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<Anchor>>>>
856 where
857 T: ToOffset,
858 {
859 let snapshot = self.snapshot(cx);
860 let anchor = snapshot.anchor_before(position);
861 let buffer = self.buffers.borrow()[&anchor.buffer_id].buffer.clone();
862 let completions =
863 buffer.update(cx, |buffer, cx| buffer.completions(anchor.text_anchor, cx));
864 cx.foreground().spawn(async move {
865 completions.await.map(|completions| {
866 completions
867 .into_iter()
868 .map(|completion| Completion {
869 old_range: snapshot.anchor_in_excerpt(
870 anchor.excerpt_id.clone(),
871 completion.old_range.start,
872 )
873 ..snapshot.anchor_in_excerpt(
874 anchor.excerpt_id.clone(),
875 completion.old_range.end,
876 ),
877 new_text: completion.new_text,
878 lsp_completion: completion.lsp_completion,
879 })
880 .collect()
881 })
882 })
883 }
884
885 pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
886 self.buffers
887 .borrow()
888 .values()
889 .next()
890 .and_then(|state| state.buffer.read(cx).language())
891 }
892
893 pub fn file<'a>(&self, cx: &'a AppContext) -> Option<&'a dyn File> {
894 self.as_singleton()?.read(cx).file()
895 }
896
897 #[cfg(test)]
898 pub fn is_parsing(&self, cx: &AppContext) -> bool {
899 self.as_singleton().unwrap().read(cx).is_parsing()
900 }
901
902 fn sync(&self, cx: &AppContext) {
903 let mut snapshot = self.snapshot.borrow_mut();
904 let mut excerpts_to_edit = Vec::new();
905 let mut reparsed = false;
906 let mut diagnostics_updated = false;
907 let mut is_dirty = false;
908 let mut has_conflict = false;
909 let mut buffers = self.buffers.borrow_mut();
910 for buffer_state in buffers.values_mut() {
911 let buffer = buffer_state.buffer.read(cx);
912 let version = buffer.version();
913 let parse_count = buffer.parse_count();
914 let selections_update_count = buffer.selections_update_count();
915 let diagnostics_update_count = buffer.diagnostics_update_count();
916
917 let buffer_edited = version.changed_since(&buffer_state.last_version);
918 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
919 let buffer_selections_updated =
920 selections_update_count > buffer_state.last_selections_update_count;
921 let buffer_diagnostics_updated =
922 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
923 if buffer_edited
924 || buffer_reparsed
925 || buffer_selections_updated
926 || buffer_diagnostics_updated
927 {
928 buffer_state.last_version = version;
929 buffer_state.last_parse_count = parse_count;
930 buffer_state.last_selections_update_count = selections_update_count;
931 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
932 excerpts_to_edit.extend(
933 buffer_state
934 .excerpts
935 .iter()
936 .map(|excerpt_id| (excerpt_id, buffer_state.buffer.clone(), buffer_edited)),
937 );
938 }
939
940 reparsed |= buffer_reparsed;
941 diagnostics_updated |= buffer_diagnostics_updated;
942 is_dirty |= buffer.is_dirty();
943 has_conflict |= buffer.has_conflict();
944 }
945 if reparsed {
946 snapshot.parse_count += 1;
947 }
948 if diagnostics_updated {
949 snapshot.diagnostics_update_count += 1;
950 }
951 snapshot.is_dirty = is_dirty;
952 snapshot.has_conflict = has_conflict;
953
954 excerpts_to_edit.sort_unstable_by_key(|(excerpt_id, _, _)| *excerpt_id);
955
956 let mut edits = Vec::new();
957 let mut new_excerpts = SumTree::new();
958 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
959
960 for (id, buffer, buffer_edited) in excerpts_to_edit {
961 new_excerpts.push_tree(cursor.slice(&Some(id), Bias::Left, &()), &());
962 let old_excerpt = cursor.item().unwrap();
963 let buffer_id = buffer.id();
964 let buffer = buffer.read(cx);
965
966 let mut new_excerpt;
967 if buffer_edited {
968 edits.extend(
969 buffer
970 .edits_since_in_range::<usize>(
971 old_excerpt.buffer.version(),
972 old_excerpt.range.clone(),
973 )
974 .map(|mut edit| {
975 let excerpt_old_start = cursor.start().1;
976 let excerpt_new_start = new_excerpts.summary().text.bytes;
977 edit.old.start += excerpt_old_start;
978 edit.old.end += excerpt_old_start;
979 edit.new.start += excerpt_new_start;
980 edit.new.end += excerpt_new_start;
981 edit
982 }),
983 );
984
985 new_excerpt = Excerpt::new(
986 id.clone(),
987 buffer_id,
988 buffer.snapshot(),
989 old_excerpt.range.clone(),
990 old_excerpt.has_trailing_newline,
991 );
992 } else {
993 new_excerpt = old_excerpt.clone();
994 new_excerpt.buffer = buffer.snapshot();
995 }
996
997 new_excerpts.push(new_excerpt, &());
998 cursor.next(&());
999 }
1000 new_excerpts.push_tree(cursor.suffix(&()), &());
1001
1002 drop(cursor);
1003 snapshot.excerpts = new_excerpts;
1004
1005 self.subscriptions.publish(edits);
1006 }
1007}
1008
1009#[cfg(any(test, feature = "test-support"))]
1010impl MultiBuffer {
1011 pub fn randomly_edit(
1012 &mut self,
1013 rng: &mut impl rand::Rng,
1014 count: usize,
1015 cx: &mut ModelContext<Self>,
1016 ) {
1017 use text::RandomCharIter;
1018
1019 let snapshot = self.read(cx);
1020 let mut old_ranges: Vec<Range<usize>> = Vec::new();
1021 for _ in 0..count {
1022 let last_end = old_ranges.last().map_or(0, |last_range| last_range.end + 1);
1023 if last_end > snapshot.len() {
1024 break;
1025 }
1026 let end_ix = snapshot.clip_offset(rng.gen_range(0..=last_end), Bias::Right);
1027 let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1028 old_ranges.push(start_ix..end_ix);
1029 }
1030 let new_text_len = rng.gen_range(0..10);
1031 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1032 log::info!("mutating multi-buffer at {:?}: {:?}", old_ranges, new_text);
1033 drop(snapshot);
1034
1035 self.edit(old_ranges.iter().cloned(), new_text.as_str(), cx);
1036 }
1037}
1038
1039impl Entity for MultiBuffer {
1040 type Event = language::Event;
1041}
1042
1043impl MultiBufferSnapshot {
1044 pub fn text(&self) -> String {
1045 self.chunks(0..self.len(), None)
1046 .map(|chunk| chunk.text)
1047 .collect()
1048 }
1049
1050 pub fn reversed_chars_at<'a, T: ToOffset>(
1051 &'a self,
1052 position: T,
1053 ) -> impl Iterator<Item = char> + 'a {
1054 let mut offset = position.to_offset(self);
1055 let mut cursor = self.excerpts.cursor::<usize>();
1056 cursor.seek(&offset, Bias::Left, &());
1057 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1058 let end_before_footer = cursor.start() + excerpt.text_summary.bytes;
1059 let start = excerpt.range.start.to_offset(&excerpt.buffer);
1060 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1061 excerpt.buffer.reversed_chunks_in_range(start..end)
1062 });
1063 iter::from_fn(move || {
1064 if offset == *cursor.start() {
1065 cursor.prev(&());
1066 let excerpt = cursor.item()?;
1067 excerpt_chunks = Some(
1068 excerpt
1069 .buffer
1070 .reversed_chunks_in_range(excerpt.range.clone()),
1071 );
1072 }
1073
1074 let excerpt = cursor.item().unwrap();
1075 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1076 offset -= 1;
1077 Some("\n")
1078 } else {
1079 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1080 offset -= chunk.len();
1081 Some(chunk)
1082 }
1083 })
1084 .flat_map(|c| c.chars().rev())
1085 }
1086
1087 pub fn chars_at<'a, T: ToOffset>(&'a self, position: T) -> impl Iterator<Item = char> + 'a {
1088 let offset = position.to_offset(self);
1089 self.text_for_range(offset..self.len())
1090 .flat_map(|chunk| chunk.chars())
1091 }
1092
1093 pub fn text_for_range<'a, T: ToOffset>(
1094 &'a self,
1095 range: Range<T>,
1096 ) -> impl Iterator<Item = &'a str> {
1097 self.chunks(range, None).map(|chunk| chunk.text)
1098 }
1099
1100 pub fn is_line_blank(&self, row: u32) -> bool {
1101 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1102 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1103 }
1104
1105 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1106 where
1107 T: ToOffset,
1108 {
1109 let position = position.to_offset(self);
1110 position == self.clip_offset(position, Bias::Left)
1111 && self
1112 .bytes_in_range(position..self.len())
1113 .flatten()
1114 .copied()
1115 .take(needle.len())
1116 .eq(needle.bytes())
1117 }
1118
1119 fn as_singleton(&self) -> Option<&Excerpt> {
1120 if self.singleton {
1121 self.excerpts.iter().next()
1122 } else {
1123 None
1124 }
1125 }
1126
1127 pub fn len(&self) -> usize {
1128 self.excerpts.summary().text.bytes
1129 }
1130
1131 pub fn max_buffer_row(&self) -> u32 {
1132 self.excerpts.summary().max_buffer_row
1133 }
1134
1135 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1136 if let Some(excerpt) = self.as_singleton() {
1137 return excerpt.buffer.clip_offset(offset, bias);
1138 }
1139
1140 let mut cursor = self.excerpts.cursor::<usize>();
1141 cursor.seek(&offset, Bias::Right, &());
1142 let overshoot = if let Some(excerpt) = cursor.item() {
1143 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1144 let buffer_offset = excerpt
1145 .buffer
1146 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1147 buffer_offset.saturating_sub(excerpt_start)
1148 } else {
1149 0
1150 };
1151 cursor.start() + overshoot
1152 }
1153
1154 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1155 if let Some(excerpt) = self.as_singleton() {
1156 return excerpt.buffer.clip_point(point, bias);
1157 }
1158
1159 let mut cursor = self.excerpts.cursor::<Point>();
1160 cursor.seek(&point, Bias::Right, &());
1161 let overshoot = if let Some(excerpt) = cursor.item() {
1162 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1163 let buffer_point = excerpt
1164 .buffer
1165 .clip_point(excerpt_start + (point - cursor.start()), bias);
1166 buffer_point.saturating_sub(excerpt_start)
1167 } else {
1168 Point::zero()
1169 };
1170 *cursor.start() + overshoot
1171 }
1172
1173 pub fn clip_point_utf16(&self, point: PointUtf16, bias: Bias) -> PointUtf16 {
1174 if let Some(excerpt) = self.as_singleton() {
1175 return excerpt.buffer.clip_point_utf16(point, bias);
1176 }
1177
1178 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1179 cursor.seek(&point, Bias::Right, &());
1180 let overshoot = if let Some(excerpt) = cursor.item() {
1181 let excerpt_start = excerpt
1182 .buffer
1183 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1184 let buffer_point = excerpt
1185 .buffer
1186 .clip_point_utf16(excerpt_start + (point - cursor.start()), bias);
1187 buffer_point.saturating_sub(excerpt_start)
1188 } else {
1189 PointUtf16::zero()
1190 };
1191 *cursor.start() + overshoot
1192 }
1193
1194 pub fn bytes_in_range<'a, T: ToOffset>(&'a self, range: Range<T>) -> MultiBufferBytes<'a> {
1195 let range = range.start.to_offset(self)..range.end.to_offset(self);
1196 let mut excerpts = self.excerpts.cursor::<usize>();
1197 excerpts.seek(&range.start, Bias::Right, &());
1198
1199 let mut chunk = &[][..];
1200 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1201 let mut excerpt_bytes = excerpt
1202 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1203 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1204 Some(excerpt_bytes)
1205 } else {
1206 None
1207 };
1208
1209 MultiBufferBytes {
1210 range,
1211 excerpts,
1212 excerpt_bytes,
1213 chunk,
1214 }
1215 }
1216
1217 pub fn buffer_rows<'a>(&'a self, start_row: u32) -> MultiBufferRows<'a> {
1218 let mut result = MultiBufferRows {
1219 buffer_row_range: 0..0,
1220 excerpts: self.excerpts.cursor(),
1221 };
1222 result.seek(start_row);
1223 result
1224 }
1225
1226 pub fn chunks<'a, T: ToOffset>(
1227 &'a self,
1228 range: Range<T>,
1229 theme: Option<&'a SyntaxTheme>,
1230 ) -> MultiBufferChunks<'a> {
1231 let range = range.start.to_offset(self)..range.end.to_offset(self);
1232 let mut chunks = MultiBufferChunks {
1233 range: range.clone(),
1234 excerpts: self.excerpts.cursor(),
1235 excerpt_chunks: None,
1236 theme,
1237 };
1238 chunks.seek(range.start);
1239 chunks
1240 }
1241
1242 pub fn offset_to_point(&self, offset: usize) -> Point {
1243 if let Some(excerpt) = self.as_singleton() {
1244 return excerpt.buffer.offset_to_point(offset);
1245 }
1246
1247 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1248 cursor.seek(&offset, Bias::Right, &());
1249 if let Some(excerpt) = cursor.item() {
1250 let (start_offset, start_point) = cursor.start();
1251 let overshoot = offset - start_offset;
1252 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1253 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1254 let buffer_point = excerpt
1255 .buffer
1256 .offset_to_point(excerpt_start_offset + overshoot);
1257 *start_point + (buffer_point - excerpt_start_point)
1258 } else {
1259 self.excerpts.summary().text.lines
1260 }
1261 }
1262
1263 pub fn point_to_offset(&self, point: Point) -> usize {
1264 if let Some(excerpt) = self.as_singleton() {
1265 return excerpt.buffer.point_to_offset(point);
1266 }
1267
1268 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1269 cursor.seek(&point, Bias::Right, &());
1270 if let Some(excerpt) = cursor.item() {
1271 let (start_point, start_offset) = cursor.start();
1272 let overshoot = point - start_point;
1273 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1274 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1275 let buffer_offset = excerpt
1276 .buffer
1277 .point_to_offset(excerpt_start_point + overshoot);
1278 *start_offset + buffer_offset - excerpt_start_offset
1279 } else {
1280 self.excerpts.summary().text.bytes
1281 }
1282 }
1283
1284 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1285 if let Some(excerpt) = self.as_singleton() {
1286 return excerpt.buffer.point_utf16_to_offset(point);
1287 }
1288
1289 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1290 cursor.seek(&point, Bias::Right, &());
1291 if let Some(excerpt) = cursor.item() {
1292 let (start_point, start_offset) = cursor.start();
1293 let overshoot = point - start_point;
1294 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1295 let excerpt_start_point = excerpt
1296 .buffer
1297 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1298 let buffer_offset = excerpt
1299 .buffer
1300 .point_utf16_to_offset(excerpt_start_point + overshoot);
1301 *start_offset + (buffer_offset - excerpt_start_offset)
1302 } else {
1303 self.excerpts.summary().text.bytes
1304 }
1305 }
1306
1307 pub fn indent_column_for_line(&self, row: u32) -> u32 {
1308 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
1309 buffer
1310 .indent_column_for_line(range.start.row)
1311 .min(range.end.column)
1312 .saturating_sub(range.start.column)
1313 } else {
1314 0
1315 }
1316 }
1317
1318 pub fn line_len(&self, row: u32) -> u32 {
1319 if let Some((_, range)) = self.buffer_line_for_row(row) {
1320 range.end.column - range.start.column
1321 } else {
1322 0
1323 }
1324 }
1325
1326 fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
1327 let mut cursor = self.excerpts.cursor::<Point>();
1328 cursor.seek(&Point::new(row, 0), Bias::Right, &());
1329 if let Some(excerpt) = cursor.item() {
1330 let overshoot = row - cursor.start().row;
1331 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1332 let excerpt_end = excerpt.range.end.to_point(&excerpt.buffer);
1333 let buffer_row = excerpt_start.row + overshoot;
1334 let line_start = Point::new(buffer_row, 0);
1335 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
1336 return Some((
1337 &excerpt.buffer,
1338 line_start.max(excerpt_start)..line_end.min(excerpt_end),
1339 ));
1340 }
1341 None
1342 }
1343
1344 pub fn max_point(&self) -> Point {
1345 self.text_summary().lines
1346 }
1347
1348 pub fn text_summary(&self) -> TextSummary {
1349 self.excerpts.summary().text
1350 }
1351
1352 pub fn text_summary_for_range<'a, D, O>(&'a self, range: Range<O>) -> D
1353 where
1354 D: TextDimension,
1355 O: ToOffset,
1356 {
1357 let mut summary = D::default();
1358 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1359 let mut cursor = self.excerpts.cursor::<usize>();
1360 cursor.seek(&range.start, Bias::Right, &());
1361 if let Some(excerpt) = cursor.item() {
1362 let mut end_before_newline = cursor.end(&());
1363 if excerpt.has_trailing_newline {
1364 end_before_newline -= 1;
1365 }
1366
1367 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1368 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
1369 let end_in_excerpt =
1370 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
1371 summary.add_assign(
1372 &excerpt
1373 .buffer
1374 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
1375 );
1376
1377 if range.end > end_before_newline {
1378 summary.add_assign(&D::from_text_summary(&TextSummary {
1379 bytes: 1,
1380 lines: Point::new(1 as u32, 0),
1381 lines_utf16: PointUtf16::new(1 as u32, 0),
1382 first_line_chars: 0,
1383 last_line_chars: 0,
1384 longest_row: 0,
1385 longest_row_chars: 0,
1386 }));
1387 }
1388
1389 cursor.next(&());
1390 }
1391
1392 if range.end > *cursor.start() {
1393 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
1394 &range.end,
1395 Bias::Right,
1396 &(),
1397 )));
1398 if let Some(excerpt) = cursor.item() {
1399 range.end = cmp::max(*cursor.start(), range.end);
1400
1401 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1402 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
1403 summary.add_assign(
1404 &excerpt
1405 .buffer
1406 .text_summary_for_range(excerpt_start..end_in_excerpt),
1407 );
1408 }
1409 }
1410
1411 summary
1412 }
1413
1414 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
1415 where
1416 D: TextDimension + Ord + Sub<D, Output = D>,
1417 {
1418 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1419 cursor.seek(&Some(&anchor.excerpt_id), Bias::Left, &());
1420 if cursor.item().is_none() {
1421 cursor.next(&());
1422 }
1423
1424 let mut position = D::from_text_summary(&cursor.start().text);
1425 if let Some(excerpt) = cursor.item() {
1426 if excerpt.id == anchor.excerpt_id && excerpt.buffer_id == anchor.buffer_id {
1427 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1428 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1429 let buffer_position = cmp::min(
1430 excerpt_buffer_end,
1431 anchor.text_anchor.summary::<D>(&excerpt.buffer),
1432 );
1433 if buffer_position > excerpt_buffer_start {
1434 position.add_assign(&(buffer_position - excerpt_buffer_start));
1435 }
1436 }
1437 }
1438 position
1439 }
1440
1441 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
1442 where
1443 D: TextDimension + Ord + Sub<D, Output = D>,
1444 I: 'a + IntoIterator<Item = &'a Anchor>,
1445 {
1446 let mut anchors = anchors.into_iter().peekable();
1447 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1448 let mut summaries = Vec::new();
1449 while let Some(anchor) = anchors.peek() {
1450 let excerpt_id = &anchor.excerpt_id;
1451 let buffer_id = anchor.buffer_id;
1452 let excerpt_anchors = iter::from_fn(|| {
1453 let anchor = anchors.peek()?;
1454 if anchor.excerpt_id == *excerpt_id && anchor.buffer_id == buffer_id {
1455 Some(&anchors.next().unwrap().text_anchor)
1456 } else {
1457 None
1458 }
1459 });
1460
1461 cursor.seek_forward(&Some(excerpt_id), Bias::Left, &());
1462 if cursor.item().is_none() {
1463 cursor.next(&());
1464 }
1465
1466 let position = D::from_text_summary(&cursor.start().text);
1467 if let Some(excerpt) = cursor.item() {
1468 if excerpt.id == *excerpt_id && excerpt.buffer_id == buffer_id {
1469 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1470 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1471 summaries.extend(
1472 excerpt
1473 .buffer
1474 .summaries_for_anchors::<D, _>(excerpt_anchors)
1475 .map(move |summary| {
1476 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
1477 let mut position = position.clone();
1478 let excerpt_buffer_start = excerpt_buffer_start.clone();
1479 if summary > excerpt_buffer_start {
1480 position.add_assign(&(summary - excerpt_buffer_start));
1481 }
1482 position
1483 }),
1484 );
1485 continue;
1486 }
1487 }
1488
1489 summaries.extend(excerpt_anchors.map(|_| position.clone()));
1490 }
1491
1492 summaries
1493 }
1494
1495 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
1496 where
1497 I: 'a + IntoIterator<Item = &'a Anchor>,
1498 {
1499 let mut anchors = anchors.into_iter().enumerate().peekable();
1500 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1501 let mut result = Vec::new();
1502 while let Some((_, anchor)) = anchors.peek() {
1503 let old_excerpt_id = &anchor.excerpt_id;
1504
1505 // Find the location where this anchor's excerpt should be.
1506 cursor.seek_forward(&Some(old_excerpt_id), Bias::Left, &());
1507 if cursor.item().is_none() {
1508 cursor.next(&());
1509 }
1510
1511 let next_excerpt = cursor.item();
1512 let prev_excerpt = cursor.prev_item();
1513
1514 // Process all of the anchors for this excerpt.
1515 while let Some((_, anchor)) = anchors.peek() {
1516 if anchor.excerpt_id != *old_excerpt_id {
1517 break;
1518 }
1519 let mut kept_position = false;
1520 let (anchor_ix, anchor) = anchors.next().unwrap();
1521 let mut anchor = anchor.clone();
1522
1523 // Leave min and max anchors unchanged.
1524 if *old_excerpt_id == ExcerptId::max() || *old_excerpt_id == ExcerptId::min() {
1525 kept_position = true;
1526 }
1527 // If the old excerpt still exists at this location, then leave
1528 // the anchor unchanged.
1529 else if next_excerpt.map_or(false, |excerpt| {
1530 excerpt.id == *old_excerpt_id && excerpt.contains(&anchor)
1531 }) {
1532 kept_position = true;
1533 }
1534 // If the old excerpt no longer exists at this location, then attempt to
1535 // find an equivalent position for this anchor in an adjacent excerpt.
1536 else {
1537 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
1538 if excerpt.contains(&anchor) {
1539 anchor.excerpt_id = excerpt.id.clone();
1540 kept_position = true;
1541 break;
1542 }
1543 }
1544 }
1545 // If there's no adjacent excerpt that contains the anchor's position,
1546 // then report that the anchor has lost its position.
1547 if !kept_position {
1548 anchor = if let Some(excerpt) = next_excerpt {
1549 let mut text_anchor = excerpt
1550 .range
1551 .start
1552 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1553 if text_anchor
1554 .cmp(&excerpt.range.end, &excerpt.buffer)
1555 .unwrap()
1556 .is_gt()
1557 {
1558 text_anchor = excerpt.range.end.clone();
1559 }
1560 Anchor {
1561 buffer_id: excerpt.buffer_id,
1562 excerpt_id: excerpt.id.clone(),
1563 text_anchor,
1564 }
1565 } else if let Some(excerpt) = prev_excerpt {
1566 let mut text_anchor = excerpt
1567 .range
1568 .end
1569 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1570 if text_anchor
1571 .cmp(&excerpt.range.start, &excerpt.buffer)
1572 .unwrap()
1573 .is_lt()
1574 {
1575 text_anchor = excerpt.range.start.clone();
1576 }
1577 Anchor {
1578 buffer_id: excerpt.buffer_id,
1579 excerpt_id: excerpt.id.clone(),
1580 text_anchor,
1581 }
1582 } else if anchor.text_anchor.bias == Bias::Left {
1583 Anchor::min()
1584 } else {
1585 Anchor::max()
1586 };
1587 }
1588
1589 result.push((anchor_ix, anchor, kept_position));
1590 }
1591 }
1592 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self).unwrap());
1593 result
1594 }
1595
1596 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
1597 self.anchor_at(position, Bias::Left)
1598 }
1599
1600 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
1601 self.anchor_at(position, Bias::Right)
1602 }
1603
1604 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
1605 let offset = position.to_offset(self);
1606 if let Some(excerpt) = self.as_singleton() {
1607 return Anchor {
1608 buffer_id: excerpt.buffer_id,
1609 excerpt_id: excerpt.id.clone(),
1610 text_anchor: excerpt.buffer.anchor_at(offset, bias),
1611 };
1612 }
1613
1614 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1615 cursor.seek(&offset, Bias::Right, &());
1616 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
1617 cursor.prev(&());
1618 }
1619 if let Some(excerpt) = cursor.item() {
1620 let mut overshoot = offset.saturating_sub(cursor.start().0);
1621 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
1622 overshoot -= 1;
1623 bias = Bias::Right;
1624 }
1625
1626 let buffer_start = excerpt.range.start.to_offset(&excerpt.buffer);
1627 let text_anchor =
1628 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
1629 Anchor {
1630 buffer_id: excerpt.buffer_id,
1631 excerpt_id: excerpt.id.clone(),
1632 text_anchor,
1633 }
1634 } else if offset == 0 && bias == Bias::Left {
1635 Anchor::min()
1636 } else {
1637 Anchor::max()
1638 }
1639 }
1640
1641 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
1642 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1643 cursor.seek(&Some(&excerpt_id), Bias::Left, &());
1644 if let Some(excerpt) = cursor.item() {
1645 if excerpt.id == excerpt_id {
1646 let text_anchor = excerpt.clip_anchor(text_anchor);
1647 drop(cursor);
1648 return Anchor {
1649 buffer_id: excerpt.buffer_id,
1650 excerpt_id,
1651 text_anchor,
1652 };
1653 }
1654 }
1655 panic!("excerpt not found");
1656 }
1657
1658 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
1659 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
1660 true
1661 } else if let Some((buffer_id, buffer_snapshot)) =
1662 self.buffer_snapshot_for_excerpt(&anchor.excerpt_id)
1663 {
1664 anchor.buffer_id == buffer_id && buffer_snapshot.can_resolve(&anchor.text_anchor)
1665 } else {
1666 false
1667 }
1668 }
1669
1670 pub fn range_contains_excerpt_boundary<T: ToOffset>(&self, range: Range<T>) -> bool {
1671 let start = range.start.to_offset(self);
1672 let end = range.end.to_offset(self);
1673 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1674 cursor.seek(&start, Bias::Right, &());
1675 let start_id = cursor
1676 .item()
1677 .or_else(|| cursor.prev_item())
1678 .map(|excerpt| &excerpt.id);
1679 cursor.seek_forward(&end, Bias::Right, &());
1680 let end_id = cursor
1681 .item()
1682 .or_else(|| cursor.prev_item())
1683 .map(|excerpt| &excerpt.id);
1684 start_id != end_id
1685 }
1686
1687 pub fn parse_count(&self) -> usize {
1688 self.parse_count
1689 }
1690
1691 pub fn enclosing_bracket_ranges<T: ToOffset>(
1692 &self,
1693 range: Range<T>,
1694 ) -> Option<(Range<usize>, Range<usize>)> {
1695 let range = range.start.to_offset(self)..range.end.to_offset(self);
1696
1697 let mut cursor = self.excerpts.cursor::<usize>();
1698 cursor.seek(&range.start, Bias::Right, &());
1699 let start_excerpt = cursor.item();
1700
1701 cursor.seek(&range.end, Bias::Right, &());
1702 let end_excerpt = cursor.item();
1703
1704 start_excerpt
1705 .zip(end_excerpt)
1706 .and_then(|(start_excerpt, end_excerpt)| {
1707 if start_excerpt.id != end_excerpt.id {
1708 return None;
1709 }
1710
1711 let excerpt_buffer_start =
1712 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1713 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1714
1715 let start_in_buffer =
1716 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1717 let end_in_buffer =
1718 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1719 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
1720 .buffer
1721 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
1722
1723 if start_bracket_range.start >= excerpt_buffer_start
1724 && end_bracket_range.end < excerpt_buffer_end
1725 {
1726 start_bracket_range.start =
1727 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
1728 start_bracket_range.end =
1729 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
1730 end_bracket_range.start =
1731 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
1732 end_bracket_range.end =
1733 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
1734 Some((start_bracket_range, end_bracket_range))
1735 } else {
1736 None
1737 }
1738 })
1739 }
1740
1741 pub fn diagnostics_update_count(&self) -> usize {
1742 self.diagnostics_update_count
1743 }
1744
1745 pub fn language(&self) -> Option<&Arc<Language>> {
1746 self.excerpts
1747 .iter()
1748 .next()
1749 .and_then(|excerpt| excerpt.buffer.language())
1750 }
1751
1752 pub fn is_dirty(&self) -> bool {
1753 self.is_dirty
1754 }
1755
1756 pub fn has_conflict(&self) -> bool {
1757 self.has_conflict
1758 }
1759
1760 pub fn diagnostic_group<'a, O>(
1761 &'a self,
1762 group_id: usize,
1763 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1764 where
1765 O: text::FromAnchor + 'a,
1766 {
1767 self.as_singleton()
1768 .into_iter()
1769 .flat_map(move |excerpt| excerpt.buffer.diagnostic_group(group_id))
1770 }
1771
1772 pub fn diagnostics_in_range<'a, T, O>(
1773 &'a self,
1774 range: Range<T>,
1775 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1776 where
1777 T: 'a + ToOffset,
1778 O: 'a + text::FromAnchor,
1779 {
1780 self.as_singleton().into_iter().flat_map(move |excerpt| {
1781 excerpt
1782 .buffer
1783 .diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1784 })
1785 }
1786
1787 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1788 let range = range.start.to_offset(self)..range.end.to_offset(self);
1789
1790 let mut cursor = self.excerpts.cursor::<usize>();
1791 cursor.seek(&range.start, Bias::Right, &());
1792 let start_excerpt = cursor.item();
1793
1794 cursor.seek(&range.end, Bias::Right, &());
1795 let end_excerpt = cursor.item();
1796
1797 start_excerpt
1798 .zip(end_excerpt)
1799 .and_then(|(start_excerpt, end_excerpt)| {
1800 if start_excerpt.id != end_excerpt.id {
1801 return None;
1802 }
1803
1804 let excerpt_buffer_start =
1805 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1806 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1807
1808 let start_in_buffer =
1809 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1810 let end_in_buffer =
1811 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1812 let mut ancestor_buffer_range = start_excerpt
1813 .buffer
1814 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1815 ancestor_buffer_range.start =
1816 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1817 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1818
1819 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1820 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1821 Some(start..end)
1822 })
1823 }
1824
1825 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
1826 let excerpt = self.as_singleton()?;
1827 let outline = excerpt.buffer.outline(theme)?;
1828 Some(Outline::new(
1829 outline
1830 .items
1831 .into_iter()
1832 .map(|item| OutlineItem {
1833 depth: item.depth,
1834 range: self.anchor_in_excerpt(excerpt.id.clone(), item.range.start)
1835 ..self.anchor_in_excerpt(excerpt.id.clone(), item.range.end),
1836 text: item.text,
1837 highlight_ranges: item.highlight_ranges,
1838 name_ranges: item.name_ranges,
1839 })
1840 .collect(),
1841 ))
1842 }
1843
1844 fn buffer_snapshot_for_excerpt<'a>(
1845 &'a self,
1846 excerpt_id: &'a ExcerptId,
1847 ) -> Option<(usize, &'a BufferSnapshot)> {
1848 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1849 cursor.seek(&Some(excerpt_id), Bias::Left, &());
1850 if let Some(excerpt) = cursor.item() {
1851 if excerpt.id == *excerpt_id {
1852 return Some((excerpt.buffer_id, &excerpt.buffer));
1853 }
1854 }
1855 None
1856 }
1857
1858 pub fn remote_selections_in_range<'a>(
1859 &'a self,
1860 range: &'a Range<Anchor>,
1861 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
1862 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1863 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
1864 cursor
1865 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
1866 .flat_map(move |excerpt| {
1867 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
1868 if excerpt.id == range.start.excerpt_id {
1869 query_range.start = range.start.text_anchor.clone();
1870 }
1871 if excerpt.id == range.end.excerpt_id {
1872 query_range.end = range.end.text_anchor.clone();
1873 }
1874
1875 excerpt
1876 .buffer
1877 .remote_selections_in_range(query_range)
1878 .flat_map(move |(replica_id, selections)| {
1879 selections.map(move |selection| {
1880 let mut start = Anchor {
1881 buffer_id: excerpt.buffer_id,
1882 excerpt_id: excerpt.id.clone(),
1883 text_anchor: selection.start.clone(),
1884 };
1885 let mut end = Anchor {
1886 buffer_id: excerpt.buffer_id,
1887 excerpt_id: excerpt.id.clone(),
1888 text_anchor: selection.end.clone(),
1889 };
1890 if range.start.cmp(&start, self).unwrap().is_gt() {
1891 start = range.start.clone();
1892 }
1893 if range.end.cmp(&end, self).unwrap().is_lt() {
1894 end = range.end.clone();
1895 }
1896
1897 (
1898 replica_id,
1899 Selection {
1900 id: selection.id,
1901 start,
1902 end,
1903 reversed: selection.reversed,
1904 goal: selection.goal,
1905 },
1906 )
1907 })
1908 })
1909 })
1910 }
1911}
1912
1913impl History {
1914 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
1915 self.transaction_depth += 1;
1916 if self.transaction_depth == 1 {
1917 let id = post_inc(&mut self.next_transaction_id);
1918 self.undo_stack.push(Transaction {
1919 id,
1920 buffer_transactions: Default::default(),
1921 first_edit_at: now,
1922 last_edit_at: now,
1923 });
1924 Some(id)
1925 } else {
1926 None
1927 }
1928 }
1929
1930 fn end_transaction(
1931 &mut self,
1932 now: Instant,
1933 buffer_transactions: HashSet<(usize, TransactionId)>,
1934 ) -> bool {
1935 assert_ne!(self.transaction_depth, 0);
1936 self.transaction_depth -= 1;
1937 if self.transaction_depth == 0 {
1938 if buffer_transactions.is_empty() {
1939 self.undo_stack.pop();
1940 false
1941 } else {
1942 let transaction = self.undo_stack.last_mut().unwrap();
1943 transaction.last_edit_at = now;
1944 transaction.buffer_transactions.extend(buffer_transactions);
1945 true
1946 }
1947 } else {
1948 false
1949 }
1950 }
1951
1952 fn pop_undo(&mut self) -> Option<&Transaction> {
1953 assert_eq!(self.transaction_depth, 0);
1954 if let Some(transaction) = self.undo_stack.pop() {
1955 self.redo_stack.push(transaction);
1956 self.redo_stack.last()
1957 } else {
1958 None
1959 }
1960 }
1961
1962 fn pop_redo(&mut self) -> Option<&Transaction> {
1963 assert_eq!(self.transaction_depth, 0);
1964 if let Some(transaction) = self.redo_stack.pop() {
1965 self.undo_stack.push(transaction);
1966 self.undo_stack.last()
1967 } else {
1968 None
1969 }
1970 }
1971
1972 fn group(&mut self) -> Option<TransactionId> {
1973 let mut new_len = self.undo_stack.len();
1974 let mut transactions = self.undo_stack.iter_mut();
1975
1976 if let Some(mut transaction) = transactions.next_back() {
1977 while let Some(prev_transaction) = transactions.next_back() {
1978 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
1979 {
1980 transaction = prev_transaction;
1981 new_len -= 1;
1982 } else {
1983 break;
1984 }
1985 }
1986 }
1987
1988 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
1989 if let Some(last_transaction) = transactions_to_keep.last_mut() {
1990 if let Some(transaction) = transactions_to_merge.last() {
1991 last_transaction.last_edit_at = transaction.last_edit_at;
1992 }
1993 }
1994
1995 self.undo_stack.truncate(new_len);
1996 self.undo_stack.last().map(|t| t.id)
1997 }
1998}
1999
2000impl Excerpt {
2001 fn new(
2002 id: ExcerptId,
2003 buffer_id: usize,
2004 buffer: BufferSnapshot,
2005 range: Range<text::Anchor>,
2006 has_trailing_newline: bool,
2007 ) -> Self {
2008 Excerpt {
2009 id,
2010 max_buffer_row: range.end.to_point(&buffer).row,
2011 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
2012 buffer_id,
2013 buffer,
2014 range,
2015 has_trailing_newline,
2016 }
2017 }
2018
2019 fn chunks_in_range<'a>(
2020 &'a self,
2021 range: Range<usize>,
2022 theme: Option<&'a SyntaxTheme>,
2023 ) -> ExcerptChunks<'a> {
2024 let content_start = self.range.start.to_offset(&self.buffer);
2025 let chunks_start = content_start + range.start;
2026 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2027
2028 let footer_height = if self.has_trailing_newline
2029 && range.start <= self.text_summary.bytes
2030 && range.end > self.text_summary.bytes
2031 {
2032 1
2033 } else {
2034 0
2035 };
2036
2037 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
2038
2039 ExcerptChunks {
2040 content_chunks,
2041 footer_height,
2042 }
2043 }
2044
2045 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
2046 let content_start = self.range.start.to_offset(&self.buffer);
2047 let bytes_start = content_start + range.start;
2048 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2049 let footer_height = if self.has_trailing_newline
2050 && range.start <= self.text_summary.bytes
2051 && range.end > self.text_summary.bytes
2052 {
2053 1
2054 } else {
2055 0
2056 };
2057 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
2058
2059 ExcerptBytes {
2060 content_bytes,
2061 footer_height,
2062 }
2063 }
2064
2065 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
2066 if text_anchor
2067 .cmp(&self.range.start, &self.buffer)
2068 .unwrap()
2069 .is_lt()
2070 {
2071 self.range.start.clone()
2072 } else if text_anchor
2073 .cmp(&self.range.end, &self.buffer)
2074 .unwrap()
2075 .is_gt()
2076 {
2077 self.range.end.clone()
2078 } else {
2079 text_anchor
2080 }
2081 }
2082
2083 fn contains(&self, anchor: &Anchor) -> bool {
2084 self.buffer_id == anchor.buffer_id
2085 && self
2086 .range
2087 .start
2088 .cmp(&anchor.text_anchor, &self.buffer)
2089 .unwrap()
2090 .is_le()
2091 && self
2092 .range
2093 .end
2094 .cmp(&anchor.text_anchor, &self.buffer)
2095 .unwrap()
2096 .is_ge()
2097 }
2098}
2099
2100impl fmt::Debug for Excerpt {
2101 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2102 f.debug_struct("Excerpt")
2103 .field("id", &self.id)
2104 .field("buffer_id", &self.buffer_id)
2105 .field("range", &self.range)
2106 .field("text_summary", &self.text_summary)
2107 .field("has_trailing_newline", &self.has_trailing_newline)
2108 .finish()
2109 }
2110}
2111
2112impl sum_tree::Item for Excerpt {
2113 type Summary = ExcerptSummary;
2114
2115 fn summary(&self) -> Self::Summary {
2116 let mut text = self.text_summary.clone();
2117 if self.has_trailing_newline {
2118 text += TextSummary::from("\n");
2119 }
2120 ExcerptSummary {
2121 excerpt_id: self.id.clone(),
2122 max_buffer_row: self.max_buffer_row,
2123 text,
2124 }
2125 }
2126}
2127
2128impl sum_tree::Summary for ExcerptSummary {
2129 type Context = ();
2130
2131 fn add_summary(&mut self, summary: &Self, _: &()) {
2132 debug_assert!(summary.excerpt_id > self.excerpt_id);
2133 self.excerpt_id = summary.excerpt_id.clone();
2134 self.text.add_summary(&summary.text, &());
2135 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
2136 }
2137}
2138
2139impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
2140 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2141 *self += &summary.text;
2142 }
2143}
2144
2145impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
2146 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2147 *self += summary.text.bytes;
2148 }
2149}
2150
2151impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
2152 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2153 Ord::cmp(self, &cursor_location.text.bytes)
2154 }
2155}
2156
2157impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
2158 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2159 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
2160 }
2161}
2162
2163impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
2164 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2165 *self += summary.text.lines;
2166 }
2167}
2168
2169impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
2170 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2171 *self += summary.text.lines_utf16
2172 }
2173}
2174
2175impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
2176 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2177 *self = Some(&summary.excerpt_id);
2178 }
2179}
2180
2181impl<'a> MultiBufferRows<'a> {
2182 pub fn seek(&mut self, row: u32) {
2183 self.buffer_row_range = 0..0;
2184
2185 self.excerpts
2186 .seek_forward(&Point::new(row, 0), Bias::Right, &());
2187 if self.excerpts.item().is_none() {
2188 self.excerpts.prev(&());
2189
2190 if self.excerpts.item().is_none() && row == 0 {
2191 self.buffer_row_range = 0..1;
2192 return;
2193 }
2194 }
2195
2196 if let Some(excerpt) = self.excerpts.item() {
2197 let overshoot = row - self.excerpts.start().row;
2198 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
2199 self.buffer_row_range.start = excerpt_start + overshoot;
2200 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
2201 }
2202 }
2203}
2204
2205impl<'a> Iterator for MultiBufferRows<'a> {
2206 type Item = Option<u32>;
2207
2208 fn next(&mut self) -> Option<Self::Item> {
2209 loop {
2210 if !self.buffer_row_range.is_empty() {
2211 let row = Some(self.buffer_row_range.start);
2212 self.buffer_row_range.start += 1;
2213 return Some(row);
2214 }
2215 self.excerpts.item()?;
2216 self.excerpts.next(&());
2217 let excerpt = self.excerpts.item()?;
2218 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
2219 self.buffer_row_range.end =
2220 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
2221 }
2222 }
2223}
2224
2225impl<'a> MultiBufferChunks<'a> {
2226 pub fn offset(&self) -> usize {
2227 self.range.start
2228 }
2229
2230 pub fn seek(&mut self, offset: usize) {
2231 self.range.start = offset;
2232 self.excerpts.seek(&offset, Bias::Right, &());
2233 if let Some(excerpt) = self.excerpts.item() {
2234 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2235 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
2236 self.theme,
2237 ));
2238 } else {
2239 self.excerpt_chunks = None;
2240 }
2241 }
2242}
2243
2244impl<'a> Iterator for MultiBufferChunks<'a> {
2245 type Item = Chunk<'a>;
2246
2247 fn next(&mut self) -> Option<Self::Item> {
2248 if self.range.is_empty() {
2249 None
2250 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
2251 self.range.start += chunk.text.len();
2252 Some(chunk)
2253 } else {
2254 self.excerpts.next(&());
2255 let excerpt = self.excerpts.item()?;
2256 self.excerpt_chunks = Some(
2257 excerpt.chunks_in_range(0..self.range.end - self.excerpts.start(), self.theme),
2258 );
2259 self.next()
2260 }
2261 }
2262}
2263
2264impl<'a> MultiBufferBytes<'a> {
2265 fn consume(&mut self, len: usize) {
2266 self.range.start += len;
2267 self.chunk = &self.chunk[len..];
2268
2269 if !self.range.is_empty() && self.chunk.is_empty() {
2270 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
2271 self.chunk = chunk;
2272 } else {
2273 self.excerpts.next(&());
2274 if let Some(excerpt) = self.excerpts.item() {
2275 let mut excerpt_bytes =
2276 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
2277 self.chunk = excerpt_bytes.next().unwrap();
2278 self.excerpt_bytes = Some(excerpt_bytes);
2279 }
2280 }
2281 }
2282 }
2283}
2284
2285impl<'a> Iterator for MultiBufferBytes<'a> {
2286 type Item = &'a [u8];
2287
2288 fn next(&mut self) -> Option<Self::Item> {
2289 let chunk = self.chunk;
2290 if chunk.is_empty() {
2291 None
2292 } else {
2293 self.consume(chunk.len());
2294 Some(chunk)
2295 }
2296 }
2297}
2298
2299impl<'a> io::Read for MultiBufferBytes<'a> {
2300 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2301 let len = cmp::min(buf.len(), self.chunk.len());
2302 buf[..len].copy_from_slice(&self.chunk[..len]);
2303 if len > 0 {
2304 self.consume(len);
2305 }
2306 Ok(len)
2307 }
2308}
2309
2310impl<'a> Iterator for ExcerptBytes<'a> {
2311 type Item = &'a [u8];
2312
2313 fn next(&mut self) -> Option<Self::Item> {
2314 if let Some(chunk) = self.content_bytes.next() {
2315 if !chunk.is_empty() {
2316 return Some(chunk);
2317 }
2318 }
2319
2320 if self.footer_height > 0 {
2321 let result = &NEWLINES[..self.footer_height];
2322 self.footer_height = 0;
2323 return Some(result);
2324 }
2325
2326 None
2327 }
2328}
2329
2330impl<'a> Iterator for ExcerptChunks<'a> {
2331 type Item = Chunk<'a>;
2332
2333 fn next(&mut self) -> Option<Self::Item> {
2334 if let Some(chunk) = self.content_chunks.next() {
2335 return Some(chunk);
2336 }
2337
2338 if self.footer_height > 0 {
2339 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2340 self.footer_height = 0;
2341 return Some(Chunk {
2342 text,
2343 ..Default::default()
2344 });
2345 }
2346
2347 None
2348 }
2349}
2350
2351impl ToOffset for Point {
2352 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2353 snapshot.point_to_offset(*self)
2354 }
2355}
2356
2357impl ToOffset for PointUtf16 {
2358 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2359 snapshot.point_utf16_to_offset(*self)
2360 }
2361}
2362
2363impl ToOffset for usize {
2364 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2365 assert!(*self <= snapshot.len(), "offset is out of range");
2366 *self
2367 }
2368}
2369
2370impl ToPoint for usize {
2371 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2372 snapshot.offset_to_point(*self)
2373 }
2374}
2375
2376impl ToPoint for Point {
2377 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2378 *self
2379 }
2380}
2381
2382#[cfg(test)]
2383mod tests {
2384 use super::*;
2385 use gpui::MutableAppContext;
2386 use language::{Buffer, Rope};
2387 use rand::prelude::*;
2388 use std::env;
2389 use text::{Point, RandomCharIter};
2390 use util::test::sample_text;
2391
2392 #[gpui::test]
2393 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2394 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2395 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2396
2397 let snapshot = multibuffer.read(cx).snapshot(cx);
2398 assert_eq!(snapshot.text(), buffer.read(cx).text());
2399
2400 assert_eq!(
2401 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2402 (0..buffer.read(cx).row_count())
2403 .map(Some)
2404 .collect::<Vec<_>>()
2405 );
2406
2407 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2408 let snapshot = multibuffer.read(cx).snapshot(cx);
2409
2410 assert_eq!(snapshot.text(), buffer.read(cx).text());
2411 assert_eq!(
2412 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2413 (0..buffer.read(cx).row_count())
2414 .map(Some)
2415 .collect::<Vec<_>>()
2416 );
2417 }
2418
2419 #[gpui::test]
2420 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2421 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2422 let guest_buffer = cx.add_model(|cx| {
2423 let message = host_buffer.read(cx).to_proto();
2424 Buffer::from_proto(1, message, None, cx).unwrap()
2425 });
2426 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2427 let snapshot = multibuffer.read(cx).snapshot(cx);
2428 assert_eq!(snapshot.text(), "a");
2429
2430 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2431 let snapshot = multibuffer.read(cx).snapshot(cx);
2432 assert_eq!(snapshot.text(), "ab");
2433
2434 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2435 let snapshot = multibuffer.read(cx).snapshot(cx);
2436 assert_eq!(snapshot.text(), "abc");
2437 }
2438
2439 #[gpui::test]
2440 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2441 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2442 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2443 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2444
2445 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2446 let subscription = multibuffer.subscribe();
2447 multibuffer.push_excerpt(
2448 ExcerptProperties {
2449 buffer: &buffer_1,
2450 range: Point::new(1, 2)..Point::new(2, 5),
2451 },
2452 cx,
2453 );
2454 assert_eq!(
2455 subscription.consume().into_inner(),
2456 [Edit {
2457 old: 0..0,
2458 new: 0..10
2459 }]
2460 );
2461
2462 multibuffer.push_excerpt(
2463 ExcerptProperties {
2464 buffer: &buffer_1,
2465 range: Point::new(3, 3)..Point::new(4, 4),
2466 },
2467 cx,
2468 );
2469 multibuffer.push_excerpt(
2470 ExcerptProperties {
2471 buffer: &buffer_2,
2472 range: Point::new(3, 1)..Point::new(3, 3),
2473 },
2474 cx,
2475 );
2476 assert_eq!(
2477 subscription.consume().into_inner(),
2478 [Edit {
2479 old: 10..10,
2480 new: 10..22
2481 }]
2482 );
2483
2484 subscription
2485 });
2486
2487 let snapshot = multibuffer.read(cx).snapshot(cx);
2488 assert_eq!(
2489 snapshot.text(),
2490 concat!(
2491 "bbbb\n", // Preserve newlines
2492 "ccccc\n", //
2493 "ddd\n", //
2494 "eeee\n", //
2495 "jj" //
2496 )
2497 );
2498 assert_eq!(
2499 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2500 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2501 );
2502 assert_eq!(
2503 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2504 [Some(3), Some(4), Some(3)]
2505 );
2506 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2507 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2508 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2509 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2510 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2511 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2512 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2513 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2514
2515 buffer_1.update(cx, |buffer, cx| {
2516 buffer.edit(
2517 [
2518 Point::new(0, 0)..Point::new(0, 0),
2519 Point::new(2, 1)..Point::new(2, 3),
2520 ],
2521 "\n",
2522 cx,
2523 );
2524 });
2525
2526 let snapshot = multibuffer.read(cx).snapshot(cx);
2527 assert_eq!(
2528 snapshot.text(),
2529 concat!(
2530 "bbbb\n", // Preserve newlines
2531 "c\n", //
2532 "cc\n", //
2533 "ddd\n", //
2534 "eeee\n", //
2535 "jj" //
2536 )
2537 );
2538
2539 assert_eq!(
2540 subscription.consume().into_inner(),
2541 [Edit {
2542 old: 6..8,
2543 new: 6..7
2544 }]
2545 );
2546
2547 let snapshot = multibuffer.read(cx).snapshot(cx);
2548 assert_eq!(
2549 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2550 Point::new(0, 4)
2551 );
2552 assert_eq!(
2553 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2554 Point::new(0, 4)
2555 );
2556 assert_eq!(
2557 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2558 Point::new(5, 1)
2559 );
2560 assert_eq!(
2561 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2562 Point::new(5, 2)
2563 );
2564 assert_eq!(
2565 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2566 Point::new(5, 2)
2567 );
2568
2569 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2570 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2571 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2572 multibuffer.snapshot(cx)
2573 });
2574
2575 assert_eq!(
2576 snapshot.text(),
2577 concat!(
2578 "bbbb\n", // Preserve newlines
2579 "c\n", //
2580 "cc\n", //
2581 "ddd\n", //
2582 "eeee", //
2583 )
2584 );
2585 }
2586
2587 #[gpui::test]
2588 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2589 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2590
2591 let snapshot = multibuffer.read(cx).snapshot(cx);
2592 assert_eq!(snapshot.text(), "");
2593 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2594 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2595 }
2596
2597 #[gpui::test]
2598 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2599 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2600 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2601 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2602 buffer.update(cx, |buffer, cx| {
2603 buffer.edit([0..0], "X", cx);
2604 buffer.edit([5..5], "Y", cx);
2605 });
2606 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2607
2608 assert_eq!(old_snapshot.text(), "abcd");
2609 assert_eq!(new_snapshot.text(), "XabcdY");
2610
2611 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2612 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2613 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2614 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2615 }
2616
2617 #[gpui::test]
2618 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2619 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2620 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2621 let multibuffer = cx.add_model(|cx| {
2622 let mut multibuffer = MultiBuffer::new(0);
2623 multibuffer.push_excerpt(
2624 ExcerptProperties {
2625 buffer: &buffer_1,
2626 range: 0..4,
2627 },
2628 cx,
2629 );
2630 multibuffer.push_excerpt(
2631 ExcerptProperties {
2632 buffer: &buffer_2,
2633 range: 0..5,
2634 },
2635 cx,
2636 );
2637 multibuffer
2638 });
2639 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2640
2641 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2642 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2643 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2644 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2645 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2646 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2647
2648 buffer_1.update(cx, |buffer, cx| {
2649 buffer.edit([0..0], "W", cx);
2650 buffer.edit([5..5], "X", cx);
2651 });
2652 buffer_2.update(cx, |buffer, cx| {
2653 buffer.edit([0..0], "Y", cx);
2654 buffer.edit([6..0], "Z", cx);
2655 });
2656 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2657
2658 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2659 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2660
2661 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2662 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2663 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2664 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2665 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2666 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2667 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2668 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2669 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2670 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2671 }
2672
2673 #[gpui::test]
2674 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
2675 cx: &mut MutableAppContext,
2676 ) {
2677 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2678 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
2679 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2680
2681 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
2682 // Add an excerpt from buffer 1 that spans this new insertion.
2683 buffer_1.update(cx, |buffer, cx| buffer.edit([4..4], "123", cx));
2684 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
2685 multibuffer.push_excerpt(
2686 ExcerptProperties {
2687 buffer: &buffer_1,
2688 range: 0..7,
2689 },
2690 cx,
2691 )
2692 });
2693
2694 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
2695 assert_eq!(snapshot_1.text(), "abcd123");
2696
2697 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
2698 let (excerpt_id_2, excerpt_id_3, _) = multibuffer.update(cx, |multibuffer, cx| {
2699 multibuffer.remove_excerpts([&excerpt_id_1], cx);
2700 (
2701 multibuffer.push_excerpt(
2702 ExcerptProperties {
2703 buffer: &buffer_2,
2704 range: 0..4,
2705 },
2706 cx,
2707 ),
2708 multibuffer.push_excerpt(
2709 ExcerptProperties {
2710 buffer: &buffer_2,
2711 range: 6..10,
2712 },
2713 cx,
2714 ),
2715 multibuffer.push_excerpt(
2716 ExcerptProperties {
2717 buffer: &buffer_2,
2718 range: 12..16,
2719 },
2720 cx,
2721 ),
2722 )
2723 });
2724 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
2725 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
2726
2727 // The old excerpt id has been reused.
2728 assert_eq!(excerpt_id_2, excerpt_id_1);
2729
2730 // Resolve some anchors from the previous snapshot in the new snapshot.
2731 // Although there is still an excerpt with the same id, it is for
2732 // a different buffer, so we don't attempt to resolve the old text
2733 // anchor in the new buffer.
2734 assert_eq!(
2735 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
2736 0
2737 );
2738 assert_eq!(
2739 snapshot_2.summaries_for_anchors::<usize, _>(&[
2740 snapshot_1.anchor_before(2),
2741 snapshot_1.anchor_after(3)
2742 ]),
2743 vec![0, 0]
2744 );
2745 let refresh =
2746 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
2747 assert_eq!(
2748 refresh,
2749 &[
2750 (0, snapshot_2.anchor_before(0), false),
2751 (1, snapshot_2.anchor_after(0), false),
2752 ]
2753 );
2754
2755 // Replace the middle excerpt with a smaller excerpt in buffer 2,
2756 // that intersects the old excerpt.
2757 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
2758 multibuffer.remove_excerpts([&excerpt_id_3], cx);
2759 multibuffer.insert_excerpt_after(
2760 &excerpt_id_3,
2761 ExcerptProperties {
2762 buffer: &buffer_2,
2763 range: 5..8,
2764 },
2765 cx,
2766 )
2767 });
2768
2769 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
2770 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
2771 assert_ne!(excerpt_id_5, excerpt_id_3);
2772
2773 // Resolve some anchors from the previous snapshot in the new snapshot.
2774 // The anchor in the middle excerpt snaps to the beginning of the
2775 // excerpt, since it is not
2776 let anchors = [
2777 snapshot_2.anchor_before(0),
2778 snapshot_2.anchor_after(2),
2779 snapshot_2.anchor_after(6),
2780 snapshot_2.anchor_after(14),
2781 ];
2782 assert_eq!(
2783 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
2784 &[0, 2, 9, 13]
2785 );
2786
2787 let new_anchors = snapshot_3.refresh_anchors(&anchors);
2788 assert_eq!(
2789 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
2790 &[(0, true), (1, true), (2, true), (3, true)]
2791 );
2792 assert_eq!(
2793 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
2794 &[0, 2, 7, 13]
2795 );
2796 }
2797
2798 #[gpui::test(iterations = 100)]
2799 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
2800 let operations = env::var("OPERATIONS")
2801 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2802 .unwrap_or(10);
2803
2804 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2805 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2806 let mut excerpt_ids = Vec::new();
2807 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2808 let mut anchors = Vec::new();
2809 let mut old_versions = Vec::new();
2810
2811 for _ in 0..operations {
2812 match rng.gen_range(0..100) {
2813 0..=19 if !buffers.is_empty() => {
2814 let buffer = buffers.choose(&mut rng).unwrap();
2815 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
2816 }
2817 20..=29 if !expected_excerpts.is_empty() => {
2818 let mut ids_to_remove = vec![];
2819 for _ in 0..rng.gen_range(1..=3) {
2820 if expected_excerpts.is_empty() {
2821 break;
2822 }
2823
2824 let ix = rng.gen_range(0..expected_excerpts.len());
2825 ids_to_remove.push(excerpt_ids.remove(ix));
2826 let (buffer, range) = expected_excerpts.remove(ix);
2827 let buffer = buffer.read(cx);
2828 log::info!(
2829 "Removing excerpt {}: {:?}",
2830 ix,
2831 buffer
2832 .text_for_range(range.to_offset(&buffer))
2833 .collect::<String>(),
2834 );
2835 }
2836 ids_to_remove.sort_unstable();
2837 multibuffer.update(cx, |multibuffer, cx| {
2838 multibuffer.remove_excerpts(&ids_to_remove, cx)
2839 });
2840 }
2841 30..=39 if !expected_excerpts.is_empty() => {
2842 let multibuffer = multibuffer.read(cx).read(cx);
2843 let offset =
2844 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
2845 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
2846 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
2847 anchors.push(multibuffer.anchor_at(offset, bias));
2848 anchors.sort_by(|a, b| a.cmp(&b, &multibuffer).unwrap());
2849 }
2850 40..=44 if !anchors.is_empty() => {
2851 let multibuffer = multibuffer.read(cx).read(cx);
2852
2853 anchors = multibuffer
2854 .refresh_anchors(&anchors)
2855 .into_iter()
2856 .map(|a| a.1)
2857 .collect();
2858
2859 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
2860 // overshoot its boundaries.
2861 let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
2862 for anchor in &anchors {
2863 if anchor.excerpt_id == ExcerptId::min()
2864 || anchor.excerpt_id == ExcerptId::max()
2865 {
2866 continue;
2867 }
2868
2869 cursor.seek_forward(&Some(&anchor.excerpt_id), Bias::Left, &());
2870 let excerpt = cursor.item().unwrap();
2871 assert_eq!(excerpt.id, anchor.excerpt_id);
2872 assert!(excerpt.contains(anchor));
2873 }
2874 }
2875 _ => {
2876 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
2877 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
2878 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
2879 buffers.last().unwrap()
2880 } else {
2881 buffers.choose(&mut rng).unwrap()
2882 };
2883
2884 let buffer = buffer_handle.read(cx);
2885 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
2886 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
2887 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
2888 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
2889 let prev_excerpt_id = excerpt_ids
2890 .get(prev_excerpt_ix)
2891 .cloned()
2892 .unwrap_or(ExcerptId::max());
2893 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
2894
2895 log::info!(
2896 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
2897 excerpt_ix,
2898 expected_excerpts.len(),
2899 buffer_handle.id(),
2900 buffer.text(),
2901 start_ix..end_ix,
2902 &buffer.text()[start_ix..end_ix]
2903 );
2904
2905 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
2906 multibuffer.insert_excerpt_after(
2907 &prev_excerpt_id,
2908 ExcerptProperties {
2909 buffer: &buffer_handle,
2910 range: start_ix..end_ix,
2911 },
2912 cx,
2913 )
2914 });
2915
2916 excerpt_ids.insert(excerpt_ix, excerpt_id);
2917 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
2918 }
2919 }
2920
2921 if rng.gen_bool(0.3) {
2922 multibuffer.update(cx, |multibuffer, cx| {
2923 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
2924 })
2925 }
2926
2927 let snapshot = multibuffer.read(cx).snapshot(cx);
2928
2929 let mut excerpt_starts = Vec::new();
2930 let mut expected_text = String::new();
2931 let mut expected_buffer_rows = Vec::new();
2932 for (buffer, range) in &expected_excerpts {
2933 let buffer = buffer.read(cx);
2934 let buffer_range = range.to_offset(buffer);
2935
2936 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
2937 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
2938 expected_text.push('\n');
2939
2940 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
2941 ..=buffer.offset_to_point(buffer_range.end).row;
2942 for row in buffer_row_range {
2943 expected_buffer_rows.push(Some(row));
2944 }
2945 }
2946 // Remove final trailing newline.
2947 if !expected_excerpts.is_empty() {
2948 expected_text.pop();
2949 }
2950
2951 // Always report one buffer row
2952 if expected_buffer_rows.is_empty() {
2953 expected_buffer_rows.push(Some(0));
2954 }
2955
2956 assert_eq!(snapshot.text(), expected_text);
2957 log::info!("MultiBuffer text: {:?}", expected_text);
2958
2959 assert_eq!(
2960 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2961 expected_buffer_rows,
2962 );
2963
2964 for _ in 0..5 {
2965 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
2966 assert_eq!(
2967 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
2968 &expected_buffer_rows[start_row..],
2969 "buffer_rows({})",
2970 start_row
2971 );
2972 }
2973
2974 assert_eq!(
2975 snapshot.max_buffer_row(),
2976 expected_buffer_rows
2977 .into_iter()
2978 .filter_map(|r| r)
2979 .max()
2980 .unwrap()
2981 );
2982
2983 let mut excerpt_starts = excerpt_starts.into_iter();
2984 for (buffer, range) in &expected_excerpts {
2985 let buffer_id = buffer.id();
2986 let buffer = buffer.read(cx);
2987 let buffer_range = range.to_offset(buffer);
2988 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
2989 let buffer_start_point_utf16 =
2990 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
2991
2992 let excerpt_start = excerpt_starts.next().unwrap();
2993 let mut offset = excerpt_start.bytes;
2994 let mut buffer_offset = buffer_range.start;
2995 let mut point = excerpt_start.lines;
2996 let mut buffer_point = buffer_start_point;
2997 let mut point_utf16 = excerpt_start.lines_utf16;
2998 let mut buffer_point_utf16 = buffer_start_point_utf16;
2999 for ch in buffer
3000 .snapshot()
3001 .chunks(buffer_range.clone(), None)
3002 .flat_map(|c| c.text.chars())
3003 {
3004 for _ in 0..ch.len_utf8() {
3005 let left_offset = snapshot.clip_offset(offset, Bias::Left);
3006 let right_offset = snapshot.clip_offset(offset, Bias::Right);
3007 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
3008 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
3009 assert_eq!(
3010 left_offset,
3011 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
3012 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
3013 offset,
3014 buffer_id,
3015 buffer_offset,
3016 );
3017 assert_eq!(
3018 right_offset,
3019 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
3020 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
3021 offset,
3022 buffer_id,
3023 buffer_offset,
3024 );
3025
3026 let left_point = snapshot.clip_point(point, Bias::Left);
3027 let right_point = snapshot.clip_point(point, Bias::Right);
3028 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
3029 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
3030 assert_eq!(
3031 left_point,
3032 excerpt_start.lines + (buffer_left_point - buffer_start_point),
3033 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
3034 point,
3035 buffer_id,
3036 buffer_point,
3037 );
3038 assert_eq!(
3039 right_point,
3040 excerpt_start.lines + (buffer_right_point - buffer_start_point),
3041 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
3042 point,
3043 buffer_id,
3044 buffer_point,
3045 );
3046
3047 assert_eq!(
3048 snapshot.point_to_offset(left_point),
3049 left_offset,
3050 "point_to_offset({:?})",
3051 left_point,
3052 );
3053 assert_eq!(
3054 snapshot.offset_to_point(left_offset),
3055 left_point,
3056 "offset_to_point({:?})",
3057 left_offset,
3058 );
3059
3060 offset += 1;
3061 buffer_offset += 1;
3062 if ch == '\n' {
3063 point += Point::new(1, 0);
3064 buffer_point += Point::new(1, 0);
3065 } else {
3066 point += Point::new(0, 1);
3067 buffer_point += Point::new(0, 1);
3068 }
3069 }
3070
3071 for _ in 0..ch.len_utf16() {
3072 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
3073 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
3074 let buffer_left_point_utf16 =
3075 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
3076 let buffer_right_point_utf16 =
3077 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
3078 assert_eq!(
3079 left_point_utf16,
3080 excerpt_start.lines_utf16
3081 + (buffer_left_point_utf16 - buffer_start_point_utf16),
3082 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
3083 point_utf16,
3084 buffer_id,
3085 buffer_point_utf16,
3086 );
3087 assert_eq!(
3088 right_point_utf16,
3089 excerpt_start.lines_utf16
3090 + (buffer_right_point_utf16 - buffer_start_point_utf16),
3091 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
3092 point_utf16,
3093 buffer_id,
3094 buffer_point_utf16,
3095 );
3096
3097 if ch == '\n' {
3098 point_utf16 += PointUtf16::new(1, 0);
3099 buffer_point_utf16 += PointUtf16::new(1, 0);
3100 } else {
3101 point_utf16 += PointUtf16::new(0, 1);
3102 buffer_point_utf16 += PointUtf16::new(0, 1);
3103 }
3104 }
3105 }
3106 }
3107
3108 for (row, line) in expected_text.split('\n').enumerate() {
3109 assert_eq!(
3110 snapshot.line_len(row as u32),
3111 line.len() as u32,
3112 "line_len({}).",
3113 row
3114 );
3115 }
3116
3117 let text_rope = Rope::from(expected_text.as_str());
3118 for _ in 0..10 {
3119 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3120 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3121
3122 let text_for_range = snapshot
3123 .text_for_range(start_ix..end_ix)
3124 .collect::<String>();
3125 assert_eq!(
3126 text_for_range,
3127 &expected_text[start_ix..end_ix],
3128 "incorrect text for range {:?}",
3129 start_ix..end_ix
3130 );
3131
3132 let excerpted_buffer_ranges =
3133 multibuffer.read(cx).excerpted_buffers(start_ix..end_ix, cx);
3134 let excerpted_buffers_text = excerpted_buffer_ranges
3135 .into_iter()
3136 .map(|(buffer, buffer_range)| {
3137 buffer
3138 .read(cx)
3139 .text_for_range(buffer_range)
3140 .collect::<String>()
3141 })
3142 .collect::<Vec<_>>()
3143 .join("\n");
3144 assert_eq!(excerpted_buffers_text, text_for_range);
3145
3146 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
3147 assert_eq!(
3148 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
3149 expected_summary,
3150 "incorrect summary for range {:?}",
3151 start_ix..end_ix
3152 );
3153 }
3154
3155 // Anchor resolution
3156 for (anchor, resolved_offset) in anchors
3157 .iter()
3158 .zip(snapshot.summaries_for_anchors::<usize, _>(&anchors))
3159 {
3160 assert!(resolved_offset <= snapshot.len());
3161 assert_eq!(
3162 snapshot.summary_for_anchor::<usize>(anchor),
3163 resolved_offset
3164 );
3165 }
3166
3167 for _ in 0..10 {
3168 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3169 assert_eq!(
3170 snapshot.reversed_chars_at(end_ix).collect::<String>(),
3171 expected_text[..end_ix].chars().rev().collect::<String>(),
3172 );
3173 }
3174
3175 for _ in 0..10 {
3176 let end_ix = rng.gen_range(0..=text_rope.len());
3177 let start_ix = rng.gen_range(0..=end_ix);
3178 assert_eq!(
3179 snapshot
3180 .bytes_in_range(start_ix..end_ix)
3181 .flatten()
3182 .copied()
3183 .collect::<Vec<_>>(),
3184 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
3185 "bytes_in_range({:?})",
3186 start_ix..end_ix,
3187 );
3188 }
3189 }
3190
3191 let snapshot = multibuffer.read(cx).snapshot(cx);
3192 for (old_snapshot, subscription) in old_versions {
3193 let edits = subscription.consume().into_inner();
3194
3195 log::info!(
3196 "applying subscription edits to old text: {:?}: {:?}",
3197 old_snapshot.text(),
3198 edits,
3199 );
3200
3201 let mut text = old_snapshot.text();
3202 for edit in edits {
3203 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
3204 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
3205 }
3206 assert_eq!(text.to_string(), snapshot.text());
3207 }
3208 }
3209
3210 #[gpui::test]
3211 fn test_history(cx: &mut MutableAppContext) {
3212 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
3213 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
3214 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3215 let group_interval = multibuffer.read(cx).history.group_interval;
3216 multibuffer.update(cx, |multibuffer, cx| {
3217 multibuffer.push_excerpt(
3218 ExcerptProperties {
3219 buffer: &buffer_1,
3220 range: 0..buffer_1.read(cx).len(),
3221 },
3222 cx,
3223 );
3224 multibuffer.push_excerpt(
3225 ExcerptProperties {
3226 buffer: &buffer_2,
3227 range: 0..buffer_2.read(cx).len(),
3228 },
3229 cx,
3230 );
3231 });
3232
3233 let mut now = Instant::now();
3234
3235 multibuffer.update(cx, |multibuffer, cx| {
3236 multibuffer.start_transaction_at(now, cx);
3237 multibuffer.edit(
3238 [
3239 Point::new(0, 0)..Point::new(0, 0),
3240 Point::new(1, 0)..Point::new(1, 0),
3241 ],
3242 "A",
3243 cx,
3244 );
3245 multibuffer.edit(
3246 [
3247 Point::new(0, 1)..Point::new(0, 1),
3248 Point::new(1, 1)..Point::new(1, 1),
3249 ],
3250 "B",
3251 cx,
3252 );
3253 multibuffer.end_transaction_at(now, cx);
3254 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3255
3256 now += 2 * group_interval;
3257 multibuffer.start_transaction_at(now, cx);
3258 multibuffer.edit([2..2], "C", cx);
3259 multibuffer.end_transaction_at(now, cx);
3260 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3261
3262 multibuffer.undo(cx);
3263 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3264
3265 multibuffer.undo(cx);
3266 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3267
3268 multibuffer.redo(cx);
3269 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3270
3271 multibuffer.redo(cx);
3272 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3273
3274 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
3275 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3276
3277 multibuffer.undo(cx);
3278 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3279
3280 multibuffer.redo(cx);
3281 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3282
3283 multibuffer.redo(cx);
3284 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3285
3286 multibuffer.undo(cx);
3287 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3288
3289 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
3290 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3291
3292 multibuffer.undo(cx);
3293 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
3294 });
3295 }
3296}