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