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