1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt};
4use anyhow::Result;
5use clock::ReplicaId;
6use collections::{HashMap, HashSet};
7use gpui::{AppContext, Entity, ModelContext, ModelHandle, Task};
8pub use language::Completion;
9use language::{
10 Buffer, BufferChunks, BufferSnapshot, Chunk, DiagnosticEntry, Event, File, Language, Outline,
11 OutlineItem, Selection, ToOffset as _, ToPoint as _, TransactionId,
12};
13use std::{
14 cell::{Ref, RefCell},
15 cmp, fmt, io,
16 iter::{self, FromIterator},
17 ops::{Range, Sub},
18 str,
19 sync::Arc,
20 time::{Duration, Instant},
21};
22use sum_tree::{Bias, Cursor, SumTree};
23use text::{
24 locator::Locator,
25 rope::TextDimension,
26 subscription::{Subscription, Topic},
27 AnchorRangeExt as _, Edit, Point, PointUtf16, TextSummary,
28};
29use theme::SyntaxTheme;
30use util::post_inc;
31
32const NEWLINES: &'static [u8] = &[b'\n'; u8::MAX as usize];
33
34pub type ExcerptId = Locator;
35
36pub struct MultiBuffer {
37 snapshot: RefCell<MultiBufferSnapshot>,
38 buffers: RefCell<HashMap<usize, BufferState>>,
39 subscriptions: Topic,
40 singleton: bool,
41 replica_id: ReplicaId,
42 history: History,
43}
44
45struct History {
46 next_transaction_id: usize,
47 undo_stack: Vec<Transaction>,
48 redo_stack: Vec<Transaction>,
49 transaction_depth: usize,
50 group_interval: Duration,
51}
52
53struct Transaction {
54 id: usize,
55 buffer_transactions: HashSet<(usize, text::TransactionId)>,
56 first_edit_at: Instant,
57 last_edit_at: Instant,
58}
59
60pub trait ToOffset: 'static + fmt::Debug {
61 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
62}
63
64pub trait ToPoint: 'static + fmt::Debug {
65 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
66}
67
68struct BufferState {
69 buffer: ModelHandle<Buffer>,
70 last_version: clock::Global,
71 last_parse_count: usize,
72 last_selections_update_count: usize,
73 last_diagnostics_update_count: usize,
74 excerpts: Vec<ExcerptId>,
75 _subscriptions: [gpui::Subscription; 2],
76}
77
78#[derive(Clone, Default)]
79pub struct MultiBufferSnapshot {
80 singleton: bool,
81 excerpts: SumTree<Excerpt>,
82 parse_count: usize,
83 diagnostics_update_count: usize,
84 is_dirty: bool,
85 has_conflict: bool,
86}
87
88pub struct ExcerptProperties<'a, T> {
89 pub buffer: &'a ModelHandle<Buffer>,
90 pub range: Range<T>,
91}
92
93#[derive(Clone)]
94struct Excerpt {
95 id: ExcerptId,
96 buffer_id: usize,
97 buffer: BufferSnapshot,
98 range: Range<text::Anchor>,
99 max_buffer_row: u32,
100 text_summary: TextSummary,
101 has_trailing_newline: bool,
102}
103
104#[derive(Clone, Debug, Default)]
105struct ExcerptSummary {
106 excerpt_id: ExcerptId,
107 max_buffer_row: u32,
108 text: TextSummary,
109}
110
111pub struct MultiBufferRows<'a> {
112 buffer_row_range: Range<u32>,
113 excerpts: Cursor<'a, Excerpt, Point>,
114}
115
116pub struct MultiBufferChunks<'a> {
117 range: Range<usize>,
118 excerpts: Cursor<'a, Excerpt, usize>,
119 excerpt_chunks: Option<ExcerptChunks<'a>>,
120 theme: Option<&'a SyntaxTheme>,
121}
122
123pub struct MultiBufferBytes<'a> {
124 range: Range<usize>,
125 excerpts: Cursor<'a, Excerpt, usize>,
126 excerpt_bytes: Option<ExcerptBytes<'a>>,
127 chunk: &'a [u8],
128}
129
130struct ExcerptChunks<'a> {
131 content_chunks: BufferChunks<'a>,
132 footer_height: usize,
133}
134
135struct ExcerptBytes<'a> {
136 content_bytes: language::rope::Bytes<'a>,
137 footer_height: usize,
138}
139
140impl MultiBuffer {
141 pub fn new(replica_id: ReplicaId) -> Self {
142 Self {
143 snapshot: Default::default(),
144 buffers: Default::default(),
145 subscriptions: Default::default(),
146 singleton: false,
147 replica_id,
148 history: History {
149 next_transaction_id: Default::default(),
150 undo_stack: Default::default(),
151 redo_stack: Default::default(),
152 transaction_depth: 0,
153 group_interval: Duration::from_millis(300),
154 },
155 }
156 }
157
158 pub fn singleton(buffer: ModelHandle<Buffer>, cx: &mut ModelContext<Self>) -> Self {
159 let mut this = Self::new(buffer.read(cx).replica_id());
160 this.singleton = true;
161 this.push_excerpt(
162 ExcerptProperties {
163 buffer: &buffer,
164 range: text::Anchor::min()..text::Anchor::max(),
165 },
166 cx,
167 );
168 this.snapshot.borrow_mut().singleton = true;
169 this
170 }
171
172 #[cfg(any(test, feature = "test-support"))]
173 pub fn build_simple(text: &str, cx: &mut gpui::MutableAppContext) -> ModelHandle<Self> {
174 let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
175 cx.add_model(|cx| Self::singleton(buffer, cx))
176 }
177
178 #[cfg(any(test, feature = "test-support"))]
179 pub fn build_random(
180 mut rng: &mut impl rand::Rng,
181 cx: &mut gpui::MutableAppContext,
182 ) -> ModelHandle<Self> {
183 use rand::prelude::*;
184 use std::env;
185 use text::RandomCharIter;
186
187 let max_excerpts = env::var("MAX_EXCERPTS")
188 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
189 .unwrap_or(5);
190 let excerpts = rng.gen_range(1..=max_excerpts);
191
192 cx.add_model(|cx| {
193 let mut multibuffer = MultiBuffer::new(0);
194 let mut buffers = Vec::new();
195 for _ in 0..excerpts {
196 let buffer_handle = if rng.gen() || buffers.is_empty() {
197 let text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
198 buffers.push(cx.add_model(|cx| Buffer::new(0, text, cx)));
199 let buffer = buffers.last().unwrap();
200 log::info!(
201 "Creating new buffer {} with text: {:?}",
202 buffer.id(),
203 buffer.read(cx).text()
204 );
205 buffers.last().unwrap()
206 } else {
207 buffers.choose(rng).unwrap()
208 };
209
210 let buffer = buffer_handle.read(cx);
211 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
212 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
213 let header_height = rng.gen_range(0..=5);
214 log::info!(
215 "Inserting excerpt from buffer {} with header height {} and range {:?}: {:?}",
216 buffer_handle.id(),
217 header_height,
218 start_ix..end_ix,
219 &buffer.text()[start_ix..end_ix]
220 );
221
222 multibuffer.push_excerpt(
223 ExcerptProperties {
224 buffer: buffer_handle,
225 range: start_ix..end_ix,
226 },
227 cx,
228 );
229 }
230 multibuffer
231 })
232 }
233
234 pub fn replica_id(&self) -> ReplicaId {
235 self.replica_id
236 }
237
238 pub fn snapshot(&self, cx: &AppContext) -> MultiBufferSnapshot {
239 self.sync(cx);
240 self.snapshot.borrow().clone()
241 }
242
243 pub fn read(&self, cx: &AppContext) -> Ref<MultiBufferSnapshot> {
244 self.sync(cx);
245 self.snapshot.borrow()
246 }
247
248 pub fn as_singleton(&self) -> Option<ModelHandle<Buffer>> {
249 if self.singleton {
250 return Some(
251 self.buffers
252 .borrow()
253 .values()
254 .next()
255 .unwrap()
256 .buffer
257 .clone(),
258 );
259 } else {
260 None
261 }
262 }
263
264 pub fn subscribe(&mut self) -> Subscription {
265 self.subscriptions.subscribe()
266 }
267
268 pub fn edit<I, S, T>(&mut self, ranges: I, new_text: T, cx: &mut ModelContext<Self>)
269 where
270 I: IntoIterator<Item = Range<S>>,
271 S: ToOffset,
272 T: Into<String>,
273 {
274 self.edit_internal(ranges, new_text, false, cx)
275 }
276
277 pub fn edit_with_autoindent<I, S, T>(
278 &mut self,
279 ranges: I,
280 new_text: T,
281 cx: &mut ModelContext<Self>,
282 ) where
283 I: IntoIterator<Item = Range<S>>,
284 S: ToOffset,
285 T: Into<String>,
286 {
287 self.edit_internal(ranges, new_text, true, cx)
288 }
289
290 pub fn edit_internal<I, S, T>(
291 &mut self,
292 ranges_iter: I,
293 new_text: T,
294 autoindent: bool,
295 cx: &mut ModelContext<Self>,
296 ) where
297 I: IntoIterator<Item = Range<S>>,
298 S: ToOffset,
299 T: Into<String>,
300 {
301 if let Some(buffer) = self.as_singleton() {
302 let snapshot = self.read(cx);
303 let ranges = ranges_iter
304 .into_iter()
305 .map(|range| range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot));
306 return buffer.update(cx, |buffer, cx| {
307 if autoindent {
308 buffer.edit_with_autoindent(ranges, new_text, cx)
309 } else {
310 buffer.edit(ranges, new_text, cx)
311 }
312 });
313 }
314
315 let snapshot = self.read(cx);
316 let mut buffer_edits: HashMap<usize, Vec<(Range<usize>, bool)>> = Default::default();
317 let mut cursor = snapshot.excerpts.cursor::<usize>();
318 for range in ranges_iter {
319 let start = range.start.to_offset(&snapshot);
320 let end = range.end.to_offset(&snapshot);
321 cursor.seek(&start, Bias::Right, &());
322 if cursor.item().is_none() && start == *cursor.start() {
323 cursor.prev(&());
324 }
325 let start_excerpt = cursor.item().expect("start offset out of bounds");
326 let start_overshoot = start - cursor.start();
327 let buffer_start =
328 start_excerpt.range.start.to_offset(&start_excerpt.buffer) + start_overshoot;
329
330 cursor.seek(&end, Bias::Right, &());
331 if cursor.item().is_none() && end == *cursor.start() {
332 cursor.prev(&());
333 }
334 let end_excerpt = cursor.item().expect("end offset out of bounds");
335 let end_overshoot = end - cursor.start();
336 let buffer_end = end_excerpt.range.start.to_offset(&end_excerpt.buffer) + end_overshoot;
337
338 if start_excerpt.id == end_excerpt.id {
339 buffer_edits
340 .entry(start_excerpt.buffer_id)
341 .or_insert(Vec::new())
342 .push((buffer_start..buffer_end, true));
343 } else {
344 let start_excerpt_range =
345 buffer_start..start_excerpt.range.end.to_offset(&start_excerpt.buffer);
346 let end_excerpt_range =
347 end_excerpt.range.start.to_offset(&end_excerpt.buffer)..buffer_end;
348 buffer_edits
349 .entry(start_excerpt.buffer_id)
350 .or_insert(Vec::new())
351 .push((start_excerpt_range, true));
352 buffer_edits
353 .entry(end_excerpt.buffer_id)
354 .or_insert(Vec::new())
355 .push((end_excerpt_range, false));
356
357 cursor.seek(&start, Bias::Right, &());
358 cursor.next(&());
359 while let Some(excerpt) = cursor.item() {
360 if excerpt.id == end_excerpt.id {
361 break;
362 }
363 buffer_edits
364 .entry(excerpt.buffer_id)
365 .or_insert(Vec::new())
366 .push((excerpt.range.to_offset(&excerpt.buffer), false));
367 cursor.next(&());
368 }
369 }
370 }
371
372 let new_text = new_text.into();
373 for (buffer_id, mut edits) in buffer_edits {
374 edits.sort_unstable_by_key(|(range, _)| range.start);
375 self.buffers.borrow()[&buffer_id]
376 .buffer
377 .update(cx, |buffer, cx| {
378 let mut edits = edits.into_iter().peekable();
379 let mut insertions = Vec::new();
380 let mut deletions = Vec::new();
381 while let Some((mut range, mut is_insertion)) = edits.next() {
382 while let Some((next_range, next_is_insertion)) = edits.peek() {
383 if range.end >= next_range.start {
384 range.end = cmp::max(next_range.end, range.end);
385 is_insertion |= *next_is_insertion;
386 edits.next();
387 } else {
388 break;
389 }
390 }
391
392 if is_insertion {
393 insertions.push(
394 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
395 );
396 } else if !range.is_empty() {
397 deletions.push(
398 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
399 );
400 }
401 }
402
403 if autoindent {
404 buffer.edit_with_autoindent(deletions, "", cx);
405 buffer.edit_with_autoindent(insertions, new_text.clone(), cx);
406 } else {
407 buffer.edit(deletions, "", cx);
408 buffer.edit(insertions, new_text.clone(), cx);
409 }
410 })
411 }
412 }
413
414 pub fn start_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
415 self.start_transaction_at(Instant::now(), cx)
416 }
417
418 pub(crate) fn start_transaction_at(
419 &mut self,
420 now: Instant,
421 cx: &mut ModelContext<Self>,
422 ) -> Option<TransactionId> {
423 if let Some(buffer) = self.as_singleton() {
424 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
425 }
426
427 for BufferState { buffer, .. } in self.buffers.borrow().values() {
428 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
429 }
430 self.history.start_transaction(now)
431 }
432
433 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
434 self.end_transaction_at(Instant::now(), cx)
435 }
436
437 pub(crate) fn end_transaction_at(
438 &mut self,
439 now: Instant,
440 cx: &mut ModelContext<Self>,
441 ) -> Option<TransactionId> {
442 if let Some(buffer) = self.as_singleton() {
443 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
444 }
445
446 let mut buffer_transactions = HashSet::default();
447 for BufferState { buffer, .. } in self.buffers.borrow().values() {
448 if let Some(transaction_id) =
449 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
450 {
451 buffer_transactions.insert((buffer.id(), transaction_id));
452 }
453 }
454
455 if self.history.end_transaction(now, buffer_transactions) {
456 let transaction_id = self.history.group().unwrap();
457 Some(transaction_id)
458 } else {
459 None
460 }
461 }
462
463 pub fn avoid_grouping_next_transaction(&mut self, cx: &mut ModelContext<Self>) {
464 for BufferState { buffer, .. } in self.buffers.borrow().values() {
465 buffer.update(cx, |buffer, _| buffer.avoid_grouping_next_transaction());
466 }
467 }
468
469 pub fn set_active_selections(
470 &mut self,
471 selections: &[Selection<Anchor>],
472 cx: &mut ModelContext<Self>,
473 ) {
474 let mut selections_by_buffer: HashMap<usize, Vec<Selection<text::Anchor>>> =
475 Default::default();
476 let snapshot = self.read(cx);
477 let mut cursor = snapshot.excerpts.cursor::<Option<&ExcerptId>>();
478 for selection in selections {
479 cursor.seek(&Some(&selection.start.excerpt_id), Bias::Left, &());
480 while let Some(excerpt) = cursor.item() {
481 if excerpt.id > selection.end.excerpt_id {
482 break;
483 }
484
485 let mut start = excerpt.range.start.clone();
486 let mut end = excerpt.range.end.clone();
487 if excerpt.id == selection.start.excerpt_id {
488 start = selection.start.text_anchor.clone();
489 }
490 if excerpt.id == selection.end.excerpt_id {
491 end = selection.end.text_anchor.clone();
492 }
493 selections_by_buffer
494 .entry(excerpt.buffer_id)
495 .or_default()
496 .push(Selection {
497 id: selection.id,
498 start,
499 end,
500 reversed: selection.reversed,
501 goal: selection.goal,
502 });
503
504 cursor.next(&());
505 }
506 }
507
508 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
509 if !selections_by_buffer.contains_key(buffer_id) {
510 buffer_state
511 .buffer
512 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
513 }
514 }
515
516 for (buffer_id, mut selections) in selections_by_buffer {
517 self.buffers.borrow()[&buffer_id]
518 .buffer
519 .update(cx, |buffer, cx| {
520 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer).unwrap());
521 let mut selections = selections.into_iter().peekable();
522 let merged_selections = Arc::from_iter(iter::from_fn(|| {
523 let mut selection = selections.next()?;
524 while let Some(next_selection) = selections.peek() {
525 if selection
526 .end
527 .cmp(&next_selection.start, buffer)
528 .unwrap()
529 .is_ge()
530 {
531 let next_selection = selections.next().unwrap();
532 if next_selection
533 .end
534 .cmp(&selection.end, buffer)
535 .unwrap()
536 .is_ge()
537 {
538 selection.end = next_selection.end;
539 }
540 } else {
541 break;
542 }
543 }
544 Some(selection)
545 }));
546 buffer.set_active_selections(merged_selections, cx);
547 });
548 }
549 }
550
551 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
552 for buffer in self.buffers.borrow().values() {
553 buffer
554 .buffer
555 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
556 }
557 }
558
559 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
560 if let Some(buffer) = self.as_singleton() {
561 return buffer.update(cx, |buffer, cx| buffer.undo(cx));
562 }
563
564 while let Some(transaction) = self.history.pop_undo() {
565 let mut undone = false;
566 for (buffer_id, buffer_transaction_id) in &transaction.buffer_transactions {
567 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(&buffer_id) {
568 undone |= buffer.update(cx, |buf, cx| {
569 buf.undo_transaction(*buffer_transaction_id, cx)
570 });
571 }
572 }
573
574 if undone {
575 return Some(transaction.id);
576 }
577 }
578
579 None
580 }
581
582 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
583 if let Some(buffer) = self.as_singleton() {
584 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
585 }
586
587 while let Some(transaction) = self.history.pop_redo() {
588 let mut redone = false;
589 for (buffer_id, buffer_transaction_id) in &transaction.buffer_transactions {
590 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(&buffer_id) {
591 redone |= buffer.update(cx, |buf, cx| {
592 buf.redo_transaction(*buffer_transaction_id, cx)
593 });
594 }
595 }
596
597 if redone {
598 return Some(transaction.id);
599 }
600 }
601
602 None
603 }
604
605 pub fn push_excerpt<O>(
606 &mut self,
607 props: ExcerptProperties<O>,
608 cx: &mut ModelContext<Self>,
609 ) -> ExcerptId
610 where
611 O: text::ToOffset,
612 {
613 self.insert_excerpt_after(&ExcerptId::max(), props, cx)
614 }
615
616 pub fn insert_excerpt_after<O>(
617 &mut self,
618 prev_excerpt_id: &ExcerptId,
619 props: ExcerptProperties<O>,
620 cx: &mut ModelContext<Self>,
621 ) -> ExcerptId
622 where
623 O: text::ToOffset,
624 {
625 assert_eq!(self.history.transaction_depth, 0);
626 self.sync(cx);
627
628 let buffer_snapshot = props.buffer.read(cx).snapshot();
629 let range = buffer_snapshot.anchor_before(&props.range.start)
630 ..buffer_snapshot.anchor_after(&props.range.end);
631 let mut snapshot = self.snapshot.borrow_mut();
632 let mut cursor = snapshot.excerpts.cursor::<Option<&ExcerptId>>();
633 let mut new_excerpts = cursor.slice(&Some(prev_excerpt_id), Bias::Right, &());
634
635 let mut prev_id = ExcerptId::min();
636 let edit_start = new_excerpts.summary().text.bytes;
637 new_excerpts.update_last(
638 |excerpt| {
639 excerpt.has_trailing_newline = true;
640 prev_id = excerpt.id.clone();
641 },
642 &(),
643 );
644
645 let mut next_id = ExcerptId::max();
646 if let Some(next_excerpt) = cursor.item() {
647 next_id = next_excerpt.id.clone();
648 }
649
650 let id = ExcerptId::between(&prev_id, &next_id);
651
652 let mut buffers = self.buffers.borrow_mut();
653 let buffer_state = buffers
654 .entry(props.buffer.id())
655 .or_insert_with(|| BufferState {
656 last_version: buffer_snapshot.version().clone(),
657 last_parse_count: buffer_snapshot.parse_count(),
658 last_selections_update_count: buffer_snapshot.selections_update_count(),
659 last_diagnostics_update_count: buffer_snapshot.diagnostics_update_count(),
660 excerpts: Default::default(),
661 _subscriptions: [
662 cx.observe(&props.buffer, |_, _, cx| cx.notify()),
663 cx.subscribe(&props.buffer, Self::on_buffer_event),
664 ],
665 buffer: props.buffer.clone(),
666 });
667 if let Err(ix) = buffer_state.excerpts.binary_search(&id) {
668 buffer_state.excerpts.insert(ix, id.clone());
669 }
670
671 let excerpt = Excerpt::new(
672 id.clone(),
673 props.buffer.id(),
674 buffer_snapshot,
675 range,
676 cursor.item().is_some(),
677 );
678 new_excerpts.push(excerpt, &());
679 let edit_end = new_excerpts.summary().text.bytes;
680
681 new_excerpts.push_tree(cursor.suffix(&()), &());
682 drop(cursor);
683 snapshot.excerpts = new_excerpts;
684
685 self.subscriptions.publish_mut([Edit {
686 old: edit_start..edit_start,
687 new: edit_start..edit_end,
688 }]);
689
690 cx.notify();
691 id
692 }
693
694 pub fn excerpt_ids_for_buffer(&self, buffer: &ModelHandle<Buffer>) -> Vec<ExcerptId> {
695 self.buffers
696 .borrow()
697 .get(&buffer.id())
698 .map_or(Vec::new(), |state| state.excerpts.clone())
699 }
700
701 pub fn excerpted_buffers<'a, T: ToOffset>(
702 &'a self,
703 range: Range<T>,
704 cx: &AppContext,
705 ) -> Vec<(ModelHandle<Buffer>, Range<usize>)> {
706 let snapshot = self.snapshot(cx);
707 let start = range.start.to_offset(&snapshot);
708 let end = range.end.to_offset(&snapshot);
709
710 let mut result = Vec::new();
711 let mut cursor = snapshot.excerpts.cursor::<usize>();
712 cursor.seek(&start, Bias::Right, &());
713 while let Some(excerpt) = cursor.item() {
714 if *cursor.start() > end {
715 break;
716 }
717
718 let mut end_before_newline = cursor.end(&());
719 if excerpt.has_trailing_newline {
720 end_before_newline -= 1;
721 }
722 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
723 let start = excerpt_start + (cmp::max(start, *cursor.start()) - *cursor.start());
724 let end = excerpt_start + (cmp::min(end, end_before_newline) - *cursor.start());
725 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
726 result.push((buffer, start..end));
727 cursor.next(&());
728 }
729
730 result
731 }
732
733 pub fn remove_excerpts<'a>(
734 &mut self,
735 excerpt_ids: impl IntoIterator<Item = &'a ExcerptId>,
736 cx: &mut ModelContext<Self>,
737 ) {
738 let mut buffers = self.buffers.borrow_mut();
739 let mut snapshot = self.snapshot.borrow_mut();
740 let mut new_excerpts = SumTree::new();
741 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
742 let mut edits = Vec::new();
743 let mut excerpt_ids = excerpt_ids.into_iter().peekable();
744
745 while let Some(mut excerpt_id) = excerpt_ids.next() {
746 // Seek to the next excerpt to remove, preserving any preceding excerpts.
747 new_excerpts.push_tree(cursor.slice(&Some(excerpt_id), Bias::Left, &()), &());
748 if let Some(mut excerpt) = cursor.item() {
749 if excerpt.id != *excerpt_id {
750 continue;
751 }
752 let mut old_start = cursor.start().1;
753
754 // Skip over the removed excerpt.
755 loop {
756 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
757 buffer_state.excerpts.retain(|id| id != excerpt_id);
758 if buffer_state.excerpts.is_empty() {
759 buffers.remove(&excerpt.buffer_id);
760 }
761 }
762 cursor.next(&());
763
764 // Skip over any subsequent excerpts that are also removed.
765 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
766 if let Some(next_excerpt) = cursor.item() {
767 if next_excerpt.id == *next_excerpt_id {
768 excerpt = next_excerpt;
769 excerpt_id = excerpt_ids.next().unwrap();
770 continue;
771 }
772 }
773 }
774
775 break;
776 }
777
778 // When removing the last excerpt, remove the trailing newline from
779 // the previous excerpt.
780 if cursor.item().is_none() && old_start > 0 {
781 old_start -= 1;
782 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
783 }
784
785 // Push an edit for the removal of this run of excerpts.
786 let old_end = cursor.start().1;
787 let new_start = new_excerpts.summary().text.bytes;
788 edits.push(Edit {
789 old: old_start..old_end,
790 new: new_start..new_start,
791 });
792 }
793 }
794 new_excerpts.push_tree(cursor.suffix(&()), &());
795 drop(cursor);
796 snapshot.excerpts = new_excerpts;
797 self.subscriptions.publish_mut(edits);
798 cx.notify();
799 }
800
801 pub fn text_anchor_for_position<'a, T: ToOffset>(
802 &'a self,
803 position: T,
804 cx: &AppContext,
805 ) -> (ModelHandle<Buffer>, language::Anchor) {
806 let snapshot = self.read(cx);
807 let anchor = snapshot.anchor_before(position);
808 (
809 self.buffers.borrow()[&anchor.buffer_id].buffer.clone(),
810 anchor.text_anchor,
811 )
812 }
813
814 fn on_buffer_event(
815 &mut self,
816 _: ModelHandle<Buffer>,
817 event: &Event,
818 cx: &mut ModelContext<Self>,
819 ) {
820 cx.emit(event.clone());
821 }
822
823 pub fn format(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
824 let mut format_tasks = Vec::new();
825 for BufferState { buffer, .. } in self.buffers.borrow().values() {
826 format_tasks.push(buffer.update(cx, |buffer, cx| buffer.format(cx)));
827 }
828
829 cx.spawn(|_, _| async move {
830 for format in format_tasks {
831 format.await?;
832 }
833 Ok(())
834 })
835 }
836
837 pub fn save(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
838 let mut save_tasks = Vec::new();
839 for BufferState { buffer, .. } in self.buffers.borrow().values() {
840 save_tasks.push(buffer.update(cx, |buffer, cx| buffer.save(cx)));
841 }
842
843 cx.spawn(|_, _| async move {
844 for save in save_tasks {
845 save.await?;
846 }
847 Ok(())
848 })
849 }
850
851 pub fn completions<T>(
852 &self,
853 position: T,
854 cx: &mut ModelContext<Self>,
855 ) -> Task<Result<Vec<Completion>>>
856 where
857 T: ToOffset,
858 {
859 let (buffer, text_anchor) = self.text_anchor_for_position(position, cx);
860 buffer.update(cx, |buffer, cx| buffer.completions(text_anchor, cx))
861 }
862
863 pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
864 self.buffers
865 .borrow()
866 .values()
867 .next()
868 .and_then(|state| state.buffer.read(cx).language())
869 }
870
871 pub fn file<'a>(&self, cx: &'a AppContext) -> Option<&'a dyn File> {
872 self.as_singleton()?.read(cx).file()
873 }
874
875 #[cfg(test)]
876 pub fn is_parsing(&self, cx: &AppContext) -> bool {
877 self.as_singleton().unwrap().read(cx).is_parsing()
878 }
879
880 fn sync(&self, cx: &AppContext) {
881 let mut snapshot = self.snapshot.borrow_mut();
882 let mut excerpts_to_edit = Vec::new();
883 let mut reparsed = false;
884 let mut diagnostics_updated = false;
885 let mut is_dirty = false;
886 let mut has_conflict = false;
887 let mut buffers = self.buffers.borrow_mut();
888 for buffer_state in buffers.values_mut() {
889 let buffer = buffer_state.buffer.read(cx);
890 let version = buffer.version();
891 let parse_count = buffer.parse_count();
892 let selections_update_count = buffer.selections_update_count();
893 let diagnostics_update_count = buffer.diagnostics_update_count();
894
895 let buffer_edited = version.changed_since(&buffer_state.last_version);
896 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
897 let buffer_selections_updated =
898 selections_update_count > buffer_state.last_selections_update_count;
899 let buffer_diagnostics_updated =
900 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
901 if buffer_edited
902 || buffer_reparsed
903 || buffer_selections_updated
904 || buffer_diagnostics_updated
905 {
906 buffer_state.last_version = version;
907 buffer_state.last_parse_count = parse_count;
908 buffer_state.last_selections_update_count = selections_update_count;
909 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
910 excerpts_to_edit.extend(
911 buffer_state
912 .excerpts
913 .iter()
914 .map(|excerpt_id| (excerpt_id, buffer_state.buffer.clone(), buffer_edited)),
915 );
916 }
917
918 reparsed |= buffer_reparsed;
919 diagnostics_updated |= buffer_diagnostics_updated;
920 is_dirty |= buffer.is_dirty();
921 has_conflict |= buffer.has_conflict();
922 }
923 if reparsed {
924 snapshot.parse_count += 1;
925 }
926 if diagnostics_updated {
927 snapshot.diagnostics_update_count += 1;
928 }
929 snapshot.is_dirty = is_dirty;
930 snapshot.has_conflict = has_conflict;
931
932 excerpts_to_edit.sort_unstable_by_key(|(excerpt_id, _, _)| *excerpt_id);
933
934 let mut edits = Vec::new();
935 let mut new_excerpts = SumTree::new();
936 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
937
938 for (id, buffer, buffer_edited) in excerpts_to_edit {
939 new_excerpts.push_tree(cursor.slice(&Some(id), Bias::Left, &()), &());
940 let old_excerpt = cursor.item().unwrap();
941 let buffer_id = buffer.id();
942 let buffer = buffer.read(cx);
943
944 let mut new_excerpt;
945 if buffer_edited {
946 edits.extend(
947 buffer
948 .edits_since_in_range::<usize>(
949 old_excerpt.buffer.version(),
950 old_excerpt.range.clone(),
951 )
952 .map(|mut edit| {
953 let excerpt_old_start = cursor.start().1;
954 let excerpt_new_start = new_excerpts.summary().text.bytes;
955 edit.old.start += excerpt_old_start;
956 edit.old.end += excerpt_old_start;
957 edit.new.start += excerpt_new_start;
958 edit.new.end += excerpt_new_start;
959 edit
960 }),
961 );
962
963 new_excerpt = Excerpt::new(
964 id.clone(),
965 buffer_id,
966 buffer.snapshot(),
967 old_excerpt.range.clone(),
968 old_excerpt.has_trailing_newline,
969 );
970 } else {
971 new_excerpt = old_excerpt.clone();
972 new_excerpt.buffer = buffer.snapshot();
973 }
974
975 new_excerpts.push(new_excerpt, &());
976 cursor.next(&());
977 }
978 new_excerpts.push_tree(cursor.suffix(&()), &());
979
980 drop(cursor);
981 snapshot.excerpts = new_excerpts;
982
983 self.subscriptions.publish(edits);
984 }
985}
986
987#[cfg(any(test, feature = "test-support"))]
988impl MultiBuffer {
989 pub fn randomly_edit(
990 &mut self,
991 rng: &mut impl rand::Rng,
992 count: usize,
993 cx: &mut ModelContext<Self>,
994 ) {
995 use text::RandomCharIter;
996
997 let snapshot = self.read(cx);
998 let mut old_ranges: Vec<Range<usize>> = Vec::new();
999 for _ in 0..count {
1000 let last_end = old_ranges.last().map_or(0, |last_range| last_range.end + 1);
1001 if last_end > snapshot.len() {
1002 break;
1003 }
1004 let end_ix = snapshot.clip_offset(rng.gen_range(0..=last_end), Bias::Right);
1005 let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1006 old_ranges.push(start_ix..end_ix);
1007 }
1008 let new_text_len = rng.gen_range(0..10);
1009 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1010 log::info!("mutating multi-buffer at {:?}: {:?}", old_ranges, new_text);
1011 drop(snapshot);
1012
1013 self.edit(old_ranges.iter().cloned(), new_text.as_str(), cx);
1014 }
1015}
1016
1017impl Entity for MultiBuffer {
1018 type Event = language::Event;
1019}
1020
1021impl MultiBufferSnapshot {
1022 pub fn text(&self) -> String {
1023 self.chunks(0..self.len(), None)
1024 .map(|chunk| chunk.text)
1025 .collect()
1026 }
1027
1028 pub fn reversed_chars_at<'a, T: ToOffset>(
1029 &'a self,
1030 position: T,
1031 ) -> impl Iterator<Item = char> + 'a {
1032 let mut offset = position.to_offset(self);
1033 let mut cursor = self.excerpts.cursor::<usize>();
1034 cursor.seek(&offset, Bias::Left, &());
1035 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1036 let end_before_footer = cursor.start() + excerpt.text_summary.bytes;
1037 let start = excerpt.range.start.to_offset(&excerpt.buffer);
1038 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1039 excerpt.buffer.reversed_chunks_in_range(start..end)
1040 });
1041 iter::from_fn(move || {
1042 if offset == *cursor.start() {
1043 cursor.prev(&());
1044 let excerpt = cursor.item()?;
1045 excerpt_chunks = Some(
1046 excerpt
1047 .buffer
1048 .reversed_chunks_in_range(excerpt.range.clone()),
1049 );
1050 }
1051
1052 let excerpt = cursor.item().unwrap();
1053 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1054 offset -= 1;
1055 Some("\n")
1056 } else {
1057 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1058 offset -= chunk.len();
1059 Some(chunk)
1060 }
1061 })
1062 .flat_map(|c| c.chars().rev())
1063 }
1064
1065 pub fn chars_at<'a, T: ToOffset>(&'a self, position: T) -> impl Iterator<Item = char> + 'a {
1066 let offset = position.to_offset(self);
1067 self.text_for_range(offset..self.len())
1068 .flat_map(|chunk| chunk.chars())
1069 }
1070
1071 pub fn text_for_range<'a, T: ToOffset>(
1072 &'a self,
1073 range: Range<T>,
1074 ) -> impl Iterator<Item = &'a str> {
1075 self.chunks(range, None).map(|chunk| chunk.text)
1076 }
1077
1078 pub fn is_line_blank(&self, row: u32) -> bool {
1079 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1080 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1081 }
1082
1083 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1084 where
1085 T: ToOffset,
1086 {
1087 let position = position.to_offset(self);
1088 position == self.clip_offset(position, Bias::Left)
1089 && self
1090 .bytes_in_range(position..self.len())
1091 .flatten()
1092 .copied()
1093 .take(needle.len())
1094 .eq(needle.bytes())
1095 }
1096
1097 fn as_singleton(&self) -> Option<&Excerpt> {
1098 if self.singleton {
1099 self.excerpts.iter().next()
1100 } else {
1101 None
1102 }
1103 }
1104
1105 pub fn len(&self) -> usize {
1106 self.excerpts.summary().text.bytes
1107 }
1108
1109 pub fn max_buffer_row(&self) -> u32 {
1110 self.excerpts.summary().max_buffer_row
1111 }
1112
1113 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1114 if let Some(excerpt) = self.as_singleton() {
1115 return excerpt.buffer.clip_offset(offset, bias);
1116 }
1117
1118 let mut cursor = self.excerpts.cursor::<usize>();
1119 cursor.seek(&offset, Bias::Right, &());
1120 let overshoot = if let Some(excerpt) = cursor.item() {
1121 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1122 let buffer_offset = excerpt
1123 .buffer
1124 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1125 buffer_offset.saturating_sub(excerpt_start)
1126 } else {
1127 0
1128 };
1129 cursor.start() + overshoot
1130 }
1131
1132 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1133 if let Some(excerpt) = self.as_singleton() {
1134 return excerpt.buffer.clip_point(point, bias);
1135 }
1136
1137 let mut cursor = self.excerpts.cursor::<Point>();
1138 cursor.seek(&point, Bias::Right, &());
1139 let overshoot = if let Some(excerpt) = cursor.item() {
1140 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1141 let buffer_point = excerpt
1142 .buffer
1143 .clip_point(excerpt_start + (point - cursor.start()), bias);
1144 buffer_point.saturating_sub(excerpt_start)
1145 } else {
1146 Point::zero()
1147 };
1148 *cursor.start() + overshoot
1149 }
1150
1151 pub fn clip_point_utf16(&self, point: PointUtf16, bias: Bias) -> PointUtf16 {
1152 if let Some(excerpt) = self.as_singleton() {
1153 return excerpt.buffer.clip_point_utf16(point, bias);
1154 }
1155
1156 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1157 cursor.seek(&point, Bias::Right, &());
1158 let overshoot = if let Some(excerpt) = cursor.item() {
1159 let excerpt_start = excerpt
1160 .buffer
1161 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1162 let buffer_point = excerpt
1163 .buffer
1164 .clip_point_utf16(excerpt_start + (point - cursor.start()), bias);
1165 buffer_point.saturating_sub(excerpt_start)
1166 } else {
1167 PointUtf16::zero()
1168 };
1169 *cursor.start() + overshoot
1170 }
1171
1172 pub fn bytes_in_range<'a, T: ToOffset>(&'a self, range: Range<T>) -> MultiBufferBytes<'a> {
1173 let range = range.start.to_offset(self)..range.end.to_offset(self);
1174 let mut excerpts = self.excerpts.cursor::<usize>();
1175 excerpts.seek(&range.start, Bias::Right, &());
1176
1177 let mut chunk = &[][..];
1178 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1179 let mut excerpt_bytes = excerpt
1180 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1181 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1182 Some(excerpt_bytes)
1183 } else {
1184 None
1185 };
1186
1187 MultiBufferBytes {
1188 range,
1189 excerpts,
1190 excerpt_bytes,
1191 chunk,
1192 }
1193 }
1194
1195 pub fn buffer_rows<'a>(&'a self, start_row: u32) -> MultiBufferRows<'a> {
1196 let mut result = MultiBufferRows {
1197 buffer_row_range: 0..0,
1198 excerpts: self.excerpts.cursor(),
1199 };
1200 result.seek(start_row);
1201 result
1202 }
1203
1204 pub fn chunks<'a, T: ToOffset>(
1205 &'a self,
1206 range: Range<T>,
1207 theme: Option<&'a SyntaxTheme>,
1208 ) -> MultiBufferChunks<'a> {
1209 let range = range.start.to_offset(self)..range.end.to_offset(self);
1210 let mut chunks = MultiBufferChunks {
1211 range: range.clone(),
1212 excerpts: self.excerpts.cursor(),
1213 excerpt_chunks: None,
1214 theme,
1215 };
1216 chunks.seek(range.start);
1217 chunks
1218 }
1219
1220 pub fn offset_to_point(&self, offset: usize) -> Point {
1221 if let Some(excerpt) = self.as_singleton() {
1222 return excerpt.buffer.offset_to_point(offset);
1223 }
1224
1225 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1226 cursor.seek(&offset, Bias::Right, &());
1227 if let Some(excerpt) = cursor.item() {
1228 let (start_offset, start_point) = cursor.start();
1229 let overshoot = offset - start_offset;
1230 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1231 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1232 let buffer_point = excerpt
1233 .buffer
1234 .offset_to_point(excerpt_start_offset + overshoot);
1235 *start_point + (buffer_point - excerpt_start_point)
1236 } else {
1237 self.excerpts.summary().text.lines
1238 }
1239 }
1240
1241 pub fn point_to_offset(&self, point: Point) -> usize {
1242 if let Some(excerpt) = self.as_singleton() {
1243 return excerpt.buffer.point_to_offset(point);
1244 }
1245
1246 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1247 cursor.seek(&point, Bias::Right, &());
1248 if let Some(excerpt) = cursor.item() {
1249 let (start_point, start_offset) = cursor.start();
1250 let overshoot = point - start_point;
1251 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1252 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1253 let buffer_offset = excerpt
1254 .buffer
1255 .point_to_offset(excerpt_start_point + overshoot);
1256 *start_offset + buffer_offset - excerpt_start_offset
1257 } else {
1258 self.excerpts.summary().text.bytes
1259 }
1260 }
1261
1262 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1263 if let Some(excerpt) = self.as_singleton() {
1264 return excerpt.buffer.point_utf16_to_offset(point);
1265 }
1266
1267 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1268 cursor.seek(&point, Bias::Right, &());
1269 if let Some(excerpt) = cursor.item() {
1270 let (start_point, start_offset) = cursor.start();
1271 let overshoot = point - start_point;
1272 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1273 let excerpt_start_point = excerpt
1274 .buffer
1275 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1276 let buffer_offset = excerpt
1277 .buffer
1278 .point_utf16_to_offset(excerpt_start_point + overshoot);
1279 *start_offset + (buffer_offset - excerpt_start_offset)
1280 } else {
1281 self.excerpts.summary().text.bytes
1282 }
1283 }
1284
1285 pub fn indent_column_for_line(&self, row: u32) -> u32 {
1286 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
1287 buffer
1288 .indent_column_for_line(range.start.row)
1289 .min(range.end.column)
1290 .saturating_sub(range.start.column)
1291 } else {
1292 0
1293 }
1294 }
1295
1296 pub fn line_len(&self, row: u32) -> u32 {
1297 if let Some((_, range)) = self.buffer_line_for_row(row) {
1298 range.end.column - range.start.column
1299 } else {
1300 0
1301 }
1302 }
1303
1304 fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
1305 let mut cursor = self.excerpts.cursor::<Point>();
1306 cursor.seek(&Point::new(row, 0), Bias::Right, &());
1307 if let Some(excerpt) = cursor.item() {
1308 let overshoot = row - cursor.start().row;
1309 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1310 let excerpt_end = excerpt.range.end.to_point(&excerpt.buffer);
1311 let buffer_row = excerpt_start.row + overshoot;
1312 let line_start = Point::new(buffer_row, 0);
1313 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
1314 return Some((
1315 &excerpt.buffer,
1316 line_start.max(excerpt_start)..line_end.min(excerpt_end),
1317 ));
1318 }
1319 None
1320 }
1321
1322 pub fn max_point(&self) -> Point {
1323 self.text_summary().lines
1324 }
1325
1326 pub fn text_summary(&self) -> TextSummary {
1327 self.excerpts.summary().text
1328 }
1329
1330 pub fn text_summary_for_range<'a, D, O>(&'a self, range: Range<O>) -> D
1331 where
1332 D: TextDimension,
1333 O: ToOffset,
1334 {
1335 let mut summary = D::default();
1336 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1337 let mut cursor = self.excerpts.cursor::<usize>();
1338 cursor.seek(&range.start, Bias::Right, &());
1339 if let Some(excerpt) = cursor.item() {
1340 let mut end_before_newline = cursor.end(&());
1341 if excerpt.has_trailing_newline {
1342 end_before_newline -= 1;
1343 }
1344
1345 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1346 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
1347 let end_in_excerpt =
1348 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
1349 summary.add_assign(
1350 &excerpt
1351 .buffer
1352 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
1353 );
1354
1355 if range.end > end_before_newline {
1356 summary.add_assign(&D::from_text_summary(&TextSummary {
1357 bytes: 1,
1358 lines: Point::new(1 as u32, 0),
1359 lines_utf16: PointUtf16::new(1 as u32, 0),
1360 first_line_chars: 0,
1361 last_line_chars: 0,
1362 longest_row: 0,
1363 longest_row_chars: 0,
1364 }));
1365 }
1366
1367 cursor.next(&());
1368 }
1369
1370 if range.end > *cursor.start() {
1371 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
1372 &range.end,
1373 Bias::Right,
1374 &(),
1375 )));
1376 if let Some(excerpt) = cursor.item() {
1377 range.end = cmp::max(*cursor.start(), range.end);
1378
1379 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1380 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
1381 summary.add_assign(
1382 &excerpt
1383 .buffer
1384 .text_summary_for_range(excerpt_start..end_in_excerpt),
1385 );
1386 }
1387 }
1388
1389 summary
1390 }
1391
1392 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
1393 where
1394 D: TextDimension + Ord + Sub<D, Output = D>,
1395 {
1396 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1397 cursor.seek(&Some(&anchor.excerpt_id), Bias::Left, &());
1398 if cursor.item().is_none() {
1399 cursor.next(&());
1400 }
1401
1402 let mut position = D::from_text_summary(&cursor.start().text);
1403 if let Some(excerpt) = cursor.item() {
1404 if excerpt.id == anchor.excerpt_id && excerpt.buffer_id == anchor.buffer_id {
1405 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1406 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1407 let buffer_position = cmp::min(
1408 excerpt_buffer_end,
1409 anchor.text_anchor.summary::<D>(&excerpt.buffer),
1410 );
1411 if buffer_position > excerpt_buffer_start {
1412 position.add_assign(&(buffer_position - excerpt_buffer_start));
1413 }
1414 }
1415 }
1416 position
1417 }
1418
1419 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
1420 where
1421 D: TextDimension + Ord + Sub<D, Output = D>,
1422 I: 'a + IntoIterator<Item = &'a Anchor>,
1423 {
1424 let mut anchors = anchors.into_iter().peekable();
1425 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1426 let mut summaries = Vec::new();
1427 while let Some(anchor) = anchors.peek() {
1428 let excerpt_id = &anchor.excerpt_id;
1429 let buffer_id = anchor.buffer_id;
1430 let excerpt_anchors = iter::from_fn(|| {
1431 let anchor = anchors.peek()?;
1432 if anchor.excerpt_id == *excerpt_id && anchor.buffer_id == buffer_id {
1433 Some(&anchors.next().unwrap().text_anchor)
1434 } else {
1435 None
1436 }
1437 });
1438
1439 cursor.seek_forward(&Some(excerpt_id), Bias::Left, &());
1440 if cursor.item().is_none() {
1441 cursor.next(&());
1442 }
1443
1444 let position = D::from_text_summary(&cursor.start().text);
1445 if let Some(excerpt) = cursor.item() {
1446 if excerpt.id == *excerpt_id && excerpt.buffer_id == buffer_id {
1447 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1448 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1449 summaries.extend(
1450 excerpt
1451 .buffer
1452 .summaries_for_anchors::<D, _>(excerpt_anchors)
1453 .map(move |summary| {
1454 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
1455 let mut position = position.clone();
1456 let excerpt_buffer_start = excerpt_buffer_start.clone();
1457 if summary > excerpt_buffer_start {
1458 position.add_assign(&(summary - excerpt_buffer_start));
1459 }
1460 position
1461 }),
1462 );
1463 continue;
1464 }
1465 }
1466
1467 summaries.extend(excerpt_anchors.map(|_| position.clone()));
1468 }
1469
1470 summaries
1471 }
1472
1473 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
1474 where
1475 I: 'a + IntoIterator<Item = &'a Anchor>,
1476 {
1477 let mut anchors = anchors.into_iter().enumerate().peekable();
1478 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1479 let mut result = Vec::new();
1480 while let Some((_, anchor)) = anchors.peek() {
1481 let old_excerpt_id = &anchor.excerpt_id;
1482
1483 // Find the location where this anchor's excerpt should be.
1484 cursor.seek_forward(&Some(old_excerpt_id), Bias::Left, &());
1485 if cursor.item().is_none() {
1486 cursor.next(&());
1487 }
1488
1489 let next_excerpt = cursor.item();
1490 let prev_excerpt = cursor.prev_item();
1491
1492 // Process all of the anchors for this excerpt.
1493 while let Some((_, anchor)) = anchors.peek() {
1494 if anchor.excerpt_id != *old_excerpt_id {
1495 break;
1496 }
1497 let mut kept_position = false;
1498 let (anchor_ix, anchor) = anchors.next().unwrap();
1499 let mut anchor = anchor.clone();
1500
1501 // Leave min and max anchors unchanged.
1502 if *old_excerpt_id == ExcerptId::max() || *old_excerpt_id == ExcerptId::min() {
1503 kept_position = true;
1504 }
1505 // If the old excerpt still exists at this location, then leave
1506 // the anchor unchanged.
1507 else if next_excerpt.map_or(false, |excerpt| {
1508 excerpt.id == *old_excerpt_id && excerpt.contains(&anchor)
1509 }) {
1510 kept_position = true;
1511 }
1512 // If the old excerpt no longer exists at this location, then attempt to
1513 // find an equivalent position for this anchor in an adjacent excerpt.
1514 else {
1515 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
1516 if excerpt.contains(&anchor) {
1517 anchor.excerpt_id = excerpt.id.clone();
1518 kept_position = true;
1519 break;
1520 }
1521 }
1522 }
1523 // If there's no adjacent excerpt that contains the anchor's position,
1524 // then report that the anchor has lost its position.
1525 if !kept_position {
1526 anchor = if let Some(excerpt) = next_excerpt {
1527 let mut text_anchor = excerpt
1528 .range
1529 .start
1530 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1531 if text_anchor
1532 .cmp(&excerpt.range.end, &excerpt.buffer)
1533 .unwrap()
1534 .is_gt()
1535 {
1536 text_anchor = excerpt.range.end.clone();
1537 }
1538 Anchor {
1539 buffer_id: excerpt.buffer_id,
1540 excerpt_id: excerpt.id.clone(),
1541 text_anchor,
1542 }
1543 } else if let Some(excerpt) = prev_excerpt {
1544 let mut text_anchor = excerpt
1545 .range
1546 .end
1547 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1548 if text_anchor
1549 .cmp(&excerpt.range.start, &excerpt.buffer)
1550 .unwrap()
1551 .is_lt()
1552 {
1553 text_anchor = excerpt.range.start.clone();
1554 }
1555 Anchor {
1556 buffer_id: excerpt.buffer_id,
1557 excerpt_id: excerpt.id.clone(),
1558 text_anchor,
1559 }
1560 } else if anchor.text_anchor.bias == Bias::Left {
1561 Anchor::min()
1562 } else {
1563 Anchor::max()
1564 };
1565 }
1566
1567 result.push((anchor_ix, anchor, kept_position));
1568 }
1569 }
1570 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self).unwrap());
1571 result
1572 }
1573
1574 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
1575 self.anchor_at(position, Bias::Left)
1576 }
1577
1578 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
1579 self.anchor_at(position, Bias::Right)
1580 }
1581
1582 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
1583 let offset = position.to_offset(self);
1584 if let Some(excerpt) = self.as_singleton() {
1585 return Anchor {
1586 buffer_id: excerpt.buffer_id,
1587 excerpt_id: excerpt.id.clone(),
1588 text_anchor: excerpt.buffer.anchor_at(offset, bias),
1589 };
1590 }
1591
1592 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1593 cursor.seek(&offset, Bias::Right, &());
1594 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
1595 cursor.prev(&());
1596 }
1597 if let Some(excerpt) = cursor.item() {
1598 let mut overshoot = offset.saturating_sub(cursor.start().0);
1599 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
1600 overshoot -= 1;
1601 bias = Bias::Right;
1602 }
1603
1604 let buffer_start = excerpt.range.start.to_offset(&excerpt.buffer);
1605 let text_anchor =
1606 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
1607 Anchor {
1608 buffer_id: excerpt.buffer_id,
1609 excerpt_id: excerpt.id.clone(),
1610 text_anchor,
1611 }
1612 } else if offset == 0 && bias == Bias::Left {
1613 Anchor::min()
1614 } else {
1615 Anchor::max()
1616 }
1617 }
1618
1619 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
1620 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1621 cursor.seek(&Some(&excerpt_id), Bias::Left, &());
1622 if let Some(excerpt) = cursor.item() {
1623 if excerpt.id == excerpt_id {
1624 let text_anchor = excerpt.clip_anchor(text_anchor);
1625 drop(cursor);
1626 return Anchor {
1627 buffer_id: excerpt.buffer_id,
1628 excerpt_id,
1629 text_anchor,
1630 };
1631 }
1632 }
1633 panic!("excerpt not found");
1634 }
1635
1636 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
1637 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
1638 true
1639 } else if let Some((buffer_id, buffer_snapshot)) =
1640 self.buffer_snapshot_for_excerpt(&anchor.excerpt_id)
1641 {
1642 anchor.buffer_id == buffer_id && buffer_snapshot.can_resolve(&anchor.text_anchor)
1643 } else {
1644 false
1645 }
1646 }
1647
1648 pub fn range_contains_excerpt_boundary<T: ToOffset>(&self, range: Range<T>) -> bool {
1649 let start = range.start.to_offset(self);
1650 let end = range.end.to_offset(self);
1651 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1652 cursor.seek(&start, Bias::Right, &());
1653 let start_id = cursor
1654 .item()
1655 .or_else(|| cursor.prev_item())
1656 .map(|excerpt| &excerpt.id);
1657 cursor.seek_forward(&end, Bias::Right, &());
1658 let end_id = cursor
1659 .item()
1660 .or_else(|| cursor.prev_item())
1661 .map(|excerpt| &excerpt.id);
1662 start_id != end_id
1663 }
1664
1665 pub fn parse_count(&self) -> usize {
1666 self.parse_count
1667 }
1668
1669 pub fn enclosing_bracket_ranges<T: ToOffset>(
1670 &self,
1671 range: Range<T>,
1672 ) -> Option<(Range<usize>, Range<usize>)> {
1673 let range = range.start.to_offset(self)..range.end.to_offset(self);
1674
1675 let mut cursor = self.excerpts.cursor::<usize>();
1676 cursor.seek(&range.start, Bias::Right, &());
1677 let start_excerpt = cursor.item();
1678
1679 cursor.seek(&range.end, Bias::Right, &());
1680 let end_excerpt = cursor.item();
1681
1682 start_excerpt
1683 .zip(end_excerpt)
1684 .and_then(|(start_excerpt, end_excerpt)| {
1685 if start_excerpt.id != end_excerpt.id {
1686 return None;
1687 }
1688
1689 let excerpt_buffer_start =
1690 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1691 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1692
1693 let start_in_buffer =
1694 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1695 let end_in_buffer =
1696 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1697 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
1698 .buffer
1699 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
1700
1701 if start_bracket_range.start >= excerpt_buffer_start
1702 && end_bracket_range.end < excerpt_buffer_end
1703 {
1704 start_bracket_range.start =
1705 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
1706 start_bracket_range.end =
1707 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
1708 end_bracket_range.start =
1709 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
1710 end_bracket_range.end =
1711 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
1712 Some((start_bracket_range, end_bracket_range))
1713 } else {
1714 None
1715 }
1716 })
1717 }
1718
1719 pub fn diagnostics_update_count(&self) -> usize {
1720 self.diagnostics_update_count
1721 }
1722
1723 pub fn language(&self) -> Option<&Arc<Language>> {
1724 self.excerpts
1725 .iter()
1726 .next()
1727 .and_then(|excerpt| excerpt.buffer.language())
1728 }
1729
1730 pub fn is_dirty(&self) -> bool {
1731 self.is_dirty
1732 }
1733
1734 pub fn has_conflict(&self) -> bool {
1735 self.has_conflict
1736 }
1737
1738 pub fn diagnostic_group<'a, O>(
1739 &'a self,
1740 group_id: usize,
1741 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1742 where
1743 O: text::FromAnchor + 'a,
1744 {
1745 self.as_singleton()
1746 .into_iter()
1747 .flat_map(move |excerpt| excerpt.buffer.diagnostic_group(group_id))
1748 }
1749
1750 pub fn diagnostics_in_range<'a, T, O>(
1751 &'a self,
1752 range: Range<T>,
1753 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1754 where
1755 T: 'a + ToOffset,
1756 O: 'a + text::FromAnchor,
1757 {
1758 self.as_singleton().into_iter().flat_map(move |excerpt| {
1759 excerpt
1760 .buffer
1761 .diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1762 })
1763 }
1764
1765 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1766 let range = range.start.to_offset(self)..range.end.to_offset(self);
1767
1768 let mut cursor = self.excerpts.cursor::<usize>();
1769 cursor.seek(&range.start, Bias::Right, &());
1770 let start_excerpt = cursor.item();
1771
1772 cursor.seek(&range.end, Bias::Right, &());
1773 let end_excerpt = cursor.item();
1774
1775 start_excerpt
1776 .zip(end_excerpt)
1777 .and_then(|(start_excerpt, end_excerpt)| {
1778 if start_excerpt.id != end_excerpt.id {
1779 return None;
1780 }
1781
1782 let excerpt_buffer_start =
1783 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1784 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1785
1786 let start_in_buffer =
1787 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1788 let end_in_buffer =
1789 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1790 let mut ancestor_buffer_range = start_excerpt
1791 .buffer
1792 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1793 ancestor_buffer_range.start =
1794 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1795 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1796
1797 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1798 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1799 Some(start..end)
1800 })
1801 }
1802
1803 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
1804 let excerpt = self.as_singleton()?;
1805 let outline = excerpt.buffer.outline(theme)?;
1806 Some(Outline::new(
1807 outline
1808 .items
1809 .into_iter()
1810 .map(|item| OutlineItem {
1811 depth: item.depth,
1812 range: self.anchor_in_excerpt(excerpt.id.clone(), item.range.start)
1813 ..self.anchor_in_excerpt(excerpt.id.clone(), item.range.end),
1814 text: item.text,
1815 highlight_ranges: item.highlight_ranges,
1816 name_ranges: item.name_ranges,
1817 })
1818 .collect(),
1819 ))
1820 }
1821
1822 fn buffer_snapshot_for_excerpt<'a>(
1823 &'a self,
1824 excerpt_id: &'a ExcerptId,
1825 ) -> Option<(usize, &'a BufferSnapshot)> {
1826 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1827 cursor.seek(&Some(excerpt_id), Bias::Left, &());
1828 if let Some(excerpt) = cursor.item() {
1829 if excerpt.id == *excerpt_id {
1830 return Some((excerpt.buffer_id, &excerpt.buffer));
1831 }
1832 }
1833 None
1834 }
1835
1836 pub fn remote_selections_in_range<'a>(
1837 &'a self,
1838 range: &'a Range<Anchor>,
1839 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
1840 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1841 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
1842 cursor
1843 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
1844 .flat_map(move |excerpt| {
1845 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
1846 if excerpt.id == range.start.excerpt_id {
1847 query_range.start = range.start.text_anchor.clone();
1848 }
1849 if excerpt.id == range.end.excerpt_id {
1850 query_range.end = range.end.text_anchor.clone();
1851 }
1852
1853 excerpt
1854 .buffer
1855 .remote_selections_in_range(query_range)
1856 .flat_map(move |(replica_id, selections)| {
1857 selections.map(move |selection| {
1858 let mut start = Anchor {
1859 buffer_id: excerpt.buffer_id,
1860 excerpt_id: excerpt.id.clone(),
1861 text_anchor: selection.start.clone(),
1862 };
1863 let mut end = Anchor {
1864 buffer_id: excerpt.buffer_id,
1865 excerpt_id: excerpt.id.clone(),
1866 text_anchor: selection.end.clone(),
1867 };
1868 if range.start.cmp(&start, self).unwrap().is_gt() {
1869 start = range.start.clone();
1870 }
1871 if range.end.cmp(&end, self).unwrap().is_lt() {
1872 end = range.end.clone();
1873 }
1874
1875 (
1876 replica_id,
1877 Selection {
1878 id: selection.id,
1879 start,
1880 end,
1881 reversed: selection.reversed,
1882 goal: selection.goal,
1883 },
1884 )
1885 })
1886 })
1887 })
1888 }
1889}
1890
1891impl History {
1892 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
1893 self.transaction_depth += 1;
1894 if self.transaction_depth == 1 {
1895 let id = post_inc(&mut self.next_transaction_id);
1896 self.undo_stack.push(Transaction {
1897 id,
1898 buffer_transactions: Default::default(),
1899 first_edit_at: now,
1900 last_edit_at: now,
1901 });
1902 Some(id)
1903 } else {
1904 None
1905 }
1906 }
1907
1908 fn end_transaction(
1909 &mut self,
1910 now: Instant,
1911 buffer_transactions: HashSet<(usize, TransactionId)>,
1912 ) -> bool {
1913 assert_ne!(self.transaction_depth, 0);
1914 self.transaction_depth -= 1;
1915 if self.transaction_depth == 0 {
1916 if buffer_transactions.is_empty() {
1917 self.undo_stack.pop();
1918 false
1919 } else {
1920 let transaction = self.undo_stack.last_mut().unwrap();
1921 transaction.last_edit_at = now;
1922 transaction.buffer_transactions.extend(buffer_transactions);
1923 true
1924 }
1925 } else {
1926 false
1927 }
1928 }
1929
1930 fn pop_undo(&mut self) -> Option<&Transaction> {
1931 assert_eq!(self.transaction_depth, 0);
1932 if let Some(transaction) = self.undo_stack.pop() {
1933 self.redo_stack.push(transaction);
1934 self.redo_stack.last()
1935 } else {
1936 None
1937 }
1938 }
1939
1940 fn pop_redo(&mut self) -> Option<&Transaction> {
1941 assert_eq!(self.transaction_depth, 0);
1942 if let Some(transaction) = self.redo_stack.pop() {
1943 self.undo_stack.push(transaction);
1944 self.undo_stack.last()
1945 } else {
1946 None
1947 }
1948 }
1949
1950 fn group(&mut self) -> Option<TransactionId> {
1951 let mut new_len = self.undo_stack.len();
1952 let mut transactions = self.undo_stack.iter_mut();
1953
1954 if let Some(mut transaction) = transactions.next_back() {
1955 while let Some(prev_transaction) = transactions.next_back() {
1956 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
1957 {
1958 transaction = prev_transaction;
1959 new_len -= 1;
1960 } else {
1961 break;
1962 }
1963 }
1964 }
1965
1966 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
1967 if let Some(last_transaction) = transactions_to_keep.last_mut() {
1968 if let Some(transaction) = transactions_to_merge.last() {
1969 last_transaction.last_edit_at = transaction.last_edit_at;
1970 }
1971 }
1972
1973 self.undo_stack.truncate(new_len);
1974 self.undo_stack.last().map(|t| t.id)
1975 }
1976}
1977
1978impl Excerpt {
1979 fn new(
1980 id: ExcerptId,
1981 buffer_id: usize,
1982 buffer: BufferSnapshot,
1983 range: Range<text::Anchor>,
1984 has_trailing_newline: bool,
1985 ) -> Self {
1986 Excerpt {
1987 id,
1988 max_buffer_row: range.end.to_point(&buffer).row,
1989 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
1990 buffer_id,
1991 buffer,
1992 range,
1993 has_trailing_newline,
1994 }
1995 }
1996
1997 fn chunks_in_range<'a>(
1998 &'a self,
1999 range: Range<usize>,
2000 theme: Option<&'a SyntaxTheme>,
2001 ) -> ExcerptChunks<'a> {
2002 let content_start = self.range.start.to_offset(&self.buffer);
2003 let chunks_start = content_start + range.start;
2004 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2005
2006 let footer_height = if self.has_trailing_newline
2007 && range.start <= self.text_summary.bytes
2008 && range.end > self.text_summary.bytes
2009 {
2010 1
2011 } else {
2012 0
2013 };
2014
2015 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
2016
2017 ExcerptChunks {
2018 content_chunks,
2019 footer_height,
2020 }
2021 }
2022
2023 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
2024 let content_start = self.range.start.to_offset(&self.buffer);
2025 let bytes_start = content_start + range.start;
2026 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2027 let footer_height = if self.has_trailing_newline
2028 && range.start <= self.text_summary.bytes
2029 && range.end > self.text_summary.bytes
2030 {
2031 1
2032 } else {
2033 0
2034 };
2035 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
2036
2037 ExcerptBytes {
2038 content_bytes,
2039 footer_height,
2040 }
2041 }
2042
2043 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
2044 if text_anchor
2045 .cmp(&self.range.start, &self.buffer)
2046 .unwrap()
2047 .is_lt()
2048 {
2049 self.range.start.clone()
2050 } else if text_anchor
2051 .cmp(&self.range.end, &self.buffer)
2052 .unwrap()
2053 .is_gt()
2054 {
2055 self.range.end.clone()
2056 } else {
2057 text_anchor
2058 }
2059 }
2060
2061 fn contains(&self, anchor: &Anchor) -> bool {
2062 self.buffer_id == anchor.buffer_id
2063 && self
2064 .range
2065 .start
2066 .cmp(&anchor.text_anchor, &self.buffer)
2067 .unwrap()
2068 .is_le()
2069 && self
2070 .range
2071 .end
2072 .cmp(&anchor.text_anchor, &self.buffer)
2073 .unwrap()
2074 .is_ge()
2075 }
2076}
2077
2078impl fmt::Debug for Excerpt {
2079 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2080 f.debug_struct("Excerpt")
2081 .field("id", &self.id)
2082 .field("buffer_id", &self.buffer_id)
2083 .field("range", &self.range)
2084 .field("text_summary", &self.text_summary)
2085 .field("has_trailing_newline", &self.has_trailing_newline)
2086 .finish()
2087 }
2088}
2089
2090impl sum_tree::Item for Excerpt {
2091 type Summary = ExcerptSummary;
2092
2093 fn summary(&self) -> Self::Summary {
2094 let mut text = self.text_summary.clone();
2095 if self.has_trailing_newline {
2096 text += TextSummary::from("\n");
2097 }
2098 ExcerptSummary {
2099 excerpt_id: self.id.clone(),
2100 max_buffer_row: self.max_buffer_row,
2101 text,
2102 }
2103 }
2104}
2105
2106impl sum_tree::Summary for ExcerptSummary {
2107 type Context = ();
2108
2109 fn add_summary(&mut self, summary: &Self, _: &()) {
2110 debug_assert!(summary.excerpt_id > self.excerpt_id);
2111 self.excerpt_id = summary.excerpt_id.clone();
2112 self.text.add_summary(&summary.text, &());
2113 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
2114 }
2115}
2116
2117impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
2118 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2119 *self += &summary.text;
2120 }
2121}
2122
2123impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
2124 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2125 *self += summary.text.bytes;
2126 }
2127}
2128
2129impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
2130 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2131 Ord::cmp(self, &cursor_location.text.bytes)
2132 }
2133}
2134
2135impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
2136 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2137 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
2138 }
2139}
2140
2141impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
2142 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2143 *self += summary.text.lines;
2144 }
2145}
2146
2147impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
2148 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2149 *self += summary.text.lines_utf16
2150 }
2151}
2152
2153impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
2154 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2155 *self = Some(&summary.excerpt_id);
2156 }
2157}
2158
2159impl<'a> MultiBufferRows<'a> {
2160 pub fn seek(&mut self, row: u32) {
2161 self.buffer_row_range = 0..0;
2162
2163 self.excerpts
2164 .seek_forward(&Point::new(row, 0), Bias::Right, &());
2165 if self.excerpts.item().is_none() {
2166 self.excerpts.prev(&());
2167
2168 if self.excerpts.item().is_none() && row == 0 {
2169 self.buffer_row_range = 0..1;
2170 return;
2171 }
2172 }
2173
2174 if let Some(excerpt) = self.excerpts.item() {
2175 let overshoot = row - self.excerpts.start().row;
2176 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
2177 self.buffer_row_range.start = excerpt_start + overshoot;
2178 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
2179 }
2180 }
2181}
2182
2183impl<'a> Iterator for MultiBufferRows<'a> {
2184 type Item = Option<u32>;
2185
2186 fn next(&mut self) -> Option<Self::Item> {
2187 loop {
2188 if !self.buffer_row_range.is_empty() {
2189 let row = Some(self.buffer_row_range.start);
2190 self.buffer_row_range.start += 1;
2191 return Some(row);
2192 }
2193 self.excerpts.item()?;
2194 self.excerpts.next(&());
2195 let excerpt = self.excerpts.item()?;
2196 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
2197 self.buffer_row_range.end =
2198 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
2199 }
2200 }
2201}
2202
2203impl<'a> MultiBufferChunks<'a> {
2204 pub fn offset(&self) -> usize {
2205 self.range.start
2206 }
2207
2208 pub fn seek(&mut self, offset: usize) {
2209 self.range.start = offset;
2210 self.excerpts.seek(&offset, Bias::Right, &());
2211 if let Some(excerpt) = self.excerpts.item() {
2212 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2213 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
2214 self.theme,
2215 ));
2216 } else {
2217 self.excerpt_chunks = None;
2218 }
2219 }
2220}
2221
2222impl<'a> Iterator for MultiBufferChunks<'a> {
2223 type Item = Chunk<'a>;
2224
2225 fn next(&mut self) -> Option<Self::Item> {
2226 if self.range.is_empty() {
2227 None
2228 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
2229 self.range.start += chunk.text.len();
2230 Some(chunk)
2231 } else {
2232 self.excerpts.next(&());
2233 let excerpt = self.excerpts.item()?;
2234 self.excerpt_chunks = Some(
2235 excerpt.chunks_in_range(0..self.range.end - self.excerpts.start(), self.theme),
2236 );
2237 self.next()
2238 }
2239 }
2240}
2241
2242impl<'a> MultiBufferBytes<'a> {
2243 fn consume(&mut self, len: usize) {
2244 self.range.start += len;
2245 self.chunk = &self.chunk[len..];
2246
2247 if !self.range.is_empty() && self.chunk.is_empty() {
2248 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
2249 self.chunk = chunk;
2250 } else {
2251 self.excerpts.next(&());
2252 if let Some(excerpt) = self.excerpts.item() {
2253 let mut excerpt_bytes =
2254 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
2255 self.chunk = excerpt_bytes.next().unwrap();
2256 self.excerpt_bytes = Some(excerpt_bytes);
2257 }
2258 }
2259 }
2260 }
2261}
2262
2263impl<'a> Iterator for MultiBufferBytes<'a> {
2264 type Item = &'a [u8];
2265
2266 fn next(&mut self) -> Option<Self::Item> {
2267 let chunk = self.chunk;
2268 if chunk.is_empty() {
2269 None
2270 } else {
2271 self.consume(chunk.len());
2272 Some(chunk)
2273 }
2274 }
2275}
2276
2277impl<'a> io::Read for MultiBufferBytes<'a> {
2278 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2279 let len = cmp::min(buf.len(), self.chunk.len());
2280 buf[..len].copy_from_slice(&self.chunk[..len]);
2281 if len > 0 {
2282 self.consume(len);
2283 }
2284 Ok(len)
2285 }
2286}
2287
2288impl<'a> Iterator for ExcerptBytes<'a> {
2289 type Item = &'a [u8];
2290
2291 fn next(&mut self) -> Option<Self::Item> {
2292 if let Some(chunk) = self.content_bytes.next() {
2293 if !chunk.is_empty() {
2294 return Some(chunk);
2295 }
2296 }
2297
2298 if self.footer_height > 0 {
2299 let result = &NEWLINES[..self.footer_height];
2300 self.footer_height = 0;
2301 return Some(result);
2302 }
2303
2304 None
2305 }
2306}
2307
2308impl<'a> Iterator for ExcerptChunks<'a> {
2309 type Item = Chunk<'a>;
2310
2311 fn next(&mut self) -> Option<Self::Item> {
2312 if let Some(chunk) = self.content_chunks.next() {
2313 return Some(chunk);
2314 }
2315
2316 if self.footer_height > 0 {
2317 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2318 self.footer_height = 0;
2319 return Some(Chunk {
2320 text,
2321 ..Default::default()
2322 });
2323 }
2324
2325 None
2326 }
2327}
2328
2329impl ToOffset for Point {
2330 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2331 snapshot.point_to_offset(*self)
2332 }
2333}
2334
2335impl ToOffset for PointUtf16 {
2336 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2337 snapshot.point_utf16_to_offset(*self)
2338 }
2339}
2340
2341impl ToOffset for usize {
2342 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2343 assert!(*self <= snapshot.len(), "offset is out of range");
2344 *self
2345 }
2346}
2347
2348impl ToPoint for usize {
2349 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2350 snapshot.offset_to_point(*self)
2351 }
2352}
2353
2354impl ToPoint for Point {
2355 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2356 *self
2357 }
2358}
2359
2360#[cfg(test)]
2361mod tests {
2362 use super::*;
2363 use gpui::MutableAppContext;
2364 use language::{Buffer, Rope};
2365 use rand::prelude::*;
2366 use std::env;
2367 use text::{Point, RandomCharIter};
2368 use util::test::sample_text;
2369
2370 #[gpui::test]
2371 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2372 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2373 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2374
2375 let snapshot = multibuffer.read(cx).snapshot(cx);
2376 assert_eq!(snapshot.text(), buffer.read(cx).text());
2377
2378 assert_eq!(
2379 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2380 (0..buffer.read(cx).row_count())
2381 .map(Some)
2382 .collect::<Vec<_>>()
2383 );
2384
2385 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2386 let snapshot = multibuffer.read(cx).snapshot(cx);
2387
2388 assert_eq!(snapshot.text(), buffer.read(cx).text());
2389 assert_eq!(
2390 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2391 (0..buffer.read(cx).row_count())
2392 .map(Some)
2393 .collect::<Vec<_>>()
2394 );
2395 }
2396
2397 #[gpui::test]
2398 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2399 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2400 let guest_buffer = cx.add_model(|cx| {
2401 let message = host_buffer.read(cx).to_proto();
2402 Buffer::from_proto(1, message, None, cx).unwrap()
2403 });
2404 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2405 let snapshot = multibuffer.read(cx).snapshot(cx);
2406 assert_eq!(snapshot.text(), "a");
2407
2408 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2409 let snapshot = multibuffer.read(cx).snapshot(cx);
2410 assert_eq!(snapshot.text(), "ab");
2411
2412 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2413 let snapshot = multibuffer.read(cx).snapshot(cx);
2414 assert_eq!(snapshot.text(), "abc");
2415 }
2416
2417 #[gpui::test]
2418 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2419 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2420 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2421 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2422
2423 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2424 let subscription = multibuffer.subscribe();
2425 multibuffer.push_excerpt(
2426 ExcerptProperties {
2427 buffer: &buffer_1,
2428 range: Point::new(1, 2)..Point::new(2, 5),
2429 },
2430 cx,
2431 );
2432 assert_eq!(
2433 subscription.consume().into_inner(),
2434 [Edit {
2435 old: 0..0,
2436 new: 0..10
2437 }]
2438 );
2439
2440 multibuffer.push_excerpt(
2441 ExcerptProperties {
2442 buffer: &buffer_1,
2443 range: Point::new(3, 3)..Point::new(4, 4),
2444 },
2445 cx,
2446 );
2447 multibuffer.push_excerpt(
2448 ExcerptProperties {
2449 buffer: &buffer_2,
2450 range: Point::new(3, 1)..Point::new(3, 3),
2451 },
2452 cx,
2453 );
2454 assert_eq!(
2455 subscription.consume().into_inner(),
2456 [Edit {
2457 old: 10..10,
2458 new: 10..22
2459 }]
2460 );
2461
2462 subscription
2463 });
2464
2465 let snapshot = multibuffer.read(cx).snapshot(cx);
2466 assert_eq!(
2467 snapshot.text(),
2468 concat!(
2469 "bbbb\n", // Preserve newlines
2470 "ccccc\n", //
2471 "ddd\n", //
2472 "eeee\n", //
2473 "jj" //
2474 )
2475 );
2476 assert_eq!(
2477 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2478 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2479 );
2480 assert_eq!(
2481 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2482 [Some(3), Some(4), Some(3)]
2483 );
2484 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2485 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2486 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2487 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2488 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2489 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2490 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2491 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2492
2493 buffer_1.update(cx, |buffer, cx| {
2494 buffer.edit(
2495 [
2496 Point::new(0, 0)..Point::new(0, 0),
2497 Point::new(2, 1)..Point::new(2, 3),
2498 ],
2499 "\n",
2500 cx,
2501 );
2502 });
2503
2504 let snapshot = multibuffer.read(cx).snapshot(cx);
2505 assert_eq!(
2506 snapshot.text(),
2507 concat!(
2508 "bbbb\n", // Preserve newlines
2509 "c\n", //
2510 "cc\n", //
2511 "ddd\n", //
2512 "eeee\n", //
2513 "jj" //
2514 )
2515 );
2516
2517 assert_eq!(
2518 subscription.consume().into_inner(),
2519 [Edit {
2520 old: 6..8,
2521 new: 6..7
2522 }]
2523 );
2524
2525 let snapshot = multibuffer.read(cx).snapshot(cx);
2526 assert_eq!(
2527 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2528 Point::new(0, 4)
2529 );
2530 assert_eq!(
2531 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2532 Point::new(0, 4)
2533 );
2534 assert_eq!(
2535 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2536 Point::new(5, 1)
2537 );
2538 assert_eq!(
2539 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2540 Point::new(5, 2)
2541 );
2542 assert_eq!(
2543 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2544 Point::new(5, 2)
2545 );
2546
2547 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2548 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2549 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2550 multibuffer.snapshot(cx)
2551 });
2552
2553 assert_eq!(
2554 snapshot.text(),
2555 concat!(
2556 "bbbb\n", // Preserve newlines
2557 "c\n", //
2558 "cc\n", //
2559 "ddd\n", //
2560 "eeee", //
2561 )
2562 );
2563 }
2564
2565 #[gpui::test]
2566 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2567 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2568
2569 let snapshot = multibuffer.read(cx).snapshot(cx);
2570 assert_eq!(snapshot.text(), "");
2571 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2572 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2573 }
2574
2575 #[gpui::test]
2576 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2577 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2578 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2579 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2580 buffer.update(cx, |buffer, cx| {
2581 buffer.edit([0..0], "X", cx);
2582 buffer.edit([5..5], "Y", cx);
2583 });
2584 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2585
2586 assert_eq!(old_snapshot.text(), "abcd");
2587 assert_eq!(new_snapshot.text(), "XabcdY");
2588
2589 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2590 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2591 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2592 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2593 }
2594
2595 #[gpui::test]
2596 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2597 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2598 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2599 let multibuffer = cx.add_model(|cx| {
2600 let mut multibuffer = MultiBuffer::new(0);
2601 multibuffer.push_excerpt(
2602 ExcerptProperties {
2603 buffer: &buffer_1,
2604 range: 0..4,
2605 },
2606 cx,
2607 );
2608 multibuffer.push_excerpt(
2609 ExcerptProperties {
2610 buffer: &buffer_2,
2611 range: 0..5,
2612 },
2613 cx,
2614 );
2615 multibuffer
2616 });
2617 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2618
2619 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2620 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2621 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2622 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2623 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2624 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2625
2626 buffer_1.update(cx, |buffer, cx| {
2627 buffer.edit([0..0], "W", cx);
2628 buffer.edit([5..5], "X", cx);
2629 });
2630 buffer_2.update(cx, |buffer, cx| {
2631 buffer.edit([0..0], "Y", cx);
2632 buffer.edit([6..0], "Z", cx);
2633 });
2634 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2635
2636 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2637 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2638
2639 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2640 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2641 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2642 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2643 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2644 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2645 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2646 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2647 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2648 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2649 }
2650
2651 #[gpui::test]
2652 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
2653 cx: &mut MutableAppContext,
2654 ) {
2655 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2656 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
2657 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2658
2659 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
2660 // Add an excerpt from buffer 1 that spans this new insertion.
2661 buffer_1.update(cx, |buffer, cx| buffer.edit([4..4], "123", cx));
2662 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
2663 multibuffer.push_excerpt(
2664 ExcerptProperties {
2665 buffer: &buffer_1,
2666 range: 0..7,
2667 },
2668 cx,
2669 )
2670 });
2671
2672 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
2673 assert_eq!(snapshot_1.text(), "abcd123");
2674
2675 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
2676 let (excerpt_id_2, excerpt_id_3, _) = multibuffer.update(cx, |multibuffer, cx| {
2677 multibuffer.remove_excerpts([&excerpt_id_1], cx);
2678 (
2679 multibuffer.push_excerpt(
2680 ExcerptProperties {
2681 buffer: &buffer_2,
2682 range: 0..4,
2683 },
2684 cx,
2685 ),
2686 multibuffer.push_excerpt(
2687 ExcerptProperties {
2688 buffer: &buffer_2,
2689 range: 6..10,
2690 },
2691 cx,
2692 ),
2693 multibuffer.push_excerpt(
2694 ExcerptProperties {
2695 buffer: &buffer_2,
2696 range: 12..16,
2697 },
2698 cx,
2699 ),
2700 )
2701 });
2702 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
2703 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
2704
2705 // The old excerpt id has been reused.
2706 assert_eq!(excerpt_id_2, excerpt_id_1);
2707
2708 // Resolve some anchors from the previous snapshot in the new snapshot.
2709 // Although there is still an excerpt with the same id, it is for
2710 // a different buffer, so we don't attempt to resolve the old text
2711 // anchor in the new buffer.
2712 assert_eq!(
2713 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
2714 0
2715 );
2716 assert_eq!(
2717 snapshot_2.summaries_for_anchors::<usize, _>(&[
2718 snapshot_1.anchor_before(2),
2719 snapshot_1.anchor_after(3)
2720 ]),
2721 vec![0, 0]
2722 );
2723 let refresh =
2724 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
2725 assert_eq!(
2726 refresh,
2727 &[
2728 (0, snapshot_2.anchor_before(0), false),
2729 (1, snapshot_2.anchor_after(0), false),
2730 ]
2731 );
2732
2733 // Replace the middle excerpt with a smaller excerpt in buffer 2,
2734 // that intersects the old excerpt.
2735 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
2736 multibuffer.remove_excerpts([&excerpt_id_3], cx);
2737 multibuffer.insert_excerpt_after(
2738 &excerpt_id_3,
2739 ExcerptProperties {
2740 buffer: &buffer_2,
2741 range: 5..8,
2742 },
2743 cx,
2744 )
2745 });
2746
2747 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
2748 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
2749 assert_ne!(excerpt_id_5, excerpt_id_3);
2750
2751 // Resolve some anchors from the previous snapshot in the new snapshot.
2752 // The anchor in the middle excerpt snaps to the beginning of the
2753 // excerpt, since it is not
2754 let anchors = [
2755 snapshot_2.anchor_before(0),
2756 snapshot_2.anchor_after(2),
2757 snapshot_2.anchor_after(6),
2758 snapshot_2.anchor_after(14),
2759 ];
2760 assert_eq!(
2761 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
2762 &[0, 2, 9, 13]
2763 );
2764
2765 let new_anchors = snapshot_3.refresh_anchors(&anchors);
2766 assert_eq!(
2767 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
2768 &[(0, true), (1, true), (2, true), (3, true)]
2769 );
2770 assert_eq!(
2771 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
2772 &[0, 2, 7, 13]
2773 );
2774 }
2775
2776 #[gpui::test(iterations = 100)]
2777 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
2778 let operations = env::var("OPERATIONS")
2779 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2780 .unwrap_or(10);
2781
2782 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2783 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2784 let mut excerpt_ids = Vec::new();
2785 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2786 let mut anchors = Vec::new();
2787 let mut old_versions = Vec::new();
2788
2789 for _ in 0..operations {
2790 match rng.gen_range(0..100) {
2791 0..=19 if !buffers.is_empty() => {
2792 let buffer = buffers.choose(&mut rng).unwrap();
2793 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
2794 }
2795 20..=29 if !expected_excerpts.is_empty() => {
2796 let mut ids_to_remove = vec![];
2797 for _ in 0..rng.gen_range(1..=3) {
2798 if expected_excerpts.is_empty() {
2799 break;
2800 }
2801
2802 let ix = rng.gen_range(0..expected_excerpts.len());
2803 ids_to_remove.push(excerpt_ids.remove(ix));
2804 let (buffer, range) = expected_excerpts.remove(ix);
2805 let buffer = buffer.read(cx);
2806 log::info!(
2807 "Removing excerpt {}: {:?}",
2808 ix,
2809 buffer
2810 .text_for_range(range.to_offset(&buffer))
2811 .collect::<String>(),
2812 );
2813 }
2814 ids_to_remove.sort_unstable();
2815 multibuffer.update(cx, |multibuffer, cx| {
2816 multibuffer.remove_excerpts(&ids_to_remove, cx)
2817 });
2818 }
2819 30..=39 if !expected_excerpts.is_empty() => {
2820 let multibuffer = multibuffer.read(cx).read(cx);
2821 let offset =
2822 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
2823 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
2824 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
2825 anchors.push(multibuffer.anchor_at(offset, bias));
2826 anchors.sort_by(|a, b| a.cmp(&b, &multibuffer).unwrap());
2827 }
2828 40..=44 if !anchors.is_empty() => {
2829 let multibuffer = multibuffer.read(cx).read(cx);
2830
2831 anchors = multibuffer
2832 .refresh_anchors(&anchors)
2833 .into_iter()
2834 .map(|a| a.1)
2835 .collect();
2836
2837 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
2838 // overshoot its boundaries.
2839 let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
2840 for anchor in &anchors {
2841 if anchor.excerpt_id == ExcerptId::min()
2842 || anchor.excerpt_id == ExcerptId::max()
2843 {
2844 continue;
2845 }
2846
2847 cursor.seek_forward(&Some(&anchor.excerpt_id), Bias::Left, &());
2848 let excerpt = cursor.item().unwrap();
2849 assert_eq!(excerpt.id, anchor.excerpt_id);
2850 assert!(excerpt.contains(anchor));
2851 }
2852 }
2853 _ => {
2854 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
2855 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
2856 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
2857 buffers.last().unwrap()
2858 } else {
2859 buffers.choose(&mut rng).unwrap()
2860 };
2861
2862 let buffer = buffer_handle.read(cx);
2863 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
2864 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
2865 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
2866 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
2867 let prev_excerpt_id = excerpt_ids
2868 .get(prev_excerpt_ix)
2869 .cloned()
2870 .unwrap_or(ExcerptId::max());
2871 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
2872
2873 log::info!(
2874 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
2875 excerpt_ix,
2876 expected_excerpts.len(),
2877 buffer_handle.id(),
2878 buffer.text(),
2879 start_ix..end_ix,
2880 &buffer.text()[start_ix..end_ix]
2881 );
2882
2883 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
2884 multibuffer.insert_excerpt_after(
2885 &prev_excerpt_id,
2886 ExcerptProperties {
2887 buffer: &buffer_handle,
2888 range: start_ix..end_ix,
2889 },
2890 cx,
2891 )
2892 });
2893
2894 excerpt_ids.insert(excerpt_ix, excerpt_id);
2895 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
2896 }
2897 }
2898
2899 if rng.gen_bool(0.3) {
2900 multibuffer.update(cx, |multibuffer, cx| {
2901 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
2902 })
2903 }
2904
2905 let snapshot = multibuffer.read(cx).snapshot(cx);
2906
2907 let mut excerpt_starts = Vec::new();
2908 let mut expected_text = String::new();
2909 let mut expected_buffer_rows = Vec::new();
2910 for (buffer, range) in &expected_excerpts {
2911 let buffer = buffer.read(cx);
2912 let buffer_range = range.to_offset(buffer);
2913
2914 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
2915 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
2916 expected_text.push('\n');
2917
2918 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
2919 ..=buffer.offset_to_point(buffer_range.end).row;
2920 for row in buffer_row_range {
2921 expected_buffer_rows.push(Some(row));
2922 }
2923 }
2924 // Remove final trailing newline.
2925 if !expected_excerpts.is_empty() {
2926 expected_text.pop();
2927 }
2928
2929 // Always report one buffer row
2930 if expected_buffer_rows.is_empty() {
2931 expected_buffer_rows.push(Some(0));
2932 }
2933
2934 assert_eq!(snapshot.text(), expected_text);
2935 log::info!("MultiBuffer text: {:?}", expected_text);
2936
2937 assert_eq!(
2938 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2939 expected_buffer_rows,
2940 );
2941
2942 for _ in 0..5 {
2943 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
2944 assert_eq!(
2945 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
2946 &expected_buffer_rows[start_row..],
2947 "buffer_rows({})",
2948 start_row
2949 );
2950 }
2951
2952 assert_eq!(
2953 snapshot.max_buffer_row(),
2954 expected_buffer_rows
2955 .into_iter()
2956 .filter_map(|r| r)
2957 .max()
2958 .unwrap()
2959 );
2960
2961 let mut excerpt_starts = excerpt_starts.into_iter();
2962 for (buffer, range) in &expected_excerpts {
2963 let buffer_id = buffer.id();
2964 let buffer = buffer.read(cx);
2965 let buffer_range = range.to_offset(buffer);
2966 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
2967 let buffer_start_point_utf16 =
2968 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
2969
2970 let excerpt_start = excerpt_starts.next().unwrap();
2971 let mut offset = excerpt_start.bytes;
2972 let mut buffer_offset = buffer_range.start;
2973 let mut point = excerpt_start.lines;
2974 let mut buffer_point = buffer_start_point;
2975 let mut point_utf16 = excerpt_start.lines_utf16;
2976 let mut buffer_point_utf16 = buffer_start_point_utf16;
2977 for ch in buffer
2978 .snapshot()
2979 .chunks(buffer_range.clone(), None)
2980 .flat_map(|c| c.text.chars())
2981 {
2982 for _ in 0..ch.len_utf8() {
2983 let left_offset = snapshot.clip_offset(offset, Bias::Left);
2984 let right_offset = snapshot.clip_offset(offset, Bias::Right);
2985 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
2986 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
2987 assert_eq!(
2988 left_offset,
2989 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
2990 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
2991 offset,
2992 buffer_id,
2993 buffer_offset,
2994 );
2995 assert_eq!(
2996 right_offset,
2997 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
2998 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
2999 offset,
3000 buffer_id,
3001 buffer_offset,
3002 );
3003
3004 let left_point = snapshot.clip_point(point, Bias::Left);
3005 let right_point = snapshot.clip_point(point, Bias::Right);
3006 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
3007 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
3008 assert_eq!(
3009 left_point,
3010 excerpt_start.lines + (buffer_left_point - buffer_start_point),
3011 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
3012 point,
3013 buffer_id,
3014 buffer_point,
3015 );
3016 assert_eq!(
3017 right_point,
3018 excerpt_start.lines + (buffer_right_point - buffer_start_point),
3019 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
3020 point,
3021 buffer_id,
3022 buffer_point,
3023 );
3024
3025 assert_eq!(
3026 snapshot.point_to_offset(left_point),
3027 left_offset,
3028 "point_to_offset({:?})",
3029 left_point,
3030 );
3031 assert_eq!(
3032 snapshot.offset_to_point(left_offset),
3033 left_point,
3034 "offset_to_point({:?})",
3035 left_offset,
3036 );
3037
3038 offset += 1;
3039 buffer_offset += 1;
3040 if ch == '\n' {
3041 point += Point::new(1, 0);
3042 buffer_point += Point::new(1, 0);
3043 } else {
3044 point += Point::new(0, 1);
3045 buffer_point += Point::new(0, 1);
3046 }
3047 }
3048
3049 for _ in 0..ch.len_utf16() {
3050 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
3051 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
3052 let buffer_left_point_utf16 =
3053 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
3054 let buffer_right_point_utf16 =
3055 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
3056 assert_eq!(
3057 left_point_utf16,
3058 excerpt_start.lines_utf16
3059 + (buffer_left_point_utf16 - buffer_start_point_utf16),
3060 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
3061 point_utf16,
3062 buffer_id,
3063 buffer_point_utf16,
3064 );
3065 assert_eq!(
3066 right_point_utf16,
3067 excerpt_start.lines_utf16
3068 + (buffer_right_point_utf16 - buffer_start_point_utf16),
3069 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
3070 point_utf16,
3071 buffer_id,
3072 buffer_point_utf16,
3073 );
3074
3075 if ch == '\n' {
3076 point_utf16 += PointUtf16::new(1, 0);
3077 buffer_point_utf16 += PointUtf16::new(1, 0);
3078 } else {
3079 point_utf16 += PointUtf16::new(0, 1);
3080 buffer_point_utf16 += PointUtf16::new(0, 1);
3081 }
3082 }
3083 }
3084 }
3085
3086 for (row, line) in expected_text.split('\n').enumerate() {
3087 assert_eq!(
3088 snapshot.line_len(row as u32),
3089 line.len() as u32,
3090 "line_len({}).",
3091 row
3092 );
3093 }
3094
3095 let text_rope = Rope::from(expected_text.as_str());
3096 for _ in 0..10 {
3097 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3098 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3099
3100 let text_for_range = snapshot
3101 .text_for_range(start_ix..end_ix)
3102 .collect::<String>();
3103 assert_eq!(
3104 text_for_range,
3105 &expected_text[start_ix..end_ix],
3106 "incorrect text for range {:?}",
3107 start_ix..end_ix
3108 );
3109
3110 let excerpted_buffer_ranges =
3111 multibuffer.read(cx).excerpted_buffers(start_ix..end_ix, cx);
3112 let excerpted_buffers_text = excerpted_buffer_ranges
3113 .into_iter()
3114 .map(|(buffer, buffer_range)| {
3115 buffer
3116 .read(cx)
3117 .text_for_range(buffer_range)
3118 .collect::<String>()
3119 })
3120 .collect::<Vec<_>>()
3121 .join("\n");
3122 assert_eq!(excerpted_buffers_text, text_for_range);
3123
3124 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
3125 assert_eq!(
3126 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
3127 expected_summary,
3128 "incorrect summary for range {:?}",
3129 start_ix..end_ix
3130 );
3131 }
3132
3133 // Anchor resolution
3134 for (anchor, resolved_offset) in anchors
3135 .iter()
3136 .zip(snapshot.summaries_for_anchors::<usize, _>(&anchors))
3137 {
3138 assert!(resolved_offset <= snapshot.len());
3139 assert_eq!(
3140 snapshot.summary_for_anchor::<usize>(anchor),
3141 resolved_offset
3142 );
3143 }
3144
3145 for _ in 0..10 {
3146 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3147 assert_eq!(
3148 snapshot.reversed_chars_at(end_ix).collect::<String>(),
3149 expected_text[..end_ix].chars().rev().collect::<String>(),
3150 );
3151 }
3152
3153 for _ in 0..10 {
3154 let end_ix = rng.gen_range(0..=text_rope.len());
3155 let start_ix = rng.gen_range(0..=end_ix);
3156 assert_eq!(
3157 snapshot
3158 .bytes_in_range(start_ix..end_ix)
3159 .flatten()
3160 .copied()
3161 .collect::<Vec<_>>(),
3162 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
3163 "bytes_in_range({:?})",
3164 start_ix..end_ix,
3165 );
3166 }
3167 }
3168
3169 let snapshot = multibuffer.read(cx).snapshot(cx);
3170 for (old_snapshot, subscription) in old_versions {
3171 let edits = subscription.consume().into_inner();
3172
3173 log::info!(
3174 "applying subscription edits to old text: {:?}: {:?}",
3175 old_snapshot.text(),
3176 edits,
3177 );
3178
3179 let mut text = old_snapshot.text();
3180 for edit in edits {
3181 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
3182 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
3183 }
3184 assert_eq!(text.to_string(), snapshot.text());
3185 }
3186 }
3187
3188 #[gpui::test]
3189 fn test_history(cx: &mut MutableAppContext) {
3190 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
3191 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
3192 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3193 let group_interval = multibuffer.read(cx).history.group_interval;
3194 multibuffer.update(cx, |multibuffer, cx| {
3195 multibuffer.push_excerpt(
3196 ExcerptProperties {
3197 buffer: &buffer_1,
3198 range: 0..buffer_1.read(cx).len(),
3199 },
3200 cx,
3201 );
3202 multibuffer.push_excerpt(
3203 ExcerptProperties {
3204 buffer: &buffer_2,
3205 range: 0..buffer_2.read(cx).len(),
3206 },
3207 cx,
3208 );
3209 });
3210
3211 let mut now = Instant::now();
3212
3213 multibuffer.update(cx, |multibuffer, cx| {
3214 multibuffer.start_transaction_at(now, cx);
3215 multibuffer.edit(
3216 [
3217 Point::new(0, 0)..Point::new(0, 0),
3218 Point::new(1, 0)..Point::new(1, 0),
3219 ],
3220 "A",
3221 cx,
3222 );
3223 multibuffer.edit(
3224 [
3225 Point::new(0, 1)..Point::new(0, 1),
3226 Point::new(1, 1)..Point::new(1, 1),
3227 ],
3228 "B",
3229 cx,
3230 );
3231 multibuffer.end_transaction_at(now, cx);
3232 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3233
3234 now += 2 * group_interval;
3235 multibuffer.start_transaction_at(now, cx);
3236 multibuffer.edit([2..2], "C", cx);
3237 multibuffer.end_transaction_at(now, cx);
3238 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3239
3240 multibuffer.undo(cx);
3241 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3242
3243 multibuffer.undo(cx);
3244 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3245
3246 multibuffer.redo(cx);
3247 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3248
3249 multibuffer.redo(cx);
3250 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3251
3252 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
3253 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3254
3255 multibuffer.undo(cx);
3256 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3257
3258 multibuffer.redo(cx);
3259 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3260
3261 multibuffer.redo(cx);
3262 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3263
3264 multibuffer.undo(cx);
3265 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3266
3267 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
3268 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3269
3270 multibuffer.undo(cx);
3271 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
3272 });
3273 }
3274}