1223 let mut end = excerpt_start;
1224 end.add_assign(&(range.end - excerpt_buffer_start));
1225
1226 ranges.push(start..end);
1227 break;
1228 }
1229 }
1230 }
1231 }
1232 }
1233
1234 ranges.sort_by_key(|range| range.start);
1235 ranges
1236 }
1237
1238 pub fn merge_transactions(
1239 &mut self,
1240 transaction: TransactionId,
1241 destination: TransactionId,
1242 cx: &mut Context<Self>,
1243 ) {
1244 if let Some(buffer) = self.as_singleton() {
1245 buffer.update(cx, |buffer, _| {
1246 buffer.merge_transactions(transaction, destination)
1247 });
1248 } else if let Some(transaction) = self.history.forget(transaction)
1249 && let Some(destination) = self.history.transaction_mut(destination)
1250 {
1251 for (buffer_id, buffer_transaction_id) in transaction.buffer_transactions {
1252 if let Some(destination_buffer_transaction_id) =
1253 destination.buffer_transactions.get(&buffer_id)
1254 {
1255 if let Some(state) = self.buffers.borrow().get(&buffer_id) {
1256 state.buffer.update(cx, |buffer, _| {
1257 buffer.merge_transactions(
1258 buffer_transaction_id,
1259 *destination_buffer_transaction_id,
1260 )
1261 });
1262 }
1263 } else {
1264 destination
1265 .buffer_transactions
1266 .insert(buffer_id, buffer_transaction_id);
1267 }
1268 }
1269 }
1270 }
1271
1272 pub fn finalize_last_transaction(&mut self, cx: &mut Context<Self>) {
1273 self.history.finalize_last_transaction();
1274 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1275 buffer.update(cx, |buffer, _| {
1276 buffer.finalize_last_transaction();
1277 });
1278 }
1279 }
1280
1281 pub fn push_transaction<'a, T>(&mut self, buffer_transactions: T, cx: &Context<Self>)
1282 where
1283 T: IntoIterator<Item = (&'a Entity<Buffer>, &'a language::Transaction)>,
1284 {
1285 self.history
1286 .push_transaction(buffer_transactions, Instant::now(), cx);
1287 self.history.finalize_last_transaction();
1288 }
1289
1290 pub fn group_until_transaction(
1291 &mut self,
1292 transaction_id: TransactionId,
1293 cx: &mut Context<Self>,
1294 ) {
1295 if let Some(buffer) = self.as_singleton() {
1296 buffer.update(cx, |buffer, _| {
1297 buffer.group_until_transaction(transaction_id)
1298 });
1299 } else {
1300 self.history.group_until(transaction_id);
1301 }
1302 }
1303
1304 pub fn set_active_selections(
1305 &self,
1306 selections: &[Selection<Anchor>],
1307 line_mode: bool,
1308 cursor_shape: CursorShape,
1309 cx: &mut Context<Self>,
1310 ) {
1311 let mut selections_by_buffer: HashMap<BufferId, Vec<Selection<text::Anchor>>> =
1312 Default::default();
1313 let snapshot = self.read(cx);
1314 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
1315 for selection in selections {
1316 let start_locator = snapshot.excerpt_locator_for_id(selection.start.excerpt_id);
1317 let end_locator = snapshot.excerpt_locator_for_id(selection.end.excerpt_id);
1318
1319 cursor.seek(&Some(start_locator), Bias::Left);
1320 while let Some(excerpt) = cursor.item() {
1321 if excerpt.locator > *end_locator {
1322 break;
1323 }
1324
1325 let mut start = excerpt.range.context.start;
1326 let mut end = excerpt.range.context.end;
1327 if excerpt.id == selection.start.excerpt_id {
1328 start = selection.start.text_anchor;
1329 }
1330 if excerpt.id == selection.end.excerpt_id {
1331 end = selection.end.text_anchor;
1332 }
1333 selections_by_buffer
1334 .entry(excerpt.buffer_id)
1335 .or_default()
1336 .push(Selection {
1337 id: selection.id,
1338 start,
1339 end,
1340 reversed: selection.reversed,
1341 goal: selection.goal,
1342 });
1343
1344 cursor.next();
1345 }
1346 }
1347
1348 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
1349 if !selections_by_buffer.contains_key(buffer_id) {
1350 buffer_state
1351 .buffer
1352 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1353 }
1354 }
1355
1356 for (buffer_id, mut selections) in selections_by_buffer {
1357 self.buffers.borrow()[&buffer_id]
1358 .buffer
1359 .update(cx, |buffer, cx| {
1360 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer));
1361 let mut selections = selections.into_iter().peekable();
1362 let merged_selections = Arc::from_iter(iter::from_fn(|| {
1363 let mut selection = selections.next()?;
1364 while let Some(next_selection) = selections.peek() {
1365 if selection.end.cmp(&next_selection.start, buffer).is_ge() {
1366 let next_selection = selections.next().unwrap();
1367 if next_selection.end.cmp(&selection.end, buffer).is_ge() {
1368 selection.end = next_selection.end;
1369 }
1370 } else {
1371 break;
1372 }
1373 }
1374 Some(selection)
1375 }));
1376 buffer.set_active_selections(merged_selections, line_mode, cursor_shape, cx);
1377 });
1378 }
1379 }
1380
1381 pub fn remove_active_selections(&self, cx: &mut Context<Self>) {
1382 for buffer in self.buffers.borrow().values() {
1383 buffer
1384 .buffer
1385 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1386 }
1387 }
1388
1389 pub fn undo(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1390 let mut transaction_id = None;
1391 if let Some(buffer) = self.as_singleton() {
1392 transaction_id = buffer.update(cx, |buffer, cx| buffer.undo(cx));
1393 } else {
1394 while let Some(transaction) = self.history.pop_undo() {
1395 let mut undone = false;
1396 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
1397 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
1398 undone |= buffer.update(cx, |buffer, cx| {
1399 let undo_to = *buffer_transaction_id;
1400 if let Some(entry) = buffer.peek_undo_stack() {
1401 *buffer_transaction_id = entry.transaction_id();
1402 }
1403 buffer.undo_to_transaction(undo_to, cx)
1404 });
1405 }
1406 }
1407
1408 if undone {
1409 transaction_id = Some(transaction.id);
1410 break;
1411 }
1412 }
1413 }
1414
1415 if let Some(transaction_id) = transaction_id {
1416 cx.emit(Event::TransactionUndone { transaction_id });
1417 }
1418
1419 transaction_id
1420 }
1421
1422 pub fn redo(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1423 if let Some(buffer) = self.as_singleton() {
1424 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
1425 }
1426
1427 while let Some(transaction) = self.history.pop_redo() {
1428 let mut redone = false;
1429 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
1430 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
1431 redone |= buffer.update(cx, |buffer, cx| {
1432 let redo_to = *buffer_transaction_id;
1433 if let Some(entry) = buffer.peek_redo_stack() {
1434 *buffer_transaction_id = entry.transaction_id();
1435 }
1436 buffer.redo_to_transaction(redo_to, cx)
1437 });
1438 }
1439 }
1440
1441 if redone {
1442 return Some(transaction.id);
1443 }
1444 }
1445
1446 None
1447 }
1448
1449 pub fn undo_transaction(&mut self, transaction_id: TransactionId, cx: &mut Context<Self>) {
1450 if let Some(buffer) = self.as_singleton() {
1451 buffer.update(cx, |buffer, cx| buffer.undo_transaction(transaction_id, cx));
1452 } else if let Some(transaction) = self.history.remove_from_undo(transaction_id) {
1453 for (buffer_id, transaction_id) in &transaction.buffer_transactions {
1454 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
1455 buffer.update(cx, |buffer, cx| {
1456 buffer.undo_transaction(*transaction_id, cx)
1457 });
1458 }
1459 }
1460 }
1461 }
1462
1463 pub fn forget_transaction(&mut self, transaction_id: TransactionId, cx: &mut Context<Self>) {
1464 if let Some(buffer) = self.as_singleton() {
1465 buffer.update(cx, |buffer, _| {
1466 buffer.forget_transaction(transaction_id);
1467 });
1468 } else if let Some(transaction) = self.history.forget(transaction_id) {
1469 for (buffer_id, buffer_transaction_id) in transaction.buffer_transactions {
1470 if let Some(state) = self.buffers.borrow_mut().get_mut(&buffer_id) {
1471 state.buffer.update(cx, |buffer, _| {
1472 buffer.forget_transaction(buffer_transaction_id);
1473 });
1474 }
1475 }
1476 }
1477 }
1478
1479 pub fn push_excerpts<O>(
1480 &mut self,
1481 buffer: Entity<Buffer>,
1482 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1483 cx: &mut Context<Self>,
1484 ) -> Vec<ExcerptId>
1485 where
1486 O: text::ToOffset,
1487 {
1488 self.insert_excerpts_after(ExcerptId::max(), buffer, ranges, cx)
1489 }
1490
1491 pub fn location_for_path(&self, path: &PathKey, cx: &App) -> Option<Anchor> {
1492 let excerpt_id = self.excerpts_by_path.get(path)?.first()?;
1493 let snapshot = self.snapshot(cx);
1494 let excerpt = snapshot.excerpt(*excerpt_id)?;
1495 Some(Anchor::in_buffer(
1496 *excerpt_id,
1497 excerpt.buffer_id,
1498 excerpt.range.context.start,
1499 ))
1500 }
1501
1502 pub fn excerpt_paths(&self) -> impl Iterator<Item = &PathKey> {
1503 self.excerpts_by_path.keys()
1504 }
1505
1506 fn expand_excerpts_with_paths(
1507 &mut self,
1508 ids: impl IntoIterator<Item = ExcerptId>,
1509 line_count: u32,
1510 direction: ExpandExcerptDirection,
1511 cx: &mut Context<Self>,
1512 ) {
1513 let grouped = ids
1514 .into_iter()
1515 .chunk_by(|id| self.paths_by_excerpt.get(id).cloned())
1516 .into_iter()
1517 .flat_map(|(k, v)| Some((k?, v.into_iter().collect::<Vec<_>>())))
1518 .collect::<Vec<_>>();
1519 let snapshot = self.snapshot(cx);
1520
1521 for (path, ids) in grouped.into_iter() {
1522 let Some(excerpt_ids) = self.excerpts_by_path.get(&path) else {
1523 continue;
1524 };
1525
1526 let ids_to_expand = HashSet::from_iter(ids);
1527 let expanded_ranges = excerpt_ids.iter().filter_map(|excerpt_id| {
1528 let excerpt = snapshot.excerpt(*excerpt_id)?;
1529
1530 let mut context = excerpt.range.context.to_point(&excerpt.buffer);
1531 if ids_to_expand.contains(excerpt_id) {
1532 match direction {
1533 ExpandExcerptDirection::Up => {
1534 context.start.row = context.start.row.saturating_sub(line_count);
1535 context.start.column = 0;
1536 }
1537 ExpandExcerptDirection::Down => {
1538 context.end.row =
1539 (context.end.row + line_count).min(excerpt.buffer.max_point().row);
1540 context.end.column = excerpt.buffer.line_len(context.end.row);
1541 }
1542 ExpandExcerptDirection::UpAndDown => {
1543 context.start.row = context.start.row.saturating_sub(line_count);
1544 context.start.column = 0;
1545 context.end.row =
1546 (context.end.row + line_count).min(excerpt.buffer.max_point().row);
1547 context.end.column = excerpt.buffer.line_len(context.end.row);
1548 }
1549 }
1550 }
1551
1552 Some(ExcerptRange {
1553 context,
1554 primary: excerpt.range.primary.to_point(&excerpt.buffer),
1555 })
1556 });
1557 let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();
1558 for range in expanded_ranges {
1559 if let Some(last_range) = merged_ranges.last_mut()
1560 && last_range.context.end >= range.context.start
1561 {
1562 last_range.context.end = range.context.end;
1563 continue;
1564 }
1565 merged_ranges.push(range)
1566 }
1567 let Some(excerpt_id) = excerpt_ids.first() else {
1568 continue;
1569 };
1570 let Some(buffer_id) = &snapshot.buffer_id_for_excerpt(*excerpt_id) else {
1571 continue;
1572 };
1573
1574 let Some(buffer) = self
1575 .buffers
1576 .borrow()
1577 .get(buffer_id)
1578 .map(|b| b.buffer.clone())
1579 else {
1580 continue;
1581 };
1582
1583 let buffer_snapshot = buffer.read(cx).snapshot();
1584 self.update_path_excerpts(path.clone(), buffer, &buffer_snapshot, merged_ranges, cx);
1585 }
1586 }
1587
1588 /// Sets excerpts, returns `true` if at least one new excerpt was added.
1589 pub fn set_excerpts_for_path(
1590 &mut self,
1591 path: PathKey,
1592 buffer: Entity<Buffer>,
1593 ranges: impl IntoIterator<Item = Range<Point>>,
1594 context_line_count: u32,
1595 cx: &mut Context<Self>,
1596 ) -> (Vec<Range<Anchor>>, bool) {
1597 let buffer_snapshot = buffer.read(cx).snapshot();
1598 let excerpt_ranges = build_excerpt_ranges(ranges, context_line_count, &buffer_snapshot);
1599
1600 let (new, counts) = Self::merge_excerpt_ranges(&excerpt_ranges);
1601 self.set_merged_excerpt_ranges_for_path(
1602 path,
1603 buffer,
1604 excerpt_ranges,
1605 &buffer_snapshot,
1606 new,
1607 counts,
1608 cx,
1609 )
1610 }
1611
1612 pub fn set_excerpt_ranges_for_path(
1613 &mut self,
1614 path: PathKey,
1615 buffer: Entity<Buffer>,
1616 buffer_snapshot: &BufferSnapshot,
1617 excerpt_ranges: Vec<ExcerptRange<Point>>,
1618 cx: &mut Context<Self>,
1619 ) -> (Vec<Range<Anchor>>, bool) {
1620 let (new, counts) = Self::merge_excerpt_ranges(&excerpt_ranges);
1621 self.set_merged_excerpt_ranges_for_path(
1622 path,
1623 buffer,
1624 excerpt_ranges,
1625 buffer_snapshot,
1626 new,
1627 counts,
1628 cx,
1629 )
1630 }
1631
1632 pub fn set_anchored_excerpts_for_path(
1633 &self,
1634 buffer: Entity<Buffer>,
1635 ranges: Vec<Range<text::Anchor>>,
1636 context_line_count: u32,
1637 cx: &mut Context<Self>,
1638 ) -> Task<Vec<Range<Anchor>>> {
1639 let buffer_snapshot = buffer.read(cx).snapshot();
1640 let path_key = PathKey::for_buffer(&buffer, cx);
1641 cx.spawn(async move |multi_buffer, cx| {
1642 let snapshot = buffer_snapshot.clone();
1643 let (excerpt_ranges, new, counts) = cx
1644 .background_spawn(async move {
1645 let ranges = ranges.into_iter().map(|range| range.to_point(&snapshot));
1646 let excerpt_ranges =
1647 build_excerpt_ranges(ranges, context_line_count, &snapshot);
1648 let (new, counts) = Self::merge_excerpt_ranges(&excerpt_ranges);
1649 (excerpt_ranges, new, counts)
1650 })
1651 .await;
1652
1653 multi_buffer
1654 .update(cx, move |multi_buffer, cx| {
1655 let (ranges, _) = multi_buffer.set_merged_excerpt_ranges_for_path(
1656 path_key,
1657 buffer,
1658 excerpt_ranges,
1659 &buffer_snapshot,
1660 new,
1661 counts,
1662 cx,
1663 );
1664 ranges
1665 })
1666 .ok()
1667 .unwrap_or_default()
1668 })
1669 }
1670
1671 /// Sets excerpts, returns `true` if at least one new excerpt was added.
1672 fn set_merged_excerpt_ranges_for_path(
1673 &mut self,
1674 path: PathKey,
1675 buffer: Entity<Buffer>,
1676 ranges: Vec<ExcerptRange<Point>>,
1677 buffer_snapshot: &BufferSnapshot,
1678 new: Vec<ExcerptRange<Point>>,
1679 counts: Vec<usize>,
1680 cx: &mut Context<Self>,
1681 ) -> (Vec<Range<Anchor>>, bool) {
1682 let (excerpt_ids, added_a_new_excerpt) =
1683 self.update_path_excerpts(path, buffer, buffer_snapshot, new, cx);
1684
1685 let mut result = Vec::new();
1686 let mut ranges = ranges.into_iter();
1687 for (excerpt_id, range_count) in excerpt_ids.into_iter().zip(counts.into_iter()) {
1688 for range in ranges.by_ref().take(range_count) {
1689 let range = Anchor::range_in_buffer(
1690 excerpt_id,
1691 buffer_snapshot.remote_id(),
1692 buffer_snapshot.anchor_before(&range.primary.start)
1693 ..buffer_snapshot.anchor_after(&range.primary.end),
1694 );
1695 result.push(range)
1696 }
1697 }
1698 (result, added_a_new_excerpt)
1699 }
1700
1701 fn merge_excerpt_ranges<'a>(
1702 expanded_ranges: impl IntoIterator<Item = &'a ExcerptRange<Point>> + 'a,
1703 ) -> (Vec<ExcerptRange<Point>>, Vec<usize>) {
1704 let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();
1705 let mut counts: Vec<usize> = Vec::new();
1706 for range in expanded_ranges {
1707 if let Some(last_range) = merged_ranges.last_mut() {
1708 debug_assert!(
1709 last_range.context.start <= range.context.start,
1710 "Last range: {last_range:?} Range: {range:?}"
1711 );
1712 if last_range.context.end >= range.context.start
1713 || last_range.context.end.row + 1 == range.context.start.row
1714 {
1715 last_range.context.end = range.context.end.max(last_range.context.end);
1716 *counts.last_mut().unwrap() += 1;
1717 continue;
1718 }
1719 }
1720 merged_ranges.push(range.clone());
1721 counts.push(1);
1722 }
1723 (merged_ranges, counts)
1724 }
1725
1726 fn update_path_excerpts(
1727 &mut self,
1728 path: PathKey,
1729 buffer: Entity<Buffer>,
1730 buffer_snapshot: &BufferSnapshot,
1731 new: Vec<ExcerptRange<Point>>,
1732 cx: &mut Context<Self>,
1733 ) -> (Vec<ExcerptId>, bool) {
1734 let mut insert_after = self
1735 .excerpts_by_path
1736 .range(..path.clone())
1737 .next_back()
1738 .map(|(_, value)| *value.last().unwrap())
1739 .unwrap_or(ExcerptId::min());
1740
1741 let existing = self
1742 .excerpts_by_path
1743 .get(&path)
1744 .cloned()
1745 .unwrap_or_default();
1746
1747 let mut new_iter = new.into_iter().peekable();
1748 let mut existing_iter = existing.into_iter().peekable();
1749
1750 let mut excerpt_ids = Vec::new();
1751 let mut to_remove = Vec::new();
1752 let mut to_insert: Vec<(ExcerptId, ExcerptRange<Point>)> = Vec::new();
1753 let mut added_a_new_excerpt = false;
1754 let snapshot = self.snapshot(cx);
1755
1756 let mut next_excerpt_id =
1757 if let Some(last_entry) = self.snapshot.borrow().excerpt_ids.last() {
1758 last_entry.id.0 + 1
1759 } else {
1760 1
1761 };
1762
1763 let mut next_excerpt_id = move || ExcerptId(post_inc(&mut next_excerpt_id));
1764
1765 let mut excerpts_cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
1766 excerpts_cursor.next();
1767
1768 loop {
1769 let new = new_iter.peek();
1770 let existing = if let Some(existing_id) = existing_iter.peek() {
1771 let locator = snapshot.excerpt_locator_for_id(*existing_id);
1772 excerpts_cursor.seek_forward(&Some(locator), Bias::Left);
1773 if let Some(excerpt) = excerpts_cursor.item() {
1774 if excerpt.buffer_id != buffer_snapshot.remote_id() {
1775 to_remove.push(*existing_id);
1776 existing_iter.next();
1777 continue;
1778 }
1779 Some((
1780 *existing_id,
1781 excerpt.range.context.to_point(buffer_snapshot),
1782 ))
1783 } else {
1784 None
1785 }
1786 } else {
1787 None
1788 };
1789
1790 if let Some((last_id, last)) = to_insert.last_mut() {
1791 if let Some(new) = new
1792 && last.context.end >= new.context.start
1793 {
1794 last.context.end = last.context.end.max(new.context.end);
1795 excerpt_ids.push(*last_id);
1796 new_iter.next();
1797 continue;
1798 }
1799 if let Some((existing_id, existing_range)) = &existing
1800 && last.context.end >= existing_range.start
1801 {
1802 last.context.end = last.context.end.max(existing_range.end);
1803 to_remove.push(*existing_id);
1804 self.snapshot
1805 .borrow_mut()
1806 .replaced_excerpts
1807 .insert(*existing_id, *last_id);
1808 existing_iter.next();
1809 continue;
1810 }
1811 }
1812
1813 match (new, existing) {
1814 (None, None) => break,
1815 (None, Some((existing_id, _))) => {
1816 existing_iter.next();
1817 to_remove.push(existing_id);
1818 continue;
1819 }
1820 (Some(_), None) => {
1821 added_a_new_excerpt = true;
1822 let new_id = next_excerpt_id();
1823 excerpt_ids.push(new_id);
1824 to_insert.push((new_id, new_iter.next().unwrap()));
1825 continue;
1826 }
1827 (Some(new), Some((_, existing_range))) => {
1828 if existing_range.end < new.context.start {
1829 let existing_id = existing_iter.next().unwrap();
1830 to_remove.push(existing_id);
1831 continue;
1832 } else if existing_range.start > new.context.end {
1833 let new_id = next_excerpt_id();
1834 excerpt_ids.push(new_id);
1835 to_insert.push((new_id, new_iter.next().unwrap()));
1836 continue;
1837 }
1838
1839 if existing_range.start == new.context.start
1840 && existing_range.end == new.context.end
1841 {
1842 self.insert_excerpts_with_ids_after(
1843 insert_after,
1844 buffer.clone(),
1845 mem::take(&mut to_insert),
1846 cx,
1847 );
1848 insert_after = existing_iter.next().unwrap();
1849 excerpt_ids.push(insert_after);
1850 new_iter.next();
1851 } else {
1852 let existing_id = existing_iter.next().unwrap();
1853 let new_id = next_excerpt_id();
1854 self.snapshot
1855 .borrow_mut()
1856 .replaced_excerpts
1857 .insert(existing_id, new_id);
1858 to_remove.push(existing_id);
1859 let mut range = new_iter.next().unwrap();
1860 range.context.start = range.context.start.min(existing_range.start);
1861 range.context.end = range.context.end.max(existing_range.end);
1862 excerpt_ids.push(new_id);
1863 to_insert.push((new_id, range));
1864 }
1865 }
1866 };
1867 }
1868
1869 self.insert_excerpts_with_ids_after(insert_after, buffer, to_insert, cx);
1870 self.remove_excerpts(to_remove, cx);
1871 if excerpt_ids.is_empty() {
1872 self.excerpts_by_path.remove(&path);
1873 } else {
1874 for excerpt_id in &excerpt_ids {
1875 self.paths_by_excerpt.insert(*excerpt_id, path.clone());
1876 }
1877 self.excerpts_by_path
1878 .insert(path, excerpt_ids.iter().dedup().cloned().collect());
1879 }
1880
1881 (excerpt_ids, added_a_new_excerpt)
1882 }
1883
1884 pub fn paths(&self) -> impl Iterator<Item = PathKey> + '_ {
1885 self.excerpts_by_path.keys().cloned()
1886 }
1887
1888 pub fn remove_excerpts_for_path(&mut self, path: PathKey, cx: &mut Context<Self>) {
1889 if let Some(to_remove) = self.excerpts_by_path.remove(&path) {
1890 self.remove_excerpts(to_remove, cx)
1891 }
1892 }
1893
1894 pub fn insert_excerpts_after<O>(
1895 &mut self,
1896 prev_excerpt_id: ExcerptId,
1897 buffer: Entity<Buffer>,
1898 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1899 cx: &mut Context<Self>,
1900 ) -> Vec<ExcerptId>
1901 where
1902 O: text::ToOffset,
1903 {
1904 let mut ids = Vec::new();
1905 let mut next_excerpt_id =
1906 if let Some(last_entry) = self.snapshot.borrow().excerpt_ids.last() {
1907 last_entry.id.0 + 1
1908 } else {
1909 1
1910 };
1911 self.insert_excerpts_with_ids_after(
1912 prev_excerpt_id,
1913 buffer,
1914 ranges.into_iter().map(|range| {
1915 let id = ExcerptId(post_inc(&mut next_excerpt_id));
1916 ids.push(id);
1917 (id, range)
1918 }),
1919 cx,
1920 );
1921 ids
1922 }
1923
1924 pub fn insert_excerpts_with_ids_after<O>(
1925 &mut self,
1926 prev_excerpt_id: ExcerptId,
1927 buffer: Entity<Buffer>,
1928 ranges: impl IntoIterator<Item = (ExcerptId, ExcerptRange<O>)>,
1929 cx: &mut Context<Self>,
1930 ) where
1931 O: text::ToOffset,
1932 {
1933 assert_eq!(self.history.transaction_depth, 0);
1934 let mut ranges = ranges.into_iter().peekable();
1935 if ranges.peek().is_none() {
1936 return Default::default();
1937 }
1938
1939 self.sync(cx);
1940
1941 let buffer_snapshot = buffer.read(cx).snapshot();
1942 let buffer_id = buffer_snapshot.remote_id();
1943
1944 let mut buffers = self.buffers.borrow_mut();
1945 let buffer_state = buffers.entry(buffer_id).or_insert_with(|| {
1946 self.buffer_changed_since_sync.replace(true);
1947 buffer.update(cx, |buffer, _| {
1948 buffer.record_changes(Rc::downgrade(&self.buffer_changed_since_sync));
1949 });
1950 BufferState {
1951 last_version: buffer_snapshot.version().clone(),
1952 last_non_text_state_update_count: buffer_snapshot.non_text_state_update_count(),
1953 excerpts: Default::default(),
1954 _subscriptions: [
1955 cx.observe(&buffer, |_, _, cx| cx.notify()),
1956 cx.subscribe(&buffer, Self::on_buffer_event),
1957 ],
1958 buffer: buffer.clone(),
1959 }
1960 });
1961
1962 let mut snapshot = self.snapshot.borrow_mut();
1963
1964 let mut prev_locator = snapshot.excerpt_locator_for_id(prev_excerpt_id).clone();
1965 let mut new_excerpt_ids = mem::take(&mut snapshot.excerpt_ids);
1966 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
1967 let mut new_excerpts = cursor.slice(&prev_locator, Bias::Right);
1968 prev_locator = cursor.start().unwrap_or(Locator::min_ref()).clone();
1969
1970 let edit_start = ExcerptOffset::new(new_excerpts.summary().text.len);
1971 new_excerpts.update_last(
1972 |excerpt| {
1973 excerpt.has_trailing_newline = true;
1974 },
1975 &(),
1976 );
1977
1978 let next_locator = if let Some(excerpt) = cursor.item() {
1979 excerpt.locator.clone()
1980 } else {
1981 Locator::max()
1982 };
1983
1984 let mut excerpts = Vec::new();
1985 while let Some((id, range)) = ranges.next() {
1986 let locator = Locator::between(&prev_locator, &next_locator);
1987 if let Err(ix) = buffer_state.excerpts.binary_search(&locator) {
1988 buffer_state.excerpts.insert(ix, locator.clone());
1989 }
1990 let range = ExcerptRange {
1991 context: buffer_snapshot.anchor_before(&range.context.start)
1992 ..buffer_snapshot.anchor_after(&range.context.end),
1993 primary: buffer_snapshot.anchor_before(&range.primary.start)
1994 ..buffer_snapshot.anchor_after(&range.primary.end),
1995 };
1996 excerpts.push((id, range.clone()));
1997 let excerpt = Excerpt::new(
1998 id,
1999 locator.clone(),
2000 buffer_id,
2001 buffer_snapshot.clone(),
2002 range,
2003 ranges.peek().is_some() || cursor.item().is_some(),
2004 );
2005 new_excerpts.push(excerpt, &());
2006 prev_locator = locator.clone();
2007
2008 if let Some(last_mapping_entry) = new_excerpt_ids.last() {
2009 assert!(id > last_mapping_entry.id, "excerpt ids must be increasing");
2010 }
2011 new_excerpt_ids.push(ExcerptIdMapping { id, locator }, &());
2012 }
2013
2014 let edit_end = ExcerptOffset::new(new_excerpts.summary().text.len);
2015
2016 let suffix = cursor.suffix();
2017 let changed_trailing_excerpt = suffix.is_empty();
2018 new_excerpts.append(suffix, &());
2019 drop(cursor);
2020 snapshot.excerpts = new_excerpts;
2021 snapshot.excerpt_ids = new_excerpt_ids;
2022 if changed_trailing_excerpt {
2023 snapshot.trailing_excerpt_update_count += 1;
2024 }
2025
2026 self.sync_diff_transforms(
2027 &mut snapshot,
2028 vec![Edit {
2029 old: edit_start..edit_start,
2030 new: edit_start..edit_end,
2031 }],
2032 DiffChangeKind::BufferEdited,
2033 );
2034 cx.emit(Event::Edited {
2035 singleton_buffer_edited: false,
2036 edited_buffer: None,
2037 });
2038 cx.emit(Event::ExcerptsAdded {
2039 buffer,
2040 predecessor: prev_excerpt_id,
2041 excerpts,
2042 });
2043 cx.notify();
2044 }
2045
2046 pub fn clear(&mut self, cx: &mut Context<Self>) {
2047 self.sync(cx);
2048 let ids = self.excerpt_ids();
2049 let removed_buffer_ids = self
2050 .buffers
2051 .borrow_mut()
2052 .drain()
2053 .map(|(id, _)| id)
2054 .collect();
2055 self.excerpts_by_path.clear();
2056 self.paths_by_excerpt.clear();
2057 let mut snapshot = self.snapshot.borrow_mut();
2058 let start = ExcerptOffset::new(0);
2059 let prev_len = ExcerptOffset::new(snapshot.excerpts.summary().text.len);
2060 snapshot.excerpts = Default::default();
2061 snapshot.trailing_excerpt_update_count += 1;
2062 snapshot.is_dirty = false;
2063 snapshot.has_deleted_file = false;
2064 snapshot.has_conflict = false;
2065 snapshot.replaced_excerpts.clear();
2066
2067 self.sync_diff_transforms(
2068 &mut snapshot,
2069 vec![Edit {
2070 old: start..prev_len,
2071 new: start..start,
2072 }],
2073 DiffChangeKind::BufferEdited,
2074 );
2075 cx.emit(Event::Edited {
2076 singleton_buffer_edited: false,
2077 edited_buffer: None,
2078 });
2079 cx.emit(Event::ExcerptsRemoved {
2080 ids,
2081 removed_buffer_ids,
2082 });
2083 cx.notify();
2084 }
2085
2086 pub fn excerpts_for_buffer(
2087 &self,
2088 buffer_id: BufferId,
2089 cx: &App,
2090 ) -> Vec<(ExcerptId, ExcerptRange<text::Anchor>)> {
2091 let mut excerpts = Vec::new();
2092 let snapshot = self.read(cx);
2093 let buffers = self.buffers.borrow();
2094 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
2095 for locator in buffers
2096 .get(&buffer_id)
2097 .map(|state| &state.excerpts)
2098 .into_iter()
2099 .flatten()
2100 {
2101 cursor.seek_forward(&Some(locator), Bias::Left);
2102 if let Some(excerpt) = cursor.item()
2103 && excerpt.locator == *locator
2104 {
2105 excerpts.push((excerpt.id, excerpt.range.clone()));
2106 }
2107 }
2108
2109 excerpts
2110 }
2111
2112 pub fn excerpt_ranges_for_buffer(&self, buffer_id: BufferId, cx: &App) -> Vec<Range<Point>> {
2113 let snapshot = self.read(cx);
2114 let buffers = self.buffers.borrow();
2115 let mut excerpts = snapshot
2116 .excerpts
2117 .cursor::<Dimensions<Option<&Locator>, ExcerptDimension<Point>>>(&());
2118 let mut diff_transforms = snapshot
2119 .diff_transforms
2120 .cursor::<Dimensions<ExcerptDimension<Point>, OutputDimension<Point>>>(&());
2121 diff_transforms.next();
2122 let locators = buffers
2123 .get(&buffer_id)
2124 .into_iter()
2125 .flat_map(|state| &state.excerpts);
2126 let mut result = Vec::new();
2127 for locator in locators {
2128 excerpts.seek_forward(&Some(locator), Bias::Left);
2129 if let Some(excerpt) = excerpts.item()
2130 && excerpt.locator == *locator
2131 {
2132 let excerpt_start = excerpts.start().1.clone();
2133 let excerpt_end = ExcerptDimension(excerpt_start.0 + excerpt.text_summary.lines);
2134
2135 diff_transforms.seek_forward(&excerpt_start, Bias::Left);
2136 let overshoot = excerpt_start.0 - diff_transforms.start().0.0;
2137 let start = diff_transforms.start().1.0 + overshoot;
2138
2139 diff_transforms.seek_forward(&excerpt_end, Bias::Right);
2140 let overshoot = excerpt_end.0 - diff_transforms.start().0.0;
2141 let end = diff_transforms.start().1.0 + overshoot;
2142
2143 result.push(start..end)
2144 }
2145 }
2146 result
2147 }
2148
2149 pub fn excerpt_buffer_ids(&self) -> Vec<BufferId> {
2150 self.snapshot
2151 .borrow()
2152 .excerpts
2153 .iter()
2154 .map(|entry| entry.buffer_id)
2155 .collect()
2156 }
2157
2158 pub fn excerpt_ids(&self) -> Vec<ExcerptId> {
2159 self.snapshot
2160 .borrow()
2161 .excerpts
2162 .iter()
2163 .map(|entry| entry.id)
2164 .collect()
2165 }
2166
2167 pub fn excerpt_containing(
2168 &self,
2169 position: impl ToOffset,
2170 cx: &App,
2171 ) -> Option<(ExcerptId, Entity<Buffer>, Range<text::Anchor>)> {
2172 let snapshot = self.read(cx);
2173 let offset = position.to_offset(&snapshot);
2174
2175 let mut cursor = snapshot.cursor::<usize>();
2176 cursor.seek(&offset);
2177 cursor
2178 .excerpt()
2179 .or_else(|| snapshot.excerpts.last())
2180 .map(|excerpt| {
2181 (
2182 excerpt.id,
2183 self.buffers
2184 .borrow()
2185 .get(&excerpt.buffer_id)
2186 .unwrap()
2187 .buffer
2188 .clone(),
2189 excerpt.range.context.clone(),
2190 )
2191 })
2192 }
2193
2194 pub fn buffer_for_anchor(&self, anchor: Anchor, cx: &App) -> Option<Entity<Buffer>> {
2195 if let Some(buffer_id) = anchor.buffer_id {
2196 self.buffer(buffer_id)
2197 } else {
2198 let (_, buffer, _) = self.excerpt_containing(anchor, cx)?;
2199 Some(buffer)
2200 }
2201 }
2202
2203 // If point is at the end of the buffer, the last excerpt is returned
2204 pub fn point_to_buffer_offset<T: ToOffset>(
2205 &self,
2206 point: T,
2207 cx: &App,
2208 ) -> Option<(Entity<Buffer>, usize)> {
2209 let snapshot = self.read(cx);
2210 let (buffer, offset) = snapshot.point_to_buffer_offset(point)?;
2211 Some((
2212 self.buffers
2213 .borrow()
2214 .get(&buffer.remote_id())?
2215 .buffer
2216 .clone(),
2217 offset,
2218 ))
2219 }
2220
2221 // If point is at the end of the buffer, the last excerpt is returned
2222 pub fn point_to_buffer_point<T: ToPoint>(
2223 &self,
2224 point: T,
2225 cx: &App,
2226 ) -> Option<(Entity<Buffer>, Point, ExcerptId)> {
2227 let snapshot = self.read(cx);
2228 let (buffer, point, is_main_buffer) =
2229 snapshot.point_to_buffer_point(point.to_point(&snapshot))?;
2230 Some((
2231 self.buffers
2232 .borrow()
2233 .get(&buffer.remote_id())?
2234 .buffer
2235 .clone(),
2236 point,
2237 is_main_buffer,
2238 ))
2239 }
2240
2241 pub fn buffer_point_to_anchor(
2242 &self,
2243 buffer: &Entity<Buffer>,
2244 point: Point,
2245 cx: &App,
2246 ) -> Option<Anchor> {
2247 let mut found = None;
2248 let snapshot = buffer.read(cx).snapshot();
2249 for (excerpt_id, range) in self.excerpts_for_buffer(snapshot.remote_id(), cx) {
2250 let start = range.context.start.to_point(&snapshot);
2251 let end = range.context.end.to_point(&snapshot);
2252 if start <= point && point < end {
2253 found = Some((snapshot.clip_point(point, Bias::Left), excerpt_id));
2254 break;
2255 }
2256 if point < start {
2257 found = Some((start, excerpt_id));
2258 }
2259 if point > end {
2260 found = Some((end, excerpt_id));
2261 }
2262 }
2263
2264 found.map(|(point, excerpt_id)| {
2265 let text_anchor = snapshot.anchor_after(point);
2266 Anchor::in_buffer(excerpt_id, snapshot.remote_id(), text_anchor)
2267 })
2268 }
2269
2270 pub fn remove_excerpts(
2271 &mut self,
2272 excerpt_ids: impl IntoIterator<Item = ExcerptId>,
2273 cx: &mut Context<Self>,
2274 ) {
2275 self.sync(cx);
2276 let ids = excerpt_ids.into_iter().collect::<Vec<_>>();
2277 if ids.is_empty() {
2278 return;
2279 }
2280
2281 let mut buffers = self.buffers.borrow_mut();
2282 let mut snapshot = self.snapshot.borrow_mut();
2283 let mut new_excerpts = SumTree::default();
2284 let mut cursor = snapshot
2285 .excerpts
2286 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(&());
2287 let mut edits = Vec::new();
2288 let mut excerpt_ids = ids.iter().copied().peekable();
2289 let mut removed_buffer_ids = Vec::new();
2290
2291 while let Some(excerpt_id) = excerpt_ids.next() {
2292 self.paths_by_excerpt.remove(&excerpt_id);
2293 // Seek to the next excerpt to remove, preserving any preceding excerpts.
2294 let locator = snapshot.excerpt_locator_for_id(excerpt_id);
2295 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left), &());
2296
2297 if let Some(mut excerpt) = cursor.item() {
2298 if excerpt.id != excerpt_id {
2299 continue;
2300 }
2301 let mut old_start = cursor.start().1;
2302
2303 // Skip over the removed excerpt.
2304 'remove_excerpts: loop {
2305 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
2306 buffer_state.excerpts.retain(|l| l != &excerpt.locator);
2307 if buffer_state.excerpts.is_empty() {
2308 log::debug!(
2309 "removing buffer and diff for buffer {}",
2310 excerpt.buffer_id
2311 );
2312 buffers.remove(&excerpt.buffer_id);
2313 removed_buffer_ids.push(excerpt.buffer_id);
2314 }
2315 }
2316 cursor.next();
2317
2318 // Skip over any subsequent excerpts that are also removed.
2319 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
2320 let next_locator = snapshot.excerpt_locator_for_id(next_excerpt_id);
2321 if let Some(next_excerpt) = cursor.item()
2322 && next_excerpt.locator == *next_locator
2323 {
2324 excerpt_ids.next();
2325 excerpt = next_excerpt;
2326 continue 'remove_excerpts;
2327 }
2328 }
2329
2330 break;
2331 }
2332
2333 // When removing the last excerpt, remove the trailing newline from
2334 // the previous excerpt.
2335 if cursor.item().is_none() && old_start.value > 0 {
2336 old_start.value -= 1;
2337 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
2338 }
2339
2340 // Push an edit for the removal of this run of excerpts.
2341 let old_end = cursor.start().1;
2342 let new_start = ExcerptOffset::new(new_excerpts.summary().text.len);
2343 edits.push(Edit {
2344 old: old_start..old_end,
2345 new: new_start..new_start,
2346 });
2347 }
2348 }
2349 let suffix = cursor.suffix();
2350 let changed_trailing_excerpt = suffix.is_empty();
2351 new_excerpts.append(suffix, &());
2352 drop(cursor);
2353 snapshot.excerpts = new_excerpts;
2354 for buffer_id in &removed_buffer_ids {
2355 self.diffs.remove(buffer_id);
2356 snapshot.diffs.remove(buffer_id);
2357 }
2358
2359 if changed_trailing_excerpt {
2360 snapshot.trailing_excerpt_update_count += 1;
2361 }
2362
2363 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2364 self.buffer_changed_since_sync.replace(true);
2365 cx.emit(Event::Edited {
2366 singleton_buffer_edited: false,
2367 edited_buffer: None,
2368 });
2369 cx.emit(Event::ExcerptsRemoved {
2370 ids,
2371 removed_buffer_ids,
2372 });
2373 cx.notify();
2374 }
2375
2376 pub fn wait_for_anchors<'a, Anchors: 'a + Iterator<Item = Anchor>>(
2377 &self,
2378 anchors: Anchors,
2379 cx: &mut Context<Self>,
2380 ) -> impl 'static + Future<Output = Result<()>> + use<Anchors> {
2381 let borrow = self.buffers.borrow();
2382 let mut error = None;
2383 let mut futures = Vec::new();
2384 for anchor in anchors {
2385 if let Some(buffer_id) = anchor.buffer_id {
2386 if let Some(buffer) = borrow.get(&buffer_id) {
2387 buffer.buffer.update(cx, |buffer, _| {
2388 futures.push(buffer.wait_for_anchors([anchor.text_anchor]))
2389 });
2390 } else {
2391 error = Some(anyhow!(
2392 "buffer {buffer_id} is not part of this multi-buffer"
2393 ));
2394 break;
2395 }
2396 }
2397 }
2398 async move {
2399 if let Some(error) = error {
2400 Err(error)?;
2401 }
2402 for future in futures {
2403 future.await?;
2404 }
2405 Ok(())
2406 }
2407 }
2408
2409 pub fn text_anchor_for_position<T: ToOffset>(
2410 &self,
2411 position: T,
2412 cx: &App,
2413 ) -> Option<(Entity<Buffer>, language::Anchor)> {
2414 let snapshot = self.read(cx);
2415 let anchor = snapshot.anchor_before(position);
2416 let buffer = self
2417 .buffers
2418 .borrow()
2419 .get(&anchor.buffer_id?)?
2420 .buffer
2421 .clone();
2422 Some((buffer, anchor.text_anchor))
2423 }
2424
2425 fn on_buffer_event(
2426 &mut self,
2427 buffer: Entity<Buffer>,
2428 event: &language::BufferEvent,
2429 cx: &mut Context<Self>,
2430 ) {
2431 use language::BufferEvent;
2432 cx.emit(match event {
2433 BufferEvent::Edited => Event::Edited {
2434 singleton_buffer_edited: true,
2435 edited_buffer: Some(buffer),
2436 },
2437 BufferEvent::DirtyChanged => Event::DirtyChanged,
2438 BufferEvent::Saved => Event::Saved,
2439 BufferEvent::FileHandleChanged => Event::FileHandleChanged,
2440 BufferEvent::Reloaded => Event::Reloaded,
2441 BufferEvent::LanguageChanged => Event::LanguageChanged(buffer.read(cx).remote_id()),
2442 BufferEvent::Reparsed => Event::Reparsed(buffer.read(cx).remote_id()),
2443 BufferEvent::DiagnosticsUpdated => Event::DiagnosticsUpdated,
2444 BufferEvent::CapabilityChanged => {
2445 self.capability = buffer.read(cx).capability();
2446 return;
2447 }
2448 BufferEvent::Operation { .. } | BufferEvent::ReloadNeeded => return,
2449 });
2450 }
2451
2452 fn buffer_diff_language_changed(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2453 self.sync(cx);
2454 let mut snapshot = self.snapshot.borrow_mut();
2455 let diff = diff.read(cx);
2456 let buffer_id = diff.buffer_id;
2457 let diff = diff.snapshot(cx);
2458 snapshot.diffs.insert(buffer_id, diff);
2459 }
2460
2461 fn buffer_diff_changed(
2462 &mut self,
2463 diff: Entity<BufferDiff>,
2464 range: Range<text::Anchor>,
2465 cx: &mut Context<Self>,
2466 ) {
2467 self.sync(cx);
2468 self.buffer_changed_since_sync.replace(true);
2469
2470 let diff = diff.read(cx);
2471 let buffer_id = diff.buffer_id;
2472 let buffers = self.buffers.borrow();
2473 let Some(buffer_state) = buffers.get(&buffer_id) else {
2474 return;
2475 };
2476
2477 let buffer = buffer_state.buffer.read(cx);
2478 let diff_change_range = range.to_offset(buffer);
2479
2480 let new_diff = diff.snapshot(cx);
2481 let mut snapshot = self.snapshot.borrow_mut();
2482 let base_text_changed = snapshot
2483 .diffs
2484 .get(&buffer_id)
2485 .is_none_or(|old_diff| !new_diff.base_texts_eq(old_diff));
2486
2487 snapshot.diffs.insert(buffer_id, new_diff);
2488
2489 let mut excerpt_edits = Vec::new();
2490 for locator in &buffer_state.excerpts {
2491 let mut cursor = snapshot
2492 .excerpts
2493 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(&());
2494 cursor.seek_forward(&Some(locator), Bias::Left);
2495 if let Some(excerpt) = cursor.item()
2496 && excerpt.locator == *locator
2497 {
2498 let excerpt_buffer_range = excerpt.range.context.to_offset(&excerpt.buffer);
2499 if diff_change_range.end < excerpt_buffer_range.start
2500 || diff_change_range.start > excerpt_buffer_range.end
2501 {
2502 continue;
2503 }
2504 let excerpt_start = cursor.start().1;
2505 let excerpt_len = ExcerptOffset::new(excerpt.text_summary.len);
2506 let diff_change_start_in_excerpt = ExcerptOffset::new(
2507 diff_change_range
2508 .start
2509 .saturating_sub(excerpt_buffer_range.start),
2510 );
2511 let diff_change_end_in_excerpt = ExcerptOffset::new(
2512 diff_change_range
2513 .end
2514 .saturating_sub(excerpt_buffer_range.start),
2515 );
2516 let edit_start = excerpt_start + diff_change_start_in_excerpt.min(excerpt_len);
2517 let edit_end = excerpt_start + diff_change_end_in_excerpt.min(excerpt_len);
2518 excerpt_edits.push(Edit {
2519 old: edit_start..edit_end,
2520 new: edit_start..edit_end,
2521 });
2522 }
2523 }
2524
2525 self.sync_diff_transforms(
2526 &mut snapshot,
2527 excerpt_edits,
2528 DiffChangeKind::DiffUpdated {
2529 base_changed: base_text_changed,
2530 },
2531 );
2532 cx.emit(Event::Edited {
2533 singleton_buffer_edited: false,
2534 edited_buffer: None,
2535 });
2536 }
2537
2538 pub fn all_buffers(&self) -> HashSet<Entity<Buffer>> {
2539 self.buffers
2540 .borrow()
2541 .values()
2542 .map(|state| state.buffer.clone())
2543 .collect()
2544 }
2545
2546 pub fn all_buffer_ids(&self) -> Vec<BufferId> {
2547 self.buffers.borrow().keys().copied().collect()
2548 }
2549
2550 pub fn buffer(&self, buffer_id: BufferId) -> Option<Entity<Buffer>> {
2551 self.buffers
2552 .borrow()
2553 .get(&buffer_id)
2554 .map(|state| state.buffer.clone())
2555 }
2556
2557 pub fn language_at<T: ToOffset>(&self, point: T, cx: &App) -> Option<Arc<Language>> {
2558 self.point_to_buffer_offset(point, cx)
2559 .and_then(|(buffer, offset)| buffer.read(cx).language_at(offset))
2560 }
2561
2562 pub fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
2563 let buffer_id = self
2564 .snapshot
2565 .borrow()
2566 .excerpts
2567 .first()
2568 .map(|excerpt| excerpt.buffer.remote_id());
2569 buffer_id
2570 .and_then(|buffer_id| self.buffer(buffer_id))
2571 .map(|buffer| {
2572 let buffer = buffer.read(cx);
2573 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx)
2574 })
2575 .unwrap_or_else(move || self.language_settings_at(0, cx))
2576 }
2577
2578 pub fn language_settings_at<'a, T: ToOffset>(
2579 &'a self,
2580 point: T,
2581 cx: &'a App,
2582 ) -> Cow<'a, LanguageSettings> {
2583 let mut language = None;
2584 let mut file = None;
2585 if let Some((buffer, offset)) = self.point_to_buffer_offset(point, cx) {
2586 let buffer = buffer.read(cx);
2587 language = buffer.language_at(offset);
2588 file = buffer.file();
2589 }
2590 language_settings(language.map(|l| l.name()), file, cx)
2591 }
2592
2593 pub fn for_each_buffer(&self, mut f: impl FnMut(&Entity<Buffer>)) {
2594 self.buffers
2595 .borrow()
2596 .values()
2597 .for_each(|state| f(&state.buffer))
2598 }
2599
2600 pub fn title<'a>(&'a self, cx: &'a App) -> Cow<'a, str> {
2601 if let Some(title) = self.title.as_ref() {
2602 return title.into();
2603 }
2604
2605 if let Some(buffer) = self.as_singleton() {
2606 let buffer = buffer.read(cx);
2607
2608 if let Some(file) = buffer.file() {
2609 return file.file_name(cx).to_string_lossy();
2610 }
2611
2612 if let Some(title) = self.buffer_content_title(buffer) {
2613 return title;
2614 }
2615 };
2616
2617 "untitled".into()
2618 }
2619
2620 fn buffer_content_title(&self, buffer: &Buffer) -> Option<Cow<'_, str>> {
2621 let mut is_leading_whitespace = true;
2622 let mut count = 0;
2623 let mut prev_was_space = false;
2624 let mut title = String::new();
2625
2626 for ch in buffer.snapshot().chars() {
2627 if is_leading_whitespace && ch.is_whitespace() {
2628 continue;
2629 }
2630
2631 is_leading_whitespace = false;
2632
2633 if ch == '\n' || count >= 40 {
2634 break;
2635 }
2636
2637 if ch.is_whitespace() {
2638 if !prev_was_space {
2639 title.push(' ');
2640 count += 1;
2641 prev_was_space = true;
2642 }
2643 } else {
2644 title.push(ch);
2645 count += 1;
2646 prev_was_space = false;
2647 }
2648 }
2649
2650 let title = title.trim_end().to_string();
2651
2652 if title.is_empty() {
2653 return None;
2654 }
2655
2656 Some(title.into())
2657 }
2658
2659 pub fn set_title(&mut self, title: String, cx: &mut Context<Self>) {
2660 self.title = Some(title);
2661 cx.notify();
2662 }
2663
2664 /// Preserve preview tabs containing this multibuffer until additional edits occur.
2665 pub fn refresh_preview(&self, cx: &mut Context<Self>) {
2666 for buffer_state in self.buffers.borrow().values() {
2667 buffer_state
2668 .buffer
2669 .update(cx, |buffer, _cx| buffer.refresh_preview());
2670 }
2671 }
2672
2673 /// Whether we should preserve the preview status of a tab containing this multi-buffer.
2674 pub fn preserve_preview(&self, cx: &App) -> bool {
2675 self.buffers
2676 .borrow()
2677 .values()
2678 .all(|state| state.buffer.read(cx).preserve_preview())
2679 }
2680
2681 #[cfg(any(test, feature = "test-support"))]
2682 pub fn is_parsing(&self, cx: &App) -> bool {
2683 self.as_singleton().unwrap().read(cx).is_parsing()
2684 }
2685
2686 pub fn add_diff(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2687 let buffer_id = diff.read(cx).buffer_id;
2688 self.buffer_diff_changed(diff.clone(), text::Anchor::MIN..text::Anchor::MAX, cx);
2689 self.diffs.insert(buffer_id, DiffState::new(diff, cx));
2690 }
2691
2692 pub fn diff_for(&self, buffer_id: BufferId) -> Option<Entity<BufferDiff>> {
2693 self.diffs.get(&buffer_id).map(|state| state.diff.clone())
2694 }
2695
2696 pub fn expand_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2697 self.expand_or_collapse_diff_hunks(ranges, true, cx);
2698 }
2699
2700 pub fn collapse_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2701 self.expand_or_collapse_diff_hunks(ranges, false, cx);
2702 }
2703
2704 pub fn set_all_diff_hunks_expanded(&mut self, cx: &mut Context<Self>) {
2705 self.snapshot.borrow_mut().all_diff_hunks_expanded = true;
2706 self.expand_or_collapse_diff_hunks(vec![Anchor::min()..Anchor::max()], true, cx);
2707 }
2708
2709 pub fn all_diff_hunks_expanded(&self) -> bool {
2710 self.snapshot.borrow().all_diff_hunks_expanded
2711 }
2712
2713 pub fn set_all_diff_hunks_collapsed(&mut self, cx: &mut Context<Self>) {
2714 self.snapshot.borrow_mut().all_diff_hunks_expanded = false;
2715 self.expand_or_collapse_diff_hunks(vec![Anchor::min()..Anchor::max()], false, cx);
2716 }
2717
2718 pub fn has_multiple_hunks(&self, cx: &App) -> bool {
2719 self.read(cx)
2720 .diff_hunks_in_range(Anchor::min()..Anchor::max())
2721 .nth(1)
2722 .is_some()
2723 }
2724
2725 pub fn single_hunk_is_expanded(&self, range: Range<Anchor>, cx: &App) -> bool {
2726 let snapshot = self.read(cx);
2727 let mut cursor = snapshot.diff_transforms.cursor::<usize>(&());
2728 let offset_range = range.to_offset(&snapshot);
2729 cursor.seek(&offset_range.start, Bias::Left);
2730 while let Some(item) = cursor.item() {
2731 if *cursor.start() >= offset_range.end && *cursor.start() > offset_range.start {
2732 break;
2733 }
2734 if item.hunk_info().is_some() {
2735 return true;
2736 }
2737 cursor.next();
2738 }
2739 false
2740 }
2741
2742 pub fn has_expanded_diff_hunks_in_ranges(&self, ranges: &[Range<Anchor>], cx: &App) -> bool {
2743 let snapshot = self.read(cx);
2744 let mut cursor = snapshot.diff_transforms.cursor::<usize>(&());
2745 for range in ranges {
2746 let range = range.to_point(&snapshot);
2747 let start = snapshot.point_to_offset(Point::new(range.start.row, 0));
2748 let end = snapshot.point_to_offset(Point::new(range.end.row + 1, 0));
2749 let start = start.saturating_sub(1);
2750 let end = snapshot.len().min(end + 1);
2751 cursor.seek(&start, Bias::Right);
2752 while let Some(item) = cursor.item() {
2753 if *cursor.start() >= end {
2754 break;
2755 }
2756 if item.hunk_info().is_some() {
2757 return true;
2758 }
2759 cursor.next();
2760 }
2761 }
2762 false
2763 }
2764
2765 pub fn expand_or_collapse_diff_hunks_inner(
2766 &mut self,
2767 ranges: impl IntoIterator<Item = (Range<Point>, ExcerptId)>,
2768 expand: bool,
2769 cx: &mut Context<Self>,
2770 ) {
2771 if self.snapshot.borrow().all_diff_hunks_expanded && !expand {
2772 return;
2773 }
2774 self.sync(cx);
2775 let mut snapshot = self.snapshot.borrow_mut();
2776 let mut excerpt_edits = Vec::new();
2777 let mut last_hunk_row = None;
2778 for (range, end_excerpt_id) in ranges {
2779 for diff_hunk in snapshot.diff_hunks_in_range(range) {
2780 if diff_hunk.excerpt_id.cmp(&end_excerpt_id, &snapshot).is_gt() {
2781 continue;
2782 }
2783 if last_hunk_row.is_some_and(|row| row >= diff_hunk.row_range.start) {
2784 continue;
2785 }
2786 let start = Anchor::in_buffer(
2787 diff_hunk.excerpt_id,
2788 diff_hunk.buffer_id,
2789 diff_hunk.buffer_range.start,
2790 );
2791 let end = Anchor::in_buffer(
2792 diff_hunk.excerpt_id,
2793 diff_hunk.buffer_id,
2794 diff_hunk.buffer_range.end,
2795 );
2796 let start = snapshot.excerpt_offset_for_anchor(&start);
2797 let end = snapshot.excerpt_offset_for_anchor(&end);
2798 last_hunk_row = Some(diff_hunk.row_range.start);
2799 excerpt_edits.push(text::Edit {
2800 old: start..end,
2801 new: start..end,
2802 });
2803 }
2804 }
2805
2806 self.sync_diff_transforms(
2807 &mut snapshot,
2808 excerpt_edits,
2809 DiffChangeKind::ExpandOrCollapseHunks { expand },
2810 );
2811 cx.emit(Event::DiffHunksToggled);
2812 cx.emit(Event::Edited {
2813 singleton_buffer_edited: false,
2814 edited_buffer: None,
2815 });
2816 }
2817
2818 pub fn expand_or_collapse_diff_hunks(
2819 &mut self,
2820 ranges: Vec<Range<Anchor>>,
2821 expand: bool,
2822 cx: &mut Context<Self>,
2823 ) {
2824 let snapshot = self.snapshot.borrow().clone();
2825 let ranges = ranges.iter().map(move |range| {
2826 let end_excerpt_id = range.end.excerpt_id;
2827 let range = range.to_point(&snapshot);
2828 let mut peek_end = range.end;
2829 if range.end.row < snapshot.max_row().0 {
2830 peek_end = Point::new(range.end.row + 1, 0);
2831 };
2832 (range.start..peek_end, end_excerpt_id)
2833 });
2834 self.expand_or_collapse_diff_hunks_inner(ranges, expand, cx);
2835 }
2836
2837 pub fn resize_excerpt(
2838 &mut self,
2839 id: ExcerptId,
2840 range: Range<text::Anchor>,
2841 cx: &mut Context<Self>,
2842 ) {
2843 self.sync(cx);
2844
2845 let mut snapshot = self.snapshot.borrow_mut();
2846 let locator = snapshot.excerpt_locator_for_id(id);
2847 let mut new_excerpts = SumTree::default();
2848 let mut cursor = snapshot
2849 .excerpts
2850 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(&());
2851 let mut edits = Vec::<Edit<ExcerptOffset>>::new();
2852
2853 let prefix = cursor.slice(&Some(locator), Bias::Left);
2854 new_excerpts.append(prefix, &());
2855
2856 let mut excerpt = cursor.item().unwrap().clone();
2857 let old_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2858
2859 excerpt.range.context.start = range.start;
2860 excerpt.range.context.end = range.end;
2861 excerpt.max_buffer_row = range.end.to_point(&excerpt.buffer).row;
2862
2863 excerpt.text_summary = excerpt
2864 .buffer
2865 .text_summary_for_range(excerpt.range.context.clone());
2866
2867 let new_start_offset = ExcerptOffset::new(new_excerpts.summary().text.len);
2868 let old_start_offset = cursor.start().1;
2869 let new_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2870 let edit = Edit {
2871 old: old_start_offset..old_start_offset + old_text_len,
2872 new: new_start_offset..new_start_offset + new_text_len,
2873 };
2874
2875 if let Some(last_edit) = edits.last_mut() {
2876 if last_edit.old.end == edit.old.start {
2877 last_edit.old.end = edit.old.end;
2878 last_edit.new.end = edit.new.end;
2879 } else {
2880 edits.push(edit);
2881 }
2882 } else {
2883 edits.push(edit);
2884 }
2885
2886 new_excerpts.push(excerpt, &());
2887
2888 cursor.next();
2889
2890 new_excerpts.append(cursor.suffix(), &());
2891
2892 drop(cursor);
2893 snapshot.excerpts = new_excerpts;
2894
2895 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2896 cx.emit(Event::Edited {
2897 singleton_buffer_edited: false,
2898 edited_buffer: None,
2899 });
2900 cx.emit(Event::ExcerptsExpanded { ids: vec![id] });
2901 cx.notify();
2902 }
2903
2904 pub fn expand_excerpts(
2905 &mut self,
2906 ids: impl IntoIterator<Item = ExcerptId>,
2907 line_count: u32,
2908 direction: ExpandExcerptDirection,
2909 cx: &mut Context<Self>,
2910 ) {
2911 if line_count == 0 {
2912 return;
2913 }
2914 self.sync(cx);
2915 if !self.excerpts_by_path.is_empty() {
2916 self.expand_excerpts_with_paths(ids, line_count, direction, cx);
2917 return;
2918 }
2919 let mut snapshot = self.snapshot.borrow_mut();
2920
2921 let ids = ids.into_iter().collect::<Vec<_>>();
2922 let locators = snapshot.excerpt_locators_for_ids(ids.iter().copied());
2923 let mut new_excerpts = SumTree::default();
2924 let mut cursor = snapshot
2925 .excerpts
2926 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(&());
2927 let mut edits = Vec::<Edit<ExcerptOffset>>::new();
2928
2929 for locator in &locators {
2930 let prefix = cursor.slice(&Some(locator), Bias::Left);
2931 new_excerpts.append(prefix, &());
2932
2933 let mut excerpt = cursor.item().unwrap().clone();
2934 let old_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2935
2936 let up_line_count = if direction.should_expand_up() {
2937 line_count
2938 } else {
2939 0
2940 };
2941
2942 let start_row = excerpt
2943 .range
2944 .context
2945 .start
2946 .to_point(&excerpt.buffer)
2947 .row
2948 .saturating_sub(up_line_count);
2949 let start_point = Point::new(start_row, 0);
2950 excerpt.range.context.start = excerpt.buffer.anchor_before(start_point);
2951
2952 let down_line_count = if direction.should_expand_down() {
2953 line_count
2954 } else {
2955 0
2956 };
2957
2958 let mut end_point = excerpt.buffer.clip_point(
2959 excerpt.range.context.end.to_point(&excerpt.buffer)
2960 + Point::new(down_line_count, 0),
2961 Bias::Left,
2962 );
2963 end_point.column = excerpt.buffer.line_len(end_point.row);
2964 excerpt.range.context.end = excerpt.buffer.anchor_after(end_point);
2965 excerpt.max_buffer_row = end_point.row;
2966
2967 excerpt.text_summary = excerpt
2968 .buffer
2969 .text_summary_for_range(excerpt.range.context.clone());
2970
2971 let new_start_offset = ExcerptOffset::new(new_excerpts.summary().text.len);
2972 let old_start_offset = cursor.start().1;
2973 let new_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2974 let edit = Edit {
2975 old: old_start_offset..old_start_offset + old_text_len,
2976 new: new_start_offset..new_start_offset + new_text_len,
2977 };
2978
2979 if let Some(last_edit) = edits.last_mut() {
2980 if last_edit.old.end == edit.old.start {
2981 last_edit.old.end = edit.old.end;
2982 last_edit.new.end = edit.new.end;
2983 } else {
2984 edits.push(edit);
2985 }
2986 } else {
2987 edits.push(edit);
2988 }
2989
2990 new_excerpts.push(excerpt, &());
2991
2992 cursor.next();
2993 }
2994
2995 new_excerpts.append(cursor.suffix(), &());
2996
2997 drop(cursor);
2998 snapshot.excerpts = new_excerpts;
2999
3000 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
3001 cx.emit(Event::Edited {
3002 singleton_buffer_edited: false,
3003 edited_buffer: None,
3004 });
3005 cx.emit(Event::ExcerptsExpanded { ids });
3006 cx.notify();
3007 }
3008
3009 fn sync(&self, cx: &App) {
3010 let changed = self.buffer_changed_since_sync.replace(false);
3011 if !changed {
3012 return;
3013 }
3014
3015 let mut snapshot = self.snapshot.borrow_mut();
3016 let mut excerpts_to_edit = Vec::new();
3017 let mut non_text_state_updated = false;
3018 let mut is_dirty = false;
3019 let mut has_deleted_file = false;
3020 let mut has_conflict = false;
3021 let mut edited = false;
3022 let mut buffers = self.buffers.borrow_mut();
3023 for buffer_state in buffers.values_mut() {
3024 let buffer = buffer_state.buffer.read(cx);
3025 let version = buffer.version();
3026 let non_text_state_update_count = buffer.non_text_state_update_count();
3027
3028 let buffer_edited = version.changed_since(&buffer_state.last_version);
3029 let buffer_non_text_state_updated =
3030 non_text_state_update_count > buffer_state.last_non_text_state_update_count;
3031 if buffer_edited || buffer_non_text_state_updated {
3032 buffer_state.last_version = version;
3033 buffer_state.last_non_text_state_update_count = non_text_state_update_count;
3034 excerpts_to_edit.extend(
3035 buffer_state
3036 .excerpts
3037 .iter()
3038 .map(|locator| (locator, buffer_state.buffer.clone(), buffer_edited)),
3039 );
3040 }
3041
3042 edited |= buffer_edited;
3043 non_text_state_updated |= buffer_non_text_state_updated;
3044 is_dirty |= buffer.is_dirty();
3045 has_deleted_file |= buffer
3046 .file()
3047 .is_some_and(|file| file.disk_state() == DiskState::Deleted);
3048 has_conflict |= buffer.has_conflict();
3049 }
3050 if edited {
3051 snapshot.edit_count += 1;
3052 }
3053 if non_text_state_updated {
3054 snapshot.non_text_state_update_count += 1;
3055 }
3056 snapshot.is_dirty = is_dirty;
3057 snapshot.has_deleted_file = has_deleted_file;
3058 snapshot.has_conflict = has_conflict;
3059
3060 for (id, diff) in self.diffs.iter() {
3061 if snapshot.diffs.get(id).is_none() {
3062 snapshot.diffs.insert(*id, diff.diff.read(cx).snapshot(cx));
3063 }
3064 }
3065
3066 excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);
3067
3068 let mut edits = Vec::new();
3069 let mut new_excerpts = SumTree::default();
3070 let mut cursor = snapshot
3071 .excerpts
3072 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(&());
3073
3074 for (locator, buffer, buffer_edited) in excerpts_to_edit {
3075 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left), &());
3076 let old_excerpt = cursor.item().unwrap();
3077 let buffer = buffer.read(cx);
3078 let buffer_id = buffer.remote_id();
3079
3080 let mut new_excerpt;
3081 if buffer_edited {
3082 edits.extend(
3083 buffer
3084 .edits_since_in_range::<usize>(
3085 old_excerpt.buffer.version(),
3086 old_excerpt.range.context.clone(),
3087 )
3088 .map(|edit| {
3089 let excerpt_old_start = cursor.start().1;
3090 let excerpt_new_start =
3091 ExcerptOffset::new(new_excerpts.summary().text.len);
3092 let old_start = excerpt_old_start + ExcerptOffset::new(edit.old.start);
3093 let old_end = excerpt_old_start + ExcerptOffset::new(edit.old.end);
3094 let new_start = excerpt_new_start + ExcerptOffset::new(edit.new.start);
3095 let new_end = excerpt_new_start + ExcerptOffset::new(edit.new.end);
3096 Edit {
3097 old: old_start..old_end,
3098 new: new_start..new_end,
3099 }
3100 }),
3101 );
3102
3103 new_excerpt = Excerpt::new(
3104 old_excerpt.id,
3105 locator.clone(),
3106 buffer_id,
3107 buffer.snapshot(),
3108 old_excerpt.range.clone(),
3109 old_excerpt.has_trailing_newline,
3110 );
3111 } else {
3112 new_excerpt = old_excerpt.clone();
3113 new_excerpt.buffer = buffer.snapshot();
3114 }
3115
3116 new_excerpts.push(new_excerpt, &());
3117 cursor.next();
3118 }
3119 new_excerpts.append(cursor.suffix(), &());
3120
3121 drop(cursor);
3122 snapshot.excerpts = new_excerpts;
3123
3124 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
3125 }
3126
3127 fn sync_diff_transforms(
3128 &self,
3129 snapshot: &mut MultiBufferSnapshot,
3130 excerpt_edits: Vec<text::Edit<ExcerptOffset>>,
3131 change_kind: DiffChangeKind,
3132 ) {
3133 if excerpt_edits.is_empty() {
3134 return;
3135 }
3136
3137 let mut excerpts = snapshot.excerpts.cursor::<ExcerptOffset>(&());
3138 let mut old_diff_transforms = snapshot
3139 .diff_transforms
3140 .cursor::<Dimensions<ExcerptOffset, usize>>(&());
3141 let mut new_diff_transforms = SumTree::default();
3142 let mut old_expanded_hunks = HashSet::default();
3143 let mut output_edits = Vec::new();
3144 let mut output_delta = 0_isize;
3145 let mut at_transform_boundary = true;
3146 let mut end_of_current_insert = None;
3147
3148 let mut excerpt_edits = excerpt_edits.into_iter().peekable();
3149 while let Some(edit) = excerpt_edits.next() {
3150 excerpts.seek_forward(&edit.new.start, Bias::Right);
3151 if excerpts.item().is_none() && *excerpts.start() == edit.new.start {
3152 excerpts.prev();
3153 }
3154
3155 // Keep any transforms that are before the edit.
3156 if at_transform_boundary {
3157 at_transform_boundary = false;
3158 let transforms_before_edit = old_diff_transforms.slice(&edit.old.start, Bias::Left);
3159 self.append_diff_transforms(&mut new_diff_transforms, transforms_before_edit);
3160 if let Some(transform) = old_diff_transforms.item()
3161 && old_diff_transforms.end().0 == edit.old.start
3162 && old_diff_transforms.start().0 < edit.old.start
3163 {
3164 self.push_diff_transform(&mut new_diff_transforms, transform.clone());
3165 old_diff_transforms.next();
3166 }
3167 }
3168
3169 // Compute the start of the edit in output coordinates.
3170 let edit_start_overshoot = (edit.old.start - old_diff_transforms.start().0).value;
3171 let edit_old_start = old_diff_transforms.start().1 + edit_start_overshoot;
3172 let edit_new_start = (edit_old_start as isize + output_delta) as usize;
3173
3174 let changed_diff_hunks = self.recompute_diff_transforms_for_edit(
3175 &edit,
3176 &mut excerpts,
3177 &mut old_diff_transforms,
3178 &mut new_diff_transforms,
3179 &mut end_of_current_insert,
3180 &mut old_expanded_hunks,
3181 snapshot,
3182 change_kind,
3183 );
3184
3185 // Compute the end of the edit in output coordinates.
3186 let edit_old_end_overshoot = edit.old.end - old_diff_transforms.start().0;
3187 let edit_new_end_overshoot = edit.new.end - new_diff_transforms.summary().excerpt_len();
3188 let edit_old_end = old_diff_transforms.start().1 + edit_old_end_overshoot.value;
3189 let edit_new_end =
3190 new_diff_transforms.summary().output.len + edit_new_end_overshoot.value;
3191 let output_edit = Edit {
3192 old: edit_old_start..edit_old_end,
3193 new: edit_new_start..edit_new_end,
3194 };
3195
3196 output_delta += (output_edit.new.end - output_edit.new.start) as isize;
3197 output_delta -= (output_edit.old.end - output_edit.old.start) as isize;
3198 if changed_diff_hunks || matches!(change_kind, DiffChangeKind::BufferEdited) {
3199 output_edits.push(output_edit);
3200 }
3201
3202 // If this is the last edit that intersects the current diff transform,
3203 // then recreate the content up to the end of this transform, to prepare
3204 // for reusing additional slices of the old transforms.
3205 if excerpt_edits
3206 .peek()
3207 .is_none_or(|next_edit| next_edit.old.start >= old_diff_transforms.end().0)
3208 {
3209 let keep_next_old_transform = (old_diff_transforms.start().0 >= edit.old.end)
3210 && match old_diff_transforms.item() {
3211 Some(DiffTransform::BufferContent {
3212 inserted_hunk_info: Some(hunk),
3213 ..
3214 }) => excerpts.item().is_some_and(|excerpt| {
3215 hunk.hunk_start_anchor.is_valid(&excerpt.buffer)
3216 }),
3217 _ => true,
3218 };
3219
3220 let mut excerpt_offset = edit.new.end;
3221 if !keep_next_old_transform {
3222 excerpt_offset += old_diff_transforms.end().0 - edit.old.end;
3223 old_diff_transforms.next();
3224 }
3225
3226 old_expanded_hunks.clear();
3227 self.push_buffer_content_transform(
3228 snapshot,
3229 &mut new_diff_transforms,
3230 excerpt_offset,
3231 end_of_current_insert,
3232 );
3233 at_transform_boundary = true;
3234 }
3235 }
3236
3237 // Keep any transforms that are after the last edit.
3238 self.append_diff_transforms(&mut new_diff_transforms, old_diff_transforms.suffix());
3239
3240 // Ensure there's always at least one buffer content transform.
3241 if new_diff_transforms.is_empty() {
3242 new_diff_transforms.push(
3243 DiffTransform::BufferContent {
3244 summary: Default::default(),
3245 inserted_hunk_info: None,
3246 },
3247 &(),
3248 );
3249 }
3250
3251 self.subscriptions.publish(output_edits);
3252 drop(old_diff_transforms);
3253 drop(excerpts);
3254 snapshot.diff_transforms = new_diff_transforms;
3255 snapshot.edit_count += 1;
3256
3257 #[cfg(any(test, feature = "test-support"))]
3258 snapshot.check_invariants();
3259 }
3260
3261 fn recompute_diff_transforms_for_edit(
3262 &self,
3263 edit: &Edit<TypedOffset<Excerpt>>,
3264 excerpts: &mut Cursor<Excerpt, TypedOffset<Excerpt>>,
3265 old_diff_transforms: &mut Cursor<DiffTransform, Dimensions<TypedOffset<Excerpt>, usize>>,
3266 new_diff_transforms: &mut SumTree<DiffTransform>,
3267 end_of_current_insert: &mut Option<(TypedOffset<Excerpt>, DiffTransformHunkInfo)>,
3268 old_expanded_hunks: &mut HashSet<DiffTransformHunkInfo>,
3269 snapshot: &MultiBufferSnapshot,
3270 change_kind: DiffChangeKind,
3271 ) -> bool {
3272 log::trace!(
3273 "recomputing diff transform for edit {:?} => {:?}",
3274 edit.old.start.value..edit.old.end.value,
3275 edit.new.start.value..edit.new.end.value
3276 );
3277
3278 // Record which hunks were previously expanded.
3279 while let Some(item) = old_diff_transforms.item() {
3280 if let Some(hunk_info) = item.hunk_info() {
3281 log::trace!(
3282 "previously expanded hunk at {}",
3283 old_diff_transforms.start().0
3284 );
3285 old_expanded_hunks.insert(hunk_info);
3286 }
3287 if old_diff_transforms.end().0 > edit.old.end {
3288 break;
3289 }
3290 old_diff_transforms.next();
3291 }
3292
3293 // Avoid querying diff hunks if there's no possibility of hunks being expanded.
3294 let all_diff_hunks_expanded = snapshot.all_diff_hunks_expanded;
3295 if old_expanded_hunks.is_empty()
3296 && change_kind == DiffChangeKind::BufferEdited
3297 && !all_diff_hunks_expanded
3298 {
3299 return false;
3300 }
3301
3302 // Visit each excerpt that intersects the edit.
3303 let mut did_expand_hunks = false;
3304 while let Some(excerpt) = excerpts.item() {
3305 // Recompute the expanded hunks in the portion of the excerpt that
3306 // intersects the edit.
3307 if let Some(diff) = snapshot.diffs.get(&excerpt.buffer_id) {
3308 let buffer = &excerpt.buffer;
3309 let excerpt_start = *excerpts.start();
3310 let excerpt_end = excerpt_start + ExcerptOffset::new(excerpt.text_summary.len);
3311 let excerpt_buffer_start = excerpt.range.context.start.to_offset(buffer);
3312 let excerpt_buffer_end = excerpt_buffer_start + excerpt.text_summary.len;
3313 let edit_buffer_start =
3314 excerpt_buffer_start + edit.new.start.value.saturating_sub(excerpt_start.value);
3315 let edit_buffer_end =
3316 excerpt_buffer_start + edit.new.end.value.saturating_sub(excerpt_start.value);
3317 let edit_buffer_end = edit_buffer_end.min(excerpt_buffer_end);
3318 let edit_anchor_range =
3319 buffer.anchor_before(edit_buffer_start)..buffer.anchor_after(edit_buffer_end);
3320
3321 for hunk in diff.hunks_intersecting_range(edit_anchor_range, buffer) {
3322 if hunk.is_created_file() && !all_diff_hunks_expanded {
3323 continue;
3324 }
3325
3326 let hunk_buffer_range = hunk.buffer_range.to_offset(buffer);
3327 if hunk_buffer_range.start < excerpt_buffer_start {
3328 log::trace!("skipping hunk that starts before excerpt");
3329 continue;
3330 }
3331
3332 let hunk_info = DiffTransformHunkInfo {
3333 excerpt_id: excerpt.id,
3334 hunk_start_anchor: hunk.buffer_range.start,
3335 hunk_secondary_status: hunk.secondary_status,
3336 };
3337
3338 let hunk_excerpt_start = excerpt_start
3339 + ExcerptOffset::new(
3340 hunk_buffer_range.start.saturating_sub(excerpt_buffer_start),
3341 );
3342 let hunk_excerpt_end = excerpt_end.min(
3343 excerpt_start
3344 + ExcerptOffset::new(hunk_buffer_range.end - excerpt_buffer_start),
3345 );
3346
3347 self.push_buffer_content_transform(
3348 snapshot,
3349 new_diff_transforms,
3350 hunk_excerpt_start,
3351 *end_of_current_insert,
3352 );
3353
3354 // For every existing hunk, determine if it was previously expanded
3355 // and if it should currently be expanded.
3356 let was_previously_expanded = old_expanded_hunks.contains(&hunk_info);
3357 let should_expand_hunk = match &change_kind {
3358 DiffChangeKind::DiffUpdated { base_changed: true } => {
3359 was_previously_expanded || all_diff_hunks_expanded
3360 }
3361 DiffChangeKind::ExpandOrCollapseHunks { expand } => {
3362 let intersects = hunk_buffer_range.is_empty()
3363 || hunk_buffer_range.end > edit_buffer_start;
3364 if *expand {
3365 intersects || was_previously_expanded || all_diff_hunks_expanded
3366 } else {
3367 !intersects && (was_previously_expanded || all_diff_hunks_expanded)
3368 }
3369 }
3370 _ => was_previously_expanded || all_diff_hunks_expanded,
3371 };
3372
3373 if should_expand_hunk {
3374 did_expand_hunks = true;
3375 log::trace!(
3376 "expanding hunk {:?}, excerpt:{:?}",
3377 hunk_excerpt_start.value..hunk_excerpt_end.value,
3378 excerpt.id
3379 );
3380
3381 if !hunk.diff_base_byte_range.is_empty()
3382 && hunk_buffer_range.start >= edit_buffer_start
3383 && hunk_buffer_range.start <= excerpt_buffer_end
3384 {
3385 let base_text = diff.base_text();
3386 let mut text_cursor =
3387 base_text.as_rope().cursor(hunk.diff_base_byte_range.start);
3388 let mut base_text_summary =
3389 text_cursor.summary::<TextSummary>(hunk.diff_base_byte_range.end);
3390
3391 let mut has_trailing_newline = false;
3392 if base_text_summary.last_line_chars > 0 {
3393 base_text_summary += TextSummary::newline();
3394 has_trailing_newline = true;
3395 }
3396
3397 new_diff_transforms.push(
3398 DiffTransform::DeletedHunk {
3399 base_text_byte_range: hunk.diff_base_byte_range.clone(),
3400 summary: base_text_summary,
3401 buffer_id: excerpt.buffer_id,
3402 hunk_info,
3403 has_trailing_newline,
3404 },
3405 &(),
3406 );
3407 }
3408
3409 if !hunk_buffer_range.is_empty() {
3410 *end_of_current_insert =
3411 Some((hunk_excerpt_end.min(excerpt_end), hunk_info));
3412 }
3413 }
3414 }
3415 }
3416
3417 if excerpts.end() <= edit.new.end {
3418 excerpts.next();
3419 } else {
3420 break;
3421 }
3422 }
3423
3424 did_expand_hunks || !old_expanded_hunks.is_empty()
3425 }
3426
3427 fn append_diff_transforms(
3428 &self,
3429 new_transforms: &mut SumTree<DiffTransform>,
3430 subtree: SumTree<DiffTransform>,
3431 ) {
3432 if let Some(DiffTransform::BufferContent {
3433 inserted_hunk_info,
3434 summary,
3435 }) = subtree.first()
3436 && self.extend_last_buffer_content_transform(
3437 new_transforms,
3438 *inserted_hunk_info,
3439 *summary,
3440 )
3441 {
3442 let mut cursor = subtree.cursor::<()>(&());
3443 cursor.next();
3444 cursor.next();
3445 new_transforms.append(cursor.suffix(), &());
3446 return;
3447 }
3448 new_transforms.append(subtree, &());
3449 }
3450
3451 fn push_diff_transform(
3452 &self,
3453 new_transforms: &mut SumTree<DiffTransform>,
3454 transform: DiffTransform,
3455 ) {
3456 if let DiffTransform::BufferContent {
3457 inserted_hunk_info: inserted_hunk_anchor,
3458 summary,
3459 } = transform
3460 && self.extend_last_buffer_content_transform(
3461 new_transforms,
3462 inserted_hunk_anchor,
3463 summary,
3464 )
3465 {
3466 return;
3467 }
3468 new_transforms.push(transform, &());
3469 }
3470
3471 fn push_buffer_content_transform(
3472 &self,
3473 old_snapshot: &MultiBufferSnapshot,
3474 new_transforms: &mut SumTree<DiffTransform>,
3475 end_offset: ExcerptOffset,
3476 current_inserted_hunk: Option<(ExcerptOffset, DiffTransformHunkInfo)>,
3477 ) {
3478 let inserted_region = current_inserted_hunk.map(|(insertion_end_offset, hunk_info)| {
3479 (end_offset.min(insertion_end_offset), Some(hunk_info))
3480 });
3481 let unchanged_region = [(end_offset, None)];
3482
3483 for (end_offset, inserted_hunk_info) in inserted_region.into_iter().chain(unchanged_region)
3484 {
3485 let start_offset = new_transforms.summary().excerpt_len();
3486 if end_offset <= start_offset {
3487 continue;
3488 }
3489 let summary_to_add = old_snapshot
3490 .text_summary_for_excerpt_offset_range::<TextSummary>(start_offset..end_offset);
3491
3492 if !self.extend_last_buffer_content_transform(
3493 new_transforms,
3494 inserted_hunk_info,
3495 summary_to_add,
3496 ) {
3497 new_transforms.push(
3498 DiffTransform::BufferContent {
3499 summary: summary_to_add,
3500 inserted_hunk_info,
3501 },
3502 &(),
3503 )
3504 }
3505 }
3506 }
3507
3508 fn extend_last_buffer_content_transform(
3509 &self,
3510 new_transforms: &mut SumTree<DiffTransform>,
3511 new_inserted_hunk_info: Option<DiffTransformHunkInfo>,
3512 summary_to_add: TextSummary,
3513 ) -> bool {
3514 let mut did_extend = false;
3515 new_transforms.update_last(
3516 |last_transform| {
3517 if let DiffTransform::BufferContent {
3518 summary,
3519 inserted_hunk_info: inserted_hunk_anchor,
3520 } = last_transform
3521 && *inserted_hunk_anchor == new_inserted_hunk_info
3522 {
3523 *summary += summary_to_add;
3524 did_extend = true;
3525 }
3526 },
3527 &(),
3528 );
3529 did_extend
3530 }
3531}
3532
3533fn build_excerpt_ranges(
3534 ranges: impl IntoIterator<Item = Range<Point>>,
3535 context_line_count: u32,
3536 buffer_snapshot: &BufferSnapshot,
3537) -> Vec<ExcerptRange<Point>> {
3538 ranges
3539 .into_iter()
3540 .map(|range| {
3541 let start_row = range.start.row.saturating_sub(context_line_count);
3542 let start = Point::new(start_row, 0);
3543 let end_row = (range.end.row + context_line_count).min(buffer_snapshot.max_point().row);
3544 let end = Point::new(end_row, buffer_snapshot.line_len(end_row));
3545 ExcerptRange {
3546 context: start..end,
3547 primary: range,
3548 }
3549 })
3550 .collect()
3551}
3552
3553#[cfg(any(test, feature = "test-support"))]
3554impl MultiBuffer {
3555 pub fn build_simple(text: &str, cx: &mut gpui::App) -> Entity<Self> {
3556 let buffer = cx.new(|cx| Buffer::local(text, cx));
3557 cx.new(|cx| Self::singleton(buffer, cx))
3558 }
3559
3560 pub fn build_multi<const COUNT: usize>(
3561 excerpts: [(&str, Vec<Range<Point>>); COUNT],
3562 cx: &mut gpui::App,
3563 ) -> Entity<Self> {
3564 let multi = cx.new(|_| Self::new(Capability::ReadWrite));
3565 for (text, ranges) in excerpts {
3566 let buffer = cx.new(|cx| Buffer::local(text, cx));
3567 let excerpt_ranges = ranges.into_iter().map(ExcerptRange::new);
3568 multi.update(cx, |multi, cx| {
3569 multi.push_excerpts(buffer, excerpt_ranges, cx)
3570 });
3571 }
3572
3573 multi
3574 }
3575
3576 pub fn build_from_buffer(buffer: Entity<Buffer>, cx: &mut gpui::App) -> Entity<Self> {
3577 cx.new(|cx| Self::singleton(buffer, cx))
3578 }
3579
3580 pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::App) -> Entity<Self> {
3581 cx.new(|cx| {
3582 let mut multibuffer = MultiBuffer::new(Capability::ReadWrite);
3583 let mutation_count = rng.random_range(1..=5);
3584 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
3585 multibuffer
3586 })
3587 }
3588
3589 pub fn randomly_edit(
3590 &mut self,
3591 rng: &mut impl rand::Rng,
3592 edit_count: usize,
3593 cx: &mut Context<Self>,
3594 ) {
3595 use util::RandomCharIter;
3596
3597 let snapshot = self.read(cx);
3598 let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
3599 let mut last_end = None;
3600 for _ in 0..edit_count {
3601 if last_end.is_some_and(|last_end| last_end >= snapshot.len()) {
3602 break;
3603 }
3604
3605 let new_start = last_end.map_or(0, |last_end| last_end + 1);
3606 let end =
3607 snapshot.clip_offset(rng.random_range(new_start..=snapshot.len()), Bias::Right);
3608 let start = snapshot.clip_offset(rng.random_range(new_start..=end), Bias::Right);
3609 last_end = Some(end);
3610
3611 let mut range = start..end;
3612 if rng.random_bool(0.2) {
3613 mem::swap(&mut range.start, &mut range.end);
3614 }
3615
3616 let new_text_len = rng.random_range(0..10);
3617 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
3618
3619 edits.push((range, new_text.into()));
3620 }
3621 log::info!("mutating multi-buffer with {:?}", edits);
3622 drop(snapshot);
3623
3624 self.edit(edits, None, cx);
3625 }
3626
3627 pub fn randomly_edit_excerpts(
3628 &mut self,
3629 rng: &mut impl rand::Rng,
3630 mutation_count: usize,
3631 cx: &mut Context<Self>,
3632 ) {
3633 use rand::prelude::*;
3634 use std::env;
3635 use util::RandomCharIter;
3636
3637 let max_excerpts = env::var("MAX_EXCERPTS")
3638 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
3639 .unwrap_or(5);
3640
3641 let mut buffers = Vec::new();
3642 for _ in 0..mutation_count {
3643 if rng.random_bool(0.05) {
3644 log::info!("Clearing multi-buffer");
3645 self.clear(cx);
3646 continue;
3647 } else if rng.random_bool(0.1) && !self.excerpt_ids().is_empty() {
3648 let ids = self.excerpt_ids();
3649 let mut excerpts = HashSet::default();
3650 for _ in 0..rng.random_range(0..ids.len()) {
3651 excerpts.extend(ids.choose(rng).copied());
3652 }
3653
3654 let line_count = rng.random_range(0..5);
3655
3656 log::info!("Expanding excerpts {excerpts:?} by {line_count} lines");
3657
3658 self.expand_excerpts(
3659 excerpts.iter().cloned(),
3660 line_count,
3661 ExpandExcerptDirection::UpAndDown,
3662 cx,
3663 );
3664 continue;
3665 }
3666
3667 let excerpt_ids = self.excerpt_ids();
3668 if excerpt_ids.is_empty() || (rng.random() && excerpt_ids.len() < max_excerpts) {
3669 let buffer_handle = if rng.random() || self.buffers.borrow().is_empty() {
3670 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
3671 buffers.push(cx.new(|cx| Buffer::local(text, cx)));
3672 let buffer = buffers.last().unwrap().read(cx);
3673 log::info!(
3674 "Creating new buffer {} with text: {:?}",
3675 buffer.remote_id(),
3676 buffer.text()
3677 );
3678 buffers.last().unwrap().clone()
3679 } else {
3680 self.buffers
3681 .borrow()
3682 .values()
3683 .choose(rng)
3684 .unwrap()
3685 .buffer
3686 .clone()
3687 };
3688
3689 let buffer = buffer_handle.read(cx);
3690 let buffer_text = buffer.text();
3691 let ranges = (0..rng.random_range(0..5))
3692 .map(|_| {
3693 let end_ix =
3694 buffer.clip_offset(rng.random_range(0..=buffer.len()), Bias::Right);
3695 let start_ix = buffer.clip_offset(rng.random_range(0..=end_ix), Bias::Left);
3696 ExcerptRange::new(start_ix..end_ix)
3697 })
3698 .collect::<Vec<_>>();
3699 log::info!(
3700 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
3701 buffer_handle.read(cx).remote_id(),
3702 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
3703 ranges
3704 .iter()
3705 .map(|r| &buffer_text[r.context.clone()])
3706 .collect::<Vec<_>>()
3707 );
3708
3709 let excerpt_id = self.push_excerpts(buffer_handle.clone(), ranges, cx);
3710 log::info!("Inserted with ids: {:?}", excerpt_id);
3711 } else {
3712 let remove_count = rng.random_range(1..=excerpt_ids.len());
3713 let mut excerpts_to_remove = excerpt_ids
3714 .choose_multiple(rng, remove_count)
3715 .cloned()
3716 .collect::<Vec<_>>();
3717 let snapshot = self.snapshot.borrow();
3718 excerpts_to_remove.sort_unstable_by(|a, b| a.cmp(b, &snapshot));
3719 drop(snapshot);
3720 log::info!("Removing excerpts {:?}", excerpts_to_remove);
3721 self.remove_excerpts(excerpts_to_remove, cx);
3722 }
3723 }
3724 }
3725
3726 pub fn randomly_mutate(
3727 &mut self,
3728 rng: &mut impl rand::Rng,
3729 mutation_count: usize,
3730 cx: &mut Context<Self>,
3731 ) {
3732 use rand::prelude::*;
3733
3734 if rng.random_bool(0.7) || self.singleton {
3735 let buffer = self
3736 .buffers
3737 .borrow()
3738 .values()
3739 .choose(rng)
3740 .map(|state| state.buffer.clone());
3741
3742 if let Some(buffer) = buffer {
3743 buffer.update(cx, |buffer, cx| {
3744 if rng.random() {
3745 buffer.randomly_edit(rng, mutation_count, cx);
3746 } else {
3747 buffer.randomly_undo_redo(rng, cx);
3748 }
3749 });
3750 } else {
3751 self.randomly_edit(rng, mutation_count, cx);
3752 }
3753 } else {
3754 self.randomly_edit_excerpts(rng, mutation_count, cx);
3755 }
3756
3757 self.check_invariants(cx);
3758 }
3759
3760 fn check_invariants(&self, cx: &App) {
3761 self.read(cx).check_invariants();
3762 }
3763}
3764
3765impl EventEmitter<Event> for MultiBuffer {}
3766
3767impl MultiBufferSnapshot {
3768 pub fn text(&self) -> String {
3769 self.chunks(0..self.len(), false)
3770 .map(|chunk| chunk.text)
3771 .collect()
3772 }
3773
3774 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3775 self.reversed_chunks_in_range(0..position.to_offset(self))
3776 .flat_map(|c| c.chars().rev())
3777 }
3778
3779 fn reversed_chunks_in_range(&self, range: Range<usize>) -> ReversedMultiBufferChunks<'_> {
3780 let mut cursor = self.cursor::<usize>();
3781 cursor.seek(&range.end);
3782 let current_chunks = cursor.region().as_ref().map(|region| {
3783 let start_overshoot = range.start.saturating_sub(region.range.start);
3784 let end_overshoot = range.end - region.range.start;
3785 let end = (region.buffer_range.start + end_overshoot).min(region.buffer_range.end);
3786 let start = region.buffer_range.start + start_overshoot;
3787 region.buffer.reversed_chunks_in_range(start..end)
3788 });
3789 ReversedMultiBufferChunks {
3790 cursor,
3791 current_chunks,
3792 start: range.start,
3793 offset: range.end,
3794 }
3795 }
3796
3797 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3798 let offset = position.to_offset(self);
3799 self.text_for_range(offset..self.len())
3800 .flat_map(|chunk| chunk.chars())
3801 }
3802
3803 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
3804 self.chunks(range, false).map(|chunk| chunk.text)
3805 }
3806
3807 pub fn is_line_blank(&self, row: MultiBufferRow) -> bool {
3808 self.text_for_range(Point::new(row.0, 0)..Point::new(row.0, self.line_len(row)))
3809 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
3810 }
3811
3812 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
3813 where
3814 T: ToOffset,
3815 {
3816 let position = position.to_offset(self);
3817 position == self.clip_offset(position, Bias::Left)
3818 && self
3819 .bytes_in_range(position..self.len())
3820 .flatten()
3821 .copied()
3822 .take(needle.len())
3823 .eq(needle.bytes())
3824 }
3825
3826 pub fn diff_hunks(&self) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3827 self.diff_hunks_in_range(Anchor::min()..Anchor::max())
3828 }
3829
3830 pub fn diff_hunks_in_range<T: ToPoint>(
3831 &self,
3832 range: Range<T>,
3833 ) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3834 let query_range = range.start.to_point(self)..range.end.to_point(self);
3835 self.lift_buffer_metadata(query_range.clone(), move |buffer, buffer_range| {
3836 let diff = self.diffs.get(&buffer.remote_id())?;
3837 let buffer_start = buffer.anchor_before(buffer_range.start);
3838 let buffer_end = buffer.anchor_after(buffer_range.end);
3839 Some(
3840 diff.hunks_intersecting_range(buffer_start..buffer_end, buffer)
3841 .filter_map(|hunk| {
3842 if hunk.is_created_file() && !self.all_diff_hunks_expanded {
3843 return None;
3844 }
3845 Some((hunk.range.clone(), hunk))
3846 }),
3847 )
3848 })
3849 .filter_map(move |(range, hunk, excerpt)| {
3850 if range.start != range.end && range.end == query_range.start && !hunk.range.is_empty()
3851 {
3852 return None;
3853 }
3854 let end_row = if range.end.column == 0 {
3855 range.end.row
3856 } else {
3857 range.end.row + 1
3858 };
3859 Some(MultiBufferDiffHunk {
3860 row_range: MultiBufferRow(range.start.row)..MultiBufferRow(end_row),
3861 buffer_id: excerpt.buffer_id,
3862 excerpt_id: excerpt.id,
3863 buffer_range: hunk.buffer_range.clone(),
3864 diff_base_byte_range: hunk.diff_base_byte_range.clone(),
3865 secondary_status: hunk.secondary_status,
3866 })
3867 })
3868 }
3869
3870 pub fn excerpt_ids_for_range<T: ToOffset>(
3871 &self,
3872 range: Range<T>,
3873 ) -> impl Iterator<Item = ExcerptId> + '_ {
3874 let range = range.start.to_offset(self)..range.end.to_offset(self);
3875 let mut cursor = self.cursor::<usize>();
3876 cursor.seek(&range.start);
3877 std::iter::from_fn(move || {
3878 let region = cursor.region()?;
3879 if region.range.start >= range.end {
3880 return None;
3881 }
3882 cursor.next_excerpt();
3883 Some(region.excerpt.id)
3884 })
3885 }
3886
3887 pub fn buffer_ids_for_range<T: ToOffset>(
3888 &self,
3889 range: Range<T>,
3890 ) -> impl Iterator<Item = BufferId> + '_ {
3891 let range = range.start.to_offset(self)..range.end.to_offset(self);
3892 let mut cursor = self.cursor::<usize>();
3893 cursor.seek(&range.start);
3894 std::iter::from_fn(move || {
3895 let region = cursor.region()?;
3896 if region.range.start > range.end
3897 || region.range.start == range.end && region.range.start > range.start
3898 {
3899 return None;
3900 }
3901 cursor.next_excerpt();
3902 Some(region.excerpt.buffer_id)
3903 })
3904 }
3905
3906 pub fn ranges_to_buffer_ranges<T: ToOffset>(
3907 &self,
3908 ranges: impl Iterator<Item = Range<T>>,
3909 ) -> impl Iterator<Item = (&BufferSnapshot, Range<usize>, ExcerptId)> {
3910 ranges.flat_map(|range| self.range_to_buffer_ranges(range).into_iter())
3911 }
3912
3913 pub fn range_to_buffer_ranges<T: ToOffset>(
3914 &self,
3915 range: Range<T>,
3916 ) -> Vec<(&BufferSnapshot, Range<usize>, ExcerptId)> {
3917 let start = range.start.to_offset(self);
3918 let end = range.end.to_offset(self);
3919
3920 let mut cursor = self.cursor::<usize>();
3921 cursor.seek(&start);
3922
3923 let mut result: Vec<(&BufferSnapshot, Range<usize>, ExcerptId)> = Vec::new();
3924 while let Some(region) = cursor.region() {
3925 if region.range.start > end {
3926 break;
3927 }
3928 if region.is_main_buffer {
3929 let start_overshoot = start.saturating_sub(region.range.start);
3930 let end_overshoot = end.saturating_sub(region.range.start);
3931 let start = region
3932 .buffer_range
3933 .end
3934 .min(region.buffer_range.start + start_overshoot);
3935 let end = region
3936 .buffer_range
3937 .end
3938 .min(region.buffer_range.start + end_overshoot);
3939 if let Some(prev) = result.last_mut().filter(|(_, prev_range, excerpt_id)| {
3940 *excerpt_id == region.excerpt.id && prev_range.end == start
3941 }) {
3942 prev.1.end = end;
3943 } else {
3944 result.push((region.buffer, start..end, region.excerpt.id));
3945 }
3946 }
3947 cursor.next();
3948 }
3949 result
3950 }
3951
3952 pub fn range_to_buffer_ranges_with_deleted_hunks<T: ToOffset>(
3953 &self,
3954 range: Range<T>,
3955 ) -> impl Iterator<Item = (&BufferSnapshot, Range<usize>, ExcerptId, Option<Anchor>)> + '_ {
3956 let start = range.start.to_offset(self);
3957 let end = range.end.to_offset(self);
3958
3959 let mut cursor = self.cursor::<usize>();
3960 cursor.seek(&start);
3961
3962 std::iter::from_fn(move || {
3963 let region = cursor.region()?;
3964 if region.range.start > end {
3965 return None;
3966 }
3967 let start_overshoot = start.saturating_sub(region.range.start);
3968 let end_overshoot = end.saturating_sub(region.range.start);
3969 let start = region
3970 .buffer_range
3971 .end
3972 .min(region.buffer_range.start + start_overshoot);
3973 let end = region
3974 .buffer_range
3975 .end
3976 .min(region.buffer_range.start + end_overshoot);
3977
3978 let region_excerpt_id = region.excerpt.id;
3979 let deleted_hunk_anchor = if region.is_main_buffer {
3980 None
3981 } else {
3982 Some(self.anchor_before(region.range.start))
3983 };
3984 let result = (
3985 region.buffer,
3986 start..end,
3987 region_excerpt_id,
3988 deleted_hunk_anchor,
3989 );
3990 cursor.next();
3991 Some(result)
3992 })
3993 }
3994
3995 /// Retrieves buffer metadata for the given range, and converts it into multi-buffer
3996 /// coordinates.
3997 ///
3998 /// The given callback will be called for every excerpt intersecting the given range. It will
3999 /// be passed the excerpt's buffer and the buffer range that the input range intersects.
4000 /// The callback should return an iterator of metadata items from that buffer, each paired
4001 /// with a buffer range.
4002 ///
4003 /// The returned iterator yields each of these metadata items, paired with its range in
4004 /// multi-buffer coordinates.
4005 fn lift_buffer_metadata<'a, D, M, I>(
4006 &'a self,
4007 query_range: Range<D>,
4008 get_buffer_metadata: impl 'a + Fn(&'a BufferSnapshot, Range<D>) -> Option<I>,
4009 ) -> impl Iterator<Item = (Range<D>, M, &'a Excerpt)> + 'a
4010 where
4011 I: Iterator<Item = (Range<D>, M)> + 'a,
4012 D: TextDimension + Ord + Sub<D, Output = D>,
4013 {
4014 let max_position = D::from_text_summary(&self.text_summary());
4015 let mut current_excerpt_metadata: Option<(ExcerptId, I)> = None;
4016 let mut cursor = self.cursor::<D>();
4017
4018 // Find the excerpt and buffer offset where the given range ends.
4019 cursor.seek(&query_range.end);
4020 let mut range_end = None;
4021 while let Some(region) = cursor.region() {
4022 if region.is_main_buffer {
4023 let mut buffer_end = region.buffer_range.start;
4024 let overshoot = if query_range.end > region.range.start {
4025 query_range.end - region.range.start
4026 } else {
4027 D::default()
4028 };
4029 buffer_end.add_assign(&overshoot);
4030 range_end = Some((region.excerpt.id, buffer_end));
4031 break;
4032 }
4033 cursor.next();
4034 }
4035
4036 cursor.seek(&query_range.start);
4037
4038 if let Some(region) = cursor.region().filter(|region| !region.is_main_buffer)
4039 && region.range.start > D::zero(&())
4040 {
4041 cursor.prev()
4042 }
4043
4044 iter::from_fn(move || {
4045 loop {
4046 let excerpt = cursor.excerpt()?;
4047
4048 // If we have already retrieved metadata for this excerpt, continue to use it.
4049 let metadata_iter = if let Some((_, metadata)) = current_excerpt_metadata
4050 .as_mut()
4051 .filter(|(excerpt_id, _)| *excerpt_id == excerpt.id)
4052 {
4053 Some(metadata)
4054 }
4055 // Otherwise, compute the intersection of the input range with the excerpt's range,
4056 // and retrieve the metadata for the resulting range.
4057 else {
4058 let region = cursor.region()?;
4059 let mut buffer_start;
4060 if region.is_main_buffer {
4061 buffer_start = region.buffer_range.start;
4062 if query_range.start > region.range.start {
4063 let overshoot = query_range.start - region.range.start;
4064 buffer_start.add_assign(&overshoot);
4065 }
4066 buffer_start = buffer_start.min(region.buffer_range.end);
4067 } else {
4068 buffer_start = cursor.main_buffer_position()?;
4069 };
4070 let mut buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
4071 if let Some((end_excerpt_id, end_buffer_offset)) = range_end
4072 && excerpt.id == end_excerpt_id
4073 {
4074 buffer_end = buffer_end.min(end_buffer_offset);
4075 }
4076
4077 get_buffer_metadata(&excerpt.buffer, buffer_start..buffer_end).map(|iterator| {
4078 &mut current_excerpt_metadata.insert((excerpt.id, iterator)).1
4079 })
4080 };
4081
4082 // Visit each metadata item.
4083 if let Some((metadata_buffer_range, metadata)) =
4084 metadata_iter.and_then(Iterator::next)
4085 {
4086 // Find the multibuffer regions that contain the start and end of
4087 // the metadata item's range.
4088 if metadata_buffer_range.start > D::default() {
4089 while let Some(region) = cursor.region() {
4090 if region.is_main_buffer
4091 && (region.buffer_range.end >= metadata_buffer_range.start
4092 || cursor.is_at_end_of_excerpt())
4093 {
4094 break;
4095 }
4096 cursor.next();
4097 }
4098 }
4099 let start_region = cursor.region()?;
4100 while let Some(region) = cursor.region() {
4101 if region.is_main_buffer
4102 && (region.buffer_range.end > metadata_buffer_range.end
4103 || cursor.is_at_end_of_excerpt())
4104 {
4105 break;
4106 }
4107 cursor.next();
4108 }
4109 let end_region = cursor.region();
4110
4111 // Convert the metadata item's range into multibuffer coordinates.
4112 let mut start_position = start_region.range.start;
4113 let region_buffer_start = start_region.buffer_range.start;
4114 if start_region.is_main_buffer
4115 && metadata_buffer_range.start > region_buffer_start
4116 {
4117 start_position
4118 .add_assign(&(metadata_buffer_range.start - region_buffer_start));
4119 start_position = start_position.min(start_region.range.end);
4120 }
4121
4122 let mut end_position = max_position;
4123 if let Some(end_region) = &end_region {
4124 end_position = end_region.range.start;
4125 debug_assert!(end_region.is_main_buffer);
4126 let region_buffer_start = end_region.buffer_range.start;
4127 if metadata_buffer_range.end > region_buffer_start {
4128 end_position
4129 .add_assign(&(metadata_buffer_range.end - region_buffer_start));
4130 }
4131 end_position = end_position.min(end_region.range.end);
4132 }
4133
4134 if start_position <= query_range.end && end_position >= query_range.start {
4135 return Some((start_position..end_position, metadata, excerpt));
4136 }
4137 }
4138 // When there are no more metadata items for this excerpt, move to the next excerpt.
4139 else {
4140 current_excerpt_metadata.take();
4141 if let Some((end_excerpt_id, _)) = range_end
4142 && excerpt.id == end_excerpt_id
4143 {
4144 return None;
4145 }
4146 cursor.next_excerpt();
4147 }
4148 }
4149 })
4150 }
4151
4152 pub fn diff_hunk_before<T: ToOffset>(&self, position: T) -> Option<MultiBufferRow> {
4153 let offset = position.to_offset(self);
4154
4155 let mut cursor = self.cursor::<DimensionPair<usize, Point>>();
4156 cursor.seek(&DimensionPair {
4157 key: offset,
4158 value: None,
4159 });
4160 cursor.seek_to_start_of_current_excerpt();
4161 let excerpt = cursor.excerpt()?;
4162
4163 let excerpt_end = excerpt.range.context.end.to_offset(&excerpt.buffer);
4164 let current_position = self
4165 .anchor_before(offset)
4166 .text_anchor
4167 .to_offset(&excerpt.buffer);
4168 let excerpt_end = excerpt
4169 .buffer
4170 .anchor_before(excerpt_end.min(current_position));
4171
4172 if let Some(diff) = self.diffs.get(&excerpt.buffer_id) {
4173 for hunk in diff.hunks_intersecting_range_rev(
4174 excerpt.range.context.start..excerpt_end,
4175 &excerpt.buffer,
4176 ) {
4177 let hunk_end = hunk.buffer_range.end.to_offset(&excerpt.buffer);
4178 if hunk_end >= current_position {
4179 continue;
4180 }
4181 let start =
4182 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, hunk.buffer_range.start)
4183 .to_point(self);
4184 return Some(MultiBufferRow(start.row));
4185 }
4186 }
4187
4188 loop {
4189 cursor.prev_excerpt();
4190 let excerpt = cursor.excerpt()?;
4191
4192 let Some(diff) = self.diffs.get(&excerpt.buffer_id) else {
4193 continue;
4194 };
4195 let mut hunks =
4196 diff.hunks_intersecting_range_rev(excerpt.range.context.clone(), &excerpt.buffer);
4197 let Some(hunk) = hunks.next() else {
4198 continue;
4199 };
4200 let start = Anchor::in_buffer(excerpt.id, excerpt.buffer_id, hunk.buffer_range.start)
4201 .to_point(self);
4202 return Some(MultiBufferRow(start.row));
4203 }
4204 }
4205
4206 pub fn has_diff_hunks(&self) -> bool {
4207 self.diffs.values().any(|diff| !diff.is_empty())
4208 }
4209
4210 pub fn is_inside_word<T: ToOffset>(&self, position: T, for_completion: bool) -> bool {
4211 let position = position.to_offset(self);
4212 let classifier = self
4213 .char_classifier_at(position)
4214 .for_completion(for_completion);
4215 let next_char_kind = self.chars_at(position).next().map(|c| classifier.kind(c));
4216 let prev_char_kind = self
4217 .reversed_chars_at(position)
4218 .next()
4219 .map(|c| classifier.kind(c));
4220 prev_char_kind.zip(next_char_kind) == Some((CharKind::Word, CharKind::Word))
4221 }
4222
4223 pub fn surrounding_word<T: ToOffset>(
4224 &self,
4225 start: T,
4226 for_completion: bool,
4227 ) -> (Range<usize>, Option<CharKind>) {
4228 let mut start = start.to_offset(self);
4229 let mut end = start;
4230 let mut next_chars = self.chars_at(start).peekable();
4231 let mut prev_chars = self.reversed_chars_at(start).peekable();
4232
4233 let classifier = self
4234 .char_classifier_at(start)
4235 .for_completion(for_completion);
4236
4237 let word_kind = cmp::max(
4238 prev_chars.peek().copied().map(|c| classifier.kind(c)),
4239 next_chars.peek().copied().map(|c| classifier.kind(c)),
4240 );
4241
4242 for ch in prev_chars {
4243 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4244 start -= ch.len_utf8();
4245 } else {
4246 break;
4247 }
4248 }
4249
4250 for ch in next_chars {
4251 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4252 end += ch.len_utf8();
4253 } else {
4254 break;
4255 }
4256 }
4257
4258 (start..end, word_kind)
4259 }
4260
4261 pub fn char_kind_before<T: ToOffset>(
4262 &self,
4263 start: T,
4264 for_completion: bool,
4265 ) -> Option<CharKind> {
4266 let start = start.to_offset(self);
4267 let classifier = self
4268 .char_classifier_at(start)
4269 .for_completion(for_completion);
4270 self.reversed_chars_at(start)
4271 .next()
4272 .map(|ch| classifier.kind(ch))
4273 }
4274
4275 pub fn is_singleton(&self) -> bool {
4276 self.singleton
4277 }
4278
4279 pub fn as_singleton(&self) -> Option<(&ExcerptId, BufferId, &BufferSnapshot)> {
4280 if self.singleton {
4281 self.excerpts
4282 .iter()
4283 .next()
4284 .map(|e| (&e.id, e.buffer_id, &e.buffer))
4285 } else {
4286 None
4287 }
4288 }
4289
4290 pub fn len(&self) -> usize {
4291 self.diff_transforms.summary().output.len
4292 }
4293
4294 pub fn is_empty(&self) -> bool {
4295 self.excerpts.summary().text.len == 0
4296 }
4297
4298 pub fn widest_line_number(&self) -> u32 {
4299 // widest_line_number is 0-based, so 1 is added to get the displayed line number.
4300 self.excerpts.summary().widest_line_number + 1
4301 }
4302
4303 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes<'_> {
4304 let range = range.start.to_offset(self)..range.end.to_offset(self);
4305 let mut excerpts = self.cursor::<usize>();
4306 excerpts.seek(&range.start);
4307
4308 let mut chunk;
4309 let mut has_trailing_newline;
4310 let excerpt_bytes;
4311 if let Some(region) = excerpts.region() {
4312 let mut bytes = region.buffer.bytes_in_range(
4313 region.buffer_range.start + range.start - region.range.start
4314 ..(region.buffer_range.start + range.end - region.range.start)
4315 .min(region.buffer_range.end),
4316 );
4317 chunk = bytes.next().unwrap_or(&[][..]);
4318 excerpt_bytes = Some(bytes);
4319 has_trailing_newline = region.has_trailing_newline && range.end >= region.range.end;
4320 if chunk.is_empty() && has_trailing_newline {
4321 chunk = b"\n";
4322 has_trailing_newline = false;
4323 }
4324 } else {
4325 chunk = &[][..];
4326 excerpt_bytes = None;
4327 has_trailing_newline = false;
4328 };
4329
4330 MultiBufferBytes {
4331 range,
4332 cursor: excerpts,
4333 excerpt_bytes,
4334 has_trailing_newline,
4335 chunk,
4336 }
4337 }
4338
4339 pub fn reversed_bytes_in_range<T: ToOffset>(
4340 &self,
4341 range: Range<T>,
4342 ) -> ReversedMultiBufferBytes<'_> {
4343 let range = range.start.to_offset(self)..range.end.to_offset(self);
4344 let mut chunks = self.reversed_chunks_in_range(range.clone());
4345 let chunk = chunks.next().map_or(&[][..], |c| c.as_bytes());
4346 ReversedMultiBufferBytes {
4347 range,
4348 chunks,
4349 chunk,
4350 }
4351 }
4352
4353 pub fn row_infos(&self, start_row: MultiBufferRow) -> MultiBufferRows<'_> {
4354 let mut cursor = self.cursor::<Point>();
4355 cursor.seek(&Point::new(start_row.0, 0));
4356 let mut result = MultiBufferRows {
4357 point: Point::new(0, 0),
4358 is_empty: self.excerpts.is_empty(),
4359 is_singleton: self.is_singleton(),
4360 cursor,
4361 };
4362 result.seek(start_row);
4363 result
4364 }
4365
4366 pub fn chunks<T: ToOffset>(
4367 &self,
4368 range: Range<T>,
4369 language_aware: bool,
4370 ) -> MultiBufferChunks<'_> {
4371 let mut chunks = MultiBufferChunks {
4372 excerpt_offset_range: ExcerptOffset::new(0)..ExcerptOffset::new(0),
4373 range: 0..0,
4374 excerpts: self.excerpts.cursor(&()),
4375 diff_transforms: self.diff_transforms.cursor(&()),
4376 diffs: &self.diffs,
4377 diff_base_chunks: None,
4378 excerpt_chunks: None,
4379 buffer_chunk: None,
4380 language_aware,
4381 };
4382 let range = range.start.to_offset(self)..range.end.to_offset(self);
4383 chunks.seek(range);
4384 chunks
4385 }
4386
4387 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
4388 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset)
4389 }
4390
4391 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
4392 self.clip_dimension(point, bias, text::BufferSnapshot::clip_point)
4393 }
4394
4395 pub fn clip_offset_utf16(&self, offset: OffsetUtf16, bias: Bias) -> OffsetUtf16 {
4396 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset_utf16)
4397 }
4398
4399 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
4400 self.clip_dimension(point.0, bias, |buffer, point, bias| {
4401 buffer.clip_point_utf16(Unclipped(point), bias)
4402 })
4403 }
4404
4405 pub fn offset_to_point(&self, offset: usize) -> Point {
4406 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point)
4407 }
4408
4409 pub fn offset_to_point_utf16(&self, offset: usize) -> PointUtf16 {
4410 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point_utf16)
4411 }
4412
4413 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
4414 self.convert_dimension(point, text::BufferSnapshot::point_to_point_utf16)
4415 }
4416
4417 pub fn point_to_offset(&self, point: Point) -> usize {
4418 self.convert_dimension(point, text::BufferSnapshot::point_to_offset)
4419 }
4420
4421 pub fn offset_utf16_to_offset(&self, offset: OffsetUtf16) -> usize {
4422 self.convert_dimension(offset, text::BufferSnapshot::offset_utf16_to_offset)
4423 }
4424
4425 pub fn offset_to_offset_utf16(&self, offset: usize) -> OffsetUtf16 {
4426 self.convert_dimension(offset, text::BufferSnapshot::offset_to_offset_utf16)
4427 }
4428
4429 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
4430 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_offset)
4431 }
4432
4433 fn clip_dimension<D>(
4434 &self,
4435 position: D,
4436 bias: Bias,
4437 clip_buffer_position: fn(&text::BufferSnapshot, D, Bias) -> D,
4438 ) -> D
4439 where
4440 D: TextDimension + Ord + Sub<D, Output = D>,
4441 {
4442 let mut cursor = self.cursor();
4443 cursor.seek(&position);
4444 if let Some(region) = cursor.region() {
4445 if position >= region.range.end {
4446 return region.range.end;
4447 }
4448 let overshoot = position - region.range.start;
4449 let mut buffer_position = region.buffer_range.start;
4450 buffer_position.add_assign(&overshoot);
4451 let clipped_buffer_position =
4452 clip_buffer_position(region.buffer, buffer_position, bias);
4453 let mut position = region.range.start;
4454 position.add_assign(&(clipped_buffer_position - region.buffer_range.start));
4455 position
4456 } else {
4457 D::from_text_summary(&self.text_summary())
4458 }
4459 }
4460
4461 fn convert_dimension<D1, D2>(
4462 &self,
4463 key: D1,
4464 convert_buffer_dimension: fn(&text::BufferSnapshot, D1) -> D2,
4465 ) -> D2
4466 where
4467 D1: TextDimension + Ord + Sub<D1, Output = D1>,
4468 D2: TextDimension + Ord + Sub<D2, Output = D2>,
4469 {
4470 let mut cursor = self.cursor::<DimensionPair<D1, D2>>();
4471 cursor.seek(&DimensionPair { key, value: None });
4472 if let Some(region) = cursor.region() {
4473 if key >= region.range.end.key {
4474 return region.range.end.value.unwrap();
4475 }
4476 let start_key = region.range.start.key;
4477 let start_value = region.range.start.value.unwrap();
4478 let buffer_start_key = region.buffer_range.start.key;
4479 let buffer_start_value = region.buffer_range.start.value.unwrap();
4480 let mut buffer_key = buffer_start_key;
4481 buffer_key.add_assign(&(key - start_key));
4482 let buffer_value = convert_buffer_dimension(region.buffer, buffer_key);
4483 let mut result = start_value;
4484 result.add_assign(&(buffer_value - buffer_start_value));
4485 result
4486 } else {
4487 D2::from_text_summary(&self.text_summary())
4488 }
4489 }
4490
4491 pub fn point_to_buffer_offset<T: ToOffset>(
4492 &self,
4493 point: T,
4494 ) -> Option<(&BufferSnapshot, usize)> {
4495 let offset = point.to_offset(self);
4496 let mut cursor = self.cursor::<usize>();
4497 cursor.seek(&offset);
4498 let region = cursor.region()?;
4499 let overshoot = offset - region.range.start;
4500 let buffer_offset = region.buffer_range.start + overshoot;
4501 if buffer_offset == region.buffer.len() + 1
4502 && region.has_trailing_newline
4503 && !region.is_main_buffer
4504 {
4505 return Some((&cursor.excerpt()?.buffer, cursor.main_buffer_position()?));
4506 } else if buffer_offset > region.buffer.len() {
4507 return None;
4508 }
4509 Some((region.buffer, buffer_offset))
4510 }
4511
4512 pub fn point_to_buffer_point(
4513 &self,
4514 point: Point,
4515 ) -> Option<(&BufferSnapshot, Point, ExcerptId)> {
4516 let mut cursor = self.cursor::<Point>();
4517 cursor.seek(&point);
4518 let region = cursor.region()?;
4519 let overshoot = point - region.range.start;
4520 let buffer_point = region.buffer_range.start + overshoot;
4521 let excerpt = cursor.excerpt()?;
4522 if buffer_point == region.buffer.max_point() + Point::new(1, 0)
4523 && region.has_trailing_newline
4524 && !region.is_main_buffer
4525 {
4526 return Some((&excerpt.buffer, cursor.main_buffer_position()?, excerpt.id));
4527 } else if buffer_point > region.buffer.max_point() {
4528 return None;
4529 }
4530 Some((region.buffer, buffer_point, excerpt.id))
4531 }
4532
4533 pub fn suggested_indents(
4534 &self,
4535 rows: impl IntoIterator<Item = u32>,
4536 cx: &App,
4537 ) -> BTreeMap<MultiBufferRow, IndentSize> {
4538 let mut result = BTreeMap::new();
4539
4540 let mut rows_for_excerpt = Vec::new();
4541 let mut cursor = self.cursor::<Point>();
4542 let mut rows = rows.into_iter().peekable();
4543 let mut prev_row = u32::MAX;
4544 let mut prev_language_indent_size = IndentSize::default();
4545
4546 while let Some(row) = rows.next() {
4547 cursor.seek(&Point::new(row, 0));
4548 let Some(region) = cursor.region() else {
4549 continue;
4550 };
4551
4552 // Retrieve the language and indent size once for each disjoint region being indented.
4553 let single_indent_size = if row.saturating_sub(1) == prev_row {
4554 prev_language_indent_size
4555 } else {
4556 region
4557 .buffer
4558 .language_indent_size_at(Point::new(row, 0), cx)
4559 };
4560 prev_language_indent_size = single_indent_size;
4561 prev_row = row;
4562
4563 let start_buffer_row = region.buffer_range.start.row;
4564 let start_multibuffer_row = region.range.start.row;
4565 let end_multibuffer_row = region.range.end.row;
4566
4567 rows_for_excerpt.push(row);
4568 while let Some(next_row) = rows.peek().copied() {
4569 if end_multibuffer_row > next_row {
4570 rows_for_excerpt.push(next_row);
4571 rows.next();
4572 } else {
4573 break;
4574 }
4575 }
4576
4577 let buffer_rows = rows_for_excerpt
4578 .drain(..)
4579 .map(|row| start_buffer_row + row - start_multibuffer_row);
4580 let buffer_indents = region
4581 .buffer
4582 .suggested_indents(buffer_rows, single_indent_size);
4583 let multibuffer_indents = buffer_indents.into_iter().map(|(row, indent)| {
4584 (
4585 MultiBufferRow(start_multibuffer_row + row - start_buffer_row),
4586 indent,
4587 )
4588 });
4589 result.extend(multibuffer_indents);
4590 }
4591
4592 result
4593 }
4594
4595 pub fn indent_size_for_line(&self, row: MultiBufferRow) -> IndentSize {
4596 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4597 let mut size = buffer.indent_size_for_line(range.start.row);
4598 size.len = size
4599 .len
4600 .min(range.end.column)
4601 .saturating_sub(range.start.column);
4602 size
4603 } else {
4604 IndentSize::spaces(0)
4605 }
4606 }
4607
4608 pub fn line_indent_for_row(&self, row: MultiBufferRow) -> LineIndent {
4609 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4610 LineIndent::from_iter(buffer.text_for_range(range).flat_map(|s| s.chars()))
4611 } else {
4612 LineIndent::spaces(0)
4613 }
4614 }
4615
4616 pub fn indent_and_comment_for_line(&self, row: MultiBufferRow, cx: &App) -> String {
4617 let mut indent = self.indent_size_for_line(row).chars().collect::<String>();
4618
4619 if self.language_settings(cx).extend_comment_on_newline
4620 && let Some(language_scope) = self.language_scope_at(Point::new(row.0, 0))
4621 {
4622 let delimiters = language_scope.line_comment_prefixes();
4623 for delimiter in delimiters {
4624 if *self
4625 .chars_at(Point::new(row.0, indent.len() as u32))
4626 .take(delimiter.chars().count())
4627 .collect::<String>()
4628 .as_str()
4629 == **delimiter
4630 {
4631 indent.push_str(delimiter);
4632 break;
4633 }
4634 }
4635 }
4636
4637 indent
4638 }
4639
4640 pub fn is_line_whitespace_upto<T>(&self, position: T) -> bool
4641 where
4642 T: ToOffset,
4643 {
4644 for char in self.reversed_chars_at(position) {
4645 if !char.is_whitespace() {
4646 return false;
4647 }
4648 if char == '\n' {
4649 return true;
4650 }
4651 }
4652 true
4653 }
4654
4655 pub fn prev_non_blank_row(&self, mut row: MultiBufferRow) -> Option<MultiBufferRow> {
4656 while row.0 > 0 {
4657 row.0 -= 1;
4658 if !self.is_line_blank(row) {
4659 return Some(row);
4660 }
4661 }
4662 None
4663 }
4664
4665 pub fn line_len(&self, row: MultiBufferRow) -> u32 {
4666 if let Some((_, range)) = self.buffer_line_for_row(row) {
4667 range.end.column - range.start.column
4668 } else {
4669 0
4670 }
4671 }
4672
4673 pub fn buffer_line_for_row(
4674 &self,
4675 row: MultiBufferRow,
4676 ) -> Option<(&BufferSnapshot, Range<Point>)> {
4677 let mut cursor = self.cursor::<Point>();
4678 let point = Point::new(row.0, 0);
4679 cursor.seek(&point);
4680 let region = cursor.region()?;
4681 let overshoot = point.min(region.range.end) - region.range.start;
4682 let buffer_point = region.buffer_range.start + overshoot;
4683 if buffer_point.row > region.buffer_range.end.row {
4684 return None;
4685 }
4686 let line_start = Point::new(buffer_point.row, 0).max(region.buffer_range.start);
4687 let line_end = Point::new(buffer_point.row, region.buffer.line_len(buffer_point.row))
4688 .min(region.buffer_range.end);
4689 Some((region.buffer, line_start..line_end))
4690 }
4691
4692 pub fn max_point(&self) -> Point {
4693 self.text_summary().lines
4694 }
4695
4696 pub fn max_row(&self) -> MultiBufferRow {
4697 MultiBufferRow(self.text_summary().lines.row)
4698 }
4699
4700 pub fn text_summary(&self) -> TextSummary {
4701 self.diff_transforms.summary().output
4702 }
4703
4704 pub fn text_summary_for_range<D, O>(&self, range: Range<O>) -> D
4705 where
4706 D: TextDimension,
4707 O: ToOffset,
4708 {
4709 let range = range.start.to_offset(self)..range.end.to_offset(self);
4710 let mut cursor = self
4711 .diff_transforms
4712 .cursor::<Dimensions<usize, ExcerptOffset>>(&());
4713 cursor.seek(&range.start, Bias::Right);
4714
4715 let Some(first_transform) = cursor.item() else {
4716 return D::from_text_summary(&TextSummary::default());
4717 };
4718
4719 let diff_transform_start = cursor.start().0;
4720 let diff_transform_end = cursor.end().0;
4721 let diff_start = range.start;
4722 let start_overshoot = diff_start - diff_transform_start;
4723 let end_overshoot = std::cmp::min(range.end, diff_transform_end) - diff_transform_start;
4724
4725 let mut result = match first_transform {
4726 DiffTransform::BufferContent { .. } => {
4727 let excerpt_start = cursor.start().1 + ExcerptOffset::new(start_overshoot);
4728 let excerpt_end = cursor.start().1 + ExcerptOffset::new(end_overshoot);
4729 self.text_summary_for_excerpt_offset_range(excerpt_start..excerpt_end)
4730 }
4731 DiffTransform::DeletedHunk {
4732 buffer_id,
4733 base_text_byte_range,
4734 has_trailing_newline,
4735 ..
4736 } => {
4737 let buffer_start = base_text_byte_range.start + start_overshoot;
4738 let mut buffer_end = base_text_byte_range.start + end_overshoot;
4739 let Some(base_text) = self.diffs.get(buffer_id).map(|diff| diff.base_text()) else {
4740 panic!("{:?} is in non-existent deleted hunk", range.start)
4741 };
4742
4743 let include_trailing_newline =
4744 *has_trailing_newline && range.end >= diff_transform_end;
4745 if include_trailing_newline {
4746 buffer_end -= 1;
4747 }
4748
4749 let mut summary =
4750 base_text.text_summary_for_range::<D, _>(buffer_start..buffer_end);
4751
4752 if include_trailing_newline {
4753 summary.add_assign(&D::from_text_summary(&TextSummary::newline()))
4754 }
4755
4756 summary
4757 }
4758 };
4759 if range.end < diff_transform_end {
4760 return result;
4761 }
4762
4763 cursor.next();
4764 result.add_assign(&D::from_text_summary(
4765 &cursor.summary(&range.end, Bias::Right),
4766 ));
4767
4768 let Some(last_transform) = cursor.item() else {
4769 return result;
4770 };
4771
4772 let overshoot = range.end - cursor.start().0;
4773 let suffix = match last_transform {
4774 DiffTransform::BufferContent { .. } => {
4775 let end = cursor.start().1 + ExcerptOffset::new(overshoot);
4776 self.text_summary_for_excerpt_offset_range::<D>(cursor.start().1..end)
4777 }
4778 DiffTransform::DeletedHunk {
4779 base_text_byte_range,
4780 buffer_id,
4781 has_trailing_newline,
4782 ..
4783 } => {
4784 let buffer_end = base_text_byte_range.start + overshoot;
4785 let Some(base_text) = self.diffs.get(buffer_id).map(|diff| diff.base_text()) else {
4786 panic!("{:?} is in non-existent deleted hunk", range.end)
4787 };
4788
4789 let mut suffix = base_text
4790 .text_summary_for_range::<D, _>(base_text_byte_range.start..buffer_end);
4791 if *has_trailing_newline && buffer_end == base_text_byte_range.end + 1 {
4792 suffix.add_assign(&D::from_text_summary(&TextSummary::newline()))
4793 }
4794 suffix
4795 }
4796 };
4797
4798 result.add_assign(&suffix);
4799 result
4800 }
4801
4802 fn text_summary_for_excerpt_offset_range<D>(&self, mut range: Range<ExcerptOffset>) -> D
4803 where
4804 D: TextDimension,
4805 {
4806 // let mut range = range.start..range.end;
4807 let mut summary = D::zero(&());
4808 let mut cursor = self.excerpts.cursor::<ExcerptOffset>(&());
4809 cursor.seek(&range.start, Bias::Right);
4810 if let Some(excerpt) = cursor.item() {
4811 let mut end_before_newline = cursor.end();
4812 if excerpt.has_trailing_newline {
4813 end_before_newline -= ExcerptOffset::new(1);
4814 }
4815
4816 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
4817 let start_in_excerpt = excerpt_start + (range.start - *cursor.start()).value;
4818 let end_in_excerpt =
4819 excerpt_start + (cmp::min(end_before_newline, range.end) - *cursor.start()).value;
4820 summary.add_assign(
4821 &excerpt
4822 .buffer
4823 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
4824 );
4825
4826 if range.end > end_before_newline {
4827 summary.add_assign(&D::from_text_summary(&TextSummary::from("\n")));
4828 }
4829
4830 cursor.next();
4831 }
4832
4833 if range.end > *cursor.start() {
4834 summary.add_assign(
4835 &cursor
4836 .summary::<_, ExcerptDimension<D>>(&range.end, Bias::Right)
4837 .0,
4838 );
4839 if let Some(excerpt) = cursor.item() {
4840 range.end = cmp::max(*cursor.start(), range.end);
4841
4842 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
4843 let end_in_excerpt = excerpt_start + (range.end - *cursor.start()).value;
4844 summary.add_assign(
4845 &excerpt
4846 .buffer
4847 .text_summary_for_range(excerpt_start..end_in_excerpt),
4848 );
4849 }
4850 }
4851
4852 summary
4853 }
4854
4855 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
4856 where
4857 D: TextDimension + Ord + Sub<D, Output = D>,
4858 {
4859 self.summaries_for_anchors([anchor])[0]
4860 }
4861
4862 fn resolve_summary_for_anchor<D>(
4863 &self,
4864 anchor: &Anchor,
4865 excerpt_position: D,
4866 diff_transforms: &mut Cursor<
4867 DiffTransform,
4868 Dimensions<ExcerptDimension<D>, OutputDimension<D>>,
4869 >,
4870 ) -> D
4871 where
4872 D: TextDimension + Ord + Sub<D, Output = D>,
4873 {
4874 loop {
4875 let transform_end_position = diff_transforms.end().0.0;
4876 let at_transform_end =
4877 excerpt_position == transform_end_position && diff_transforms.item().is_some();
4878 if at_transform_end && anchor.text_anchor.bias == Bias::Right {
4879 diff_transforms.next();
4880 continue;
4881 }
4882
4883 let mut position = diff_transforms.start().1.0;
4884 match diff_transforms.item() {
4885 Some(DiffTransform::DeletedHunk {
4886 buffer_id,
4887 base_text_byte_range,
4888 ..
4889 }) => {
4890 if let Some(diff_base_anchor) = &anchor.diff_base_anchor
4891 && let Some(base_text) =
4892 self.diffs.get(buffer_id).map(|diff| diff.base_text())
4893 && base_text.can_resolve(diff_base_anchor)
4894 {
4895 let base_text_offset = diff_base_anchor.to_offset(base_text);
4896 if base_text_offset >= base_text_byte_range.start
4897 && base_text_offset <= base_text_byte_range.end
4898 {
4899 let position_in_hunk = base_text.text_summary_for_range::<D, _>(
4900 base_text_byte_range.start..base_text_offset,
4901 );
4902 position.add_assign(&position_in_hunk);
4903 } else if at_transform_end {
4904 diff_transforms.next();
4905 continue;
4906 }
4907 }
4908 }
4909 _ => {
4910 if at_transform_end && anchor.diff_base_anchor.is_some() {
4911 diff_transforms.next();
4912 continue;
4913 }
4914 let overshoot = excerpt_position - diff_transforms.start().0.0;
4915 position.add_assign(&overshoot);
4916 }
4917 }
4918
4919 return position;
4920 }
4921 }
4922
4923 fn excerpt_offset_for_anchor(&self, anchor: &Anchor) -> ExcerptOffset {
4924 let mut cursor = self
4925 .excerpts
4926 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(&());
4927 let locator = self.excerpt_locator_for_id(anchor.excerpt_id);
4928
4929 cursor.seek(&Some(locator), Bias::Left);
4930 if cursor.item().is_none() {
4931 cursor.next();
4932 }
4933
4934 let mut position = cursor.start().1;
4935 if let Some(excerpt) = cursor.item()
4936 && excerpt.id == anchor.excerpt_id
4937 {
4938 let excerpt_buffer_start = excerpt
4939 .buffer
4940 .offset_for_anchor(&excerpt.range.context.start);
4941 let excerpt_buffer_end = excerpt.buffer.offset_for_anchor(&excerpt.range.context.end);
4942 let buffer_position = cmp::min(
4943 excerpt_buffer_end,
4944 excerpt.buffer.offset_for_anchor(&anchor.text_anchor),
4945 );
4946 if buffer_position > excerpt_buffer_start {
4947 position.value += buffer_position - excerpt_buffer_start;
4948 }
4949 }
4950 position
4951 }
4952
4953 pub fn latest_excerpt_id(&self, mut excerpt_id: ExcerptId) -> ExcerptId {
4954 while let Some(replacement) = self.replaced_excerpts.get(&excerpt_id) {
4955 excerpt_id = *replacement;
4956 }
4957 excerpt_id
4958 }
4959
4960 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
4961 where
4962 D: TextDimension + Ord + Sub<D, Output = D>,
4963 I: 'a + IntoIterator<Item = &'a Anchor>,
4964 {
4965 let mut anchors = anchors.into_iter().peekable();
4966 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(&());
4967 let mut diff_transforms_cursor = self
4968 .diff_transforms
4969 .cursor::<Dimensions<ExcerptDimension<D>, OutputDimension<D>>>(&());
4970 diff_transforms_cursor.next();
4971
4972 let mut summaries = Vec::new();
4973 while let Some(anchor) = anchors.peek() {
4974 let excerpt_id = self.latest_excerpt_id(anchor.excerpt_id);
4975 let excerpt_anchors = iter::from_fn(|| {
4976 let anchor = anchors.peek()?;
4977 if self.latest_excerpt_id(anchor.excerpt_id) == excerpt_id {
4978 Some(anchors.next().unwrap())
4979 } else {
4980 None
4981 }
4982 });
4983
4984 let locator = self.excerpt_locator_for_id(excerpt_id);
4985 cursor.seek_forward(locator, Bias::Left);
4986 if cursor.item().is_none() {
4987 cursor.next();
4988 }
4989
4990 let excerpt_start_position = D::from_text_summary(&cursor.start().text);
4991 if let Some(excerpt) = cursor.item() {
4992 if excerpt.id != excerpt_id {
4993 let position = self.resolve_summary_for_anchor(
4994 &Anchor::min(),
4995 excerpt_start_position,
4996 &mut diff_transforms_cursor,
4997 );
4998 summaries.extend(excerpt_anchors.map(|_| position));
4999 continue;
5000 }
5001 let excerpt_buffer_start =
5002 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
5003 let excerpt_buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
5004 for (buffer_summary, anchor) in excerpt
5005 .buffer
5006 .summaries_for_anchors_with_payload::<D, _, _>(
5007 excerpt_anchors.map(|a| (&a.text_anchor, a)),
5008 )
5009 {
5010 let summary = cmp::min(excerpt_buffer_end, buffer_summary);
5011 let mut position = excerpt_start_position;
5012 if summary > excerpt_buffer_start {
5013 position.add_assign(&(summary - excerpt_buffer_start));
5014 }
5015
5016 if position > diff_transforms_cursor.start().0.0 {
5017 diff_transforms_cursor
5018 .seek_forward(&ExcerptDimension(position), Bias::Left);
5019 }
5020
5021 summaries.push(self.resolve_summary_for_anchor(
5022 anchor,
5023 position,
5024 &mut diff_transforms_cursor,
5025 ));
5026 }
5027 } else {
5028 diff_transforms_cursor
5029 .seek_forward(&ExcerptDimension(excerpt_start_position), Bias::Left);
5030 let position = self.resolve_summary_for_anchor(
5031 &Anchor::max(),
5032 excerpt_start_position,
5033 &mut diff_transforms_cursor,
5034 );
5035 summaries.extend(excerpt_anchors.map(|_| position));
5036 }
5037 }
5038
5039 summaries
5040 }
5041
5042 pub fn dimensions_from_points<'a, D>(
5043 &'a self,
5044 points: impl 'a + IntoIterator<Item = Point>,
5045 ) -> impl 'a + Iterator<Item = D>
5046 where
5047 D: TextDimension + Sub<D, Output = D>,
5048 {
5049 let mut cursor = self.cursor::<DimensionPair<Point, D>>();
5050 cursor.seek(&DimensionPair {
5051 key: Point::default(),
5052 value: None,
5053 });
5054 let mut points = points.into_iter();
5055 iter::from_fn(move || {
5056 let point = points.next()?;
5057
5058 cursor.seek_forward(&DimensionPair {
5059 key: point,
5060 value: None,
5061 });
5062
5063 if let Some(region) = cursor.region() {
5064 let overshoot = point - region.range.start.key;
5065 let buffer_point = region.buffer_range.start.key + overshoot;
5066 let mut position = region.range.start.value.unwrap();
5067 position.add_assign(
5068 ®ion
5069 .buffer
5070 .text_summary_for_range(region.buffer_range.start.key..buffer_point),
5071 );
5072 if point == region.range.end.key && region.has_trailing_newline {
5073 position.add_assign(&D::from_text_summary(&TextSummary::newline()));
5074 }
5075 Some(position)
5076 } else {
5077 Some(D::from_text_summary(&self.text_summary()))
5078 }
5079 })
5080 }
5081
5082 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
5083 where
5084 I: 'a + IntoIterator<Item = &'a Anchor>,
5085 {
5086 let mut anchors = anchors.into_iter().enumerate().peekable();
5087 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
5088 cursor.next();
5089
5090 let mut result = Vec::new();
5091
5092 while let Some((_, anchor)) = anchors.peek() {
5093 let old_excerpt_id = anchor.excerpt_id;
5094
5095 // Find the location where this anchor's excerpt should be.
5096 let old_locator = self.excerpt_locator_for_id(old_excerpt_id);
5097 cursor.seek_forward(&Some(old_locator), Bias::Left);
5098
5099 if cursor.item().is_none() {
5100 cursor.next();
5101 }
5102
5103 let next_excerpt = cursor.item();
5104 let prev_excerpt = cursor.prev_item();
5105
5106 // Process all of the anchors for this excerpt.
5107 while let Some((_, anchor)) = anchors.peek() {
5108 if anchor.excerpt_id != old_excerpt_id {
5109 break;
5110 }
5111 let (anchor_ix, anchor) = anchors.next().unwrap();
5112 let mut anchor = *anchor;
5113
5114 // Leave min and max anchors unchanged if invalid or
5115 // if the old excerpt still exists at this location
5116 let mut kept_position = next_excerpt
5117 .is_some_and(|e| e.id == old_excerpt_id && e.contains(&anchor))
5118 || old_excerpt_id == ExcerptId::max()
5119 || old_excerpt_id == ExcerptId::min();
5120
5121 // If the old excerpt no longer exists at this location, then attempt to
5122 // find an equivalent position for this anchor in an adjacent excerpt.
5123 if !kept_position {
5124 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
5125 if excerpt.contains(&anchor) {
5126 anchor.excerpt_id = excerpt.id;
5127 kept_position = true;
5128 break;
5129 }
5130 }
5131 }
5132
5133 // If there's no adjacent excerpt that contains the anchor's position,
5134 // then report that the anchor has lost its position.
5135 if !kept_position {
5136 anchor = if let Some(excerpt) = next_excerpt {
5137 let mut text_anchor = excerpt
5138 .range
5139 .context
5140 .start
5141 .bias(anchor.text_anchor.bias, &excerpt.buffer);
5142 if text_anchor
5143 .cmp(&excerpt.range.context.end, &excerpt.buffer)
5144 .is_gt()
5145 {
5146 text_anchor = excerpt.range.context.end;
5147 }
5148 Anchor {
5149 buffer_id: Some(excerpt.buffer_id),
5150 excerpt_id: excerpt.id,
5151 text_anchor,
5152 diff_base_anchor: None,
5153 }
5154 } else if let Some(excerpt) = prev_excerpt {
5155 let mut text_anchor = excerpt
5156 .range
5157 .context
5158 .end
5159 .bias(anchor.text_anchor.bias, &excerpt.buffer);
5160 if text_anchor
5161 .cmp(&excerpt.range.context.start, &excerpt.buffer)
5162 .is_lt()
5163 {
5164 text_anchor = excerpt.range.context.start;
5165 }
5166 Anchor {
5167 buffer_id: Some(excerpt.buffer_id),
5168 excerpt_id: excerpt.id,
5169 text_anchor,
5170 diff_base_anchor: None,
5171 }
5172 } else if anchor.text_anchor.bias == Bias::Left {
5173 Anchor::min()
5174 } else {
5175 Anchor::max()
5176 };
5177 }
5178
5179 result.push((anchor_ix, anchor, kept_position));
5180 }
5181 }
5182 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self));
5183 result
5184 }
5185
5186 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
5187 self.anchor_at(position, Bias::Left)
5188 }
5189
5190 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
5191 self.anchor_at(position, Bias::Right)
5192 }
5193
5194 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
5195 let offset = position.to_offset(self);
5196
5197 // Find the given position in the diff transforms. Determine the corresponding
5198 // offset in the excerpts, and whether the position is within a deleted hunk.
5199 let mut diff_transforms = self
5200 .diff_transforms
5201 .cursor::<Dimensions<usize, ExcerptOffset>>(&());
5202 diff_transforms.seek(&offset, Bias::Right);
5203
5204 if offset == diff_transforms.start().0
5205 && bias == Bias::Left
5206 && let Some(prev_item) = diff_transforms.prev_item()
5207 && let DiffTransform::DeletedHunk { .. } = prev_item
5208 {
5209 diff_transforms.prev();
5210 }
5211 let offset_in_transform = offset - diff_transforms.start().0;
5212 let mut excerpt_offset = diff_transforms.start().1;
5213 let mut diff_base_anchor = None;
5214 if let Some(DiffTransform::DeletedHunk {
5215 buffer_id,
5216 base_text_byte_range,
5217 has_trailing_newline,
5218 ..
5219 }) = diff_transforms.item()
5220 {
5221 let diff = self.diffs.get(buffer_id).expect("missing diff");
5222 if offset_in_transform > base_text_byte_range.len() {
5223 debug_assert!(*has_trailing_newline);
5224 bias = Bias::Right;
5225 } else {
5226 diff_base_anchor = Some(
5227 diff.base_text()
5228 .anchor_at(base_text_byte_range.start + offset_in_transform, bias),
5229 );
5230 bias = Bias::Left;
5231 }
5232 } else {
5233 excerpt_offset += ExcerptOffset::new(offset_in_transform);
5234 };
5235
5236 let mut excerpts = self
5237 .excerpts
5238 .cursor::<Dimensions<ExcerptOffset, Option<ExcerptId>>>(&());
5239 excerpts.seek(&excerpt_offset, Bias::Right);
5240 if excerpts.item().is_none() && excerpt_offset == excerpts.start().0 && bias == Bias::Left {
5241 excerpts.prev();
5242 }
5243 if let Some(excerpt) = excerpts.item() {
5244 let mut overshoot = excerpt_offset.saturating_sub(excerpts.start().0).value;
5245 if excerpt.has_trailing_newline && excerpt_offset == excerpts.end().0 {
5246 overshoot -= 1;
5247 bias = Bias::Right;
5248 }
5249
5250 let buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
5251 let text_anchor =
5252 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
5253 Anchor {
5254 buffer_id: Some(excerpt.buffer_id),
5255 excerpt_id: excerpt.id,
5256 text_anchor,
5257 diff_base_anchor,
5258 }
5259 } else {
5260 let mut anchor = if excerpt_offset.is_zero() && bias == Bias::Left {
5261 Anchor::min()
5262 } else {
5263 Anchor::max()
5264 };
5265 // TODO this is a hack, remove it
5266 if let Some((excerpt_id, _, _)) = self.as_singleton() {
5267 anchor.excerpt_id = *excerpt_id;
5268 }
5269 anchor
5270 }
5271 }
5272
5273 /// Returns an anchor for the given excerpt and text anchor,
5274 /// returns None if the excerpt_id is no longer valid.
5275 pub fn anchor_in_excerpt(
5276 &self,
5277 excerpt_id: ExcerptId,
5278 text_anchor: text::Anchor,
5279 ) -> Option<Anchor> {
5280 let excerpt_id = self.latest_excerpt_id(excerpt_id);
5281 let locator = self.excerpt_locator_for_id(excerpt_id);
5282 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
5283 cursor.seek(locator, Bias::Left);
5284 if let Some(excerpt) = cursor.item()
5285 && excerpt.id == excerpt_id
5286 {
5287 let text_anchor = excerpt.clip_anchor(text_anchor);
5288 drop(cursor);
5289 return Some(Anchor {
5290 buffer_id: Some(excerpt.buffer_id),
5291 excerpt_id,
5292 text_anchor,
5293 diff_base_anchor: None,
5294 });
5295 }
5296 None
5297 }
5298
5299 pub fn context_range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<text::Anchor>> {
5300 Some(self.excerpt(excerpt_id)?.range.context.clone())
5301 }
5302
5303 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
5304 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
5305 true
5306 } else if let Some(excerpt) = self.excerpt(anchor.excerpt_id) {
5307 excerpt.buffer.can_resolve(&anchor.text_anchor)
5308 } else {
5309 false
5310 }
5311 }
5312
5313 pub fn excerpts(
5314 &self,
5315 ) -> impl Iterator<Item = (ExcerptId, &BufferSnapshot, ExcerptRange<text::Anchor>)> {
5316 self.excerpts
5317 .iter()
5318 .map(|excerpt| (excerpt.id, &excerpt.buffer, excerpt.range.clone()))
5319 }
5320
5321 fn cursor<D: TextDimension + Default>(&self) -> MultiBufferCursor<'_, D> {
5322 let excerpts = self.excerpts.cursor(&());
5323 let diff_transforms = self.diff_transforms.cursor(&());
5324 MultiBufferCursor {
5325 excerpts,
5326 diff_transforms,
5327 diffs: &self.diffs,
5328 cached_region: None,
5329 }
5330 }
5331
5332 pub fn excerpt_before(&self, id: ExcerptId) -> Option<MultiBufferExcerpt<'_>> {
5333 let start_locator = self.excerpt_locator_for_id(id);
5334 let mut excerpts = self
5335 .excerpts
5336 .cursor::<Dimensions<Option<&Locator>, ExcerptDimension<usize>>>(&());
5337 excerpts.seek(&Some(start_locator), Bias::Left);
5338 excerpts.prev();
5339
5340 let mut diff_transforms = self.diff_transforms.cursor::<DiffTransforms<usize>>(&());
5341 diff_transforms.seek(&excerpts.start().1, Bias::Left);
5342 if diff_transforms.end().excerpt_dimension < excerpts.start().1 {
5343 diff_transforms.next();
5344 }
5345
5346 let excerpt = excerpts.item()?;
5347 Some(MultiBufferExcerpt {
5348 excerpt,
5349 offset: diff_transforms.start().output_dimension.0,
5350 buffer_offset: excerpt.range.context.start.to_offset(&excerpt.buffer),
5351 excerpt_offset: excerpts.start().1.clone(),
5352 diff_transforms,
5353 })
5354 }
5355
5356 pub fn excerpt_boundaries_in_range<R, T>(
5357 &self,
5358 range: R,
5359 ) -> impl Iterator<Item = ExcerptBoundary> + '_
5360 where
5361 R: RangeBounds<T>,
5362 T: ToOffset,
5363 {
5364 let start_offset;
5365 let start = match range.start_bound() {
5366 Bound::Included(start) => {
5367 start_offset = start.to_offset(self);
5368 Bound::Included(start_offset)
5369 }
5370 Bound::Excluded(_) => {
5371 panic!("not supported")
5372 }
5373 Bound::Unbounded => {
5374 start_offset = 0;
5375 Bound::Unbounded
5376 }
5377 };
5378 let end = match range.end_bound() {
5379 Bound::Included(end) => Bound::Included(end.to_offset(self)),
5380 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
5381 Bound::Unbounded => Bound::Unbounded,
5382 };
5383 let bounds = (start, end);
5384
5385 let mut cursor = self.cursor::<DimensionPair<usize, Point>>();
5386 cursor.seek(&DimensionPair {
5387 key: start_offset,
5388 value: None,
5389 });
5390
5391 if cursor
5392 .region()
5393 .is_some_and(|region| bounds.contains(®ion.range.start.key))
5394 {
5395 cursor.prev_excerpt();
5396 } else {
5397 cursor.seek_to_start_of_current_excerpt();
5398 }
5399 let mut prev_region = cursor.region();
5400
5401 cursor.next_excerpt();
5402
5403 iter::from_fn(move || {
5404 loop {
5405 if self.singleton {
5406 return None;
5407 }
5408
5409 let next_region = cursor.region()?;
5410 cursor.next_excerpt();
5411 if !bounds.contains(&next_region.range.start.key) {
5412 prev_region = Some(next_region);
5413 continue;
5414 }
5415
5416 let next_region_start = next_region.range.start.value.unwrap();
5417 let next_region_end = if let Some(region) = cursor.region() {
5418 region.range.start.value.unwrap()
5419 } else {
5420 self.max_point()
5421 };
5422
5423 let prev = prev_region.as_ref().map(|region| ExcerptInfo {
5424 id: region.excerpt.id,
5425 buffer: region.excerpt.buffer.clone(),
5426 buffer_id: region.excerpt.buffer_id,
5427 range: region.excerpt.range.clone(),
5428 end_row: MultiBufferRow(next_region_start.row),
5429 });
5430
5431 let next = ExcerptInfo {
5432 id: next_region.excerpt.id,
5433 buffer: next_region.excerpt.buffer.clone(),
5434 buffer_id: next_region.excerpt.buffer_id,
5435 range: next_region.excerpt.range.clone(),
5436 end_row: if next_region.excerpt.has_trailing_newline {
5437 MultiBufferRow(next_region_end.row - 1)
5438 } else {
5439 MultiBufferRow(next_region_end.row)
5440 },
5441 };
5442
5443 let row = MultiBufferRow(next_region_start.row);
5444
5445 prev_region = Some(next_region);
5446
5447 return Some(ExcerptBoundary { row, prev, next });
5448 }
5449 })
5450 }
5451
5452 pub fn edit_count(&self) -> usize {
5453 self.edit_count
5454 }
5455
5456 pub fn non_text_state_update_count(&self) -> usize {
5457 self.non_text_state_update_count
5458 }
5459
5460 /// Returns the smallest enclosing bracket ranges containing the given range or
5461 /// None if no brackets contain range or the range is not contained in a single
5462 /// excerpt
5463 ///
5464 /// Can optionally pass a range_filter to filter the ranges of brackets to consider
5465 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
5466 &self,
5467 range: Range<T>,
5468 range_filter: Option<&dyn Fn(&BufferSnapshot, Range<usize>, Range<usize>) -> bool>,
5469 ) -> Option<(Range<usize>, Range<usize>)> {
5470 let range = range.start.to_offset(self)..range.end.to_offset(self);
5471 let mut excerpt = self.excerpt_containing(range.clone())?;
5472 let buffer = excerpt.buffer();
5473 let excerpt_buffer_range = excerpt.buffer_range();
5474
5475 // Filter to ranges contained in the excerpt
5476 let range_filter = |open: Range<usize>, close: Range<usize>| -> bool {
5477 excerpt_buffer_range.contains(&open.start)
5478 && excerpt_buffer_range.contains(&close.end)
5479 && range_filter.is_none_or(|filter| filter(buffer, open, close))
5480 };
5481
5482 let (open, close) = excerpt.buffer().innermost_enclosing_bracket_ranges(
5483 excerpt.map_range_to_buffer(range),
5484 Some(&range_filter),
5485 )?;
5486
5487 Some((
5488 excerpt.map_range_from_buffer(open),
5489 excerpt.map_range_from_buffer(close),
5490 ))
5491 }
5492
5493 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5494 /// not contained in a single excerpt
5495 pub fn enclosing_bracket_ranges<T: ToOffset>(
5496 &self,
5497 range: Range<T>,
5498 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + '_> {
5499 let range = range.start.to_offset(self)..range.end.to_offset(self);
5500 let mut excerpt = self.excerpt_containing(range.clone())?;
5501
5502 Some(
5503 excerpt
5504 .buffer()
5505 .enclosing_bracket_ranges(excerpt.map_range_to_buffer(range))
5506 .filter_map(move |pair| {
5507 if excerpt.contains_buffer_range(pair.open_range.start..pair.close_range.end) {
5508 Some((
5509 excerpt.map_range_from_buffer(pair.open_range),
5510 excerpt.map_range_from_buffer(pair.close_range),
5511 ))
5512 } else {
5513 None
5514 }
5515 }),
5516 )
5517 }
5518
5519 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5520 /// not contained in a single excerpt
5521 pub fn text_object_ranges<T: ToOffset>(
5522 &self,
5523 range: Range<T>,
5524 options: TreeSitterOptions,
5525 ) -> impl Iterator<Item = (Range<usize>, TextObject)> + '_ {
5526 let range = range.start.to_offset(self)..range.end.to_offset(self);
5527 self.excerpt_containing(range.clone())
5528 .map(|mut excerpt| {
5529 excerpt
5530 .buffer()
5531 .text_object_ranges(excerpt.map_range_to_buffer(range), options)
5532 .filter_map(move |(range, text_object)| {
5533 if excerpt.contains_buffer_range(range.clone()) {
5534 Some((excerpt.map_range_from_buffer(range), text_object))
5535 } else {
5536 None
5537 }
5538 })
5539 })
5540 .into_iter()
5541 .flatten()
5542 }
5543
5544 /// Returns bracket range pairs overlapping the given `range` or returns None if the `range` is
5545 /// not contained in a single excerpt
5546 pub fn bracket_ranges<T: ToOffset>(
5547 &self,
5548 range: Range<T>,
5549 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + '_> {
5550 let range = range.start.to_offset(self)..range.end.to_offset(self);
5551 let mut excerpt = self.excerpt_containing(range.clone())?;
5552
5553 Some(
5554 excerpt
5555 .buffer()
5556 .bracket_ranges(excerpt.map_range_to_buffer(range))
5557 .filter_map(move |pair| {
5558 let buffer_range = pair.open_range.start..pair.close_range.end;
5559 if excerpt.contains_buffer_range(buffer_range) {
5560 Some((
5561 excerpt.map_range_from_buffer(pair.open_range),
5562 excerpt.map_range_from_buffer(pair.close_range),
5563 ))
5564 } else {
5565 None
5566 }
5567 }),
5568 )
5569 }
5570
5571 pub fn redacted_ranges<'a, T: ToOffset>(
5572 &'a self,
5573 range: Range<T>,
5574 redaction_enabled: impl Fn(Option<&Arc<dyn File>>) -> bool + 'a,
5575 ) -> impl Iterator<Item = Range<usize>> + 'a {
5576 let range = range.start.to_offset(self)..range.end.to_offset(self);
5577 self.lift_buffer_metadata(range, move |buffer, range| {
5578 if redaction_enabled(buffer.file()) {
5579 Some(buffer.redacted_ranges(range).map(|range| (range, ())))
5580 } else {
5581 None
5582 }
5583 })
5584 .map(|(range, _, _)| range)
5585 }
5586
5587 pub fn runnable_ranges(
5588 &self,
5589 range: Range<Anchor>,
5590 ) -> impl Iterator<Item = language::RunnableRange> + '_ {
5591 let range = range.start.to_offset(self)..range.end.to_offset(self);
5592 self.lift_buffer_metadata(range, move |buffer, range| {
5593 Some(
5594 buffer
5595 .runnable_ranges(range.clone())
5596 .filter(move |runnable| {
5597 runnable.run_range.start >= range.start
5598 && runnable.run_range.end < range.end
5599 })
5600 .map(|runnable| (runnable.run_range.clone(), runnable)),
5601 )
5602 })
5603 .map(|(run_range, runnable, _)| language::RunnableRange {
5604 run_range,
5605 ..runnable
5606 })
5607 }
5608
5609 pub fn line_indents(
5610 &self,
5611 start_row: MultiBufferRow,
5612 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5613 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5614 let max_point = self.max_point();
5615 let mut cursor = self.cursor::<Point>();
5616 cursor.seek(&Point::new(start_row.0, 0));
5617 iter::from_fn(move || {
5618 let mut region = cursor.region()?;
5619 while !buffer_filter(®ion.excerpt.buffer) {
5620 cursor.next();
5621 region = cursor.region()?;
5622 }
5623 let overshoot = start_row.0.saturating_sub(region.range.start.row);
5624 let buffer_start_row =
5625 (region.buffer_range.start.row + overshoot).min(region.buffer_range.end.row);
5626
5627 let buffer_end_row = if region.is_main_buffer
5628 && (region.has_trailing_newline || region.range.end == max_point)
5629 {
5630 region.buffer_range.end.row
5631 } else {
5632 region.buffer_range.end.row.saturating_sub(1)
5633 };
5634
5635 let line_indents = region
5636 .buffer
5637 .line_indents_in_row_range(buffer_start_row..buffer_end_row);
5638 cursor.next();
5639 Some(line_indents.map(move |(buffer_row, indent)| {
5640 let row = region.range.start.row + (buffer_row - region.buffer_range.start.row);
5641 (MultiBufferRow(row), indent, ®ion.excerpt.buffer)
5642 }))
5643 })
5644 .flatten()
5645 }
5646
5647 pub fn reversed_line_indents(
5648 &self,
5649 end_row: MultiBufferRow,
5650 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5651 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5652 let max_point = self.max_point();
5653 let mut cursor = self.cursor::<Point>();
5654 cursor.seek(&Point::new(end_row.0, 0));
5655 iter::from_fn(move || {
5656 let mut region = cursor.region()?;
5657 while !buffer_filter(®ion.excerpt.buffer) {
5658 cursor.prev();
5659 region = cursor.region()?;
5660 }
5661
5662 let buffer_start_row = region.buffer_range.start.row;
5663 let buffer_end_row = if region.is_main_buffer
5664 && (region.has_trailing_newline || region.range.end == max_point)
5665 {
5666 region.buffer_range.end.row + 1
5667 } else {
5668 region.buffer_range.end.row
5669 };
5670
5671 let overshoot = end_row.0 - region.range.start.row;
5672 let buffer_end_row =
5673 (region.buffer_range.start.row + overshoot + 1).min(buffer_end_row);
5674
5675 let line_indents = region
5676 .buffer
5677 .reversed_line_indents_in_row_range(buffer_start_row..buffer_end_row);
5678 cursor.prev();
5679 Some(line_indents.map(move |(buffer_row, indent)| {
5680 let row = region.range.start.row + (buffer_row - region.buffer_range.start.row);
5681 (MultiBufferRow(row), indent, ®ion.excerpt.buffer)
5682 }))
5683 })
5684 .flatten()
5685 }
5686
5687 pub async fn enclosing_indent(
5688 &self,
5689 mut target_row: MultiBufferRow,
5690 ) -> Option<(Range<MultiBufferRow>, LineIndent)> {
5691 let max_row = MultiBufferRow(self.max_point().row);
5692 if target_row >= max_row {
5693 return None;
5694 }
5695
5696 let mut target_indent = self.line_indent_for_row(target_row);
5697
5698 // If the current row is at the start of an indented block, we want to return this
5699 // block as the enclosing indent.
5700 if !target_indent.is_line_empty() && target_row < max_row {
5701 let next_line_indent = self.line_indent_for_row(MultiBufferRow(target_row.0 + 1));
5702 if !next_line_indent.is_line_empty()
5703 && target_indent.raw_len() < next_line_indent.raw_len()
5704 {
5705 target_indent = next_line_indent;
5706 target_row.0 += 1;
5707 }
5708 }
5709
5710 const SEARCH_ROW_LIMIT: u32 = 25000;
5711 const SEARCH_WHITESPACE_ROW_LIMIT: u32 = 2500;
5712 const YIELD_INTERVAL: u32 = 100;
5713
5714 let mut accessed_row_counter = 0;
5715
5716 // If there is a blank line at the current row, search for the next non indented lines
5717 if target_indent.is_line_empty() {
5718 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_WHITESPACE_ROW_LIMIT));
5719 let end =
5720 MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_WHITESPACE_ROW_LIMIT));
5721
5722 let mut non_empty_line_above = None;
5723 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5724 if row < start {
5725 break;
5726 }
5727 accessed_row_counter += 1;
5728 if accessed_row_counter == YIELD_INTERVAL {
5729 accessed_row_counter = 0;
5730 yield_now().await;
5731 }
5732 if !indent.is_line_empty() {
5733 non_empty_line_above = Some((row, indent));
5734 break;
5735 }
5736 }
5737
5738 let mut non_empty_line_below = None;
5739 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5740 if row > end {
5741 break;
5742 }
5743 accessed_row_counter += 1;
5744 if accessed_row_counter == YIELD_INTERVAL {
5745 accessed_row_counter = 0;
5746 yield_now().await;
5747 }
5748 if !indent.is_line_empty() {
5749 non_empty_line_below = Some((row, indent));
5750 break;
5751 }
5752 }
5753
5754 let (row, indent) = match (non_empty_line_above, non_empty_line_below) {
5755 (Some((above_row, above_indent)), Some((below_row, below_indent))) => {
5756 if above_indent.raw_len() >= below_indent.raw_len() {
5757 (above_row, above_indent)
5758 } else {
5759 (below_row, below_indent)
5760 }
5761 }
5762 (Some(above), None) => above,
5763 (None, Some(below)) => below,
5764 _ => return None,
5765 };
5766
5767 target_indent = indent;
5768 target_row = row;
5769 }
5770
5771 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_ROW_LIMIT));
5772 let end = MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_ROW_LIMIT));
5773
5774 let mut start_indent = None;
5775 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5776 if row < start {
5777 break;
5778 }
5779 accessed_row_counter += 1;
5780 if accessed_row_counter == YIELD_INTERVAL {
5781 accessed_row_counter = 0;
5782 yield_now().await;
5783 }
5784 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5785 start_indent = Some((row, indent));
5786 break;
5787 }
5788 }
5789 let (start_row, start_indent_size) = start_indent?;
5790
5791 let mut end_indent = (end, None);
5792 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5793 if row > end {
5794 break;
5795 }
5796 accessed_row_counter += 1;
5797 if accessed_row_counter == YIELD_INTERVAL {
5798 accessed_row_counter = 0;
5799 yield_now().await;
5800 }
5801 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5802 end_indent = (MultiBufferRow(row.0.saturating_sub(1)), Some(indent));
5803 break;
5804 }
5805 }
5806 let (end_row, end_indent_size) = end_indent;
5807
5808 let indent = if let Some(end_indent_size) = end_indent_size {
5809 if start_indent_size.raw_len() > end_indent_size.raw_len() {
5810 start_indent_size
5811 } else {
5812 end_indent_size
5813 }
5814 } else {
5815 start_indent_size
5816 };
5817
5818 Some((start_row..end_row, indent))
5819 }
5820
5821 pub fn indent_guides_in_range<T: ToPoint>(
5822 &self,
5823 range: Range<T>,
5824 ignore_disabled_for_language: bool,
5825 cx: &App,
5826 ) -> impl Iterator<Item = IndentGuide> {
5827 let range = range.start.to_point(self)..range.end.to_point(self);
5828 let start_row = MultiBufferRow(range.start.row);
5829 let end_row = MultiBufferRow(range.end.row);
5830
5831 let mut row_indents = self.line_indents(start_row, |buffer| {
5832 let settings =
5833 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx);
5834 settings.indent_guides.enabled || ignore_disabled_for_language
5835 });
5836
5837 let mut result = Vec::new();
5838 let mut indent_stack = SmallVec::<[IndentGuide; 8]>::new();
5839
5840 let mut prev_settings = None;
5841 while let Some((first_row, mut line_indent, buffer)) = row_indents.next() {
5842 if first_row > end_row {
5843 break;
5844 }
5845 let current_depth = indent_stack.len() as u32;
5846
5847 // Avoid retrieving the language settings repeatedly for every buffer row.
5848 if let Some((prev_buffer_id, _)) = &prev_settings
5849 && prev_buffer_id != &buffer.remote_id()
5850 {
5851 prev_settings.take();
5852 }
5853 let settings = &prev_settings
5854 .get_or_insert_with(|| {
5855 (
5856 buffer.remote_id(),
5857 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx),
5858 )
5859 })
5860 .1;
5861 let tab_size = settings.tab_size.get();
5862
5863 // When encountering empty, continue until found useful line indent
5864 // then add to the indent stack with the depth found
5865 let mut found_indent = false;
5866 let mut last_row = first_row;
5867 if line_indent.is_line_blank() {
5868 while !found_indent {
5869 let Some((target_row, new_line_indent, _)) = row_indents.next() else {
5870 break;
5871 };
5872 const TRAILING_ROW_SEARCH_LIMIT: u32 = 25;
5873 if target_row > MultiBufferRow(end_row.0 + TRAILING_ROW_SEARCH_LIMIT) {
5874 break;
5875 }
5876
5877 if new_line_indent.is_line_blank() {
5878 continue;
5879 }
5880 last_row = target_row.min(end_row);
5881 line_indent = new_line_indent;
5882 found_indent = true;
5883 break;
5884 }
5885 } else {
5886 found_indent = true
5887 }
5888
5889 let depth = if found_indent {
5890 line_indent.len(tab_size) / tab_size
5891 } else {
5892 0
5893 };
5894
5895 match depth.cmp(¤t_depth) {
5896 cmp::Ordering::Less => {
5897 for _ in 0..(current_depth - depth) {
5898 let mut indent = indent_stack.pop().unwrap();
5899 if last_row != first_row {
5900 // In this case, we landed on an empty row, had to seek forward,
5901 // and discovered that the indent we where on is ending.
5902 // This means that the last display row must
5903 // be on line that ends this indent range, so we
5904 // should display the range up to the first non-empty line
5905 indent.end_row = MultiBufferRow(first_row.0.saturating_sub(1));
5906 }
5907
5908 result.push(indent)
5909 }
5910 }
5911 cmp::Ordering::Greater => {
5912 for next_depth in current_depth..depth {
5913 indent_stack.push(IndentGuide {
5914 buffer_id: buffer.remote_id(),
5915 start_row: first_row,
5916 end_row: last_row,
5917 depth: next_depth,
5918 tab_size,
5919 settings: settings.indent_guides,
5920 });
5921 }
5922 }
5923 _ => {}
5924 }
5925
5926 for indent in indent_stack.iter_mut() {
5927 indent.end_row = last_row;
5928 }
5929 }
5930
5931 result.extend(indent_stack);
5932 result.into_iter()
5933 }
5934
5935 pub fn trailing_excerpt_update_count(&self) -> usize {
5936 self.trailing_excerpt_update_count
5937 }
5938
5939 pub fn file_at<T: ToOffset>(&self, point: T) -> Option<&Arc<dyn File>> {
5940 self.point_to_buffer_offset(point)
5941 .and_then(|(buffer, _)| buffer.file())
5942 }
5943
5944 pub fn language_at<T: ToOffset>(&self, point: T) -> Option<&Arc<Language>> {
5945 self.point_to_buffer_offset(point)
5946 .and_then(|(buffer, offset)| buffer.language_at(offset))
5947 }
5948
5949 fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
5950 self.excerpts
5951 .first()
5952 .map(|excerpt| &excerpt.buffer)
5953 .map(|buffer| {
5954 language_settings(
5955 buffer.language().map(|language| language.name()),
5956 buffer.file(),
5957 cx,
5958 )
5959 })
5960 .unwrap_or_else(move || self.language_settings_at(0, cx))
5961 }
5962
5963 pub fn language_settings_at<'a, T: ToOffset>(
5964 &'a self,
5965 point: T,
5966 cx: &'a App,
5967 ) -> Cow<'a, LanguageSettings> {
5968 let mut language = None;
5969 let mut file = None;
5970 if let Some((buffer, offset)) = self.point_to_buffer_offset(point) {
5971 language = buffer.language_at(offset);
5972 file = buffer.file();
5973 }
5974 language_settings(language.map(|l| l.name()), file, cx)
5975 }
5976
5977 pub fn language_scope_at<T: ToOffset>(&self, point: T) -> Option<LanguageScope> {
5978 self.point_to_buffer_offset(point)
5979 .and_then(|(buffer, offset)| buffer.language_scope_at(offset))
5980 }
5981
5982 pub fn char_classifier_at<T: ToOffset>(&self, point: T) -> CharClassifier {
5983 self.point_to_buffer_offset(point)
5984 .map(|(buffer, offset)| buffer.char_classifier_at(offset))
5985 .unwrap_or_default()
5986 }
5987
5988 pub fn language_indent_size_at<T: ToOffset>(
5989 &self,
5990 position: T,
5991 cx: &App,
5992 ) -> Option<IndentSize> {
5993 let (buffer_snapshot, offset) = self.point_to_buffer_offset(position)?;
5994 Some(buffer_snapshot.language_indent_size_at(offset, cx))
5995 }
5996
5997 pub fn is_dirty(&self) -> bool {
5998 self.is_dirty
5999 }
6000
6001 pub fn has_deleted_file(&self) -> bool {
6002 self.has_deleted_file
6003 }
6004
6005 pub fn has_conflict(&self) -> bool {
6006 self.has_conflict
6007 }
6008
6009 pub fn has_diagnostics(&self) -> bool {
6010 self.excerpts
6011 .iter()
6012 .any(|excerpt| excerpt.buffer.has_diagnostics())
6013 }
6014
6015 pub fn diagnostic_group(
6016 &self,
6017 buffer_id: BufferId,
6018 group_id: usize,
6019 ) -> impl Iterator<Item = DiagnosticEntry<Point>> + '_ {
6020 self.lift_buffer_metadata(Point::zero()..self.max_point(), move |buffer, range| {
6021 if buffer.remote_id() != buffer_id {
6022 return None;
6023 };
6024 Some(
6025 buffer
6026 .diagnostics_in_range(range, false)
6027 .filter(move |diagnostic| diagnostic.diagnostic.group_id == group_id)
6028 .map(move |DiagnosticEntry { diagnostic, range }| (range, diagnostic)),
6029 )
6030 })
6031 .map(|(range, diagnostic, _)| DiagnosticEntry { diagnostic, range })
6032 }
6033
6034 pub fn diagnostics_in_range<'a, T>(
6035 &'a self,
6036 range: Range<T>,
6037 ) -> impl Iterator<Item = DiagnosticEntry<T>> + 'a
6038 where
6039 T: 'a
6040 + text::ToOffset
6041 + text::FromAnchor
6042 + TextDimension
6043 + Ord
6044 + Sub<T, Output = T>
6045 + fmt::Debug,
6046 {
6047 self.lift_buffer_metadata(range, move |buffer, buffer_range| {
6048 Some(
6049 buffer
6050 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
6051 .map(|entry| (entry.range, entry.diagnostic)),
6052 )
6053 })
6054 .map(|(range, diagnostic, _)| DiagnosticEntry { diagnostic, range })
6055 }
6056
6057 pub fn diagnostics_with_buffer_ids_in_range<'a, T>(
6058 &'a self,
6059 range: Range<T>,
6060 ) -> impl Iterator<Item = (BufferId, DiagnosticEntry<T>)> + 'a
6061 where
6062 T: 'a
6063 + text::ToOffset
6064 + text::FromAnchor
6065 + TextDimension
6066 + Ord
6067 + Sub<T, Output = T>
6068 + fmt::Debug,
6069 {
6070 self.lift_buffer_metadata(range, move |buffer, buffer_range| {
6071 Some(
6072 buffer
6073 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
6074 .map(|entry| (entry.range, entry.diagnostic)),
6075 )
6076 })
6077 .map(|(range, diagnostic, b)| (b.buffer_id, DiagnosticEntry { diagnostic, range }))
6078 }
6079
6080 pub fn syntax_ancestor<T: ToOffset>(
6081 &self,
6082 range: Range<T>,
6083 ) -> Option<(tree_sitter::Node<'_>, MultiOrSingleBufferOffsetRange)> {
6084 let range = range.start.to_offset(self)..range.end.to_offset(self);
6085 let mut excerpt = self.excerpt_containing(range.clone())?;
6086 let node = excerpt
6087 .buffer()
6088 .syntax_ancestor(excerpt.map_range_to_buffer(range))?;
6089 let node_range = node.byte_range();
6090 let range = if excerpt.contains_buffer_range(node_range.clone()) {
6091 MultiOrSingleBufferOffsetRange::Multi(excerpt.map_range_from_buffer(node_range))
6092 } else {
6093 MultiOrSingleBufferOffsetRange::Single(node_range)
6094 };
6095 Some((node, range))
6096 }
6097
6098 pub fn syntax_next_sibling<T: ToOffset>(
6099 &self,
6100 range: Range<T>,
6101 ) -> Option<tree_sitter::Node<'_>> {
6102 let range = range.start.to_offset(self)..range.end.to_offset(self);
6103 let mut excerpt = self.excerpt_containing(range.clone())?;
6104 excerpt
6105 .buffer()
6106 .syntax_next_sibling(excerpt.map_range_to_buffer(range))
6107 }
6108
6109 pub fn syntax_prev_sibling<T: ToOffset>(
6110 &self,
6111 range: Range<T>,
6112 ) -> Option<tree_sitter::Node<'_>> {
6113 let range = range.start.to_offset(self)..range.end.to_offset(self);
6114 let mut excerpt = self.excerpt_containing(range.clone())?;
6115 excerpt
6116 .buffer()
6117 .syntax_prev_sibling(excerpt.map_range_to_buffer(range))
6118 }
6119
6120 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
6121 let (excerpt_id, _, buffer) = self.as_singleton()?;
6122 let outline = buffer.outline(theme);
6123 Some(Outline::new(
6124 outline
6125 .items
6126 .into_iter()
6127 .flat_map(|item| {
6128 Some(OutlineItem {
6129 depth: item.depth,
6130 range: self.anchor_in_excerpt(*excerpt_id, item.range.start)?
6131 ..self.anchor_in_excerpt(*excerpt_id, item.range.end)?,
6132 text: item.text,
6133 highlight_ranges: item.highlight_ranges,
6134 name_ranges: item.name_ranges,
6135 body_range: item.body_range.and_then(|body_range| {
6136 Some(
6137 self.anchor_in_excerpt(*excerpt_id, body_range.start)?
6138 ..self.anchor_in_excerpt(*excerpt_id, body_range.end)?,
6139 )
6140 }),
6141 annotation_range: item.annotation_range.and_then(|annotation_range| {
6142 Some(
6143 self.anchor_in_excerpt(*excerpt_id, annotation_range.start)?
6144 ..self.anchor_in_excerpt(*excerpt_id, annotation_range.end)?,
6145 )
6146 }),
6147 })
6148 })
6149 .collect(),
6150 ))
6151 }
6152
6153 pub fn symbols_containing<T: ToOffset>(
6154 &self,
6155 offset: T,
6156 theme: Option<&SyntaxTheme>,
6157 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
6158 let anchor = self.anchor_before(offset);
6159 let excerpt_id = anchor.excerpt_id;
6160 let excerpt = self.excerpt(excerpt_id)?;
6161 Some((
6162 excerpt.buffer_id,
6163 excerpt
6164 .buffer
6165 .symbols_containing(anchor.text_anchor, theme)
6166 .into_iter()
6167 .flat_map(|item| {
6168 Some(OutlineItem {
6169 depth: item.depth,
6170 range: self.anchor_in_excerpt(excerpt_id, item.range.start)?
6171 ..self.anchor_in_excerpt(excerpt_id, item.range.end)?,
6172 text: item.text,
6173 highlight_ranges: item.highlight_ranges,
6174 name_ranges: item.name_ranges,
6175 body_range: item.body_range.and_then(|body_range| {
6176 Some(
6177 self.anchor_in_excerpt(excerpt_id, body_range.start)?
6178 ..self.anchor_in_excerpt(excerpt_id, body_range.end)?,
6179 )
6180 }),
6181 annotation_range: item.annotation_range.and_then(|body_range| {
6182 Some(
6183 self.anchor_in_excerpt(excerpt_id, body_range.start)?
6184 ..self.anchor_in_excerpt(excerpt_id, body_range.end)?,
6185 )
6186 }),
6187 })
6188 })
6189 .collect(),
6190 ))
6191 }
6192
6193 fn excerpt_locator_for_id(&self, id: ExcerptId) -> &Locator {
6194 if id == ExcerptId::min() {
6195 Locator::min_ref()
6196 } else if id == ExcerptId::max() {
6197 Locator::max_ref()
6198 } else {
6199 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>(&());
6200 cursor.seek(&id, Bias::Left);
6201 if let Some(entry) = cursor.item()
6202 && entry.id == id
6203 {
6204 return &entry.locator;
6205 }
6206 panic!("invalid excerpt id {id:?}")
6207 }
6208 }
6209
6210 /// Returns the locators referenced by the given excerpt IDs, sorted by locator.
6211 fn excerpt_locators_for_ids(
6212 &self,
6213 ids: impl IntoIterator<Item = ExcerptId>,
6214 ) -> SmallVec<[Locator; 1]> {
6215 let mut sorted_ids = ids.into_iter().collect::<SmallVec<[_; 1]>>();
6216 sorted_ids.sort_unstable();
6217 let mut locators = SmallVec::new();
6218
6219 while sorted_ids.last() == Some(&ExcerptId::max()) {
6220 sorted_ids.pop();
6221 if let Some(mapping) = self.excerpt_ids.last() {
6222 locators.push(mapping.locator.clone());
6223 }
6224 }
6225
6226 let mut sorted_ids = sorted_ids.into_iter().dedup().peekable();
6227 if sorted_ids.peek() == Some(&ExcerptId::min()) {
6228 sorted_ids.next();
6229 if let Some(mapping) = self.excerpt_ids.first() {
6230 locators.push(mapping.locator.clone());
6231 }
6232 }
6233
6234 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>(&());
6235 for id in sorted_ids {
6236 if cursor.seek_forward(&id, Bias::Left) {
6237 locators.push(cursor.item().unwrap().locator.clone());
6238 } else {
6239 panic!("invalid excerpt id {:?}", id);
6240 }
6241 }
6242
6243 locators.sort_unstable();
6244 locators
6245 }
6246
6247 pub fn buffer_id_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<BufferId> {
6248 Some(self.excerpt(excerpt_id)?.buffer_id)
6249 }
6250
6251 pub fn buffer_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<&BufferSnapshot> {
6252 Some(&self.excerpt(excerpt_id)?.buffer)
6253 }
6254
6255 pub fn range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<Point>> {
6256 let mut cursor = self
6257 .excerpts
6258 .cursor::<Dimensions<Option<&Locator>, ExcerptDimension<Point>>>(&());
6259 let locator = self.excerpt_locator_for_id(excerpt_id);
6260 if cursor.seek(&Some(locator), Bias::Left) {
6261 let start = cursor.start().1.clone();
6262 let end = cursor.end().1;
6263 let mut diff_transforms = self
6264 .diff_transforms
6265 .cursor::<Dimensions<ExcerptDimension<Point>, OutputDimension<Point>>>(&());
6266 diff_transforms.seek(&start, Bias::Left);
6267 let overshoot = start.0 - diff_transforms.start().0.0;
6268 let start = diff_transforms.start().1.0 + overshoot;
6269 diff_transforms.seek(&end, Bias::Right);
6270 let overshoot = end.0 - diff_transforms.start().0.0;
6271 let end = diff_transforms.start().1.0 + overshoot;
6272 Some(start..end)
6273 } else {
6274 None
6275 }
6276 }
6277
6278 pub fn buffer_range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<text::Anchor>> {
6279 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
6280 let locator = self.excerpt_locator_for_id(excerpt_id);
6281 if cursor.seek(&Some(locator), Bias::Left)
6282 && let Some(excerpt) = cursor.item()
6283 {
6284 return Some(excerpt.range.context.clone());
6285 }
6286 None
6287 }
6288
6289 fn excerpt(&self, excerpt_id: ExcerptId) -> Option<&Excerpt> {
6290 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
6291 let locator = self.excerpt_locator_for_id(excerpt_id);
6292 cursor.seek(&Some(locator), Bias::Left);
6293 if let Some(excerpt) = cursor.item()
6294 && excerpt.id == excerpt_id
6295 {
6296 return Some(excerpt);
6297 }
6298 None
6299 }
6300
6301 /// Returns the excerpt containing range and its offset start within the multibuffer or none if `range` spans multiple excerpts
6302 pub fn excerpt_containing<T: ToOffset>(
6303 &self,
6304 range: Range<T>,
6305 ) -> Option<MultiBufferExcerpt<'_>> {
6306 let range = range.start.to_offset(self)..range.end.to_offset(self);
6307 let mut cursor = self.cursor::<usize>();
6308 cursor.seek(&range.start);
6309
6310 let start_excerpt = cursor.excerpt()?;
6311 if range.end != range.start {
6312 cursor.seek_forward(&range.end);
6313 if cursor.excerpt()?.id != start_excerpt.id {
6314 return None;
6315 }
6316 }
6317
6318 cursor.seek_to_start_of_current_excerpt();
6319 let region = cursor.region()?;
6320 let offset = region.range.start;
6321 let buffer_offset = start_excerpt.buffer_start_offset();
6322 let excerpt_offset = cursor.excerpts.start().clone();
6323 Some(MultiBufferExcerpt {
6324 diff_transforms: cursor.diff_transforms,
6325 excerpt: start_excerpt,
6326 offset,
6327 buffer_offset,
6328 excerpt_offset,
6329 })
6330 }
6331
6332 pub fn buffer_id_for_anchor(&self, anchor: Anchor) -> Option<BufferId> {
6333 if let Some(id) = anchor.buffer_id {
6334 return Some(id);
6335 }
6336 let excerpt = self.excerpt_containing(anchor..anchor)?;
6337 Some(excerpt.buffer_id())
6338 }
6339
6340 pub fn selections_in_range<'a>(
6341 &'a self,
6342 range: &'a Range<Anchor>,
6343 include_local: bool,
6344 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
6345 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(&());
6346 let start_locator = self.excerpt_locator_for_id(range.start.excerpt_id);
6347 let end_locator = self.excerpt_locator_for_id(range.end.excerpt_id);
6348 cursor.seek(start_locator, Bias::Left);
6349 cursor
6350 .take_while(move |excerpt| excerpt.locator <= *end_locator)
6351 .flat_map(move |excerpt| {
6352 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
6353 if excerpt.id == range.start.excerpt_id {
6354 query_range.start = range.start.text_anchor;
6355 }
6356 if excerpt.id == range.end.excerpt_id {
6357 query_range.end = range.end.text_anchor;
6358 }
6359
6360 excerpt
6361 .buffer
6362 .selections_in_range(query_range, include_local)
6363 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
6364 selections.map(move |selection| {
6365 let mut start = Anchor {
6366 buffer_id: Some(excerpt.buffer_id),
6367 excerpt_id: excerpt.id,
6368 text_anchor: selection.start,
6369 diff_base_anchor: None,
6370 };
6371 let mut end = Anchor {
6372 buffer_id: Some(excerpt.buffer_id),
6373 excerpt_id: excerpt.id,
6374 text_anchor: selection.end,
6375 diff_base_anchor: None,
6376 };
6377 if range.start.cmp(&start, self).is_gt() {
6378 start = range.start;
6379 }
6380 if range.end.cmp(&end, self).is_lt() {
6381 end = range.end;
6382 }
6383
6384 (
6385 replica_id,
6386 line_mode,
6387 cursor_shape,
6388 Selection {
6389 id: selection.id,
6390 start,
6391 end,
6392 reversed: selection.reversed,
6393 goal: selection.goal,
6394 },
6395 )
6396 })
6397 })
6398 })
6399 }
6400
6401 pub fn show_headers(&self) -> bool {
6402 self.show_headers
6403 }
6404
6405 pub fn diff_for_buffer_id(&self, buffer_id: BufferId) -> Option<&BufferDiffSnapshot> {
6406 self.diffs.get(&buffer_id)
6407 }
6408}
6409
6410#[cfg(any(test, feature = "test-support"))]
6411impl MultiBufferSnapshot {
6412 pub fn random_byte_range(&self, start_offset: usize, rng: &mut impl rand::Rng) -> Range<usize> {
6413 let end = self.clip_offset(rng.random_range(start_offset..=self.len()), Bias::Right);
6414 let start = self.clip_offset(rng.random_range(start_offset..=end), Bias::Right);
6415 start..end
6416 }
6417
6418 #[cfg(any(test, feature = "test-support"))]
6419 fn check_invariants(&self) {
6420 let excerpts = self.excerpts.items(&());
6421 let excerpt_ids = self.excerpt_ids.items(&());
6422
6423 for (ix, excerpt) in excerpts.iter().enumerate() {
6424 if ix == 0 {
6425 if excerpt.locator <= Locator::min() {
6426 panic!("invalid first excerpt locator {:?}", excerpt.locator);
6427 }
6428 } else if excerpt.locator <= excerpts[ix - 1].locator {
6429 panic!("excerpts are out-of-order: {:?}", excerpts);
6430 }
6431 }
6432
6433 for (ix, entry) in excerpt_ids.iter().enumerate() {
6434 if ix == 0 {
6435 if entry.id.cmp(&ExcerptId::min(), self).is_le() {
6436 panic!("invalid first excerpt id {:?}", entry.id);
6437 }
6438 } else if entry.id <= excerpt_ids[ix - 1].id {
6439 panic!("excerpt ids are out-of-order: {:?}", excerpt_ids);
6440 }
6441 }
6442
6443 if self.diff_transforms.summary().input != self.excerpts.summary().text {
6444 panic!(
6445 "incorrect input summary. expected {:?}, got {:?}. transforms: {:+?}",
6446 self.excerpts.summary().text.len,
6447 self.diff_transforms.summary().input,
6448 self.diff_transforms.items(&()),
6449 );
6450 }
6451
6452 let mut prev_transform: Option<&DiffTransform> = None;
6453 for item in self.diff_transforms.iter() {
6454 if let DiffTransform::BufferContent {
6455 summary,
6456 inserted_hunk_info,
6457 } = item
6458 {
6459 if let Some(DiffTransform::BufferContent {
6460 inserted_hunk_info: prev_inserted_hunk_info,
6461 ..
6462 }) = prev_transform
6463 && *inserted_hunk_info == *prev_inserted_hunk_info
6464 {
6465 panic!(
6466 "multiple adjacent buffer content transforms with is_inserted_hunk = {inserted_hunk_info:?}. transforms: {:+?}",
6467 self.diff_transforms.items(&())
6468 );
6469 }
6470 if summary.len == 0 && !self.is_empty() {
6471 panic!("empty buffer content transform");
6472 }
6473 }
6474 prev_transform = Some(item);
6475 }
6476 }
6477}
6478
6479impl<'a, D> MultiBufferCursor<'a, D>
6480where
6481 D: TextDimension + Ord + Sub<D, Output = D>,
6482{
6483 fn seek(&mut self, position: &D) {
6484 self.cached_region.take();
6485 self.diff_transforms
6486 .seek(&OutputDimension(*position), Bias::Right);
6487 if self.diff_transforms.item().is_none()
6488 && *position == self.diff_transforms.start().output_dimension.0
6489 {
6490 self.diff_transforms.prev();
6491 }
6492
6493 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension.0;
6494 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6495 let overshoot = *position - self.diff_transforms.start().output_dimension.0;
6496 excerpt_position.add_assign(&overshoot);
6497 }
6498
6499 self.excerpts
6500 .seek(&ExcerptDimension(excerpt_position), Bias::Right);
6501 if self.excerpts.item().is_none() && excerpt_position == self.excerpts.start().0 {
6502 self.excerpts.prev();
6503 }
6504 }
6505
6506 fn seek_forward(&mut self, position: &D) {
6507 self.cached_region.take();
6508 self.diff_transforms
6509 .seek_forward(&OutputDimension(*position), Bias::Right);
6510 if self.diff_transforms.item().is_none()
6511 && *position == self.diff_transforms.start().output_dimension.0
6512 {
6513 self.diff_transforms.prev();
6514 }
6515
6516 let overshoot = *position - self.diff_transforms.start().output_dimension.0;
6517 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension.0;
6518 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6519 excerpt_position.add_assign(&overshoot);
6520 }
6521
6522 self.excerpts
6523 .seek_forward(&ExcerptDimension(excerpt_position), Bias::Right);
6524 if self.excerpts.item().is_none() && excerpt_position == self.excerpts.start().0 {
6525 self.excerpts.prev();
6526 }
6527 }
6528
6529 fn next_excerpt(&mut self) {
6530 self.excerpts.next();
6531 self.seek_to_start_of_current_excerpt();
6532 }
6533
6534 fn prev_excerpt(&mut self) {
6535 self.excerpts.prev();
6536 self.seek_to_start_of_current_excerpt();
6537 }
6538
6539 fn seek_to_start_of_current_excerpt(&mut self) {
6540 self.cached_region.take();
6541 self.diff_transforms.seek(self.excerpts.start(), Bias::Left);
6542 if self.diff_transforms.end().excerpt_dimension == *self.excerpts.start()
6543 && self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6544 && self.diff_transforms.next_item().is_some()
6545 {
6546 self.diff_transforms.next();
6547 }
6548 }
6549
6550 fn next(&mut self) {
6551 self.cached_region.take();
6552 match self
6553 .diff_transforms
6554 .end()
6555 .excerpt_dimension
6556 .cmp(&self.excerpts.end())
6557 {
6558 cmp::Ordering::Less => self.diff_transforms.next(),
6559 cmp::Ordering::Greater => self.excerpts.next(),
6560 cmp::Ordering::Equal => {
6561 self.diff_transforms.next();
6562 if self.diff_transforms.end().excerpt_dimension > self.excerpts.end()
6563 || self.diff_transforms.item().is_none()
6564 {
6565 self.excerpts.next();
6566 } else if let Some(DiffTransform::DeletedHunk { hunk_info, .. }) =
6567 self.diff_transforms.item()
6568 && self
6569 .excerpts
6570 .item()
6571 .is_some_and(|excerpt| excerpt.id != hunk_info.excerpt_id)
6572 {
6573 self.excerpts.next();
6574 }
6575 }
6576 }
6577 }
6578
6579 fn prev(&mut self) {
6580 self.cached_region.take();
6581 match self
6582 .diff_transforms
6583 .start()
6584 .excerpt_dimension
6585 .cmp(self.excerpts.start())
6586 {
6587 cmp::Ordering::Less => self.excerpts.prev(),
6588 cmp::Ordering::Greater => self.diff_transforms.prev(),
6589 cmp::Ordering::Equal => {
6590 self.diff_transforms.prev();
6591 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6592 || self.diff_transforms.item().is_none()
6593 {
6594 self.excerpts.prev();
6595 }
6596 }
6597 }
6598 }
6599
6600 fn region(&mut self) -> Option<MultiBufferRegion<'a, D>> {
6601 if self.cached_region.is_none() {
6602 self.cached_region = self.build_region();
6603 }
6604 self.cached_region.clone()
6605 }
6606
6607 fn is_at_start_of_excerpt(&mut self) -> bool {
6608 if self.diff_transforms.start().excerpt_dimension > *self.excerpts.start() {
6609 return false;
6610 } else if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
6611 return true;
6612 }
6613
6614 self.diff_transforms.prev();
6615 let prev_transform = self.diff_transforms.item();
6616 self.diff_transforms.next();
6617
6618 prev_transform.is_none_or(|next_transform| {
6619 matches!(next_transform, DiffTransform::BufferContent { .. })
6620 })
6621 }
6622
6623 fn is_at_end_of_excerpt(&mut self) -> bool {
6624 if self.diff_transforms.end().excerpt_dimension < self.excerpts.end() {
6625 return false;
6626 } else if self.diff_transforms.end().excerpt_dimension > self.excerpts.end()
6627 || self.diff_transforms.item().is_none()
6628 {
6629 return true;
6630 }
6631
6632 let next_transform = self.diff_transforms.next_item();
6633 next_transform.is_none_or(|next_transform| match next_transform {
6634 DiffTransform::BufferContent { .. } => true,
6635 DiffTransform::DeletedHunk { hunk_info, .. } => self
6636 .excerpts
6637 .item()
6638 .is_some_and(|excerpt| excerpt.id != hunk_info.excerpt_id),
6639 })
6640 }
6641
6642 fn main_buffer_position(&self) -> Option<D> {
6643 let excerpt = self.excerpts.item()?;
6644 let buffer = &excerpt.buffer;
6645 let buffer_context_start = excerpt.range.context.start.summary::<D>(buffer);
6646 let mut buffer_start = buffer_context_start;
6647 let overshoot = self.diff_transforms.end().excerpt_dimension.0 - self.excerpts.start().0;
6648 buffer_start.add_assign(&overshoot);
6649 Some(buffer_start)
6650 }
6651
6652 fn build_region(&self) -> Option<MultiBufferRegion<'a, D>> {
6653 let excerpt = self.excerpts.item()?;
6654 match self.diff_transforms.item()? {
6655 DiffTransform::DeletedHunk {
6656 buffer_id,
6657 base_text_byte_range,
6658 has_trailing_newline,
6659 hunk_info,
6660 ..
6661 } => {
6662 let diff = self.diffs.get(buffer_id)?;
6663 let buffer = diff.base_text();
6664 let mut rope_cursor = buffer.as_rope().cursor(0);
6665 let buffer_start = rope_cursor.summary::<D>(base_text_byte_range.start);
6666 let buffer_range_len = rope_cursor.summary::<D>(base_text_byte_range.end);
6667 let mut buffer_end = buffer_start;
6668 buffer_end.add_assign(&buffer_range_len);
6669 let start = self.diff_transforms.start().output_dimension.0;
6670 let end = self.diff_transforms.end().output_dimension.0;
6671 Some(MultiBufferRegion {
6672 buffer,
6673 excerpt,
6674 has_trailing_newline: *has_trailing_newline,
6675 is_main_buffer: false,
6676 diff_hunk_status: Some(DiffHunkStatus::deleted(
6677 hunk_info.hunk_secondary_status,
6678 )),
6679 buffer_range: buffer_start..buffer_end,
6680 range: start..end,
6681 })
6682 }
6683 DiffTransform::BufferContent {
6684 inserted_hunk_info, ..
6685 } => {
6686 let buffer = &excerpt.buffer;
6687 let buffer_context_start = excerpt.range.context.start.summary::<D>(buffer);
6688
6689 let mut start = self.diff_transforms.start().output_dimension.0;
6690 let mut buffer_start = buffer_context_start;
6691 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
6692 let overshoot =
6693 self.excerpts.start().0 - self.diff_transforms.start().excerpt_dimension.0;
6694 start.add_assign(&overshoot);
6695 } else {
6696 let overshoot =
6697 self.diff_transforms.start().excerpt_dimension.0 - self.excerpts.start().0;
6698 buffer_start.add_assign(&overshoot);
6699 }
6700
6701 let mut end;
6702 let mut buffer_end;
6703 let has_trailing_newline;
6704 if self.diff_transforms.end().excerpt_dimension.0 < self.excerpts.end().0 {
6705 let overshoot =
6706 self.diff_transforms.end().excerpt_dimension.0 - self.excerpts.start().0;
6707 end = self.diff_transforms.end().output_dimension.0;
6708 buffer_end = buffer_context_start;
6709 buffer_end.add_assign(&overshoot);
6710 has_trailing_newline = false;
6711 } else {
6712 let overshoot =
6713 self.excerpts.end().0 - self.diff_transforms.start().excerpt_dimension.0;
6714 end = self.diff_transforms.start().output_dimension.0;
6715 end.add_assign(&overshoot);
6716 buffer_end = excerpt.range.context.end.summary::<D>(buffer);
6717 has_trailing_newline = excerpt.has_trailing_newline;
6718 };
6719
6720 Some(MultiBufferRegion {
6721 buffer,
6722 excerpt,
6723 has_trailing_newline,
6724 is_main_buffer: true,
6725 diff_hunk_status: inserted_hunk_info
6726 .map(|info| DiffHunkStatus::added(info.hunk_secondary_status)),
6727 buffer_range: buffer_start..buffer_end,
6728 range: start..end,
6729 })
6730 }
6731 }
6732 }
6733
6734 fn excerpt(&self) -> Option<&'a Excerpt> {
6735 self.excerpts.item()
6736 }
6737}
6738
6739impl History {
6740 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
6741 self.transaction_depth += 1;
6742 if self.transaction_depth == 1 {
6743 let id = self.next_transaction_id.tick();
6744 self.undo_stack.push(Transaction {
6745 id,
6746 buffer_transactions: Default::default(),
6747 first_edit_at: now,
6748 last_edit_at: now,
6749 suppress_grouping: false,
6750 });
6751 Some(id)
6752 } else {
6753 None
6754 }
6755 }
6756
6757 fn end_transaction(
6758 &mut self,
6759 now: Instant,
6760 buffer_transactions: HashMap<BufferId, TransactionId>,
6761 ) -> bool {
6762 assert_ne!(self.transaction_depth, 0);
6763 self.transaction_depth -= 1;
6764 if self.transaction_depth == 0 {
6765 if buffer_transactions.is_empty() {
6766 self.undo_stack.pop();
6767 false
6768 } else {
6769 self.redo_stack.clear();
6770 let transaction = self.undo_stack.last_mut().unwrap();
6771 transaction.last_edit_at = now;
6772 for (buffer_id, transaction_id) in buffer_transactions {
6773 transaction
6774 .buffer_transactions
6775 .entry(buffer_id)
6776 .or_insert(transaction_id);
6777 }
6778 true
6779 }
6780 } else {
6781 false
6782 }
6783 }
6784
6785 fn push_transaction<'a, T>(
6786 &mut self,
6787 buffer_transactions: T,
6788 now: Instant,
6789 cx: &Context<MultiBuffer>,
6790 ) where
6791 T: IntoIterator<Item = (&'a Entity<Buffer>, &'a language::Transaction)>,
6792 {
6793 assert_eq!(self.transaction_depth, 0);
6794 let transaction = Transaction {
6795 id: self.next_transaction_id.tick(),
6796 buffer_transactions: buffer_transactions
6797 .into_iter()
6798 .map(|(buffer, transaction)| (buffer.read(cx).remote_id(), transaction.id))
6799 .collect(),
6800 first_edit_at: now,
6801 last_edit_at: now,
6802 suppress_grouping: false,
6803 };
6804 if !transaction.buffer_transactions.is_empty() {
6805 self.undo_stack.push(transaction);
6806 self.redo_stack.clear();
6807 }
6808 }
6809
6810 fn finalize_last_transaction(&mut self) {
6811 if let Some(transaction) = self.undo_stack.last_mut() {
6812 transaction.suppress_grouping = true;
6813 }
6814 }
6815
6816 fn forget(&mut self, transaction_id: TransactionId) -> Option<Transaction> {
6817 if let Some(ix) = self
6818 .undo_stack
6819 .iter()
6820 .rposition(|transaction| transaction.id == transaction_id)
6821 {
6822 Some(self.undo_stack.remove(ix))
6823 } else if let Some(ix) = self
6824 .redo_stack
6825 .iter()
6826 .rposition(|transaction| transaction.id == transaction_id)
6827 {
6828 Some(self.redo_stack.remove(ix))
6829 } else {
6830 None
6831 }
6832 }
6833
6834 fn transaction(&self, transaction_id: TransactionId) -> Option<&Transaction> {
6835 self.undo_stack
6836 .iter()
6837 .find(|transaction| transaction.id == transaction_id)
6838 .or_else(|| {
6839 self.redo_stack
6840 .iter()
6841 .find(|transaction| transaction.id == transaction_id)
6842 })
6843 }
6844
6845 fn transaction_mut(&mut self, transaction_id: TransactionId) -> Option<&mut Transaction> {
6846 self.undo_stack
6847 .iter_mut()
6848 .find(|transaction| transaction.id == transaction_id)
6849 .or_else(|| {
6850 self.redo_stack
6851 .iter_mut()
6852 .find(|transaction| transaction.id == transaction_id)
6853 })
6854 }
6855
6856 fn pop_undo(&mut self) -> Option<&mut Transaction> {
6857 assert_eq!(self.transaction_depth, 0);
6858 if let Some(transaction) = self.undo_stack.pop() {
6859 self.redo_stack.push(transaction);
6860 self.redo_stack.last_mut()
6861 } else {
6862 None
6863 }
6864 }
6865
6866 fn pop_redo(&mut self) -> Option<&mut Transaction> {
6867 assert_eq!(self.transaction_depth, 0);
6868 if let Some(transaction) = self.redo_stack.pop() {
6869 self.undo_stack.push(transaction);
6870 self.undo_stack.last_mut()
6871 } else {
6872 None
6873 }
6874 }
6875
6876 fn remove_from_undo(&mut self, transaction_id: TransactionId) -> Option<&Transaction> {
6877 let ix = self
6878 .undo_stack
6879 .iter()
6880 .rposition(|transaction| transaction.id == transaction_id)?;
6881 let transaction = self.undo_stack.remove(ix);
6882 self.redo_stack.push(transaction);
6883 self.redo_stack.last()
6884 }
6885
6886 fn group(&mut self) -> Option<TransactionId> {
6887 let mut count = 0;
6888 let mut transactions = self.undo_stack.iter();
6889 if let Some(mut transaction) = transactions.next_back() {
6890 while let Some(prev_transaction) = transactions.next_back() {
6891 if !prev_transaction.suppress_grouping
6892 && transaction.first_edit_at - prev_transaction.last_edit_at
6893 <= self.group_interval
6894 {
6895 transaction = prev_transaction;
6896 count += 1;
6897 } else {
6898 break;
6899 }
6900 }
6901 }
6902 self.group_trailing(count)
6903 }
6904
6905 fn group_until(&mut self, transaction_id: TransactionId) {
6906 let mut count = 0;
6907 for transaction in self.undo_stack.iter().rev() {
6908 if transaction.id == transaction_id {
6909 self.group_trailing(count);
6910 break;
6911 } else if transaction.suppress_grouping {
6912 break;
6913 } else {
6914 count += 1;
6915 }
6916 }
6917 }
6918
6919 fn group_trailing(&mut self, n: usize) -> Option<TransactionId> {
6920 let new_len = self.undo_stack.len() - n;
6921 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
6922 if let Some(last_transaction) = transactions_to_keep.last_mut() {
6923 if let Some(transaction) = transactions_to_merge.last() {
6924 last_transaction.last_edit_at = transaction.last_edit_at;
6925 }
6926 for to_merge in transactions_to_merge {
6927 for (buffer_id, transaction_id) in &to_merge.buffer_transactions {
6928 last_transaction
6929 .buffer_transactions
6930 .entry(*buffer_id)
6931 .or_insert(*transaction_id);
6932 }
6933 }
6934 }
6935
6936 self.undo_stack.truncate(new_len);
6937 self.undo_stack.last().map(|t| t.id)
6938 }
6939}
6940
6941impl Excerpt {
6942 fn new(
6943 id: ExcerptId,
6944 locator: Locator,
6945 buffer_id: BufferId,
6946 buffer: BufferSnapshot,
6947 range: ExcerptRange<text::Anchor>,
6948 has_trailing_newline: bool,
6949 ) -> Self {
6950 Excerpt {
6951 id,
6952 locator,
6953 max_buffer_row: range.context.end.to_point(&buffer).row,
6954 text_summary: buffer
6955 .text_summary_for_range::<TextSummary, _>(range.context.to_offset(&buffer)),
6956 buffer_id,
6957 buffer,
6958 range,
6959 has_trailing_newline,
6960 }
6961 }
6962
6963 fn chunks_in_range(&self, range: Range<usize>, language_aware: bool) -> ExcerptChunks<'_> {
6964 let content_start = self.range.context.start.to_offset(&self.buffer);
6965 let chunks_start = content_start + range.start;
6966 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
6967
6968 let footer_height = if self.has_trailing_newline
6969 && range.start <= self.text_summary.len
6970 && range.end > self.text_summary.len
6971 {
6972 1
6973 } else {
6974 0
6975 };
6976
6977 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
6978
6979 ExcerptChunks {
6980 excerpt_id: self.id,
6981 content_chunks,
6982 footer_height,
6983 }
6984 }
6985
6986 fn seek_chunks(&self, excerpt_chunks: &mut ExcerptChunks, range: Range<usize>) {
6987 let content_start = self.range.context.start.to_offset(&self.buffer);
6988 let chunks_start = content_start + range.start;
6989 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
6990 excerpt_chunks.content_chunks.seek(chunks_start..chunks_end);
6991 excerpt_chunks.footer_height = if self.has_trailing_newline
6992 && range.start <= self.text_summary.len
6993 && range.end > self.text_summary.len
6994 {
6995 1
6996 } else {
6997 0
6998 };
6999 }
7000
7001 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
7002 if text_anchor
7003 .cmp(&self.range.context.start, &self.buffer)
7004 .is_lt()
7005 {
7006 self.range.context.start
7007 } else if text_anchor
7008 .cmp(&self.range.context.end, &self.buffer)
7009 .is_gt()
7010 {
7011 self.range.context.end
7012 } else {
7013 text_anchor
7014 }
7015 }
7016
7017 fn contains(&self, anchor: &Anchor) -> bool {
7018 (anchor.buffer_id == None || anchor.buffer_id == Some(self.buffer_id))
7019 && self
7020 .range
7021 .context
7022 .start
7023 .cmp(&anchor.text_anchor, &self.buffer)
7024 .is_le()
7025 && self
7026 .range
7027 .context
7028 .end
7029 .cmp(&anchor.text_anchor, &self.buffer)
7030 .is_ge()
7031 }
7032
7033 /// The [`Excerpt`]'s start offset in its [`Buffer`]
7034 fn buffer_start_offset(&self) -> usize {
7035 self.range.context.start.to_offset(&self.buffer)
7036 }
7037
7038 /// The [`Excerpt`]'s end offset in its [`Buffer`]
7039 fn buffer_end_offset(&self) -> usize {
7040 self.buffer_start_offset() + self.text_summary.len
7041 }
7042}
7043
7044impl<'a> MultiBufferExcerpt<'a> {
7045 pub fn id(&self) -> ExcerptId {
7046 self.excerpt.id
7047 }
7048
7049 pub fn buffer_id(&self) -> BufferId {
7050 self.excerpt.buffer_id
7051 }
7052
7053 pub fn start_anchor(&self) -> Anchor {
7054 Anchor {
7055 buffer_id: Some(self.excerpt.buffer_id),
7056 excerpt_id: self.excerpt.id,
7057 text_anchor: self.excerpt.range.context.start,
7058 diff_base_anchor: None,
7059 }
7060 }
7061
7062 pub fn end_anchor(&self) -> Anchor {
7063 Anchor {
7064 buffer_id: Some(self.excerpt.buffer_id),
7065 excerpt_id: self.excerpt.id,
7066 text_anchor: self.excerpt.range.context.end,
7067 diff_base_anchor: None,
7068 }
7069 }
7070
7071 pub fn buffer(&self) -> &'a BufferSnapshot {
7072 &self.excerpt.buffer
7073 }
7074
7075 pub fn buffer_range(&self) -> Range<usize> {
7076 self.buffer_offset
7077 ..self
7078 .excerpt
7079 .range
7080 .context
7081 .end
7082 .to_offset(&self.excerpt.buffer.text)
7083 }
7084
7085 pub fn start_offset(&self) -> usize {
7086 self.offset
7087 }
7088
7089 /// Maps an offset within the [`MultiBuffer`] to an offset within the [`Buffer`]
7090 pub fn map_offset_to_buffer(&mut self, offset: usize) -> usize {
7091 self.map_range_to_buffer(offset..offset).start
7092 }
7093
7094 /// Maps a range within the [`MultiBuffer`] to a range within the [`Buffer`]
7095 pub fn map_range_to_buffer(&mut self, range: Range<usize>) -> Range<usize> {
7096 self.diff_transforms
7097 .seek(&OutputDimension(range.start), Bias::Right);
7098 let start = self.map_offset_to_buffer_internal(range.start);
7099 let end = if range.end > range.start {
7100 self.diff_transforms
7101 .seek_forward(&OutputDimension(range.end), Bias::Right);
7102 self.map_offset_to_buffer_internal(range.end)
7103 } else {
7104 start
7105 };
7106 start..end
7107 }
7108
7109 fn map_offset_to_buffer_internal(&self, offset: usize) -> usize {
7110 let mut excerpt_offset = self.diff_transforms.start().excerpt_dimension.clone();
7111 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7112 excerpt_offset.0 += offset - self.diff_transforms.start().output_dimension.0;
7113 };
7114 let offset_in_excerpt = excerpt_offset.0.saturating_sub(self.excerpt_offset.0);
7115 self.buffer_offset + offset_in_excerpt
7116 }
7117
7118 /// Map an offset within the [`Buffer`] to an offset within the [`MultiBuffer`]
7119 pub fn map_offset_from_buffer(&mut self, buffer_offset: usize) -> usize {
7120 self.map_range_from_buffer(buffer_offset..buffer_offset)
7121 .start
7122 }
7123
7124 /// Map a range within the [`Buffer`] to a range within the [`MultiBuffer`]
7125 pub fn map_range_from_buffer(&mut self, buffer_range: Range<usize>) -> Range<usize> {
7126 if buffer_range.start < self.buffer_offset {
7127 log::warn!(
7128 "Attempting to map a range from a buffer offset that starts before the current buffer offset"
7129 );
7130 return buffer_range;
7131 }
7132 let overshoot = buffer_range.start - self.buffer_offset;
7133 let excerpt_offset = ExcerptDimension(self.excerpt_offset.0 + overshoot);
7134 self.diff_transforms.seek(&excerpt_offset, Bias::Right);
7135 if excerpt_offset.0 < self.diff_transforms.start().excerpt_dimension.0 {
7136 log::warn!(
7137 "Attempting to map a range from a buffer offset that starts before the current buffer offset"
7138 );
7139 return buffer_range;
7140 }
7141 let overshoot = excerpt_offset.0 - self.diff_transforms.start().excerpt_dimension.0;
7142 let start = self.diff_transforms.start().output_dimension.0 + overshoot;
7143
7144 let end = if buffer_range.end > buffer_range.start {
7145 let overshoot = buffer_range.end - self.buffer_offset;
7146 let excerpt_offset = ExcerptDimension(self.excerpt_offset.0 + overshoot);
7147 self.diff_transforms
7148 .seek_forward(&excerpt_offset, Bias::Right);
7149 let overshoot = excerpt_offset.0 - self.diff_transforms.start().excerpt_dimension.0;
7150 self.diff_transforms.start().output_dimension.0 + overshoot
7151 } else {
7152 start
7153 };
7154
7155 start..end
7156 }
7157
7158 /// Returns true if the entirety of the given range is in the buffer's excerpt
7159 pub fn contains_buffer_range(&self, range: Range<usize>) -> bool {
7160 range.start >= self.excerpt.buffer_start_offset()
7161 && range.end <= self.excerpt.buffer_end_offset()
7162 }
7163
7164 pub fn max_buffer_row(&self) -> u32 {
7165 self.excerpt.max_buffer_row
7166 }
7167}
7168
7169impl ExcerptId {
7170 pub fn min() -> Self {
7171 Self(0)
7172 }
7173
7174 pub fn max() -> Self {
7175 Self(usize::MAX)
7176 }
7177
7178 pub fn to_proto(self) -> u64 {
7179 self.0 as _
7180 }
7181
7182 pub fn from_proto(proto: u64) -> Self {
7183 Self(proto as _)
7184 }
7185
7186 pub fn cmp(&self, other: &Self, snapshot: &MultiBufferSnapshot) -> cmp::Ordering {
7187 let a = snapshot.excerpt_locator_for_id(*self);
7188 let b = snapshot.excerpt_locator_for_id(*other);
7189 a.cmp(b).then_with(|| self.0.cmp(&other.0))
7190 }
7191}
7192
7193impl From<ExcerptId> for usize {
7194 fn from(val: ExcerptId) -> Self {
7195 val.0
7196 }
7197}
7198
7199impl fmt::Debug for Excerpt {
7200 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
7201 f.debug_struct("Excerpt")
7202 .field("id", &self.id)
7203 .field("locator", &self.locator)
7204 .field("buffer_id", &self.buffer_id)
7205 .field("range", &self.range)
7206 .field("text_summary", &self.text_summary)
7207 .field("has_trailing_newline", &self.has_trailing_newline)
7208 .finish()
7209 }
7210}
7211
7212impl sum_tree::Item for Excerpt {
7213 type Summary = ExcerptSummary;
7214
7215 fn summary(&self, _cx: &()) -> Self::Summary {
7216 let mut text = self.text_summary;
7217 if self.has_trailing_newline {
7218 text += TextSummary::from("\n");
7219 }
7220 ExcerptSummary {
7221 excerpt_id: self.id,
7222 excerpt_locator: self.locator.clone(),
7223 widest_line_number: self.max_buffer_row,
7224 text,
7225 }
7226 }
7227}
7228
7229impl sum_tree::Item for ExcerptIdMapping {
7230 type Summary = ExcerptId;
7231
7232 fn summary(&self, _cx: &()) -> Self::Summary {
7233 self.id
7234 }
7235}
7236
7237impl sum_tree::KeyedItem for ExcerptIdMapping {
7238 type Key = ExcerptId;
7239
7240 fn key(&self) -> Self::Key {
7241 self.id
7242 }
7243}
7244
7245impl DiffTransform {
7246 fn hunk_info(&self) -> Option<DiffTransformHunkInfo> {
7247 match self {
7248 DiffTransform::DeletedHunk { hunk_info, .. } => Some(*hunk_info),
7249 DiffTransform::BufferContent {
7250 inserted_hunk_info, ..
7251 } => *inserted_hunk_info,
7252 }
7253 }
7254}
7255
7256impl sum_tree::Item for DiffTransform {
7257 type Summary = DiffTransformSummary;
7258
7259 fn summary(&self, _: &<Self::Summary as sum_tree::Summary>::Context) -> Self::Summary {
7260 match self {
7261 DiffTransform::BufferContent { summary, .. } => DiffTransformSummary {
7262 input: *summary,
7263 output: *summary,
7264 },
7265 DiffTransform::DeletedHunk { summary, .. } => DiffTransformSummary {
7266 input: TextSummary::default(),
7267 output: *summary,
7268 },
7269 }
7270 }
7271}
7272
7273impl DiffTransformSummary {
7274 fn excerpt_len(&self) -> ExcerptOffset {
7275 ExcerptOffset::new(self.input.len)
7276 }
7277}
7278
7279impl sum_tree::Summary for DiffTransformSummary {
7280 type Context = ();
7281
7282 fn zero(_: &Self::Context) -> Self {
7283 DiffTransformSummary {
7284 input: TextSummary::default(),
7285 output: TextSummary::default(),
7286 }
7287 }
7288
7289 fn add_summary(&mut self, summary: &Self, _: &Self::Context) {
7290 self.input += &summary.input;
7291 self.output += &summary.output;
7292 }
7293}
7294
7295impl sum_tree::Summary for ExcerptId {
7296 type Context = ();
7297
7298 fn zero(_cx: &()) -> Self {
7299 Default::default()
7300 }
7301
7302 fn add_summary(&mut self, other: &Self, _: &()) {
7303 *self = *other;
7304 }
7305}
7306
7307impl sum_tree::Summary for ExcerptSummary {
7308 type Context = ();
7309
7310 fn zero(_cx: &()) -> Self {
7311 Default::default()
7312 }
7313
7314 fn add_summary(&mut self, summary: &Self, _: &()) {
7315 debug_assert!(summary.excerpt_locator > self.excerpt_locator);
7316 self.excerpt_locator = summary.excerpt_locator.clone();
7317 Summary::add_summary(&mut self.text, &summary.text, &());
7318 self.widest_line_number = cmp::max(self.widest_line_number, summary.widest_line_number);
7319 }
7320}
7321
7322impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for ExcerptOffset {
7323 fn zero(_cx: &()) -> Self {
7324 Default::default()
7325 }
7326
7327 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7328 self.value += summary.text.len;
7329 }
7330}
7331
7332impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for ExcerptOffset {
7333 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
7334 Ord::cmp(&self.value, &cursor_location.text.len)
7335 }
7336}
7337
7338impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, Option<&'a Locator>> for Locator {
7339 fn cmp(&self, cursor_location: &Option<&'a Locator>, _: &()) -> cmp::Ordering {
7340 Ord::cmp(&Some(self), cursor_location)
7341 }
7342}
7343
7344impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for Locator {
7345 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
7346 Ord::cmp(self, &cursor_location.excerpt_locator)
7347 }
7348}
7349
7350impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for ExcerptPoint {
7351 fn zero(_cx: &()) -> Self {
7352 Default::default()
7353 }
7354
7355 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7356 self.value += summary.text.lines;
7357 }
7358}
7359
7360impl<'a, D: TextDimension + Default> sum_tree::Dimension<'a, ExcerptSummary>
7361 for ExcerptDimension<D>
7362{
7363 fn zero(_: &()) -> Self {
7364 ExcerptDimension(D::default())
7365 }
7366
7367 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7368 self.0.add_assign(&D::from_text_summary(&summary.text))
7369 }
7370}
7371
7372impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a Locator> {
7373 fn zero(_cx: &()) -> Self {
7374 Default::default()
7375 }
7376
7377 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7378 *self = Some(&summary.excerpt_locator);
7379 }
7380}
7381
7382impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<ExcerptId> {
7383 fn zero(_cx: &()) -> Self {
7384 Default::default()
7385 }
7386
7387 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7388 *self = Some(summary.excerpt_id);
7389 }
7390}
7391
7392#[derive(Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7393struct ExcerptDimension<T>(T);
7394
7395#[derive(Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7396struct OutputDimension<T>(T);
7397
7398impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for ExcerptOffset {
7399 fn zero(_: &()) -> Self {
7400 ExcerptOffset::new(0)
7401 }
7402
7403 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7404 self.value += summary.input.len;
7405 }
7406}
7407
7408impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for ExcerptPoint {
7409 fn zero(_: &()) -> Self {
7410 ExcerptPoint::new(0, 0)
7411 }
7412
7413 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7414 self.value += summary.input.lines;
7415 }
7416}
7417
7418impl<D: TextDimension + Ord> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransformSummary>
7419 for ExcerptDimension<D>
7420{
7421 fn cmp(&self, cursor_location: &DiffTransformSummary, _: &()) -> cmp::Ordering {
7422 Ord::cmp(&self.0, &D::from_text_summary(&cursor_location.input))
7423 }
7424}
7425
7426impl<D: TextDimension + Ord> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransforms<D>>
7427 for ExcerptDimension<D>
7428{
7429 fn cmp(&self, cursor_location: &DiffTransforms<D>, _: &()) -> cmp::Ordering {
7430 Ord::cmp(&self.0, &cursor_location.excerpt_dimension.0)
7431 }
7432}
7433
7434impl<'a, D: TextDimension> sum_tree::Dimension<'a, DiffTransformSummary> for ExcerptDimension<D> {
7435 fn zero(_: &()) -> Self {
7436 ExcerptDimension(D::default())
7437 }
7438
7439 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7440 self.0.add_assign(&D::from_text_summary(&summary.input))
7441 }
7442}
7443
7444impl<D: TextDimension + Ord> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransforms<D>>
7445 for OutputDimension<D>
7446{
7447 fn cmp(&self, cursor_location: &DiffTransforms<D>, _: &()) -> cmp::Ordering {
7448 Ord::cmp(&self.0, &cursor_location.output_dimension.0)
7449 }
7450}
7451
7452impl<'a, D: TextDimension> sum_tree::Dimension<'a, DiffTransformSummary> for OutputDimension<D> {
7453 fn zero(_: &()) -> Self {
7454 OutputDimension(D::default())
7455 }
7456
7457 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7458 self.0.add_assign(&D::from_text_summary(&summary.output))
7459 }
7460}
7461
7462impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for TextSummary {
7463 fn zero(_: &()) -> Self {
7464 TextSummary::default()
7465 }
7466
7467 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7468 *self += summary.output
7469 }
7470}
7471
7472impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for usize {
7473 fn zero(_: &()) -> Self {
7474 0
7475 }
7476
7477 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7478 *self += summary.output.len
7479 }
7480}
7481
7482impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for Point {
7483 fn zero(_: &()) -> Self {
7484 Point::new(0, 0)
7485 }
7486
7487 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7488 *self += summary.output.lines
7489 }
7490}
7491
7492impl MultiBufferRows<'_> {
7493 pub fn seek(&mut self, MultiBufferRow(row): MultiBufferRow) {
7494 self.point = Point::new(row, 0);
7495 self.cursor.seek(&self.point);
7496 }
7497}
7498
7499impl Iterator for MultiBufferRows<'_> {
7500 type Item = RowInfo;
7501
7502 fn next(&mut self) -> Option<Self::Item> {
7503 if self.is_empty && self.point.row == 0 {
7504 self.point += Point::new(1, 0);
7505 return Some(RowInfo {
7506 buffer_id: None,
7507 buffer_row: Some(0),
7508 multibuffer_row: Some(MultiBufferRow(0)),
7509 diff_status: None,
7510 expand_info: None,
7511 });
7512 }
7513
7514 let mut region = self.cursor.region()?;
7515 while self.point >= region.range.end {
7516 self.cursor.next();
7517 if let Some(next_region) = self.cursor.region() {
7518 region = next_region;
7519 } else if self.point == self.cursor.diff_transforms.end().output_dimension.0 {
7520 let multibuffer_row = MultiBufferRow(self.point.row);
7521 let last_excerpt = self
7522 .cursor
7523 .excerpts
7524 .item()
7525 .or(self.cursor.excerpts.prev_item())?;
7526 let last_row = last_excerpt
7527 .range
7528 .context
7529 .end
7530 .to_point(&last_excerpt.buffer)
7531 .row;
7532
7533 let first_row = last_excerpt
7534 .range
7535 .context
7536 .start
7537 .to_point(&last_excerpt.buffer)
7538 .row;
7539
7540 let expand_info = if self.is_singleton {
7541 None
7542 } else {
7543 let needs_expand_up = first_row == last_row
7544 && last_row > 0
7545 && !region.diff_hunk_status.is_some_and(|d| d.is_deleted());
7546 let needs_expand_down = last_row < last_excerpt.buffer.max_point().row;
7547
7548 if needs_expand_up && needs_expand_down {
7549 Some(ExpandExcerptDirection::UpAndDown)
7550 } else if needs_expand_up {
7551 Some(ExpandExcerptDirection::Up)
7552 } else if needs_expand_down {
7553 Some(ExpandExcerptDirection::Down)
7554 } else {
7555 None
7556 }
7557 .map(|direction| ExpandInfo {
7558 direction,
7559 excerpt_id: last_excerpt.id,
7560 })
7561 };
7562 self.point += Point::new(1, 0);
7563 return Some(RowInfo {
7564 buffer_id: Some(last_excerpt.buffer_id),
7565 buffer_row: Some(last_row),
7566 multibuffer_row: Some(multibuffer_row),
7567 diff_status: None,
7568 expand_info,
7569 });
7570 } else {
7571 return None;
7572 };
7573 }
7574
7575 let overshoot = self.point - region.range.start;
7576 let buffer_point = region.buffer_range.start + overshoot;
7577 let expand_info = if self.is_singleton {
7578 None
7579 } else {
7580 let needs_expand_up = self.point.row == region.range.start.row
7581 && self.cursor.is_at_start_of_excerpt()
7582 && buffer_point.row > 0;
7583 let needs_expand_down = (region.excerpt.has_trailing_newline
7584 && self.point.row + 1 == region.range.end.row
7585 || !region.excerpt.has_trailing_newline && self.point.row == region.range.end.row)
7586 && self.cursor.is_at_end_of_excerpt()
7587 && buffer_point.row < region.buffer.max_point().row;
7588
7589 if needs_expand_up && needs_expand_down {
7590 Some(ExpandExcerptDirection::UpAndDown)
7591 } else if needs_expand_up {
7592 Some(ExpandExcerptDirection::Up)
7593 } else if needs_expand_down {
7594 Some(ExpandExcerptDirection::Down)
7595 } else {
7596 None
7597 }
7598 .map(|direction| ExpandInfo {
7599 direction,
7600 excerpt_id: region.excerpt.id,
7601 })
7602 };
7603
7604 let result = Some(RowInfo {
7605 buffer_id: Some(region.buffer.remote_id()),
7606 buffer_row: Some(buffer_point.row),
7607 multibuffer_row: Some(MultiBufferRow(self.point.row)),
7608 diff_status: region
7609 .diff_hunk_status
7610 .filter(|_| self.point < region.range.end),
7611 expand_info,
7612 });
7613 self.point += Point::new(1, 0);
7614 result
7615 }
7616}
7617
7618impl<'a> MultiBufferChunks<'a> {
7619 pub fn offset(&self) -> usize {
7620 self.range.start
7621 }
7622
7623 pub fn seek(&mut self, range: Range<usize>) {
7624 self.diff_transforms.seek(&range.end, Bias::Right);
7625 let mut excerpt_end = self.diff_transforms.start().1;
7626 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7627 let overshoot = range.end - self.diff_transforms.start().0;
7628 excerpt_end.value += overshoot;
7629 }
7630
7631 self.diff_transforms.seek(&range.start, Bias::Right);
7632 let mut excerpt_start = self.diff_transforms.start().1;
7633 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7634 let overshoot = range.start - self.diff_transforms.start().0;
7635 excerpt_start.value += overshoot;
7636 }
7637
7638 self.seek_to_excerpt_offset_range(excerpt_start..excerpt_end);
7639 self.buffer_chunk.take();
7640 self.range = range;
7641 }
7642
7643 fn seek_to_excerpt_offset_range(&mut self, new_range: Range<ExcerptOffset>) {
7644 self.excerpt_offset_range = new_range.clone();
7645 self.excerpts.seek(&new_range.start, Bias::Right);
7646 if let Some(excerpt) = self.excerpts.item() {
7647 let excerpt_start = *self.excerpts.start();
7648 if let Some(excerpt_chunks) = self
7649 .excerpt_chunks
7650 .as_mut()
7651 .filter(|chunks| excerpt.id == chunks.excerpt_id)
7652 {
7653 excerpt.seek_chunks(
7654 excerpt_chunks,
7655 (self.excerpt_offset_range.start - excerpt_start).value
7656 ..(self.excerpt_offset_range.end - excerpt_start).value,
7657 );
7658 } else {
7659 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7660 (self.excerpt_offset_range.start - excerpt_start).value
7661 ..(self.excerpt_offset_range.end - excerpt_start).value,
7662 self.language_aware,
7663 ));
7664 }
7665 } else {
7666 self.excerpt_chunks = None;
7667 }
7668 }
7669
7670 fn next_excerpt_chunk(&mut self) -> Option<Chunk<'a>> {
7671 loop {
7672 if self.excerpt_offset_range.is_empty() {
7673 return None;
7674 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
7675 self.excerpt_offset_range.start.value += chunk.text.len();
7676 return Some(chunk);
7677 } else {
7678 self.excerpts.next();
7679 let excerpt = self.excerpts.item()?;
7680 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7681 0..(self.excerpt_offset_range.end - *self.excerpts.start()).value,
7682 self.language_aware,
7683 ));
7684 }
7685 }
7686 }
7687}
7688
7689impl<'a> Iterator for ReversedMultiBufferChunks<'a> {
7690 type Item = &'a str;
7691
7692 fn next(&mut self) -> Option<Self::Item> {
7693 let mut region = self.cursor.region()?;
7694 if self.offset == region.range.start {
7695 self.cursor.prev();
7696 region = self.cursor.region()?;
7697 let start_overshoot = self.start.saturating_sub(region.range.start);
7698 self.current_chunks = Some(region.buffer.reversed_chunks_in_range(
7699 region.buffer_range.start + start_overshoot..region.buffer_range.end,
7700 ));
7701 }
7702
7703 if self.offset == region.range.end && region.has_trailing_newline {
7704 self.offset -= 1;
7705 Some("\n")
7706 } else {
7707 let chunk = self.current_chunks.as_mut().unwrap().next()?;
7708 self.offset -= chunk.len();
7709 Some(chunk)
7710 }
7711 }
7712}
7713
7714impl<'a> Iterator for MultiBufferChunks<'a> {
7715 type Item = Chunk<'a>;
7716
7717 fn next(&mut self) -> Option<Chunk<'a>> {
7718 if self.range.start >= self.range.end {
7719 return None;
7720 }
7721 if self.range.start == self.diff_transforms.end().0 {
7722 self.diff_transforms.next();
7723 }
7724
7725 let diff_transform_start = self.diff_transforms.start().0;
7726 let diff_transform_end = self.diff_transforms.end().0;
7727 debug_assert!(self.range.start < diff_transform_end);
7728
7729 let diff_transform = self.diff_transforms.item()?;
7730 match diff_transform {
7731 DiffTransform::BufferContent { .. } => {
7732 let chunk = if let Some(chunk) = &mut self.buffer_chunk {
7733 chunk
7734 } else {
7735 let chunk = self.next_excerpt_chunk().unwrap();
7736 self.buffer_chunk.insert(chunk)
7737 };
7738
7739 let chunk_end = self.range.start + chunk.text.len();
7740 let diff_transform_end = diff_transform_end.min(self.range.end);
7741
7742 if diff_transform_end < chunk_end {
7743 let split_idx = diff_transform_end - self.range.start;
7744 let (before, after) = chunk.text.split_at(split_idx);
7745 self.range.start = diff_transform_end;
7746 let mask = (1 << split_idx) - 1;
7747 let chars = chunk.chars & mask;
7748 let tabs = chunk.tabs & mask;
7749
7750 chunk.text = after;
7751 chunk.chars = chunk.chars >> split_idx;
7752 chunk.tabs = chunk.tabs >> split_idx;
7753
7754 Some(Chunk {
7755 text: before,
7756 chars,
7757 tabs,
7758 ..chunk.clone()
7759 })
7760 } else {
7761 self.range.start = chunk_end;
7762 self.buffer_chunk.take()
7763 }
7764 }
7765 DiffTransform::DeletedHunk {
7766 buffer_id,
7767 base_text_byte_range,
7768 has_trailing_newline,
7769 ..
7770 } => {
7771 let base_text_start =
7772 base_text_byte_range.start + self.range.start - diff_transform_start;
7773 let base_text_end =
7774 base_text_byte_range.start + self.range.end - diff_transform_start;
7775 let base_text_end = base_text_end.min(base_text_byte_range.end);
7776
7777 let mut chunks = if let Some((_, mut chunks)) = self
7778 .diff_base_chunks
7779 .take()
7780 .filter(|(id, _)| id == buffer_id)
7781 {
7782 if chunks.range().start != base_text_start || chunks.range().end < base_text_end
7783 {
7784 chunks.seek(base_text_start..base_text_end);
7785 }
7786 chunks
7787 } else {
7788 let base_buffer = &self.diffs.get(buffer_id)?.base_text();
7789 base_buffer.chunks(base_text_start..base_text_end, self.language_aware)
7790 };
7791
7792 let chunk = if let Some(chunk) = chunks.next() {
7793 self.range.start += chunk.text.len();
7794 self.diff_base_chunks = Some((*buffer_id, chunks));
7795 chunk
7796 } else {
7797 debug_assert!(has_trailing_newline);
7798 self.range.start += "\n".len();
7799 Chunk {
7800 text: "\n",
7801 chars: 1u128,
7802 ..Default::default()
7803 }
7804 };
7805 Some(chunk)
7806 }
7807 }
7808 }
7809}
7810
7811impl MultiBufferBytes<'_> {
7812 fn consume(&mut self, len: usize) {
7813 self.range.start += len;
7814 self.chunk = &self.chunk[len..];
7815
7816 if !self.range.is_empty() && self.chunk.is_empty() {
7817 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
7818 self.chunk = chunk;
7819 } else if self.has_trailing_newline {
7820 self.has_trailing_newline = false;
7821 self.chunk = b"\n";
7822 } else {
7823 self.cursor.next();
7824 if let Some(region) = self.cursor.region() {
7825 let mut excerpt_bytes = region.buffer.bytes_in_range(
7826 region.buffer_range.start
7827 ..(region.buffer_range.start + self.range.end - region.range.start)
7828 .min(region.buffer_range.end),
7829 );
7830 self.chunk = excerpt_bytes.next().unwrap_or(&[]);
7831 self.excerpt_bytes = Some(excerpt_bytes);
7832 self.has_trailing_newline =
7833 region.has_trailing_newline && self.range.end >= region.range.end;
7834 if self.chunk.is_empty() && self.has_trailing_newline {
7835 self.has_trailing_newline = false;
7836 self.chunk = b"\n";
7837 }
7838 }
7839 }
7840 }
7841 }
7842}
7843
7844impl<'a> Iterator for MultiBufferBytes<'a> {
7845 type Item = &'a [u8];
7846
7847 fn next(&mut self) -> Option<Self::Item> {
7848 let chunk = self.chunk;
7849 if chunk.is_empty() {
7850 None
7851 } else {
7852 self.consume(chunk.len());
7853 Some(chunk)
7854 }
7855 }
7856}
7857
7858impl io::Read for MultiBufferBytes<'_> {
7859 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
7860 let len = cmp::min(buf.len(), self.chunk.len());
7861 buf[..len].copy_from_slice(&self.chunk[..len]);
7862 if len > 0 {
7863 self.consume(len);
7864 }
7865 Ok(len)
7866 }
7867}
7868
7869impl io::Read for ReversedMultiBufferBytes<'_> {
7870 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
7871 let len = cmp::min(buf.len(), self.chunk.len());
7872 buf[..len].copy_from_slice(&self.chunk[..len]);
7873 buf[..len].reverse();
7874 if len > 0 {
7875 self.range.end -= len;
7876 self.chunk = &self.chunk[..self.chunk.len() - len];
7877 if !self.range.is_empty()
7878 && self.chunk.is_empty()
7879 && let Some(chunk) = self.chunks.next()
7880 {
7881 self.chunk = chunk.as_bytes();
7882 }
7883 }
7884 Ok(len)
7885 }
7886}
7887
7888impl<'a> Iterator for ExcerptChunks<'a> {
7889 type Item = Chunk<'a>;
7890
7891 fn next(&mut self) -> Option<Self::Item> {
7892 if let Some(chunk) = self.content_chunks.next() {
7893 return Some(chunk);
7894 }
7895
7896 if self.footer_height > 0 {
7897 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
7898 let chars = (1 << self.footer_height) - 1;
7899 self.footer_height = 0;
7900 return Some(Chunk {
7901 text,
7902 chars,
7903 ..Default::default()
7904 });
7905 }
7906
7907 None
7908 }
7909}
7910
7911impl ToOffset for Point {
7912 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7913 snapshot.point_to_offset(*self)
7914 }
7915}
7916
7917impl ToOffset for usize {
7918 #[track_caller]
7919 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7920 assert!(
7921 *self <= snapshot.len(),
7922 "offset {} is greater than the snapshot.len() {}",
7923 *self,
7924 snapshot.len(),
7925 );
7926 *self
7927 }
7928}
7929
7930impl ToOffset for OffsetUtf16 {
7931 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7932 snapshot.offset_utf16_to_offset(*self)
7933 }
7934}
7935
7936impl ToOffset for PointUtf16 {
7937 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7938 snapshot.point_utf16_to_offset(*self)
7939 }
7940}
7941
7942impl ToOffsetUtf16 for OffsetUtf16 {
7943 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
7944 *self
7945 }
7946}
7947
7948impl ToOffsetUtf16 for usize {
7949 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
7950 snapshot.offset_to_offset_utf16(*self)
7951 }
7952}
7953
7954impl ToPoint for usize {
7955 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
7956 snapshot.offset_to_point(*self)
7957 }
7958}
7959
7960impl ToPoint for Point {
7961 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
7962 *self
7963 }
7964}
7965
7966impl ToPointUtf16 for usize {
7967 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
7968 snapshot.offset_to_point_utf16(*self)
7969 }
7970}
7971
7972impl ToPointUtf16 for Point {
7973 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
7974 snapshot.point_to_point_utf16(*self)
7975 }
7976}
7977
7978impl ToPointUtf16 for PointUtf16 {
7979 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
7980 *self
7981 }
7982}
7983
7984impl From<ExcerptId> for EntityId {
7985 fn from(id: ExcerptId) -> Self {
7986 EntityId::from(id.0 as u64)
7987 }
7988}