1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt};
4use anyhow::Result;
5use clock::ReplicaId;
6use collections::{HashMap, HashSet};
7use gpui::{AppContext, Entity, ModelContext, ModelHandle, Task};
8pub use language::Completion;
9use language::{
10 Buffer, BufferChunks, BufferSnapshot, Chunk, DiagnosticEntry, Event, File, Language, Outline,
11 OutlineItem, Selection, ToOffset as _, ToPoint as _, ToPointUtf16 as _, TransactionId,
12};
13use std::{
14 cell::{Ref, RefCell},
15 cmp, fmt, io,
16 iter::{self, FromIterator},
17 ops::{Range, Sub},
18 str,
19 sync::Arc,
20 time::{Duration, Instant},
21};
22use sum_tree::{Bias, Cursor, SumTree};
23use text::{
24 locator::Locator,
25 rope::TextDimension,
26 subscription::{Subscription, Topic},
27 AnchorRangeExt as _, Edit, Point, PointUtf16, TextSummary,
28};
29use theme::SyntaxTheme;
30use util::post_inc;
31
32const NEWLINES: &'static [u8] = &[b'\n'; u8::MAX as usize];
33
34pub type ExcerptId = Locator;
35
36pub struct MultiBuffer {
37 snapshot: RefCell<MultiBufferSnapshot>,
38 buffers: RefCell<HashMap<usize, BufferState>>,
39 subscriptions: Topic,
40 singleton: bool,
41 replica_id: ReplicaId,
42 history: History,
43}
44
45struct History {
46 next_transaction_id: usize,
47 undo_stack: Vec<Transaction>,
48 redo_stack: Vec<Transaction>,
49 transaction_depth: usize,
50 group_interval: Duration,
51}
52
53#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord, Debug)]
54pub enum CharKind {
55 Newline,
56 Punctuation,
57 Whitespace,
58 Word,
59}
60
61struct Transaction {
62 id: usize,
63 buffer_transactions: HashSet<(usize, text::TransactionId)>,
64 first_edit_at: Instant,
65 last_edit_at: Instant,
66}
67
68pub trait ToOffset: 'static + fmt::Debug {
69 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
70}
71
72pub trait ToPoint: 'static + fmt::Debug {
73 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
74}
75
76pub trait ToPointUtf16: 'static + fmt::Debug {
77 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
78}
79
80struct BufferState {
81 buffer: ModelHandle<Buffer>,
82 last_version: clock::Global,
83 last_parse_count: usize,
84 last_selections_update_count: usize,
85 last_diagnostics_update_count: usize,
86 excerpts: Vec<ExcerptId>,
87 _subscriptions: [gpui::Subscription; 2],
88}
89
90#[derive(Clone, Default)]
91pub struct MultiBufferSnapshot {
92 singleton: bool,
93 excerpts: SumTree<Excerpt>,
94 parse_count: usize,
95 diagnostics_update_count: usize,
96 is_dirty: bool,
97 has_conflict: bool,
98}
99
100pub struct ExcerptProperties<'a, T> {
101 pub buffer: &'a ModelHandle<Buffer>,
102 pub range: Range<T>,
103}
104
105#[derive(Clone)]
106struct Excerpt {
107 id: ExcerptId,
108 buffer_id: usize,
109 buffer: BufferSnapshot,
110 range: Range<text::Anchor>,
111 max_buffer_row: u32,
112 text_summary: TextSummary,
113 has_trailing_newline: bool,
114}
115
116#[derive(Clone, Debug, Default)]
117struct ExcerptSummary {
118 excerpt_id: ExcerptId,
119 max_buffer_row: u32,
120 text: TextSummary,
121}
122
123pub struct MultiBufferRows<'a> {
124 buffer_row_range: Range<u32>,
125 excerpts: Cursor<'a, Excerpt, Point>,
126}
127
128pub struct MultiBufferChunks<'a> {
129 range: Range<usize>,
130 excerpts: Cursor<'a, Excerpt, usize>,
131 excerpt_chunks: Option<ExcerptChunks<'a>>,
132 language_aware: bool,
133}
134
135pub struct MultiBufferBytes<'a> {
136 range: Range<usize>,
137 excerpts: Cursor<'a, Excerpt, usize>,
138 excerpt_bytes: Option<ExcerptBytes<'a>>,
139 chunk: &'a [u8],
140}
141
142struct ExcerptChunks<'a> {
143 content_chunks: BufferChunks<'a>,
144 footer_height: usize,
145}
146
147struct ExcerptBytes<'a> {
148 content_bytes: language::rope::Bytes<'a>,
149 footer_height: usize,
150}
151
152impl MultiBuffer {
153 pub fn new(replica_id: ReplicaId) -> Self {
154 Self {
155 snapshot: Default::default(),
156 buffers: Default::default(),
157 subscriptions: Default::default(),
158 singleton: false,
159 replica_id,
160 history: History {
161 next_transaction_id: Default::default(),
162 undo_stack: Default::default(),
163 redo_stack: Default::default(),
164 transaction_depth: 0,
165 group_interval: Duration::from_millis(300),
166 },
167 }
168 }
169
170 pub fn singleton(buffer: ModelHandle<Buffer>, cx: &mut ModelContext<Self>) -> Self {
171 let mut this = Self::new(buffer.read(cx).replica_id());
172 this.singleton = true;
173 this.push_excerpt(
174 ExcerptProperties {
175 buffer: &buffer,
176 range: text::Anchor::min()..text::Anchor::max(),
177 },
178 cx,
179 );
180 this.snapshot.borrow_mut().singleton = true;
181 this
182 }
183
184 #[cfg(any(test, feature = "test-support"))]
185 pub fn build_simple(text: &str, cx: &mut gpui::MutableAppContext) -> ModelHandle<Self> {
186 let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
187 cx.add_model(|cx| Self::singleton(buffer, cx))
188 }
189
190 #[cfg(any(test, feature = "test-support"))]
191 pub fn build_random(
192 mut rng: &mut impl rand::Rng,
193 cx: &mut gpui::MutableAppContext,
194 ) -> ModelHandle<Self> {
195 use rand::prelude::*;
196 use std::env;
197 use text::RandomCharIter;
198
199 let max_excerpts = env::var("MAX_EXCERPTS")
200 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
201 .unwrap_or(5);
202 let excerpts = rng.gen_range(1..=max_excerpts);
203
204 cx.add_model(|cx| {
205 let mut multibuffer = MultiBuffer::new(0);
206 let mut buffers = Vec::new();
207 for _ in 0..excerpts {
208 let buffer_handle = if rng.gen() || buffers.is_empty() {
209 let text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
210 buffers.push(cx.add_model(|cx| Buffer::new(0, text, cx)));
211 let buffer = buffers.last().unwrap();
212 log::info!(
213 "Creating new buffer {} with text: {:?}",
214 buffer.id(),
215 buffer.read(cx).text()
216 );
217 buffers.last().unwrap()
218 } else {
219 buffers.choose(rng).unwrap()
220 };
221
222 let buffer = buffer_handle.read(cx);
223 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
224 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
225 let header_height = rng.gen_range(0..=5);
226 log::info!(
227 "Inserting excerpt from buffer {} with header height {} and range {:?}: {:?}",
228 buffer_handle.id(),
229 header_height,
230 start_ix..end_ix,
231 &buffer.text()[start_ix..end_ix]
232 );
233
234 multibuffer.push_excerpt(
235 ExcerptProperties {
236 buffer: buffer_handle,
237 range: start_ix..end_ix,
238 },
239 cx,
240 );
241 }
242 multibuffer
243 })
244 }
245
246 pub fn replica_id(&self) -> ReplicaId {
247 self.replica_id
248 }
249
250 pub fn snapshot(&self, cx: &AppContext) -> MultiBufferSnapshot {
251 self.sync(cx);
252 self.snapshot.borrow().clone()
253 }
254
255 pub fn read(&self, cx: &AppContext) -> Ref<MultiBufferSnapshot> {
256 self.sync(cx);
257 self.snapshot.borrow()
258 }
259
260 pub fn as_singleton(&self) -> Option<ModelHandle<Buffer>> {
261 if self.singleton {
262 return Some(
263 self.buffers
264 .borrow()
265 .values()
266 .next()
267 .unwrap()
268 .buffer
269 .clone(),
270 );
271 } else {
272 None
273 }
274 }
275
276 pub fn subscribe(&mut self) -> Subscription {
277 self.subscriptions.subscribe()
278 }
279
280 pub fn edit<I, S, T>(&mut self, ranges: I, new_text: T, cx: &mut ModelContext<Self>)
281 where
282 I: IntoIterator<Item = Range<S>>,
283 S: ToOffset,
284 T: Into<String>,
285 {
286 self.edit_internal(ranges, new_text, false, cx)
287 }
288
289 pub fn edit_with_autoindent<I, S, T>(
290 &mut self,
291 ranges: I,
292 new_text: T,
293 cx: &mut ModelContext<Self>,
294 ) where
295 I: IntoIterator<Item = Range<S>>,
296 S: ToOffset,
297 T: Into<String>,
298 {
299 self.edit_internal(ranges, new_text, true, cx)
300 }
301
302 pub fn edit_internal<I, S, T>(
303 &mut self,
304 ranges_iter: I,
305 new_text: T,
306 autoindent: bool,
307 cx: &mut ModelContext<Self>,
308 ) where
309 I: IntoIterator<Item = Range<S>>,
310 S: ToOffset,
311 T: Into<String>,
312 {
313 if let Some(buffer) = self.as_singleton() {
314 let snapshot = self.read(cx);
315 let ranges = ranges_iter
316 .into_iter()
317 .map(|range| range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot));
318 return buffer.update(cx, |buffer, cx| {
319 if autoindent {
320 buffer.edit_with_autoindent(ranges, new_text, cx);
321 } else {
322 buffer.edit(ranges, new_text, cx);
323 }
324 });
325 }
326
327 let snapshot = self.read(cx);
328 let mut buffer_edits: HashMap<usize, Vec<(Range<usize>, bool)>> = Default::default();
329 let mut cursor = snapshot.excerpts.cursor::<usize>();
330 for range in ranges_iter {
331 let start = range.start.to_offset(&snapshot);
332 let end = range.end.to_offset(&snapshot);
333 cursor.seek(&start, Bias::Right, &());
334 if cursor.item().is_none() && start == *cursor.start() {
335 cursor.prev(&());
336 }
337 let start_excerpt = cursor.item().expect("start offset out of bounds");
338 let start_overshoot = start - cursor.start();
339 let buffer_start =
340 start_excerpt.range.start.to_offset(&start_excerpt.buffer) + start_overshoot;
341
342 cursor.seek(&end, Bias::Right, &());
343 if cursor.item().is_none() && end == *cursor.start() {
344 cursor.prev(&());
345 }
346 let end_excerpt = cursor.item().expect("end offset out of bounds");
347 let end_overshoot = end - cursor.start();
348 let buffer_end = end_excerpt.range.start.to_offset(&end_excerpt.buffer) + end_overshoot;
349
350 if start_excerpt.id == end_excerpt.id {
351 buffer_edits
352 .entry(start_excerpt.buffer_id)
353 .or_insert(Vec::new())
354 .push((buffer_start..buffer_end, true));
355 } else {
356 let start_excerpt_range =
357 buffer_start..start_excerpt.range.end.to_offset(&start_excerpt.buffer);
358 let end_excerpt_range =
359 end_excerpt.range.start.to_offset(&end_excerpt.buffer)..buffer_end;
360 buffer_edits
361 .entry(start_excerpt.buffer_id)
362 .or_insert(Vec::new())
363 .push((start_excerpt_range, true));
364 buffer_edits
365 .entry(end_excerpt.buffer_id)
366 .or_insert(Vec::new())
367 .push((end_excerpt_range, false));
368
369 cursor.seek(&start, Bias::Right, &());
370 cursor.next(&());
371 while let Some(excerpt) = cursor.item() {
372 if excerpt.id == end_excerpt.id {
373 break;
374 }
375 buffer_edits
376 .entry(excerpt.buffer_id)
377 .or_insert(Vec::new())
378 .push((excerpt.range.to_offset(&excerpt.buffer), false));
379 cursor.next(&());
380 }
381 }
382 }
383
384 let new_text = new_text.into();
385 for (buffer_id, mut edits) in buffer_edits {
386 edits.sort_unstable_by_key(|(range, _)| range.start);
387 self.buffers.borrow()[&buffer_id]
388 .buffer
389 .update(cx, |buffer, cx| {
390 let mut edits = edits.into_iter().peekable();
391 let mut insertions = Vec::new();
392 let mut deletions = Vec::new();
393 while let Some((mut range, mut is_insertion)) = edits.next() {
394 while let Some((next_range, next_is_insertion)) = edits.peek() {
395 if range.end >= next_range.start {
396 range.end = cmp::max(next_range.end, range.end);
397 is_insertion |= *next_is_insertion;
398 edits.next();
399 } else {
400 break;
401 }
402 }
403
404 if is_insertion {
405 insertions.push(
406 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
407 );
408 } else if !range.is_empty() {
409 deletions.push(
410 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
411 );
412 }
413 }
414
415 if autoindent {
416 buffer.edit_with_autoindent(deletions, "", cx);
417 buffer.edit_with_autoindent(insertions, new_text.clone(), cx);
418 } else {
419 buffer.edit(deletions, "", cx);
420 buffer.edit(insertions, new_text.clone(), cx);
421 }
422 })
423 }
424 }
425
426 pub fn start_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
427 self.start_transaction_at(Instant::now(), cx)
428 }
429
430 pub(crate) fn start_transaction_at(
431 &mut self,
432 now: Instant,
433 cx: &mut ModelContext<Self>,
434 ) -> Option<TransactionId> {
435 if let Some(buffer) = self.as_singleton() {
436 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
437 }
438
439 for BufferState { buffer, .. } in self.buffers.borrow().values() {
440 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
441 }
442 self.history.start_transaction(now)
443 }
444
445 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
446 self.end_transaction_at(Instant::now(), cx)
447 }
448
449 pub(crate) fn end_transaction_at(
450 &mut self,
451 now: Instant,
452 cx: &mut ModelContext<Self>,
453 ) -> Option<TransactionId> {
454 if let Some(buffer) = self.as_singleton() {
455 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
456 }
457
458 let mut buffer_transactions = HashSet::default();
459 for BufferState { buffer, .. } in self.buffers.borrow().values() {
460 if let Some(transaction_id) =
461 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
462 {
463 buffer_transactions.insert((buffer.id(), transaction_id));
464 }
465 }
466
467 if self.history.end_transaction(now, buffer_transactions) {
468 let transaction_id = self.history.group().unwrap();
469 Some(transaction_id)
470 } else {
471 None
472 }
473 }
474
475 pub fn avoid_grouping_next_transaction(&mut self, cx: &mut ModelContext<Self>) {
476 for BufferState { buffer, .. } in self.buffers.borrow().values() {
477 buffer.update(cx, |buffer, _| buffer.avoid_grouping_next_transaction());
478 }
479 }
480
481 pub fn set_active_selections(
482 &mut self,
483 selections: &[Selection<Anchor>],
484 cx: &mut ModelContext<Self>,
485 ) {
486 let mut selections_by_buffer: HashMap<usize, Vec<Selection<text::Anchor>>> =
487 Default::default();
488 let snapshot = self.read(cx);
489 let mut cursor = snapshot.excerpts.cursor::<Option<&ExcerptId>>();
490 for selection in selections {
491 cursor.seek(&Some(&selection.start.excerpt_id), Bias::Left, &());
492 while let Some(excerpt) = cursor.item() {
493 if excerpt.id > selection.end.excerpt_id {
494 break;
495 }
496
497 let mut start = excerpt.range.start.clone();
498 let mut end = excerpt.range.end.clone();
499 if excerpt.id == selection.start.excerpt_id {
500 start = selection.start.text_anchor.clone();
501 }
502 if excerpt.id == selection.end.excerpt_id {
503 end = selection.end.text_anchor.clone();
504 }
505 selections_by_buffer
506 .entry(excerpt.buffer_id)
507 .or_default()
508 .push(Selection {
509 id: selection.id,
510 start,
511 end,
512 reversed: selection.reversed,
513 goal: selection.goal,
514 });
515
516 cursor.next(&());
517 }
518 }
519
520 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
521 if !selections_by_buffer.contains_key(buffer_id) {
522 buffer_state
523 .buffer
524 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
525 }
526 }
527
528 for (buffer_id, mut selections) in selections_by_buffer {
529 self.buffers.borrow()[&buffer_id]
530 .buffer
531 .update(cx, |buffer, cx| {
532 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer).unwrap());
533 let mut selections = selections.into_iter().peekable();
534 let merged_selections = Arc::from_iter(iter::from_fn(|| {
535 let mut selection = selections.next()?;
536 while let Some(next_selection) = selections.peek() {
537 if selection
538 .end
539 .cmp(&next_selection.start, buffer)
540 .unwrap()
541 .is_ge()
542 {
543 let next_selection = selections.next().unwrap();
544 if next_selection
545 .end
546 .cmp(&selection.end, buffer)
547 .unwrap()
548 .is_ge()
549 {
550 selection.end = next_selection.end;
551 }
552 } else {
553 break;
554 }
555 }
556 Some(selection)
557 }));
558 buffer.set_active_selections(merged_selections, cx);
559 });
560 }
561 }
562
563 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
564 for buffer in self.buffers.borrow().values() {
565 buffer
566 .buffer
567 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
568 }
569 }
570
571 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
572 if let Some(buffer) = self.as_singleton() {
573 return buffer.update(cx, |buffer, cx| buffer.undo(cx));
574 }
575
576 while let Some(transaction) = self.history.pop_undo() {
577 let mut undone = false;
578 for (buffer_id, buffer_transaction_id) in &transaction.buffer_transactions {
579 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(&buffer_id) {
580 undone |= buffer.update(cx, |buf, cx| {
581 buf.undo_transaction(*buffer_transaction_id, cx)
582 });
583 }
584 }
585
586 if undone {
587 return Some(transaction.id);
588 }
589 }
590
591 None
592 }
593
594 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
595 if let Some(buffer) = self.as_singleton() {
596 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
597 }
598
599 while let Some(transaction) = self.history.pop_redo() {
600 let mut redone = false;
601 for (buffer_id, buffer_transaction_id) in &transaction.buffer_transactions {
602 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(&buffer_id) {
603 redone |= buffer.update(cx, |buf, cx| {
604 buf.redo_transaction(*buffer_transaction_id, cx)
605 });
606 }
607 }
608
609 if redone {
610 return Some(transaction.id);
611 }
612 }
613
614 None
615 }
616
617 pub fn push_excerpt<O>(
618 &mut self,
619 props: ExcerptProperties<O>,
620 cx: &mut ModelContext<Self>,
621 ) -> ExcerptId
622 where
623 O: text::ToOffset,
624 {
625 self.insert_excerpt_after(&ExcerptId::max(), props, cx)
626 }
627
628 pub fn insert_excerpt_after<O>(
629 &mut self,
630 prev_excerpt_id: &ExcerptId,
631 props: ExcerptProperties<O>,
632 cx: &mut ModelContext<Self>,
633 ) -> ExcerptId
634 where
635 O: text::ToOffset,
636 {
637 assert_eq!(self.history.transaction_depth, 0);
638 self.sync(cx);
639
640 let buffer_snapshot = props.buffer.read(cx).snapshot();
641 let range = buffer_snapshot.anchor_before(&props.range.start)
642 ..buffer_snapshot.anchor_after(&props.range.end);
643 let mut snapshot = self.snapshot.borrow_mut();
644 let mut cursor = snapshot.excerpts.cursor::<Option<&ExcerptId>>();
645 let mut new_excerpts = cursor.slice(&Some(prev_excerpt_id), Bias::Right, &());
646
647 let mut prev_id = ExcerptId::min();
648 let edit_start = new_excerpts.summary().text.bytes;
649 new_excerpts.update_last(
650 |excerpt| {
651 excerpt.has_trailing_newline = true;
652 prev_id = excerpt.id.clone();
653 },
654 &(),
655 );
656
657 let mut next_id = ExcerptId::max();
658 if let Some(next_excerpt) = cursor.item() {
659 next_id = next_excerpt.id.clone();
660 }
661
662 let id = ExcerptId::between(&prev_id, &next_id);
663
664 let mut buffers = self.buffers.borrow_mut();
665 let buffer_state = buffers
666 .entry(props.buffer.id())
667 .or_insert_with(|| BufferState {
668 last_version: buffer_snapshot.version().clone(),
669 last_parse_count: buffer_snapshot.parse_count(),
670 last_selections_update_count: buffer_snapshot.selections_update_count(),
671 last_diagnostics_update_count: buffer_snapshot.diagnostics_update_count(),
672 excerpts: Default::default(),
673 _subscriptions: [
674 cx.observe(&props.buffer, |_, _, cx| cx.notify()),
675 cx.subscribe(&props.buffer, Self::on_buffer_event),
676 ],
677 buffer: props.buffer.clone(),
678 });
679 if let Err(ix) = buffer_state.excerpts.binary_search(&id) {
680 buffer_state.excerpts.insert(ix, id.clone());
681 }
682
683 let excerpt = Excerpt::new(
684 id.clone(),
685 props.buffer.id(),
686 buffer_snapshot,
687 range,
688 cursor.item().is_some(),
689 );
690 new_excerpts.push(excerpt, &());
691 let edit_end = new_excerpts.summary().text.bytes;
692
693 new_excerpts.push_tree(cursor.suffix(&()), &());
694 drop(cursor);
695 snapshot.excerpts = new_excerpts;
696
697 self.subscriptions.publish_mut([Edit {
698 old: edit_start..edit_start,
699 new: edit_start..edit_end,
700 }]);
701
702 cx.notify();
703 id
704 }
705
706 pub fn excerpt_ids_for_buffer(&self, buffer: &ModelHandle<Buffer>) -> Vec<ExcerptId> {
707 self.buffers
708 .borrow()
709 .get(&buffer.id())
710 .map_or(Vec::new(), |state| state.excerpts.clone())
711 }
712
713 pub fn excerpted_buffers<'a, T: ToOffset>(
714 &'a self,
715 range: Range<T>,
716 cx: &AppContext,
717 ) -> Vec<(ModelHandle<Buffer>, Range<usize>)> {
718 let snapshot = self.snapshot(cx);
719 let start = range.start.to_offset(&snapshot);
720 let end = range.end.to_offset(&snapshot);
721
722 let mut result = Vec::new();
723 let mut cursor = snapshot.excerpts.cursor::<usize>();
724 cursor.seek(&start, Bias::Right, &());
725 while let Some(excerpt) = cursor.item() {
726 if *cursor.start() > end {
727 break;
728 }
729
730 let mut end_before_newline = cursor.end(&());
731 if excerpt.has_trailing_newline {
732 end_before_newline -= 1;
733 }
734 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
735 let start = excerpt_start + (cmp::max(start, *cursor.start()) - *cursor.start());
736 let end = excerpt_start + (cmp::min(end, end_before_newline) - *cursor.start());
737 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
738 result.push((buffer, start..end));
739 cursor.next(&());
740 }
741
742 result
743 }
744
745 pub fn remove_excerpts<'a>(
746 &mut self,
747 excerpt_ids: impl IntoIterator<Item = &'a ExcerptId>,
748 cx: &mut ModelContext<Self>,
749 ) {
750 let mut buffers = self.buffers.borrow_mut();
751 let mut snapshot = self.snapshot.borrow_mut();
752 let mut new_excerpts = SumTree::new();
753 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
754 let mut edits = Vec::new();
755 let mut excerpt_ids = excerpt_ids.into_iter().peekable();
756
757 while let Some(mut excerpt_id) = excerpt_ids.next() {
758 // Seek to the next excerpt to remove, preserving any preceding excerpts.
759 new_excerpts.push_tree(cursor.slice(&Some(excerpt_id), Bias::Left, &()), &());
760 if let Some(mut excerpt) = cursor.item() {
761 if excerpt.id != *excerpt_id {
762 continue;
763 }
764 let mut old_start = cursor.start().1;
765
766 // Skip over the removed excerpt.
767 loop {
768 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
769 buffer_state.excerpts.retain(|id| id != excerpt_id);
770 if buffer_state.excerpts.is_empty() {
771 buffers.remove(&excerpt.buffer_id);
772 }
773 }
774 cursor.next(&());
775
776 // Skip over any subsequent excerpts that are also removed.
777 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
778 if let Some(next_excerpt) = cursor.item() {
779 if next_excerpt.id == *next_excerpt_id {
780 excerpt = next_excerpt;
781 excerpt_id = excerpt_ids.next().unwrap();
782 continue;
783 }
784 }
785 }
786
787 break;
788 }
789
790 // When removing the last excerpt, remove the trailing newline from
791 // the previous excerpt.
792 if cursor.item().is_none() && old_start > 0 {
793 old_start -= 1;
794 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
795 }
796
797 // Push an edit for the removal of this run of excerpts.
798 let old_end = cursor.start().1;
799 let new_start = new_excerpts.summary().text.bytes;
800 edits.push(Edit {
801 old: old_start..old_end,
802 new: new_start..new_start,
803 });
804 }
805 }
806 new_excerpts.push_tree(cursor.suffix(&()), &());
807 drop(cursor);
808 snapshot.excerpts = new_excerpts;
809 self.subscriptions.publish_mut(edits);
810 cx.notify();
811 }
812
813 pub fn text_anchor_for_position<'a, T: ToOffset>(
814 &'a self,
815 position: T,
816 cx: &AppContext,
817 ) -> (ModelHandle<Buffer>, language::Anchor) {
818 let snapshot = self.read(cx);
819 let anchor = snapshot.anchor_before(position);
820 (
821 self.buffers.borrow()[&anchor.buffer_id].buffer.clone(),
822 anchor.text_anchor,
823 )
824 }
825
826 fn on_buffer_event(
827 &mut self,
828 _: ModelHandle<Buffer>,
829 event: &Event,
830 cx: &mut ModelContext<Self>,
831 ) {
832 cx.emit(event.clone());
833 }
834
835 pub fn format(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
836 let mut format_tasks = Vec::new();
837 for BufferState { buffer, .. } in self.buffers.borrow().values() {
838 format_tasks.push(buffer.update(cx, |buffer, cx| buffer.format(cx)));
839 }
840
841 cx.spawn(|_, _| async move {
842 for format in format_tasks {
843 format.await?;
844 }
845 Ok(())
846 })
847 }
848
849 pub fn save(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
850 let mut save_tasks = Vec::new();
851 for BufferState { buffer, .. } in self.buffers.borrow().values() {
852 save_tasks.push(buffer.update(cx, |buffer, cx| buffer.save(cx)));
853 }
854
855 cx.spawn(|_, _| async move {
856 for save in save_tasks {
857 save.await?;
858 }
859 Ok(())
860 })
861 }
862
863 pub fn completions<T>(
864 &self,
865 position: T,
866 cx: &mut ModelContext<Self>,
867 ) -> Task<Result<Vec<Completion<Anchor>>>>
868 where
869 T: ToOffset,
870 {
871 let anchor = self.read(cx).anchor_before(position);
872 let buffer = self.buffers.borrow()[&anchor.buffer_id].buffer.clone();
873 let completions =
874 buffer.update(cx, |buffer, cx| buffer.completions(anchor.text_anchor, cx));
875 cx.spawn(|this, cx| async move {
876 completions.await.map(|completions| {
877 let snapshot = this.read_with(&cx, |buffer, cx| buffer.snapshot(cx));
878 completions
879 .into_iter()
880 .map(|completion| Completion {
881 old_range: snapshot.anchor_in_excerpt(
882 anchor.excerpt_id.clone(),
883 completion.old_range.start,
884 )
885 ..snapshot.anchor_in_excerpt(
886 anchor.excerpt_id.clone(),
887 completion.old_range.end,
888 ),
889 new_text: completion.new_text,
890 label: completion.label,
891 lsp_completion: completion.lsp_completion,
892 })
893 .collect()
894 })
895 })
896 }
897
898 pub fn is_completion_trigger<T>(&self, position: T, text: &str, cx: &AppContext) -> bool
899 where
900 T: ToOffset,
901 {
902 let mut chars = text.chars();
903 let char = if let Some(char) = chars.next() {
904 char
905 } else {
906 return false;
907 };
908 if chars.next().is_some() {
909 return false;
910 }
911
912 if char.is_alphanumeric() || char == '_' {
913 return true;
914 }
915
916 let snapshot = self.snapshot(cx);
917 let anchor = snapshot.anchor_before(position);
918 let buffer = self.buffers.borrow()[&anchor.buffer_id].buffer.clone();
919 buffer
920 .read(cx)
921 .completion_triggers()
922 .iter()
923 .any(|string| string == text)
924 }
925
926 pub fn apply_additional_edits_for_completion(
927 &self,
928 completion: Completion<Anchor>,
929 cx: &mut ModelContext<Self>,
930 ) -> Task<Result<()>> {
931 let buffer = if let Some(buffer_state) = self
932 .buffers
933 .borrow()
934 .get(&completion.old_range.start.buffer_id)
935 {
936 buffer_state.buffer.clone()
937 } else {
938 return Task::ready(Ok(()));
939 };
940
941 let apply_edits = buffer.update(cx, |buffer, cx| {
942 buffer.apply_additional_edits_for_completion(
943 Completion {
944 old_range: completion.old_range.start.text_anchor
945 ..completion.old_range.end.text_anchor,
946 new_text: completion.new_text,
947 label: completion.label,
948 lsp_completion: completion.lsp_completion,
949 },
950 true,
951 cx,
952 )
953 });
954 cx.foreground().spawn(async move {
955 apply_edits.await?;
956 Ok(())
957 })
958 }
959
960 pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
961 self.buffers
962 .borrow()
963 .values()
964 .next()
965 .and_then(|state| state.buffer.read(cx).language())
966 }
967
968 pub fn file<'a>(&self, cx: &'a AppContext) -> Option<&'a dyn File> {
969 self.as_singleton()?.read(cx).file()
970 }
971
972 #[cfg(test)]
973 pub fn is_parsing(&self, cx: &AppContext) -> bool {
974 self.as_singleton().unwrap().read(cx).is_parsing()
975 }
976
977 fn sync(&self, cx: &AppContext) {
978 let mut snapshot = self.snapshot.borrow_mut();
979 let mut excerpts_to_edit = Vec::new();
980 let mut reparsed = false;
981 let mut diagnostics_updated = false;
982 let mut is_dirty = false;
983 let mut has_conflict = false;
984 let mut buffers = self.buffers.borrow_mut();
985 for buffer_state in buffers.values_mut() {
986 let buffer = buffer_state.buffer.read(cx);
987 let version = buffer.version();
988 let parse_count = buffer.parse_count();
989 let selections_update_count = buffer.selections_update_count();
990 let diagnostics_update_count = buffer.diagnostics_update_count();
991
992 let buffer_edited = version.changed_since(&buffer_state.last_version);
993 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
994 let buffer_selections_updated =
995 selections_update_count > buffer_state.last_selections_update_count;
996 let buffer_diagnostics_updated =
997 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
998 if buffer_edited
999 || buffer_reparsed
1000 || buffer_selections_updated
1001 || buffer_diagnostics_updated
1002 {
1003 buffer_state.last_version = version;
1004 buffer_state.last_parse_count = parse_count;
1005 buffer_state.last_selections_update_count = selections_update_count;
1006 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
1007 excerpts_to_edit.extend(
1008 buffer_state
1009 .excerpts
1010 .iter()
1011 .map(|excerpt_id| (excerpt_id, buffer_state.buffer.clone(), buffer_edited)),
1012 );
1013 }
1014
1015 reparsed |= buffer_reparsed;
1016 diagnostics_updated |= buffer_diagnostics_updated;
1017 is_dirty |= buffer.is_dirty();
1018 has_conflict |= buffer.has_conflict();
1019 }
1020 if reparsed {
1021 snapshot.parse_count += 1;
1022 }
1023 if diagnostics_updated {
1024 snapshot.diagnostics_update_count += 1;
1025 }
1026 snapshot.is_dirty = is_dirty;
1027 snapshot.has_conflict = has_conflict;
1028
1029 excerpts_to_edit.sort_unstable_by_key(|(excerpt_id, _, _)| *excerpt_id);
1030
1031 let mut edits = Vec::new();
1032 let mut new_excerpts = SumTree::new();
1033 let mut cursor = snapshot.excerpts.cursor::<(Option<&ExcerptId>, usize)>();
1034
1035 for (id, buffer, buffer_edited) in excerpts_to_edit {
1036 new_excerpts.push_tree(cursor.slice(&Some(id), Bias::Left, &()), &());
1037 let old_excerpt = cursor.item().unwrap();
1038 let buffer_id = buffer.id();
1039 let buffer = buffer.read(cx);
1040
1041 let mut new_excerpt;
1042 if buffer_edited {
1043 edits.extend(
1044 buffer
1045 .edits_since_in_range::<usize>(
1046 old_excerpt.buffer.version(),
1047 old_excerpt.range.clone(),
1048 )
1049 .map(|mut edit| {
1050 let excerpt_old_start = cursor.start().1;
1051 let excerpt_new_start = new_excerpts.summary().text.bytes;
1052 edit.old.start += excerpt_old_start;
1053 edit.old.end += excerpt_old_start;
1054 edit.new.start += excerpt_new_start;
1055 edit.new.end += excerpt_new_start;
1056 edit
1057 }),
1058 );
1059
1060 new_excerpt = Excerpt::new(
1061 id.clone(),
1062 buffer_id,
1063 buffer.snapshot(),
1064 old_excerpt.range.clone(),
1065 old_excerpt.has_trailing_newline,
1066 );
1067 } else {
1068 new_excerpt = old_excerpt.clone();
1069 new_excerpt.buffer = buffer.snapshot();
1070 }
1071
1072 new_excerpts.push(new_excerpt, &());
1073 cursor.next(&());
1074 }
1075 new_excerpts.push_tree(cursor.suffix(&()), &());
1076
1077 drop(cursor);
1078 snapshot.excerpts = new_excerpts;
1079
1080 self.subscriptions.publish(edits);
1081 }
1082}
1083
1084#[cfg(any(test, feature = "test-support"))]
1085impl MultiBuffer {
1086 pub fn randomly_edit(
1087 &mut self,
1088 rng: &mut impl rand::Rng,
1089 count: usize,
1090 cx: &mut ModelContext<Self>,
1091 ) {
1092 use text::RandomCharIter;
1093
1094 let snapshot = self.read(cx);
1095 let mut old_ranges: Vec<Range<usize>> = Vec::new();
1096 for _ in 0..count {
1097 let last_end = old_ranges.last().map_or(0, |last_range| last_range.end + 1);
1098 if last_end > snapshot.len() {
1099 break;
1100 }
1101 let end_ix = snapshot.clip_offset(rng.gen_range(0..=last_end), Bias::Right);
1102 let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1103 old_ranges.push(start_ix..end_ix);
1104 }
1105 let new_text_len = rng.gen_range(0..10);
1106 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1107 log::info!("mutating multi-buffer at {:?}: {:?}", old_ranges, new_text);
1108 drop(snapshot);
1109
1110 self.edit(old_ranges.iter().cloned(), new_text.as_str(), cx);
1111 }
1112}
1113
1114impl Entity for MultiBuffer {
1115 type Event = language::Event;
1116}
1117
1118impl MultiBufferSnapshot {
1119 pub fn text(&self) -> String {
1120 self.chunks(0..self.len(), false)
1121 .map(|chunk| chunk.text)
1122 .collect()
1123 }
1124
1125 pub fn reversed_chars_at<'a, T: ToOffset>(
1126 &'a self,
1127 position: T,
1128 ) -> impl Iterator<Item = char> + 'a {
1129 let mut offset = position.to_offset(self);
1130 let mut cursor = self.excerpts.cursor::<usize>();
1131 cursor.seek(&offset, Bias::Left, &());
1132 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1133 let end_before_footer = cursor.start() + excerpt.text_summary.bytes;
1134 let start = excerpt.range.start.to_offset(&excerpt.buffer);
1135 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1136 excerpt.buffer.reversed_chunks_in_range(start..end)
1137 });
1138 iter::from_fn(move || {
1139 if offset == *cursor.start() {
1140 cursor.prev(&());
1141 let excerpt = cursor.item()?;
1142 excerpt_chunks = Some(
1143 excerpt
1144 .buffer
1145 .reversed_chunks_in_range(excerpt.range.clone()),
1146 );
1147 }
1148
1149 let excerpt = cursor.item().unwrap();
1150 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1151 offset -= 1;
1152 Some("\n")
1153 } else {
1154 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1155 offset -= chunk.len();
1156 Some(chunk)
1157 }
1158 })
1159 .flat_map(|c| c.chars().rev())
1160 }
1161
1162 pub fn chars_at<'a, T: ToOffset>(&'a self, position: T) -> impl Iterator<Item = char> + 'a {
1163 let offset = position.to_offset(self);
1164 self.text_for_range(offset..self.len())
1165 .flat_map(|chunk| chunk.chars())
1166 }
1167
1168 pub fn text_for_range<'a, T: ToOffset>(
1169 &'a self,
1170 range: Range<T>,
1171 ) -> impl Iterator<Item = &'a str> {
1172 self.chunks(range, false).map(|chunk| chunk.text)
1173 }
1174
1175 pub fn is_line_blank(&self, row: u32) -> bool {
1176 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1177 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1178 }
1179
1180 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1181 where
1182 T: ToOffset,
1183 {
1184 let position = position.to_offset(self);
1185 position == self.clip_offset(position, Bias::Left)
1186 && self
1187 .bytes_in_range(position..self.len())
1188 .flatten()
1189 .copied()
1190 .take(needle.len())
1191 .eq(needle.bytes())
1192 }
1193
1194 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
1195 let mut start = start.to_offset(self);
1196 let mut end = start;
1197 let mut next_chars = self.chars_at(start).peekable();
1198 let mut prev_chars = self.reversed_chars_at(start).peekable();
1199 let word_kind = cmp::max(
1200 prev_chars.peek().copied().map(char_kind),
1201 next_chars.peek().copied().map(char_kind),
1202 );
1203
1204 for ch in prev_chars {
1205 if Some(char_kind(ch)) == word_kind {
1206 start -= ch.len_utf8();
1207 } else {
1208 break;
1209 }
1210 }
1211
1212 for ch in next_chars {
1213 if Some(char_kind(ch)) == word_kind {
1214 end += ch.len_utf8();
1215 } else {
1216 break;
1217 }
1218 }
1219
1220 (start..end, word_kind)
1221 }
1222
1223 fn as_singleton(&self) -> Option<&Excerpt> {
1224 if self.singleton {
1225 self.excerpts.iter().next()
1226 } else {
1227 None
1228 }
1229 }
1230
1231 pub fn len(&self) -> usize {
1232 self.excerpts.summary().text.bytes
1233 }
1234
1235 pub fn max_buffer_row(&self) -> u32 {
1236 self.excerpts.summary().max_buffer_row
1237 }
1238
1239 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1240 if let Some(excerpt) = self.as_singleton() {
1241 return excerpt.buffer.clip_offset(offset, bias);
1242 }
1243
1244 let mut cursor = self.excerpts.cursor::<usize>();
1245 cursor.seek(&offset, Bias::Right, &());
1246 let overshoot = if let Some(excerpt) = cursor.item() {
1247 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1248 let buffer_offset = excerpt
1249 .buffer
1250 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1251 buffer_offset.saturating_sub(excerpt_start)
1252 } else {
1253 0
1254 };
1255 cursor.start() + overshoot
1256 }
1257
1258 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1259 if let Some(excerpt) = self.as_singleton() {
1260 return excerpt.buffer.clip_point(point, bias);
1261 }
1262
1263 let mut cursor = self.excerpts.cursor::<Point>();
1264 cursor.seek(&point, Bias::Right, &());
1265 let overshoot = if let Some(excerpt) = cursor.item() {
1266 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1267 let buffer_point = excerpt
1268 .buffer
1269 .clip_point(excerpt_start + (point - cursor.start()), bias);
1270 buffer_point.saturating_sub(excerpt_start)
1271 } else {
1272 Point::zero()
1273 };
1274 *cursor.start() + overshoot
1275 }
1276
1277 pub fn clip_point_utf16(&self, point: PointUtf16, bias: Bias) -> PointUtf16 {
1278 if let Some(excerpt) = self.as_singleton() {
1279 return excerpt.buffer.clip_point_utf16(point, bias);
1280 }
1281
1282 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1283 cursor.seek(&point, Bias::Right, &());
1284 let overshoot = if let Some(excerpt) = cursor.item() {
1285 let excerpt_start = excerpt
1286 .buffer
1287 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1288 let buffer_point = excerpt
1289 .buffer
1290 .clip_point_utf16(excerpt_start + (point - cursor.start()), bias);
1291 buffer_point.saturating_sub(excerpt_start)
1292 } else {
1293 PointUtf16::zero()
1294 };
1295 *cursor.start() + overshoot
1296 }
1297
1298 pub fn bytes_in_range<'a, T: ToOffset>(&'a self, range: Range<T>) -> MultiBufferBytes<'a> {
1299 let range = range.start.to_offset(self)..range.end.to_offset(self);
1300 let mut excerpts = self.excerpts.cursor::<usize>();
1301 excerpts.seek(&range.start, Bias::Right, &());
1302
1303 let mut chunk = &[][..];
1304 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1305 let mut excerpt_bytes = excerpt
1306 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1307 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1308 Some(excerpt_bytes)
1309 } else {
1310 None
1311 };
1312
1313 MultiBufferBytes {
1314 range,
1315 excerpts,
1316 excerpt_bytes,
1317 chunk,
1318 }
1319 }
1320
1321 pub fn buffer_rows<'a>(&'a self, start_row: u32) -> MultiBufferRows<'a> {
1322 let mut result = MultiBufferRows {
1323 buffer_row_range: 0..0,
1324 excerpts: self.excerpts.cursor(),
1325 };
1326 result.seek(start_row);
1327 result
1328 }
1329
1330 pub fn chunks<'a, T: ToOffset>(
1331 &'a self,
1332 range: Range<T>,
1333 language_aware: bool,
1334 ) -> MultiBufferChunks<'a> {
1335 let range = range.start.to_offset(self)..range.end.to_offset(self);
1336 let mut chunks = MultiBufferChunks {
1337 range: range.clone(),
1338 excerpts: self.excerpts.cursor(),
1339 excerpt_chunks: None,
1340 language_aware,
1341 };
1342 chunks.seek(range.start);
1343 chunks
1344 }
1345
1346 pub fn offset_to_point(&self, offset: usize) -> Point {
1347 if let Some(excerpt) = self.as_singleton() {
1348 return excerpt.buffer.offset_to_point(offset);
1349 }
1350
1351 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
1352 cursor.seek(&offset, Bias::Right, &());
1353 if let Some(excerpt) = cursor.item() {
1354 let (start_offset, start_point) = cursor.start();
1355 let overshoot = offset - start_offset;
1356 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1357 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1358 let buffer_point = excerpt
1359 .buffer
1360 .offset_to_point(excerpt_start_offset + overshoot);
1361 *start_point + (buffer_point - excerpt_start_point)
1362 } else {
1363 self.excerpts.summary().text.lines
1364 }
1365 }
1366
1367 pub fn offset_to_point_utf16(&self, offset: usize) -> PointUtf16 {
1368 if let Some(excerpt) = self.as_singleton() {
1369 return excerpt.buffer.offset_to_point_utf16(offset);
1370 }
1371
1372 let mut cursor = self.excerpts.cursor::<(usize, PointUtf16)>();
1373 cursor.seek(&offset, Bias::Right, &());
1374 if let Some(excerpt) = cursor.item() {
1375 let (start_offset, start_point) = cursor.start();
1376 let overshoot = offset - start_offset;
1377 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1378 let excerpt_start_point = excerpt.range.start.to_point_utf16(&excerpt.buffer);
1379 let buffer_point = excerpt
1380 .buffer
1381 .offset_to_point_utf16(excerpt_start_offset + overshoot);
1382 *start_point + (buffer_point - excerpt_start_point)
1383 } else {
1384 self.excerpts.summary().text.lines_utf16
1385 }
1386 }
1387
1388 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
1389 if let Some(excerpt) = self.as_singleton() {
1390 return excerpt.buffer.point_to_point_utf16(point);
1391 }
1392
1393 let mut cursor = self.excerpts.cursor::<(Point, PointUtf16)>();
1394 cursor.seek(&point, Bias::Right, &());
1395 if let Some(excerpt) = cursor.item() {
1396 let (start_offset, start_point) = cursor.start();
1397 let overshoot = point - start_offset;
1398 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1399 let excerpt_start_point_utf16 = excerpt.range.start.to_point_utf16(&excerpt.buffer);
1400 let buffer_point = excerpt
1401 .buffer
1402 .point_to_point_utf16(excerpt_start_point + overshoot);
1403 *start_point + (buffer_point - excerpt_start_point_utf16)
1404 } else {
1405 self.excerpts.summary().text.lines_utf16
1406 }
1407 }
1408
1409 pub fn point_to_offset(&self, point: Point) -> usize {
1410 if let Some(excerpt) = self.as_singleton() {
1411 return excerpt.buffer.point_to_offset(point);
1412 }
1413
1414 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
1415 cursor.seek(&point, Bias::Right, &());
1416 if let Some(excerpt) = cursor.item() {
1417 let (start_point, start_offset) = cursor.start();
1418 let overshoot = point - start_point;
1419 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1420 let excerpt_start_point = excerpt.range.start.to_point(&excerpt.buffer);
1421 let buffer_offset = excerpt
1422 .buffer
1423 .point_to_offset(excerpt_start_point + overshoot);
1424 *start_offset + buffer_offset - excerpt_start_offset
1425 } else {
1426 self.excerpts.summary().text.bytes
1427 }
1428 }
1429
1430 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
1431 if let Some(excerpt) = self.as_singleton() {
1432 return excerpt.buffer.point_utf16_to_offset(point);
1433 }
1434
1435 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
1436 cursor.seek(&point, Bias::Right, &());
1437 if let Some(excerpt) = cursor.item() {
1438 let (start_point, start_offset) = cursor.start();
1439 let overshoot = point - start_point;
1440 let excerpt_start_offset = excerpt.range.start.to_offset(&excerpt.buffer);
1441 let excerpt_start_point = excerpt
1442 .buffer
1443 .offset_to_point_utf16(excerpt.range.start.to_offset(&excerpt.buffer));
1444 let buffer_offset = excerpt
1445 .buffer
1446 .point_utf16_to_offset(excerpt_start_point + overshoot);
1447 *start_offset + (buffer_offset - excerpt_start_offset)
1448 } else {
1449 self.excerpts.summary().text.bytes
1450 }
1451 }
1452
1453 pub fn indent_column_for_line(&self, row: u32) -> u32 {
1454 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
1455 buffer
1456 .indent_column_for_line(range.start.row)
1457 .min(range.end.column)
1458 .saturating_sub(range.start.column)
1459 } else {
1460 0
1461 }
1462 }
1463
1464 pub fn line_len(&self, row: u32) -> u32 {
1465 if let Some((_, range)) = self.buffer_line_for_row(row) {
1466 range.end.column - range.start.column
1467 } else {
1468 0
1469 }
1470 }
1471
1472 fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
1473 let mut cursor = self.excerpts.cursor::<Point>();
1474 cursor.seek(&Point::new(row, 0), Bias::Right, &());
1475 if let Some(excerpt) = cursor.item() {
1476 let overshoot = row - cursor.start().row;
1477 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer);
1478 let excerpt_end = excerpt.range.end.to_point(&excerpt.buffer);
1479 let buffer_row = excerpt_start.row + overshoot;
1480 let line_start = Point::new(buffer_row, 0);
1481 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
1482 return Some((
1483 &excerpt.buffer,
1484 line_start.max(excerpt_start)..line_end.min(excerpt_end),
1485 ));
1486 }
1487 None
1488 }
1489
1490 pub fn max_point(&self) -> Point {
1491 self.text_summary().lines
1492 }
1493
1494 pub fn text_summary(&self) -> TextSummary {
1495 self.excerpts.summary().text
1496 }
1497
1498 pub fn text_summary_for_range<'a, D, O>(&'a self, range: Range<O>) -> D
1499 where
1500 D: TextDimension,
1501 O: ToOffset,
1502 {
1503 let mut summary = D::default();
1504 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1505 let mut cursor = self.excerpts.cursor::<usize>();
1506 cursor.seek(&range.start, Bias::Right, &());
1507 if let Some(excerpt) = cursor.item() {
1508 let mut end_before_newline = cursor.end(&());
1509 if excerpt.has_trailing_newline {
1510 end_before_newline -= 1;
1511 }
1512
1513 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1514 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
1515 let end_in_excerpt =
1516 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
1517 summary.add_assign(
1518 &excerpt
1519 .buffer
1520 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
1521 );
1522
1523 if range.end > end_before_newline {
1524 summary.add_assign(&D::from_text_summary(&TextSummary {
1525 bytes: 1,
1526 lines: Point::new(1 as u32, 0),
1527 lines_utf16: PointUtf16::new(1 as u32, 0),
1528 first_line_chars: 0,
1529 last_line_chars: 0,
1530 longest_row: 0,
1531 longest_row_chars: 0,
1532 }));
1533 }
1534
1535 cursor.next(&());
1536 }
1537
1538 if range.end > *cursor.start() {
1539 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
1540 &range.end,
1541 Bias::Right,
1542 &(),
1543 )));
1544 if let Some(excerpt) = cursor.item() {
1545 range.end = cmp::max(*cursor.start(), range.end);
1546
1547 let excerpt_start = excerpt.range.start.to_offset(&excerpt.buffer);
1548 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
1549 summary.add_assign(
1550 &excerpt
1551 .buffer
1552 .text_summary_for_range(excerpt_start..end_in_excerpt),
1553 );
1554 }
1555 }
1556
1557 summary
1558 }
1559
1560 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
1561 where
1562 D: TextDimension + Ord + Sub<D, Output = D>,
1563 {
1564 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1565 cursor.seek(&Some(&anchor.excerpt_id), Bias::Left, &());
1566 if cursor.item().is_none() {
1567 cursor.next(&());
1568 }
1569
1570 let mut position = D::from_text_summary(&cursor.start().text);
1571 if let Some(excerpt) = cursor.item() {
1572 if excerpt.id == anchor.excerpt_id && excerpt.buffer_id == anchor.buffer_id {
1573 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1574 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1575 let buffer_position = cmp::min(
1576 excerpt_buffer_end,
1577 anchor.text_anchor.summary::<D>(&excerpt.buffer),
1578 );
1579 if buffer_position > excerpt_buffer_start {
1580 position.add_assign(&(buffer_position - excerpt_buffer_start));
1581 }
1582 }
1583 }
1584 position
1585 }
1586
1587 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
1588 where
1589 D: TextDimension + Ord + Sub<D, Output = D>,
1590 I: 'a + IntoIterator<Item = &'a Anchor>,
1591 {
1592 if let Some(excerpt) = self.as_singleton() {
1593 return excerpt
1594 .buffer
1595 .summaries_for_anchors(anchors.into_iter().map(|a| &a.text_anchor))
1596 .collect();
1597 }
1598
1599 let mut anchors = anchors.into_iter().peekable();
1600 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
1601 let mut summaries = Vec::new();
1602 while let Some(anchor) = anchors.peek() {
1603 let excerpt_id = &anchor.excerpt_id;
1604 let buffer_id = anchor.buffer_id;
1605 let excerpt_anchors = iter::from_fn(|| {
1606 let anchor = anchors.peek()?;
1607 if anchor.excerpt_id == *excerpt_id && anchor.buffer_id == buffer_id {
1608 Some(&anchors.next().unwrap().text_anchor)
1609 } else {
1610 None
1611 }
1612 });
1613
1614 cursor.seek_forward(&Some(excerpt_id), Bias::Left, &());
1615 if cursor.item().is_none() {
1616 cursor.next(&());
1617 }
1618
1619 let position = D::from_text_summary(&cursor.start().text);
1620 if let Some(excerpt) = cursor.item() {
1621 if excerpt.id == *excerpt_id && excerpt.buffer_id == buffer_id {
1622 let excerpt_buffer_start = excerpt.range.start.summary::<D>(&excerpt.buffer);
1623 let excerpt_buffer_end = excerpt.range.end.summary::<D>(&excerpt.buffer);
1624 summaries.extend(
1625 excerpt
1626 .buffer
1627 .summaries_for_anchors::<D, _>(excerpt_anchors)
1628 .map(move |summary| {
1629 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
1630 let mut position = position.clone();
1631 let excerpt_buffer_start = excerpt_buffer_start.clone();
1632 if summary > excerpt_buffer_start {
1633 position.add_assign(&(summary - excerpt_buffer_start));
1634 }
1635 position
1636 }),
1637 );
1638 continue;
1639 }
1640 }
1641
1642 summaries.extend(excerpt_anchors.map(|_| position.clone()));
1643 }
1644
1645 summaries
1646 }
1647
1648 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
1649 where
1650 I: 'a + IntoIterator<Item = &'a Anchor>,
1651 {
1652 let mut anchors = anchors.into_iter().enumerate().peekable();
1653 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1654 let mut result = Vec::new();
1655 while let Some((_, anchor)) = anchors.peek() {
1656 let old_excerpt_id = &anchor.excerpt_id;
1657
1658 // Find the location where this anchor's excerpt should be.
1659 cursor.seek_forward(&Some(old_excerpt_id), Bias::Left, &());
1660 if cursor.item().is_none() {
1661 cursor.next(&());
1662 }
1663
1664 let next_excerpt = cursor.item();
1665 let prev_excerpt = cursor.prev_item();
1666
1667 // Process all of the anchors for this excerpt.
1668 while let Some((_, anchor)) = anchors.peek() {
1669 if anchor.excerpt_id != *old_excerpt_id {
1670 break;
1671 }
1672 let mut kept_position = false;
1673 let (anchor_ix, anchor) = anchors.next().unwrap();
1674 let mut anchor = anchor.clone();
1675
1676 // Leave min and max anchors unchanged.
1677 if *old_excerpt_id == ExcerptId::max() || *old_excerpt_id == ExcerptId::min() {
1678 kept_position = true;
1679 }
1680 // If the old excerpt still exists at this location, then leave
1681 // the anchor unchanged.
1682 else if next_excerpt.map_or(false, |excerpt| {
1683 excerpt.id == *old_excerpt_id && excerpt.contains(&anchor)
1684 }) {
1685 kept_position = true;
1686 }
1687 // If the old excerpt no longer exists at this location, then attempt to
1688 // find an equivalent position for this anchor in an adjacent excerpt.
1689 else {
1690 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
1691 if excerpt.contains(&anchor) {
1692 anchor.excerpt_id = excerpt.id.clone();
1693 kept_position = true;
1694 break;
1695 }
1696 }
1697 }
1698 // If there's no adjacent excerpt that contains the anchor's position,
1699 // then report that the anchor has lost its position.
1700 if !kept_position {
1701 anchor = if let Some(excerpt) = next_excerpt {
1702 let mut text_anchor = excerpt
1703 .range
1704 .start
1705 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1706 if text_anchor
1707 .cmp(&excerpt.range.end, &excerpt.buffer)
1708 .unwrap()
1709 .is_gt()
1710 {
1711 text_anchor = excerpt.range.end.clone();
1712 }
1713 Anchor {
1714 buffer_id: excerpt.buffer_id,
1715 excerpt_id: excerpt.id.clone(),
1716 text_anchor,
1717 }
1718 } else if let Some(excerpt) = prev_excerpt {
1719 let mut text_anchor = excerpt
1720 .range
1721 .end
1722 .bias(anchor.text_anchor.bias, &excerpt.buffer);
1723 if text_anchor
1724 .cmp(&excerpt.range.start, &excerpt.buffer)
1725 .unwrap()
1726 .is_lt()
1727 {
1728 text_anchor = excerpt.range.start.clone();
1729 }
1730 Anchor {
1731 buffer_id: excerpt.buffer_id,
1732 excerpt_id: excerpt.id.clone(),
1733 text_anchor,
1734 }
1735 } else if anchor.text_anchor.bias == Bias::Left {
1736 Anchor::min()
1737 } else {
1738 Anchor::max()
1739 };
1740 }
1741
1742 result.push((anchor_ix, anchor, kept_position));
1743 }
1744 }
1745 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self).unwrap());
1746 result
1747 }
1748
1749 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
1750 self.anchor_at(position, Bias::Left)
1751 }
1752
1753 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
1754 self.anchor_at(position, Bias::Right)
1755 }
1756
1757 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
1758 let offset = position.to_offset(self);
1759 if let Some(excerpt) = self.as_singleton() {
1760 return Anchor {
1761 buffer_id: excerpt.buffer_id,
1762 excerpt_id: excerpt.id.clone(),
1763 text_anchor: excerpt.buffer.anchor_at(offset, bias),
1764 };
1765 }
1766
1767 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1768 cursor.seek(&offset, Bias::Right, &());
1769 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
1770 cursor.prev(&());
1771 }
1772 if let Some(excerpt) = cursor.item() {
1773 let mut overshoot = offset.saturating_sub(cursor.start().0);
1774 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
1775 overshoot -= 1;
1776 bias = Bias::Right;
1777 }
1778
1779 let buffer_start = excerpt.range.start.to_offset(&excerpt.buffer);
1780 let text_anchor =
1781 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
1782 Anchor {
1783 buffer_id: excerpt.buffer_id,
1784 excerpt_id: excerpt.id.clone(),
1785 text_anchor,
1786 }
1787 } else if offset == 0 && bias == Bias::Left {
1788 Anchor::min()
1789 } else {
1790 Anchor::max()
1791 }
1792 }
1793
1794 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
1795 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
1796 cursor.seek(&Some(&excerpt_id), Bias::Left, &());
1797 if let Some(excerpt) = cursor.item() {
1798 if excerpt.id == excerpt_id {
1799 let text_anchor = excerpt.clip_anchor(text_anchor);
1800 drop(cursor);
1801 return Anchor {
1802 buffer_id: excerpt.buffer_id,
1803 excerpt_id,
1804 text_anchor,
1805 };
1806 }
1807 }
1808 panic!("excerpt not found");
1809 }
1810
1811 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
1812 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
1813 true
1814 } else if let Some((buffer_id, buffer_snapshot)) =
1815 self.buffer_snapshot_for_excerpt(&anchor.excerpt_id)
1816 {
1817 anchor.buffer_id == buffer_id && buffer_snapshot.can_resolve(&anchor.text_anchor)
1818 } else {
1819 false
1820 }
1821 }
1822
1823 pub fn range_contains_excerpt_boundary<T: ToOffset>(&self, range: Range<T>) -> bool {
1824 let start = range.start.to_offset(self);
1825 let end = range.end.to_offset(self);
1826 let mut cursor = self.excerpts.cursor::<(usize, Option<&ExcerptId>)>();
1827 cursor.seek(&start, Bias::Right, &());
1828 let start_id = cursor
1829 .item()
1830 .or_else(|| cursor.prev_item())
1831 .map(|excerpt| &excerpt.id);
1832 cursor.seek_forward(&end, Bias::Right, &());
1833 let end_id = cursor
1834 .item()
1835 .or_else(|| cursor.prev_item())
1836 .map(|excerpt| &excerpt.id);
1837 start_id != end_id
1838 }
1839
1840 pub fn parse_count(&self) -> usize {
1841 self.parse_count
1842 }
1843
1844 pub fn enclosing_bracket_ranges<T: ToOffset>(
1845 &self,
1846 range: Range<T>,
1847 ) -> Option<(Range<usize>, Range<usize>)> {
1848 let range = range.start.to_offset(self)..range.end.to_offset(self);
1849
1850 let mut cursor = self.excerpts.cursor::<usize>();
1851 cursor.seek(&range.start, Bias::Right, &());
1852 let start_excerpt = cursor.item();
1853
1854 cursor.seek(&range.end, Bias::Right, &());
1855 let end_excerpt = cursor.item();
1856
1857 start_excerpt
1858 .zip(end_excerpt)
1859 .and_then(|(start_excerpt, end_excerpt)| {
1860 if start_excerpt.id != end_excerpt.id {
1861 return None;
1862 }
1863
1864 let excerpt_buffer_start =
1865 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1866 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1867
1868 let start_in_buffer =
1869 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1870 let end_in_buffer =
1871 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1872 let (mut start_bracket_range, mut end_bracket_range) = start_excerpt
1873 .buffer
1874 .enclosing_bracket_ranges(start_in_buffer..end_in_buffer)?;
1875
1876 if start_bracket_range.start >= excerpt_buffer_start
1877 && end_bracket_range.end < excerpt_buffer_end
1878 {
1879 start_bracket_range.start =
1880 cursor.start() + (start_bracket_range.start - excerpt_buffer_start);
1881 start_bracket_range.end =
1882 cursor.start() + (start_bracket_range.end - excerpt_buffer_start);
1883 end_bracket_range.start =
1884 cursor.start() + (end_bracket_range.start - excerpt_buffer_start);
1885 end_bracket_range.end =
1886 cursor.start() + (end_bracket_range.end - excerpt_buffer_start);
1887 Some((start_bracket_range, end_bracket_range))
1888 } else {
1889 None
1890 }
1891 })
1892 }
1893
1894 pub fn diagnostics_update_count(&self) -> usize {
1895 self.diagnostics_update_count
1896 }
1897
1898 pub fn language(&self) -> Option<&Arc<Language>> {
1899 self.excerpts
1900 .iter()
1901 .next()
1902 .and_then(|excerpt| excerpt.buffer.language())
1903 }
1904
1905 pub fn is_dirty(&self) -> bool {
1906 self.is_dirty
1907 }
1908
1909 pub fn has_conflict(&self) -> bool {
1910 self.has_conflict
1911 }
1912
1913 pub fn diagnostic_group<'a, O>(
1914 &'a self,
1915 group_id: usize,
1916 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1917 where
1918 O: text::FromAnchor + 'a,
1919 {
1920 self.as_singleton()
1921 .into_iter()
1922 .flat_map(move |excerpt| excerpt.buffer.diagnostic_group(group_id))
1923 }
1924
1925 pub fn diagnostics_in_range<'a, T, O>(
1926 &'a self,
1927 range: Range<T>,
1928 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
1929 where
1930 T: 'a + ToOffset,
1931 O: 'a + text::FromAnchor,
1932 {
1933 self.as_singleton().into_iter().flat_map(move |excerpt| {
1934 excerpt
1935 .buffer
1936 .diagnostics_in_range(range.start.to_offset(self)..range.end.to_offset(self))
1937 })
1938 }
1939
1940 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1941 let range = range.start.to_offset(self)..range.end.to_offset(self);
1942
1943 let mut cursor = self.excerpts.cursor::<usize>();
1944 cursor.seek(&range.start, Bias::Right, &());
1945 let start_excerpt = cursor.item();
1946
1947 cursor.seek(&range.end, Bias::Right, &());
1948 let end_excerpt = cursor.item();
1949
1950 start_excerpt
1951 .zip(end_excerpt)
1952 .and_then(|(start_excerpt, end_excerpt)| {
1953 if start_excerpt.id != end_excerpt.id {
1954 return None;
1955 }
1956
1957 let excerpt_buffer_start =
1958 start_excerpt.range.start.to_offset(&start_excerpt.buffer);
1959 let excerpt_buffer_end = excerpt_buffer_start + start_excerpt.text_summary.bytes;
1960
1961 let start_in_buffer =
1962 excerpt_buffer_start + range.start.saturating_sub(*cursor.start());
1963 let end_in_buffer =
1964 excerpt_buffer_start + range.end.saturating_sub(*cursor.start());
1965 let mut ancestor_buffer_range = start_excerpt
1966 .buffer
1967 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
1968 ancestor_buffer_range.start =
1969 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
1970 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
1971
1972 let start = cursor.start() + (ancestor_buffer_range.start - excerpt_buffer_start);
1973 let end = cursor.start() + (ancestor_buffer_range.end - excerpt_buffer_start);
1974 Some(start..end)
1975 })
1976 }
1977
1978 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
1979 let excerpt = self.as_singleton()?;
1980 let outline = excerpt.buffer.outline(theme)?;
1981 Some(Outline::new(
1982 outline
1983 .items
1984 .into_iter()
1985 .map(|item| OutlineItem {
1986 depth: item.depth,
1987 range: self.anchor_in_excerpt(excerpt.id.clone(), item.range.start)
1988 ..self.anchor_in_excerpt(excerpt.id.clone(), item.range.end),
1989 text: item.text,
1990 highlight_ranges: item.highlight_ranges,
1991 name_ranges: item.name_ranges,
1992 })
1993 .collect(),
1994 ))
1995 }
1996
1997 fn buffer_snapshot_for_excerpt<'a>(
1998 &'a self,
1999 excerpt_id: &'a ExcerptId,
2000 ) -> Option<(usize, &'a BufferSnapshot)> {
2001 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
2002 cursor.seek(&Some(excerpt_id), Bias::Left, &());
2003 if let Some(excerpt) = cursor.item() {
2004 if excerpt.id == *excerpt_id {
2005 return Some((excerpt.buffer_id, &excerpt.buffer));
2006 }
2007 }
2008 None
2009 }
2010
2011 pub fn remote_selections_in_range<'a>(
2012 &'a self,
2013 range: &'a Range<Anchor>,
2014 ) -> impl 'a + Iterator<Item = (ReplicaId, Selection<Anchor>)> {
2015 let mut cursor = self.excerpts.cursor::<Option<&ExcerptId>>();
2016 cursor.seek(&Some(&range.start.excerpt_id), Bias::Left, &());
2017 cursor
2018 .take_while(move |excerpt| excerpt.id <= range.end.excerpt_id)
2019 .flat_map(move |excerpt| {
2020 let mut query_range = excerpt.range.start.clone()..excerpt.range.end.clone();
2021 if excerpt.id == range.start.excerpt_id {
2022 query_range.start = range.start.text_anchor.clone();
2023 }
2024 if excerpt.id == range.end.excerpt_id {
2025 query_range.end = range.end.text_anchor.clone();
2026 }
2027
2028 excerpt
2029 .buffer
2030 .remote_selections_in_range(query_range)
2031 .flat_map(move |(replica_id, selections)| {
2032 selections.map(move |selection| {
2033 let mut start = Anchor {
2034 buffer_id: excerpt.buffer_id,
2035 excerpt_id: excerpt.id.clone(),
2036 text_anchor: selection.start.clone(),
2037 };
2038 let mut end = Anchor {
2039 buffer_id: excerpt.buffer_id,
2040 excerpt_id: excerpt.id.clone(),
2041 text_anchor: selection.end.clone(),
2042 };
2043 if range.start.cmp(&start, self).unwrap().is_gt() {
2044 start = range.start.clone();
2045 }
2046 if range.end.cmp(&end, self).unwrap().is_lt() {
2047 end = range.end.clone();
2048 }
2049
2050 (
2051 replica_id,
2052 Selection {
2053 id: selection.id,
2054 start,
2055 end,
2056 reversed: selection.reversed,
2057 goal: selection.goal,
2058 },
2059 )
2060 })
2061 })
2062 })
2063 }
2064}
2065
2066impl History {
2067 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
2068 self.transaction_depth += 1;
2069 if self.transaction_depth == 1 {
2070 let id = post_inc(&mut self.next_transaction_id);
2071 self.undo_stack.push(Transaction {
2072 id,
2073 buffer_transactions: Default::default(),
2074 first_edit_at: now,
2075 last_edit_at: now,
2076 });
2077 Some(id)
2078 } else {
2079 None
2080 }
2081 }
2082
2083 fn end_transaction(
2084 &mut self,
2085 now: Instant,
2086 buffer_transactions: HashSet<(usize, TransactionId)>,
2087 ) -> bool {
2088 assert_ne!(self.transaction_depth, 0);
2089 self.transaction_depth -= 1;
2090 if self.transaction_depth == 0 {
2091 if buffer_transactions.is_empty() {
2092 self.undo_stack.pop();
2093 false
2094 } else {
2095 let transaction = self.undo_stack.last_mut().unwrap();
2096 transaction.last_edit_at = now;
2097 transaction.buffer_transactions.extend(buffer_transactions);
2098 true
2099 }
2100 } else {
2101 false
2102 }
2103 }
2104
2105 fn pop_undo(&mut self) -> Option<&Transaction> {
2106 assert_eq!(self.transaction_depth, 0);
2107 if let Some(transaction) = self.undo_stack.pop() {
2108 self.redo_stack.push(transaction);
2109 self.redo_stack.last()
2110 } else {
2111 None
2112 }
2113 }
2114
2115 fn pop_redo(&mut self) -> Option<&Transaction> {
2116 assert_eq!(self.transaction_depth, 0);
2117 if let Some(transaction) = self.redo_stack.pop() {
2118 self.undo_stack.push(transaction);
2119 self.undo_stack.last()
2120 } else {
2121 None
2122 }
2123 }
2124
2125 fn group(&mut self) -> Option<TransactionId> {
2126 let mut new_len = self.undo_stack.len();
2127 let mut transactions = self.undo_stack.iter_mut();
2128
2129 if let Some(mut transaction) = transactions.next_back() {
2130 while let Some(prev_transaction) = transactions.next_back() {
2131 if transaction.first_edit_at - prev_transaction.last_edit_at <= self.group_interval
2132 {
2133 transaction = prev_transaction;
2134 new_len -= 1;
2135 } else {
2136 break;
2137 }
2138 }
2139 }
2140
2141 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
2142 if let Some(last_transaction) = transactions_to_keep.last_mut() {
2143 if let Some(transaction) = transactions_to_merge.last() {
2144 last_transaction.last_edit_at = transaction.last_edit_at;
2145 }
2146 }
2147
2148 self.undo_stack.truncate(new_len);
2149 self.undo_stack.last().map(|t| t.id)
2150 }
2151}
2152
2153impl Excerpt {
2154 fn new(
2155 id: ExcerptId,
2156 buffer_id: usize,
2157 buffer: BufferSnapshot,
2158 range: Range<text::Anchor>,
2159 has_trailing_newline: bool,
2160 ) -> Self {
2161 Excerpt {
2162 id,
2163 max_buffer_row: range.end.to_point(&buffer).row,
2164 text_summary: buffer.text_summary_for_range::<TextSummary, _>(range.to_offset(&buffer)),
2165 buffer_id,
2166 buffer,
2167 range,
2168 has_trailing_newline,
2169 }
2170 }
2171
2172 fn chunks_in_range<'a>(
2173 &'a self,
2174 range: Range<usize>,
2175 language_aware: bool,
2176 ) -> ExcerptChunks<'a> {
2177 let content_start = self.range.start.to_offset(&self.buffer);
2178 let chunks_start = content_start + range.start;
2179 let chunks_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2180
2181 let footer_height = if self.has_trailing_newline
2182 && range.start <= self.text_summary.bytes
2183 && range.end > self.text_summary.bytes
2184 {
2185 1
2186 } else {
2187 0
2188 };
2189
2190 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
2191
2192 ExcerptChunks {
2193 content_chunks,
2194 footer_height,
2195 }
2196 }
2197
2198 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
2199 let content_start = self.range.start.to_offset(&self.buffer);
2200 let bytes_start = content_start + range.start;
2201 let bytes_end = content_start + cmp::min(range.end, self.text_summary.bytes);
2202 let footer_height = if self.has_trailing_newline
2203 && range.start <= self.text_summary.bytes
2204 && range.end > self.text_summary.bytes
2205 {
2206 1
2207 } else {
2208 0
2209 };
2210 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
2211
2212 ExcerptBytes {
2213 content_bytes,
2214 footer_height,
2215 }
2216 }
2217
2218 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
2219 if text_anchor
2220 .cmp(&self.range.start, &self.buffer)
2221 .unwrap()
2222 .is_lt()
2223 {
2224 self.range.start.clone()
2225 } else if text_anchor
2226 .cmp(&self.range.end, &self.buffer)
2227 .unwrap()
2228 .is_gt()
2229 {
2230 self.range.end.clone()
2231 } else {
2232 text_anchor
2233 }
2234 }
2235
2236 fn contains(&self, anchor: &Anchor) -> bool {
2237 self.buffer_id == anchor.buffer_id
2238 && self
2239 .range
2240 .start
2241 .cmp(&anchor.text_anchor, &self.buffer)
2242 .unwrap()
2243 .is_le()
2244 && self
2245 .range
2246 .end
2247 .cmp(&anchor.text_anchor, &self.buffer)
2248 .unwrap()
2249 .is_ge()
2250 }
2251}
2252
2253impl fmt::Debug for Excerpt {
2254 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2255 f.debug_struct("Excerpt")
2256 .field("id", &self.id)
2257 .field("buffer_id", &self.buffer_id)
2258 .field("range", &self.range)
2259 .field("text_summary", &self.text_summary)
2260 .field("has_trailing_newline", &self.has_trailing_newline)
2261 .finish()
2262 }
2263}
2264
2265impl sum_tree::Item for Excerpt {
2266 type Summary = ExcerptSummary;
2267
2268 fn summary(&self) -> Self::Summary {
2269 let mut text = self.text_summary.clone();
2270 if self.has_trailing_newline {
2271 text += TextSummary::from("\n");
2272 }
2273 ExcerptSummary {
2274 excerpt_id: self.id.clone(),
2275 max_buffer_row: self.max_buffer_row,
2276 text,
2277 }
2278 }
2279}
2280
2281impl sum_tree::Summary for ExcerptSummary {
2282 type Context = ();
2283
2284 fn add_summary(&mut self, summary: &Self, _: &()) {
2285 debug_assert!(summary.excerpt_id > self.excerpt_id);
2286 self.excerpt_id = summary.excerpt_id.clone();
2287 self.text.add_summary(&summary.text, &());
2288 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
2289 }
2290}
2291
2292impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
2293 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2294 *self += &summary.text;
2295 }
2296}
2297
2298impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
2299 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2300 *self += summary.text.bytes;
2301 }
2302}
2303
2304impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
2305 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2306 Ord::cmp(self, &cursor_location.text.bytes)
2307 }
2308}
2309
2310impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Option<&'a ExcerptId> {
2311 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
2312 Ord::cmp(self, &Some(&cursor_location.excerpt_id))
2313 }
2314}
2315
2316impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
2317 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2318 *self += summary.text.lines;
2319 }
2320}
2321
2322impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
2323 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2324 *self += summary.text.lines_utf16
2325 }
2326}
2327
2328impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a ExcerptId> {
2329 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
2330 *self = Some(&summary.excerpt_id);
2331 }
2332}
2333
2334impl<'a> MultiBufferRows<'a> {
2335 pub fn seek(&mut self, row: u32) {
2336 self.buffer_row_range = 0..0;
2337
2338 self.excerpts
2339 .seek_forward(&Point::new(row, 0), Bias::Right, &());
2340 if self.excerpts.item().is_none() {
2341 self.excerpts.prev(&());
2342
2343 if self.excerpts.item().is_none() && row == 0 {
2344 self.buffer_row_range = 0..1;
2345 return;
2346 }
2347 }
2348
2349 if let Some(excerpt) = self.excerpts.item() {
2350 let overshoot = row - self.excerpts.start().row;
2351 let excerpt_start = excerpt.range.start.to_point(&excerpt.buffer).row;
2352 self.buffer_row_range.start = excerpt_start + overshoot;
2353 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
2354 }
2355 }
2356}
2357
2358impl<'a> Iterator for MultiBufferRows<'a> {
2359 type Item = Option<u32>;
2360
2361 fn next(&mut self) -> Option<Self::Item> {
2362 loop {
2363 if !self.buffer_row_range.is_empty() {
2364 let row = Some(self.buffer_row_range.start);
2365 self.buffer_row_range.start += 1;
2366 return Some(row);
2367 }
2368 self.excerpts.item()?;
2369 self.excerpts.next(&());
2370 let excerpt = self.excerpts.item()?;
2371 self.buffer_row_range.start = excerpt.range.start.to_point(&excerpt.buffer).row;
2372 self.buffer_row_range.end =
2373 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
2374 }
2375 }
2376}
2377
2378impl<'a> MultiBufferChunks<'a> {
2379 pub fn offset(&self) -> usize {
2380 self.range.start
2381 }
2382
2383 pub fn seek(&mut self, offset: usize) {
2384 self.range.start = offset;
2385 self.excerpts.seek(&offset, Bias::Right, &());
2386 if let Some(excerpt) = self.excerpts.item() {
2387 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2388 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
2389 self.language_aware,
2390 ));
2391 } else {
2392 self.excerpt_chunks = None;
2393 }
2394 }
2395}
2396
2397impl<'a> Iterator for MultiBufferChunks<'a> {
2398 type Item = Chunk<'a>;
2399
2400 fn next(&mut self) -> Option<Self::Item> {
2401 if self.range.is_empty() {
2402 None
2403 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
2404 self.range.start += chunk.text.len();
2405 Some(chunk)
2406 } else {
2407 self.excerpts.next(&());
2408 let excerpt = self.excerpts.item()?;
2409 self.excerpt_chunks = Some(excerpt.chunks_in_range(
2410 0..self.range.end - self.excerpts.start(),
2411 self.language_aware,
2412 ));
2413 self.next()
2414 }
2415 }
2416}
2417
2418impl<'a> MultiBufferBytes<'a> {
2419 fn consume(&mut self, len: usize) {
2420 self.range.start += len;
2421 self.chunk = &self.chunk[len..];
2422
2423 if !self.range.is_empty() && self.chunk.is_empty() {
2424 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
2425 self.chunk = chunk;
2426 } else {
2427 self.excerpts.next(&());
2428 if let Some(excerpt) = self.excerpts.item() {
2429 let mut excerpt_bytes =
2430 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
2431 self.chunk = excerpt_bytes.next().unwrap();
2432 self.excerpt_bytes = Some(excerpt_bytes);
2433 }
2434 }
2435 }
2436 }
2437}
2438
2439impl<'a> Iterator for MultiBufferBytes<'a> {
2440 type Item = &'a [u8];
2441
2442 fn next(&mut self) -> Option<Self::Item> {
2443 let chunk = self.chunk;
2444 if chunk.is_empty() {
2445 None
2446 } else {
2447 self.consume(chunk.len());
2448 Some(chunk)
2449 }
2450 }
2451}
2452
2453impl<'a> io::Read for MultiBufferBytes<'a> {
2454 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
2455 let len = cmp::min(buf.len(), self.chunk.len());
2456 buf[..len].copy_from_slice(&self.chunk[..len]);
2457 if len > 0 {
2458 self.consume(len);
2459 }
2460 Ok(len)
2461 }
2462}
2463
2464impl<'a> Iterator for ExcerptBytes<'a> {
2465 type Item = &'a [u8];
2466
2467 fn next(&mut self) -> Option<Self::Item> {
2468 if let Some(chunk) = self.content_bytes.next() {
2469 if !chunk.is_empty() {
2470 return Some(chunk);
2471 }
2472 }
2473
2474 if self.footer_height > 0 {
2475 let result = &NEWLINES[..self.footer_height];
2476 self.footer_height = 0;
2477 return Some(result);
2478 }
2479
2480 None
2481 }
2482}
2483
2484impl<'a> Iterator for ExcerptChunks<'a> {
2485 type Item = Chunk<'a>;
2486
2487 fn next(&mut self) -> Option<Self::Item> {
2488 if let Some(chunk) = self.content_chunks.next() {
2489 return Some(chunk);
2490 }
2491
2492 if self.footer_height > 0 {
2493 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
2494 self.footer_height = 0;
2495 return Some(Chunk {
2496 text,
2497 ..Default::default()
2498 });
2499 }
2500
2501 None
2502 }
2503}
2504
2505impl ToOffset for Point {
2506 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2507 snapshot.point_to_offset(*self)
2508 }
2509}
2510
2511impl ToOffset for PointUtf16 {
2512 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2513 snapshot.point_utf16_to_offset(*self)
2514 }
2515}
2516
2517impl ToOffset for usize {
2518 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
2519 assert!(*self <= snapshot.len(), "offset is out of range");
2520 *self
2521 }
2522}
2523
2524impl ToPoint for usize {
2525 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
2526 snapshot.offset_to_point(*self)
2527 }
2528}
2529
2530impl ToPoint for Point {
2531 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
2532 *self
2533 }
2534}
2535
2536impl ToPointUtf16 for usize {
2537 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
2538 snapshot.offset_to_point_utf16(*self)
2539 }
2540}
2541
2542impl ToPointUtf16 for Point {
2543 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
2544 snapshot.point_to_point_utf16(*self)
2545 }
2546}
2547
2548impl ToPointUtf16 for PointUtf16 {
2549 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
2550 *self
2551 }
2552}
2553
2554pub fn char_kind(c: char) -> CharKind {
2555 if c == '\n' {
2556 CharKind::Newline
2557 } else if c.is_whitespace() {
2558 CharKind::Whitespace
2559 } else if c.is_alphanumeric() || c == '_' {
2560 CharKind::Word
2561 } else {
2562 CharKind::Punctuation
2563 }
2564}
2565
2566#[cfg(test)]
2567mod tests {
2568 use super::*;
2569 use gpui::MutableAppContext;
2570 use language::{Buffer, Rope};
2571 use rand::prelude::*;
2572 use std::env;
2573 use text::{Point, RandomCharIter};
2574 use util::test::sample_text;
2575
2576 #[gpui::test]
2577 fn test_singleton_multibuffer(cx: &mut MutableAppContext) {
2578 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2579 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2580
2581 let snapshot = multibuffer.read(cx).snapshot(cx);
2582 assert_eq!(snapshot.text(), buffer.read(cx).text());
2583
2584 assert_eq!(
2585 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2586 (0..buffer.read(cx).row_count())
2587 .map(Some)
2588 .collect::<Vec<_>>()
2589 );
2590
2591 buffer.update(cx, |buffer, cx| buffer.edit([1..3], "XXX\n", cx));
2592 let snapshot = multibuffer.read(cx).snapshot(cx);
2593
2594 assert_eq!(snapshot.text(), buffer.read(cx).text());
2595 assert_eq!(
2596 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2597 (0..buffer.read(cx).row_count())
2598 .map(Some)
2599 .collect::<Vec<_>>()
2600 );
2601 }
2602
2603 #[gpui::test]
2604 fn test_remote_multibuffer(cx: &mut MutableAppContext) {
2605 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
2606 let guest_buffer = cx.add_model(|cx| {
2607 let message = host_buffer.read(cx).to_proto();
2608 Buffer::from_proto(1, message, None, cx).unwrap()
2609 });
2610 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
2611 let snapshot = multibuffer.read(cx).snapshot(cx);
2612 assert_eq!(snapshot.text(), "a");
2613
2614 guest_buffer.update(cx, |buffer, cx| buffer.edit([1..1], "b", cx));
2615 let snapshot = multibuffer.read(cx).snapshot(cx);
2616 assert_eq!(snapshot.text(), "ab");
2617
2618 guest_buffer.update(cx, |buffer, cx| buffer.edit([2..2], "c", cx));
2619 let snapshot = multibuffer.read(cx).snapshot(cx);
2620 assert_eq!(snapshot.text(), "abc");
2621 }
2622
2623 #[gpui::test]
2624 fn test_excerpt_buffer(cx: &mut MutableAppContext) {
2625 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
2626 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
2627 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2628
2629 let subscription = multibuffer.update(cx, |multibuffer, cx| {
2630 let subscription = multibuffer.subscribe();
2631 multibuffer.push_excerpt(
2632 ExcerptProperties {
2633 buffer: &buffer_1,
2634 range: Point::new(1, 2)..Point::new(2, 5),
2635 },
2636 cx,
2637 );
2638 assert_eq!(
2639 subscription.consume().into_inner(),
2640 [Edit {
2641 old: 0..0,
2642 new: 0..10
2643 }]
2644 );
2645
2646 multibuffer.push_excerpt(
2647 ExcerptProperties {
2648 buffer: &buffer_1,
2649 range: Point::new(3, 3)..Point::new(4, 4),
2650 },
2651 cx,
2652 );
2653 multibuffer.push_excerpt(
2654 ExcerptProperties {
2655 buffer: &buffer_2,
2656 range: Point::new(3, 1)..Point::new(3, 3),
2657 },
2658 cx,
2659 );
2660 assert_eq!(
2661 subscription.consume().into_inner(),
2662 [Edit {
2663 old: 10..10,
2664 new: 10..22
2665 }]
2666 );
2667
2668 subscription
2669 });
2670
2671 let snapshot = multibuffer.read(cx).snapshot(cx);
2672 assert_eq!(
2673 snapshot.text(),
2674 concat!(
2675 "bbbb\n", // Preserve newlines
2676 "ccccc\n", //
2677 "ddd\n", //
2678 "eeee\n", //
2679 "jj" //
2680 )
2681 );
2682 assert_eq!(
2683 snapshot.buffer_rows(0).collect::<Vec<_>>(),
2684 [Some(1), Some(2), Some(3), Some(4), Some(3)]
2685 );
2686 assert_eq!(
2687 snapshot.buffer_rows(2).collect::<Vec<_>>(),
2688 [Some(3), Some(4), Some(3)]
2689 );
2690 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
2691 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
2692 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(1, 5)));
2693 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(2, 0)));
2694 assert!(snapshot.range_contains_excerpt_boundary(Point::new(1, 0)..Point::new(4, 0)));
2695 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(2, 0)..Point::new(3, 0)));
2696 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 0)..Point::new(4, 2)));
2697 assert!(!snapshot.range_contains_excerpt_boundary(Point::new(4, 2)..Point::new(4, 2)));
2698
2699 buffer_1.update(cx, |buffer, cx| {
2700 buffer.edit(
2701 [
2702 Point::new(0, 0)..Point::new(0, 0),
2703 Point::new(2, 1)..Point::new(2, 3),
2704 ],
2705 "\n",
2706 cx,
2707 );
2708 });
2709
2710 let snapshot = multibuffer.read(cx).snapshot(cx);
2711 assert_eq!(
2712 snapshot.text(),
2713 concat!(
2714 "bbbb\n", // Preserve newlines
2715 "c\n", //
2716 "cc\n", //
2717 "ddd\n", //
2718 "eeee\n", //
2719 "jj" //
2720 )
2721 );
2722
2723 assert_eq!(
2724 subscription.consume().into_inner(),
2725 [Edit {
2726 old: 6..8,
2727 new: 6..7
2728 }]
2729 );
2730
2731 let snapshot = multibuffer.read(cx).snapshot(cx);
2732 assert_eq!(
2733 snapshot.clip_point(Point::new(0, 5), Bias::Left),
2734 Point::new(0, 4)
2735 );
2736 assert_eq!(
2737 snapshot.clip_point(Point::new(0, 5), Bias::Right),
2738 Point::new(0, 4)
2739 );
2740 assert_eq!(
2741 snapshot.clip_point(Point::new(5, 1), Bias::Right),
2742 Point::new(5, 1)
2743 );
2744 assert_eq!(
2745 snapshot.clip_point(Point::new(5, 2), Bias::Right),
2746 Point::new(5, 2)
2747 );
2748 assert_eq!(
2749 snapshot.clip_point(Point::new(5, 3), Bias::Right),
2750 Point::new(5, 2)
2751 );
2752
2753 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
2754 let buffer_2_excerpt_id = multibuffer.excerpt_ids_for_buffer(&buffer_2)[0].clone();
2755 multibuffer.remove_excerpts(&[buffer_2_excerpt_id], cx);
2756 multibuffer.snapshot(cx)
2757 });
2758
2759 assert_eq!(
2760 snapshot.text(),
2761 concat!(
2762 "bbbb\n", // Preserve newlines
2763 "c\n", //
2764 "cc\n", //
2765 "ddd\n", //
2766 "eeee", //
2767 )
2768 );
2769 }
2770
2771 #[gpui::test]
2772 fn test_empty_excerpt_buffer(cx: &mut MutableAppContext) {
2773 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2774
2775 let snapshot = multibuffer.read(cx).snapshot(cx);
2776 assert_eq!(snapshot.text(), "");
2777 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
2778 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
2779 }
2780
2781 #[gpui::test]
2782 fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
2783 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2784 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
2785 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2786 buffer.update(cx, |buffer, cx| {
2787 buffer.edit([0..0], "X", cx);
2788 buffer.edit([5..5], "Y", cx);
2789 });
2790 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2791
2792 assert_eq!(old_snapshot.text(), "abcd");
2793 assert_eq!(new_snapshot.text(), "XabcdY");
2794
2795 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2796 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2797 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
2798 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
2799 }
2800
2801 #[gpui::test]
2802 fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
2803 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2804 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
2805 let multibuffer = cx.add_model(|cx| {
2806 let mut multibuffer = MultiBuffer::new(0);
2807 multibuffer.push_excerpt(
2808 ExcerptProperties {
2809 buffer: &buffer_1,
2810 range: 0..4,
2811 },
2812 cx,
2813 );
2814 multibuffer.push_excerpt(
2815 ExcerptProperties {
2816 buffer: &buffer_2,
2817 range: 0..5,
2818 },
2819 cx,
2820 );
2821 multibuffer
2822 });
2823 let old_snapshot = multibuffer.read(cx).snapshot(cx);
2824
2825 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
2826 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
2827 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2828 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
2829 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2830 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
2831
2832 buffer_1.update(cx, |buffer, cx| {
2833 buffer.edit([0..0], "W", cx);
2834 buffer.edit([5..5], "X", cx);
2835 });
2836 buffer_2.update(cx, |buffer, cx| {
2837 buffer.edit([0..0], "Y", cx);
2838 buffer.edit([6..0], "Z", cx);
2839 });
2840 let new_snapshot = multibuffer.read(cx).snapshot(cx);
2841
2842 assert_eq!(old_snapshot.text(), "abcd\nefghi");
2843 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
2844
2845 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
2846 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
2847 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
2848 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
2849 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
2850 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
2851 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
2852 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
2853 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
2854 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
2855 }
2856
2857 #[gpui::test]
2858 fn test_multibuffer_resolving_anchors_after_replacing_their_excerpts(
2859 cx: &mut MutableAppContext,
2860 ) {
2861 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
2862 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
2863 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2864
2865 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
2866 // Add an excerpt from buffer 1 that spans this new insertion.
2867 buffer_1.update(cx, |buffer, cx| buffer.edit([4..4], "123", cx));
2868 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
2869 multibuffer.push_excerpt(
2870 ExcerptProperties {
2871 buffer: &buffer_1,
2872 range: 0..7,
2873 },
2874 cx,
2875 )
2876 });
2877
2878 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
2879 assert_eq!(snapshot_1.text(), "abcd123");
2880
2881 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
2882 let (excerpt_id_2, excerpt_id_3, _) = multibuffer.update(cx, |multibuffer, cx| {
2883 multibuffer.remove_excerpts([&excerpt_id_1], cx);
2884 (
2885 multibuffer.push_excerpt(
2886 ExcerptProperties {
2887 buffer: &buffer_2,
2888 range: 0..4,
2889 },
2890 cx,
2891 ),
2892 multibuffer.push_excerpt(
2893 ExcerptProperties {
2894 buffer: &buffer_2,
2895 range: 6..10,
2896 },
2897 cx,
2898 ),
2899 multibuffer.push_excerpt(
2900 ExcerptProperties {
2901 buffer: &buffer_2,
2902 range: 12..16,
2903 },
2904 cx,
2905 ),
2906 )
2907 });
2908 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
2909 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
2910
2911 // The old excerpt id has been reused.
2912 assert_eq!(excerpt_id_2, excerpt_id_1);
2913
2914 // Resolve some anchors from the previous snapshot in the new snapshot.
2915 // Although there is still an excerpt with the same id, it is for
2916 // a different buffer, so we don't attempt to resolve the old text
2917 // anchor in the new buffer.
2918 assert_eq!(
2919 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
2920 0
2921 );
2922 assert_eq!(
2923 snapshot_2.summaries_for_anchors::<usize, _>(&[
2924 snapshot_1.anchor_before(2),
2925 snapshot_1.anchor_after(3)
2926 ]),
2927 vec![0, 0]
2928 );
2929 let refresh =
2930 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
2931 assert_eq!(
2932 refresh,
2933 &[
2934 (0, snapshot_2.anchor_before(0), false),
2935 (1, snapshot_2.anchor_after(0), false),
2936 ]
2937 );
2938
2939 // Replace the middle excerpt with a smaller excerpt in buffer 2,
2940 // that intersects the old excerpt.
2941 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
2942 multibuffer.remove_excerpts([&excerpt_id_3], cx);
2943 multibuffer.insert_excerpt_after(
2944 &excerpt_id_3,
2945 ExcerptProperties {
2946 buffer: &buffer_2,
2947 range: 5..8,
2948 },
2949 cx,
2950 )
2951 });
2952
2953 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
2954 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
2955 assert_ne!(excerpt_id_5, excerpt_id_3);
2956
2957 // Resolve some anchors from the previous snapshot in the new snapshot.
2958 // The anchor in the middle excerpt snaps to the beginning of the
2959 // excerpt, since it is not
2960 let anchors = [
2961 snapshot_2.anchor_before(0),
2962 snapshot_2.anchor_after(2),
2963 snapshot_2.anchor_after(6),
2964 snapshot_2.anchor_after(14),
2965 ];
2966 assert_eq!(
2967 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
2968 &[0, 2, 9, 13]
2969 );
2970
2971 let new_anchors = snapshot_3.refresh_anchors(&anchors);
2972 assert_eq!(
2973 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
2974 &[(0, true), (1, true), (2, true), (3, true)]
2975 );
2976 assert_eq!(
2977 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
2978 &[0, 2, 7, 13]
2979 );
2980 }
2981
2982 #[gpui::test(iterations = 100)]
2983 fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
2984 let operations = env::var("OPERATIONS")
2985 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
2986 .unwrap_or(10);
2987
2988 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
2989 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
2990 let mut excerpt_ids = Vec::new();
2991 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
2992 let mut anchors = Vec::new();
2993 let mut old_versions = Vec::new();
2994
2995 for _ in 0..operations {
2996 match rng.gen_range(0..100) {
2997 0..=19 if !buffers.is_empty() => {
2998 let buffer = buffers.choose(&mut rng).unwrap();
2999 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
3000 }
3001 20..=29 if !expected_excerpts.is_empty() => {
3002 let mut ids_to_remove = vec![];
3003 for _ in 0..rng.gen_range(1..=3) {
3004 if expected_excerpts.is_empty() {
3005 break;
3006 }
3007
3008 let ix = rng.gen_range(0..expected_excerpts.len());
3009 ids_to_remove.push(excerpt_ids.remove(ix));
3010 let (buffer, range) = expected_excerpts.remove(ix);
3011 let buffer = buffer.read(cx);
3012 log::info!(
3013 "Removing excerpt {}: {:?}",
3014 ix,
3015 buffer
3016 .text_for_range(range.to_offset(&buffer))
3017 .collect::<String>(),
3018 );
3019 }
3020 ids_to_remove.sort_unstable();
3021 multibuffer.update(cx, |multibuffer, cx| {
3022 multibuffer.remove_excerpts(&ids_to_remove, cx)
3023 });
3024 }
3025 30..=39 if !expected_excerpts.is_empty() => {
3026 let multibuffer = multibuffer.read(cx).read(cx);
3027 let offset =
3028 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
3029 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
3030 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
3031 anchors.push(multibuffer.anchor_at(offset, bias));
3032 anchors.sort_by(|a, b| a.cmp(&b, &multibuffer).unwrap());
3033 }
3034 40..=44 if !anchors.is_empty() => {
3035 let multibuffer = multibuffer.read(cx).read(cx);
3036
3037 anchors = multibuffer
3038 .refresh_anchors(&anchors)
3039 .into_iter()
3040 .map(|a| a.1)
3041 .collect();
3042
3043 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
3044 // overshoot its boundaries.
3045 let mut cursor = multibuffer.excerpts.cursor::<Option<&ExcerptId>>();
3046 for anchor in &anchors {
3047 if anchor.excerpt_id == ExcerptId::min()
3048 || anchor.excerpt_id == ExcerptId::max()
3049 {
3050 continue;
3051 }
3052
3053 cursor.seek_forward(&Some(&anchor.excerpt_id), Bias::Left, &());
3054 let excerpt = cursor.item().unwrap();
3055 assert_eq!(excerpt.id, anchor.excerpt_id);
3056 assert!(excerpt.contains(anchor));
3057 }
3058 }
3059 _ => {
3060 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
3061 let base_text = RandomCharIter::new(&mut rng).take(10).collect::<String>();
3062 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
3063 buffers.last().unwrap()
3064 } else {
3065 buffers.choose(&mut rng).unwrap()
3066 };
3067
3068 let buffer = buffer_handle.read(cx);
3069 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
3070 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3071 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
3072 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
3073 let prev_excerpt_id = excerpt_ids
3074 .get(prev_excerpt_ix)
3075 .cloned()
3076 .unwrap_or(ExcerptId::max());
3077 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
3078
3079 log::info!(
3080 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
3081 excerpt_ix,
3082 expected_excerpts.len(),
3083 buffer_handle.id(),
3084 buffer.text(),
3085 start_ix..end_ix,
3086 &buffer.text()[start_ix..end_ix]
3087 );
3088
3089 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
3090 multibuffer.insert_excerpt_after(
3091 &prev_excerpt_id,
3092 ExcerptProperties {
3093 buffer: &buffer_handle,
3094 range: start_ix..end_ix,
3095 },
3096 cx,
3097 )
3098 });
3099
3100 excerpt_ids.insert(excerpt_ix, excerpt_id);
3101 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
3102 }
3103 }
3104
3105 if rng.gen_bool(0.3) {
3106 multibuffer.update(cx, |multibuffer, cx| {
3107 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
3108 })
3109 }
3110
3111 let snapshot = multibuffer.read(cx).snapshot(cx);
3112
3113 let mut excerpt_starts = Vec::new();
3114 let mut expected_text = String::new();
3115 let mut expected_buffer_rows = Vec::new();
3116 for (buffer, range) in &expected_excerpts {
3117 let buffer = buffer.read(cx);
3118 let buffer_range = range.to_offset(buffer);
3119
3120 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
3121 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
3122 expected_text.push('\n');
3123
3124 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
3125 ..=buffer.offset_to_point(buffer_range.end).row;
3126 for row in buffer_row_range {
3127 expected_buffer_rows.push(Some(row));
3128 }
3129 }
3130 // Remove final trailing newline.
3131 if !expected_excerpts.is_empty() {
3132 expected_text.pop();
3133 }
3134
3135 // Always report one buffer row
3136 if expected_buffer_rows.is_empty() {
3137 expected_buffer_rows.push(Some(0));
3138 }
3139
3140 assert_eq!(snapshot.text(), expected_text);
3141 log::info!("MultiBuffer text: {:?}", expected_text);
3142
3143 assert_eq!(
3144 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3145 expected_buffer_rows,
3146 );
3147
3148 for _ in 0..5 {
3149 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
3150 assert_eq!(
3151 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
3152 &expected_buffer_rows[start_row..],
3153 "buffer_rows({})",
3154 start_row
3155 );
3156 }
3157
3158 assert_eq!(
3159 snapshot.max_buffer_row(),
3160 expected_buffer_rows
3161 .into_iter()
3162 .filter_map(|r| r)
3163 .max()
3164 .unwrap()
3165 );
3166
3167 let mut excerpt_starts = excerpt_starts.into_iter();
3168 for (buffer, range) in &expected_excerpts {
3169 let buffer_id = buffer.id();
3170 let buffer = buffer.read(cx);
3171 let buffer_range = range.to_offset(buffer);
3172 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
3173 let buffer_start_point_utf16 =
3174 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
3175
3176 let excerpt_start = excerpt_starts.next().unwrap();
3177 let mut offset = excerpt_start.bytes;
3178 let mut buffer_offset = buffer_range.start;
3179 let mut point = excerpt_start.lines;
3180 let mut buffer_point = buffer_start_point;
3181 let mut point_utf16 = excerpt_start.lines_utf16;
3182 let mut buffer_point_utf16 = buffer_start_point_utf16;
3183 for ch in buffer
3184 .snapshot()
3185 .chunks(buffer_range.clone(), false)
3186 .flat_map(|c| c.text.chars())
3187 {
3188 for _ in 0..ch.len_utf8() {
3189 let left_offset = snapshot.clip_offset(offset, Bias::Left);
3190 let right_offset = snapshot.clip_offset(offset, Bias::Right);
3191 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
3192 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
3193 assert_eq!(
3194 left_offset,
3195 excerpt_start.bytes + (buffer_left_offset - buffer_range.start),
3196 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
3197 offset,
3198 buffer_id,
3199 buffer_offset,
3200 );
3201 assert_eq!(
3202 right_offset,
3203 excerpt_start.bytes + (buffer_right_offset - buffer_range.start),
3204 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
3205 offset,
3206 buffer_id,
3207 buffer_offset,
3208 );
3209
3210 let left_point = snapshot.clip_point(point, Bias::Left);
3211 let right_point = snapshot.clip_point(point, Bias::Right);
3212 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
3213 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
3214 assert_eq!(
3215 left_point,
3216 excerpt_start.lines + (buffer_left_point - buffer_start_point),
3217 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
3218 point,
3219 buffer_id,
3220 buffer_point,
3221 );
3222 assert_eq!(
3223 right_point,
3224 excerpt_start.lines + (buffer_right_point - buffer_start_point),
3225 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
3226 point,
3227 buffer_id,
3228 buffer_point,
3229 );
3230
3231 assert_eq!(
3232 snapshot.point_to_offset(left_point),
3233 left_offset,
3234 "point_to_offset({:?})",
3235 left_point,
3236 );
3237 assert_eq!(
3238 snapshot.offset_to_point(left_offset),
3239 left_point,
3240 "offset_to_point({:?})",
3241 left_offset,
3242 );
3243
3244 offset += 1;
3245 buffer_offset += 1;
3246 if ch == '\n' {
3247 point += Point::new(1, 0);
3248 buffer_point += Point::new(1, 0);
3249 } else {
3250 point += Point::new(0, 1);
3251 buffer_point += Point::new(0, 1);
3252 }
3253 }
3254
3255 for _ in 0..ch.len_utf16() {
3256 let left_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Left);
3257 let right_point_utf16 = snapshot.clip_point_utf16(point_utf16, Bias::Right);
3258 let buffer_left_point_utf16 =
3259 buffer.clip_point_utf16(buffer_point_utf16, Bias::Left);
3260 let buffer_right_point_utf16 =
3261 buffer.clip_point_utf16(buffer_point_utf16, Bias::Right);
3262 assert_eq!(
3263 left_point_utf16,
3264 excerpt_start.lines_utf16
3265 + (buffer_left_point_utf16 - buffer_start_point_utf16),
3266 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
3267 point_utf16,
3268 buffer_id,
3269 buffer_point_utf16,
3270 );
3271 assert_eq!(
3272 right_point_utf16,
3273 excerpt_start.lines_utf16
3274 + (buffer_right_point_utf16 - buffer_start_point_utf16),
3275 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
3276 point_utf16,
3277 buffer_id,
3278 buffer_point_utf16,
3279 );
3280
3281 if ch == '\n' {
3282 point_utf16 += PointUtf16::new(1, 0);
3283 buffer_point_utf16 += PointUtf16::new(1, 0);
3284 } else {
3285 point_utf16 += PointUtf16::new(0, 1);
3286 buffer_point_utf16 += PointUtf16::new(0, 1);
3287 }
3288 }
3289 }
3290 }
3291
3292 for (row, line) in expected_text.split('\n').enumerate() {
3293 assert_eq!(
3294 snapshot.line_len(row as u32),
3295 line.len() as u32,
3296 "line_len({}).",
3297 row
3298 );
3299 }
3300
3301 let text_rope = Rope::from(expected_text.as_str());
3302 for _ in 0..10 {
3303 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3304 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3305
3306 let text_for_range = snapshot
3307 .text_for_range(start_ix..end_ix)
3308 .collect::<String>();
3309 assert_eq!(
3310 text_for_range,
3311 &expected_text[start_ix..end_ix],
3312 "incorrect text for range {:?}",
3313 start_ix..end_ix
3314 );
3315
3316 let excerpted_buffer_ranges =
3317 multibuffer.read(cx).excerpted_buffers(start_ix..end_ix, cx);
3318 let excerpted_buffers_text = excerpted_buffer_ranges
3319 .into_iter()
3320 .map(|(buffer, buffer_range)| {
3321 buffer
3322 .read(cx)
3323 .text_for_range(buffer_range)
3324 .collect::<String>()
3325 })
3326 .collect::<Vec<_>>()
3327 .join("\n");
3328 assert_eq!(excerpted_buffers_text, text_for_range);
3329
3330 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
3331 assert_eq!(
3332 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
3333 expected_summary,
3334 "incorrect summary for range {:?}",
3335 start_ix..end_ix
3336 );
3337 }
3338
3339 // Anchor resolution
3340 for (anchor, resolved_offset) in anchors
3341 .iter()
3342 .zip(snapshot.summaries_for_anchors::<usize, _>(&anchors))
3343 {
3344 assert!(resolved_offset <= snapshot.len());
3345 assert_eq!(
3346 snapshot.summary_for_anchor::<usize>(anchor),
3347 resolved_offset
3348 );
3349 }
3350
3351 for _ in 0..10 {
3352 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
3353 assert_eq!(
3354 snapshot.reversed_chars_at(end_ix).collect::<String>(),
3355 expected_text[..end_ix].chars().rev().collect::<String>(),
3356 );
3357 }
3358
3359 for _ in 0..10 {
3360 let end_ix = rng.gen_range(0..=text_rope.len());
3361 let start_ix = rng.gen_range(0..=end_ix);
3362 assert_eq!(
3363 snapshot
3364 .bytes_in_range(start_ix..end_ix)
3365 .flatten()
3366 .copied()
3367 .collect::<Vec<_>>(),
3368 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
3369 "bytes_in_range({:?})",
3370 start_ix..end_ix,
3371 );
3372 }
3373 }
3374
3375 let snapshot = multibuffer.read(cx).snapshot(cx);
3376 for (old_snapshot, subscription) in old_versions {
3377 let edits = subscription.consume().into_inner();
3378
3379 log::info!(
3380 "applying subscription edits to old text: {:?}: {:?}",
3381 old_snapshot.text(),
3382 edits,
3383 );
3384
3385 let mut text = old_snapshot.text();
3386 for edit in edits {
3387 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
3388 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
3389 }
3390 assert_eq!(text.to_string(), snapshot.text());
3391 }
3392 }
3393
3394 #[gpui::test]
3395 fn test_history(cx: &mut MutableAppContext) {
3396 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
3397 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
3398 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3399 let group_interval = multibuffer.read(cx).history.group_interval;
3400 multibuffer.update(cx, |multibuffer, cx| {
3401 multibuffer.push_excerpt(
3402 ExcerptProperties {
3403 buffer: &buffer_1,
3404 range: 0..buffer_1.read(cx).len(),
3405 },
3406 cx,
3407 );
3408 multibuffer.push_excerpt(
3409 ExcerptProperties {
3410 buffer: &buffer_2,
3411 range: 0..buffer_2.read(cx).len(),
3412 },
3413 cx,
3414 );
3415 });
3416
3417 let mut now = Instant::now();
3418
3419 multibuffer.update(cx, |multibuffer, cx| {
3420 multibuffer.start_transaction_at(now, cx);
3421 multibuffer.edit(
3422 [
3423 Point::new(0, 0)..Point::new(0, 0),
3424 Point::new(1, 0)..Point::new(1, 0),
3425 ],
3426 "A",
3427 cx,
3428 );
3429 multibuffer.edit(
3430 [
3431 Point::new(0, 1)..Point::new(0, 1),
3432 Point::new(1, 1)..Point::new(1, 1),
3433 ],
3434 "B",
3435 cx,
3436 );
3437 multibuffer.end_transaction_at(now, cx);
3438 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3439
3440 now += 2 * group_interval;
3441 multibuffer.start_transaction_at(now, cx);
3442 multibuffer.edit([2..2], "C", cx);
3443 multibuffer.end_transaction_at(now, cx);
3444 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3445
3446 multibuffer.undo(cx);
3447 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3448
3449 multibuffer.undo(cx);
3450 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3451
3452 multibuffer.redo(cx);
3453 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3454
3455 multibuffer.redo(cx);
3456 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3457
3458 buffer_1.update(cx, |buffer_1, cx| buffer_1.undo(cx));
3459 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3460
3461 multibuffer.undo(cx);
3462 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
3463
3464 multibuffer.redo(cx);
3465 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3466
3467 multibuffer.redo(cx);
3468 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3469
3470 multibuffer.undo(cx);
3471 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
3472
3473 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
3474 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
3475
3476 multibuffer.undo(cx);
3477 assert_eq!(multibuffer.read(cx).text(), "C1234\n5678");
3478 });
3479 }
3480}