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.changed_since(&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 provider_name: &'a str,
1501 group_id: usize,
1502 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1503 where
1504 O: text::FromAnchor + 'a,
1505 {
1506 self.as_singleton()
1507 .into_iter()
1508 .flat_map(move |buffer| buffer.diagnostic_group(provider_name, group_id))
1509 }
1510
1511 pub fn diagnostics_in_range<'a, T, O>(
1512 &'a self,
1513 range: Range<T>,
1514 ) -> impl Iterator<Item = (&'a str, DiagnosticEntry<O>)> + 'a
1515 where
1516 T: 'a + ToOffset,
1517 O: 'a + text::FromAnchor,
1518 {
1519 self.as_singleton().into_iter().flat_map(move |buffer| {
1520 buffer.diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1521 })
1522 }
1523
1524 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1525 let range = range.start.to_offset(self)..range.end.to_offset(self);
1526
1527 let mut cursor = self.excerpts.cursor::<usize>();
1528 cursor.seek(&range.start, Bias::Right, &());
1529 let start_excerpt = cursor.item();
1530
1531 cursor.seek(&range.end, Bias::Right, &());
1532 let end_excerpt = cursor.item();
1533
1534 start_excerpt
1535 .zip(end_excerpt)
1536 .and_then(|(start_excerpt, end_excerpt)| {
1537 if start_excerpt.id != end_excerpt.id {
1538 return None;
1539 }
1540
1541 let excerpt_buffer_start =
1542 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1543 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1544
1545 let start_in_buffer =
1546 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1547 let end_in_buffer =
1548 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1549 let mut ancestor_buffer_range = start_excerpt
1550 .buffer
1551 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1552 ancestor_buffer_range.start =
1553 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1554 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1555
1556 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1557 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1558 Some(start..end)
1559 })
1560 }
1561
1562 fn buffer_snapshot_for_excerpt<'a>(
1563 &'a self,
1564 excerpt_id: &'a ExcerptId,
1565 ) -> Option<&'a BufferSnapshot> {
1566 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1567 cursor.seek(&Some(excerpt_id), Bias::Left, &());
1568 if let Some(excerpt) = cursor.item() {
1569 if excerpt.id == *excerpt_id {
1570 return Some(&excerpt.buffer);
1571 }
1572 }
1573 None
1574 }
1575
1576 pub fn remote_selections_in_range<'a>(
1577 &'a self,
1578 range: &'a Range<Anchor>,
1579 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
1580 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1581 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
1582 cursor
1583 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
1584 .flat_map(move |excerpt| {
1585 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
1586 if excerpt.id == range.start.excerpt_id {
1587 query_range.start = range.start.text_anchor.clone();
1588 }
1589 if excerpt.id == range.end.excerpt_id {
1590 query_range.end = range.end.text_anchor.clone();
1591 }
1592
1593 excerpt
1594 .buffer
1595 .remote_selections_in_range(query_range)
1596 .flat_map(move |(replica_id, selections)| {
1597 selections.map(move |selection| {
1598 let mut start = Anchor {
1599 excerpt_id: excerpt.id.clone(),
1600 text_anchor: selection.start.clone(),
1601 };
1602 let mut end = Anchor {
1603 excerpt_id: excerpt.id.clone(),
1604 text_anchor: selection.end.clone(),
1605 };
1606 if range.start.cmp(&start, self).unwrap().is_gt() {
1607 start = range.start.clone();
1608 }
1609 if range.end.cmp(&end, self).unwrap().is_lt() {
1610 end = range.end.clone();
1611 }
1612
1613 (
1614 replica_id,
1615 Selection {
1616 id: selection.id,
1617 start,
1618 end,
1619 reversed: selection.reversed,
1620 goal: selection.goal,
1621 },
1622 )
1623 })
1624 })
1625 })
1626 }
1627}
1628
1629impl History {
1630 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
1631 self.transaction_depth += 1;
1632 if self.transaction_depth == 1 {
1633 let id = post_inc(&mut self.next_transaction_id);
1634 self.undo_stack.push(Transaction {
1635 id,
1636 buffer_transactions: Default::default(),
1637 first_edit_at: now,
1638 last_edit_at: now,
1639 });
1640 Some(id)
1641 } else {
1642 None
1643 }
1644 }
1645
1646 fn end_transaction(
1647 &mut self,
1648 now: Instant,
1649 buffer_transactions: HashSet<(usize, TransactionId)>,
1650 ) -> bool {
1651 assert_ne!(self.transaction_depth, 0);
1652 self.transaction_depth -= 1;
1653 if self.transaction_depth == 0 {
1654 if buffer_transactions.is_empty() {
1655 self.undo_stack.pop();
1656 false
1657 } else {
1658 let transaction = self.undo_stack.last_mut().unwrap();
1659 transaction.last_edit_at = now;
1660 transaction.buffer_transactions.extend(buffer_transactions);
1661 true
1662 }
1663 } else {
1664 false
1665 }
1666 }
1667
1668 fn pop_undo(&mut self) -> Option<&Transaction> {
1669 assert_eq!(self.transaction_depth, 0);
1670 if let Some(transaction) = self.undo_stack.pop() {
1671 self.redo_stack.push(transaction);
1672 self.redo_stack.last()
1673 } else {
1674 None
1675 }
1676 }
1677
1678 fn pop_redo(&mut self) -> Option<&Transaction> {
1679 assert_eq!(self.transaction_depth, 0);
1680 if let Some(transaction) = self.redo_stack.pop() {
1681 self.undo_stack.push(transaction);
1682 self.undo_stack.last()
1683 } else {
1684 None
1685 }
1686 }
1687
1688 fn group(&mut self) -> Option<TransactionId> {
1689 let mut new_len = self.undo_stack.len();
1690 let mut transactions = self.undo_stack.iter_mut();
1691
1692 if let Some(mut transaction) = transactions.next_back() {
1693 while let Some(prev_transaction) = transactions.next_back() {
1694 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
1695 {
1696 transaction = prev_transaction;
1697 new_len -= 1;
1698 } else {
1699 break;
1700 }
1701 }
1702 }
1703
1704 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
1705 if let Some(last_transaction) = transactions_to_keep.last_mut() {
1706 if let Some(transaction) = transactions_to_merge.last() {
1707 last_transaction.last_edit_at = transaction.last_edit_at;
1708 }
1709 }
1710
1711 self.undo_stack.truncate(new_len);
1712 self.undo_stack.last().map(|t| t.id)
1713 }
1714}
1715
1716impl Excerpt {
1717 fn new(
1718 id: ExcerptId,
1719 buffer_id: usize,
1720 buffer: BufferSnapshot,
1721 range: Range<text::Anchor>,
1722 has_trailing_newline: bool,
1723 ) -> Self {
1724 Excerpt {
1725 id,
1726 max_buffer_row: range.end.to_point(&buffer).row,
1727 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
1728 buffer_id,
1729 buffer,
1730 range,
1731 has_trailing_newline,
1732 }
1733 }
1734
1735 fn chunks_in_range<'a>(
1736 &'a self,
1737 range: Range<usize>,
1738 theme: Option<&'a SyntaxTheme>,
1739 ) -> ExcerptChunks<'a> {
1740 let content_start = self.range.start.to_offset(&self.buffer);
1741 let chunks_start = content_start + range.start;
1742 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
1743
1744 let footer_height = if self.has_trailing_newline
1745 && range.start <= self.text_summary.bytes
1746 && range.end > self.text_summary.bytes
1747 {
1748 1
1749 } else {
1750 0
1751 };
1752
1753 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
1754
1755 ExcerptChunks {
1756 content_chunks,
1757 footer_height,
1758 }
1759 }
1760
1761 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
1762 let content_start = self.range.start.to_offset(&self.buffer);
1763 let bytes_start = content_start + range.start;
1764 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
1765 let footer_height = if self.has_trailing_newline
1766 && range.start <= self.text_summary.bytes
1767 && range.end > self.text_summary.bytes
1768 {
1769 1
1770 } else {
1771 0
1772 };
1773 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
1774
1775 ExcerptBytes {
1776 content_bytes,
1777 footer_height,
1778 }
1779 }
1780
1781 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
1782 if text_anchor
1783 .cmp(&self.range.start, &self.buffer)
1784 .unwrap()
1785 .is_lt()
1786 {
1787 self.range.start.clone()
1788 } else if text_anchor
1789 .cmp(&self.range.end, &self.buffer)
1790 .unwrap()
1791 .is_gt()
1792 {
1793 self.range.end.clone()
1794 } else {
1795 text_anchor
1796 }
1797 }
1798}
1799
1800impl fmt::Debug for Excerpt {
1801 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1802 f.debug_struct("Excerpt")
1803 .field("id", &self.id)
1804 .field("buffer_id", &self.buffer_id)
1805 .field("range", &self.range)
1806 .field("text_summary", &self.text_summary)
1807 .field("has_trailing_newline", &self.has_trailing_newline)
1808 .finish()
1809 }
1810}
1811
1812impl sum_tree::Item for Excerpt {
1813 type Summary = ExcerptSummary;
1814
1815 fn summary(&self) -> Self::Summary {
1816 let mut text = self.text_summary.clone();
1817 if self.has_trailing_newline {
1818 text += TextSummary::from("\n");
1819 }
1820 ExcerptSummary {
1821 excerpt_id: self.id.clone(),
1822 max_buffer_row: self.max_buffer_row,
1823 text,
1824 }
1825 }
1826}
1827
1828impl sum_tree::Summary for ExcerptSummary {
1829 type Context = ();
1830
1831 fn add_summary(&mut self, summary: &Self, _: &()) {
1832 debug_assert!(summary.excerpt_id > self.excerpt_id);
1833 self.excerpt_id = summary.excerpt_id.clone();
1834 self.text.add_summary(&summary.text, &());
1835 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
1836 }
1837}
1838
1839impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
1840 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
1841 *self += &summary.text;
1842 }
1843}
1844
1845impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
1846 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
1847 *self += summary.text.bytes;
1848 }
1849}
1850
1851impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
1852 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
1853 Ord::cmp(self, &cursor_location.text.bytes)
1854 }
1855}
1856
1857impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
1858 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
1859 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
1860 }
1861}
1862
1863impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
1864 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
1865 *self += summary.text.lines;
1866 }
1867}
1868
1869impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
1870 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
1871 *self += summary.text.lines_utf16
1872 }
1873}
1874
1875impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
1876 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
1877 *self = Some(&summary.excerpt_id);
1878 }
1879}
1880
1881impl<'a> MultiBufferRows<'a> {
1882 pub fn seek(&mut self, row: u32) {
1883 self.buffer_row_range = 0..0;
1884
1885 self.excerpts
1886 .seek_forward(&Point::new(row, 0), Bias::Right, &());
1887 if self.excerpts.item().is_none() {
1888 self.excerpts.prev(&());
1889
1890 if self.excerpts.item().is_none() && row == 0 {
1891 self.buffer_row_range = 0..1;
1892 return;
1893 }
1894 }
1895
1896 if let Some(excerpt) = self.excerpts.item() {
1897 let overshoot = row - self.excerpts.start().row;
1898 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
1899 self.buffer_row_range.start = excerpt_start + overshoot;
1900 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
1901 }
1902 }
1903}
1904
1905impl<'a> Iterator for MultiBufferRows<'a> {
1906 type Item = Option<u32>;
1907
1908 fn next(&mut self) -> Option<Self::Item> {
1909 loop {
1910 if !self.buffer_row_range.is_empty() {
1911 let row = Some(self.buffer_row_range.start);
1912 self.buffer_row_range.start += 1;
1913 return Some(row);
1914 }
1915 self.excerpts.item()?;
1916 self.excerpts.next(&());
1917 let excerpt = self.excerpts.item()?;
1918 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
1919 self.buffer_row_range.end =
1920 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
1921 }
1922 }
1923}
1924
1925impl<'a> MultiBufferChunks<'a> {
1926 pub fn offset(&self) -> usize {
1927 self.range.start
1928 }
1929
1930 pub fn seek(&mut self, offset: usize) {
1931 self.range.start = offset;
1932 self.excerpts.seek(&offset, Bias::Right, &());
1933 if let Some(excerpt) = self.excerpts.item() {
1934 self.excerpt_chunks = Some(excerpt.chunks_in_range(
1935 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
1936 self.theme,
1937 ));
1938 } else {
1939 self.excerpt_chunks = None;
1940 }
1941 }
1942}
1943
1944impl<'a> Iterator for MultiBufferChunks<'a> {
1945 type Item = Chunk<'a>;
1946
1947 fn next(&mut self) -> Option<Self::Item> {
1948 if self.range.is_empty() {
1949 None
1950 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
1951 self.range.start += chunk.text.len();
1952 Some(chunk)
1953 } else {
1954 self.excerpts.next(&());
1955 let excerpt = self.excerpts.item()?;
1956 self.excerpt_chunks = Some(
1957 excerpt.chunks_in_range(0..self.range.end - self.excerpts.start(), self.theme),
1958 );
1959 self.next()
1960 }
1961 }
1962}
1963
1964impl<'a> MultiBufferBytes<'a> {
1965 fn consume(&mut self, len: usize) {
1966 self.range.start += len;
1967 self.chunk = &self.chunk[len..];
1968
1969 if !self.range.is_empty() && self.chunk.is_empty() {
1970 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
1971 self.chunk = chunk;
1972 } else {
1973 self.excerpts.next(&());
1974 if let Some(excerpt) = self.excerpts.item() {
1975 let mut excerpt_bytes =
1976 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
1977 self.chunk = excerpt_bytes.next().unwrap();
1978 self.excerpt_bytes = Some(excerpt_bytes);
1979 }
1980 }
1981 }
1982 }
1983}
1984
1985impl<'a> Iterator for MultiBufferBytes<'a> {
1986 type Item = &'a [u8];
1987
1988 fn next(&mut self) -> Option<Self::Item> {
1989 let chunk = self.chunk;
1990 if chunk.is_empty() {
1991 None
1992 } else {
1993 self.consume(chunk.len());
1994 Some(chunk)
1995 }
1996 }
1997}
1998
1999impl<'a> io::Read for MultiBufferBytes<'a> {
2000 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2001 let len = cmp::min(buf.len(), self.chunk.len());
2002 buf[..len].copy_from_slice(&self.chunk[..len]);
2003 if len > 0 {
2004 self.consume(len);
2005 }
2006 Ok(len)
2007 }
2008}
2009
2010impl<'a> Iterator for ExcerptBytes<'a> {
2011 type Item = &'a [u8];
2012
2013 fn next(&mut self) -> Option<Self::Item> {
2014 if let Some(chunk) = self.content_bytes.next() {
2015 if !chunk.is_empty() {
2016 return Some(chunk);
2017 }
2018 }
2019
2020 if self.footer_height > 0 {
2021 let result = &NEWLINES[..self.footer_height];
2022 self.footer_height = 0;
2023 return Some(result);
2024 }
2025
2026 None
2027 }
2028}
2029
2030impl<'a> Iterator for ExcerptChunks<'a> {
2031 type Item = Chunk<'a>;
2032
2033 fn next(&mut self) -> Option<Self::Item> {
2034 if let Some(chunk) = self.content_chunks.next() {
2035 return Some(chunk);
2036 }
2037
2038 if self.footer_height > 0 {
2039 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2040 self.footer_height = 0;
2041 return Some(Chunk {
2042 text,
2043 ..Default::default()
2044 });
2045 }
2046
2047 None
2048 }
2049}
2050
2051impl ToOffset for Point {
2052 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2053 snapshot.point_to_offset(*self)
2054 }
2055}
2056
2057impl ToOffset for PointUtf16 {
2058 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2059 snapshot.point_utf16_to_offset(*self)
2060 }
2061}
2062
2063impl ToOffset for usize {
2064 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2065 assert!(*self <= snapshot.len(), "offset is out of range");
2066 *self
2067 }
2068}
2069
2070impl ToPoint for usize {
2071 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2072 snapshot.offset_to_point(*self)
2073 }
2074}
2075
2076impl ToPoint for Point {
2077 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2078 *self
2079 }
2080}
2081
2082#[cfg(test)]
2083mod tests {
2084 use super::*;
2085 use gpui::MutableAppContext;
2086 use language::{Buffer, Rope};
2087 use rand::prelude::*;
2088 use std::env;
2089 use text::{Point, RandomCharIter};
2090 use util::test::sample_text;
2091
2092 #[gpui::test]
2093 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2094 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2095 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2096
2097 let snapshot = multibuffer.read(cx).snapshot(cx);
2098 assert_eq!(snapshot.text(), buffer.read(cx).text());
2099
2100 assert_eq!(
2101 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2102 (0..buffer.read(cx).row_count())
2103 .map(Some)
2104 .collect::<Vec<_>>()
2105 );
2106
2107 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2108 let snapshot = multibuffer.read(cx).snapshot(cx);
2109
2110 assert_eq!(snapshot.text(), buffer.read(cx).text());
2111 assert_eq!(
2112 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2113 (0..buffer.read(cx).row_count())
2114 .map(Some)
2115 .collect::<Vec<_>>()
2116 );
2117 }
2118
2119 #[gpui::test]
2120 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2121 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2122 let guest_buffer = cx.add_model(|cx| {
2123 let message = host_buffer.read(cx).to_proto();
2124 Buffer::from_proto(1, message, None, cx).unwrap()
2125 });
2126 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2127 let snapshot = multibuffer.read(cx).snapshot(cx);
2128 assert_eq!(snapshot.text(), "a");
2129
2130 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2131 let snapshot = multibuffer.read(cx).snapshot(cx);
2132 assert_eq!(snapshot.text(), "ab");
2133
2134 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2135 let snapshot = multibuffer.read(cx).snapshot(cx);
2136 assert_eq!(snapshot.text(), "abc");
2137 }
2138
2139 #[gpui::test]
2140 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2141 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2142 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2143 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2144
2145 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2146 let subscription = multibuffer.subscribe();
2147 multibuffer.push_excerpt(
2148 ExcerptProperties {
2149 buffer: &buffer_1,
2150 range: Point::new(1, 2)..Point::new(2, 5),
2151 },
2152 cx,
2153 );
2154 assert_eq!(
2155 subscription.consume().into_inner(),
2156 [Edit {
2157 old: 0..0,
2158 new: 0..10
2159 }]
2160 );
2161
2162 multibuffer.push_excerpt(
2163 ExcerptProperties {
2164 buffer: &buffer_1,
2165 range: Point::new(3, 3)..Point::new(4, 4),
2166 },
2167 cx,
2168 );
2169 multibuffer.push_excerpt(
2170 ExcerptProperties {
2171 buffer: &buffer_2,
2172 range: Point::new(3, 1)..Point::new(3, 3),
2173 },
2174 cx,
2175 );
2176 assert_eq!(
2177 subscription.consume().into_inner(),
2178 [Edit {
2179 old: 10..10,
2180 new: 10..22
2181 }]
2182 );
2183
2184 subscription
2185 });
2186
2187 let snapshot = multibuffer.read(cx).snapshot(cx);
2188 assert_eq!(
2189 snapshot.text(),
2190 concat!(
2191 "bbbb\n", // Preserve newlines
2192 "ccccc\n", //
2193 "ddd\n", //
2194 "eeee\n", //
2195 "jj" //
2196 )
2197 );
2198 assert_eq!(
2199 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2200 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2201 );
2202 assert_eq!(
2203 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2204 [Some(3), Some(4), Some(3)]
2205 );
2206 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2207 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2208 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2209 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2210 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2211 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2212 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2213 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2214
2215 buffer_1.update(cx, |buffer, cx| {
2216 buffer.edit(
2217 [
2218 Point::new(0, 0)..Point::new(0, 0),
2219 Point::new(2, 1)..Point::new(2, 3),
2220 ],
2221 "\n",
2222 cx,
2223 );
2224 });
2225
2226 let snapshot = multibuffer.read(cx).snapshot(cx);
2227 assert_eq!(
2228 snapshot.text(),
2229 concat!(
2230 "bbbb\n", // Preserve newlines
2231 "c\n", //
2232 "cc\n", //
2233 "ddd\n", //
2234 "eeee\n", //
2235 "jj" //
2236 )
2237 );
2238
2239 assert_eq!(
2240 subscription.consume().into_inner(),
2241 [Edit {
2242 old: 6..8,
2243 new: 6..7
2244 }]
2245 );
2246
2247 let snapshot = multibuffer.read(cx).snapshot(cx);
2248 assert_eq!(
2249 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2250 Point::new(0, 4)
2251 );
2252 assert_eq!(
2253 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2254 Point::new(0, 4)
2255 );
2256 assert_eq!(
2257 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2258 Point::new(5, 1)
2259 );
2260 assert_eq!(
2261 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2262 Point::new(5, 2)
2263 );
2264 assert_eq!(
2265 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2266 Point::new(5, 2)
2267 );
2268
2269 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2270 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2271 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2272 multibuffer.snapshot(cx)
2273 });
2274
2275 assert_eq!(
2276 snapshot.text(),
2277 concat!(
2278 "bbbb\n", // Preserve newlines
2279 "c\n", //
2280 "cc\n", //
2281 "ddd\n", //
2282 "eeee", //
2283 )
2284 );
2285 }
2286
2287 #[gpui::test]
2288 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2289 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2290
2291 let snapshot = multibuffer.read(cx).snapshot(cx);
2292 assert_eq!(snapshot.text(), "");
2293 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2294 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2295 }
2296
2297 #[gpui::test]
2298 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2299 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2300 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2301 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2302 buffer.update(cx, |buffer, cx| {
2303 buffer.edit([0..0], "X", cx);
2304 buffer.edit([5..5], "Y", cx);
2305 });
2306 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2307
2308 assert_eq!(old_snapshot.text(), "abcd");
2309 assert_eq!(new_snapshot.text(), "XabcdY");
2310
2311 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2312 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2313 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2314 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2315 }
2316
2317 #[gpui::test]
2318 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2319 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2320 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2321 let multibuffer = cx.add_model(|cx| {
2322 let mut multibuffer = MultiBuffer::new(0);
2323 multibuffer.push_excerpt(
2324 ExcerptProperties {
2325 buffer: &buffer_1,
2326 range: 0..4,
2327 },
2328 cx,
2329 );
2330 multibuffer.push_excerpt(
2331 ExcerptProperties {
2332 buffer: &buffer_2,
2333 range: 0..5,
2334 },
2335 cx,
2336 );
2337 multibuffer
2338 });
2339 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2340
2341 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2342 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2343 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2344 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2345 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2346 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2347
2348 buffer_1.update(cx, |buffer, cx| {
2349 buffer.edit([0..0], "W", cx);
2350 buffer.edit([5..5], "X", cx);
2351 });
2352 buffer_2.update(cx, |buffer, cx| {
2353 buffer.edit([0..0], "Y", cx);
2354 buffer.edit([6..0], "Z", cx);
2355 });
2356 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2357
2358 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2359 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2360
2361 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2362 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2363 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2364 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2365 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2366 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2367 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2368 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2369 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2370 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2371 }
2372
2373 #[gpui::test(iterations = 100)]
2374 fn test_random_excerpts(cx: &mut MutableAppContext, mut rng: StdRng) {
2375 let operations = env::var("OPERATIONS")
2376 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2377 .unwrap_or(10);
2378
2379 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2380 let list = cx.add_model(|_| MultiBuffer::new(0));
2381 let mut excerpt_ids = Vec::new();
2382 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2383 let mut old_versions = Vec::new();
2384
2385 for _ in 0..operations {
2386 match rng.gen_range(0..100) {
2387 0..=19 if !buffers.is_empty() => {
2388 let buffer = buffers.choose(&mut rng).unwrap();
2389 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
2390 }
2391 20..=29 if !expected_excerpts.is_empty() => {
2392 let mut ids_to_remove = vec![];
2393 for _ in 0..rng.gen_range(1..=3) {
2394 if expected_excerpts.is_empty() {
2395 break;
2396 }
2397
2398 let ix = rng.gen_range(0..expected_excerpts.len());
2399 ids_to_remove.push(excerpt_ids.remove(ix));
2400 let (buffer, range) = expected_excerpts.remove(ix);
2401 let buffer = buffer.read(cx);
2402 log::info!(
2403 "Removing excerpt {}: {:?}",
2404 ix,
2405 buffer
2406 .text_for_range(range.to_offset(&buffer))
2407 .collect::<String>(),
2408 );
2409 }
2410 ids_to_remove.sort_unstable();
2411 list.update(cx, |list, cx| list.remove_excerpts(&ids_to_remove, cx));
2412 }
2413 _ => {
2414 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
2415 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
2416 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
2417 buffers.last().unwrap()
2418 } else {
2419 buffers.choose(&mut rng).unwrap()
2420 };
2421
2422 let buffer = buffer_handle.read(cx);
2423 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
2424 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
2425 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
2426 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
2427 let prev_excerpt_id = excerpt_ids
2428 .get(prev_excerpt_ix)
2429 .cloned()
2430 .unwrap_or(ExcerptId::max());
2431 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
2432
2433 log::info!(
2434 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
2435 excerpt_ix,
2436 expected_excerpts.len(),
2437 buffer_handle.id(),
2438 buffer.text(),
2439 start_ix..end_ix,
2440 &buffer.text()[start_ix..end_ix]
2441 );
2442
2443 let excerpt_id = list.update(cx, |list, cx| {
2444 list.insert_excerpt_after(
2445 &prev_excerpt_id,
2446 ExcerptProperties {
2447 buffer: &buffer_handle,
2448 range: start_ix..end_ix,
2449 },
2450 cx,
2451 )
2452 });
2453
2454 excerpt_ids.insert(excerpt_ix, excerpt_id);
2455 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
2456 }
2457 }
2458
2459 if rng.gen_bool(0.3) {
2460 list.update(cx, |list, cx| {
2461 old_versions.push((list.snapshot(cx), list.subscribe()));
2462 })
2463 }
2464
2465 let snapshot = list.read(cx).snapshot(cx);
2466
2467 let mut excerpt_starts = Vec::new();
2468 let mut expected_text = String::new();
2469 let mut expected_buffer_rows = Vec::new();
2470 for (buffer, range) in &expected_excerpts {
2471 let buffer = buffer.read(cx);
2472 let buffer_range = range.to_offset(buffer);
2473
2474 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
2475 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
2476 expected_text.push('\n');
2477
2478 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
2479 ..=buffer.offset_to_point(buffer_range.end).row;
2480 for row in buffer_row_range {
2481 expected_buffer_rows.push(Some(row));
2482 }
2483 }
2484 // Remove final trailing newline.
2485 if !expected_excerpts.is_empty() {
2486 expected_text.pop();
2487 }
2488
2489 // Always report one buffer row
2490 if expected_buffer_rows.is_empty() {
2491 expected_buffer_rows.push(Some(0));
2492 }
2493
2494 assert_eq!(snapshot.text(), expected_text);
2495 log::info!("MultiBuffer text: {:?}", expected_text);
2496
2497 assert_eq!(
2498 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2499 expected_buffer_rows,
2500 );
2501
2502 for _ in 0..5 {
2503 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
2504 assert_eq!(
2505 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
2506 &expected_buffer_rows[start_row..],
2507 "buffer_rows({})",
2508 start_row
2509 );
2510 }
2511
2512 assert_eq!(
2513 snapshot.max_buffer_row(),
2514 expected_buffer_rows
2515 .into_iter()
2516 .filter_map(|r| r)
2517 .max()
2518 .unwrap()
2519 );
2520
2521 let mut excerpt_starts = excerpt_starts.into_iter();
2522 for (buffer, range) in &expected_excerpts {
2523 let buffer_id = buffer.id();
2524 let buffer = buffer.read(cx);
2525 let buffer_range = range.to_offset(buffer);
2526 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
2527 let buffer_start_point_utf16 =
2528 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
2529
2530 let excerpt_start = excerpt_starts.next().unwrap();
2531 let mut offset = excerpt_start.bytes;
2532 let mut buffer_offset = buffer_range.start;
2533 let mut point = excerpt_start.lines;
2534 let mut buffer_point = buffer_start_point;
2535 let mut point_utf16 = excerpt_start.lines_utf16;
2536 let mut buffer_point_utf16 = buffer_start_point_utf16;
2537 for ch in buffer
2538 .snapshot()
2539 .chunks(buffer_range.clone(), None)
2540 .flat_map(|c| c.text.chars())
2541 {
2542 for _ in 0..ch.len_utf8() {
2543 let left_offset = snapshot.clip_offset(offset, Bias::Left);
2544 let right_offset = snapshot.clip_offset(offset, Bias::Right);
2545 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
2546 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
2547 assert_eq!(
2548 left_offset,
2549 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
2550 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
2551 offset,
2552 buffer_id,
2553 buffer_offset,
2554 );
2555 assert_eq!(
2556 right_offset,
2557 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
2558 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
2559 offset,
2560 buffer_id,
2561 buffer_offset,
2562 );
2563
2564 let left_point = snapshot.clip_point(point, Bias::Left);
2565 let right_point = snapshot.clip_point(point, Bias::Right);
2566 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
2567 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
2568 assert_eq!(
2569 left_point,
2570 excerpt_start.lines + (buffer_left_point - buffer_start_point),
2571 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
2572 point,
2573 buffer_id,
2574 buffer_point,
2575 );
2576 assert_eq!(
2577 right_point,
2578 excerpt_start.lines + (buffer_right_point - buffer_start_point),
2579 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
2580 point,
2581 buffer_id,
2582 buffer_point,
2583 );
2584
2585 assert_eq!(
2586 snapshot.point_to_offset(left_point),
2587 left_offset,
2588 "point_to_offset({:?})",
2589 left_point,
2590 );
2591 assert_eq!(
2592 snapshot.offset_to_point(left_offset),
2593 left_point,
2594 "offset_to_point({:?})",
2595 left_offset,
2596 );
2597
2598 offset += 1;
2599 buffer_offset += 1;
2600 if ch == '\n' {
2601 point += Point::new(1, 0);
2602 buffer_point += Point::new(1, 0);
2603 } else {
2604 point += Point::new(0, 1);
2605 buffer_point += Point::new(0, 1);
2606 }
2607 }
2608
2609 for _ in 0..ch.len_utf16() {
2610 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
2611 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
2612 let buffer_left_point_utf16 =
2613 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
2614 let buffer_right_point_utf16 =
2615 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
2616 assert_eq!(
2617 left_point_utf16,
2618 excerpt_start.lines_utf16
2619 + (buffer_left_point_utf16 - buffer_start_point_utf16),
2620 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
2621 point_utf16,
2622 buffer_id,
2623 buffer_point_utf16,
2624 );
2625 assert_eq!(
2626 right_point_utf16,
2627 excerpt_start.lines_utf16
2628 + (buffer_right_point_utf16 - buffer_start_point_utf16),
2629 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
2630 point_utf16,
2631 buffer_id,
2632 buffer_point_utf16,
2633 );
2634
2635 if ch == '\n' {
2636 point_utf16 += PointUtf16::new(1, 0);
2637 buffer_point_utf16 += PointUtf16::new(1, 0);
2638 } else {
2639 point_utf16 += PointUtf16::new(0, 1);
2640 buffer_point_utf16 += PointUtf16::new(0, 1);
2641 }
2642 }
2643 }
2644 }
2645
2646 for (row, line) in expected_text.split('\n').enumerate() {
2647 assert_eq!(
2648 snapshot.line_len(row as u32),
2649 line.len() as u32,
2650 "line_len({}).",
2651 row
2652 );
2653 }
2654
2655 let text_rope = Rope::from(expected_text.as_str());
2656 for _ in 0..10 {
2657 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
2658 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
2659
2660 assert_eq!(
2661 snapshot
2662 .text_for_range(start_ix..end_ix)
2663 .collect::<String>(),
2664 &expected_text[start_ix..end_ix],
2665 "incorrect text for range {:?}",
2666 start_ix..end_ix
2667 );
2668
2669 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
2670 assert_eq!(
2671 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
2672 expected_summary,
2673 "incorrect summary for range {:?}",
2674 start_ix..end_ix
2675 );
2676 }
2677
2678 for _ in 0..10 {
2679 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
2680 assert_eq!(
2681 snapshot.reversed_chars_at(end_ix).collect::<String>(),
2682 expected_text[..end_ix].chars().rev().collect::<String>(),
2683 );
2684 }
2685
2686 for _ in 0..10 {
2687 let end_ix = rng.gen_range(0..=text_rope.len());
2688 let start_ix = rng.gen_range(0..=end_ix);
2689 assert_eq!(
2690 snapshot
2691 .bytes_in_range(start_ix..end_ix)
2692 .flatten()
2693 .copied()
2694 .collect::<Vec<_>>(),
2695 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
2696 "bytes_in_range({:?})",
2697 start_ix..end_ix,
2698 );
2699 }
2700 }
2701
2702 let snapshot = list.read(cx).snapshot(cx);
2703 for (old_snapshot, subscription) in old_versions {
2704 let edits = subscription.consume().into_inner();
2705
2706 log::info!(
2707 "applying subscription edits to old text: {:?}: {:?}",
2708 old_snapshot.text(),
2709 edits,
2710 );
2711
2712 let mut text = old_snapshot.text();
2713 for edit in edits {
2714 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
2715 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
2716 }
2717 assert_eq!(text.to_string(), snapshot.text());
2718 }
2719 }
2720
2721 #[gpui::test]
2722 fn test_history(cx: &mut MutableAppContext) {
2723 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
2724 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
2725 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2726 let group_interval = multibuffer.read(cx).history.group_interval;
2727 multibuffer.update(cx, |multibuffer, cx| {
2728 multibuffer.push_excerpt(
2729 ExcerptProperties {
2730 buffer: &buffer_1,
2731 range: 0..buffer_1.read(cx).len(),
2732 },
2733 cx,
2734 );
2735 multibuffer.push_excerpt(
2736 ExcerptProperties {
2737 buffer: &buffer_2,
2738 range: 0..buffer_2.read(cx).len(),
2739 },
2740 cx,
2741 );
2742 });
2743
2744 let mut now = Instant::now();
2745
2746 multibuffer.update(cx, |multibuffer, cx| {
2747 multibuffer.start_transaction_at(now, cx);
2748 multibuffer.edit(
2749 [
2750 Point::new(0, 0)..Point::new(0, 0),
2751 Point::new(1, 0)..Point::new(1, 0),
2752 ],
2753 "A",
2754 cx,
2755 );
2756 multibuffer.edit(
2757 [
2758 Point::new(0, 1)..Point::new(0, 1),
2759 Point::new(1, 1)..Point::new(1, 1),
2760 ],
2761 "B",
2762 cx,
2763 );
2764 multibuffer.end_transaction_at(now, cx);
2765 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
2766
2767 now += 2 * group_interval;
2768 multibuffer.start_transaction_at(now, cx);
2769 multibuffer.edit([2..2], "C", cx);
2770 multibuffer.end_transaction_at(now, cx);
2771 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
2772
2773 multibuffer.undo(cx);
2774 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
2775
2776 multibuffer.undo(cx);
2777 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
2778
2779 multibuffer.redo(cx);
2780 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
2781
2782 multibuffer.redo(cx);
2783 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
2784
2785 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
2786 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
2787
2788 multibuffer.undo(cx);
2789 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
2790
2791 multibuffer.redo(cx);
2792 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
2793
2794 multibuffer.redo(cx);
2795 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
2796
2797 multibuffer.undo(cx);
2798 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
2799
2800 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
2801 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
2802
2803 multibuffer.undo(cx);
2804 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
2805 });
2806 }
2807}