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