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 is_completion_trigger<T>(&self, position: T, text: &str, cx: &AppContext) -> bool
886 where
887 T: ToOffset,
888 {
889 let mut chars = text.chars();
890 let char = if let Some(char) = chars.next() {
891 char
892 } else {
893 return false;
894 };
895 if chars.next().is_some() {
896 return false;
897 }
898
899 if char.is_alphanumeric() || char == '_' {
900 return true;
901 }
902
903 let snapshot = self.snapshot(cx);
904 let anchor = snapshot.anchor_before(position);
905 let buffer = self.buffers.borrow()[&anchor.buffer_id].buffer.clone();
906 if let Some(language_server) = buffer.read(cx).language_server() {
907 language_server
908 .capabilities()
909 .completion_provider
910 .as_ref()
911 .map_or(false, |provider| {
912 provider
913 .trigger_characters
914 .as_ref()
915 .map_or(false, |characters| {
916 characters.iter().any(|string| string == text)
917 })
918 })
919 } else {
920 false
921 }
922 }
923
924 pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
925 self.buffers
926 .borrow()
927 .values()
928 .next()
929 .and_then(|state| state.buffer.read(cx).language())
930 }
931
932 pub fn file<'a>(&self, cx: &'a AppContext) -> Option<&'a dyn File> {
933 self.as_singleton()?.read(cx).file()
934 }
935
936 #[cfg(test)]
937 pub fn is_parsing(&self, cx: &AppContext) -> bool {
938 self.as_singleton().unwrap().read(cx).is_parsing()
939 }
940
941 fn sync(&self, cx: &AppContext) {
942 let mut snapshot = self.snapshot.borrow_mut();
943 let mut excerpts_to_edit = Vec::new();
944 let mut reparsed = false;
945 let mut diagnostics_updated = false;
946 let mut is_dirty = false;
947 let mut has_conflict = false;
948 let mut buffers = self.buffers.borrow_mut();
949 for buffer_state in buffers.values_mut() {
950 let buffer = buffer_state.buffer.read(cx);
951 let version = buffer.version();
952 let parse_count = buffer.parse_count();
953 let selections_update_count = buffer.selections_update_count();
954 let diagnostics_update_count = buffer.diagnostics_update_count();
955
956 let buffer_edited = version.changed_since(&buffer_state.last_version);
957 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
958 let buffer_selections_updated =
959 selections_update_count > buffer_state.last_selections_update_count;
960 let buffer_diagnostics_updated =
961 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
962 if buffer_edited
963 || buffer_reparsed
964 || buffer_selections_updated
965 || buffer_diagnostics_updated
966 {
967 buffer_state.last_version = version;
968 buffer_state.last_parse_count = parse_count;
969 buffer_state.last_selections_update_count = selections_update_count;
970 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
971 excerpts_to_edit.extend(
972 buffer_state
973 .excerpts
974 .iter()
975 .map(|excerpt_id| (excerpt_id, buffer_state.buffer.clone(), buffer_edited)),
976 );
977 }
978
979 reparsed |= buffer_reparsed;
980 diagnostics_updated |= buffer_diagnostics_updated;
981 is_dirty |= buffer.is_dirty();
982 has_conflict |= buffer.has_conflict();
983 }
984 if reparsed {
985 snapshot.parse_count += 1;
986 }
987 if diagnostics_updated {
988 snapshot.diagnostics_update_count += 1;
989 }
990 snapshot.is_dirty = is_dirty;
991 snapshot.has_conflict = has_conflict;
992
993 excerpts_to_edit.sort_unstable_by_key(|(excerpt_id, _, _)| *excerpt_id);
994
995 let mut edits = Vec::new();
996 let mut new_excerpts = SumTree::new();
997 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
998
999 for (id, buffer, buffer_edited) in excerpts_to_edit {
1000 new_excerpts.push_tree(cursor.slice(&Some(id), Bias::Left, &()), &());
1001 let old_excerpt = cursor.item().unwrap();
1002 let buffer_id = buffer.id();
1003 let buffer = buffer.read(cx);
1004
1005 let mut new_excerpt;
1006 if buffer_edited {
1007 edits.extend(
1008 buffer
1009 .edits_since_in_range::<usize>(
1010 old_excerpt.buffer.version(),
1011 old_excerpt.range.clone(),
1012 )
1013 .map(|mut edit| {
1014 let excerpt_old_start = cursor.start().1;
1015 let excerpt_new_start = new_excerpts.summary().text.bytes;
1016 edit.old.start += excerpt_old_start;
1017 edit.old.end += excerpt_old_start;
1018 edit.new.start += excerpt_new_start;
1019 edit.new.end += excerpt_new_start;
1020 edit
1021 }),
1022 );
1023
1024 new_excerpt = Excerpt::new(
1025 id.clone(),
1026 buffer_id,
1027 buffer.snapshot(),
1028 old_excerpt.range.clone(),
1029 old_excerpt.has_trailing_newline,
1030 );
1031 } else {
1032 new_excerpt = old_excerpt.clone();
1033 new_excerpt.buffer = buffer.snapshot();
1034 }
1035
1036 new_excerpts.push(new_excerpt, &());
1037 cursor.next(&());
1038 }
1039 new_excerpts.push_tree(cursor.suffix(&()), &());
1040
1041 drop(cursor);
1042 snapshot.excerpts = new_excerpts;
1043
1044 self.subscriptions.publish(edits);
1045 }
1046}
1047
1048#[cfg(any(test, feature = "test-support"))]
1049impl MultiBuffer {
1050 pub fn randomly_edit(
1051 &mut self,
1052 rng: &mut impl rand::Rng,
1053 count: usize,
1054 cx: &mut ModelContext<Self>,
1055 ) {
1056 use text::RandomCharIter;
1057
1058 let snapshot = self.read(cx);
1059 let mut old_ranges: Vec<Range<usize>> = Vec::new();
1060 for _ in 0..count {
1061 let last_end = old_ranges.last().map_or(0, |last_range| last_range.end + 1);
1062 if last_end > snapshot.len() {
1063 break;
1064 }
1065 let end_ix = snapshot.clip_offset(rng.gen_range(0..=last_end), Bias::Right);
1066 let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1067 old_ranges.push(start_ix..end_ix);
1068 }
1069 let new_text_len = rng.gen_range(0..10);
1070 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1071 log::info!("mutating multi-buffer at {:?}: {:?}", old_ranges, new_text);
1072 drop(snapshot);
1073
1074 self.edit(old_ranges.iter().cloned(), new_text.as_str(), cx);
1075 }
1076}
1077
1078impl Entity for MultiBuffer {
1079 type Event = language::Event;
1080}
1081
1082impl MultiBufferSnapshot {
1083 pub fn text(&self) -> String {
1084 self.chunks(0..self.len(), None)
1085 .map(|chunk| chunk.text)
1086 .collect()
1087 }
1088
1089 pub fn reversed_chars_at<'a, T: ToOffset>(
1090 &'a self,
1091 position: T,
1092 ) -> impl Iterator<Item = char> + 'a {
1093 let mut offset = position.to_offset(self);
1094 let mut cursor = self.excerpts.cursor::<usize>();
1095 cursor.seek(&offset, Bias::Left, &());
1096 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1097 let end_before_footer = cursor.start() + excerpt.text_summary.bytes;
1098 let start = excerpt.range.start.to_offset(&excerpt.buffer);
1099 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1100 excerpt.buffer.reversed_chunks_in_range(start..end)
1101 });
1102 iter::from_fn(move || {
1103 if offset == *cursor.start() {
1104 cursor.prev(&());
1105 let excerpt = cursor.item()?;
1106 excerpt_chunks = Some(
1107 excerpt
1108 .buffer
1109 .reversed_chunks_in_range(excerpt.range.clone()),
1110 );
1111 }
1112
1113 let excerpt = cursor.item().unwrap();
1114 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1115 offset -= 1;
1116 Some("\n")
1117 } else {
1118 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1119 offset -= chunk.len();
1120 Some(chunk)
1121 }
1122 })
1123 .flat_map(|c| c.chars().rev())
1124 }
1125
1126 pub fn chars_at<'a, T: ToOffset>(&'a self, position: T) -> impl Iterator<Item = char> + 'a {
1127 let offset = position.to_offset(self);
1128 self.text_for_range(offset..self.len())
1129 .flat_map(|chunk| chunk.chars())
1130 }
1131
1132 pub fn text_for_range<'a, T: ToOffset>(
1133 &'a self,
1134 range: Range<T>,
1135 ) -> impl Iterator<Item = &'a str> {
1136 self.chunks(range, None).map(|chunk| chunk.text)
1137 }
1138
1139 pub fn is_line_blank(&self, row: u32) -> bool {
1140 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1141 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1142 }
1143
1144 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1145 where
1146 T: ToOffset,
1147 {
1148 let position = position.to_offset(self);
1149 position == self.clip_offset(position, Bias::Left)
1150 && self
1151 .bytes_in_range(position..self.len())
1152 .flatten()
1153 .copied()
1154 .take(needle.len())
1155 .eq(needle.bytes())
1156 }
1157
1158 fn as_singleton(&self) -> Option<&Excerpt> {
1159 if self.singleton {
1160 self.excerpts.iter().next()
1161 } else {
1162 None
1163 }
1164 }
1165
1166 pub fn len(&self) -> usize {
1167 self.excerpts.summary().text.bytes
1168 }
1169
1170 pub fn max_buffer_row(&self) -> u32 {
1171 self.excerpts.summary().max_buffer_row
1172 }
1173
1174 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1175 if let Some(excerpt) = self.as_singleton() {
1176 return excerpt.buffer.clip_offset(offset, bias);
1177 }
1178
1179 let mut cursor = self.excerpts.cursor::<usize>();
1180 cursor.seek(&offset, Bias::Right, &());
1181 let overshoot = if let Some(excerpt) = cursor.item() {
1182 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1183 let buffer_offset = excerpt
1184 .buffer
1185 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1186 buffer_offset.saturating_sub(excerpt_start)
1187 } else {
1188 0
1189 };
1190 cursor.start() + overshoot
1191 }
1192
1193 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1194 if let Some(excerpt) = self.as_singleton() {
1195 return excerpt.buffer.clip_point(point, bias);
1196 }
1197
1198 let mut cursor = self.excerpts.cursor::<Point>();
1199 cursor.seek(&point, Bias::Right, &());
1200 let overshoot = if let Some(excerpt) = cursor.item() {
1201 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1202 let buffer_point = excerpt
1203 .buffer
1204 .clip_point(excerpt_start + (point - cursor.start()), bias);
1205 buffer_point.saturating_sub(excerpt_start)
1206 } else {
1207 Point::zero()
1208 };
1209 *cursor.start() + overshoot
1210 }
1211
1212 pub fn clip_point_utf16(&self, point: PointUtf16, bias: Bias) -> PointUtf16 {
1213 if let Some(excerpt) = self.as_singleton() {
1214 return excerpt.buffer.clip_point_utf16(point, bias);
1215 }
1216
1217 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1218 cursor.seek(&point, Bias::Right, &());
1219 let overshoot = if let Some(excerpt) = cursor.item() {
1220 let excerpt_start = excerpt
1221 .buffer
1222 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1223 let buffer_point = excerpt
1224 .buffer
1225 .clip_point_utf16(excerpt_start + (point - cursor.start()), bias);
1226 buffer_point.saturating_sub(excerpt_start)
1227 } else {
1228 PointUtf16::zero()
1229 };
1230 *cursor.start() + overshoot
1231 }
1232
1233 pub fn bytes_in_range<'a, T: ToOffset>(&'a self, range: Range<T>) -> MultiBufferBytes<'a> {
1234 let range = range.start.to_offset(self)..range.end.to_offset(self);
1235 let mut excerpts = self.excerpts.cursor::<usize>();
1236 excerpts.seek(&range.start, Bias::Right, &());
1237
1238 let mut chunk = &[][..];
1239 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1240 let mut excerpt_bytes = excerpt
1241 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1242 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1243 Some(excerpt_bytes)
1244 } else {
1245 None
1246 };
1247
1248 MultiBufferBytes {
1249 range,
1250 excerpts,
1251 excerpt_bytes,
1252 chunk,
1253 }
1254 }
1255
1256 pub fn buffer_rows<'a>(&'a self, start_row: u32) -> MultiBufferRows<'a> {
1257 let mut result = MultiBufferRows {
1258 buffer_row_range: 0..0,
1259 excerpts: self.excerpts.cursor(),
1260 };
1261 result.seek(start_row);
1262 result
1263 }
1264
1265 pub fn chunks<'a, T: ToOffset>(
1266 &'a self,
1267 range: Range<T>,
1268 theme: Option<&'a SyntaxTheme>,
1269 ) -> MultiBufferChunks<'a> {
1270 let range = range.start.to_offset(self)..range.end.to_offset(self);
1271 let mut chunks = MultiBufferChunks {
1272 range: range.clone(),
1273 excerpts: self.excerpts.cursor(),
1274 excerpt_chunks: None,
1275 theme,
1276 };
1277 chunks.seek(range.start);
1278 chunks
1279 }
1280
1281 pub fn offset_to_point(&self, offset: usize) -> Point {
1282 if let Some(excerpt) = self.as_singleton() {
1283 return excerpt.buffer.offset_to_point(offset);
1284 }
1285
1286 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1287 cursor.seek(&offset, Bias::Right, &());
1288 if let Some(excerpt) = cursor.item() {
1289 let (start_offset, start_point) = cursor.start();
1290 let overshoot = offset - start_offset;
1291 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1292 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1293 let buffer_point = excerpt
1294 .buffer
1295 .offset_to_point(excerpt_start_offset + overshoot);
1296 *start_point + (buffer_point - excerpt_start_point)
1297 } else {
1298 self.excerpts.summary().text.lines
1299 }
1300 }
1301
1302 pub fn point_to_offset(&self, point: Point) -> usize {
1303 if let Some(excerpt) = self.as_singleton() {
1304 return excerpt.buffer.point_to_offset(point);
1305 }
1306
1307 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1308 cursor.seek(&point, Bias::Right, &());
1309 if let Some(excerpt) = cursor.item() {
1310 let (start_point, start_offset) = cursor.start();
1311 let overshoot = point - start_point;
1312 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1313 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1314 let buffer_offset = excerpt
1315 .buffer
1316 .point_to_offset(excerpt_start_point + overshoot);
1317 *start_offset + buffer_offset - excerpt_start_offset
1318 } else {
1319 self.excerpts.summary().text.bytes
1320 }
1321 }
1322
1323 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1324 if let Some(excerpt) = self.as_singleton() {
1325 return excerpt.buffer.point_utf16_to_offset(point);
1326 }
1327
1328 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1329 cursor.seek(&point, Bias::Right, &());
1330 if let Some(excerpt) = cursor.item() {
1331 let (start_point, start_offset) = cursor.start();
1332 let overshoot = point - start_point;
1333 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1334 let excerpt_start_point = excerpt
1335 .buffer
1336 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1337 let buffer_offset = excerpt
1338 .buffer
1339 .point_utf16_to_offset(excerpt_start_point + overshoot);
1340 *start_offset + (buffer_offset - excerpt_start_offset)
1341 } else {
1342 self.excerpts.summary().text.bytes
1343 }
1344 }
1345
1346 pub fn indent_column_for_line(&self, row: u32) -> u32 {
1347 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
1348 buffer
1349 .indent_column_for_line(range.start.row)
1350 .min(range.end.column)
1351 .saturating_sub(range.start.column)
1352 } else {
1353 0
1354 }
1355 }
1356
1357 pub fn line_len(&self, row: u32) -> u32 {
1358 if let Some((_, range)) = self.buffer_line_for_row(row) {
1359 range.end.column - range.start.column
1360 } else {
1361 0
1362 }
1363 }
1364
1365 fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
1366 let mut cursor = self.excerpts.cursor::<Point>();
1367 cursor.seek(&Point::new(row, 0), Bias::Right, &());
1368 if let Some(excerpt) = cursor.item() {
1369 let overshoot = row - cursor.start().row;
1370 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1371 let excerpt_end = excerpt.range.end.to_point(&excerpt.buffer);
1372 let buffer_row = excerpt_start.row + overshoot;
1373 let line_start = Point::new(buffer_row, 0);
1374 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
1375 return Some((
1376 &excerpt.buffer,
1377 line_start.max(excerpt_start)..line_end.min(excerpt_end),
1378 ));
1379 }
1380 None
1381 }
1382
1383 pub fn max_point(&self) -> Point {
1384 self.text_summary().lines
1385 }
1386
1387 pub fn text_summary(&self) -> TextSummary {
1388 self.excerpts.summary().text
1389 }
1390
1391 pub fn text_summary_for_range<'a, D, O>(&'a self, range: Range<O>) -> D
1392 where
1393 D: TextDimension,
1394 O: ToOffset,
1395 {
1396 let mut summary = D::default();
1397 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1398 let mut cursor = self.excerpts.cursor::<usize>();
1399 cursor.seek(&range.start, Bias::Right, &());
1400 if let Some(excerpt) = cursor.item() {
1401 let mut end_before_newline = cursor.end(&());
1402 if excerpt.has_trailing_newline {
1403 end_before_newline -= 1;
1404 }
1405
1406 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1407 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
1408 let end_in_excerpt =
1409 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
1410 summary.add_assign(
1411 &excerpt
1412 .buffer
1413 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
1414 );
1415
1416 if range.end > end_before_newline {
1417 summary.add_assign(&D::from_text_summary(&TextSummary {
1418 bytes: 1,
1419 lines: Point::new(1 as u32, 0),
1420 lines_utf16: PointUtf16::new(1 as u32, 0),
1421 first_line_chars: 0,
1422 last_line_chars: 0,
1423 longest_row: 0,
1424 longest_row_chars: 0,
1425 }));
1426 }
1427
1428 cursor.next(&());
1429 }
1430
1431 if range.end > *cursor.start() {
1432 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
1433 &range.end,
1434 Bias::Right,
1435 &(),
1436 )));
1437 if let Some(excerpt) = cursor.item() {
1438 range.end = cmp::max(*cursor.start(), range.end);
1439
1440 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1441 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
1442 summary.add_assign(
1443 &excerpt
1444 .buffer
1445 .text_summary_for_range(excerpt_start..end_in_excerpt),
1446 );
1447 }
1448 }
1449
1450 summary
1451 }
1452
1453 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
1454 where
1455 D: TextDimension + Ord + Sub<D, Output = D>,
1456 {
1457 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1458 cursor.seek(&Some(&anchor.excerpt_id), Bias::Left, &());
1459 if cursor.item().is_none() {
1460 cursor.next(&());
1461 }
1462
1463 let mut position = D::from_text_summary(&cursor.start().text);
1464 if let Some(excerpt) = cursor.item() {
1465 if excerpt.id == anchor.excerpt_id && excerpt.buffer_id == anchor.buffer_id {
1466 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1467 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1468 let buffer_position = cmp::min(
1469 excerpt_buffer_end,
1470 anchor.text_anchor.summary::<D>(&excerpt.buffer),
1471 );
1472 if buffer_position > excerpt_buffer_start {
1473 position.add_assign(&(buffer_position - excerpt_buffer_start));
1474 }
1475 }
1476 }
1477 position
1478 }
1479
1480 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
1481 where
1482 D: TextDimension + Ord + Sub<D, Output = D>,
1483 I: 'a + IntoIterator<Item = &'a Anchor>,
1484 {
1485 let mut anchors = anchors.into_iter().peekable();
1486 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1487 let mut summaries = Vec::new();
1488 while let Some(anchor) = anchors.peek() {
1489 let excerpt_id = &anchor.excerpt_id;
1490 let buffer_id = anchor.buffer_id;
1491 let excerpt_anchors = iter::from_fn(|| {
1492 let anchor = anchors.peek()?;
1493 if anchor.excerpt_id == *excerpt_id && anchor.buffer_id == buffer_id {
1494 Some(&anchors.next().unwrap().text_anchor)
1495 } else {
1496 None
1497 }
1498 });
1499
1500 cursor.seek_forward(&Some(excerpt_id), Bias::Left, &());
1501 if cursor.item().is_none() {
1502 cursor.next(&());
1503 }
1504
1505 let position = D::from_text_summary(&cursor.start().text);
1506 if let Some(excerpt) = cursor.item() {
1507 if excerpt.id == *excerpt_id && excerpt.buffer_id == buffer_id {
1508 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1509 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1510 summaries.extend(
1511 excerpt
1512 .buffer
1513 .summaries_for_anchors::<D, _>(excerpt_anchors)
1514 .map(move |summary| {
1515 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
1516 let mut position = position.clone();
1517 let excerpt_buffer_start = excerpt_buffer_start.clone();
1518 if summary > excerpt_buffer_start {
1519 position.add_assign(&(summary - excerpt_buffer_start));
1520 }
1521 position
1522 }),
1523 );
1524 continue;
1525 }
1526 }
1527
1528 summaries.extend(excerpt_anchors.map(|_| position.clone()));
1529 }
1530
1531 summaries
1532 }
1533
1534 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
1535 where
1536 I: 'a + IntoIterator<Item = &'a Anchor>,
1537 {
1538 let mut anchors = anchors.into_iter().enumerate().peekable();
1539 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1540 let mut result = Vec::new();
1541 while let Some((_, anchor)) = anchors.peek() {
1542 let old_excerpt_id = &anchor.excerpt_id;
1543
1544 // Find the location where this anchor's excerpt should be.
1545 cursor.seek_forward(&Some(old_excerpt_id), Bias::Left, &());
1546 if cursor.item().is_none() {
1547 cursor.next(&());
1548 }
1549
1550 let next_excerpt = cursor.item();
1551 let prev_excerpt = cursor.prev_item();
1552
1553 // Process all of the anchors for this excerpt.
1554 while let Some((_, anchor)) = anchors.peek() {
1555 if anchor.excerpt_id != *old_excerpt_id {
1556 break;
1557 }
1558 let mut kept_position = false;
1559 let (anchor_ix, anchor) = anchors.next().unwrap();
1560 let mut anchor = anchor.clone();
1561
1562 // Leave min and max anchors unchanged.
1563 if *old_excerpt_id == ExcerptId::max() || *old_excerpt_id == ExcerptId::min() {
1564 kept_position = true;
1565 }
1566 // If the old excerpt still exists at this location, then leave
1567 // the anchor unchanged.
1568 else if next_excerpt.map_or(false, |excerpt| {
1569 excerpt.id == *old_excerpt_id && excerpt.contains(&anchor)
1570 }) {
1571 kept_position = true;
1572 }
1573 // If the old excerpt no longer exists at this location, then attempt to
1574 // find an equivalent position for this anchor in an adjacent excerpt.
1575 else {
1576 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
1577 if excerpt.contains(&anchor) {
1578 anchor.excerpt_id = excerpt.id.clone();
1579 kept_position = true;
1580 break;
1581 }
1582 }
1583 }
1584 // If there's no adjacent excerpt that contains the anchor's position,
1585 // then report that the anchor has lost its position.
1586 if !kept_position {
1587 anchor = if let Some(excerpt) = next_excerpt {
1588 let mut text_anchor = excerpt
1589 .range
1590 .start
1591 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1592 if text_anchor
1593 .cmp(&excerpt.range.end, &excerpt.buffer)
1594 .unwrap()
1595 .is_gt()
1596 {
1597 text_anchor = excerpt.range.end.clone();
1598 }
1599 Anchor {
1600 buffer_id: excerpt.buffer_id,
1601 excerpt_id: excerpt.id.clone(),
1602 text_anchor,
1603 }
1604 } else if let Some(excerpt) = prev_excerpt {
1605 let mut text_anchor = excerpt
1606 .range
1607 .end
1608 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1609 if text_anchor
1610 .cmp(&excerpt.range.start, &excerpt.buffer)
1611 .unwrap()
1612 .is_lt()
1613 {
1614 text_anchor = excerpt.range.start.clone();
1615 }
1616 Anchor {
1617 buffer_id: excerpt.buffer_id,
1618 excerpt_id: excerpt.id.clone(),
1619 text_anchor,
1620 }
1621 } else if anchor.text_anchor.bias == Bias::Left {
1622 Anchor::min()
1623 } else {
1624 Anchor::max()
1625 };
1626 }
1627
1628 result.push((anchor_ix, anchor, kept_position));
1629 }
1630 }
1631 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self).unwrap());
1632 result
1633 }
1634
1635 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
1636 self.anchor_at(position, Bias::Left)
1637 }
1638
1639 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
1640 self.anchor_at(position, Bias::Right)
1641 }
1642
1643 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
1644 let offset = position.to_offset(self);
1645 if let Some(excerpt) = self.as_singleton() {
1646 return Anchor {
1647 buffer_id: excerpt.buffer_id,
1648 excerpt_id: excerpt.id.clone(),
1649 text_anchor: excerpt.buffer.anchor_at(offset, bias),
1650 };
1651 }
1652
1653 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1654 cursor.seek(&offset, Bias::Right, &());
1655 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
1656 cursor.prev(&());
1657 }
1658 if let Some(excerpt) = cursor.item() {
1659 let mut overshoot = offset.saturating_sub(cursor.start().0);
1660 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
1661 overshoot -= 1;
1662 bias = Bias::Right;
1663 }
1664
1665 let buffer_start = excerpt.range.start.to_offset(&excerpt.buffer);
1666 let text_anchor =
1667 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
1668 Anchor {
1669 buffer_id: excerpt.buffer_id,
1670 excerpt_id: excerpt.id.clone(),
1671 text_anchor,
1672 }
1673 } else if offset == 0 && bias == Bias::Left {
1674 Anchor::min()
1675 } else {
1676 Anchor::max()
1677 }
1678 }
1679
1680 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
1681 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1682 cursor.seek(&Some(&excerpt_id), Bias::Left, &());
1683 if let Some(excerpt) = cursor.item() {
1684 if excerpt.id == excerpt_id {
1685 let text_anchor = excerpt.clip_anchor(text_anchor);
1686 drop(cursor);
1687 return Anchor {
1688 buffer_id: excerpt.buffer_id,
1689 excerpt_id,
1690 text_anchor,
1691 };
1692 }
1693 }
1694 panic!("excerpt not found");
1695 }
1696
1697 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
1698 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
1699 true
1700 } else if let Some((buffer_id, buffer_snapshot)) =
1701 self.buffer_snapshot_for_excerpt(&anchor.excerpt_id)
1702 {
1703 anchor.buffer_id == buffer_id && buffer_snapshot.can_resolve(&anchor.text_anchor)
1704 } else {
1705 false
1706 }
1707 }
1708
1709 pub fn range_contains_excerpt_boundary<T: ToOffset>(&self, range: Range<T>) -> bool {
1710 let start = range.start.to_offset(self);
1711 let end = range.end.to_offset(self);
1712 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1713 cursor.seek(&start, Bias::Right, &());
1714 let start_id = cursor
1715 .item()
1716 .or_else(|| cursor.prev_item())
1717 .map(|excerpt| &excerpt.id);
1718 cursor.seek_forward(&end, Bias::Right, &());
1719 let end_id = cursor
1720 .item()
1721 .or_else(|| cursor.prev_item())
1722 .map(|excerpt| &excerpt.id);
1723 start_id != end_id
1724 }
1725
1726 pub fn parse_count(&self) -> usize {
1727 self.parse_count
1728 }
1729
1730 pub fn enclosing_bracket_ranges<T: ToOffset>(
1731 &self,
1732 range: Range<T>,
1733 ) -> Option<(Range<usize>, Range<usize>)> {
1734 let range = range.start.to_offset(self)..range.end.to_offset(self);
1735
1736 let mut cursor = self.excerpts.cursor::<usize>();
1737 cursor.seek(&range.start, Bias::Right, &());
1738 let start_excerpt = cursor.item();
1739
1740 cursor.seek(&range.end, Bias::Right, &());
1741 let end_excerpt = cursor.item();
1742
1743 start_excerpt
1744 .zip(end_excerpt)
1745 .and_then(|(start_excerpt, end_excerpt)| {
1746 if start_excerpt.id != end_excerpt.id {
1747 return None;
1748 }
1749
1750 let excerpt_buffer_start =
1751 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1752 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1753
1754 let start_in_buffer =
1755 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1756 let end_in_buffer =
1757 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1758 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
1759 .buffer
1760 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
1761
1762 if start_bracket_range.start >= excerpt_buffer_start
1763 && end_bracket_range.end < excerpt_buffer_end
1764 {
1765 start_bracket_range.start =
1766 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
1767 start_bracket_range.end =
1768 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
1769 end_bracket_range.start =
1770 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
1771 end_bracket_range.end =
1772 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
1773 Some((start_bracket_range, end_bracket_range))
1774 } else {
1775 None
1776 }
1777 })
1778 }
1779
1780 pub fn diagnostics_update_count(&self) -> usize {
1781 self.diagnostics_update_count
1782 }
1783
1784 pub fn language(&self) -> Option<&Arc<Language>> {
1785 self.excerpts
1786 .iter()
1787 .next()
1788 .and_then(|excerpt| excerpt.buffer.language())
1789 }
1790
1791 pub fn is_dirty(&self) -> bool {
1792 self.is_dirty
1793 }
1794
1795 pub fn has_conflict(&self) -> bool {
1796 self.has_conflict
1797 }
1798
1799 pub fn diagnostic_group<'a, O>(
1800 &'a self,
1801 group_id: usize,
1802 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1803 where
1804 O: text::FromAnchor + 'a,
1805 {
1806 self.as_singleton()
1807 .into_iter()
1808 .flat_map(move |excerpt| excerpt.buffer.diagnostic_group(group_id))
1809 }
1810
1811 pub fn diagnostics_in_range<'a, T, O>(
1812 &'a self,
1813 range: Range<T>,
1814 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1815 where
1816 T: 'a + ToOffset,
1817 O: 'a + text::FromAnchor,
1818 {
1819 self.as_singleton().into_iter().flat_map(move |excerpt| {
1820 excerpt
1821 .buffer
1822 .diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1823 })
1824 }
1825
1826 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1827 let range = range.start.to_offset(self)..range.end.to_offset(self);
1828
1829 let mut cursor = self.excerpts.cursor::<usize>();
1830 cursor.seek(&range.start, Bias::Right, &());
1831 let start_excerpt = cursor.item();
1832
1833 cursor.seek(&range.end, Bias::Right, &());
1834 let end_excerpt = cursor.item();
1835
1836 start_excerpt
1837 .zip(end_excerpt)
1838 .and_then(|(start_excerpt, end_excerpt)| {
1839 if start_excerpt.id != end_excerpt.id {
1840 return None;
1841 }
1842
1843 let excerpt_buffer_start =
1844 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1845 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1846
1847 let start_in_buffer =
1848 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1849 let end_in_buffer =
1850 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1851 let mut ancestor_buffer_range = start_excerpt
1852 .buffer
1853 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1854 ancestor_buffer_range.start =
1855 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1856 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1857
1858 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1859 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1860 Some(start..end)
1861 })
1862 }
1863
1864 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
1865 let excerpt = self.as_singleton()?;
1866 let outline = excerpt.buffer.outline(theme)?;
1867 Some(Outline::new(
1868 outline
1869 .items
1870 .into_iter()
1871 .map(|item| OutlineItem {
1872 depth: item.depth,
1873 range: self.anchor_in_excerpt(excerpt.id.clone(), item.range.start)
1874 ..self.anchor_in_excerpt(excerpt.id.clone(), item.range.end),
1875 text: item.text,
1876 highlight_ranges: item.highlight_ranges,
1877 name_ranges: item.name_ranges,
1878 })
1879 .collect(),
1880 ))
1881 }
1882
1883 fn buffer_snapshot_for_excerpt<'a>(
1884 &'a self,
1885 excerpt_id: &'a ExcerptId,
1886 ) -> Option<(usize, &'a BufferSnapshot)> {
1887 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1888 cursor.seek(&Some(excerpt_id), Bias::Left, &());
1889 if let Some(excerpt) = cursor.item() {
1890 if excerpt.id == *excerpt_id {
1891 return Some((excerpt.buffer_id, &excerpt.buffer));
1892 }
1893 }
1894 None
1895 }
1896
1897 pub fn remote_selections_in_range<'a>(
1898 &'a self,
1899 range: &'a Range<Anchor>,
1900 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
1901 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1902 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
1903 cursor
1904 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
1905 .flat_map(move |excerpt| {
1906 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
1907 if excerpt.id == range.start.excerpt_id {
1908 query_range.start = range.start.text_anchor.clone();
1909 }
1910 if excerpt.id == range.end.excerpt_id {
1911 query_range.end = range.end.text_anchor.clone();
1912 }
1913
1914 excerpt
1915 .buffer
1916 .remote_selections_in_range(query_range)
1917 .flat_map(move |(replica_id, selections)| {
1918 selections.map(move |selection| {
1919 let mut start = Anchor {
1920 buffer_id: excerpt.buffer_id,
1921 excerpt_id: excerpt.id.clone(),
1922 text_anchor: selection.start.clone(),
1923 };
1924 let mut end = Anchor {
1925 buffer_id: excerpt.buffer_id,
1926 excerpt_id: excerpt.id.clone(),
1927 text_anchor: selection.end.clone(),
1928 };
1929 if range.start.cmp(&start, self).unwrap().is_gt() {
1930 start = range.start.clone();
1931 }
1932 if range.end.cmp(&end, self).unwrap().is_lt() {
1933 end = range.end.clone();
1934 }
1935
1936 (
1937 replica_id,
1938 Selection {
1939 id: selection.id,
1940 start,
1941 end,
1942 reversed: selection.reversed,
1943 goal: selection.goal,
1944 },
1945 )
1946 })
1947 })
1948 })
1949 }
1950}
1951
1952impl History {
1953 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
1954 self.transaction_depth += 1;
1955 if self.transaction_depth == 1 {
1956 let id = post_inc(&mut self.next_transaction_id);
1957 self.undo_stack.push(Transaction {
1958 id,
1959 buffer_transactions: Default::default(),
1960 first_edit_at: now,
1961 last_edit_at: now,
1962 });
1963 Some(id)
1964 } else {
1965 None
1966 }
1967 }
1968
1969 fn end_transaction(
1970 &mut self,
1971 now: Instant,
1972 buffer_transactions: HashSet<(usize, TransactionId)>,
1973 ) -> bool {
1974 assert_ne!(self.transaction_depth, 0);
1975 self.transaction_depth -= 1;
1976 if self.transaction_depth == 0 {
1977 if buffer_transactions.is_empty() {
1978 self.undo_stack.pop();
1979 false
1980 } else {
1981 let transaction = self.undo_stack.last_mut().unwrap();
1982 transaction.last_edit_at = now;
1983 transaction.buffer_transactions.extend(buffer_transactions);
1984 true
1985 }
1986 } else {
1987 false
1988 }
1989 }
1990
1991 fn pop_undo(&mut self) -> Option<&Transaction> {
1992 assert_eq!(self.transaction_depth, 0);
1993 if let Some(transaction) = self.undo_stack.pop() {
1994 self.redo_stack.push(transaction);
1995 self.redo_stack.last()
1996 } else {
1997 None
1998 }
1999 }
2000
2001 fn pop_redo(&mut self) -> Option<&Transaction> {
2002 assert_eq!(self.transaction_depth, 0);
2003 if let Some(transaction) = self.redo_stack.pop() {
2004 self.undo_stack.push(transaction);
2005 self.undo_stack.last()
2006 } else {
2007 None
2008 }
2009 }
2010
2011 fn group(&mut self) -> Option<TransactionId> {
2012 let mut new_len = self.undo_stack.len();
2013 let mut transactions = self.undo_stack.iter_mut();
2014
2015 if let Some(mut transaction) = transactions.next_back() {
2016 while let Some(prev_transaction) = transactions.next_back() {
2017 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
2018 {
2019 transaction = prev_transaction;
2020 new_len -= 1;
2021 } else {
2022 break;
2023 }
2024 }
2025 }
2026
2027 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
2028 if let Some(last_transaction) = transactions_to_keep.last_mut() {
2029 if let Some(transaction) = transactions_to_merge.last() {
2030 last_transaction.last_edit_at = transaction.last_edit_at;
2031 }
2032 }
2033
2034 self.undo_stack.truncate(new_len);
2035 self.undo_stack.last().map(|t| t.id)
2036 }
2037}
2038
2039impl Excerpt {
2040 fn new(
2041 id: ExcerptId,
2042 buffer_id: usize,
2043 buffer: BufferSnapshot,
2044 range: Range<text::Anchor>,
2045 has_trailing_newline: bool,
2046 ) -> Self {
2047 Excerpt {
2048 id,
2049 max_buffer_row: range.end.to_point(&buffer).row,
2050 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
2051 buffer_id,
2052 buffer,
2053 range,
2054 has_trailing_newline,
2055 }
2056 }
2057
2058 fn chunks_in_range<'a>(
2059 &'a self,
2060 range: Range<usize>,
2061 theme: Option<&'a SyntaxTheme>,
2062 ) -> ExcerptChunks<'a> {
2063 let content_start = self.range.start.to_offset(&self.buffer);
2064 let chunks_start = content_start + range.start;
2065 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2066
2067 let footer_height = if self.has_trailing_newline
2068 && range.start <= self.text_summary.bytes
2069 && range.end > self.text_summary.bytes
2070 {
2071 1
2072 } else {
2073 0
2074 };
2075
2076 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
2077
2078 ExcerptChunks {
2079 content_chunks,
2080 footer_height,
2081 }
2082 }
2083
2084 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
2085 let content_start = self.range.start.to_offset(&self.buffer);
2086 let bytes_start = content_start + range.start;
2087 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2088 let footer_height = if self.has_trailing_newline
2089 && range.start <= self.text_summary.bytes
2090 && range.end > self.text_summary.bytes
2091 {
2092 1
2093 } else {
2094 0
2095 };
2096 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
2097
2098 ExcerptBytes {
2099 content_bytes,
2100 footer_height,
2101 }
2102 }
2103
2104 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
2105 if text_anchor
2106 .cmp(&self.range.start, &self.buffer)
2107 .unwrap()
2108 .is_lt()
2109 {
2110 self.range.start.clone()
2111 } else if text_anchor
2112 .cmp(&self.range.end, &self.buffer)
2113 .unwrap()
2114 .is_gt()
2115 {
2116 self.range.end.clone()
2117 } else {
2118 text_anchor
2119 }
2120 }
2121
2122 fn contains(&self, anchor: &Anchor) -> bool {
2123 self.buffer_id == anchor.buffer_id
2124 && self
2125 .range
2126 .start
2127 .cmp(&anchor.text_anchor, &self.buffer)
2128 .unwrap()
2129 .is_le()
2130 && self
2131 .range
2132 .end
2133 .cmp(&anchor.text_anchor, &self.buffer)
2134 .unwrap()
2135 .is_ge()
2136 }
2137}
2138
2139impl fmt::Debug for Excerpt {
2140 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2141 f.debug_struct("Excerpt")
2142 .field("id", &self.id)
2143 .field("buffer_id", &self.buffer_id)
2144 .field("range", &self.range)
2145 .field("text_summary", &self.text_summary)
2146 .field("has_trailing_newline", &self.has_trailing_newline)
2147 .finish()
2148 }
2149}
2150
2151impl sum_tree::Item for Excerpt {
2152 type Summary = ExcerptSummary;
2153
2154 fn summary(&self) -> Self::Summary {
2155 let mut text = self.text_summary.clone();
2156 if self.has_trailing_newline {
2157 text += TextSummary::from("\n");
2158 }
2159 ExcerptSummary {
2160 excerpt_id: self.id.clone(),
2161 max_buffer_row: self.max_buffer_row,
2162 text,
2163 }
2164 }
2165}
2166
2167impl sum_tree::Summary for ExcerptSummary {
2168 type Context = ();
2169
2170 fn add_summary(&mut self, summary: &Self, _: &()) {
2171 debug_assert!(summary.excerpt_id > self.excerpt_id);
2172 self.excerpt_id = summary.excerpt_id.clone();
2173 self.text.add_summary(&summary.text, &());
2174 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
2175 }
2176}
2177
2178impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
2179 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2180 *self += &summary.text;
2181 }
2182}
2183
2184impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
2185 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2186 *self += summary.text.bytes;
2187 }
2188}
2189
2190impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
2191 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2192 Ord::cmp(self, &cursor_location.text.bytes)
2193 }
2194}
2195
2196impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
2197 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2198 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
2199 }
2200}
2201
2202impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
2203 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2204 *self += summary.text.lines;
2205 }
2206}
2207
2208impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
2209 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2210 *self += summary.text.lines_utf16
2211 }
2212}
2213
2214impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
2215 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2216 *self = Some(&summary.excerpt_id);
2217 }
2218}
2219
2220impl<'a> MultiBufferRows<'a> {
2221 pub fn seek(&mut self, row: u32) {
2222 self.buffer_row_range = 0..0;
2223
2224 self.excerpts
2225 .seek_forward(&Point::new(row, 0), Bias::Right, &());
2226 if self.excerpts.item().is_none() {
2227 self.excerpts.prev(&());
2228
2229 if self.excerpts.item().is_none() && row == 0 {
2230 self.buffer_row_range = 0..1;
2231 return;
2232 }
2233 }
2234
2235 if let Some(excerpt) = self.excerpts.item() {
2236 let overshoot = row - self.excerpts.start().row;
2237 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
2238 self.buffer_row_range.start = excerpt_start + overshoot;
2239 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
2240 }
2241 }
2242}
2243
2244impl<'a> Iterator for MultiBufferRows<'a> {
2245 type Item = Option<u32>;
2246
2247 fn next(&mut self) -> Option<Self::Item> {
2248 loop {
2249 if !self.buffer_row_range.is_empty() {
2250 let row = Some(self.buffer_row_range.start);
2251 self.buffer_row_range.start += 1;
2252 return Some(row);
2253 }
2254 self.excerpts.item()?;
2255 self.excerpts.next(&());
2256 let excerpt = self.excerpts.item()?;
2257 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
2258 self.buffer_row_range.end =
2259 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
2260 }
2261 }
2262}
2263
2264impl<'a> MultiBufferChunks<'a> {
2265 pub fn offset(&self) -> usize {
2266 self.range.start
2267 }
2268
2269 pub fn seek(&mut self, offset: usize) {
2270 self.range.start = offset;
2271 self.excerpts.seek(&offset, Bias::Right, &());
2272 if let Some(excerpt) = self.excerpts.item() {
2273 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2274 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
2275 self.theme,
2276 ));
2277 } else {
2278 self.excerpt_chunks = None;
2279 }
2280 }
2281}
2282
2283impl<'a> Iterator for MultiBufferChunks<'a> {
2284 type Item = Chunk<'a>;
2285
2286 fn next(&mut self) -> Option<Self::Item> {
2287 if self.range.is_empty() {
2288 None
2289 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
2290 self.range.start += chunk.text.len();
2291 Some(chunk)
2292 } else {
2293 self.excerpts.next(&());
2294 let excerpt = self.excerpts.item()?;
2295 self.excerpt_chunks = Some(
2296 excerpt.chunks_in_range(0..self.range.end - self.excerpts.start(), self.theme),
2297 );
2298 self.next()
2299 }
2300 }
2301}
2302
2303impl<'a> MultiBufferBytes<'a> {
2304 fn consume(&mut self, len: usize) {
2305 self.range.start += len;
2306 self.chunk = &self.chunk[len..];
2307
2308 if !self.range.is_empty() && self.chunk.is_empty() {
2309 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
2310 self.chunk = chunk;
2311 } else {
2312 self.excerpts.next(&());
2313 if let Some(excerpt) = self.excerpts.item() {
2314 let mut excerpt_bytes =
2315 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
2316 self.chunk = excerpt_bytes.next().unwrap();
2317 self.excerpt_bytes = Some(excerpt_bytes);
2318 }
2319 }
2320 }
2321 }
2322}
2323
2324impl<'a> Iterator for MultiBufferBytes<'a> {
2325 type Item = &'a [u8];
2326
2327 fn next(&mut self) -> Option<Self::Item> {
2328 let chunk = self.chunk;
2329 if chunk.is_empty() {
2330 None
2331 } else {
2332 self.consume(chunk.len());
2333 Some(chunk)
2334 }
2335 }
2336}
2337
2338impl<'a> io::Read for MultiBufferBytes<'a> {
2339 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2340 let len = cmp::min(buf.len(), self.chunk.len());
2341 buf[..len].copy_from_slice(&self.chunk[..len]);
2342 if len > 0 {
2343 self.consume(len);
2344 }
2345 Ok(len)
2346 }
2347}
2348
2349impl<'a> Iterator for ExcerptBytes<'a> {
2350 type Item = &'a [u8];
2351
2352 fn next(&mut self) -> Option<Self::Item> {
2353 if let Some(chunk) = self.content_bytes.next() {
2354 if !chunk.is_empty() {
2355 return Some(chunk);
2356 }
2357 }
2358
2359 if self.footer_height > 0 {
2360 let result = &NEWLINES[..self.footer_height];
2361 self.footer_height = 0;
2362 return Some(result);
2363 }
2364
2365 None
2366 }
2367}
2368
2369impl<'a> Iterator for ExcerptChunks<'a> {
2370 type Item = Chunk<'a>;
2371
2372 fn next(&mut self) -> Option<Self::Item> {
2373 if let Some(chunk) = self.content_chunks.next() {
2374 return Some(chunk);
2375 }
2376
2377 if self.footer_height > 0 {
2378 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2379 self.footer_height = 0;
2380 return Some(Chunk {
2381 text,
2382 ..Default::default()
2383 });
2384 }
2385
2386 None
2387 }
2388}
2389
2390impl ToOffset for Point {
2391 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2392 snapshot.point_to_offset(*self)
2393 }
2394}
2395
2396impl ToOffset for PointUtf16 {
2397 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2398 snapshot.point_utf16_to_offset(*self)
2399 }
2400}
2401
2402impl ToOffset for usize {
2403 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2404 assert!(*self <= snapshot.len(), "offset is out of range");
2405 *self
2406 }
2407}
2408
2409impl ToPoint for usize {
2410 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2411 snapshot.offset_to_point(*self)
2412 }
2413}
2414
2415impl ToPoint for Point {
2416 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2417 *self
2418 }
2419}
2420
2421#[cfg(test)]
2422mod tests {
2423 use super::*;
2424 use gpui::MutableAppContext;
2425 use language::{Buffer, Rope};
2426 use rand::prelude::*;
2427 use std::env;
2428 use text::{Point, RandomCharIter};
2429 use util::test::sample_text;
2430
2431 #[gpui::test]
2432 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2433 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2434 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2435
2436 let snapshot = multibuffer.read(cx).snapshot(cx);
2437 assert_eq!(snapshot.text(), buffer.read(cx).text());
2438
2439 assert_eq!(
2440 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2441 (0..buffer.read(cx).row_count())
2442 .map(Some)
2443 .collect::<Vec<_>>()
2444 );
2445
2446 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2447 let snapshot = multibuffer.read(cx).snapshot(cx);
2448
2449 assert_eq!(snapshot.text(), buffer.read(cx).text());
2450 assert_eq!(
2451 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2452 (0..buffer.read(cx).row_count())
2453 .map(Some)
2454 .collect::<Vec<_>>()
2455 );
2456 }
2457
2458 #[gpui::test]
2459 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2460 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2461 let guest_buffer = cx.add_model(|cx| {
2462 let message = host_buffer.read(cx).to_proto();
2463 Buffer::from_proto(1, message, None, cx).unwrap()
2464 });
2465 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2466 let snapshot = multibuffer.read(cx).snapshot(cx);
2467 assert_eq!(snapshot.text(), "a");
2468
2469 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2470 let snapshot = multibuffer.read(cx).snapshot(cx);
2471 assert_eq!(snapshot.text(), "ab");
2472
2473 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2474 let snapshot = multibuffer.read(cx).snapshot(cx);
2475 assert_eq!(snapshot.text(), "abc");
2476 }
2477
2478 #[gpui::test]
2479 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2480 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2481 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2482 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2483
2484 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2485 let subscription = multibuffer.subscribe();
2486 multibuffer.push_excerpt(
2487 ExcerptProperties {
2488 buffer: &buffer_1,
2489 range: Point::new(1, 2)..Point::new(2, 5),
2490 },
2491 cx,
2492 );
2493 assert_eq!(
2494 subscription.consume().into_inner(),
2495 [Edit {
2496 old: 0..0,
2497 new: 0..10
2498 }]
2499 );
2500
2501 multibuffer.push_excerpt(
2502 ExcerptProperties {
2503 buffer: &buffer_1,
2504 range: Point::new(3, 3)..Point::new(4, 4),
2505 },
2506 cx,
2507 );
2508 multibuffer.push_excerpt(
2509 ExcerptProperties {
2510 buffer: &buffer_2,
2511 range: Point::new(3, 1)..Point::new(3, 3),
2512 },
2513 cx,
2514 );
2515 assert_eq!(
2516 subscription.consume().into_inner(),
2517 [Edit {
2518 old: 10..10,
2519 new: 10..22
2520 }]
2521 );
2522
2523 subscription
2524 });
2525
2526 let snapshot = multibuffer.read(cx).snapshot(cx);
2527 assert_eq!(
2528 snapshot.text(),
2529 concat!(
2530 "bbbb\n", // Preserve newlines
2531 "ccccc\n", //
2532 "ddd\n", //
2533 "eeee\n", //
2534 "jj" //
2535 )
2536 );
2537 assert_eq!(
2538 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2539 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2540 );
2541 assert_eq!(
2542 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2543 [Some(3), Some(4), Some(3)]
2544 );
2545 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2546 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2547 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2548 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2549 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2550 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2551 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2552 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2553
2554 buffer_1.update(cx, |buffer, cx| {
2555 buffer.edit(
2556 [
2557 Point::new(0, 0)..Point::new(0, 0),
2558 Point::new(2, 1)..Point::new(2, 3),
2559 ],
2560 "\n",
2561 cx,
2562 );
2563 });
2564
2565 let snapshot = multibuffer.read(cx).snapshot(cx);
2566 assert_eq!(
2567 snapshot.text(),
2568 concat!(
2569 "bbbb\n", // Preserve newlines
2570 "c\n", //
2571 "cc\n", //
2572 "ddd\n", //
2573 "eeee\n", //
2574 "jj" //
2575 )
2576 );
2577
2578 assert_eq!(
2579 subscription.consume().into_inner(),
2580 [Edit {
2581 old: 6..8,
2582 new: 6..7
2583 }]
2584 );
2585
2586 let snapshot = multibuffer.read(cx).snapshot(cx);
2587 assert_eq!(
2588 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2589 Point::new(0, 4)
2590 );
2591 assert_eq!(
2592 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2593 Point::new(0, 4)
2594 );
2595 assert_eq!(
2596 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2597 Point::new(5, 1)
2598 );
2599 assert_eq!(
2600 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2601 Point::new(5, 2)
2602 );
2603 assert_eq!(
2604 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2605 Point::new(5, 2)
2606 );
2607
2608 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2609 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2610 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2611 multibuffer.snapshot(cx)
2612 });
2613
2614 assert_eq!(
2615 snapshot.text(),
2616 concat!(
2617 "bbbb\n", // Preserve newlines
2618 "c\n", //
2619 "cc\n", //
2620 "ddd\n", //
2621 "eeee", //
2622 )
2623 );
2624 }
2625
2626 #[gpui::test]
2627 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2628 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2629
2630 let snapshot = multibuffer.read(cx).snapshot(cx);
2631 assert_eq!(snapshot.text(), "");
2632 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2633 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2634 }
2635
2636 #[gpui::test]
2637 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2638 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2639 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2640 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2641 buffer.update(cx, |buffer, cx| {
2642 buffer.edit([0..0], "X", cx);
2643 buffer.edit([5..5], "Y", cx);
2644 });
2645 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2646
2647 assert_eq!(old_snapshot.text(), "abcd");
2648 assert_eq!(new_snapshot.text(), "XabcdY");
2649
2650 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2651 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2652 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2653 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2654 }
2655
2656 #[gpui::test]
2657 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2658 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2659 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2660 let multibuffer = cx.add_model(|cx| {
2661 let mut multibuffer = MultiBuffer::new(0);
2662 multibuffer.push_excerpt(
2663 ExcerptProperties {
2664 buffer: &buffer_1,
2665 range: 0..4,
2666 },
2667 cx,
2668 );
2669 multibuffer.push_excerpt(
2670 ExcerptProperties {
2671 buffer: &buffer_2,
2672 range: 0..5,
2673 },
2674 cx,
2675 );
2676 multibuffer
2677 });
2678 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2679
2680 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2681 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2682 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2683 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2684 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2685 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2686
2687 buffer_1.update(cx, |buffer, cx| {
2688 buffer.edit([0..0], "W", cx);
2689 buffer.edit([5..5], "X", cx);
2690 });
2691 buffer_2.update(cx, |buffer, cx| {
2692 buffer.edit([0..0], "Y", cx);
2693 buffer.edit([6..0], "Z", cx);
2694 });
2695 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2696
2697 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2698 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2699
2700 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2701 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2702 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2703 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2704 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2705 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2706 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2707 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2708 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2709 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2710 }
2711
2712 #[gpui::test]
2713 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
2714 cx: &mut MutableAppContext,
2715 ) {
2716 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2717 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
2718 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2719
2720 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
2721 // Add an excerpt from buffer 1 that spans this new insertion.
2722 buffer_1.update(cx, |buffer, cx| buffer.edit([4..4], "123", cx));
2723 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
2724 multibuffer.push_excerpt(
2725 ExcerptProperties {
2726 buffer: &buffer_1,
2727 range: 0..7,
2728 },
2729 cx,
2730 )
2731 });
2732
2733 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
2734 assert_eq!(snapshot_1.text(), "abcd123");
2735
2736 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
2737 let (excerpt_id_2, excerpt_id_3, _) = multibuffer.update(cx, |multibuffer, cx| {
2738 multibuffer.remove_excerpts([&excerpt_id_1], cx);
2739 (
2740 multibuffer.push_excerpt(
2741 ExcerptProperties {
2742 buffer: &buffer_2,
2743 range: 0..4,
2744 },
2745 cx,
2746 ),
2747 multibuffer.push_excerpt(
2748 ExcerptProperties {
2749 buffer: &buffer_2,
2750 range: 6..10,
2751 },
2752 cx,
2753 ),
2754 multibuffer.push_excerpt(
2755 ExcerptProperties {
2756 buffer: &buffer_2,
2757 range: 12..16,
2758 },
2759 cx,
2760 ),
2761 )
2762 });
2763 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
2764 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
2765
2766 // The old excerpt id has been reused.
2767 assert_eq!(excerpt_id_2, excerpt_id_1);
2768
2769 // Resolve some anchors from the previous snapshot in the new snapshot.
2770 // Although there is still an excerpt with the same id, it is for
2771 // a different buffer, so we don't attempt to resolve the old text
2772 // anchor in the new buffer.
2773 assert_eq!(
2774 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
2775 0
2776 );
2777 assert_eq!(
2778 snapshot_2.summaries_for_anchors::<usize, _>(&[
2779 snapshot_1.anchor_before(2),
2780 snapshot_1.anchor_after(3)
2781 ]),
2782 vec![0, 0]
2783 );
2784 let refresh =
2785 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
2786 assert_eq!(
2787 refresh,
2788 &[
2789 (0, snapshot_2.anchor_before(0), false),
2790 (1, snapshot_2.anchor_after(0), false),
2791 ]
2792 );
2793
2794 // Replace the middle excerpt with a smaller excerpt in buffer 2,
2795 // that intersects the old excerpt.
2796 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
2797 multibuffer.remove_excerpts([&excerpt_id_3], cx);
2798 multibuffer.insert_excerpt_after(
2799 &excerpt_id_3,
2800 ExcerptProperties {
2801 buffer: &buffer_2,
2802 range: 5..8,
2803 },
2804 cx,
2805 )
2806 });
2807
2808 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
2809 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
2810 assert_ne!(excerpt_id_5, excerpt_id_3);
2811
2812 // Resolve some anchors from the previous snapshot in the new snapshot.
2813 // The anchor in the middle excerpt snaps to the beginning of the
2814 // excerpt, since it is not
2815 let anchors = [
2816 snapshot_2.anchor_before(0),
2817 snapshot_2.anchor_after(2),
2818 snapshot_2.anchor_after(6),
2819 snapshot_2.anchor_after(14),
2820 ];
2821 assert_eq!(
2822 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
2823 &[0, 2, 9, 13]
2824 );
2825
2826 let new_anchors = snapshot_3.refresh_anchors(&anchors);
2827 assert_eq!(
2828 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
2829 &[(0, true), (1, true), (2, true), (3, true)]
2830 );
2831 assert_eq!(
2832 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
2833 &[0, 2, 7, 13]
2834 );
2835 }
2836
2837 #[gpui::test(iterations = 100)]
2838 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
2839 let operations = env::var("OPERATIONS")
2840 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2841 .unwrap_or(10);
2842
2843 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2844 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2845 let mut excerpt_ids = Vec::new();
2846 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2847 let mut anchors = Vec::new();
2848 let mut old_versions = Vec::new();
2849
2850 for _ in 0..operations {
2851 match rng.gen_range(0..100) {
2852 0..=19 if !buffers.is_empty() => {
2853 let buffer = buffers.choose(&mut rng).unwrap();
2854 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
2855 }
2856 20..=29 if !expected_excerpts.is_empty() => {
2857 let mut ids_to_remove = vec![];
2858 for _ in 0..rng.gen_range(1..=3) {
2859 if expected_excerpts.is_empty() {
2860 break;
2861 }
2862
2863 let ix = rng.gen_range(0..expected_excerpts.len());
2864 ids_to_remove.push(excerpt_ids.remove(ix));
2865 let (buffer, range) = expected_excerpts.remove(ix);
2866 let buffer = buffer.read(cx);
2867 log::info!(
2868 "Removing excerpt {}: {:?}",
2869 ix,
2870 buffer
2871 .text_for_range(range.to_offset(&buffer))
2872 .collect::<String>(),
2873 );
2874 }
2875 ids_to_remove.sort_unstable();
2876 multibuffer.update(cx, |multibuffer, cx| {
2877 multibuffer.remove_excerpts(&ids_to_remove, cx)
2878 });
2879 }
2880 30..=39 if !expected_excerpts.is_empty() => {
2881 let multibuffer = multibuffer.read(cx).read(cx);
2882 let offset =
2883 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
2884 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
2885 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
2886 anchors.push(multibuffer.anchor_at(offset, bias));
2887 anchors.sort_by(|a, b| a.cmp(&b, &multibuffer).unwrap());
2888 }
2889 40..=44 if !anchors.is_empty() => {
2890 let multibuffer = multibuffer.read(cx).read(cx);
2891
2892 anchors = multibuffer
2893 .refresh_anchors(&anchors)
2894 .into_iter()
2895 .map(|a| a.1)
2896 .collect();
2897
2898 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
2899 // overshoot its boundaries.
2900 let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
2901 for anchor in &anchors {
2902 if anchor.excerpt_id == ExcerptId::min()
2903 || anchor.excerpt_id == ExcerptId::max()
2904 {
2905 continue;
2906 }
2907
2908 cursor.seek_forward(&Some(&anchor.excerpt_id), Bias::Left, &());
2909 let excerpt = cursor.item().unwrap();
2910 assert_eq!(excerpt.id, anchor.excerpt_id);
2911 assert!(excerpt.contains(anchor));
2912 }
2913 }
2914 _ => {
2915 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
2916 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
2917 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
2918 buffers.last().unwrap()
2919 } else {
2920 buffers.choose(&mut rng).unwrap()
2921 };
2922
2923 let buffer = buffer_handle.read(cx);
2924 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
2925 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
2926 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
2927 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
2928 let prev_excerpt_id = excerpt_ids
2929 .get(prev_excerpt_ix)
2930 .cloned()
2931 .unwrap_or(ExcerptId::max());
2932 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
2933
2934 log::info!(
2935 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
2936 excerpt_ix,
2937 expected_excerpts.len(),
2938 buffer_handle.id(),
2939 buffer.text(),
2940 start_ix..end_ix,
2941 &buffer.text()[start_ix..end_ix]
2942 );
2943
2944 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
2945 multibuffer.insert_excerpt_after(
2946 &prev_excerpt_id,
2947 ExcerptProperties {
2948 buffer: &buffer_handle,
2949 range: start_ix..end_ix,
2950 },
2951 cx,
2952 )
2953 });
2954
2955 excerpt_ids.insert(excerpt_ix, excerpt_id);
2956 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
2957 }
2958 }
2959
2960 if rng.gen_bool(0.3) {
2961 multibuffer.update(cx, |multibuffer, cx| {
2962 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
2963 })
2964 }
2965
2966 let snapshot = multibuffer.read(cx).snapshot(cx);
2967
2968 let mut excerpt_starts = Vec::new();
2969 let mut expected_text = String::new();
2970 let mut expected_buffer_rows = Vec::new();
2971 for (buffer, range) in &expected_excerpts {
2972 let buffer = buffer.read(cx);
2973 let buffer_range = range.to_offset(buffer);
2974
2975 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
2976 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
2977 expected_text.push('\n');
2978
2979 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
2980 ..=buffer.offset_to_point(buffer_range.end).row;
2981 for row in buffer_row_range {
2982 expected_buffer_rows.push(Some(row));
2983 }
2984 }
2985 // Remove final trailing newline.
2986 if !expected_excerpts.is_empty() {
2987 expected_text.pop();
2988 }
2989
2990 // Always report one buffer row
2991 if expected_buffer_rows.is_empty() {
2992 expected_buffer_rows.push(Some(0));
2993 }
2994
2995 assert_eq!(snapshot.text(), expected_text);
2996 log::info!("MultiBuffer text: {:?}", expected_text);
2997
2998 assert_eq!(
2999 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3000 expected_buffer_rows,
3001 );
3002
3003 for _ in 0..5 {
3004 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
3005 assert_eq!(
3006 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
3007 &expected_buffer_rows[start_row..],
3008 "buffer_rows({})",
3009 start_row
3010 );
3011 }
3012
3013 assert_eq!(
3014 snapshot.max_buffer_row(),
3015 expected_buffer_rows
3016 .into_iter()
3017 .filter_map(|r| r)
3018 .max()
3019 .unwrap()
3020 );
3021
3022 let mut excerpt_starts = excerpt_starts.into_iter();
3023 for (buffer, range) in &expected_excerpts {
3024 let buffer_id = buffer.id();
3025 let buffer = buffer.read(cx);
3026 let buffer_range = range.to_offset(buffer);
3027 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
3028 let buffer_start_point_utf16 =
3029 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
3030
3031 let excerpt_start = excerpt_starts.next().unwrap();
3032 let mut offset = excerpt_start.bytes;
3033 let mut buffer_offset = buffer_range.start;
3034 let mut point = excerpt_start.lines;
3035 let mut buffer_point = buffer_start_point;
3036 let mut point_utf16 = excerpt_start.lines_utf16;
3037 let mut buffer_point_utf16 = buffer_start_point_utf16;
3038 for ch in buffer
3039 .snapshot()
3040 .chunks(buffer_range.clone(), None)
3041 .flat_map(|c| c.text.chars())
3042 {
3043 for _ in 0..ch.len_utf8() {
3044 let left_offset = snapshot.clip_offset(offset, Bias::Left);
3045 let right_offset = snapshot.clip_offset(offset, Bias::Right);
3046 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
3047 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
3048 assert_eq!(
3049 left_offset,
3050 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
3051 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
3052 offset,
3053 buffer_id,
3054 buffer_offset,
3055 );
3056 assert_eq!(
3057 right_offset,
3058 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
3059 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
3060 offset,
3061 buffer_id,
3062 buffer_offset,
3063 );
3064
3065 let left_point = snapshot.clip_point(point, Bias::Left);
3066 let right_point = snapshot.clip_point(point, Bias::Right);
3067 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
3068 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
3069 assert_eq!(
3070 left_point,
3071 excerpt_start.lines + (buffer_left_point - buffer_start_point),
3072 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
3073 point,
3074 buffer_id,
3075 buffer_point,
3076 );
3077 assert_eq!(
3078 right_point,
3079 excerpt_start.lines + (buffer_right_point - buffer_start_point),
3080 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
3081 point,
3082 buffer_id,
3083 buffer_point,
3084 );
3085
3086 assert_eq!(
3087 snapshot.point_to_offset(left_point),
3088 left_offset,
3089 "point_to_offset({:?})",
3090 left_point,
3091 );
3092 assert_eq!(
3093 snapshot.offset_to_point(left_offset),
3094 left_point,
3095 "offset_to_point({:?})",
3096 left_offset,
3097 );
3098
3099 offset += 1;
3100 buffer_offset += 1;
3101 if ch == '\n' {
3102 point += Point::new(1, 0);
3103 buffer_point += Point::new(1, 0);
3104 } else {
3105 point += Point::new(0, 1);
3106 buffer_point += Point::new(0, 1);
3107 }
3108 }
3109
3110 for _ in 0..ch.len_utf16() {
3111 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
3112 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
3113 let buffer_left_point_utf16 =
3114 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
3115 let buffer_right_point_utf16 =
3116 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
3117 assert_eq!(
3118 left_point_utf16,
3119 excerpt_start.lines_utf16
3120 + (buffer_left_point_utf16 - buffer_start_point_utf16),
3121 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
3122 point_utf16,
3123 buffer_id,
3124 buffer_point_utf16,
3125 );
3126 assert_eq!(
3127 right_point_utf16,
3128 excerpt_start.lines_utf16
3129 + (buffer_right_point_utf16 - buffer_start_point_utf16),
3130 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
3131 point_utf16,
3132 buffer_id,
3133 buffer_point_utf16,
3134 );
3135
3136 if ch == '\n' {
3137 point_utf16 += PointUtf16::new(1, 0);
3138 buffer_point_utf16 += PointUtf16::new(1, 0);
3139 } else {
3140 point_utf16 += PointUtf16::new(0, 1);
3141 buffer_point_utf16 += PointUtf16::new(0, 1);
3142 }
3143 }
3144 }
3145 }
3146
3147 for (row, line) in expected_text.split('\n').enumerate() {
3148 assert_eq!(
3149 snapshot.line_len(row as u32),
3150 line.len() as u32,
3151 "line_len({}).",
3152 row
3153 );
3154 }
3155
3156 let text_rope = Rope::from(expected_text.as_str());
3157 for _ in 0..10 {
3158 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3159 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3160
3161 let text_for_range = snapshot
3162 .text_for_range(start_ix..end_ix)
3163 .collect::<String>();
3164 assert_eq!(
3165 text_for_range,
3166 &expected_text[start_ix..end_ix],
3167 "incorrect text for range {:?}",
3168 start_ix..end_ix
3169 );
3170
3171 let excerpted_buffer_ranges =
3172 multibuffer.read(cx).excerpted_buffers(start_ix..end_ix, cx);
3173 let excerpted_buffers_text = excerpted_buffer_ranges
3174 .into_iter()
3175 .map(|(buffer, buffer_range)| {
3176 buffer
3177 .read(cx)
3178 .text_for_range(buffer_range)
3179 .collect::<String>()
3180 })
3181 .collect::<Vec<_>>()
3182 .join("\n");
3183 assert_eq!(excerpted_buffers_text, text_for_range);
3184
3185 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
3186 assert_eq!(
3187 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
3188 expected_summary,
3189 "incorrect summary for range {:?}",
3190 start_ix..end_ix
3191 );
3192 }
3193
3194 // Anchor resolution
3195 for (anchor, resolved_offset) in anchors
3196 .iter()
3197 .zip(snapshot.summaries_for_anchors::<usize, _>(&anchors))
3198 {
3199 assert!(resolved_offset <= snapshot.len());
3200 assert_eq!(
3201 snapshot.summary_for_anchor::<usize>(anchor),
3202 resolved_offset
3203 );
3204 }
3205
3206 for _ in 0..10 {
3207 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3208 assert_eq!(
3209 snapshot.reversed_chars_at(end_ix).collect::<String>(),
3210 expected_text[..end_ix].chars().rev().collect::<String>(),
3211 );
3212 }
3213
3214 for _ in 0..10 {
3215 let end_ix = rng.gen_range(0..=text_rope.len());
3216 let start_ix = rng.gen_range(0..=end_ix);
3217 assert_eq!(
3218 snapshot
3219 .bytes_in_range(start_ix..end_ix)
3220 .flatten()
3221 .copied()
3222 .collect::<Vec<_>>(),
3223 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
3224 "bytes_in_range({:?})",
3225 start_ix..end_ix,
3226 );
3227 }
3228 }
3229
3230 let snapshot = multibuffer.read(cx).snapshot(cx);
3231 for (old_snapshot, subscription) in old_versions {
3232 let edits = subscription.consume().into_inner();
3233
3234 log::info!(
3235 "applying subscription edits to old text: {:?}: {:?}",
3236 old_snapshot.text(),
3237 edits,
3238 );
3239
3240 let mut text = old_snapshot.text();
3241 for edit in edits {
3242 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
3243 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
3244 }
3245 assert_eq!(text.to_string(), snapshot.text());
3246 }
3247 }
3248
3249 #[gpui::test]
3250 fn test_history(cx: &mut MutableAppContext) {
3251 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
3252 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
3253 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3254 let group_interval = multibuffer.read(cx).history.group_interval;
3255 multibuffer.update(cx, |multibuffer, cx| {
3256 multibuffer.push_excerpt(
3257 ExcerptProperties {
3258 buffer: &buffer_1,
3259 range: 0..buffer_1.read(cx).len(),
3260 },
3261 cx,
3262 );
3263 multibuffer.push_excerpt(
3264 ExcerptProperties {
3265 buffer: &buffer_2,
3266 range: 0..buffer_2.read(cx).len(),
3267 },
3268 cx,
3269 );
3270 });
3271
3272 let mut now = Instant::now();
3273
3274 multibuffer.update(cx, |multibuffer, cx| {
3275 multibuffer.start_transaction_at(now, cx);
3276 multibuffer.edit(
3277 [
3278 Point::new(0, 0)..Point::new(0, 0),
3279 Point::new(1, 0)..Point::new(1, 0),
3280 ],
3281 "A",
3282 cx,
3283 );
3284 multibuffer.edit(
3285 [
3286 Point::new(0, 1)..Point::new(0, 1),
3287 Point::new(1, 1)..Point::new(1, 1),
3288 ],
3289 "B",
3290 cx,
3291 );
3292 multibuffer.end_transaction_at(now, cx);
3293 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3294
3295 now += 2 * group_interval;
3296 multibuffer.start_transaction_at(now, cx);
3297 multibuffer.edit([2..2], "C", cx);
3298 multibuffer.end_transaction_at(now, cx);
3299 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3300
3301 multibuffer.undo(cx);
3302 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3303
3304 multibuffer.undo(cx);
3305 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3306
3307 multibuffer.redo(cx);
3308 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3309
3310 multibuffer.redo(cx);
3311 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3312
3313 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
3314 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3315
3316 multibuffer.undo(cx);
3317 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3318
3319 multibuffer.redo(cx);
3320 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3321
3322 multibuffer.redo(cx);
3323 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3324
3325 multibuffer.undo(cx);
3326 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3327
3328 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
3329 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3330
3331 multibuffer.undo(cx);
3332 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
3333 });
3334 }
3335}