1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt};
4use anyhow::Result;
5use clock::ReplicaId;
6use collections::{HashMap, HashSet};
7use gpui::{AppContext, Entity, ModelContext, ModelHandle, Task};
8pub use language::Completion;
9use language::{
10 Buffer, BufferChunks, BufferSnapshot, Chunk, DiagnosticEntry, Event, File, Language, Outline,
11 OutlineItem, Selection, ToOffset as _, ToPoint as _, TransactionId,
12};
13use std::{
14 cell::{Ref, RefCell},
15 cmp, fmt, io,
16 iter::{self, FromIterator},
17 ops::{Range, Sub},
18 str,
19 sync::Arc,
20 time::{Duration, Instant},
21};
22use sum_tree::{Bias, Cursor, SumTree};
23use text::{
24 locator::Locator,
25 rope::TextDimension,
26 subscription::{Subscription, Topic},
27 AnchorRangeExt as _, Edit, Point, PointUtf16, TextSummary,
28};
29use theme::SyntaxTheme;
30use util::post_inc;
31
32const NEWLINES: &'static [u8] = &[b'\n'; u8::MAX as usize];
33
34pub type ExcerptId = Locator;
35
36pub struct MultiBuffer {
37 snapshot: RefCell<MultiBufferSnapshot>,
38 buffers: RefCell<HashMap<usize, BufferState>>,
39 subscriptions: Topic,
40 singleton: bool,
41 replica_id: ReplicaId,
42 history: History,
43}
44
45struct History {
46 next_transaction_id: usize,
47 undo_stack: Vec<Transaction>,
48 redo_stack: Vec<Transaction>,
49 transaction_depth: usize,
50 group_interval: Duration,
51}
52
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 language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
933 self.buffers
934 .borrow()
935 .values()
936 .next()
937 .and_then(|state| state.buffer.read(cx).language())
938 }
939
940 pub fn file<'a>(&self, cx: &'a AppContext) -> Option<&'a dyn File> {
941 self.as_singleton()?.read(cx).file()
942 }
943
944 #[cfg(test)]
945 pub fn is_parsing(&self, cx: &AppContext) -> bool {
946 self.as_singleton().unwrap().read(cx).is_parsing()
947 }
948
949 fn sync(&self, cx: &AppContext) {
950 let mut snapshot = self.snapshot.borrow_mut();
951 let mut excerpts_to_edit = Vec::new();
952 let mut reparsed = false;
953 let mut diagnostics_updated = false;
954 let mut is_dirty = false;
955 let mut has_conflict = false;
956 let mut buffers = self.buffers.borrow_mut();
957 for buffer_state in buffers.values_mut() {
958 let buffer = buffer_state.buffer.read(cx);
959 let version = buffer.version();
960 let parse_count = buffer.parse_count();
961 let selections_update_count = buffer.selections_update_count();
962 let diagnostics_update_count = buffer.diagnostics_update_count();
963
964 let buffer_edited = version.changed_since(&buffer_state.last_version);
965 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
966 let buffer_selections_updated =
967 selections_update_count > buffer_state.last_selections_update_count;
968 let buffer_diagnostics_updated =
969 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
970 if buffer_edited
971 || buffer_reparsed
972 || buffer_selections_updated
973 || buffer_diagnostics_updated
974 {
975 buffer_state.last_version = version;
976 buffer_state.last_parse_count = parse_count;
977 buffer_state.last_selections_update_count = selections_update_count;
978 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
979 excerpts_to_edit.extend(
980 buffer_state
981 .excerpts
982 .iter()
983 .map(|excerpt_id| (excerpt_id, buffer_state.buffer.clone(), buffer_edited)),
984 );
985 }
986
987 reparsed |= buffer_reparsed;
988 diagnostics_updated |= buffer_diagnostics_updated;
989 is_dirty |= buffer.is_dirty();
990 has_conflict |= buffer.has_conflict();
991 }
992 if reparsed {
993 snapshot.parse_count += 1;
994 }
995 if diagnostics_updated {
996 snapshot.diagnostics_update_count += 1;
997 }
998 snapshot.is_dirty = is_dirty;
999 snapshot.has_conflict = has_conflict;
1000
1001 excerpts_to_edit.sort_unstable_by_key(|(excerpt_id, _, _)| *excerpt_id);
1002
1003 let mut edits = Vec::new();
1004 let mut new_excerpts = SumTree::new();
1005 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
1006
1007 for (id, buffer, buffer_edited) in excerpts_to_edit {
1008 new_excerpts.push_tree(cursor.slice(&Some(id), Bias::Left, &()), &());
1009 let old_excerpt = cursor.item().unwrap();
1010 let buffer_id = buffer.id();
1011 let buffer = buffer.read(cx);
1012
1013 let mut new_excerpt;
1014 if buffer_edited {
1015 edits.extend(
1016 buffer
1017 .edits_since_in_range::<usize>(
1018 old_excerpt.buffer.version(),
1019 old_excerpt.range.clone(),
1020 )
1021 .map(|mut edit| {
1022 let excerpt_old_start = cursor.start().1;
1023 let excerpt_new_start = new_excerpts.summary().text.bytes;
1024 edit.old.start += excerpt_old_start;
1025 edit.old.end += excerpt_old_start;
1026 edit.new.start += excerpt_new_start;
1027 edit.new.end += excerpt_new_start;
1028 edit
1029 }),
1030 );
1031
1032 new_excerpt = Excerpt::new(
1033 id.clone(),
1034 buffer_id,
1035 buffer.snapshot(),
1036 old_excerpt.range.clone(),
1037 old_excerpt.has_trailing_newline,
1038 );
1039 } else {
1040 new_excerpt = old_excerpt.clone();
1041 new_excerpt.buffer = buffer.snapshot();
1042 }
1043
1044 new_excerpts.push(new_excerpt, &());
1045 cursor.next(&());
1046 }
1047 new_excerpts.push_tree(cursor.suffix(&()), &());
1048
1049 drop(cursor);
1050 snapshot.excerpts = new_excerpts;
1051
1052 self.subscriptions.publish(edits);
1053 }
1054}
1055
1056#[cfg(any(test, feature = "test-support"))]
1057impl MultiBuffer {
1058 pub fn randomly_edit(
1059 &mut self,
1060 rng: &mut impl rand::Rng,
1061 count: usize,
1062 cx: &mut ModelContext<Self>,
1063 ) {
1064 use text::RandomCharIter;
1065
1066 let snapshot = self.read(cx);
1067 let mut old_ranges: Vec<Range<usize>> = Vec::new();
1068 for _ in 0..count {
1069 let last_end = old_ranges.last().map_or(0, |last_range| last_range.end + 1);
1070 if last_end > snapshot.len() {
1071 break;
1072 }
1073 let end_ix = snapshot.clip_offset(rng.gen_range(0..=last_end), Bias::Right);
1074 let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1075 old_ranges.push(start_ix..end_ix);
1076 }
1077 let new_text_len = rng.gen_range(0..10);
1078 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1079 log::info!("mutating multi-buffer at {:?}: {:?}", old_ranges, new_text);
1080 drop(snapshot);
1081
1082 self.edit(old_ranges.iter().cloned(), new_text.as_str(), cx);
1083 }
1084}
1085
1086impl Entity for MultiBuffer {
1087 type Event = language::Event;
1088}
1089
1090impl MultiBufferSnapshot {
1091 pub fn text(&self) -> String {
1092 self.chunks(0..self.len(), None)
1093 .map(|chunk| chunk.text)
1094 .collect()
1095 }
1096
1097 pub fn reversed_chars_at<'a, T: ToOffset>(
1098 &'a self,
1099 position: T,
1100 ) -> impl Iterator<Item = char> + 'a {
1101 let mut offset = position.to_offset(self);
1102 let mut cursor = self.excerpts.cursor::<usize>();
1103 cursor.seek(&offset, Bias::Left, &());
1104 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1105 let end_before_footer = cursor.start() + excerpt.text_summary.bytes;
1106 let start = excerpt.range.start.to_offset(&excerpt.buffer);
1107 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1108 excerpt.buffer.reversed_chunks_in_range(start..end)
1109 });
1110 iter::from_fn(move || {
1111 if offset == *cursor.start() {
1112 cursor.prev(&());
1113 let excerpt = cursor.item()?;
1114 excerpt_chunks = Some(
1115 excerpt
1116 .buffer
1117 .reversed_chunks_in_range(excerpt.range.clone()),
1118 );
1119 }
1120
1121 let excerpt = cursor.item().unwrap();
1122 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1123 offset -= 1;
1124 Some("\n")
1125 } else {
1126 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1127 offset -= chunk.len();
1128 Some(chunk)
1129 }
1130 })
1131 .flat_map(|c| c.chars().rev())
1132 }
1133
1134 pub fn chars_at<'a, T: ToOffset>(&'a self, position: T) -> impl Iterator<Item = char> + 'a {
1135 let offset = position.to_offset(self);
1136 self.text_for_range(offset..self.len())
1137 .flat_map(|chunk| chunk.chars())
1138 }
1139
1140 pub fn text_for_range<'a, T: ToOffset>(
1141 &'a self,
1142 range: Range<T>,
1143 ) -> impl Iterator<Item = &'a str> {
1144 self.chunks(range, None).map(|chunk| chunk.text)
1145 }
1146
1147 pub fn is_line_blank(&self, row: u32) -> bool {
1148 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1149 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1150 }
1151
1152 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1153 where
1154 T: ToOffset,
1155 {
1156 let position = position.to_offset(self);
1157 position == self.clip_offset(position, Bias::Left)
1158 && self
1159 .bytes_in_range(position..self.len())
1160 .flatten()
1161 .copied()
1162 .take(needle.len())
1163 .eq(needle.bytes())
1164 }
1165
1166 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
1167 let mut start = start.to_offset(self);
1168 let mut end = start;
1169 let mut next_chars = self.chars_at(start).peekable();
1170 let mut prev_chars = self.reversed_chars_at(start).peekable();
1171 let word_kind = cmp::max(
1172 prev_chars.peek().copied().map(char_kind),
1173 next_chars.peek().copied().map(char_kind),
1174 );
1175
1176 for ch in prev_chars {
1177 if Some(char_kind(ch)) == word_kind {
1178 start -= ch.len_utf8();
1179 } else {
1180 break;
1181 }
1182 }
1183
1184 for ch in next_chars {
1185 if Some(char_kind(ch)) == word_kind {
1186 end += ch.len_utf8();
1187 } else {
1188 break;
1189 }
1190 }
1191
1192 (start..end, word_kind)
1193 }
1194
1195 fn as_singleton(&self) -> Option<&Excerpt> {
1196 if self.singleton {
1197 self.excerpts.iter().next()
1198 } else {
1199 None
1200 }
1201 }
1202
1203 pub fn len(&self) -> usize {
1204 self.excerpts.summary().text.bytes
1205 }
1206
1207 pub fn max_buffer_row(&self) -> u32 {
1208 self.excerpts.summary().max_buffer_row
1209 }
1210
1211 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1212 if let Some(excerpt) = self.as_singleton() {
1213 return excerpt.buffer.clip_offset(offset, bias);
1214 }
1215
1216 let mut cursor = self.excerpts.cursor::<usize>();
1217 cursor.seek(&offset, Bias::Right, &());
1218 let overshoot = if let Some(excerpt) = cursor.item() {
1219 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1220 let buffer_offset = excerpt
1221 .buffer
1222 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1223 buffer_offset.saturating_sub(excerpt_start)
1224 } else {
1225 0
1226 };
1227 cursor.start() + overshoot
1228 }
1229
1230 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1231 if let Some(excerpt) = self.as_singleton() {
1232 return excerpt.buffer.clip_point(point, bias);
1233 }
1234
1235 let mut cursor = self.excerpts.cursor::<Point>();
1236 cursor.seek(&point, Bias::Right, &());
1237 let overshoot = if let Some(excerpt) = cursor.item() {
1238 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1239 let buffer_point = excerpt
1240 .buffer
1241 .clip_point(excerpt_start + (point - cursor.start()), bias);
1242 buffer_point.saturating_sub(excerpt_start)
1243 } else {
1244 Point::zero()
1245 };
1246 *cursor.start() + overshoot
1247 }
1248
1249 pub fn clip_point_utf16(&self, point: PointUtf16, bias: Bias) -> PointUtf16 {
1250 if let Some(excerpt) = self.as_singleton() {
1251 return excerpt.buffer.clip_point_utf16(point, bias);
1252 }
1253
1254 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1255 cursor.seek(&point, Bias::Right, &());
1256 let overshoot = if let Some(excerpt) = cursor.item() {
1257 let excerpt_start = excerpt
1258 .buffer
1259 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1260 let buffer_point = excerpt
1261 .buffer
1262 .clip_point_utf16(excerpt_start + (point - cursor.start()), bias);
1263 buffer_point.saturating_sub(excerpt_start)
1264 } else {
1265 PointUtf16::zero()
1266 };
1267 *cursor.start() + overshoot
1268 }
1269
1270 pub fn bytes_in_range<'a, T: ToOffset>(&'a self, range: Range<T>) -> MultiBufferBytes<'a> {
1271 let range = range.start.to_offset(self)..range.end.to_offset(self);
1272 let mut excerpts = self.excerpts.cursor::<usize>();
1273 excerpts.seek(&range.start, Bias::Right, &());
1274
1275 let mut chunk = &[][..];
1276 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1277 let mut excerpt_bytes = excerpt
1278 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1279 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1280 Some(excerpt_bytes)
1281 } else {
1282 None
1283 };
1284
1285 MultiBufferBytes {
1286 range,
1287 excerpts,
1288 excerpt_bytes,
1289 chunk,
1290 }
1291 }
1292
1293 pub fn buffer_rows<'a>(&'a self, start_row: u32) -> MultiBufferRows<'a> {
1294 let mut result = MultiBufferRows {
1295 buffer_row_range: 0..0,
1296 excerpts: self.excerpts.cursor(),
1297 };
1298 result.seek(start_row);
1299 result
1300 }
1301
1302 pub fn chunks<'a, T: ToOffset>(
1303 &'a self,
1304 range: Range<T>,
1305 theme: Option<&'a SyntaxTheme>,
1306 ) -> MultiBufferChunks<'a> {
1307 let range = range.start.to_offset(self)..range.end.to_offset(self);
1308 let mut chunks = MultiBufferChunks {
1309 range: range.clone(),
1310 excerpts: self.excerpts.cursor(),
1311 excerpt_chunks: None,
1312 theme,
1313 };
1314 chunks.seek(range.start);
1315 chunks
1316 }
1317
1318 pub fn offset_to_point(&self, offset: usize) -> Point {
1319 if let Some(excerpt) = self.as_singleton() {
1320 return excerpt.buffer.offset_to_point(offset);
1321 }
1322
1323 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1324 cursor.seek(&offset, Bias::Right, &());
1325 if let Some(excerpt) = cursor.item() {
1326 let (start_offset, start_point) = cursor.start();
1327 let overshoot = offset - start_offset;
1328 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1329 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1330 let buffer_point = excerpt
1331 .buffer
1332 .offset_to_point(excerpt_start_offset + overshoot);
1333 *start_point + (buffer_point - excerpt_start_point)
1334 } else {
1335 self.excerpts.summary().text.lines
1336 }
1337 }
1338
1339 pub fn point_to_offset(&self, point: Point) -> usize {
1340 if let Some(excerpt) = self.as_singleton() {
1341 return excerpt.buffer.point_to_offset(point);
1342 }
1343
1344 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1345 cursor.seek(&point, Bias::Right, &());
1346 if let Some(excerpt) = cursor.item() {
1347 let (start_point, start_offset) = cursor.start();
1348 let overshoot = point - start_point;
1349 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1350 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1351 let buffer_offset = excerpt
1352 .buffer
1353 .point_to_offset(excerpt_start_point + overshoot);
1354 *start_offset + buffer_offset - excerpt_start_offset
1355 } else {
1356 self.excerpts.summary().text.bytes
1357 }
1358 }
1359
1360 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1361 if let Some(excerpt) = self.as_singleton() {
1362 return excerpt.buffer.point_utf16_to_offset(point);
1363 }
1364
1365 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1366 cursor.seek(&point, Bias::Right, &());
1367 if let Some(excerpt) = cursor.item() {
1368 let (start_point, start_offset) = cursor.start();
1369 let overshoot = point - start_point;
1370 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1371 let excerpt_start_point = excerpt
1372 .buffer
1373 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1374 let buffer_offset = excerpt
1375 .buffer
1376 .point_utf16_to_offset(excerpt_start_point + overshoot);
1377 *start_offset + (buffer_offset - excerpt_start_offset)
1378 } else {
1379 self.excerpts.summary().text.bytes
1380 }
1381 }
1382
1383 pub fn indent_column_for_line(&self, row: u32) -> u32 {
1384 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
1385 buffer
1386 .indent_column_for_line(range.start.row)
1387 .min(range.end.column)
1388 .saturating_sub(range.start.column)
1389 } else {
1390 0
1391 }
1392 }
1393
1394 pub fn line_len(&self, row: u32) -> u32 {
1395 if let Some((_, range)) = self.buffer_line_for_row(row) {
1396 range.end.column - range.start.column
1397 } else {
1398 0
1399 }
1400 }
1401
1402 fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
1403 let mut cursor = self.excerpts.cursor::<Point>();
1404 cursor.seek(&Point::new(row, 0), Bias::Right, &());
1405 if let Some(excerpt) = cursor.item() {
1406 let overshoot = row - cursor.start().row;
1407 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1408 let excerpt_end = excerpt.range.end.to_point(&excerpt.buffer);
1409 let buffer_row = excerpt_start.row + overshoot;
1410 let line_start = Point::new(buffer_row, 0);
1411 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
1412 return Some((
1413 &excerpt.buffer,
1414 line_start.max(excerpt_start)..line_end.min(excerpt_end),
1415 ));
1416 }
1417 None
1418 }
1419
1420 pub fn max_point(&self) -> Point {
1421 self.text_summary().lines
1422 }
1423
1424 pub fn text_summary(&self) -> TextSummary {
1425 self.excerpts.summary().text
1426 }
1427
1428 pub fn text_summary_for_range<'a, D, O>(&'a self, range: Range<O>) -> D
1429 where
1430 D: TextDimension,
1431 O: ToOffset,
1432 {
1433 let mut summary = D::default();
1434 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1435 let mut cursor = self.excerpts.cursor::<usize>();
1436 cursor.seek(&range.start, Bias::Right, &());
1437 if let Some(excerpt) = cursor.item() {
1438 let mut end_before_newline = cursor.end(&());
1439 if excerpt.has_trailing_newline {
1440 end_before_newline -= 1;
1441 }
1442
1443 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1444 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
1445 let end_in_excerpt =
1446 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
1447 summary.add_assign(
1448 &excerpt
1449 .buffer
1450 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
1451 );
1452
1453 if range.end > end_before_newline {
1454 summary.add_assign(&D::from_text_summary(&TextSummary {
1455 bytes: 1,
1456 lines: Point::new(1 as u32, 0),
1457 lines_utf16: PointUtf16::new(1 as u32, 0),
1458 first_line_chars: 0,
1459 last_line_chars: 0,
1460 longest_row: 0,
1461 longest_row_chars: 0,
1462 }));
1463 }
1464
1465 cursor.next(&());
1466 }
1467
1468 if range.end > *cursor.start() {
1469 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
1470 &range.end,
1471 Bias::Right,
1472 &(),
1473 )));
1474 if let Some(excerpt) = cursor.item() {
1475 range.end = cmp::max(*cursor.start(), range.end);
1476
1477 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1478 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
1479 summary.add_assign(
1480 &excerpt
1481 .buffer
1482 .text_summary_for_range(excerpt_start..end_in_excerpt),
1483 );
1484 }
1485 }
1486
1487 summary
1488 }
1489
1490 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
1491 where
1492 D: TextDimension + Ord + Sub<D, Output = D>,
1493 {
1494 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1495 cursor.seek(&Some(&anchor.excerpt_id), Bias::Left, &());
1496 if cursor.item().is_none() {
1497 cursor.next(&());
1498 }
1499
1500 let mut position = D::from_text_summary(&cursor.start().text);
1501 if let Some(excerpt) = cursor.item() {
1502 if excerpt.id == anchor.excerpt_id && excerpt.buffer_id == anchor.buffer_id {
1503 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1504 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1505 let buffer_position = cmp::min(
1506 excerpt_buffer_end,
1507 anchor.text_anchor.summary::<D>(&excerpt.buffer),
1508 );
1509 if buffer_position > excerpt_buffer_start {
1510 position.add_assign(&(buffer_position - excerpt_buffer_start));
1511 }
1512 }
1513 }
1514 position
1515 }
1516
1517 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
1518 where
1519 D: TextDimension + Ord + Sub<D, Output = D>,
1520 I: 'a + IntoIterator<Item = &'a Anchor>,
1521 {
1522 let mut anchors = anchors.into_iter().peekable();
1523 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1524 let mut summaries = Vec::new();
1525 while let Some(anchor) = anchors.peek() {
1526 let excerpt_id = &anchor.excerpt_id;
1527 let buffer_id = anchor.buffer_id;
1528 let excerpt_anchors = iter::from_fn(|| {
1529 let anchor = anchors.peek()?;
1530 if anchor.excerpt_id == *excerpt_id && anchor.buffer_id == buffer_id {
1531 Some(&anchors.next().unwrap().text_anchor)
1532 } else {
1533 None
1534 }
1535 });
1536
1537 cursor.seek_forward(&Some(excerpt_id), Bias::Left, &());
1538 if cursor.item().is_none() {
1539 cursor.next(&());
1540 }
1541
1542 let position = D::from_text_summary(&cursor.start().text);
1543 if let Some(excerpt) = cursor.item() {
1544 if excerpt.id == *excerpt_id && excerpt.buffer_id == buffer_id {
1545 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1546 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1547 summaries.extend(
1548 excerpt
1549 .buffer
1550 .summaries_for_anchors::<D, _>(excerpt_anchors)
1551 .map(move |summary| {
1552 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
1553 let mut position = position.clone();
1554 let excerpt_buffer_start = excerpt_buffer_start.clone();
1555 if summary > excerpt_buffer_start {
1556 position.add_assign(&(summary - excerpt_buffer_start));
1557 }
1558 position
1559 }),
1560 );
1561 continue;
1562 }
1563 }
1564
1565 summaries.extend(excerpt_anchors.map(|_| position.clone()));
1566 }
1567
1568 summaries
1569 }
1570
1571 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
1572 where
1573 I: 'a + IntoIterator<Item = &'a Anchor>,
1574 {
1575 let mut anchors = anchors.into_iter().enumerate().peekable();
1576 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1577 let mut result = Vec::new();
1578 while let Some((_, anchor)) = anchors.peek() {
1579 let old_excerpt_id = &anchor.excerpt_id;
1580
1581 // Find the location where this anchor's excerpt should be.
1582 cursor.seek_forward(&Some(old_excerpt_id), Bias::Left, &());
1583 if cursor.item().is_none() {
1584 cursor.next(&());
1585 }
1586
1587 let next_excerpt = cursor.item();
1588 let prev_excerpt = cursor.prev_item();
1589
1590 // Process all of the anchors for this excerpt.
1591 while let Some((_, anchor)) = anchors.peek() {
1592 if anchor.excerpt_id != *old_excerpt_id {
1593 break;
1594 }
1595 let mut kept_position = false;
1596 let (anchor_ix, anchor) = anchors.next().unwrap();
1597 let mut anchor = anchor.clone();
1598
1599 // Leave min and max anchors unchanged.
1600 if *old_excerpt_id == ExcerptId::max() || *old_excerpt_id == ExcerptId::min() {
1601 kept_position = true;
1602 }
1603 // If the old excerpt still exists at this location, then leave
1604 // the anchor unchanged.
1605 else if next_excerpt.map_or(false, |excerpt| {
1606 excerpt.id == *old_excerpt_id && excerpt.contains(&anchor)
1607 }) {
1608 kept_position = true;
1609 }
1610 // If the old excerpt no longer exists at this location, then attempt to
1611 // find an equivalent position for this anchor in an adjacent excerpt.
1612 else {
1613 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
1614 if excerpt.contains(&anchor) {
1615 anchor.excerpt_id = excerpt.id.clone();
1616 kept_position = true;
1617 break;
1618 }
1619 }
1620 }
1621 // If there's no adjacent excerpt that contains the anchor's position,
1622 // then report that the anchor has lost its position.
1623 if !kept_position {
1624 anchor = if let Some(excerpt) = next_excerpt {
1625 let mut text_anchor = excerpt
1626 .range
1627 .start
1628 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1629 if text_anchor
1630 .cmp(&excerpt.range.end, &excerpt.buffer)
1631 .unwrap()
1632 .is_gt()
1633 {
1634 text_anchor = excerpt.range.end.clone();
1635 }
1636 Anchor {
1637 buffer_id: excerpt.buffer_id,
1638 excerpt_id: excerpt.id.clone(),
1639 text_anchor,
1640 }
1641 } else if let Some(excerpt) = prev_excerpt {
1642 let mut text_anchor = excerpt
1643 .range
1644 .end
1645 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1646 if text_anchor
1647 .cmp(&excerpt.range.start, &excerpt.buffer)
1648 .unwrap()
1649 .is_lt()
1650 {
1651 text_anchor = excerpt.range.start.clone();
1652 }
1653 Anchor {
1654 buffer_id: excerpt.buffer_id,
1655 excerpt_id: excerpt.id.clone(),
1656 text_anchor,
1657 }
1658 } else if anchor.text_anchor.bias == Bias::Left {
1659 Anchor::min()
1660 } else {
1661 Anchor::max()
1662 };
1663 }
1664
1665 result.push((anchor_ix, anchor, kept_position));
1666 }
1667 }
1668 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self).unwrap());
1669 result
1670 }
1671
1672 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
1673 self.anchor_at(position, Bias::Left)
1674 }
1675
1676 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
1677 self.anchor_at(position, Bias::Right)
1678 }
1679
1680 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
1681 let offset = position.to_offset(self);
1682 if let Some(excerpt) = self.as_singleton() {
1683 return Anchor {
1684 buffer_id: excerpt.buffer_id,
1685 excerpt_id: excerpt.id.clone(),
1686 text_anchor: excerpt.buffer.anchor_at(offset, bias),
1687 };
1688 }
1689
1690 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1691 cursor.seek(&offset, Bias::Right, &());
1692 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
1693 cursor.prev(&());
1694 }
1695 if let Some(excerpt) = cursor.item() {
1696 let mut overshoot = offset.saturating_sub(cursor.start().0);
1697 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
1698 overshoot -= 1;
1699 bias = Bias::Right;
1700 }
1701
1702 let buffer_start = excerpt.range.start.to_offset(&excerpt.buffer);
1703 let text_anchor =
1704 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
1705 Anchor {
1706 buffer_id: excerpt.buffer_id,
1707 excerpt_id: excerpt.id.clone(),
1708 text_anchor,
1709 }
1710 } else if offset == 0 && bias == Bias::Left {
1711 Anchor::min()
1712 } else {
1713 Anchor::max()
1714 }
1715 }
1716
1717 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
1718 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1719 cursor.seek(&Some(&excerpt_id), Bias::Left, &());
1720 if let Some(excerpt) = cursor.item() {
1721 if excerpt.id == excerpt_id {
1722 let text_anchor = excerpt.clip_anchor(text_anchor);
1723 drop(cursor);
1724 return Anchor {
1725 buffer_id: excerpt.buffer_id,
1726 excerpt_id,
1727 text_anchor,
1728 };
1729 }
1730 }
1731 panic!("excerpt not found");
1732 }
1733
1734 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
1735 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
1736 true
1737 } else if let Some((buffer_id, buffer_snapshot)) =
1738 self.buffer_snapshot_for_excerpt(&anchor.excerpt_id)
1739 {
1740 anchor.buffer_id == buffer_id && buffer_snapshot.can_resolve(&anchor.text_anchor)
1741 } else {
1742 false
1743 }
1744 }
1745
1746 pub fn range_contains_excerpt_boundary<T: ToOffset>(&self, range: Range<T>) -> bool {
1747 let start = range.start.to_offset(self);
1748 let end = range.end.to_offset(self);
1749 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1750 cursor.seek(&start, Bias::Right, &());
1751 let start_id = cursor
1752 .item()
1753 .or_else(|| cursor.prev_item())
1754 .map(|excerpt| &excerpt.id);
1755 cursor.seek_forward(&end, Bias::Right, &());
1756 let end_id = cursor
1757 .item()
1758 .or_else(|| cursor.prev_item())
1759 .map(|excerpt| &excerpt.id);
1760 start_id != end_id
1761 }
1762
1763 pub fn parse_count(&self) -> usize {
1764 self.parse_count
1765 }
1766
1767 pub fn enclosing_bracket_ranges<T: ToOffset>(
1768 &self,
1769 range: Range<T>,
1770 ) -> Option<(Range<usize>, Range<usize>)> {
1771 let range = range.start.to_offset(self)..range.end.to_offset(self);
1772
1773 let mut cursor = self.excerpts.cursor::<usize>();
1774 cursor.seek(&range.start, Bias::Right, &());
1775 let start_excerpt = cursor.item();
1776
1777 cursor.seek(&range.end, Bias::Right, &());
1778 let end_excerpt = cursor.item();
1779
1780 start_excerpt
1781 .zip(end_excerpt)
1782 .and_then(|(start_excerpt, end_excerpt)| {
1783 if start_excerpt.id != end_excerpt.id {
1784 return None;
1785 }
1786
1787 let excerpt_buffer_start =
1788 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1789 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1790
1791 let start_in_buffer =
1792 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1793 let end_in_buffer =
1794 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1795 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
1796 .buffer
1797 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
1798
1799 if start_bracket_range.start >= excerpt_buffer_start
1800 && end_bracket_range.end < excerpt_buffer_end
1801 {
1802 start_bracket_range.start =
1803 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
1804 start_bracket_range.end =
1805 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
1806 end_bracket_range.start =
1807 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
1808 end_bracket_range.end =
1809 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
1810 Some((start_bracket_range, end_bracket_range))
1811 } else {
1812 None
1813 }
1814 })
1815 }
1816
1817 pub fn diagnostics_update_count(&self) -> usize {
1818 self.diagnostics_update_count
1819 }
1820
1821 pub fn language(&self) -> Option<&Arc<Language>> {
1822 self.excerpts
1823 .iter()
1824 .next()
1825 .and_then(|excerpt| excerpt.buffer.language())
1826 }
1827
1828 pub fn is_dirty(&self) -> bool {
1829 self.is_dirty
1830 }
1831
1832 pub fn has_conflict(&self) -> bool {
1833 self.has_conflict
1834 }
1835
1836 pub fn diagnostic_group<'a, O>(
1837 &'a self,
1838 group_id: usize,
1839 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1840 where
1841 O: text::FromAnchor + 'a,
1842 {
1843 self.as_singleton()
1844 .into_iter()
1845 .flat_map(move |excerpt| excerpt.buffer.diagnostic_group(group_id))
1846 }
1847
1848 pub fn diagnostics_in_range<'a, T, O>(
1849 &'a self,
1850 range: Range<T>,
1851 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1852 where
1853 T: 'a + ToOffset,
1854 O: 'a + text::FromAnchor,
1855 {
1856 self.as_singleton().into_iter().flat_map(move |excerpt| {
1857 excerpt
1858 .buffer
1859 .diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1860 })
1861 }
1862
1863 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1864 let range = range.start.to_offset(self)..range.end.to_offset(self);
1865
1866 let mut cursor = self.excerpts.cursor::<usize>();
1867 cursor.seek(&range.start, Bias::Right, &());
1868 let start_excerpt = cursor.item();
1869
1870 cursor.seek(&range.end, Bias::Right, &());
1871 let end_excerpt = cursor.item();
1872
1873 start_excerpt
1874 .zip(end_excerpt)
1875 .and_then(|(start_excerpt, end_excerpt)| {
1876 if start_excerpt.id != end_excerpt.id {
1877 return None;
1878 }
1879
1880 let excerpt_buffer_start =
1881 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1882 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1883
1884 let start_in_buffer =
1885 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1886 let end_in_buffer =
1887 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1888 let mut ancestor_buffer_range = start_excerpt
1889 .buffer
1890 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1891 ancestor_buffer_range.start =
1892 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1893 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1894
1895 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1896 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1897 Some(start..end)
1898 })
1899 }
1900
1901 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
1902 let excerpt = self.as_singleton()?;
1903 let outline = excerpt.buffer.outline(theme)?;
1904 Some(Outline::new(
1905 outline
1906 .items
1907 .into_iter()
1908 .map(|item| OutlineItem {
1909 depth: item.depth,
1910 range: self.anchor_in_excerpt(excerpt.id.clone(), item.range.start)
1911 ..self.anchor_in_excerpt(excerpt.id.clone(), item.range.end),
1912 text: item.text,
1913 highlight_ranges: item.highlight_ranges,
1914 name_ranges: item.name_ranges,
1915 })
1916 .collect(),
1917 ))
1918 }
1919
1920 fn buffer_snapshot_for_excerpt<'a>(
1921 &'a self,
1922 excerpt_id: &'a ExcerptId,
1923 ) -> Option<(usize, &'a BufferSnapshot)> {
1924 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1925 cursor.seek(&Some(excerpt_id), Bias::Left, &());
1926 if let Some(excerpt) = cursor.item() {
1927 if excerpt.id == *excerpt_id {
1928 return Some((excerpt.buffer_id, &excerpt.buffer));
1929 }
1930 }
1931 None
1932 }
1933
1934 pub fn remote_selections_in_range<'a>(
1935 &'a self,
1936 range: &'a Range<Anchor>,
1937 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
1938 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1939 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
1940 cursor
1941 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
1942 .flat_map(move |excerpt| {
1943 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
1944 if excerpt.id == range.start.excerpt_id {
1945 query_range.start = range.start.text_anchor.clone();
1946 }
1947 if excerpt.id == range.end.excerpt_id {
1948 query_range.end = range.end.text_anchor.clone();
1949 }
1950
1951 excerpt
1952 .buffer
1953 .remote_selections_in_range(query_range)
1954 .flat_map(move |(replica_id, selections)| {
1955 selections.map(move |selection| {
1956 let mut start = Anchor {
1957 buffer_id: excerpt.buffer_id,
1958 excerpt_id: excerpt.id.clone(),
1959 text_anchor: selection.start.clone(),
1960 };
1961 let mut end = Anchor {
1962 buffer_id: excerpt.buffer_id,
1963 excerpt_id: excerpt.id.clone(),
1964 text_anchor: selection.end.clone(),
1965 };
1966 if range.start.cmp(&start, self).unwrap().is_gt() {
1967 start = range.start.clone();
1968 }
1969 if range.end.cmp(&end, self).unwrap().is_lt() {
1970 end = range.end.clone();
1971 }
1972
1973 (
1974 replica_id,
1975 Selection {
1976 id: selection.id,
1977 start,
1978 end,
1979 reversed: selection.reversed,
1980 goal: selection.goal,
1981 },
1982 )
1983 })
1984 })
1985 })
1986 }
1987}
1988
1989impl History {
1990 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
1991 self.transaction_depth += 1;
1992 if self.transaction_depth == 1 {
1993 let id = post_inc(&mut self.next_transaction_id);
1994 self.undo_stack.push(Transaction {
1995 id,
1996 buffer_transactions: Default::default(),
1997 first_edit_at: now,
1998 last_edit_at: now,
1999 });
2000 Some(id)
2001 } else {
2002 None
2003 }
2004 }
2005
2006 fn end_transaction(
2007 &mut self,
2008 now: Instant,
2009 buffer_transactions: HashSet<(usize, TransactionId)>,
2010 ) -> bool {
2011 assert_ne!(self.transaction_depth, 0);
2012 self.transaction_depth -= 1;
2013 if self.transaction_depth == 0 {
2014 if buffer_transactions.is_empty() {
2015 self.undo_stack.pop();
2016 false
2017 } else {
2018 let transaction = self.undo_stack.last_mut().unwrap();
2019 transaction.last_edit_at = now;
2020 transaction.buffer_transactions.extend(buffer_transactions);
2021 true
2022 }
2023 } else {
2024 false
2025 }
2026 }
2027
2028 fn pop_undo(&mut self) -> Option<&Transaction> {
2029 assert_eq!(self.transaction_depth, 0);
2030 if let Some(transaction) = self.undo_stack.pop() {
2031 self.redo_stack.push(transaction);
2032 self.redo_stack.last()
2033 } else {
2034 None
2035 }
2036 }
2037
2038 fn pop_redo(&mut self) -> Option<&Transaction> {
2039 assert_eq!(self.transaction_depth, 0);
2040 if let Some(transaction) = self.redo_stack.pop() {
2041 self.undo_stack.push(transaction);
2042 self.undo_stack.last()
2043 } else {
2044 None
2045 }
2046 }
2047
2048 fn group(&mut self) -> Option<TransactionId> {
2049 let mut new_len = self.undo_stack.len();
2050 let mut transactions = self.undo_stack.iter_mut();
2051
2052 if let Some(mut transaction) = transactions.next_back() {
2053 while let Some(prev_transaction) = transactions.next_back() {
2054 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
2055 {
2056 transaction = prev_transaction;
2057 new_len -= 1;
2058 } else {
2059 break;
2060 }
2061 }
2062 }
2063
2064 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
2065 if let Some(last_transaction) = transactions_to_keep.last_mut() {
2066 if let Some(transaction) = transactions_to_merge.last() {
2067 last_transaction.last_edit_at = transaction.last_edit_at;
2068 }
2069 }
2070
2071 self.undo_stack.truncate(new_len);
2072 self.undo_stack.last().map(|t| t.id)
2073 }
2074}
2075
2076impl Excerpt {
2077 fn new(
2078 id: ExcerptId,
2079 buffer_id: usize,
2080 buffer: BufferSnapshot,
2081 range: Range<text::Anchor>,
2082 has_trailing_newline: bool,
2083 ) -> Self {
2084 Excerpt {
2085 id,
2086 max_buffer_row: range.end.to_point(&buffer).row,
2087 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
2088 buffer_id,
2089 buffer,
2090 range,
2091 has_trailing_newline,
2092 }
2093 }
2094
2095 fn chunks_in_range<'a>(
2096 &'a self,
2097 range: Range<usize>,
2098 theme: Option<&'a SyntaxTheme>,
2099 ) -> ExcerptChunks<'a> {
2100 let content_start = self.range.start.to_offset(&self.buffer);
2101 let chunks_start = content_start + range.start;
2102 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2103
2104 let footer_height = if self.has_trailing_newline
2105 && range.start <= self.text_summary.bytes
2106 && range.end > self.text_summary.bytes
2107 {
2108 1
2109 } else {
2110 0
2111 };
2112
2113 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
2114
2115 ExcerptChunks {
2116 content_chunks,
2117 footer_height,
2118 }
2119 }
2120
2121 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
2122 let content_start = self.range.start.to_offset(&self.buffer);
2123 let bytes_start = content_start + range.start;
2124 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2125 let footer_height = if self.has_trailing_newline
2126 && range.start <= self.text_summary.bytes
2127 && range.end > self.text_summary.bytes
2128 {
2129 1
2130 } else {
2131 0
2132 };
2133 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
2134
2135 ExcerptBytes {
2136 content_bytes,
2137 footer_height,
2138 }
2139 }
2140
2141 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
2142 if text_anchor
2143 .cmp(&self.range.start, &self.buffer)
2144 .unwrap()
2145 .is_lt()
2146 {
2147 self.range.start.clone()
2148 } else if text_anchor
2149 .cmp(&self.range.end, &self.buffer)
2150 .unwrap()
2151 .is_gt()
2152 {
2153 self.range.end.clone()
2154 } else {
2155 text_anchor
2156 }
2157 }
2158
2159 fn contains(&self, anchor: &Anchor) -> bool {
2160 self.buffer_id == anchor.buffer_id
2161 && self
2162 .range
2163 .start
2164 .cmp(&anchor.text_anchor, &self.buffer)
2165 .unwrap()
2166 .is_le()
2167 && self
2168 .range
2169 .end
2170 .cmp(&anchor.text_anchor, &self.buffer)
2171 .unwrap()
2172 .is_ge()
2173 }
2174}
2175
2176impl fmt::Debug for Excerpt {
2177 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2178 f.debug_struct("Excerpt")
2179 .field("id", &self.id)
2180 .field("buffer_id", &self.buffer_id)
2181 .field("range", &self.range)
2182 .field("text_summary", &self.text_summary)
2183 .field("has_trailing_newline", &self.has_trailing_newline)
2184 .finish()
2185 }
2186}
2187
2188impl sum_tree::Item for Excerpt {
2189 type Summary = ExcerptSummary;
2190
2191 fn summary(&self) -> Self::Summary {
2192 let mut text = self.text_summary.clone();
2193 if self.has_trailing_newline {
2194 text += TextSummary::from("\n");
2195 }
2196 ExcerptSummary {
2197 excerpt_id: self.id.clone(),
2198 max_buffer_row: self.max_buffer_row,
2199 text,
2200 }
2201 }
2202}
2203
2204impl sum_tree::Summary for ExcerptSummary {
2205 type Context = ();
2206
2207 fn add_summary(&mut self, summary: &Self, _: &()) {
2208 debug_assert!(summary.excerpt_id > self.excerpt_id);
2209 self.excerpt_id = summary.excerpt_id.clone();
2210 self.text.add_summary(&summary.text, &());
2211 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
2212 }
2213}
2214
2215impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
2216 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2217 *self += &summary.text;
2218 }
2219}
2220
2221impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
2222 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2223 *self += summary.text.bytes;
2224 }
2225}
2226
2227impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
2228 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2229 Ord::cmp(self, &cursor_location.text.bytes)
2230 }
2231}
2232
2233impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
2234 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2235 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
2236 }
2237}
2238
2239impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
2240 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2241 *self += summary.text.lines;
2242 }
2243}
2244
2245impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
2246 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2247 *self += summary.text.lines_utf16
2248 }
2249}
2250
2251impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
2252 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2253 *self = Some(&summary.excerpt_id);
2254 }
2255}
2256
2257impl<'a> MultiBufferRows<'a> {
2258 pub fn seek(&mut self, row: u32) {
2259 self.buffer_row_range = 0..0;
2260
2261 self.excerpts
2262 .seek_forward(&Point::new(row, 0), Bias::Right, &());
2263 if self.excerpts.item().is_none() {
2264 self.excerpts.prev(&());
2265
2266 if self.excerpts.item().is_none() && row == 0 {
2267 self.buffer_row_range = 0..1;
2268 return;
2269 }
2270 }
2271
2272 if let Some(excerpt) = self.excerpts.item() {
2273 let overshoot = row - self.excerpts.start().row;
2274 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
2275 self.buffer_row_range.start = excerpt_start + overshoot;
2276 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
2277 }
2278 }
2279}
2280
2281impl<'a> Iterator for MultiBufferRows<'a> {
2282 type Item = Option<u32>;
2283
2284 fn next(&mut self) -> Option<Self::Item> {
2285 loop {
2286 if !self.buffer_row_range.is_empty() {
2287 let row = Some(self.buffer_row_range.start);
2288 self.buffer_row_range.start += 1;
2289 return Some(row);
2290 }
2291 self.excerpts.item()?;
2292 self.excerpts.next(&());
2293 let excerpt = self.excerpts.item()?;
2294 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
2295 self.buffer_row_range.end =
2296 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
2297 }
2298 }
2299}
2300
2301impl<'a> MultiBufferChunks<'a> {
2302 pub fn offset(&self) -> usize {
2303 self.range.start
2304 }
2305
2306 pub fn seek(&mut self, offset: usize) {
2307 self.range.start = offset;
2308 self.excerpts.seek(&offset, Bias::Right, &());
2309 if let Some(excerpt) = self.excerpts.item() {
2310 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2311 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
2312 self.theme,
2313 ));
2314 } else {
2315 self.excerpt_chunks = None;
2316 }
2317 }
2318}
2319
2320impl<'a> Iterator for MultiBufferChunks<'a> {
2321 type Item = Chunk<'a>;
2322
2323 fn next(&mut self) -> Option<Self::Item> {
2324 if self.range.is_empty() {
2325 None
2326 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
2327 self.range.start += chunk.text.len();
2328 Some(chunk)
2329 } else {
2330 self.excerpts.next(&());
2331 let excerpt = self.excerpts.item()?;
2332 self.excerpt_chunks = Some(
2333 excerpt.chunks_in_range(0..self.range.end - self.excerpts.start(), self.theme),
2334 );
2335 self.next()
2336 }
2337 }
2338}
2339
2340impl<'a> MultiBufferBytes<'a> {
2341 fn consume(&mut self, len: usize) {
2342 self.range.start += len;
2343 self.chunk = &self.chunk[len..];
2344
2345 if !self.range.is_empty() && self.chunk.is_empty() {
2346 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
2347 self.chunk = chunk;
2348 } else {
2349 self.excerpts.next(&());
2350 if let Some(excerpt) = self.excerpts.item() {
2351 let mut excerpt_bytes =
2352 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
2353 self.chunk = excerpt_bytes.next().unwrap();
2354 self.excerpt_bytes = Some(excerpt_bytes);
2355 }
2356 }
2357 }
2358 }
2359}
2360
2361impl<'a> Iterator for MultiBufferBytes<'a> {
2362 type Item = &'a [u8];
2363
2364 fn next(&mut self) -> Option<Self::Item> {
2365 let chunk = self.chunk;
2366 if chunk.is_empty() {
2367 None
2368 } else {
2369 self.consume(chunk.len());
2370 Some(chunk)
2371 }
2372 }
2373}
2374
2375impl<'a> io::Read for MultiBufferBytes<'a> {
2376 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2377 let len = cmp::min(buf.len(), self.chunk.len());
2378 buf[..len].copy_from_slice(&self.chunk[..len]);
2379 if len > 0 {
2380 self.consume(len);
2381 }
2382 Ok(len)
2383 }
2384}
2385
2386impl<'a> Iterator for ExcerptBytes<'a> {
2387 type Item = &'a [u8];
2388
2389 fn next(&mut self) -> Option<Self::Item> {
2390 if let Some(chunk) = self.content_bytes.next() {
2391 if !chunk.is_empty() {
2392 return Some(chunk);
2393 }
2394 }
2395
2396 if self.footer_height > 0 {
2397 let result = &NEWLINES[..self.footer_height];
2398 self.footer_height = 0;
2399 return Some(result);
2400 }
2401
2402 None
2403 }
2404}
2405
2406impl<'a> Iterator for ExcerptChunks<'a> {
2407 type Item = Chunk<'a>;
2408
2409 fn next(&mut self) -> Option<Self::Item> {
2410 if let Some(chunk) = self.content_chunks.next() {
2411 return Some(chunk);
2412 }
2413
2414 if self.footer_height > 0 {
2415 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2416 self.footer_height = 0;
2417 return Some(Chunk {
2418 text,
2419 ..Default::default()
2420 });
2421 }
2422
2423 None
2424 }
2425}
2426
2427impl ToOffset for Point {
2428 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2429 snapshot.point_to_offset(*self)
2430 }
2431}
2432
2433impl ToOffset for PointUtf16 {
2434 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2435 snapshot.point_utf16_to_offset(*self)
2436 }
2437}
2438
2439impl ToOffset for usize {
2440 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2441 assert!(*self <= snapshot.len(), "offset is out of range");
2442 *self
2443 }
2444}
2445
2446impl ToPoint for usize {
2447 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2448 snapshot.offset_to_point(*self)
2449 }
2450}
2451
2452impl ToPoint for Point {
2453 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2454 *self
2455 }
2456}
2457
2458pub fn char_kind(c: char) -> CharKind {
2459 if c == '\n' {
2460 CharKind::Newline
2461 } else if c.is_whitespace() {
2462 CharKind::Whitespace
2463 } else if c.is_alphanumeric() || c == '_' {
2464 CharKind::Word
2465 } else {
2466 CharKind::Punctuation
2467 }
2468}
2469
2470#[cfg(test)]
2471mod tests {
2472 use super::*;
2473 use gpui::MutableAppContext;
2474 use language::{Buffer, Rope};
2475 use rand::prelude::*;
2476 use std::env;
2477 use text::{Point, RandomCharIter};
2478 use util::test::sample_text;
2479
2480 #[gpui::test]
2481 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2482 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2483 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2484
2485 let snapshot = multibuffer.read(cx).snapshot(cx);
2486 assert_eq!(snapshot.text(), buffer.read(cx).text());
2487
2488 assert_eq!(
2489 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2490 (0..buffer.read(cx).row_count())
2491 .map(Some)
2492 .collect::<Vec<_>>()
2493 );
2494
2495 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2496 let snapshot = multibuffer.read(cx).snapshot(cx);
2497
2498 assert_eq!(snapshot.text(), buffer.read(cx).text());
2499 assert_eq!(
2500 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2501 (0..buffer.read(cx).row_count())
2502 .map(Some)
2503 .collect::<Vec<_>>()
2504 );
2505 }
2506
2507 #[gpui::test]
2508 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2509 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2510 let guest_buffer = cx.add_model(|cx| {
2511 let message = host_buffer.read(cx).to_proto();
2512 Buffer::from_proto(1, message, None, cx).unwrap()
2513 });
2514 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2515 let snapshot = multibuffer.read(cx).snapshot(cx);
2516 assert_eq!(snapshot.text(), "a");
2517
2518 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2519 let snapshot = multibuffer.read(cx).snapshot(cx);
2520 assert_eq!(snapshot.text(), "ab");
2521
2522 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2523 let snapshot = multibuffer.read(cx).snapshot(cx);
2524 assert_eq!(snapshot.text(), "abc");
2525 }
2526
2527 #[gpui::test]
2528 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2529 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2530 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2531 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2532
2533 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2534 let subscription = multibuffer.subscribe();
2535 multibuffer.push_excerpt(
2536 ExcerptProperties {
2537 buffer: &buffer_1,
2538 range: Point::new(1, 2)..Point::new(2, 5),
2539 },
2540 cx,
2541 );
2542 assert_eq!(
2543 subscription.consume().into_inner(),
2544 [Edit {
2545 old: 0..0,
2546 new: 0..10
2547 }]
2548 );
2549
2550 multibuffer.push_excerpt(
2551 ExcerptProperties {
2552 buffer: &buffer_1,
2553 range: Point::new(3, 3)..Point::new(4, 4),
2554 },
2555 cx,
2556 );
2557 multibuffer.push_excerpt(
2558 ExcerptProperties {
2559 buffer: &buffer_2,
2560 range: Point::new(3, 1)..Point::new(3, 3),
2561 },
2562 cx,
2563 );
2564 assert_eq!(
2565 subscription.consume().into_inner(),
2566 [Edit {
2567 old: 10..10,
2568 new: 10..22
2569 }]
2570 );
2571
2572 subscription
2573 });
2574
2575 let snapshot = multibuffer.read(cx).snapshot(cx);
2576 assert_eq!(
2577 snapshot.text(),
2578 concat!(
2579 "bbbb\n", // Preserve newlines
2580 "ccccc\n", //
2581 "ddd\n", //
2582 "eeee\n", //
2583 "jj" //
2584 )
2585 );
2586 assert_eq!(
2587 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2588 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2589 );
2590 assert_eq!(
2591 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2592 [Some(3), Some(4), Some(3)]
2593 );
2594 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2595 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2596 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2597 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2598 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2599 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2600 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2601 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2602
2603 buffer_1.update(cx, |buffer, cx| {
2604 buffer.edit(
2605 [
2606 Point::new(0, 0)..Point::new(0, 0),
2607 Point::new(2, 1)..Point::new(2, 3),
2608 ],
2609 "\n",
2610 cx,
2611 );
2612 });
2613
2614 let snapshot = multibuffer.read(cx).snapshot(cx);
2615 assert_eq!(
2616 snapshot.text(),
2617 concat!(
2618 "bbbb\n", // Preserve newlines
2619 "c\n", //
2620 "cc\n", //
2621 "ddd\n", //
2622 "eeee\n", //
2623 "jj" //
2624 )
2625 );
2626
2627 assert_eq!(
2628 subscription.consume().into_inner(),
2629 [Edit {
2630 old: 6..8,
2631 new: 6..7
2632 }]
2633 );
2634
2635 let snapshot = multibuffer.read(cx).snapshot(cx);
2636 assert_eq!(
2637 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2638 Point::new(0, 4)
2639 );
2640 assert_eq!(
2641 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2642 Point::new(0, 4)
2643 );
2644 assert_eq!(
2645 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2646 Point::new(5, 1)
2647 );
2648 assert_eq!(
2649 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2650 Point::new(5, 2)
2651 );
2652 assert_eq!(
2653 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2654 Point::new(5, 2)
2655 );
2656
2657 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2658 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2659 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2660 multibuffer.snapshot(cx)
2661 });
2662
2663 assert_eq!(
2664 snapshot.text(),
2665 concat!(
2666 "bbbb\n", // Preserve newlines
2667 "c\n", //
2668 "cc\n", //
2669 "ddd\n", //
2670 "eeee", //
2671 )
2672 );
2673 }
2674
2675 #[gpui::test]
2676 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2677 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2678
2679 let snapshot = multibuffer.read(cx).snapshot(cx);
2680 assert_eq!(snapshot.text(), "");
2681 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2682 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2683 }
2684
2685 #[gpui::test]
2686 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2687 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2688 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2689 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2690 buffer.update(cx, |buffer, cx| {
2691 buffer.edit([0..0], "X", cx);
2692 buffer.edit([5..5], "Y", cx);
2693 });
2694 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2695
2696 assert_eq!(old_snapshot.text(), "abcd");
2697 assert_eq!(new_snapshot.text(), "XabcdY");
2698
2699 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2700 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2701 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2702 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2703 }
2704
2705 #[gpui::test]
2706 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2707 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2708 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2709 let multibuffer = cx.add_model(|cx| {
2710 let mut multibuffer = MultiBuffer::new(0);
2711 multibuffer.push_excerpt(
2712 ExcerptProperties {
2713 buffer: &buffer_1,
2714 range: 0..4,
2715 },
2716 cx,
2717 );
2718 multibuffer.push_excerpt(
2719 ExcerptProperties {
2720 buffer: &buffer_2,
2721 range: 0..5,
2722 },
2723 cx,
2724 );
2725 multibuffer
2726 });
2727 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2728
2729 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2730 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2731 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2732 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2733 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2734 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2735
2736 buffer_1.update(cx, |buffer, cx| {
2737 buffer.edit([0..0], "W", cx);
2738 buffer.edit([5..5], "X", cx);
2739 });
2740 buffer_2.update(cx, |buffer, cx| {
2741 buffer.edit([0..0], "Y", cx);
2742 buffer.edit([6..0], "Z", cx);
2743 });
2744 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2745
2746 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2747 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2748
2749 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2750 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2751 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2752 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2753 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2754 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2755 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2756 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2757 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2758 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2759 }
2760
2761 #[gpui::test]
2762 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
2763 cx: &mut MutableAppContext,
2764 ) {
2765 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2766 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
2767 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2768
2769 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
2770 // Add an excerpt from buffer 1 that spans this new insertion.
2771 buffer_1.update(cx, |buffer, cx| buffer.edit([4..4], "123", cx));
2772 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
2773 multibuffer.push_excerpt(
2774 ExcerptProperties {
2775 buffer: &buffer_1,
2776 range: 0..7,
2777 },
2778 cx,
2779 )
2780 });
2781
2782 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
2783 assert_eq!(snapshot_1.text(), "abcd123");
2784
2785 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
2786 let (excerpt_id_2, excerpt_id_3, _) = multibuffer.update(cx, |multibuffer, cx| {
2787 multibuffer.remove_excerpts([&excerpt_id_1], cx);
2788 (
2789 multibuffer.push_excerpt(
2790 ExcerptProperties {
2791 buffer: &buffer_2,
2792 range: 0..4,
2793 },
2794 cx,
2795 ),
2796 multibuffer.push_excerpt(
2797 ExcerptProperties {
2798 buffer: &buffer_2,
2799 range: 6..10,
2800 },
2801 cx,
2802 ),
2803 multibuffer.push_excerpt(
2804 ExcerptProperties {
2805 buffer: &buffer_2,
2806 range: 12..16,
2807 },
2808 cx,
2809 ),
2810 )
2811 });
2812 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
2813 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
2814
2815 // The old excerpt id has been reused.
2816 assert_eq!(excerpt_id_2, excerpt_id_1);
2817
2818 // Resolve some anchors from the previous snapshot in the new snapshot.
2819 // Although there is still an excerpt with the same id, it is for
2820 // a different buffer, so we don't attempt to resolve the old text
2821 // anchor in the new buffer.
2822 assert_eq!(
2823 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
2824 0
2825 );
2826 assert_eq!(
2827 snapshot_2.summaries_for_anchors::<usize, _>(&[
2828 snapshot_1.anchor_before(2),
2829 snapshot_1.anchor_after(3)
2830 ]),
2831 vec![0, 0]
2832 );
2833 let refresh =
2834 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
2835 assert_eq!(
2836 refresh,
2837 &[
2838 (0, snapshot_2.anchor_before(0), false),
2839 (1, snapshot_2.anchor_after(0), false),
2840 ]
2841 );
2842
2843 // Replace the middle excerpt with a smaller excerpt in buffer 2,
2844 // that intersects the old excerpt.
2845 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
2846 multibuffer.remove_excerpts([&excerpt_id_3], cx);
2847 multibuffer.insert_excerpt_after(
2848 &excerpt_id_3,
2849 ExcerptProperties {
2850 buffer: &buffer_2,
2851 range: 5..8,
2852 },
2853 cx,
2854 )
2855 });
2856
2857 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
2858 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
2859 assert_ne!(excerpt_id_5, excerpt_id_3);
2860
2861 // Resolve some anchors from the previous snapshot in the new snapshot.
2862 // The anchor in the middle excerpt snaps to the beginning of the
2863 // excerpt, since it is not
2864 let anchors = [
2865 snapshot_2.anchor_before(0),
2866 snapshot_2.anchor_after(2),
2867 snapshot_2.anchor_after(6),
2868 snapshot_2.anchor_after(14),
2869 ];
2870 assert_eq!(
2871 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
2872 &[0, 2, 9, 13]
2873 );
2874
2875 let new_anchors = snapshot_3.refresh_anchors(&anchors);
2876 assert_eq!(
2877 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
2878 &[(0, true), (1, true), (2, true), (3, true)]
2879 );
2880 assert_eq!(
2881 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
2882 &[0, 2, 7, 13]
2883 );
2884 }
2885
2886 #[gpui::test(iterations = 100)]
2887 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
2888 let operations = env::var("OPERATIONS")
2889 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2890 .unwrap_or(10);
2891
2892 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2893 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2894 let mut excerpt_ids = Vec::new();
2895 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2896 let mut anchors = Vec::new();
2897 let mut old_versions = Vec::new();
2898
2899 for _ in 0..operations {
2900 match rng.gen_range(0..100) {
2901 0..=19 if !buffers.is_empty() => {
2902 let buffer = buffers.choose(&mut rng).unwrap();
2903 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
2904 }
2905 20..=29 if !expected_excerpts.is_empty() => {
2906 let mut ids_to_remove = vec![];
2907 for _ in 0..rng.gen_range(1..=3) {
2908 if expected_excerpts.is_empty() {
2909 break;
2910 }
2911
2912 let ix = rng.gen_range(0..expected_excerpts.len());
2913 ids_to_remove.push(excerpt_ids.remove(ix));
2914 let (buffer, range) = expected_excerpts.remove(ix);
2915 let buffer = buffer.read(cx);
2916 log::info!(
2917 "Removing excerpt {}: {:?}",
2918 ix,
2919 buffer
2920 .text_for_range(range.to_offset(&buffer))
2921 .collect::<String>(),
2922 );
2923 }
2924 ids_to_remove.sort_unstable();
2925 multibuffer.update(cx, |multibuffer, cx| {
2926 multibuffer.remove_excerpts(&ids_to_remove, cx)
2927 });
2928 }
2929 30..=39 if !expected_excerpts.is_empty() => {
2930 let multibuffer = multibuffer.read(cx).read(cx);
2931 let offset =
2932 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
2933 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
2934 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
2935 anchors.push(multibuffer.anchor_at(offset, bias));
2936 anchors.sort_by(|a, b| a.cmp(&b, &multibuffer).unwrap());
2937 }
2938 40..=44 if !anchors.is_empty() => {
2939 let multibuffer = multibuffer.read(cx).read(cx);
2940
2941 anchors = multibuffer
2942 .refresh_anchors(&anchors)
2943 .into_iter()
2944 .map(|a| a.1)
2945 .collect();
2946
2947 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
2948 // overshoot its boundaries.
2949 let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
2950 for anchor in &anchors {
2951 if anchor.excerpt_id == ExcerptId::min()
2952 || anchor.excerpt_id == ExcerptId::max()
2953 {
2954 continue;
2955 }
2956
2957 cursor.seek_forward(&Some(&anchor.excerpt_id), Bias::Left, &());
2958 let excerpt = cursor.item().unwrap();
2959 assert_eq!(excerpt.id, anchor.excerpt_id);
2960 assert!(excerpt.contains(anchor));
2961 }
2962 }
2963 _ => {
2964 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
2965 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
2966 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
2967 buffers.last().unwrap()
2968 } else {
2969 buffers.choose(&mut rng).unwrap()
2970 };
2971
2972 let buffer = buffer_handle.read(cx);
2973 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
2974 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
2975 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
2976 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
2977 let prev_excerpt_id = excerpt_ids
2978 .get(prev_excerpt_ix)
2979 .cloned()
2980 .unwrap_or(ExcerptId::max());
2981 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
2982
2983 log::info!(
2984 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
2985 excerpt_ix,
2986 expected_excerpts.len(),
2987 buffer_handle.id(),
2988 buffer.text(),
2989 start_ix..end_ix,
2990 &buffer.text()[start_ix..end_ix]
2991 );
2992
2993 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
2994 multibuffer.insert_excerpt_after(
2995 &prev_excerpt_id,
2996 ExcerptProperties {
2997 buffer: &buffer_handle,
2998 range: start_ix..end_ix,
2999 },
3000 cx,
3001 )
3002 });
3003
3004 excerpt_ids.insert(excerpt_ix, excerpt_id);
3005 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
3006 }
3007 }
3008
3009 if rng.gen_bool(0.3) {
3010 multibuffer.update(cx, |multibuffer, cx| {
3011 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
3012 })
3013 }
3014
3015 let snapshot = multibuffer.read(cx).snapshot(cx);
3016
3017 let mut excerpt_starts = Vec::new();
3018 let mut expected_text = String::new();
3019 let mut expected_buffer_rows = Vec::new();
3020 for (buffer, range) in &expected_excerpts {
3021 let buffer = buffer.read(cx);
3022 let buffer_range = range.to_offset(buffer);
3023
3024 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
3025 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
3026 expected_text.push('\n');
3027
3028 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
3029 ..=buffer.offset_to_point(buffer_range.end).row;
3030 for row in buffer_row_range {
3031 expected_buffer_rows.push(Some(row));
3032 }
3033 }
3034 // Remove final trailing newline.
3035 if !expected_excerpts.is_empty() {
3036 expected_text.pop();
3037 }
3038
3039 // Always report one buffer row
3040 if expected_buffer_rows.is_empty() {
3041 expected_buffer_rows.push(Some(0));
3042 }
3043
3044 assert_eq!(snapshot.text(), expected_text);
3045 log::info!("MultiBuffer text: {:?}", expected_text);
3046
3047 assert_eq!(
3048 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3049 expected_buffer_rows,
3050 );
3051
3052 for _ in 0..5 {
3053 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
3054 assert_eq!(
3055 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
3056 &expected_buffer_rows[start_row..],
3057 "buffer_rows({})",
3058 start_row
3059 );
3060 }
3061
3062 assert_eq!(
3063 snapshot.max_buffer_row(),
3064 expected_buffer_rows
3065 .into_iter()
3066 .filter_map(|r| r)
3067 .max()
3068 .unwrap()
3069 );
3070
3071 let mut excerpt_starts = excerpt_starts.into_iter();
3072 for (buffer, range) in &expected_excerpts {
3073 let buffer_id = buffer.id();
3074 let buffer = buffer.read(cx);
3075 let buffer_range = range.to_offset(buffer);
3076 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
3077 let buffer_start_point_utf16 =
3078 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
3079
3080 let excerpt_start = excerpt_starts.next().unwrap();
3081 let mut offset = excerpt_start.bytes;
3082 let mut buffer_offset = buffer_range.start;
3083 let mut point = excerpt_start.lines;
3084 let mut buffer_point = buffer_start_point;
3085 let mut point_utf16 = excerpt_start.lines_utf16;
3086 let mut buffer_point_utf16 = buffer_start_point_utf16;
3087 for ch in buffer
3088 .snapshot()
3089 .chunks(buffer_range.clone(), None)
3090 .flat_map(|c| c.text.chars())
3091 {
3092 for _ in 0..ch.len_utf8() {
3093 let left_offset = snapshot.clip_offset(offset, Bias::Left);
3094 let right_offset = snapshot.clip_offset(offset, Bias::Right);
3095 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
3096 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
3097 assert_eq!(
3098 left_offset,
3099 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
3100 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
3101 offset,
3102 buffer_id,
3103 buffer_offset,
3104 );
3105 assert_eq!(
3106 right_offset,
3107 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
3108 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
3109 offset,
3110 buffer_id,
3111 buffer_offset,
3112 );
3113
3114 let left_point = snapshot.clip_point(point, Bias::Left);
3115 let right_point = snapshot.clip_point(point, Bias::Right);
3116 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
3117 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
3118 assert_eq!(
3119 left_point,
3120 excerpt_start.lines + (buffer_left_point - buffer_start_point),
3121 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
3122 point,
3123 buffer_id,
3124 buffer_point,
3125 );
3126 assert_eq!(
3127 right_point,
3128 excerpt_start.lines + (buffer_right_point - buffer_start_point),
3129 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
3130 point,
3131 buffer_id,
3132 buffer_point,
3133 );
3134
3135 assert_eq!(
3136 snapshot.point_to_offset(left_point),
3137 left_offset,
3138 "point_to_offset({:?})",
3139 left_point,
3140 );
3141 assert_eq!(
3142 snapshot.offset_to_point(left_offset),
3143 left_point,
3144 "offset_to_point({:?})",
3145 left_offset,
3146 );
3147
3148 offset += 1;
3149 buffer_offset += 1;
3150 if ch == '\n' {
3151 point += Point::new(1, 0);
3152 buffer_point += Point::new(1, 0);
3153 } else {
3154 point += Point::new(0, 1);
3155 buffer_point += Point::new(0, 1);
3156 }
3157 }
3158
3159 for _ in 0..ch.len_utf16() {
3160 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
3161 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
3162 let buffer_left_point_utf16 =
3163 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
3164 let buffer_right_point_utf16 =
3165 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
3166 assert_eq!(
3167 left_point_utf16,
3168 excerpt_start.lines_utf16
3169 + (buffer_left_point_utf16 - buffer_start_point_utf16),
3170 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
3171 point_utf16,
3172 buffer_id,
3173 buffer_point_utf16,
3174 );
3175 assert_eq!(
3176 right_point_utf16,
3177 excerpt_start.lines_utf16
3178 + (buffer_right_point_utf16 - buffer_start_point_utf16),
3179 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
3180 point_utf16,
3181 buffer_id,
3182 buffer_point_utf16,
3183 );
3184
3185 if ch == '\n' {
3186 point_utf16 += PointUtf16::new(1, 0);
3187 buffer_point_utf16 += PointUtf16::new(1, 0);
3188 } else {
3189 point_utf16 += PointUtf16::new(0, 1);
3190 buffer_point_utf16 += PointUtf16::new(0, 1);
3191 }
3192 }
3193 }
3194 }
3195
3196 for (row, line) in expected_text.split('\n').enumerate() {
3197 assert_eq!(
3198 snapshot.line_len(row as u32),
3199 line.len() as u32,
3200 "line_len({}).",
3201 row
3202 );
3203 }
3204
3205 let text_rope = Rope::from(expected_text.as_str());
3206 for _ in 0..10 {
3207 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3208 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3209
3210 let text_for_range = snapshot
3211 .text_for_range(start_ix..end_ix)
3212 .collect::<String>();
3213 assert_eq!(
3214 text_for_range,
3215 &expected_text[start_ix..end_ix],
3216 "incorrect text for range {:?}",
3217 start_ix..end_ix
3218 );
3219
3220 let excerpted_buffer_ranges =
3221 multibuffer.read(cx).excerpted_buffers(start_ix..end_ix, cx);
3222 let excerpted_buffers_text = excerpted_buffer_ranges
3223 .into_iter()
3224 .map(|(buffer, buffer_range)| {
3225 buffer
3226 .read(cx)
3227 .text_for_range(buffer_range)
3228 .collect::<String>()
3229 })
3230 .collect::<Vec<_>>()
3231 .join("\n");
3232 assert_eq!(excerpted_buffers_text, text_for_range);
3233
3234 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
3235 assert_eq!(
3236 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
3237 expected_summary,
3238 "incorrect summary for range {:?}",
3239 start_ix..end_ix
3240 );
3241 }
3242
3243 // Anchor resolution
3244 for (anchor, resolved_offset) in anchors
3245 .iter()
3246 .zip(snapshot.summaries_for_anchors::<usize, _>(&anchors))
3247 {
3248 assert!(resolved_offset <= snapshot.len());
3249 assert_eq!(
3250 snapshot.summary_for_anchor::<usize>(anchor),
3251 resolved_offset
3252 );
3253 }
3254
3255 for _ in 0..10 {
3256 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3257 assert_eq!(
3258 snapshot.reversed_chars_at(end_ix).collect::<String>(),
3259 expected_text[..end_ix].chars().rev().collect::<String>(),
3260 );
3261 }
3262
3263 for _ in 0..10 {
3264 let end_ix = rng.gen_range(0..=text_rope.len());
3265 let start_ix = rng.gen_range(0..=end_ix);
3266 assert_eq!(
3267 snapshot
3268 .bytes_in_range(start_ix..end_ix)
3269 .flatten()
3270 .copied()
3271 .collect::<Vec<_>>(),
3272 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
3273 "bytes_in_range({:?})",
3274 start_ix..end_ix,
3275 );
3276 }
3277 }
3278
3279 let snapshot = multibuffer.read(cx).snapshot(cx);
3280 for (old_snapshot, subscription) in old_versions {
3281 let edits = subscription.consume().into_inner();
3282
3283 log::info!(
3284 "applying subscription edits to old text: {:?}: {:?}",
3285 old_snapshot.text(),
3286 edits,
3287 );
3288
3289 let mut text = old_snapshot.text();
3290 for edit in edits {
3291 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
3292 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
3293 }
3294 assert_eq!(text.to_string(), snapshot.text());
3295 }
3296 }
3297
3298 #[gpui::test]
3299 fn test_history(cx: &mut MutableAppContext) {
3300 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
3301 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
3302 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3303 let group_interval = multibuffer.read(cx).history.group_interval;
3304 multibuffer.update(cx, |multibuffer, cx| {
3305 multibuffer.push_excerpt(
3306 ExcerptProperties {
3307 buffer: &buffer_1,
3308 range: 0..buffer_1.read(cx).len(),
3309 },
3310 cx,
3311 );
3312 multibuffer.push_excerpt(
3313 ExcerptProperties {
3314 buffer: &buffer_2,
3315 range: 0..buffer_2.read(cx).len(),
3316 },
3317 cx,
3318 );
3319 });
3320
3321 let mut now = Instant::now();
3322
3323 multibuffer.update(cx, |multibuffer, cx| {
3324 multibuffer.start_transaction_at(now, cx);
3325 multibuffer.edit(
3326 [
3327 Point::new(0, 0)..Point::new(0, 0),
3328 Point::new(1, 0)..Point::new(1, 0),
3329 ],
3330 "A",
3331 cx,
3332 );
3333 multibuffer.edit(
3334 [
3335 Point::new(0, 1)..Point::new(0, 1),
3336 Point::new(1, 1)..Point::new(1, 1),
3337 ],
3338 "B",
3339 cx,
3340 );
3341 multibuffer.end_transaction_at(now, cx);
3342 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3343
3344 now += 2 * group_interval;
3345 multibuffer.start_transaction_at(now, cx);
3346 multibuffer.edit([2..2], "C", cx);
3347 multibuffer.end_transaction_at(now, cx);
3348 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3349
3350 multibuffer.undo(cx);
3351 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3352
3353 multibuffer.undo(cx);
3354 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3355
3356 multibuffer.redo(cx);
3357 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3358
3359 multibuffer.redo(cx);
3360 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3361
3362 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
3363 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3364
3365 multibuffer.undo(cx);
3366 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3367
3368 multibuffer.redo(cx);
3369 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3370
3371 multibuffer.redo(cx);
3372 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3373
3374 multibuffer.undo(cx);
3375 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3376
3377 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
3378 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3379
3380 multibuffer.undo(cx);
3381 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
3382 });
3383 }
3384}