1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt};
4use anyhow::{anyhow, Result};
5use clock::ReplicaId;
6use collections::{HashMap, HashSet};
7use gpui::{AppContext, Entity, ModelContext, ModelHandle, Task};
8pub use language::Completion;
9use language::{
10 Buffer, BufferChunks, BufferSnapshot, Chunk, DiagnosticEntry, Event, File, Language, Outline,
11 OutlineItem, Selection, ToOffset as _, ToPoint as _, TransactionId,
12};
13use std::{
14 cell::{Ref, RefCell},
15 cmp, fmt, io,
16 iter::{self, FromIterator},
17 ops::{Range, Sub},
18 str,
19 sync::Arc,
20 time::{Duration, Instant},
21};
22use sum_tree::{Bias, Cursor, SumTree};
23use text::{
24 locator::Locator,
25 rope::TextDimension,
26 subscription::{Subscription, Topic},
27 AnchorRangeExt as _, Edit, Point, PointUtf16, TextSummary,
28};
29use theme::SyntaxTheme;
30use util::post_inc;
31
32const NEWLINES: &'static [u8] = &[b'\n'; u8::MAX as usize];
33
34pub type ExcerptId = Locator;
35
36pub struct MultiBuffer {
37 snapshot: RefCell<MultiBufferSnapshot>,
38 buffers: RefCell<HashMap<usize, BufferState>>,
39 subscriptions: Topic,
40 singleton: bool,
41 replica_id: ReplicaId,
42 history: History,
43}
44
45struct History {
46 next_transaction_id: usize,
47 undo_stack: Vec<Transaction>,
48 redo_stack: Vec<Transaction>,
49 transaction_depth: usize,
50 group_interval: Duration,
51}
52
53#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord, Debug)]
54pub enum CharKind {
55 Newline,
56 Punctuation,
57 Whitespace,
58 Word,
59}
60
61struct Transaction {
62 id: usize,
63 buffer_transactions: HashSet<(usize, text::TransactionId)>,
64 first_edit_at: Instant,
65 last_edit_at: Instant,
66}
67
68pub trait ToOffset: 'static + fmt::Debug {
69 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
70}
71
72pub trait ToPoint: 'static + fmt::Debug {
73 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
74}
75
76struct BufferState {
77 buffer: ModelHandle<Buffer>,
78 last_version: clock::Global,
79 last_parse_count: usize,
80 last_selections_update_count: usize,
81 last_diagnostics_update_count: usize,
82 excerpts: Vec<ExcerptId>,
83 _subscriptions: [gpui::Subscription; 2],
84}
85
86#[derive(Clone, Default)]
87pub struct MultiBufferSnapshot {
88 singleton: bool,
89 excerpts: SumTree<Excerpt>,
90 parse_count: usize,
91 diagnostics_update_count: usize,
92 is_dirty: bool,
93 has_conflict: bool,
94}
95
96pub struct ExcerptProperties<'a, T> {
97 pub buffer: &'a ModelHandle<Buffer>,
98 pub range: Range<T>,
99}
100
101#[derive(Clone)]
102struct Excerpt {
103 id: ExcerptId,
104 buffer_id: usize,
105 buffer: BufferSnapshot,
106 range: Range<text::Anchor>,
107 max_buffer_row: u32,
108 text_summary: TextSummary,
109 has_trailing_newline: bool,
110}
111
112#[derive(Clone, Debug, Default)]
113struct ExcerptSummary {
114 excerpt_id: ExcerptId,
115 max_buffer_row: u32,
116 text: TextSummary,
117}
118
119pub struct MultiBufferRows<'a> {
120 buffer_row_range: Range<u32>,
121 excerpts: Cursor<'a, Excerpt, Point>,
122}
123
124pub struct MultiBufferChunks<'a> {
125 range: Range<usize>,
126 excerpts: Cursor<'a, Excerpt, usize>,
127 excerpt_chunks: Option<ExcerptChunks<'a>>,
128 theme: Option<&'a SyntaxTheme>,
129}
130
131pub struct MultiBufferBytes<'a> {
132 range: Range<usize>,
133 excerpts: Cursor<'a, Excerpt, usize>,
134 excerpt_bytes: Option<ExcerptBytes<'a>>,
135 chunk: &'a [u8],
136}
137
138struct ExcerptChunks<'a> {
139 content_chunks: BufferChunks<'a>,
140 footer_height: usize,
141}
142
143struct ExcerptBytes<'a> {
144 content_bytes: language::rope::Bytes<'a>,
145 footer_height: usize,
146}
147
148impl MultiBuffer {
149 pub fn new(replica_id: ReplicaId) -> Self {
150 Self {
151 snapshot: Default::default(),
152 buffers: Default::default(),
153 subscriptions: Default::default(),
154 singleton: false,
155 replica_id,
156 history: History {
157 next_transaction_id: Default::default(),
158 undo_stack: Default::default(),
159 redo_stack: Default::default(),
160 transaction_depth: 0,
161 group_interval: Duration::from_millis(300),
162 },
163 }
164 }
165
166 pub fn singleton(buffer: ModelHandle<Buffer>, cx: &mut ModelContext<Self>) -> Self {
167 let mut this = Self::new(buffer.read(cx).replica_id());
168 this.singleton = true;
169 this.push_excerpt(
170 ExcerptProperties {
171 buffer: &buffer,
172 range: text::Anchor::min()..text::Anchor::max(),
173 },
174 cx,
175 );
176 this.snapshot.borrow_mut().singleton = true;
177 this
178 }
179
180 #[cfg(any(test, feature = "test-support"))]
181 pub fn build_simple(text: &str, cx: &mut gpui::MutableAppContext) -> ModelHandle<Self> {
182 let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
183 cx.add_model(|cx| Self::singleton(buffer, cx))
184 }
185
186 #[cfg(any(test, feature = "test-support"))]
187 pub fn build_random(
188 mut rng: &mut impl rand::Rng,
189 cx: &mut gpui::MutableAppContext,
190 ) -> ModelHandle<Self> {
191 use rand::prelude::*;
192 use std::env;
193 use text::RandomCharIter;
194
195 let max_excerpts = env::var("MAX_EXCERPTS")
196 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
197 .unwrap_or(5);
198 let excerpts = rng.gen_range(1..=max_excerpts);
199
200 cx.add_model(|cx| {
201 let mut multibuffer = MultiBuffer::new(0);
202 let mut buffers = Vec::new();
203 for _ in 0..excerpts {
204 let buffer_handle = if rng.gen() || buffers.is_empty() {
205 let text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
206 buffers.push(cx.add_model(|cx| Buffer::new(0, text, cx)));
207 let buffer = buffers.last().unwrap();
208 log::info!(
209 "Creating new buffer {} with text: {:?}",
210 buffer.id(),
211 buffer.read(cx).text()
212 );
213 buffers.last().unwrap()
214 } else {
215 buffers.choose(rng).unwrap()
216 };
217
218 let buffer = buffer_handle.read(cx);
219 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
220 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
221 let header_height = rng.gen_range(0..=5);
222 log::info!(
223 "Inserting excerpt from buffer {} with header height {} and range {:?}: {:?}",
224 buffer_handle.id(),
225 header_height,
226 start_ix..end_ix,
227 &buffer.text()[start_ix..end_ix]
228 );
229
230 multibuffer.push_excerpt(
231 ExcerptProperties {
232 buffer: buffer_handle,
233 range: start_ix..end_ix,
234 },
235 cx,
236 );
237 }
238 multibuffer
239 })
240 }
241
242 pub fn replica_id(&self) -> ReplicaId {
243 self.replica_id
244 }
245
246 pub fn snapshot(&self, cx: &AppContext) -> MultiBufferSnapshot {
247 self.sync(cx);
248 self.snapshot.borrow().clone()
249 }
250
251 pub fn read(&self, cx: &AppContext) -> Ref<MultiBufferSnapshot> {
252 self.sync(cx);
253 self.snapshot.borrow()
254 }
255
256 pub fn as_singleton(&self) -> Option<ModelHandle<Buffer>> {
257 if self.singleton {
258 return Some(
259 self.buffers
260 .borrow()
261 .values()
262 .next()
263 .unwrap()
264 .buffer
265 .clone(),
266 );
267 } else {
268 None
269 }
270 }
271
272 pub fn subscribe(&mut self) -> Subscription {
273 self.subscriptions.subscribe()
274 }
275
276 pub fn edit<I, S, T>(&mut self, ranges: I, new_text: T, cx: &mut ModelContext<Self>)
277 where
278 I: IntoIterator<Item = Range<S>>,
279 S: ToOffset,
280 T: Into<String>,
281 {
282 self.edit_internal(ranges, new_text, false, cx)
283 }
284
285 pub fn edit_with_autoindent<I, S, T>(
286 &mut self,
287 ranges: I,
288 new_text: T,
289 cx: &mut ModelContext<Self>,
290 ) where
291 I: IntoIterator<Item = Range<S>>,
292 S: ToOffset,
293 T: Into<String>,
294 {
295 self.edit_internal(ranges, new_text, true, cx)
296 }
297
298 pub fn edit_internal<I, S, T>(
299 &mut self,
300 ranges_iter: I,
301 new_text: T,
302 autoindent: bool,
303 cx: &mut ModelContext<Self>,
304 ) where
305 I: IntoIterator<Item = Range<S>>,
306 S: ToOffset,
307 T: Into<String>,
308 {
309 if let Some(buffer) = self.as_singleton() {
310 let snapshot = self.read(cx);
311 let ranges = ranges_iter
312 .into_iter()
313 .map(|range| range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot));
314 return buffer.update(cx, |buffer, cx| {
315 if autoindent {
316 buffer.edit_with_autoindent(ranges, new_text, cx)
317 } else {
318 buffer.edit(ranges, new_text, cx)
319 }
320 });
321 }
322
323 let snapshot = self.read(cx);
324 let mut buffer_edits: HashMap<usize, Vec<(Range<usize>, bool)>> = Default::default();
325 let mut cursor = snapshot.excerpts.cursor::<usize>();
326 for range in ranges_iter {
327 let start = range.start.to_offset(&snapshot);
328 let end = range.end.to_offset(&snapshot);
329 cursor.seek(&start, Bias::Right, &());
330 if cursor.item().is_none() && start == *cursor.start() {
331 cursor.prev(&());
332 }
333 let start_excerpt = cursor.item().expect("start offset out of bounds");
334 let start_overshoot = start - cursor.start();
335 let buffer_start =
336 start_excerpt.range.start.to_offset(&start_excerpt.buffer) + start_overshoot;
337
338 cursor.seek(&end, Bias::Right, &());
339 if cursor.item().is_none() && end == *cursor.start() {
340 cursor.prev(&());
341 }
342 let end_excerpt = cursor.item().expect("end offset out of bounds");
343 let end_overshoot = end - cursor.start();
344 let buffer_end = end_excerpt.range.start.to_offset(&end_excerpt.buffer) + end_overshoot;
345
346 if start_excerpt.id == end_excerpt.id {
347 buffer_edits
348 .entry(start_excerpt.buffer_id)
349 .or_insert(Vec::new())
350 .push((buffer_start..buffer_end, true));
351 } else {
352 let start_excerpt_range =
353 buffer_start..start_excerpt.range.end.to_offset(&start_excerpt.buffer);
354 let end_excerpt_range =
355 end_excerpt.range.start.to_offset(&end_excerpt.buffer)..buffer_end;
356 buffer_edits
357 .entry(start_excerpt.buffer_id)
358 .or_insert(Vec::new())
359 .push((start_excerpt_range, true));
360 buffer_edits
361 .entry(end_excerpt.buffer_id)
362 .or_insert(Vec::new())
363 .push((end_excerpt_range, false));
364
365 cursor.seek(&start, Bias::Right, &());
366 cursor.next(&());
367 while let Some(excerpt) = cursor.item() {
368 if excerpt.id == end_excerpt.id {
369 break;
370 }
371 buffer_edits
372 .entry(excerpt.buffer_id)
373 .or_insert(Vec::new())
374 .push((excerpt.range.to_offset(&excerpt.buffer), false));
375 cursor.next(&());
376 }
377 }
378 }
379
380 let new_text = new_text.into();
381 for (buffer_id, mut edits) in buffer_edits {
382 edits.sort_unstable_by_key(|(range, _)| range.start);
383 self.buffers.borrow()[&buffer_id]
384 .buffer
385 .update(cx, |buffer, cx| {
386 let mut edits = edits.into_iter().peekable();
387 let mut insertions = Vec::new();
388 let mut deletions = Vec::new();
389 while let Some((mut range, mut is_insertion)) = edits.next() {
390 while let Some((next_range, next_is_insertion)) = edits.peek() {
391 if range.end >= next_range.start {
392 range.end = cmp::max(next_range.end, range.end);
393 is_insertion |= *next_is_insertion;
394 edits.next();
395 } else {
396 break;
397 }
398 }
399
400 if is_insertion {
401 insertions.push(
402 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
403 );
404 } else if !range.is_empty() {
405 deletions.push(
406 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
407 );
408 }
409 }
410
411 if autoindent {
412 buffer.edit_with_autoindent(deletions, "", cx);
413 buffer.edit_with_autoindent(insertions, new_text.clone(), cx);
414 } else {
415 buffer.edit(deletions, "", cx);
416 buffer.edit(insertions, new_text.clone(), cx);
417 }
418 })
419 }
420 }
421
422 pub fn start_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
423 self.start_transaction_at(Instant::now(), cx)
424 }
425
426 pub(crate) fn start_transaction_at(
427 &mut self,
428 now: Instant,
429 cx: &mut ModelContext<Self>,
430 ) -> Option<TransactionId> {
431 if let Some(buffer) = self.as_singleton() {
432 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
433 }
434
435 for BufferState { buffer, .. } in self.buffers.borrow().values() {
436 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
437 }
438 self.history.start_transaction(now)
439 }
440
441 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
442 self.end_transaction_at(Instant::now(), cx)
443 }
444
445 pub(crate) fn end_transaction_at(
446 &mut self,
447 now: Instant,
448 cx: &mut ModelContext<Self>,
449 ) -> Option<TransactionId> {
450 if let Some(buffer) = self.as_singleton() {
451 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
452 }
453
454 let mut buffer_transactions = HashSet::default();
455 for BufferState { buffer, .. } in self.buffers.borrow().values() {
456 if let Some(transaction_id) =
457 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
458 {
459 buffer_transactions.insert((buffer.id(), transaction_id));
460 }
461 }
462
463 if self.history.end_transaction(now, buffer_transactions) {
464 let transaction_id = self.history.group().unwrap();
465 Some(transaction_id)
466 } else {
467 None
468 }
469 }
470
471 pub fn avoid_grouping_next_transaction(&mut self, cx: &mut ModelContext<Self>) {
472 for BufferState { buffer, .. } in self.buffers.borrow().values() {
473 buffer.update(cx, |buffer, _| buffer.avoid_grouping_next_transaction());
474 }
475 }
476
477 pub fn set_active_selections(
478 &mut self,
479 selections: &[Selection<Anchor>],
480 cx: &mut ModelContext<Self>,
481 ) {
482 let mut selections_by_buffer: HashMap<usize, Vec<Selection<text::Anchor>>> =
483 Default::default();
484 let snapshot = self.read(cx);
485 let mut cursor = snapshot.excerpts.cursor::<Option<&ExcerptId>>();
486 for selection in selections {
487 cursor.seek(&Some(&selection.start.excerpt_id), Bias::Left, &());
488 while let Some(excerpt) = cursor.item() {
489 if excerpt.id > selection.end.excerpt_id {
490 break;
491 }
492
493 let mut start = excerpt.range.start.clone();
494 let mut end = excerpt.range.end.clone();
495 if excerpt.id == selection.start.excerpt_id {
496 start = selection.start.text_anchor.clone();
497 }
498 if excerpt.id == selection.end.excerpt_id {
499 end = selection.end.text_anchor.clone();
500 }
501 selections_by_buffer
502 .entry(excerpt.buffer_id)
503 .or_default()
504 .push(Selection {
505 id: selection.id,
506 start,
507 end,
508 reversed: selection.reversed,
509 goal: selection.goal,
510 });
511
512 cursor.next(&());
513 }
514 }
515
516 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
517 if !selections_by_buffer.contains_key(buffer_id) {
518 buffer_state
519 .buffer
520 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
521 }
522 }
523
524 for (buffer_id, mut selections) in selections_by_buffer {
525 self.buffers.borrow()[&buffer_id]
526 .buffer
527 .update(cx, |buffer, cx| {
528 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer).unwrap());
529 let mut selections = selections.into_iter().peekable();
530 let merged_selections = Arc::from_iter(iter::from_fn(|| {
531 let mut selection = selections.next()?;
532 while let Some(next_selection) = selections.peek() {
533 if selection
534 .end
535 .cmp(&next_selection.start, buffer)
536 .unwrap()
537 .is_ge()
538 {
539 let next_selection = selections.next().unwrap();
540 if next_selection
541 .end
542 .cmp(&selection.end, buffer)
543 .unwrap()
544 .is_ge()
545 {
546 selection.end = next_selection.end;
547 }
548 } else {
549 break;
550 }
551 }
552 Some(selection)
553 }));
554 buffer.set_active_selections(merged_selections, cx);
555 });
556 }
557 }
558
559 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
560 for buffer in self.buffers.borrow().values() {
561 buffer
562 .buffer
563 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
564 }
565 }
566
567 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
568 if let Some(buffer) = self.as_singleton() {
569 return buffer.update(cx, |buffer, cx| buffer.undo(cx));
570 }
571
572 while let Some(transaction) = self.history.pop_undo() {
573 let mut undone = false;
574 for (buffer_id, buffer_transaction_id) in &transaction.buffer_transactions {
575 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(&buffer_id) {
576 undone |= buffer.update(cx, |buf, cx| {
577 buf.undo_transaction(*buffer_transaction_id, cx)
578 });
579 }
580 }
581
582 if undone {
583 return Some(transaction.id);
584 }
585 }
586
587 None
588 }
589
590 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
591 if let Some(buffer) = self.as_singleton() {
592 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
593 }
594
595 while let Some(transaction) = self.history.pop_redo() {
596 let mut redone = false;
597 for (buffer_id, buffer_transaction_id) in &transaction.buffer_transactions {
598 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(&buffer_id) {
599 redone |= buffer.update(cx, |buf, cx| {
600 buf.redo_transaction(*buffer_transaction_id, cx)
601 });
602 }
603 }
604
605 if redone {
606 return Some(transaction.id);
607 }
608 }
609
610 None
611 }
612
613 pub fn push_excerpt<O>(
614 &mut self,
615 props: ExcerptProperties<O>,
616 cx: &mut ModelContext<Self>,
617 ) -> ExcerptId
618 where
619 O: text::ToOffset,
620 {
621 self.insert_excerpt_after(&ExcerptId::max(), props, cx)
622 }
623
624 pub fn insert_excerpt_after<O>(
625 &mut self,
626 prev_excerpt_id: &ExcerptId,
627 props: ExcerptProperties<O>,
628 cx: &mut ModelContext<Self>,
629 ) -> ExcerptId
630 where
631 O: text::ToOffset,
632 {
633 assert_eq!(self.history.transaction_depth, 0);
634 self.sync(cx);
635
636 let buffer_snapshot = props.buffer.read(cx).snapshot();
637 let range = buffer_snapshot.anchor_before(&props.range.start)
638 ..buffer_snapshot.anchor_after(&props.range.end);
639 let mut snapshot = self.snapshot.borrow_mut();
640 let mut cursor = snapshot.excerpts.cursor::<Option<&ExcerptId>>();
641 let mut new_excerpts = cursor.slice(&Some(prev_excerpt_id), Bias::Right, &());
642
643 let mut prev_id = ExcerptId::min();
644 let edit_start = new_excerpts.summary().text.bytes;
645 new_excerpts.update_last(
646 |excerpt| {
647 excerpt.has_trailing_newline = true;
648 prev_id = excerpt.id.clone();
649 },
650 &(),
651 );
652
653 let mut next_id = ExcerptId::max();
654 if let Some(next_excerpt) = cursor.item() {
655 next_id = next_excerpt.id.clone();
656 }
657
658 let id = ExcerptId::between(&prev_id, &next_id);
659
660 let mut buffers = self.buffers.borrow_mut();
661 let buffer_state = buffers
662 .entry(props.buffer.id())
663 .or_insert_with(|| BufferState {
664 last_version: buffer_snapshot.version().clone(),
665 last_parse_count: buffer_snapshot.parse_count(),
666 last_selections_update_count: buffer_snapshot.selections_update_count(),
667 last_diagnostics_update_count: buffer_snapshot.diagnostics_update_count(),
668 excerpts: Default::default(),
669 _subscriptions: [
670 cx.observe(&props.buffer, |_, _, cx| cx.notify()),
671 cx.subscribe(&props.buffer, Self::on_buffer_event),
672 ],
673 buffer: props.buffer.clone(),
674 });
675 if let Err(ix) = buffer_state.excerpts.binary_search(&id) {
676 buffer_state.excerpts.insert(ix, id.clone());
677 }
678
679 let excerpt = Excerpt::new(
680 id.clone(),
681 props.buffer.id(),
682 buffer_snapshot,
683 range,
684 cursor.item().is_some(),
685 );
686 new_excerpts.push(excerpt, &());
687 let edit_end = new_excerpts.summary().text.bytes;
688
689 new_excerpts.push_tree(cursor.suffix(&()), &());
690 drop(cursor);
691 snapshot.excerpts = new_excerpts;
692
693 self.subscriptions.publish_mut([Edit {
694 old: edit_start..edit_start,
695 new: edit_start..edit_end,
696 }]);
697
698 cx.notify();
699 id
700 }
701
702 pub fn excerpt_ids_for_buffer(&self, buffer: &ModelHandle<Buffer>) -> Vec<ExcerptId> {
703 self.buffers
704 .borrow()
705 .get(&buffer.id())
706 .map_or(Vec::new(), |state| state.excerpts.clone())
707 }
708
709 pub fn excerpted_buffers<'a, T: ToOffset>(
710 &'a self,
711 range: Range<T>,
712 cx: &AppContext,
713 ) -> Vec<(ModelHandle<Buffer>, Range<usize>)> {
714 let snapshot = self.snapshot(cx);
715 let start = range.start.to_offset(&snapshot);
716 let end = range.end.to_offset(&snapshot);
717
718 let mut result = Vec::new();
719 let mut cursor = snapshot.excerpts.cursor::<usize>();
720 cursor.seek(&start, Bias::Right, &());
721 while let Some(excerpt) = cursor.item() {
722 if *cursor.start() > end {
723 break;
724 }
725
726 let mut end_before_newline = cursor.end(&());
727 if excerpt.has_trailing_newline {
728 end_before_newline -= 1;
729 }
730 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
731 let start = excerpt_start + (cmp::max(start, *cursor.start()) - *cursor.start());
732 let end = excerpt_start + (cmp::min(end, end_before_newline) - *cursor.start());
733 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
734 result.push((buffer, start..end));
735 cursor.next(&());
736 }
737
738 result
739 }
740
741 pub fn remove_excerpts<'a>(
742 &mut self,
743 excerpt_ids: impl IntoIterator<Item = &'a ExcerptId>,
744 cx: &mut ModelContext<Self>,
745 ) {
746 let mut buffers = self.buffers.borrow_mut();
747 let mut snapshot = self.snapshot.borrow_mut();
748 let mut new_excerpts = SumTree::new();
749 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
750 let mut edits = Vec::new();
751 let mut excerpt_ids = excerpt_ids.into_iter().peekable();
752
753 while let Some(mut excerpt_id) = excerpt_ids.next() {
754 // Seek to the next excerpt to remove, preserving any preceding excerpts.
755 new_excerpts.push_tree(cursor.slice(&Some(excerpt_id), Bias::Left, &()), &());
756 if let Some(mut excerpt) = cursor.item() {
757 if excerpt.id != *excerpt_id {
758 continue;
759 }
760 let mut old_start = cursor.start().1;
761
762 // Skip over the removed excerpt.
763 loop {
764 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
765 buffer_state.excerpts.retain(|id| id != excerpt_id);
766 if buffer_state.excerpts.is_empty() {
767 buffers.remove(&excerpt.buffer_id);
768 }
769 }
770 cursor.next(&());
771
772 // Skip over any subsequent excerpts that are also removed.
773 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
774 if let Some(next_excerpt) = cursor.item() {
775 if next_excerpt.id == *next_excerpt_id {
776 excerpt = next_excerpt;
777 excerpt_id = excerpt_ids.next().unwrap();
778 continue;
779 }
780 }
781 }
782
783 break;
784 }
785
786 // When removing the last excerpt, remove the trailing newline from
787 // the previous excerpt.
788 if cursor.item().is_none() && old_start > 0 {
789 old_start -= 1;
790 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
791 }
792
793 // Push an edit for the removal of this run of excerpts.
794 let old_end = cursor.start().1;
795 let new_start = new_excerpts.summary().text.bytes;
796 edits.push(Edit {
797 old: old_start..old_end,
798 new: new_start..new_start,
799 });
800 }
801 }
802 new_excerpts.push_tree(cursor.suffix(&()), &());
803 drop(cursor);
804 snapshot.excerpts = new_excerpts;
805 self.subscriptions.publish_mut(edits);
806 cx.notify();
807 }
808
809 pub fn text_anchor_for_position<'a, T: ToOffset>(
810 &'a self,
811 position: T,
812 cx: &AppContext,
813 ) -> (ModelHandle<Buffer>, language::Anchor) {
814 let snapshot = self.read(cx);
815 let anchor = snapshot.anchor_before(position);
816 (
817 self.buffers.borrow()[&anchor.buffer_id].buffer.clone(),
818 anchor.text_anchor,
819 )
820 }
821
822 fn on_buffer_event(
823 &mut self,
824 _: ModelHandle<Buffer>,
825 event: &Event,
826 cx: &mut ModelContext<Self>,
827 ) {
828 cx.emit(event.clone());
829 }
830
831 pub fn format(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
832 let mut format_tasks = Vec::new();
833 for BufferState { buffer, .. } in self.buffers.borrow().values() {
834 format_tasks.push(buffer.update(cx, |buffer, cx| buffer.format(cx)));
835 }
836
837 cx.spawn(|_, _| async move {
838 for format in format_tasks {
839 format.await?;
840 }
841 Ok(())
842 })
843 }
844
845 pub fn save(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
846 let mut save_tasks = Vec::new();
847 for BufferState { buffer, .. } in self.buffers.borrow().values() {
848 save_tasks.push(buffer.update(cx, |buffer, cx| buffer.save(cx)));
849 }
850
851 cx.spawn(|_, _| async move {
852 for save in save_tasks {
853 save.await?;
854 }
855 Ok(())
856 })
857 }
858
859 pub fn completions<T>(
860 &self,
861 position: T,
862 cx: &mut ModelContext<Self>,
863 ) -> Task<Result<Vec<Completion<Anchor>>>>
864 where
865 T: ToOffset,
866 {
867 let anchor = self.read(cx).anchor_before(position);
868 let buffer = self.buffers.borrow()[&anchor.buffer_id].buffer.clone();
869 let completions =
870 buffer.update(cx, |buffer, cx| buffer.completions(anchor.text_anchor, cx));
871 cx.spawn(|this, cx| async move {
872 completions.await.map(|completions| {
873 let snapshot = this.read_with(&cx, |buffer, cx| buffer.snapshot(cx));
874 completions
875 .into_iter()
876 .map(|completion| Completion {
877 old_range: snapshot.anchor_in_excerpt(
878 anchor.excerpt_id.clone(),
879 completion.old_range.start,
880 )
881 ..snapshot.anchor_in_excerpt(
882 anchor.excerpt_id.clone(),
883 completion.old_range.end,
884 ),
885 new_text: completion.new_text,
886 lsp_completion: completion.lsp_completion,
887 })
888 .collect()
889 })
890 })
891 }
892
893 pub fn is_completion_trigger<T>(&self, position: T, text: &str, cx: &AppContext) -> bool
894 where
895 T: ToOffset,
896 {
897 let mut chars = text.chars();
898 let char = if let Some(char) = chars.next() {
899 char
900 } else {
901 return false;
902 };
903 if chars.next().is_some() {
904 return false;
905 }
906
907 if char.is_alphanumeric() || char == '_' {
908 return true;
909 }
910
911 let snapshot = self.snapshot(cx);
912 let anchor = snapshot.anchor_before(position);
913 let buffer = self.buffers.borrow()[&anchor.buffer_id].buffer.clone();
914 if let Some(language_server) = buffer.read(cx).language_server() {
915 language_server
916 .capabilities()
917 .completion_provider
918 .as_ref()
919 .map_or(false, |provider| {
920 provider
921 .trigger_characters
922 .as_ref()
923 .map_or(false, |characters| {
924 characters.iter().any(|string| string == text)
925 })
926 })
927 } else {
928 false
929 }
930 }
931
932 pub fn apply_completion(
933 &self,
934 completion: Completion<Anchor>,
935 cx: &mut ModelContext<Self>,
936 ) -> Task<Result<()>> {
937 let buffer = if let Some(buffer) = self
938 .buffers
939 .borrow()
940 .get(&completion.old_range.start.buffer_id)
941 {
942 buffer.buffer.clone()
943 } else {
944 return Task::ready(Err(anyhow!("completion cannot be applied to any buffer")));
945 };
946
947 buffer.update(cx, |buffer, cx| {
948 buffer.apply_completion(
949 Completion {
950 old_range: completion.old_range.start.text_anchor
951 ..completion.old_range.end.text_anchor,
952 new_text: completion.new_text,
953 lsp_completion: completion.lsp_completion,
954 },
955 cx,
956 )
957 })
958 }
959
960 pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
961 self.buffers
962 .borrow()
963 .values()
964 .next()
965 .and_then(|state| state.buffer.read(cx).language())
966 }
967
968 pub fn file<'a>(&self, cx: &'a AppContext) -> Option<&'a dyn File> {
969 self.as_singleton()?.read(cx).file()
970 }
971
972 #[cfg(test)]
973 pub fn is_parsing(&self, cx: &AppContext) -> bool {
974 self.as_singleton().unwrap().read(cx).is_parsing()
975 }
976
977 fn sync(&self, cx: &AppContext) {
978 let mut snapshot = self.snapshot.borrow_mut();
979 let mut excerpts_to_edit = Vec::new();
980 let mut reparsed = false;
981 let mut diagnostics_updated = false;
982 let mut is_dirty = false;
983 let mut has_conflict = false;
984 let mut buffers = self.buffers.borrow_mut();
985 for buffer_state in buffers.values_mut() {
986 let buffer = buffer_state.buffer.read(cx);
987 let version = buffer.version();
988 let parse_count = buffer.parse_count();
989 let selections_update_count = buffer.selections_update_count();
990 let diagnostics_update_count = buffer.diagnostics_update_count();
991
992 let buffer_edited = version.changed_since(&buffer_state.last_version);
993 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
994 let buffer_selections_updated =
995 selections_update_count > buffer_state.last_selections_update_count;
996 let buffer_diagnostics_updated =
997 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
998 if buffer_edited
999 || buffer_reparsed
1000 || buffer_selections_updated
1001 || buffer_diagnostics_updated
1002 {
1003 buffer_state.last_version = version;
1004 buffer_state.last_parse_count = parse_count;
1005 buffer_state.last_selections_update_count = selections_update_count;
1006 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
1007 excerpts_to_edit.extend(
1008 buffer_state
1009 .excerpts
1010 .iter()
1011 .map(|excerpt_id| (excerpt_id, buffer_state.buffer.clone(), buffer_edited)),
1012 );
1013 }
1014
1015 reparsed |= buffer_reparsed;
1016 diagnostics_updated |= buffer_diagnostics_updated;
1017 is_dirty |= buffer.is_dirty();
1018 has_conflict |= buffer.has_conflict();
1019 }
1020 if reparsed {
1021 snapshot.parse_count += 1;
1022 }
1023 if diagnostics_updated {
1024 snapshot.diagnostics_update_count += 1;
1025 }
1026 snapshot.is_dirty = is_dirty;
1027 snapshot.has_conflict = has_conflict;
1028
1029 excerpts_to_edit.sort_unstable_by_key(|(excerpt_id, _, _)| *excerpt_id);
1030
1031 let mut edits = Vec::new();
1032 let mut new_excerpts = SumTree::new();
1033 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
1034
1035 for (id, buffer, buffer_edited) in excerpts_to_edit {
1036 new_excerpts.push_tree(cursor.slice(&Some(id), Bias::Left, &()), &());
1037 let old_excerpt = cursor.item().unwrap();
1038 let buffer_id = buffer.id();
1039 let buffer = buffer.read(cx);
1040
1041 let mut new_excerpt;
1042 if buffer_edited {
1043 edits.extend(
1044 buffer
1045 .edits_since_in_range::<usize>(
1046 old_excerpt.buffer.version(),
1047 old_excerpt.range.clone(),
1048 )
1049 .map(|mut edit| {
1050 let excerpt_old_start = cursor.start().1;
1051 let excerpt_new_start = new_excerpts.summary().text.bytes;
1052 edit.old.start += excerpt_old_start;
1053 edit.old.end += excerpt_old_start;
1054 edit.new.start += excerpt_new_start;
1055 edit.new.end += excerpt_new_start;
1056 edit
1057 }),
1058 );
1059
1060 new_excerpt = Excerpt::new(
1061 id.clone(),
1062 buffer_id,
1063 buffer.snapshot(),
1064 old_excerpt.range.clone(),
1065 old_excerpt.has_trailing_newline,
1066 );
1067 } else {
1068 new_excerpt = old_excerpt.clone();
1069 new_excerpt.buffer = buffer.snapshot();
1070 }
1071
1072 new_excerpts.push(new_excerpt, &());
1073 cursor.next(&());
1074 }
1075 new_excerpts.push_tree(cursor.suffix(&()), &());
1076
1077 drop(cursor);
1078 snapshot.excerpts = new_excerpts;
1079
1080 self.subscriptions.publish(edits);
1081 }
1082}
1083
1084#[cfg(any(test, feature = "test-support"))]
1085impl MultiBuffer {
1086 pub fn randomly_edit(
1087 &mut self,
1088 rng: &mut impl rand::Rng,
1089 count: usize,
1090 cx: &mut ModelContext<Self>,
1091 ) {
1092 use text::RandomCharIter;
1093
1094 let snapshot = self.read(cx);
1095 let mut old_ranges: Vec<Range<usize>> = Vec::new();
1096 for _ in 0..count {
1097 let last_end = old_ranges.last().map_or(0, |last_range| last_range.end + 1);
1098 if last_end > snapshot.len() {
1099 break;
1100 }
1101 let end_ix = snapshot.clip_offset(rng.gen_range(0..=last_end), Bias::Right);
1102 let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1103 old_ranges.push(start_ix..end_ix);
1104 }
1105 let new_text_len = rng.gen_range(0..10);
1106 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1107 log::info!("mutating multi-buffer at {:?}: {:?}", old_ranges, new_text);
1108 drop(snapshot);
1109
1110 self.edit(old_ranges.iter().cloned(), new_text.as_str(), cx);
1111 }
1112}
1113
1114impl Entity for MultiBuffer {
1115 type Event = language::Event;
1116}
1117
1118impl MultiBufferSnapshot {
1119 pub fn text(&self) -> String {
1120 self.chunks(0..self.len(), None)
1121 .map(|chunk| chunk.text)
1122 .collect()
1123 }
1124
1125 pub fn reversed_chars_at<'a, T: ToOffset>(
1126 &'a self,
1127 position: T,
1128 ) -> impl Iterator<Item = char> + 'a {
1129 let mut offset = position.to_offset(self);
1130 let mut cursor = self.excerpts.cursor::<usize>();
1131 cursor.seek(&offset, Bias::Left, &());
1132 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1133 let end_before_footer = cursor.start() + excerpt.text_summary.bytes;
1134 let start = excerpt.range.start.to_offset(&excerpt.buffer);
1135 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1136 excerpt.buffer.reversed_chunks_in_range(start..end)
1137 });
1138 iter::from_fn(move || {
1139 if offset == *cursor.start() {
1140 cursor.prev(&());
1141 let excerpt = cursor.item()?;
1142 excerpt_chunks = Some(
1143 excerpt
1144 .buffer
1145 .reversed_chunks_in_range(excerpt.range.clone()),
1146 );
1147 }
1148
1149 let excerpt = cursor.item().unwrap();
1150 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1151 offset -= 1;
1152 Some("\n")
1153 } else {
1154 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1155 offset -= chunk.len();
1156 Some(chunk)
1157 }
1158 })
1159 .flat_map(|c| c.chars().rev())
1160 }
1161
1162 pub fn chars_at<'a, T: ToOffset>(&'a self, position: T) -> impl Iterator<Item = char> + 'a {
1163 let offset = position.to_offset(self);
1164 self.text_for_range(offset..self.len())
1165 .flat_map(|chunk| chunk.chars())
1166 }
1167
1168 pub fn text_for_range<'a, T: ToOffset>(
1169 &'a self,
1170 range: Range<T>,
1171 ) -> impl Iterator<Item = &'a str> {
1172 self.chunks(range, None).map(|chunk| chunk.text)
1173 }
1174
1175 pub fn is_line_blank(&self, row: u32) -> bool {
1176 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1177 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1178 }
1179
1180 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1181 where
1182 T: ToOffset,
1183 {
1184 let position = position.to_offset(self);
1185 position == self.clip_offset(position, Bias::Left)
1186 && self
1187 .bytes_in_range(position..self.len())
1188 .flatten()
1189 .copied()
1190 .take(needle.len())
1191 .eq(needle.bytes())
1192 }
1193
1194 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
1195 let mut start = start.to_offset(self);
1196 let mut end = start;
1197 let mut next_chars = self.chars_at(start).peekable();
1198 let mut prev_chars = self.reversed_chars_at(start).peekable();
1199 let word_kind = cmp::max(
1200 prev_chars.peek().copied().map(char_kind),
1201 next_chars.peek().copied().map(char_kind),
1202 );
1203
1204 for ch in prev_chars {
1205 if Some(char_kind(ch)) == word_kind {
1206 start -= ch.len_utf8();
1207 } else {
1208 break;
1209 }
1210 }
1211
1212 for ch in next_chars {
1213 if Some(char_kind(ch)) == word_kind {
1214 end += ch.len_utf8();
1215 } else {
1216 break;
1217 }
1218 }
1219
1220 (start..end, word_kind)
1221 }
1222
1223 fn as_singleton(&self) -> Option<&Excerpt> {
1224 if self.singleton {
1225 self.excerpts.iter().next()
1226 } else {
1227 None
1228 }
1229 }
1230
1231 pub fn len(&self) -> usize {
1232 self.excerpts.summary().text.bytes
1233 }
1234
1235 pub fn max_buffer_row(&self) -> u32 {
1236 self.excerpts.summary().max_buffer_row
1237 }
1238
1239 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1240 if let Some(excerpt) = self.as_singleton() {
1241 return excerpt.buffer.clip_offset(offset, bias);
1242 }
1243
1244 let mut cursor = self.excerpts.cursor::<usize>();
1245 cursor.seek(&offset, Bias::Right, &());
1246 let overshoot = if let Some(excerpt) = cursor.item() {
1247 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1248 let buffer_offset = excerpt
1249 .buffer
1250 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1251 buffer_offset.saturating_sub(excerpt_start)
1252 } else {
1253 0
1254 };
1255 cursor.start() + overshoot
1256 }
1257
1258 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1259 if let Some(excerpt) = self.as_singleton() {
1260 return excerpt.buffer.clip_point(point, bias);
1261 }
1262
1263 let mut cursor = self.excerpts.cursor::<Point>();
1264 cursor.seek(&point, Bias::Right, &());
1265 let overshoot = if let Some(excerpt) = cursor.item() {
1266 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1267 let buffer_point = excerpt
1268 .buffer
1269 .clip_point(excerpt_start + (point - cursor.start()), bias);
1270 buffer_point.saturating_sub(excerpt_start)
1271 } else {
1272 Point::zero()
1273 };
1274 *cursor.start() + overshoot
1275 }
1276
1277 pub fn clip_point_utf16(&self, point: PointUtf16, bias: Bias) -> PointUtf16 {
1278 if let Some(excerpt) = self.as_singleton() {
1279 return excerpt.buffer.clip_point_utf16(point, bias);
1280 }
1281
1282 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1283 cursor.seek(&point, Bias::Right, &());
1284 let overshoot = if let Some(excerpt) = cursor.item() {
1285 let excerpt_start = excerpt
1286 .buffer
1287 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1288 let buffer_point = excerpt
1289 .buffer
1290 .clip_point_utf16(excerpt_start + (point - cursor.start()), bias);
1291 buffer_point.saturating_sub(excerpt_start)
1292 } else {
1293 PointUtf16::zero()
1294 };
1295 *cursor.start() + overshoot
1296 }
1297
1298 pub fn bytes_in_range<'a, T: ToOffset>(&'a self, range: Range<T>) -> MultiBufferBytes<'a> {
1299 let range = range.start.to_offset(self)..range.end.to_offset(self);
1300 let mut excerpts = self.excerpts.cursor::<usize>();
1301 excerpts.seek(&range.start, Bias::Right, &());
1302
1303 let mut chunk = &[][..];
1304 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1305 let mut excerpt_bytes = excerpt
1306 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1307 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1308 Some(excerpt_bytes)
1309 } else {
1310 None
1311 };
1312
1313 MultiBufferBytes {
1314 range,
1315 excerpts,
1316 excerpt_bytes,
1317 chunk,
1318 }
1319 }
1320
1321 pub fn buffer_rows<'a>(&'a self, start_row: u32) -> MultiBufferRows<'a> {
1322 let mut result = MultiBufferRows {
1323 buffer_row_range: 0..0,
1324 excerpts: self.excerpts.cursor(),
1325 };
1326 result.seek(start_row);
1327 result
1328 }
1329
1330 pub fn chunks<'a, T: ToOffset>(
1331 &'a self,
1332 range: Range<T>,
1333 theme: Option<&'a SyntaxTheme>,
1334 ) -> MultiBufferChunks<'a> {
1335 let range = range.start.to_offset(self)..range.end.to_offset(self);
1336 let mut chunks = MultiBufferChunks {
1337 range: range.clone(),
1338 excerpts: self.excerpts.cursor(),
1339 excerpt_chunks: None,
1340 theme,
1341 };
1342 chunks.seek(range.start);
1343 chunks
1344 }
1345
1346 pub fn offset_to_point(&self, offset: usize) -> Point {
1347 if let Some(excerpt) = self.as_singleton() {
1348 return excerpt.buffer.offset_to_point(offset);
1349 }
1350
1351 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1352 cursor.seek(&offset, Bias::Right, &());
1353 if let Some(excerpt) = cursor.item() {
1354 let (start_offset, start_point) = cursor.start();
1355 let overshoot = offset - start_offset;
1356 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1357 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1358 let buffer_point = excerpt
1359 .buffer
1360 .offset_to_point(excerpt_start_offset + overshoot);
1361 *start_point + (buffer_point - excerpt_start_point)
1362 } else {
1363 self.excerpts.summary().text.lines
1364 }
1365 }
1366
1367 pub fn point_to_offset(&self, point: Point) -> usize {
1368 if let Some(excerpt) = self.as_singleton() {
1369 return excerpt.buffer.point_to_offset(point);
1370 }
1371
1372 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1373 cursor.seek(&point, Bias::Right, &());
1374 if let Some(excerpt) = cursor.item() {
1375 let (start_point, start_offset) = cursor.start();
1376 let overshoot = point - start_point;
1377 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1378 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1379 let buffer_offset = excerpt
1380 .buffer
1381 .point_to_offset(excerpt_start_point + overshoot);
1382 *start_offset + buffer_offset - excerpt_start_offset
1383 } else {
1384 self.excerpts.summary().text.bytes
1385 }
1386 }
1387
1388 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1389 if let Some(excerpt) = self.as_singleton() {
1390 return excerpt.buffer.point_utf16_to_offset(point);
1391 }
1392
1393 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1394 cursor.seek(&point, Bias::Right, &());
1395 if let Some(excerpt) = cursor.item() {
1396 let (start_point, start_offset) = cursor.start();
1397 let overshoot = point - start_point;
1398 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1399 let excerpt_start_point = excerpt
1400 .buffer
1401 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1402 let buffer_offset = excerpt
1403 .buffer
1404 .point_utf16_to_offset(excerpt_start_point + overshoot);
1405 *start_offset + (buffer_offset - excerpt_start_offset)
1406 } else {
1407 self.excerpts.summary().text.bytes
1408 }
1409 }
1410
1411 pub fn indent_column_for_line(&self, row: u32) -> u32 {
1412 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
1413 buffer
1414 .indent_column_for_line(range.start.row)
1415 .min(range.end.column)
1416 .saturating_sub(range.start.column)
1417 } else {
1418 0
1419 }
1420 }
1421
1422 pub fn line_len(&self, row: u32) -> u32 {
1423 if let Some((_, range)) = self.buffer_line_for_row(row) {
1424 range.end.column - range.start.column
1425 } else {
1426 0
1427 }
1428 }
1429
1430 fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
1431 let mut cursor = self.excerpts.cursor::<Point>();
1432 cursor.seek(&Point::new(row, 0), Bias::Right, &());
1433 if let Some(excerpt) = cursor.item() {
1434 let overshoot = row - cursor.start().row;
1435 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1436 let excerpt_end = excerpt.range.end.to_point(&excerpt.buffer);
1437 let buffer_row = excerpt_start.row + overshoot;
1438 let line_start = Point::new(buffer_row, 0);
1439 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
1440 return Some((
1441 &excerpt.buffer,
1442 line_start.max(excerpt_start)..line_end.min(excerpt_end),
1443 ));
1444 }
1445 None
1446 }
1447
1448 pub fn max_point(&self) -> Point {
1449 self.text_summary().lines
1450 }
1451
1452 pub fn text_summary(&self) -> TextSummary {
1453 self.excerpts.summary().text
1454 }
1455
1456 pub fn text_summary_for_range<'a, D, O>(&'a self, range: Range<O>) -> D
1457 where
1458 D: TextDimension,
1459 O: ToOffset,
1460 {
1461 let mut summary = D::default();
1462 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1463 let mut cursor = self.excerpts.cursor::<usize>();
1464 cursor.seek(&range.start, Bias::Right, &());
1465 if let Some(excerpt) = cursor.item() {
1466 let mut end_before_newline = cursor.end(&());
1467 if excerpt.has_trailing_newline {
1468 end_before_newline -= 1;
1469 }
1470
1471 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1472 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
1473 let end_in_excerpt =
1474 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
1475 summary.add_assign(
1476 &excerpt
1477 .buffer
1478 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
1479 );
1480
1481 if range.end > end_before_newline {
1482 summary.add_assign(&D::from_text_summary(&TextSummary {
1483 bytes: 1,
1484 lines: Point::new(1 as u32, 0),
1485 lines_utf16: PointUtf16::new(1 as u32, 0),
1486 first_line_chars: 0,
1487 last_line_chars: 0,
1488 longest_row: 0,
1489 longest_row_chars: 0,
1490 }));
1491 }
1492
1493 cursor.next(&());
1494 }
1495
1496 if range.end > *cursor.start() {
1497 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
1498 &range.end,
1499 Bias::Right,
1500 &(),
1501 )));
1502 if let Some(excerpt) = cursor.item() {
1503 range.end = cmp::max(*cursor.start(), range.end);
1504
1505 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1506 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
1507 summary.add_assign(
1508 &excerpt
1509 .buffer
1510 .text_summary_for_range(excerpt_start..end_in_excerpt),
1511 );
1512 }
1513 }
1514
1515 summary
1516 }
1517
1518 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
1519 where
1520 D: TextDimension + Ord + Sub<D, Output = D>,
1521 {
1522 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1523 cursor.seek(&Some(&anchor.excerpt_id), Bias::Left, &());
1524 if cursor.item().is_none() {
1525 cursor.next(&());
1526 }
1527
1528 let mut position = D::from_text_summary(&cursor.start().text);
1529 if let Some(excerpt) = cursor.item() {
1530 if excerpt.id == anchor.excerpt_id && excerpt.buffer_id == anchor.buffer_id {
1531 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1532 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1533 let buffer_position = cmp::min(
1534 excerpt_buffer_end,
1535 anchor.text_anchor.summary::<D>(&excerpt.buffer),
1536 );
1537 if buffer_position > excerpt_buffer_start {
1538 position.add_assign(&(buffer_position - excerpt_buffer_start));
1539 }
1540 }
1541 }
1542 position
1543 }
1544
1545 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
1546 where
1547 D: TextDimension + Ord + Sub<D, Output = D>,
1548 I: 'a + IntoIterator<Item = &'a Anchor>,
1549 {
1550 let mut anchors = anchors.into_iter().peekable();
1551 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1552 let mut summaries = Vec::new();
1553 while let Some(anchor) = anchors.peek() {
1554 let excerpt_id = &anchor.excerpt_id;
1555 let buffer_id = anchor.buffer_id;
1556 let excerpt_anchors = iter::from_fn(|| {
1557 let anchor = anchors.peek()?;
1558 if anchor.excerpt_id == *excerpt_id && anchor.buffer_id == buffer_id {
1559 Some(&anchors.next().unwrap().text_anchor)
1560 } else {
1561 None
1562 }
1563 });
1564
1565 cursor.seek_forward(&Some(excerpt_id), Bias::Left, &());
1566 if cursor.item().is_none() {
1567 cursor.next(&());
1568 }
1569
1570 let position = D::from_text_summary(&cursor.start().text);
1571 if let Some(excerpt) = cursor.item() {
1572 if excerpt.id == *excerpt_id && excerpt.buffer_id == buffer_id {
1573 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1574 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1575 summaries.extend(
1576 excerpt
1577 .buffer
1578 .summaries_for_anchors::<D, _>(excerpt_anchors)
1579 .map(move |summary| {
1580 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
1581 let mut position = position.clone();
1582 let excerpt_buffer_start = excerpt_buffer_start.clone();
1583 if summary > excerpt_buffer_start {
1584 position.add_assign(&(summary - excerpt_buffer_start));
1585 }
1586 position
1587 }),
1588 );
1589 continue;
1590 }
1591 }
1592
1593 summaries.extend(excerpt_anchors.map(|_| position.clone()));
1594 }
1595
1596 summaries
1597 }
1598
1599 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
1600 where
1601 I: 'a + IntoIterator<Item = &'a Anchor>,
1602 {
1603 let mut anchors = anchors.into_iter().enumerate().peekable();
1604 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1605 let mut result = Vec::new();
1606 while let Some((_, anchor)) = anchors.peek() {
1607 let old_excerpt_id = &anchor.excerpt_id;
1608
1609 // Find the location where this anchor's excerpt should be.
1610 cursor.seek_forward(&Some(old_excerpt_id), Bias::Left, &());
1611 if cursor.item().is_none() {
1612 cursor.next(&());
1613 }
1614
1615 let next_excerpt = cursor.item();
1616 let prev_excerpt = cursor.prev_item();
1617
1618 // Process all of the anchors for this excerpt.
1619 while let Some((_, anchor)) = anchors.peek() {
1620 if anchor.excerpt_id != *old_excerpt_id {
1621 break;
1622 }
1623 let mut kept_position = false;
1624 let (anchor_ix, anchor) = anchors.next().unwrap();
1625 let mut anchor = anchor.clone();
1626
1627 // Leave min and max anchors unchanged.
1628 if *old_excerpt_id == ExcerptId::max() || *old_excerpt_id == ExcerptId::min() {
1629 kept_position = true;
1630 }
1631 // If the old excerpt still exists at this location, then leave
1632 // the anchor unchanged.
1633 else if next_excerpt.map_or(false, |excerpt| {
1634 excerpt.id == *old_excerpt_id && excerpt.contains(&anchor)
1635 }) {
1636 kept_position = true;
1637 }
1638 // If the old excerpt no longer exists at this location, then attempt to
1639 // find an equivalent position for this anchor in an adjacent excerpt.
1640 else {
1641 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
1642 if excerpt.contains(&anchor) {
1643 anchor.excerpt_id = excerpt.id.clone();
1644 kept_position = true;
1645 break;
1646 }
1647 }
1648 }
1649 // If there's no adjacent excerpt that contains the anchor's position,
1650 // then report that the anchor has lost its position.
1651 if !kept_position {
1652 anchor = if let Some(excerpt) = next_excerpt {
1653 let mut text_anchor = excerpt
1654 .range
1655 .start
1656 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1657 if text_anchor
1658 .cmp(&excerpt.range.end, &excerpt.buffer)
1659 .unwrap()
1660 .is_gt()
1661 {
1662 text_anchor = excerpt.range.end.clone();
1663 }
1664 Anchor {
1665 buffer_id: excerpt.buffer_id,
1666 excerpt_id: excerpt.id.clone(),
1667 text_anchor,
1668 }
1669 } else if let Some(excerpt) = prev_excerpt {
1670 let mut text_anchor = excerpt
1671 .range
1672 .end
1673 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1674 if text_anchor
1675 .cmp(&excerpt.range.start, &excerpt.buffer)
1676 .unwrap()
1677 .is_lt()
1678 {
1679 text_anchor = excerpt.range.start.clone();
1680 }
1681 Anchor {
1682 buffer_id: excerpt.buffer_id,
1683 excerpt_id: excerpt.id.clone(),
1684 text_anchor,
1685 }
1686 } else if anchor.text_anchor.bias == Bias::Left {
1687 Anchor::min()
1688 } else {
1689 Anchor::max()
1690 };
1691 }
1692
1693 result.push((anchor_ix, anchor, kept_position));
1694 }
1695 }
1696 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self).unwrap());
1697 result
1698 }
1699
1700 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
1701 self.anchor_at(position, Bias::Left)
1702 }
1703
1704 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
1705 self.anchor_at(position, Bias::Right)
1706 }
1707
1708 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
1709 let offset = position.to_offset(self);
1710 if let Some(excerpt) = self.as_singleton() {
1711 return Anchor {
1712 buffer_id: excerpt.buffer_id,
1713 excerpt_id: excerpt.id.clone(),
1714 text_anchor: excerpt.buffer.anchor_at(offset, bias),
1715 };
1716 }
1717
1718 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1719 cursor.seek(&offset, Bias::Right, &());
1720 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
1721 cursor.prev(&());
1722 }
1723 if let Some(excerpt) = cursor.item() {
1724 let mut overshoot = offset.saturating_sub(cursor.start().0);
1725 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
1726 overshoot -= 1;
1727 bias = Bias::Right;
1728 }
1729
1730 let buffer_start = excerpt.range.start.to_offset(&excerpt.buffer);
1731 let text_anchor =
1732 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
1733 Anchor {
1734 buffer_id: excerpt.buffer_id,
1735 excerpt_id: excerpt.id.clone(),
1736 text_anchor,
1737 }
1738 } else if offset == 0 && bias == Bias::Left {
1739 Anchor::min()
1740 } else {
1741 Anchor::max()
1742 }
1743 }
1744
1745 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
1746 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1747 cursor.seek(&Some(&excerpt_id), Bias::Left, &());
1748 if let Some(excerpt) = cursor.item() {
1749 if excerpt.id == excerpt_id {
1750 let text_anchor = excerpt.clip_anchor(text_anchor);
1751 drop(cursor);
1752 return Anchor {
1753 buffer_id: excerpt.buffer_id,
1754 excerpt_id,
1755 text_anchor,
1756 };
1757 }
1758 }
1759 panic!("excerpt not found");
1760 }
1761
1762 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
1763 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
1764 true
1765 } else if let Some((buffer_id, buffer_snapshot)) =
1766 self.buffer_snapshot_for_excerpt(&anchor.excerpt_id)
1767 {
1768 anchor.buffer_id == buffer_id && buffer_snapshot.can_resolve(&anchor.text_anchor)
1769 } else {
1770 false
1771 }
1772 }
1773
1774 pub fn range_contains_excerpt_boundary<T: ToOffset>(&self, range: Range<T>) -> bool {
1775 let start = range.start.to_offset(self);
1776 let end = range.end.to_offset(self);
1777 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1778 cursor.seek(&start, Bias::Right, &());
1779 let start_id = cursor
1780 .item()
1781 .or_else(|| cursor.prev_item())
1782 .map(|excerpt| &excerpt.id);
1783 cursor.seek_forward(&end, Bias::Right, &());
1784 let end_id = cursor
1785 .item()
1786 .or_else(|| cursor.prev_item())
1787 .map(|excerpt| &excerpt.id);
1788 start_id != end_id
1789 }
1790
1791 pub fn parse_count(&self) -> usize {
1792 self.parse_count
1793 }
1794
1795 pub fn enclosing_bracket_ranges<T: ToOffset>(
1796 &self,
1797 range: Range<T>,
1798 ) -> Option<(Range<usize>, Range<usize>)> {
1799 let range = range.start.to_offset(self)..range.end.to_offset(self);
1800
1801 let mut cursor = self.excerpts.cursor::<usize>();
1802 cursor.seek(&range.start, Bias::Right, &());
1803 let start_excerpt = cursor.item();
1804
1805 cursor.seek(&range.end, Bias::Right, &());
1806 let end_excerpt = cursor.item();
1807
1808 start_excerpt
1809 .zip(end_excerpt)
1810 .and_then(|(start_excerpt, end_excerpt)| {
1811 if start_excerpt.id != end_excerpt.id {
1812 return None;
1813 }
1814
1815 let excerpt_buffer_start =
1816 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1817 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1818
1819 let start_in_buffer =
1820 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1821 let end_in_buffer =
1822 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1823 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
1824 .buffer
1825 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
1826
1827 if start_bracket_range.start >= excerpt_buffer_start
1828 && end_bracket_range.end < excerpt_buffer_end
1829 {
1830 start_bracket_range.start =
1831 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
1832 start_bracket_range.end =
1833 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
1834 end_bracket_range.start =
1835 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
1836 end_bracket_range.end =
1837 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
1838 Some((start_bracket_range, end_bracket_range))
1839 } else {
1840 None
1841 }
1842 })
1843 }
1844
1845 pub fn diagnostics_update_count(&self) -> usize {
1846 self.diagnostics_update_count
1847 }
1848
1849 pub fn language(&self) -> Option<&Arc<Language>> {
1850 self.excerpts
1851 .iter()
1852 .next()
1853 .and_then(|excerpt| excerpt.buffer.language())
1854 }
1855
1856 pub fn is_dirty(&self) -> bool {
1857 self.is_dirty
1858 }
1859
1860 pub fn has_conflict(&self) -> bool {
1861 self.has_conflict
1862 }
1863
1864 pub fn diagnostic_group<'a, O>(
1865 &'a self,
1866 group_id: usize,
1867 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1868 where
1869 O: text::FromAnchor + 'a,
1870 {
1871 self.as_singleton()
1872 .into_iter()
1873 .flat_map(move |excerpt| excerpt.buffer.diagnostic_group(group_id))
1874 }
1875
1876 pub fn diagnostics_in_range<'a, T, O>(
1877 &'a self,
1878 range: Range<T>,
1879 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1880 where
1881 T: 'a + ToOffset,
1882 O: 'a + text::FromAnchor,
1883 {
1884 self.as_singleton().into_iter().flat_map(move |excerpt| {
1885 excerpt
1886 .buffer
1887 .diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1888 })
1889 }
1890
1891 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1892 let range = range.start.to_offset(self)..range.end.to_offset(self);
1893
1894 let mut cursor = self.excerpts.cursor::<usize>();
1895 cursor.seek(&range.start, Bias::Right, &());
1896 let start_excerpt = cursor.item();
1897
1898 cursor.seek(&range.end, Bias::Right, &());
1899 let end_excerpt = cursor.item();
1900
1901 start_excerpt
1902 .zip(end_excerpt)
1903 .and_then(|(start_excerpt, end_excerpt)| {
1904 if start_excerpt.id != end_excerpt.id {
1905 return None;
1906 }
1907
1908 let excerpt_buffer_start =
1909 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1910 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1911
1912 let start_in_buffer =
1913 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1914 let end_in_buffer =
1915 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1916 let mut ancestor_buffer_range = start_excerpt
1917 .buffer
1918 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1919 ancestor_buffer_range.start =
1920 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1921 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1922
1923 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1924 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1925 Some(start..end)
1926 })
1927 }
1928
1929 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
1930 let excerpt = self.as_singleton()?;
1931 let outline = excerpt.buffer.outline(theme)?;
1932 Some(Outline::new(
1933 outline
1934 .items
1935 .into_iter()
1936 .map(|item| OutlineItem {
1937 depth: item.depth,
1938 range: self.anchor_in_excerpt(excerpt.id.clone(), item.range.start)
1939 ..self.anchor_in_excerpt(excerpt.id.clone(), item.range.end),
1940 text: item.text,
1941 highlight_ranges: item.highlight_ranges,
1942 name_ranges: item.name_ranges,
1943 })
1944 .collect(),
1945 ))
1946 }
1947
1948 fn buffer_snapshot_for_excerpt<'a>(
1949 &'a self,
1950 excerpt_id: &'a ExcerptId,
1951 ) -> Option<(usize, &'a BufferSnapshot)> {
1952 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1953 cursor.seek(&Some(excerpt_id), Bias::Left, &());
1954 if let Some(excerpt) = cursor.item() {
1955 if excerpt.id == *excerpt_id {
1956 return Some((excerpt.buffer_id, &excerpt.buffer));
1957 }
1958 }
1959 None
1960 }
1961
1962 pub fn remote_selections_in_range<'a>(
1963 &'a self,
1964 range: &'a Range<Anchor>,
1965 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
1966 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1967 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
1968 cursor
1969 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
1970 .flat_map(move |excerpt| {
1971 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
1972 if excerpt.id == range.start.excerpt_id {
1973 query_range.start = range.start.text_anchor.clone();
1974 }
1975 if excerpt.id == range.end.excerpt_id {
1976 query_range.end = range.end.text_anchor.clone();
1977 }
1978
1979 excerpt
1980 .buffer
1981 .remote_selections_in_range(query_range)
1982 .flat_map(move |(replica_id, selections)| {
1983 selections.map(move |selection| {
1984 let mut start = Anchor {
1985 buffer_id: excerpt.buffer_id,
1986 excerpt_id: excerpt.id.clone(),
1987 text_anchor: selection.start.clone(),
1988 };
1989 let mut end = Anchor {
1990 buffer_id: excerpt.buffer_id,
1991 excerpt_id: excerpt.id.clone(),
1992 text_anchor: selection.end.clone(),
1993 };
1994 if range.start.cmp(&start, self).unwrap().is_gt() {
1995 start = range.start.clone();
1996 }
1997 if range.end.cmp(&end, self).unwrap().is_lt() {
1998 end = range.end.clone();
1999 }
2000
2001 (
2002 replica_id,
2003 Selection {
2004 id: selection.id,
2005 start,
2006 end,
2007 reversed: selection.reversed,
2008 goal: selection.goal,
2009 },
2010 )
2011 })
2012 })
2013 })
2014 }
2015}
2016
2017impl History {
2018 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
2019 self.transaction_depth += 1;
2020 if self.transaction_depth == 1 {
2021 let id = post_inc(&mut self.next_transaction_id);
2022 self.undo_stack.push(Transaction {
2023 id,
2024 buffer_transactions: Default::default(),
2025 first_edit_at: now,
2026 last_edit_at: now,
2027 });
2028 Some(id)
2029 } else {
2030 None
2031 }
2032 }
2033
2034 fn end_transaction(
2035 &mut self,
2036 now: Instant,
2037 buffer_transactions: HashSet<(usize, TransactionId)>,
2038 ) -> bool {
2039 assert_ne!(self.transaction_depth, 0);
2040 self.transaction_depth -= 1;
2041 if self.transaction_depth == 0 {
2042 if buffer_transactions.is_empty() {
2043 self.undo_stack.pop();
2044 false
2045 } else {
2046 let transaction = self.undo_stack.last_mut().unwrap();
2047 transaction.last_edit_at = now;
2048 transaction.buffer_transactions.extend(buffer_transactions);
2049 true
2050 }
2051 } else {
2052 false
2053 }
2054 }
2055
2056 fn pop_undo(&mut self) -> Option<&Transaction> {
2057 assert_eq!(self.transaction_depth, 0);
2058 if let Some(transaction) = self.undo_stack.pop() {
2059 self.redo_stack.push(transaction);
2060 self.redo_stack.last()
2061 } else {
2062 None
2063 }
2064 }
2065
2066 fn pop_redo(&mut self) -> Option<&Transaction> {
2067 assert_eq!(self.transaction_depth, 0);
2068 if let Some(transaction) = self.redo_stack.pop() {
2069 self.undo_stack.push(transaction);
2070 self.undo_stack.last()
2071 } else {
2072 None
2073 }
2074 }
2075
2076 fn group(&mut self) -> Option<TransactionId> {
2077 let mut new_len = self.undo_stack.len();
2078 let mut transactions = self.undo_stack.iter_mut();
2079
2080 if let Some(mut transaction) = transactions.next_back() {
2081 while let Some(prev_transaction) = transactions.next_back() {
2082 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
2083 {
2084 transaction = prev_transaction;
2085 new_len -= 1;
2086 } else {
2087 break;
2088 }
2089 }
2090 }
2091
2092 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
2093 if let Some(last_transaction) = transactions_to_keep.last_mut() {
2094 if let Some(transaction) = transactions_to_merge.last() {
2095 last_transaction.last_edit_at = transaction.last_edit_at;
2096 }
2097 }
2098
2099 self.undo_stack.truncate(new_len);
2100 self.undo_stack.last().map(|t| t.id)
2101 }
2102}
2103
2104impl Excerpt {
2105 fn new(
2106 id: ExcerptId,
2107 buffer_id: usize,
2108 buffer: BufferSnapshot,
2109 range: Range<text::Anchor>,
2110 has_trailing_newline: bool,
2111 ) -> Self {
2112 Excerpt {
2113 id,
2114 max_buffer_row: range.end.to_point(&buffer).row,
2115 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
2116 buffer_id,
2117 buffer,
2118 range,
2119 has_trailing_newline,
2120 }
2121 }
2122
2123 fn chunks_in_range<'a>(
2124 &'a self,
2125 range: Range<usize>,
2126 theme: Option<&'a SyntaxTheme>,
2127 ) -> ExcerptChunks<'a> {
2128 let content_start = self.range.start.to_offset(&self.buffer);
2129 let chunks_start = content_start + range.start;
2130 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2131
2132 let footer_height = if self.has_trailing_newline
2133 && range.start <= self.text_summary.bytes
2134 && range.end > self.text_summary.bytes
2135 {
2136 1
2137 } else {
2138 0
2139 };
2140
2141 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
2142
2143 ExcerptChunks {
2144 content_chunks,
2145 footer_height,
2146 }
2147 }
2148
2149 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
2150 let content_start = self.range.start.to_offset(&self.buffer);
2151 let bytes_start = content_start + range.start;
2152 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2153 let footer_height = if self.has_trailing_newline
2154 && range.start <= self.text_summary.bytes
2155 && range.end > self.text_summary.bytes
2156 {
2157 1
2158 } else {
2159 0
2160 };
2161 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
2162
2163 ExcerptBytes {
2164 content_bytes,
2165 footer_height,
2166 }
2167 }
2168
2169 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
2170 if text_anchor
2171 .cmp(&self.range.start, &self.buffer)
2172 .unwrap()
2173 .is_lt()
2174 {
2175 self.range.start.clone()
2176 } else if text_anchor
2177 .cmp(&self.range.end, &self.buffer)
2178 .unwrap()
2179 .is_gt()
2180 {
2181 self.range.end.clone()
2182 } else {
2183 text_anchor
2184 }
2185 }
2186
2187 fn contains(&self, anchor: &Anchor) -> bool {
2188 self.buffer_id == anchor.buffer_id
2189 && self
2190 .range
2191 .start
2192 .cmp(&anchor.text_anchor, &self.buffer)
2193 .unwrap()
2194 .is_le()
2195 && self
2196 .range
2197 .end
2198 .cmp(&anchor.text_anchor, &self.buffer)
2199 .unwrap()
2200 .is_ge()
2201 }
2202}
2203
2204impl fmt::Debug for Excerpt {
2205 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2206 f.debug_struct("Excerpt")
2207 .field("id", &self.id)
2208 .field("buffer_id", &self.buffer_id)
2209 .field("range", &self.range)
2210 .field("text_summary", &self.text_summary)
2211 .field("has_trailing_newline", &self.has_trailing_newline)
2212 .finish()
2213 }
2214}
2215
2216impl sum_tree::Item for Excerpt {
2217 type Summary = ExcerptSummary;
2218
2219 fn summary(&self) -> Self::Summary {
2220 let mut text = self.text_summary.clone();
2221 if self.has_trailing_newline {
2222 text += TextSummary::from("\n");
2223 }
2224 ExcerptSummary {
2225 excerpt_id: self.id.clone(),
2226 max_buffer_row: self.max_buffer_row,
2227 text,
2228 }
2229 }
2230}
2231
2232impl sum_tree::Summary for ExcerptSummary {
2233 type Context = ();
2234
2235 fn add_summary(&mut self, summary: &Self, _: &()) {
2236 debug_assert!(summary.excerpt_id > self.excerpt_id);
2237 self.excerpt_id = summary.excerpt_id.clone();
2238 self.text.add_summary(&summary.text, &());
2239 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
2240 }
2241}
2242
2243impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
2244 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2245 *self += &summary.text;
2246 }
2247}
2248
2249impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
2250 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2251 *self += summary.text.bytes;
2252 }
2253}
2254
2255impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
2256 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2257 Ord::cmp(self, &cursor_location.text.bytes)
2258 }
2259}
2260
2261impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
2262 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2263 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
2264 }
2265}
2266
2267impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
2268 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2269 *self += summary.text.lines;
2270 }
2271}
2272
2273impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
2274 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2275 *self += summary.text.lines_utf16
2276 }
2277}
2278
2279impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
2280 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2281 *self = Some(&summary.excerpt_id);
2282 }
2283}
2284
2285impl<'a> MultiBufferRows<'a> {
2286 pub fn seek(&mut self, row: u32) {
2287 self.buffer_row_range = 0..0;
2288
2289 self.excerpts
2290 .seek_forward(&Point::new(row, 0), Bias::Right, &());
2291 if self.excerpts.item().is_none() {
2292 self.excerpts.prev(&());
2293
2294 if self.excerpts.item().is_none() && row == 0 {
2295 self.buffer_row_range = 0..1;
2296 return;
2297 }
2298 }
2299
2300 if let Some(excerpt) = self.excerpts.item() {
2301 let overshoot = row - self.excerpts.start().row;
2302 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
2303 self.buffer_row_range.start = excerpt_start + overshoot;
2304 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
2305 }
2306 }
2307}
2308
2309impl<'a> Iterator for MultiBufferRows<'a> {
2310 type Item = Option<u32>;
2311
2312 fn next(&mut self) -> Option<Self::Item> {
2313 loop {
2314 if !self.buffer_row_range.is_empty() {
2315 let row = Some(self.buffer_row_range.start);
2316 self.buffer_row_range.start += 1;
2317 return Some(row);
2318 }
2319 self.excerpts.item()?;
2320 self.excerpts.next(&());
2321 let excerpt = self.excerpts.item()?;
2322 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
2323 self.buffer_row_range.end =
2324 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
2325 }
2326 }
2327}
2328
2329impl<'a> MultiBufferChunks<'a> {
2330 pub fn offset(&self) -> usize {
2331 self.range.start
2332 }
2333
2334 pub fn seek(&mut self, offset: usize) {
2335 self.range.start = offset;
2336 self.excerpts.seek(&offset, Bias::Right, &());
2337 if let Some(excerpt) = self.excerpts.item() {
2338 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2339 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
2340 self.theme,
2341 ));
2342 } else {
2343 self.excerpt_chunks = None;
2344 }
2345 }
2346}
2347
2348impl<'a> Iterator for MultiBufferChunks<'a> {
2349 type Item = Chunk<'a>;
2350
2351 fn next(&mut self) -> Option<Self::Item> {
2352 if self.range.is_empty() {
2353 None
2354 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
2355 self.range.start += chunk.text.len();
2356 Some(chunk)
2357 } else {
2358 self.excerpts.next(&());
2359 let excerpt = self.excerpts.item()?;
2360 self.excerpt_chunks = Some(
2361 excerpt.chunks_in_range(0..self.range.end - self.excerpts.start(), self.theme),
2362 );
2363 self.next()
2364 }
2365 }
2366}
2367
2368impl<'a> MultiBufferBytes<'a> {
2369 fn consume(&mut self, len: usize) {
2370 self.range.start += len;
2371 self.chunk = &self.chunk[len..];
2372
2373 if !self.range.is_empty() && self.chunk.is_empty() {
2374 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
2375 self.chunk = chunk;
2376 } else {
2377 self.excerpts.next(&());
2378 if let Some(excerpt) = self.excerpts.item() {
2379 let mut excerpt_bytes =
2380 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
2381 self.chunk = excerpt_bytes.next().unwrap();
2382 self.excerpt_bytes = Some(excerpt_bytes);
2383 }
2384 }
2385 }
2386 }
2387}
2388
2389impl<'a> Iterator for MultiBufferBytes<'a> {
2390 type Item = &'a [u8];
2391
2392 fn next(&mut self) -> Option<Self::Item> {
2393 let chunk = self.chunk;
2394 if chunk.is_empty() {
2395 None
2396 } else {
2397 self.consume(chunk.len());
2398 Some(chunk)
2399 }
2400 }
2401}
2402
2403impl<'a> io::Read for MultiBufferBytes<'a> {
2404 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2405 let len = cmp::min(buf.len(), self.chunk.len());
2406 buf[..len].copy_from_slice(&self.chunk[..len]);
2407 if len > 0 {
2408 self.consume(len);
2409 }
2410 Ok(len)
2411 }
2412}
2413
2414impl<'a> Iterator for ExcerptBytes<'a> {
2415 type Item = &'a [u8];
2416
2417 fn next(&mut self) -> Option<Self::Item> {
2418 if let Some(chunk) = self.content_bytes.next() {
2419 if !chunk.is_empty() {
2420 return Some(chunk);
2421 }
2422 }
2423
2424 if self.footer_height > 0 {
2425 let result = &NEWLINES[..self.footer_height];
2426 self.footer_height = 0;
2427 return Some(result);
2428 }
2429
2430 None
2431 }
2432}
2433
2434impl<'a> Iterator for ExcerptChunks<'a> {
2435 type Item = Chunk<'a>;
2436
2437 fn next(&mut self) -> Option<Self::Item> {
2438 if let Some(chunk) = self.content_chunks.next() {
2439 return Some(chunk);
2440 }
2441
2442 if self.footer_height > 0 {
2443 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2444 self.footer_height = 0;
2445 return Some(Chunk {
2446 text,
2447 ..Default::default()
2448 });
2449 }
2450
2451 None
2452 }
2453}
2454
2455impl ToOffset for Point {
2456 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2457 snapshot.point_to_offset(*self)
2458 }
2459}
2460
2461impl ToOffset for PointUtf16 {
2462 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2463 snapshot.point_utf16_to_offset(*self)
2464 }
2465}
2466
2467impl ToOffset for usize {
2468 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2469 assert!(*self <= snapshot.len(), "offset is out of range");
2470 *self
2471 }
2472}
2473
2474impl ToPoint for usize {
2475 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2476 snapshot.offset_to_point(*self)
2477 }
2478}
2479
2480impl ToPoint for Point {
2481 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2482 *self
2483 }
2484}
2485
2486pub fn char_kind(c: char) -> CharKind {
2487 if c == '\n' {
2488 CharKind::Newline
2489 } else if c.is_whitespace() {
2490 CharKind::Whitespace
2491 } else if c.is_alphanumeric() || c == '_' {
2492 CharKind::Word
2493 } else {
2494 CharKind::Punctuation
2495 }
2496}
2497
2498#[cfg(test)]
2499mod tests {
2500 use super::*;
2501 use gpui::MutableAppContext;
2502 use language::{Buffer, Rope};
2503 use rand::prelude::*;
2504 use std::env;
2505 use text::{Point, RandomCharIter};
2506 use util::test::sample_text;
2507
2508 #[gpui::test]
2509 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2510 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2511 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2512
2513 let snapshot = multibuffer.read(cx).snapshot(cx);
2514 assert_eq!(snapshot.text(), buffer.read(cx).text());
2515
2516 assert_eq!(
2517 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2518 (0..buffer.read(cx).row_count())
2519 .map(Some)
2520 .collect::<Vec<_>>()
2521 );
2522
2523 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2524 let snapshot = multibuffer.read(cx).snapshot(cx);
2525
2526 assert_eq!(snapshot.text(), buffer.read(cx).text());
2527 assert_eq!(
2528 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2529 (0..buffer.read(cx).row_count())
2530 .map(Some)
2531 .collect::<Vec<_>>()
2532 );
2533 }
2534
2535 #[gpui::test]
2536 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2537 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2538 let guest_buffer = cx.add_model(|cx| {
2539 let message = host_buffer.read(cx).to_proto();
2540 Buffer::from_proto(1, message, None, cx).unwrap()
2541 });
2542 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2543 let snapshot = multibuffer.read(cx).snapshot(cx);
2544 assert_eq!(snapshot.text(), "a");
2545
2546 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2547 let snapshot = multibuffer.read(cx).snapshot(cx);
2548 assert_eq!(snapshot.text(), "ab");
2549
2550 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2551 let snapshot = multibuffer.read(cx).snapshot(cx);
2552 assert_eq!(snapshot.text(), "abc");
2553 }
2554
2555 #[gpui::test]
2556 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2557 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2558 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2559 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2560
2561 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2562 let subscription = multibuffer.subscribe();
2563 multibuffer.push_excerpt(
2564 ExcerptProperties {
2565 buffer: &buffer_1,
2566 range: Point::new(1, 2)..Point::new(2, 5),
2567 },
2568 cx,
2569 );
2570 assert_eq!(
2571 subscription.consume().into_inner(),
2572 [Edit {
2573 old: 0..0,
2574 new: 0..10
2575 }]
2576 );
2577
2578 multibuffer.push_excerpt(
2579 ExcerptProperties {
2580 buffer: &buffer_1,
2581 range: Point::new(3, 3)..Point::new(4, 4),
2582 },
2583 cx,
2584 );
2585 multibuffer.push_excerpt(
2586 ExcerptProperties {
2587 buffer: &buffer_2,
2588 range: Point::new(3, 1)..Point::new(3, 3),
2589 },
2590 cx,
2591 );
2592 assert_eq!(
2593 subscription.consume().into_inner(),
2594 [Edit {
2595 old: 10..10,
2596 new: 10..22
2597 }]
2598 );
2599
2600 subscription
2601 });
2602
2603 let snapshot = multibuffer.read(cx).snapshot(cx);
2604 assert_eq!(
2605 snapshot.text(),
2606 concat!(
2607 "bbbb\n", // Preserve newlines
2608 "ccccc\n", //
2609 "ddd\n", //
2610 "eeee\n", //
2611 "jj" //
2612 )
2613 );
2614 assert_eq!(
2615 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2616 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2617 );
2618 assert_eq!(
2619 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2620 [Some(3), Some(4), Some(3)]
2621 );
2622 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2623 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2624 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2625 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2626 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2627 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2628 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2629 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2630
2631 buffer_1.update(cx, |buffer, cx| {
2632 buffer.edit(
2633 [
2634 Point::new(0, 0)..Point::new(0, 0),
2635 Point::new(2, 1)..Point::new(2, 3),
2636 ],
2637 "\n",
2638 cx,
2639 );
2640 });
2641
2642 let snapshot = multibuffer.read(cx).snapshot(cx);
2643 assert_eq!(
2644 snapshot.text(),
2645 concat!(
2646 "bbbb\n", // Preserve newlines
2647 "c\n", //
2648 "cc\n", //
2649 "ddd\n", //
2650 "eeee\n", //
2651 "jj" //
2652 )
2653 );
2654
2655 assert_eq!(
2656 subscription.consume().into_inner(),
2657 [Edit {
2658 old: 6..8,
2659 new: 6..7
2660 }]
2661 );
2662
2663 let snapshot = multibuffer.read(cx).snapshot(cx);
2664 assert_eq!(
2665 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2666 Point::new(0, 4)
2667 );
2668 assert_eq!(
2669 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2670 Point::new(0, 4)
2671 );
2672 assert_eq!(
2673 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2674 Point::new(5, 1)
2675 );
2676 assert_eq!(
2677 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2678 Point::new(5, 2)
2679 );
2680 assert_eq!(
2681 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2682 Point::new(5, 2)
2683 );
2684
2685 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2686 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2687 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2688 multibuffer.snapshot(cx)
2689 });
2690
2691 assert_eq!(
2692 snapshot.text(),
2693 concat!(
2694 "bbbb\n", // Preserve newlines
2695 "c\n", //
2696 "cc\n", //
2697 "ddd\n", //
2698 "eeee", //
2699 )
2700 );
2701 }
2702
2703 #[gpui::test]
2704 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2705 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2706
2707 let snapshot = multibuffer.read(cx).snapshot(cx);
2708 assert_eq!(snapshot.text(), "");
2709 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2710 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2711 }
2712
2713 #[gpui::test]
2714 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2715 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2716 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2717 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2718 buffer.update(cx, |buffer, cx| {
2719 buffer.edit([0..0], "X", cx);
2720 buffer.edit([5..5], "Y", cx);
2721 });
2722 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2723
2724 assert_eq!(old_snapshot.text(), "abcd");
2725 assert_eq!(new_snapshot.text(), "XabcdY");
2726
2727 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2728 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2729 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2730 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2731 }
2732
2733 #[gpui::test]
2734 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2735 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2736 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2737 let multibuffer = cx.add_model(|cx| {
2738 let mut multibuffer = MultiBuffer::new(0);
2739 multibuffer.push_excerpt(
2740 ExcerptProperties {
2741 buffer: &buffer_1,
2742 range: 0..4,
2743 },
2744 cx,
2745 );
2746 multibuffer.push_excerpt(
2747 ExcerptProperties {
2748 buffer: &buffer_2,
2749 range: 0..5,
2750 },
2751 cx,
2752 );
2753 multibuffer
2754 });
2755 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2756
2757 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2758 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2759 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2760 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2761 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2762 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2763
2764 buffer_1.update(cx, |buffer, cx| {
2765 buffer.edit([0..0], "W", cx);
2766 buffer.edit([5..5], "X", cx);
2767 });
2768 buffer_2.update(cx, |buffer, cx| {
2769 buffer.edit([0..0], "Y", cx);
2770 buffer.edit([6..0], "Z", cx);
2771 });
2772 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2773
2774 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2775 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2776
2777 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2778 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2779 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2780 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2781 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2782 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2783 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2784 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2785 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2786 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2787 }
2788
2789 #[gpui::test]
2790 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
2791 cx: &mut MutableAppContext,
2792 ) {
2793 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2794 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
2795 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2796
2797 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
2798 // Add an excerpt from buffer 1 that spans this new insertion.
2799 buffer_1.update(cx, |buffer, cx| buffer.edit([4..4], "123", cx));
2800 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
2801 multibuffer.push_excerpt(
2802 ExcerptProperties {
2803 buffer: &buffer_1,
2804 range: 0..7,
2805 },
2806 cx,
2807 )
2808 });
2809
2810 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
2811 assert_eq!(snapshot_1.text(), "abcd123");
2812
2813 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
2814 let (excerpt_id_2, excerpt_id_3, _) = multibuffer.update(cx, |multibuffer, cx| {
2815 multibuffer.remove_excerpts([&excerpt_id_1], cx);
2816 (
2817 multibuffer.push_excerpt(
2818 ExcerptProperties {
2819 buffer: &buffer_2,
2820 range: 0..4,
2821 },
2822 cx,
2823 ),
2824 multibuffer.push_excerpt(
2825 ExcerptProperties {
2826 buffer: &buffer_2,
2827 range: 6..10,
2828 },
2829 cx,
2830 ),
2831 multibuffer.push_excerpt(
2832 ExcerptProperties {
2833 buffer: &buffer_2,
2834 range: 12..16,
2835 },
2836 cx,
2837 ),
2838 )
2839 });
2840 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
2841 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
2842
2843 // The old excerpt id has been reused.
2844 assert_eq!(excerpt_id_2, excerpt_id_1);
2845
2846 // Resolve some anchors from the previous snapshot in the new snapshot.
2847 // Although there is still an excerpt with the same id, it is for
2848 // a different buffer, so we don't attempt to resolve the old text
2849 // anchor in the new buffer.
2850 assert_eq!(
2851 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
2852 0
2853 );
2854 assert_eq!(
2855 snapshot_2.summaries_for_anchors::<usize, _>(&[
2856 snapshot_1.anchor_before(2),
2857 snapshot_1.anchor_after(3)
2858 ]),
2859 vec![0, 0]
2860 );
2861 let refresh =
2862 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
2863 assert_eq!(
2864 refresh,
2865 &[
2866 (0, snapshot_2.anchor_before(0), false),
2867 (1, snapshot_2.anchor_after(0), false),
2868 ]
2869 );
2870
2871 // Replace the middle excerpt with a smaller excerpt in buffer 2,
2872 // that intersects the old excerpt.
2873 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
2874 multibuffer.remove_excerpts([&excerpt_id_3], cx);
2875 multibuffer.insert_excerpt_after(
2876 &excerpt_id_3,
2877 ExcerptProperties {
2878 buffer: &buffer_2,
2879 range: 5..8,
2880 },
2881 cx,
2882 )
2883 });
2884
2885 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
2886 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
2887 assert_ne!(excerpt_id_5, excerpt_id_3);
2888
2889 // Resolve some anchors from the previous snapshot in the new snapshot.
2890 // The anchor in the middle excerpt snaps to the beginning of the
2891 // excerpt, since it is not
2892 let anchors = [
2893 snapshot_2.anchor_before(0),
2894 snapshot_2.anchor_after(2),
2895 snapshot_2.anchor_after(6),
2896 snapshot_2.anchor_after(14),
2897 ];
2898 assert_eq!(
2899 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
2900 &[0, 2, 9, 13]
2901 );
2902
2903 let new_anchors = snapshot_3.refresh_anchors(&anchors);
2904 assert_eq!(
2905 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
2906 &[(0, true), (1, true), (2, true), (3, true)]
2907 );
2908 assert_eq!(
2909 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
2910 &[0, 2, 7, 13]
2911 );
2912 }
2913
2914 #[gpui::test(iterations = 100)]
2915 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
2916 let operations = env::var("OPERATIONS")
2917 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2918 .unwrap_or(10);
2919
2920 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2921 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2922 let mut excerpt_ids = Vec::new();
2923 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2924 let mut anchors = Vec::new();
2925 let mut old_versions = Vec::new();
2926
2927 for _ in 0..operations {
2928 match rng.gen_range(0..100) {
2929 0..=19 if !buffers.is_empty() => {
2930 let buffer = buffers.choose(&mut rng).unwrap();
2931 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
2932 }
2933 20..=29 if !expected_excerpts.is_empty() => {
2934 let mut ids_to_remove = vec![];
2935 for _ in 0..rng.gen_range(1..=3) {
2936 if expected_excerpts.is_empty() {
2937 break;
2938 }
2939
2940 let ix = rng.gen_range(0..expected_excerpts.len());
2941 ids_to_remove.push(excerpt_ids.remove(ix));
2942 let (buffer, range) = expected_excerpts.remove(ix);
2943 let buffer = buffer.read(cx);
2944 log::info!(
2945 "Removing excerpt {}: {:?}",
2946 ix,
2947 buffer
2948 .text_for_range(range.to_offset(&buffer))
2949 .collect::<String>(),
2950 );
2951 }
2952 ids_to_remove.sort_unstable();
2953 multibuffer.update(cx, |multibuffer, cx| {
2954 multibuffer.remove_excerpts(&ids_to_remove, cx)
2955 });
2956 }
2957 30..=39 if !expected_excerpts.is_empty() => {
2958 let multibuffer = multibuffer.read(cx).read(cx);
2959 let offset =
2960 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
2961 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
2962 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
2963 anchors.push(multibuffer.anchor_at(offset, bias));
2964 anchors.sort_by(|a, b| a.cmp(&b, &multibuffer).unwrap());
2965 }
2966 40..=44 if !anchors.is_empty() => {
2967 let multibuffer = multibuffer.read(cx).read(cx);
2968
2969 anchors = multibuffer
2970 .refresh_anchors(&anchors)
2971 .into_iter()
2972 .map(|a| a.1)
2973 .collect();
2974
2975 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
2976 // overshoot its boundaries.
2977 let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
2978 for anchor in &anchors {
2979 if anchor.excerpt_id == ExcerptId::min()
2980 || anchor.excerpt_id == ExcerptId::max()
2981 {
2982 continue;
2983 }
2984
2985 cursor.seek_forward(&Some(&anchor.excerpt_id), Bias::Left, &());
2986 let excerpt = cursor.item().unwrap();
2987 assert_eq!(excerpt.id, anchor.excerpt_id);
2988 assert!(excerpt.contains(anchor));
2989 }
2990 }
2991 _ => {
2992 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
2993 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
2994 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
2995 buffers.last().unwrap()
2996 } else {
2997 buffers.choose(&mut rng).unwrap()
2998 };
2999
3000 let buffer = buffer_handle.read(cx);
3001 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
3002 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3003 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
3004 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
3005 let prev_excerpt_id = excerpt_ids
3006 .get(prev_excerpt_ix)
3007 .cloned()
3008 .unwrap_or(ExcerptId::max());
3009 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
3010
3011 log::info!(
3012 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
3013 excerpt_ix,
3014 expected_excerpts.len(),
3015 buffer_handle.id(),
3016 buffer.text(),
3017 start_ix..end_ix,
3018 &buffer.text()[start_ix..end_ix]
3019 );
3020
3021 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
3022 multibuffer.insert_excerpt_after(
3023 &prev_excerpt_id,
3024 ExcerptProperties {
3025 buffer: &buffer_handle,
3026 range: start_ix..end_ix,
3027 },
3028 cx,
3029 )
3030 });
3031
3032 excerpt_ids.insert(excerpt_ix, excerpt_id);
3033 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
3034 }
3035 }
3036
3037 if rng.gen_bool(0.3) {
3038 multibuffer.update(cx, |multibuffer, cx| {
3039 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
3040 })
3041 }
3042
3043 let snapshot = multibuffer.read(cx).snapshot(cx);
3044
3045 let mut excerpt_starts = Vec::new();
3046 let mut expected_text = String::new();
3047 let mut expected_buffer_rows = Vec::new();
3048 for (buffer, range) in &expected_excerpts {
3049 let buffer = buffer.read(cx);
3050 let buffer_range = range.to_offset(buffer);
3051
3052 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
3053 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
3054 expected_text.push('\n');
3055
3056 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
3057 ..=buffer.offset_to_point(buffer_range.end).row;
3058 for row in buffer_row_range {
3059 expected_buffer_rows.push(Some(row));
3060 }
3061 }
3062 // Remove final trailing newline.
3063 if !expected_excerpts.is_empty() {
3064 expected_text.pop();
3065 }
3066
3067 // Always report one buffer row
3068 if expected_buffer_rows.is_empty() {
3069 expected_buffer_rows.push(Some(0));
3070 }
3071
3072 assert_eq!(snapshot.text(), expected_text);
3073 log::info!("MultiBuffer text: {:?}", expected_text);
3074
3075 assert_eq!(
3076 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3077 expected_buffer_rows,
3078 );
3079
3080 for _ in 0..5 {
3081 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
3082 assert_eq!(
3083 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
3084 &expected_buffer_rows[start_row..],
3085 "buffer_rows({})",
3086 start_row
3087 );
3088 }
3089
3090 assert_eq!(
3091 snapshot.max_buffer_row(),
3092 expected_buffer_rows
3093 .into_iter()
3094 .filter_map(|r| r)
3095 .max()
3096 .unwrap()
3097 );
3098
3099 let mut excerpt_starts = excerpt_starts.into_iter();
3100 for (buffer, range) in &expected_excerpts {
3101 let buffer_id = buffer.id();
3102 let buffer = buffer.read(cx);
3103 let buffer_range = range.to_offset(buffer);
3104 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
3105 let buffer_start_point_utf16 =
3106 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
3107
3108 let excerpt_start = excerpt_starts.next().unwrap();
3109 let mut offset = excerpt_start.bytes;
3110 let mut buffer_offset = buffer_range.start;
3111 let mut point = excerpt_start.lines;
3112 let mut buffer_point = buffer_start_point;
3113 let mut point_utf16 = excerpt_start.lines_utf16;
3114 let mut buffer_point_utf16 = buffer_start_point_utf16;
3115 for ch in buffer
3116 .snapshot()
3117 .chunks(buffer_range.clone(), None)
3118 .flat_map(|c| c.text.chars())
3119 {
3120 for _ in 0..ch.len_utf8() {
3121 let left_offset = snapshot.clip_offset(offset, Bias::Left);
3122 let right_offset = snapshot.clip_offset(offset, Bias::Right);
3123 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
3124 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
3125 assert_eq!(
3126 left_offset,
3127 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
3128 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
3129 offset,
3130 buffer_id,
3131 buffer_offset,
3132 );
3133 assert_eq!(
3134 right_offset,
3135 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
3136 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
3137 offset,
3138 buffer_id,
3139 buffer_offset,
3140 );
3141
3142 let left_point = snapshot.clip_point(point, Bias::Left);
3143 let right_point = snapshot.clip_point(point, Bias::Right);
3144 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
3145 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
3146 assert_eq!(
3147 left_point,
3148 excerpt_start.lines + (buffer_left_point - buffer_start_point),
3149 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
3150 point,
3151 buffer_id,
3152 buffer_point,
3153 );
3154 assert_eq!(
3155 right_point,
3156 excerpt_start.lines + (buffer_right_point - buffer_start_point),
3157 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
3158 point,
3159 buffer_id,
3160 buffer_point,
3161 );
3162
3163 assert_eq!(
3164 snapshot.point_to_offset(left_point),
3165 left_offset,
3166 "point_to_offset({:?})",
3167 left_point,
3168 );
3169 assert_eq!(
3170 snapshot.offset_to_point(left_offset),
3171 left_point,
3172 "offset_to_point({:?})",
3173 left_offset,
3174 );
3175
3176 offset += 1;
3177 buffer_offset += 1;
3178 if ch == '\n' {
3179 point += Point::new(1, 0);
3180 buffer_point += Point::new(1, 0);
3181 } else {
3182 point += Point::new(0, 1);
3183 buffer_point += Point::new(0, 1);
3184 }
3185 }
3186
3187 for _ in 0..ch.len_utf16() {
3188 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
3189 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
3190 let buffer_left_point_utf16 =
3191 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
3192 let buffer_right_point_utf16 =
3193 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
3194 assert_eq!(
3195 left_point_utf16,
3196 excerpt_start.lines_utf16
3197 + (buffer_left_point_utf16 - buffer_start_point_utf16),
3198 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
3199 point_utf16,
3200 buffer_id,
3201 buffer_point_utf16,
3202 );
3203 assert_eq!(
3204 right_point_utf16,
3205 excerpt_start.lines_utf16
3206 + (buffer_right_point_utf16 - buffer_start_point_utf16),
3207 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
3208 point_utf16,
3209 buffer_id,
3210 buffer_point_utf16,
3211 );
3212
3213 if ch == '\n' {
3214 point_utf16 += PointUtf16::new(1, 0);
3215 buffer_point_utf16 += PointUtf16::new(1, 0);
3216 } else {
3217 point_utf16 += PointUtf16::new(0, 1);
3218 buffer_point_utf16 += PointUtf16::new(0, 1);
3219 }
3220 }
3221 }
3222 }
3223
3224 for (row, line) in expected_text.split('\n').enumerate() {
3225 assert_eq!(
3226 snapshot.line_len(row as u32),
3227 line.len() as u32,
3228 "line_len({}).",
3229 row
3230 );
3231 }
3232
3233 let text_rope = Rope::from(expected_text.as_str());
3234 for _ in 0..10 {
3235 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3236 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3237
3238 let text_for_range = snapshot
3239 .text_for_range(start_ix..end_ix)
3240 .collect::<String>();
3241 assert_eq!(
3242 text_for_range,
3243 &expected_text[start_ix..end_ix],
3244 "incorrect text for range {:?}",
3245 start_ix..end_ix
3246 );
3247
3248 let excerpted_buffer_ranges =
3249 multibuffer.read(cx).excerpted_buffers(start_ix..end_ix, cx);
3250 let excerpted_buffers_text = excerpted_buffer_ranges
3251 .into_iter()
3252 .map(|(buffer, buffer_range)| {
3253 buffer
3254 .read(cx)
3255 .text_for_range(buffer_range)
3256 .collect::<String>()
3257 })
3258 .collect::<Vec<_>>()
3259 .join("\n");
3260 assert_eq!(excerpted_buffers_text, text_for_range);
3261
3262 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
3263 assert_eq!(
3264 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
3265 expected_summary,
3266 "incorrect summary for range {:?}",
3267 start_ix..end_ix
3268 );
3269 }
3270
3271 // Anchor resolution
3272 for (anchor, resolved_offset) in anchors
3273 .iter()
3274 .zip(snapshot.summaries_for_anchors::<usize, _>(&anchors))
3275 {
3276 assert!(resolved_offset <= snapshot.len());
3277 assert_eq!(
3278 snapshot.summary_for_anchor::<usize>(anchor),
3279 resolved_offset
3280 );
3281 }
3282
3283 for _ in 0..10 {
3284 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3285 assert_eq!(
3286 snapshot.reversed_chars_at(end_ix).collect::<String>(),
3287 expected_text[..end_ix].chars().rev().collect::<String>(),
3288 );
3289 }
3290
3291 for _ in 0..10 {
3292 let end_ix = rng.gen_range(0..=text_rope.len());
3293 let start_ix = rng.gen_range(0..=end_ix);
3294 assert_eq!(
3295 snapshot
3296 .bytes_in_range(start_ix..end_ix)
3297 .flatten()
3298 .copied()
3299 .collect::<Vec<_>>(),
3300 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
3301 "bytes_in_range({:?})",
3302 start_ix..end_ix,
3303 );
3304 }
3305 }
3306
3307 let snapshot = multibuffer.read(cx).snapshot(cx);
3308 for (old_snapshot, subscription) in old_versions {
3309 let edits = subscription.consume().into_inner();
3310
3311 log::info!(
3312 "applying subscription edits to old text: {:?}: {:?}",
3313 old_snapshot.text(),
3314 edits,
3315 );
3316
3317 let mut text = old_snapshot.text();
3318 for edit in edits {
3319 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
3320 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
3321 }
3322 assert_eq!(text.to_string(), snapshot.text());
3323 }
3324 }
3325
3326 #[gpui::test]
3327 fn test_history(cx: &mut MutableAppContext) {
3328 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
3329 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
3330 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3331 let group_interval = multibuffer.read(cx).history.group_interval;
3332 multibuffer.update(cx, |multibuffer, cx| {
3333 multibuffer.push_excerpt(
3334 ExcerptProperties {
3335 buffer: &buffer_1,
3336 range: 0..buffer_1.read(cx).len(),
3337 },
3338 cx,
3339 );
3340 multibuffer.push_excerpt(
3341 ExcerptProperties {
3342 buffer: &buffer_2,
3343 range: 0..buffer_2.read(cx).len(),
3344 },
3345 cx,
3346 );
3347 });
3348
3349 let mut now = Instant::now();
3350
3351 multibuffer.update(cx, |multibuffer, cx| {
3352 multibuffer.start_transaction_at(now, cx);
3353 multibuffer.edit(
3354 [
3355 Point::new(0, 0)..Point::new(0, 0),
3356 Point::new(1, 0)..Point::new(1, 0),
3357 ],
3358 "A",
3359 cx,
3360 );
3361 multibuffer.edit(
3362 [
3363 Point::new(0, 1)..Point::new(0, 1),
3364 Point::new(1, 1)..Point::new(1, 1),
3365 ],
3366 "B",
3367 cx,
3368 );
3369 multibuffer.end_transaction_at(now, cx);
3370 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3371
3372 now += 2 * group_interval;
3373 multibuffer.start_transaction_at(now, cx);
3374 multibuffer.edit([2..2], "C", cx);
3375 multibuffer.end_transaction_at(now, cx);
3376 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3377
3378 multibuffer.undo(cx);
3379 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3380
3381 multibuffer.undo(cx);
3382 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3383
3384 multibuffer.redo(cx);
3385 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3386
3387 multibuffer.redo(cx);
3388 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3389
3390 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
3391 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3392
3393 multibuffer.undo(cx);
3394 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3395
3396 multibuffer.redo(cx);
3397 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3398
3399 multibuffer.redo(cx);
3400 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3401
3402 multibuffer.undo(cx);
3403 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3404
3405 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
3406 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3407
3408 multibuffer.undo(cx);
3409 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
3410 });
3411 }
3412}