1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt, Offset};
4use anyhow::{anyhow, Result};
5use clock::ReplicaId;
6use collections::{BTreeMap, Bound, HashMap, HashSet};
7use futures::{channel::mpsc, SinkExt};
8use git::diff::DiffHunk;
9use gpui::{AppContext, EventEmitter, Model, ModelContext};
10use itertools::Itertools;
11use language::{
12 char_kind,
13 language_settings::{language_settings, LanguageSettings},
14 AutoindentMode, Buffer, BufferChunks, BufferSnapshot, Capability, CharKind, Chunk, CursorShape,
15 DiagnosticEntry, File, IndentSize, Language, LanguageScope, OffsetRangeExt, OffsetUtf16,
16 Outline, OutlineItem, Point, PointUtf16, Selection, TextDimension, ToOffset as _,
17 ToOffsetUtf16 as _, ToPoint as _, ToPointUtf16 as _, TransactionId, Unclipped,
18};
19use smallvec::SmallVec;
20use std::{
21 borrow::Cow,
22 cell::{Ref, RefCell},
23 cmp, fmt,
24 future::Future,
25 io,
26 iter::{self, FromIterator},
27 mem,
28 ops::{Range, RangeBounds, Sub},
29 str,
30 sync::Arc,
31 time::{Duration, Instant},
32};
33use sum_tree::{Bias, Cursor, SumTree};
34use text::{
35 locator::Locator,
36 subscription::{Subscription, Topic},
37 BufferId, Edit, TextSummary,
38};
39use theme::SyntaxTheme;
40
41use util::post_inc;
42
43#[cfg(any(test, feature = "test-support"))]
44use gpui::Context;
45
46const NEWLINES: &[u8] = &[b'\n'; u8::MAX as usize];
47
48#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
49pub struct ExcerptId(usize);
50
51/// One or more [`Buffers`](Buffer) being edited in a single view.
52///
53/// See <https://zed.dev/features#multi-buffers>
54pub struct MultiBuffer {
55 /// A snapshot of the [`Excerpt`]s in the MultiBuffer.
56 /// Use [`MultiBuffer::snapshot`] to get a up-to-date snapshot.
57 snapshot: RefCell<MultiBufferSnapshot>,
58 /// Contains the state of the buffers being edited
59 buffers: RefCell<HashMap<BufferId, BufferState>>,
60 subscriptions: Topic,
61 /// If true, the multi-buffer only contains a single [`Buffer`] and a single [`Excerpt`]
62 singleton: bool,
63 replica_id: ReplicaId,
64 history: History,
65 title: Option<String>,
66 capability: Capability,
67}
68
69#[derive(Clone, Debug, PartialEq, Eq)]
70pub enum Event {
71 ExcerptsAdded {
72 buffer: Model<Buffer>,
73 predecessor: ExcerptId,
74 excerpts: Vec<(ExcerptId, ExcerptRange<language::Anchor>)>,
75 },
76 ExcerptsRemoved {
77 ids: Vec<ExcerptId>,
78 },
79 ExcerptsEdited {
80 ids: Vec<ExcerptId>,
81 },
82 Edited {
83 singleton_buffer_edited: bool,
84 },
85 TransactionUndone {
86 transaction_id: TransactionId,
87 },
88 Reloaded,
89 DiffBaseChanged,
90 DiffUpdated {
91 buffer: Model<Buffer>,
92 },
93 LanguageChanged,
94 CapabilityChanged,
95 Reparsed,
96 Saved,
97 FileHandleChanged,
98 Closed,
99 DirtyChanged,
100 DiagnosticsUpdated,
101}
102
103#[derive(Clone)]
104struct History {
105 next_transaction_id: TransactionId,
106 undo_stack: Vec<Transaction>,
107 redo_stack: Vec<Transaction>,
108 transaction_depth: usize,
109 group_interval: Duration,
110}
111
112#[derive(Clone)]
113struct Transaction {
114 id: TransactionId,
115 buffer_transactions: HashMap<BufferId, text::TransactionId>,
116 first_edit_at: Instant,
117 last_edit_at: Instant,
118 suppress_grouping: bool,
119}
120
121pub trait ToOffset: 'static + fmt::Debug {
122 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
123}
124
125pub trait ToOffsetUtf16: 'static + fmt::Debug {
126 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16;
127}
128
129pub trait ToPoint: 'static + fmt::Debug {
130 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
131}
132
133pub trait ToPointUtf16: 'static + fmt::Debug {
134 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
135}
136
137struct BufferState {
138 buffer: Model<Buffer>,
139 last_version: clock::Global,
140 last_parse_count: usize,
141 last_selections_update_count: usize,
142 last_diagnostics_update_count: usize,
143 last_file_update_count: usize,
144 last_git_diff_update_count: usize,
145 excerpts: Vec<Locator>,
146 _subscriptions: [gpui::Subscription; 2],
147}
148
149/// The contents of a [`MultiBuffer`] at a single point in time.
150#[derive(Clone, Default)]
151pub struct MultiBufferSnapshot {
152 singleton: bool,
153 excerpts: SumTree<Excerpt>,
154 excerpt_ids: SumTree<ExcerptIdMapping>,
155 parse_count: usize,
156 diagnostics_update_count: usize,
157 trailing_excerpt_update_count: usize,
158 git_diff_update_count: usize,
159 edit_count: usize,
160 is_dirty: bool,
161 has_conflict: bool,
162 show_headers: bool,
163}
164
165/// A boundary between [`Excerpt`]s in a [`MultiBuffer`]
166pub struct ExcerptBoundary {
167 pub id: ExcerptId,
168 /// The row in the `MultiBuffer` where the boundary is located
169 pub row: u32,
170 pub buffer: BufferSnapshot,
171 pub range: ExcerptRange<text::Anchor>,
172 /// It's possible to have multiple excerpts in the same buffer,
173 /// and they are rendered together without a new File header.
174 ///
175 /// This flag indicates that the excerpt is the first one in the buffer.
176 pub starts_new_buffer: bool,
177}
178
179/// A slice into a [`Buffer`] that is being edited in a [`MultiBuffer`].
180#[derive(Clone)]
181struct Excerpt {
182 /// The unique identifier for this excerpt
183 id: ExcerptId,
184 /// The location of the excerpt in the [`MultiBuffer`]
185 locator: Locator,
186 /// The buffer being excerpted
187 buffer_id: BufferId,
188 /// A snapshot of the buffer being excerpted
189 buffer: BufferSnapshot,
190 /// The range of the buffer to be shown in the excerpt
191 range: ExcerptRange<text::Anchor>,
192 /// The last row in the excerpted slice of the buffer
193 max_buffer_row: u32,
194 /// A summary of the text in the excerpt
195 text_summary: TextSummary,
196 has_trailing_newline: bool,
197}
198
199/// A public view into an [`Excerpt`] in a [`MultiBuffer`].
200///
201/// Contains methods for getting the [`Buffer`] of the excerpt,
202/// as well as mapping offsets to/from buffer and multibuffer coordinates.
203#[derive(Clone)]
204pub struct MultiBufferExcerpt<'a> {
205 excerpt: &'a Excerpt,
206 excerpt_offset: usize,
207}
208
209#[derive(Clone, Debug)]
210struct ExcerptIdMapping {
211 id: ExcerptId,
212 locator: Locator,
213}
214
215/// A range of text from a single [`Buffer`], to be shown as an [`Excerpt`].
216/// These ranges are relative to the buffer itself
217#[derive(Clone, Debug, Eq, PartialEq)]
218pub struct ExcerptRange<T> {
219 /// The full range of text to be shown in the excerpt.
220 pub context: Range<T>,
221 /// The primary range of text to be highlighted in the excerpt.
222 /// In a multi-buffer search, this would be the text that matched the search
223 pub primary: Option<Range<T>>,
224}
225
226#[derive(Clone, Debug, Default)]
227struct ExcerptSummary {
228 excerpt_id: ExcerptId,
229 /// The location of the last [`Excerpt`] being summarized
230 excerpt_locator: Locator,
231 /// The maximum row of the [`Excerpt`]s being summarized
232 max_buffer_row: u32,
233 text: TextSummary,
234}
235
236#[derive(Clone)]
237pub struct MultiBufferRows<'a> {
238 buffer_row_range: Range<u32>,
239 excerpts: Cursor<'a, Excerpt, Point>,
240}
241
242pub struct MultiBufferChunks<'a> {
243 range: Range<usize>,
244 excerpts: Cursor<'a, Excerpt, usize>,
245 excerpt_chunks: Option<ExcerptChunks<'a>>,
246 language_aware: bool,
247}
248
249pub struct MultiBufferBytes<'a> {
250 range: Range<usize>,
251 excerpts: Cursor<'a, Excerpt, usize>,
252 excerpt_bytes: Option<ExcerptBytes<'a>>,
253 chunk: &'a [u8],
254}
255
256pub struct ReversedMultiBufferBytes<'a> {
257 range: Range<usize>,
258 excerpts: Cursor<'a, Excerpt, usize>,
259 excerpt_bytes: Option<ExcerptBytes<'a>>,
260 chunk: &'a [u8],
261}
262
263struct ExcerptChunks<'a> {
264 content_chunks: BufferChunks<'a>,
265 footer_height: usize,
266}
267
268struct ExcerptBytes<'a> {
269 content_bytes: text::Bytes<'a>,
270 padding_height: usize,
271 reversed: bool,
272}
273
274impl MultiBuffer {
275 pub fn new(replica_id: ReplicaId, capability: Capability) -> Self {
276 Self {
277 snapshot: RefCell::new(MultiBufferSnapshot {
278 show_headers: true,
279 ..MultiBufferSnapshot::default()
280 }),
281 buffers: RefCell::default(),
282 subscriptions: Topic::default(),
283 singleton: false,
284 capability,
285 replica_id,
286 title: None,
287 history: History {
288 next_transaction_id: clock::Lamport::default(),
289 undo_stack: Vec::new(),
290 redo_stack: Vec::new(),
291 transaction_depth: 0,
292 group_interval: Duration::from_millis(300),
293 },
294 }
295 }
296
297 pub fn without_headers(replica_id: ReplicaId, capability: Capability) -> Self {
298 Self {
299 snapshot: Default::default(),
300 buffers: Default::default(),
301 subscriptions: Default::default(),
302 singleton: false,
303 capability,
304 replica_id,
305 history: History {
306 next_transaction_id: Default::default(),
307 undo_stack: Default::default(),
308 redo_stack: Default::default(),
309 transaction_depth: 0,
310 group_interval: Duration::from_millis(300),
311 },
312 title: Default::default(),
313 }
314 }
315
316 pub fn clone(&self, new_cx: &mut ModelContext<Self>) -> Self {
317 let mut buffers = HashMap::default();
318 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
319 buffers.insert(
320 *buffer_id,
321 BufferState {
322 buffer: buffer_state.buffer.clone(),
323 last_version: buffer_state.last_version.clone(),
324 last_parse_count: buffer_state.last_parse_count,
325 last_selections_update_count: buffer_state.last_selections_update_count,
326 last_diagnostics_update_count: buffer_state.last_diagnostics_update_count,
327 last_file_update_count: buffer_state.last_file_update_count,
328 last_git_diff_update_count: buffer_state.last_git_diff_update_count,
329 excerpts: buffer_state.excerpts.clone(),
330 _subscriptions: [
331 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
332 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
333 ],
334 },
335 );
336 }
337 Self {
338 snapshot: RefCell::new(self.snapshot.borrow().clone()),
339 buffers: RefCell::new(buffers),
340 subscriptions: Default::default(),
341 singleton: self.singleton,
342 capability: self.capability,
343 replica_id: self.replica_id,
344 history: self.history.clone(),
345 title: self.title.clone(),
346 }
347 }
348
349 pub fn with_title(mut self, title: String) -> Self {
350 self.title = Some(title);
351 self
352 }
353
354 pub fn read_only(&self) -> bool {
355 self.capability == Capability::ReadOnly
356 }
357
358 pub fn singleton(buffer: Model<Buffer>, cx: &mut ModelContext<Self>) -> Self {
359 let mut this = Self::new(buffer.read(cx).replica_id(), buffer.read(cx).capability());
360 this.singleton = true;
361 this.push_excerpts(
362 buffer,
363 [ExcerptRange {
364 context: text::Anchor::MIN..text::Anchor::MAX,
365 primary: None,
366 }],
367 cx,
368 );
369 this.snapshot.borrow_mut().singleton = true;
370 this
371 }
372
373 pub fn replica_id(&self) -> ReplicaId {
374 self.replica_id
375 }
376
377 /// Returns an up-to-date snapshot of the MultiBuffer.
378 pub fn snapshot(&self, cx: &AppContext) -> MultiBufferSnapshot {
379 self.sync(cx);
380 self.snapshot.borrow().clone()
381 }
382
383 pub fn read(&self, cx: &AppContext) -> Ref<MultiBufferSnapshot> {
384 self.sync(cx);
385 self.snapshot.borrow()
386 }
387
388 pub fn as_singleton(&self) -> Option<Model<Buffer>> {
389 if self.singleton {
390 return Some(
391 self.buffers
392 .borrow()
393 .values()
394 .next()
395 .unwrap()
396 .buffer
397 .clone(),
398 );
399 } else {
400 None
401 }
402 }
403
404 pub fn is_singleton(&self) -> bool {
405 self.singleton
406 }
407
408 pub fn subscribe(&mut self) -> Subscription {
409 self.subscriptions.subscribe()
410 }
411
412 pub fn is_dirty(&self, cx: &AppContext) -> bool {
413 self.read(cx).is_dirty()
414 }
415
416 pub fn has_conflict(&self, cx: &AppContext) -> bool {
417 self.read(cx).has_conflict()
418 }
419
420 // The `is_empty` signature doesn't match what clippy expects
421 #[allow(clippy::len_without_is_empty)]
422 pub fn len(&self, cx: &AppContext) -> usize {
423 self.read(cx).len()
424 }
425
426 pub fn is_empty(&self, cx: &AppContext) -> bool {
427 self.len(cx) != 0
428 }
429
430 pub fn symbols_containing<T: ToOffset>(
431 &self,
432 offset: T,
433 theme: Option<&SyntaxTheme>,
434 cx: &AppContext,
435 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
436 self.read(cx).symbols_containing(offset, theme)
437 }
438
439 pub fn edit<I, S, T>(
440 &mut self,
441 edits: I,
442 mut autoindent_mode: Option<AutoindentMode>,
443 cx: &mut ModelContext<Self>,
444 ) where
445 I: IntoIterator<Item = (Range<S>, T)>,
446 S: ToOffset,
447 T: Into<Arc<str>>,
448 {
449 if self.read_only() {
450 return;
451 }
452 if self.buffers.borrow().is_empty() {
453 return;
454 }
455
456 let snapshot = self.read(cx);
457 let edits = edits.into_iter().map(|(range, new_text)| {
458 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
459 if range.start > range.end {
460 mem::swap(&mut range.start, &mut range.end);
461 }
462 (range, new_text)
463 });
464
465 if let Some(buffer) = self.as_singleton() {
466 return buffer.update(cx, |buffer, cx| {
467 buffer.edit(edits, autoindent_mode, cx);
468 });
469 }
470
471 let original_indent_columns = match &mut autoindent_mode {
472 Some(AutoindentMode::Block {
473 original_indent_columns,
474 }) => mem::take(original_indent_columns),
475 _ => Default::default(),
476 };
477
478 struct BufferEdit {
479 range: Range<usize>,
480 new_text: Arc<str>,
481 is_insertion: bool,
482 original_indent_column: u32,
483 }
484 let mut buffer_edits: HashMap<BufferId, Vec<BufferEdit>> = Default::default();
485 let mut edited_excerpt_ids = Vec::new();
486 let mut cursor = snapshot.excerpts.cursor::<usize>();
487 for (ix, (range, new_text)) in edits.enumerate() {
488 let new_text: Arc<str> = new_text.into();
489 let original_indent_column = original_indent_columns.get(ix).copied().unwrap_or(0);
490 cursor.seek(&range.start, Bias::Right, &());
491 if cursor.item().is_none() && range.start == *cursor.start() {
492 cursor.prev(&());
493 }
494 let start_excerpt = cursor.item().expect("start offset out of bounds");
495 let start_overshoot = range.start - cursor.start();
496 let buffer_start = start_excerpt
497 .range
498 .context
499 .start
500 .to_offset(&start_excerpt.buffer)
501 + start_overshoot;
502 edited_excerpt_ids.push(start_excerpt.id);
503
504 cursor.seek(&range.end, Bias::Right, &());
505 if cursor.item().is_none() && range.end == *cursor.start() {
506 cursor.prev(&());
507 }
508 let end_excerpt = cursor.item().expect("end offset out of bounds");
509 let end_overshoot = range.end - cursor.start();
510 let buffer_end = end_excerpt
511 .range
512 .context
513 .start
514 .to_offset(&end_excerpt.buffer)
515 + end_overshoot;
516
517 if start_excerpt.id == end_excerpt.id {
518 buffer_edits
519 .entry(start_excerpt.buffer_id)
520 .or_insert(Vec::new())
521 .push(BufferEdit {
522 range: buffer_start..buffer_end,
523 new_text,
524 is_insertion: true,
525 original_indent_column,
526 });
527 } else {
528 edited_excerpt_ids.push(end_excerpt.id);
529 let start_excerpt_range = buffer_start
530 ..start_excerpt
531 .range
532 .context
533 .end
534 .to_offset(&start_excerpt.buffer);
535 let end_excerpt_range = end_excerpt
536 .range
537 .context
538 .start
539 .to_offset(&end_excerpt.buffer)
540 ..buffer_end;
541 buffer_edits
542 .entry(start_excerpt.buffer_id)
543 .or_insert(Vec::new())
544 .push(BufferEdit {
545 range: start_excerpt_range,
546 new_text: new_text.clone(),
547 is_insertion: true,
548 original_indent_column,
549 });
550 buffer_edits
551 .entry(end_excerpt.buffer_id)
552 .or_insert(Vec::new())
553 .push(BufferEdit {
554 range: end_excerpt_range,
555 new_text: new_text.clone(),
556 is_insertion: false,
557 original_indent_column,
558 });
559
560 cursor.seek(&range.start, Bias::Right, &());
561 cursor.next(&());
562 while let Some(excerpt) = cursor.item() {
563 if excerpt.id == end_excerpt.id {
564 break;
565 }
566 buffer_edits
567 .entry(excerpt.buffer_id)
568 .or_insert(Vec::new())
569 .push(BufferEdit {
570 range: excerpt.range.context.to_offset(&excerpt.buffer),
571 new_text: new_text.clone(),
572 is_insertion: false,
573 original_indent_column,
574 });
575 edited_excerpt_ids.push(excerpt.id);
576 cursor.next(&());
577 }
578 }
579 }
580
581 drop(cursor);
582 drop(snapshot);
583 // Non-generic part of edit, hoisted out to avoid blowing up LLVM IR.
584 fn tail(
585 this: &mut MultiBuffer,
586 buffer_edits: HashMap<BufferId, Vec<BufferEdit>>,
587 autoindent_mode: Option<AutoindentMode>,
588 edited_excerpt_ids: Vec<ExcerptId>,
589 cx: &mut ModelContext<MultiBuffer>,
590 ) {
591 for (buffer_id, mut edits) in buffer_edits {
592 edits.sort_unstable_by_key(|edit| edit.range.start);
593 this.buffers.borrow()[&buffer_id]
594 .buffer
595 .update(cx, |buffer, cx| {
596 let mut edits = edits.into_iter().peekable();
597 let mut insertions = Vec::new();
598 let mut original_indent_columns = Vec::new();
599 let mut deletions = Vec::new();
600 let empty_str: Arc<str> = "".into();
601 while let Some(BufferEdit {
602 mut range,
603 new_text,
604 mut is_insertion,
605 original_indent_column,
606 }) = edits.next()
607 {
608 while let Some(BufferEdit {
609 range: next_range,
610 is_insertion: next_is_insertion,
611 ..
612 }) = edits.peek()
613 {
614 if range.end >= next_range.start {
615 range.end = cmp::max(next_range.end, range.end);
616 is_insertion |= *next_is_insertion;
617 edits.next();
618 } else {
619 break;
620 }
621 }
622
623 if is_insertion {
624 original_indent_columns.push(original_indent_column);
625 insertions.push((
626 buffer.anchor_before(range.start)
627 ..buffer.anchor_before(range.end),
628 new_text.clone(),
629 ));
630 } else if !range.is_empty() {
631 deletions.push((
632 buffer.anchor_before(range.start)
633 ..buffer.anchor_before(range.end),
634 empty_str.clone(),
635 ));
636 }
637 }
638
639 let deletion_autoindent_mode =
640 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
641 Some(AutoindentMode::Block {
642 original_indent_columns: Default::default(),
643 })
644 } else {
645 None
646 };
647 let insertion_autoindent_mode =
648 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
649 Some(AutoindentMode::Block {
650 original_indent_columns,
651 })
652 } else {
653 None
654 };
655
656 buffer.edit(deletions, deletion_autoindent_mode, cx);
657 buffer.edit(insertions, insertion_autoindent_mode, cx);
658 })
659 }
660
661 cx.emit(Event::ExcerptsEdited {
662 ids: edited_excerpt_ids,
663 });
664 }
665 tail(self, buffer_edits, autoindent_mode, edited_excerpt_ids, cx);
666 }
667
668 pub fn start_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
669 self.start_transaction_at(Instant::now(), cx)
670 }
671
672 pub fn start_transaction_at(
673 &mut self,
674 now: Instant,
675 cx: &mut ModelContext<Self>,
676 ) -> Option<TransactionId> {
677 if let Some(buffer) = self.as_singleton() {
678 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
679 }
680
681 for BufferState { buffer, .. } in self.buffers.borrow().values() {
682 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
683 }
684 self.history.start_transaction(now)
685 }
686
687 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
688 self.end_transaction_at(Instant::now(), cx)
689 }
690
691 pub fn end_transaction_at(
692 &mut self,
693 now: Instant,
694 cx: &mut ModelContext<Self>,
695 ) -> Option<TransactionId> {
696 if let Some(buffer) = self.as_singleton() {
697 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
698 }
699
700 let mut buffer_transactions = HashMap::default();
701 for BufferState { buffer, .. } in self.buffers.borrow().values() {
702 if let Some(transaction_id) =
703 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
704 {
705 buffer_transactions.insert(buffer.read(cx).remote_id(), transaction_id);
706 }
707 }
708
709 if self.history.end_transaction(now, buffer_transactions) {
710 let transaction_id = self.history.group().unwrap();
711 Some(transaction_id)
712 } else {
713 None
714 }
715 }
716
717 pub fn merge_transactions(
718 &mut self,
719 transaction: TransactionId,
720 destination: TransactionId,
721 cx: &mut ModelContext<Self>,
722 ) {
723 if let Some(buffer) = self.as_singleton() {
724 buffer.update(cx, |buffer, _| {
725 buffer.merge_transactions(transaction, destination)
726 });
727 } else {
728 if let Some(transaction) = self.history.forget(transaction) {
729 if let Some(destination) = self.history.transaction_mut(destination) {
730 for (buffer_id, buffer_transaction_id) in transaction.buffer_transactions {
731 if let Some(destination_buffer_transaction_id) =
732 destination.buffer_transactions.get(&buffer_id)
733 {
734 if let Some(state) = self.buffers.borrow().get(&buffer_id) {
735 state.buffer.update(cx, |buffer, _| {
736 buffer.merge_transactions(
737 buffer_transaction_id,
738 *destination_buffer_transaction_id,
739 )
740 });
741 }
742 } else {
743 destination
744 .buffer_transactions
745 .insert(buffer_id, buffer_transaction_id);
746 }
747 }
748 }
749 }
750 }
751 }
752
753 pub fn finalize_last_transaction(&mut self, cx: &mut ModelContext<Self>) {
754 self.history.finalize_last_transaction();
755 for BufferState { buffer, .. } in self.buffers.borrow().values() {
756 buffer.update(cx, |buffer, _| {
757 buffer.finalize_last_transaction();
758 });
759 }
760 }
761
762 pub fn push_transaction<'a, T>(&mut self, buffer_transactions: T, cx: &mut ModelContext<Self>)
763 where
764 T: IntoIterator<Item = (&'a Model<Buffer>, &'a language::Transaction)>,
765 {
766 self.history
767 .push_transaction(buffer_transactions, Instant::now(), cx);
768 self.history.finalize_last_transaction();
769 }
770
771 pub fn group_until_transaction(
772 &mut self,
773 transaction_id: TransactionId,
774 cx: &mut ModelContext<Self>,
775 ) {
776 if let Some(buffer) = self.as_singleton() {
777 buffer.update(cx, |buffer, _| {
778 buffer.group_until_transaction(transaction_id)
779 });
780 } else {
781 self.history.group_until(transaction_id);
782 }
783 }
784
785 pub fn set_active_selections(
786 &mut self,
787 selections: &[Selection<Anchor>],
788 line_mode: bool,
789 cursor_shape: CursorShape,
790 cx: &mut ModelContext<Self>,
791 ) {
792 let mut selections_by_buffer: HashMap<BufferId, Vec<Selection<text::Anchor>>> =
793 Default::default();
794 let snapshot = self.read(cx);
795 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
796 for selection in selections {
797 let start_locator = snapshot.excerpt_locator_for_id(selection.start.excerpt_id);
798 let end_locator = snapshot.excerpt_locator_for_id(selection.end.excerpt_id);
799
800 cursor.seek(&Some(start_locator), Bias::Left, &());
801 while let Some(excerpt) = cursor.item() {
802 if excerpt.locator > *end_locator {
803 break;
804 }
805
806 let mut start = excerpt.range.context.start;
807 let mut end = excerpt.range.context.end;
808 if excerpt.id == selection.start.excerpt_id {
809 start = selection.start.text_anchor;
810 }
811 if excerpt.id == selection.end.excerpt_id {
812 end = selection.end.text_anchor;
813 }
814 selections_by_buffer
815 .entry(excerpt.buffer_id)
816 .or_default()
817 .push(Selection {
818 id: selection.id,
819 start,
820 end,
821 reversed: selection.reversed,
822 goal: selection.goal,
823 });
824
825 cursor.next(&());
826 }
827 }
828
829 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
830 if !selections_by_buffer.contains_key(buffer_id) {
831 buffer_state
832 .buffer
833 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
834 }
835 }
836
837 for (buffer_id, mut selections) in selections_by_buffer {
838 self.buffers.borrow()[&buffer_id]
839 .buffer
840 .update(cx, |buffer, cx| {
841 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer));
842 let mut selections = selections.into_iter().peekable();
843 let merged_selections = Arc::from_iter(iter::from_fn(|| {
844 let mut selection = selections.next()?;
845 while let Some(next_selection) = selections.peek() {
846 if selection.end.cmp(&next_selection.start, buffer).is_ge() {
847 let next_selection = selections.next().unwrap();
848 if next_selection.end.cmp(&selection.end, buffer).is_ge() {
849 selection.end = next_selection.end;
850 }
851 } else {
852 break;
853 }
854 }
855 Some(selection)
856 }));
857 buffer.set_active_selections(merged_selections, line_mode, cursor_shape, cx);
858 });
859 }
860 }
861
862 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
863 for buffer in self.buffers.borrow().values() {
864 buffer
865 .buffer
866 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
867 }
868 }
869
870 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
871 let mut transaction_id = None;
872 if let Some(buffer) = self.as_singleton() {
873 transaction_id = buffer.update(cx, |buffer, cx| buffer.undo(cx));
874 } else {
875 while let Some(transaction) = self.history.pop_undo() {
876 let mut undone = false;
877 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
878 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
879 undone |= buffer.update(cx, |buffer, cx| {
880 let undo_to = *buffer_transaction_id;
881 if let Some(entry) = buffer.peek_undo_stack() {
882 *buffer_transaction_id = entry.transaction_id();
883 }
884 buffer.undo_to_transaction(undo_to, cx)
885 });
886 }
887 }
888
889 if undone {
890 transaction_id = Some(transaction.id);
891 break;
892 }
893 }
894 }
895
896 if let Some(transaction_id) = transaction_id {
897 cx.emit(Event::TransactionUndone { transaction_id });
898 }
899
900 transaction_id
901 }
902
903 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
904 if let Some(buffer) = self.as_singleton() {
905 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
906 }
907
908 while let Some(transaction) = self.history.pop_redo() {
909 let mut redone = false;
910 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
911 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
912 redone |= buffer.update(cx, |buffer, cx| {
913 let redo_to = *buffer_transaction_id;
914 if let Some(entry) = buffer.peek_redo_stack() {
915 *buffer_transaction_id = entry.transaction_id();
916 }
917 buffer.redo_to_transaction(redo_to, cx)
918 });
919 }
920 }
921
922 if redone {
923 return Some(transaction.id);
924 }
925 }
926
927 None
928 }
929
930 pub fn undo_transaction(&mut self, transaction_id: TransactionId, cx: &mut ModelContext<Self>) {
931 if let Some(buffer) = self.as_singleton() {
932 buffer.update(cx, |buffer, cx| buffer.undo_transaction(transaction_id, cx));
933 } else if let Some(transaction) = self.history.remove_from_undo(transaction_id) {
934 for (buffer_id, transaction_id) in &transaction.buffer_transactions {
935 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
936 buffer.update(cx, |buffer, cx| {
937 buffer.undo_transaction(*transaction_id, cx)
938 });
939 }
940 }
941 }
942 }
943
944 pub fn stream_excerpts_with_context_lines(
945 &mut self,
946 buffer: Model<Buffer>,
947 ranges: Vec<Range<text::Anchor>>,
948 context_line_count: u32,
949 cx: &mut ModelContext<Self>,
950 ) -> mpsc::Receiver<Range<Anchor>> {
951 let (buffer_id, buffer_snapshot) =
952 buffer.update(cx, |buffer, _| (buffer.remote_id(), buffer.snapshot()));
953
954 let (mut tx, rx) = mpsc::channel(256);
955 cx.spawn(move |this, mut cx| async move {
956 let mut excerpt_ranges = Vec::new();
957 let mut range_counts = Vec::new();
958 cx.background_executor()
959 .scoped(|scope| {
960 scope.spawn(async {
961 let (ranges, counts) =
962 build_excerpt_ranges(&buffer_snapshot, &ranges, context_line_count);
963 excerpt_ranges = ranges;
964 range_counts = counts;
965 });
966 })
967 .await;
968
969 let mut ranges = ranges.into_iter();
970 let mut range_counts = range_counts.into_iter();
971 for excerpt_ranges in excerpt_ranges.chunks(100) {
972 let excerpt_ids = match this.update(&mut cx, |this, cx| {
973 this.push_excerpts(buffer.clone(), excerpt_ranges.iter().cloned(), cx)
974 }) {
975 Ok(excerpt_ids) => excerpt_ids,
976 Err(_) => return,
977 };
978
979 for (excerpt_id, range_count) in excerpt_ids.into_iter().zip(range_counts.by_ref())
980 {
981 for range in ranges.by_ref().take(range_count) {
982 let start = Anchor {
983 buffer_id: Some(buffer_id),
984 excerpt_id: excerpt_id,
985 text_anchor: range.start,
986 };
987 let end = Anchor {
988 buffer_id: Some(buffer_id),
989 excerpt_id: excerpt_id,
990 text_anchor: range.end,
991 };
992 if tx.send(start..end).await.is_err() {
993 break;
994 }
995 }
996 }
997 }
998 })
999 .detach();
1000
1001 rx
1002 }
1003
1004 pub fn push_excerpts<O>(
1005 &mut self,
1006 buffer: Model<Buffer>,
1007 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1008 cx: &mut ModelContext<Self>,
1009 ) -> Vec<ExcerptId>
1010 where
1011 O: text::ToOffset,
1012 {
1013 self.insert_excerpts_after(ExcerptId::max(), buffer, ranges, cx)
1014 }
1015
1016 pub fn push_excerpts_with_context_lines<O>(
1017 &mut self,
1018 buffer: Model<Buffer>,
1019 ranges: Vec<Range<O>>,
1020 context_line_count: u32,
1021 cx: &mut ModelContext<Self>,
1022 ) -> Vec<Range<Anchor>>
1023 where
1024 O: text::ToPoint + text::ToOffset,
1025 {
1026 let buffer_id = buffer.read(cx).remote_id();
1027 let buffer_snapshot = buffer.read(cx).snapshot();
1028 let (excerpt_ranges, range_counts) =
1029 build_excerpt_ranges(&buffer_snapshot, &ranges, context_line_count);
1030
1031 let excerpt_ids = self.push_excerpts(buffer, excerpt_ranges, cx);
1032
1033 let mut anchor_ranges = Vec::new();
1034 let mut ranges = ranges.into_iter();
1035 for (excerpt_id, range_count) in excerpt_ids.into_iter().zip(range_counts.into_iter()) {
1036 anchor_ranges.extend(ranges.by_ref().take(range_count).map(|range| {
1037 let start = Anchor {
1038 buffer_id: Some(buffer_id),
1039 excerpt_id,
1040 text_anchor: buffer_snapshot.anchor_after(range.start),
1041 };
1042 let end = Anchor {
1043 buffer_id: Some(buffer_id),
1044 excerpt_id,
1045 text_anchor: buffer_snapshot.anchor_after(range.end),
1046 };
1047 start..end
1048 }))
1049 }
1050 anchor_ranges
1051 }
1052
1053 pub fn insert_excerpts_after<O>(
1054 &mut self,
1055 prev_excerpt_id: ExcerptId,
1056 buffer: Model<Buffer>,
1057 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1058 cx: &mut ModelContext<Self>,
1059 ) -> Vec<ExcerptId>
1060 where
1061 O: text::ToOffset,
1062 {
1063 let mut ids = Vec::new();
1064 let mut next_excerpt_id =
1065 if let Some(last_entry) = self.snapshot.borrow().excerpt_ids.last() {
1066 last_entry.id.0 + 1
1067 } else {
1068 1
1069 };
1070 self.insert_excerpts_with_ids_after(
1071 prev_excerpt_id,
1072 buffer,
1073 ranges.into_iter().map(|range| {
1074 let id = ExcerptId(post_inc(&mut next_excerpt_id));
1075 ids.push(id);
1076 (id, range)
1077 }),
1078 cx,
1079 );
1080 ids
1081 }
1082
1083 pub fn insert_excerpts_with_ids_after<O>(
1084 &mut self,
1085 prev_excerpt_id: ExcerptId,
1086 buffer: Model<Buffer>,
1087 ranges: impl IntoIterator<Item = (ExcerptId, ExcerptRange<O>)>,
1088 cx: &mut ModelContext<Self>,
1089 ) where
1090 O: text::ToOffset,
1091 {
1092 assert_eq!(self.history.transaction_depth, 0);
1093 let mut ranges = ranges.into_iter().peekable();
1094 if ranges.peek().is_none() {
1095 return Default::default();
1096 }
1097
1098 self.sync(cx);
1099
1100 let buffer_id = buffer.read(cx).remote_id();
1101 let buffer_snapshot = buffer.read(cx).snapshot();
1102
1103 let mut buffers = self.buffers.borrow_mut();
1104 let buffer_state = buffers.entry(buffer_id).or_insert_with(|| BufferState {
1105 last_version: buffer_snapshot.version().clone(),
1106 last_parse_count: buffer_snapshot.parse_count(),
1107 last_selections_update_count: buffer_snapshot.selections_update_count(),
1108 last_diagnostics_update_count: buffer_snapshot.diagnostics_update_count(),
1109 last_file_update_count: buffer_snapshot.file_update_count(),
1110 last_git_diff_update_count: buffer_snapshot.git_diff_update_count(),
1111 excerpts: Default::default(),
1112 _subscriptions: [
1113 cx.observe(&buffer, |_, _, cx| cx.notify()),
1114 cx.subscribe(&buffer, Self::on_buffer_event),
1115 ],
1116 buffer: buffer.clone(),
1117 });
1118
1119 let mut snapshot = self.snapshot.borrow_mut();
1120
1121 let mut prev_locator = snapshot.excerpt_locator_for_id(prev_excerpt_id).clone();
1122 let mut new_excerpt_ids = mem::take(&mut snapshot.excerpt_ids);
1123 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
1124 let mut new_excerpts = cursor.slice(&prev_locator, Bias::Right, &());
1125 prev_locator = cursor.start().unwrap_or(Locator::min_ref()).clone();
1126
1127 let edit_start = new_excerpts.summary().text.len;
1128 new_excerpts.update_last(
1129 |excerpt| {
1130 excerpt.has_trailing_newline = true;
1131 },
1132 &(),
1133 );
1134
1135 let next_locator = if let Some(excerpt) = cursor.item() {
1136 excerpt.locator.clone()
1137 } else {
1138 Locator::max()
1139 };
1140
1141 let mut excerpts = Vec::new();
1142 while let Some((id, range)) = ranges.next() {
1143 let locator = Locator::between(&prev_locator, &next_locator);
1144 if let Err(ix) = buffer_state.excerpts.binary_search(&locator) {
1145 buffer_state.excerpts.insert(ix, locator.clone());
1146 }
1147 let range = ExcerptRange {
1148 context: buffer_snapshot.anchor_before(&range.context.start)
1149 ..buffer_snapshot.anchor_after(&range.context.end),
1150 primary: range.primary.map(|primary| {
1151 buffer_snapshot.anchor_before(&primary.start)
1152 ..buffer_snapshot.anchor_after(&primary.end)
1153 }),
1154 };
1155 excerpts.push((id, range.clone()));
1156 let excerpt = Excerpt::new(
1157 id,
1158 locator.clone(),
1159 buffer_id,
1160 buffer_snapshot.clone(),
1161 range,
1162 ranges.peek().is_some() || cursor.item().is_some(),
1163 );
1164 new_excerpts.push(excerpt, &());
1165 prev_locator = locator.clone();
1166
1167 if let Some(last_mapping_entry) = new_excerpt_ids.last() {
1168 assert!(id > last_mapping_entry.id, "excerpt ids must be increasing");
1169 }
1170 new_excerpt_ids.push(ExcerptIdMapping { id, locator }, &());
1171 }
1172
1173 let edit_end = new_excerpts.summary().text.len;
1174
1175 let suffix = cursor.suffix(&());
1176 let changed_trailing_excerpt = suffix.is_empty();
1177 new_excerpts.append(suffix, &());
1178 drop(cursor);
1179 snapshot.excerpts = new_excerpts;
1180 snapshot.excerpt_ids = new_excerpt_ids;
1181 if changed_trailing_excerpt {
1182 snapshot.trailing_excerpt_update_count += 1;
1183 }
1184
1185 self.subscriptions.publish_mut([Edit {
1186 old: edit_start..edit_start,
1187 new: edit_start..edit_end,
1188 }]);
1189 cx.emit(Event::Edited {
1190 singleton_buffer_edited: false,
1191 });
1192 cx.emit(Event::ExcerptsAdded {
1193 buffer,
1194 predecessor: prev_excerpt_id,
1195 excerpts,
1196 });
1197 cx.notify();
1198 }
1199
1200 pub fn clear(&mut self, cx: &mut ModelContext<Self>) {
1201 self.sync(cx);
1202 let ids = self.excerpt_ids();
1203 self.buffers.borrow_mut().clear();
1204 let mut snapshot = self.snapshot.borrow_mut();
1205 let prev_len = snapshot.len();
1206 snapshot.excerpts = Default::default();
1207 snapshot.trailing_excerpt_update_count += 1;
1208 snapshot.is_dirty = false;
1209 snapshot.has_conflict = false;
1210
1211 self.subscriptions.publish_mut([Edit {
1212 old: 0..prev_len,
1213 new: 0..0,
1214 }]);
1215 cx.emit(Event::Edited {
1216 singleton_buffer_edited: false,
1217 });
1218 cx.emit(Event::ExcerptsRemoved { ids });
1219 cx.notify();
1220 }
1221
1222 pub fn excerpts_for_buffer(
1223 &self,
1224 buffer: &Model<Buffer>,
1225 cx: &AppContext,
1226 ) -> Vec<(ExcerptId, ExcerptRange<text::Anchor>)> {
1227 let mut excerpts = Vec::new();
1228 let snapshot = self.read(cx);
1229 let buffers = self.buffers.borrow();
1230 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
1231 for locator in buffers
1232 .get(&buffer.read(cx).remote_id())
1233 .map(|state| &state.excerpts)
1234 .into_iter()
1235 .flatten()
1236 {
1237 cursor.seek_forward(&Some(locator), Bias::Left, &());
1238 if let Some(excerpt) = cursor.item() {
1239 if excerpt.locator == *locator {
1240 excerpts.push((excerpt.id, excerpt.range.clone()));
1241 }
1242 }
1243 }
1244
1245 excerpts
1246 }
1247
1248 pub fn excerpt_ids(&self) -> Vec<ExcerptId> {
1249 self.snapshot
1250 .borrow()
1251 .excerpts
1252 .iter()
1253 .map(|entry| entry.id)
1254 .collect()
1255 }
1256
1257 pub fn excerpt_containing(
1258 &self,
1259 position: impl ToOffset,
1260 cx: &AppContext,
1261 ) -> Option<(ExcerptId, Model<Buffer>, Range<text::Anchor>)> {
1262 let snapshot = self.read(cx);
1263 let position = position.to_offset(&snapshot);
1264
1265 let mut cursor = snapshot.excerpts.cursor::<usize>();
1266 cursor.seek(&position, Bias::Right, &());
1267 cursor
1268 .item()
1269 .or_else(|| snapshot.excerpts.last())
1270 .map(|excerpt| {
1271 (
1272 excerpt.id,
1273 self.buffers
1274 .borrow()
1275 .get(&excerpt.buffer_id)
1276 .unwrap()
1277 .buffer
1278 .clone(),
1279 excerpt.range.context.clone(),
1280 )
1281 })
1282 }
1283
1284 // If point is at the end of the buffer, the last excerpt is returned
1285 pub fn point_to_buffer_offset<T: ToOffset>(
1286 &self,
1287 point: T,
1288 cx: &AppContext,
1289 ) -> Option<(Model<Buffer>, usize, ExcerptId)> {
1290 let snapshot = self.read(cx);
1291 let offset = point.to_offset(&snapshot);
1292 let mut cursor = snapshot.excerpts.cursor::<usize>();
1293 cursor.seek(&offset, Bias::Right, &());
1294 if cursor.item().is_none() {
1295 cursor.prev(&());
1296 }
1297
1298 cursor.item().map(|excerpt| {
1299 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1300 let buffer_point = excerpt_start + offset - *cursor.start();
1301 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
1302
1303 (buffer, buffer_point, excerpt.id)
1304 })
1305 }
1306
1307 pub fn range_to_buffer_ranges<T: ToOffset>(
1308 &self,
1309 range: Range<T>,
1310 cx: &AppContext,
1311 ) -> Vec<(Model<Buffer>, Range<usize>, ExcerptId)> {
1312 let snapshot = self.read(cx);
1313 let start = range.start.to_offset(&snapshot);
1314 let end = range.end.to_offset(&snapshot);
1315
1316 let mut result = Vec::new();
1317 let mut cursor = snapshot.excerpts.cursor::<usize>();
1318 cursor.seek(&start, Bias::Right, &());
1319 if cursor.item().is_none() {
1320 cursor.prev(&());
1321 }
1322
1323 while let Some(excerpt) = cursor.item() {
1324 if *cursor.start() > end {
1325 break;
1326 }
1327
1328 let mut end_before_newline = cursor.end(&());
1329 if excerpt.has_trailing_newline {
1330 end_before_newline -= 1;
1331 }
1332 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1333 let start = excerpt_start + (cmp::max(start, *cursor.start()) - *cursor.start());
1334 let end = excerpt_start + (cmp::min(end, end_before_newline) - *cursor.start());
1335 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
1336 result.push((buffer, start..end, excerpt.id));
1337 cursor.next(&());
1338 }
1339
1340 result
1341 }
1342
1343 pub fn remove_excerpts(
1344 &mut self,
1345 excerpt_ids: impl IntoIterator<Item = ExcerptId>,
1346 cx: &mut ModelContext<Self>,
1347 ) {
1348 self.sync(cx);
1349 let ids = excerpt_ids.into_iter().collect::<Vec<_>>();
1350 if ids.is_empty() {
1351 return;
1352 }
1353
1354 let mut buffers = self.buffers.borrow_mut();
1355 let mut snapshot = self.snapshot.borrow_mut();
1356 let mut new_excerpts = SumTree::new();
1357 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1358 let mut edits = Vec::new();
1359 let mut excerpt_ids = ids.iter().copied().peekable();
1360
1361 while let Some(excerpt_id) = excerpt_ids.next() {
1362 // Seek to the next excerpt to remove, preserving any preceding excerpts.
1363 let locator = snapshot.excerpt_locator_for_id(excerpt_id);
1364 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left, &()), &());
1365
1366 if let Some(mut excerpt) = cursor.item() {
1367 if excerpt.id != excerpt_id {
1368 continue;
1369 }
1370 let mut old_start = cursor.start().1;
1371
1372 // Skip over the removed excerpt.
1373 'remove_excerpts: loop {
1374 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
1375 buffer_state.excerpts.retain(|l| l != &excerpt.locator);
1376 if buffer_state.excerpts.is_empty() {
1377 buffers.remove(&excerpt.buffer_id);
1378 }
1379 }
1380 cursor.next(&());
1381
1382 // Skip over any subsequent excerpts that are also removed.
1383 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
1384 let next_locator = snapshot.excerpt_locator_for_id(next_excerpt_id);
1385 if let Some(next_excerpt) = cursor.item() {
1386 if next_excerpt.locator == *next_locator {
1387 excerpt_ids.next();
1388 excerpt = next_excerpt;
1389 continue 'remove_excerpts;
1390 }
1391 }
1392 }
1393
1394 break;
1395 }
1396
1397 // When removing the last excerpt, remove the trailing newline from
1398 // the previous excerpt.
1399 if cursor.item().is_none() && old_start > 0 {
1400 old_start -= 1;
1401 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
1402 }
1403
1404 // Push an edit for the removal of this run of excerpts.
1405 let old_end = cursor.start().1;
1406 let new_start = new_excerpts.summary().text.len;
1407 edits.push(Edit {
1408 old: old_start..old_end,
1409 new: new_start..new_start,
1410 });
1411 }
1412 }
1413 let suffix = cursor.suffix(&());
1414 let changed_trailing_excerpt = suffix.is_empty();
1415 new_excerpts.append(suffix, &());
1416 drop(cursor);
1417 snapshot.excerpts = new_excerpts;
1418
1419 if changed_trailing_excerpt {
1420 snapshot.trailing_excerpt_update_count += 1;
1421 }
1422
1423 self.subscriptions.publish_mut(edits);
1424 cx.emit(Event::Edited {
1425 singleton_buffer_edited: false,
1426 });
1427 cx.emit(Event::ExcerptsRemoved { ids });
1428 cx.notify();
1429 }
1430
1431 pub fn wait_for_anchors<'a>(
1432 &self,
1433 anchors: impl 'a + Iterator<Item = Anchor>,
1434 cx: &mut ModelContext<Self>,
1435 ) -> impl 'static + Future<Output = Result<()>> {
1436 let borrow = self.buffers.borrow();
1437 let mut error = None;
1438 let mut futures = Vec::new();
1439 for anchor in anchors {
1440 if let Some(buffer_id) = anchor.buffer_id {
1441 if let Some(buffer) = borrow.get(&buffer_id) {
1442 buffer.buffer.update(cx, |buffer, _| {
1443 futures.push(buffer.wait_for_anchors([anchor.text_anchor]))
1444 });
1445 } else {
1446 error = Some(anyhow!(
1447 "buffer {buffer_id} is not part of this multi-buffer"
1448 ));
1449 break;
1450 }
1451 }
1452 }
1453 async move {
1454 if let Some(error) = error {
1455 Err(error)?;
1456 }
1457 for future in futures {
1458 future.await?;
1459 }
1460 Ok(())
1461 }
1462 }
1463
1464 pub fn text_anchor_for_position<T: ToOffset>(
1465 &self,
1466 position: T,
1467 cx: &AppContext,
1468 ) -> Option<(Model<Buffer>, language::Anchor)> {
1469 let snapshot = self.read(cx);
1470 let anchor = snapshot.anchor_before(position);
1471 let buffer = self
1472 .buffers
1473 .borrow()
1474 .get(&anchor.buffer_id?)?
1475 .buffer
1476 .clone();
1477 Some((buffer, anchor.text_anchor))
1478 }
1479
1480 fn on_buffer_event(
1481 &mut self,
1482 buffer: Model<Buffer>,
1483 event: &language::Event,
1484 cx: &mut ModelContext<Self>,
1485 ) {
1486 cx.emit(match event {
1487 language::Event::Edited => Event::Edited {
1488 singleton_buffer_edited: true,
1489 },
1490 language::Event::DirtyChanged => Event::DirtyChanged,
1491 language::Event::Saved => Event::Saved,
1492 language::Event::FileHandleChanged => Event::FileHandleChanged,
1493 language::Event::Reloaded => Event::Reloaded,
1494 language::Event::DiffBaseChanged => Event::DiffBaseChanged,
1495 language::Event::DiffUpdated => Event::DiffUpdated { buffer },
1496 language::Event::LanguageChanged => Event::LanguageChanged,
1497 language::Event::Reparsed => Event::Reparsed,
1498 language::Event::DiagnosticsUpdated => Event::DiagnosticsUpdated,
1499 language::Event::Closed => Event::Closed,
1500 language::Event::CapabilityChanged => {
1501 self.capability = buffer.read(cx).capability();
1502 Event::CapabilityChanged
1503 }
1504
1505 //
1506 language::Event::Operation(_) => return,
1507 });
1508 }
1509
1510 pub fn all_buffers(&self) -> HashSet<Model<Buffer>> {
1511 self.buffers
1512 .borrow()
1513 .values()
1514 .map(|state| state.buffer.clone())
1515 .collect()
1516 }
1517
1518 pub fn buffer(&self, buffer_id: BufferId) -> Option<Model<Buffer>> {
1519 self.buffers
1520 .borrow()
1521 .get(&buffer_id)
1522 .map(|state| state.buffer.clone())
1523 }
1524
1525 pub fn is_completion_trigger(
1526 &self,
1527 position: Anchor,
1528 text: &str,
1529 trigger_in_words: bool,
1530 cx: &AppContext,
1531 ) -> bool {
1532 let mut chars = text.chars();
1533 let char = if let Some(char) = chars.next() {
1534 char
1535 } else {
1536 return false;
1537 };
1538 if chars.next().is_some() {
1539 return false;
1540 }
1541
1542 let snapshot = self.snapshot(cx);
1543 let position = position.to_offset(&snapshot);
1544 let scope = snapshot.language_scope_at(position);
1545 if trigger_in_words && char_kind(&scope, char) == CharKind::Word {
1546 return true;
1547 }
1548
1549 let anchor = snapshot.anchor_before(position);
1550 anchor
1551 .buffer_id
1552 .and_then(|buffer_id| {
1553 let buffer = self.buffers.borrow().get(&buffer_id)?.buffer.clone();
1554 Some(
1555 buffer
1556 .read(cx)
1557 .completion_triggers()
1558 .iter()
1559 .any(|string| string == text),
1560 )
1561 })
1562 .unwrap_or(false)
1563 }
1564
1565 pub fn language_at<T: ToOffset>(&self, point: T, cx: &AppContext) -> Option<Arc<Language>> {
1566 self.point_to_buffer_offset(point, cx)
1567 .and_then(|(buffer, offset, _)| buffer.read(cx).language_at(offset))
1568 }
1569
1570 pub fn settings_at<'a, T: ToOffset>(
1571 &self,
1572 point: T,
1573 cx: &'a AppContext,
1574 ) -> &'a LanguageSettings {
1575 let mut language = None;
1576 let mut file = None;
1577 if let Some((buffer, offset, _)) = self.point_to_buffer_offset(point, cx) {
1578 let buffer = buffer.read(cx);
1579 language = buffer.language_at(offset);
1580 file = buffer.file();
1581 }
1582 language_settings(language.as_ref(), file, cx)
1583 }
1584
1585 pub fn for_each_buffer(&self, mut f: impl FnMut(&Model<Buffer>)) {
1586 self.buffers
1587 .borrow()
1588 .values()
1589 .for_each(|state| f(&state.buffer))
1590 }
1591
1592 pub fn title<'a>(&'a self, cx: &'a AppContext) -> Cow<'a, str> {
1593 if let Some(title) = self.title.as_ref() {
1594 return title.into();
1595 }
1596
1597 if let Some(buffer) = self.as_singleton() {
1598 if let Some(file) = buffer.read(cx).file() {
1599 return file.file_name(cx).to_string_lossy();
1600 }
1601 }
1602
1603 "untitled".into()
1604 }
1605
1606 pub fn set_title(&mut self, title: String, cx: &mut ModelContext<Self>) {
1607 self.title = Some(title);
1608 cx.notify();
1609 }
1610
1611 #[cfg(any(test, feature = "test-support"))]
1612 pub fn is_parsing(&self, cx: &AppContext) -> bool {
1613 self.as_singleton().unwrap().read(cx).is_parsing()
1614 }
1615
1616 pub fn expand_excerpts(
1617 &mut self,
1618 ids: impl IntoIterator<Item = ExcerptId>,
1619 line_count: u32,
1620 cx: &mut ModelContext<Self>,
1621 ) {
1622 if line_count == 0 {
1623 return;
1624 }
1625 self.sync(cx);
1626
1627 let snapshot = self.snapshot(cx);
1628 let locators = snapshot.excerpt_locators_for_ids(ids);
1629 let mut new_excerpts = SumTree::new();
1630 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1631 let mut edits = Vec::<Edit<usize>>::new();
1632
1633 for locator in &locators {
1634 let prefix = cursor.slice(&Some(locator), Bias::Left, &());
1635 new_excerpts.append(prefix, &());
1636
1637 let mut excerpt = cursor.item().unwrap().clone();
1638 let old_text_len = excerpt.text_summary.len;
1639
1640 let start_row = excerpt
1641 .range
1642 .context
1643 .start
1644 .to_point(&excerpt.buffer)
1645 .row
1646 .saturating_sub(line_count);
1647 let start_point = Point::new(start_row, 0);
1648 excerpt.range.context.start = excerpt.buffer.anchor_before(start_point);
1649
1650 let end_point = excerpt.buffer.clip_point(
1651 excerpt.range.context.end.to_point(&excerpt.buffer) + Point::new(line_count, 0),
1652 Bias::Left,
1653 );
1654 excerpt.range.context.end = excerpt.buffer.anchor_after(end_point);
1655 excerpt.max_buffer_row = end_point.row;
1656
1657 excerpt.text_summary = excerpt
1658 .buffer
1659 .text_summary_for_range(start_point..end_point);
1660
1661 let new_start_offset = new_excerpts.summary().text.len;
1662 let old_start_offset = cursor.start().1;
1663 let edit = Edit {
1664 old: old_start_offset..old_start_offset + old_text_len,
1665 new: new_start_offset..new_start_offset + excerpt.text_summary.len,
1666 };
1667
1668 if let Some(last_edit) = edits.last_mut() {
1669 if last_edit.old.end == edit.old.start {
1670 last_edit.old.end = edit.old.end;
1671 last_edit.new.end = edit.new.end;
1672 } else {
1673 edits.push(edit);
1674 }
1675 } else {
1676 edits.push(edit);
1677 }
1678
1679 new_excerpts.push(excerpt, &());
1680
1681 cursor.next(&());
1682 }
1683
1684 new_excerpts.append(cursor.suffix(&()), &());
1685
1686 drop(cursor);
1687 self.snapshot.borrow_mut().excerpts = new_excerpts;
1688
1689 self.subscriptions.publish_mut(edits);
1690 cx.emit(Event::Edited {
1691 singleton_buffer_edited: false,
1692 });
1693 cx.notify();
1694 }
1695
1696 fn sync(&self, cx: &AppContext) {
1697 let mut snapshot = self.snapshot.borrow_mut();
1698 let mut excerpts_to_edit = Vec::new();
1699 let mut reparsed = false;
1700 let mut diagnostics_updated = false;
1701 let mut git_diff_updated = false;
1702 let mut is_dirty = false;
1703 let mut has_conflict = false;
1704 let mut edited = false;
1705 let mut buffers = self.buffers.borrow_mut();
1706 for buffer_state in buffers.values_mut() {
1707 let buffer = buffer_state.buffer.read(cx);
1708 let version = buffer.version();
1709 let parse_count = buffer.parse_count();
1710 let selections_update_count = buffer.selections_update_count();
1711 let diagnostics_update_count = buffer.diagnostics_update_count();
1712 let file_update_count = buffer.file_update_count();
1713 let git_diff_update_count = buffer.git_diff_update_count();
1714
1715 let buffer_edited = version.changed_since(&buffer_state.last_version);
1716 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
1717 let buffer_selections_updated =
1718 selections_update_count > buffer_state.last_selections_update_count;
1719 let buffer_diagnostics_updated =
1720 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
1721 let buffer_file_updated = file_update_count > buffer_state.last_file_update_count;
1722 let buffer_git_diff_updated =
1723 git_diff_update_count > buffer_state.last_git_diff_update_count;
1724 if buffer_edited
1725 || buffer_reparsed
1726 || buffer_selections_updated
1727 || buffer_diagnostics_updated
1728 || buffer_file_updated
1729 || buffer_git_diff_updated
1730 {
1731 buffer_state.last_version = version;
1732 buffer_state.last_parse_count = parse_count;
1733 buffer_state.last_selections_update_count = selections_update_count;
1734 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
1735 buffer_state.last_file_update_count = file_update_count;
1736 buffer_state.last_git_diff_update_count = git_diff_update_count;
1737 excerpts_to_edit.extend(
1738 buffer_state
1739 .excerpts
1740 .iter()
1741 .map(|locator| (locator, buffer_state.buffer.clone(), buffer_edited)),
1742 );
1743 }
1744
1745 edited |= buffer_edited;
1746 reparsed |= buffer_reparsed;
1747 diagnostics_updated |= buffer_diagnostics_updated;
1748 git_diff_updated |= buffer_git_diff_updated;
1749 is_dirty |= buffer.is_dirty();
1750 has_conflict |= buffer.has_conflict();
1751 }
1752 if edited {
1753 snapshot.edit_count += 1;
1754 }
1755 if reparsed {
1756 snapshot.parse_count += 1;
1757 }
1758 if diagnostics_updated {
1759 snapshot.diagnostics_update_count += 1;
1760 }
1761 if git_diff_updated {
1762 snapshot.git_diff_update_count += 1;
1763 }
1764 snapshot.is_dirty = is_dirty;
1765 snapshot.has_conflict = has_conflict;
1766
1767 excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);
1768
1769 let mut edits = Vec::new();
1770 let mut new_excerpts = SumTree::new();
1771 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1772
1773 for (locator, buffer, buffer_edited) in excerpts_to_edit {
1774 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left, &()), &());
1775 let old_excerpt = cursor.item().unwrap();
1776 let buffer = buffer.read(cx);
1777 let buffer_id = buffer.remote_id();
1778
1779 let mut new_excerpt;
1780 if buffer_edited {
1781 edits.extend(
1782 buffer
1783 .edits_since_in_range::<usize>(
1784 old_excerpt.buffer.version(),
1785 old_excerpt.range.context.clone(),
1786 )
1787 .map(|mut edit| {
1788 let excerpt_old_start = cursor.start().1;
1789 let excerpt_new_start = new_excerpts.summary().text.len;
1790 edit.old.start += excerpt_old_start;
1791 edit.old.end += excerpt_old_start;
1792 edit.new.start += excerpt_new_start;
1793 edit.new.end += excerpt_new_start;
1794 edit
1795 }),
1796 );
1797
1798 new_excerpt = Excerpt::new(
1799 old_excerpt.id,
1800 locator.clone(),
1801 buffer_id,
1802 buffer.snapshot(),
1803 old_excerpt.range.clone(),
1804 old_excerpt.has_trailing_newline,
1805 );
1806 } else {
1807 new_excerpt = old_excerpt.clone();
1808 new_excerpt.buffer = buffer.snapshot();
1809 }
1810
1811 new_excerpts.push(new_excerpt, &());
1812 cursor.next(&());
1813 }
1814 new_excerpts.append(cursor.suffix(&()), &());
1815
1816 drop(cursor);
1817 snapshot.excerpts = new_excerpts;
1818
1819 self.subscriptions.publish(edits);
1820 }
1821}
1822
1823#[cfg(any(test, feature = "test-support"))]
1824impl MultiBuffer {
1825 pub fn build_simple(text: &str, cx: &mut gpui::AppContext) -> Model<Self> {
1826 let buffer = cx.new_model(|cx| Buffer::local(text, cx));
1827 cx.new_model(|cx| Self::singleton(buffer, cx))
1828 }
1829
1830 pub fn build_multi<const COUNT: usize>(
1831 excerpts: [(&str, Vec<Range<Point>>); COUNT],
1832 cx: &mut gpui::AppContext,
1833 ) -> Model<Self> {
1834 let multi = cx.new_model(|_| Self::new(0, Capability::ReadWrite));
1835 for (text, ranges) in excerpts {
1836 let buffer = cx.new_model(|cx| Buffer::local(text, cx));
1837 let excerpt_ranges = ranges.into_iter().map(|range| ExcerptRange {
1838 context: range,
1839 primary: None,
1840 });
1841 multi.update(cx, |multi, cx| {
1842 multi.push_excerpts(buffer, excerpt_ranges, cx)
1843 });
1844 }
1845
1846 multi
1847 }
1848
1849 pub fn build_from_buffer(buffer: Model<Buffer>, cx: &mut gpui::AppContext) -> Model<Self> {
1850 cx.new_model(|cx| Self::singleton(buffer, cx))
1851 }
1852
1853 pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::AppContext) -> Model<Self> {
1854 cx.new_model(|cx| {
1855 let mut multibuffer = MultiBuffer::new(0, Capability::ReadWrite);
1856 let mutation_count = rng.gen_range(1..=5);
1857 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
1858 multibuffer
1859 })
1860 }
1861
1862 pub fn randomly_edit(
1863 &mut self,
1864 rng: &mut impl rand::Rng,
1865 edit_count: usize,
1866 cx: &mut ModelContext<Self>,
1867 ) {
1868 use util::RandomCharIter;
1869
1870 let snapshot = self.read(cx);
1871 let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
1872 let mut last_end = None;
1873 for _ in 0..edit_count {
1874 if last_end.map_or(false, |last_end| last_end >= snapshot.len()) {
1875 break;
1876 }
1877
1878 let new_start = last_end.map_or(0, |last_end| last_end + 1);
1879 let end = snapshot.clip_offset(rng.gen_range(new_start..=snapshot.len()), Bias::Right);
1880 let start = snapshot.clip_offset(rng.gen_range(new_start..=end), Bias::Right);
1881 last_end = Some(end);
1882
1883 let mut range = start..end;
1884 if rng.gen_bool(0.2) {
1885 mem::swap(&mut range.start, &mut range.end);
1886 }
1887
1888 let new_text_len = rng.gen_range(0..10);
1889 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1890
1891 edits.push((range, new_text.into()));
1892 }
1893 log::info!("mutating multi-buffer with {:?}", edits);
1894 drop(snapshot);
1895
1896 self.edit(edits, None, cx);
1897 }
1898
1899 pub fn randomly_edit_excerpts(
1900 &mut self,
1901 rng: &mut impl rand::Rng,
1902 mutation_count: usize,
1903 cx: &mut ModelContext<Self>,
1904 ) {
1905 use rand::prelude::*;
1906 use std::env;
1907 use util::RandomCharIter;
1908
1909 let max_excerpts = env::var("MAX_EXCERPTS")
1910 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
1911 .unwrap_or(5);
1912
1913 let mut buffers = Vec::new();
1914 for _ in 0..mutation_count {
1915 if rng.gen_bool(0.05) {
1916 log::info!("Clearing multi-buffer");
1917 self.clear(cx);
1918 continue;
1919 } else if rng.gen_bool(0.1) && !self.excerpt_ids().is_empty() {
1920 let ids = self.excerpt_ids();
1921 let mut excerpts = HashSet::default();
1922 for _ in 0..rng.gen_range(0..ids.len()) {
1923 excerpts.extend(ids.choose(rng).copied());
1924 }
1925
1926 let line_count = rng.gen_range(0..5);
1927
1928 log::info!("Expanding excerpts {excerpts:?} by {line_count} lines");
1929
1930 self.expand_excerpts(excerpts.iter().cloned(), line_count, cx);
1931 continue;
1932 }
1933
1934 let excerpt_ids = self.excerpt_ids();
1935 if excerpt_ids.is_empty() || (rng.gen() && excerpt_ids.len() < max_excerpts) {
1936 let buffer_handle = if rng.gen() || self.buffers.borrow().is_empty() {
1937 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
1938 buffers.push(cx.new_model(|cx| Buffer::local(text, cx)));
1939 let buffer = buffers.last().unwrap().read(cx);
1940 log::info!(
1941 "Creating new buffer {} with text: {:?}",
1942 buffer.remote_id(),
1943 buffer.text()
1944 );
1945 buffers.last().unwrap().clone()
1946 } else {
1947 self.buffers
1948 .borrow()
1949 .values()
1950 .choose(rng)
1951 .unwrap()
1952 .buffer
1953 .clone()
1954 };
1955
1956 let buffer = buffer_handle.read(cx);
1957 let buffer_text = buffer.text();
1958 let ranges = (0..rng.gen_range(0..5))
1959 .map(|_| {
1960 let end_ix =
1961 buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
1962 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1963 ExcerptRange {
1964 context: start_ix..end_ix,
1965 primary: None,
1966 }
1967 })
1968 .collect::<Vec<_>>();
1969 log::info!(
1970 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
1971 buffer_handle.read(cx).remote_id(),
1972 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
1973 ranges
1974 .iter()
1975 .map(|r| &buffer_text[r.context.clone()])
1976 .collect::<Vec<_>>()
1977 );
1978
1979 let excerpt_id = self.push_excerpts(buffer_handle.clone(), ranges, cx);
1980 log::info!("Inserted with ids: {:?}", excerpt_id);
1981 } else {
1982 let remove_count = rng.gen_range(1..=excerpt_ids.len());
1983 let mut excerpts_to_remove = excerpt_ids
1984 .choose_multiple(rng, remove_count)
1985 .cloned()
1986 .collect::<Vec<_>>();
1987 let snapshot = self.snapshot.borrow();
1988 excerpts_to_remove.sort_unstable_by(|a, b| a.cmp(b, &snapshot));
1989 drop(snapshot);
1990 log::info!("Removing excerpts {:?}", excerpts_to_remove);
1991 self.remove_excerpts(excerpts_to_remove, cx);
1992 }
1993 }
1994 }
1995
1996 pub fn randomly_mutate(
1997 &mut self,
1998 rng: &mut impl rand::Rng,
1999 mutation_count: usize,
2000 cx: &mut ModelContext<Self>,
2001 ) {
2002 use rand::prelude::*;
2003
2004 if rng.gen_bool(0.7) || self.singleton {
2005 let buffer = self
2006 .buffers
2007 .borrow()
2008 .values()
2009 .choose(rng)
2010 .map(|state| state.buffer.clone());
2011
2012 if let Some(buffer) = buffer {
2013 buffer.update(cx, |buffer, cx| {
2014 if rng.gen() {
2015 buffer.randomly_edit(rng, mutation_count, cx);
2016 } else {
2017 buffer.randomly_undo_redo(rng, cx);
2018 }
2019 });
2020 } else {
2021 self.randomly_edit(rng, mutation_count, cx);
2022 }
2023 } else {
2024 self.randomly_edit_excerpts(rng, mutation_count, cx);
2025 }
2026
2027 self.check_invariants(cx);
2028 }
2029
2030 fn check_invariants(&self, cx: &mut ModelContext<Self>) {
2031 let snapshot = self.read(cx);
2032 let excerpts = snapshot.excerpts.items(&());
2033 let excerpt_ids = snapshot.excerpt_ids.items(&());
2034
2035 for (ix, excerpt) in excerpts.iter().enumerate() {
2036 if ix == 0 {
2037 if excerpt.locator <= Locator::min() {
2038 panic!("invalid first excerpt locator {:?}", excerpt.locator);
2039 }
2040 } else {
2041 if excerpt.locator <= excerpts[ix - 1].locator {
2042 panic!("excerpts are out-of-order: {:?}", excerpts);
2043 }
2044 }
2045 }
2046
2047 for (ix, entry) in excerpt_ids.iter().enumerate() {
2048 if ix == 0 {
2049 if entry.id.cmp(&ExcerptId::min(), &snapshot).is_le() {
2050 panic!("invalid first excerpt id {:?}", entry.id);
2051 }
2052 } else {
2053 if entry.id <= excerpt_ids[ix - 1].id {
2054 panic!("excerpt ids are out-of-order: {:?}", excerpt_ids);
2055 }
2056 }
2057 }
2058 }
2059}
2060
2061impl EventEmitter<Event> for MultiBuffer {}
2062
2063impl MultiBufferSnapshot {
2064 pub fn text(&self) -> String {
2065 self.chunks(0..self.len(), false)
2066 .map(|chunk| chunk.text)
2067 .collect()
2068 }
2069
2070 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
2071 let mut offset = position.to_offset(self);
2072 let mut cursor = self.excerpts.cursor::<usize>();
2073 cursor.seek(&offset, Bias::Left, &());
2074 let mut excerpt_chunks = cursor.item().map(|excerpt| {
2075 let end_before_footer = cursor.start() + excerpt.text_summary.len;
2076 let start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2077 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
2078 excerpt.buffer.reversed_chunks_in_range(start..end)
2079 });
2080 iter::from_fn(move || {
2081 if offset == *cursor.start() {
2082 cursor.prev(&());
2083 let excerpt = cursor.item()?;
2084 excerpt_chunks = Some(
2085 excerpt
2086 .buffer
2087 .reversed_chunks_in_range(excerpt.range.context.clone()),
2088 );
2089 }
2090
2091 let excerpt = cursor.item().unwrap();
2092 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
2093 offset -= 1;
2094 Some("\n")
2095 } else {
2096 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
2097 offset -= chunk.len();
2098 Some(chunk)
2099 }
2100 })
2101 .flat_map(|c| c.chars().rev())
2102 }
2103
2104 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
2105 let offset = position.to_offset(self);
2106 self.text_for_range(offset..self.len())
2107 .flat_map(|chunk| chunk.chars())
2108 }
2109
2110 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
2111 self.chunks(range, false).map(|chunk| chunk.text)
2112 }
2113
2114 pub fn is_line_blank(&self, row: u32) -> bool {
2115 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
2116 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
2117 }
2118
2119 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
2120 where
2121 T: ToOffset,
2122 {
2123 let position = position.to_offset(self);
2124 position == self.clip_offset(position, Bias::Left)
2125 && self
2126 .bytes_in_range(position..self.len())
2127 .flatten()
2128 .copied()
2129 .take(needle.len())
2130 .eq(needle.bytes())
2131 }
2132
2133 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
2134 let mut start = start.to_offset(self);
2135 let mut end = start;
2136 let mut next_chars = self.chars_at(start).peekable();
2137 let mut prev_chars = self.reversed_chars_at(start).peekable();
2138
2139 let scope = self.language_scope_at(start);
2140 let kind = |c| char_kind(&scope, c);
2141 let word_kind = cmp::max(
2142 prev_chars.peek().copied().map(kind),
2143 next_chars.peek().copied().map(kind),
2144 );
2145
2146 for ch in prev_chars {
2147 if Some(kind(ch)) == word_kind && ch != '\n' {
2148 start -= ch.len_utf8();
2149 } else {
2150 break;
2151 }
2152 }
2153
2154 for ch in next_chars {
2155 if Some(kind(ch)) == word_kind && ch != '\n' {
2156 end += ch.len_utf8();
2157 } else {
2158 break;
2159 }
2160 }
2161
2162 (start..end, word_kind)
2163 }
2164
2165 pub fn as_singleton(&self) -> Option<(&ExcerptId, BufferId, &BufferSnapshot)> {
2166 if self.singleton {
2167 self.excerpts
2168 .iter()
2169 .next()
2170 .map(|e| (&e.id, e.buffer_id, &e.buffer))
2171 } else {
2172 None
2173 }
2174 }
2175
2176 pub fn len(&self) -> usize {
2177 self.excerpts.summary().text.len
2178 }
2179
2180 pub fn is_empty(&self) -> bool {
2181 self.excerpts.summary().text.len == 0
2182 }
2183
2184 pub fn max_buffer_row(&self) -> u32 {
2185 self.excerpts.summary().max_buffer_row
2186 }
2187
2188 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
2189 if let Some((_, _, buffer)) = self.as_singleton() {
2190 return buffer.clip_offset(offset, bias);
2191 }
2192
2193 let mut cursor = self.excerpts.cursor::<usize>();
2194 cursor.seek(&offset, Bias::Right, &());
2195 let overshoot = if let Some(excerpt) = cursor.item() {
2196 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2197 let buffer_offset = excerpt
2198 .buffer
2199 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
2200 buffer_offset.saturating_sub(excerpt_start)
2201 } else {
2202 0
2203 };
2204 cursor.start() + overshoot
2205 }
2206
2207 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
2208 if let Some((_, _, buffer)) = self.as_singleton() {
2209 return buffer.clip_point(point, bias);
2210 }
2211
2212 let mut cursor = self.excerpts.cursor::<Point>();
2213 cursor.seek(&point, Bias::Right, &());
2214 let overshoot = if let Some(excerpt) = cursor.item() {
2215 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
2216 let buffer_point = excerpt
2217 .buffer
2218 .clip_point(excerpt_start + (point - cursor.start()), bias);
2219 buffer_point.saturating_sub(excerpt_start)
2220 } else {
2221 Point::zero()
2222 };
2223 *cursor.start() + overshoot
2224 }
2225
2226 pub fn clip_offset_utf16(&self, offset: OffsetUtf16, bias: Bias) -> OffsetUtf16 {
2227 if let Some((_, _, buffer)) = self.as_singleton() {
2228 return buffer.clip_offset_utf16(offset, bias);
2229 }
2230
2231 let mut cursor = self.excerpts.cursor::<OffsetUtf16>();
2232 cursor.seek(&offset, Bias::Right, &());
2233 let overshoot = if let Some(excerpt) = cursor.item() {
2234 let excerpt_start = excerpt.range.context.start.to_offset_utf16(&excerpt.buffer);
2235 let buffer_offset = excerpt
2236 .buffer
2237 .clip_offset_utf16(excerpt_start + (offset - cursor.start()), bias);
2238 OffsetUtf16(buffer_offset.0.saturating_sub(excerpt_start.0))
2239 } else {
2240 OffsetUtf16(0)
2241 };
2242 *cursor.start() + overshoot
2243 }
2244
2245 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
2246 if let Some((_, _, buffer)) = self.as_singleton() {
2247 return buffer.clip_point_utf16(point, bias);
2248 }
2249
2250 let mut cursor = self.excerpts.cursor::<PointUtf16>();
2251 cursor.seek(&point.0, Bias::Right, &());
2252 let overshoot = if let Some(excerpt) = cursor.item() {
2253 let excerpt_start = excerpt
2254 .buffer
2255 .offset_to_point_utf16(excerpt.range.context.start.to_offset(&excerpt.buffer));
2256 let buffer_point = excerpt
2257 .buffer
2258 .clip_point_utf16(Unclipped(excerpt_start + (point.0 - cursor.start())), bias);
2259 buffer_point.saturating_sub(excerpt_start)
2260 } else {
2261 PointUtf16::zero()
2262 };
2263 *cursor.start() + overshoot
2264 }
2265
2266 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes {
2267 let range = range.start.to_offset(self)..range.end.to_offset(self);
2268 let mut excerpts = self.excerpts.cursor::<usize>();
2269 excerpts.seek(&range.start, Bias::Right, &());
2270
2271 let mut chunk = &[][..];
2272 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
2273 let mut excerpt_bytes = excerpt
2274 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
2275 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
2276 Some(excerpt_bytes)
2277 } else {
2278 None
2279 };
2280 MultiBufferBytes {
2281 range,
2282 excerpts,
2283 excerpt_bytes,
2284 chunk,
2285 }
2286 }
2287
2288 pub fn reversed_bytes_in_range<T: ToOffset>(
2289 &self,
2290 range: Range<T>,
2291 ) -> ReversedMultiBufferBytes {
2292 let range = range.start.to_offset(self)..range.end.to_offset(self);
2293 let mut excerpts = self.excerpts.cursor::<usize>();
2294 excerpts.seek(&range.end, Bias::Left, &());
2295
2296 let mut chunk = &[][..];
2297 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
2298 let mut excerpt_bytes = excerpt.reversed_bytes_in_range(
2299 range.start.saturating_sub(*excerpts.start())..range.end - *excerpts.start(),
2300 );
2301 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
2302 Some(excerpt_bytes)
2303 } else {
2304 None
2305 };
2306
2307 ReversedMultiBufferBytes {
2308 range,
2309 excerpts,
2310 excerpt_bytes,
2311 chunk,
2312 }
2313 }
2314
2315 pub fn buffer_rows(&self, start_row: u32) -> MultiBufferRows {
2316 let mut result = MultiBufferRows {
2317 buffer_row_range: 0..0,
2318 excerpts: self.excerpts.cursor(),
2319 };
2320 result.seek(start_row);
2321 result
2322 }
2323
2324 pub fn chunks<T: ToOffset>(&self, range: Range<T>, language_aware: bool) -> MultiBufferChunks {
2325 let range = range.start.to_offset(self)..range.end.to_offset(self);
2326 let mut chunks = MultiBufferChunks {
2327 range: range.clone(),
2328 excerpts: self.excerpts.cursor(),
2329 excerpt_chunks: None,
2330 language_aware,
2331 };
2332 chunks.seek(range.start);
2333 chunks
2334 }
2335
2336 pub fn offset_to_point(&self, offset: usize) -> Point {
2337 if let Some((_, _, buffer)) = self.as_singleton() {
2338 return buffer.offset_to_point(offset);
2339 }
2340
2341 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
2342 cursor.seek(&offset, Bias::Right, &());
2343 if let Some(excerpt) = cursor.item() {
2344 let (start_offset, start_point) = cursor.start();
2345 let overshoot = offset - start_offset;
2346 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2347 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
2348 let buffer_point = excerpt
2349 .buffer
2350 .offset_to_point(excerpt_start_offset + overshoot);
2351 *start_point + (buffer_point - excerpt_start_point)
2352 } else {
2353 self.excerpts.summary().text.lines
2354 }
2355 }
2356
2357 pub fn offset_to_point_utf16(&self, offset: usize) -> PointUtf16 {
2358 if let Some((_, _, buffer)) = self.as_singleton() {
2359 return buffer.offset_to_point_utf16(offset);
2360 }
2361
2362 let mut cursor = self.excerpts.cursor::<(usize, PointUtf16)>();
2363 cursor.seek(&offset, Bias::Right, &());
2364 if let Some(excerpt) = cursor.item() {
2365 let (start_offset, start_point) = cursor.start();
2366 let overshoot = offset - start_offset;
2367 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2368 let excerpt_start_point = excerpt.range.context.start.to_point_utf16(&excerpt.buffer);
2369 let buffer_point = excerpt
2370 .buffer
2371 .offset_to_point_utf16(excerpt_start_offset + overshoot);
2372 *start_point + (buffer_point - excerpt_start_point)
2373 } else {
2374 self.excerpts.summary().text.lines_utf16()
2375 }
2376 }
2377
2378 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
2379 if let Some((_, _, buffer)) = self.as_singleton() {
2380 return buffer.point_to_point_utf16(point);
2381 }
2382
2383 let mut cursor = self.excerpts.cursor::<(Point, PointUtf16)>();
2384 cursor.seek(&point, Bias::Right, &());
2385 if let Some(excerpt) = cursor.item() {
2386 let (start_offset, start_point) = cursor.start();
2387 let overshoot = point - start_offset;
2388 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
2389 let excerpt_start_point_utf16 =
2390 excerpt.range.context.start.to_point_utf16(&excerpt.buffer);
2391 let buffer_point = excerpt
2392 .buffer
2393 .point_to_point_utf16(excerpt_start_point + overshoot);
2394 *start_point + (buffer_point - excerpt_start_point_utf16)
2395 } else {
2396 self.excerpts.summary().text.lines_utf16()
2397 }
2398 }
2399
2400 pub fn point_to_offset(&self, point: Point) -> usize {
2401 if let Some((_, _, buffer)) = self.as_singleton() {
2402 return buffer.point_to_offset(point);
2403 }
2404
2405 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
2406 cursor.seek(&point, Bias::Right, &());
2407 if let Some(excerpt) = cursor.item() {
2408 let (start_point, start_offset) = cursor.start();
2409 let overshoot = point - start_point;
2410 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2411 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
2412 let buffer_offset = excerpt
2413 .buffer
2414 .point_to_offset(excerpt_start_point + overshoot);
2415 *start_offset + buffer_offset - excerpt_start_offset
2416 } else {
2417 self.excerpts.summary().text.len
2418 }
2419 }
2420
2421 pub fn offset_utf16_to_offset(&self, offset_utf16: OffsetUtf16) -> usize {
2422 if let Some((_, _, buffer)) = self.as_singleton() {
2423 return buffer.offset_utf16_to_offset(offset_utf16);
2424 }
2425
2426 let mut cursor = self.excerpts.cursor::<(OffsetUtf16, usize)>();
2427 cursor.seek(&offset_utf16, Bias::Right, &());
2428 if let Some(excerpt) = cursor.item() {
2429 let (start_offset_utf16, start_offset) = cursor.start();
2430 let overshoot = offset_utf16 - start_offset_utf16;
2431 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2432 let excerpt_start_offset_utf16 =
2433 excerpt.buffer.offset_to_offset_utf16(excerpt_start_offset);
2434 let buffer_offset = excerpt
2435 .buffer
2436 .offset_utf16_to_offset(excerpt_start_offset_utf16 + overshoot);
2437 *start_offset + (buffer_offset - excerpt_start_offset)
2438 } else {
2439 self.excerpts.summary().text.len
2440 }
2441 }
2442
2443 pub fn offset_to_offset_utf16(&self, offset: usize) -> OffsetUtf16 {
2444 if let Some((_, _, buffer)) = self.as_singleton() {
2445 return buffer.offset_to_offset_utf16(offset);
2446 }
2447
2448 let mut cursor = self.excerpts.cursor::<(usize, OffsetUtf16)>();
2449 cursor.seek(&offset, Bias::Right, &());
2450 if let Some(excerpt) = cursor.item() {
2451 let (start_offset, start_offset_utf16) = cursor.start();
2452 let overshoot = offset - start_offset;
2453 let excerpt_start_offset_utf16 =
2454 excerpt.range.context.start.to_offset_utf16(&excerpt.buffer);
2455 let excerpt_start_offset = excerpt
2456 .buffer
2457 .offset_utf16_to_offset(excerpt_start_offset_utf16);
2458 let buffer_offset_utf16 = excerpt
2459 .buffer
2460 .offset_to_offset_utf16(excerpt_start_offset + overshoot);
2461 *start_offset_utf16 + (buffer_offset_utf16 - excerpt_start_offset_utf16)
2462 } else {
2463 self.excerpts.summary().text.len_utf16
2464 }
2465 }
2466
2467 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
2468 if let Some((_, _, buffer)) = self.as_singleton() {
2469 return buffer.point_utf16_to_offset(point);
2470 }
2471
2472 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
2473 cursor.seek(&point, Bias::Right, &());
2474 if let Some(excerpt) = cursor.item() {
2475 let (start_point, start_offset) = cursor.start();
2476 let overshoot = point - start_point;
2477 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2478 let excerpt_start_point = excerpt
2479 .buffer
2480 .offset_to_point_utf16(excerpt.range.context.start.to_offset(&excerpt.buffer));
2481 let buffer_offset = excerpt
2482 .buffer
2483 .point_utf16_to_offset(excerpt_start_point + overshoot);
2484 *start_offset + (buffer_offset - excerpt_start_offset)
2485 } else {
2486 self.excerpts.summary().text.len
2487 }
2488 }
2489
2490 pub fn point_to_buffer_offset<T: ToOffset>(
2491 &self,
2492 point: T,
2493 ) -> Option<(&BufferSnapshot, usize)> {
2494 let offset = point.to_offset(self);
2495 let mut cursor = self.excerpts.cursor::<usize>();
2496 cursor.seek(&offset, Bias::Right, &());
2497 if cursor.item().is_none() {
2498 cursor.prev(&());
2499 }
2500
2501 cursor.item().map(|excerpt| {
2502 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2503 let buffer_point = excerpt_start + offset - *cursor.start();
2504 (&excerpt.buffer, buffer_point)
2505 })
2506 }
2507
2508 pub fn suggested_indents(
2509 &self,
2510 rows: impl IntoIterator<Item = u32>,
2511 cx: &AppContext,
2512 ) -> BTreeMap<u32, IndentSize> {
2513 let mut result = BTreeMap::new();
2514
2515 let mut rows_for_excerpt = Vec::new();
2516 let mut cursor = self.excerpts.cursor::<Point>();
2517 let mut rows = rows.into_iter().peekable();
2518 let mut prev_row = u32::MAX;
2519 let mut prev_language_indent_size = IndentSize::default();
2520
2521 while let Some(row) = rows.next() {
2522 cursor.seek(&Point::new(row, 0), Bias::Right, &());
2523 let excerpt = match cursor.item() {
2524 Some(excerpt) => excerpt,
2525 _ => continue,
2526 };
2527
2528 // Retrieve the language and indent size once for each disjoint region being indented.
2529 let single_indent_size = if row.saturating_sub(1) == prev_row {
2530 prev_language_indent_size
2531 } else {
2532 excerpt
2533 .buffer
2534 .language_indent_size_at(Point::new(row, 0), cx)
2535 };
2536 prev_language_indent_size = single_indent_size;
2537 prev_row = row;
2538
2539 let start_buffer_row = excerpt.range.context.start.to_point(&excerpt.buffer).row;
2540 let start_multibuffer_row = cursor.start().row;
2541
2542 rows_for_excerpt.push(row);
2543 while let Some(next_row) = rows.peek().copied() {
2544 if cursor.end(&()).row > next_row {
2545 rows_for_excerpt.push(next_row);
2546 rows.next();
2547 } else {
2548 break;
2549 }
2550 }
2551
2552 let buffer_rows = rows_for_excerpt
2553 .drain(..)
2554 .map(|row| start_buffer_row + row - start_multibuffer_row);
2555 let buffer_indents = excerpt
2556 .buffer
2557 .suggested_indents(buffer_rows, single_indent_size);
2558 let multibuffer_indents = buffer_indents
2559 .into_iter()
2560 .map(|(row, indent)| (start_multibuffer_row + row - start_buffer_row, indent));
2561 result.extend(multibuffer_indents);
2562 }
2563
2564 result
2565 }
2566
2567 pub fn indent_size_for_line(&self, row: u32) -> IndentSize {
2568 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
2569 let mut size = buffer.indent_size_for_line(range.start.row);
2570 size.len = size
2571 .len
2572 .min(range.end.column)
2573 .saturating_sub(range.start.column);
2574 size
2575 } else {
2576 IndentSize::spaces(0)
2577 }
2578 }
2579
2580 pub fn prev_non_blank_row(&self, mut row: u32) -> Option<u32> {
2581 while row > 0 {
2582 row -= 1;
2583 if !self.is_line_blank(row) {
2584 return Some(row);
2585 }
2586 }
2587 None
2588 }
2589
2590 pub fn line_len(&self, row: u32) -> u32 {
2591 if let Some((_, range)) = self.buffer_line_for_row(row) {
2592 range.end.column - range.start.column
2593 } else {
2594 0
2595 }
2596 }
2597
2598 pub fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
2599 let mut cursor = self.excerpts.cursor::<Point>();
2600 let point = Point::new(row, 0);
2601 cursor.seek(&point, Bias::Right, &());
2602 if cursor.item().is_none() && *cursor.start() == point {
2603 cursor.prev(&());
2604 }
2605 if let Some(excerpt) = cursor.item() {
2606 let overshoot = row - cursor.start().row;
2607 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
2608 let excerpt_end = excerpt.range.context.end.to_point(&excerpt.buffer);
2609 let buffer_row = excerpt_start.row + overshoot;
2610 let line_start = Point::new(buffer_row, 0);
2611 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
2612 return Some((
2613 &excerpt.buffer,
2614 line_start.max(excerpt_start)..line_end.min(excerpt_end),
2615 ));
2616 }
2617 None
2618 }
2619
2620 pub fn max_point(&self) -> Point {
2621 self.text_summary().lines
2622 }
2623
2624 pub fn text_summary(&self) -> TextSummary {
2625 self.excerpts.summary().text.clone()
2626 }
2627
2628 pub fn text_summary_for_range<D, O>(&self, range: Range<O>) -> D
2629 where
2630 D: TextDimension,
2631 O: ToOffset,
2632 {
2633 let mut summary = D::default();
2634 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
2635 let mut cursor = self.excerpts.cursor::<usize>();
2636 cursor.seek(&range.start, Bias::Right, &());
2637 if let Some(excerpt) = cursor.item() {
2638 let mut end_before_newline = cursor.end(&());
2639 if excerpt.has_trailing_newline {
2640 end_before_newline -= 1;
2641 }
2642
2643 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2644 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
2645 let end_in_excerpt =
2646 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
2647 summary.add_assign(
2648 &excerpt
2649 .buffer
2650 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
2651 );
2652
2653 if range.end > end_before_newline {
2654 summary.add_assign(&D::from_text_summary(&TextSummary::from("\n")));
2655 }
2656
2657 cursor.next(&());
2658 }
2659
2660 if range.end > *cursor.start() {
2661 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
2662 &range.end,
2663 Bias::Right,
2664 &(),
2665 )));
2666 if let Some(excerpt) = cursor.item() {
2667 range.end = cmp::max(*cursor.start(), range.end);
2668
2669 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2670 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
2671 summary.add_assign(
2672 &excerpt
2673 .buffer
2674 .text_summary_for_range(excerpt_start..end_in_excerpt),
2675 );
2676 }
2677 }
2678
2679 summary
2680 }
2681
2682 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
2683 where
2684 D: TextDimension + Ord + Sub<D, Output = D>,
2685 {
2686 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2687 let locator = self.excerpt_locator_for_id(anchor.excerpt_id);
2688
2689 cursor.seek(locator, Bias::Left, &());
2690 if cursor.item().is_none() {
2691 cursor.next(&());
2692 }
2693
2694 let mut position = D::from_text_summary(&cursor.start().text);
2695 if let Some(excerpt) = cursor.item() {
2696 if excerpt.id == anchor.excerpt_id {
2697 let excerpt_buffer_start =
2698 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
2699 let excerpt_buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
2700 let buffer_position = cmp::min(
2701 excerpt_buffer_end,
2702 anchor.text_anchor.summary::<D>(&excerpt.buffer),
2703 );
2704 if buffer_position > excerpt_buffer_start {
2705 position.add_assign(&(buffer_position - excerpt_buffer_start));
2706 }
2707 }
2708 }
2709 position
2710 }
2711
2712 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
2713 where
2714 D: TextDimension + Ord + Sub<D, Output = D>,
2715 I: 'a + IntoIterator<Item = &'a Anchor>,
2716 {
2717 if let Some((_, _, buffer)) = self.as_singleton() {
2718 return buffer
2719 .summaries_for_anchors(anchors.into_iter().map(|a| &a.text_anchor))
2720 .collect();
2721 }
2722
2723 let mut anchors = anchors.into_iter().peekable();
2724 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2725 let mut summaries = Vec::new();
2726 while let Some(anchor) = anchors.peek() {
2727 let excerpt_id = anchor.excerpt_id;
2728 let excerpt_anchors = iter::from_fn(|| {
2729 let anchor = anchors.peek()?;
2730 if anchor.excerpt_id == excerpt_id {
2731 Some(&anchors.next().unwrap().text_anchor)
2732 } else {
2733 None
2734 }
2735 });
2736
2737 let locator = self.excerpt_locator_for_id(excerpt_id);
2738 cursor.seek_forward(locator, Bias::Left, &());
2739 if cursor.item().is_none() {
2740 cursor.next(&());
2741 }
2742
2743 let position = D::from_text_summary(&cursor.start().text);
2744 if let Some(excerpt) = cursor.item() {
2745 if excerpt.id == excerpt_id {
2746 let excerpt_buffer_start =
2747 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
2748 let excerpt_buffer_end =
2749 excerpt.range.context.end.summary::<D>(&excerpt.buffer);
2750 summaries.extend(
2751 excerpt
2752 .buffer
2753 .summaries_for_anchors::<D, _>(excerpt_anchors)
2754 .map(move |summary| {
2755 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
2756 let mut position = position.clone();
2757 let excerpt_buffer_start = excerpt_buffer_start.clone();
2758 if summary > excerpt_buffer_start {
2759 position.add_assign(&(summary - excerpt_buffer_start));
2760 }
2761 position
2762 }),
2763 );
2764 continue;
2765 }
2766 }
2767
2768 summaries.extend(excerpt_anchors.map(|_| position.clone()));
2769 }
2770
2771 summaries
2772 }
2773
2774 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
2775 where
2776 I: 'a + IntoIterator<Item = &'a Anchor>,
2777 {
2778 let mut anchors = anchors.into_iter().enumerate().peekable();
2779 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2780 cursor.next(&());
2781
2782 let mut result = Vec::new();
2783
2784 while let Some((_, anchor)) = anchors.peek() {
2785 let old_excerpt_id = anchor.excerpt_id;
2786
2787 // Find the location where this anchor's excerpt should be.
2788 let old_locator = self.excerpt_locator_for_id(old_excerpt_id);
2789 cursor.seek_forward(&Some(old_locator), Bias::Left, &());
2790
2791 if cursor.item().is_none() {
2792 cursor.next(&());
2793 }
2794
2795 let next_excerpt = cursor.item();
2796 let prev_excerpt = cursor.prev_item();
2797
2798 // Process all of the anchors for this excerpt.
2799 while let Some((_, anchor)) = anchors.peek() {
2800 if anchor.excerpt_id != old_excerpt_id {
2801 break;
2802 }
2803 let (anchor_ix, anchor) = anchors.next().unwrap();
2804 let mut anchor = *anchor;
2805
2806 // Leave min and max anchors unchanged if invalid or
2807 // if the old excerpt still exists at this location
2808 let mut kept_position = next_excerpt
2809 .map_or(false, |e| e.id == old_excerpt_id && e.contains(&anchor))
2810 || old_excerpt_id == ExcerptId::max()
2811 || old_excerpt_id == ExcerptId::min();
2812
2813 // If the old excerpt no longer exists at this location, then attempt to
2814 // find an equivalent position for this anchor in an adjacent excerpt.
2815 if !kept_position {
2816 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
2817 if excerpt.contains(&anchor) {
2818 anchor.excerpt_id = excerpt.id;
2819 kept_position = true;
2820 break;
2821 }
2822 }
2823 }
2824
2825 // If there's no adjacent excerpt that contains the anchor's position,
2826 // then report that the anchor has lost its position.
2827 if !kept_position {
2828 anchor = if let Some(excerpt) = next_excerpt {
2829 let mut text_anchor = excerpt
2830 .range
2831 .context
2832 .start
2833 .bias(anchor.text_anchor.bias, &excerpt.buffer);
2834 if text_anchor
2835 .cmp(&excerpt.range.context.end, &excerpt.buffer)
2836 .is_gt()
2837 {
2838 text_anchor = excerpt.range.context.end;
2839 }
2840 Anchor {
2841 buffer_id: Some(excerpt.buffer_id),
2842 excerpt_id: excerpt.id,
2843 text_anchor,
2844 }
2845 } else if let Some(excerpt) = prev_excerpt {
2846 let mut text_anchor = excerpt
2847 .range
2848 .context
2849 .end
2850 .bias(anchor.text_anchor.bias, &excerpt.buffer);
2851 if text_anchor
2852 .cmp(&excerpt.range.context.start, &excerpt.buffer)
2853 .is_lt()
2854 {
2855 text_anchor = excerpt.range.context.start;
2856 }
2857 Anchor {
2858 buffer_id: Some(excerpt.buffer_id),
2859 excerpt_id: excerpt.id,
2860 text_anchor,
2861 }
2862 } else if anchor.text_anchor.bias == Bias::Left {
2863 Anchor::min()
2864 } else {
2865 Anchor::max()
2866 };
2867 }
2868
2869 result.push((anchor_ix, anchor, kept_position));
2870 }
2871 }
2872 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self));
2873 result
2874 }
2875
2876 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
2877 self.anchor_at(position, Bias::Left)
2878 }
2879
2880 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
2881 self.anchor_at(position, Bias::Right)
2882 }
2883
2884 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
2885 let offset = position.to_offset(self);
2886 if let Some((excerpt_id, buffer_id, buffer)) = self.as_singleton() {
2887 return Anchor {
2888 buffer_id: Some(buffer_id),
2889 excerpt_id: *excerpt_id,
2890 text_anchor: buffer.anchor_at(offset, bias),
2891 };
2892 }
2893
2894 let mut cursor = self.excerpts.cursor::<(usize, Option<ExcerptId>)>();
2895 cursor.seek(&offset, Bias::Right, &());
2896 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
2897 cursor.prev(&());
2898 }
2899 if let Some(excerpt) = cursor.item() {
2900 let mut overshoot = offset.saturating_sub(cursor.start().0);
2901 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
2902 overshoot -= 1;
2903 bias = Bias::Right;
2904 }
2905
2906 let buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2907 let text_anchor =
2908 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
2909 Anchor {
2910 buffer_id: Some(excerpt.buffer_id),
2911 excerpt_id: excerpt.id,
2912 text_anchor,
2913 }
2914 } else if offset == 0 && bias == Bias::Left {
2915 Anchor::min()
2916 } else {
2917 Anchor::max()
2918 }
2919 }
2920
2921 /// Returns an anchor for the given excerpt and text anchor,
2922 /// returns None if the excerpt_id is no longer valid.
2923 pub fn anchor_in_excerpt(
2924 &self,
2925 excerpt_id: ExcerptId,
2926 text_anchor: text::Anchor,
2927 ) -> Option<Anchor> {
2928 let locator = self.excerpt_locator_for_id(excerpt_id);
2929 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2930 cursor.seek(locator, Bias::Left, &());
2931 if let Some(excerpt) = cursor.item() {
2932 if excerpt.id == excerpt_id {
2933 let text_anchor = excerpt.clip_anchor(text_anchor);
2934 drop(cursor);
2935 return Some(Anchor {
2936 buffer_id: Some(excerpt.buffer_id),
2937 excerpt_id,
2938 text_anchor,
2939 });
2940 }
2941 }
2942 None
2943 }
2944
2945 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
2946 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
2947 true
2948 } else if let Some(excerpt) = self.excerpt(anchor.excerpt_id) {
2949 excerpt.buffer.can_resolve(&anchor.text_anchor)
2950 } else {
2951 false
2952 }
2953 }
2954
2955 pub fn excerpts(
2956 &self,
2957 ) -> impl Iterator<Item = (ExcerptId, &BufferSnapshot, ExcerptRange<text::Anchor>)> {
2958 self.excerpts
2959 .iter()
2960 .map(|excerpt| (excerpt.id, &excerpt.buffer, excerpt.range.clone()))
2961 }
2962
2963 fn excerpts_for_range<T: ToOffset>(
2964 &self,
2965 range: Range<T>,
2966 ) -> impl Iterator<Item = (&Excerpt, usize)> + '_ {
2967 let range = range.start.to_offset(self)..range.end.to_offset(self);
2968
2969 let mut cursor = self.excerpts.cursor::<usize>();
2970 cursor.seek(&range.start, Bias::Right, &());
2971 cursor.prev(&());
2972
2973 iter::from_fn(move || {
2974 cursor.next(&());
2975 if cursor.start() < &range.end {
2976 cursor.item().map(|item| (item, *cursor.start()))
2977 } else {
2978 None
2979 }
2980 })
2981 }
2982
2983 pub fn excerpt_boundaries_in_range<R, T>(
2984 &self,
2985 range: R,
2986 ) -> impl Iterator<Item = ExcerptBoundary> + '_
2987 where
2988 R: RangeBounds<T>,
2989 T: ToOffset,
2990 {
2991 let start_offset;
2992 let start = match range.start_bound() {
2993 Bound::Included(start) => {
2994 start_offset = start.to_offset(self);
2995 Bound::Included(start_offset)
2996 }
2997 Bound::Excluded(start) => {
2998 start_offset = start.to_offset(self);
2999 Bound::Excluded(start_offset)
3000 }
3001 Bound::Unbounded => {
3002 start_offset = 0;
3003 Bound::Unbounded
3004 }
3005 };
3006 let end = match range.end_bound() {
3007 Bound::Included(end) => Bound::Included(end.to_offset(self)),
3008 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
3009 Bound::Unbounded => Bound::Unbounded,
3010 };
3011 let bounds = (start, end);
3012
3013 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
3014 cursor.seek(&start_offset, Bias::Right, &());
3015 if cursor.item().is_none() {
3016 cursor.prev(&());
3017 }
3018 if !bounds.contains(&cursor.start().0) {
3019 cursor.next(&());
3020 }
3021
3022 let mut prev_buffer_id = cursor.prev_item().map(|excerpt| excerpt.buffer_id);
3023 std::iter::from_fn(move || {
3024 if self.singleton {
3025 None
3026 } else if bounds.contains(&cursor.start().0) {
3027 let excerpt = cursor.item()?;
3028 let starts_new_buffer = Some(excerpt.buffer_id) != prev_buffer_id;
3029 let boundary = ExcerptBoundary {
3030 id: excerpt.id,
3031 row: cursor.start().1.row,
3032 buffer: excerpt.buffer.clone(),
3033 range: excerpt.range.clone(),
3034 starts_new_buffer,
3035 };
3036
3037 prev_buffer_id = Some(excerpt.buffer_id);
3038 cursor.next(&());
3039 Some(boundary)
3040 } else {
3041 None
3042 }
3043 })
3044 }
3045
3046 pub fn edit_count(&self) -> usize {
3047 self.edit_count
3048 }
3049
3050 pub fn parse_count(&self) -> usize {
3051 self.parse_count
3052 }
3053
3054 /// Returns the smallest enclosing bracket ranges containing the given range or
3055 /// None if no brackets contain range or the range is not contained in a single
3056 /// excerpt
3057 ///
3058 /// Can optionally pass a range_filter to filter the ranges of brackets to consider
3059 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
3060 &self,
3061 range: Range<T>,
3062 range_filter: Option<&dyn Fn(Range<usize>, Range<usize>) -> bool>,
3063 ) -> Option<(Range<usize>, Range<usize>)> {
3064 let range = range.start.to_offset(self)..range.end.to_offset(self);
3065 let excerpt = self.excerpt_containing(range.clone())?;
3066
3067 // Filter to ranges contained in the excerpt
3068 let range_filter = |open: Range<usize>, close: Range<usize>| -> bool {
3069 excerpt.contains_buffer_range(open.start..close.end)
3070 && range_filter.map_or(true, |filter| {
3071 filter(
3072 excerpt.map_range_from_buffer(open),
3073 excerpt.map_range_from_buffer(close),
3074 )
3075 })
3076 };
3077
3078 let (open, close) = excerpt.buffer().innermost_enclosing_bracket_ranges(
3079 excerpt.map_range_to_buffer(range),
3080 Some(&range_filter),
3081 )?;
3082
3083 Some((
3084 excerpt.map_range_from_buffer(open),
3085 excerpt.map_range_from_buffer(close),
3086 ))
3087 }
3088
3089 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
3090 /// not contained in a single excerpt
3091 pub fn enclosing_bracket_ranges<T: ToOffset>(
3092 &self,
3093 range: Range<T>,
3094 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + '_> {
3095 let range = range.start.to_offset(self)..range.end.to_offset(self);
3096 let excerpt = self.excerpt_containing(range.clone())?;
3097
3098 Some(
3099 excerpt
3100 .buffer()
3101 .enclosing_bracket_ranges(excerpt.map_range_to_buffer(range))
3102 .filter_map(move |(open, close)| {
3103 if excerpt.contains_buffer_range(open.start..close.end) {
3104 Some((
3105 excerpt.map_range_from_buffer(open),
3106 excerpt.map_range_from_buffer(close),
3107 ))
3108 } else {
3109 None
3110 }
3111 }),
3112 )
3113 }
3114
3115 /// Returns bracket range pairs overlapping the given `range` or returns None if the `range` is
3116 /// not contained in a single excerpt
3117 pub fn bracket_ranges<T: ToOffset>(
3118 &self,
3119 range: Range<T>,
3120 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + '_> {
3121 let range = range.start.to_offset(self)..range.end.to_offset(self);
3122 let excerpt = self.excerpt_containing(range.clone())?;
3123
3124 Some(
3125 excerpt
3126 .buffer()
3127 .bracket_ranges(excerpt.map_range_to_buffer(range))
3128 .filter_map(move |(start_bracket_range, close_bracket_range)| {
3129 let buffer_range = start_bracket_range.start..close_bracket_range.end;
3130 if excerpt.contains_buffer_range(buffer_range) {
3131 Some((
3132 excerpt.map_range_from_buffer(start_bracket_range),
3133 excerpt.map_range_from_buffer(close_bracket_range),
3134 ))
3135 } else {
3136 None
3137 }
3138 }),
3139 )
3140 }
3141
3142 pub fn redacted_ranges<'a, T: ToOffset>(
3143 &'a self,
3144 range: Range<T>,
3145 redaction_enabled: impl Fn(Option<&Arc<dyn File>>) -> bool + 'a,
3146 ) -> impl Iterator<Item = Range<usize>> + 'a {
3147 let range = range.start.to_offset(self)..range.end.to_offset(self);
3148 self.excerpts_for_range(range.clone())
3149 .filter_map(move |(excerpt, excerpt_offset)| {
3150 redaction_enabled(excerpt.buffer.file()).then(move || {
3151 let excerpt_buffer_start =
3152 excerpt.range.context.start.to_offset(&excerpt.buffer);
3153
3154 excerpt
3155 .buffer
3156 .redacted_ranges(excerpt.range.context.clone())
3157 .map(move |mut redacted_range| {
3158 // Re-base onto the excerpts coordinates in the multibuffer
3159 redacted_range.start = excerpt_offset
3160 + redacted_range.start.saturating_sub(excerpt_buffer_start);
3161 redacted_range.end = excerpt_offset
3162 + redacted_range.end.saturating_sub(excerpt_buffer_start);
3163
3164 redacted_range
3165 })
3166 .skip_while(move |redacted_range| redacted_range.end < range.start)
3167 .take_while(move |redacted_range| redacted_range.start < range.end)
3168 })
3169 })
3170 .flatten()
3171 }
3172
3173 pub fn runnable_ranges(
3174 &self,
3175 range: Range<Anchor>,
3176 ) -> impl Iterator<Item = language::RunnableRange> + '_ {
3177 let range = range.start.to_offset(self)..range.end.to_offset(self);
3178 self.excerpts_for_range(range.clone())
3179 .flat_map(move |(excerpt, excerpt_offset)| {
3180 let excerpt_buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
3181
3182 excerpt
3183 .buffer
3184 .runnable_ranges(excerpt.range.context.clone())
3185 .filter_map(move |mut runnable| {
3186 // Re-base onto the excerpts coordinates in the multibuffer
3187 //
3188 // The node matching our runnables query might partially overlap with
3189 // the provided range. If the run indicator is outside of excerpt bounds, do not actually show it.
3190 if runnable.run_range.start < excerpt_buffer_start {
3191 return None;
3192 }
3193 if language::ToPoint::to_point(&runnable.run_range.end, &excerpt.buffer).row
3194 > excerpt.max_buffer_row
3195 {
3196 return None;
3197 }
3198 runnable.run_range.start =
3199 excerpt_offset + runnable.run_range.start - excerpt_buffer_start;
3200 runnable.run_range.end =
3201 excerpt_offset + runnable.run_range.end - excerpt_buffer_start;
3202 Some(runnable)
3203 })
3204 .skip_while(move |runnable| runnable.run_range.end < range.start)
3205 .take_while(move |runnable| runnable.run_range.start < range.end)
3206 })
3207 }
3208
3209 pub fn diagnostics_update_count(&self) -> usize {
3210 self.diagnostics_update_count
3211 }
3212
3213 pub fn git_diff_update_count(&self) -> usize {
3214 self.git_diff_update_count
3215 }
3216
3217 pub fn trailing_excerpt_update_count(&self) -> usize {
3218 self.trailing_excerpt_update_count
3219 }
3220
3221 pub fn file_at<T: ToOffset>(&self, point: T) -> Option<&Arc<dyn File>> {
3222 self.point_to_buffer_offset(point)
3223 .and_then(|(buffer, _)| buffer.file())
3224 }
3225
3226 pub fn language_at<T: ToOffset>(&self, point: T) -> Option<&Arc<Language>> {
3227 self.point_to_buffer_offset(point)
3228 .and_then(|(buffer, offset)| buffer.language_at(offset))
3229 }
3230
3231 pub fn settings_at<'a, T: ToOffset>(
3232 &'a self,
3233 point: T,
3234 cx: &'a AppContext,
3235 ) -> &'a LanguageSettings {
3236 let mut language = None;
3237 let mut file = None;
3238 if let Some((buffer, offset)) = self.point_to_buffer_offset(point) {
3239 language = buffer.language_at(offset);
3240 file = buffer.file();
3241 }
3242 language_settings(language, file, cx)
3243 }
3244
3245 pub fn language_scope_at<T: ToOffset>(&self, point: T) -> Option<LanguageScope> {
3246 self.point_to_buffer_offset(point)
3247 .and_then(|(buffer, offset)| buffer.language_scope_at(offset))
3248 }
3249
3250 pub fn language_indent_size_at<T: ToOffset>(
3251 &self,
3252 position: T,
3253 cx: &AppContext,
3254 ) -> Option<IndentSize> {
3255 let (buffer_snapshot, offset) = self.point_to_buffer_offset(position)?;
3256 Some(buffer_snapshot.language_indent_size_at(offset, cx))
3257 }
3258
3259 pub fn is_dirty(&self) -> bool {
3260 self.is_dirty
3261 }
3262
3263 pub fn has_conflict(&self) -> bool {
3264 self.has_conflict
3265 }
3266
3267 pub fn has_diagnostics(&self) -> bool {
3268 self.excerpts
3269 .iter()
3270 .any(|excerpt| excerpt.buffer.has_diagnostics())
3271 }
3272
3273 pub fn diagnostic_group<'a, O>(
3274 &'a self,
3275 group_id: usize,
3276 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
3277 where
3278 O: text::FromAnchor + 'a,
3279 {
3280 self.as_singleton()
3281 .into_iter()
3282 .flat_map(move |(_, _, buffer)| buffer.diagnostic_group(group_id))
3283 }
3284
3285 pub fn diagnostics_in_range<'a, T, O>(
3286 &'a self,
3287 range: Range<T>,
3288 reversed: bool,
3289 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
3290 where
3291 T: 'a + ToOffset,
3292 O: 'a + text::FromAnchor + Ord,
3293 {
3294 self.as_singleton()
3295 .into_iter()
3296 .flat_map(move |(_, _, buffer)| {
3297 buffer.diagnostics_in_range(
3298 range.start.to_offset(self)..range.end.to_offset(self),
3299 reversed,
3300 )
3301 })
3302 }
3303
3304 pub fn has_git_diffs(&self) -> bool {
3305 for excerpt in self.excerpts.iter() {
3306 if excerpt.buffer.has_git_diff() {
3307 return true;
3308 }
3309 }
3310 false
3311 }
3312
3313 pub fn git_diff_hunks_in_range_rev(
3314 &self,
3315 row_range: Range<u32>,
3316 ) -> impl Iterator<Item = DiffHunk<u32>> + '_ {
3317 let mut cursor = self.excerpts.cursor::<Point>();
3318
3319 cursor.seek(&Point::new(row_range.end, 0), Bias::Left, &());
3320 if cursor.item().is_none() {
3321 cursor.prev(&());
3322 }
3323
3324 std::iter::from_fn(move || {
3325 let excerpt = cursor.item()?;
3326 let multibuffer_start = *cursor.start();
3327 let multibuffer_end = multibuffer_start + excerpt.text_summary.lines;
3328 if multibuffer_start.row >= row_range.end {
3329 return None;
3330 }
3331
3332 let mut buffer_start = excerpt.range.context.start;
3333 let mut buffer_end = excerpt.range.context.end;
3334 let excerpt_start_point = buffer_start.to_point(&excerpt.buffer);
3335 let excerpt_end_point = excerpt_start_point + excerpt.text_summary.lines;
3336
3337 if row_range.start > multibuffer_start.row {
3338 let buffer_start_point =
3339 excerpt_start_point + Point::new(row_range.start - multibuffer_start.row, 0);
3340 buffer_start = excerpt.buffer.anchor_before(buffer_start_point);
3341 }
3342
3343 if row_range.end < multibuffer_end.row {
3344 let buffer_end_point =
3345 excerpt_start_point + Point::new(row_range.end - multibuffer_start.row, 0);
3346 buffer_end = excerpt.buffer.anchor_before(buffer_end_point);
3347 }
3348
3349 let buffer_hunks = excerpt
3350 .buffer
3351 .git_diff_hunks_intersecting_range_rev(buffer_start..buffer_end)
3352 .map(move |hunk| {
3353 let start = multibuffer_start.row
3354 + hunk
3355 .associated_range
3356 .start
3357 .saturating_sub(excerpt_start_point.row);
3358 let end = multibuffer_start.row
3359 + hunk
3360 .associated_range
3361 .end
3362 .min(excerpt_end_point.row + 1)
3363 .saturating_sub(excerpt_start_point.row);
3364
3365 DiffHunk {
3366 associated_range: start..end,
3367 diff_base_byte_range: hunk.diff_base_byte_range.clone(),
3368 buffer_range: hunk.buffer_range.clone(),
3369 buffer_id: hunk.buffer_id,
3370 }
3371 });
3372
3373 cursor.prev(&());
3374
3375 Some(buffer_hunks)
3376 })
3377 .flatten()
3378 }
3379
3380 pub fn git_diff_hunks_in_range(
3381 &self,
3382 row_range: Range<u32>,
3383 ) -> impl Iterator<Item = DiffHunk<u32>> + '_ {
3384 let mut cursor = self.excerpts.cursor::<Point>();
3385
3386 cursor.seek(&Point::new(row_range.start, 0), Bias::Left, &());
3387
3388 std::iter::from_fn(move || {
3389 let excerpt = cursor.item()?;
3390 let multibuffer_start = *cursor.start();
3391 let multibuffer_end = multibuffer_start + excerpt.text_summary.lines;
3392 let mut buffer_start = excerpt.range.context.start;
3393 let mut buffer_end = excerpt.range.context.end;
3394
3395 let excerpt_rows = match multibuffer_start.row.cmp(&row_range.end) {
3396 cmp::Ordering::Less => {
3397 let excerpt_start_point = buffer_start.to_point(&excerpt.buffer);
3398 let excerpt_end_point = excerpt_start_point + excerpt.text_summary.lines;
3399
3400 if row_range.start > multibuffer_start.row {
3401 let buffer_start_point = excerpt_start_point
3402 + Point::new(row_range.start - multibuffer_start.row, 0);
3403 buffer_start = excerpt.buffer.anchor_before(buffer_start_point);
3404 }
3405
3406 if row_range.end < multibuffer_end.row {
3407 let buffer_end_point = excerpt_start_point
3408 + Point::new(row_range.end - multibuffer_start.row, 0);
3409 buffer_end = excerpt.buffer.anchor_before(buffer_end_point);
3410 }
3411 excerpt_start_point.row..excerpt_end_point.row
3412 }
3413 cmp::Ordering::Equal if row_range.end == 0 => {
3414 buffer_end = buffer_start;
3415 0..0
3416 }
3417 cmp::Ordering::Greater | cmp::Ordering::Equal => return None,
3418 };
3419
3420 let buffer_hunks = excerpt
3421 .buffer
3422 .git_diff_hunks_intersecting_range(buffer_start..buffer_end)
3423 .map(move |hunk| {
3424 let buffer_range = if excerpt_rows.start == 0 && excerpt_rows.end == 0 {
3425 0..1
3426 } else {
3427 let start = multibuffer_start.row
3428 + hunk
3429 .associated_range
3430 .start
3431 .saturating_sub(excerpt_rows.start);
3432 let end = multibuffer_start.row
3433 + hunk
3434 .associated_range
3435 .end
3436 .min(excerpt_rows.end + 1)
3437 .saturating_sub(excerpt_rows.start);
3438 start..end
3439 };
3440 DiffHunk {
3441 associated_range: buffer_range,
3442 diff_base_byte_range: hunk.diff_base_byte_range.clone(),
3443 buffer_range: hunk.buffer_range.clone(),
3444 buffer_id: hunk.buffer_id,
3445 }
3446 });
3447
3448 cursor.next(&());
3449
3450 Some(buffer_hunks)
3451 })
3452 .flatten()
3453 }
3454
3455 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
3456 let range = range.start.to_offset(self)..range.end.to_offset(self);
3457 let excerpt = self.excerpt_containing(range.clone())?;
3458
3459 let ancestor_buffer_range = excerpt
3460 .buffer()
3461 .range_for_syntax_ancestor(excerpt.map_range_to_buffer(range))?;
3462
3463 Some(excerpt.map_range_from_buffer(ancestor_buffer_range))
3464 }
3465
3466 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
3467 let (excerpt_id, _, buffer) = self.as_singleton()?;
3468 let outline = buffer.outline(theme)?;
3469 Some(Outline::new(
3470 outline
3471 .items
3472 .into_iter()
3473 .flat_map(|item| {
3474 Some(OutlineItem {
3475 depth: item.depth,
3476 range: self.anchor_in_excerpt(*excerpt_id, item.range.start)?
3477 ..self.anchor_in_excerpt(*excerpt_id, item.range.end)?,
3478 text: item.text,
3479 highlight_ranges: item.highlight_ranges,
3480 name_ranges: item.name_ranges,
3481 })
3482 })
3483 .collect(),
3484 ))
3485 }
3486
3487 pub fn symbols_containing<T: ToOffset>(
3488 &self,
3489 offset: T,
3490 theme: Option<&SyntaxTheme>,
3491 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
3492 let anchor = self.anchor_before(offset);
3493 let excerpt_id = anchor.excerpt_id;
3494 let excerpt = self.excerpt(excerpt_id)?;
3495 Some((
3496 excerpt.buffer_id,
3497 excerpt
3498 .buffer
3499 .symbols_containing(anchor.text_anchor, theme)
3500 .into_iter()
3501 .flatten()
3502 .flat_map(|item| {
3503 Some(OutlineItem {
3504 depth: item.depth,
3505 range: self.anchor_in_excerpt(excerpt_id, item.range.start)?
3506 ..self.anchor_in_excerpt(excerpt_id, item.range.end)?,
3507 text: item.text,
3508 highlight_ranges: item.highlight_ranges,
3509 name_ranges: item.name_ranges,
3510 })
3511 })
3512 .collect(),
3513 ))
3514 }
3515
3516 fn excerpt_locator_for_id(&self, id: ExcerptId) -> &Locator {
3517 if id == ExcerptId::min() {
3518 Locator::min_ref()
3519 } else if id == ExcerptId::max() {
3520 Locator::max_ref()
3521 } else {
3522 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>();
3523 cursor.seek(&id, Bias::Left, &());
3524 if let Some(entry) = cursor.item() {
3525 if entry.id == id {
3526 return &entry.locator;
3527 }
3528 }
3529 panic!("invalid excerpt id {:?}", id)
3530 }
3531 }
3532
3533 // Returns the locators referenced by the given excerpt ids, sorted by locator.
3534 fn excerpt_locators_for_ids(
3535 &self,
3536 ids: impl IntoIterator<Item = ExcerptId>,
3537 ) -> SmallVec<[Locator; 1]> {
3538 let mut sorted_ids = ids.into_iter().collect::<SmallVec<[_; 1]>>();
3539 sorted_ids.sort_unstable();
3540 let mut locators = SmallVec::new();
3541
3542 while sorted_ids.last() == Some(&ExcerptId::max()) {
3543 sorted_ids.pop();
3544 locators.push(Locator::max());
3545 }
3546
3547 let mut sorted_ids = sorted_ids.into_iter().dedup().peekable();
3548 if sorted_ids.peek() == Some(&ExcerptId::min()) {
3549 sorted_ids.next();
3550 locators.push(Locator::min());
3551 }
3552
3553 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>();
3554 for id in sorted_ids {
3555 if cursor.seek_forward(&id, Bias::Left, &()) {
3556 locators.push(cursor.item().unwrap().locator.clone());
3557 } else {
3558 panic!("invalid excerpt id {:?}", id);
3559 }
3560 }
3561
3562 locators.sort_unstable();
3563 locators
3564 }
3565
3566 pub fn buffer_id_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<BufferId> {
3567 Some(self.excerpt(excerpt_id)?.buffer_id)
3568 }
3569
3570 pub fn buffer_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<&BufferSnapshot> {
3571 Some(&self.excerpt(excerpt_id)?.buffer)
3572 }
3573
3574 fn excerpt(&self, excerpt_id: ExcerptId) -> Option<&Excerpt> {
3575 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
3576 let locator = self.excerpt_locator_for_id(excerpt_id);
3577 cursor.seek(&Some(locator), Bias::Left, &());
3578 if let Some(excerpt) = cursor.item() {
3579 if excerpt.id == excerpt_id {
3580 return Some(excerpt);
3581 }
3582 }
3583 None
3584 }
3585
3586 /// Returns the excerpt containing range and its offset start within the multibuffer or none if `range` spans multiple excerpts
3587 pub fn excerpt_containing<T: ToOffset>(&self, range: Range<T>) -> Option<MultiBufferExcerpt> {
3588 let range = range.start.to_offset(self)..range.end.to_offset(self);
3589
3590 let mut cursor = self.excerpts.cursor::<usize>();
3591 cursor.seek(&range.start, Bias::Right, &());
3592 let start_excerpt = cursor.item()?;
3593
3594 if range.start == range.end {
3595 return Some(MultiBufferExcerpt::new(start_excerpt, *cursor.start()));
3596 }
3597
3598 cursor.seek(&range.end, Bias::Right, &());
3599 let end_excerpt = cursor.item()?;
3600
3601 if start_excerpt.id == end_excerpt.id {
3602 Some(MultiBufferExcerpt::new(start_excerpt, *cursor.start()))
3603 } else {
3604 None
3605 }
3606 }
3607
3608 pub fn remote_selections_in_range<'a>(
3609 &'a self,
3610 range: &'a Range<Anchor>,
3611 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
3612 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
3613 let start_locator = self.excerpt_locator_for_id(range.start.excerpt_id);
3614 let end_locator = self.excerpt_locator_for_id(range.end.excerpt_id);
3615 cursor.seek(start_locator, Bias::Left, &());
3616 cursor
3617 .take_while(move |excerpt| excerpt.locator <= *end_locator)
3618 .flat_map(move |excerpt| {
3619 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
3620 if excerpt.id == range.start.excerpt_id {
3621 query_range.start = range.start.text_anchor;
3622 }
3623 if excerpt.id == range.end.excerpt_id {
3624 query_range.end = range.end.text_anchor;
3625 }
3626
3627 excerpt
3628 .buffer
3629 .remote_selections_in_range(query_range)
3630 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
3631 selections.map(move |selection| {
3632 let mut start = Anchor {
3633 buffer_id: Some(excerpt.buffer_id),
3634 excerpt_id: excerpt.id,
3635 text_anchor: selection.start,
3636 };
3637 let mut end = Anchor {
3638 buffer_id: Some(excerpt.buffer_id),
3639 excerpt_id: excerpt.id,
3640 text_anchor: selection.end,
3641 };
3642 if range.start.cmp(&start, self).is_gt() {
3643 start = range.start;
3644 }
3645 if range.end.cmp(&end, self).is_lt() {
3646 end = range.end;
3647 }
3648
3649 (
3650 replica_id,
3651 line_mode,
3652 cursor_shape,
3653 Selection {
3654 id: selection.id,
3655 start,
3656 end,
3657 reversed: selection.reversed,
3658 goal: selection.goal,
3659 },
3660 )
3661 })
3662 })
3663 })
3664 }
3665
3666 pub fn show_headers(&self) -> bool {
3667 self.show_headers
3668 }
3669}
3670
3671#[cfg(any(test, feature = "test-support"))]
3672impl MultiBufferSnapshot {
3673 pub fn random_byte_range(&self, start_offset: usize, rng: &mut impl rand::Rng) -> Range<usize> {
3674 let end = self.clip_offset(rng.gen_range(start_offset..=self.len()), Bias::Right);
3675 let start = self.clip_offset(rng.gen_range(start_offset..=end), Bias::Right);
3676 start..end
3677 }
3678}
3679
3680impl History {
3681 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
3682 self.transaction_depth += 1;
3683 if self.transaction_depth == 1 {
3684 let id = self.next_transaction_id.tick();
3685 self.undo_stack.push(Transaction {
3686 id,
3687 buffer_transactions: Default::default(),
3688 first_edit_at: now,
3689 last_edit_at: now,
3690 suppress_grouping: false,
3691 });
3692 Some(id)
3693 } else {
3694 None
3695 }
3696 }
3697
3698 fn end_transaction(
3699 &mut self,
3700 now: Instant,
3701 buffer_transactions: HashMap<BufferId, TransactionId>,
3702 ) -> bool {
3703 assert_ne!(self.transaction_depth, 0);
3704 self.transaction_depth -= 1;
3705 if self.transaction_depth == 0 {
3706 if buffer_transactions.is_empty() {
3707 self.undo_stack.pop();
3708 false
3709 } else {
3710 self.redo_stack.clear();
3711 let transaction = self.undo_stack.last_mut().unwrap();
3712 transaction.last_edit_at = now;
3713 for (buffer_id, transaction_id) in buffer_transactions {
3714 transaction
3715 .buffer_transactions
3716 .entry(buffer_id)
3717 .or_insert(transaction_id);
3718 }
3719 true
3720 }
3721 } else {
3722 false
3723 }
3724 }
3725
3726 fn push_transaction<'a, T>(
3727 &mut self,
3728 buffer_transactions: T,
3729 now: Instant,
3730 cx: &mut ModelContext<MultiBuffer>,
3731 ) where
3732 T: IntoIterator<Item = (&'a Model<Buffer>, &'a language::Transaction)>,
3733 {
3734 assert_eq!(self.transaction_depth, 0);
3735 let transaction = Transaction {
3736 id: self.next_transaction_id.tick(),
3737 buffer_transactions: buffer_transactions
3738 .into_iter()
3739 .map(|(buffer, transaction)| (buffer.read(cx).remote_id(), transaction.id))
3740 .collect(),
3741 first_edit_at: now,
3742 last_edit_at: now,
3743 suppress_grouping: false,
3744 };
3745 if !transaction.buffer_transactions.is_empty() {
3746 self.undo_stack.push(transaction);
3747 self.redo_stack.clear();
3748 }
3749 }
3750
3751 fn finalize_last_transaction(&mut self) {
3752 if let Some(transaction) = self.undo_stack.last_mut() {
3753 transaction.suppress_grouping = true;
3754 }
3755 }
3756
3757 fn forget(&mut self, transaction_id: TransactionId) -> Option<Transaction> {
3758 if let Some(ix) = self
3759 .undo_stack
3760 .iter()
3761 .rposition(|transaction| transaction.id == transaction_id)
3762 {
3763 Some(self.undo_stack.remove(ix))
3764 } else if let Some(ix) = self
3765 .redo_stack
3766 .iter()
3767 .rposition(|transaction| transaction.id == transaction_id)
3768 {
3769 Some(self.redo_stack.remove(ix))
3770 } else {
3771 None
3772 }
3773 }
3774
3775 fn transaction_mut(&mut self, transaction_id: TransactionId) -> Option<&mut Transaction> {
3776 self.undo_stack
3777 .iter_mut()
3778 .find(|transaction| transaction.id == transaction_id)
3779 .or_else(|| {
3780 self.redo_stack
3781 .iter_mut()
3782 .find(|transaction| transaction.id == transaction_id)
3783 })
3784 }
3785
3786 fn pop_undo(&mut self) -> Option<&mut Transaction> {
3787 assert_eq!(self.transaction_depth, 0);
3788 if let Some(transaction) = self.undo_stack.pop() {
3789 self.redo_stack.push(transaction);
3790 self.redo_stack.last_mut()
3791 } else {
3792 None
3793 }
3794 }
3795
3796 fn pop_redo(&mut self) -> Option<&mut Transaction> {
3797 assert_eq!(self.transaction_depth, 0);
3798 if let Some(transaction) = self.redo_stack.pop() {
3799 self.undo_stack.push(transaction);
3800 self.undo_stack.last_mut()
3801 } else {
3802 None
3803 }
3804 }
3805
3806 fn remove_from_undo(&mut self, transaction_id: TransactionId) -> Option<&Transaction> {
3807 let ix = self
3808 .undo_stack
3809 .iter()
3810 .rposition(|transaction| transaction.id == transaction_id)?;
3811 let transaction = self.undo_stack.remove(ix);
3812 self.redo_stack.push(transaction);
3813 self.redo_stack.last()
3814 }
3815
3816 fn group(&mut self) -> Option<TransactionId> {
3817 let mut count = 0;
3818 let mut transactions = self.undo_stack.iter();
3819 if let Some(mut transaction) = transactions.next_back() {
3820 while let Some(prev_transaction) = transactions.next_back() {
3821 if !prev_transaction.suppress_grouping
3822 && transaction.first_edit_at - prev_transaction.last_edit_at
3823 <= self.group_interval
3824 {
3825 transaction = prev_transaction;
3826 count += 1;
3827 } else {
3828 break;
3829 }
3830 }
3831 }
3832 self.group_trailing(count)
3833 }
3834
3835 fn group_until(&mut self, transaction_id: TransactionId) {
3836 let mut count = 0;
3837 for transaction in self.undo_stack.iter().rev() {
3838 if transaction.id == transaction_id {
3839 self.group_trailing(count);
3840 break;
3841 } else if transaction.suppress_grouping {
3842 break;
3843 } else {
3844 count += 1;
3845 }
3846 }
3847 }
3848
3849 fn group_trailing(&mut self, n: usize) -> Option<TransactionId> {
3850 let new_len = self.undo_stack.len() - n;
3851 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
3852 if let Some(last_transaction) = transactions_to_keep.last_mut() {
3853 if let Some(transaction) = transactions_to_merge.last() {
3854 last_transaction.last_edit_at = transaction.last_edit_at;
3855 }
3856 for to_merge in transactions_to_merge {
3857 for (buffer_id, transaction_id) in &to_merge.buffer_transactions {
3858 last_transaction
3859 .buffer_transactions
3860 .entry(*buffer_id)
3861 .or_insert(*transaction_id);
3862 }
3863 }
3864 }
3865
3866 self.undo_stack.truncate(new_len);
3867 self.undo_stack.last().map(|t| t.id)
3868 }
3869}
3870
3871impl Excerpt {
3872 fn new(
3873 id: ExcerptId,
3874 locator: Locator,
3875 buffer_id: BufferId,
3876 buffer: BufferSnapshot,
3877 range: ExcerptRange<text::Anchor>,
3878 has_trailing_newline: bool,
3879 ) -> Self {
3880 Excerpt {
3881 id,
3882 locator,
3883 max_buffer_row: range.context.end.to_point(&buffer).row,
3884 text_summary: buffer
3885 .text_summary_for_range::<TextSummary, _>(range.context.to_offset(&buffer)),
3886 buffer_id,
3887 buffer,
3888 range,
3889 has_trailing_newline,
3890 }
3891 }
3892
3893 fn chunks_in_range(&self, range: Range<usize>, language_aware: bool) -> ExcerptChunks {
3894 let content_start = self.range.context.start.to_offset(&self.buffer);
3895 let chunks_start = content_start + range.start;
3896 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
3897
3898 let footer_height = if self.has_trailing_newline
3899 && range.start <= self.text_summary.len
3900 && range.end > self.text_summary.len
3901 {
3902 1
3903 } else {
3904 0
3905 };
3906
3907 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
3908
3909 ExcerptChunks {
3910 content_chunks,
3911 footer_height,
3912 }
3913 }
3914
3915 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
3916 let content_start = self.range.context.start.to_offset(&self.buffer);
3917 let bytes_start = content_start + range.start;
3918 let bytes_end = content_start + cmp::min(range.end, self.text_summary.len);
3919 let footer_height = if self.has_trailing_newline
3920 && range.start <= self.text_summary.len
3921 && range.end > self.text_summary.len
3922 {
3923 1
3924 } else {
3925 0
3926 };
3927 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
3928
3929 ExcerptBytes {
3930 content_bytes,
3931 padding_height: footer_height,
3932 reversed: false,
3933 }
3934 }
3935
3936 fn reversed_bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
3937 let content_start = self.range.context.start.to_offset(&self.buffer);
3938 let bytes_start = content_start + range.start;
3939 let bytes_end = content_start + cmp::min(range.end, self.text_summary.len);
3940 let footer_height = if self.has_trailing_newline
3941 && range.start <= self.text_summary.len
3942 && range.end > self.text_summary.len
3943 {
3944 1
3945 } else {
3946 0
3947 };
3948 let content_bytes = self.buffer.reversed_bytes_in_range(bytes_start..bytes_end);
3949
3950 ExcerptBytes {
3951 content_bytes,
3952 padding_height: footer_height,
3953 reversed: true,
3954 }
3955 }
3956
3957 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
3958 if text_anchor
3959 .cmp(&self.range.context.start, &self.buffer)
3960 .is_lt()
3961 {
3962 self.range.context.start
3963 } else if text_anchor
3964 .cmp(&self.range.context.end, &self.buffer)
3965 .is_gt()
3966 {
3967 self.range.context.end
3968 } else {
3969 text_anchor
3970 }
3971 }
3972
3973 fn contains(&self, anchor: &Anchor) -> bool {
3974 Some(self.buffer_id) == anchor.buffer_id
3975 && self
3976 .range
3977 .context
3978 .start
3979 .cmp(&anchor.text_anchor, &self.buffer)
3980 .is_le()
3981 && self
3982 .range
3983 .context
3984 .end
3985 .cmp(&anchor.text_anchor, &self.buffer)
3986 .is_ge()
3987 }
3988
3989 /// The [`Excerpt`]'s start offset in its [`Buffer`]
3990 fn buffer_start_offset(&self) -> usize {
3991 self.range.context.start.to_offset(&self.buffer)
3992 }
3993
3994 /// The [`Excerpt`]'s end offset in its [`Buffer`]
3995 fn buffer_end_offset(&self) -> usize {
3996 self.buffer_start_offset() + self.text_summary.len
3997 }
3998}
3999
4000impl<'a> MultiBufferExcerpt<'a> {
4001 fn new(excerpt: &'a Excerpt, excerpt_offset: usize) -> Self {
4002 MultiBufferExcerpt {
4003 excerpt,
4004 excerpt_offset,
4005 }
4006 }
4007
4008 pub fn buffer(&self) -> &'a BufferSnapshot {
4009 &self.excerpt.buffer
4010 }
4011
4012 /// Maps an offset within the [`MultiBuffer`] to an offset within the [`Buffer`]
4013 pub fn map_offset_to_buffer(&self, offset: usize) -> usize {
4014 self.excerpt.buffer_start_offset() + offset.saturating_sub(self.excerpt_offset)
4015 }
4016
4017 /// Maps a range within the [`MultiBuffer`] to a range within the [`Buffer`]
4018 pub fn map_range_to_buffer(&self, range: Range<usize>) -> Range<usize> {
4019 self.map_offset_to_buffer(range.start)..self.map_offset_to_buffer(range.end)
4020 }
4021
4022 /// Map an offset within the [`Buffer`] to an offset within the [`MultiBuffer`]
4023 pub fn map_offset_from_buffer(&self, buffer_offset: usize) -> usize {
4024 let mut buffer_offset_in_excerpt =
4025 buffer_offset.saturating_sub(self.excerpt.buffer_start_offset());
4026 buffer_offset_in_excerpt =
4027 cmp::min(buffer_offset_in_excerpt, self.excerpt.text_summary.len);
4028
4029 self.excerpt_offset + buffer_offset_in_excerpt
4030 }
4031
4032 /// Map a range within the [`Buffer`] to a range within the [`MultiBuffer`]
4033 pub fn map_range_from_buffer(&self, buffer_range: Range<usize>) -> Range<usize> {
4034 self.map_offset_from_buffer(buffer_range.start)
4035 ..self.map_offset_from_buffer(buffer_range.end)
4036 }
4037
4038 /// Returns true if the entirety of the given range is in the buffer's excerpt
4039 pub fn contains_buffer_range(&self, range: Range<usize>) -> bool {
4040 range.start >= self.excerpt.buffer_start_offset()
4041 && range.end <= self.excerpt.buffer_end_offset()
4042 }
4043}
4044
4045impl ExcerptId {
4046 pub fn min() -> Self {
4047 Self(0)
4048 }
4049
4050 pub fn max() -> Self {
4051 Self(usize::MAX)
4052 }
4053
4054 pub fn to_proto(&self) -> u64 {
4055 self.0 as _
4056 }
4057
4058 pub fn from_proto(proto: u64) -> Self {
4059 Self(proto as _)
4060 }
4061
4062 pub fn cmp(&self, other: &Self, snapshot: &MultiBufferSnapshot) -> cmp::Ordering {
4063 let a = snapshot.excerpt_locator_for_id(*self);
4064 let b = snapshot.excerpt_locator_for_id(*other);
4065 a.cmp(b).then_with(|| self.0.cmp(&other.0))
4066 }
4067}
4068
4069impl Into<usize> for ExcerptId {
4070 fn into(self) -> usize {
4071 self.0
4072 }
4073}
4074
4075impl fmt::Debug for Excerpt {
4076 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
4077 f.debug_struct("Excerpt")
4078 .field("id", &self.id)
4079 .field("locator", &self.locator)
4080 .field("buffer_id", &self.buffer_id)
4081 .field("range", &self.range)
4082 .field("text_summary", &self.text_summary)
4083 .field("has_trailing_newline", &self.has_trailing_newline)
4084 .finish()
4085 }
4086}
4087
4088impl sum_tree::Item for Excerpt {
4089 type Summary = ExcerptSummary;
4090
4091 fn summary(&self) -> Self::Summary {
4092 let mut text = self.text_summary.clone();
4093 if self.has_trailing_newline {
4094 text += TextSummary::from("\n");
4095 }
4096 ExcerptSummary {
4097 excerpt_id: self.id,
4098 excerpt_locator: self.locator.clone(),
4099 max_buffer_row: self.max_buffer_row,
4100 text,
4101 }
4102 }
4103}
4104
4105impl sum_tree::Item for ExcerptIdMapping {
4106 type Summary = ExcerptId;
4107
4108 fn summary(&self) -> Self::Summary {
4109 self.id
4110 }
4111}
4112
4113impl sum_tree::KeyedItem for ExcerptIdMapping {
4114 type Key = ExcerptId;
4115
4116 fn key(&self) -> Self::Key {
4117 self.id
4118 }
4119}
4120
4121impl sum_tree::Summary for ExcerptId {
4122 type Context = ();
4123
4124 fn add_summary(&mut self, other: &Self, _: &()) {
4125 *self = *other;
4126 }
4127}
4128
4129impl sum_tree::Summary for ExcerptSummary {
4130 type Context = ();
4131
4132 fn add_summary(&mut self, summary: &Self, _: &()) {
4133 debug_assert!(summary.excerpt_locator > self.excerpt_locator);
4134 self.excerpt_locator = summary.excerpt_locator.clone();
4135 self.text.add_summary(&summary.text, &());
4136 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
4137 }
4138}
4139
4140impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
4141 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4142 *self += &summary.text;
4143 }
4144}
4145
4146impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
4147 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4148 *self += summary.text.len;
4149 }
4150}
4151
4152impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
4153 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
4154 Ord::cmp(self, &cursor_location.text.len)
4155 }
4156}
4157
4158impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, Option<&'a Locator>> for Locator {
4159 fn cmp(&self, cursor_location: &Option<&'a Locator>, _: &()) -> cmp::Ordering {
4160 Ord::cmp(&Some(self), cursor_location)
4161 }
4162}
4163
4164impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Locator {
4165 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
4166 Ord::cmp(self, &cursor_location.excerpt_locator)
4167 }
4168}
4169
4170impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for OffsetUtf16 {
4171 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4172 *self += summary.text.len_utf16;
4173 }
4174}
4175
4176impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
4177 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4178 *self += summary.text.lines;
4179 }
4180}
4181
4182impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
4183 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4184 *self += summary.text.lines_utf16()
4185 }
4186}
4187
4188impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a Locator> {
4189 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4190 *self = Some(&summary.excerpt_locator);
4191 }
4192}
4193
4194impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<ExcerptId> {
4195 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
4196 *self = Some(summary.excerpt_id);
4197 }
4198}
4199
4200impl<'a> MultiBufferRows<'a> {
4201 pub fn seek(&mut self, row: u32) {
4202 self.buffer_row_range = 0..0;
4203
4204 self.excerpts
4205 .seek_forward(&Point::new(row, 0), Bias::Right, &());
4206 if self.excerpts.item().is_none() {
4207 self.excerpts.prev(&());
4208
4209 if self.excerpts.item().is_none() && row == 0 {
4210 self.buffer_row_range = 0..1;
4211 return;
4212 }
4213 }
4214
4215 if let Some(excerpt) = self.excerpts.item() {
4216 let overshoot = row - self.excerpts.start().row;
4217 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer).row;
4218 self.buffer_row_range.start = excerpt_start + overshoot;
4219 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
4220 }
4221 }
4222}
4223
4224impl<'a> Iterator for MultiBufferRows<'a> {
4225 type Item = Option<u32>;
4226
4227 fn next(&mut self) -> Option<Self::Item> {
4228 loop {
4229 if !self.buffer_row_range.is_empty() {
4230 let row = Some(self.buffer_row_range.start);
4231 self.buffer_row_range.start += 1;
4232 return Some(row);
4233 }
4234 self.excerpts.item()?;
4235 self.excerpts.next(&());
4236 let excerpt = self.excerpts.item()?;
4237 self.buffer_row_range.start = excerpt.range.context.start.to_point(&excerpt.buffer).row;
4238 self.buffer_row_range.end =
4239 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
4240 }
4241 }
4242}
4243
4244impl<'a> MultiBufferChunks<'a> {
4245 pub fn offset(&self) -> usize {
4246 self.range.start
4247 }
4248
4249 pub fn seek(&mut self, offset: usize) {
4250 self.range.start = offset;
4251 self.excerpts.seek(&offset, Bias::Right, &());
4252 if let Some(excerpt) = self.excerpts.item() {
4253 self.excerpt_chunks = Some(excerpt.chunks_in_range(
4254 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
4255 self.language_aware,
4256 ));
4257 } else {
4258 self.excerpt_chunks = None;
4259 }
4260 }
4261}
4262
4263impl<'a> Iterator for MultiBufferChunks<'a> {
4264 type Item = Chunk<'a>;
4265
4266 fn next(&mut self) -> Option<Self::Item> {
4267 if self.range.is_empty() {
4268 None
4269 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
4270 self.range.start += chunk.text.len();
4271 Some(chunk)
4272 } else {
4273 self.excerpts.next(&());
4274 let excerpt = self.excerpts.item()?;
4275 self.excerpt_chunks = Some(excerpt.chunks_in_range(
4276 0..self.range.end - self.excerpts.start(),
4277 self.language_aware,
4278 ));
4279 self.next()
4280 }
4281 }
4282}
4283
4284impl<'a> MultiBufferBytes<'a> {
4285 fn consume(&mut self, len: usize) {
4286 self.range.start += len;
4287 self.chunk = &self.chunk[len..];
4288
4289 if !self.range.is_empty() && self.chunk.is_empty() {
4290 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
4291 self.chunk = chunk;
4292 } else {
4293 self.excerpts.next(&());
4294 if let Some(excerpt) = self.excerpts.item() {
4295 let mut excerpt_bytes =
4296 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
4297 self.chunk = excerpt_bytes.next().unwrap();
4298 self.excerpt_bytes = Some(excerpt_bytes);
4299 }
4300 }
4301 }
4302 }
4303}
4304
4305impl<'a> Iterator for MultiBufferBytes<'a> {
4306 type Item = &'a [u8];
4307
4308 fn next(&mut self) -> Option<Self::Item> {
4309 let chunk = self.chunk;
4310 if chunk.is_empty() {
4311 None
4312 } else {
4313 self.consume(chunk.len());
4314 Some(chunk)
4315 }
4316 }
4317}
4318
4319impl<'a> io::Read for MultiBufferBytes<'a> {
4320 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
4321 let len = cmp::min(buf.len(), self.chunk.len());
4322 buf[..len].copy_from_slice(&self.chunk[..len]);
4323 if len > 0 {
4324 self.consume(len);
4325 }
4326 Ok(len)
4327 }
4328}
4329
4330impl<'a> ReversedMultiBufferBytes<'a> {
4331 fn consume(&mut self, len: usize) {
4332 self.range.end -= len;
4333 self.chunk = &self.chunk[..self.chunk.len() - len];
4334
4335 if !self.range.is_empty() && self.chunk.is_empty() {
4336 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
4337 self.chunk = chunk;
4338 } else {
4339 self.excerpts.prev(&());
4340 if let Some(excerpt) = self.excerpts.item() {
4341 let mut excerpt_bytes = excerpt.reversed_bytes_in_range(
4342 self.range.start.saturating_sub(*self.excerpts.start())..usize::MAX,
4343 );
4344 self.chunk = excerpt_bytes.next().unwrap();
4345 self.excerpt_bytes = Some(excerpt_bytes);
4346 }
4347 }
4348 } else {
4349 }
4350 }
4351}
4352
4353impl<'a> io::Read for ReversedMultiBufferBytes<'a> {
4354 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
4355 let len = cmp::min(buf.len(), self.chunk.len());
4356 buf[..len].copy_from_slice(&self.chunk[..len]);
4357 buf[..len].reverse();
4358 if len > 0 {
4359 self.consume(len);
4360 }
4361 Ok(len)
4362 }
4363}
4364impl<'a> Iterator for ExcerptBytes<'a> {
4365 type Item = &'a [u8];
4366
4367 fn next(&mut self) -> Option<Self::Item> {
4368 if self.reversed && self.padding_height > 0 {
4369 let result = &NEWLINES[..self.padding_height];
4370 self.padding_height = 0;
4371 return Some(result);
4372 }
4373
4374 if let Some(chunk) = self.content_bytes.next() {
4375 if !chunk.is_empty() {
4376 return Some(chunk);
4377 }
4378 }
4379
4380 if self.padding_height > 0 {
4381 let result = &NEWLINES[..self.padding_height];
4382 self.padding_height = 0;
4383 return Some(result);
4384 }
4385
4386 None
4387 }
4388}
4389
4390impl<'a> Iterator for ExcerptChunks<'a> {
4391 type Item = Chunk<'a>;
4392
4393 fn next(&mut self) -> Option<Self::Item> {
4394 if let Some(chunk) = self.content_chunks.next() {
4395 return Some(chunk);
4396 }
4397
4398 if self.footer_height > 0 {
4399 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
4400 self.footer_height = 0;
4401 return Some(Chunk {
4402 text,
4403 ..Default::default()
4404 });
4405 }
4406
4407 None
4408 }
4409}
4410
4411impl ToOffset for Point {
4412 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
4413 snapshot.point_to_offset(*self)
4414 }
4415}
4416
4417impl ToOffset for usize {
4418 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
4419 assert!(*self <= snapshot.len(), "offset is out of range");
4420 *self
4421 }
4422}
4423
4424impl ToOffset for OffsetUtf16 {
4425 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
4426 snapshot.offset_utf16_to_offset(*self)
4427 }
4428}
4429
4430impl ToOffset for PointUtf16 {
4431 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
4432 snapshot.point_utf16_to_offset(*self)
4433 }
4434}
4435
4436impl ToOffsetUtf16 for OffsetUtf16 {
4437 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
4438 *self
4439 }
4440}
4441
4442impl ToOffsetUtf16 for usize {
4443 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
4444 snapshot.offset_to_offset_utf16(*self)
4445 }
4446}
4447
4448impl ToPoint for usize {
4449 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
4450 snapshot.offset_to_point(*self)
4451 }
4452}
4453
4454impl ToPoint for Point {
4455 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
4456 *self
4457 }
4458}
4459
4460impl ToPointUtf16 for usize {
4461 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
4462 snapshot.offset_to_point_utf16(*self)
4463 }
4464}
4465
4466impl ToPointUtf16 for Point {
4467 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
4468 snapshot.point_to_point_utf16(*self)
4469 }
4470}
4471
4472impl ToPointUtf16 for PointUtf16 {
4473 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
4474 *self
4475 }
4476}
4477
4478fn build_excerpt_ranges<T>(
4479 buffer: &BufferSnapshot,
4480 ranges: &[Range<T>],
4481 context_line_count: u32,
4482) -> (Vec<ExcerptRange<Point>>, Vec<usize>)
4483where
4484 T: text::ToPoint,
4485{
4486 let max_point = buffer.max_point();
4487 let mut range_counts = Vec::new();
4488 let mut excerpt_ranges = Vec::new();
4489 let mut range_iter = ranges
4490 .iter()
4491 .map(|range| range.start.to_point(buffer)..range.end.to_point(buffer))
4492 .peekable();
4493 while let Some(range) = range_iter.next() {
4494 let excerpt_start = Point::new(range.start.row.saturating_sub(context_line_count), 0);
4495 // These + 1s ensure that we select the whole next line
4496 let mut excerpt_end = Point::new(range.end.row + 1 + context_line_count, 0).min(max_point);
4497
4498 let mut ranges_in_excerpt = 1;
4499
4500 while let Some(next_range) = range_iter.peek() {
4501 if next_range.start.row <= excerpt_end.row + context_line_count {
4502 excerpt_end =
4503 Point::new(next_range.end.row + 1 + context_line_count, 0).min(max_point);
4504 ranges_in_excerpt += 1;
4505 range_iter.next();
4506 } else {
4507 break;
4508 }
4509 }
4510
4511 excerpt_ranges.push(ExcerptRange {
4512 context: excerpt_start..excerpt_end,
4513 primary: Some(range),
4514 });
4515 range_counts.push(ranges_in_excerpt);
4516 }
4517
4518 (excerpt_ranges, range_counts)
4519}
4520
4521#[cfg(test)]
4522mod tests {
4523 use super::*;
4524 use futures::StreamExt;
4525 use gpui::{AppContext, Context, TestAppContext};
4526 use language::{Buffer, Rope};
4527 use parking_lot::RwLock;
4528 use rand::prelude::*;
4529 use settings::SettingsStore;
4530 use std::env;
4531 use util::test::sample_text;
4532
4533 #[ctor::ctor]
4534 fn init_logger() {
4535 if std::env::var("RUST_LOG").is_ok() {
4536 env_logger::init();
4537 }
4538 }
4539
4540 #[gpui::test]
4541 fn test_singleton(cx: &mut AppContext) {
4542 let buffer = cx.new_model(|cx| Buffer::local(sample_text(6, 6, 'a'), cx));
4543 let multibuffer = cx.new_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
4544
4545 let snapshot = multibuffer.read(cx).snapshot(cx);
4546 assert_eq!(snapshot.text(), buffer.read(cx).text());
4547
4548 assert_eq!(
4549 snapshot.buffer_rows(0).collect::<Vec<_>>(),
4550 (0..buffer.read(cx).row_count())
4551 .map(Some)
4552 .collect::<Vec<_>>()
4553 );
4554
4555 buffer.update(cx, |buffer, cx| buffer.edit([(1..3, "XXX\n")], None, cx));
4556 let snapshot = multibuffer.read(cx).snapshot(cx);
4557
4558 assert_eq!(snapshot.text(), buffer.read(cx).text());
4559 assert_eq!(
4560 snapshot.buffer_rows(0).collect::<Vec<_>>(),
4561 (0..buffer.read(cx).row_count())
4562 .map(Some)
4563 .collect::<Vec<_>>()
4564 );
4565 }
4566
4567 #[gpui::test]
4568 fn test_remote(cx: &mut AppContext) {
4569 let host_buffer = cx.new_model(|cx| Buffer::local("a", cx));
4570 let guest_buffer = cx.new_model(|cx| {
4571 let state = host_buffer.read(cx).to_proto();
4572 let ops = cx
4573 .background_executor()
4574 .block(host_buffer.read(cx).serialize_ops(None, cx));
4575 let mut buffer = Buffer::from_proto(1, Capability::ReadWrite, state, None).unwrap();
4576 buffer
4577 .apply_ops(
4578 ops.into_iter()
4579 .map(|op| language::proto::deserialize_operation(op).unwrap()),
4580 cx,
4581 )
4582 .unwrap();
4583 buffer
4584 });
4585 let multibuffer = cx.new_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
4586 let snapshot = multibuffer.read(cx).snapshot(cx);
4587 assert_eq!(snapshot.text(), "a");
4588
4589 guest_buffer.update(cx, |buffer, cx| buffer.edit([(1..1, "b")], None, cx));
4590 let snapshot = multibuffer.read(cx).snapshot(cx);
4591 assert_eq!(snapshot.text(), "ab");
4592
4593 guest_buffer.update(cx, |buffer, cx| buffer.edit([(2..2, "c")], None, cx));
4594 let snapshot = multibuffer.read(cx).snapshot(cx);
4595 assert_eq!(snapshot.text(), "abc");
4596 }
4597
4598 #[gpui::test]
4599 fn test_excerpt_boundaries_and_clipping(cx: &mut AppContext) {
4600 let buffer_1 = cx.new_model(|cx| Buffer::local(sample_text(6, 6, 'a'), cx));
4601 let buffer_2 = cx.new_model(|cx| Buffer::local(sample_text(6, 6, 'g'), cx));
4602 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
4603
4604 let events = Arc::new(RwLock::new(Vec::<Event>::new()));
4605 multibuffer.update(cx, |_, cx| {
4606 let events = events.clone();
4607 cx.subscribe(&multibuffer, move |_, _, event, _| {
4608 if let Event::Edited { .. } = event {
4609 events.write().push(event.clone())
4610 }
4611 })
4612 .detach();
4613 });
4614
4615 let subscription = multibuffer.update(cx, |multibuffer, cx| {
4616 let subscription = multibuffer.subscribe();
4617 multibuffer.push_excerpts(
4618 buffer_1.clone(),
4619 [ExcerptRange {
4620 context: Point::new(1, 2)..Point::new(2, 5),
4621 primary: None,
4622 }],
4623 cx,
4624 );
4625 assert_eq!(
4626 subscription.consume().into_inner(),
4627 [Edit {
4628 old: 0..0,
4629 new: 0..10
4630 }]
4631 );
4632
4633 multibuffer.push_excerpts(
4634 buffer_1.clone(),
4635 [ExcerptRange {
4636 context: Point::new(3, 3)..Point::new(4, 4),
4637 primary: None,
4638 }],
4639 cx,
4640 );
4641 multibuffer.push_excerpts(
4642 buffer_2.clone(),
4643 [ExcerptRange {
4644 context: Point::new(3, 1)..Point::new(3, 3),
4645 primary: None,
4646 }],
4647 cx,
4648 );
4649 assert_eq!(
4650 subscription.consume().into_inner(),
4651 [Edit {
4652 old: 10..10,
4653 new: 10..22
4654 }]
4655 );
4656
4657 subscription
4658 });
4659
4660 // Adding excerpts emits an edited event.
4661 assert_eq!(
4662 events.read().as_slice(),
4663 &[
4664 Event::Edited {
4665 singleton_buffer_edited: false
4666 },
4667 Event::Edited {
4668 singleton_buffer_edited: false
4669 },
4670 Event::Edited {
4671 singleton_buffer_edited: false
4672 }
4673 ]
4674 );
4675
4676 let snapshot = multibuffer.read(cx).snapshot(cx);
4677 assert_eq!(
4678 snapshot.text(),
4679 concat!(
4680 "bbbb\n", // Preserve newlines
4681 "ccccc\n", //
4682 "ddd\n", //
4683 "eeee\n", //
4684 "jj" //
4685 )
4686 );
4687 assert_eq!(
4688 snapshot.buffer_rows(0).collect::<Vec<_>>(),
4689 [Some(1), Some(2), Some(3), Some(4), Some(3)]
4690 );
4691 assert_eq!(
4692 snapshot.buffer_rows(2).collect::<Vec<_>>(),
4693 [Some(3), Some(4), Some(3)]
4694 );
4695 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
4696 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
4697
4698 assert_eq!(
4699 boundaries_in_range(Point::new(0, 0)..Point::new(4, 2), &snapshot),
4700 &[
4701 (0, "bbbb\nccccc".to_string(), true),
4702 (2, "ddd\neeee".to_string(), false),
4703 (4, "jj".to_string(), true),
4704 ]
4705 );
4706 assert_eq!(
4707 boundaries_in_range(Point::new(0, 0)..Point::new(2, 0), &snapshot),
4708 &[(0, "bbbb\nccccc".to_string(), true)]
4709 );
4710 assert_eq!(
4711 boundaries_in_range(Point::new(1, 0)..Point::new(1, 5), &snapshot),
4712 &[]
4713 );
4714 assert_eq!(
4715 boundaries_in_range(Point::new(1, 0)..Point::new(2, 0), &snapshot),
4716 &[]
4717 );
4718 assert_eq!(
4719 boundaries_in_range(Point::new(1, 0)..Point::new(4, 0), &snapshot),
4720 &[(2, "ddd\neeee".to_string(), false)]
4721 );
4722 assert_eq!(
4723 boundaries_in_range(Point::new(1, 0)..Point::new(4, 0), &snapshot),
4724 &[(2, "ddd\neeee".to_string(), false)]
4725 );
4726 assert_eq!(
4727 boundaries_in_range(Point::new(2, 0)..Point::new(3, 0), &snapshot),
4728 &[(2, "ddd\neeee".to_string(), false)]
4729 );
4730 assert_eq!(
4731 boundaries_in_range(Point::new(4, 0)..Point::new(4, 2), &snapshot),
4732 &[(4, "jj".to_string(), true)]
4733 );
4734 assert_eq!(
4735 boundaries_in_range(Point::new(4, 2)..Point::new(4, 2), &snapshot),
4736 &[]
4737 );
4738
4739 buffer_1.update(cx, |buffer, cx| {
4740 let text = "\n";
4741 buffer.edit(
4742 [
4743 (Point::new(0, 0)..Point::new(0, 0), text),
4744 (Point::new(2, 1)..Point::new(2, 3), text),
4745 ],
4746 None,
4747 cx,
4748 );
4749 });
4750
4751 let snapshot = multibuffer.read(cx).snapshot(cx);
4752 assert_eq!(
4753 snapshot.text(),
4754 concat!(
4755 "bbbb\n", // Preserve newlines
4756 "c\n", //
4757 "cc\n", //
4758 "ddd\n", //
4759 "eeee\n", //
4760 "jj" //
4761 )
4762 );
4763
4764 assert_eq!(
4765 subscription.consume().into_inner(),
4766 [Edit {
4767 old: 6..8,
4768 new: 6..7
4769 }]
4770 );
4771
4772 let snapshot = multibuffer.read(cx).snapshot(cx);
4773 assert_eq!(
4774 snapshot.clip_point(Point::new(0, 5), Bias::Left),
4775 Point::new(0, 4)
4776 );
4777 assert_eq!(
4778 snapshot.clip_point(Point::new(0, 5), Bias::Right),
4779 Point::new(0, 4)
4780 );
4781 assert_eq!(
4782 snapshot.clip_point(Point::new(5, 1), Bias::Right),
4783 Point::new(5, 1)
4784 );
4785 assert_eq!(
4786 snapshot.clip_point(Point::new(5, 2), Bias::Right),
4787 Point::new(5, 2)
4788 );
4789 assert_eq!(
4790 snapshot.clip_point(Point::new(5, 3), Bias::Right),
4791 Point::new(5, 2)
4792 );
4793
4794 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
4795 let (buffer_2_excerpt_id, _) =
4796 multibuffer.excerpts_for_buffer(&buffer_2, cx)[0].clone();
4797 multibuffer.remove_excerpts([buffer_2_excerpt_id], cx);
4798 multibuffer.snapshot(cx)
4799 });
4800
4801 assert_eq!(
4802 snapshot.text(),
4803 concat!(
4804 "bbbb\n", // Preserve newlines
4805 "c\n", //
4806 "cc\n", //
4807 "ddd\n", //
4808 "eeee", //
4809 )
4810 );
4811
4812 fn boundaries_in_range(
4813 range: Range<Point>,
4814 snapshot: &MultiBufferSnapshot,
4815 ) -> Vec<(u32, String, bool)> {
4816 snapshot
4817 .excerpt_boundaries_in_range(range)
4818 .map(|boundary| {
4819 (
4820 boundary.row,
4821 boundary
4822 .buffer
4823 .text_for_range(boundary.range.context)
4824 .collect::<String>(),
4825 boundary.starts_new_buffer,
4826 )
4827 })
4828 .collect::<Vec<_>>()
4829 }
4830 }
4831
4832 #[gpui::test]
4833 fn test_excerpt_events(cx: &mut AppContext) {
4834 let buffer_1 = cx.new_model(|cx| Buffer::local(sample_text(10, 3, 'a'), cx));
4835 let buffer_2 = cx.new_model(|cx| Buffer::local(sample_text(10, 3, 'm'), cx));
4836
4837 let leader_multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
4838 let follower_multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
4839 let follower_edit_event_count = Arc::new(RwLock::new(0));
4840
4841 follower_multibuffer.update(cx, |_, cx| {
4842 let follower_edit_event_count = follower_edit_event_count.clone();
4843 cx.subscribe(
4844 &leader_multibuffer,
4845 move |follower, _, event, cx| match event.clone() {
4846 Event::ExcerptsAdded {
4847 buffer,
4848 predecessor,
4849 excerpts,
4850 } => follower.insert_excerpts_with_ids_after(predecessor, buffer, excerpts, cx),
4851 Event::ExcerptsRemoved { ids } => follower.remove_excerpts(ids, cx),
4852 Event::Edited { .. } => {
4853 *follower_edit_event_count.write() += 1;
4854 }
4855 _ => {}
4856 },
4857 )
4858 .detach();
4859 });
4860
4861 leader_multibuffer.update(cx, |leader, cx| {
4862 leader.push_excerpts(
4863 buffer_1.clone(),
4864 [
4865 ExcerptRange {
4866 context: 0..8,
4867 primary: None,
4868 },
4869 ExcerptRange {
4870 context: 12..16,
4871 primary: None,
4872 },
4873 ],
4874 cx,
4875 );
4876 leader.insert_excerpts_after(
4877 leader.excerpt_ids()[0],
4878 buffer_2.clone(),
4879 [
4880 ExcerptRange {
4881 context: 0..5,
4882 primary: None,
4883 },
4884 ExcerptRange {
4885 context: 10..15,
4886 primary: None,
4887 },
4888 ],
4889 cx,
4890 )
4891 });
4892 assert_eq!(
4893 leader_multibuffer.read(cx).snapshot(cx).text(),
4894 follower_multibuffer.read(cx).snapshot(cx).text(),
4895 );
4896 assert_eq!(*follower_edit_event_count.read(), 2);
4897
4898 leader_multibuffer.update(cx, |leader, cx| {
4899 let excerpt_ids = leader.excerpt_ids();
4900 leader.remove_excerpts([excerpt_ids[1], excerpt_ids[3]], cx);
4901 });
4902 assert_eq!(
4903 leader_multibuffer.read(cx).snapshot(cx).text(),
4904 follower_multibuffer.read(cx).snapshot(cx).text(),
4905 );
4906 assert_eq!(*follower_edit_event_count.read(), 3);
4907
4908 // Removing an empty set of excerpts is a noop.
4909 leader_multibuffer.update(cx, |leader, cx| {
4910 leader.remove_excerpts([], cx);
4911 });
4912 assert_eq!(
4913 leader_multibuffer.read(cx).snapshot(cx).text(),
4914 follower_multibuffer.read(cx).snapshot(cx).text(),
4915 );
4916 assert_eq!(*follower_edit_event_count.read(), 3);
4917
4918 // Adding an empty set of excerpts is a noop.
4919 leader_multibuffer.update(cx, |leader, cx| {
4920 leader.push_excerpts::<usize>(buffer_2.clone(), [], cx);
4921 });
4922 assert_eq!(
4923 leader_multibuffer.read(cx).snapshot(cx).text(),
4924 follower_multibuffer.read(cx).snapshot(cx).text(),
4925 );
4926 assert_eq!(*follower_edit_event_count.read(), 3);
4927
4928 leader_multibuffer.update(cx, |leader, cx| {
4929 leader.clear(cx);
4930 });
4931 assert_eq!(
4932 leader_multibuffer.read(cx).snapshot(cx).text(),
4933 follower_multibuffer.read(cx).snapshot(cx).text(),
4934 );
4935 assert_eq!(*follower_edit_event_count.read(), 4);
4936 }
4937
4938 #[gpui::test]
4939 fn test_expand_excerpts(cx: &mut AppContext) {
4940 let buffer = cx.new_model(|cx| Buffer::local(sample_text(20, 3, 'a'), cx));
4941 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
4942
4943 multibuffer.update(cx, |multibuffer, cx| {
4944 multibuffer.push_excerpts_with_context_lines(
4945 buffer.clone(),
4946 vec![
4947 // Note that in this test, this first excerpt
4948 // does not contain a new line
4949 Point::new(3, 2)..Point::new(3, 3),
4950 Point::new(7, 1)..Point::new(7, 3),
4951 Point::new(15, 0)..Point::new(15, 0),
4952 ],
4953 1,
4954 cx,
4955 )
4956 });
4957
4958 multibuffer.update(cx, |multibuffer, cx| {
4959 multibuffer.expand_excerpts(multibuffer.excerpt_ids(), 1, cx)
4960 });
4961
4962 let snapshot = multibuffer.read(cx).snapshot(cx);
4963
4964 // Expanding context lines causes the line containing 'fff' to appear in two different excerpts.
4965 // We don't attempt to merge them, because removing the excerpt could create inconsistency with other layers
4966 // that are tracking excerpt ids.
4967 assert_eq!(
4968 snapshot.text(),
4969 concat!(
4970 "bbb\n", // Preserve newlines
4971 "ccc\n", //
4972 "ddd\n", //
4973 "eee\n", //
4974 "fff\n", // <- Same as below
4975 "\n", // Excerpt boundary
4976 "fff\n", // <- Same as above
4977 "ggg\n", //
4978 "hhh\n", //
4979 "iii\n", //
4980 "jjj\n", //
4981 "\n", //
4982 "nnn\n", //
4983 "ooo\n", //
4984 "ppp\n", //
4985 "qqq\n", //
4986 "rrr\n", //
4987 )
4988 );
4989 }
4990
4991 #[gpui::test]
4992 fn test_push_excerpts_with_context_lines(cx: &mut AppContext) {
4993 let buffer = cx.new_model(|cx| Buffer::local(sample_text(20, 3, 'a'), cx));
4994 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
4995 let anchor_ranges = multibuffer.update(cx, |multibuffer, cx| {
4996 multibuffer.push_excerpts_with_context_lines(
4997 buffer.clone(),
4998 vec![
4999 // Note that in this test, this first excerpt
5000 // does contain a new line
5001 Point::new(3, 2)..Point::new(4, 2),
5002 Point::new(7, 1)..Point::new(7, 3),
5003 Point::new(15, 0)..Point::new(15, 0),
5004 ],
5005 2,
5006 cx,
5007 )
5008 });
5009
5010 let snapshot = multibuffer.read(cx).snapshot(cx);
5011 assert_eq!(
5012 snapshot.text(),
5013 concat!(
5014 "bbb\n", // Preserve newlines
5015 "ccc\n", //
5016 "ddd\n", //
5017 "eee\n", //
5018 "fff\n", //
5019 "ggg\n", //
5020 "hhh\n", //
5021 "iii\n", //
5022 "jjj\n", //
5023 "\n", //
5024 "nnn\n", //
5025 "ooo\n", //
5026 "ppp\n", //
5027 "qqq\n", //
5028 "rrr\n", //
5029 )
5030 );
5031
5032 assert_eq!(
5033 anchor_ranges
5034 .iter()
5035 .map(|range| range.to_point(&snapshot))
5036 .collect::<Vec<_>>(),
5037 vec![
5038 Point::new(2, 2)..Point::new(3, 2),
5039 Point::new(6, 1)..Point::new(6, 3),
5040 Point::new(12, 0)..Point::new(12, 0)
5041 ]
5042 );
5043 }
5044
5045 #[gpui::test]
5046 async fn test_stream_excerpts_with_context_lines(cx: &mut TestAppContext) {
5047 let buffer = cx.new_model(|cx| Buffer::local(sample_text(20, 3, 'a'), cx));
5048 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
5049 let anchor_ranges = multibuffer.update(cx, |multibuffer, cx| {
5050 let snapshot = buffer.read(cx);
5051 let ranges = vec![
5052 snapshot.anchor_before(Point::new(3, 2))..snapshot.anchor_before(Point::new(4, 2)),
5053 snapshot.anchor_before(Point::new(7, 1))..snapshot.anchor_before(Point::new(7, 3)),
5054 snapshot.anchor_before(Point::new(15, 0))
5055 ..snapshot.anchor_before(Point::new(15, 0)),
5056 ];
5057 multibuffer.stream_excerpts_with_context_lines(buffer.clone(), ranges, 2, cx)
5058 });
5059
5060 let anchor_ranges = anchor_ranges.collect::<Vec<_>>().await;
5061
5062 let snapshot = multibuffer.update(cx, |multibuffer, cx| multibuffer.snapshot(cx));
5063 assert_eq!(
5064 snapshot.text(),
5065 concat!(
5066 "bbb\n", //
5067 "ccc\n", //
5068 "ddd\n", //
5069 "eee\n", //
5070 "fff\n", //
5071 "ggg\n", //
5072 "hhh\n", //
5073 "iii\n", //
5074 "jjj\n", //
5075 "\n", //
5076 "nnn\n", //
5077 "ooo\n", //
5078 "ppp\n", //
5079 "qqq\n", //
5080 "rrr\n", //
5081 )
5082 );
5083
5084 assert_eq!(
5085 anchor_ranges
5086 .iter()
5087 .map(|range| range.to_point(&snapshot))
5088 .collect::<Vec<_>>(),
5089 vec![
5090 Point::new(2, 2)..Point::new(3, 2),
5091 Point::new(6, 1)..Point::new(6, 3),
5092 Point::new(12, 0)..Point::new(12, 0)
5093 ]
5094 );
5095 }
5096
5097 #[gpui::test]
5098 fn test_empty_multibuffer(cx: &mut AppContext) {
5099 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
5100
5101 let snapshot = multibuffer.read(cx).snapshot(cx);
5102 assert_eq!(snapshot.text(), "");
5103 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
5104 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
5105 }
5106
5107 #[gpui::test]
5108 fn test_singleton_multibuffer_anchors(cx: &mut AppContext) {
5109 let buffer = cx.new_model(|cx| Buffer::local("abcd", cx));
5110 let multibuffer = cx.new_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
5111 let old_snapshot = multibuffer.read(cx).snapshot(cx);
5112 buffer.update(cx, |buffer, cx| {
5113 buffer.edit([(0..0, "X")], None, cx);
5114 buffer.edit([(5..5, "Y")], None, cx);
5115 });
5116 let new_snapshot = multibuffer.read(cx).snapshot(cx);
5117
5118 assert_eq!(old_snapshot.text(), "abcd");
5119 assert_eq!(new_snapshot.text(), "XabcdY");
5120
5121 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
5122 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
5123 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
5124 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
5125 }
5126
5127 #[gpui::test]
5128 fn test_multibuffer_anchors(cx: &mut AppContext) {
5129 let buffer_1 = cx.new_model(|cx| Buffer::local("abcd", cx));
5130 let buffer_2 = cx.new_model(|cx| Buffer::local("efghi", cx));
5131 let multibuffer = cx.new_model(|cx| {
5132 let mut multibuffer = MultiBuffer::new(0, Capability::ReadWrite);
5133 multibuffer.push_excerpts(
5134 buffer_1.clone(),
5135 [ExcerptRange {
5136 context: 0..4,
5137 primary: None,
5138 }],
5139 cx,
5140 );
5141 multibuffer.push_excerpts(
5142 buffer_2.clone(),
5143 [ExcerptRange {
5144 context: 0..5,
5145 primary: None,
5146 }],
5147 cx,
5148 );
5149 multibuffer
5150 });
5151 let old_snapshot = multibuffer.read(cx).snapshot(cx);
5152
5153 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
5154 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
5155 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
5156 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
5157 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
5158 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
5159
5160 buffer_1.update(cx, |buffer, cx| {
5161 buffer.edit([(0..0, "W")], None, cx);
5162 buffer.edit([(5..5, "X")], None, cx);
5163 });
5164 buffer_2.update(cx, |buffer, cx| {
5165 buffer.edit([(0..0, "Y")], None, cx);
5166 buffer.edit([(6..6, "Z")], None, cx);
5167 });
5168 let new_snapshot = multibuffer.read(cx).snapshot(cx);
5169
5170 assert_eq!(old_snapshot.text(), "abcd\nefghi");
5171 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
5172
5173 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
5174 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
5175 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
5176 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
5177 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
5178 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
5179 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
5180 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
5181 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
5182 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
5183 }
5184
5185 #[gpui::test]
5186 fn test_resolving_anchors_after_replacing_their_excerpts(cx: &mut AppContext) {
5187 let buffer_1 = cx.new_model(|cx| Buffer::local("abcd", cx));
5188 let buffer_2 = cx.new_model(|cx| Buffer::local("ABCDEFGHIJKLMNOP", cx));
5189 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
5190
5191 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
5192 // Add an excerpt from buffer 1 that spans this new insertion.
5193 buffer_1.update(cx, |buffer, cx| buffer.edit([(4..4, "123")], None, cx));
5194 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
5195 multibuffer
5196 .push_excerpts(
5197 buffer_1.clone(),
5198 [ExcerptRange {
5199 context: 0..7,
5200 primary: None,
5201 }],
5202 cx,
5203 )
5204 .pop()
5205 .unwrap()
5206 });
5207
5208 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
5209 assert_eq!(snapshot_1.text(), "abcd123");
5210
5211 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
5212 let (excerpt_id_2, excerpt_id_3) = multibuffer.update(cx, |multibuffer, cx| {
5213 multibuffer.remove_excerpts([excerpt_id_1], cx);
5214 let mut ids = multibuffer
5215 .push_excerpts(
5216 buffer_2.clone(),
5217 [
5218 ExcerptRange {
5219 context: 0..4,
5220 primary: None,
5221 },
5222 ExcerptRange {
5223 context: 6..10,
5224 primary: None,
5225 },
5226 ExcerptRange {
5227 context: 12..16,
5228 primary: None,
5229 },
5230 ],
5231 cx,
5232 )
5233 .into_iter();
5234 (ids.next().unwrap(), ids.next().unwrap())
5235 });
5236 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
5237 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
5238
5239 // The old excerpt id doesn't get reused.
5240 assert_ne!(excerpt_id_2, excerpt_id_1);
5241
5242 // Resolve some anchors from the previous snapshot in the new snapshot.
5243 // The current excerpts are from a different buffer, so we don't attempt to
5244 // resolve the old text anchor in the new buffer.
5245 assert_eq!(
5246 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
5247 0
5248 );
5249 assert_eq!(
5250 snapshot_2.summaries_for_anchors::<usize, _>(&[
5251 snapshot_1.anchor_before(2),
5252 snapshot_1.anchor_after(3)
5253 ]),
5254 vec![0, 0]
5255 );
5256
5257 // Refresh anchors from the old snapshot. The return value indicates that both
5258 // anchors lost their original excerpt.
5259 let refresh =
5260 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
5261 assert_eq!(
5262 refresh,
5263 &[
5264 (0, snapshot_2.anchor_before(0), false),
5265 (1, snapshot_2.anchor_after(0), false),
5266 ]
5267 );
5268
5269 // Replace the middle excerpt with a smaller excerpt in buffer 2,
5270 // that intersects the old excerpt.
5271 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
5272 multibuffer.remove_excerpts([excerpt_id_3], cx);
5273 multibuffer
5274 .insert_excerpts_after(
5275 excerpt_id_2,
5276 buffer_2.clone(),
5277 [ExcerptRange {
5278 context: 5..8,
5279 primary: None,
5280 }],
5281 cx,
5282 )
5283 .pop()
5284 .unwrap()
5285 });
5286
5287 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
5288 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
5289 assert_ne!(excerpt_id_5, excerpt_id_3);
5290
5291 // Resolve some anchors from the previous snapshot in the new snapshot.
5292 // The third anchor can't be resolved, since its excerpt has been removed,
5293 // so it resolves to the same position as its predecessor.
5294 let anchors = [
5295 snapshot_2.anchor_before(0),
5296 snapshot_2.anchor_after(2),
5297 snapshot_2.anchor_after(6),
5298 snapshot_2.anchor_after(14),
5299 ];
5300 assert_eq!(
5301 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
5302 &[0, 2, 9, 13]
5303 );
5304
5305 let new_anchors = snapshot_3.refresh_anchors(&anchors);
5306 assert_eq!(
5307 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
5308 &[(0, true), (1, true), (2, true), (3, true)]
5309 );
5310 assert_eq!(
5311 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
5312 &[0, 2, 7, 13]
5313 );
5314 }
5315
5316 #[gpui::test(iterations = 100)]
5317 fn test_random_multibuffer(cx: &mut AppContext, mut rng: StdRng) {
5318 let operations = env::var("OPERATIONS")
5319 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
5320 .unwrap_or(10);
5321
5322 let mut buffers: Vec<Model<Buffer>> = Vec::new();
5323 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
5324 let mut excerpt_ids = Vec::<ExcerptId>::new();
5325 let mut expected_excerpts = Vec::<(Model<Buffer>, Range<text::Anchor>)>::new();
5326 let mut anchors = Vec::new();
5327 let mut old_versions = Vec::new();
5328
5329 for _ in 0..operations {
5330 match rng.gen_range(0..100) {
5331 0..=14 if !buffers.is_empty() => {
5332 let buffer = buffers.choose(&mut rng).unwrap();
5333 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
5334 }
5335 15..=19 if !expected_excerpts.is_empty() => {
5336 multibuffer.update(cx, |multibuffer, cx| {
5337 let ids = multibuffer.excerpt_ids();
5338 let mut excerpts = HashSet::default();
5339 for _ in 0..rng.gen_range(0..ids.len()) {
5340 excerpts.extend(ids.choose(&mut rng).copied());
5341 }
5342
5343 let line_count = rng.gen_range(0..5);
5344
5345 let excerpt_ixs = excerpts
5346 .iter()
5347 .map(|id| excerpt_ids.iter().position(|i| i == id).unwrap())
5348 .collect::<Vec<_>>();
5349 log::info!("Expanding excerpts {excerpt_ixs:?} by {line_count} lines");
5350 multibuffer.expand_excerpts(excerpts.iter().cloned(), line_count, cx);
5351
5352 if line_count > 0 {
5353 for id in excerpts {
5354 let excerpt_ix = excerpt_ids.iter().position(|&i| i == id).unwrap();
5355 let (buffer, range) = &mut expected_excerpts[excerpt_ix];
5356 let snapshot = buffer.read(cx).snapshot();
5357 let mut point_range = range.to_point(&snapshot);
5358 point_range.start =
5359 Point::new(point_range.start.row.saturating_sub(line_count), 0);
5360 point_range.end = snapshot.clip_point(
5361 Point::new(point_range.end.row + line_count, 0),
5362 Bias::Left,
5363 );
5364 *range = snapshot.anchor_before(point_range.start)
5365 ..snapshot.anchor_after(point_range.end);
5366 }
5367 }
5368 });
5369 }
5370 20..=29 if !expected_excerpts.is_empty() => {
5371 let mut ids_to_remove = vec![];
5372 for _ in 0..rng.gen_range(1..=3) {
5373 if expected_excerpts.is_empty() {
5374 break;
5375 }
5376
5377 let ix = rng.gen_range(0..expected_excerpts.len());
5378 ids_to_remove.push(excerpt_ids.remove(ix));
5379 let (buffer, range) = expected_excerpts.remove(ix);
5380 let buffer = buffer.read(cx);
5381 log::info!(
5382 "Removing excerpt {}: {:?}",
5383 ix,
5384 buffer
5385 .text_for_range(range.to_offset(buffer))
5386 .collect::<String>(),
5387 );
5388 }
5389 let snapshot = multibuffer.read(cx).read(cx);
5390 ids_to_remove.sort_unstable_by(|a, b| a.cmp(&b, &snapshot));
5391 drop(snapshot);
5392 multibuffer.update(cx, |multibuffer, cx| {
5393 multibuffer.remove_excerpts(ids_to_remove, cx)
5394 });
5395 }
5396 30..=39 if !expected_excerpts.is_empty() => {
5397 let multibuffer = multibuffer.read(cx).read(cx);
5398 let offset =
5399 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
5400 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
5401 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
5402 anchors.push(multibuffer.anchor_at(offset, bias));
5403 anchors.sort_by(|a, b| a.cmp(b, &multibuffer));
5404 }
5405 40..=44 if !anchors.is_empty() => {
5406 let multibuffer = multibuffer.read(cx).read(cx);
5407 let prev_len = anchors.len();
5408 anchors = multibuffer
5409 .refresh_anchors(&anchors)
5410 .into_iter()
5411 .map(|a| a.1)
5412 .collect();
5413
5414 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
5415 // overshoot its boundaries.
5416 assert_eq!(anchors.len(), prev_len);
5417 for anchor in &anchors {
5418 if anchor.excerpt_id == ExcerptId::min()
5419 || anchor.excerpt_id == ExcerptId::max()
5420 {
5421 continue;
5422 }
5423
5424 let excerpt = multibuffer.excerpt(anchor.excerpt_id).unwrap();
5425 assert_eq!(excerpt.id, anchor.excerpt_id);
5426 assert!(excerpt.contains(anchor));
5427 }
5428 }
5429 _ => {
5430 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
5431 let base_text = util::RandomCharIter::new(&mut rng)
5432 .take(25)
5433 .collect::<String>();
5434
5435 buffers.push(cx.new_model(|cx| Buffer::local(base_text, cx)));
5436 buffers.last().unwrap()
5437 } else {
5438 buffers.choose(&mut rng).unwrap()
5439 };
5440
5441 let buffer = buffer_handle.read(cx);
5442 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
5443 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
5444 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
5445 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
5446 let prev_excerpt_id = excerpt_ids
5447 .get(prev_excerpt_ix)
5448 .cloned()
5449 .unwrap_or_else(ExcerptId::max);
5450 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
5451
5452 log::info!(
5453 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
5454 excerpt_ix,
5455 expected_excerpts.len(),
5456 buffer_handle.read(cx).remote_id(),
5457 buffer.text(),
5458 start_ix..end_ix,
5459 &buffer.text()[start_ix..end_ix]
5460 );
5461
5462 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
5463 multibuffer
5464 .insert_excerpts_after(
5465 prev_excerpt_id,
5466 buffer_handle.clone(),
5467 [ExcerptRange {
5468 context: start_ix..end_ix,
5469 primary: None,
5470 }],
5471 cx,
5472 )
5473 .pop()
5474 .unwrap()
5475 });
5476
5477 excerpt_ids.insert(excerpt_ix, excerpt_id);
5478 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
5479 }
5480 }
5481
5482 if rng.gen_bool(0.3) {
5483 multibuffer.update(cx, |multibuffer, cx| {
5484 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
5485 })
5486 }
5487
5488 let snapshot = multibuffer.read(cx).snapshot(cx);
5489
5490 let mut excerpt_starts = Vec::new();
5491 let mut expected_text = String::new();
5492 let mut expected_buffer_rows = Vec::new();
5493 for (buffer, range) in &expected_excerpts {
5494 let buffer = buffer.read(cx);
5495 let buffer_range = range.to_offset(buffer);
5496
5497 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
5498 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
5499 expected_text.push('\n');
5500
5501 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
5502 ..=buffer.offset_to_point(buffer_range.end).row;
5503 for row in buffer_row_range {
5504 expected_buffer_rows.push(Some(row));
5505 }
5506 }
5507 // Remove final trailing newline.
5508 if !expected_excerpts.is_empty() {
5509 expected_text.pop();
5510 }
5511
5512 // Always report one buffer row
5513 if expected_buffer_rows.is_empty() {
5514 expected_buffer_rows.push(Some(0));
5515 }
5516
5517 assert_eq!(snapshot.text(), expected_text);
5518 log::info!("MultiBuffer text: {:?}", expected_text);
5519
5520 assert_eq!(
5521 snapshot.buffer_rows(0).collect::<Vec<_>>(),
5522 expected_buffer_rows,
5523 );
5524
5525 for _ in 0..5 {
5526 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
5527 assert_eq!(
5528 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
5529 &expected_buffer_rows[start_row..],
5530 "buffer_rows({})",
5531 start_row
5532 );
5533 }
5534
5535 assert_eq!(
5536 snapshot.max_buffer_row(),
5537 expected_buffer_rows.into_iter().flatten().max().unwrap()
5538 );
5539
5540 let mut excerpt_starts = excerpt_starts.into_iter();
5541 for (buffer, range) in &expected_excerpts {
5542 let buffer = buffer.read(cx);
5543 let buffer_id = buffer.remote_id();
5544 let buffer_range = range.to_offset(buffer);
5545 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
5546 let buffer_start_point_utf16 =
5547 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
5548
5549 let excerpt_start = excerpt_starts.next().unwrap();
5550 let mut offset = excerpt_start.len;
5551 let mut buffer_offset = buffer_range.start;
5552 let mut point = excerpt_start.lines;
5553 let mut buffer_point = buffer_start_point;
5554 let mut point_utf16 = excerpt_start.lines_utf16();
5555 let mut buffer_point_utf16 = buffer_start_point_utf16;
5556 for ch in buffer
5557 .snapshot()
5558 .chunks(buffer_range.clone(), false)
5559 .flat_map(|c| c.text.chars())
5560 {
5561 for _ in 0..ch.len_utf8() {
5562 let left_offset = snapshot.clip_offset(offset, Bias::Left);
5563 let right_offset = snapshot.clip_offset(offset, Bias::Right);
5564 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
5565 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
5566 assert_eq!(
5567 left_offset,
5568 excerpt_start.len + (buffer_left_offset - buffer_range.start),
5569 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
5570 offset,
5571 buffer_id,
5572 buffer_offset,
5573 );
5574 assert_eq!(
5575 right_offset,
5576 excerpt_start.len + (buffer_right_offset - buffer_range.start),
5577 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
5578 offset,
5579 buffer_id,
5580 buffer_offset,
5581 );
5582
5583 let left_point = snapshot.clip_point(point, Bias::Left);
5584 let right_point = snapshot.clip_point(point, Bias::Right);
5585 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
5586 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
5587 assert_eq!(
5588 left_point,
5589 excerpt_start.lines + (buffer_left_point - buffer_start_point),
5590 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
5591 point,
5592 buffer_id,
5593 buffer_point,
5594 );
5595 assert_eq!(
5596 right_point,
5597 excerpt_start.lines + (buffer_right_point - buffer_start_point),
5598 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
5599 point,
5600 buffer_id,
5601 buffer_point,
5602 );
5603
5604 assert_eq!(
5605 snapshot.point_to_offset(left_point),
5606 left_offset,
5607 "point_to_offset({:?})",
5608 left_point,
5609 );
5610 assert_eq!(
5611 snapshot.offset_to_point(left_offset),
5612 left_point,
5613 "offset_to_point({:?})",
5614 left_offset,
5615 );
5616
5617 offset += 1;
5618 buffer_offset += 1;
5619 if ch == '\n' {
5620 point += Point::new(1, 0);
5621 buffer_point += Point::new(1, 0);
5622 } else {
5623 point += Point::new(0, 1);
5624 buffer_point += Point::new(0, 1);
5625 }
5626 }
5627
5628 for _ in 0..ch.len_utf16() {
5629 let left_point_utf16 =
5630 snapshot.clip_point_utf16(Unclipped(point_utf16), Bias::Left);
5631 let right_point_utf16 =
5632 snapshot.clip_point_utf16(Unclipped(point_utf16), Bias::Right);
5633 let buffer_left_point_utf16 =
5634 buffer.clip_point_utf16(Unclipped(buffer_point_utf16), Bias::Left);
5635 let buffer_right_point_utf16 =
5636 buffer.clip_point_utf16(Unclipped(buffer_point_utf16), Bias::Right);
5637 assert_eq!(
5638 left_point_utf16,
5639 excerpt_start.lines_utf16()
5640 + (buffer_left_point_utf16 - buffer_start_point_utf16),
5641 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
5642 point_utf16,
5643 buffer_id,
5644 buffer_point_utf16,
5645 );
5646 assert_eq!(
5647 right_point_utf16,
5648 excerpt_start.lines_utf16()
5649 + (buffer_right_point_utf16 - buffer_start_point_utf16),
5650 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
5651 point_utf16,
5652 buffer_id,
5653 buffer_point_utf16,
5654 );
5655
5656 if ch == '\n' {
5657 point_utf16 += PointUtf16::new(1, 0);
5658 buffer_point_utf16 += PointUtf16::new(1, 0);
5659 } else {
5660 point_utf16 += PointUtf16::new(0, 1);
5661 buffer_point_utf16 += PointUtf16::new(0, 1);
5662 }
5663 }
5664 }
5665 }
5666
5667 for (row, line) in expected_text.split('\n').enumerate() {
5668 assert_eq!(
5669 snapshot.line_len(row as u32),
5670 line.len() as u32,
5671 "line_len({}).",
5672 row
5673 );
5674 }
5675
5676 let text_rope = Rope::from(expected_text.as_str());
5677 for _ in 0..10 {
5678 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
5679 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
5680
5681 let text_for_range = snapshot
5682 .text_for_range(start_ix..end_ix)
5683 .collect::<String>();
5684 assert_eq!(
5685 text_for_range,
5686 &expected_text[start_ix..end_ix],
5687 "incorrect text for range {:?}",
5688 start_ix..end_ix
5689 );
5690
5691 let excerpted_buffer_ranges = multibuffer
5692 .read(cx)
5693 .range_to_buffer_ranges(start_ix..end_ix, cx);
5694 let excerpted_buffers_text = excerpted_buffer_ranges
5695 .iter()
5696 .map(|(buffer, buffer_range, _)| {
5697 buffer
5698 .read(cx)
5699 .text_for_range(buffer_range.clone())
5700 .collect::<String>()
5701 })
5702 .collect::<Vec<_>>()
5703 .join("\n");
5704 assert_eq!(excerpted_buffers_text, text_for_range);
5705 if !expected_excerpts.is_empty() {
5706 assert!(!excerpted_buffer_ranges.is_empty());
5707 }
5708
5709 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
5710 assert_eq!(
5711 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
5712 expected_summary,
5713 "incorrect summary for range {:?}",
5714 start_ix..end_ix
5715 );
5716 }
5717
5718 // Anchor resolution
5719 let summaries = snapshot.summaries_for_anchors::<usize, _>(&anchors);
5720 assert_eq!(anchors.len(), summaries.len());
5721 for (anchor, resolved_offset) in anchors.iter().zip(summaries) {
5722 assert!(resolved_offset <= snapshot.len());
5723 assert_eq!(
5724 snapshot.summary_for_anchor::<usize>(anchor),
5725 resolved_offset
5726 );
5727 }
5728
5729 for _ in 0..10 {
5730 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
5731 assert_eq!(
5732 snapshot.reversed_chars_at(end_ix).collect::<String>(),
5733 expected_text[..end_ix].chars().rev().collect::<String>(),
5734 );
5735 }
5736
5737 for _ in 0..10 {
5738 let end_ix = rng.gen_range(0..=text_rope.len());
5739 let start_ix = rng.gen_range(0..=end_ix);
5740 assert_eq!(
5741 snapshot
5742 .bytes_in_range(start_ix..end_ix)
5743 .flatten()
5744 .copied()
5745 .collect::<Vec<_>>(),
5746 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
5747 "bytes_in_range({:?})",
5748 start_ix..end_ix,
5749 );
5750 }
5751 }
5752
5753 let snapshot = multibuffer.read(cx).snapshot(cx);
5754 for (old_snapshot, subscription) in old_versions {
5755 let edits = subscription.consume().into_inner();
5756
5757 log::info!(
5758 "applying subscription edits to old text: {:?}: {:?}",
5759 old_snapshot.text(),
5760 edits,
5761 );
5762
5763 let mut text = old_snapshot.text();
5764 for edit in edits {
5765 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
5766 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
5767 }
5768 assert_eq!(text.to_string(), snapshot.text());
5769 }
5770 }
5771
5772 #[gpui::test]
5773 fn test_history(cx: &mut AppContext) {
5774 let test_settings = SettingsStore::test(cx);
5775 cx.set_global(test_settings);
5776
5777 let buffer_1 = cx.new_model(|cx| Buffer::local("1234", cx));
5778 let buffer_2 = cx.new_model(|cx| Buffer::local("5678", cx));
5779 let multibuffer = cx.new_model(|_| MultiBuffer::new(0, Capability::ReadWrite));
5780 let group_interval = multibuffer.read(cx).history.group_interval;
5781 multibuffer.update(cx, |multibuffer, cx| {
5782 multibuffer.push_excerpts(
5783 buffer_1.clone(),
5784 [ExcerptRange {
5785 context: 0..buffer_1.read(cx).len(),
5786 primary: None,
5787 }],
5788 cx,
5789 );
5790 multibuffer.push_excerpts(
5791 buffer_2.clone(),
5792 [ExcerptRange {
5793 context: 0..buffer_2.read(cx).len(),
5794 primary: None,
5795 }],
5796 cx,
5797 );
5798 });
5799
5800 let mut now = Instant::now();
5801
5802 multibuffer.update(cx, |multibuffer, cx| {
5803 let transaction_1 = multibuffer.start_transaction_at(now, cx).unwrap();
5804 multibuffer.edit(
5805 [
5806 (Point::new(0, 0)..Point::new(0, 0), "A"),
5807 (Point::new(1, 0)..Point::new(1, 0), "A"),
5808 ],
5809 None,
5810 cx,
5811 );
5812 multibuffer.edit(
5813 [
5814 (Point::new(0, 1)..Point::new(0, 1), "B"),
5815 (Point::new(1, 1)..Point::new(1, 1), "B"),
5816 ],
5817 None,
5818 cx,
5819 );
5820 multibuffer.end_transaction_at(now, cx);
5821 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5822
5823 // Edit buffer 1 through the multibuffer
5824 now += 2 * group_interval;
5825 multibuffer.start_transaction_at(now, cx);
5826 multibuffer.edit([(2..2, "C")], None, cx);
5827 multibuffer.end_transaction_at(now, cx);
5828 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
5829
5830 // Edit buffer 1 independently
5831 buffer_1.update(cx, |buffer_1, cx| {
5832 buffer_1.start_transaction_at(now);
5833 buffer_1.edit([(3..3, "D")], None, cx);
5834 buffer_1.end_transaction_at(now, cx);
5835
5836 now += 2 * group_interval;
5837 buffer_1.start_transaction_at(now);
5838 buffer_1.edit([(4..4, "E")], None, cx);
5839 buffer_1.end_transaction_at(now, cx);
5840 });
5841 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\nAB5678");
5842
5843 // An undo in the multibuffer undoes the multibuffer transaction
5844 // and also any individual buffer edits that have occurred since
5845 // that transaction.
5846 multibuffer.undo(cx);
5847 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5848
5849 multibuffer.undo(cx);
5850 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5851
5852 multibuffer.redo(cx);
5853 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5854
5855 multibuffer.redo(cx);
5856 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\nAB5678");
5857
5858 // Undo buffer 2 independently.
5859 buffer_2.update(cx, |buffer_2, cx| buffer_2.undo(cx));
5860 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\n5678");
5861
5862 // An undo in the multibuffer undoes the components of the
5863 // the last multibuffer transaction that are not already undone.
5864 multibuffer.undo(cx);
5865 assert_eq!(multibuffer.read(cx).text(), "AB1234\n5678");
5866
5867 multibuffer.undo(cx);
5868 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5869
5870 multibuffer.redo(cx);
5871 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5872
5873 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
5874 assert_eq!(multibuffer.read(cx).text(), "ABCD1234\nAB5678");
5875
5876 // Redo stack gets cleared after an edit.
5877 now += 2 * group_interval;
5878 multibuffer.start_transaction_at(now, cx);
5879 multibuffer.edit([(0..0, "X")], None, cx);
5880 multibuffer.end_transaction_at(now, cx);
5881 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5882 multibuffer.redo(cx);
5883 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5884 multibuffer.undo(cx);
5885 assert_eq!(multibuffer.read(cx).text(), "ABCD1234\nAB5678");
5886 multibuffer.undo(cx);
5887 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5888
5889 // Transactions can be grouped manually.
5890 multibuffer.redo(cx);
5891 multibuffer.redo(cx);
5892 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5893 multibuffer.group_until_transaction(transaction_1, cx);
5894 multibuffer.undo(cx);
5895 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5896 multibuffer.redo(cx);
5897 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5898 });
5899 }
5900}