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