1mod anchor;
2#[cfg(test)]
3mod multi_buffer_tests;
4mod position;
5
6pub use anchor::{Anchor, AnchorRangeExt, Offset};
7pub use position::{TypedOffset, TypedPoint, TypedRow};
8
9use anyhow::{Result, anyhow};
10use buffer_diff::{
11 BufferDiff, BufferDiffEvent, BufferDiffSnapshot, DiffHunkSecondaryStatus, DiffHunkStatus,
12 DiffHunkStatusKind,
13};
14use clock::ReplicaId;
15use collections::{BTreeMap, Bound, HashMap, HashSet};
16use gpui::{App, AppContext as _, Context, Entity, EntityId, EventEmitter, Task};
17use itertools::Itertools;
18use language::{
19 AutoindentMode, Buffer, BufferChunks, BufferRow, BufferSnapshot, Capability, CharClassifier,
20 CharKind, Chunk, CursorShape, DiagnosticEntry, DiskState, File, IndentSize, Language,
21 LanguageScope, OffsetRangeExt, OffsetUtf16, Outline, OutlineItem, Point, PointUtf16, Selection,
22 TextDimension, TextObject, ToOffset as _, ToPoint as _, TransactionId, TreeSitterOptions,
23 Unclipped,
24 language_settings::{IndentGuideSettings, LanguageSettings, language_settings},
25};
26
27use rope::DimensionPair;
28use smallvec::SmallVec;
29use smol::future::yield_now;
30use std::{
31 any::type_name,
32 borrow::Cow,
33 cell::{Cell, Ref, RefCell},
34 cmp, fmt,
35 future::Future,
36 io,
37 iter::{self, FromIterator},
38 mem,
39 ops::{Range, RangeBounds, Sub},
40 path::{Path, PathBuf},
41 rc::Rc,
42 str,
43 sync::Arc,
44 time::{Duration, Instant},
45};
46use sum_tree::{Bias, Cursor, Dimension, SumTree, Summary, TreeMap};
47use text::{
48 BufferId, Edit, LineIndent, TextSummary,
49 locator::Locator,
50 subscription::{Subscription, Topic},
51};
52use theme::SyntaxTheme;
53use util::post_inc;
54
55const NEWLINES: &[u8] = &[b'\n'; u8::MAX as usize];
56
57#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
58pub struct ExcerptId(usize);
59
60/// One or more [`Buffers`](Buffer) being edited in a single view.
61///
62/// See <https://zed.dev/features#multi-buffers>
63pub struct MultiBuffer {
64 /// A snapshot of the [`Excerpt`]s in the MultiBuffer.
65 /// Use [`MultiBuffer::snapshot`] to get a up-to-date snapshot.
66 snapshot: RefCell<MultiBufferSnapshot>,
67 /// Contains the state of the buffers being edited
68 buffers: RefCell<HashMap<BufferId, BufferState>>,
69 // only used by consumers using `set_excerpts_for_buffer`
70 excerpts_by_path: BTreeMap<PathKey, Vec<ExcerptId>>,
71 paths_by_excerpt: HashMap<ExcerptId, PathKey>,
72 diffs: HashMap<BufferId, DiffState>,
73 // all_diff_hunks_expanded: bool,
74 subscriptions: Topic,
75 /// If true, the multi-buffer only contains a single [`Buffer`] and a single [`Excerpt`]
76 singleton: bool,
77 history: History,
78 title: Option<String>,
79 capability: Capability,
80 buffer_changed_since_sync: Rc<Cell<bool>>,
81}
82
83#[derive(Clone, Debug, PartialEq, Eq)]
84pub enum MultiOrSingleBufferOffsetRange {
85 Single(Range<usize>),
86 Multi(Range<usize>),
87}
88
89#[derive(Clone, Debug, PartialEq, Eq)]
90pub enum Event {
91 ExcerptsAdded {
92 buffer: Entity<Buffer>,
93 predecessor: ExcerptId,
94 excerpts: Vec<(ExcerptId, ExcerptRange<language::Anchor>)>,
95 },
96 ExcerptsRemoved {
97 ids: Vec<ExcerptId>,
98 removed_buffer_ids: Vec<BufferId>,
99 },
100 ExcerptsExpanded {
101 ids: Vec<ExcerptId>,
102 },
103 ExcerptsEdited {
104 excerpt_ids: Vec<ExcerptId>,
105 buffer_ids: Vec<BufferId>,
106 },
107 DiffHunksToggled,
108 Edited {
109 singleton_buffer_edited: bool,
110 edited_buffer: Option<Entity<Buffer>>,
111 },
112 TransactionUndone {
113 transaction_id: TransactionId,
114 },
115 Reloaded,
116 ReloadNeeded,
117
118 LanguageChanged(BufferId),
119 CapabilityChanged,
120 Reparsed(BufferId),
121 Saved,
122 FileHandleChanged,
123 Closed,
124 Discarded,
125 DirtyChanged,
126 DiagnosticsUpdated,
127 BufferDiffChanged,
128}
129
130/// A diff hunk, representing a range of consequent lines in a multibuffer.
131#[derive(Debug, Clone, PartialEq, Eq)]
132pub struct MultiBufferDiffHunk {
133 /// The row range in the multibuffer where this diff hunk appears.
134 pub row_range: Range<MultiBufferRow>,
135 /// The buffer ID that this hunk belongs to.
136 pub buffer_id: BufferId,
137 /// The range of the underlying buffer that this hunk corresponds to.
138 pub buffer_range: Range<text::Anchor>,
139 /// The excerpt that contains the diff hunk.
140 pub excerpt_id: ExcerptId,
141 /// The range within the buffer's diff base that this hunk corresponds to.
142 pub diff_base_byte_range: Range<usize>,
143 /// Whether or not this hunk also appears in the 'secondary diff'.
144 pub secondary_status: DiffHunkSecondaryStatus,
145}
146
147impl MultiBufferDiffHunk {
148 pub fn status(&self) -> DiffHunkStatus {
149 let kind = if self.buffer_range.start == self.buffer_range.end {
150 DiffHunkStatusKind::Deleted
151 } else if self.diff_base_byte_range.is_empty() {
152 DiffHunkStatusKind::Added
153 } else {
154 DiffHunkStatusKind::Modified
155 };
156 DiffHunkStatus {
157 kind,
158 secondary: self.secondary_status,
159 }
160 }
161
162 pub fn is_created_file(&self) -> bool {
163 self.diff_base_byte_range == (0..0)
164 && self.buffer_range == (text::Anchor::MIN..text::Anchor::MAX)
165 }
166
167 pub fn multi_buffer_range(&self) -> Range<Anchor> {
168 let start = Anchor::in_buffer(self.excerpt_id, self.buffer_id, self.buffer_range.start);
169 let end = Anchor::in_buffer(self.excerpt_id, self.buffer_id, self.buffer_range.end);
170 start..end
171 }
172}
173
174#[derive(PartialEq, Eq, Ord, PartialOrd, Clone, Hash, Debug)]
175pub struct PathKey {
176 namespace: u32,
177 path: Arc<Path>,
178}
179
180impl PathKey {
181 pub fn namespaced(namespace: u32, path: Arc<Path>) -> Self {
182 Self { namespace, path }
183 }
184
185 pub fn for_buffer(buffer: &Entity<Buffer>, cx: &App) -> Self {
186 if let Some(file) = buffer.read(cx).file() {
187 Self::namespaced(1, Arc::from(file.full_path(cx)))
188 } else {
189 Self::namespaced(0, Arc::from(PathBuf::from(buffer.entity_id().to_string())))
190 }
191 }
192
193 pub fn path(&self) -> &Arc<Path> {
194 &self.path
195 }
196}
197
198pub type MultiBufferPoint = Point;
199type ExcerptOffset = TypedOffset<Excerpt>;
200type ExcerptPoint = TypedPoint<Excerpt>;
201
202#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
203#[serde(transparent)]
204pub struct MultiBufferRow(pub u32);
205
206impl MultiBufferRow {
207 pub const MIN: Self = Self(0);
208 pub const MAX: Self = Self(u32::MAX);
209}
210
211impl std::ops::Add<usize> for MultiBufferRow {
212 type Output = Self;
213
214 fn add(self, rhs: usize) -> Self::Output {
215 MultiBufferRow(self.0 + rhs as u32)
216 }
217}
218
219#[derive(Clone)]
220struct History {
221 next_transaction_id: TransactionId,
222 undo_stack: Vec<Transaction>,
223 redo_stack: Vec<Transaction>,
224 transaction_depth: usize,
225 group_interval: Duration,
226}
227
228#[derive(Clone)]
229struct Transaction {
230 id: TransactionId,
231 buffer_transactions: HashMap<BufferId, text::TransactionId>,
232 first_edit_at: Instant,
233 last_edit_at: Instant,
234 suppress_grouping: bool,
235}
236
237pub trait ToOffset: 'static + fmt::Debug {
238 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
239}
240
241pub trait ToOffsetUtf16: 'static + fmt::Debug {
242 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16;
243}
244
245pub trait ToPoint: 'static + fmt::Debug {
246 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
247}
248
249pub trait ToPointUtf16: 'static + fmt::Debug {
250 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
251}
252
253struct BufferState {
254 buffer: Entity<Buffer>,
255 last_version: clock::Global,
256 last_non_text_state_update_count: usize,
257 excerpts: Vec<Locator>,
258 _subscriptions: [gpui::Subscription; 2],
259}
260
261struct DiffState {
262 diff: Entity<BufferDiff>,
263 _subscription: gpui::Subscription,
264}
265
266impl DiffState {
267 fn new(diff: Entity<BufferDiff>, cx: &mut Context<MultiBuffer>) -> Self {
268 DiffState {
269 _subscription: cx.subscribe(&diff, |this, diff, event, cx| match event {
270 BufferDiffEvent::DiffChanged { changed_range } => {
271 if let Some(changed_range) = changed_range.clone() {
272 this.buffer_diff_changed(diff, changed_range, cx)
273 }
274 cx.emit(Event::BufferDiffChanged);
275 }
276 BufferDiffEvent::LanguageChanged => this.buffer_diff_language_changed(diff, cx),
277 _ => {}
278 }),
279 diff,
280 }
281 }
282}
283
284/// The contents of a [`MultiBuffer`] at a single point in time.
285#[derive(Clone, Default)]
286pub struct MultiBufferSnapshot {
287 singleton: bool,
288 excerpts: SumTree<Excerpt>,
289 excerpt_ids: SumTree<ExcerptIdMapping>,
290 diffs: TreeMap<BufferId, BufferDiffSnapshot>,
291 diff_transforms: SumTree<DiffTransform>,
292 replaced_excerpts: TreeMap<ExcerptId, ExcerptId>,
293 trailing_excerpt_update_count: usize,
294 all_diff_hunks_expanded: bool,
295 non_text_state_update_count: usize,
296 edit_count: usize,
297 is_dirty: bool,
298 has_deleted_file: bool,
299 has_conflict: bool,
300 show_headers: bool,
301}
302
303#[derive(Debug, Clone)]
304enum DiffTransform {
305 BufferContent {
306 summary: TextSummary,
307 inserted_hunk_info: Option<DiffTransformHunkInfo>,
308 },
309 DeletedHunk {
310 summary: TextSummary,
311 buffer_id: BufferId,
312 hunk_info: DiffTransformHunkInfo,
313 base_text_byte_range: Range<usize>,
314 has_trailing_newline: bool,
315 },
316}
317
318#[derive(Clone, Copy, Debug)]
319struct DiffTransformHunkInfo {
320 excerpt_id: ExcerptId,
321 hunk_start_anchor: text::Anchor,
322 hunk_secondary_status: DiffHunkSecondaryStatus,
323}
324
325impl Eq for DiffTransformHunkInfo {}
326
327impl PartialEq for DiffTransformHunkInfo {
328 fn eq(&self, other: &DiffTransformHunkInfo) -> bool {
329 self.excerpt_id == other.excerpt_id && self.hunk_start_anchor == other.hunk_start_anchor
330 }
331}
332
333impl std::hash::Hash for DiffTransformHunkInfo {
334 fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
335 self.excerpt_id.hash(state);
336 self.hunk_start_anchor.hash(state);
337 }
338}
339
340#[derive(Clone)]
341pub struct ExcerptInfo {
342 pub id: ExcerptId,
343 pub buffer: BufferSnapshot,
344 pub buffer_id: BufferId,
345 pub range: ExcerptRange<text::Anchor>,
346 pub end_row: MultiBufferRow,
347}
348
349impl std::fmt::Debug for ExcerptInfo {
350 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
351 f.debug_struct(type_name::<Self>())
352 .field("id", &self.id)
353 .field("buffer_id", &self.buffer_id)
354 .field("path", &self.buffer.file().map(|f| f.path()))
355 .field("range", &self.range)
356 .finish()
357 }
358}
359
360/// A boundary between `Excerpt`s in a [`MultiBuffer`]
361#[derive(Debug)]
362pub struct ExcerptBoundary {
363 pub prev: Option<ExcerptInfo>,
364 pub next: ExcerptInfo,
365 /// The row in the `MultiBuffer` where the boundary is located
366 pub row: MultiBufferRow,
367}
368
369impl ExcerptBoundary {
370 pub fn starts_new_buffer(&self) -> bool {
371 match (self.prev.as_ref(), &self.next) {
372 (None, _) => true,
373 (Some(prev), next) => prev.buffer_id != next.buffer_id,
374 }
375 }
376}
377
378#[derive(Copy, Clone, Debug, PartialEq, Eq)]
379pub struct ExpandInfo {
380 pub direction: ExpandExcerptDirection,
381 pub excerpt_id: ExcerptId,
382}
383
384#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
385pub struct RowInfo {
386 pub buffer_id: Option<BufferId>,
387 pub buffer_row: Option<u32>,
388 pub multibuffer_row: Option<MultiBufferRow>,
389 pub diff_status: Option<buffer_diff::DiffHunkStatus>,
390 pub expand_info: Option<ExpandInfo>,
391}
392
393/// A slice into a [`Buffer`] that is being edited in a [`MultiBuffer`].
394#[derive(Clone)]
395struct Excerpt {
396 /// The unique identifier for this excerpt
397 id: ExcerptId,
398 /// The location of the excerpt in the [`MultiBuffer`]
399 locator: Locator,
400 /// The buffer being excerpted
401 buffer_id: BufferId,
402 /// A snapshot of the buffer being excerpted
403 buffer: BufferSnapshot,
404 /// The range of the buffer to be shown in the excerpt
405 range: ExcerptRange<text::Anchor>,
406 /// The last row in the excerpted slice of the buffer
407 max_buffer_row: BufferRow,
408 /// A summary of the text in the excerpt
409 text_summary: TextSummary,
410 has_trailing_newline: bool,
411}
412
413/// A public view into an `Excerpt` in a [`MultiBuffer`].
414///
415/// Contains methods for getting the [`Buffer`] of the excerpt,
416/// as well as mapping offsets to/from buffer and multibuffer coordinates.
417#[derive(Clone)]
418pub struct MultiBufferExcerpt<'a> {
419 excerpt: &'a Excerpt,
420 diff_transforms: sum_tree::Cursor<'a, DiffTransform, DiffTransforms<usize>>,
421 offset: usize,
422 excerpt_offset: ExcerptDimension<usize>,
423 buffer_offset: usize,
424}
425
426#[derive(Clone, Debug)]
427struct ExcerptIdMapping {
428 id: ExcerptId,
429 locator: Locator,
430}
431
432/// A range of text from a single [`Buffer`], to be shown as an `Excerpt`.
433/// These ranges are relative to the buffer itself
434#[derive(Clone, Debug, Eq, PartialEq, Hash)]
435pub struct ExcerptRange<T> {
436 /// The full range of text to be shown in the excerpt.
437 pub context: Range<T>,
438 /// The primary range of text to be highlighted in the excerpt.
439 /// In a multi-buffer search, this would be the text that matched the search
440 pub primary: Range<T>,
441}
442
443impl<T: Clone> ExcerptRange<T> {
444 pub fn new(context: Range<T>) -> Self {
445 Self {
446 context: context.clone(),
447 primary: context,
448 }
449 }
450}
451
452#[derive(Clone, Debug, Default)]
453pub struct ExcerptSummary {
454 excerpt_id: ExcerptId,
455 /// The location of the last [`Excerpt`] being summarized
456 excerpt_locator: Locator,
457 widest_line_number: u32,
458 text: TextSummary,
459}
460
461#[derive(Debug, Clone)]
462pub struct DiffTransformSummary {
463 input: TextSummary,
464 output: TextSummary,
465}
466
467#[derive(Clone)]
468pub struct MultiBufferRows<'a> {
469 point: Point,
470 is_empty: bool,
471 is_singleton: bool,
472 cursor: MultiBufferCursor<'a, Point>,
473}
474
475pub struct MultiBufferChunks<'a> {
476 excerpts: Cursor<'a, Excerpt, ExcerptOffset>,
477 diff_transforms: Cursor<'a, DiffTransform, (usize, ExcerptOffset)>,
478 diffs: &'a TreeMap<BufferId, BufferDiffSnapshot>,
479 diff_base_chunks: Option<(BufferId, BufferChunks<'a>)>,
480 buffer_chunk: Option<Chunk<'a>>,
481 range: Range<usize>,
482 excerpt_offset_range: Range<ExcerptOffset>,
483 excerpt_chunks: Option<ExcerptChunks<'a>>,
484 language_aware: bool,
485}
486
487pub struct ReversedMultiBufferChunks<'a> {
488 cursor: MultiBufferCursor<'a, usize>,
489 current_chunks: Option<rope::Chunks<'a>>,
490 start: usize,
491 offset: usize,
492}
493
494pub struct MultiBufferBytes<'a> {
495 range: Range<usize>,
496 cursor: MultiBufferCursor<'a, usize>,
497 excerpt_bytes: Option<text::Bytes<'a>>,
498 has_trailing_newline: bool,
499 chunk: &'a [u8],
500}
501
502pub struct ReversedMultiBufferBytes<'a> {
503 range: Range<usize>,
504 chunks: ReversedMultiBufferChunks<'a>,
505 chunk: &'a [u8],
506}
507
508#[derive(Clone)]
509struct DiffTransforms<D> {
510 output_dimension: OutputDimension<D>,
511 excerpt_dimension: ExcerptDimension<D>,
512}
513
514impl<'a, D: TextDimension> Dimension<'a, DiffTransformSummary> for DiffTransforms<D> {
515 fn zero(cx: &<DiffTransformSummary as sum_tree::Summary>::Context) -> Self {
516 Self {
517 output_dimension: OutputDimension::zero(cx),
518 excerpt_dimension: <ExcerptDimension<D> as Dimension<'a, DiffTransformSummary>>::zero(
519 cx,
520 ),
521 }
522 }
523
524 fn add_summary(
525 &mut self,
526 summary: &'a DiffTransformSummary,
527 cx: &<DiffTransformSummary as sum_tree::Summary>::Context,
528 ) {
529 self.output_dimension.add_summary(summary, cx);
530 self.excerpt_dimension.add_summary(summary, cx);
531 }
532}
533
534#[derive(Clone)]
535struct MultiBufferCursor<'a, D: TextDimension> {
536 excerpts: Cursor<'a, Excerpt, ExcerptDimension<D>>,
537 diff_transforms: Cursor<'a, DiffTransform, DiffTransforms<D>>,
538 diffs: &'a TreeMap<BufferId, BufferDiffSnapshot>,
539 cached_region: Option<MultiBufferRegion<'a, D>>,
540}
541
542#[derive(Clone)]
543struct MultiBufferRegion<'a, D: TextDimension> {
544 buffer: &'a BufferSnapshot,
545 is_main_buffer: bool,
546 diff_hunk_status: Option<DiffHunkStatus>,
547 excerpt: &'a Excerpt,
548 buffer_range: Range<D>,
549 range: Range<D>,
550 has_trailing_newline: bool,
551}
552
553struct ExcerptChunks<'a> {
554 excerpt_id: ExcerptId,
555 content_chunks: BufferChunks<'a>,
556 footer_height: usize,
557}
558
559#[derive(Debug)]
560struct BufferEdit {
561 range: Range<usize>,
562 new_text: Arc<str>,
563 is_insertion: bool,
564 original_indent_column: Option<u32>,
565 excerpt_id: ExcerptId,
566}
567
568#[derive(Clone, Copy, Debug, PartialEq)]
569enum DiffChangeKind {
570 BufferEdited,
571 DiffUpdated { base_changed: bool },
572 ExpandOrCollapseHunks { expand: bool },
573}
574
575#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
576pub enum ExpandExcerptDirection {
577 Up,
578 Down,
579 UpAndDown,
580}
581
582impl ExpandExcerptDirection {
583 pub fn should_expand_up(&self) -> bool {
584 match self {
585 ExpandExcerptDirection::Up => true,
586 ExpandExcerptDirection::Down => false,
587 ExpandExcerptDirection::UpAndDown => true,
588 }
589 }
590
591 pub fn should_expand_down(&self) -> bool {
592 match self {
593 ExpandExcerptDirection::Up => false,
594 ExpandExcerptDirection::Down => true,
595 ExpandExcerptDirection::UpAndDown => true,
596 }
597 }
598}
599
600#[derive(Clone, Debug, PartialEq)]
601pub struct IndentGuide {
602 pub buffer_id: BufferId,
603 pub start_row: MultiBufferRow,
604 pub end_row: MultiBufferRow,
605 pub depth: u32,
606 pub tab_size: u32,
607 pub settings: IndentGuideSettings,
608}
609
610impl IndentGuide {
611 pub fn indent_level(&self) -> u32 {
612 self.depth * self.tab_size
613 }
614}
615
616impl MultiBuffer {
617 pub fn new(capability: Capability) -> Self {
618 Self {
619 snapshot: RefCell::new(MultiBufferSnapshot {
620 show_headers: true,
621 ..MultiBufferSnapshot::default()
622 }),
623 buffers: RefCell::default(),
624 diffs: HashMap::default(),
625 subscriptions: Topic::default(),
626 singleton: false,
627 capability,
628 title: None,
629 excerpts_by_path: Default::default(),
630 paths_by_excerpt: Default::default(),
631 buffer_changed_since_sync: Default::default(),
632 history: History {
633 next_transaction_id: clock::Lamport::default(),
634 undo_stack: Vec::new(),
635 redo_stack: Vec::new(),
636 transaction_depth: 0,
637 group_interval: Duration::from_millis(300),
638 },
639 }
640 }
641
642 pub fn without_headers(capability: Capability) -> Self {
643 Self {
644 snapshot: Default::default(),
645 buffers: Default::default(),
646 excerpts_by_path: Default::default(),
647 paths_by_excerpt: Default::default(),
648 diffs: HashMap::default(),
649 subscriptions: Default::default(),
650 singleton: false,
651 capability,
652 buffer_changed_since_sync: Default::default(),
653 history: History {
654 next_transaction_id: Default::default(),
655 undo_stack: Default::default(),
656 redo_stack: Default::default(),
657 transaction_depth: 0,
658 group_interval: Duration::from_millis(300),
659 },
660 title: Default::default(),
661 }
662 }
663
664 pub fn clone(&self, new_cx: &mut Context<Self>) -> Self {
665 let mut buffers = HashMap::default();
666 let buffer_changed_since_sync = Rc::new(Cell::new(false));
667 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
668 buffer_state.buffer.update(new_cx, |buffer, _| {
669 buffer.record_changes(Rc::downgrade(&buffer_changed_since_sync));
670 });
671 buffers.insert(
672 *buffer_id,
673 BufferState {
674 buffer: buffer_state.buffer.clone(),
675 last_version: buffer_state.last_version.clone(),
676 last_non_text_state_update_count: buffer_state.last_non_text_state_update_count,
677 excerpts: buffer_state.excerpts.clone(),
678 _subscriptions: [
679 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
680 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
681 ],
682 },
683 );
684 }
685 let mut diff_bases = HashMap::default();
686 for (buffer_id, diff) in self.diffs.iter() {
687 diff_bases.insert(*buffer_id, DiffState::new(diff.diff.clone(), new_cx));
688 }
689 Self {
690 snapshot: RefCell::new(self.snapshot.borrow().clone()),
691 buffers: RefCell::new(buffers),
692 excerpts_by_path: Default::default(),
693 paths_by_excerpt: Default::default(),
694 diffs: diff_bases,
695 subscriptions: Default::default(),
696 singleton: self.singleton,
697 capability: self.capability,
698 history: self.history.clone(),
699 title: self.title.clone(),
700 buffer_changed_since_sync,
701 }
702 }
703
704 pub fn with_title(mut self, title: String) -> Self {
705 self.title = Some(title);
706 self
707 }
708
709 pub fn read_only(&self) -> bool {
710 self.capability == Capability::ReadOnly
711 }
712
713 pub fn singleton(buffer: Entity<Buffer>, cx: &mut Context<Self>) -> Self {
714 let mut this = Self::new(buffer.read(cx).capability());
715 this.singleton = true;
716 this.push_excerpts(
717 buffer,
718 [ExcerptRange::new(text::Anchor::MIN..text::Anchor::MAX)],
719 cx,
720 );
721 this.snapshot.borrow_mut().singleton = true;
722 this
723 }
724
725 /// Returns an up-to-date snapshot of the MultiBuffer.
726 pub fn snapshot(&self, cx: &App) -> MultiBufferSnapshot {
727 self.sync(cx);
728 self.snapshot.borrow().clone()
729 }
730
731 pub fn read(&self, cx: &App) -> Ref<'_, MultiBufferSnapshot> {
732 self.sync(cx);
733 self.snapshot.borrow()
734 }
735
736 pub fn as_singleton(&self) -> Option<Entity<Buffer>> {
737 if self.singleton {
738 return Some(
739 self.buffers
740 .borrow()
741 .values()
742 .next()
743 .unwrap()
744 .buffer
745 .clone(),
746 );
747 } else {
748 None
749 }
750 }
751
752 pub fn is_singleton(&self) -> bool {
753 self.singleton
754 }
755
756 pub fn subscribe(&mut self) -> Subscription {
757 self.subscriptions.subscribe()
758 }
759
760 pub fn is_dirty(&self, cx: &App) -> bool {
761 self.read(cx).is_dirty()
762 }
763
764 pub fn has_deleted_file(&self, cx: &App) -> bool {
765 self.read(cx).has_deleted_file()
766 }
767
768 pub fn has_conflict(&self, cx: &App) -> bool {
769 self.read(cx).has_conflict()
770 }
771
772 // The `is_empty` signature doesn't match what clippy expects
773 #[allow(clippy::len_without_is_empty)]
774 pub fn len(&self, cx: &App) -> usize {
775 self.read(cx).len()
776 }
777
778 pub fn is_empty(&self) -> bool {
779 self.buffers.borrow().is_empty()
780 }
781
782 pub fn symbols_containing<T: ToOffset>(
783 &self,
784 offset: T,
785 theme: Option<&SyntaxTheme>,
786 cx: &App,
787 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
788 self.read(cx).symbols_containing(offset, theme)
789 }
790
791 pub fn edit<I, S, T>(
792 &self,
793 edits: I,
794 autoindent_mode: Option<AutoindentMode>,
795 cx: &mut Context<Self>,
796 ) where
797 I: IntoIterator<Item = (Range<S>, T)>,
798 S: ToOffset,
799 T: Into<Arc<str>>,
800 {
801 let snapshot = self.read(cx);
802 let edits = edits
803 .into_iter()
804 .map(|(range, new_text)| {
805 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
806 if range.start > range.end {
807 mem::swap(&mut range.start, &mut range.end);
808 }
809 (range, new_text.into())
810 })
811 .collect::<Vec<_>>();
812
813 return edit_internal(self, snapshot, edits, autoindent_mode, cx);
814
815 // Non-generic part of edit, hoisted out to avoid blowing up LLVM IR.
816 fn edit_internal(
817 this: &MultiBuffer,
818 snapshot: Ref<MultiBufferSnapshot>,
819 edits: Vec<(Range<usize>, Arc<str>)>,
820 mut autoindent_mode: Option<AutoindentMode>,
821 cx: &mut Context<MultiBuffer>,
822 ) {
823 if this.read_only() || this.buffers.borrow().is_empty() {
824 return;
825 }
826
827 let original_indent_columns = match &mut autoindent_mode {
828 Some(AutoindentMode::Block {
829 original_indent_columns,
830 }) => mem::take(original_indent_columns),
831 _ => Default::default(),
832 };
833
834 let (buffer_edits, edited_excerpt_ids) =
835 this.convert_edits_to_buffer_edits(edits, &snapshot, &original_indent_columns);
836 drop(snapshot);
837
838 let mut buffer_ids = Vec::new();
839 for (buffer_id, mut edits) in buffer_edits {
840 buffer_ids.push(buffer_id);
841 edits.sort_by_key(|edit| edit.range.start);
842 this.buffers.borrow()[&buffer_id]
843 .buffer
844 .update(cx, |buffer, cx| {
845 let mut edits = edits.into_iter().peekable();
846 let mut insertions = Vec::new();
847 let mut original_indent_columns = Vec::new();
848 let mut deletions = Vec::new();
849 let empty_str: Arc<str> = Arc::default();
850 while let Some(BufferEdit {
851 mut range,
852 mut new_text,
853 mut is_insertion,
854 original_indent_column,
855 excerpt_id,
856 }) = edits.next()
857 {
858 while let Some(BufferEdit {
859 range: next_range,
860 is_insertion: next_is_insertion,
861 new_text: next_new_text,
862 excerpt_id: next_excerpt_id,
863 ..
864 }) = edits.peek()
865 {
866 if range.end >= next_range.start {
867 range.end = cmp::max(next_range.end, range.end);
868 is_insertion |= *next_is_insertion;
869 if excerpt_id == *next_excerpt_id {
870 new_text = format!("{new_text}{next_new_text}").into();
871 }
872 edits.next();
873 } else {
874 break;
875 }
876 }
877
878 if is_insertion {
879 original_indent_columns.push(original_indent_column);
880 insertions.push((
881 buffer.anchor_before(range.start)
882 ..buffer.anchor_before(range.end),
883 new_text.clone(),
884 ));
885 } else if !range.is_empty() {
886 deletions.push((
887 buffer.anchor_before(range.start)
888 ..buffer.anchor_before(range.end),
889 empty_str.clone(),
890 ));
891 }
892 }
893
894 let deletion_autoindent_mode =
895 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
896 Some(AutoindentMode::Block {
897 original_indent_columns: Default::default(),
898 })
899 } else {
900 autoindent_mode.clone()
901 };
902 let insertion_autoindent_mode =
903 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
904 Some(AutoindentMode::Block {
905 original_indent_columns,
906 })
907 } else {
908 autoindent_mode.clone()
909 };
910
911 buffer.edit(deletions, deletion_autoindent_mode, cx);
912 buffer.edit(insertions, insertion_autoindent_mode, cx);
913 })
914 }
915
916 cx.emit(Event::ExcerptsEdited {
917 excerpt_ids: edited_excerpt_ids,
918 buffer_ids,
919 });
920 }
921 }
922
923 fn convert_edits_to_buffer_edits(
924 &self,
925 edits: Vec<(Range<usize>, Arc<str>)>,
926 snapshot: &MultiBufferSnapshot,
927 original_indent_columns: &[Option<u32>],
928 ) -> (HashMap<BufferId, Vec<BufferEdit>>, Vec<ExcerptId>) {
929 let mut buffer_edits: HashMap<BufferId, Vec<BufferEdit>> = Default::default();
930 let mut edited_excerpt_ids = Vec::new();
931 let mut cursor = snapshot.cursor::<usize>();
932 for (ix, (range, new_text)) in edits.into_iter().enumerate() {
933 let original_indent_column = original_indent_columns.get(ix).copied().flatten();
934
935 cursor.seek(&range.start);
936 let mut start_region = cursor.region().expect("start offset out of bounds");
937 if !start_region.is_main_buffer {
938 cursor.next();
939 if let Some(region) = cursor.region() {
940 start_region = region;
941 } else {
942 continue;
943 }
944 }
945
946 if range.end < start_region.range.start {
947 continue;
948 }
949
950 if range.end > start_region.range.end {
951 cursor.seek_forward(&range.end);
952 }
953 let mut end_region = cursor.region().expect("end offset out of bounds");
954 if !end_region.is_main_buffer {
955 cursor.prev();
956 if let Some(region) = cursor.region() {
957 end_region = region;
958 } else {
959 continue;
960 }
961 }
962
963 if range.start > end_region.range.end {
964 continue;
965 }
966
967 let start_overshoot = range.start.saturating_sub(start_region.range.start);
968 let end_overshoot = range.end.saturating_sub(end_region.range.start);
969 let buffer_start = (start_region.buffer_range.start + start_overshoot)
970 .min(start_region.buffer_range.end);
971 let buffer_end =
972 (end_region.buffer_range.start + end_overshoot).min(end_region.buffer_range.end);
973
974 if start_region.excerpt.id == end_region.excerpt.id {
975 if start_region.is_main_buffer {
976 edited_excerpt_ids.push(start_region.excerpt.id);
977 buffer_edits
978 .entry(start_region.buffer.remote_id())
979 .or_default()
980 .push(BufferEdit {
981 range: buffer_start..buffer_end,
982 new_text,
983 is_insertion: true,
984 original_indent_column,
985 excerpt_id: start_region.excerpt.id,
986 });
987 }
988 } else {
989 let start_excerpt_range = buffer_start..start_region.buffer_range.end;
990 let end_excerpt_range = end_region.buffer_range.start..buffer_end;
991 if start_region.is_main_buffer {
992 edited_excerpt_ids.push(start_region.excerpt.id);
993 buffer_edits
994 .entry(start_region.buffer.remote_id())
995 .or_default()
996 .push(BufferEdit {
997 range: start_excerpt_range,
998 new_text: new_text.clone(),
999 is_insertion: true,
1000 original_indent_column,
1001 excerpt_id: start_region.excerpt.id,
1002 });
1003 }
1004 if end_region.is_main_buffer {
1005 edited_excerpt_ids.push(end_region.excerpt.id);
1006 buffer_edits
1007 .entry(end_region.buffer.remote_id())
1008 .or_default()
1009 .push(BufferEdit {
1010 range: end_excerpt_range,
1011 new_text: new_text.clone(),
1012 is_insertion: false,
1013 original_indent_column,
1014 excerpt_id: end_region.excerpt.id,
1015 });
1016 }
1017
1018 cursor.seek(&range.start);
1019 cursor.next_excerpt();
1020 while let Some(region) = cursor.region() {
1021 if region.excerpt.id == end_region.excerpt.id {
1022 break;
1023 }
1024 if region.is_main_buffer {
1025 edited_excerpt_ids.push(region.excerpt.id);
1026 buffer_edits
1027 .entry(region.buffer.remote_id())
1028 .or_default()
1029 .push(BufferEdit {
1030 range: region.buffer_range,
1031 new_text: new_text.clone(),
1032 is_insertion: false,
1033 original_indent_column,
1034 excerpt_id: region.excerpt.id,
1035 });
1036 }
1037 cursor.next_excerpt();
1038 }
1039 }
1040 }
1041 (buffer_edits, edited_excerpt_ids)
1042 }
1043
1044 pub fn autoindent_ranges<I, S>(&self, ranges: I, cx: &mut Context<Self>)
1045 where
1046 I: IntoIterator<Item = Range<S>>,
1047 S: ToOffset,
1048 {
1049 let snapshot = self.read(cx);
1050 let empty = Arc::<str>::from("");
1051 let edits = ranges
1052 .into_iter()
1053 .map(|range| {
1054 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
1055 if range.start > range.end {
1056 mem::swap(&mut range.start, &mut range.end);
1057 }
1058 (range, empty.clone())
1059 })
1060 .collect::<Vec<_>>();
1061
1062 return autoindent_ranges_internal(self, snapshot, edits, cx);
1063
1064 fn autoindent_ranges_internal(
1065 this: &MultiBuffer,
1066 snapshot: Ref<MultiBufferSnapshot>,
1067 edits: Vec<(Range<usize>, Arc<str>)>,
1068 cx: &mut Context<MultiBuffer>,
1069 ) {
1070 if this.read_only() || this.buffers.borrow().is_empty() {
1071 return;
1072 }
1073
1074 let (buffer_edits, edited_excerpt_ids) =
1075 this.convert_edits_to_buffer_edits(edits, &snapshot, &[]);
1076 drop(snapshot);
1077
1078 let mut buffer_ids = Vec::new();
1079 for (buffer_id, mut edits) in buffer_edits {
1080 buffer_ids.push(buffer_id);
1081 edits.sort_unstable_by_key(|edit| edit.range.start);
1082
1083 let mut ranges: Vec<Range<usize>> = Vec::new();
1084 for edit in edits {
1085 if let Some(last_range) = ranges.last_mut() {
1086 if edit.range.start <= last_range.end {
1087 last_range.end = last_range.end.max(edit.range.end);
1088 continue;
1089 }
1090 }
1091 ranges.push(edit.range);
1092 }
1093
1094 this.buffers.borrow()[&buffer_id]
1095 .buffer
1096 .update(cx, |buffer, cx| {
1097 buffer.autoindent_ranges(ranges, cx);
1098 })
1099 }
1100
1101 cx.emit(Event::ExcerptsEdited {
1102 excerpt_ids: edited_excerpt_ids,
1103 buffer_ids,
1104 });
1105 }
1106 }
1107
1108 // Inserts newlines at the given position to create an empty line, returning the start of the new line.
1109 // You can also request the insertion of empty lines above and below the line starting at the returned point.
1110 // Panics if the given position is invalid.
1111 pub fn insert_empty_line(
1112 &mut self,
1113 position: impl ToPoint,
1114 space_above: bool,
1115 space_below: bool,
1116 cx: &mut Context<Self>,
1117 ) -> Point {
1118 let multibuffer_point = position.to_point(&self.read(cx));
1119 let (buffer, buffer_point, _) = self.point_to_buffer_point(multibuffer_point, cx).unwrap();
1120 self.start_transaction(cx);
1121 let empty_line_start = buffer.update(cx, |buffer, cx| {
1122 buffer.insert_empty_line(buffer_point, space_above, space_below, cx)
1123 });
1124 self.end_transaction(cx);
1125 multibuffer_point + (empty_line_start - buffer_point)
1126 }
1127
1128 pub fn start_transaction(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1129 self.start_transaction_at(Instant::now(), cx)
1130 }
1131
1132 pub fn start_transaction_at(
1133 &mut self,
1134 now: Instant,
1135 cx: &mut Context<Self>,
1136 ) -> Option<TransactionId> {
1137 if let Some(buffer) = self.as_singleton() {
1138 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
1139 }
1140
1141 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1142 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
1143 }
1144 self.history.start_transaction(now)
1145 }
1146
1147 pub fn last_transaction_id(&self, cx: &App) -> Option<TransactionId> {
1148 if let Some(buffer) = self.as_singleton() {
1149 return buffer
1150 .read(cx)
1151 .peek_undo_stack()
1152 .map(|history_entry| history_entry.transaction_id());
1153 } else {
1154 let last_transaction = self.history.undo_stack.last()?;
1155 return Some(last_transaction.id);
1156 }
1157 }
1158
1159 pub fn end_transaction(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1160 self.end_transaction_at(Instant::now(), cx)
1161 }
1162
1163 pub fn end_transaction_at(
1164 &mut self,
1165 now: Instant,
1166 cx: &mut Context<Self>,
1167 ) -> Option<TransactionId> {
1168 if let Some(buffer) = self.as_singleton() {
1169 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
1170 }
1171
1172 let mut buffer_transactions = HashMap::default();
1173 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1174 if let Some(transaction_id) =
1175 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
1176 {
1177 buffer_transactions.insert(buffer.read(cx).remote_id(), transaction_id);
1178 }
1179 }
1180
1181 if self.history.end_transaction(now, buffer_transactions) {
1182 let transaction_id = self.history.group().unwrap();
1183 Some(transaction_id)
1184 } else {
1185 None
1186 }
1187 }
1188
1189 pub fn edited_ranges_for_transaction<D>(
1190 &self,
1191 transaction_id: TransactionId,
1192 cx: &App,
1193 ) -> Vec<Range<D>>
1194 where
1195 D: TextDimension + Ord + Sub<D, Output = D>,
1196 {
1197 let Some(transaction) = self.history.transaction(transaction_id) else {
1198 return Vec::new();
1199 };
1200
1201 let mut ranges = Vec::new();
1202 let snapshot = self.read(cx);
1203 let buffers = self.buffers.borrow();
1204 let mut cursor = snapshot.excerpts.cursor::<ExcerptSummary>(&());
1205
1206 for (buffer_id, buffer_transaction) in &transaction.buffer_transactions {
1207 let Some(buffer_state) = buffers.get(buffer_id) else {
1208 continue;
1209 };
1210
1211 let buffer = buffer_state.buffer.read(cx);
1212 for range in buffer.edited_ranges_for_transaction_id::<D>(*buffer_transaction) {
1213 for excerpt_id in &buffer_state.excerpts {
1214 cursor.seek(excerpt_id, Bias::Left, &());
1215 if let Some(excerpt) = cursor.item() {
1216 if excerpt.locator == *excerpt_id {
1217 let excerpt_buffer_start =
1218 excerpt.range.context.start.summary::<D>(&buffer);
1219 let excerpt_buffer_end =
1220 excerpt.range.context.end.summary::<D>(&buffer);
1221 let excerpt_range = excerpt_buffer_start..excerpt_buffer_end;
1222 if excerpt_range.contains(&range.start)
1223 && excerpt_range.contains(&range.end)
1224 {
1225 let excerpt_start = D::from_text_summary(&cursor.start().text);
1226
1227 let mut start = excerpt_start;
1228 start.add_assign(&(range.start - excerpt_buffer_start));
1229 let mut end = excerpt_start;
1230 end.add_assign(&(range.end - excerpt_buffer_start));
1231
1232 ranges.push(start..end);
1233 break;
1234 }
1235 }
1236 }
1237 }
1238 }
1239 }
1240
1241 ranges.sort_by_key(|range| range.start);
1242 ranges
1243 }
1244
1245 pub fn merge_transactions(
1246 &mut self,
1247 transaction: TransactionId,
1248 destination: TransactionId,
1249 cx: &mut Context<Self>,
1250 ) {
1251 if let Some(buffer) = self.as_singleton() {
1252 buffer.update(cx, |buffer, _| {
1253 buffer.merge_transactions(transaction, destination)
1254 });
1255 } else if let Some(transaction) = self.history.forget(transaction) {
1256 if let Some(destination) = self.history.transaction_mut(destination) {
1257 for (buffer_id, buffer_transaction_id) in transaction.buffer_transactions {
1258 if let Some(destination_buffer_transaction_id) =
1259 destination.buffer_transactions.get(&buffer_id)
1260 {
1261 if let Some(state) = self.buffers.borrow().get(&buffer_id) {
1262 state.buffer.update(cx, |buffer, _| {
1263 buffer.merge_transactions(
1264 buffer_transaction_id,
1265 *destination_buffer_transaction_id,
1266 )
1267 });
1268 }
1269 } else {
1270 destination
1271 .buffer_transactions
1272 .insert(buffer_id, buffer_transaction_id);
1273 }
1274 }
1275 }
1276 }
1277 }
1278
1279 pub fn finalize_last_transaction(&mut self, cx: &mut Context<Self>) {
1280 self.history.finalize_last_transaction();
1281 for BufferState { buffer, .. } in self.buffers.borrow().values() {
1282 buffer.update(cx, |buffer, _| {
1283 buffer.finalize_last_transaction();
1284 });
1285 }
1286 }
1287
1288 pub fn push_transaction<'a, T>(&mut self, buffer_transactions: T, cx: &Context<Self>)
1289 where
1290 T: IntoIterator<Item = (&'a Entity<Buffer>, &'a language::Transaction)>,
1291 {
1292 self.history
1293 .push_transaction(buffer_transactions, Instant::now(), cx);
1294 self.history.finalize_last_transaction();
1295 }
1296
1297 pub fn group_until_transaction(
1298 &mut self,
1299 transaction_id: TransactionId,
1300 cx: &mut Context<Self>,
1301 ) {
1302 if let Some(buffer) = self.as_singleton() {
1303 buffer.update(cx, |buffer, _| {
1304 buffer.group_until_transaction(transaction_id)
1305 });
1306 } else {
1307 self.history.group_until(transaction_id);
1308 }
1309 }
1310
1311 pub fn set_active_selections(
1312 &self,
1313 selections: &[Selection<Anchor>],
1314 line_mode: bool,
1315 cursor_shape: CursorShape,
1316 cx: &mut Context<Self>,
1317 ) {
1318 let mut selections_by_buffer: HashMap<BufferId, Vec<Selection<text::Anchor>>> =
1319 Default::default();
1320 let snapshot = self.read(cx);
1321 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
1322 for selection in selections {
1323 let start_locator = snapshot.excerpt_locator_for_id(selection.start.excerpt_id);
1324 let end_locator = snapshot.excerpt_locator_for_id(selection.end.excerpt_id);
1325
1326 cursor.seek(&Some(start_locator), Bias::Left, &());
1327 while let Some(excerpt) = cursor.item() {
1328 if excerpt.locator > *end_locator {
1329 break;
1330 }
1331
1332 let mut start = excerpt.range.context.start;
1333 let mut end = excerpt.range.context.end;
1334 if excerpt.id == selection.start.excerpt_id {
1335 start = selection.start.text_anchor;
1336 }
1337 if excerpt.id == selection.end.excerpt_id {
1338 end = selection.end.text_anchor;
1339 }
1340 selections_by_buffer
1341 .entry(excerpt.buffer_id)
1342 .or_default()
1343 .push(Selection {
1344 id: selection.id,
1345 start,
1346 end,
1347 reversed: selection.reversed,
1348 goal: selection.goal,
1349 });
1350
1351 cursor.next(&());
1352 }
1353 }
1354
1355 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
1356 if !selections_by_buffer.contains_key(buffer_id) {
1357 buffer_state
1358 .buffer
1359 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1360 }
1361 }
1362
1363 for (buffer_id, mut selections) in selections_by_buffer {
1364 self.buffers.borrow()[&buffer_id]
1365 .buffer
1366 .update(cx, |buffer, cx| {
1367 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer));
1368 let mut selections = selections.into_iter().peekable();
1369 let merged_selections = Arc::from_iter(iter::from_fn(|| {
1370 let mut selection = selections.next()?;
1371 while let Some(next_selection) = selections.peek() {
1372 if selection.end.cmp(&next_selection.start, buffer).is_ge() {
1373 let next_selection = selections.next().unwrap();
1374 if next_selection.end.cmp(&selection.end, buffer).is_ge() {
1375 selection.end = next_selection.end;
1376 }
1377 } else {
1378 break;
1379 }
1380 }
1381 Some(selection)
1382 }));
1383 buffer.set_active_selections(merged_selections, line_mode, cursor_shape, cx);
1384 });
1385 }
1386 }
1387
1388 pub fn remove_active_selections(&self, cx: &mut Context<Self>) {
1389 for buffer in self.buffers.borrow().values() {
1390 buffer
1391 .buffer
1392 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1393 }
1394 }
1395
1396 pub fn undo(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1397 let mut transaction_id = None;
1398 if let Some(buffer) = self.as_singleton() {
1399 transaction_id = buffer.update(cx, |buffer, cx| buffer.undo(cx));
1400 } else {
1401 while let Some(transaction) = self.history.pop_undo() {
1402 let mut undone = false;
1403 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
1404 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
1405 undone |= buffer.update(cx, |buffer, cx| {
1406 let undo_to = *buffer_transaction_id;
1407 if let Some(entry) = buffer.peek_undo_stack() {
1408 *buffer_transaction_id = entry.transaction_id();
1409 }
1410 buffer.undo_to_transaction(undo_to, cx)
1411 });
1412 }
1413 }
1414
1415 if undone {
1416 transaction_id = Some(transaction.id);
1417 break;
1418 }
1419 }
1420 }
1421
1422 if let Some(transaction_id) = transaction_id {
1423 cx.emit(Event::TransactionUndone { transaction_id });
1424 }
1425
1426 transaction_id
1427 }
1428
1429 pub fn redo(&mut self, cx: &mut Context<Self>) -> Option<TransactionId> {
1430 if let Some(buffer) = self.as_singleton() {
1431 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
1432 }
1433
1434 while let Some(transaction) = self.history.pop_redo() {
1435 let mut redone = false;
1436 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
1437 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
1438 redone |= buffer.update(cx, |buffer, cx| {
1439 let redo_to = *buffer_transaction_id;
1440 if let Some(entry) = buffer.peek_redo_stack() {
1441 *buffer_transaction_id = entry.transaction_id();
1442 }
1443 buffer.redo_to_transaction(redo_to, cx)
1444 });
1445 }
1446 }
1447
1448 if redone {
1449 return Some(transaction.id);
1450 }
1451 }
1452
1453 None
1454 }
1455
1456 pub fn undo_transaction(&mut self, transaction_id: TransactionId, cx: &mut Context<Self>) {
1457 if let Some(buffer) = self.as_singleton() {
1458 buffer.update(cx, |buffer, cx| buffer.undo_transaction(transaction_id, cx));
1459 } else if let Some(transaction) = self.history.remove_from_undo(transaction_id) {
1460 for (buffer_id, transaction_id) in &transaction.buffer_transactions {
1461 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
1462 buffer.update(cx, |buffer, cx| {
1463 buffer.undo_transaction(*transaction_id, cx)
1464 });
1465 }
1466 }
1467 }
1468 }
1469
1470 pub fn forget_transaction(&mut self, transaction_id: TransactionId, cx: &mut Context<Self>) {
1471 if let Some(buffer) = self.as_singleton() {
1472 buffer.update(cx, |buffer, _| {
1473 buffer.forget_transaction(transaction_id);
1474 });
1475 } else if let Some(transaction) = self.history.forget(transaction_id) {
1476 for (buffer_id, buffer_transaction_id) in transaction.buffer_transactions {
1477 if let Some(state) = self.buffers.borrow_mut().get_mut(&buffer_id) {
1478 state.buffer.update(cx, |buffer, _| {
1479 buffer.forget_transaction(buffer_transaction_id);
1480 });
1481 }
1482 }
1483 }
1484 }
1485
1486 pub fn push_excerpts<O>(
1487 &mut self,
1488 buffer: Entity<Buffer>,
1489 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1490 cx: &mut Context<Self>,
1491 ) -> Vec<ExcerptId>
1492 where
1493 O: text::ToOffset,
1494 {
1495 self.insert_excerpts_after(ExcerptId::max(), buffer, ranges, cx)
1496 }
1497
1498 pub fn location_for_path(&self, path: &PathKey, cx: &App) -> Option<Anchor> {
1499 let excerpt_id = self.excerpts_by_path.get(path)?.first()?;
1500 let snapshot = self.snapshot(cx);
1501 let excerpt = snapshot.excerpt(*excerpt_id)?;
1502 Some(Anchor::in_buffer(
1503 *excerpt_id,
1504 excerpt.buffer_id,
1505 excerpt.range.context.start,
1506 ))
1507 }
1508
1509 pub fn excerpt_paths(&self) -> impl Iterator<Item = &PathKey> {
1510 self.excerpts_by_path.keys()
1511 }
1512
1513 fn expand_excerpts_with_paths(
1514 &mut self,
1515 ids: impl IntoIterator<Item = ExcerptId>,
1516 line_count: u32,
1517 direction: ExpandExcerptDirection,
1518 cx: &mut Context<Self>,
1519 ) {
1520 let grouped = ids
1521 .into_iter()
1522 .chunk_by(|id| self.paths_by_excerpt.get(id).cloned())
1523 .into_iter()
1524 .flat_map(|(k, v)| Some((k?, v.into_iter().collect::<Vec<_>>())))
1525 .collect::<Vec<_>>();
1526 let snapshot = self.snapshot(cx);
1527
1528 for (path, ids) in grouped.into_iter() {
1529 let Some(excerpt_ids) = self.excerpts_by_path.get(&path) else {
1530 continue;
1531 };
1532
1533 let ids_to_expand = HashSet::from_iter(ids);
1534 let expanded_ranges = excerpt_ids.iter().filter_map(|excerpt_id| {
1535 let excerpt = snapshot.excerpt(*excerpt_id)?;
1536
1537 let mut context = excerpt.range.context.to_point(&excerpt.buffer);
1538 if ids_to_expand.contains(excerpt_id) {
1539 match direction {
1540 ExpandExcerptDirection::Up => {
1541 context.start.row = context.start.row.saturating_sub(line_count);
1542 context.start.column = 0;
1543 }
1544 ExpandExcerptDirection::Down => {
1545 context.end.row =
1546 (context.end.row + line_count).min(excerpt.buffer.max_point().row);
1547 context.end.column = excerpt.buffer.line_len(context.end.row);
1548 }
1549 ExpandExcerptDirection::UpAndDown => {
1550 context.start.row = context.start.row.saturating_sub(line_count);
1551 context.start.column = 0;
1552 context.end.row =
1553 (context.end.row + line_count).min(excerpt.buffer.max_point().row);
1554 context.end.column = excerpt.buffer.line_len(context.end.row);
1555 }
1556 }
1557 }
1558
1559 Some(ExcerptRange {
1560 context,
1561 primary: excerpt.range.primary.to_point(&excerpt.buffer),
1562 })
1563 });
1564 let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();
1565 for range in expanded_ranges {
1566 if let Some(last_range) = merged_ranges.last_mut() {
1567 if last_range.context.end >= range.context.start {
1568 last_range.context.end = range.context.end;
1569 continue;
1570 }
1571 }
1572 merged_ranges.push(range)
1573 }
1574 let Some(excerpt_id) = excerpt_ids.first() else {
1575 continue;
1576 };
1577 let Some(buffer_id) = &snapshot.buffer_id_for_excerpt(*excerpt_id) else {
1578 continue;
1579 };
1580
1581 let Some(buffer) = self
1582 .buffers
1583 .borrow()
1584 .get(buffer_id)
1585 .map(|b| b.buffer.clone())
1586 else {
1587 continue;
1588 };
1589
1590 let buffer_snapshot = buffer.read(cx).snapshot();
1591 self.update_path_excerpts(path.clone(), buffer, &buffer_snapshot, merged_ranges, cx);
1592 }
1593 }
1594
1595 /// Sets excerpts, returns `true` if at least one new excerpt was added.
1596 pub fn set_excerpts_for_path(
1597 &mut self,
1598 path: PathKey,
1599 buffer: Entity<Buffer>,
1600 ranges: impl IntoIterator<Item = Range<Point>>,
1601 context_line_count: u32,
1602 cx: &mut Context<Self>,
1603 ) -> (Vec<Range<Anchor>>, bool) {
1604 let buffer_snapshot = buffer.read(cx).snapshot();
1605 let excerpt_ranges = build_excerpt_ranges(ranges, context_line_count, &buffer_snapshot);
1606
1607 let (new, counts) = Self::merge_excerpt_ranges(&excerpt_ranges);
1608 self.set_merged_excerpt_ranges_for_path(
1609 path,
1610 buffer,
1611 excerpt_ranges,
1612 &buffer_snapshot,
1613 new,
1614 counts,
1615 cx,
1616 )
1617 }
1618
1619 pub fn set_excerpt_ranges_for_path(
1620 &mut self,
1621 path: PathKey,
1622 buffer: Entity<Buffer>,
1623 buffer_snapshot: &BufferSnapshot,
1624 excerpt_ranges: Vec<ExcerptRange<Point>>,
1625 cx: &mut Context<Self>,
1626 ) -> (Vec<Range<Anchor>>, bool) {
1627 let (new, counts) = Self::merge_excerpt_ranges(&excerpt_ranges);
1628 self.set_merged_excerpt_ranges_for_path(
1629 path,
1630 buffer,
1631 excerpt_ranges,
1632 buffer_snapshot,
1633 new,
1634 counts,
1635 cx,
1636 )
1637 }
1638
1639 pub fn set_anchored_excerpts_for_path(
1640 &self,
1641 buffer: Entity<Buffer>,
1642 ranges: Vec<Range<text::Anchor>>,
1643 context_line_count: u32,
1644 cx: &mut Context<Self>,
1645 ) -> Task<Vec<Range<Anchor>>> {
1646 let buffer_snapshot = buffer.read(cx).snapshot();
1647 let path_key = PathKey::for_buffer(&buffer, cx);
1648 cx.spawn(async move |multi_buffer, cx| {
1649 let snapshot = buffer_snapshot.clone();
1650 let (excerpt_ranges, new, counts) = cx
1651 .background_spawn(async move {
1652 let ranges = ranges.into_iter().map(|range| range.to_point(&snapshot));
1653 let excerpt_ranges =
1654 build_excerpt_ranges(ranges, context_line_count, &snapshot);
1655 let (new, counts) = Self::merge_excerpt_ranges(&excerpt_ranges);
1656 (excerpt_ranges, new, counts)
1657 })
1658 .await;
1659
1660 multi_buffer
1661 .update(cx, move |multi_buffer, cx| {
1662 let (ranges, _) = multi_buffer.set_merged_excerpt_ranges_for_path(
1663 path_key,
1664 buffer,
1665 excerpt_ranges,
1666 &buffer_snapshot,
1667 new,
1668 counts,
1669 cx,
1670 );
1671 ranges
1672 })
1673 .ok()
1674 .unwrap_or_default()
1675 })
1676 }
1677
1678 /// Sets excerpts, returns `true` if at least one new excerpt was added.
1679 fn set_merged_excerpt_ranges_for_path(
1680 &mut self,
1681 path: PathKey,
1682 buffer: Entity<Buffer>,
1683 ranges: Vec<ExcerptRange<Point>>,
1684 buffer_snapshot: &BufferSnapshot,
1685 new: Vec<ExcerptRange<Point>>,
1686 counts: Vec<usize>,
1687 cx: &mut Context<Self>,
1688 ) -> (Vec<Range<Anchor>>, bool) {
1689 let (excerpt_ids, added_a_new_excerpt) =
1690 self.update_path_excerpts(path, buffer, &buffer_snapshot, new, cx);
1691
1692 let mut result = Vec::new();
1693 let mut ranges = ranges.into_iter();
1694 for (excerpt_id, range_count) in excerpt_ids.into_iter().zip(counts.into_iter()) {
1695 for range in ranges.by_ref().take(range_count) {
1696 let range = Anchor::range_in_buffer(
1697 excerpt_id,
1698 buffer_snapshot.remote_id(),
1699 buffer_snapshot.anchor_before(&range.primary.start)
1700 ..buffer_snapshot.anchor_after(&range.primary.end),
1701 );
1702 result.push(range)
1703 }
1704 }
1705 (result, added_a_new_excerpt)
1706 }
1707
1708 fn merge_excerpt_ranges<'a>(
1709 expanded_ranges: impl IntoIterator<Item = &'a ExcerptRange<Point>> + 'a,
1710 ) -> (Vec<ExcerptRange<Point>>, Vec<usize>) {
1711 let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();
1712 let mut counts: Vec<usize> = Vec::new();
1713 for range in expanded_ranges {
1714 if let Some(last_range) = merged_ranges.last_mut() {
1715 debug_assert!(
1716 last_range.context.start <= range.context.start,
1717 "Last range: {last_range:?} Range: {range:?}"
1718 );
1719 if last_range.context.end >= range.context.start
1720 || last_range.context.end.row + 1 == range.context.start.row
1721 {
1722 last_range.context.end = range.context.end.max(last_range.context.end);
1723 *counts.last_mut().unwrap() += 1;
1724 continue;
1725 }
1726 }
1727 merged_ranges.push(range.clone());
1728 counts.push(1);
1729 }
1730 return (merged_ranges, counts);
1731 }
1732
1733 fn update_path_excerpts(
1734 &mut self,
1735 path: PathKey,
1736 buffer: Entity<Buffer>,
1737 buffer_snapshot: &BufferSnapshot,
1738 new: Vec<ExcerptRange<Point>>,
1739 cx: &mut Context<Self>,
1740 ) -> (Vec<ExcerptId>, bool) {
1741 let mut insert_after = self
1742 .excerpts_by_path
1743 .range(..path.clone())
1744 .next_back()
1745 .map(|(_, value)| *value.last().unwrap())
1746 .unwrap_or(ExcerptId::min());
1747
1748 let existing = self
1749 .excerpts_by_path
1750 .get(&path)
1751 .cloned()
1752 .unwrap_or_default();
1753
1754 let mut new_iter = new.into_iter().peekable();
1755 let mut existing_iter = existing.into_iter().peekable();
1756
1757 let mut excerpt_ids = Vec::new();
1758 let mut to_remove = Vec::new();
1759 let mut to_insert: Vec<(ExcerptId, ExcerptRange<Point>)> = Vec::new();
1760 let mut added_a_new_excerpt = false;
1761 let snapshot = self.snapshot(cx);
1762
1763 let mut next_excerpt_id =
1764 if let Some(last_entry) = self.snapshot.borrow().excerpt_ids.last() {
1765 last_entry.id.0 + 1
1766 } else {
1767 1
1768 };
1769
1770 let mut next_excerpt_id = move || ExcerptId(post_inc(&mut next_excerpt_id));
1771
1772 let mut excerpts_cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
1773 excerpts_cursor.next(&());
1774
1775 loop {
1776 let new = new_iter.peek();
1777 let existing = if let Some(existing_id) = existing_iter.peek() {
1778 let locator = snapshot.excerpt_locator_for_id(*existing_id);
1779 excerpts_cursor.seek_forward(&Some(locator), Bias::Left, &());
1780 if let Some(excerpt) = excerpts_cursor.item() {
1781 if excerpt.buffer_id != buffer_snapshot.remote_id() {
1782 to_remove.push(*existing_id);
1783 existing_iter.next();
1784 continue;
1785 }
1786 Some((
1787 *existing_id,
1788 excerpt.range.context.to_point(&buffer_snapshot),
1789 ))
1790 } else {
1791 None
1792 }
1793 } else {
1794 None
1795 };
1796
1797 if let Some((last_id, last)) = to_insert.last_mut() {
1798 if let Some(new) = new {
1799 if last.context.end >= new.context.start {
1800 last.context.end = last.context.end.max(new.context.end);
1801 excerpt_ids.push(*last_id);
1802 new_iter.next();
1803 continue;
1804 }
1805 }
1806 if let Some((existing_id, existing_range)) = &existing {
1807 if last.context.end >= existing_range.start {
1808 last.context.end = last.context.end.max(existing_range.end);
1809 to_remove.push(*existing_id);
1810 self.snapshot
1811 .borrow_mut()
1812 .replaced_excerpts
1813 .insert(*existing_id, *last_id);
1814 existing_iter.next();
1815 continue;
1816 }
1817 }
1818 }
1819
1820 match (new, existing) {
1821 (None, None) => break,
1822 (None, Some((existing_id, _))) => {
1823 existing_iter.next();
1824 to_remove.push(existing_id);
1825 continue;
1826 }
1827 (Some(_), None) => {
1828 added_a_new_excerpt = true;
1829 let new_id = next_excerpt_id();
1830 excerpt_ids.push(new_id);
1831 to_insert.push((new_id, new_iter.next().unwrap()));
1832 continue;
1833 }
1834 (Some(new), Some((_, existing_range))) => {
1835 if existing_range.end < new.context.start {
1836 let existing_id = existing_iter.next().unwrap();
1837 to_remove.push(existing_id);
1838 continue;
1839 } else if existing_range.start > new.context.end {
1840 let new_id = next_excerpt_id();
1841 excerpt_ids.push(new_id);
1842 to_insert.push((new_id, new_iter.next().unwrap()));
1843 continue;
1844 }
1845
1846 if existing_range.start == new.context.start
1847 && existing_range.end == new.context.end
1848 {
1849 self.insert_excerpts_with_ids_after(
1850 insert_after,
1851 buffer.clone(),
1852 mem::take(&mut to_insert),
1853 cx,
1854 );
1855 insert_after = existing_iter.next().unwrap();
1856 excerpt_ids.push(insert_after);
1857 new_iter.next();
1858 } else {
1859 let existing_id = existing_iter.next().unwrap();
1860 let new_id = next_excerpt_id();
1861 self.snapshot
1862 .borrow_mut()
1863 .replaced_excerpts
1864 .insert(existing_id, new_id);
1865 to_remove.push(existing_id);
1866 let mut range = new_iter.next().unwrap();
1867 range.context.start = range.context.start.min(existing_range.start);
1868 range.context.end = range.context.end.max(existing_range.end);
1869 excerpt_ids.push(new_id);
1870 to_insert.push((new_id, range));
1871 }
1872 }
1873 };
1874 }
1875
1876 self.insert_excerpts_with_ids_after(insert_after, buffer, to_insert, cx);
1877 self.remove_excerpts(to_remove, cx);
1878 if excerpt_ids.is_empty() {
1879 self.excerpts_by_path.remove(&path);
1880 } else {
1881 for excerpt_id in &excerpt_ids {
1882 self.paths_by_excerpt.insert(*excerpt_id, path.clone());
1883 }
1884 self.excerpts_by_path
1885 .insert(path, excerpt_ids.iter().dedup().cloned().collect());
1886 }
1887
1888 (excerpt_ids, added_a_new_excerpt)
1889 }
1890
1891 pub fn paths(&self) -> impl Iterator<Item = PathKey> + '_ {
1892 self.excerpts_by_path.keys().cloned()
1893 }
1894
1895 pub fn remove_excerpts_for_path(&mut self, path: PathKey, cx: &mut Context<Self>) {
1896 if let Some(to_remove) = self.excerpts_by_path.remove(&path) {
1897 self.remove_excerpts(to_remove, cx)
1898 }
1899 }
1900
1901 pub fn insert_excerpts_after<O>(
1902 &mut self,
1903 prev_excerpt_id: ExcerptId,
1904 buffer: Entity<Buffer>,
1905 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1906 cx: &mut Context<Self>,
1907 ) -> Vec<ExcerptId>
1908 where
1909 O: text::ToOffset,
1910 {
1911 let mut ids = Vec::new();
1912 let mut next_excerpt_id =
1913 if let Some(last_entry) = self.snapshot.borrow().excerpt_ids.last() {
1914 last_entry.id.0 + 1
1915 } else {
1916 1
1917 };
1918 self.insert_excerpts_with_ids_after(
1919 prev_excerpt_id,
1920 buffer,
1921 ranges.into_iter().map(|range| {
1922 let id = ExcerptId(post_inc(&mut next_excerpt_id));
1923 ids.push(id);
1924 (id, range)
1925 }),
1926 cx,
1927 );
1928 ids
1929 }
1930
1931 pub fn insert_excerpts_with_ids_after<O>(
1932 &mut self,
1933 prev_excerpt_id: ExcerptId,
1934 buffer: Entity<Buffer>,
1935 ranges: impl IntoIterator<Item = (ExcerptId, ExcerptRange<O>)>,
1936 cx: &mut Context<Self>,
1937 ) where
1938 O: text::ToOffset,
1939 {
1940 assert_eq!(self.history.transaction_depth, 0);
1941 let mut ranges = ranges.into_iter().peekable();
1942 if ranges.peek().is_none() {
1943 return Default::default();
1944 }
1945
1946 self.sync(cx);
1947
1948 let buffer_snapshot = buffer.read(cx).snapshot();
1949 let buffer_id = buffer_snapshot.remote_id();
1950
1951 let mut buffers = self.buffers.borrow_mut();
1952 let buffer_state = buffers.entry(buffer_id).or_insert_with(|| {
1953 self.buffer_changed_since_sync.replace(true);
1954 buffer.update(cx, |buffer, _| {
1955 buffer.record_changes(Rc::downgrade(&self.buffer_changed_since_sync));
1956 });
1957 BufferState {
1958 last_version: buffer_snapshot.version().clone(),
1959 last_non_text_state_update_count: buffer_snapshot.non_text_state_update_count(),
1960 excerpts: Default::default(),
1961 _subscriptions: [
1962 cx.observe(&buffer, |_, _, cx| cx.notify()),
1963 cx.subscribe(&buffer, Self::on_buffer_event),
1964 ],
1965 buffer: buffer.clone(),
1966 }
1967 });
1968
1969 let mut snapshot = self.snapshot.borrow_mut();
1970
1971 let mut prev_locator = snapshot.excerpt_locator_for_id(prev_excerpt_id).clone();
1972 let mut new_excerpt_ids = mem::take(&mut snapshot.excerpt_ids);
1973 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
1974 let mut new_excerpts = cursor.slice(&prev_locator, Bias::Right, &());
1975 prev_locator = cursor.start().unwrap_or(Locator::min_ref()).clone();
1976
1977 let edit_start = ExcerptOffset::new(new_excerpts.summary().text.len);
1978 new_excerpts.update_last(
1979 |excerpt| {
1980 excerpt.has_trailing_newline = true;
1981 },
1982 &(),
1983 );
1984
1985 let next_locator = if let Some(excerpt) = cursor.item() {
1986 excerpt.locator.clone()
1987 } else {
1988 Locator::max()
1989 };
1990
1991 let mut excerpts = Vec::new();
1992 while let Some((id, range)) = ranges.next() {
1993 let locator = Locator::between(&prev_locator, &next_locator);
1994 if let Err(ix) = buffer_state.excerpts.binary_search(&locator) {
1995 buffer_state.excerpts.insert(ix, locator.clone());
1996 }
1997 let range = ExcerptRange {
1998 context: buffer_snapshot.anchor_before(&range.context.start)
1999 ..buffer_snapshot.anchor_after(&range.context.end),
2000 primary: buffer_snapshot.anchor_before(&range.primary.start)
2001 ..buffer_snapshot.anchor_after(&range.primary.end),
2002 };
2003 excerpts.push((id, range.clone()));
2004 let excerpt = Excerpt::new(
2005 id,
2006 locator.clone(),
2007 buffer_id,
2008 buffer_snapshot.clone(),
2009 range,
2010 ranges.peek().is_some() || cursor.item().is_some(),
2011 );
2012 new_excerpts.push(excerpt, &());
2013 prev_locator = locator.clone();
2014
2015 if let Some(last_mapping_entry) = new_excerpt_ids.last() {
2016 assert!(id > last_mapping_entry.id, "excerpt ids must be increasing");
2017 }
2018 new_excerpt_ids.push(ExcerptIdMapping { id, locator }, &());
2019 }
2020
2021 let edit_end = ExcerptOffset::new(new_excerpts.summary().text.len);
2022
2023 let suffix = cursor.suffix(&());
2024 let changed_trailing_excerpt = suffix.is_empty();
2025 new_excerpts.append(suffix, &());
2026 drop(cursor);
2027 snapshot.excerpts = new_excerpts;
2028 snapshot.excerpt_ids = new_excerpt_ids;
2029 if changed_trailing_excerpt {
2030 snapshot.trailing_excerpt_update_count += 1;
2031 }
2032
2033 self.sync_diff_transforms(
2034 &mut snapshot,
2035 vec![Edit {
2036 old: edit_start..edit_start,
2037 new: edit_start..edit_end,
2038 }],
2039 DiffChangeKind::BufferEdited,
2040 );
2041 cx.emit(Event::Edited {
2042 singleton_buffer_edited: false,
2043 edited_buffer: None,
2044 });
2045 cx.emit(Event::ExcerptsAdded {
2046 buffer,
2047 predecessor: prev_excerpt_id,
2048 excerpts,
2049 });
2050 cx.notify();
2051 }
2052
2053 pub fn clear(&mut self, cx: &mut Context<Self>) {
2054 self.sync(cx);
2055 let ids = self.excerpt_ids();
2056 let removed_buffer_ids = self
2057 .buffers
2058 .borrow_mut()
2059 .drain()
2060 .map(|(id, _)| id)
2061 .collect();
2062 self.excerpts_by_path.clear();
2063 self.paths_by_excerpt.clear();
2064 let mut snapshot = self.snapshot.borrow_mut();
2065 let start = ExcerptOffset::new(0);
2066 let prev_len = ExcerptOffset::new(snapshot.excerpts.summary().text.len);
2067 snapshot.excerpts = Default::default();
2068 snapshot.trailing_excerpt_update_count += 1;
2069 snapshot.is_dirty = false;
2070 snapshot.has_deleted_file = false;
2071 snapshot.has_conflict = false;
2072 snapshot.replaced_excerpts.clear();
2073
2074 self.sync_diff_transforms(
2075 &mut snapshot,
2076 vec![Edit {
2077 old: start..prev_len,
2078 new: start..start,
2079 }],
2080 DiffChangeKind::BufferEdited,
2081 );
2082 cx.emit(Event::Edited {
2083 singleton_buffer_edited: false,
2084 edited_buffer: None,
2085 });
2086 cx.emit(Event::ExcerptsRemoved {
2087 ids,
2088 removed_buffer_ids,
2089 });
2090 cx.notify();
2091 }
2092
2093 pub fn excerpts_for_buffer(
2094 &self,
2095 buffer_id: BufferId,
2096 cx: &App,
2097 ) -> Vec<(ExcerptId, ExcerptRange<text::Anchor>)> {
2098 let mut excerpts = Vec::new();
2099 let snapshot = self.read(cx);
2100 let buffers = self.buffers.borrow();
2101 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(&());
2102 for locator in buffers
2103 .get(&buffer_id)
2104 .map(|state| &state.excerpts)
2105 .into_iter()
2106 .flatten()
2107 {
2108 cursor.seek_forward(&Some(locator), Bias::Left, &());
2109 if let Some(excerpt) = cursor.item() {
2110 if excerpt.locator == *locator {
2111 excerpts.push((excerpt.id, excerpt.range.clone()));
2112 }
2113 }
2114 }
2115
2116 excerpts
2117 }
2118
2119 pub fn excerpt_ranges_for_buffer(&self, buffer_id: BufferId, cx: &App) -> Vec<Range<Point>> {
2120 let snapshot = self.read(cx);
2121 let buffers = self.buffers.borrow();
2122 let mut excerpts = snapshot
2123 .excerpts
2124 .cursor::<(Option<&Locator>, ExcerptDimension<Point>)>(&());
2125 let mut diff_transforms = snapshot
2126 .diff_transforms
2127 .cursor::<(ExcerptDimension<Point>, OutputDimension<Point>)>(&());
2128 diff_transforms.next(&());
2129 let locators = buffers
2130 .get(&buffer_id)
2131 .into_iter()
2132 .flat_map(|state| &state.excerpts);
2133 let mut result = Vec::new();
2134 for locator in locators {
2135 excerpts.seek_forward(&Some(locator), Bias::Left, &());
2136 if let Some(excerpt) = excerpts.item() {
2137 if excerpt.locator == *locator {
2138 let excerpt_start = excerpts.start().1.clone();
2139 let excerpt_end =
2140 ExcerptDimension(excerpt_start.0 + excerpt.text_summary.lines);
2141
2142 diff_transforms.seek_forward(&excerpt_start, Bias::Left, &());
2143 let overshoot = excerpt_start.0 - diff_transforms.start().0.0;
2144 let start = diff_transforms.start().1.0 + overshoot;
2145
2146 diff_transforms.seek_forward(&excerpt_end, Bias::Right, &());
2147 let overshoot = excerpt_end.0 - diff_transforms.start().0.0;
2148 let end = diff_transforms.start().1.0 + overshoot;
2149
2150 result.push(start..end)
2151 }
2152 }
2153 }
2154 result
2155 }
2156
2157 pub fn excerpt_buffer_ids(&self) -> Vec<BufferId> {
2158 self.snapshot
2159 .borrow()
2160 .excerpts
2161 .iter()
2162 .map(|entry| entry.buffer_id)
2163 .collect()
2164 }
2165
2166 pub fn excerpt_ids(&self) -> Vec<ExcerptId> {
2167 self.snapshot
2168 .borrow()
2169 .excerpts
2170 .iter()
2171 .map(|entry| entry.id)
2172 .collect()
2173 }
2174
2175 pub fn excerpt_containing(
2176 &self,
2177 position: impl ToOffset,
2178 cx: &App,
2179 ) -> Option<(ExcerptId, Entity<Buffer>, Range<text::Anchor>)> {
2180 let snapshot = self.read(cx);
2181 let offset = position.to_offset(&snapshot);
2182
2183 let mut cursor = snapshot.cursor::<usize>();
2184 cursor.seek(&offset);
2185 cursor
2186 .excerpt()
2187 .or_else(|| snapshot.excerpts.last())
2188 .map(|excerpt| {
2189 (
2190 excerpt.id,
2191 self.buffers
2192 .borrow()
2193 .get(&excerpt.buffer_id)
2194 .unwrap()
2195 .buffer
2196 .clone(),
2197 excerpt.range.context.clone(),
2198 )
2199 })
2200 }
2201
2202 // If point is at the end of the buffer, the last excerpt is returned
2203 pub fn point_to_buffer_offset<T: ToOffset>(
2204 &self,
2205 point: T,
2206 cx: &App,
2207 ) -> Option<(Entity<Buffer>, usize)> {
2208 let snapshot = self.read(cx);
2209 let (buffer, offset) = snapshot.point_to_buffer_offset(point)?;
2210 Some((
2211 self.buffers
2212 .borrow()
2213 .get(&buffer.remote_id())?
2214 .buffer
2215 .clone(),
2216 offset,
2217 ))
2218 }
2219
2220 // If point is at the end of the buffer, the last excerpt is returned
2221 pub fn point_to_buffer_point<T: ToPoint>(
2222 &self,
2223 point: T,
2224 cx: &App,
2225 ) -> Option<(Entity<Buffer>, Point, ExcerptId)> {
2226 let snapshot = self.read(cx);
2227 let (buffer, point, is_main_buffer) =
2228 snapshot.point_to_buffer_point(point.to_point(&snapshot))?;
2229 Some((
2230 self.buffers
2231 .borrow()
2232 .get(&buffer.remote_id())?
2233 .buffer
2234 .clone(),
2235 point,
2236 is_main_buffer,
2237 ))
2238 }
2239
2240 pub fn buffer_point_to_anchor(
2241 &self,
2242 buffer: &Entity<Buffer>,
2243 point: Point,
2244 cx: &App,
2245 ) -> Option<Anchor> {
2246 let mut found = None;
2247 let snapshot = buffer.read(cx).snapshot();
2248 for (excerpt_id, range) in self.excerpts_for_buffer(snapshot.remote_id(), cx) {
2249 let start = range.context.start.to_point(&snapshot);
2250 let end = range.context.end.to_point(&snapshot);
2251 if start <= point && point < end {
2252 found = Some((snapshot.clip_point(point, Bias::Left), excerpt_id));
2253 break;
2254 }
2255 if point < start {
2256 found = Some((start, excerpt_id));
2257 }
2258 if point > end {
2259 found = Some((end, excerpt_id));
2260 }
2261 }
2262
2263 found.map(|(point, excerpt_id)| {
2264 let text_anchor = snapshot.anchor_after(point);
2265 Anchor::in_buffer(excerpt_id, snapshot.remote_id(), text_anchor)
2266 })
2267 }
2268
2269 pub fn remove_excerpts(
2270 &mut self,
2271 excerpt_ids: impl IntoIterator<Item = ExcerptId>,
2272 cx: &mut Context<Self>,
2273 ) {
2274 self.sync(cx);
2275 let ids = excerpt_ids.into_iter().collect::<Vec<_>>();
2276 if ids.is_empty() {
2277 return;
2278 }
2279
2280 let mut buffers = self.buffers.borrow_mut();
2281 let mut snapshot = self.snapshot.borrow_mut();
2282 let mut new_excerpts = SumTree::default();
2283 let mut cursor = snapshot
2284 .excerpts
2285 .cursor::<(Option<&Locator>, ExcerptOffset)>(&());
2286 let mut edits = Vec::new();
2287 let mut excerpt_ids = ids.iter().copied().peekable();
2288 let mut removed_buffer_ids = Vec::new();
2289
2290 while let Some(excerpt_id) = excerpt_ids.next() {
2291 self.paths_by_excerpt.remove(&excerpt_id);
2292 // Seek to the next excerpt to remove, preserving any preceding excerpts.
2293 let locator = snapshot.excerpt_locator_for_id(excerpt_id);
2294 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left, &()), &());
2295
2296 if let Some(mut excerpt) = cursor.item() {
2297 if excerpt.id != excerpt_id {
2298 continue;
2299 }
2300 let mut old_start = cursor.start().1;
2301
2302 // Skip over the removed excerpt.
2303 'remove_excerpts: loop {
2304 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
2305 buffer_state.excerpts.retain(|l| l != &excerpt.locator);
2306 if buffer_state.excerpts.is_empty() {
2307 log::debug!(
2308 "removing buffer and diff for buffer {}",
2309 excerpt.buffer_id
2310 );
2311 buffers.remove(&excerpt.buffer_id);
2312 removed_buffer_ids.push(excerpt.buffer_id);
2313 }
2314 }
2315 cursor.next(&());
2316
2317 // Skip over any subsequent excerpts that are also removed.
2318 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
2319 let next_locator = snapshot.excerpt_locator_for_id(next_excerpt_id);
2320 if let Some(next_excerpt) = cursor.item() {
2321 if next_excerpt.locator == *next_locator {
2322 excerpt_ids.next();
2323 excerpt = next_excerpt;
2324 continue 'remove_excerpts;
2325 }
2326 }
2327 }
2328
2329 break;
2330 }
2331
2332 // When removing the last excerpt, remove the trailing newline from
2333 // the previous excerpt.
2334 if cursor.item().is_none() && old_start.value > 0 {
2335 old_start.value -= 1;
2336 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
2337 }
2338
2339 // Push an edit for the removal of this run of excerpts.
2340 let old_end = cursor.start().1;
2341 let new_start = ExcerptOffset::new(new_excerpts.summary().text.len);
2342 edits.push(Edit {
2343 old: old_start..old_end,
2344 new: new_start..new_start,
2345 });
2346 }
2347 }
2348 let suffix = cursor.suffix(&());
2349 let changed_trailing_excerpt = suffix.is_empty();
2350 new_excerpts.append(suffix, &());
2351 drop(cursor);
2352 snapshot.excerpts = new_excerpts;
2353 for buffer_id in &removed_buffer_ids {
2354 self.diffs.remove(buffer_id);
2355 snapshot.diffs.remove(buffer_id);
2356 }
2357
2358 if changed_trailing_excerpt {
2359 snapshot.trailing_excerpt_update_count += 1;
2360 }
2361
2362 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2363 self.buffer_changed_since_sync.replace(true);
2364 cx.emit(Event::Edited {
2365 singleton_buffer_edited: false,
2366 edited_buffer: None,
2367 });
2368 cx.emit(Event::ExcerptsRemoved {
2369 ids,
2370 removed_buffer_ids,
2371 });
2372 cx.notify();
2373 }
2374
2375 pub fn wait_for_anchors<'a, Anchors: 'a + Iterator<Item = Anchor>>(
2376 &self,
2377 anchors: Anchors,
2378 cx: &mut Context<Self>,
2379 ) -> impl 'static + Future<Output = Result<()>> + use<Anchors> {
2380 let borrow = self.buffers.borrow();
2381 let mut error = None;
2382 let mut futures = Vec::new();
2383 for anchor in anchors {
2384 if let Some(buffer_id) = anchor.buffer_id {
2385 if let Some(buffer) = borrow.get(&buffer_id) {
2386 buffer.buffer.update(cx, |buffer, _| {
2387 futures.push(buffer.wait_for_anchors([anchor.text_anchor]))
2388 });
2389 } else {
2390 error = Some(anyhow!(
2391 "buffer {buffer_id} is not part of this multi-buffer"
2392 ));
2393 break;
2394 }
2395 }
2396 }
2397 async move {
2398 if let Some(error) = error {
2399 Err(error)?;
2400 }
2401 for future in futures {
2402 future.await?;
2403 }
2404 Ok(())
2405 }
2406 }
2407
2408 pub fn text_anchor_for_position<T: ToOffset>(
2409 &self,
2410 position: T,
2411 cx: &App,
2412 ) -> Option<(Entity<Buffer>, language::Anchor)> {
2413 let snapshot = self.read(cx);
2414 let anchor = snapshot.anchor_before(position);
2415 let buffer = self
2416 .buffers
2417 .borrow()
2418 .get(&anchor.buffer_id?)?
2419 .buffer
2420 .clone();
2421 Some((buffer, anchor.text_anchor))
2422 }
2423
2424 fn on_buffer_event(
2425 &mut self,
2426 buffer: Entity<Buffer>,
2427 event: &language::BufferEvent,
2428 cx: &mut Context<Self>,
2429 ) {
2430 cx.emit(match event {
2431 language::BufferEvent::Edited => Event::Edited {
2432 singleton_buffer_edited: true,
2433 edited_buffer: Some(buffer.clone()),
2434 },
2435 language::BufferEvent::DirtyChanged => Event::DirtyChanged,
2436 language::BufferEvent::Saved => Event::Saved,
2437 language::BufferEvent::FileHandleChanged => Event::FileHandleChanged,
2438 language::BufferEvent::Reloaded => Event::Reloaded,
2439 language::BufferEvent::ReloadNeeded => Event::ReloadNeeded,
2440 language::BufferEvent::LanguageChanged => {
2441 Event::LanguageChanged(buffer.read(cx).remote_id())
2442 }
2443 language::BufferEvent::Reparsed => Event::Reparsed(buffer.read(cx).remote_id()),
2444 language::BufferEvent::DiagnosticsUpdated => Event::DiagnosticsUpdated,
2445 language::BufferEvent::Closed => Event::Closed,
2446 language::BufferEvent::Discarded => Event::Discarded,
2447 language::BufferEvent::CapabilityChanged => {
2448 self.capability = buffer.read(cx).capability();
2449 Event::CapabilityChanged
2450 }
2451 language::BufferEvent::Operation { .. } => return,
2452 });
2453 }
2454
2455 fn buffer_diff_language_changed(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2456 self.sync(cx);
2457 let mut snapshot = self.snapshot.borrow_mut();
2458 let diff = diff.read(cx);
2459 let buffer_id = diff.buffer_id;
2460 let diff = diff.snapshot(cx);
2461 snapshot.diffs.insert(buffer_id, diff);
2462 }
2463
2464 fn buffer_diff_changed(
2465 &mut self,
2466 diff: Entity<BufferDiff>,
2467 range: Range<text::Anchor>,
2468 cx: &mut Context<Self>,
2469 ) {
2470 self.sync(cx);
2471 self.buffer_changed_since_sync.replace(true);
2472
2473 let diff = diff.read(cx);
2474 let buffer_id = diff.buffer_id;
2475 let buffers = self.buffers.borrow();
2476 let Some(buffer_state) = buffers.get(&buffer_id) else {
2477 return;
2478 };
2479
2480 let buffer = buffer_state.buffer.read(cx);
2481 let diff_change_range = range.to_offset(&buffer);
2482
2483 let new_diff = diff.snapshot(cx);
2484 let mut snapshot = self.snapshot.borrow_mut();
2485 let base_text_changed = snapshot
2486 .diffs
2487 .get(&buffer_id)
2488 .map_or(true, |old_diff| !new_diff.base_texts_eq(old_diff));
2489
2490 snapshot.diffs.insert(buffer_id, new_diff);
2491
2492 let mut excerpt_edits = Vec::new();
2493 for locator in &buffer_state.excerpts {
2494 let mut cursor = snapshot
2495 .excerpts
2496 .cursor::<(Option<&Locator>, ExcerptOffset)>(&());
2497 cursor.seek_forward(&Some(locator), Bias::Left, &());
2498 if let Some(excerpt) = cursor.item() {
2499 if excerpt.locator == *locator {
2500 let excerpt_buffer_range = excerpt.range.context.to_offset(&excerpt.buffer);
2501 if diff_change_range.end < excerpt_buffer_range.start
2502 || diff_change_range.start > excerpt_buffer_range.end
2503 {
2504 continue;
2505 }
2506 let excerpt_start = cursor.start().1;
2507 let excerpt_len = ExcerptOffset::new(excerpt.text_summary.len);
2508 let diff_change_start_in_excerpt = ExcerptOffset::new(
2509 diff_change_range
2510 .start
2511 .saturating_sub(excerpt_buffer_range.start),
2512 );
2513 let diff_change_end_in_excerpt = ExcerptOffset::new(
2514 diff_change_range
2515 .end
2516 .saturating_sub(excerpt_buffer_range.start),
2517 );
2518 let edit_start = excerpt_start + diff_change_start_in_excerpt.min(excerpt_len);
2519 let edit_end = excerpt_start + diff_change_end_in_excerpt.min(excerpt_len);
2520 excerpt_edits.push(Edit {
2521 old: edit_start..edit_end,
2522 new: edit_start..edit_end,
2523 });
2524 }
2525 }
2526 }
2527
2528 self.sync_diff_transforms(
2529 &mut snapshot,
2530 excerpt_edits,
2531 DiffChangeKind::DiffUpdated {
2532 base_changed: base_text_changed,
2533 },
2534 );
2535 cx.emit(Event::Edited {
2536 singleton_buffer_edited: false,
2537 edited_buffer: None,
2538 });
2539 }
2540
2541 pub fn all_buffers(&self) -> HashSet<Entity<Buffer>> {
2542 self.buffers
2543 .borrow()
2544 .values()
2545 .map(|state| state.buffer.clone())
2546 .collect()
2547 }
2548
2549 pub fn buffer(&self, buffer_id: BufferId) -> Option<Entity<Buffer>> {
2550 self.buffers
2551 .borrow()
2552 .get(&buffer_id)
2553 .map(|state| state.buffer.clone())
2554 }
2555
2556 pub fn language_at<T: ToOffset>(&self, point: T, cx: &App) -> Option<Arc<Language>> {
2557 self.point_to_buffer_offset(point, cx)
2558 .and_then(|(buffer, offset)| buffer.read(cx).language_at(offset))
2559 }
2560
2561 pub fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
2562 // let buffer_id = self
2563 // .snapshot
2564 // .borrow()
2565 // .excerpts
2566 // .first()
2567 // .map(|excerpt| excerpt.buffer.remote_id());
2568 // buffer_id
2569 // .and_then(|buffer_id| self.buffer(buffer_id))
2570 // .map(|buffer| {
2571 // let buffer = buffer.read(cx);
2572 // language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx)
2573 // })
2574 // .unwrap_or_else(move || self.language_settings_at(0, cx))
2575 todo!()
2576 }
2577
2578 pub fn language_settings_at<'a, T: ToOffset>(
2579 &'a self,
2580 point: T,
2581 cx: &'a App,
2582 ) -> Cow<'a, LanguageSettings> {
2583 let mut language = None;
2584 let mut file = None;
2585 if let Some((buffer, offset)) = self.point_to_buffer_offset(point, cx) {
2586 let buffer = buffer.read(cx);
2587 language = buffer.language_at(offset);
2588 file = buffer.file();
2589 }
2590 // language_settings(language.map(|l| l.name()), file, cx)
2591 todo!()
2592 }
2593
2594 pub fn for_each_buffer(&self, mut f: impl FnMut(&Entity<Buffer>)) {
2595 self.buffers
2596 .borrow()
2597 .values()
2598 .for_each(|state| f(&state.buffer))
2599 }
2600
2601 pub fn title<'a>(&'a self, cx: &'a App) -> Cow<'a, str> {
2602 // if let Some(title) = self.title.as_ref() {
2603 // return title.into();
2604 // }
2605
2606 // if let Some(buffer) = self.as_singleton() {
2607 // let buffer = buffer.read(cx);
2608
2609 // if let Some(file) = buffer.file() {
2610 // return file.file_name(cx).to_string_lossy();
2611 // }
2612
2613 // if let Some(title) = self.buffer_content_title(&buffer) {
2614 // return title;
2615 // }
2616 // };
2617
2618 // "untitled".into()
2619 todo!()
2620 }
2621
2622 fn buffer_content_title(&self, buffer: &Buffer) -> Option<Cow<'_, str>> {
2623 let mut is_leading_whitespace = true;
2624 let mut count = 0;
2625 let mut prev_was_space = false;
2626 let mut title = String::new();
2627
2628 for ch in buffer.snapshot().chars() {
2629 if is_leading_whitespace && ch.is_whitespace() {
2630 continue;
2631 }
2632
2633 is_leading_whitespace = false;
2634
2635 if ch == '\n' || count >= 40 {
2636 break;
2637 }
2638
2639 if ch.is_whitespace() {
2640 if !prev_was_space {
2641 title.push(' ');
2642 count += 1;
2643 prev_was_space = true;
2644 }
2645 } else {
2646 title.push(ch);
2647 count += 1;
2648 prev_was_space = false;
2649 }
2650 }
2651
2652 let title = title.trim_end().to_string();
2653
2654 if title.is_empty() {
2655 return None;
2656 }
2657
2658 Some(title.into())
2659 }
2660
2661 pub fn set_title(&mut self, title: String, cx: &mut Context<Self>) {
2662 self.title = Some(title);
2663 cx.notify();
2664 }
2665
2666 /// Preserve preview tabs containing this multibuffer until additional edits occur.
2667 pub fn refresh_preview(&self, cx: &mut Context<Self>) {
2668 for buffer_state in self.buffers.borrow().values() {
2669 buffer_state
2670 .buffer
2671 .update(cx, |buffer, _cx| buffer.refresh_preview());
2672 }
2673 }
2674
2675 /// Whether we should preserve the preview status of a tab containing this multi-buffer.
2676 pub fn preserve_preview(&self, cx: &App) -> bool {
2677 self.buffers
2678 .borrow()
2679 .values()
2680 .all(|state| state.buffer.read(cx).preserve_preview())
2681 }
2682
2683 #[cfg(any(test, feature = "test-support"))]
2684 pub fn is_parsing(&self, cx: &App) -> bool {
2685 self.as_singleton().unwrap().read(cx).is_parsing()
2686 }
2687
2688 pub fn add_diff(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2689 let buffer_id = diff.read(cx).buffer_id;
2690 self.buffer_diff_changed(diff.clone(), text::Anchor::MIN..text::Anchor::MAX, cx);
2691 self.diffs.insert(buffer_id, DiffState::new(diff, cx));
2692 }
2693
2694 pub fn diff_for(&self, buffer_id: BufferId) -> Option<Entity<BufferDiff>> {
2695 self.diffs.get(&buffer_id).map(|state| state.diff.clone())
2696 }
2697
2698 pub fn expand_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2699 self.expand_or_collapse_diff_hunks(ranges, true, cx);
2700 }
2701
2702 pub fn collapse_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2703 self.expand_or_collapse_diff_hunks(ranges, false, cx);
2704 }
2705
2706 pub fn set_all_diff_hunks_expanded(&mut self, cx: &mut Context<Self>) {
2707 self.snapshot.borrow_mut().all_diff_hunks_expanded = true;
2708 self.expand_or_collapse_diff_hunks(vec![Anchor::min()..Anchor::max()], true, cx);
2709 }
2710
2711 pub fn all_diff_hunks_expanded(&self) -> bool {
2712 self.snapshot.borrow().all_diff_hunks_expanded
2713 }
2714
2715 pub fn set_all_diff_hunks_collapsed(&mut self, cx: &mut Context<Self>) {
2716 self.snapshot.borrow_mut().all_diff_hunks_expanded = false;
2717 self.expand_or_collapse_diff_hunks(vec![Anchor::min()..Anchor::max()], false, cx);
2718 }
2719
2720 pub fn has_multiple_hunks(&self, cx: &App) -> bool {
2721 self.read(cx)
2722 .diff_hunks_in_range(Anchor::min()..Anchor::max())
2723 .nth(1)
2724 .is_some()
2725 }
2726
2727 pub fn single_hunk_is_expanded(&self, range: Range<Anchor>, cx: &App) -> bool {
2728 let snapshot = self.read(cx);
2729 let mut cursor = snapshot.diff_transforms.cursor::<usize>(&());
2730 let offset_range = range.to_offset(&snapshot);
2731 cursor.seek(&offset_range.start, Bias::Left, &());
2732 while let Some(item) = cursor.item() {
2733 if *cursor.start() >= offset_range.end && *cursor.start() > offset_range.start {
2734 break;
2735 }
2736 if item.hunk_info().is_some() {
2737 return true;
2738 }
2739 cursor.next(&());
2740 }
2741 false
2742 }
2743
2744 pub fn has_expanded_diff_hunks_in_ranges(&self, ranges: &[Range<Anchor>], cx: &App) -> bool {
2745 let snapshot = self.read(cx);
2746 let mut cursor = snapshot.diff_transforms.cursor::<usize>(&());
2747 for range in ranges {
2748 let range = range.to_point(&snapshot);
2749 let start = snapshot.point_to_offset(Point::new(range.start.row, 0));
2750 let end = snapshot.point_to_offset(Point::new(range.end.row + 1, 0));
2751 let start = start.saturating_sub(1);
2752 let end = snapshot.len().min(end + 1);
2753 cursor.seek(&start, Bias::Right, &());
2754 while let Some(item) = cursor.item() {
2755 if *cursor.start() >= end {
2756 break;
2757 }
2758 if item.hunk_info().is_some() {
2759 return true;
2760 }
2761 cursor.next(&());
2762 }
2763 }
2764 false
2765 }
2766
2767 pub fn expand_or_collapse_diff_hunks_inner(
2768 &mut self,
2769 ranges: impl IntoIterator<Item = (Range<Point>, ExcerptId)>,
2770 expand: bool,
2771 cx: &mut Context<Self>,
2772 ) {
2773 if self.snapshot.borrow().all_diff_hunks_expanded && !expand {
2774 return;
2775 }
2776 self.sync(cx);
2777 let mut snapshot = self.snapshot.borrow_mut();
2778 let mut excerpt_edits = Vec::new();
2779 let mut last_hunk_row = None;
2780 for (range, end_excerpt_id) in ranges {
2781 for diff_hunk in snapshot.diff_hunks_in_range(range) {
2782 if diff_hunk.excerpt_id.cmp(&end_excerpt_id, &snapshot).is_gt() {
2783 continue;
2784 }
2785 if last_hunk_row.map_or(false, |row| row >= diff_hunk.row_range.start) {
2786 continue;
2787 }
2788 let start = Anchor::in_buffer(
2789 diff_hunk.excerpt_id,
2790 diff_hunk.buffer_id,
2791 diff_hunk.buffer_range.start,
2792 );
2793 let end = Anchor::in_buffer(
2794 diff_hunk.excerpt_id,
2795 diff_hunk.buffer_id,
2796 diff_hunk.buffer_range.end,
2797 );
2798 let start = snapshot.excerpt_offset_for_anchor(&start);
2799 let end = snapshot.excerpt_offset_for_anchor(&end);
2800 last_hunk_row = Some(diff_hunk.row_range.start);
2801 excerpt_edits.push(text::Edit {
2802 old: start..end,
2803 new: start..end,
2804 });
2805 }
2806 }
2807
2808 self.sync_diff_transforms(
2809 &mut snapshot,
2810 excerpt_edits,
2811 DiffChangeKind::ExpandOrCollapseHunks { expand },
2812 );
2813 cx.emit(Event::DiffHunksToggled);
2814 cx.emit(Event::Edited {
2815 singleton_buffer_edited: false,
2816 edited_buffer: None,
2817 });
2818 }
2819
2820 pub fn expand_or_collapse_diff_hunks(
2821 &mut self,
2822 ranges: Vec<Range<Anchor>>,
2823 expand: bool,
2824 cx: &mut Context<Self>,
2825 ) {
2826 let snapshot = self.snapshot.borrow().clone();
2827 let ranges = ranges.iter().map(move |range| {
2828 let end_excerpt_id = range.end.excerpt_id;
2829 let range = range.to_point(&snapshot);
2830 let mut peek_end = range.end;
2831 if range.end.row < snapshot.max_row().0 {
2832 peek_end = Point::new(range.end.row + 1, 0);
2833 };
2834 (range.start..peek_end, end_excerpt_id)
2835 });
2836 self.expand_or_collapse_diff_hunks_inner(ranges, expand, cx);
2837 }
2838
2839 pub fn resize_excerpt(
2840 &mut self,
2841 id: ExcerptId,
2842 range: Range<text::Anchor>,
2843 cx: &mut Context<Self>,
2844 ) {
2845 self.sync(cx);
2846
2847 let mut snapshot = self.snapshot.borrow_mut();
2848 let locator = snapshot.excerpt_locator_for_id(id);
2849 let mut new_excerpts = SumTree::default();
2850 let mut cursor = snapshot
2851 .excerpts
2852 .cursor::<(Option<&Locator>, ExcerptOffset)>(&());
2853 let mut edits = Vec::<Edit<ExcerptOffset>>::new();
2854
2855 let prefix = cursor.slice(&Some(locator), Bias::Left, &());
2856 new_excerpts.append(prefix, &());
2857
2858 let mut excerpt = cursor.item().unwrap().clone();
2859 let old_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2860
2861 excerpt.range.context.start = range.start;
2862 excerpt.range.context.end = range.end;
2863 excerpt.max_buffer_row = range.end.to_point(&excerpt.buffer).row;
2864
2865 excerpt.text_summary = excerpt
2866 .buffer
2867 .text_summary_for_range(excerpt.range.context.clone());
2868
2869 let new_start_offset = ExcerptOffset::new(new_excerpts.summary().text.len);
2870 let old_start_offset = cursor.start().1;
2871 let new_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2872 let edit = Edit {
2873 old: old_start_offset..old_start_offset + old_text_len,
2874 new: new_start_offset..new_start_offset + new_text_len,
2875 };
2876
2877 if let Some(last_edit) = edits.last_mut() {
2878 if last_edit.old.end == edit.old.start {
2879 last_edit.old.end = edit.old.end;
2880 last_edit.new.end = edit.new.end;
2881 } else {
2882 edits.push(edit);
2883 }
2884 } else {
2885 edits.push(edit);
2886 }
2887
2888 new_excerpts.push(excerpt, &());
2889
2890 cursor.next(&());
2891
2892 new_excerpts.append(cursor.suffix(&()), &());
2893
2894 drop(cursor);
2895 snapshot.excerpts = new_excerpts;
2896
2897 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2898 cx.emit(Event::Edited {
2899 singleton_buffer_edited: false,
2900 edited_buffer: None,
2901 });
2902 cx.emit(Event::ExcerptsExpanded { ids: vec![id] });
2903 cx.notify();
2904 }
2905
2906 pub fn expand_excerpts(
2907 &mut self,
2908 ids: impl IntoIterator<Item = ExcerptId>,
2909 line_count: u32,
2910 direction: ExpandExcerptDirection,
2911 cx: &mut Context<Self>,
2912 ) {
2913 if line_count == 0 {
2914 return;
2915 }
2916 self.sync(cx);
2917 if !self.excerpts_by_path.is_empty() {
2918 self.expand_excerpts_with_paths(ids, line_count, direction, cx);
2919 return;
2920 }
2921 let mut snapshot = self.snapshot.borrow_mut();
2922
2923 let ids = ids.into_iter().collect::<Vec<_>>();
2924 let locators = snapshot.excerpt_locators_for_ids(ids.iter().copied());
2925 let mut new_excerpts = SumTree::default();
2926 let mut cursor = snapshot
2927 .excerpts
2928 .cursor::<(Option<&Locator>, ExcerptOffset)>(&());
2929 let mut edits = Vec::<Edit<ExcerptOffset>>::new();
2930
2931 for locator in &locators {
2932 let prefix = cursor.slice(&Some(locator), Bias::Left, &());
2933 new_excerpts.append(prefix, &());
2934
2935 let mut excerpt = cursor.item().unwrap().clone();
2936 let old_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2937
2938 let up_line_count = if direction.should_expand_up() {
2939 line_count
2940 } else {
2941 0
2942 };
2943
2944 let start_row = excerpt
2945 .range
2946 .context
2947 .start
2948 .to_point(&excerpt.buffer)
2949 .row
2950 .saturating_sub(up_line_count);
2951 let start_point = Point::new(start_row, 0);
2952 excerpt.range.context.start = excerpt.buffer.anchor_before(start_point);
2953
2954 let down_line_count = if direction.should_expand_down() {
2955 line_count
2956 } else {
2957 0
2958 };
2959
2960 let mut end_point = excerpt.buffer.clip_point(
2961 excerpt.range.context.end.to_point(&excerpt.buffer)
2962 + Point::new(down_line_count, 0),
2963 Bias::Left,
2964 );
2965 end_point.column = excerpt.buffer.line_len(end_point.row);
2966 excerpt.range.context.end = excerpt.buffer.anchor_after(end_point);
2967 excerpt.max_buffer_row = end_point.row;
2968
2969 excerpt.text_summary = excerpt
2970 .buffer
2971 .text_summary_for_range(excerpt.range.context.clone());
2972
2973 let new_start_offset = ExcerptOffset::new(new_excerpts.summary().text.len);
2974 let old_start_offset = cursor.start().1;
2975 let new_text_len = ExcerptOffset::new(excerpt.text_summary.len);
2976 let edit = Edit {
2977 old: old_start_offset..old_start_offset + old_text_len,
2978 new: new_start_offset..new_start_offset + new_text_len,
2979 };
2980
2981 if let Some(last_edit) = edits.last_mut() {
2982 if last_edit.old.end == edit.old.start {
2983 last_edit.old.end = edit.old.end;
2984 last_edit.new.end = edit.new.end;
2985 } else {
2986 edits.push(edit);
2987 }
2988 } else {
2989 edits.push(edit);
2990 }
2991
2992 new_excerpts.push(excerpt, &());
2993
2994 cursor.next(&());
2995 }
2996
2997 new_excerpts.append(cursor.suffix(&()), &());
2998
2999 drop(cursor);
3000 snapshot.excerpts = new_excerpts;
3001
3002 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
3003 cx.emit(Event::Edited {
3004 singleton_buffer_edited: false,
3005 edited_buffer: None,
3006 });
3007 cx.emit(Event::ExcerptsExpanded { ids });
3008 cx.notify();
3009 }
3010
3011 fn sync(&self, cx: &App) {
3012 let changed = self.buffer_changed_since_sync.replace(false);
3013 if !changed {
3014 return;
3015 }
3016
3017 let mut snapshot = self.snapshot.borrow_mut();
3018 let mut excerpts_to_edit = Vec::new();
3019 let mut non_text_state_updated = false;
3020 let mut is_dirty = false;
3021 let mut has_deleted_file = false;
3022 let mut has_conflict = false;
3023 let mut edited = false;
3024 let mut buffers = self.buffers.borrow_mut();
3025 for buffer_state in buffers.values_mut() {
3026 let buffer = buffer_state.buffer.read(cx);
3027 let version = buffer.version();
3028 let non_text_state_update_count = buffer.non_text_state_update_count();
3029
3030 let buffer_edited = version.changed_since(&buffer_state.last_version);
3031 let buffer_non_text_state_updated =
3032 non_text_state_update_count > buffer_state.last_non_text_state_update_count;
3033 if buffer_edited || buffer_non_text_state_updated {
3034 buffer_state.last_version = version;
3035 buffer_state.last_non_text_state_update_count = non_text_state_update_count;
3036 excerpts_to_edit.extend(
3037 buffer_state
3038 .excerpts
3039 .iter()
3040 .map(|locator| (locator, buffer_state.buffer.clone(), buffer_edited)),
3041 );
3042 }
3043
3044 edited |= buffer_edited;
3045 non_text_state_updated |= buffer_non_text_state_updated;
3046 is_dirty |= buffer.is_dirty();
3047 has_deleted_file |= buffer
3048 .file()
3049 .map_or(false, |file| file.disk_state() == DiskState::Deleted);
3050 has_conflict |= buffer.has_conflict();
3051 }
3052 if edited {
3053 snapshot.edit_count += 1;
3054 }
3055 if non_text_state_updated {
3056 snapshot.non_text_state_update_count += 1;
3057 }
3058 snapshot.is_dirty = is_dirty;
3059 snapshot.has_deleted_file = has_deleted_file;
3060 snapshot.has_conflict = has_conflict;
3061
3062 for (id, diff) in self.diffs.iter() {
3063 if snapshot.diffs.get(&id).is_none() {
3064 snapshot.diffs.insert(*id, diff.diff.read(cx).snapshot(cx));
3065 }
3066 }
3067
3068 excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);
3069
3070 let mut edits = Vec::new();
3071 let mut new_excerpts = SumTree::default();
3072 let mut cursor = snapshot
3073 .excerpts
3074 .cursor::<(Option<&Locator>, ExcerptOffset)>(&());
3075
3076 for (locator, buffer, buffer_edited) in excerpts_to_edit {
3077 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left, &()), &());
3078 let old_excerpt = cursor.item().unwrap();
3079 let buffer = buffer.read(cx);
3080 let buffer_id = buffer.remote_id();
3081
3082 let mut new_excerpt;
3083 if buffer_edited {
3084 edits.extend(
3085 buffer
3086 .edits_since_in_range::<usize>(
3087 old_excerpt.buffer.version(),
3088 old_excerpt.range.context.clone(),
3089 )
3090 .map(|edit| {
3091 let excerpt_old_start = cursor.start().1;
3092 let excerpt_new_start =
3093 ExcerptOffset::new(new_excerpts.summary().text.len);
3094 let old_start = excerpt_old_start + ExcerptOffset::new(edit.old.start);
3095 let old_end = excerpt_old_start + ExcerptOffset::new(edit.old.end);
3096 let new_start = excerpt_new_start + ExcerptOffset::new(edit.new.start);
3097 let new_end = excerpt_new_start + ExcerptOffset::new(edit.new.end);
3098 Edit {
3099 old: old_start..old_end,
3100 new: new_start..new_end,
3101 }
3102 }),
3103 );
3104
3105 new_excerpt = Excerpt::new(
3106 old_excerpt.id,
3107 locator.clone(),
3108 buffer_id,
3109 buffer.snapshot(),
3110 old_excerpt.range.clone(),
3111 old_excerpt.has_trailing_newline,
3112 );
3113 } else {
3114 new_excerpt = old_excerpt.clone();
3115 new_excerpt.buffer = buffer.snapshot();
3116 }
3117
3118 new_excerpts.push(new_excerpt, &());
3119 cursor.next(&());
3120 }
3121 new_excerpts.append(cursor.suffix(&()), &());
3122
3123 drop(cursor);
3124 snapshot.excerpts = new_excerpts;
3125
3126 self.sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
3127 }
3128
3129 fn sync_diff_transforms(
3130 &self,
3131 snapshot: &mut MultiBufferSnapshot,
3132 excerpt_edits: Vec<text::Edit<ExcerptOffset>>,
3133 change_kind: DiffChangeKind,
3134 ) {
3135 if excerpt_edits.is_empty() {
3136 return;
3137 }
3138
3139 let mut excerpts = snapshot.excerpts.cursor::<ExcerptOffset>(&());
3140 let mut old_diff_transforms = snapshot
3141 .diff_transforms
3142 .cursor::<(ExcerptOffset, usize)>(&());
3143 let mut new_diff_transforms = SumTree::default();
3144 let mut old_expanded_hunks = HashSet::default();
3145 let mut output_edits = Vec::new();
3146 let mut output_delta = 0_isize;
3147 let mut at_transform_boundary = true;
3148 let mut end_of_current_insert = None;
3149
3150 let mut excerpt_edits = excerpt_edits.into_iter().peekable();
3151 while let Some(edit) = excerpt_edits.next() {
3152 excerpts.seek_forward(&edit.new.start, Bias::Right, &());
3153 if excerpts.item().is_none() && *excerpts.start() == edit.new.start {
3154 excerpts.prev(&());
3155 }
3156
3157 // Keep any transforms that are before the edit.
3158 if at_transform_boundary {
3159 at_transform_boundary = false;
3160 let transforms_before_edit =
3161 old_diff_transforms.slice(&edit.old.start, Bias::Left, &());
3162 self.append_diff_transforms(&mut new_diff_transforms, transforms_before_edit);
3163 if let Some(transform) = old_diff_transforms.item() {
3164 if old_diff_transforms.end(&()).0 == edit.old.start
3165 && old_diff_transforms.start().0 < edit.old.start
3166 {
3167 self.push_diff_transform(&mut new_diff_transforms, transform.clone());
3168 old_diff_transforms.next(&());
3169 }
3170 }
3171 }
3172
3173 // Compute the start of the edit in output coordinates.
3174 let edit_start_overshoot = (edit.old.start - old_diff_transforms.start().0).value;
3175 let edit_old_start = old_diff_transforms.start().1 + edit_start_overshoot;
3176 let edit_new_start = (edit_old_start as isize + output_delta) as usize;
3177
3178 let changed_diff_hunks = self.recompute_diff_transforms_for_edit(
3179 &edit,
3180 &mut excerpts,
3181 &mut old_diff_transforms,
3182 &mut new_diff_transforms,
3183 &mut end_of_current_insert,
3184 &mut old_expanded_hunks,
3185 &snapshot,
3186 change_kind,
3187 );
3188
3189 // Compute the end of the edit in output coordinates.
3190 let edit_old_end_overshoot = edit.old.end - old_diff_transforms.start().0;
3191 let edit_new_end_overshoot = edit.new.end - new_diff_transforms.summary().excerpt_len();
3192 let edit_old_end = old_diff_transforms.start().1 + edit_old_end_overshoot.value;
3193 let edit_new_end =
3194 new_diff_transforms.summary().output.len + edit_new_end_overshoot.value;
3195 let output_edit = Edit {
3196 old: edit_old_start..edit_old_end,
3197 new: edit_new_start..edit_new_end,
3198 };
3199
3200 output_delta += (output_edit.new.end - output_edit.new.start) as isize;
3201 output_delta -= (output_edit.old.end - output_edit.old.start) as isize;
3202 if changed_diff_hunks || matches!(change_kind, DiffChangeKind::BufferEdited) {
3203 output_edits.push(output_edit);
3204 }
3205
3206 // If this is the last edit that intersects the current diff transform,
3207 // then recreate the content up to the end of this transform, to prepare
3208 // for reusing additional slices of the old transforms.
3209 if excerpt_edits.peek().map_or(true, |next_edit| {
3210 next_edit.old.start >= old_diff_transforms.end(&()).0
3211 }) {
3212 let keep_next_old_transform = (old_diff_transforms.start().0 >= edit.old.end)
3213 && match old_diff_transforms.item() {
3214 Some(DiffTransform::BufferContent {
3215 inserted_hunk_info: Some(hunk),
3216 ..
3217 }) => excerpts.item().is_some_and(|excerpt| {
3218 hunk.hunk_start_anchor.is_valid(&excerpt.buffer)
3219 }),
3220 _ => true,
3221 };
3222
3223 let mut excerpt_offset = edit.new.end;
3224 if !keep_next_old_transform {
3225 excerpt_offset += old_diff_transforms.end(&()).0 - edit.old.end;
3226 old_diff_transforms.next(&());
3227 }
3228
3229 old_expanded_hunks.clear();
3230 self.push_buffer_content_transform(
3231 &snapshot,
3232 &mut new_diff_transforms,
3233 excerpt_offset,
3234 end_of_current_insert,
3235 );
3236 at_transform_boundary = true;
3237 }
3238 }
3239
3240 // Keep any transforms that are after the last edit.
3241 self.append_diff_transforms(&mut new_diff_transforms, old_diff_transforms.suffix(&()));
3242
3243 // Ensure there's always at least one buffer content transform.
3244 if new_diff_transforms.is_empty() {
3245 new_diff_transforms.push(
3246 DiffTransform::BufferContent {
3247 summary: Default::default(),
3248 inserted_hunk_info: None,
3249 },
3250 &(),
3251 );
3252 }
3253
3254 self.subscriptions.publish(output_edits);
3255 drop(old_diff_transforms);
3256 drop(excerpts);
3257 snapshot.diff_transforms = new_diff_transforms;
3258 snapshot.edit_count += 1;
3259
3260 #[cfg(any(test, feature = "test-support"))]
3261 snapshot.check_invariants();
3262 }
3263
3264 fn recompute_diff_transforms_for_edit(
3265 &self,
3266 edit: &Edit<TypedOffset<Excerpt>>,
3267 excerpts: &mut Cursor<Excerpt, TypedOffset<Excerpt>>,
3268 old_diff_transforms: &mut Cursor<DiffTransform, (TypedOffset<Excerpt>, usize)>,
3269 new_diff_transforms: &mut SumTree<DiffTransform>,
3270 end_of_current_insert: &mut Option<(TypedOffset<Excerpt>, DiffTransformHunkInfo)>,
3271 old_expanded_hunks: &mut HashSet<DiffTransformHunkInfo>,
3272 snapshot: &MultiBufferSnapshot,
3273 change_kind: DiffChangeKind,
3274 ) -> bool {
3275 log::trace!(
3276 "recomputing diff transform for edit {:?} => {:?}",
3277 edit.old.start.value..edit.old.end.value,
3278 edit.new.start.value..edit.new.end.value
3279 );
3280
3281 // Record which hunks were previously expanded.
3282 while let Some(item) = old_diff_transforms.item() {
3283 if let Some(hunk_info) = item.hunk_info() {
3284 log::trace!(
3285 "previously expanded hunk at {}",
3286 old_diff_transforms.start().0
3287 );
3288 old_expanded_hunks.insert(hunk_info);
3289 }
3290 if old_diff_transforms.end(&()).0 > edit.old.end {
3291 break;
3292 }
3293 old_diff_transforms.next(&());
3294 }
3295
3296 // Avoid querying diff hunks if there's no possibility of hunks being expanded.
3297 let all_diff_hunks_expanded = snapshot.all_diff_hunks_expanded;
3298 if old_expanded_hunks.is_empty()
3299 && change_kind == DiffChangeKind::BufferEdited
3300 && !all_diff_hunks_expanded
3301 {
3302 return false;
3303 }
3304
3305 // Visit each excerpt that intersects the edit.
3306 let mut did_expand_hunks = false;
3307 while let Some(excerpt) = excerpts.item() {
3308 // Recompute the expanded hunks in the portion of the excerpt that
3309 // intersects the edit.
3310 if let Some(diff) = snapshot.diffs.get(&excerpt.buffer_id) {
3311 let buffer = &excerpt.buffer;
3312 let excerpt_start = *excerpts.start();
3313 let excerpt_end = excerpt_start + ExcerptOffset::new(excerpt.text_summary.len);
3314 let excerpt_buffer_start = excerpt.range.context.start.to_offset(buffer);
3315 let excerpt_buffer_end = excerpt_buffer_start + excerpt.text_summary.len;
3316 let edit_buffer_start =
3317 excerpt_buffer_start + edit.new.start.value.saturating_sub(excerpt_start.value);
3318 let edit_buffer_end =
3319 excerpt_buffer_start + edit.new.end.value.saturating_sub(excerpt_start.value);
3320 let edit_buffer_end = edit_buffer_end.min(excerpt_buffer_end);
3321 let edit_anchor_range =
3322 buffer.anchor_before(edit_buffer_start)..buffer.anchor_after(edit_buffer_end);
3323
3324 for hunk in diff.hunks_intersecting_range(edit_anchor_range, buffer) {
3325 if hunk.is_created_file() && !all_diff_hunks_expanded {
3326 continue;
3327 }
3328
3329 let hunk_buffer_range = hunk.buffer_range.to_offset(buffer);
3330 if hunk_buffer_range.start < excerpt_buffer_start {
3331 log::trace!("skipping hunk that starts before excerpt");
3332 continue;
3333 }
3334
3335 let hunk_info = DiffTransformHunkInfo {
3336 excerpt_id: excerpt.id,
3337 hunk_start_anchor: hunk.buffer_range.start,
3338 hunk_secondary_status: hunk.secondary_status,
3339 };
3340
3341 let hunk_excerpt_start = excerpt_start
3342 + ExcerptOffset::new(
3343 hunk_buffer_range.start.saturating_sub(excerpt_buffer_start),
3344 );
3345 let hunk_excerpt_end = excerpt_end.min(
3346 excerpt_start
3347 + ExcerptOffset::new(hunk_buffer_range.end - excerpt_buffer_start),
3348 );
3349
3350 self.push_buffer_content_transform(
3351 snapshot,
3352 new_diff_transforms,
3353 hunk_excerpt_start,
3354 *end_of_current_insert,
3355 );
3356
3357 // For every existing hunk, determine if it was previously expanded
3358 // and if it should currently be expanded.
3359 let was_previously_expanded = old_expanded_hunks.contains(&hunk_info);
3360 let should_expand_hunk = match &change_kind {
3361 DiffChangeKind::DiffUpdated { base_changed: true } => {
3362 was_previously_expanded || all_diff_hunks_expanded
3363 }
3364 DiffChangeKind::ExpandOrCollapseHunks { expand } => {
3365 let intersects = hunk_buffer_range.is_empty()
3366 || hunk_buffer_range.end > edit_buffer_start;
3367 if *expand {
3368 intersects || was_previously_expanded || all_diff_hunks_expanded
3369 } else {
3370 !intersects && (was_previously_expanded || all_diff_hunks_expanded)
3371 }
3372 }
3373 _ => was_previously_expanded || all_diff_hunks_expanded,
3374 };
3375
3376 if should_expand_hunk {
3377 did_expand_hunks = true;
3378 log::trace!(
3379 "expanding hunk {:?}, excerpt:{:?}",
3380 hunk_excerpt_start.value..hunk_excerpt_end.value,
3381 excerpt.id
3382 );
3383
3384 if !hunk.diff_base_byte_range.is_empty()
3385 && hunk_buffer_range.start >= edit_buffer_start
3386 && hunk_buffer_range.start <= excerpt_buffer_end
3387 {
3388 let base_text = diff.base_text();
3389 let mut text_cursor =
3390 base_text.as_rope().cursor(hunk.diff_base_byte_range.start);
3391 let mut base_text_summary =
3392 text_cursor.summary::<TextSummary>(hunk.diff_base_byte_range.end);
3393
3394 let mut has_trailing_newline = false;
3395 if base_text_summary.last_line_chars > 0 {
3396 base_text_summary += TextSummary::newline();
3397 has_trailing_newline = true;
3398 }
3399
3400 new_diff_transforms.push(
3401 DiffTransform::DeletedHunk {
3402 base_text_byte_range: hunk.diff_base_byte_range.clone(),
3403 summary: base_text_summary,
3404 buffer_id: excerpt.buffer_id,
3405 hunk_info,
3406 has_trailing_newline,
3407 },
3408 &(),
3409 );
3410 }
3411
3412 if !hunk_buffer_range.is_empty() {
3413 *end_of_current_insert =
3414 Some((hunk_excerpt_end.min(excerpt_end), hunk_info));
3415 }
3416 }
3417 }
3418 }
3419
3420 if excerpts.end(&()) <= edit.new.end {
3421 excerpts.next(&());
3422 } else {
3423 break;
3424 }
3425 }
3426
3427 did_expand_hunks || !old_expanded_hunks.is_empty()
3428 }
3429
3430 fn append_diff_transforms(
3431 &self,
3432 new_transforms: &mut SumTree<DiffTransform>,
3433 subtree: SumTree<DiffTransform>,
3434 ) {
3435 if let Some(DiffTransform::BufferContent {
3436 inserted_hunk_info,
3437 summary,
3438 }) = subtree.first()
3439 {
3440 if self.extend_last_buffer_content_transform(
3441 new_transforms,
3442 *inserted_hunk_info,
3443 *summary,
3444 ) {
3445 let mut cursor = subtree.cursor::<()>(&());
3446 cursor.next(&());
3447 cursor.next(&());
3448 new_transforms.append(cursor.suffix(&()), &());
3449 return;
3450 }
3451 }
3452 new_transforms.append(subtree, &());
3453 }
3454
3455 fn push_diff_transform(
3456 &self,
3457 new_transforms: &mut SumTree<DiffTransform>,
3458 transform: DiffTransform,
3459 ) {
3460 if let DiffTransform::BufferContent {
3461 inserted_hunk_info: inserted_hunk_anchor,
3462 summary,
3463 } = transform
3464 {
3465 if self.extend_last_buffer_content_transform(
3466 new_transforms,
3467 inserted_hunk_anchor,
3468 summary,
3469 ) {
3470 return;
3471 }
3472 }
3473 new_transforms.push(transform, &());
3474 }
3475
3476 fn push_buffer_content_transform(
3477 &self,
3478 old_snapshot: &MultiBufferSnapshot,
3479 new_transforms: &mut SumTree<DiffTransform>,
3480 end_offset: ExcerptOffset,
3481 current_inserted_hunk: Option<(ExcerptOffset, DiffTransformHunkInfo)>,
3482 ) {
3483 let inserted_region = current_inserted_hunk.map(|(insertion_end_offset, hunk_info)| {
3484 (end_offset.min(insertion_end_offset), Some(hunk_info))
3485 });
3486 let unchanged_region = [(end_offset, None)];
3487
3488 for (end_offset, inserted_hunk_info) in inserted_region.into_iter().chain(unchanged_region)
3489 {
3490 let start_offset = new_transforms.summary().excerpt_len();
3491 if end_offset <= start_offset {
3492 continue;
3493 }
3494 let summary_to_add = old_snapshot
3495 .text_summary_for_excerpt_offset_range::<TextSummary>(start_offset..end_offset);
3496
3497 if !self.extend_last_buffer_content_transform(
3498 new_transforms,
3499 inserted_hunk_info,
3500 summary_to_add,
3501 ) {
3502 new_transforms.push(
3503 DiffTransform::BufferContent {
3504 summary: summary_to_add,
3505 inserted_hunk_info,
3506 },
3507 &(),
3508 )
3509 }
3510 }
3511 }
3512
3513 fn extend_last_buffer_content_transform(
3514 &self,
3515 new_transforms: &mut SumTree<DiffTransform>,
3516 new_inserted_hunk_info: Option<DiffTransformHunkInfo>,
3517 summary_to_add: TextSummary,
3518 ) -> bool {
3519 let mut did_extend = false;
3520 new_transforms.update_last(
3521 |last_transform| {
3522 if let DiffTransform::BufferContent {
3523 summary,
3524 inserted_hunk_info: inserted_hunk_anchor,
3525 } = last_transform
3526 {
3527 if *inserted_hunk_anchor == new_inserted_hunk_info {
3528 *summary += summary_to_add;
3529 did_extend = true;
3530 }
3531 }
3532 },
3533 &(),
3534 );
3535 did_extend
3536 }
3537}
3538
3539fn build_excerpt_ranges(
3540 ranges: impl IntoIterator<Item = Range<Point>>,
3541 context_line_count: u32,
3542 buffer_snapshot: &BufferSnapshot,
3543) -> Vec<ExcerptRange<Point>> {
3544 ranges
3545 .into_iter()
3546 .map(|range| {
3547 let start_row = range.start.row.saturating_sub(context_line_count);
3548 let start = Point::new(start_row, 0);
3549 let end_row = (range.end.row + context_line_count).min(buffer_snapshot.max_point().row);
3550 let end = Point::new(end_row, buffer_snapshot.line_len(end_row));
3551 ExcerptRange {
3552 context: start..end,
3553 primary: range,
3554 }
3555 })
3556 .collect()
3557}
3558
3559#[cfg(any(test, feature = "test-support"))]
3560impl MultiBuffer {
3561 pub fn build_simple(text: &str, cx: &mut gpui::App) -> Entity<Self> {
3562 let buffer = cx.new(|cx| Buffer::local(text, cx));
3563 cx.new(|cx| Self::singleton(buffer, cx))
3564 }
3565
3566 pub fn build_multi<const COUNT: usize>(
3567 excerpts: [(&str, Vec<Range<Point>>); COUNT],
3568 cx: &mut gpui::App,
3569 ) -> Entity<Self> {
3570 let multi = cx.new(|_| Self::new(Capability::ReadWrite));
3571 for (text, ranges) in excerpts {
3572 let buffer = cx.new(|cx| Buffer::local(text, cx));
3573 let excerpt_ranges = ranges
3574 .into_iter()
3575 .map(|range| ExcerptRange::new(range.clone()));
3576 multi.update(cx, |multi, cx| {
3577 multi.push_excerpts(buffer, excerpt_ranges, cx)
3578 });
3579 }
3580
3581 multi
3582 }
3583
3584 pub fn build_from_buffer(buffer: Entity<Buffer>, cx: &mut gpui::App) -> Entity<Self> {
3585 cx.new(|cx| Self::singleton(buffer, cx))
3586 }
3587
3588 pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::App) -> Entity<Self> {
3589 cx.new(|cx| {
3590 let mut multibuffer = MultiBuffer::new(Capability::ReadWrite);
3591 let mutation_count = rng.gen_range(1..=5);
3592 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
3593 multibuffer
3594 })
3595 }
3596
3597 pub fn randomly_edit(
3598 &mut self,
3599 rng: &mut impl rand::Rng,
3600 edit_count: usize,
3601 cx: &mut Context<Self>,
3602 ) {
3603 use util::RandomCharIter;
3604
3605 let snapshot = self.read(cx);
3606 let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
3607 let mut last_end = None;
3608 for _ in 0..edit_count {
3609 if last_end.map_or(false, |last_end| last_end >= snapshot.len()) {
3610 break;
3611 }
3612
3613 let new_start = last_end.map_or(0, |last_end| last_end + 1);
3614 let end = snapshot.clip_offset(rng.gen_range(new_start..=snapshot.len()), Bias::Right);
3615 let start = snapshot.clip_offset(rng.gen_range(new_start..=end), Bias::Right);
3616 last_end = Some(end);
3617
3618 let mut range = start..end;
3619 if rng.gen_bool(0.2) {
3620 mem::swap(&mut range.start, &mut range.end);
3621 }
3622
3623 let new_text_len = rng.gen_range(0..10);
3624 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
3625
3626 edits.push((range, new_text.into()));
3627 }
3628 log::info!("mutating multi-buffer with {:?}", edits);
3629 drop(snapshot);
3630
3631 self.edit(edits, None, cx);
3632 }
3633
3634 pub fn randomly_edit_excerpts(
3635 &mut self,
3636 rng: &mut impl rand::Rng,
3637 mutation_count: usize,
3638 cx: &mut Context<Self>,
3639 ) {
3640 use rand::prelude::*;
3641 use std::env;
3642 use util::RandomCharIter;
3643
3644 let max_excerpts = env::var("MAX_EXCERPTS")
3645 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
3646 .unwrap_or(5);
3647
3648 let mut buffers = Vec::new();
3649 for _ in 0..mutation_count {
3650 if rng.gen_bool(0.05) {
3651 log::info!("Clearing multi-buffer");
3652 self.clear(cx);
3653 continue;
3654 } else if rng.gen_bool(0.1) && !self.excerpt_ids().is_empty() {
3655 let ids = self.excerpt_ids();
3656 let mut excerpts = HashSet::default();
3657 for _ in 0..rng.gen_range(0..ids.len()) {
3658 excerpts.extend(ids.choose(rng).copied());
3659 }
3660
3661 let line_count = rng.gen_range(0..5);
3662
3663 log::info!("Expanding excerpts {excerpts:?} by {line_count} lines");
3664
3665 self.expand_excerpts(
3666 excerpts.iter().cloned(),
3667 line_count,
3668 ExpandExcerptDirection::UpAndDown,
3669 cx,
3670 );
3671 continue;
3672 }
3673
3674 let excerpt_ids = self.excerpt_ids();
3675 if excerpt_ids.is_empty() || (rng.r#gen() && excerpt_ids.len() < max_excerpts) {
3676 let buffer_handle = if rng.r#gen() || self.buffers.borrow().is_empty() {
3677 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
3678 buffers.push(cx.new(|cx| Buffer::local(text, cx)));
3679 let buffer = buffers.last().unwrap().read(cx);
3680 log::info!(
3681 "Creating new buffer {} with text: {:?}",
3682 buffer.remote_id(),
3683 buffer.text()
3684 );
3685 buffers.last().unwrap().clone()
3686 } else {
3687 self.buffers
3688 .borrow()
3689 .values()
3690 .choose(rng)
3691 .unwrap()
3692 .buffer
3693 .clone()
3694 };
3695
3696 let buffer = buffer_handle.read(cx);
3697 let buffer_text = buffer.text();
3698 let ranges = (0..rng.gen_range(0..5))
3699 .map(|_| {
3700 let end_ix =
3701 buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
3702 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
3703 ExcerptRange::new(start_ix..end_ix)
3704 })
3705 .collect::<Vec<_>>();
3706 log::info!(
3707 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
3708 buffer_handle.read(cx).remote_id(),
3709 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
3710 ranges
3711 .iter()
3712 .map(|r| &buffer_text[r.context.clone()])
3713 .collect::<Vec<_>>()
3714 );
3715
3716 let excerpt_id = self.push_excerpts(buffer_handle.clone(), ranges, cx);
3717 log::info!("Inserted with ids: {:?}", excerpt_id);
3718 } else {
3719 let remove_count = rng.gen_range(1..=excerpt_ids.len());
3720 let mut excerpts_to_remove = excerpt_ids
3721 .choose_multiple(rng, remove_count)
3722 .cloned()
3723 .collect::<Vec<_>>();
3724 let snapshot = self.snapshot.borrow();
3725 excerpts_to_remove.sort_unstable_by(|a, b| a.cmp(b, &snapshot));
3726 drop(snapshot);
3727 log::info!("Removing excerpts {:?}", excerpts_to_remove);
3728 self.remove_excerpts(excerpts_to_remove, cx);
3729 }
3730 }
3731 }
3732
3733 pub fn randomly_mutate(
3734 &mut self,
3735 rng: &mut impl rand::Rng,
3736 mutation_count: usize,
3737 cx: &mut Context<Self>,
3738 ) {
3739 use rand::prelude::*;
3740
3741 if rng.gen_bool(0.7) || self.singleton {
3742 let buffer = self
3743 .buffers
3744 .borrow()
3745 .values()
3746 .choose(rng)
3747 .map(|state| state.buffer.clone());
3748
3749 if let Some(buffer) = buffer {
3750 buffer.update(cx, |buffer, cx| {
3751 if rng.r#gen() {
3752 buffer.randomly_edit(rng, mutation_count, cx);
3753 } else {
3754 buffer.randomly_undo_redo(rng, cx);
3755 }
3756 });
3757 } else {
3758 self.randomly_edit(rng, mutation_count, cx);
3759 }
3760 } else {
3761 self.randomly_edit_excerpts(rng, mutation_count, cx);
3762 }
3763
3764 self.check_invariants(cx);
3765 }
3766
3767 fn check_invariants(&self, cx: &App) {
3768 self.read(cx).check_invariants();
3769 }
3770}
3771
3772impl EventEmitter<Event> for MultiBuffer {}
3773
3774impl MultiBufferSnapshot {
3775 pub fn text(&self) -> String {
3776 self.chunks(0..self.len(), false)
3777 .map(|chunk| chunk.text)
3778 .collect()
3779 }
3780
3781 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3782 self.reversed_chunks_in_range(0..position.to_offset(self))
3783 .flat_map(|c| c.chars().rev())
3784 }
3785
3786 fn reversed_chunks_in_range(&self, range: Range<usize>) -> ReversedMultiBufferChunks<'_> {
3787 let mut cursor = self.cursor::<usize>();
3788 cursor.seek(&range.end);
3789 let current_chunks = cursor.region().as_ref().map(|region| {
3790 let start_overshoot = range.start.saturating_sub(region.range.start);
3791 let end_overshoot = range.end - region.range.start;
3792 let end = (region.buffer_range.start + end_overshoot).min(region.buffer_range.end);
3793 let start = region.buffer_range.start + start_overshoot;
3794 region.buffer.reversed_chunks_in_range(start..end)
3795 });
3796 ReversedMultiBufferChunks {
3797 cursor,
3798 current_chunks,
3799 start: range.start,
3800 offset: range.end,
3801 }
3802 }
3803
3804 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3805 let offset = position.to_offset(self);
3806 self.text_for_range(offset..self.len())
3807 .flat_map(|chunk| chunk.chars())
3808 }
3809
3810 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
3811 self.chunks(range, false).map(|chunk| chunk.text)
3812 }
3813
3814 pub fn is_line_blank(&self, row: MultiBufferRow) -> bool {
3815 self.text_for_range(Point::new(row.0, 0)..Point::new(row.0, self.line_len(row)))
3816 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
3817 }
3818
3819 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
3820 where
3821 T: ToOffset,
3822 {
3823 let position = position.to_offset(self);
3824 position == self.clip_offset(position, Bias::Left)
3825 && self
3826 .bytes_in_range(position..self.len())
3827 .flatten()
3828 .copied()
3829 .take(needle.len())
3830 .eq(needle.bytes())
3831 }
3832
3833 pub fn diff_hunks(&self) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3834 self.diff_hunks_in_range(Anchor::min()..Anchor::max())
3835 }
3836
3837 pub fn diff_hunks_in_range<T: ToPoint>(
3838 &self,
3839 range: Range<T>,
3840 ) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3841 let query_range = range.start.to_point(self)..range.end.to_point(self);
3842 self.lift_buffer_metadata(query_range.clone(), move |buffer, buffer_range| {
3843 let diff = self.diffs.get(&buffer.remote_id())?;
3844 let buffer_start = buffer.anchor_before(buffer_range.start);
3845 let buffer_end = buffer.anchor_after(buffer_range.end);
3846 Some(
3847 diff.hunks_intersecting_range(buffer_start..buffer_end, buffer)
3848 .filter_map(|hunk| {
3849 if hunk.is_created_file() && !self.all_diff_hunks_expanded {
3850 return None;
3851 }
3852 Some((hunk.range.clone(), hunk))
3853 }),
3854 )
3855 })
3856 .filter_map(move |(range, hunk, excerpt)| {
3857 if range.start != range.end && range.end == query_range.start && !hunk.range.is_empty()
3858 {
3859 return None;
3860 }
3861 let end_row = if range.end.column == 0 {
3862 range.end.row
3863 } else {
3864 range.end.row + 1
3865 };
3866 Some(MultiBufferDiffHunk {
3867 row_range: MultiBufferRow(range.start.row)..MultiBufferRow(end_row),
3868 buffer_id: excerpt.buffer_id,
3869 excerpt_id: excerpt.id,
3870 buffer_range: hunk.buffer_range.clone(),
3871 diff_base_byte_range: hunk.diff_base_byte_range.clone(),
3872 secondary_status: hunk.secondary_status,
3873 })
3874 })
3875 }
3876
3877 pub fn excerpt_ids_for_range<T: ToOffset>(
3878 &self,
3879 range: Range<T>,
3880 ) -> impl Iterator<Item = ExcerptId> + '_ {
3881 let range = range.start.to_offset(self)..range.end.to_offset(self);
3882 let mut cursor = self.cursor::<usize>();
3883 cursor.seek(&range.start);
3884 std::iter::from_fn(move || {
3885 let region = cursor.region()?;
3886 if region.range.start >= range.end {
3887 return None;
3888 }
3889 cursor.next_excerpt();
3890 Some(region.excerpt.id)
3891 })
3892 }
3893
3894 pub fn buffer_ids_for_range<T: ToOffset>(
3895 &self,
3896 range: Range<T>,
3897 ) -> impl Iterator<Item = BufferId> + '_ {
3898 let range = range.start.to_offset(self)..range.end.to_offset(self);
3899 let mut cursor = self.cursor::<usize>();
3900 cursor.seek(&range.start);
3901 std::iter::from_fn(move || {
3902 let region = cursor.region()?;
3903 if region.range.start > range.end
3904 || region.range.start == range.end && region.range.start > range.start
3905 {
3906 return None;
3907 }
3908 cursor.next_excerpt();
3909 Some(region.excerpt.buffer_id)
3910 })
3911 }
3912
3913 pub fn ranges_to_buffer_ranges<T: ToOffset>(
3914 &self,
3915 ranges: impl Iterator<Item = Range<T>>,
3916 ) -> impl Iterator<Item = (&BufferSnapshot, Range<usize>, ExcerptId)> {
3917 ranges.flat_map(|range| self.range_to_buffer_ranges(range).into_iter())
3918 }
3919
3920 pub fn range_to_buffer_ranges<T: ToOffset>(
3921 &self,
3922 range: Range<T>,
3923 ) -> Vec<(&BufferSnapshot, Range<usize>, ExcerptId)> {
3924 let start = range.start.to_offset(&self);
3925 let end = range.end.to_offset(&self);
3926
3927 let mut cursor = self.cursor::<usize>();
3928 cursor.seek(&start);
3929
3930 let mut result: Vec<(&BufferSnapshot, Range<usize>, ExcerptId)> = Vec::new();
3931 while let Some(region) = cursor.region() {
3932 if region.range.start > end {
3933 break;
3934 }
3935 if region.is_main_buffer {
3936 let start_overshoot = start.saturating_sub(region.range.start);
3937 let end_overshoot = end.saturating_sub(region.range.start);
3938 let start = region
3939 .buffer_range
3940 .end
3941 .min(region.buffer_range.start + start_overshoot);
3942 let end = region
3943 .buffer_range
3944 .end
3945 .min(region.buffer_range.start + end_overshoot);
3946 if let Some(prev) = result.last_mut().filter(|(_, prev_range, excerpt_id)| {
3947 *excerpt_id == region.excerpt.id && prev_range.end == start
3948 }) {
3949 prev.1.end = end;
3950 } else {
3951 result.push((region.buffer, start..end, region.excerpt.id));
3952 }
3953 }
3954 cursor.next();
3955 }
3956 result
3957 }
3958
3959 pub fn range_to_buffer_ranges_with_deleted_hunks<T: ToOffset>(
3960 &self,
3961 range: Range<T>,
3962 ) -> impl Iterator<Item = (&BufferSnapshot, Range<usize>, ExcerptId, Option<Anchor>)> + '_ {
3963 let start = range.start.to_offset(&self);
3964 let end = range.end.to_offset(&self);
3965
3966 let mut cursor = self.cursor::<usize>();
3967 cursor.seek(&start);
3968
3969 std::iter::from_fn(move || {
3970 let region = cursor.region()?;
3971 if region.range.start > end {
3972 return None;
3973 }
3974 let start_overshoot = start.saturating_sub(region.range.start);
3975 let end_overshoot = end.saturating_sub(region.range.start);
3976 let start = region
3977 .buffer_range
3978 .end
3979 .min(region.buffer_range.start + start_overshoot);
3980 let end = region
3981 .buffer_range
3982 .end
3983 .min(region.buffer_range.start + end_overshoot);
3984
3985 let region_excerpt_id = region.excerpt.id;
3986 let deleted_hunk_anchor = if region.is_main_buffer {
3987 None
3988 } else {
3989 Some(self.anchor_before(region.range.start))
3990 };
3991 let result = (
3992 region.buffer,
3993 start..end,
3994 region_excerpt_id,
3995 deleted_hunk_anchor,
3996 );
3997 cursor.next();
3998 Some(result)
3999 })
4000 }
4001
4002 /// Retrieves buffer metadata for the given range, and converts it into multi-buffer
4003 /// coordinates.
4004 ///
4005 /// The given callback will be called for every excerpt intersecting the given range. It will
4006 /// be passed the excerpt's buffer and the buffer range that the input range intersects.
4007 /// The callback should return an iterator of metadata items from that buffer, each paired
4008 /// with a buffer range.
4009 ///
4010 /// The returned iterator yields each of these metadata items, paired with its range in
4011 /// multi-buffer coordinates.
4012 fn lift_buffer_metadata<'a, D, M, I>(
4013 &'a self,
4014 query_range: Range<D>,
4015 get_buffer_metadata: impl 'a + Fn(&'a BufferSnapshot, Range<D>) -> Option<I>,
4016 ) -> impl Iterator<Item = (Range<D>, M, &'a Excerpt)> + 'a
4017 where
4018 I: Iterator<Item = (Range<D>, M)> + 'a,
4019 D: TextDimension + Ord + Sub<D, Output = D>,
4020 {
4021 let max_position = D::from_text_summary(&self.text_summary());
4022 let mut current_excerpt_metadata: Option<(ExcerptId, I)> = None;
4023 let mut cursor = self.cursor::<D>();
4024
4025 // Find the excerpt and buffer offset where the given range ends.
4026 cursor.seek(&query_range.end);
4027 let mut range_end = None;
4028 while let Some(region) = cursor.region() {
4029 if region.is_main_buffer {
4030 let mut buffer_end = region.buffer_range.start;
4031 let overshoot = if query_range.end > region.range.start {
4032 query_range.end - region.range.start
4033 } else {
4034 D::default()
4035 };
4036 buffer_end.add_assign(&overshoot);
4037 range_end = Some((region.excerpt.id, buffer_end));
4038 break;
4039 }
4040 cursor.next();
4041 }
4042
4043 cursor.seek(&query_range.start);
4044
4045 if let Some(region) = cursor.region().filter(|region| !region.is_main_buffer) {
4046 if region.range.start > D::zero(&()) {
4047 cursor.prev()
4048 }
4049 }
4050
4051 iter::from_fn(move || {
4052 loop {
4053 let excerpt = cursor.excerpt()?;
4054
4055 // If we have already retrieved metadata for this excerpt, continue to use it.
4056 let metadata_iter = if let Some((_, metadata)) = current_excerpt_metadata
4057 .as_mut()
4058 .filter(|(excerpt_id, _)| *excerpt_id == excerpt.id)
4059 {
4060 Some(metadata)
4061 }
4062 // Otherwise, compute the intersection of the input range with the excerpt's range,
4063 // and retrieve the metadata for the resulting range.
4064 else {
4065 let region = cursor.region()?;
4066 let mut buffer_start;
4067 if region.is_main_buffer {
4068 buffer_start = region.buffer_range.start;
4069 if query_range.start > region.range.start {
4070 let overshoot = query_range.start - region.range.start;
4071 buffer_start.add_assign(&overshoot);
4072 }
4073 buffer_start = buffer_start.min(region.buffer_range.end);
4074 } else {
4075 buffer_start = cursor.main_buffer_position()?;
4076 };
4077 let mut buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
4078 if let Some((end_excerpt_id, end_buffer_offset)) = range_end {
4079 if excerpt.id == end_excerpt_id {
4080 buffer_end = buffer_end.min(end_buffer_offset);
4081 }
4082 }
4083
4084 if let Some(iterator) =
4085 get_buffer_metadata(&excerpt.buffer, buffer_start..buffer_end)
4086 {
4087 Some(&mut current_excerpt_metadata.insert((excerpt.id, iterator)).1)
4088 } else {
4089 None
4090 }
4091 };
4092
4093 // Visit each metadata item.
4094 if let Some((metadata_buffer_range, metadata)) =
4095 metadata_iter.and_then(Iterator::next)
4096 {
4097 // Find the multibuffer regions that contain the start and end of
4098 // the metadata item's range.
4099 if metadata_buffer_range.start > D::default() {
4100 while let Some(region) = cursor.region() {
4101 if region.is_main_buffer
4102 && (region.buffer_range.end >= metadata_buffer_range.start
4103 || cursor.is_at_end_of_excerpt())
4104 {
4105 break;
4106 }
4107 cursor.next();
4108 }
4109 }
4110 let start_region = cursor.region()?;
4111 while let Some(region) = cursor.region() {
4112 if region.is_main_buffer
4113 && (region.buffer_range.end > metadata_buffer_range.end
4114 || cursor.is_at_end_of_excerpt())
4115 {
4116 break;
4117 }
4118 cursor.next();
4119 }
4120 let end_region = cursor.region();
4121
4122 // Convert the metadata item's range into multibuffer coordinates.
4123 let mut start_position = start_region.range.start;
4124 let region_buffer_start = start_region.buffer_range.start;
4125 if start_region.is_main_buffer
4126 && metadata_buffer_range.start > region_buffer_start
4127 {
4128 start_position
4129 .add_assign(&(metadata_buffer_range.start - region_buffer_start));
4130 start_position = start_position.min(start_region.range.end);
4131 }
4132
4133 let mut end_position = max_position;
4134 if let Some(end_region) = &end_region {
4135 end_position = end_region.range.start;
4136 debug_assert!(end_region.is_main_buffer);
4137 let region_buffer_start = end_region.buffer_range.start;
4138 if metadata_buffer_range.end > region_buffer_start {
4139 end_position
4140 .add_assign(&(metadata_buffer_range.end - region_buffer_start));
4141 }
4142 end_position = end_position.min(end_region.range.end);
4143 }
4144
4145 if start_position <= query_range.end && end_position >= query_range.start {
4146 return Some((start_position..end_position, metadata, excerpt));
4147 }
4148 }
4149 // When there are no more metadata items for this excerpt, move to the next excerpt.
4150 else {
4151 current_excerpt_metadata.take();
4152 if let Some((end_excerpt_id, _)) = range_end {
4153 if excerpt.id == end_excerpt_id {
4154 return None;
4155 }
4156 }
4157 cursor.next_excerpt();
4158 }
4159 }
4160 })
4161 }
4162
4163 pub fn diff_hunk_before<T: ToOffset>(&self, position: T) -> Option<MultiBufferRow> {
4164 let offset = position.to_offset(self);
4165
4166 let mut cursor = self.cursor::<DimensionPair<usize, Point>>();
4167 cursor.seek(&DimensionPair {
4168 key: offset,
4169 value: None,
4170 });
4171 cursor.seek_to_start_of_current_excerpt();
4172 let excerpt = cursor.excerpt()?;
4173
4174 let excerpt_end = excerpt.range.context.end.to_offset(&excerpt.buffer);
4175 let current_position = self
4176 .anchor_before(offset)
4177 .text_anchor
4178 .to_offset(&excerpt.buffer);
4179 let excerpt_end = excerpt
4180 .buffer
4181 .anchor_before(excerpt_end.min(current_position));
4182
4183 if let Some(diff) = self.diffs.get(&excerpt.buffer_id) {
4184 for hunk in diff.hunks_intersecting_range_rev(
4185 excerpt.range.context.start..excerpt_end,
4186 &excerpt.buffer,
4187 ) {
4188 let hunk_end = hunk.buffer_range.end.to_offset(&excerpt.buffer);
4189 if hunk_end >= current_position {
4190 continue;
4191 }
4192 let start =
4193 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, hunk.buffer_range.start)
4194 .to_point(&self);
4195 return Some(MultiBufferRow(start.row));
4196 }
4197 }
4198
4199 loop {
4200 cursor.prev_excerpt();
4201 let excerpt = cursor.excerpt()?;
4202
4203 let Some(diff) = self.diffs.get(&excerpt.buffer_id) else {
4204 continue;
4205 };
4206 let mut hunks =
4207 diff.hunks_intersecting_range_rev(excerpt.range.context.clone(), &excerpt.buffer);
4208 let Some(hunk) = hunks.next() else {
4209 continue;
4210 };
4211 let start = Anchor::in_buffer(excerpt.id, excerpt.buffer_id, hunk.buffer_range.start)
4212 .to_point(&self);
4213 return Some(MultiBufferRow(start.row));
4214 }
4215 }
4216
4217 pub fn has_diff_hunks(&self) -> bool {
4218 self.diffs.values().any(|diff| !diff.is_empty())
4219 }
4220
4221 pub fn is_inside_word<T: ToOffset>(&self, position: T, for_completion: bool) -> bool {
4222 let position = position.to_offset(self);
4223 let classifier = self
4224 .char_classifier_at(position)
4225 .for_completion(for_completion);
4226 let next_char_kind = self.chars_at(position).next().map(|c| classifier.kind(c));
4227 let prev_char_kind = self
4228 .reversed_chars_at(position)
4229 .next()
4230 .map(|c| classifier.kind(c));
4231 prev_char_kind.zip(next_char_kind) == Some((CharKind::Word, CharKind::Word))
4232 }
4233
4234 pub fn surrounding_word<T: ToOffset>(
4235 &self,
4236 start: T,
4237 for_completion: bool,
4238 ) -> (Range<usize>, Option<CharKind>) {
4239 let mut start = start.to_offset(self);
4240 let mut end = start;
4241 let mut next_chars = self.chars_at(start).peekable();
4242 let mut prev_chars = self.reversed_chars_at(start).peekable();
4243
4244 let classifier = self
4245 .char_classifier_at(start)
4246 .for_completion(for_completion);
4247
4248 let word_kind = cmp::max(
4249 prev_chars.peek().copied().map(|c| classifier.kind(c)),
4250 next_chars.peek().copied().map(|c| classifier.kind(c)),
4251 );
4252
4253 for ch in prev_chars {
4254 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4255 start -= ch.len_utf8();
4256 } else {
4257 break;
4258 }
4259 }
4260
4261 for ch in next_chars {
4262 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4263 end += ch.len_utf8();
4264 } else {
4265 break;
4266 }
4267 }
4268
4269 (start..end, word_kind)
4270 }
4271
4272 pub fn char_kind_before<T: ToOffset>(
4273 &self,
4274 start: T,
4275 for_completion: bool,
4276 ) -> Option<CharKind> {
4277 let start = start.to_offset(self);
4278 let classifier = self
4279 .char_classifier_at(start)
4280 .for_completion(for_completion);
4281 self.reversed_chars_at(start)
4282 .next()
4283 .map(|ch| classifier.kind(ch))
4284 }
4285
4286 pub fn is_singleton(&self) -> bool {
4287 self.singleton
4288 }
4289
4290 pub fn as_singleton(&self) -> Option<(&ExcerptId, BufferId, &BufferSnapshot)> {
4291 if self.singleton {
4292 self.excerpts
4293 .iter()
4294 .next()
4295 .map(|e| (&e.id, e.buffer_id, &e.buffer))
4296 } else {
4297 None
4298 }
4299 }
4300
4301 pub fn len(&self) -> usize {
4302 self.diff_transforms.summary().output.len
4303 }
4304
4305 pub fn is_empty(&self) -> bool {
4306 self.excerpts.summary().text.len == 0
4307 }
4308
4309 pub fn widest_line_number(&self) -> u32 {
4310 // widest_line_number is 0-based, so 1 is added to get the displayed line number.
4311 self.excerpts.summary().widest_line_number + 1
4312 }
4313
4314 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes<'_> {
4315 let range = range.start.to_offset(self)..range.end.to_offset(self);
4316 let mut excerpts = self.cursor::<usize>();
4317 excerpts.seek(&range.start);
4318
4319 let mut chunk;
4320 let mut has_trailing_newline;
4321 let excerpt_bytes;
4322 if let Some(region) = excerpts.region() {
4323 let mut bytes = region.buffer.bytes_in_range(
4324 region.buffer_range.start + range.start - region.range.start
4325 ..(region.buffer_range.start + range.end - region.range.start)
4326 .min(region.buffer_range.end),
4327 );
4328 chunk = bytes.next().unwrap_or(&[][..]);
4329 excerpt_bytes = Some(bytes);
4330 has_trailing_newline = region.has_trailing_newline && range.end >= region.range.end;
4331 if chunk.is_empty() && has_trailing_newline {
4332 chunk = b"\n";
4333 has_trailing_newline = false;
4334 }
4335 } else {
4336 chunk = &[][..];
4337 excerpt_bytes = None;
4338 has_trailing_newline = false;
4339 };
4340
4341 MultiBufferBytes {
4342 range,
4343 cursor: excerpts,
4344 excerpt_bytes,
4345 has_trailing_newline,
4346 chunk,
4347 }
4348 }
4349
4350 pub fn reversed_bytes_in_range<T: ToOffset>(
4351 &self,
4352 range: Range<T>,
4353 ) -> ReversedMultiBufferBytes<'_> {
4354 let range = range.start.to_offset(self)..range.end.to_offset(self);
4355 let mut chunks = self.reversed_chunks_in_range(range.clone());
4356 let chunk = chunks.next().map_or(&[][..], |c| c.as_bytes());
4357 ReversedMultiBufferBytes {
4358 range,
4359 chunks,
4360 chunk,
4361 }
4362 }
4363
4364 pub fn row_infos(&self, start_row: MultiBufferRow) -> MultiBufferRows<'_> {
4365 let mut cursor = self.cursor::<Point>();
4366 cursor.seek(&Point::new(start_row.0, 0));
4367 let mut result = MultiBufferRows {
4368 point: Point::new(0, 0),
4369 is_empty: self.excerpts.is_empty(),
4370 is_singleton: self.is_singleton(),
4371 cursor,
4372 };
4373 result.seek(start_row);
4374 result
4375 }
4376
4377 pub fn chunks<T: ToOffset>(
4378 &self,
4379 range: Range<T>,
4380 language_aware: bool,
4381 ) -> MultiBufferChunks<'_> {
4382 let mut chunks = MultiBufferChunks {
4383 excerpt_offset_range: ExcerptOffset::new(0)..ExcerptOffset::new(0),
4384 range: 0..0,
4385 excerpts: self.excerpts.cursor(&()),
4386 diff_transforms: self.diff_transforms.cursor(&()),
4387 diffs: &self.diffs,
4388 diff_base_chunks: None,
4389 excerpt_chunks: None,
4390 buffer_chunk: None,
4391 language_aware,
4392 };
4393 let range = range.start.to_offset(self)..range.end.to_offset(self);
4394 chunks.seek(range);
4395 chunks
4396 }
4397
4398 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
4399 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset)
4400 }
4401
4402 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
4403 self.clip_dimension(point, bias, text::BufferSnapshot::clip_point)
4404 }
4405
4406 pub fn clip_offset_utf16(&self, offset: OffsetUtf16, bias: Bias) -> OffsetUtf16 {
4407 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset_utf16)
4408 }
4409
4410 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
4411 self.clip_dimension(point.0, bias, |buffer, point, bias| {
4412 buffer.clip_point_utf16(Unclipped(point), bias)
4413 })
4414 }
4415
4416 pub fn offset_to_point(&self, offset: usize) -> Point {
4417 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point)
4418 }
4419
4420 pub fn offset_to_point_utf16(&self, offset: usize) -> PointUtf16 {
4421 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point_utf16)
4422 }
4423
4424 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
4425 self.convert_dimension(point, text::BufferSnapshot::point_to_point_utf16)
4426 }
4427
4428 pub fn point_to_offset(&self, point: Point) -> usize {
4429 self.convert_dimension(point, text::BufferSnapshot::point_to_offset)
4430 }
4431
4432 pub fn offset_utf16_to_offset(&self, offset: OffsetUtf16) -> usize {
4433 self.convert_dimension(offset, text::BufferSnapshot::offset_utf16_to_offset)
4434 }
4435
4436 pub fn offset_to_offset_utf16(&self, offset: usize) -> OffsetUtf16 {
4437 self.convert_dimension(offset, text::BufferSnapshot::offset_to_offset_utf16)
4438 }
4439
4440 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
4441 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_offset)
4442 }
4443
4444 fn clip_dimension<D>(
4445 &self,
4446 position: D,
4447 bias: Bias,
4448 clip_buffer_position: fn(&text::BufferSnapshot, D, Bias) -> D,
4449 ) -> D
4450 where
4451 D: TextDimension + Ord + Sub<D, Output = D>,
4452 {
4453 let mut cursor = self.cursor();
4454 cursor.seek(&position);
4455 if let Some(region) = cursor.region() {
4456 if position >= region.range.end {
4457 return region.range.end;
4458 }
4459 let overshoot = position - region.range.start;
4460 let mut buffer_position = region.buffer_range.start;
4461 buffer_position.add_assign(&overshoot);
4462 let clipped_buffer_position =
4463 clip_buffer_position(®ion.buffer, buffer_position, bias);
4464 let mut position = region.range.start;
4465 position.add_assign(&(clipped_buffer_position - region.buffer_range.start));
4466 position
4467 } else {
4468 D::from_text_summary(&self.text_summary())
4469 }
4470 }
4471
4472 fn convert_dimension<D1, D2>(
4473 &self,
4474 key: D1,
4475 convert_buffer_dimension: fn(&text::BufferSnapshot, D1) -> D2,
4476 ) -> D2
4477 where
4478 D1: TextDimension + Ord + Sub<D1, Output = D1>,
4479 D2: TextDimension + Ord + Sub<D2, Output = D2>,
4480 {
4481 let mut cursor = self.cursor::<DimensionPair<D1, D2>>();
4482 cursor.seek(&DimensionPair { key, value: None });
4483 if let Some(region) = cursor.region() {
4484 if key >= region.range.end.key {
4485 return region.range.end.value.unwrap();
4486 }
4487 let start_key = region.range.start.key;
4488 let start_value = region.range.start.value.unwrap();
4489 let buffer_start_key = region.buffer_range.start.key;
4490 let buffer_start_value = region.buffer_range.start.value.unwrap();
4491 let mut buffer_key = buffer_start_key;
4492 buffer_key.add_assign(&(key - start_key));
4493 let buffer_value = convert_buffer_dimension(®ion.buffer, buffer_key);
4494 let mut result = start_value;
4495 result.add_assign(&(buffer_value - buffer_start_value));
4496 result
4497 } else {
4498 D2::from_text_summary(&self.text_summary())
4499 }
4500 }
4501
4502 pub fn point_to_buffer_offset<T: ToOffset>(
4503 &self,
4504 point: T,
4505 ) -> Option<(&BufferSnapshot, usize)> {
4506 let offset = point.to_offset(self);
4507 let mut cursor = self.cursor::<usize>();
4508 cursor.seek(&offset);
4509 let region = cursor.region()?;
4510 let overshoot = offset - region.range.start;
4511 let buffer_offset = region.buffer_range.start + overshoot;
4512 if buffer_offset == region.buffer.len() + 1
4513 && region.has_trailing_newline
4514 && !region.is_main_buffer
4515 {
4516 return Some((&cursor.excerpt()?.buffer, cursor.main_buffer_position()?));
4517 } else if buffer_offset > region.buffer.len() {
4518 return None;
4519 }
4520 Some((region.buffer, buffer_offset))
4521 }
4522
4523 pub fn point_to_buffer_point(
4524 &self,
4525 point: Point,
4526 ) -> Option<(&BufferSnapshot, Point, ExcerptId)> {
4527 let mut cursor = self.cursor::<Point>();
4528 cursor.seek(&point);
4529 let region = cursor.region()?;
4530 let overshoot = point - region.range.start;
4531 let buffer_point = region.buffer_range.start + overshoot;
4532 let excerpt = cursor.excerpt()?;
4533 if buffer_point == region.buffer.max_point() + Point::new(1, 0)
4534 && region.has_trailing_newline
4535 && !region.is_main_buffer
4536 {
4537 return Some((&excerpt.buffer, cursor.main_buffer_position()?, excerpt.id));
4538 } else if buffer_point > region.buffer.max_point() {
4539 return None;
4540 }
4541 Some((region.buffer, buffer_point, excerpt.id))
4542 }
4543
4544 pub fn suggested_indents(
4545 &self,
4546 rows: impl IntoIterator<Item = u32>,
4547 cx: &App,
4548 ) -> BTreeMap<MultiBufferRow, IndentSize> {
4549 let mut result = BTreeMap::new();
4550
4551 let mut rows_for_excerpt = Vec::new();
4552 let mut cursor = self.cursor::<Point>();
4553 let mut rows = rows.into_iter().peekable();
4554 let mut prev_row = u32::MAX;
4555 let mut prev_language_indent_size = IndentSize::default();
4556
4557 while let Some(row) = rows.next() {
4558 cursor.seek(&Point::new(row, 0));
4559 let Some(region) = cursor.region() else {
4560 continue;
4561 };
4562
4563 // Retrieve the language and indent size once for each disjoint region being indented.
4564 let single_indent_size = if row.saturating_sub(1) == prev_row {
4565 prev_language_indent_size
4566 } else {
4567 region
4568 .buffer
4569 .language_indent_size_at(Point::new(row, 0), cx)
4570 };
4571 prev_language_indent_size = single_indent_size;
4572 prev_row = row;
4573
4574 let start_buffer_row = region.buffer_range.start.row;
4575 let start_multibuffer_row = region.range.start.row;
4576 let end_multibuffer_row = region.range.end.row;
4577
4578 rows_for_excerpt.push(row);
4579 while let Some(next_row) = rows.peek().copied() {
4580 if end_multibuffer_row > next_row {
4581 rows_for_excerpt.push(next_row);
4582 rows.next();
4583 } else {
4584 break;
4585 }
4586 }
4587
4588 let buffer_rows = rows_for_excerpt
4589 .drain(..)
4590 .map(|row| start_buffer_row + row - start_multibuffer_row);
4591 let buffer_indents = region
4592 .buffer
4593 .suggested_indents(buffer_rows, single_indent_size);
4594 let multibuffer_indents = buffer_indents.into_iter().map(|(row, indent)| {
4595 (
4596 MultiBufferRow(start_multibuffer_row + row - start_buffer_row),
4597 indent,
4598 )
4599 });
4600 result.extend(multibuffer_indents);
4601 }
4602
4603 result
4604 }
4605
4606 pub fn indent_size_for_line(&self, row: MultiBufferRow) -> IndentSize {
4607 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4608 let mut size = buffer.indent_size_for_line(range.start.row);
4609 size.len = size
4610 .len
4611 .min(range.end.column)
4612 .saturating_sub(range.start.column);
4613 size
4614 } else {
4615 IndentSize::spaces(0)
4616 }
4617 }
4618
4619 pub fn line_indent_for_row(&self, row: MultiBufferRow) -> LineIndent {
4620 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4621 LineIndent::from_iter(buffer.text_for_range(range).flat_map(|s| s.chars()))
4622 } else {
4623 LineIndent::spaces(0)
4624 }
4625 }
4626
4627 pub fn indent_and_comment_for_line(&self, row: MultiBufferRow, cx: &App) -> String {
4628 let mut indent = self.indent_size_for_line(row).chars().collect::<String>();
4629
4630 if self.language_settings(cx).extend_comment_on_newline {
4631 if let Some(language_scope) = self.language_scope_at(Point::new(row.0, 0)) {
4632 let delimiters = language_scope.line_comment_prefixes();
4633 for delimiter in delimiters {
4634 if *self
4635 .chars_at(Point::new(row.0, indent.len() as u32))
4636 .take(delimiter.chars().count())
4637 .collect::<String>()
4638 .as_str()
4639 == **delimiter
4640 {
4641 indent.push_str(&delimiter);
4642 break;
4643 }
4644 }
4645 }
4646 }
4647
4648 indent
4649 }
4650
4651 pub fn is_line_whitespace_upto<T>(&self, position: T) -> bool
4652 where
4653 T: ToOffset,
4654 {
4655 for char in self.reversed_chars_at(position) {
4656 if !char.is_whitespace() {
4657 return false;
4658 }
4659 if char == '\n' {
4660 return true;
4661 }
4662 }
4663 return true;
4664 }
4665
4666 pub fn prev_non_blank_row(&self, mut row: MultiBufferRow) -> Option<MultiBufferRow> {
4667 while row.0 > 0 {
4668 row.0 -= 1;
4669 if !self.is_line_blank(row) {
4670 return Some(row);
4671 }
4672 }
4673 None
4674 }
4675
4676 pub fn line_len(&self, row: MultiBufferRow) -> u32 {
4677 if let Some((_, range)) = self.buffer_line_for_row(row) {
4678 range.end.column - range.start.column
4679 } else {
4680 0
4681 }
4682 }
4683
4684 pub fn buffer_line_for_row(
4685 &self,
4686 row: MultiBufferRow,
4687 ) -> Option<(&BufferSnapshot, Range<Point>)> {
4688 let mut cursor = self.cursor::<Point>();
4689 let point = Point::new(row.0, 0);
4690 cursor.seek(&point);
4691 let region = cursor.region()?;
4692 let overshoot = point.min(region.range.end) - region.range.start;
4693 let buffer_point = region.buffer_range.start + overshoot;
4694 if buffer_point.row > region.buffer_range.end.row {
4695 return None;
4696 }
4697 let line_start = Point::new(buffer_point.row, 0).max(region.buffer_range.start);
4698 let line_end = Point::new(buffer_point.row, region.buffer.line_len(buffer_point.row))
4699 .min(region.buffer_range.end);
4700 Some((region.buffer, line_start..line_end))
4701 }
4702
4703 pub fn max_point(&self) -> Point {
4704 self.text_summary().lines
4705 }
4706
4707 pub fn max_row(&self) -> MultiBufferRow {
4708 MultiBufferRow(self.text_summary().lines.row)
4709 }
4710
4711 pub fn text_summary(&self) -> TextSummary {
4712 self.diff_transforms.summary().output
4713 }
4714
4715 pub fn text_summary_for_range<D, O>(&self, range: Range<O>) -> D
4716 where
4717 D: TextDimension,
4718 O: ToOffset,
4719 {
4720 let range = range.start.to_offset(self)..range.end.to_offset(self);
4721 let mut cursor = self.diff_transforms.cursor::<(usize, ExcerptOffset)>(&());
4722 cursor.seek(&range.start, Bias::Right, &());
4723
4724 let Some(first_transform) = cursor.item() else {
4725 return D::from_text_summary(&TextSummary::default());
4726 };
4727
4728 let diff_transform_start = cursor.start().0;
4729 let diff_transform_end = cursor.end(&()).0;
4730 let diff_start = range.start;
4731 let start_overshoot = diff_start - diff_transform_start;
4732 let end_overshoot = std::cmp::min(range.end, diff_transform_end) - diff_transform_start;
4733
4734 let mut result = match first_transform {
4735 DiffTransform::BufferContent { .. } => {
4736 let excerpt_start = cursor.start().1 + ExcerptOffset::new(start_overshoot);
4737 let excerpt_end = cursor.start().1 + ExcerptOffset::new(end_overshoot);
4738 self.text_summary_for_excerpt_offset_range(excerpt_start..excerpt_end)
4739 }
4740 DiffTransform::DeletedHunk {
4741 buffer_id,
4742 base_text_byte_range,
4743 has_trailing_newline,
4744 ..
4745 } => {
4746 let buffer_start = base_text_byte_range.start + start_overshoot;
4747 let mut buffer_end = base_text_byte_range.start + end_overshoot;
4748 let Some(base_text) = self.diffs.get(buffer_id).map(|diff| diff.base_text()) else {
4749 panic!("{:?} is in non-existent deleted hunk", range.start)
4750 };
4751
4752 let include_trailing_newline =
4753 *has_trailing_newline && range.end >= diff_transform_end;
4754 if include_trailing_newline {
4755 buffer_end -= 1;
4756 }
4757
4758 let mut summary =
4759 base_text.text_summary_for_range::<D, _>(buffer_start..buffer_end);
4760
4761 if include_trailing_newline {
4762 summary.add_assign(&D::from_text_summary(&TextSummary::newline()))
4763 }
4764
4765 summary
4766 }
4767 };
4768 if range.end < diff_transform_end {
4769 return result;
4770 }
4771
4772 cursor.next(&());
4773 result.add_assign(&D::from_text_summary(&cursor.summary(
4774 &range.end,
4775 Bias::Right,
4776 &(),
4777 )));
4778
4779 let Some(last_transform) = cursor.item() else {
4780 return result;
4781 };
4782
4783 let overshoot = range.end - cursor.start().0;
4784 let suffix = match last_transform {
4785 DiffTransform::BufferContent { .. } => {
4786 let end = cursor.start().1 + ExcerptOffset::new(overshoot);
4787 self.text_summary_for_excerpt_offset_range::<D>(cursor.start().1..end)
4788 }
4789 DiffTransform::DeletedHunk {
4790 base_text_byte_range,
4791 buffer_id,
4792 has_trailing_newline,
4793 ..
4794 } => {
4795 let buffer_end = base_text_byte_range.start + overshoot;
4796 let Some(base_text) = self.diffs.get(buffer_id).map(|diff| diff.base_text()) else {
4797 panic!("{:?} is in non-existent deleted hunk", range.end)
4798 };
4799
4800 let mut suffix = base_text
4801 .text_summary_for_range::<D, _>(base_text_byte_range.start..buffer_end);
4802 if *has_trailing_newline && buffer_end == base_text_byte_range.end + 1 {
4803 suffix.add_assign(&D::from_text_summary(&TextSummary::newline()))
4804 }
4805 suffix
4806 }
4807 };
4808
4809 result.add_assign(&suffix);
4810 result
4811 }
4812
4813 fn text_summary_for_excerpt_offset_range<D>(&self, mut range: Range<ExcerptOffset>) -> D
4814 where
4815 D: TextDimension,
4816 {
4817 // let mut range = range.start..range.end;
4818 let mut summary = D::zero(&());
4819 let mut cursor = self.excerpts.cursor::<ExcerptOffset>(&());
4820 cursor.seek(&range.start, Bias::Right, &());
4821 if let Some(excerpt) = cursor.item() {
4822 let mut end_before_newline = cursor.end(&());
4823 if excerpt.has_trailing_newline {
4824 end_before_newline -= ExcerptOffset::new(1);
4825 }
4826
4827 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
4828 let start_in_excerpt = excerpt_start + (range.start - *cursor.start()).value;
4829 let end_in_excerpt =
4830 excerpt_start + (cmp::min(end_before_newline, range.end) - *cursor.start()).value;
4831 summary.add_assign(
4832 &excerpt
4833 .buffer
4834 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
4835 );
4836
4837 if range.end > end_before_newline {
4838 summary.add_assign(&D::from_text_summary(&TextSummary::from("\n")));
4839 }
4840
4841 cursor.next(&());
4842 }
4843
4844 if range.end > *cursor.start() {
4845 summary.add_assign(
4846 &cursor
4847 .summary::<_, ExcerptDimension<D>>(&range.end, Bias::Right, &())
4848 .0,
4849 );
4850 if let Some(excerpt) = cursor.item() {
4851 range.end = cmp::max(*cursor.start(), range.end);
4852
4853 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
4854 let end_in_excerpt = excerpt_start + (range.end - *cursor.start()).value;
4855 summary.add_assign(
4856 &excerpt
4857 .buffer
4858 .text_summary_for_range(excerpt_start..end_in_excerpt),
4859 );
4860 }
4861 }
4862
4863 summary
4864 }
4865
4866 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
4867 where
4868 D: TextDimension + Ord + Sub<D, Output = D>,
4869 {
4870 self.summaries_for_anchors([anchor])[0]
4871 }
4872
4873 fn resolve_summary_for_anchor<D>(
4874 &self,
4875 anchor: &Anchor,
4876 excerpt_position: D,
4877 diff_transforms: &mut Cursor<DiffTransform, (ExcerptDimension<D>, OutputDimension<D>)>,
4878 ) -> D
4879 where
4880 D: TextDimension + Ord + Sub<D, Output = D>,
4881 {
4882 loop {
4883 let transform_end_position = diff_transforms.end(&()).0.0;
4884 let at_transform_end =
4885 excerpt_position == transform_end_position && diff_transforms.item().is_some();
4886 if at_transform_end && anchor.text_anchor.bias == Bias::Right {
4887 diff_transforms.next(&());
4888 continue;
4889 }
4890
4891 let mut position = diff_transforms.start().1.0;
4892 match diff_transforms.item() {
4893 Some(DiffTransform::DeletedHunk {
4894 buffer_id,
4895 base_text_byte_range,
4896 ..
4897 }) => {
4898 if let Some(diff_base_anchor) = &anchor.diff_base_anchor {
4899 if let Some(base_text) =
4900 self.diffs.get(buffer_id).map(|diff| diff.base_text())
4901 {
4902 if base_text.can_resolve(&diff_base_anchor) {
4903 let base_text_offset = diff_base_anchor.to_offset(&base_text);
4904 if base_text_offset >= base_text_byte_range.start
4905 && base_text_offset <= base_text_byte_range.end
4906 {
4907 let position_in_hunk = base_text
4908 .text_summary_for_range::<D, _>(
4909 base_text_byte_range.start..base_text_offset,
4910 );
4911 position.add_assign(&position_in_hunk);
4912 } else if at_transform_end {
4913 diff_transforms.next(&());
4914 continue;
4915 }
4916 }
4917 }
4918 }
4919 }
4920 _ => {
4921 if at_transform_end && anchor.diff_base_anchor.is_some() {
4922 diff_transforms.next(&());
4923 continue;
4924 }
4925 let overshoot = excerpt_position - diff_transforms.start().0.0;
4926 position.add_assign(&overshoot);
4927 }
4928 }
4929
4930 return position;
4931 }
4932 }
4933
4934 fn excerpt_offset_for_anchor(&self, anchor: &Anchor) -> ExcerptOffset {
4935 let mut cursor = self
4936 .excerpts
4937 .cursor::<(Option<&Locator>, ExcerptOffset)>(&());
4938 let locator = self.excerpt_locator_for_id(anchor.excerpt_id);
4939
4940 cursor.seek(&Some(locator), Bias::Left, &());
4941 if cursor.item().is_none() {
4942 cursor.next(&());
4943 }
4944
4945 let mut position = cursor.start().1;
4946 if let Some(excerpt) = cursor.item() {
4947 if excerpt.id == anchor.excerpt_id {
4948 let excerpt_buffer_start = excerpt
4949 .buffer
4950 .offset_for_anchor(&excerpt.range.context.start);
4951 let excerpt_buffer_end =
4952 excerpt.buffer.offset_for_anchor(&excerpt.range.context.end);
4953 let buffer_position = cmp::min(
4954 excerpt_buffer_end,
4955 excerpt.buffer.offset_for_anchor(&anchor.text_anchor),
4956 );
4957 if buffer_position > excerpt_buffer_start {
4958 position.value += buffer_position - excerpt_buffer_start;
4959 }
4960 }
4961 }
4962 position
4963 }
4964
4965 pub fn latest_excerpt_id(&self, mut excerpt_id: ExcerptId) -> ExcerptId {
4966 while let Some(replacement) = self.replaced_excerpts.get(&excerpt_id) {
4967 excerpt_id = *replacement;
4968 }
4969 return excerpt_id;
4970 }
4971
4972 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
4973 where
4974 D: TextDimension + Ord + Sub<D, Output = D>,
4975 I: 'a + IntoIterator<Item = &'a Anchor>,
4976 {
4977 let mut anchors = anchors.into_iter().peekable();
4978 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(&());
4979 let mut diff_transforms_cursor = self
4980 .diff_transforms
4981 .cursor::<(ExcerptDimension<D>, OutputDimension<D>)>(&());
4982 diff_transforms_cursor.next(&());
4983
4984 let mut summaries = Vec::new();
4985 while let Some(anchor) = anchors.peek() {
4986 let excerpt_id = self.latest_excerpt_id(anchor.excerpt_id);
4987 let excerpt_anchors = iter::from_fn(|| {
4988 let anchor = anchors.peek()?;
4989 if self.latest_excerpt_id(anchor.excerpt_id) == excerpt_id {
4990 Some(anchors.next().unwrap())
4991 } else {
4992 None
4993 }
4994 });
4995
4996 let locator = self.excerpt_locator_for_id(excerpt_id);
4997 cursor.seek_forward(locator, Bias::Left, &());
4998 if cursor.item().is_none() {
4999 cursor.next(&());
5000 }
5001
5002 let excerpt_start_position = D::from_text_summary(&cursor.start().text);
5003 if let Some(excerpt) = cursor.item() {
5004 if excerpt.id != excerpt_id {
5005 let position = self.resolve_summary_for_anchor(
5006 &Anchor::min(),
5007 excerpt_start_position,
5008 &mut diff_transforms_cursor,
5009 );
5010 summaries.extend(excerpt_anchors.map(|_| position));
5011 continue;
5012 }
5013 let excerpt_buffer_start =
5014 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
5015 let excerpt_buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
5016 for (buffer_summary, anchor) in excerpt
5017 .buffer
5018 .summaries_for_anchors_with_payload::<D, _, _>(
5019 excerpt_anchors.map(|a| (&a.text_anchor, a)),
5020 )
5021 {
5022 let summary = cmp::min(excerpt_buffer_end, buffer_summary);
5023 let mut position = excerpt_start_position;
5024 if summary > excerpt_buffer_start {
5025 position.add_assign(&(summary - excerpt_buffer_start));
5026 }
5027
5028 if position > diff_transforms_cursor.start().0.0 {
5029 diff_transforms_cursor.seek_forward(
5030 &ExcerptDimension(position),
5031 Bias::Left,
5032 &(),
5033 );
5034 }
5035
5036 summaries.push(self.resolve_summary_for_anchor(
5037 anchor,
5038 position,
5039 &mut diff_transforms_cursor,
5040 ));
5041 }
5042 } else {
5043 diff_transforms_cursor.seek_forward(
5044 &ExcerptDimension(excerpt_start_position),
5045 Bias::Left,
5046 &(),
5047 );
5048 let position = self.resolve_summary_for_anchor(
5049 &Anchor::max(),
5050 excerpt_start_position,
5051 &mut diff_transforms_cursor,
5052 );
5053 summaries.extend(excerpt_anchors.map(|_| position));
5054 }
5055 }
5056
5057 summaries
5058 }
5059
5060 pub fn dimensions_from_points<'a, D>(
5061 &'a self,
5062 points: impl 'a + IntoIterator<Item = Point>,
5063 ) -> impl 'a + Iterator<Item = D>
5064 where
5065 D: TextDimension + Sub<D, Output = D>,
5066 {
5067 let mut cursor = self.cursor::<DimensionPair<Point, D>>();
5068 cursor.seek(&DimensionPair {
5069 key: Point::default(),
5070 value: None,
5071 });
5072 let mut points = points.into_iter();
5073 iter::from_fn(move || {
5074 let point = points.next()?;
5075
5076 cursor.seek_forward(&DimensionPair {
5077 key: point,
5078 value: None,
5079 });
5080
5081 if let Some(region) = cursor.region() {
5082 let overshoot = point - region.range.start.key;
5083 let buffer_point = region.buffer_range.start.key + overshoot;
5084 let mut position = region.range.start.value.unwrap();
5085 position.add_assign(
5086 ®ion
5087 .buffer
5088 .text_summary_for_range(region.buffer_range.start.key..buffer_point),
5089 );
5090 if point == region.range.end.key && region.has_trailing_newline {
5091 position.add_assign(&D::from_text_summary(&TextSummary::newline()));
5092 }
5093 return Some(position);
5094 } else {
5095 return Some(D::from_text_summary(&self.text_summary()));
5096 }
5097 })
5098 }
5099
5100 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
5101 where
5102 I: 'a + IntoIterator<Item = &'a Anchor>,
5103 {
5104 let mut anchors = anchors.into_iter().enumerate().peekable();
5105 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
5106 cursor.next(&());
5107
5108 let mut result = Vec::new();
5109
5110 while let Some((_, anchor)) = anchors.peek() {
5111 let old_excerpt_id = anchor.excerpt_id;
5112
5113 // Find the location where this anchor's excerpt should be.
5114 let old_locator = self.excerpt_locator_for_id(old_excerpt_id);
5115 cursor.seek_forward(&Some(old_locator), Bias::Left, &());
5116
5117 if cursor.item().is_none() {
5118 cursor.next(&());
5119 }
5120
5121 let next_excerpt = cursor.item();
5122 let prev_excerpt = cursor.prev_item();
5123
5124 // Process all of the anchors for this excerpt.
5125 while let Some((_, anchor)) = anchors.peek() {
5126 if anchor.excerpt_id != old_excerpt_id {
5127 break;
5128 }
5129 let (anchor_ix, anchor) = anchors.next().unwrap();
5130 let mut anchor = *anchor;
5131
5132 // Leave min and max anchors unchanged if invalid or
5133 // if the old excerpt still exists at this location
5134 let mut kept_position = next_excerpt
5135 .map_or(false, |e| e.id == old_excerpt_id && e.contains(&anchor))
5136 || old_excerpt_id == ExcerptId::max()
5137 || old_excerpt_id == ExcerptId::min();
5138
5139 // If the old excerpt no longer exists at this location, then attempt to
5140 // find an equivalent position for this anchor in an adjacent excerpt.
5141 if !kept_position {
5142 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
5143 if excerpt.contains(&anchor) {
5144 anchor.excerpt_id = excerpt.id;
5145 kept_position = true;
5146 break;
5147 }
5148 }
5149 }
5150
5151 // If there's no adjacent excerpt that contains the anchor's position,
5152 // then report that the anchor has lost its position.
5153 if !kept_position {
5154 anchor = if let Some(excerpt) = next_excerpt {
5155 let mut text_anchor = excerpt
5156 .range
5157 .context
5158 .start
5159 .bias(anchor.text_anchor.bias, &excerpt.buffer);
5160 if text_anchor
5161 .cmp(&excerpt.range.context.end, &excerpt.buffer)
5162 .is_gt()
5163 {
5164 text_anchor = excerpt.range.context.end;
5165 }
5166 Anchor {
5167 buffer_id: Some(excerpt.buffer_id),
5168 excerpt_id: excerpt.id,
5169 text_anchor,
5170 diff_base_anchor: None,
5171 }
5172 } else if let Some(excerpt) = prev_excerpt {
5173 let mut text_anchor = excerpt
5174 .range
5175 .context
5176 .end
5177 .bias(anchor.text_anchor.bias, &excerpt.buffer);
5178 if text_anchor
5179 .cmp(&excerpt.range.context.start, &excerpt.buffer)
5180 .is_lt()
5181 {
5182 text_anchor = excerpt.range.context.start;
5183 }
5184 Anchor {
5185 buffer_id: Some(excerpt.buffer_id),
5186 excerpt_id: excerpt.id,
5187 text_anchor,
5188 diff_base_anchor: None,
5189 }
5190 } else if anchor.text_anchor.bias == Bias::Left {
5191 Anchor::min()
5192 } else {
5193 Anchor::max()
5194 };
5195 }
5196
5197 result.push((anchor_ix, anchor, kept_position));
5198 }
5199 }
5200 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self));
5201 result
5202 }
5203
5204 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
5205 self.anchor_at(position, Bias::Left)
5206 }
5207
5208 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
5209 self.anchor_at(position, Bias::Right)
5210 }
5211
5212 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
5213 let offset = position.to_offset(self);
5214
5215 // Find the given position in the diff transforms. Determine the corresponding
5216 // offset in the excerpts, and whether the position is within a deleted hunk.
5217 let mut diff_transforms = self.diff_transforms.cursor::<(usize, ExcerptOffset)>(&());
5218 diff_transforms.seek(&offset, Bias::Right, &());
5219
5220 if offset == diff_transforms.start().0 && bias == Bias::Left {
5221 if let Some(prev_item) = diff_transforms.prev_item() {
5222 match prev_item {
5223 DiffTransform::DeletedHunk { .. } => {
5224 diff_transforms.prev(&());
5225 }
5226 _ => {}
5227 }
5228 }
5229 }
5230 let offset_in_transform = offset - diff_transforms.start().0;
5231 let mut excerpt_offset = diff_transforms.start().1;
5232 let mut diff_base_anchor = None;
5233 if let Some(DiffTransform::DeletedHunk {
5234 buffer_id,
5235 base_text_byte_range,
5236 has_trailing_newline,
5237 ..
5238 }) = diff_transforms.item()
5239 {
5240 let diff = self.diffs.get(buffer_id).expect("missing diff");
5241 if offset_in_transform > base_text_byte_range.len() {
5242 debug_assert!(*has_trailing_newline);
5243 bias = Bias::Right;
5244 } else {
5245 diff_base_anchor = Some(
5246 diff.base_text()
5247 .anchor_at(base_text_byte_range.start + offset_in_transform, bias),
5248 );
5249 bias = Bias::Left;
5250 }
5251 } else {
5252 excerpt_offset += ExcerptOffset::new(offset_in_transform);
5253 };
5254
5255 if let Some((excerpt_id, buffer_id, buffer)) = self.as_singleton() {
5256 return Anchor {
5257 buffer_id: Some(buffer_id),
5258 excerpt_id: *excerpt_id,
5259 text_anchor: buffer.anchor_at(excerpt_offset.value, bias),
5260 diff_base_anchor,
5261 };
5262 }
5263
5264 let mut excerpts = self
5265 .excerpts
5266 .cursor::<(ExcerptOffset, Option<ExcerptId>)>(&());
5267 excerpts.seek(&excerpt_offset, Bias::Right, &());
5268 if excerpts.item().is_none() && excerpt_offset == excerpts.start().0 && bias == Bias::Left {
5269 excerpts.prev(&());
5270 }
5271 if let Some(excerpt) = excerpts.item() {
5272 let mut overshoot = excerpt_offset.saturating_sub(excerpts.start().0).value;
5273 if excerpt.has_trailing_newline && excerpt_offset == excerpts.end(&()).0 {
5274 overshoot -= 1;
5275 bias = Bias::Right;
5276 }
5277
5278 let buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
5279 let text_anchor =
5280 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
5281 Anchor {
5282 buffer_id: Some(excerpt.buffer_id),
5283 excerpt_id: excerpt.id,
5284 text_anchor,
5285 diff_base_anchor,
5286 }
5287 } else if excerpt_offset.is_zero() && bias == Bias::Left {
5288 Anchor::min()
5289 } else {
5290 Anchor::max()
5291 }
5292 }
5293
5294 /// Returns an anchor for the given excerpt and text anchor,
5295 /// returns None if the excerpt_id is no longer valid.
5296 pub fn anchor_in_excerpt(
5297 &self,
5298 excerpt_id: ExcerptId,
5299 text_anchor: text::Anchor,
5300 ) -> Option<Anchor> {
5301 let excerpt_id = self.latest_excerpt_id(excerpt_id);
5302 let locator = self.excerpt_locator_for_id(excerpt_id);
5303 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
5304 cursor.seek(locator, Bias::Left, &());
5305 if let Some(excerpt) = cursor.item() {
5306 if excerpt.id == excerpt_id {
5307 let text_anchor = excerpt.clip_anchor(text_anchor);
5308 drop(cursor);
5309 return Some(Anchor {
5310 buffer_id: Some(excerpt.buffer_id),
5311 excerpt_id,
5312 text_anchor,
5313 diff_base_anchor: None,
5314 });
5315 }
5316 }
5317 None
5318 }
5319
5320 pub fn context_range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<text::Anchor>> {
5321 Some(self.excerpt(excerpt_id)?.range.context.clone())
5322 }
5323
5324 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
5325 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
5326 true
5327 } else if let Some(excerpt) = self.excerpt(anchor.excerpt_id) {
5328 excerpt.buffer.can_resolve(&anchor.text_anchor)
5329 } else {
5330 false
5331 }
5332 }
5333
5334 pub fn excerpts(
5335 &self,
5336 ) -> impl Iterator<Item = (ExcerptId, &BufferSnapshot, ExcerptRange<text::Anchor>)> {
5337 self.excerpts
5338 .iter()
5339 .map(|excerpt| (excerpt.id, &excerpt.buffer, excerpt.range.clone()))
5340 }
5341
5342 fn cursor<D: TextDimension + Default>(&self) -> MultiBufferCursor<'_, D> {
5343 let excerpts = self.excerpts.cursor(&());
5344 let diff_transforms = self.diff_transforms.cursor(&());
5345 MultiBufferCursor {
5346 excerpts,
5347 diff_transforms,
5348 diffs: &self.diffs,
5349 cached_region: None,
5350 }
5351 }
5352
5353 pub fn excerpt_before(&self, id: ExcerptId) -> Option<MultiBufferExcerpt<'_>> {
5354 let start_locator = self.excerpt_locator_for_id(id);
5355 let mut excerpts = self
5356 .excerpts
5357 .cursor::<(Option<&Locator>, ExcerptDimension<usize>)>(&());
5358 excerpts.seek(&Some(start_locator), Bias::Left, &());
5359 excerpts.prev(&());
5360
5361 let mut diff_transforms = self.diff_transforms.cursor::<DiffTransforms<usize>>(&());
5362 diff_transforms.seek(&excerpts.start().1, Bias::Left, &());
5363 if diff_transforms.end(&()).excerpt_dimension < excerpts.start().1 {
5364 diff_transforms.next(&());
5365 }
5366
5367 let excerpt = excerpts.item()?;
5368 Some(MultiBufferExcerpt {
5369 excerpt,
5370 offset: diff_transforms.start().output_dimension.0,
5371 buffer_offset: excerpt.range.context.start.to_offset(&excerpt.buffer),
5372 excerpt_offset: excerpts.start().1.clone(),
5373 diff_transforms,
5374 })
5375 }
5376
5377 pub fn excerpt_boundaries_in_range<R, T>(
5378 &self,
5379 range: R,
5380 ) -> impl Iterator<Item = ExcerptBoundary> + '_
5381 where
5382 R: RangeBounds<T>,
5383 T: ToOffset,
5384 {
5385 let start_offset;
5386 let start = match range.start_bound() {
5387 Bound::Included(start) => {
5388 start_offset = start.to_offset(self);
5389 Bound::Included(start_offset)
5390 }
5391 Bound::Excluded(_) => {
5392 panic!("not supported")
5393 }
5394 Bound::Unbounded => {
5395 start_offset = 0;
5396 Bound::Unbounded
5397 }
5398 };
5399 let end = match range.end_bound() {
5400 Bound::Included(end) => Bound::Included(end.to_offset(self)),
5401 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
5402 Bound::Unbounded => Bound::Unbounded,
5403 };
5404 let bounds = (start, end);
5405
5406 let mut cursor = self.cursor::<DimensionPair<usize, Point>>();
5407 cursor.seek(&DimensionPair {
5408 key: start_offset,
5409 value: None,
5410 });
5411
5412 if cursor
5413 .region()
5414 .is_some_and(|region| bounds.contains(®ion.range.start.key))
5415 {
5416 cursor.prev_excerpt();
5417 } else {
5418 cursor.seek_to_start_of_current_excerpt();
5419 }
5420 let mut prev_region = cursor.region();
5421
5422 cursor.next_excerpt();
5423
5424 iter::from_fn(move || {
5425 loop {
5426 if self.singleton {
5427 return None;
5428 }
5429
5430 let next_region = cursor.region()?;
5431 cursor.next_excerpt();
5432 if !bounds.contains(&next_region.range.start.key) {
5433 prev_region = Some(next_region);
5434 continue;
5435 }
5436
5437 let next_region_start = next_region.range.start.value.unwrap();
5438 let next_region_end = if let Some(region) = cursor.region() {
5439 region.range.start.value.unwrap()
5440 } else {
5441 self.max_point()
5442 };
5443
5444 let prev = prev_region.as_ref().map(|region| ExcerptInfo {
5445 id: region.excerpt.id,
5446 buffer: region.excerpt.buffer.clone(),
5447 buffer_id: region.excerpt.buffer_id,
5448 range: region.excerpt.range.clone(),
5449 end_row: MultiBufferRow(next_region_start.row),
5450 });
5451
5452 let next = ExcerptInfo {
5453 id: next_region.excerpt.id,
5454 buffer: next_region.excerpt.buffer.clone(),
5455 buffer_id: next_region.excerpt.buffer_id,
5456 range: next_region.excerpt.range.clone(),
5457 end_row: if next_region.excerpt.has_trailing_newline {
5458 MultiBufferRow(next_region_end.row - 1)
5459 } else {
5460 MultiBufferRow(next_region_end.row)
5461 },
5462 };
5463
5464 let row = MultiBufferRow(next_region_start.row);
5465
5466 prev_region = Some(next_region);
5467
5468 return Some(ExcerptBoundary { row, prev, next });
5469 }
5470 })
5471 }
5472
5473 pub fn edit_count(&self) -> usize {
5474 self.edit_count
5475 }
5476
5477 pub fn non_text_state_update_count(&self) -> usize {
5478 self.non_text_state_update_count
5479 }
5480
5481 /// Returns the smallest enclosing bracket ranges containing the given range or
5482 /// None if no brackets contain range or the range is not contained in a single
5483 /// excerpt
5484 ///
5485 /// Can optionally pass a range_filter to filter the ranges of brackets to consider
5486 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
5487 &self,
5488 range: Range<T>,
5489 range_filter: Option<&dyn Fn(&BufferSnapshot, Range<usize>, Range<usize>) -> bool>,
5490 ) -> Option<(Range<usize>, Range<usize>)> {
5491 let range = range.start.to_offset(self)..range.end.to_offset(self);
5492 let mut excerpt = self.excerpt_containing(range.clone())?;
5493 let buffer = excerpt.buffer();
5494 let excerpt_buffer_range = excerpt.buffer_range();
5495
5496 // Filter to ranges contained in the excerpt
5497 let range_filter = |open: Range<usize>, close: Range<usize>| -> bool {
5498 excerpt_buffer_range.contains(&open.start)
5499 && excerpt_buffer_range.contains(&close.end)
5500 && range_filter.map_or(true, |filter| filter(buffer, open, close))
5501 };
5502
5503 let (open, close) = excerpt.buffer().innermost_enclosing_bracket_ranges(
5504 excerpt.map_range_to_buffer(range),
5505 Some(&range_filter),
5506 )?;
5507
5508 Some((
5509 excerpt.map_range_from_buffer(open),
5510 excerpt.map_range_from_buffer(close),
5511 ))
5512 }
5513
5514 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5515 /// not contained in a single excerpt
5516 pub fn enclosing_bracket_ranges<T: ToOffset>(
5517 &self,
5518 range: Range<T>,
5519 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + '_> {
5520 let range = range.start.to_offset(self)..range.end.to_offset(self);
5521 let mut excerpt = self.excerpt_containing(range.clone())?;
5522
5523 Some(
5524 excerpt
5525 .buffer()
5526 .enclosing_bracket_ranges(excerpt.map_range_to_buffer(range))
5527 .filter_map(move |pair| {
5528 if excerpt.contains_buffer_range(pair.open_range.start..pair.close_range.end) {
5529 Some((
5530 excerpt.map_range_from_buffer(pair.open_range),
5531 excerpt.map_range_from_buffer(pair.close_range),
5532 ))
5533 } else {
5534 None
5535 }
5536 }),
5537 )
5538 }
5539
5540 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5541 /// not contained in a single excerpt
5542 pub fn text_object_ranges<T: ToOffset>(
5543 &self,
5544 range: Range<T>,
5545 options: TreeSitterOptions,
5546 ) -> impl Iterator<Item = (Range<usize>, TextObject)> + '_ {
5547 let range = range.start.to_offset(self)..range.end.to_offset(self);
5548 self.excerpt_containing(range.clone())
5549 .map(|mut excerpt| {
5550 excerpt
5551 .buffer()
5552 .text_object_ranges(excerpt.map_range_to_buffer(range), options)
5553 .filter_map(move |(range, text_object)| {
5554 if excerpt.contains_buffer_range(range.clone()) {
5555 Some((excerpt.map_range_from_buffer(range), text_object))
5556 } else {
5557 None
5558 }
5559 })
5560 })
5561 .into_iter()
5562 .flatten()
5563 }
5564
5565 /// Returns bracket range pairs overlapping the given `range` or returns None if the `range` is
5566 /// not contained in a single excerpt
5567 pub fn bracket_ranges<T: ToOffset>(
5568 &self,
5569 range: Range<T>,
5570 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + '_> {
5571 let range = range.start.to_offset(self)..range.end.to_offset(self);
5572 let mut excerpt = self.excerpt_containing(range.clone())?;
5573
5574 Some(
5575 excerpt
5576 .buffer()
5577 .bracket_ranges(excerpt.map_range_to_buffer(range))
5578 .filter_map(move |pair| {
5579 let buffer_range = pair.open_range.start..pair.close_range.end;
5580 if excerpt.contains_buffer_range(buffer_range) {
5581 Some((
5582 excerpt.map_range_from_buffer(pair.open_range),
5583 excerpt.map_range_from_buffer(pair.close_range),
5584 ))
5585 } else {
5586 None
5587 }
5588 }),
5589 )
5590 }
5591
5592 pub fn redacted_ranges<'a, T: ToOffset>(
5593 &'a self,
5594 range: Range<T>,
5595 redaction_enabled: impl Fn(Option<&Arc<dyn File>>) -> bool + 'a,
5596 ) -> impl Iterator<Item = Range<usize>> + 'a {
5597 let range = range.start.to_offset(self)..range.end.to_offset(self);
5598 self.lift_buffer_metadata(range, move |buffer, range| {
5599 if redaction_enabled(buffer.file()) {
5600 Some(buffer.redacted_ranges(range).map(|range| (range, ())))
5601 } else {
5602 None
5603 }
5604 })
5605 .map(|(range, _, _)| range)
5606 }
5607
5608 pub fn runnable_ranges(
5609 &self,
5610 range: Range<Anchor>,
5611 ) -> impl Iterator<Item = language::RunnableRange> + '_ {
5612 let range = range.start.to_offset(self)..range.end.to_offset(self);
5613 self.lift_buffer_metadata(range, move |buffer, range| {
5614 Some(
5615 buffer
5616 .runnable_ranges(range.clone())
5617 .filter(move |runnable| {
5618 runnable.run_range.start >= range.start
5619 && runnable.run_range.end < range.end
5620 })
5621 .map(|runnable| (runnable.run_range.clone(), runnable)),
5622 )
5623 })
5624 .map(|(run_range, runnable, _)| language::RunnableRange {
5625 run_range,
5626 ..runnable
5627 })
5628 }
5629
5630 pub fn line_indents(
5631 &self,
5632 start_row: MultiBufferRow,
5633 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5634 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5635 let max_point = self.max_point();
5636 let mut cursor = self.cursor::<Point>();
5637 cursor.seek(&Point::new(start_row.0, 0));
5638 iter::from_fn(move || {
5639 let mut region = cursor.region()?;
5640 while !buffer_filter(®ion.excerpt.buffer) {
5641 cursor.next();
5642 region = cursor.region()?;
5643 }
5644 let overshoot = start_row.0.saturating_sub(region.range.start.row);
5645 let buffer_start_row =
5646 (region.buffer_range.start.row + overshoot).min(region.buffer_range.end.row);
5647
5648 let buffer_end_row = if region.is_main_buffer
5649 && (region.has_trailing_newline || region.range.end == max_point)
5650 {
5651 region.buffer_range.end.row
5652 } else {
5653 region.buffer_range.end.row.saturating_sub(1)
5654 };
5655
5656 let line_indents = region
5657 .buffer
5658 .line_indents_in_row_range(buffer_start_row..buffer_end_row);
5659 cursor.next();
5660 return Some(line_indents.map(move |(buffer_row, indent)| {
5661 let row = region.range.start.row + (buffer_row - region.buffer_range.start.row);
5662 (MultiBufferRow(row), indent, ®ion.excerpt.buffer)
5663 }));
5664 })
5665 .flatten()
5666 }
5667
5668 pub fn reversed_line_indents(
5669 &self,
5670 end_row: MultiBufferRow,
5671 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5672 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5673 let max_point = self.max_point();
5674 let mut cursor = self.cursor::<Point>();
5675 cursor.seek(&Point::new(end_row.0, 0));
5676 iter::from_fn(move || {
5677 let mut region = cursor.region()?;
5678 while !buffer_filter(®ion.excerpt.buffer) {
5679 cursor.prev();
5680 region = cursor.region()?;
5681 }
5682
5683 let buffer_start_row = region.buffer_range.start.row;
5684 let buffer_end_row = if region.is_main_buffer
5685 && (region.has_trailing_newline || region.range.end == max_point)
5686 {
5687 region.buffer_range.end.row + 1
5688 } else {
5689 region.buffer_range.end.row
5690 };
5691
5692 let overshoot = end_row.0 - region.range.start.row;
5693 let buffer_end_row =
5694 (region.buffer_range.start.row + overshoot + 1).min(buffer_end_row);
5695
5696 let line_indents = region
5697 .buffer
5698 .reversed_line_indents_in_row_range(buffer_start_row..buffer_end_row);
5699 cursor.prev();
5700 return Some(line_indents.map(move |(buffer_row, indent)| {
5701 let row = region.range.start.row + (buffer_row - region.buffer_range.start.row);
5702 (MultiBufferRow(row), indent, ®ion.excerpt.buffer)
5703 }));
5704 })
5705 .flatten()
5706 }
5707
5708 pub async fn enclosing_indent(
5709 &self,
5710 mut target_row: MultiBufferRow,
5711 ) -> Option<(Range<MultiBufferRow>, LineIndent)> {
5712 let max_row = MultiBufferRow(self.max_point().row);
5713 if target_row >= max_row {
5714 return None;
5715 }
5716
5717 let mut target_indent = self.line_indent_for_row(target_row);
5718
5719 // If the current row is at the start of an indented block, we want to return this
5720 // block as the enclosing indent.
5721 if !target_indent.is_line_empty() && target_row < max_row {
5722 let next_line_indent = self.line_indent_for_row(MultiBufferRow(target_row.0 + 1));
5723 if !next_line_indent.is_line_empty()
5724 && target_indent.raw_len() < next_line_indent.raw_len()
5725 {
5726 target_indent = next_line_indent;
5727 target_row.0 += 1;
5728 }
5729 }
5730
5731 const SEARCH_ROW_LIMIT: u32 = 25000;
5732 const SEARCH_WHITESPACE_ROW_LIMIT: u32 = 2500;
5733 const YIELD_INTERVAL: u32 = 100;
5734
5735 let mut accessed_row_counter = 0;
5736
5737 // If there is a blank line at the current row, search for the next non indented lines
5738 if target_indent.is_line_empty() {
5739 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_WHITESPACE_ROW_LIMIT));
5740 let end =
5741 MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_WHITESPACE_ROW_LIMIT));
5742
5743 let mut non_empty_line_above = None;
5744 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5745 if row < start {
5746 break;
5747 }
5748 accessed_row_counter += 1;
5749 if accessed_row_counter == YIELD_INTERVAL {
5750 accessed_row_counter = 0;
5751 yield_now().await;
5752 }
5753 if !indent.is_line_empty() {
5754 non_empty_line_above = Some((row, indent));
5755 break;
5756 }
5757 }
5758
5759 let mut non_empty_line_below = None;
5760 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5761 if row > end {
5762 break;
5763 }
5764 accessed_row_counter += 1;
5765 if accessed_row_counter == YIELD_INTERVAL {
5766 accessed_row_counter = 0;
5767 yield_now().await;
5768 }
5769 if !indent.is_line_empty() {
5770 non_empty_line_below = Some((row, indent));
5771 break;
5772 }
5773 }
5774
5775 let (row, indent) = match (non_empty_line_above, non_empty_line_below) {
5776 (Some((above_row, above_indent)), Some((below_row, below_indent))) => {
5777 if above_indent.raw_len() >= below_indent.raw_len() {
5778 (above_row, above_indent)
5779 } else {
5780 (below_row, below_indent)
5781 }
5782 }
5783 (Some(above), None) => above,
5784 (None, Some(below)) => below,
5785 _ => return None,
5786 };
5787
5788 target_indent = indent;
5789 target_row = row;
5790 }
5791
5792 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_ROW_LIMIT));
5793 let end = MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_ROW_LIMIT));
5794
5795 let mut start_indent = None;
5796 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5797 if row < start {
5798 break;
5799 }
5800 accessed_row_counter += 1;
5801 if accessed_row_counter == YIELD_INTERVAL {
5802 accessed_row_counter = 0;
5803 yield_now().await;
5804 }
5805 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5806 start_indent = Some((row, indent));
5807 break;
5808 }
5809 }
5810 let (start_row, start_indent_size) = start_indent?;
5811
5812 let mut end_indent = (end, None);
5813 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5814 if row > end {
5815 break;
5816 }
5817 accessed_row_counter += 1;
5818 if accessed_row_counter == YIELD_INTERVAL {
5819 accessed_row_counter = 0;
5820 yield_now().await;
5821 }
5822 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5823 end_indent = (MultiBufferRow(row.0.saturating_sub(1)), Some(indent));
5824 break;
5825 }
5826 }
5827 let (end_row, end_indent_size) = end_indent;
5828
5829 let indent = if let Some(end_indent_size) = end_indent_size {
5830 if start_indent_size.raw_len() > end_indent_size.raw_len() {
5831 start_indent_size
5832 } else {
5833 end_indent_size
5834 }
5835 } else {
5836 start_indent_size
5837 };
5838
5839 Some((start_row..end_row, indent))
5840 }
5841
5842 pub fn indent_guides_in_range<T: ToPoint>(
5843 &self,
5844 range: Range<T>,
5845 ignore_disabled_for_language: bool,
5846 cx: &App,
5847 ) -> impl Iterator<Item = IndentGuide> {
5848 let range = range.start.to_point(self)..range.end.to_point(self);
5849 let start_row = MultiBufferRow(range.start.row);
5850 let end_row = MultiBufferRow(range.end.row);
5851
5852 let mut row_indents = self.line_indents(start_row, |buffer| {
5853 let settings =
5854 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx);
5855 settings.indent_guides.enabled || ignore_disabled_for_language
5856 });
5857
5858 let mut result = Vec::new();
5859 let mut indent_stack = SmallVec::<[IndentGuide; 8]>::new();
5860
5861 let mut prev_settings = None;
5862 while let Some((first_row, mut line_indent, buffer)) = row_indents.next() {
5863 if first_row > end_row {
5864 break;
5865 }
5866 let current_depth = indent_stack.len() as u32;
5867
5868 // Avoid retrieving the language settings repeatedly for every buffer row.
5869 if let Some((prev_buffer_id, _)) = &prev_settings {
5870 if prev_buffer_id != &buffer.remote_id() {
5871 prev_settings.take();
5872 }
5873 }
5874 let settings = &prev_settings
5875 .get_or_insert_with(|| {
5876 (
5877 buffer.remote_id(),
5878 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx),
5879 )
5880 })
5881 .1;
5882 let tab_size = settings.tab_size.get();
5883
5884 // When encountering empty, continue until found useful line indent
5885 // then add to the indent stack with the depth found
5886 let mut found_indent = false;
5887 let mut last_row = first_row;
5888 if line_indent.is_line_blank() {
5889 while !found_indent {
5890 let Some((target_row, new_line_indent, _)) = row_indents.next() else {
5891 break;
5892 };
5893 const TRAILING_ROW_SEARCH_LIMIT: u32 = 25;
5894 if target_row > MultiBufferRow(end_row.0 + TRAILING_ROW_SEARCH_LIMIT) {
5895 break;
5896 }
5897
5898 if new_line_indent.is_line_blank() {
5899 continue;
5900 }
5901 last_row = target_row.min(end_row);
5902 line_indent = new_line_indent;
5903 found_indent = true;
5904 break;
5905 }
5906 } else {
5907 found_indent = true
5908 }
5909
5910 let depth = if found_indent {
5911 line_indent.len(tab_size) / tab_size
5912 + ((line_indent.len(tab_size) % tab_size) > 0) as u32
5913 } else {
5914 0
5915 };
5916
5917 match depth.cmp(¤t_depth) {
5918 cmp::Ordering::Less => {
5919 for _ in 0..(current_depth - depth) {
5920 let mut indent = indent_stack.pop().unwrap();
5921 if last_row != first_row {
5922 // In this case, we landed on an empty row, had to seek forward,
5923 // and discovered that the indent we where on is ending.
5924 // This means that the last display row must
5925 // be on line that ends this indent range, so we
5926 // should display the range up to the first non-empty line
5927 indent.end_row = MultiBufferRow(first_row.0.saturating_sub(1));
5928 }
5929
5930 result.push(indent)
5931 }
5932 }
5933 cmp::Ordering::Greater => {
5934 for next_depth in current_depth..depth {
5935 indent_stack.push(IndentGuide {
5936 buffer_id: buffer.remote_id(),
5937 start_row: first_row,
5938 end_row: last_row,
5939 depth: next_depth,
5940 tab_size,
5941 settings: settings.indent_guides,
5942 });
5943 }
5944 }
5945 _ => {}
5946 }
5947
5948 for indent in indent_stack.iter_mut() {
5949 indent.end_row = last_row;
5950 }
5951 }
5952
5953 result.extend(indent_stack);
5954 result.into_iter()
5955 }
5956
5957 pub fn trailing_excerpt_update_count(&self) -> usize {
5958 self.trailing_excerpt_update_count
5959 }
5960
5961 pub fn file_at<T: ToOffset>(&self, point: T) -> Option<&Arc<dyn File>> {
5962 self.point_to_buffer_offset(point)
5963 .and_then(|(buffer, _)| buffer.file())
5964 }
5965
5966 pub fn language_at<T: ToOffset>(&self, point: T) -> Option<&Arc<Language>> {
5967 self.point_to_buffer_offset(point)
5968 .and_then(|(buffer, offset)| buffer.language_at(offset))
5969 }
5970
5971 fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
5972 self.excerpts
5973 .first()
5974 .map(|excerpt| &excerpt.buffer)
5975 .map(|buffer| {
5976 language_settings(
5977 buffer.language().map(|language| language.name()),
5978 buffer.file(),
5979 cx,
5980 )
5981 })
5982 .unwrap_or_else(move || self.language_settings_at(0, cx))
5983 }
5984
5985 pub fn language_settings_at<'a, T: ToOffset>(
5986 &'a self,
5987 point: T,
5988 cx: &'a App,
5989 ) -> Cow<'a, LanguageSettings> {
5990 let mut language = None;
5991 let mut file = None;
5992 if let Some((buffer, offset)) = self.point_to_buffer_offset(point) {
5993 language = buffer.language_at(offset);
5994 file = buffer.file();
5995 }
5996 language_settings(language.map(|l| l.name()), file, cx)
5997 }
5998
5999 pub fn language_scope_at<T: ToOffset>(&self, point: T) -> Option<LanguageScope> {
6000 self.point_to_buffer_offset(point)
6001 .and_then(|(buffer, offset)| buffer.language_scope_at(offset))
6002 }
6003
6004 pub fn char_classifier_at<T: ToOffset>(&self, point: T) -> CharClassifier {
6005 self.point_to_buffer_offset(point)
6006 .map(|(buffer, offset)| buffer.char_classifier_at(offset))
6007 .unwrap_or_default()
6008 }
6009
6010 pub fn language_indent_size_at<T: ToOffset>(
6011 &self,
6012 position: T,
6013 cx: &App,
6014 ) -> Option<IndentSize> {
6015 let (buffer_snapshot, offset) = self.point_to_buffer_offset(position)?;
6016 Some(buffer_snapshot.language_indent_size_at(offset, cx))
6017 }
6018
6019 pub fn is_dirty(&self) -> bool {
6020 self.is_dirty
6021 }
6022
6023 pub fn has_deleted_file(&self) -> bool {
6024 self.has_deleted_file
6025 }
6026
6027 pub fn has_conflict(&self) -> bool {
6028 self.has_conflict
6029 }
6030
6031 pub fn has_diagnostics(&self) -> bool {
6032 self.excerpts
6033 .iter()
6034 .any(|excerpt| excerpt.buffer.has_diagnostics())
6035 }
6036
6037 pub fn diagnostic_group(
6038 &self,
6039 buffer_id: BufferId,
6040 group_id: usize,
6041 ) -> impl Iterator<Item = DiagnosticEntry<Point>> + '_ {
6042 self.lift_buffer_metadata(Point::zero()..self.max_point(), move |buffer, range| {
6043 if buffer.remote_id() != buffer_id {
6044 return None;
6045 };
6046 Some(
6047 buffer
6048 .diagnostics_in_range(range, false)
6049 .filter(move |diagnostic| diagnostic.diagnostic.group_id == group_id)
6050 .map(move |DiagnosticEntry { diagnostic, range }| (range, diagnostic)),
6051 )
6052 })
6053 .map(|(range, diagnostic, _)| DiagnosticEntry { diagnostic, range })
6054 }
6055
6056 pub fn diagnostics_in_range<'a, T>(
6057 &'a self,
6058 range: Range<T>,
6059 ) -> impl Iterator<Item = DiagnosticEntry<T>> + 'a
6060 where
6061 T: 'a
6062 + text::ToOffset
6063 + text::FromAnchor
6064 + TextDimension
6065 + Ord
6066 + Sub<T, Output = T>
6067 + fmt::Debug,
6068 {
6069 self.lift_buffer_metadata(range, move |buffer, buffer_range| {
6070 Some(
6071 buffer
6072 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
6073 .map(|entry| (entry.range, entry.diagnostic)),
6074 )
6075 })
6076 .map(|(range, diagnostic, _)| DiagnosticEntry { diagnostic, range })
6077 }
6078
6079 pub fn diagnostics_with_buffer_ids_in_range<'a, T>(
6080 &'a self,
6081 range: Range<T>,
6082 ) -> impl Iterator<Item = (BufferId, DiagnosticEntry<T>)> + 'a
6083 where
6084 T: 'a
6085 + text::ToOffset
6086 + text::FromAnchor
6087 + TextDimension
6088 + Ord
6089 + Sub<T, Output = T>
6090 + fmt::Debug,
6091 {
6092 self.lift_buffer_metadata(range, move |buffer, buffer_range| {
6093 Some(
6094 buffer
6095 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
6096 .map(|entry| (entry.range, entry.diagnostic)),
6097 )
6098 })
6099 .map(|(range, diagnostic, b)| (b.buffer_id, DiagnosticEntry { diagnostic, range }))
6100 }
6101
6102 pub fn syntax_ancestor<T: ToOffset>(
6103 &self,
6104 range: Range<T>,
6105 ) -> Option<(tree_sitter::Node<'_>, MultiOrSingleBufferOffsetRange)> {
6106 let range = range.start.to_offset(self)..range.end.to_offset(self);
6107 let mut excerpt = self.excerpt_containing(range.clone())?;
6108 let node = excerpt
6109 .buffer()
6110 .syntax_ancestor(excerpt.map_range_to_buffer(range))?;
6111 let node_range = node.byte_range();
6112 let range = if excerpt.contains_buffer_range(node_range.clone()) {
6113 MultiOrSingleBufferOffsetRange::Multi(excerpt.map_range_from_buffer(node_range))
6114 } else {
6115 MultiOrSingleBufferOffsetRange::Single(node_range)
6116 };
6117 Some((node, range))
6118 }
6119
6120 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
6121 let (excerpt_id, _, buffer) = self.as_singleton()?;
6122 let outline = buffer.outline(theme)?;
6123 Some(Outline::new(
6124 outline
6125 .items
6126 .into_iter()
6127 .flat_map(|item| {
6128 Some(OutlineItem {
6129 depth: item.depth,
6130 range: self.anchor_in_excerpt(*excerpt_id, item.range.start)?
6131 ..self.anchor_in_excerpt(*excerpt_id, item.range.end)?,
6132 text: item.text,
6133 highlight_ranges: item.highlight_ranges,
6134 name_ranges: item.name_ranges,
6135 body_range: item.body_range.and_then(|body_range| {
6136 Some(
6137 self.anchor_in_excerpt(*excerpt_id, body_range.start)?
6138 ..self.anchor_in_excerpt(*excerpt_id, body_range.end)?,
6139 )
6140 }),
6141 annotation_range: item.annotation_range.and_then(|annotation_range| {
6142 Some(
6143 self.anchor_in_excerpt(*excerpt_id, annotation_range.start)?
6144 ..self.anchor_in_excerpt(*excerpt_id, annotation_range.end)?,
6145 )
6146 }),
6147 })
6148 })
6149 .collect(),
6150 ))
6151 }
6152
6153 pub fn symbols_containing<T: ToOffset>(
6154 &self,
6155 offset: T,
6156 theme: Option<&SyntaxTheme>,
6157 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
6158 let anchor = self.anchor_before(offset);
6159 let excerpt_id = anchor.excerpt_id;
6160 let excerpt = self.excerpt(excerpt_id)?;
6161 Some((
6162 excerpt.buffer_id,
6163 excerpt
6164 .buffer
6165 .symbols_containing(anchor.text_anchor, theme)
6166 .into_iter()
6167 .flatten()
6168 .flat_map(|item| {
6169 Some(OutlineItem {
6170 depth: item.depth,
6171 range: self.anchor_in_excerpt(excerpt_id, item.range.start)?
6172 ..self.anchor_in_excerpt(excerpt_id, item.range.end)?,
6173 text: item.text,
6174 highlight_ranges: item.highlight_ranges,
6175 name_ranges: item.name_ranges,
6176 body_range: item.body_range.and_then(|body_range| {
6177 Some(
6178 self.anchor_in_excerpt(excerpt_id, body_range.start)?
6179 ..self.anchor_in_excerpt(excerpt_id, body_range.end)?,
6180 )
6181 }),
6182 annotation_range: item.annotation_range.and_then(|body_range| {
6183 Some(
6184 self.anchor_in_excerpt(excerpt_id, body_range.start)?
6185 ..self.anchor_in_excerpt(excerpt_id, body_range.end)?,
6186 )
6187 }),
6188 })
6189 })
6190 .collect(),
6191 ))
6192 }
6193
6194 fn excerpt_locator_for_id(&self, id: ExcerptId) -> &Locator {
6195 if id == ExcerptId::min() {
6196 Locator::min_ref()
6197 } else if id == ExcerptId::max() {
6198 Locator::max_ref()
6199 } else {
6200 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>(&());
6201 cursor.seek(&id, Bias::Left, &());
6202 if let Some(entry) = cursor.item() {
6203 if entry.id == id {
6204 return &entry.locator;
6205 }
6206 }
6207 panic!("invalid excerpt id {id:?}")
6208 }
6209 }
6210
6211 /// Returns the locators referenced by the given excerpt IDs, sorted by locator.
6212 fn excerpt_locators_for_ids(
6213 &self,
6214 ids: impl IntoIterator<Item = ExcerptId>,
6215 ) -> SmallVec<[Locator; 1]> {
6216 let mut sorted_ids = ids.into_iter().collect::<SmallVec<[_; 1]>>();
6217 sorted_ids.sort_unstable();
6218 let mut locators = SmallVec::new();
6219
6220 while sorted_ids.last() == Some(&ExcerptId::max()) {
6221 sorted_ids.pop();
6222 if let Some(mapping) = self.excerpt_ids.last() {
6223 locators.push(mapping.locator.clone());
6224 }
6225 }
6226
6227 let mut sorted_ids = sorted_ids.into_iter().dedup().peekable();
6228 if sorted_ids.peek() == Some(&ExcerptId::min()) {
6229 sorted_ids.next();
6230 if let Some(mapping) = self.excerpt_ids.first() {
6231 locators.push(mapping.locator.clone());
6232 }
6233 }
6234
6235 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>(&());
6236 for id in sorted_ids {
6237 if cursor.seek_forward(&id, Bias::Left, &()) {
6238 locators.push(cursor.item().unwrap().locator.clone());
6239 } else {
6240 panic!("invalid excerpt id {:?}", id);
6241 }
6242 }
6243
6244 locators.sort_unstable();
6245 locators
6246 }
6247
6248 pub fn buffer_id_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<BufferId> {
6249 Some(self.excerpt(excerpt_id)?.buffer_id)
6250 }
6251
6252 pub fn buffer_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<&BufferSnapshot> {
6253 Some(&self.excerpt(excerpt_id)?.buffer)
6254 }
6255
6256 pub fn range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<Point>> {
6257 let mut cursor = self
6258 .excerpts
6259 .cursor::<(Option<&Locator>, ExcerptDimension<Point>)>(&());
6260 let locator = self.excerpt_locator_for_id(excerpt_id);
6261 if cursor.seek(&Some(locator), Bias::Left, &()) {
6262 let start = cursor.start().1.clone();
6263 let end = cursor.end(&()).1;
6264 let mut diff_transforms = self
6265 .diff_transforms
6266 .cursor::<(ExcerptDimension<Point>, OutputDimension<Point>)>(&());
6267 diff_transforms.seek(&start, Bias::Left, &());
6268 let overshoot = start.0 - diff_transforms.start().0.0;
6269 let start = diff_transforms.start().1.0 + overshoot;
6270 diff_transforms.seek(&end, Bias::Right, &());
6271 let overshoot = end.0 - diff_transforms.start().0.0;
6272 let end = diff_transforms.start().1.0 + overshoot;
6273 Some(start..end)
6274 } else {
6275 None
6276 }
6277 }
6278
6279 pub fn buffer_range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<text::Anchor>> {
6280 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
6281 let locator = self.excerpt_locator_for_id(excerpt_id);
6282 if cursor.seek(&Some(locator), Bias::Left, &()) {
6283 if let Some(excerpt) = cursor.item() {
6284 return Some(excerpt.range.context.clone());
6285 }
6286 }
6287 None
6288 }
6289
6290 fn excerpt(&self, excerpt_id: ExcerptId) -> Option<&Excerpt> {
6291 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(&());
6292 let locator = self.excerpt_locator_for_id(excerpt_id);
6293 cursor.seek(&Some(locator), Bias::Left, &());
6294 if let Some(excerpt) = cursor.item() {
6295 if excerpt.id == excerpt_id {
6296 return Some(excerpt);
6297 }
6298 }
6299 None
6300 }
6301
6302 /// Returns the excerpt containing range and its offset start within the multibuffer or none if `range` spans multiple excerpts
6303 pub fn excerpt_containing<T: ToOffset>(
6304 &self,
6305 range: Range<T>,
6306 ) -> Option<MultiBufferExcerpt<'_>> {
6307 let range = range.start.to_offset(self)..range.end.to_offset(self);
6308 let mut cursor = self.cursor::<usize>();
6309 cursor.seek(&range.start);
6310
6311 let start_excerpt = cursor.excerpt()?;
6312 if range.end != range.start {
6313 cursor.seek_forward(&range.end);
6314 if cursor.excerpt()?.id != start_excerpt.id {
6315 return None;
6316 }
6317 }
6318
6319 cursor.seek_to_start_of_current_excerpt();
6320 let region = cursor.region()?;
6321 let offset = region.range.start;
6322 let buffer_offset = start_excerpt.buffer_start_offset();
6323 let excerpt_offset = cursor.excerpts.start().clone();
6324 Some(MultiBufferExcerpt {
6325 diff_transforms: cursor.diff_transforms,
6326 excerpt: start_excerpt,
6327 offset,
6328 buffer_offset,
6329 excerpt_offset,
6330 })
6331 }
6332
6333 pub fn selections_in_range<'a>(
6334 &'a self,
6335 range: &'a Range<Anchor>,
6336 include_local: bool,
6337 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
6338 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(&());
6339 let start_locator = self.excerpt_locator_for_id(range.start.excerpt_id);
6340 let end_locator = self.excerpt_locator_for_id(range.end.excerpt_id);
6341 cursor.seek(start_locator, Bias::Left, &());
6342 cursor
6343 .take_while(move |excerpt| excerpt.locator <= *end_locator)
6344 .flat_map(move |excerpt| {
6345 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
6346 if excerpt.id == range.start.excerpt_id {
6347 query_range.start = range.start.text_anchor;
6348 }
6349 if excerpt.id == range.end.excerpt_id {
6350 query_range.end = range.end.text_anchor;
6351 }
6352
6353 excerpt
6354 .buffer
6355 .selections_in_range(query_range, include_local)
6356 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
6357 selections.map(move |selection| {
6358 let mut start = Anchor {
6359 buffer_id: Some(excerpt.buffer_id),
6360 excerpt_id: excerpt.id,
6361 text_anchor: selection.start,
6362 diff_base_anchor: None,
6363 };
6364 let mut end = Anchor {
6365 buffer_id: Some(excerpt.buffer_id),
6366 excerpt_id: excerpt.id,
6367 text_anchor: selection.end,
6368 diff_base_anchor: None,
6369 };
6370 if range.start.cmp(&start, self).is_gt() {
6371 start = range.start;
6372 }
6373 if range.end.cmp(&end, self).is_lt() {
6374 end = range.end;
6375 }
6376
6377 (
6378 replica_id,
6379 line_mode,
6380 cursor_shape,
6381 Selection {
6382 id: selection.id,
6383 start,
6384 end,
6385 reversed: selection.reversed,
6386 goal: selection.goal,
6387 },
6388 )
6389 })
6390 })
6391 })
6392 }
6393
6394 pub fn show_headers(&self) -> bool {
6395 self.show_headers
6396 }
6397
6398 pub fn diff_for_buffer_id(&self, buffer_id: BufferId) -> Option<&BufferDiffSnapshot> {
6399 self.diffs.get(&buffer_id)
6400 }
6401}
6402
6403#[cfg(any(test, feature = "test-support"))]
6404impl MultiBufferSnapshot {
6405 pub fn random_byte_range(&self, start_offset: usize, rng: &mut impl rand::Rng) -> Range<usize> {
6406 let end = self.clip_offset(rng.gen_range(start_offset..=self.len()), Bias::Right);
6407 let start = self.clip_offset(rng.gen_range(start_offset..=end), Bias::Right);
6408 start..end
6409 }
6410
6411 #[cfg(any(test, feature = "test-support"))]
6412 fn check_invariants(&self) {
6413 let excerpts = self.excerpts.items(&());
6414 let excerpt_ids = self.excerpt_ids.items(&());
6415
6416 for (ix, excerpt) in excerpts.iter().enumerate() {
6417 if ix == 0 {
6418 if excerpt.locator <= Locator::min() {
6419 panic!("invalid first excerpt locator {:?}", excerpt.locator);
6420 }
6421 } else if excerpt.locator <= excerpts[ix - 1].locator {
6422 panic!("excerpts are out-of-order: {:?}", excerpts);
6423 }
6424 }
6425
6426 for (ix, entry) in excerpt_ids.iter().enumerate() {
6427 if ix == 0 {
6428 if entry.id.cmp(&ExcerptId::min(), &self).is_le() {
6429 panic!("invalid first excerpt id {:?}", entry.id);
6430 }
6431 } else if entry.id <= excerpt_ids[ix - 1].id {
6432 panic!("excerpt ids are out-of-order: {:?}", excerpt_ids);
6433 }
6434 }
6435
6436 if self.diff_transforms.summary().input != self.excerpts.summary().text {
6437 panic!(
6438 "incorrect input summary. expected {:?}, got {:?}. transforms: {:+?}",
6439 self.excerpts.summary().text.len,
6440 self.diff_transforms.summary().input,
6441 self.diff_transforms.items(&()),
6442 );
6443 }
6444
6445 let mut prev_transform: Option<&DiffTransform> = None;
6446 for item in self.diff_transforms.iter() {
6447 if let DiffTransform::BufferContent {
6448 summary,
6449 inserted_hunk_info,
6450 } = item
6451 {
6452 if let Some(DiffTransform::BufferContent {
6453 inserted_hunk_info: prev_inserted_hunk_info,
6454 ..
6455 }) = prev_transform
6456 {
6457 if *inserted_hunk_info == *prev_inserted_hunk_info {
6458 panic!(
6459 "multiple adjacent buffer content transforms with is_inserted_hunk = {inserted_hunk_info:?}. transforms: {:+?}",
6460 self.diff_transforms.items(&())
6461 );
6462 }
6463 }
6464 if summary.len == 0 && !self.is_empty() {
6465 panic!("empty buffer content transform");
6466 }
6467 }
6468 prev_transform = Some(item);
6469 }
6470 }
6471}
6472
6473impl<'a, D> MultiBufferCursor<'a, D>
6474where
6475 D: TextDimension + Ord + Sub<D, Output = D>,
6476{
6477 fn seek(&mut self, position: &D) {
6478 self.cached_region.take();
6479 self.diff_transforms
6480 .seek(&OutputDimension(*position), Bias::Right, &());
6481 if self.diff_transforms.item().is_none()
6482 && *position == self.diff_transforms.start().output_dimension.0
6483 {
6484 self.diff_transforms.prev(&());
6485 }
6486
6487 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension.0;
6488 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6489 let overshoot = *position - self.diff_transforms.start().output_dimension.0;
6490 excerpt_position.add_assign(&overshoot);
6491 }
6492
6493 self.excerpts
6494 .seek(&ExcerptDimension(excerpt_position), Bias::Right, &());
6495 if self.excerpts.item().is_none() && excerpt_position == self.excerpts.start().0 {
6496 self.excerpts.prev(&());
6497 }
6498 }
6499
6500 fn seek_forward(&mut self, position: &D) {
6501 self.cached_region.take();
6502 self.diff_transforms
6503 .seek_forward(&OutputDimension(*position), Bias::Right, &());
6504 if self.diff_transforms.item().is_none()
6505 && *position == self.diff_transforms.start().output_dimension.0
6506 {
6507 self.diff_transforms.prev(&());
6508 }
6509
6510 let overshoot = *position - self.diff_transforms.start().output_dimension.0;
6511 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension.0;
6512 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6513 excerpt_position.add_assign(&overshoot);
6514 }
6515
6516 self.excerpts
6517 .seek_forward(&ExcerptDimension(excerpt_position), Bias::Right, &());
6518 if self.excerpts.item().is_none() && excerpt_position == self.excerpts.start().0 {
6519 self.excerpts.prev(&());
6520 }
6521 }
6522
6523 fn next_excerpt(&mut self) {
6524 self.excerpts.next(&());
6525 self.seek_to_start_of_current_excerpt();
6526 }
6527
6528 fn prev_excerpt(&mut self) {
6529 self.excerpts.prev(&());
6530 self.seek_to_start_of_current_excerpt();
6531 }
6532
6533 fn seek_to_start_of_current_excerpt(&mut self) {
6534 self.cached_region.take();
6535 self.diff_transforms
6536 .seek(self.excerpts.start(), Bias::Left, &());
6537 if self.diff_transforms.end(&()).excerpt_dimension == *self.excerpts.start()
6538 && self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6539 && self.diff_transforms.next_item().is_some()
6540 {
6541 self.diff_transforms.next(&());
6542 }
6543 }
6544
6545 fn next(&mut self) {
6546 self.cached_region.take();
6547 match self
6548 .diff_transforms
6549 .end(&())
6550 .excerpt_dimension
6551 .cmp(&self.excerpts.end(&()))
6552 {
6553 cmp::Ordering::Less => self.diff_transforms.next(&()),
6554 cmp::Ordering::Greater => self.excerpts.next(&()),
6555 cmp::Ordering::Equal => {
6556 self.diff_transforms.next(&());
6557 if self.diff_transforms.end(&()).excerpt_dimension > self.excerpts.end(&())
6558 || self.diff_transforms.item().is_none()
6559 {
6560 self.excerpts.next(&());
6561 } else if let Some(DiffTransform::DeletedHunk { hunk_info, .. }) =
6562 self.diff_transforms.item()
6563 {
6564 if self
6565 .excerpts
6566 .item()
6567 .map_or(false, |excerpt| excerpt.id != hunk_info.excerpt_id)
6568 {
6569 self.excerpts.next(&());
6570 }
6571 }
6572 }
6573 }
6574 }
6575
6576 fn prev(&mut self) {
6577 self.cached_region.take();
6578 match self
6579 .diff_transforms
6580 .start()
6581 .excerpt_dimension
6582 .cmp(self.excerpts.start())
6583 {
6584 cmp::Ordering::Less => self.excerpts.prev(&()),
6585 cmp::Ordering::Greater => self.diff_transforms.prev(&()),
6586 cmp::Ordering::Equal => {
6587 self.diff_transforms.prev(&());
6588 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6589 || self.diff_transforms.item().is_none()
6590 {
6591 self.excerpts.prev(&());
6592 }
6593 }
6594 }
6595 }
6596
6597 fn region(&mut self) -> Option<MultiBufferRegion<'a, D>> {
6598 if self.cached_region.is_none() {
6599 self.cached_region = self.build_region();
6600 }
6601 self.cached_region.clone()
6602 }
6603
6604 fn is_at_start_of_excerpt(&mut self) -> bool {
6605 if self.diff_transforms.start().excerpt_dimension > *self.excerpts.start() {
6606 return false;
6607 } else if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
6608 return true;
6609 }
6610
6611 self.diff_transforms.prev(&());
6612 let prev_transform = self.diff_transforms.item();
6613 self.diff_transforms.next(&());
6614
6615 prev_transform.map_or(true, |next_transform| {
6616 matches!(next_transform, DiffTransform::BufferContent { .. })
6617 })
6618 }
6619
6620 fn is_at_end_of_excerpt(&mut self) -> bool {
6621 if self.diff_transforms.end(&()).excerpt_dimension < self.excerpts.end(&()) {
6622 return false;
6623 } else if self.diff_transforms.end(&()).excerpt_dimension > self.excerpts.end(&())
6624 || self.diff_transforms.item().is_none()
6625 {
6626 return true;
6627 }
6628
6629 let next_transform = self.diff_transforms.next_item();
6630 next_transform.map_or(true, |next_transform| match next_transform {
6631 DiffTransform::BufferContent { .. } => true,
6632 DiffTransform::DeletedHunk { hunk_info, .. } => self
6633 .excerpts
6634 .item()
6635 .map_or(false, |excerpt| excerpt.id != hunk_info.excerpt_id),
6636 })
6637 }
6638
6639 fn main_buffer_position(&self) -> Option<D> {
6640 let excerpt = self.excerpts.item()?;
6641 let buffer = &excerpt.buffer;
6642 let buffer_context_start = excerpt.range.context.start.summary::<D>(buffer);
6643 let mut buffer_start = buffer_context_start;
6644 let overshoot = self.diff_transforms.end(&()).excerpt_dimension.0 - self.excerpts.start().0;
6645 buffer_start.add_assign(&overshoot);
6646 Some(buffer_start)
6647 }
6648
6649 fn build_region(&self) -> Option<MultiBufferRegion<'a, D>> {
6650 let excerpt = self.excerpts.item()?;
6651 match self.diff_transforms.item()? {
6652 DiffTransform::DeletedHunk {
6653 buffer_id,
6654 base_text_byte_range,
6655 has_trailing_newline,
6656 hunk_info,
6657 ..
6658 } => {
6659 let diff = self.diffs.get(&buffer_id)?;
6660 let buffer = diff.base_text();
6661 let mut rope_cursor = buffer.as_rope().cursor(0);
6662 let buffer_start = rope_cursor.summary::<D>(base_text_byte_range.start);
6663 let buffer_range_len = rope_cursor.summary::<D>(base_text_byte_range.end);
6664 let mut buffer_end = buffer_start;
6665 buffer_end.add_assign(&buffer_range_len);
6666 let start = self.diff_transforms.start().output_dimension.0;
6667 let end = self.diff_transforms.end(&()).output_dimension.0;
6668 return Some(MultiBufferRegion {
6669 buffer,
6670 excerpt,
6671 has_trailing_newline: *has_trailing_newline,
6672 is_main_buffer: false,
6673 diff_hunk_status: Some(DiffHunkStatus::deleted(
6674 hunk_info.hunk_secondary_status,
6675 )),
6676 buffer_range: buffer_start..buffer_end,
6677 range: start..end,
6678 });
6679 }
6680 DiffTransform::BufferContent {
6681 inserted_hunk_info, ..
6682 } => {
6683 let buffer = &excerpt.buffer;
6684 let buffer_context_start = excerpt.range.context.start.summary::<D>(buffer);
6685
6686 let mut start = self.diff_transforms.start().output_dimension.0;
6687 let mut buffer_start = buffer_context_start;
6688 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
6689 let overshoot =
6690 self.excerpts.start().0 - self.diff_transforms.start().excerpt_dimension.0;
6691 start.add_assign(&overshoot);
6692 } else {
6693 let overshoot =
6694 self.diff_transforms.start().excerpt_dimension.0 - self.excerpts.start().0;
6695 buffer_start.add_assign(&overshoot);
6696 }
6697
6698 let mut end;
6699 let mut buffer_end;
6700 let has_trailing_newline;
6701 if self.diff_transforms.end(&()).excerpt_dimension.0 < self.excerpts.end(&()).0 {
6702 let overshoot =
6703 self.diff_transforms.end(&()).excerpt_dimension.0 - self.excerpts.start().0;
6704 end = self.diff_transforms.end(&()).output_dimension.0;
6705 buffer_end = buffer_context_start;
6706 buffer_end.add_assign(&overshoot);
6707 has_trailing_newline = false;
6708 } else {
6709 let overshoot =
6710 self.excerpts.end(&()).0 - self.diff_transforms.start().excerpt_dimension.0;
6711 end = self.diff_transforms.start().output_dimension.0;
6712 end.add_assign(&overshoot);
6713 buffer_end = excerpt.range.context.end.summary::<D>(buffer);
6714 has_trailing_newline = excerpt.has_trailing_newline;
6715 };
6716
6717 Some(MultiBufferRegion {
6718 buffer,
6719 excerpt,
6720 has_trailing_newline,
6721 is_main_buffer: true,
6722 diff_hunk_status: inserted_hunk_info
6723 .map(|info| DiffHunkStatus::added(info.hunk_secondary_status)),
6724 buffer_range: buffer_start..buffer_end,
6725 range: start..end,
6726 })
6727 }
6728 }
6729 }
6730
6731 fn excerpt(&self) -> Option<&'a Excerpt> {
6732 self.excerpts.item()
6733 }
6734}
6735
6736impl History {
6737 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
6738 self.transaction_depth += 1;
6739 if self.transaction_depth == 1 {
6740 let id = self.next_transaction_id.tick();
6741 self.undo_stack.push(Transaction {
6742 id,
6743 buffer_transactions: Default::default(),
6744 first_edit_at: now,
6745 last_edit_at: now,
6746 suppress_grouping: false,
6747 });
6748 Some(id)
6749 } else {
6750 None
6751 }
6752 }
6753
6754 fn end_transaction(
6755 &mut self,
6756 now: Instant,
6757 buffer_transactions: HashMap<BufferId, TransactionId>,
6758 ) -> bool {
6759 assert_ne!(self.transaction_depth, 0);
6760 self.transaction_depth -= 1;
6761 if self.transaction_depth == 0 {
6762 if buffer_transactions.is_empty() {
6763 self.undo_stack.pop();
6764 false
6765 } else {
6766 self.redo_stack.clear();
6767 let transaction = self.undo_stack.last_mut().unwrap();
6768 transaction.last_edit_at = now;
6769 for (buffer_id, transaction_id) in buffer_transactions {
6770 transaction
6771 .buffer_transactions
6772 .entry(buffer_id)
6773 .or_insert(transaction_id);
6774 }
6775 true
6776 }
6777 } else {
6778 false
6779 }
6780 }
6781
6782 fn push_transaction<'a, T>(
6783 &mut self,
6784 buffer_transactions: T,
6785 now: Instant,
6786 cx: &Context<MultiBuffer>,
6787 ) where
6788 T: IntoIterator<Item = (&'a Entity<Buffer>, &'a language::Transaction)>,
6789 {
6790 assert_eq!(self.transaction_depth, 0);
6791 let transaction = Transaction {
6792 id: self.next_transaction_id.tick(),
6793 buffer_transactions: buffer_transactions
6794 .into_iter()
6795 .map(|(buffer, transaction)| (buffer.read(cx).remote_id(), transaction.id))
6796 .collect(),
6797 first_edit_at: now,
6798 last_edit_at: now,
6799 suppress_grouping: false,
6800 };
6801 if !transaction.buffer_transactions.is_empty() {
6802 self.undo_stack.push(transaction);
6803 self.redo_stack.clear();
6804 }
6805 }
6806
6807 fn finalize_last_transaction(&mut self) {
6808 if let Some(transaction) = self.undo_stack.last_mut() {
6809 transaction.suppress_grouping = true;
6810 }
6811 }
6812
6813 fn forget(&mut self, transaction_id: TransactionId) -> Option<Transaction> {
6814 if let Some(ix) = self
6815 .undo_stack
6816 .iter()
6817 .rposition(|transaction| transaction.id == transaction_id)
6818 {
6819 Some(self.undo_stack.remove(ix))
6820 } else if let Some(ix) = self
6821 .redo_stack
6822 .iter()
6823 .rposition(|transaction| transaction.id == transaction_id)
6824 {
6825 Some(self.redo_stack.remove(ix))
6826 } else {
6827 None
6828 }
6829 }
6830
6831 fn transaction(&self, transaction_id: TransactionId) -> Option<&Transaction> {
6832 self.undo_stack
6833 .iter()
6834 .find(|transaction| transaction.id == transaction_id)
6835 .or_else(|| {
6836 self.redo_stack
6837 .iter()
6838 .find(|transaction| transaction.id == transaction_id)
6839 })
6840 }
6841
6842 fn transaction_mut(&mut self, transaction_id: TransactionId) -> Option<&mut Transaction> {
6843 self.undo_stack
6844 .iter_mut()
6845 .find(|transaction| transaction.id == transaction_id)
6846 .or_else(|| {
6847 self.redo_stack
6848 .iter_mut()
6849 .find(|transaction| transaction.id == transaction_id)
6850 })
6851 }
6852
6853 fn pop_undo(&mut self) -> Option<&mut Transaction> {
6854 assert_eq!(self.transaction_depth, 0);
6855 if let Some(transaction) = self.undo_stack.pop() {
6856 self.redo_stack.push(transaction);
6857 self.redo_stack.last_mut()
6858 } else {
6859 None
6860 }
6861 }
6862
6863 fn pop_redo(&mut self) -> Option<&mut Transaction> {
6864 assert_eq!(self.transaction_depth, 0);
6865 if let Some(transaction) = self.redo_stack.pop() {
6866 self.undo_stack.push(transaction);
6867 self.undo_stack.last_mut()
6868 } else {
6869 None
6870 }
6871 }
6872
6873 fn remove_from_undo(&mut self, transaction_id: TransactionId) -> Option<&Transaction> {
6874 let ix = self
6875 .undo_stack
6876 .iter()
6877 .rposition(|transaction| transaction.id == transaction_id)?;
6878 let transaction = self.undo_stack.remove(ix);
6879 self.redo_stack.push(transaction);
6880 self.redo_stack.last()
6881 }
6882
6883 fn group(&mut self) -> Option<TransactionId> {
6884 let mut count = 0;
6885 let mut transactions = self.undo_stack.iter();
6886 if let Some(mut transaction) = transactions.next_back() {
6887 while let Some(prev_transaction) = transactions.next_back() {
6888 if !prev_transaction.suppress_grouping
6889 && transaction.first_edit_at - prev_transaction.last_edit_at
6890 <= self.group_interval
6891 {
6892 transaction = prev_transaction;
6893 count += 1;
6894 } else {
6895 break;
6896 }
6897 }
6898 }
6899 self.group_trailing(count)
6900 }
6901
6902 fn group_until(&mut self, transaction_id: TransactionId) {
6903 let mut count = 0;
6904 for transaction in self.undo_stack.iter().rev() {
6905 if transaction.id == transaction_id {
6906 self.group_trailing(count);
6907 break;
6908 } else if transaction.suppress_grouping {
6909 break;
6910 } else {
6911 count += 1;
6912 }
6913 }
6914 }
6915
6916 fn group_trailing(&mut self, n: usize) -> Option<TransactionId> {
6917 let new_len = self.undo_stack.len() - n;
6918 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
6919 if let Some(last_transaction) = transactions_to_keep.last_mut() {
6920 if let Some(transaction) = transactions_to_merge.last() {
6921 last_transaction.last_edit_at = transaction.last_edit_at;
6922 }
6923 for to_merge in transactions_to_merge {
6924 for (buffer_id, transaction_id) in &to_merge.buffer_transactions {
6925 last_transaction
6926 .buffer_transactions
6927 .entry(*buffer_id)
6928 .or_insert(*transaction_id);
6929 }
6930 }
6931 }
6932
6933 self.undo_stack.truncate(new_len);
6934 self.undo_stack.last().map(|t| t.id)
6935 }
6936}
6937
6938impl Excerpt {
6939 fn new(
6940 id: ExcerptId,
6941 locator: Locator,
6942 buffer_id: BufferId,
6943 buffer: BufferSnapshot,
6944 range: ExcerptRange<text::Anchor>,
6945 has_trailing_newline: bool,
6946 ) -> Self {
6947 Excerpt {
6948 id,
6949 locator,
6950 max_buffer_row: range.context.end.to_point(&buffer).row,
6951 text_summary: buffer
6952 .text_summary_for_range::<TextSummary, _>(range.context.to_offset(&buffer)),
6953 buffer_id,
6954 buffer,
6955 range,
6956 has_trailing_newline,
6957 }
6958 }
6959
6960 fn chunks_in_range(&self, range: Range<usize>, language_aware: bool) -> ExcerptChunks<'_> {
6961 let content_start = self.range.context.start.to_offset(&self.buffer);
6962 let chunks_start = content_start + range.start;
6963 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
6964
6965 let footer_height = if self.has_trailing_newline
6966 && range.start <= self.text_summary.len
6967 && range.end > self.text_summary.len
6968 {
6969 1
6970 } else {
6971 0
6972 };
6973
6974 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
6975
6976 ExcerptChunks {
6977 excerpt_id: self.id,
6978 content_chunks,
6979 footer_height,
6980 }
6981 }
6982
6983 fn seek_chunks(&self, excerpt_chunks: &mut ExcerptChunks, range: Range<usize>) {
6984 let content_start = self.range.context.start.to_offset(&self.buffer);
6985 let chunks_start = content_start + range.start;
6986 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
6987 excerpt_chunks.content_chunks.seek(chunks_start..chunks_end);
6988 excerpt_chunks.footer_height = if self.has_trailing_newline
6989 && range.start <= self.text_summary.len
6990 && range.end > self.text_summary.len
6991 {
6992 1
6993 } else {
6994 0
6995 };
6996 }
6997
6998 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
6999 if text_anchor
7000 .cmp(&self.range.context.start, &self.buffer)
7001 .is_lt()
7002 {
7003 self.range.context.start
7004 } else if text_anchor
7005 .cmp(&self.range.context.end, &self.buffer)
7006 .is_gt()
7007 {
7008 self.range.context.end
7009 } else {
7010 text_anchor
7011 }
7012 }
7013
7014 fn contains(&self, anchor: &Anchor) -> bool {
7015 Some(self.buffer_id) == anchor.buffer_id
7016 && self
7017 .range
7018 .context
7019 .start
7020 .cmp(&anchor.text_anchor, &self.buffer)
7021 .is_le()
7022 && self
7023 .range
7024 .context
7025 .end
7026 .cmp(&anchor.text_anchor, &self.buffer)
7027 .is_ge()
7028 }
7029
7030 /// The [`Excerpt`]'s start offset in its [`Buffer`]
7031 fn buffer_start_offset(&self) -> usize {
7032 self.range.context.start.to_offset(&self.buffer)
7033 }
7034
7035 /// The [`Excerpt`]'s end offset in its [`Buffer`]
7036 fn buffer_end_offset(&self) -> usize {
7037 self.buffer_start_offset() + self.text_summary.len
7038 }
7039}
7040
7041impl<'a> MultiBufferExcerpt<'a> {
7042 pub fn id(&self) -> ExcerptId {
7043 self.excerpt.id
7044 }
7045
7046 pub fn buffer_id(&self) -> BufferId {
7047 self.excerpt.buffer_id
7048 }
7049
7050 pub fn start_anchor(&self) -> Anchor {
7051 Anchor {
7052 buffer_id: Some(self.excerpt.buffer_id),
7053 excerpt_id: self.excerpt.id,
7054 text_anchor: self.excerpt.range.context.start,
7055 diff_base_anchor: None,
7056 }
7057 }
7058
7059 pub fn end_anchor(&self) -> Anchor {
7060 Anchor {
7061 buffer_id: Some(self.excerpt.buffer_id),
7062 excerpt_id: self.excerpt.id,
7063 text_anchor: self.excerpt.range.context.end,
7064 diff_base_anchor: None,
7065 }
7066 }
7067
7068 pub fn buffer(&self) -> &'a BufferSnapshot {
7069 &self.excerpt.buffer
7070 }
7071
7072 pub fn buffer_range(&self) -> Range<usize> {
7073 self.buffer_offset
7074 ..self
7075 .excerpt
7076 .range
7077 .context
7078 .end
7079 .to_offset(&self.excerpt.buffer.text)
7080 }
7081
7082 pub fn start_offset(&self) -> usize {
7083 self.offset
7084 }
7085
7086 /// Maps an offset within the [`MultiBuffer`] to an offset within the [`Buffer`]
7087 pub fn map_offset_to_buffer(&mut self, offset: usize) -> usize {
7088 self.map_range_to_buffer(offset..offset).start
7089 }
7090
7091 /// Maps a range within the [`MultiBuffer`] to a range within the [`Buffer`]
7092 pub fn map_range_to_buffer(&mut self, range: Range<usize>) -> Range<usize> {
7093 self.diff_transforms
7094 .seek(&OutputDimension(range.start), Bias::Right, &());
7095 let start = self.map_offset_to_buffer_internal(range.start);
7096 let end = if range.end > range.start {
7097 self.diff_transforms
7098 .seek_forward(&OutputDimension(range.end), Bias::Right, &());
7099 self.map_offset_to_buffer_internal(range.end)
7100 } else {
7101 start
7102 };
7103 start..end
7104 }
7105
7106 fn map_offset_to_buffer_internal(&self, offset: usize) -> usize {
7107 let mut excerpt_offset = self.diff_transforms.start().excerpt_dimension.clone();
7108 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7109 excerpt_offset.0 += offset - self.diff_transforms.start().output_dimension.0;
7110 };
7111 let offset_in_excerpt = excerpt_offset.0.saturating_sub(self.excerpt_offset.0);
7112 self.buffer_offset + offset_in_excerpt
7113 }
7114
7115 /// Map an offset within the [`Buffer`] to an offset within the [`MultiBuffer`]
7116 pub fn map_offset_from_buffer(&mut self, buffer_offset: usize) -> usize {
7117 self.map_range_from_buffer(buffer_offset..buffer_offset)
7118 .start
7119 }
7120
7121 /// Map a range within the [`Buffer`] to a range within the [`MultiBuffer`]
7122 pub fn map_range_from_buffer(&mut self, buffer_range: Range<usize>) -> Range<usize> {
7123 if buffer_range.start < self.buffer_offset {
7124 log::warn!(
7125 "Attempting to map a range from a buffer offset that starts before the current buffer offset"
7126 );
7127 return buffer_range;
7128 }
7129 let overshoot = buffer_range.start - self.buffer_offset;
7130 let excerpt_offset = ExcerptDimension(self.excerpt_offset.0 + overshoot);
7131 self.diff_transforms.seek(&excerpt_offset, Bias::Right, &());
7132 if excerpt_offset.0 < self.diff_transforms.start().excerpt_dimension.0 {
7133 log::warn!(
7134 "Attempting to map a range from a buffer offset that starts before the current buffer offset"
7135 );
7136 return buffer_range;
7137 }
7138 let overshoot = excerpt_offset.0 - self.diff_transforms.start().excerpt_dimension.0;
7139 let start = self.diff_transforms.start().output_dimension.0 + overshoot;
7140
7141 let end = if buffer_range.end > buffer_range.start {
7142 let overshoot = buffer_range.end - self.buffer_offset;
7143 let excerpt_offset = ExcerptDimension(self.excerpt_offset.0 + overshoot);
7144 self.diff_transforms
7145 .seek_forward(&excerpt_offset, Bias::Right, &());
7146 let overshoot = excerpt_offset.0 - self.diff_transforms.start().excerpt_dimension.0;
7147 self.diff_transforms.start().output_dimension.0 + overshoot
7148 } else {
7149 start
7150 };
7151
7152 start..end
7153 }
7154
7155 /// Returns true if the entirety of the given range is in the buffer's excerpt
7156 pub fn contains_buffer_range(&self, range: Range<usize>) -> bool {
7157 range.start >= self.excerpt.buffer_start_offset()
7158 && range.end <= self.excerpt.buffer_end_offset()
7159 }
7160
7161 pub fn max_buffer_row(&self) -> u32 {
7162 self.excerpt.max_buffer_row
7163 }
7164}
7165
7166impl ExcerptId {
7167 pub fn min() -> Self {
7168 Self(0)
7169 }
7170
7171 pub fn max() -> Self {
7172 Self(usize::MAX)
7173 }
7174
7175 pub fn to_proto(&self) -> u64 {
7176 self.0 as _
7177 }
7178
7179 pub fn from_proto(proto: u64) -> Self {
7180 Self(proto as _)
7181 }
7182
7183 pub fn cmp(&self, other: &Self, snapshot: &MultiBufferSnapshot) -> cmp::Ordering {
7184 let a = snapshot.excerpt_locator_for_id(*self);
7185 let b = snapshot.excerpt_locator_for_id(*other);
7186 a.cmp(b).then_with(|| self.0.cmp(&other.0))
7187 }
7188}
7189
7190impl From<ExcerptId> for usize {
7191 fn from(val: ExcerptId) -> Self {
7192 val.0
7193 }
7194}
7195
7196impl fmt::Debug for Excerpt {
7197 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
7198 f.debug_struct("Excerpt")
7199 .field("id", &self.id)
7200 .field("locator", &self.locator)
7201 .field("buffer_id", &self.buffer_id)
7202 .field("range", &self.range)
7203 .field("text_summary", &self.text_summary)
7204 .field("has_trailing_newline", &self.has_trailing_newline)
7205 .finish()
7206 }
7207}
7208
7209impl sum_tree::Item for Excerpt {
7210 type Summary = ExcerptSummary;
7211
7212 fn summary(&self, _cx: &()) -> Self::Summary {
7213 let mut text = self.text_summary;
7214 if self.has_trailing_newline {
7215 text += TextSummary::from("\n");
7216 }
7217 ExcerptSummary {
7218 excerpt_id: self.id,
7219 excerpt_locator: self.locator.clone(),
7220 widest_line_number: self.max_buffer_row,
7221 text,
7222 }
7223 }
7224}
7225
7226impl sum_tree::Item for ExcerptIdMapping {
7227 type Summary = ExcerptId;
7228
7229 fn summary(&self, _cx: &()) -> Self::Summary {
7230 self.id
7231 }
7232}
7233
7234impl sum_tree::KeyedItem for ExcerptIdMapping {
7235 type Key = ExcerptId;
7236
7237 fn key(&self) -> Self::Key {
7238 self.id
7239 }
7240}
7241
7242impl DiffTransform {
7243 fn hunk_info(&self) -> Option<DiffTransformHunkInfo> {
7244 match self {
7245 DiffTransform::DeletedHunk { hunk_info, .. } => Some(*hunk_info),
7246 DiffTransform::BufferContent {
7247 inserted_hunk_info, ..
7248 } => *inserted_hunk_info,
7249 }
7250 }
7251}
7252
7253impl sum_tree::Item for DiffTransform {
7254 type Summary = DiffTransformSummary;
7255
7256 fn summary(&self, _: &<Self::Summary as sum_tree::Summary>::Context) -> Self::Summary {
7257 match self {
7258 DiffTransform::BufferContent { summary, .. } => DiffTransformSummary {
7259 input: *summary,
7260 output: *summary,
7261 },
7262 DiffTransform::DeletedHunk { summary, .. } => DiffTransformSummary {
7263 input: TextSummary::default(),
7264 output: *summary,
7265 },
7266 }
7267 }
7268}
7269
7270impl DiffTransformSummary {
7271 fn excerpt_len(&self) -> ExcerptOffset {
7272 ExcerptOffset::new(self.input.len)
7273 }
7274}
7275
7276impl sum_tree::Summary for DiffTransformSummary {
7277 type Context = ();
7278
7279 fn zero(_: &Self::Context) -> Self {
7280 DiffTransformSummary {
7281 input: TextSummary::default(),
7282 output: TextSummary::default(),
7283 }
7284 }
7285
7286 fn add_summary(&mut self, summary: &Self, _: &Self::Context) {
7287 self.input += &summary.input;
7288 self.output += &summary.output;
7289 }
7290}
7291
7292impl sum_tree::Summary for ExcerptId {
7293 type Context = ();
7294
7295 fn zero(_cx: &()) -> Self {
7296 Default::default()
7297 }
7298
7299 fn add_summary(&mut self, other: &Self, _: &()) {
7300 *self = *other;
7301 }
7302}
7303
7304impl sum_tree::Summary for ExcerptSummary {
7305 type Context = ();
7306
7307 fn zero(_cx: &()) -> Self {
7308 Default::default()
7309 }
7310
7311 fn add_summary(&mut self, summary: &Self, _: &()) {
7312 debug_assert!(summary.excerpt_locator > self.excerpt_locator);
7313 self.excerpt_locator = summary.excerpt_locator.clone();
7314 Summary::add_summary(&mut self.text, &summary.text, &());
7315 self.widest_line_number = cmp::max(self.widest_line_number, summary.widest_line_number);
7316 }
7317}
7318
7319impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for ExcerptOffset {
7320 fn zero(_cx: &()) -> Self {
7321 Default::default()
7322 }
7323
7324 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7325 self.value += summary.text.len;
7326 }
7327}
7328
7329impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for ExcerptOffset {
7330 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
7331 Ord::cmp(&self.value, &cursor_location.text.len)
7332 }
7333}
7334
7335impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, Option<&'a Locator>> for Locator {
7336 fn cmp(&self, cursor_location: &Option<&'a Locator>, _: &()) -> cmp::Ordering {
7337 Ord::cmp(&Some(self), cursor_location)
7338 }
7339}
7340
7341impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for Locator {
7342 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
7343 Ord::cmp(self, &cursor_location.excerpt_locator)
7344 }
7345}
7346
7347impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for ExcerptPoint {
7348 fn zero(_cx: &()) -> Self {
7349 Default::default()
7350 }
7351
7352 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7353 self.value += summary.text.lines;
7354 }
7355}
7356
7357impl<'a, D: TextDimension + Default> sum_tree::Dimension<'a, ExcerptSummary>
7358 for ExcerptDimension<D>
7359{
7360 fn zero(_: &()) -> Self {
7361 ExcerptDimension(D::default())
7362 }
7363
7364 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7365 self.0.add_assign(&D::from_text_summary(&summary.text))
7366 }
7367}
7368
7369impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a Locator> {
7370 fn zero(_cx: &()) -> Self {
7371 Default::default()
7372 }
7373
7374 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7375 *self = Some(&summary.excerpt_locator);
7376 }
7377}
7378
7379impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<ExcerptId> {
7380 fn zero(_cx: &()) -> Self {
7381 Default::default()
7382 }
7383
7384 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
7385 *self = Some(summary.excerpt_id);
7386 }
7387}
7388
7389#[derive(Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7390struct ExcerptDimension<T>(T);
7391
7392#[derive(Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7393struct OutputDimension<T>(T);
7394
7395impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for ExcerptOffset {
7396 fn zero(_: &()) -> Self {
7397 ExcerptOffset::new(0)
7398 }
7399
7400 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7401 self.value += summary.input.len;
7402 }
7403}
7404
7405impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for ExcerptPoint {
7406 fn zero(_: &()) -> Self {
7407 ExcerptPoint::new(0, 0)
7408 }
7409
7410 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7411 self.value += summary.input.lines;
7412 }
7413}
7414
7415impl<D: TextDimension + Ord> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransformSummary>
7416 for ExcerptDimension<D>
7417{
7418 fn cmp(&self, cursor_location: &DiffTransformSummary, _: &()) -> cmp::Ordering {
7419 Ord::cmp(&self.0, &D::from_text_summary(&cursor_location.input))
7420 }
7421}
7422
7423impl<D: TextDimension + Ord> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransforms<D>>
7424 for ExcerptDimension<D>
7425{
7426 fn cmp(&self, cursor_location: &DiffTransforms<D>, _: &()) -> cmp::Ordering {
7427 Ord::cmp(&self.0, &cursor_location.excerpt_dimension.0)
7428 }
7429}
7430
7431impl<'a, D: TextDimension> sum_tree::Dimension<'a, DiffTransformSummary> for ExcerptDimension<D> {
7432 fn zero(_: &()) -> Self {
7433 ExcerptDimension(D::default())
7434 }
7435
7436 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7437 self.0.add_assign(&D::from_text_summary(&summary.input))
7438 }
7439}
7440
7441impl<D: TextDimension + Ord> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransforms<D>>
7442 for OutputDimension<D>
7443{
7444 fn cmp(&self, cursor_location: &DiffTransforms<D>, _: &()) -> cmp::Ordering {
7445 Ord::cmp(&self.0, &cursor_location.output_dimension.0)
7446 }
7447}
7448
7449impl<'a, D: TextDimension> sum_tree::Dimension<'a, DiffTransformSummary> for OutputDimension<D> {
7450 fn zero(_: &()) -> Self {
7451 OutputDimension(D::default())
7452 }
7453
7454 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7455 self.0.add_assign(&D::from_text_summary(&summary.output))
7456 }
7457}
7458
7459impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for TextSummary {
7460 fn zero(_: &()) -> Self {
7461 TextSummary::default()
7462 }
7463
7464 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7465 *self += summary.output
7466 }
7467}
7468
7469impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for usize {
7470 fn zero(_: &()) -> Self {
7471 0
7472 }
7473
7474 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7475 *self += summary.output.len
7476 }
7477}
7478
7479impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for Point {
7480 fn zero(_: &()) -> Self {
7481 Point::new(0, 0)
7482 }
7483
7484 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: &()) {
7485 *self += summary.output.lines
7486 }
7487}
7488
7489impl MultiBufferRows<'_> {
7490 pub fn seek(&mut self, MultiBufferRow(row): MultiBufferRow) {
7491 self.point = Point::new(row, 0);
7492 self.cursor.seek(&self.point);
7493 }
7494}
7495
7496impl Iterator for MultiBufferRows<'_> {
7497 type Item = RowInfo;
7498
7499 fn next(&mut self) -> Option<Self::Item> {
7500 if self.is_empty && self.point.row == 0 {
7501 self.point += Point::new(1, 0);
7502 return Some(RowInfo {
7503 buffer_id: None,
7504 buffer_row: Some(0),
7505 multibuffer_row: Some(MultiBufferRow(0)),
7506 diff_status: None,
7507 expand_info: None,
7508 });
7509 }
7510
7511 let mut region = self.cursor.region()?;
7512 while self.point >= region.range.end {
7513 self.cursor.next();
7514 if let Some(next_region) = self.cursor.region() {
7515 region = next_region;
7516 } else {
7517 if self.point == self.cursor.diff_transforms.end(&()).output_dimension.0 {
7518 let multibuffer_row = MultiBufferRow(self.point.row);
7519 let last_excerpt = self
7520 .cursor
7521 .excerpts
7522 .item()
7523 .or(self.cursor.excerpts.prev_item())?;
7524 let last_row = last_excerpt
7525 .range
7526 .context
7527 .end
7528 .to_point(&last_excerpt.buffer)
7529 .row;
7530
7531 let first_row = last_excerpt
7532 .range
7533 .context
7534 .start
7535 .to_point(&last_excerpt.buffer)
7536 .row;
7537
7538 let expand_info = if self.is_singleton {
7539 None
7540 } else {
7541 let needs_expand_up = first_row == last_row
7542 && last_row > 0
7543 && !region.diff_hunk_status.is_some_and(|d| d.is_deleted());
7544 let needs_expand_down = last_row < last_excerpt.buffer.max_point().row;
7545
7546 if needs_expand_up && needs_expand_down {
7547 Some(ExpandExcerptDirection::UpAndDown)
7548 } else if needs_expand_up {
7549 Some(ExpandExcerptDirection::Up)
7550 } else if needs_expand_down {
7551 Some(ExpandExcerptDirection::Down)
7552 } else {
7553 None
7554 }
7555 .map(|direction| ExpandInfo {
7556 direction,
7557 excerpt_id: last_excerpt.id,
7558 })
7559 };
7560 self.point += Point::new(1, 0);
7561 return Some(RowInfo {
7562 buffer_id: Some(last_excerpt.buffer_id),
7563 buffer_row: Some(last_row),
7564 multibuffer_row: Some(multibuffer_row),
7565 diff_status: None,
7566 expand_info,
7567 });
7568 } else {
7569 return None;
7570 }
7571 };
7572 }
7573
7574 let overshoot = self.point - region.range.start;
7575 let buffer_point = region.buffer_range.start + overshoot;
7576 let expand_info = if self.is_singleton {
7577 None
7578 } else {
7579 let needs_expand_up = self.point.row == region.range.start.row
7580 && self.cursor.is_at_start_of_excerpt()
7581 && buffer_point.row > 0;
7582 let needs_expand_down = (region.excerpt.has_trailing_newline
7583 && self.point.row + 1 == region.range.end.row
7584 || !region.excerpt.has_trailing_newline && self.point.row == region.range.end.row)
7585 && self.cursor.is_at_end_of_excerpt()
7586 && buffer_point.row < region.buffer.max_point().row;
7587
7588 if needs_expand_up && needs_expand_down {
7589 Some(ExpandExcerptDirection::UpAndDown)
7590 } else if needs_expand_up {
7591 Some(ExpandExcerptDirection::Up)
7592 } else if needs_expand_down {
7593 Some(ExpandExcerptDirection::Down)
7594 } else {
7595 None
7596 }
7597 .map(|direction| ExpandInfo {
7598 direction,
7599 excerpt_id: region.excerpt.id,
7600 })
7601 };
7602
7603 let result = Some(RowInfo {
7604 buffer_id: Some(region.buffer.remote_id()),
7605 buffer_row: Some(buffer_point.row),
7606 multibuffer_row: Some(MultiBufferRow(self.point.row)),
7607 diff_status: region
7608 .diff_hunk_status
7609 .filter(|_| self.point < region.range.end),
7610 expand_info,
7611 });
7612 self.point += Point::new(1, 0);
7613 result
7614 }
7615}
7616
7617impl<'a> MultiBufferChunks<'a> {
7618 pub fn offset(&self) -> usize {
7619 self.range.start
7620 }
7621
7622 pub fn seek(&mut self, range: Range<usize>) {
7623 self.diff_transforms.seek(&range.end, Bias::Right, &());
7624 let mut excerpt_end = self.diff_transforms.start().1;
7625 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7626 let overshoot = range.end - self.diff_transforms.start().0;
7627 excerpt_end.value += overshoot;
7628 }
7629
7630 self.diff_transforms.seek(&range.start, Bias::Right, &());
7631 let mut excerpt_start = self.diff_transforms.start().1;
7632 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7633 let overshoot = range.start - self.diff_transforms.start().0;
7634 excerpt_start.value += overshoot;
7635 }
7636
7637 self.seek_to_excerpt_offset_range(excerpt_start..excerpt_end);
7638 self.buffer_chunk.take();
7639 self.range = range;
7640 }
7641
7642 fn seek_to_excerpt_offset_range(&mut self, new_range: Range<ExcerptOffset>) {
7643 self.excerpt_offset_range = new_range.clone();
7644 self.excerpts.seek(&new_range.start, Bias::Right, &());
7645 if let Some(excerpt) = self.excerpts.item() {
7646 let excerpt_start = *self.excerpts.start();
7647 if let Some(excerpt_chunks) = self
7648 .excerpt_chunks
7649 .as_mut()
7650 .filter(|chunks| excerpt.id == chunks.excerpt_id)
7651 {
7652 excerpt.seek_chunks(
7653 excerpt_chunks,
7654 (self.excerpt_offset_range.start - excerpt_start).value
7655 ..(self.excerpt_offset_range.end - excerpt_start).value,
7656 );
7657 } else {
7658 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7659 (self.excerpt_offset_range.start - excerpt_start).value
7660 ..(self.excerpt_offset_range.end - excerpt_start).value,
7661 self.language_aware,
7662 ));
7663 }
7664 } else {
7665 self.excerpt_chunks = None;
7666 }
7667 }
7668
7669 fn next_excerpt_chunk(&mut self) -> Option<Chunk<'a>> {
7670 loop {
7671 if self.excerpt_offset_range.is_empty() {
7672 return None;
7673 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
7674 self.excerpt_offset_range.start.value += chunk.text.len();
7675 return Some(chunk);
7676 } else {
7677 self.excerpts.next(&());
7678 let excerpt = self.excerpts.item()?;
7679 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7680 0..(self.excerpt_offset_range.end - *self.excerpts.start()).value,
7681 self.language_aware,
7682 ));
7683 }
7684 }
7685 }
7686}
7687
7688impl<'a> Iterator for ReversedMultiBufferChunks<'a> {
7689 type Item = &'a str;
7690
7691 fn next(&mut self) -> Option<Self::Item> {
7692 let mut region = self.cursor.region()?;
7693 if self.offset == region.range.start {
7694 self.cursor.prev();
7695 region = self.cursor.region()?;
7696 let start_overshoot = self.start.saturating_sub(region.range.start);
7697 self.current_chunks = Some(region.buffer.reversed_chunks_in_range(
7698 region.buffer_range.start + start_overshoot..region.buffer_range.end,
7699 ));
7700 }
7701
7702 if self.offset == region.range.end && region.has_trailing_newline {
7703 self.offset -= 1;
7704 Some("\n")
7705 } else {
7706 let chunk = self.current_chunks.as_mut().unwrap().next()?;
7707 self.offset -= chunk.len();
7708 Some(chunk)
7709 }
7710 }
7711}
7712
7713impl<'a> Iterator for MultiBufferChunks<'a> {
7714 type Item = Chunk<'a>;
7715
7716 fn next(&mut self) -> Option<Chunk<'a>> {
7717 if self.range.start >= self.range.end {
7718 return None;
7719 }
7720 if self.range.start == self.diff_transforms.end(&()).0 {
7721 self.diff_transforms.next(&());
7722 }
7723
7724 let diff_transform_start = self.diff_transforms.start().0;
7725 let diff_transform_end = self.diff_transforms.end(&()).0;
7726 debug_assert!(self.range.start < diff_transform_end);
7727
7728 let diff_transform = self.diff_transforms.item()?;
7729 match diff_transform {
7730 DiffTransform::BufferContent { .. } => {
7731 let chunk = if let Some(chunk) = &mut self.buffer_chunk {
7732 chunk
7733 } else {
7734 let chunk = self.next_excerpt_chunk().unwrap();
7735 self.buffer_chunk.insert(chunk)
7736 };
7737
7738 let chunk_end = self.range.start + chunk.text.len();
7739 let diff_transform_end = diff_transform_end.min(self.range.end);
7740
7741 if diff_transform_end < chunk_end {
7742 let (before, after) =
7743 chunk.text.split_at(diff_transform_end - self.range.start);
7744 self.range.start = diff_transform_end;
7745 chunk.text = after;
7746 Some(Chunk {
7747 text: before,
7748 ..chunk.clone()
7749 })
7750 } else {
7751 self.range.start = chunk_end;
7752 self.buffer_chunk.take()
7753 }
7754 }
7755 DiffTransform::DeletedHunk {
7756 buffer_id,
7757 base_text_byte_range,
7758 has_trailing_newline,
7759 ..
7760 } => {
7761 let base_text_start =
7762 base_text_byte_range.start + self.range.start - diff_transform_start;
7763 let base_text_end =
7764 base_text_byte_range.start + self.range.end - diff_transform_start;
7765 let base_text_end = base_text_end.min(base_text_byte_range.end);
7766
7767 let mut chunks = if let Some((_, mut chunks)) = self
7768 .diff_base_chunks
7769 .take()
7770 .filter(|(id, _)| id == buffer_id)
7771 {
7772 if chunks.range().start != base_text_start || chunks.range().end < base_text_end
7773 {
7774 chunks.seek(base_text_start..base_text_end);
7775 }
7776 chunks
7777 } else {
7778 let base_buffer = &self.diffs.get(&buffer_id)?.base_text();
7779 base_buffer.chunks(base_text_start..base_text_end, self.language_aware)
7780 };
7781
7782 let chunk = if let Some(chunk) = chunks.next() {
7783 self.range.start += chunk.text.len();
7784 self.diff_base_chunks = Some((*buffer_id, chunks));
7785 chunk
7786 } else {
7787 debug_assert!(has_trailing_newline);
7788 self.range.start += "\n".len();
7789 Chunk {
7790 text: "\n",
7791 ..Default::default()
7792 }
7793 };
7794 Some(chunk)
7795 }
7796 }
7797 }
7798}
7799
7800impl MultiBufferBytes<'_> {
7801 fn consume(&mut self, len: usize) {
7802 self.range.start += len;
7803 self.chunk = &self.chunk[len..];
7804
7805 if !self.range.is_empty() && self.chunk.is_empty() {
7806 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
7807 self.chunk = chunk;
7808 } else if self.has_trailing_newline {
7809 self.has_trailing_newline = false;
7810 self.chunk = b"\n";
7811 } else {
7812 self.cursor.next();
7813 if let Some(region) = self.cursor.region() {
7814 let mut excerpt_bytes = region.buffer.bytes_in_range(
7815 region.buffer_range.start
7816 ..(region.buffer_range.start + self.range.end - region.range.start)
7817 .min(region.buffer_range.end),
7818 );
7819 self.chunk = excerpt_bytes.next().unwrap_or(&[]);
7820 self.excerpt_bytes = Some(excerpt_bytes);
7821 self.has_trailing_newline =
7822 region.has_trailing_newline && self.range.end >= region.range.end;
7823 if self.chunk.is_empty() && self.has_trailing_newline {
7824 self.has_trailing_newline = false;
7825 self.chunk = b"\n";
7826 }
7827 }
7828 }
7829 }
7830 }
7831}
7832
7833impl<'a> Iterator for MultiBufferBytes<'a> {
7834 type Item = &'a [u8];
7835
7836 fn next(&mut self) -> Option<Self::Item> {
7837 let chunk = self.chunk;
7838 if chunk.is_empty() {
7839 None
7840 } else {
7841 self.consume(chunk.len());
7842 Some(chunk)
7843 }
7844 }
7845}
7846
7847impl io::Read for MultiBufferBytes<'_> {
7848 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
7849 let len = cmp::min(buf.len(), self.chunk.len());
7850 buf[..len].copy_from_slice(&self.chunk[..len]);
7851 if len > 0 {
7852 self.consume(len);
7853 }
7854 Ok(len)
7855 }
7856}
7857
7858impl io::Read for ReversedMultiBufferBytes<'_> {
7859 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
7860 let len = cmp::min(buf.len(), self.chunk.len());
7861 buf[..len].copy_from_slice(&self.chunk[..len]);
7862 buf[..len].reverse();
7863 if len > 0 {
7864 self.range.end -= len;
7865 self.chunk = &self.chunk[..self.chunk.len() - len];
7866 if !self.range.is_empty() && self.chunk.is_empty() {
7867 if let Some(chunk) = self.chunks.next() {
7868 self.chunk = chunk.as_bytes();
7869 }
7870 }
7871 }
7872 Ok(len)
7873 }
7874}
7875
7876impl<'a> Iterator for ExcerptChunks<'a> {
7877 type Item = Chunk<'a>;
7878
7879 fn next(&mut self) -> Option<Self::Item> {
7880 if let Some(chunk) = self.content_chunks.next() {
7881 return Some(chunk);
7882 }
7883
7884 if self.footer_height > 0 {
7885 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
7886 self.footer_height = 0;
7887 return Some(Chunk {
7888 text,
7889 ..Default::default()
7890 });
7891 }
7892
7893 None
7894 }
7895}
7896
7897impl ToOffset for Point {
7898 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7899 snapshot.point_to_offset(*self)
7900 }
7901}
7902
7903impl ToOffset for usize {
7904 #[track_caller]
7905 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7906 assert!(
7907 *self <= snapshot.len(),
7908 "offset {} is greater than the snapshot.len() {}",
7909 *self,
7910 snapshot.len(),
7911 );
7912 *self
7913 }
7914}
7915
7916impl ToOffset for OffsetUtf16 {
7917 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7918 snapshot.offset_utf16_to_offset(*self)
7919 }
7920}
7921
7922impl ToOffset for PointUtf16 {
7923 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
7924 snapshot.point_utf16_to_offset(*self)
7925 }
7926}
7927
7928impl ToOffsetUtf16 for OffsetUtf16 {
7929 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
7930 *self
7931 }
7932}
7933
7934impl ToOffsetUtf16 for usize {
7935 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
7936 snapshot.offset_to_offset_utf16(*self)
7937 }
7938}
7939
7940impl ToPoint for usize {
7941 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
7942 snapshot.offset_to_point(*self)
7943 }
7944}
7945
7946impl ToPoint for Point {
7947 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
7948 *self
7949 }
7950}
7951
7952impl ToPointUtf16 for usize {
7953 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
7954 snapshot.offset_to_point_utf16(*self)
7955 }
7956}
7957
7958impl ToPointUtf16 for Point {
7959 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
7960 snapshot.point_to_point_utf16(*self)
7961 }
7962}
7963
7964impl ToPointUtf16 for PointUtf16 {
7965 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
7966 *self
7967 }
7968}
7969
7970impl From<ExcerptId> for EntityId {
7971 fn from(id: ExcerptId) -> Self {
7972 EntityId::from(id.0 as u64)
7973 }
7974}