1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt};
4use anyhow::Result;
5use clock::ReplicaId;
6use collections::{BTreeMap, Bound, HashMap, HashSet};
7use git::diff::DiffHunk;
8use gpui::{AppContext, Entity, ModelContext, ModelHandle, Task};
9pub use language::Completion;
10use language::{
11 char_kind, AutoindentMode, Buffer, BufferChunks, BufferSnapshot, CharKind, Chunk, CursorShape,
12 DiagnosticEntry, Event, File, IndentSize, Language, OffsetRangeExt, OffsetUtf16, Outline,
13 OutlineItem, Point, PointUtf16, Selection, TextDimension, ToOffset as _, ToOffsetUtf16 as _,
14 ToPoint as _, ToPointUtf16 as _, TransactionId, Unclipped,
15};
16use smallvec::SmallVec;
17use std::{
18 borrow::Cow,
19 cell::{Ref, RefCell},
20 cmp, fmt, io,
21 iter::{self, FromIterator},
22 mem,
23 ops::{Range, RangeBounds, Sub},
24 str,
25 sync::Arc,
26 time::{Duration, Instant},
27};
28use sum_tree::{Bias, Cursor, SumTree};
29use text::{
30 locator::Locator,
31 subscription::{Subscription, Topic},
32 Edit, TextSummary,
33};
34use theme::SyntaxTheme;
35use util::post_inc;
36
37const NEWLINES: &[u8] = &[b'\n'; u8::MAX as usize];
38
39#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
40pub struct ExcerptId(usize);
41
42pub struct MultiBuffer {
43 snapshot: RefCell<MultiBufferSnapshot>,
44 buffers: RefCell<HashMap<usize, BufferState>>,
45 next_excerpt_id: usize,
46 subscriptions: Topic,
47 singleton: bool,
48 replica_id: ReplicaId,
49 history: History,
50 title: Option<String>,
51}
52
53#[derive(Clone)]
54struct History {
55 next_transaction_id: TransactionId,
56 undo_stack: Vec<Transaction>,
57 redo_stack: Vec<Transaction>,
58 transaction_depth: usize,
59 group_interval: Duration,
60}
61
62#[derive(Clone)]
63struct Transaction {
64 id: TransactionId,
65 buffer_transactions: HashMap<usize, text::TransactionId>,
66 first_edit_at: Instant,
67 last_edit_at: Instant,
68 suppress_grouping: bool,
69}
70
71pub trait ToOffset: 'static + fmt::Debug {
72 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
73}
74
75pub trait ToOffsetUtf16: 'static + fmt::Debug {
76 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16;
77}
78
79pub trait ToPoint: 'static + fmt::Debug {
80 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
81}
82
83pub trait ToPointUtf16: 'static + fmt::Debug {
84 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
85}
86
87struct BufferState {
88 buffer: ModelHandle<Buffer>,
89 last_version: clock::Global,
90 last_parse_count: usize,
91 last_selections_update_count: usize,
92 last_diagnostics_update_count: usize,
93 last_file_update_count: usize,
94 last_git_diff_update_count: usize,
95 excerpts: Vec<Locator>,
96 _subscriptions: [gpui::Subscription; 2],
97}
98
99#[derive(Clone, Default)]
100pub struct MultiBufferSnapshot {
101 singleton: bool,
102 excerpts: SumTree<Excerpt>,
103 excerpt_ids: SumTree<ExcerptIdMapping>,
104 parse_count: usize,
105 diagnostics_update_count: usize,
106 trailing_excerpt_update_count: usize,
107 git_diff_update_count: usize,
108 edit_count: usize,
109 is_dirty: bool,
110 has_conflict: bool,
111}
112
113pub struct ExcerptBoundary {
114 pub id: ExcerptId,
115 pub row: u32,
116 pub buffer: BufferSnapshot,
117 pub range: ExcerptRange<text::Anchor>,
118 pub starts_new_buffer: bool,
119}
120
121#[derive(Clone)]
122struct Excerpt {
123 id: ExcerptId,
124 locator: Locator,
125 buffer_id: usize,
126 buffer: BufferSnapshot,
127 range: ExcerptRange<text::Anchor>,
128 max_buffer_row: u32,
129 text_summary: TextSummary,
130 has_trailing_newline: bool,
131}
132
133#[derive(Clone, Debug)]
134struct ExcerptIdMapping {
135 id: ExcerptId,
136 locator: Locator,
137}
138
139#[derive(Clone, Debug, Eq, PartialEq)]
140pub struct ExcerptRange<T> {
141 pub context: Range<T>,
142 pub primary: Option<Range<T>>,
143}
144
145#[derive(Clone, Debug, Default)]
146struct ExcerptSummary {
147 excerpt_id: ExcerptId,
148 excerpt_locator: Locator,
149 max_buffer_row: u32,
150 text: TextSummary,
151}
152
153#[derive(Clone)]
154pub struct MultiBufferRows<'a> {
155 buffer_row_range: Range<u32>,
156 excerpts: Cursor<'a, Excerpt, Point>,
157}
158
159pub struct MultiBufferChunks<'a> {
160 range: Range<usize>,
161 excerpts: Cursor<'a, Excerpt, usize>,
162 excerpt_chunks: Option<ExcerptChunks<'a>>,
163 language_aware: bool,
164}
165
166pub struct MultiBufferBytes<'a> {
167 range: Range<usize>,
168 excerpts: Cursor<'a, Excerpt, usize>,
169 excerpt_bytes: Option<ExcerptBytes<'a>>,
170 chunk: &'a [u8],
171}
172
173struct ExcerptChunks<'a> {
174 content_chunks: BufferChunks<'a>,
175 footer_height: usize,
176}
177
178struct ExcerptBytes<'a> {
179 content_bytes: text::Bytes<'a>,
180 footer_height: usize,
181}
182
183impl MultiBuffer {
184 pub fn new(replica_id: ReplicaId) -> Self {
185 Self {
186 snapshot: Default::default(),
187 buffers: Default::default(),
188 next_excerpt_id: 1,
189 subscriptions: Default::default(),
190 singleton: false,
191 replica_id,
192 history: History {
193 next_transaction_id: Default::default(),
194 undo_stack: Default::default(),
195 redo_stack: Default::default(),
196 transaction_depth: 0,
197 group_interval: Duration::from_millis(300),
198 },
199 title: Default::default(),
200 }
201 }
202
203 pub fn clone(&self, new_cx: &mut ModelContext<Self>) -> Self {
204 let mut buffers = HashMap::default();
205 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
206 buffers.insert(
207 *buffer_id,
208 BufferState {
209 buffer: buffer_state.buffer.clone(),
210 last_version: buffer_state.last_version.clone(),
211 last_parse_count: buffer_state.last_parse_count,
212 last_selections_update_count: buffer_state.last_selections_update_count,
213 last_diagnostics_update_count: buffer_state.last_diagnostics_update_count,
214 last_file_update_count: buffer_state.last_file_update_count,
215 last_git_diff_update_count: buffer_state.last_git_diff_update_count,
216 excerpts: buffer_state.excerpts.clone(),
217 _subscriptions: [
218 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
219 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
220 ],
221 },
222 );
223 }
224 Self {
225 snapshot: RefCell::new(self.snapshot.borrow().clone()),
226 buffers: RefCell::new(buffers),
227 next_excerpt_id: 1,
228 subscriptions: Default::default(),
229 singleton: self.singleton,
230 replica_id: self.replica_id,
231 history: self.history.clone(),
232 title: self.title.clone(),
233 }
234 }
235
236 pub fn with_title(mut self, title: String) -> Self {
237 self.title = Some(title);
238 self
239 }
240
241 pub fn singleton(buffer: ModelHandle<Buffer>, cx: &mut ModelContext<Self>) -> Self {
242 let mut this = Self::new(buffer.read(cx).replica_id());
243 this.singleton = true;
244 this.push_excerpts(
245 buffer,
246 [ExcerptRange {
247 context: text::Anchor::MIN..text::Anchor::MAX,
248 primary: None,
249 }],
250 cx,
251 );
252 this.snapshot.borrow_mut().singleton = true;
253 this
254 }
255
256 pub fn replica_id(&self) -> ReplicaId {
257 self.replica_id
258 }
259
260 pub fn snapshot(&self, cx: &AppContext) -> MultiBufferSnapshot {
261 self.sync(cx);
262 self.snapshot.borrow().clone()
263 }
264
265 pub(crate) fn read(&self, cx: &AppContext) -> Ref<MultiBufferSnapshot> {
266 self.sync(cx);
267 self.snapshot.borrow()
268 }
269
270 pub fn as_singleton(&self) -> Option<ModelHandle<Buffer>> {
271 if self.singleton {
272 return Some(
273 self.buffers
274 .borrow()
275 .values()
276 .next()
277 .unwrap()
278 .buffer
279 .clone(),
280 );
281 } else {
282 None
283 }
284 }
285
286 pub fn is_singleton(&self) -> bool {
287 self.singleton
288 }
289
290 pub fn subscribe(&mut self) -> Subscription {
291 self.subscriptions.subscribe()
292 }
293
294 pub fn is_dirty(&self, cx: &AppContext) -> bool {
295 self.read(cx).is_dirty()
296 }
297
298 pub fn has_conflict(&self, cx: &AppContext) -> bool {
299 self.read(cx).has_conflict()
300 }
301
302 // The `is_empty` signature doesn't match what clippy expects
303 #[allow(clippy::len_without_is_empty)]
304 pub fn len(&self, cx: &AppContext) -> usize {
305 self.read(cx).len()
306 }
307
308 pub fn is_empty(&self, cx: &AppContext) -> bool {
309 self.len(cx) != 0
310 }
311
312 pub fn symbols_containing<T: ToOffset>(
313 &self,
314 offset: T,
315 theme: Option<&SyntaxTheme>,
316 cx: &AppContext,
317 ) -> Option<(usize, Vec<OutlineItem<Anchor>>)> {
318 self.read(cx).symbols_containing(offset, theme)
319 }
320
321 pub fn git_diff_recalc(&mut self, cx: &mut ModelContext<Self>) {
322 let buffers = self.buffers.borrow();
323 for buffer_state in buffers.values() {
324 if buffer_state.buffer.read(cx).needs_git_diff_recalc() {
325 buffer_state
326 .buffer
327 .update(cx, |buffer, cx| buffer.git_diff_recalc(cx))
328 }
329 }
330 }
331
332 pub fn edit<I, S, T>(
333 &mut self,
334 edits: I,
335 mut autoindent_mode: Option<AutoindentMode>,
336 cx: &mut ModelContext<Self>,
337 ) where
338 I: IntoIterator<Item = (Range<S>, T)>,
339 S: ToOffset,
340 T: Into<Arc<str>>,
341 {
342 if self.buffers.borrow().is_empty() {
343 return;
344 }
345
346 let snapshot = self.read(cx);
347 let edits = edits.into_iter().map(|(range, new_text)| {
348 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
349 if range.start > range.end {
350 mem::swap(&mut range.start, &mut range.end);
351 }
352 (range, new_text)
353 });
354
355 if let Some(buffer) = self.as_singleton() {
356 return buffer.update(cx, |buffer, cx| {
357 buffer.edit(edits, autoindent_mode, cx);
358 });
359 }
360
361 let original_indent_columns = match &mut autoindent_mode {
362 Some(AutoindentMode::Block {
363 original_indent_columns,
364 }) => mem::take(original_indent_columns),
365 _ => Default::default(),
366 };
367
368 #[allow(clippy::type_complexity)]
369 let mut buffer_edits: HashMap<usize, Vec<(Range<usize>, Arc<str>, bool, u32)>> =
370 Default::default();
371 let mut cursor = snapshot.excerpts.cursor::<usize>();
372 for (ix, (range, new_text)) in edits.enumerate() {
373 let new_text: Arc<str> = new_text.into();
374 let original_indent_column = original_indent_columns.get(ix).copied().unwrap_or(0);
375 cursor.seek(&range.start, Bias::Right, &());
376 if cursor.item().is_none() && range.start == *cursor.start() {
377 cursor.prev(&());
378 }
379 let start_excerpt = cursor.item().expect("start offset out of bounds");
380 let start_overshoot = range.start - cursor.start();
381 let buffer_start = start_excerpt
382 .range
383 .context
384 .start
385 .to_offset(&start_excerpt.buffer)
386 + start_overshoot;
387
388 cursor.seek(&range.end, Bias::Right, &());
389 if cursor.item().is_none() && range.end == *cursor.start() {
390 cursor.prev(&());
391 }
392 let end_excerpt = cursor.item().expect("end offset out of bounds");
393 let end_overshoot = range.end - cursor.start();
394 let buffer_end = end_excerpt
395 .range
396 .context
397 .start
398 .to_offset(&end_excerpt.buffer)
399 + end_overshoot;
400
401 if start_excerpt.id == end_excerpt.id {
402 buffer_edits
403 .entry(start_excerpt.buffer_id)
404 .or_insert(Vec::new())
405 .push((
406 buffer_start..buffer_end,
407 new_text,
408 true,
409 original_indent_column,
410 ));
411 } else {
412 let start_excerpt_range = buffer_start
413 ..start_excerpt
414 .range
415 .context
416 .end
417 .to_offset(&start_excerpt.buffer);
418 let end_excerpt_range = end_excerpt
419 .range
420 .context
421 .start
422 .to_offset(&end_excerpt.buffer)
423 ..buffer_end;
424 buffer_edits
425 .entry(start_excerpt.buffer_id)
426 .or_insert(Vec::new())
427 .push((
428 start_excerpt_range,
429 new_text.clone(),
430 true,
431 original_indent_column,
432 ));
433 buffer_edits
434 .entry(end_excerpt.buffer_id)
435 .or_insert(Vec::new())
436 .push((
437 end_excerpt_range,
438 new_text.clone(),
439 false,
440 original_indent_column,
441 ));
442
443 cursor.seek(&range.start, Bias::Right, &());
444 cursor.next(&());
445 while let Some(excerpt) = cursor.item() {
446 if excerpt.id == end_excerpt.id {
447 break;
448 }
449 buffer_edits
450 .entry(excerpt.buffer_id)
451 .or_insert(Vec::new())
452 .push((
453 excerpt.range.context.to_offset(&excerpt.buffer),
454 new_text.clone(),
455 false,
456 original_indent_column,
457 ));
458 cursor.next(&());
459 }
460 }
461 }
462
463 for (buffer_id, mut edits) in buffer_edits {
464 edits.sort_unstable_by_key(|(range, _, _, _)| range.start);
465 self.buffers.borrow()[&buffer_id]
466 .buffer
467 .update(cx, |buffer, cx| {
468 let mut edits = edits.into_iter().peekable();
469 let mut insertions = Vec::new();
470 let mut original_indent_columns = Vec::new();
471 let mut deletions = Vec::new();
472 let empty_str: Arc<str> = "".into();
473 while let Some((
474 mut range,
475 new_text,
476 mut is_insertion,
477 original_indent_column,
478 )) = edits.next()
479 {
480 while let Some((next_range, _, next_is_insertion, _)) = edits.peek() {
481 if range.end >= next_range.start {
482 range.end = cmp::max(next_range.end, range.end);
483 is_insertion |= *next_is_insertion;
484 edits.next();
485 } else {
486 break;
487 }
488 }
489
490 if is_insertion {
491 original_indent_columns.push(original_indent_column);
492 insertions.push((
493 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
494 new_text.clone(),
495 ));
496 } else if !range.is_empty() {
497 deletions.push((
498 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
499 empty_str.clone(),
500 ));
501 }
502 }
503
504 let deletion_autoindent_mode =
505 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
506 Some(AutoindentMode::Block {
507 original_indent_columns: Default::default(),
508 })
509 } else {
510 None
511 };
512 let insertion_autoindent_mode =
513 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
514 Some(AutoindentMode::Block {
515 original_indent_columns,
516 })
517 } else {
518 None
519 };
520
521 buffer.edit(deletions, deletion_autoindent_mode, cx);
522 buffer.edit(insertions, insertion_autoindent_mode, cx);
523 })
524 }
525 }
526
527 pub fn start_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
528 self.start_transaction_at(Instant::now(), cx)
529 }
530
531 pub(crate) fn start_transaction_at(
532 &mut self,
533 now: Instant,
534 cx: &mut ModelContext<Self>,
535 ) -> Option<TransactionId> {
536 if let Some(buffer) = self.as_singleton() {
537 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
538 }
539
540 for BufferState { buffer, .. } in self.buffers.borrow().values() {
541 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
542 }
543 self.history.start_transaction(now)
544 }
545
546 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
547 self.end_transaction_at(Instant::now(), cx)
548 }
549
550 pub(crate) fn end_transaction_at(
551 &mut self,
552 now: Instant,
553 cx: &mut ModelContext<Self>,
554 ) -> Option<TransactionId> {
555 if let Some(buffer) = self.as_singleton() {
556 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
557 }
558
559 let mut buffer_transactions = HashMap::default();
560 for BufferState { buffer, .. } in self.buffers.borrow().values() {
561 if let Some(transaction_id) =
562 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
563 {
564 buffer_transactions.insert(buffer.id(), transaction_id);
565 }
566 }
567
568 if self.history.end_transaction(now, buffer_transactions) {
569 let transaction_id = self.history.group().unwrap();
570 Some(transaction_id)
571 } else {
572 None
573 }
574 }
575
576 pub fn finalize_last_transaction(&mut self, cx: &mut ModelContext<Self>) {
577 self.history.finalize_last_transaction();
578 for BufferState { buffer, .. } in self.buffers.borrow().values() {
579 buffer.update(cx, |buffer, _| {
580 buffer.finalize_last_transaction();
581 });
582 }
583 }
584
585 pub fn push_transaction<'a, T>(&mut self, buffer_transactions: T)
586 where
587 T: IntoIterator<Item = (&'a ModelHandle<Buffer>, &'a language::Transaction)>,
588 {
589 self.history
590 .push_transaction(buffer_transactions, Instant::now());
591 self.history.finalize_last_transaction();
592 }
593
594 pub fn group_until_transaction(
595 &mut self,
596 transaction_id: TransactionId,
597 cx: &mut ModelContext<Self>,
598 ) {
599 if let Some(buffer) = self.as_singleton() {
600 buffer.update(cx, |buffer, _| {
601 buffer.group_until_transaction(transaction_id)
602 });
603 } else {
604 self.history.group_until(transaction_id);
605 }
606 }
607
608 pub fn set_active_selections(
609 &mut self,
610 selections: &[Selection<Anchor>],
611 line_mode: bool,
612 cursor_shape: CursorShape,
613 cx: &mut ModelContext<Self>,
614 ) {
615 let mut selections_by_buffer: HashMap<usize, Vec<Selection<text::Anchor>>> =
616 Default::default();
617 let snapshot = self.read(cx);
618 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
619 for selection in selections {
620 let start_locator = snapshot.excerpt_locator_for_id(selection.start.excerpt_id);
621 let end_locator = snapshot.excerpt_locator_for_id(selection.end.excerpt_id);
622
623 cursor.seek(&Some(start_locator), Bias::Left, &());
624 while let Some(excerpt) = cursor.item() {
625 if excerpt.locator > *end_locator {
626 break;
627 }
628
629 let mut start = excerpt.range.context.start;
630 let mut end = excerpt.range.context.end;
631 if excerpt.id == selection.start.excerpt_id {
632 start = selection.start.text_anchor;
633 }
634 if excerpt.id == selection.end.excerpt_id {
635 end = selection.end.text_anchor;
636 }
637 selections_by_buffer
638 .entry(excerpt.buffer_id)
639 .or_default()
640 .push(Selection {
641 id: selection.id,
642 start,
643 end,
644 reversed: selection.reversed,
645 goal: selection.goal,
646 });
647
648 cursor.next(&());
649 }
650 }
651
652 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
653 if !selections_by_buffer.contains_key(buffer_id) {
654 buffer_state
655 .buffer
656 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
657 }
658 }
659
660 for (buffer_id, mut selections) in selections_by_buffer {
661 self.buffers.borrow()[&buffer_id]
662 .buffer
663 .update(cx, |buffer, cx| {
664 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer));
665 let mut selections = selections.into_iter().peekable();
666 let merged_selections = Arc::from_iter(iter::from_fn(|| {
667 let mut selection = selections.next()?;
668 while let Some(next_selection) = selections.peek() {
669 if selection.end.cmp(&next_selection.start, buffer).is_ge() {
670 let next_selection = selections.next().unwrap();
671 if next_selection.end.cmp(&selection.end, buffer).is_ge() {
672 selection.end = next_selection.end;
673 }
674 } else {
675 break;
676 }
677 }
678 Some(selection)
679 }));
680 buffer.set_active_selections(merged_selections, line_mode, cursor_shape, cx);
681 });
682 }
683 }
684
685 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
686 for buffer in self.buffers.borrow().values() {
687 buffer
688 .buffer
689 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
690 }
691 }
692
693 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
694 if let Some(buffer) = self.as_singleton() {
695 return buffer.update(cx, |buffer, cx| buffer.undo(cx));
696 }
697
698 while let Some(transaction) = self.history.pop_undo() {
699 let mut undone = false;
700 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
701 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
702 undone |= buffer.update(cx, |buffer, cx| {
703 let undo_to = *buffer_transaction_id;
704 if let Some(entry) = buffer.peek_undo_stack() {
705 *buffer_transaction_id = entry.transaction_id();
706 }
707 buffer.undo_to_transaction(undo_to, cx)
708 });
709 }
710 }
711
712 if undone {
713 return Some(transaction.id);
714 }
715 }
716
717 None
718 }
719
720 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
721 if let Some(buffer) = self.as_singleton() {
722 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
723 }
724
725 while let Some(transaction) = self.history.pop_redo() {
726 let mut redone = false;
727 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
728 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
729 redone |= buffer.update(cx, |buffer, cx| {
730 let redo_to = *buffer_transaction_id;
731 if let Some(entry) = buffer.peek_redo_stack() {
732 *buffer_transaction_id = entry.transaction_id();
733 }
734 buffer.redo_to_transaction(redo_to, cx)
735 });
736 }
737 }
738
739 if redone {
740 return Some(transaction.id);
741 }
742 }
743
744 None
745 }
746
747 pub fn push_excerpts<O>(
748 &mut self,
749 buffer: ModelHandle<Buffer>,
750 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
751 cx: &mut ModelContext<Self>,
752 ) -> Vec<ExcerptId>
753 where
754 O: text::ToOffset,
755 {
756 self.insert_excerpts_after(ExcerptId::max(), buffer, ranges, cx)
757 }
758
759 pub fn push_excerpts_with_context_lines<O>(
760 &mut self,
761 buffer: ModelHandle<Buffer>,
762 ranges: Vec<Range<O>>,
763 context_line_count: u32,
764 cx: &mut ModelContext<Self>,
765 ) -> Vec<Range<Anchor>>
766 where
767 O: text::ToPoint + text::ToOffset,
768 {
769 let buffer_id = buffer.id();
770 let buffer_snapshot = buffer.read(cx).snapshot();
771 let max_point = buffer_snapshot.max_point();
772
773 let mut range_counts = Vec::new();
774 let mut excerpt_ranges = Vec::new();
775 let mut range_iter = ranges
776 .iter()
777 .map(|range| {
778 range.start.to_point(&buffer_snapshot)..range.end.to_point(&buffer_snapshot)
779 })
780 .peekable();
781 while let Some(range) = range_iter.next() {
782 let excerpt_start = Point::new(range.start.row.saturating_sub(context_line_count), 0);
783 let mut excerpt_end =
784 Point::new(range.end.row + 1 + context_line_count, 0).min(max_point);
785 let mut ranges_in_excerpt = 1;
786
787 while let Some(next_range) = range_iter.peek() {
788 if next_range.start.row <= excerpt_end.row + context_line_count {
789 excerpt_end =
790 Point::new(next_range.end.row + 1 + context_line_count, 0).min(max_point);
791 ranges_in_excerpt += 1;
792 range_iter.next();
793 } else {
794 break;
795 }
796 }
797
798 excerpt_ranges.push(ExcerptRange {
799 context: excerpt_start..excerpt_end,
800 primary: Some(range),
801 });
802 range_counts.push(ranges_in_excerpt);
803 }
804
805 let excerpt_ids = self.push_excerpts(buffer, excerpt_ranges, cx);
806
807 let mut anchor_ranges = Vec::new();
808 let mut ranges = ranges.into_iter();
809 for (excerpt_id, range_count) in excerpt_ids.into_iter().zip(range_counts.into_iter()) {
810 anchor_ranges.extend(ranges.by_ref().take(range_count).map(|range| {
811 let start = Anchor {
812 buffer_id: Some(buffer_id),
813 excerpt_id: excerpt_id.clone(),
814 text_anchor: buffer_snapshot.anchor_after(range.start),
815 };
816 let end = Anchor {
817 buffer_id: Some(buffer_id),
818 excerpt_id: excerpt_id.clone(),
819 text_anchor: buffer_snapshot.anchor_after(range.end),
820 };
821 start..end
822 }))
823 }
824 anchor_ranges
825 }
826
827 pub fn insert_excerpts_after<O>(
828 &mut self,
829 prev_excerpt_id: ExcerptId,
830 buffer: ModelHandle<Buffer>,
831 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
832 cx: &mut ModelContext<Self>,
833 ) -> Vec<ExcerptId>
834 where
835 O: text::ToOffset,
836 {
837 assert_eq!(self.history.transaction_depth, 0);
838 let mut ranges = ranges.into_iter().peekable();
839 if ranges.peek().is_none() {
840 return Default::default();
841 }
842
843 self.sync(cx);
844
845 let buffer_id = buffer.id();
846 let buffer_snapshot = buffer.read(cx).snapshot();
847
848 let mut buffers = self.buffers.borrow_mut();
849 let buffer_state = buffers.entry(buffer_id).or_insert_with(|| BufferState {
850 last_version: buffer_snapshot.version().clone(),
851 last_parse_count: buffer_snapshot.parse_count(),
852 last_selections_update_count: buffer_snapshot.selections_update_count(),
853 last_diagnostics_update_count: buffer_snapshot.diagnostics_update_count(),
854 last_file_update_count: buffer_snapshot.file_update_count(),
855 last_git_diff_update_count: buffer_snapshot.git_diff_update_count(),
856 excerpts: Default::default(),
857 _subscriptions: [
858 cx.observe(&buffer, |_, _, cx| cx.notify()),
859 cx.subscribe(&buffer, Self::on_buffer_event),
860 ],
861 buffer,
862 });
863
864 let mut snapshot = self.snapshot.borrow_mut();
865
866 let mut prev_locator = snapshot.excerpt_locator_for_id(prev_excerpt_id).clone();
867 let mut new_excerpt_ids = mem::take(&mut snapshot.excerpt_ids);
868 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
869 let mut new_excerpts = cursor.slice(&prev_locator, Bias::Right, &());
870 prev_locator = cursor.start().unwrap_or(Locator::min_ref()).clone();
871
872 let edit_start = new_excerpts.summary().text.len;
873 new_excerpts.update_last(
874 |excerpt| {
875 excerpt.has_trailing_newline = true;
876 },
877 &(),
878 );
879
880 let next_locator = if let Some(excerpt) = cursor.item() {
881 excerpt.locator.clone()
882 } else {
883 Locator::max()
884 };
885
886 let mut ids = Vec::new();
887 while let Some(range) = ranges.next() {
888 let locator = Locator::between(&prev_locator, &next_locator);
889 if let Err(ix) = buffer_state.excerpts.binary_search(&locator) {
890 buffer_state.excerpts.insert(ix, locator.clone());
891 }
892 let range = ExcerptRange {
893 context: buffer_snapshot.anchor_before(&range.context.start)
894 ..buffer_snapshot.anchor_after(&range.context.end),
895 primary: range.primary.map(|primary| {
896 buffer_snapshot.anchor_before(&primary.start)
897 ..buffer_snapshot.anchor_after(&primary.end)
898 }),
899 };
900 let id = ExcerptId(post_inc(&mut self.next_excerpt_id));
901 let excerpt = Excerpt::new(
902 id,
903 locator.clone(),
904 buffer_id,
905 buffer_snapshot.clone(),
906 range,
907 ranges.peek().is_some() || cursor.item().is_some(),
908 );
909 new_excerpts.push(excerpt, &());
910 prev_locator = locator.clone();
911 new_excerpt_ids.push(ExcerptIdMapping { id, locator }, &());
912 ids.push(id);
913 }
914
915 let edit_end = new_excerpts.summary().text.len;
916
917 let suffix = cursor.suffix(&());
918 let changed_trailing_excerpt = suffix.is_empty();
919 new_excerpts.push_tree(suffix, &());
920 drop(cursor);
921 snapshot.excerpts = new_excerpts;
922 snapshot.excerpt_ids = new_excerpt_ids;
923 if changed_trailing_excerpt {
924 snapshot.trailing_excerpt_update_count += 1;
925 }
926
927 self.subscriptions.publish_mut([Edit {
928 old: edit_start..edit_start,
929 new: edit_start..edit_end,
930 }]);
931 cx.emit(Event::Edited);
932 cx.notify();
933 ids
934 }
935
936 pub fn clear(&mut self, cx: &mut ModelContext<Self>) {
937 self.sync(cx);
938 self.buffers.borrow_mut().clear();
939 let mut snapshot = self.snapshot.borrow_mut();
940 let prev_len = snapshot.len();
941 snapshot.excerpts = Default::default();
942 snapshot.trailing_excerpt_update_count += 1;
943 snapshot.is_dirty = false;
944 snapshot.has_conflict = false;
945
946 self.subscriptions.publish_mut([Edit {
947 old: 0..prev_len,
948 new: 0..0,
949 }]);
950 cx.emit(Event::Edited);
951 cx.notify();
952 }
953
954 pub fn excerpts_for_buffer(
955 &self,
956 buffer: &ModelHandle<Buffer>,
957 cx: &AppContext,
958 ) -> Vec<(ExcerptId, ExcerptRange<text::Anchor>)> {
959 let mut excerpts = Vec::new();
960 let snapshot = self.read(cx);
961 let buffers = self.buffers.borrow();
962 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
963 for locator in buffers
964 .get(&buffer.id())
965 .map(|state| &state.excerpts)
966 .into_iter()
967 .flatten()
968 {
969 cursor.seek_forward(&Some(locator), Bias::Left, &());
970 if let Some(excerpt) = cursor.item() {
971 if excerpt.locator == *locator {
972 excerpts.push((excerpt.id.clone(), excerpt.range.clone()));
973 }
974 }
975 }
976
977 excerpts
978 }
979
980 pub fn excerpt_ids(&self) -> Vec<ExcerptId> {
981 self.snapshot
982 .borrow()
983 .excerpts
984 .iter()
985 .map(|entry| entry.id)
986 .collect()
987 }
988
989 pub fn excerpt_containing(
990 &self,
991 position: impl ToOffset,
992 cx: &AppContext,
993 ) -> Option<(ExcerptId, ModelHandle<Buffer>, Range<text::Anchor>)> {
994 let snapshot = self.read(cx);
995 let position = position.to_offset(&snapshot);
996
997 let mut cursor = snapshot.excerpts.cursor::<usize>();
998 cursor.seek(&position, Bias::Right, &());
999 cursor.item().map(|excerpt| {
1000 (
1001 excerpt.id.clone(),
1002 self.buffers
1003 .borrow()
1004 .get(&excerpt.buffer_id)
1005 .unwrap()
1006 .buffer
1007 .clone(),
1008 excerpt.range.context.clone(),
1009 )
1010 })
1011 }
1012
1013 // If point is at the end of the buffer, the last excerpt is returned
1014 pub fn point_to_buffer_offset<T: ToOffset>(
1015 &self,
1016 point: T,
1017 cx: &AppContext,
1018 ) -> Option<(ModelHandle<Buffer>, usize)> {
1019 let snapshot = self.read(cx);
1020 let offset = point.to_offset(&snapshot);
1021 let mut cursor = snapshot.excerpts.cursor::<usize>();
1022 cursor.seek(&offset, Bias::Right, &());
1023 if cursor.item().is_none() {
1024 cursor.prev(&());
1025 }
1026
1027 cursor.item().map(|excerpt| {
1028 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1029 let buffer_point = excerpt_start + offset - *cursor.start();
1030 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
1031
1032 (buffer, buffer_point)
1033 })
1034 }
1035
1036 pub fn range_to_buffer_ranges<T: ToOffset>(
1037 &self,
1038 range: Range<T>,
1039 cx: &AppContext,
1040 ) -> Vec<(ModelHandle<Buffer>, Range<usize>)> {
1041 let snapshot = self.read(cx);
1042 let start = range.start.to_offset(&snapshot);
1043 let end = range.end.to_offset(&snapshot);
1044
1045 let mut result = Vec::new();
1046 let mut cursor = snapshot.excerpts.cursor::<usize>();
1047 cursor.seek(&start, Bias::Right, &());
1048 while let Some(excerpt) = cursor.item() {
1049 if *cursor.start() > end {
1050 break;
1051 }
1052
1053 let mut end_before_newline = cursor.end(&());
1054 if excerpt.has_trailing_newline {
1055 end_before_newline -= 1;
1056 }
1057 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1058 let start = excerpt_start + (cmp::max(start, *cursor.start()) - *cursor.start());
1059 let end = excerpt_start + (cmp::min(end, end_before_newline) - *cursor.start());
1060 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
1061 result.push((buffer, start..end));
1062 cursor.next(&());
1063 }
1064
1065 result
1066 }
1067
1068 pub fn remove_excerpts(
1069 &mut self,
1070 excerpt_ids: impl IntoIterator<Item = ExcerptId>,
1071 cx: &mut ModelContext<Self>,
1072 ) {
1073 self.sync(cx);
1074 let mut buffers = self.buffers.borrow_mut();
1075 let mut snapshot = self.snapshot.borrow_mut();
1076 let mut new_excerpts = SumTree::new();
1077 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1078 let mut edits = Vec::new();
1079 let mut excerpt_ids = excerpt_ids.into_iter().peekable();
1080
1081 while let Some(excerpt_id) = excerpt_ids.next() {
1082 // Seek to the next excerpt to remove, preserving any preceding excerpts.
1083 let locator = snapshot.excerpt_locator_for_id(excerpt_id);
1084 new_excerpts.push_tree(cursor.slice(&Some(locator), Bias::Left, &()), &());
1085
1086 if let Some(mut excerpt) = cursor.item() {
1087 if excerpt.id != excerpt_id {
1088 continue;
1089 }
1090 let mut old_start = cursor.start().1;
1091
1092 // Skip over the removed excerpt.
1093 'remove_excerpts: loop {
1094 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
1095 buffer_state.excerpts.retain(|l| l != &excerpt.locator);
1096 if buffer_state.excerpts.is_empty() {
1097 buffers.remove(&excerpt.buffer_id);
1098 }
1099 }
1100 cursor.next(&());
1101
1102 // Skip over any subsequent excerpts that are also removed.
1103 while let Some(&next_excerpt_id) = excerpt_ids.peek() {
1104 let next_locator = snapshot.excerpt_locator_for_id(next_excerpt_id);
1105 if let Some(next_excerpt) = cursor.item() {
1106 if next_excerpt.locator == *next_locator {
1107 excerpt_ids.next();
1108 excerpt = next_excerpt;
1109 continue 'remove_excerpts;
1110 }
1111 }
1112 break;
1113 }
1114
1115 break;
1116 }
1117
1118 // When removing the last excerpt, remove the trailing newline from
1119 // the previous excerpt.
1120 if cursor.item().is_none() && old_start > 0 {
1121 old_start -= 1;
1122 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
1123 }
1124
1125 // Push an edit for the removal of this run of excerpts.
1126 let old_end = cursor.start().1;
1127 let new_start = new_excerpts.summary().text.len;
1128 edits.push(Edit {
1129 old: old_start..old_end,
1130 new: new_start..new_start,
1131 });
1132 }
1133 }
1134 let suffix = cursor.suffix(&());
1135 let changed_trailing_excerpt = suffix.is_empty();
1136 new_excerpts.push_tree(suffix, &());
1137 drop(cursor);
1138 snapshot.excerpts = new_excerpts;
1139
1140 if changed_trailing_excerpt {
1141 snapshot.trailing_excerpt_update_count += 1;
1142 }
1143
1144 self.subscriptions.publish_mut(edits);
1145 cx.emit(Event::Edited);
1146 cx.notify();
1147 }
1148
1149 pub fn text_anchor_for_position<T: ToOffset>(
1150 &self,
1151 position: T,
1152 cx: &AppContext,
1153 ) -> Option<(ModelHandle<Buffer>, language::Anchor)> {
1154 let snapshot = self.read(cx);
1155 let anchor = snapshot.anchor_before(position);
1156 let buffer = self
1157 .buffers
1158 .borrow()
1159 .get(&anchor.buffer_id?)?
1160 .buffer
1161 .clone();
1162 Some((buffer, anchor.text_anchor))
1163 }
1164
1165 fn on_buffer_event(
1166 &mut self,
1167 _: ModelHandle<Buffer>,
1168 event: &Event,
1169 cx: &mut ModelContext<Self>,
1170 ) {
1171 cx.emit(event.clone());
1172 }
1173
1174 pub fn all_buffers(&self) -> HashSet<ModelHandle<Buffer>> {
1175 self.buffers
1176 .borrow()
1177 .values()
1178 .map(|state| state.buffer.clone())
1179 .collect()
1180 }
1181
1182 pub fn buffer(&self, buffer_id: usize) -> Option<ModelHandle<Buffer>> {
1183 self.buffers
1184 .borrow()
1185 .get(&buffer_id)
1186 .map(|state| state.buffer.clone())
1187 }
1188
1189 pub fn save(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
1190 let mut save_tasks = Vec::new();
1191 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1192 save_tasks.push(buffer.update(cx, |buffer, cx| buffer.save(cx)));
1193 }
1194
1195 cx.spawn(|_, _| async move {
1196 for save in save_tasks {
1197 save.await?;
1198 }
1199 Ok(())
1200 })
1201 }
1202
1203 pub fn is_completion_trigger<T>(&self, position: T, text: &str, cx: &AppContext) -> bool
1204 where
1205 T: ToOffset,
1206 {
1207 let mut chars = text.chars();
1208 let char = if let Some(char) = chars.next() {
1209 char
1210 } else {
1211 return false;
1212 };
1213 if chars.next().is_some() {
1214 return false;
1215 }
1216
1217 if char.is_alphanumeric() || char == '_' {
1218 return true;
1219 }
1220
1221 let snapshot = self.snapshot(cx);
1222 let anchor = snapshot.anchor_before(position);
1223 anchor
1224 .buffer_id
1225 .and_then(|buffer_id| {
1226 let buffer = self.buffers.borrow().get(&buffer_id)?.buffer.clone();
1227 Some(
1228 buffer
1229 .read(cx)
1230 .completion_triggers()
1231 .iter()
1232 .any(|string| string == text),
1233 )
1234 })
1235 .unwrap_or(false)
1236 }
1237
1238 pub fn language_at<'a, T: ToOffset>(
1239 &self,
1240 point: T,
1241 cx: &'a AppContext,
1242 ) -> Option<Arc<Language>> {
1243 self.point_to_buffer_offset(point, cx)
1244 .and_then(|(buffer, offset)| buffer.read(cx).language_at(offset))
1245 }
1246
1247 pub fn files<'a>(&'a self, cx: &'a AppContext) -> SmallVec<[&'a dyn File; 2]> {
1248 let buffers = self.buffers.borrow();
1249 buffers
1250 .values()
1251 .filter_map(|buffer| buffer.buffer.read(cx).file())
1252 .collect()
1253 }
1254
1255 pub fn title<'a>(&'a self, cx: &'a AppContext) -> Cow<'a, str> {
1256 if let Some(title) = self.title.as_ref() {
1257 return title.into();
1258 }
1259
1260 if let Some(buffer) = self.as_singleton() {
1261 if let Some(file) = buffer.read(cx).file() {
1262 return file.file_name(cx).to_string_lossy();
1263 }
1264 }
1265
1266 "untitled".into()
1267 }
1268
1269 #[cfg(test)]
1270 pub fn is_parsing(&self, cx: &AppContext) -> bool {
1271 self.as_singleton().unwrap().read(cx).is_parsing()
1272 }
1273
1274 fn sync(&self, cx: &AppContext) {
1275 let mut snapshot = self.snapshot.borrow_mut();
1276 let mut excerpts_to_edit = Vec::new();
1277 let mut reparsed = false;
1278 let mut diagnostics_updated = false;
1279 let mut git_diff_updated = false;
1280 let mut is_dirty = false;
1281 let mut has_conflict = false;
1282 let mut edited = false;
1283 let mut buffers = self.buffers.borrow_mut();
1284 for buffer_state in buffers.values_mut() {
1285 let buffer = buffer_state.buffer.read(cx);
1286 let version = buffer.version();
1287 let parse_count = buffer.parse_count();
1288 let selections_update_count = buffer.selections_update_count();
1289 let diagnostics_update_count = buffer.diagnostics_update_count();
1290 let file_update_count = buffer.file_update_count();
1291 let git_diff_update_count = buffer.git_diff_update_count();
1292
1293 let buffer_edited = version.changed_since(&buffer_state.last_version);
1294 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
1295 let buffer_selections_updated =
1296 selections_update_count > buffer_state.last_selections_update_count;
1297 let buffer_diagnostics_updated =
1298 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
1299 let buffer_file_updated = file_update_count > buffer_state.last_file_update_count;
1300 let buffer_git_diff_updated =
1301 git_diff_update_count > buffer_state.last_git_diff_update_count;
1302 if buffer_edited
1303 || buffer_reparsed
1304 || buffer_selections_updated
1305 || buffer_diagnostics_updated
1306 || buffer_file_updated
1307 || buffer_git_diff_updated
1308 {
1309 buffer_state.last_version = version;
1310 buffer_state.last_parse_count = parse_count;
1311 buffer_state.last_selections_update_count = selections_update_count;
1312 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
1313 buffer_state.last_file_update_count = file_update_count;
1314 buffer_state.last_git_diff_update_count = git_diff_update_count;
1315 excerpts_to_edit.extend(
1316 buffer_state
1317 .excerpts
1318 .iter()
1319 .map(|locator| (locator, buffer_state.buffer.clone(), buffer_edited)),
1320 );
1321 }
1322
1323 edited |= buffer_edited;
1324 reparsed |= buffer_reparsed;
1325 diagnostics_updated |= buffer_diagnostics_updated;
1326 git_diff_updated |= buffer_git_diff_updated;
1327 is_dirty |= buffer.is_dirty();
1328 has_conflict |= buffer.has_conflict();
1329 }
1330 if edited {
1331 snapshot.edit_count += 1;
1332 }
1333 if reparsed {
1334 snapshot.parse_count += 1;
1335 }
1336 if diagnostics_updated {
1337 snapshot.diagnostics_update_count += 1;
1338 }
1339 if git_diff_updated {
1340 snapshot.git_diff_update_count += 1;
1341 }
1342 snapshot.is_dirty = is_dirty;
1343 snapshot.has_conflict = has_conflict;
1344
1345 excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);
1346
1347 let mut edits = Vec::new();
1348 let mut new_excerpts = SumTree::new();
1349 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1350
1351 for (locator, buffer, buffer_edited) in excerpts_to_edit {
1352 new_excerpts.push_tree(cursor.slice(&Some(locator), Bias::Left, &()), &());
1353 let old_excerpt = cursor.item().unwrap();
1354 let buffer_id = buffer.id();
1355 let buffer = buffer.read(cx);
1356
1357 let mut new_excerpt;
1358 if buffer_edited {
1359 edits.extend(
1360 buffer
1361 .edits_since_in_range::<usize>(
1362 old_excerpt.buffer.version(),
1363 old_excerpt.range.context.clone(),
1364 )
1365 .map(|mut edit| {
1366 let excerpt_old_start = cursor.start().1;
1367 let excerpt_new_start = new_excerpts.summary().text.len;
1368 edit.old.start += excerpt_old_start;
1369 edit.old.end += excerpt_old_start;
1370 edit.new.start += excerpt_new_start;
1371 edit.new.end += excerpt_new_start;
1372 edit
1373 }),
1374 );
1375
1376 new_excerpt = Excerpt::new(
1377 old_excerpt.id,
1378 locator.clone(),
1379 buffer_id,
1380 buffer.snapshot(),
1381 old_excerpt.range.clone(),
1382 old_excerpt.has_trailing_newline,
1383 );
1384 } else {
1385 new_excerpt = old_excerpt.clone();
1386 new_excerpt.buffer = buffer.snapshot();
1387 }
1388
1389 new_excerpts.push(new_excerpt, &());
1390 cursor.next(&());
1391 }
1392 new_excerpts.push_tree(cursor.suffix(&()), &());
1393
1394 drop(cursor);
1395 snapshot.excerpts = new_excerpts;
1396
1397 self.subscriptions.publish(edits);
1398 }
1399}
1400
1401#[cfg(any(test, feature = "test-support"))]
1402impl MultiBuffer {
1403 pub fn build_simple(text: &str, cx: &mut gpui::MutableAppContext) -> ModelHandle<Self> {
1404 let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
1405 cx.add_model(|cx| Self::singleton(buffer, cx))
1406 }
1407
1408 pub fn build_random(
1409 rng: &mut impl rand::Rng,
1410 cx: &mut gpui::MutableAppContext,
1411 ) -> ModelHandle<Self> {
1412 cx.add_model(|cx| {
1413 let mut multibuffer = MultiBuffer::new(0);
1414 let mutation_count = rng.gen_range(1..=5);
1415 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
1416 multibuffer
1417 })
1418 }
1419
1420 pub fn randomly_edit(
1421 &mut self,
1422 rng: &mut impl rand::Rng,
1423 edit_count: usize,
1424 cx: &mut ModelContext<Self>,
1425 ) {
1426 use util::RandomCharIter;
1427
1428 let snapshot = self.read(cx);
1429 let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
1430 let mut last_end = None;
1431 for _ in 0..edit_count {
1432 if last_end.map_or(false, |last_end| last_end >= snapshot.len()) {
1433 break;
1434 }
1435
1436 let new_start = last_end.map_or(0, |last_end| last_end + 1);
1437 let end = snapshot.clip_offset(rng.gen_range(new_start..=snapshot.len()), Bias::Right);
1438 let start = snapshot.clip_offset(rng.gen_range(new_start..=end), Bias::Right);
1439 last_end = Some(end);
1440
1441 let mut range = start..end;
1442 if rng.gen_bool(0.2) {
1443 mem::swap(&mut range.start, &mut range.end);
1444 }
1445
1446 let new_text_len = rng.gen_range(0..10);
1447 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1448
1449 edits.push((range, new_text.into()));
1450 }
1451 log::info!("mutating multi-buffer with {:?}", edits);
1452 drop(snapshot);
1453
1454 self.edit(edits, None, cx);
1455 }
1456
1457 pub fn randomly_edit_excerpts(
1458 &mut self,
1459 rng: &mut impl rand::Rng,
1460 mutation_count: usize,
1461 cx: &mut ModelContext<Self>,
1462 ) {
1463 use rand::prelude::*;
1464 use std::env;
1465 use util::RandomCharIter;
1466
1467 let max_excerpts = env::var("MAX_EXCERPTS")
1468 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
1469 .unwrap_or(5);
1470
1471 let mut buffers = Vec::new();
1472 for _ in 0..mutation_count {
1473 if rng.gen_bool(0.05) {
1474 log::info!("Clearing multi-buffer");
1475 self.clear(cx);
1476 continue;
1477 }
1478
1479 let excerpt_ids = self.excerpt_ids();
1480 if excerpt_ids.is_empty() || (rng.gen() && excerpt_ids.len() < max_excerpts) {
1481 let buffer_handle = if rng.gen() || self.buffers.borrow().is_empty() {
1482 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
1483 buffers.push(cx.add_model(|cx| Buffer::new(0, text, cx)));
1484 let buffer = buffers.last().unwrap();
1485 log::info!(
1486 "Creating new buffer {} with text: {:?}",
1487 buffer.id(),
1488 buffer.read(cx).text()
1489 );
1490 buffers.last().unwrap().clone()
1491 } else {
1492 self.buffers
1493 .borrow()
1494 .values()
1495 .choose(rng)
1496 .unwrap()
1497 .buffer
1498 .clone()
1499 };
1500
1501 let buffer = buffer_handle.read(cx);
1502 let buffer_text = buffer.text();
1503 let ranges = (0..rng.gen_range(0..5))
1504 .map(|_| {
1505 let end_ix =
1506 buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
1507 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1508 ExcerptRange {
1509 context: start_ix..end_ix,
1510 primary: None,
1511 }
1512 })
1513 .collect::<Vec<_>>();
1514 log::info!(
1515 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
1516 buffer_handle.id(),
1517 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
1518 ranges
1519 .iter()
1520 .map(|r| &buffer_text[r.context.clone()])
1521 .collect::<Vec<_>>()
1522 );
1523
1524 let excerpt_id = self.push_excerpts(buffer_handle.clone(), ranges, cx);
1525 log::info!("Inserted with ids: {:?}", excerpt_id);
1526 } else {
1527 let remove_count = rng.gen_range(1..=excerpt_ids.len());
1528 let mut excerpts_to_remove = excerpt_ids
1529 .choose_multiple(rng, remove_count)
1530 .cloned()
1531 .collect::<Vec<_>>();
1532 let snapshot = self.snapshot.borrow();
1533 excerpts_to_remove.sort_unstable_by(|a, b| a.cmp(b, &*snapshot));
1534 drop(snapshot);
1535 log::info!("Removing excerpts {:?}", excerpts_to_remove);
1536 self.remove_excerpts(excerpts_to_remove, cx);
1537 }
1538 }
1539 }
1540
1541 pub fn randomly_mutate(
1542 &mut self,
1543 rng: &mut impl rand::Rng,
1544 mutation_count: usize,
1545 cx: &mut ModelContext<Self>,
1546 ) {
1547 use rand::prelude::*;
1548
1549 if rng.gen_bool(0.7) || self.singleton {
1550 let buffer = self
1551 .buffers
1552 .borrow()
1553 .values()
1554 .choose(rng)
1555 .map(|state| state.buffer.clone());
1556
1557 if let Some(buffer) = buffer {
1558 buffer.update(cx, |buffer, cx| {
1559 if rng.gen() {
1560 buffer.randomly_edit(rng, mutation_count, cx);
1561 } else {
1562 buffer.randomly_undo_redo(rng, cx);
1563 }
1564 });
1565 } else {
1566 self.randomly_edit(rng, mutation_count, cx);
1567 }
1568 } else {
1569 self.randomly_edit_excerpts(rng, mutation_count, cx);
1570 }
1571
1572 self.check_invariants(cx);
1573 }
1574
1575 fn check_invariants(&self, cx: &mut ModelContext<Self>) {
1576 let snapshot = self.read(cx);
1577 let excerpts = snapshot.excerpts.items(&());
1578 let excerpt_ids = snapshot.excerpt_ids.items(&());
1579
1580 for (ix, excerpt) in excerpts.iter().enumerate() {
1581 if ix == 0 {
1582 if excerpt.locator <= Locator::min() {
1583 panic!("invalid first excerpt locator {:?}", excerpt.locator);
1584 }
1585 } else {
1586 if excerpt.locator <= excerpts[ix - 1].locator {
1587 panic!("excerpts are out-of-order: {:?}", excerpts);
1588 }
1589 }
1590 }
1591
1592 for (ix, entry) in excerpt_ids.iter().enumerate() {
1593 if ix == 0 {
1594 if entry.id.cmp(&ExcerptId::min(), &*snapshot).is_le() {
1595 panic!("invalid first excerpt id {:?}", entry.id);
1596 }
1597 } else {
1598 if entry.id <= excerpt_ids[ix - 1].id {
1599 panic!("excerpt ids are out-of-order: {:?}", excerpt_ids);
1600 }
1601 }
1602 }
1603 }
1604}
1605
1606impl Entity for MultiBuffer {
1607 type Event = language::Event;
1608}
1609
1610impl MultiBufferSnapshot {
1611 pub fn text(&self) -> String {
1612 self.chunks(0..self.len(), false)
1613 .map(|chunk| chunk.text)
1614 .collect()
1615 }
1616
1617 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
1618 let mut offset = position.to_offset(self);
1619 let mut cursor = self.excerpts.cursor::<usize>();
1620 cursor.seek(&offset, Bias::Left, &());
1621 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1622 let end_before_footer = cursor.start() + excerpt.text_summary.len;
1623 let start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1624 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1625 excerpt.buffer.reversed_chunks_in_range(start..end)
1626 });
1627 iter::from_fn(move || {
1628 if offset == *cursor.start() {
1629 cursor.prev(&());
1630 let excerpt = cursor.item()?;
1631 excerpt_chunks = Some(
1632 excerpt
1633 .buffer
1634 .reversed_chunks_in_range(excerpt.range.context.clone()),
1635 );
1636 }
1637
1638 let excerpt = cursor.item().unwrap();
1639 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1640 offset -= 1;
1641 Some("\n")
1642 } else {
1643 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1644 offset -= chunk.len();
1645 Some(chunk)
1646 }
1647 })
1648 .flat_map(|c| c.chars().rev())
1649 }
1650
1651 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
1652 let offset = position.to_offset(self);
1653 self.text_for_range(offset..self.len())
1654 .flat_map(|chunk| chunk.chars())
1655 }
1656
1657 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
1658 self.chunks(range, false).map(|chunk| chunk.text)
1659 }
1660
1661 pub fn is_line_blank(&self, row: u32) -> bool {
1662 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1663 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1664 }
1665
1666 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1667 where
1668 T: ToOffset,
1669 {
1670 let position = position.to_offset(self);
1671 position == self.clip_offset(position, Bias::Left)
1672 && self
1673 .bytes_in_range(position..self.len())
1674 .flatten()
1675 .copied()
1676 .take(needle.len())
1677 .eq(needle.bytes())
1678 }
1679
1680 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
1681 let mut start = start.to_offset(self);
1682 let mut end = start;
1683 let mut next_chars = self.chars_at(start).peekable();
1684 let mut prev_chars = self.reversed_chars_at(start).peekable();
1685 let word_kind = cmp::max(
1686 prev_chars.peek().copied().map(char_kind),
1687 next_chars.peek().copied().map(char_kind),
1688 );
1689
1690 for ch in prev_chars {
1691 if Some(char_kind(ch)) == word_kind && ch != '\n' {
1692 start -= ch.len_utf8();
1693 } else {
1694 break;
1695 }
1696 }
1697
1698 for ch in next_chars {
1699 if Some(char_kind(ch)) == word_kind && ch != '\n' {
1700 end += ch.len_utf8();
1701 } else {
1702 break;
1703 }
1704 }
1705
1706 (start..end, word_kind)
1707 }
1708
1709 pub fn as_singleton(&self) -> Option<(&ExcerptId, usize, &BufferSnapshot)> {
1710 if self.singleton {
1711 self.excerpts
1712 .iter()
1713 .next()
1714 .map(|e| (&e.id, e.buffer_id, &e.buffer))
1715 } else {
1716 None
1717 }
1718 }
1719
1720 pub fn len(&self) -> usize {
1721 self.excerpts.summary().text.len
1722 }
1723
1724 pub fn is_empty(&self) -> bool {
1725 self.excerpts.summary().text.len == 0
1726 }
1727
1728 pub fn max_buffer_row(&self) -> u32 {
1729 self.excerpts.summary().max_buffer_row
1730 }
1731
1732 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1733 if let Some((_, _, buffer)) = self.as_singleton() {
1734 return buffer.clip_offset(offset, bias);
1735 }
1736
1737 let mut cursor = self.excerpts.cursor::<usize>();
1738 cursor.seek(&offset, Bias::Right, &());
1739 let overshoot = if let Some(excerpt) = cursor.item() {
1740 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1741 let buffer_offset = excerpt
1742 .buffer
1743 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1744 buffer_offset.saturating_sub(excerpt_start)
1745 } else {
1746 0
1747 };
1748 cursor.start() + overshoot
1749 }
1750
1751 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1752 if let Some((_, _, buffer)) = self.as_singleton() {
1753 return buffer.clip_point(point, bias);
1754 }
1755
1756 let mut cursor = self.excerpts.cursor::<Point>();
1757 cursor.seek(&point, Bias::Right, &());
1758 let overshoot = if let Some(excerpt) = cursor.item() {
1759 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
1760 let buffer_point = excerpt
1761 .buffer
1762 .clip_point(excerpt_start + (point - cursor.start()), bias);
1763 buffer_point.saturating_sub(excerpt_start)
1764 } else {
1765 Point::zero()
1766 };
1767 *cursor.start() + overshoot
1768 }
1769
1770 pub fn clip_offset_utf16(&self, offset: OffsetUtf16, bias: Bias) -> OffsetUtf16 {
1771 if let Some((_, _, buffer)) = self.as_singleton() {
1772 return buffer.clip_offset_utf16(offset, bias);
1773 }
1774
1775 let mut cursor = self.excerpts.cursor::<OffsetUtf16>();
1776 cursor.seek(&offset, Bias::Right, &());
1777 let overshoot = if let Some(excerpt) = cursor.item() {
1778 let excerpt_start = excerpt.range.context.start.to_offset_utf16(&excerpt.buffer);
1779 let buffer_offset = excerpt
1780 .buffer
1781 .clip_offset_utf16(excerpt_start + (offset - cursor.start()), bias);
1782 OffsetUtf16(buffer_offset.0.saturating_sub(excerpt_start.0))
1783 } else {
1784 OffsetUtf16(0)
1785 };
1786 *cursor.start() + overshoot
1787 }
1788
1789 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
1790 if let Some((_, _, buffer)) = self.as_singleton() {
1791 return buffer.clip_point_utf16(point, bias);
1792 }
1793
1794 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1795 cursor.seek(&point.0, Bias::Right, &());
1796 let overshoot = if let Some(excerpt) = cursor.item() {
1797 let excerpt_start = excerpt
1798 .buffer
1799 .offset_to_point_utf16(excerpt.range.context.start.to_offset(&excerpt.buffer));
1800 let buffer_point = excerpt
1801 .buffer
1802 .clip_point_utf16(Unclipped(excerpt_start + (point.0 - cursor.start())), bias);
1803 buffer_point.saturating_sub(excerpt_start)
1804 } else {
1805 PointUtf16::zero()
1806 };
1807 *cursor.start() + overshoot
1808 }
1809
1810 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes {
1811 let range = range.start.to_offset(self)..range.end.to_offset(self);
1812 let mut excerpts = self.excerpts.cursor::<usize>();
1813 excerpts.seek(&range.start, Bias::Right, &());
1814
1815 let mut chunk = &[][..];
1816 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1817 let mut excerpt_bytes = excerpt
1818 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1819 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1820 Some(excerpt_bytes)
1821 } else {
1822 None
1823 };
1824
1825 MultiBufferBytes {
1826 range,
1827 excerpts,
1828 excerpt_bytes,
1829 chunk,
1830 }
1831 }
1832
1833 pub fn buffer_rows(&self, start_row: u32) -> MultiBufferRows {
1834 let mut result = MultiBufferRows {
1835 buffer_row_range: 0..0,
1836 excerpts: self.excerpts.cursor(),
1837 };
1838 result.seek(start_row);
1839 result
1840 }
1841
1842 pub fn chunks<T: ToOffset>(&self, range: Range<T>, language_aware: bool) -> MultiBufferChunks {
1843 let range = range.start.to_offset(self)..range.end.to_offset(self);
1844 let mut chunks = MultiBufferChunks {
1845 range: range.clone(),
1846 excerpts: self.excerpts.cursor(),
1847 excerpt_chunks: None,
1848 language_aware,
1849 };
1850 chunks.seek(range.start);
1851 chunks
1852 }
1853
1854 pub fn offset_to_point(&self, offset: usize) -> Point {
1855 if let Some((_, _, buffer)) = self.as_singleton() {
1856 return buffer.offset_to_point(offset);
1857 }
1858
1859 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1860 cursor.seek(&offset, Bias::Right, &());
1861 if let Some(excerpt) = cursor.item() {
1862 let (start_offset, start_point) = cursor.start();
1863 let overshoot = offset - start_offset;
1864 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
1865 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
1866 let buffer_point = excerpt
1867 .buffer
1868 .offset_to_point(excerpt_start_offset + overshoot);
1869 *start_point + (buffer_point - excerpt_start_point)
1870 } else {
1871 self.excerpts.summary().text.lines
1872 }
1873 }
1874
1875 pub fn offset_to_point_utf16(&self, offset: usize) -> PointUtf16 {
1876 if let Some((_, _, buffer)) = self.as_singleton() {
1877 return buffer.offset_to_point_utf16(offset);
1878 }
1879
1880 let mut cursor = self.excerpts.cursor::<(usize, PointUtf16)>();
1881 cursor.seek(&offset, Bias::Right, &());
1882 if let Some(excerpt) = cursor.item() {
1883 let (start_offset, start_point) = cursor.start();
1884 let overshoot = offset - start_offset;
1885 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
1886 let excerpt_start_point = excerpt.range.context.start.to_point_utf16(&excerpt.buffer);
1887 let buffer_point = excerpt
1888 .buffer
1889 .offset_to_point_utf16(excerpt_start_offset + overshoot);
1890 *start_point + (buffer_point - excerpt_start_point)
1891 } else {
1892 self.excerpts.summary().text.lines_utf16()
1893 }
1894 }
1895
1896 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
1897 if let Some((_, _, buffer)) = self.as_singleton() {
1898 return buffer.point_to_point_utf16(point);
1899 }
1900
1901 let mut cursor = self.excerpts.cursor::<(Point, PointUtf16)>();
1902 cursor.seek(&point, Bias::Right, &());
1903 if let Some(excerpt) = cursor.item() {
1904 let (start_offset, start_point) = cursor.start();
1905 let overshoot = point - start_offset;
1906 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
1907 let excerpt_start_point_utf16 =
1908 excerpt.range.context.start.to_point_utf16(&excerpt.buffer);
1909 let buffer_point = excerpt
1910 .buffer
1911 .point_to_point_utf16(excerpt_start_point + overshoot);
1912 *start_point + (buffer_point - excerpt_start_point_utf16)
1913 } else {
1914 self.excerpts.summary().text.lines_utf16()
1915 }
1916 }
1917
1918 pub fn point_to_offset(&self, point: Point) -> usize {
1919 if let Some((_, _, buffer)) = self.as_singleton() {
1920 return buffer.point_to_offset(point);
1921 }
1922
1923 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1924 cursor.seek(&point, Bias::Right, &());
1925 if let Some(excerpt) = cursor.item() {
1926 let (start_point, start_offset) = cursor.start();
1927 let overshoot = point - start_point;
1928 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
1929 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
1930 let buffer_offset = excerpt
1931 .buffer
1932 .point_to_offset(excerpt_start_point + overshoot);
1933 *start_offset + buffer_offset - excerpt_start_offset
1934 } else {
1935 self.excerpts.summary().text.len
1936 }
1937 }
1938
1939 pub fn offset_utf16_to_offset(&self, offset_utf16: OffsetUtf16) -> usize {
1940 if let Some((_, _, buffer)) = self.as_singleton() {
1941 return buffer.offset_utf16_to_offset(offset_utf16);
1942 }
1943
1944 let mut cursor = self.excerpts.cursor::<(OffsetUtf16, usize)>();
1945 cursor.seek(&offset_utf16, Bias::Right, &());
1946 if let Some(excerpt) = cursor.item() {
1947 let (start_offset_utf16, start_offset) = cursor.start();
1948 let overshoot = offset_utf16 - start_offset_utf16;
1949 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
1950 let excerpt_start_offset_utf16 =
1951 excerpt.buffer.offset_to_offset_utf16(excerpt_start_offset);
1952 let buffer_offset = excerpt
1953 .buffer
1954 .offset_utf16_to_offset(excerpt_start_offset_utf16 + overshoot);
1955 *start_offset + (buffer_offset - excerpt_start_offset)
1956 } else {
1957 self.excerpts.summary().text.len
1958 }
1959 }
1960
1961 pub fn offset_to_offset_utf16(&self, offset: usize) -> OffsetUtf16 {
1962 if let Some((_, _, buffer)) = self.as_singleton() {
1963 return buffer.offset_to_offset_utf16(offset);
1964 }
1965
1966 let mut cursor = self.excerpts.cursor::<(usize, OffsetUtf16)>();
1967 cursor.seek(&offset, Bias::Right, &());
1968 if let Some(excerpt) = cursor.item() {
1969 let (start_offset, start_offset_utf16) = cursor.start();
1970 let overshoot = offset - start_offset;
1971 let excerpt_start_offset_utf16 =
1972 excerpt.range.context.start.to_offset_utf16(&excerpt.buffer);
1973 let excerpt_start_offset = excerpt
1974 .buffer
1975 .offset_utf16_to_offset(excerpt_start_offset_utf16);
1976 let buffer_offset_utf16 = excerpt
1977 .buffer
1978 .offset_to_offset_utf16(excerpt_start_offset + overshoot);
1979 *start_offset_utf16 + (buffer_offset_utf16 - excerpt_start_offset_utf16)
1980 } else {
1981 self.excerpts.summary().text.len_utf16
1982 }
1983 }
1984
1985 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1986 if let Some((_, _, buffer)) = self.as_singleton() {
1987 return buffer.point_utf16_to_offset(point);
1988 }
1989
1990 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1991 cursor.seek(&point, Bias::Right, &());
1992 if let Some(excerpt) = cursor.item() {
1993 let (start_point, start_offset) = cursor.start();
1994 let overshoot = point - start_point;
1995 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
1996 let excerpt_start_point = excerpt
1997 .buffer
1998 .offset_to_point_utf16(excerpt.range.context.start.to_offset(&excerpt.buffer));
1999 let buffer_offset = excerpt
2000 .buffer
2001 .point_utf16_to_offset(excerpt_start_point + overshoot);
2002 *start_offset + (buffer_offset - excerpt_start_offset)
2003 } else {
2004 self.excerpts.summary().text.len
2005 }
2006 }
2007
2008 pub fn point_to_buffer_offset<T: ToOffset>(
2009 &self,
2010 point: T,
2011 ) -> Option<(&BufferSnapshot, usize)> {
2012 let offset = point.to_offset(&self);
2013 let mut cursor = self.excerpts.cursor::<usize>();
2014 cursor.seek(&offset, Bias::Right, &());
2015 if cursor.item().is_none() {
2016 cursor.prev(&());
2017 }
2018
2019 cursor.item().map(|excerpt| {
2020 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2021 let buffer_point = excerpt_start + offset - *cursor.start();
2022 (&excerpt.buffer, buffer_point)
2023 })
2024 }
2025
2026 pub fn suggested_indents(
2027 &self,
2028 rows: impl IntoIterator<Item = u32>,
2029 cx: &AppContext,
2030 ) -> BTreeMap<u32, IndentSize> {
2031 let mut result = BTreeMap::new();
2032
2033 let mut rows_for_excerpt = Vec::new();
2034 let mut cursor = self.excerpts.cursor::<Point>();
2035 let mut rows = rows.into_iter().peekable();
2036 let mut prev_row = u32::MAX;
2037 let mut prev_language_indent_size = IndentSize::default();
2038
2039 while let Some(row) = rows.next() {
2040 cursor.seek(&Point::new(row, 0), Bias::Right, &());
2041 let excerpt = match cursor.item() {
2042 Some(excerpt) => excerpt,
2043 _ => continue,
2044 };
2045
2046 // Retrieve the language and indent size once for each disjoint region being indented.
2047 let single_indent_size = if row.saturating_sub(1) == prev_row {
2048 prev_language_indent_size
2049 } else {
2050 excerpt
2051 .buffer
2052 .language_indent_size_at(Point::new(row, 0), cx)
2053 };
2054 prev_language_indent_size = single_indent_size;
2055 prev_row = row;
2056
2057 let start_buffer_row = excerpt.range.context.start.to_point(&excerpt.buffer).row;
2058 let start_multibuffer_row = cursor.start().row;
2059
2060 rows_for_excerpt.push(row);
2061 while let Some(next_row) = rows.peek().copied() {
2062 if cursor.end(&()).row > next_row {
2063 rows_for_excerpt.push(next_row);
2064 rows.next();
2065 } else {
2066 break;
2067 }
2068 }
2069
2070 let buffer_rows = rows_for_excerpt
2071 .drain(..)
2072 .map(|row| start_buffer_row + row - start_multibuffer_row);
2073 let buffer_indents = excerpt
2074 .buffer
2075 .suggested_indents(buffer_rows, single_indent_size);
2076 let multibuffer_indents = buffer_indents
2077 .into_iter()
2078 .map(|(row, indent)| (start_multibuffer_row + row - start_buffer_row, indent));
2079 result.extend(multibuffer_indents);
2080 }
2081
2082 result
2083 }
2084
2085 pub fn indent_size_for_line(&self, row: u32) -> IndentSize {
2086 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
2087 let mut size = buffer.indent_size_for_line(range.start.row);
2088 size.len = size
2089 .len
2090 .min(range.end.column)
2091 .saturating_sub(range.start.column);
2092 size
2093 } else {
2094 IndentSize::spaces(0)
2095 }
2096 }
2097
2098 pub fn line_len(&self, row: u32) -> u32 {
2099 if let Some((_, range)) = self.buffer_line_for_row(row) {
2100 range.end.column - range.start.column
2101 } else {
2102 0
2103 }
2104 }
2105
2106 pub fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
2107 let mut cursor = self.excerpts.cursor::<Point>();
2108 cursor.seek(&Point::new(row, 0), Bias::Right, &());
2109 if let Some(excerpt) = cursor.item() {
2110 let overshoot = row - cursor.start().row;
2111 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
2112 let excerpt_end = excerpt.range.context.end.to_point(&excerpt.buffer);
2113 let buffer_row = excerpt_start.row + overshoot;
2114 let line_start = Point::new(buffer_row, 0);
2115 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
2116 return Some((
2117 &excerpt.buffer,
2118 line_start.max(excerpt_start)..line_end.min(excerpt_end),
2119 ));
2120 }
2121 None
2122 }
2123
2124 pub fn max_point(&self) -> Point {
2125 self.text_summary().lines
2126 }
2127
2128 pub fn text_summary(&self) -> TextSummary {
2129 self.excerpts.summary().text.clone()
2130 }
2131
2132 pub fn text_summary_for_range<D, O>(&self, range: Range<O>) -> D
2133 where
2134 D: TextDimension,
2135 O: ToOffset,
2136 {
2137 let mut summary = D::default();
2138 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
2139 let mut cursor = self.excerpts.cursor::<usize>();
2140 cursor.seek(&range.start, Bias::Right, &());
2141 if let Some(excerpt) = cursor.item() {
2142 let mut end_before_newline = cursor.end(&());
2143 if excerpt.has_trailing_newline {
2144 end_before_newline -= 1;
2145 }
2146
2147 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2148 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
2149 let end_in_excerpt =
2150 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
2151 summary.add_assign(
2152 &excerpt
2153 .buffer
2154 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
2155 );
2156
2157 if range.end > end_before_newline {
2158 summary.add_assign(&D::from_text_summary(&TextSummary::from("\n")));
2159 }
2160
2161 cursor.next(&());
2162 }
2163
2164 if range.end > *cursor.start() {
2165 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
2166 &range.end,
2167 Bias::Right,
2168 &(),
2169 )));
2170 if let Some(excerpt) = cursor.item() {
2171 range.end = cmp::max(*cursor.start(), range.end);
2172
2173 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2174 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
2175 summary.add_assign(
2176 &excerpt
2177 .buffer
2178 .text_summary_for_range(excerpt_start..end_in_excerpt),
2179 );
2180 }
2181 }
2182
2183 summary
2184 }
2185
2186 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
2187 where
2188 D: TextDimension + Ord + Sub<D, Output = D>,
2189 {
2190 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2191 let locator = self.excerpt_locator_for_id(anchor.excerpt_id);
2192
2193 cursor.seek(locator, Bias::Left, &());
2194 if cursor.item().is_none() {
2195 cursor.next(&());
2196 }
2197
2198 let mut position = D::from_text_summary(&cursor.start().text);
2199 if let Some(excerpt) = cursor.item() {
2200 if excerpt.id == anchor.excerpt_id {
2201 let excerpt_buffer_start =
2202 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
2203 let excerpt_buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
2204 let buffer_position = cmp::min(
2205 excerpt_buffer_end,
2206 anchor.text_anchor.summary::<D>(&excerpt.buffer),
2207 );
2208 if buffer_position > excerpt_buffer_start {
2209 position.add_assign(&(buffer_position - excerpt_buffer_start));
2210 }
2211 }
2212 }
2213 position
2214 }
2215
2216 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
2217 where
2218 D: TextDimension + Ord + Sub<D, Output = D>,
2219 I: 'a + IntoIterator<Item = &'a Anchor>,
2220 {
2221 if let Some((_, _, buffer)) = self.as_singleton() {
2222 return buffer
2223 .summaries_for_anchors(anchors.into_iter().map(|a| &a.text_anchor))
2224 .collect();
2225 }
2226
2227 let mut anchors = anchors.into_iter().peekable();
2228 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2229 let mut summaries = Vec::new();
2230 while let Some(anchor) = anchors.peek() {
2231 let excerpt_id = anchor.excerpt_id;
2232 let excerpt_anchors = iter::from_fn(|| {
2233 let anchor = anchors.peek()?;
2234 if anchor.excerpt_id == excerpt_id {
2235 Some(&anchors.next().unwrap().text_anchor)
2236 } else {
2237 None
2238 }
2239 });
2240
2241 let locator = self.excerpt_locator_for_id(excerpt_id);
2242 cursor.seek_forward(locator, Bias::Left, &());
2243 if cursor.item().is_none() {
2244 cursor.next(&());
2245 }
2246
2247 let position = D::from_text_summary(&cursor.start().text);
2248 if let Some(excerpt) = cursor.item() {
2249 if excerpt.id == excerpt_id {
2250 let excerpt_buffer_start =
2251 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
2252 let excerpt_buffer_end =
2253 excerpt.range.context.end.summary::<D>(&excerpt.buffer);
2254 summaries.extend(
2255 excerpt
2256 .buffer
2257 .summaries_for_anchors::<D, _>(excerpt_anchors)
2258 .map(move |summary| {
2259 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
2260 let mut position = position.clone();
2261 let excerpt_buffer_start = excerpt_buffer_start.clone();
2262 if summary > excerpt_buffer_start {
2263 position.add_assign(&(summary - excerpt_buffer_start));
2264 }
2265 position
2266 }),
2267 );
2268 continue;
2269 }
2270 }
2271
2272 summaries.extend(excerpt_anchors.map(|_| position.clone()));
2273 }
2274
2275 summaries
2276 }
2277
2278 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
2279 where
2280 I: 'a + IntoIterator<Item = &'a Anchor>,
2281 {
2282 let mut anchors = anchors.into_iter().enumerate().peekable();
2283 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2284 cursor.next(&());
2285
2286 let mut result = Vec::new();
2287
2288 while let Some((_, anchor)) = anchors.peek() {
2289 let old_excerpt_id = anchor.excerpt_id;
2290
2291 // Find the location where this anchor's excerpt should be.
2292 let old_locator = self.excerpt_locator_for_id(old_excerpt_id);
2293 cursor.seek_forward(&Some(old_locator), Bias::Left, &());
2294
2295 if cursor.item().is_none() {
2296 cursor.next(&());
2297 }
2298
2299 let next_excerpt = cursor.item();
2300 let prev_excerpt = cursor.prev_item();
2301
2302 // Process all of the anchors for this excerpt.
2303 while let Some((_, anchor)) = anchors.peek() {
2304 if anchor.excerpt_id != old_excerpt_id {
2305 break;
2306 }
2307 let (anchor_ix, anchor) = anchors.next().unwrap();
2308 let mut anchor = *anchor;
2309
2310 // Leave min and max anchors unchanged if invalid or
2311 // if the old excerpt still exists at this location
2312 let mut kept_position = next_excerpt
2313 .map_or(false, |e| e.id == old_excerpt_id && e.contains(&anchor))
2314 || old_excerpt_id == ExcerptId::max()
2315 || old_excerpt_id == ExcerptId::min();
2316
2317 // If the old excerpt no longer exists at this location, then attempt to
2318 // find an equivalent position for this anchor in an adjacent excerpt.
2319 if !kept_position {
2320 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
2321 if excerpt.contains(&anchor) {
2322 anchor.excerpt_id = excerpt.id.clone();
2323 kept_position = true;
2324 break;
2325 }
2326 }
2327 }
2328
2329 // If there's no adjacent excerpt that contains the anchor's position,
2330 // then report that the anchor has lost its position.
2331 if !kept_position {
2332 anchor = if let Some(excerpt) = next_excerpt {
2333 let mut text_anchor = excerpt
2334 .range
2335 .context
2336 .start
2337 .bias(anchor.text_anchor.bias, &excerpt.buffer);
2338 if text_anchor
2339 .cmp(&excerpt.range.context.end, &excerpt.buffer)
2340 .is_gt()
2341 {
2342 text_anchor = excerpt.range.context.end;
2343 }
2344 Anchor {
2345 buffer_id: Some(excerpt.buffer_id),
2346 excerpt_id: excerpt.id.clone(),
2347 text_anchor,
2348 }
2349 } else if let Some(excerpt) = prev_excerpt {
2350 let mut text_anchor = excerpt
2351 .range
2352 .context
2353 .end
2354 .bias(anchor.text_anchor.bias, &excerpt.buffer);
2355 if text_anchor
2356 .cmp(&excerpt.range.context.start, &excerpt.buffer)
2357 .is_lt()
2358 {
2359 text_anchor = excerpt.range.context.start;
2360 }
2361 Anchor {
2362 buffer_id: Some(excerpt.buffer_id),
2363 excerpt_id: excerpt.id.clone(),
2364 text_anchor,
2365 }
2366 } else if anchor.text_anchor.bias == Bias::Left {
2367 Anchor::min()
2368 } else {
2369 Anchor::max()
2370 };
2371 }
2372
2373 result.push((anchor_ix, anchor, kept_position));
2374 }
2375 }
2376 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self));
2377 result
2378 }
2379
2380 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
2381 self.anchor_at(position, Bias::Left)
2382 }
2383
2384 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
2385 self.anchor_at(position, Bias::Right)
2386 }
2387
2388 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
2389 let offset = position.to_offset(self);
2390 if let Some((excerpt_id, buffer_id, buffer)) = self.as_singleton() {
2391 return Anchor {
2392 buffer_id: Some(buffer_id),
2393 excerpt_id: excerpt_id.clone(),
2394 text_anchor: buffer.anchor_at(offset, bias),
2395 };
2396 }
2397
2398 let mut cursor = self.excerpts.cursor::<(usize, Option<ExcerptId>)>();
2399 cursor.seek(&offset, Bias::Right, &());
2400 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
2401 cursor.prev(&());
2402 }
2403 if let Some(excerpt) = cursor.item() {
2404 let mut overshoot = offset.saturating_sub(cursor.start().0);
2405 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
2406 overshoot -= 1;
2407 bias = Bias::Right;
2408 }
2409
2410 let buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2411 let text_anchor =
2412 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
2413 Anchor {
2414 buffer_id: Some(excerpt.buffer_id),
2415 excerpt_id: excerpt.id.clone(),
2416 text_anchor,
2417 }
2418 } else if offset == 0 && bias == Bias::Left {
2419 Anchor::min()
2420 } else {
2421 Anchor::max()
2422 }
2423 }
2424
2425 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
2426 let locator = self.excerpt_locator_for_id(excerpt_id);
2427 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2428 cursor.seek(locator, Bias::Left, &());
2429 if let Some(excerpt) = cursor.item() {
2430 if excerpt.id == excerpt_id {
2431 let text_anchor = excerpt.clip_anchor(text_anchor);
2432 drop(cursor);
2433 return Anchor {
2434 buffer_id: Some(excerpt.buffer_id),
2435 excerpt_id,
2436 text_anchor,
2437 };
2438 }
2439 }
2440 panic!("excerpt not found");
2441 }
2442
2443 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
2444 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
2445 true
2446 } else if let Some(excerpt) = self.excerpt(anchor.excerpt_id) {
2447 excerpt.buffer.can_resolve(&anchor.text_anchor)
2448 } else {
2449 false
2450 }
2451 }
2452
2453 pub fn excerpt_boundaries_in_range<R, T>(
2454 &self,
2455 range: R,
2456 ) -> impl Iterator<Item = ExcerptBoundary> + '_
2457 where
2458 R: RangeBounds<T>,
2459 T: ToOffset,
2460 {
2461 let start_offset;
2462 let start = match range.start_bound() {
2463 Bound::Included(start) => {
2464 start_offset = start.to_offset(self);
2465 Bound::Included(start_offset)
2466 }
2467 Bound::Excluded(start) => {
2468 start_offset = start.to_offset(self);
2469 Bound::Excluded(start_offset)
2470 }
2471 Bound::Unbounded => {
2472 start_offset = 0;
2473 Bound::Unbounded
2474 }
2475 };
2476 let end = match range.end_bound() {
2477 Bound::Included(end) => Bound::Included(end.to_offset(self)),
2478 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
2479 Bound::Unbounded => Bound::Unbounded,
2480 };
2481 let bounds = (start, end);
2482
2483 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
2484 cursor.seek(&start_offset, Bias::Right, &());
2485 if cursor.item().is_none() {
2486 cursor.prev(&());
2487 }
2488 if !bounds.contains(&cursor.start().0) {
2489 cursor.next(&());
2490 }
2491
2492 let mut prev_buffer_id = cursor.prev_item().map(|excerpt| excerpt.buffer_id);
2493 std::iter::from_fn(move || {
2494 if self.singleton {
2495 None
2496 } else if bounds.contains(&cursor.start().0) {
2497 let excerpt = cursor.item()?;
2498 let starts_new_buffer = Some(excerpt.buffer_id) != prev_buffer_id;
2499 let boundary = ExcerptBoundary {
2500 id: excerpt.id.clone(),
2501 row: cursor.start().1.row,
2502 buffer: excerpt.buffer.clone(),
2503 range: excerpt.range.clone(),
2504 starts_new_buffer,
2505 };
2506
2507 prev_buffer_id = Some(excerpt.buffer_id);
2508 cursor.next(&());
2509 Some(boundary)
2510 } else {
2511 None
2512 }
2513 })
2514 }
2515
2516 pub fn edit_count(&self) -> usize {
2517 self.edit_count
2518 }
2519
2520 pub fn parse_count(&self) -> usize {
2521 self.parse_count
2522 }
2523
2524 pub fn enclosing_bracket_ranges<T: ToOffset>(
2525 &self,
2526 range: Range<T>,
2527 ) -> Option<(Range<usize>, Range<usize>)> {
2528 let range = range.start.to_offset(self)..range.end.to_offset(self);
2529
2530 let mut cursor = self.excerpts.cursor::<usize>();
2531 cursor.seek(&range.start, Bias::Right, &());
2532 let start_excerpt = cursor.item();
2533
2534 cursor.seek(&range.end, Bias::Right, &());
2535 let end_excerpt = cursor.item();
2536
2537 start_excerpt
2538 .zip(end_excerpt)
2539 .and_then(|(start_excerpt, end_excerpt)| {
2540 if start_excerpt.id != end_excerpt.id {
2541 return None;
2542 }
2543
2544 let excerpt_buffer_start = start_excerpt
2545 .range
2546 .context
2547 .start
2548 .to_offset(&start_excerpt.buffer);
2549 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.len;
2550
2551 let start_in_buffer =
2552 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
2553 let end_in_buffer =
2554 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
2555 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
2556 .buffer
2557 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
2558
2559 if start_bracket_range.start >= excerpt_buffer_start
2560 && end_bracket_range.end <= excerpt_buffer_end
2561 {
2562 start_bracket_range.start =
2563 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
2564 start_bracket_range.end =
2565 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
2566 end_bracket_range.start =
2567 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
2568 end_bracket_range.end =
2569 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
2570 Some((start_bracket_range, end_bracket_range))
2571 } else {
2572 None
2573 }
2574 })
2575 }
2576
2577 pub fn diagnostics_update_count(&self) -> usize {
2578 self.diagnostics_update_count
2579 }
2580
2581 pub fn git_diff_update_count(&self) -> usize {
2582 self.git_diff_update_count
2583 }
2584
2585 pub fn trailing_excerpt_update_count(&self) -> usize {
2586 self.trailing_excerpt_update_count
2587 }
2588
2589 pub fn language_at<'a, T: ToOffset>(&'a self, point: T) -> Option<&'a Arc<Language>> {
2590 self.point_to_buffer_offset(point)
2591 .and_then(|(buffer, offset)| buffer.language_at(offset))
2592 }
2593
2594 pub fn is_dirty(&self) -> bool {
2595 self.is_dirty
2596 }
2597
2598 pub fn has_conflict(&self) -> bool {
2599 self.has_conflict
2600 }
2601
2602 pub fn diagnostic_group<'a, O>(
2603 &'a self,
2604 group_id: usize,
2605 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
2606 where
2607 O: text::FromAnchor + 'a,
2608 {
2609 self.as_singleton()
2610 .into_iter()
2611 .flat_map(move |(_, _, buffer)| buffer.diagnostic_group(group_id))
2612 }
2613
2614 pub fn diagnostics_in_range<'a, T, O>(
2615 &'a self,
2616 range: Range<T>,
2617 reversed: bool,
2618 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
2619 where
2620 T: 'a + ToOffset,
2621 O: 'a + text::FromAnchor,
2622 {
2623 self.as_singleton()
2624 .into_iter()
2625 .flat_map(move |(_, _, buffer)| {
2626 buffer.diagnostics_in_range(
2627 range.start.to_offset(self)..range.end.to_offset(self),
2628 reversed,
2629 )
2630 })
2631 }
2632
2633 pub fn git_diff_hunks_in_range<'a>(
2634 &'a self,
2635 row_range: Range<u32>,
2636 reversed: bool,
2637 ) -> impl 'a + Iterator<Item = DiffHunk<u32>> {
2638 // dbg!(&row_range);
2639 let mut lines_advance = 0;
2640 let mut cursor = self.excerpts.filter::<_, ExcerptSummary>(move |summary| {
2641 let filter = summary.text.lines.row + lines_advance >= row_range.start
2642 && lines_advance <= row_range.end;
2643 lines_advance += summary.text.lines.row;
2644 filter
2645 });
2646
2647 let mut lines_advance = 0;
2648 std::iter::from_fn(move || {
2649 cursor.next(&());
2650 let excerpt = cursor.item()?;
2651 let summary = cursor.item_summary()?;
2652
2653 let range = excerpt.range.context.clone();
2654 let range_start_row = range.start.to_point(&excerpt.buffer).row;
2655 let range_end_row = range.end.to_point(&excerpt.buffer).row;
2656 // dbg!(range_start_row);
2657 let a = Some(excerpt.buffer.git_diff_hunks_in_range(range, reversed).map(
2658 move |mut hunk| {
2659 hunk.buffer_range.start = hunk.buffer_range.start.max(range_start_row)
2660 - range_start_row
2661 + lines_advance;
2662 hunk.buffer_range.end = hunk.buffer_range.end.max(range_start_row)
2663 - range_start_row
2664 + lines_advance;
2665 hunk
2666 },
2667 ));
2668 lines_advance += summary.text.lines.row;
2669 a
2670 })
2671 .flatten()
2672 // let mut cursor = self.excerpts.cursor::<Point>();
2673 // cursor.seek(&Point::new(row_range.start, 0), Bias::Left, &());
2674
2675 // let mut is_first = true;
2676 // let mut advance = 0;
2677 // std::iter::from_fn(move || {
2678 // if !is_first {
2679 // cursor.next(&());
2680 // }
2681 // is_first = false;
2682
2683 // let (item, summary) = match (cursor.item(), cursor.item_summary()) {
2684 // (Some(item), Some(summary)) => (item, summary),
2685 // _ => return None,
2686 // };
2687
2688 // // dbg!(&advance);
2689 // // if advance > row_range.end {
2690 // // println!("returning none");
2691 // // return None;
2692 // // }
2693
2694 // // let row_range = row_range.start - advance..row_range.end - advance;
2695 // // println!("returning an iterator, {row_range:?}");
2696 // // // summary.
2697 // // advance += summary.text.lines.row;
2698 // Some(item.buffer.git_diff_hunks_in_range(row_range, reversed))
2699
2700 // item.range
2701 // })
2702 // .flatten()
2703 }
2704
2705 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
2706 let range = range.start.to_offset(self)..range.end.to_offset(self);
2707
2708 let mut cursor = self.excerpts.cursor::<usize>();
2709 cursor.seek(&range.start, Bias::Right, &());
2710 let start_excerpt = cursor.item();
2711
2712 cursor.seek(&range.end, Bias::Right, &());
2713 let end_excerpt = cursor.item();
2714
2715 start_excerpt
2716 .zip(end_excerpt)
2717 .and_then(|(start_excerpt, end_excerpt)| {
2718 if start_excerpt.id != end_excerpt.id {
2719 return None;
2720 }
2721
2722 let excerpt_buffer_start = start_excerpt
2723 .range
2724 .context
2725 .start
2726 .to_offset(&start_excerpt.buffer);
2727 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.len;
2728
2729 let start_in_buffer =
2730 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
2731 let end_in_buffer =
2732 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
2733 let mut ancestor_buffer_range = start_excerpt
2734 .buffer
2735 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
2736 ancestor_buffer_range.start =
2737 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
2738 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
2739
2740 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
2741 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
2742 Some(start..end)
2743 })
2744 }
2745
2746 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
2747 let (excerpt_id, _, buffer) = self.as_singleton()?;
2748 let outline = buffer.outline(theme)?;
2749 Some(Outline::new(
2750 outline
2751 .items
2752 .into_iter()
2753 .map(|item| OutlineItem {
2754 depth: item.depth,
2755 range: self.anchor_in_excerpt(excerpt_id.clone(), item.range.start)
2756 ..self.anchor_in_excerpt(excerpt_id.clone(), item.range.end),
2757 text: item.text,
2758 highlight_ranges: item.highlight_ranges,
2759 name_ranges: item.name_ranges,
2760 })
2761 .collect(),
2762 ))
2763 }
2764
2765 pub fn symbols_containing<T: ToOffset>(
2766 &self,
2767 offset: T,
2768 theme: Option<&SyntaxTheme>,
2769 ) -> Option<(usize, Vec<OutlineItem<Anchor>>)> {
2770 let anchor = self.anchor_before(offset);
2771 let excerpt_id = anchor.excerpt_id();
2772 let excerpt = self.excerpt(excerpt_id)?;
2773 Some((
2774 excerpt.buffer_id,
2775 excerpt
2776 .buffer
2777 .symbols_containing(anchor.text_anchor, theme)
2778 .into_iter()
2779 .flatten()
2780 .map(|item| OutlineItem {
2781 depth: item.depth,
2782 range: self.anchor_in_excerpt(excerpt_id, item.range.start)
2783 ..self.anchor_in_excerpt(excerpt_id, item.range.end),
2784 text: item.text,
2785 highlight_ranges: item.highlight_ranges,
2786 name_ranges: item.name_ranges,
2787 })
2788 .collect(),
2789 ))
2790 }
2791
2792 fn excerpt_locator_for_id<'a>(&'a self, id: ExcerptId) -> &'a Locator {
2793 if id == ExcerptId::min() {
2794 Locator::min_ref()
2795 } else if id == ExcerptId::max() {
2796 Locator::max_ref()
2797 } else {
2798 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>();
2799 cursor.seek(&id, Bias::Left, &());
2800 if let Some(entry) = cursor.item() {
2801 if entry.id == id {
2802 return &entry.locator;
2803 }
2804 }
2805 panic!("invalid excerpt id {:?}", id)
2806 }
2807 }
2808
2809 fn excerpt<'a>(&'a self, excerpt_id: ExcerptId) -> Option<&'a Excerpt> {
2810 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2811 let locator = self.excerpt_locator_for_id(excerpt_id);
2812 cursor.seek(&Some(locator), Bias::Left, &());
2813 if let Some(excerpt) = cursor.item() {
2814 if excerpt.id == excerpt_id {
2815 return Some(excerpt);
2816 }
2817 }
2818 None
2819 }
2820
2821 pub fn remote_selections_in_range<'a>(
2822 &'a self,
2823 range: &'a Range<Anchor>,
2824 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
2825 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2826 let start_locator = self.excerpt_locator_for_id(range.start.excerpt_id);
2827 let end_locator = self.excerpt_locator_for_id(range.end.excerpt_id);
2828 cursor.seek(start_locator, Bias::Left, &());
2829 cursor
2830 .take_while(move |excerpt| excerpt.locator <= *end_locator)
2831 .flat_map(move |excerpt| {
2832 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
2833 if excerpt.id == range.start.excerpt_id {
2834 query_range.start = range.start.text_anchor;
2835 }
2836 if excerpt.id == range.end.excerpt_id {
2837 query_range.end = range.end.text_anchor;
2838 }
2839
2840 excerpt
2841 .buffer
2842 .remote_selections_in_range(query_range)
2843 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
2844 selections.map(move |selection| {
2845 let mut start = Anchor {
2846 buffer_id: Some(excerpt.buffer_id),
2847 excerpt_id: excerpt.id.clone(),
2848 text_anchor: selection.start,
2849 };
2850 let mut end = Anchor {
2851 buffer_id: Some(excerpt.buffer_id),
2852 excerpt_id: excerpt.id.clone(),
2853 text_anchor: selection.end,
2854 };
2855 if range.start.cmp(&start, self).is_gt() {
2856 start = range.start.clone();
2857 }
2858 if range.end.cmp(&end, self).is_lt() {
2859 end = range.end.clone();
2860 }
2861
2862 (
2863 replica_id,
2864 line_mode,
2865 cursor_shape,
2866 Selection {
2867 id: selection.id,
2868 start,
2869 end,
2870 reversed: selection.reversed,
2871 goal: selection.goal,
2872 },
2873 )
2874 })
2875 })
2876 })
2877 }
2878}
2879
2880#[cfg(any(test, feature = "test-support"))]
2881impl MultiBufferSnapshot {
2882 pub fn random_byte_range(&self, start_offset: usize, rng: &mut impl rand::Rng) -> Range<usize> {
2883 let end = self.clip_offset(rng.gen_range(start_offset..=self.len()), Bias::Right);
2884 let start = self.clip_offset(rng.gen_range(start_offset..=end), Bias::Right);
2885 start..end
2886 }
2887}
2888
2889impl History {
2890 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
2891 self.transaction_depth += 1;
2892 if self.transaction_depth == 1 {
2893 let id = self.next_transaction_id.tick();
2894 self.undo_stack.push(Transaction {
2895 id,
2896 buffer_transactions: Default::default(),
2897 first_edit_at: now,
2898 last_edit_at: now,
2899 suppress_grouping: false,
2900 });
2901 Some(id)
2902 } else {
2903 None
2904 }
2905 }
2906
2907 fn end_transaction(
2908 &mut self,
2909 now: Instant,
2910 buffer_transactions: HashMap<usize, TransactionId>,
2911 ) -> bool {
2912 assert_ne!(self.transaction_depth, 0);
2913 self.transaction_depth -= 1;
2914 if self.transaction_depth == 0 {
2915 if buffer_transactions.is_empty() {
2916 self.undo_stack.pop();
2917 false
2918 } else {
2919 self.redo_stack.clear();
2920 let transaction = self.undo_stack.last_mut().unwrap();
2921 transaction.last_edit_at = now;
2922 for (buffer_id, transaction_id) in buffer_transactions {
2923 transaction
2924 .buffer_transactions
2925 .entry(buffer_id)
2926 .or_insert(transaction_id);
2927 }
2928 true
2929 }
2930 } else {
2931 false
2932 }
2933 }
2934
2935 fn push_transaction<'a, T>(&mut self, buffer_transactions: T, now: Instant)
2936 where
2937 T: IntoIterator<Item = (&'a ModelHandle<Buffer>, &'a language::Transaction)>,
2938 {
2939 assert_eq!(self.transaction_depth, 0);
2940 let transaction = Transaction {
2941 id: self.next_transaction_id.tick(),
2942 buffer_transactions: buffer_transactions
2943 .into_iter()
2944 .map(|(buffer, transaction)| (buffer.id(), transaction.id))
2945 .collect(),
2946 first_edit_at: now,
2947 last_edit_at: now,
2948 suppress_grouping: false,
2949 };
2950 if !transaction.buffer_transactions.is_empty() {
2951 self.undo_stack.push(transaction);
2952 self.redo_stack.clear();
2953 }
2954 }
2955
2956 fn finalize_last_transaction(&mut self) {
2957 if let Some(transaction) = self.undo_stack.last_mut() {
2958 transaction.suppress_grouping = true;
2959 }
2960 }
2961
2962 fn pop_undo(&mut self) -> Option<&mut Transaction> {
2963 assert_eq!(self.transaction_depth, 0);
2964 if let Some(transaction) = self.undo_stack.pop() {
2965 self.redo_stack.push(transaction);
2966 self.redo_stack.last_mut()
2967 } else {
2968 None
2969 }
2970 }
2971
2972 fn pop_redo(&mut self) -> Option<&mut Transaction> {
2973 assert_eq!(self.transaction_depth, 0);
2974 if let Some(transaction) = self.redo_stack.pop() {
2975 self.undo_stack.push(transaction);
2976 self.undo_stack.last_mut()
2977 } else {
2978 None
2979 }
2980 }
2981
2982 fn group(&mut self) -> Option<TransactionId> {
2983 let mut count = 0;
2984 let mut transactions = self.undo_stack.iter();
2985 if let Some(mut transaction) = transactions.next_back() {
2986 while let Some(prev_transaction) = transactions.next_back() {
2987 if !prev_transaction.suppress_grouping
2988 && transaction.first_edit_at - prev_transaction.last_edit_at
2989 <= self.group_interval
2990 {
2991 transaction = prev_transaction;
2992 count += 1;
2993 } else {
2994 break;
2995 }
2996 }
2997 }
2998 self.group_trailing(count)
2999 }
3000
3001 fn group_until(&mut self, transaction_id: TransactionId) {
3002 let mut count = 0;
3003 for transaction in self.undo_stack.iter().rev() {
3004 if transaction.id == transaction_id {
3005 self.group_trailing(count);
3006 break;
3007 } else if transaction.suppress_grouping {
3008 break;
3009 } else {
3010 count += 1;
3011 }
3012 }
3013 }
3014
3015 fn group_trailing(&mut self, n: usize) -> Option<TransactionId> {
3016 let new_len = self.undo_stack.len() - n;
3017 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
3018 if let Some(last_transaction) = transactions_to_keep.last_mut() {
3019 if let Some(transaction) = transactions_to_merge.last() {
3020 last_transaction.last_edit_at = transaction.last_edit_at;
3021 }
3022 for to_merge in transactions_to_merge {
3023 for (buffer_id, transaction_id) in &to_merge.buffer_transactions {
3024 last_transaction
3025 .buffer_transactions
3026 .entry(*buffer_id)
3027 .or_insert(*transaction_id);
3028 }
3029 }
3030 }
3031
3032 self.undo_stack.truncate(new_len);
3033 self.undo_stack.last().map(|t| t.id)
3034 }
3035}
3036
3037impl Excerpt {
3038 fn new(
3039 id: ExcerptId,
3040 locator: Locator,
3041 buffer_id: usize,
3042 buffer: BufferSnapshot,
3043 range: ExcerptRange<text::Anchor>,
3044 has_trailing_newline: bool,
3045 ) -> Self {
3046 Excerpt {
3047 id,
3048 locator,
3049 max_buffer_row: range.context.end.to_point(&buffer).row,
3050 text_summary: buffer
3051 .text_summary_for_range::<TextSummary, _>(range.context.to_offset(&buffer)),
3052 buffer_id,
3053 buffer,
3054 range,
3055 has_trailing_newline,
3056 }
3057 }
3058
3059 fn chunks_in_range(&self, range: Range<usize>, language_aware: bool) -> ExcerptChunks {
3060 let content_start = self.range.context.start.to_offset(&self.buffer);
3061 let chunks_start = content_start + range.start;
3062 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
3063
3064 let footer_height = if self.has_trailing_newline
3065 && range.start <= self.text_summary.len
3066 && range.end > self.text_summary.len
3067 {
3068 1
3069 } else {
3070 0
3071 };
3072
3073 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
3074
3075 ExcerptChunks {
3076 content_chunks,
3077 footer_height,
3078 }
3079 }
3080
3081 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
3082 let content_start = self.range.context.start.to_offset(&self.buffer);
3083 let bytes_start = content_start + range.start;
3084 let bytes_end = content_start + cmp::min(range.end, self.text_summary.len);
3085 let footer_height = if self.has_trailing_newline
3086 && range.start <= self.text_summary.len
3087 && range.end > self.text_summary.len
3088 {
3089 1
3090 } else {
3091 0
3092 };
3093 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
3094
3095 ExcerptBytes {
3096 content_bytes,
3097 footer_height,
3098 }
3099 }
3100
3101 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
3102 if text_anchor
3103 .cmp(&self.range.context.start, &self.buffer)
3104 .is_lt()
3105 {
3106 self.range.context.start
3107 } else if text_anchor
3108 .cmp(&self.range.context.end, &self.buffer)
3109 .is_gt()
3110 {
3111 self.range.context.end
3112 } else {
3113 text_anchor
3114 }
3115 }
3116
3117 fn contains(&self, anchor: &Anchor) -> bool {
3118 Some(self.buffer_id) == anchor.buffer_id
3119 && self
3120 .range
3121 .context
3122 .start
3123 .cmp(&anchor.text_anchor, &self.buffer)
3124 .is_le()
3125 && self
3126 .range
3127 .context
3128 .end
3129 .cmp(&anchor.text_anchor, &self.buffer)
3130 .is_ge()
3131 }
3132}
3133
3134impl ExcerptId {
3135 pub fn min() -> Self {
3136 Self(0)
3137 }
3138
3139 pub fn max() -> Self {
3140 Self(usize::MAX)
3141 }
3142
3143 pub fn cmp(&self, other: &Self, snapshot: &MultiBufferSnapshot) -> cmp::Ordering {
3144 let a = snapshot.excerpt_locator_for_id(*self);
3145 let b = snapshot.excerpt_locator_for_id(*other);
3146 a.cmp(&b).then_with(|| self.0.cmp(&other.0))
3147 }
3148}
3149
3150impl Into<usize> for ExcerptId {
3151 fn into(self) -> usize {
3152 self.0
3153 }
3154}
3155
3156impl fmt::Debug for Excerpt {
3157 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
3158 f.debug_struct("Excerpt")
3159 .field("id", &self.id)
3160 .field("locator", &self.locator)
3161 .field("buffer_id", &self.buffer_id)
3162 .field("range", &self.range)
3163 .field("text_summary", &self.text_summary)
3164 .field("has_trailing_newline", &self.has_trailing_newline)
3165 .finish()
3166 }
3167}
3168
3169impl sum_tree::Item for Excerpt {
3170 type Summary = ExcerptSummary;
3171
3172 fn summary(&self) -> Self::Summary {
3173 let mut text = self.text_summary.clone();
3174 if self.has_trailing_newline {
3175 text += TextSummary::from("\n");
3176 }
3177 ExcerptSummary {
3178 excerpt_id: self.id,
3179 excerpt_locator: self.locator.clone(),
3180 max_buffer_row: self.max_buffer_row,
3181 text,
3182 }
3183 }
3184}
3185
3186impl sum_tree::Item for ExcerptIdMapping {
3187 type Summary = ExcerptId;
3188
3189 fn summary(&self) -> Self::Summary {
3190 self.id
3191 }
3192}
3193
3194impl sum_tree::KeyedItem for ExcerptIdMapping {
3195 type Key = ExcerptId;
3196
3197 fn key(&self) -> Self::Key {
3198 self.id
3199 }
3200}
3201
3202impl sum_tree::Summary for ExcerptId {
3203 type Context = ();
3204
3205 fn add_summary(&mut self, other: &Self, _: &()) {
3206 *self = *other;
3207 }
3208}
3209
3210impl sum_tree::Summary for ExcerptSummary {
3211 type Context = ();
3212
3213 fn add_summary(&mut self, summary: &Self, _: &()) {
3214 debug_assert!(summary.excerpt_locator > self.excerpt_locator);
3215 self.excerpt_locator = summary.excerpt_locator.clone();
3216 self.text.add_summary(&summary.text, &());
3217 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
3218 }
3219}
3220
3221impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
3222 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3223 *self += &summary.text;
3224 }
3225}
3226
3227impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
3228 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3229 *self += summary.text.len;
3230 }
3231}
3232
3233impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
3234 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
3235 Ord::cmp(self, &cursor_location.text.len)
3236 }
3237}
3238
3239impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, Option<&'a Locator>> for Locator {
3240 fn cmp(&self, cursor_location: &Option<&'a Locator>, _: &()) -> cmp::Ordering {
3241 Ord::cmp(&Some(self), cursor_location)
3242 }
3243}
3244
3245impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Locator {
3246 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
3247 Ord::cmp(self, &cursor_location.excerpt_locator)
3248 }
3249}
3250
3251impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for OffsetUtf16 {
3252 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3253 *self += summary.text.len_utf16;
3254 }
3255}
3256
3257impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
3258 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3259 *self += summary.text.lines;
3260 }
3261}
3262
3263impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
3264 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3265 *self += summary.text.lines_utf16()
3266 }
3267}
3268
3269impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a Locator> {
3270 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3271 *self = Some(&summary.excerpt_locator);
3272 }
3273}
3274
3275impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<ExcerptId> {
3276 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3277 *self = Some(summary.excerpt_id);
3278 }
3279}
3280
3281impl<'a> MultiBufferRows<'a> {
3282 pub fn seek(&mut self, row: u32) {
3283 self.buffer_row_range = 0..0;
3284
3285 self.excerpts
3286 .seek_forward(&Point::new(row, 0), Bias::Right, &());
3287 if self.excerpts.item().is_none() {
3288 self.excerpts.prev(&());
3289
3290 if self.excerpts.item().is_none() && row == 0 {
3291 self.buffer_row_range = 0..1;
3292 return;
3293 }
3294 }
3295
3296 if let Some(excerpt) = self.excerpts.item() {
3297 let overshoot = row - self.excerpts.start().row;
3298 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer).row;
3299 self.buffer_row_range.start = excerpt_start + overshoot;
3300 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
3301 }
3302 }
3303}
3304
3305impl<'a> Iterator for MultiBufferRows<'a> {
3306 type Item = Option<u32>;
3307
3308 fn next(&mut self) -> Option<Self::Item> {
3309 loop {
3310 if !self.buffer_row_range.is_empty() {
3311 let row = Some(self.buffer_row_range.start);
3312 self.buffer_row_range.start += 1;
3313 return Some(row);
3314 }
3315 self.excerpts.item()?;
3316 self.excerpts.next(&());
3317 let excerpt = self.excerpts.item()?;
3318 self.buffer_row_range.start = excerpt.range.context.start.to_point(&excerpt.buffer).row;
3319 self.buffer_row_range.end =
3320 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
3321 }
3322 }
3323}
3324
3325impl<'a> MultiBufferChunks<'a> {
3326 pub fn offset(&self) -> usize {
3327 self.range.start
3328 }
3329
3330 pub fn seek(&mut self, offset: usize) {
3331 self.range.start = offset;
3332 self.excerpts.seek(&offset, Bias::Right, &());
3333 if let Some(excerpt) = self.excerpts.item() {
3334 self.excerpt_chunks = Some(excerpt.chunks_in_range(
3335 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
3336 self.language_aware,
3337 ));
3338 } else {
3339 self.excerpt_chunks = None;
3340 }
3341 }
3342}
3343
3344impl<'a> Iterator for MultiBufferChunks<'a> {
3345 type Item = Chunk<'a>;
3346
3347 fn next(&mut self) -> Option<Self::Item> {
3348 if self.range.is_empty() {
3349 None
3350 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
3351 self.range.start += chunk.text.len();
3352 Some(chunk)
3353 } else {
3354 self.excerpts.next(&());
3355 let excerpt = self.excerpts.item()?;
3356 self.excerpt_chunks = Some(excerpt.chunks_in_range(
3357 0..self.range.end - self.excerpts.start(),
3358 self.language_aware,
3359 ));
3360 self.next()
3361 }
3362 }
3363}
3364
3365impl<'a> MultiBufferBytes<'a> {
3366 fn consume(&mut self, len: usize) {
3367 self.range.start += len;
3368 self.chunk = &self.chunk[len..];
3369
3370 if !self.range.is_empty() && self.chunk.is_empty() {
3371 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
3372 self.chunk = chunk;
3373 } else {
3374 self.excerpts.next(&());
3375 if let Some(excerpt) = self.excerpts.item() {
3376 let mut excerpt_bytes =
3377 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
3378 self.chunk = excerpt_bytes.next().unwrap();
3379 self.excerpt_bytes = Some(excerpt_bytes);
3380 }
3381 }
3382 }
3383 }
3384}
3385
3386impl<'a> Iterator for MultiBufferBytes<'a> {
3387 type Item = &'a [u8];
3388
3389 fn next(&mut self) -> Option<Self::Item> {
3390 let chunk = self.chunk;
3391 if chunk.is_empty() {
3392 None
3393 } else {
3394 self.consume(chunk.len());
3395 Some(chunk)
3396 }
3397 }
3398}
3399
3400impl<'a> io::Read for MultiBufferBytes<'a> {
3401 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
3402 let len = cmp::min(buf.len(), self.chunk.len());
3403 buf[..len].copy_from_slice(&self.chunk[..len]);
3404 if len > 0 {
3405 self.consume(len);
3406 }
3407 Ok(len)
3408 }
3409}
3410
3411impl<'a> Iterator for ExcerptBytes<'a> {
3412 type Item = &'a [u8];
3413
3414 fn next(&mut self) -> Option<Self::Item> {
3415 if let Some(chunk) = self.content_bytes.next() {
3416 if !chunk.is_empty() {
3417 return Some(chunk);
3418 }
3419 }
3420
3421 if self.footer_height > 0 {
3422 let result = &NEWLINES[..self.footer_height];
3423 self.footer_height = 0;
3424 return Some(result);
3425 }
3426
3427 None
3428 }
3429}
3430
3431impl<'a> Iterator for ExcerptChunks<'a> {
3432 type Item = Chunk<'a>;
3433
3434 fn next(&mut self) -> Option<Self::Item> {
3435 if let Some(chunk) = self.content_chunks.next() {
3436 return Some(chunk);
3437 }
3438
3439 if self.footer_height > 0 {
3440 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
3441 self.footer_height = 0;
3442 return Some(Chunk {
3443 text,
3444 ..Default::default()
3445 });
3446 }
3447
3448 None
3449 }
3450}
3451
3452impl ToOffset for Point {
3453 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3454 snapshot.point_to_offset(*self)
3455 }
3456}
3457
3458impl ToOffset for usize {
3459 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3460 assert!(*self <= snapshot.len(), "offset is out of range");
3461 *self
3462 }
3463}
3464
3465impl ToOffset for OffsetUtf16 {
3466 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3467 snapshot.offset_utf16_to_offset(*self)
3468 }
3469}
3470
3471impl ToOffset for PointUtf16 {
3472 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3473 snapshot.point_utf16_to_offset(*self)
3474 }
3475}
3476
3477impl ToOffsetUtf16 for OffsetUtf16 {
3478 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
3479 *self
3480 }
3481}
3482
3483impl ToOffsetUtf16 for usize {
3484 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
3485 snapshot.offset_to_offset_utf16(*self)
3486 }
3487}
3488
3489impl ToPoint for usize {
3490 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
3491 snapshot.offset_to_point(*self)
3492 }
3493}
3494
3495impl ToPoint for Point {
3496 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
3497 *self
3498 }
3499}
3500
3501impl ToPointUtf16 for usize {
3502 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
3503 snapshot.offset_to_point_utf16(*self)
3504 }
3505}
3506
3507impl ToPointUtf16 for Point {
3508 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
3509 snapshot.point_to_point_utf16(*self)
3510 }
3511}
3512
3513impl ToPointUtf16 for PointUtf16 {
3514 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
3515 *self
3516 }
3517}
3518
3519#[cfg(test)]
3520mod tests {
3521 use super::*;
3522 use gpui::MutableAppContext;
3523 use language::{Buffer, Rope};
3524 use rand::prelude::*;
3525 use settings::Settings;
3526 use std::{env, rc::Rc};
3527
3528 use util::test::sample_text;
3529
3530 #[gpui::test]
3531 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
3532 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
3533 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
3534
3535 let snapshot = multibuffer.read(cx).snapshot(cx);
3536 assert_eq!(snapshot.text(), buffer.read(cx).text());
3537
3538 assert_eq!(
3539 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3540 (0..buffer.read(cx).row_count())
3541 .map(Some)
3542 .collect::<Vec<_>>()
3543 );
3544
3545 buffer.update(cx, |buffer, cx| buffer.edit([(1..3, "XXX\n")], None, cx));
3546 let snapshot = multibuffer.read(cx).snapshot(cx);
3547
3548 assert_eq!(snapshot.text(), buffer.read(cx).text());
3549 assert_eq!(
3550 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3551 (0..buffer.read(cx).row_count())
3552 .map(Some)
3553 .collect::<Vec<_>>()
3554 );
3555 }
3556
3557 #[gpui::test]
3558 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
3559 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
3560 let guest_buffer = cx.add_model(|cx| {
3561 let state = host_buffer.read(cx).to_proto();
3562 let ops = cx
3563 .background()
3564 .block(host_buffer.read(cx).serialize_ops(cx));
3565 let mut buffer = Buffer::from_proto(1, state, None).unwrap();
3566 buffer
3567 .apply_ops(
3568 ops.into_iter()
3569 .map(|op| language::proto::deserialize_operation(op).unwrap()),
3570 cx,
3571 )
3572 .unwrap();
3573 buffer
3574 });
3575 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
3576 let snapshot = multibuffer.read(cx).snapshot(cx);
3577 assert_eq!(snapshot.text(), "a");
3578
3579 guest_buffer.update(cx, |buffer, cx| buffer.edit([(1..1, "b")], None, cx));
3580 let snapshot = multibuffer.read(cx).snapshot(cx);
3581 assert_eq!(snapshot.text(), "ab");
3582
3583 guest_buffer.update(cx, |buffer, cx| buffer.edit([(2..2, "c")], None, cx));
3584 let snapshot = multibuffer.read(cx).snapshot(cx);
3585 assert_eq!(snapshot.text(), "abc");
3586 }
3587
3588 #[gpui::test]
3589 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
3590 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
3591 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
3592 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3593
3594 let events = Rc::new(RefCell::new(Vec::<Event>::new()));
3595 multibuffer.update(cx, |_, cx| {
3596 let events = events.clone();
3597 cx.subscribe(&multibuffer, move |_, _, event, _| {
3598 events.borrow_mut().push(event.clone())
3599 })
3600 .detach();
3601 });
3602
3603 let subscription = multibuffer.update(cx, |multibuffer, cx| {
3604 let subscription = multibuffer.subscribe();
3605 multibuffer.push_excerpts(
3606 buffer_1.clone(),
3607 [ExcerptRange {
3608 context: Point::new(1, 2)..Point::new(2, 5),
3609 primary: None,
3610 }],
3611 cx,
3612 );
3613 assert_eq!(
3614 subscription.consume().into_inner(),
3615 [Edit {
3616 old: 0..0,
3617 new: 0..10
3618 }]
3619 );
3620
3621 multibuffer.push_excerpts(
3622 buffer_1.clone(),
3623 [ExcerptRange {
3624 context: Point::new(3, 3)..Point::new(4, 4),
3625 primary: None,
3626 }],
3627 cx,
3628 );
3629 multibuffer.push_excerpts(
3630 buffer_2.clone(),
3631 [ExcerptRange {
3632 context: Point::new(3, 1)..Point::new(3, 3),
3633 primary: None,
3634 }],
3635 cx,
3636 );
3637 assert_eq!(
3638 subscription.consume().into_inner(),
3639 [Edit {
3640 old: 10..10,
3641 new: 10..22
3642 }]
3643 );
3644
3645 subscription
3646 });
3647
3648 // Adding excerpts emits an edited event.
3649 assert_eq!(
3650 events.borrow().as_slice(),
3651 &[Event::Edited, Event::Edited, Event::Edited]
3652 );
3653
3654 let snapshot = multibuffer.read(cx).snapshot(cx);
3655 assert_eq!(
3656 snapshot.text(),
3657 concat!(
3658 "bbbb\n", // Preserve newlines
3659 "ccccc\n", //
3660 "ddd\n", //
3661 "eeee\n", //
3662 "jj" //
3663 )
3664 );
3665 assert_eq!(
3666 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3667 [Some(1), Some(2), Some(3), Some(4), Some(3)]
3668 );
3669 assert_eq!(
3670 snapshot.buffer_rows(2).collect::<Vec<_>>(),
3671 [Some(3), Some(4), Some(3)]
3672 );
3673 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
3674 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
3675
3676 assert_eq!(
3677 boundaries_in_range(Point::new(0, 0)..Point::new(4, 2), &snapshot),
3678 &[
3679 (0, "bbbb\nccccc".to_string(), true),
3680 (2, "ddd\neeee".to_string(), false),
3681 (4, "jj".to_string(), true),
3682 ]
3683 );
3684 assert_eq!(
3685 boundaries_in_range(Point::new(0, 0)..Point::new(2, 0), &snapshot),
3686 &[(0, "bbbb\nccccc".to_string(), true)]
3687 );
3688 assert_eq!(
3689 boundaries_in_range(Point::new(1, 0)..Point::new(1, 5), &snapshot),
3690 &[]
3691 );
3692 assert_eq!(
3693 boundaries_in_range(Point::new(1, 0)..Point::new(2, 0), &snapshot),
3694 &[]
3695 );
3696 assert_eq!(
3697 boundaries_in_range(Point::new(1, 0)..Point::new(4, 0), &snapshot),
3698 &[(2, "ddd\neeee".to_string(), false)]
3699 );
3700 assert_eq!(
3701 boundaries_in_range(Point::new(1, 0)..Point::new(4, 0), &snapshot),
3702 &[(2, "ddd\neeee".to_string(), false)]
3703 );
3704 assert_eq!(
3705 boundaries_in_range(Point::new(2, 0)..Point::new(3, 0), &snapshot),
3706 &[(2, "ddd\neeee".to_string(), false)]
3707 );
3708 assert_eq!(
3709 boundaries_in_range(Point::new(4, 0)..Point::new(4, 2), &snapshot),
3710 &[(4, "jj".to_string(), true)]
3711 );
3712 assert_eq!(
3713 boundaries_in_range(Point::new(4, 2)..Point::new(4, 2), &snapshot),
3714 &[]
3715 );
3716
3717 buffer_1.update(cx, |buffer, cx| {
3718 let text = "\n";
3719 buffer.edit(
3720 [
3721 (Point::new(0, 0)..Point::new(0, 0), text),
3722 (Point::new(2, 1)..Point::new(2, 3), text),
3723 ],
3724 None,
3725 cx,
3726 );
3727 });
3728
3729 let snapshot = multibuffer.read(cx).snapshot(cx);
3730 assert_eq!(
3731 snapshot.text(),
3732 concat!(
3733 "bbbb\n", // Preserve newlines
3734 "c\n", //
3735 "cc\n", //
3736 "ddd\n", //
3737 "eeee\n", //
3738 "jj" //
3739 )
3740 );
3741
3742 assert_eq!(
3743 subscription.consume().into_inner(),
3744 [Edit {
3745 old: 6..8,
3746 new: 6..7
3747 }]
3748 );
3749
3750 let snapshot = multibuffer.read(cx).snapshot(cx);
3751 assert_eq!(
3752 snapshot.clip_point(Point::new(0, 5), Bias::Left),
3753 Point::new(0, 4)
3754 );
3755 assert_eq!(
3756 snapshot.clip_point(Point::new(0, 5), Bias::Right),
3757 Point::new(0, 4)
3758 );
3759 assert_eq!(
3760 snapshot.clip_point(Point::new(5, 1), Bias::Right),
3761 Point::new(5, 1)
3762 );
3763 assert_eq!(
3764 snapshot.clip_point(Point::new(5, 2), Bias::Right),
3765 Point::new(5, 2)
3766 );
3767 assert_eq!(
3768 snapshot.clip_point(Point::new(5, 3), Bias::Right),
3769 Point::new(5, 2)
3770 );
3771
3772 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
3773 let (buffer_2_excerpt_id, _) =
3774 multibuffer.excerpts_for_buffer(&buffer_2, cx)[0].clone();
3775 multibuffer.remove_excerpts([buffer_2_excerpt_id], cx);
3776 multibuffer.snapshot(cx)
3777 });
3778
3779 assert_eq!(
3780 snapshot.text(),
3781 concat!(
3782 "bbbb\n", // Preserve newlines
3783 "c\n", //
3784 "cc\n", //
3785 "ddd\n", //
3786 "eeee", //
3787 )
3788 );
3789
3790 fn boundaries_in_range(
3791 range: Range<Point>,
3792 snapshot: &MultiBufferSnapshot,
3793 ) -> Vec<(u32, String, bool)> {
3794 snapshot
3795 .excerpt_boundaries_in_range(range)
3796 .map(|boundary| {
3797 (
3798 boundary.row,
3799 boundary
3800 .buffer
3801 .text_for_range(boundary.range.context)
3802 .collect::<String>(),
3803 boundary.starts_new_buffer,
3804 )
3805 })
3806 .collect::<Vec<_>>()
3807 }
3808 }
3809
3810 #[gpui::test]
3811 fn test_excerpts_with_context_lines(cx: &mut MutableAppContext) {
3812 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(20, 3, 'a'), cx));
3813 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3814 let anchor_ranges = multibuffer.update(cx, |multibuffer, cx| {
3815 multibuffer.push_excerpts_with_context_lines(
3816 buffer.clone(),
3817 vec![
3818 Point::new(3, 2)..Point::new(4, 2),
3819 Point::new(7, 1)..Point::new(7, 3),
3820 Point::new(15, 0)..Point::new(15, 0),
3821 ],
3822 2,
3823 cx,
3824 )
3825 });
3826
3827 let snapshot = multibuffer.read(cx).snapshot(cx);
3828 assert_eq!(
3829 snapshot.text(),
3830 "bbb\nccc\nddd\neee\nfff\nggg\nhhh\niii\njjj\n\nnnn\nooo\nppp\nqqq\nrrr\n"
3831 );
3832
3833 assert_eq!(
3834 anchor_ranges
3835 .iter()
3836 .map(|range| range.to_point(&snapshot))
3837 .collect::<Vec<_>>(),
3838 vec![
3839 Point::new(2, 2)..Point::new(3, 2),
3840 Point::new(6, 1)..Point::new(6, 3),
3841 Point::new(12, 0)..Point::new(12, 0)
3842 ]
3843 );
3844 }
3845
3846 #[gpui::test]
3847 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
3848 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3849
3850 let snapshot = multibuffer.read(cx).snapshot(cx);
3851 assert_eq!(snapshot.text(), "");
3852 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
3853 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
3854 }
3855
3856 #[gpui::test]
3857 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
3858 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
3859 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
3860 let old_snapshot = multibuffer.read(cx).snapshot(cx);
3861 buffer.update(cx, |buffer, cx| {
3862 buffer.edit([(0..0, "X")], None, cx);
3863 buffer.edit([(5..5, "Y")], None, cx);
3864 });
3865 let new_snapshot = multibuffer.read(cx).snapshot(cx);
3866
3867 assert_eq!(old_snapshot.text(), "abcd");
3868 assert_eq!(new_snapshot.text(), "XabcdY");
3869
3870 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
3871 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
3872 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
3873 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
3874 }
3875
3876 #[gpui::test]
3877 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
3878 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
3879 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
3880 let multibuffer = cx.add_model(|cx| {
3881 let mut multibuffer = MultiBuffer::new(0);
3882 multibuffer.push_excerpts(
3883 buffer_1.clone(),
3884 [ExcerptRange {
3885 context: 0..4,
3886 primary: None,
3887 }],
3888 cx,
3889 );
3890 multibuffer.push_excerpts(
3891 buffer_2.clone(),
3892 [ExcerptRange {
3893 context: 0..5,
3894 primary: None,
3895 }],
3896 cx,
3897 );
3898 multibuffer
3899 });
3900 let old_snapshot = multibuffer.read(cx).snapshot(cx);
3901
3902 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
3903 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
3904 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
3905 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
3906 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
3907 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
3908
3909 buffer_1.update(cx, |buffer, cx| {
3910 buffer.edit([(0..0, "W")], None, cx);
3911 buffer.edit([(5..5, "X")], None, cx);
3912 });
3913 buffer_2.update(cx, |buffer, cx| {
3914 buffer.edit([(0..0, "Y")], None, cx);
3915 buffer.edit([(6..6, "Z")], None, cx);
3916 });
3917 let new_snapshot = multibuffer.read(cx).snapshot(cx);
3918
3919 assert_eq!(old_snapshot.text(), "abcd\nefghi");
3920 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
3921
3922 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
3923 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
3924 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
3925 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
3926 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
3927 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
3928 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
3929 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
3930 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
3931 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
3932 }
3933
3934 #[gpui::test]
3935 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
3936 cx: &mut MutableAppContext,
3937 ) {
3938 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
3939 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
3940 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3941
3942 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
3943 // Add an excerpt from buffer 1 that spans this new insertion.
3944 buffer_1.update(cx, |buffer, cx| buffer.edit([(4..4, "123")], None, cx));
3945 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
3946 multibuffer
3947 .push_excerpts(
3948 buffer_1.clone(),
3949 [ExcerptRange {
3950 context: 0..7,
3951 primary: None,
3952 }],
3953 cx,
3954 )
3955 .pop()
3956 .unwrap()
3957 });
3958
3959 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
3960 assert_eq!(snapshot_1.text(), "abcd123");
3961
3962 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
3963 let (excerpt_id_2, excerpt_id_3) = multibuffer.update(cx, |multibuffer, cx| {
3964 multibuffer.remove_excerpts([excerpt_id_1], cx);
3965 let mut ids = multibuffer
3966 .push_excerpts(
3967 buffer_2.clone(),
3968 [
3969 ExcerptRange {
3970 context: 0..4,
3971 primary: None,
3972 },
3973 ExcerptRange {
3974 context: 6..10,
3975 primary: None,
3976 },
3977 ExcerptRange {
3978 context: 12..16,
3979 primary: None,
3980 },
3981 ],
3982 cx,
3983 )
3984 .into_iter();
3985 (ids.next().unwrap(), ids.next().unwrap())
3986 });
3987 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
3988 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
3989
3990 // The old excerpt id doesn't get reused.
3991 assert_ne!(excerpt_id_2, excerpt_id_1);
3992
3993 // Resolve some anchors from the previous snapshot in the new snapshot.
3994 // The current excerpts are from a different buffer, so we don't attempt to
3995 // resolve the old text anchor in the new buffer.
3996 assert_eq!(
3997 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
3998 0
3999 );
4000 assert_eq!(
4001 snapshot_2.summaries_for_anchors::<usize, _>(&[
4002 snapshot_1.anchor_before(2),
4003 snapshot_1.anchor_after(3)
4004 ]),
4005 vec![0, 0]
4006 );
4007
4008 // Refresh anchors from the old snapshot. The return value indicates that both
4009 // anchors lost their original excerpt.
4010 let refresh =
4011 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
4012 assert_eq!(
4013 refresh,
4014 &[
4015 (0, snapshot_2.anchor_before(0), false),
4016 (1, snapshot_2.anchor_after(0), false),
4017 ]
4018 );
4019
4020 // Replace the middle excerpt with a smaller excerpt in buffer 2,
4021 // that intersects the old excerpt.
4022 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
4023 multibuffer.remove_excerpts([excerpt_id_3], cx);
4024 multibuffer
4025 .insert_excerpts_after(
4026 excerpt_id_2,
4027 buffer_2.clone(),
4028 [ExcerptRange {
4029 context: 5..8,
4030 primary: None,
4031 }],
4032 cx,
4033 )
4034 .pop()
4035 .unwrap()
4036 });
4037
4038 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
4039 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
4040 assert_ne!(excerpt_id_5, excerpt_id_3);
4041
4042 // Resolve some anchors from the previous snapshot in the new snapshot.
4043 // The third anchor can't be resolved, since its excerpt has been removed,
4044 // so it resolves to the same position as its predecessor.
4045 let anchors = [
4046 snapshot_2.anchor_before(0),
4047 snapshot_2.anchor_after(2),
4048 snapshot_2.anchor_after(6),
4049 snapshot_2.anchor_after(14),
4050 ];
4051 assert_eq!(
4052 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
4053 &[0, 2, 9, 13]
4054 );
4055
4056 let new_anchors = snapshot_3.refresh_anchors(&anchors);
4057 assert_eq!(
4058 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
4059 &[(0, true), (1, true), (2, true), (3, true)]
4060 );
4061 assert_eq!(
4062 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
4063 &[0, 2, 7, 13]
4064 );
4065 }
4066
4067 #[gpui::test(iterations = 100)]
4068 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
4069 let operations = env::var("OPERATIONS")
4070 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
4071 .unwrap_or(10);
4072
4073 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
4074 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4075 let mut excerpt_ids = Vec::<ExcerptId>::new();
4076 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
4077 let mut anchors = Vec::new();
4078 let mut old_versions = Vec::new();
4079
4080 for _ in 0..operations {
4081 match rng.gen_range(0..100) {
4082 0..=19 if !buffers.is_empty() => {
4083 let buffer = buffers.choose(&mut rng).unwrap();
4084 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
4085 }
4086 20..=29 if !expected_excerpts.is_empty() => {
4087 let mut ids_to_remove = vec![];
4088 for _ in 0..rng.gen_range(1..=3) {
4089 if expected_excerpts.is_empty() {
4090 break;
4091 }
4092
4093 let ix = rng.gen_range(0..expected_excerpts.len());
4094 ids_to_remove.push(excerpt_ids.remove(ix));
4095 let (buffer, range) = expected_excerpts.remove(ix);
4096 let buffer = buffer.read(cx);
4097 log::info!(
4098 "Removing excerpt {}: {:?}",
4099 ix,
4100 buffer
4101 .text_for_range(range.to_offset(buffer))
4102 .collect::<String>(),
4103 );
4104 }
4105 let snapshot = multibuffer.read(cx).read(cx);
4106 ids_to_remove.sort_unstable_by(|a, b| a.cmp(&b, &snapshot));
4107 drop(snapshot);
4108 multibuffer.update(cx, |multibuffer, cx| {
4109 multibuffer.remove_excerpts(ids_to_remove, cx)
4110 });
4111 }
4112 30..=39 if !expected_excerpts.is_empty() => {
4113 let multibuffer = multibuffer.read(cx).read(cx);
4114 let offset =
4115 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
4116 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
4117 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
4118 anchors.push(multibuffer.anchor_at(offset, bias));
4119 anchors.sort_by(|a, b| a.cmp(b, &multibuffer));
4120 }
4121 40..=44 if !anchors.is_empty() => {
4122 let multibuffer = multibuffer.read(cx).read(cx);
4123 let prev_len = anchors.len();
4124 anchors = multibuffer
4125 .refresh_anchors(&anchors)
4126 .into_iter()
4127 .map(|a| a.1)
4128 .collect();
4129
4130 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
4131 // overshoot its boundaries.
4132 assert_eq!(anchors.len(), prev_len);
4133 for anchor in &anchors {
4134 if anchor.excerpt_id == ExcerptId::min()
4135 || anchor.excerpt_id == ExcerptId::max()
4136 {
4137 continue;
4138 }
4139
4140 let excerpt = multibuffer.excerpt(anchor.excerpt_id).unwrap();
4141 assert_eq!(excerpt.id, anchor.excerpt_id);
4142 assert!(excerpt.contains(anchor));
4143 }
4144 }
4145 _ => {
4146 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
4147 let base_text = util::RandomCharIter::new(&mut rng)
4148 .take(10)
4149 .collect::<String>();
4150 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
4151 buffers.last().unwrap()
4152 } else {
4153 buffers.choose(&mut rng).unwrap()
4154 };
4155
4156 let buffer = buffer_handle.read(cx);
4157 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
4158 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
4159 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
4160 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
4161 let prev_excerpt_id = excerpt_ids
4162 .get(prev_excerpt_ix)
4163 .cloned()
4164 .unwrap_or_else(ExcerptId::max);
4165 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
4166
4167 log::info!(
4168 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
4169 excerpt_ix,
4170 expected_excerpts.len(),
4171 buffer_handle.id(),
4172 buffer.text(),
4173 start_ix..end_ix,
4174 &buffer.text()[start_ix..end_ix]
4175 );
4176
4177 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
4178 multibuffer
4179 .insert_excerpts_after(
4180 prev_excerpt_id,
4181 buffer_handle.clone(),
4182 [ExcerptRange {
4183 context: start_ix..end_ix,
4184 primary: None,
4185 }],
4186 cx,
4187 )
4188 .pop()
4189 .unwrap()
4190 });
4191
4192 excerpt_ids.insert(excerpt_ix, excerpt_id);
4193 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
4194 }
4195 }
4196
4197 if rng.gen_bool(0.3) {
4198 multibuffer.update(cx, |multibuffer, cx| {
4199 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
4200 })
4201 }
4202
4203 let snapshot = multibuffer.read(cx).snapshot(cx);
4204
4205 let mut excerpt_starts = Vec::new();
4206 let mut expected_text = String::new();
4207 let mut expected_buffer_rows = Vec::new();
4208 for (buffer, range) in &expected_excerpts {
4209 let buffer = buffer.read(cx);
4210 let buffer_range = range.to_offset(buffer);
4211
4212 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
4213 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
4214 expected_text.push('\n');
4215
4216 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
4217 ..=buffer.offset_to_point(buffer_range.end).row;
4218 for row in buffer_row_range {
4219 expected_buffer_rows.push(Some(row));
4220 }
4221 }
4222 // Remove final trailing newline.
4223 if !expected_excerpts.is_empty() {
4224 expected_text.pop();
4225 }
4226
4227 // Always report one buffer row
4228 if expected_buffer_rows.is_empty() {
4229 expected_buffer_rows.push(Some(0));
4230 }
4231
4232 assert_eq!(snapshot.text(), expected_text);
4233 log::info!("MultiBuffer text: {:?}", expected_text);
4234
4235 assert_eq!(
4236 snapshot.buffer_rows(0).collect::<Vec<_>>(),
4237 expected_buffer_rows,
4238 );
4239
4240 for _ in 0..5 {
4241 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
4242 assert_eq!(
4243 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
4244 &expected_buffer_rows[start_row..],
4245 "buffer_rows({})",
4246 start_row
4247 );
4248 }
4249
4250 assert_eq!(
4251 snapshot.max_buffer_row(),
4252 expected_buffer_rows.into_iter().flatten().max().unwrap()
4253 );
4254
4255 let mut excerpt_starts = excerpt_starts.into_iter();
4256 for (buffer, range) in &expected_excerpts {
4257 let buffer_id = buffer.id();
4258 let buffer = buffer.read(cx);
4259 let buffer_range = range.to_offset(buffer);
4260 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
4261 let buffer_start_point_utf16 =
4262 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
4263
4264 let excerpt_start = excerpt_starts.next().unwrap();
4265 let mut offset = excerpt_start.len;
4266 let mut buffer_offset = buffer_range.start;
4267 let mut point = excerpt_start.lines;
4268 let mut buffer_point = buffer_start_point;
4269 let mut point_utf16 = excerpt_start.lines_utf16();
4270 let mut buffer_point_utf16 = buffer_start_point_utf16;
4271 for ch in buffer
4272 .snapshot()
4273 .chunks(buffer_range.clone(), false)
4274 .flat_map(|c| c.text.chars())
4275 {
4276 for _ in 0..ch.len_utf8() {
4277 let left_offset = snapshot.clip_offset(offset, Bias::Left);
4278 let right_offset = snapshot.clip_offset(offset, Bias::Right);
4279 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
4280 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
4281 assert_eq!(
4282 left_offset,
4283 excerpt_start.len + (buffer_left_offset - buffer_range.start),
4284 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
4285 offset,
4286 buffer_id,
4287 buffer_offset,
4288 );
4289 assert_eq!(
4290 right_offset,
4291 excerpt_start.len + (buffer_right_offset - buffer_range.start),
4292 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
4293 offset,
4294 buffer_id,
4295 buffer_offset,
4296 );
4297
4298 let left_point = snapshot.clip_point(point, Bias::Left);
4299 let right_point = snapshot.clip_point(point, Bias::Right);
4300 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
4301 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
4302 assert_eq!(
4303 left_point,
4304 excerpt_start.lines + (buffer_left_point - buffer_start_point),
4305 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
4306 point,
4307 buffer_id,
4308 buffer_point,
4309 );
4310 assert_eq!(
4311 right_point,
4312 excerpt_start.lines + (buffer_right_point - buffer_start_point),
4313 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
4314 point,
4315 buffer_id,
4316 buffer_point,
4317 );
4318
4319 assert_eq!(
4320 snapshot.point_to_offset(left_point),
4321 left_offset,
4322 "point_to_offset({:?})",
4323 left_point,
4324 );
4325 assert_eq!(
4326 snapshot.offset_to_point(left_offset),
4327 left_point,
4328 "offset_to_point({:?})",
4329 left_offset,
4330 );
4331
4332 offset += 1;
4333 buffer_offset += 1;
4334 if ch == '\n' {
4335 point += Point::new(1, 0);
4336 buffer_point += Point::new(1, 0);
4337 } else {
4338 point += Point::new(0, 1);
4339 buffer_point += Point::new(0, 1);
4340 }
4341 }
4342
4343 for _ in 0..ch.len_utf16() {
4344 let left_point_utf16 =
4345 snapshot.clip_point_utf16(Unclipped(point_utf16), Bias::Left);
4346 let right_point_utf16 =
4347 snapshot.clip_point_utf16(Unclipped(point_utf16), Bias::Right);
4348 let buffer_left_point_utf16 =
4349 buffer.clip_point_utf16(Unclipped(buffer_point_utf16), Bias::Left);
4350 let buffer_right_point_utf16 =
4351 buffer.clip_point_utf16(Unclipped(buffer_point_utf16), Bias::Right);
4352 assert_eq!(
4353 left_point_utf16,
4354 excerpt_start.lines_utf16()
4355 + (buffer_left_point_utf16 - buffer_start_point_utf16),
4356 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
4357 point_utf16,
4358 buffer_id,
4359 buffer_point_utf16,
4360 );
4361 assert_eq!(
4362 right_point_utf16,
4363 excerpt_start.lines_utf16()
4364 + (buffer_right_point_utf16 - buffer_start_point_utf16),
4365 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
4366 point_utf16,
4367 buffer_id,
4368 buffer_point_utf16,
4369 );
4370
4371 if ch == '\n' {
4372 point_utf16 += PointUtf16::new(1, 0);
4373 buffer_point_utf16 += PointUtf16::new(1, 0);
4374 } else {
4375 point_utf16 += PointUtf16::new(0, 1);
4376 buffer_point_utf16 += PointUtf16::new(0, 1);
4377 }
4378 }
4379 }
4380 }
4381
4382 for (row, line) in expected_text.split('\n').enumerate() {
4383 assert_eq!(
4384 snapshot.line_len(row as u32),
4385 line.len() as u32,
4386 "line_len({}).",
4387 row
4388 );
4389 }
4390
4391 let text_rope = Rope::from(expected_text.as_str());
4392 for _ in 0..10 {
4393 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
4394 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
4395
4396 let text_for_range = snapshot
4397 .text_for_range(start_ix..end_ix)
4398 .collect::<String>();
4399 assert_eq!(
4400 text_for_range,
4401 &expected_text[start_ix..end_ix],
4402 "incorrect text for range {:?}",
4403 start_ix..end_ix
4404 );
4405
4406 let excerpted_buffer_ranges = multibuffer
4407 .read(cx)
4408 .range_to_buffer_ranges(start_ix..end_ix, cx);
4409 let excerpted_buffers_text = excerpted_buffer_ranges
4410 .into_iter()
4411 .map(|(buffer, buffer_range)| {
4412 buffer
4413 .read(cx)
4414 .text_for_range(buffer_range)
4415 .collect::<String>()
4416 })
4417 .collect::<Vec<_>>()
4418 .join("\n");
4419 assert_eq!(excerpted_buffers_text, text_for_range);
4420
4421 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
4422 assert_eq!(
4423 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
4424 expected_summary,
4425 "incorrect summary for range {:?}",
4426 start_ix..end_ix
4427 );
4428 }
4429
4430 // Anchor resolution
4431 let summaries = snapshot.summaries_for_anchors::<usize, _>(&anchors);
4432 assert_eq!(anchors.len(), summaries.len());
4433 for (anchor, resolved_offset) in anchors.iter().zip(summaries) {
4434 assert!(resolved_offset <= snapshot.len());
4435 assert_eq!(
4436 snapshot.summary_for_anchor::<usize>(anchor),
4437 resolved_offset
4438 );
4439 }
4440
4441 for _ in 0..10 {
4442 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
4443 assert_eq!(
4444 snapshot.reversed_chars_at(end_ix).collect::<String>(),
4445 expected_text[..end_ix].chars().rev().collect::<String>(),
4446 );
4447 }
4448
4449 for _ in 0..10 {
4450 let end_ix = rng.gen_range(0..=text_rope.len());
4451 let start_ix = rng.gen_range(0..=end_ix);
4452 assert_eq!(
4453 snapshot
4454 .bytes_in_range(start_ix..end_ix)
4455 .flatten()
4456 .copied()
4457 .collect::<Vec<_>>(),
4458 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
4459 "bytes_in_range({:?})",
4460 start_ix..end_ix,
4461 );
4462 }
4463 }
4464
4465 let snapshot = multibuffer.read(cx).snapshot(cx);
4466 for (old_snapshot, subscription) in old_versions {
4467 let edits = subscription.consume().into_inner();
4468
4469 log::info!(
4470 "applying subscription edits to old text: {:?}: {:?}",
4471 old_snapshot.text(),
4472 edits,
4473 );
4474
4475 let mut text = old_snapshot.text();
4476 for edit in edits {
4477 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
4478 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
4479 }
4480 assert_eq!(text.to_string(), snapshot.text());
4481 }
4482 }
4483
4484 #[gpui::test]
4485 fn test_history(cx: &mut MutableAppContext) {
4486 cx.set_global(Settings::test(cx));
4487 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
4488 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
4489 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4490 let group_interval = multibuffer.read(cx).history.group_interval;
4491 multibuffer.update(cx, |multibuffer, cx| {
4492 multibuffer.push_excerpts(
4493 buffer_1.clone(),
4494 [ExcerptRange {
4495 context: 0..buffer_1.read(cx).len(),
4496 primary: None,
4497 }],
4498 cx,
4499 );
4500 multibuffer.push_excerpts(
4501 buffer_2.clone(),
4502 [ExcerptRange {
4503 context: 0..buffer_2.read(cx).len(),
4504 primary: None,
4505 }],
4506 cx,
4507 );
4508 });
4509
4510 let mut now = Instant::now();
4511
4512 multibuffer.update(cx, |multibuffer, cx| {
4513 let transaction_1 = multibuffer.start_transaction_at(now, cx).unwrap();
4514 multibuffer.edit(
4515 [
4516 (Point::new(0, 0)..Point::new(0, 0), "A"),
4517 (Point::new(1, 0)..Point::new(1, 0), "A"),
4518 ],
4519 None,
4520 cx,
4521 );
4522 multibuffer.edit(
4523 [
4524 (Point::new(0, 1)..Point::new(0, 1), "B"),
4525 (Point::new(1, 1)..Point::new(1, 1), "B"),
4526 ],
4527 None,
4528 cx,
4529 );
4530 multibuffer.end_transaction_at(now, cx);
4531 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
4532
4533 // Edit buffer 1 through the multibuffer
4534 now += 2 * group_interval;
4535 multibuffer.start_transaction_at(now, cx);
4536 multibuffer.edit([(2..2, "C")], None, cx);
4537 multibuffer.end_transaction_at(now, cx);
4538 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
4539
4540 // Edit buffer 1 independently
4541 buffer_1.update(cx, |buffer_1, cx| {
4542 buffer_1.start_transaction_at(now);
4543 buffer_1.edit([(3..3, "D")], None, cx);
4544 buffer_1.end_transaction_at(now, cx);
4545
4546 now += 2 * group_interval;
4547 buffer_1.start_transaction_at(now);
4548 buffer_1.edit([(4..4, "E")], None, cx);
4549 buffer_1.end_transaction_at(now, cx);
4550 });
4551 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\nAB5678");
4552
4553 // An undo in the multibuffer undoes the multibuffer transaction
4554 // and also any individual buffer edits that have occured since
4555 // that transaction.
4556 multibuffer.undo(cx);
4557 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
4558
4559 multibuffer.undo(cx);
4560 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
4561
4562 multibuffer.redo(cx);
4563 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
4564
4565 multibuffer.redo(cx);
4566 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\nAB5678");
4567
4568 // Undo buffer 2 independently.
4569 buffer_2.update(cx, |buffer_2, cx| buffer_2.undo(cx));
4570 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\n5678");
4571
4572 // An undo in the multibuffer undoes the components of the
4573 // the last multibuffer transaction that are not already undone.
4574 multibuffer.undo(cx);
4575 assert_eq!(multibuffer.read(cx).text(), "AB1234\n5678");
4576
4577 multibuffer.undo(cx);
4578 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
4579
4580 multibuffer.redo(cx);
4581 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
4582
4583 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
4584 assert_eq!(multibuffer.read(cx).text(), "ABCD1234\nAB5678");
4585
4586 // Redo stack gets cleared after an edit.
4587 now += 2 * group_interval;
4588 multibuffer.start_transaction_at(now, cx);
4589 multibuffer.edit([(0..0, "X")], None, cx);
4590 multibuffer.end_transaction_at(now, cx);
4591 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
4592 multibuffer.redo(cx);
4593 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
4594 multibuffer.undo(cx);
4595 assert_eq!(multibuffer.read(cx).text(), "ABCD1234\nAB5678");
4596 multibuffer.undo(cx);
4597 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
4598
4599 // Transactions can be grouped manually.
4600 multibuffer.redo(cx);
4601 multibuffer.redo(cx);
4602 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
4603 multibuffer.group_until_transaction(transaction_1, cx);
4604 multibuffer.undo(cx);
4605 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
4606 multibuffer.redo(cx);
4607 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
4608 });
4609 }
4610}