1mod anchor;
2#[cfg(test)]
3mod multi_buffer_tests;
4mod path_key;
5mod transaction;
6
7use self::transaction::History;
8
9pub use anchor::{Anchor, AnchorRangeExt};
10
11use anchor::{AnchorSeekTarget, ExcerptAnchor};
12use anyhow::{Result, anyhow};
13use buffer_diff::{
14 BufferDiff, BufferDiffEvent, BufferDiffSnapshot, DiffChanged, DiffHunkSecondaryStatus,
15 DiffHunkStatus, DiffHunkStatusKind,
16};
17use clock::ReplicaId;
18use collections::{BTreeMap, Bound, HashMap, HashSet};
19use gpui::{App, Context, Entity, EventEmitter};
20use itertools::Itertools;
21use language::{
22 AutoindentMode, Buffer, BufferChunks, BufferRow, BufferSnapshot, Capability, CharClassifier,
23 CharKind, CharScopeContext, Chunk, CursorShape, DiagnosticEntryRef, File, IndentGuideSettings,
24 IndentSize, Language, LanguageAwareStyling, LanguageScope, OffsetRangeExt, OffsetUtf16,
25 Outline, OutlineItem, Point, PointUtf16, Selection, TextDimension, TextObject, ToOffset as _,
26 ToPoint as _, TransactionId, TreeSitterOptions, Unclipped,
27 language_settings::{AllLanguageSettings, LanguageSettings},
28};
29
30#[cfg(any(test, feature = "test-support"))]
31use gpui::AppContext as _;
32
33use rope::DimensionPair;
34use settings::Settings;
35use smallvec::SmallVec;
36use smol::future::yield_now;
37use std::{
38 any::type_name,
39 borrow::Cow,
40 cell::{Cell, OnceCell, Ref, RefCell},
41 cmp::{self, Ordering},
42 fmt,
43 future::Future,
44 io,
45 iter::{self, FromIterator},
46 mem,
47 ops::{self, Add, AddAssign, ControlFlow, Range, RangeBounds, Sub, SubAssign},
48 rc::Rc,
49 str,
50 sync::{Arc, OnceLock},
51 time::Duration,
52};
53use sum_tree::{Bias, Cursor, Dimension, Dimensions, SumTree, TreeMap};
54use text::{
55 BufferId, Edit, LineIndent, TextSummary,
56 subscription::{Subscription, Topic},
57};
58use theme::SyntaxTheme;
59use unicode_segmentation::UnicodeSegmentation;
60use ztracing::instrument;
61
62pub use self::path_key::PathKey;
63
64pub static EXCERPT_CONTEXT_LINES: OnceLock<fn(&App) -> u32> = OnceLock::new();
65
66pub fn excerpt_context_lines(cx: &App) -> u32 {
67 EXCERPT_CONTEXT_LINES.get().map(|f| f(cx)).unwrap_or(2)
68}
69
70/// One or more [`Buffers`](Buffer) being edited in a single view.
71///
72/// See <https://zed.dev/features#multi-buffers>
73pub struct MultiBuffer {
74 /// A snapshot of the [`Excerpt`]s in the MultiBuffer.
75 /// Use [`MultiBuffer::snapshot`] to get a up-to-date snapshot.
76 snapshot: RefCell<MultiBufferSnapshot>,
77 /// Contains the state of the buffers being edited
78 buffers: BTreeMap<BufferId, BufferState>,
79 /// Mapping from buffer IDs to their diff states
80 diffs: HashMap<BufferId, DiffState>,
81 subscriptions: Topic<MultiBufferOffset>,
82 /// If true, the multi-buffer only contains a single [`Buffer`] and a single [`Excerpt`]
83 singleton: bool,
84 /// The history of the multi-buffer.
85 history: History,
86 /// The explicit title of the multi-buffer.
87 /// If `None`, it will be derived from the underlying path or content.
88 title: Option<String>,
89 /// The writing capability of the multi-buffer.
90 capability: Capability,
91 buffer_changed_since_sync: Rc<Cell<bool>>,
92}
93
94#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
95struct PathKeyIndex(u64);
96
97#[derive(Clone, Debug, PartialEq, Eq)]
98pub enum Event {
99 BufferRangesUpdated {
100 buffer: Entity<Buffer>,
101 path_key: PathKey,
102 ranges: Vec<ExcerptRange<text::Anchor>>,
103 },
104 BuffersRemoved {
105 removed_buffer_ids: Vec<BufferId>,
106 },
107 BuffersEdited {
108 buffer_ids: Vec<BufferId>,
109 },
110 DiffHunksToggled,
111 Edited {
112 edited_buffer: Option<Entity<Buffer>>,
113 is_local: bool,
114 },
115 TransactionUndone {
116 transaction_id: TransactionId,
117 },
118 Reloaded,
119 LanguageChanged(BufferId, bool),
120 Reparsed(BufferId),
121 Saved,
122 FileHandleChanged,
123 DirtyChanged,
124 DiagnosticsUpdated,
125 BufferDiffChanged,
126}
127
128/// A diff hunk, representing a range of consequent lines in a multibuffer.
129#[derive(Debug, Clone, PartialEq, Eq)]
130pub struct MultiBufferDiffHunk {
131 /// The row range in the multibuffer where this diff hunk appears.
132 pub row_range: Range<MultiBufferRow>,
133 /// The buffer ID that this hunk belongs to.
134 pub buffer_id: BufferId,
135 /// The range of the underlying buffer that this hunk corresponds to.
136 pub buffer_range: Range<text::Anchor>,
137 /// The range within the buffer's diff base that this hunk corresponds to.
138 pub diff_base_byte_range: Range<BufferOffset>,
139 /// The status of this hunk (added/modified/deleted and secondary status).
140 pub status: DiffHunkStatus,
141 /// The word diffs for this hunk.
142 pub word_diffs: Vec<Range<MultiBufferOffset>>,
143 pub excerpt_range: ExcerptRange<text::Anchor>,
144 pub multi_buffer_range: Range<Anchor>,
145}
146
147impl MultiBufferDiffHunk {
148 pub fn status(&self) -> DiffHunkStatus {
149 self.status
150 }
151
152 pub fn is_created_file(&self) -> bool {
153 self.diff_base_byte_range == (BufferOffset(0)..BufferOffset(0))
154 && self.buffer_range.start.is_min()
155 && self.buffer_range.end.is_max()
156 }
157}
158
159pub type MultiBufferPoint = Point;
160/// ExcerptOffset is offset into the non-deleted text of the multibuffer
161type ExcerptOffset = ExcerptDimension<MultiBufferOffset>;
162/// ExcerptOffset is based on the non-deleted text of the multibuffer
163
164#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
165#[serde(transparent)]
166pub struct MultiBufferRow(pub u32);
167
168impl MultiBufferRow {
169 pub const MIN: Self = Self(0);
170 pub const MAX: Self = Self(u32::MAX);
171}
172
173impl ops::Add<usize> for MultiBufferRow {
174 type Output = Self;
175
176 fn add(self, rhs: usize) -> Self::Output {
177 MultiBufferRow(self.0 + rhs as u32)
178 }
179}
180
181pub trait MultiBufferDimension: 'static + Copy + Default + std::fmt::Debug {
182 type TextDimension: TextDimension;
183 fn from_summary(summary: &MBTextSummary) -> Self;
184
185 fn add_text_dim(&mut self, summary: &Self::TextDimension);
186
187 fn add_mb_text_summary(&mut self, summary: &MBTextSummary);
188}
189
190// todo(lw): MultiBufferPoint
191impl MultiBufferDimension for Point {
192 type TextDimension = Point;
193 fn from_summary(summary: &MBTextSummary) -> Self {
194 summary.lines
195 }
196
197 fn add_text_dim(&mut self, other: &Self::TextDimension) {
198 *self += *other;
199 }
200
201 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
202 *self += summary.lines;
203 }
204}
205
206// todo(lw): MultiBufferPointUtf16
207impl MultiBufferDimension for PointUtf16 {
208 type TextDimension = PointUtf16;
209 fn from_summary(summary: &MBTextSummary) -> Self {
210 summary.lines_utf16()
211 }
212
213 fn add_text_dim(&mut self, other: &Self::TextDimension) {
214 *self += *other;
215 }
216
217 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
218 *self += summary.lines_utf16();
219 }
220}
221
222#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
223pub struct MultiBufferOffset(pub usize);
224
225impl fmt::Display for MultiBufferOffset {
226 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
227 write!(f, "{}", self.0)
228 }
229}
230
231impl rand::distr::uniform::SampleUniform for MultiBufferOffset {
232 type Sampler = MultiBufferOffsetUniformSampler;
233}
234
235pub struct MultiBufferOffsetUniformSampler {
236 sampler: rand::distr::uniform::UniformUsize,
237}
238
239impl rand::distr::uniform::UniformSampler for MultiBufferOffsetUniformSampler {
240 type X = MultiBufferOffset;
241
242 fn new<B1, B2>(low_b: B1, high_b: B2) -> Result<Self, rand::distr::uniform::Error>
243 where
244 B1: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
245 B2: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
246 {
247 let low = *low_b.borrow();
248 let high = *high_b.borrow();
249 let sampler = rand::distr::uniform::UniformUsize::new(low.0, high.0);
250 sampler.map(|sampler| MultiBufferOffsetUniformSampler { sampler })
251 }
252
253 #[inline] // if the range is constant, this helps LLVM to do the
254 // calculations at compile-time.
255 fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Result<Self, rand::distr::uniform::Error>
256 where
257 B1: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
258 B2: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
259 {
260 let low = *low_b.borrow();
261 let high = *high_b.borrow();
262 let sampler = rand::distr::uniform::UniformUsize::new_inclusive(low.0, high.0);
263 sampler.map(|sampler| MultiBufferOffsetUniformSampler { sampler })
264 }
265
266 fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> Self::X {
267 MultiBufferOffset(self.sampler.sample(rng))
268 }
269}
270impl MultiBufferDimension for MultiBufferOffset {
271 type TextDimension = usize;
272 fn from_summary(summary: &MBTextSummary) -> Self {
273 summary.len
274 }
275
276 fn add_text_dim(&mut self, other: &Self::TextDimension) {
277 self.0 += *other;
278 }
279
280 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
281 *self += summary.len;
282 }
283}
284impl MultiBufferDimension for MultiBufferOffsetUtf16 {
285 type TextDimension = OffsetUtf16;
286 fn from_summary(summary: &MBTextSummary) -> Self {
287 MultiBufferOffsetUtf16(summary.len_utf16)
288 }
289
290 fn add_text_dim(&mut self, other: &Self::TextDimension) {
291 self.0 += *other;
292 }
293
294 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
295 self.0 += summary.len_utf16;
296 }
297}
298
299#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
300pub struct BufferOffset(pub usize);
301
302impl TextDimension for BufferOffset {
303 fn from_text_summary(summary: &TextSummary) -> Self {
304 BufferOffset(usize::from_text_summary(summary))
305 }
306 fn from_chunk(chunk: rope::ChunkSlice) -> Self {
307 BufferOffset(usize::from_chunk(chunk))
308 }
309 fn add_assign(&mut self, other: &Self) {
310 TextDimension::add_assign(&mut self.0, &other.0);
311 }
312}
313impl<'a> sum_tree::Dimension<'a, rope::ChunkSummary> for BufferOffset {
314 fn zero(cx: ()) -> Self {
315 BufferOffset(<usize as sum_tree::Dimension<'a, rope::ChunkSummary>>::zero(cx))
316 }
317
318 fn add_summary(&mut self, summary: &'a rope::ChunkSummary, cx: ()) {
319 usize::add_summary(&mut self.0, summary, cx);
320 }
321}
322
323impl Sub for BufferOffset {
324 type Output = usize;
325
326 fn sub(self, other: BufferOffset) -> Self::Output {
327 self.0 - other.0
328 }
329}
330
331impl AddAssign<DimensionPair<usize, Point>> for BufferOffset {
332 fn add_assign(&mut self, other: DimensionPair<usize, Point>) {
333 self.0 += other.key;
334 }
335}
336
337impl language::ToPoint for BufferOffset {
338 fn to_point(&self, snapshot: &text::BufferSnapshot) -> Point {
339 self.0.to_point(snapshot)
340 }
341}
342
343impl language::ToPointUtf16 for BufferOffset {
344 fn to_point_utf16(&self, snapshot: &text::BufferSnapshot) -> PointUtf16 {
345 self.0.to_point_utf16(snapshot)
346 }
347}
348
349impl language::ToOffset for BufferOffset {
350 fn to_offset(&self, snapshot: &text::BufferSnapshot) -> usize {
351 self.0.to_offset(snapshot)
352 }
353}
354
355impl language::ToOffsetUtf16 for BufferOffset {
356 fn to_offset_utf16(&self, snapshot: &text::BufferSnapshot) -> OffsetUtf16 {
357 self.0.to_offset_utf16(snapshot)
358 }
359}
360
361#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
362pub struct MultiBufferOffsetUtf16(pub OffsetUtf16);
363
364impl ops::Add<usize> for MultiBufferOffsetUtf16 {
365 type Output = MultiBufferOffsetUtf16;
366
367 fn add(self, rhs: usize) -> Self::Output {
368 MultiBufferOffsetUtf16(OffsetUtf16(self.0.0 + rhs))
369 }
370}
371
372impl ops::Add<OffsetUtf16> for MultiBufferOffsetUtf16 {
373 type Output = Self;
374
375 fn add(self, rhs: OffsetUtf16) -> Self::Output {
376 MultiBufferOffsetUtf16(self.0 + rhs)
377 }
378}
379
380impl AddAssign<OffsetUtf16> for MultiBufferOffsetUtf16 {
381 fn add_assign(&mut self, rhs: OffsetUtf16) {
382 self.0 += rhs;
383 }
384}
385
386impl AddAssign<usize> for MultiBufferOffsetUtf16 {
387 fn add_assign(&mut self, rhs: usize) {
388 self.0.0 += rhs;
389 }
390}
391
392impl Sub for MultiBufferOffsetUtf16 {
393 type Output = OffsetUtf16;
394
395 fn sub(self, other: MultiBufferOffsetUtf16) -> Self::Output {
396 self.0 - other.0
397 }
398}
399
400impl Sub<OffsetUtf16> for MultiBufferOffsetUtf16 {
401 type Output = MultiBufferOffsetUtf16;
402
403 fn sub(self, other: OffsetUtf16) -> Self::Output {
404 MultiBufferOffsetUtf16(self.0 - other)
405 }
406}
407
408#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
409pub struct BufferOffsetUtf16(pub OffsetUtf16);
410
411impl MultiBufferOffset {
412 const ZERO: Self = Self(0);
413 pub fn saturating_sub(self, other: MultiBufferOffset) -> usize {
414 self.0.saturating_sub(other.0)
415 }
416 pub fn saturating_sub_usize(self, other: usize) -> MultiBufferOffset {
417 MultiBufferOffset(self.0.saturating_sub(other))
418 }
419}
420
421impl ops::Sub for MultiBufferOffset {
422 type Output = usize;
423
424 fn sub(self, other: MultiBufferOffset) -> Self::Output {
425 self.0 - other.0
426 }
427}
428
429impl ops::Sub<usize> for MultiBufferOffset {
430 type Output = Self;
431
432 fn sub(self, other: usize) -> Self::Output {
433 MultiBufferOffset(self.0 - other)
434 }
435}
436
437impl ops::SubAssign<usize> for MultiBufferOffset {
438 fn sub_assign(&mut self, other: usize) {
439 self.0 -= other;
440 }
441}
442
443impl ops::Add<usize> for BufferOffset {
444 type Output = Self;
445
446 fn add(self, rhs: usize) -> Self::Output {
447 BufferOffset(self.0 + rhs)
448 }
449}
450
451impl ops::AddAssign<usize> for BufferOffset {
452 fn add_assign(&mut self, other: usize) {
453 self.0 += other;
454 }
455}
456
457impl ops::Add<usize> for MultiBufferOffset {
458 type Output = Self;
459
460 fn add(self, rhs: usize) -> Self::Output {
461 MultiBufferOffset(self.0 + rhs)
462 }
463}
464
465impl ops::AddAssign<usize> for MultiBufferOffset {
466 fn add_assign(&mut self, other: usize) {
467 self.0 += other;
468 }
469}
470
471impl ops::Add<isize> for MultiBufferOffset {
472 type Output = Self;
473
474 fn add(self, rhs: isize) -> Self::Output {
475 MultiBufferOffset((self.0 as isize + rhs) as usize)
476 }
477}
478
479impl ops::Add for MultiBufferOffset {
480 type Output = Self;
481
482 fn add(self, rhs: MultiBufferOffset) -> Self::Output {
483 MultiBufferOffset(self.0 + rhs.0)
484 }
485}
486
487impl ops::AddAssign<MultiBufferOffset> for MultiBufferOffset {
488 fn add_assign(&mut self, other: MultiBufferOffset) {
489 self.0 += other.0;
490 }
491}
492
493pub trait ToOffset: 'static + fmt::Debug {
494 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset;
495 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16;
496}
497
498pub trait ToPoint: 'static + fmt::Debug {
499 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
500 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
501}
502
503struct BufferState {
504 buffer: Entity<Buffer>,
505 _subscriptions: [gpui::Subscription; 2],
506}
507
508struct DiffState {
509 diff: Entity<BufferDiff>,
510 main_buffer: Option<Entity<language::Buffer>>,
511 _subscription: gpui::Subscription,
512}
513
514impl DiffState {
515 fn snapshot(&self, buffer_id: BufferId, cx: &App) -> DiffStateSnapshot {
516 DiffStateSnapshot {
517 buffer_id,
518 diff: self.diff.read(cx).snapshot(cx),
519 main_buffer: self.main_buffer.as_ref().map(|b| b.read(cx).snapshot()),
520 }
521 }
522}
523
524#[derive(Clone)]
525struct DiffStateSnapshot {
526 buffer_id: BufferId,
527 diff: BufferDiffSnapshot,
528 main_buffer: Option<language::BufferSnapshot>,
529}
530
531impl std::ops::Deref for DiffStateSnapshot {
532 type Target = BufferDiffSnapshot;
533
534 fn deref(&self) -> &Self::Target {
535 &self.diff
536 }
537}
538
539#[derive(Clone, Debug, Default)]
540struct DiffStateSummary {
541 max_buffer_id: Option<BufferId>,
542 added_rows: u32,
543 removed_rows: u32,
544}
545
546impl sum_tree::ContextLessSummary for DiffStateSummary {
547 fn zero() -> Self {
548 Self::default()
549 }
550
551 fn add_summary(&mut self, other: &Self) {
552 self.max_buffer_id = std::cmp::max(self.max_buffer_id, other.max_buffer_id);
553 self.added_rows += other.added_rows;
554 self.removed_rows += other.removed_rows;
555 }
556}
557
558impl sum_tree::Item for DiffStateSnapshot {
559 type Summary = DiffStateSummary;
560
561 fn summary(&self, _cx: ()) -> DiffStateSummary {
562 let (added_rows, removed_rows) = self.diff.changed_row_counts();
563 DiffStateSummary {
564 max_buffer_id: Some(self.buffer_id),
565 added_rows,
566 removed_rows,
567 }
568 }
569}
570
571impl sum_tree::KeyedItem for DiffStateSnapshot {
572 type Key = Option<BufferId>;
573
574 fn key(&self) -> Option<BufferId> {
575 Some(self.buffer_id)
576 }
577}
578
579impl<'a> Dimension<'a, DiffStateSummary> for Option<BufferId> {
580 fn zero(_cx: ()) -> Self {
581 None
582 }
583
584 fn add_summary(&mut self, summary: &DiffStateSummary, _cx: ()) {
585 *self = std::cmp::max(*self, summary.max_buffer_id);
586 }
587}
588
589fn find_diff_state(
590 diffs: &SumTree<DiffStateSnapshot>,
591 buffer_id: BufferId,
592) -> Option<&DiffStateSnapshot> {
593 let key = Some(buffer_id);
594 let (.., item) = diffs.find::<Option<BufferId>, _>((), &key, Bias::Left);
595 item.filter(|entry| entry.buffer_id == buffer_id)
596}
597
598fn remove_diff_state(diffs: &mut SumTree<DiffStateSnapshot>, buffer_id: BufferId) {
599 let key = Some(buffer_id);
600 let mut cursor = diffs.cursor::<Option<BufferId>>(());
601 let mut new_tree = cursor.slice(&key, Bias::Left);
602 if key == cursor.end() {
603 cursor.next();
604 }
605 new_tree.append(cursor.suffix(), ());
606 drop(cursor);
607 *diffs = new_tree;
608}
609
610impl DiffState {
611 fn new(diff: Entity<BufferDiff>, cx: &mut Context<MultiBuffer>) -> Self {
612 DiffState {
613 _subscription: cx.subscribe(&diff, |this, diff, event, cx| match event {
614 BufferDiffEvent::DiffChanged(DiffChanged {
615 changed_range,
616 base_text_changed_range: _,
617 extended_range,
618 }) => {
619 let use_extended = this.snapshot.borrow().use_extended_diff_range;
620 let range = if use_extended {
621 extended_range.clone()
622 } else {
623 changed_range.clone()
624 };
625 if let Some(range) = range {
626 this.buffer_diff_changed(diff, range, cx)
627 }
628 cx.emit(Event::BufferDiffChanged);
629 }
630 BufferDiffEvent::LanguageChanged => this.buffer_diff_language_changed(diff, cx),
631 _ => {}
632 }),
633 diff,
634 main_buffer: None,
635 }
636 }
637
638 fn new_inverted(
639 diff: Entity<BufferDiff>,
640 main_buffer: Entity<language::Buffer>,
641 cx: &mut Context<MultiBuffer>,
642 ) -> Self {
643 let weak_main_buffer = main_buffer.downgrade();
644 DiffState {
645 _subscription: cx.subscribe(&diff, {
646 move |this, diff, event, cx| {
647 let Some(main_buffer) = weak_main_buffer.upgrade() else {
648 return;
649 };
650 match event {
651 BufferDiffEvent::DiffChanged(DiffChanged {
652 changed_range: _,
653 base_text_changed_range,
654 extended_range: _,
655 }) => {
656 this.inverted_buffer_diff_changed(
657 diff,
658 main_buffer,
659 base_text_changed_range.clone(),
660 cx,
661 );
662 cx.emit(Event::BufferDiffChanged);
663 }
664 BufferDiffEvent::LanguageChanged => {
665 this.inverted_buffer_diff_language_changed(diff, main_buffer, cx)
666 }
667 _ => {}
668 }
669 }
670 }),
671 diff,
672 main_buffer: Some(main_buffer),
673 }
674 }
675}
676
677#[derive(Clone)]
678struct BufferStateSnapshot {
679 path_key: PathKey,
680 path_key_index: PathKeyIndex,
681 buffer_snapshot: BufferSnapshot,
682}
683
684impl fmt::Debug for BufferStateSnapshot {
685 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
686 f.debug_struct("BufferStateSnapshot")
687 .field("path_key", &self.path_key)
688 .field("buffer_id", &self.buffer_snapshot.remote_id())
689 .finish()
690 }
691}
692
693/// The contents of a [`MultiBuffer`] at a single point in time.
694#[derive(Clone, Default)]
695pub struct MultiBufferSnapshot {
696 excerpts: SumTree<Excerpt>,
697 buffers: TreeMap<BufferId, BufferStateSnapshot>,
698 path_keys_by_index: TreeMap<PathKeyIndex, PathKey>,
699 indices_by_path_key: TreeMap<PathKey, PathKeyIndex>,
700 diffs: SumTree<DiffStateSnapshot>,
701 diff_transforms: SumTree<DiffTransform>,
702 non_text_state_update_count: usize,
703 edit_count: usize,
704 is_dirty: bool,
705 has_deleted_file: bool,
706 has_conflict: bool,
707 has_inverted_diff: bool,
708 singleton: bool,
709 trailing_excerpt_update_count: usize,
710 all_diff_hunks_expanded: bool,
711 show_deleted_hunks: bool,
712 use_extended_diff_range: bool,
713 show_headers: bool,
714}
715
716#[derive(Debug, Clone)]
717enum DiffTransform {
718 BufferContent {
719 summary: MBTextSummary,
720 inserted_hunk_info: Option<DiffTransformHunkInfo>,
721 },
722 DeletedHunk {
723 summary: TextSummary,
724 buffer_id: BufferId,
725 hunk_info: DiffTransformHunkInfo,
726 base_text_byte_range: Range<usize>,
727 has_trailing_newline: bool,
728 },
729}
730
731#[derive(Clone, Copy, Debug)]
732struct DiffTransformHunkInfo {
733 buffer_id: BufferId,
734 hunk_start_anchor: text::Anchor,
735 hunk_secondary_status: DiffHunkSecondaryStatus,
736 is_logically_deleted: bool,
737 excerpt_end: ExcerptAnchor,
738}
739
740impl Eq for DiffTransformHunkInfo {}
741
742impl PartialEq for DiffTransformHunkInfo {
743 fn eq(&self, other: &DiffTransformHunkInfo) -> bool {
744 self.buffer_id == other.buffer_id && self.hunk_start_anchor == other.hunk_start_anchor
745 }
746}
747
748impl std::hash::Hash for DiffTransformHunkInfo {
749 fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
750 self.buffer_id.hash(state);
751 self.hunk_start_anchor.hash(state);
752 }
753}
754
755#[derive(Clone)]
756pub struct ExcerptBoundaryInfo {
757 pub start_anchor: Anchor,
758 pub range: ExcerptRange<text::Anchor>,
759 pub end_row: MultiBufferRow,
760}
761
762impl ExcerptBoundaryInfo {
763 pub fn start_text_anchor(&self) -> text::Anchor {
764 self.range.context.start
765 }
766 pub fn buffer_id(&self) -> BufferId {
767 self.start_text_anchor().buffer_id
768 }
769 pub fn buffer<'a>(&self, snapshot: &'a MultiBufferSnapshot) -> &'a BufferSnapshot {
770 snapshot
771 .buffer_for_id(self.buffer_id())
772 .expect("buffer snapshot not found for excerpt boundary")
773 }
774}
775
776impl std::fmt::Debug for ExcerptBoundaryInfo {
777 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
778 f.debug_struct(type_name::<Self>())
779 .field("buffer_id", &self.buffer_id())
780 .field("range", &self.range)
781 .finish()
782 }
783}
784
785impl PartialEq for ExcerptBoundaryInfo {
786 fn eq(&self, other: &Self) -> bool {
787 self.start_anchor == other.start_anchor && self.range == other.range
788 }
789}
790
791impl Eq for ExcerptBoundaryInfo {}
792
793/// A boundary between `Excerpt`s in a [`MultiBuffer`]
794#[derive(Debug)]
795pub struct ExcerptBoundary {
796 pub prev: Option<ExcerptBoundaryInfo>,
797 pub next: ExcerptBoundaryInfo,
798 /// The row in the `MultiBuffer` where the boundary is located
799 pub row: MultiBufferRow,
800}
801
802impl ExcerptBoundary {
803 pub fn starts_new_buffer(&self) -> bool {
804 match (self.prev.as_ref(), &self.next) {
805 (None, _) => true,
806 (Some(prev), next) => prev.buffer_id() != next.buffer_id(),
807 }
808 }
809}
810
811#[derive(Copy, Clone, Debug, PartialEq, Eq)]
812pub struct ExpandInfo {
813 pub direction: ExpandExcerptDirection,
814 pub start_anchor: Anchor,
815}
816
817#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
818pub struct RowInfo {
819 pub buffer_id: Option<BufferId>,
820 pub buffer_row: Option<u32>,
821 pub multibuffer_row: Option<MultiBufferRow>,
822 pub diff_status: Option<buffer_diff::DiffHunkStatus>,
823 pub expand_info: Option<ExpandInfo>,
824 pub wrapped_buffer_row: Option<u32>,
825}
826
827/// A slice into a [`Buffer`] that is being edited in a [`MultiBuffer`].
828#[derive(Clone, Debug)]
829pub(crate) struct Excerpt {
830 /// The location of the excerpt in the [`MultiBuffer`]
831 pub(crate) path_key: PathKey,
832 pub(crate) path_key_index: PathKeyIndex,
833 pub(crate) buffer_id: BufferId,
834 /// The range of the buffer to be shown in the excerpt
835 pub(crate) range: ExcerptRange<text::Anchor>,
836
837 /// The last row in the excerpted slice of the buffer
838 pub(crate) max_buffer_row: BufferRow,
839 /// A summary of the text in the excerpt
840 pub(crate) text_summary: TextSummary,
841 pub(crate) has_trailing_newline: bool,
842}
843
844/// A range of text from a single [`Buffer`], to be shown as an `Excerpt`.
845/// These ranges are relative to the buffer itself
846#[derive(Clone, Debug, Eq, PartialEq, Hash)]
847pub struct ExcerptRange<T> {
848 /// The full range of text to be shown in the excerpt.
849 pub context: Range<T>,
850 /// The primary range of text to be highlighted in the excerpt.
851 /// In a multi-buffer search, this would be the text that matched the search
852 pub primary: Range<T>,
853}
854
855impl<T: Clone> ExcerptRange<T> {
856 pub fn new(context: Range<T>) -> Self {
857 Self {
858 context: context.clone(),
859 primary: context,
860 }
861 }
862}
863
864impl ExcerptRange<text::Anchor> {
865 pub fn contains(&self, t: &text::Anchor, snapshot: &BufferSnapshot) -> bool {
866 self.context.start.cmp(t, snapshot).is_le() && self.context.end.cmp(t, snapshot).is_ge()
867 }
868}
869
870#[derive(Clone, Debug)]
871pub struct ExcerptSummary {
872 path_key: PathKey,
873 path_key_index: Option<PathKeyIndex>,
874 max_anchor: Option<text::Anchor>,
875 widest_line_number: u32,
876 text: MBTextSummary,
877 count: usize,
878}
879
880impl ExcerptSummary {
881 pub fn min() -> Self {
882 ExcerptSummary {
883 path_key: PathKey::min(),
884 path_key_index: None,
885 max_anchor: None,
886 widest_line_number: 0,
887 text: MBTextSummary::default(),
888 count: 0,
889 }
890 }
891
892 fn len(&self) -> ExcerptOffset {
893 ExcerptDimension(self.text.len)
894 }
895}
896
897#[derive(Debug, Clone)]
898pub struct DiffTransformSummary {
899 input: MBTextSummary,
900 output: MBTextSummary,
901}
902
903/// Summary of a string of text.
904#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
905pub struct MBTextSummary {
906 /// Length in bytes.
907 pub len: MultiBufferOffset,
908 /// Length in UTF-8.
909 pub chars: usize,
910 /// Length in UTF-16 code units
911 pub len_utf16: OffsetUtf16,
912 /// A point representing the number of lines and the length of the last line.
913 ///
914 /// In other words, it marks the point after the last byte in the text, (if
915 /// EOF was a character, this would be its position).
916 pub lines: Point,
917 /// How many `char`s are in the first line
918 pub first_line_chars: u32,
919 /// How many `char`s are in the last line
920 pub last_line_chars: u32,
921 /// How many UTF-16 code units are in the last line
922 pub last_line_len_utf16: u32,
923 /// The row idx of the longest row
924 pub longest_row: u32,
925 /// How many `char`s are in the longest row
926 pub longest_row_chars: u32,
927}
928
929impl From<TextSummary> for MBTextSummary {
930 fn from(summary: TextSummary) -> Self {
931 MBTextSummary {
932 len: MultiBufferOffset(summary.len),
933 chars: summary.chars,
934 len_utf16: summary.len_utf16,
935 lines: summary.lines,
936 first_line_chars: summary.first_line_chars,
937 last_line_chars: summary.last_line_chars,
938 last_line_len_utf16: summary.last_line_len_utf16,
939 longest_row: summary.longest_row,
940 longest_row_chars: summary.longest_row_chars,
941 }
942 }
943}
944
945impl From<MBTextSummary> for TextSummary {
946 fn from(summary: MBTextSummary) -> Self {
947 TextSummary {
948 len: summary.len.0,
949 chars: summary.chars,
950 len_utf16: summary.len_utf16,
951 lines: summary.lines,
952 first_line_chars: summary.first_line_chars,
953 last_line_chars: summary.last_line_chars,
954 last_line_len_utf16: summary.last_line_len_utf16,
955 longest_row: summary.longest_row,
956 longest_row_chars: summary.longest_row_chars,
957 }
958 }
959}
960
961impl From<&str> for MBTextSummary {
962 fn from(text: &str) -> Self {
963 MBTextSummary::from(TextSummary::from(text))
964 }
965}
966
967impl MultiBufferDimension for MBTextSummary {
968 type TextDimension = TextSummary;
969
970 fn from_summary(summary: &MBTextSummary) -> Self {
971 *summary
972 }
973
974 fn add_text_dim(&mut self, summary: &Self::TextDimension) {
975 *self += *summary;
976 }
977
978 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
979 *self += *summary;
980 }
981}
982
983impl AddAssign for MBTextSummary {
984 fn add_assign(&mut self, other: MBTextSummary) {
985 let joined_chars = self.last_line_chars + other.first_line_chars;
986 if joined_chars > self.longest_row_chars {
987 self.longest_row = self.lines.row;
988 self.longest_row_chars = joined_chars;
989 }
990 if other.longest_row_chars > self.longest_row_chars {
991 self.longest_row = self.lines.row + other.longest_row;
992 self.longest_row_chars = other.longest_row_chars;
993 }
994
995 if self.lines.row == 0 {
996 self.first_line_chars += other.first_line_chars;
997 }
998
999 if other.lines.row == 0 {
1000 self.last_line_chars += other.first_line_chars;
1001 self.last_line_len_utf16 += other.last_line_len_utf16;
1002 } else {
1003 self.last_line_chars = other.last_line_chars;
1004 self.last_line_len_utf16 = other.last_line_len_utf16;
1005 }
1006
1007 self.chars += other.chars;
1008 self.len += other.len;
1009 self.len_utf16 += other.len_utf16;
1010 self.lines += other.lines;
1011 }
1012}
1013
1014impl AddAssign<TextSummary> for MBTextSummary {
1015 fn add_assign(&mut self, other: TextSummary) {
1016 *self += MBTextSummary::from(other);
1017 }
1018}
1019
1020impl MBTextSummary {
1021 pub fn lines_utf16(&self) -> PointUtf16 {
1022 PointUtf16 {
1023 row: self.lines.row,
1024 column: self.last_line_len_utf16,
1025 }
1026 }
1027}
1028
1029impl<K, V> MultiBufferDimension for DimensionPair<K, V>
1030where
1031 K: MultiBufferDimension,
1032 V: MultiBufferDimension,
1033{
1034 type TextDimension = DimensionPair<K::TextDimension, V::TextDimension>;
1035
1036 fn from_summary(summary: &MBTextSummary) -> Self {
1037 Self {
1038 key: K::from_summary(summary),
1039 value: Some(V::from_summary(summary)),
1040 }
1041 }
1042
1043 fn add_text_dim(&mut self, summary: &Self::TextDimension) {
1044 self.key.add_text_dim(&summary.key);
1045 if let Some(value) = &mut self.value {
1046 if let Some(other_value) = summary.value.as_ref() {
1047 value.add_text_dim(other_value);
1048 }
1049 }
1050 }
1051
1052 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
1053 self.key.add_mb_text_summary(summary);
1054 if let Some(value) = &mut self.value {
1055 value.add_mb_text_summary(summary);
1056 }
1057 }
1058}
1059
1060#[derive(Clone)]
1061pub struct MultiBufferRows<'a> {
1062 point: Point,
1063 is_empty: bool,
1064 is_singleton: bool,
1065 cursor: MultiBufferCursor<'a, Point, Point>,
1066}
1067
1068pub struct MultiBufferChunks<'a> {
1069 excerpts: Cursor<'a, 'static, Excerpt, ExcerptOffset>,
1070 diff_transforms:
1071 Cursor<'a, 'static, DiffTransform, Dimensions<MultiBufferOffset, ExcerptOffset>>,
1072 diff_base_chunks: Option<(BufferId, BufferChunks<'a>)>,
1073 buffer_chunk: Option<Chunk<'a>>,
1074 range: Range<MultiBufferOffset>,
1075 excerpt_offset_range: Range<ExcerptOffset>,
1076 excerpt_chunks: Option<ExcerptChunks<'a>>,
1077 language_aware: LanguageAwareStyling,
1078 snapshot: &'a MultiBufferSnapshot,
1079}
1080
1081pub struct ReversedMultiBufferChunks<'a> {
1082 cursor: MultiBufferCursor<'a, MultiBufferOffset, BufferOffset>,
1083 current_chunks: Option<rope::Chunks<'a>>,
1084 start: MultiBufferOffset,
1085 offset: MultiBufferOffset,
1086}
1087
1088pub struct MultiBufferBytes<'a> {
1089 range: Range<MultiBufferOffset>,
1090 cursor: MultiBufferCursor<'a, MultiBufferOffset, BufferOffset>,
1091 excerpt_bytes: Option<text::Bytes<'a>>,
1092 has_trailing_newline: bool,
1093 chunk: &'a [u8],
1094}
1095
1096pub struct ReversedMultiBufferBytes<'a> {
1097 range: Range<MultiBufferOffset>,
1098 chunks: ReversedMultiBufferChunks<'a>,
1099 chunk: &'a [u8],
1100}
1101
1102#[derive(Clone)]
1103struct DiffTransforms<MBD> {
1104 output_dimension: OutputDimension<MBD>,
1105 excerpt_dimension: ExcerptDimension<MBD>,
1106}
1107
1108impl<'a, MBD: MultiBufferDimension> Dimension<'a, DiffTransformSummary> for DiffTransforms<MBD> {
1109 fn zero(cx: <DiffTransformSummary as sum_tree::Summary>::Context<'_>) -> Self {
1110 Self {
1111 output_dimension: OutputDimension::zero(cx),
1112 excerpt_dimension: <ExcerptDimension<MBD> as Dimension<'a, DiffTransformSummary>>::zero(
1113 cx,
1114 ),
1115 }
1116 }
1117
1118 fn add_summary(
1119 &mut self,
1120 summary: &'a DiffTransformSummary,
1121 cx: <DiffTransformSummary as sum_tree::Summary>::Context<'_>,
1122 ) {
1123 self.output_dimension.add_summary(summary, cx);
1124 self.excerpt_dimension.add_summary(summary, cx);
1125 }
1126}
1127
1128#[derive(Clone)]
1129struct MultiBufferCursor<'a, MBD, BD> {
1130 excerpts: Cursor<'a, 'static, Excerpt, ExcerptDimension<MBD>>,
1131 diff_transforms: Cursor<'a, 'static, DiffTransform, DiffTransforms<MBD>>,
1132 cached_region: OnceCell<Option<MultiBufferRegion<'a, MBD, BD>>>,
1133 snapshot: &'a MultiBufferSnapshot,
1134}
1135
1136#[derive(Clone)]
1137struct MultiBufferRegion<'a, MBD, BD> {
1138 buffer: &'a BufferSnapshot,
1139 is_main_buffer: bool,
1140 diff_hunk_status: Option<DiffHunkStatus>,
1141 excerpt: &'a Excerpt,
1142 buffer_range: Range<BD>,
1143 range: Range<MBD>,
1144 has_trailing_newline: bool,
1145}
1146
1147struct ExcerptChunks<'a> {
1148 content_chunks: BufferChunks<'a>,
1149 end: ExcerptAnchor,
1150 has_footer: bool,
1151}
1152
1153#[derive(Debug)]
1154struct BufferEdit {
1155 range: Range<BufferOffset>,
1156 new_text: Arc<str>,
1157 is_insertion: bool,
1158 original_indent_column: Option<u32>,
1159}
1160
1161#[derive(Clone, Copy, Debug, PartialEq)]
1162enum DiffChangeKind {
1163 BufferEdited,
1164 DiffUpdated { base_changed: bool },
1165 ExpandOrCollapseHunks { expand: bool },
1166}
1167
1168#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
1169pub enum ExpandExcerptDirection {
1170 Up,
1171 Down,
1172 UpAndDown,
1173}
1174
1175impl ExpandExcerptDirection {
1176 pub fn should_expand_up(&self) -> bool {
1177 match self {
1178 ExpandExcerptDirection::Up => true,
1179 ExpandExcerptDirection::Down => false,
1180 ExpandExcerptDirection::UpAndDown => true,
1181 }
1182 }
1183
1184 pub fn should_expand_down(&self) -> bool {
1185 match self {
1186 ExpandExcerptDirection::Up => false,
1187 ExpandExcerptDirection::Down => true,
1188 ExpandExcerptDirection::UpAndDown => true,
1189 }
1190 }
1191}
1192
1193#[derive(Clone, Debug, PartialEq)]
1194pub struct IndentGuide {
1195 pub buffer_id: BufferId,
1196 pub start_row: MultiBufferRow,
1197 pub end_row: MultiBufferRow,
1198 pub depth: u32,
1199 pub tab_size: u32,
1200 pub settings: IndentGuideSettings,
1201}
1202
1203impl IndentGuide {
1204 pub fn indent_level(&self) -> u32 {
1205 self.depth * self.tab_size
1206 }
1207}
1208
1209impl MultiBuffer {
1210 pub fn new(capability: Capability) -> Self {
1211 Self::new_(
1212 capability,
1213 MultiBufferSnapshot {
1214 show_headers: true,
1215 show_deleted_hunks: true,
1216 ..MultiBufferSnapshot::default()
1217 },
1218 )
1219 }
1220
1221 pub fn without_headers(capability: Capability) -> Self {
1222 Self::new_(
1223 capability,
1224 MultiBufferSnapshot {
1225 show_deleted_hunks: true,
1226 ..MultiBufferSnapshot::default()
1227 },
1228 )
1229 }
1230
1231 pub fn singleton(buffer: Entity<Buffer>, cx: &mut Context<Self>) -> Self {
1232 let mut this = Self::new_(
1233 buffer.read(cx).capability(),
1234 MultiBufferSnapshot {
1235 singleton: true,
1236 show_deleted_hunks: true,
1237 ..MultiBufferSnapshot::default()
1238 },
1239 );
1240 this.singleton = true;
1241 this.set_excerpts_for_path(
1242 PathKey::sorted(0),
1243 buffer.clone(),
1244 [Point::zero()..buffer.read(cx).max_point()],
1245 0,
1246 cx,
1247 );
1248 this
1249 }
1250
1251 #[inline]
1252 pub fn new_(capability: Capability, snapshot: MultiBufferSnapshot) -> Self {
1253 Self {
1254 snapshot: RefCell::new(snapshot),
1255 buffers: Default::default(),
1256 diffs: HashMap::default(),
1257 subscriptions: Topic::default(),
1258 singleton: false,
1259 capability,
1260 title: None,
1261 buffer_changed_since_sync: Default::default(),
1262 history: History::default(),
1263 }
1264 }
1265
1266 pub fn clone(&self, new_cx: &mut Context<Self>) -> Self {
1267 let mut buffers = BTreeMap::default();
1268 let buffer_changed_since_sync = Rc::new(Cell::new(false));
1269 for (buffer_id, buffer_state) in self.buffers.iter() {
1270 buffer_state.buffer.update(new_cx, |buffer, _| {
1271 buffer.record_changes(Rc::downgrade(&buffer_changed_since_sync));
1272 });
1273 buffers.insert(
1274 *buffer_id,
1275 BufferState {
1276 buffer: buffer_state.buffer.clone(),
1277 _subscriptions: [
1278 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
1279 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
1280 ],
1281 },
1282 );
1283 }
1284 let mut diff_bases = HashMap::default();
1285 for (buffer_id, diff) in self.diffs.iter() {
1286 diff_bases.insert(*buffer_id, DiffState::new(diff.diff.clone(), new_cx));
1287 }
1288 Self {
1289 snapshot: RefCell::new(self.snapshot.borrow().clone()),
1290 buffers,
1291 diffs: diff_bases,
1292 subscriptions: Default::default(),
1293 singleton: self.singleton,
1294 capability: self.capability,
1295 history: self.history.clone(),
1296 title: self.title.clone(),
1297 buffer_changed_since_sync,
1298 }
1299 }
1300
1301 pub fn set_group_interval(&mut self, group_interval: Duration, cx: &mut Context<Self>) {
1302 self.history.set_group_interval(group_interval);
1303 if self.singleton {
1304 for BufferState { buffer, .. } in self.buffers.values() {
1305 buffer.update(cx, |buffer, _| {
1306 buffer.set_group_interval(group_interval);
1307 });
1308 }
1309 }
1310 }
1311
1312 pub fn with_title(mut self, title: String) -> Self {
1313 self.title = Some(title);
1314 self
1315 }
1316
1317 pub fn read_only(&self) -> bool {
1318 !self.capability.editable()
1319 }
1320
1321 pub fn capability(&self) -> Capability {
1322 self.capability
1323 }
1324
1325 /// Returns an up-to-date snapshot of the MultiBuffer.
1326 #[ztracing::instrument(skip_all)]
1327 pub fn snapshot(&self, cx: &App) -> MultiBufferSnapshot {
1328 self.sync(cx);
1329 self.snapshot.borrow().clone()
1330 }
1331
1332 pub fn read(&self, cx: &App) -> Ref<'_, MultiBufferSnapshot> {
1333 self.sync(cx);
1334 self.snapshot.borrow()
1335 }
1336
1337 pub fn as_singleton(&self) -> Option<Entity<Buffer>> {
1338 if self.singleton {
1339 Some(self.buffers.values().next().unwrap().buffer.clone())
1340 } else {
1341 None
1342 }
1343 }
1344
1345 pub fn is_singleton(&self) -> bool {
1346 self.singleton
1347 }
1348
1349 pub fn subscribe(&mut self) -> Subscription<MultiBufferOffset> {
1350 self.subscriptions.subscribe()
1351 }
1352
1353 pub fn is_dirty(&self, cx: &App) -> bool {
1354 self.read(cx).is_dirty()
1355 }
1356
1357 pub fn has_deleted_file(&self, cx: &App) -> bool {
1358 self.read(cx).has_deleted_file()
1359 }
1360
1361 pub fn has_conflict(&self, cx: &App) -> bool {
1362 self.read(cx).has_conflict()
1363 }
1364
1365 // The `is_empty` signature doesn't match what clippy expects
1366 #[allow(clippy::len_without_is_empty)]
1367 pub fn len(&self, cx: &App) -> MultiBufferOffset {
1368 self.read(cx).len()
1369 }
1370
1371 pub fn is_empty(&self) -> bool {
1372 self.buffers.is_empty()
1373 }
1374
1375 pub fn edit<I, S, T>(
1376 &mut self,
1377 edits: I,
1378 autoindent_mode: Option<AutoindentMode>,
1379 cx: &mut Context<Self>,
1380 ) where
1381 I: IntoIterator<Item = (Range<S>, T)>,
1382 S: ToOffset,
1383 T: Into<Arc<str>>,
1384 {
1385 self.edit_internal(edits, autoindent_mode, true, cx);
1386 }
1387
1388 pub fn edit_non_coalesce<I, S, T>(
1389 &mut self,
1390 edits: I,
1391 autoindent_mode: Option<AutoindentMode>,
1392 cx: &mut Context<Self>,
1393 ) where
1394 I: IntoIterator<Item = (Range<S>, T)>,
1395 S: ToOffset,
1396 T: Into<Arc<str>>,
1397 {
1398 self.edit_internal(edits, autoindent_mode, false, cx);
1399 }
1400
1401 fn edit_internal<I, S, T>(
1402 &mut self,
1403 edits: I,
1404 autoindent_mode: Option<AutoindentMode>,
1405 coalesce_adjacent: bool,
1406 cx: &mut Context<Self>,
1407 ) where
1408 I: IntoIterator<Item = (Range<S>, T)>,
1409 S: ToOffset,
1410 T: Into<Arc<str>>,
1411 {
1412 if self.read_only() || self.buffers.is_empty() {
1413 return;
1414 }
1415 self.sync_mut(cx);
1416 let edits = edits
1417 .into_iter()
1418 .map(|(range, new_text)| {
1419 let mut range = range.start.to_offset(self.snapshot.get_mut())
1420 ..range.end.to_offset(self.snapshot.get_mut());
1421 if range.start > range.end {
1422 mem::swap(&mut range.start, &mut range.end);
1423 }
1424 (range, new_text.into())
1425 })
1426 .collect::<Vec<_>>();
1427
1428 return edit_internal(self, edits, autoindent_mode, coalesce_adjacent, cx);
1429
1430 // Non-generic part of edit, hoisted out to avoid blowing up LLVM IR.
1431 fn edit_internal(
1432 this: &mut MultiBuffer,
1433 edits: Vec<(Range<MultiBufferOffset>, Arc<str>)>,
1434 mut autoindent_mode: Option<AutoindentMode>,
1435 coalesce_adjacent: bool,
1436 cx: &mut Context<MultiBuffer>,
1437 ) {
1438 let original_indent_columns = match &mut autoindent_mode {
1439 Some(AutoindentMode::Block {
1440 original_indent_columns,
1441 }) => mem::take(original_indent_columns),
1442 _ => Default::default(),
1443 };
1444
1445 let buffer_edits = MultiBuffer::convert_edits_to_buffer_edits(
1446 edits,
1447 this.snapshot.get_mut(),
1448 &original_indent_columns,
1449 );
1450
1451 let mut buffer_ids = Vec::with_capacity(buffer_edits.len());
1452 for (buffer_id, mut edits) in buffer_edits {
1453 buffer_ids.push(buffer_id);
1454 edits.sort_by_key(|edit| edit.range.start);
1455 this.buffers[&buffer_id].buffer.update(cx, |buffer, cx| {
1456 let mut edits = edits.into_iter().peekable();
1457 let mut insertions = Vec::new();
1458 let mut original_indent_columns = Vec::new();
1459 let mut deletions = Vec::new();
1460 let empty_str: Arc<str> = Arc::default();
1461 while let Some(BufferEdit {
1462 mut range,
1463 mut new_text,
1464 mut is_insertion,
1465 original_indent_column,
1466 }) = edits.next()
1467 {
1468 while let Some(BufferEdit {
1469 range: next_range,
1470 is_insertion: next_is_insertion,
1471 new_text: next_new_text,
1472 ..
1473 }) = edits.peek()
1474 {
1475 let should_coalesce = if coalesce_adjacent {
1476 range.end >= next_range.start
1477 } else {
1478 range.end > next_range.start
1479 };
1480
1481 if should_coalesce {
1482 range.end = cmp::max(next_range.end, range.end);
1483 is_insertion |= *next_is_insertion;
1484 new_text = format!("{new_text}{next_new_text}").into();
1485 edits.next();
1486 } else {
1487 break;
1488 }
1489 }
1490
1491 if is_insertion {
1492 original_indent_columns.push(original_indent_column);
1493 insertions.push((
1494 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
1495 new_text.clone(),
1496 ));
1497 } else if !range.is_empty() {
1498 deletions.push((
1499 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
1500 empty_str.clone(),
1501 ));
1502 }
1503 }
1504
1505 let deletion_autoindent_mode =
1506 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
1507 Some(AutoindentMode::Block {
1508 original_indent_columns: Default::default(),
1509 })
1510 } else {
1511 autoindent_mode.clone()
1512 };
1513 let insertion_autoindent_mode =
1514 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
1515 Some(AutoindentMode::Block {
1516 original_indent_columns,
1517 })
1518 } else {
1519 autoindent_mode.clone()
1520 };
1521
1522 if coalesce_adjacent {
1523 buffer.edit(deletions, deletion_autoindent_mode, cx);
1524 buffer.edit(insertions, insertion_autoindent_mode, cx);
1525 } else {
1526 buffer.edit_non_coalesce(deletions, deletion_autoindent_mode, cx);
1527 buffer.edit_non_coalesce(insertions, insertion_autoindent_mode, cx);
1528 }
1529 })
1530 }
1531
1532 cx.emit(Event::BuffersEdited { buffer_ids });
1533 }
1534 }
1535
1536 fn convert_edits_to_buffer_edits(
1537 edits: Vec<(Range<MultiBufferOffset>, Arc<str>)>,
1538 snapshot: &MultiBufferSnapshot,
1539 original_indent_columns: &[Option<u32>],
1540 ) -> HashMap<BufferId, Vec<BufferEdit>> {
1541 let mut buffer_edits: HashMap<BufferId, Vec<BufferEdit>> = Default::default();
1542 let mut cursor = snapshot.cursor::<MultiBufferOffset, BufferOffset>();
1543 for (ix, (range, new_text)) in edits.into_iter().enumerate() {
1544 let original_indent_column = original_indent_columns.get(ix).copied().flatten();
1545
1546 cursor.seek(&range.start);
1547 let mut start_region = cursor.region().expect("start offset out of bounds");
1548 if !start_region.is_main_buffer {
1549 cursor.next();
1550 if let Some(region) = cursor.region() {
1551 start_region = region;
1552 } else {
1553 continue;
1554 }
1555 }
1556
1557 if range.end < start_region.range.start {
1558 continue;
1559 }
1560
1561 let start_region = start_region.clone();
1562 if range.end > start_region.range.end {
1563 cursor.seek_forward(&range.end);
1564 }
1565 let mut end_region = cursor.region().expect("end offset out of bounds");
1566 if !end_region.is_main_buffer {
1567 cursor.prev();
1568 if let Some(region) = cursor.region() {
1569 end_region = region;
1570 } else {
1571 continue;
1572 }
1573 }
1574
1575 if range.start > end_region.range.end {
1576 continue;
1577 }
1578
1579 let start_overshoot = range.start.saturating_sub(start_region.range.start);
1580 let end_overshoot = range.end.saturating_sub(end_region.range.start);
1581 let buffer_start = (start_region.buffer_range.start + start_overshoot)
1582 .min(start_region.buffer_range.end);
1583 let buffer_end =
1584 (end_region.buffer_range.start + end_overshoot).min(end_region.buffer_range.end);
1585
1586 if start_region.excerpt == end_region.excerpt {
1587 if start_region.buffer.capability == Capability::ReadWrite
1588 && start_region.is_main_buffer
1589 {
1590 buffer_edits
1591 .entry(start_region.buffer.remote_id())
1592 .or_default()
1593 .push(BufferEdit {
1594 range: buffer_start..buffer_end,
1595 new_text,
1596 is_insertion: true,
1597 original_indent_column,
1598 });
1599 }
1600 } else {
1601 let start_excerpt_range = buffer_start..start_region.buffer_range.end;
1602 let end_excerpt_range = end_region.buffer_range.start..buffer_end;
1603 if start_region.buffer.capability == Capability::ReadWrite
1604 && start_region.is_main_buffer
1605 {
1606 buffer_edits
1607 .entry(start_region.buffer.remote_id())
1608 .or_default()
1609 .push(BufferEdit {
1610 range: start_excerpt_range,
1611 new_text: new_text.clone(),
1612 is_insertion: true,
1613 original_indent_column,
1614 });
1615 }
1616 if end_region.buffer.capability == Capability::ReadWrite
1617 && end_region.is_main_buffer
1618 {
1619 buffer_edits
1620 .entry(end_region.buffer.remote_id())
1621 .or_default()
1622 .push(BufferEdit {
1623 range: end_excerpt_range,
1624 new_text: new_text.clone(),
1625 is_insertion: false,
1626 original_indent_column,
1627 });
1628 }
1629 let end_region_excerpt = end_region.excerpt.clone();
1630
1631 cursor.seek(&range.start);
1632 cursor.next_excerpt();
1633 while let Some(region) = cursor.region() {
1634 if region.excerpt == &end_region_excerpt {
1635 break;
1636 }
1637 if region.buffer.capability == Capability::ReadWrite && region.is_main_buffer {
1638 buffer_edits
1639 .entry(region.buffer.remote_id())
1640 .or_default()
1641 .push(BufferEdit {
1642 range: region.buffer_range.clone(),
1643 new_text: new_text.clone(),
1644 is_insertion: false,
1645 original_indent_column,
1646 });
1647 }
1648 cursor.next_excerpt();
1649 }
1650 }
1651 }
1652 buffer_edits
1653 }
1654
1655 pub fn autoindent_ranges<I, S>(&mut self, ranges: I, cx: &mut Context<Self>)
1656 where
1657 I: IntoIterator<Item = Range<S>>,
1658 S: ToOffset,
1659 {
1660 if self.read_only() || self.buffers.is_empty() {
1661 return;
1662 }
1663 self.sync_mut(cx);
1664 let empty = Arc::<str>::from("");
1665 let edits = ranges
1666 .into_iter()
1667 .map(|range| {
1668 let mut range = range.start.to_offset(self.snapshot.get_mut())
1669 ..range.end.to_offset(&self.snapshot.get_mut());
1670 if range.start > range.end {
1671 mem::swap(&mut range.start, &mut range.end);
1672 }
1673 (range, empty.clone())
1674 })
1675 .collect::<Vec<_>>();
1676
1677 return autoindent_ranges_internal(self, edits, cx);
1678
1679 fn autoindent_ranges_internal(
1680 this: &mut MultiBuffer,
1681 edits: Vec<(Range<MultiBufferOffset>, Arc<str>)>,
1682 cx: &mut Context<MultiBuffer>,
1683 ) {
1684 let buffer_edits =
1685 MultiBuffer::convert_edits_to_buffer_edits(edits, this.snapshot.get_mut(), &[]);
1686
1687 let mut buffer_ids = Vec::new();
1688 for (buffer_id, mut edits) in buffer_edits {
1689 buffer_ids.push(buffer_id);
1690 edits.sort_unstable_by_key(|edit| edit.range.start);
1691
1692 let mut ranges: Vec<Range<BufferOffset>> = Vec::new();
1693 for edit in edits {
1694 if let Some(last_range) = ranges.last_mut()
1695 && edit.range.start <= last_range.end
1696 {
1697 last_range.end = last_range.end.max(edit.range.end);
1698 continue;
1699 }
1700 ranges.push(edit.range);
1701 }
1702
1703 this.buffers[&buffer_id].buffer.update(cx, |buffer, cx| {
1704 buffer.autoindent_ranges(ranges, cx);
1705 })
1706 }
1707
1708 cx.emit(Event::BuffersEdited { buffer_ids });
1709 }
1710 }
1711
1712 pub fn set_active_selections(
1713 &self,
1714 selections: &[Selection<Anchor>],
1715 line_mode: bool,
1716 cursor_shape: CursorShape,
1717 cx: &mut Context<Self>,
1718 ) {
1719 let snapshot = self.snapshot(cx);
1720 let mut selections_by_buffer: HashMap<BufferId, Vec<Selection<text::Anchor>>> =
1721 Default::default();
1722
1723 for selection in selections {
1724 for (buffer_snapshot, buffer_range, _) in
1725 snapshot.range_to_buffer_ranges(selection.start..selection.end)
1726 {
1727 selections_by_buffer
1728 .entry(buffer_snapshot.remote_id())
1729 .or_default()
1730 .push(Selection {
1731 id: selection.id,
1732 start: buffer_snapshot
1733 .anchor_at(buffer_range.start, selection.start.bias()),
1734 end: buffer_snapshot.anchor_at(buffer_range.end, selection.end.bias()),
1735 reversed: selection.reversed,
1736 goal: selection.goal,
1737 });
1738 }
1739 }
1740
1741 for (buffer_id, buffer_state) in self.buffers.iter() {
1742 if !selections_by_buffer.contains_key(buffer_id) {
1743 buffer_state
1744 .buffer
1745 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1746 }
1747 }
1748
1749 for (buffer_id, selections) in selections_by_buffer {
1750 self.buffers[&buffer_id].buffer.update(cx, |buffer, cx| {
1751 buffer.set_active_selections(selections.into(), line_mode, cursor_shape, cx);
1752 });
1753 }
1754 }
1755
1756 pub fn remove_active_selections(&self, cx: &mut Context<Self>) {
1757 for buffer in self.buffers.values() {
1758 buffer
1759 .buffer
1760 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1761 }
1762 }
1763
1764 #[instrument(skip_all)]
1765 fn merge_excerpt_ranges<'a>(
1766 expanded_ranges: impl IntoIterator<Item = &'a ExcerptRange<Point>> + 'a,
1767 ) -> Vec<ExcerptRange<Point>> {
1768 let mut sorted: Vec<_> = expanded_ranges.into_iter().collect();
1769 sorted.sort_by_key(|range| range.context.start);
1770 let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();
1771 for range in sorted {
1772 if let Some(last_range) = merged_ranges.last_mut() {
1773 if last_range.context.end >= range.context.start
1774 || last_range.context.end.row + 1 == range.context.start.row
1775 {
1776 last_range.context.end = range.context.end.max(last_range.context.end);
1777 continue;
1778 }
1779 }
1780 merged_ranges.push(range.clone());
1781 }
1782 merged_ranges
1783 }
1784
1785 pub fn clear(&mut self, cx: &mut Context<Self>) {
1786 self.sync_mut(cx);
1787 let removed_buffer_ids = std::mem::take(&mut self.buffers).into_keys().collect();
1788 self.diffs.clear();
1789 let MultiBufferSnapshot {
1790 excerpts,
1791 diffs,
1792 diff_transforms: _,
1793 non_text_state_update_count: _,
1794 edit_count: _,
1795 is_dirty,
1796 has_deleted_file,
1797 has_conflict,
1798 has_inverted_diff,
1799 singleton: _,
1800 trailing_excerpt_update_count,
1801 all_diff_hunks_expanded: _,
1802 show_deleted_hunks: _,
1803 use_extended_diff_range: _,
1804 show_headers: _,
1805 path_keys_by_index: _,
1806 indices_by_path_key: _,
1807 buffers,
1808 } = self.snapshot.get_mut();
1809 let start = ExcerptDimension(MultiBufferOffset::ZERO);
1810 let prev_len = ExcerptDimension(excerpts.summary().text.len);
1811 *excerpts = Default::default();
1812 *buffers = Default::default();
1813 *diffs = Default::default();
1814 *trailing_excerpt_update_count += 1;
1815 *is_dirty = false;
1816 *has_deleted_file = false;
1817 *has_conflict = false;
1818 *has_inverted_diff = false;
1819
1820 let edits = Self::sync_diff_transforms(
1821 self.snapshot.get_mut(),
1822 vec![Edit {
1823 old: start..prev_len,
1824 new: start..start,
1825 }],
1826 DiffChangeKind::BufferEdited,
1827 );
1828 if !edits.is_empty() {
1829 self.subscriptions.publish(edits);
1830 }
1831 cx.emit(Event::Edited {
1832 edited_buffer: None,
1833 is_local: true,
1834 });
1835 cx.emit(Event::BuffersRemoved { removed_buffer_ids });
1836 cx.notify();
1837 }
1838
1839 // If point is at the end of the buffer, the last excerpt is returned
1840 pub fn point_to_buffer_offset<T: ToOffset>(
1841 &self,
1842 point: T,
1843 cx: &App,
1844 ) -> Option<(Entity<Buffer>, BufferOffset)> {
1845 let snapshot = self.read(cx);
1846 let (buffer, offset) = snapshot.point_to_buffer_offset(point)?;
1847 Some((
1848 self.buffers.get(&buffer.remote_id())?.buffer.clone(),
1849 offset,
1850 ))
1851 }
1852
1853 // If point is at the end of the buffer, the last excerpt is returned
1854 pub fn point_to_buffer_point<T: ToPoint>(
1855 &self,
1856 point: T,
1857 cx: &App,
1858 ) -> Option<(Entity<Buffer>, Point)> {
1859 let snapshot = self.read(cx);
1860 let (buffer, point) = snapshot.point_to_buffer_point(point.to_point(&snapshot))?;
1861 Some((self.buffers.get(&buffer.remote_id())?.buffer.clone(), point))
1862 }
1863
1864 pub fn buffer_point_to_anchor(
1865 &self,
1866 // todo(lw): We shouldn't need this?
1867 buffer: &Entity<Buffer>,
1868 point: Point,
1869 cx: &App,
1870 ) -> Option<Anchor> {
1871 let mut found = None;
1872 let buffer_snapshot = buffer.read(cx).snapshot();
1873 let text_anchor = buffer_snapshot.anchor_after(&point);
1874 let snapshot = self.snapshot(cx);
1875 let path_key_index = snapshot.path_key_index_for_buffer(buffer_snapshot.remote_id())?;
1876 for excerpt in snapshot.excerpts_for_buffer(buffer_snapshot.remote_id()) {
1877 if excerpt
1878 .context
1879 .start
1880 .cmp(&text_anchor, &buffer_snapshot)
1881 .is_gt()
1882 {
1883 found = Some(Anchor::in_buffer(path_key_index, excerpt.context.start));
1884 break;
1885 } else if excerpt
1886 .context
1887 .end
1888 .cmp(&text_anchor, &buffer_snapshot)
1889 .is_ge()
1890 {
1891 found = Some(Anchor::in_buffer(path_key_index, text_anchor));
1892 break;
1893 }
1894 found = Some(Anchor::in_buffer(path_key_index, excerpt.context.end));
1895 }
1896
1897 found
1898 }
1899
1900 pub fn wait_for_anchors<'a, Anchors: 'a + Iterator<Item = Anchor>>(
1901 &self,
1902 anchors: Anchors,
1903 cx: &mut Context<Self>,
1904 ) -> impl 'static + Future<Output = Result<()>> + use<Anchors> {
1905 let mut error = None;
1906 let mut futures = Vec::new();
1907 for anchor in anchors {
1908 if let Some(excerpt_anchor) = anchor.excerpt_anchor() {
1909 if let Some(buffer) = self.buffers.get(&excerpt_anchor.text_anchor.buffer_id) {
1910 buffer.buffer.update(cx, |buffer, _| {
1911 futures.push(buffer.wait_for_anchors([excerpt_anchor.text_anchor()]))
1912 });
1913 } else {
1914 error = Some(anyhow!(
1915 "buffer {:?} is not part of this multi-buffer",
1916 excerpt_anchor.text_anchor.buffer_id
1917 ));
1918 break;
1919 }
1920 }
1921 }
1922 async move {
1923 if let Some(error) = error {
1924 Err(error)?;
1925 }
1926 for future in futures {
1927 future.await?;
1928 }
1929 Ok(())
1930 }
1931 }
1932
1933 pub fn text_anchor_for_position<T: ToOffset>(
1934 &self,
1935 position: T,
1936 cx: &App,
1937 ) -> Option<(Entity<Buffer>, text::Anchor)> {
1938 let snapshot = self.read(cx);
1939 let anchor = snapshot.anchor_before(position).excerpt_anchor()?;
1940 let buffer = self
1941 .buffers
1942 .get(&anchor.text_anchor.buffer_id)?
1943 .buffer
1944 .clone();
1945 Some((buffer, anchor.text_anchor()))
1946 }
1947
1948 fn on_buffer_event(
1949 &mut self,
1950 buffer: Entity<Buffer>,
1951 event: &language::BufferEvent,
1952 cx: &mut Context<Self>,
1953 ) {
1954 use language::BufferEvent;
1955 let buffer_id = buffer.read(cx).remote_id();
1956 cx.emit(match event {
1957 &BufferEvent::Edited { is_local } => Event::Edited {
1958 edited_buffer: Some(buffer),
1959 is_local,
1960 },
1961 BufferEvent::DirtyChanged => Event::DirtyChanged,
1962 BufferEvent::Saved => Event::Saved,
1963 BufferEvent::FileHandleChanged => Event::FileHandleChanged,
1964 BufferEvent::Reloaded => Event::Reloaded,
1965 BufferEvent::LanguageChanged(has_language) => {
1966 Event::LanguageChanged(buffer_id, *has_language)
1967 }
1968 BufferEvent::Reparsed => Event::Reparsed(buffer_id),
1969 BufferEvent::DiagnosticsUpdated => Event::DiagnosticsUpdated,
1970 BufferEvent::CapabilityChanged => {
1971 self.capability = buffer.read(cx).capability();
1972 return;
1973 }
1974 BufferEvent::Operation { .. } | BufferEvent::ReloadNeeded => return,
1975 });
1976 }
1977
1978 fn buffer_diff_language_changed(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
1979 let diff = diff.read(cx);
1980 let buffer_id = diff.buffer_id;
1981 let diff = DiffStateSnapshot {
1982 buffer_id,
1983 diff: diff.snapshot(cx),
1984 main_buffer: None,
1985 };
1986 self.snapshot.get_mut().diffs.insert_or_replace(diff, ());
1987 }
1988
1989 fn inverted_buffer_diff_language_changed(
1990 &mut self,
1991 diff: Entity<BufferDiff>,
1992 main_buffer: Entity<language::Buffer>,
1993 cx: &mut Context<Self>,
1994 ) {
1995 let base_text_buffer_id = diff.read(cx).base_text_buffer().read(cx).remote_id();
1996 let main_buffer_snapshot = main_buffer.read(cx).snapshot();
1997 let diff = diff.read(cx);
1998 let diff = DiffStateSnapshot {
1999 buffer_id: base_text_buffer_id,
2000 diff: diff.snapshot(cx),
2001 main_buffer: Some(main_buffer_snapshot),
2002 };
2003 self.snapshot.get_mut().diffs.insert_or_replace(diff, ());
2004 }
2005
2006 fn buffer_diff_changed(
2007 &mut self,
2008 diff: Entity<BufferDiff>,
2009 range: Range<text::Anchor>,
2010 cx: &mut Context<Self>,
2011 ) {
2012 let Some(buffer) = self.buffer(diff.read(cx).buffer_id) else {
2013 return;
2014 };
2015 let snapshot = self.sync_mut(cx);
2016
2017 let diff = diff.read(cx);
2018 let buffer_id = diff.buffer_id;
2019
2020 let Some(path) = snapshot.path_for_buffer(buffer_id).cloned() else {
2021 return;
2022 };
2023 let new_diff = DiffStateSnapshot {
2024 buffer_id,
2025 diff: diff.snapshot(cx),
2026 main_buffer: None,
2027 };
2028 let snapshot = self.snapshot.get_mut();
2029 let base_text_changed = find_diff_state(&snapshot.diffs, buffer_id)
2030 .is_none_or(|old_diff| !new_diff.base_texts_definitely_eq(old_diff));
2031 snapshot.diffs.insert_or_replace(new_diff, ());
2032
2033 let buffer = buffer.read(cx);
2034 let diff_change_range = range.to_offset(buffer);
2035
2036 let excerpt_edits = snapshot.excerpt_edits_for_diff_change(&path, diff_change_range);
2037 let edits = Self::sync_diff_transforms(
2038 snapshot,
2039 excerpt_edits,
2040 DiffChangeKind::DiffUpdated {
2041 base_changed: base_text_changed,
2042 },
2043 );
2044 if !edits.is_empty() {
2045 self.subscriptions.publish(edits);
2046 }
2047 cx.emit(Event::Edited {
2048 edited_buffer: None,
2049 is_local: true,
2050 });
2051 }
2052
2053 fn inverted_buffer_diff_changed(
2054 &mut self,
2055 diff: Entity<BufferDiff>,
2056 main_buffer: Entity<language::Buffer>,
2057 diff_change_range: Option<Range<usize>>,
2058 cx: &mut Context<Self>,
2059 ) {
2060 let snapshot = self.sync_mut(cx);
2061
2062 let base_text_buffer_id = diff.read(cx).base_text_buffer().read(cx).remote_id();
2063 let Some(path) = snapshot.path_for_buffer(base_text_buffer_id).cloned() else {
2064 return;
2065 };
2066
2067 let main_buffer_snapshot = main_buffer.read(cx).snapshot();
2068 let diff = diff.read(cx);
2069 let new_diff = DiffStateSnapshot {
2070 buffer_id: base_text_buffer_id,
2071 diff: diff.snapshot(cx),
2072 main_buffer: Some(main_buffer_snapshot),
2073 };
2074 let snapshot = self.snapshot.get_mut();
2075 snapshot.diffs.insert_or_replace(new_diff, ());
2076
2077 let Some(diff_change_range) = diff_change_range else {
2078 return;
2079 };
2080
2081 let excerpt_edits = snapshot.excerpt_edits_for_diff_change(&path, diff_change_range);
2082 let edits = Self::sync_diff_transforms(
2083 snapshot,
2084 excerpt_edits,
2085 DiffChangeKind::DiffUpdated {
2086 // We don't read this field for inverted diffs.
2087 base_changed: false,
2088 },
2089 );
2090 if !edits.is_empty() {
2091 self.subscriptions.publish(edits);
2092 }
2093 cx.emit(Event::Edited {
2094 edited_buffer: None,
2095 is_local: true,
2096 });
2097 }
2098
2099 pub fn all_buffers_iter(&self) -> impl Iterator<Item = Entity<Buffer>> {
2100 self.buffers.values().map(|state| state.buffer.clone())
2101 }
2102
2103 pub fn all_buffers(&self) -> HashSet<Entity<Buffer>> {
2104 self.all_buffers_iter().collect()
2105 }
2106
2107 pub fn buffer(&self, buffer_id: BufferId) -> Option<Entity<Buffer>> {
2108 self.buffers
2109 .get(&buffer_id)
2110 .map(|state| state.buffer.clone())
2111 }
2112
2113 pub fn language_at<T: ToOffset>(&self, point: T, cx: &App) -> Option<Arc<Language>> {
2114 self.point_to_buffer_offset(point, cx)
2115 .and_then(|(buffer, offset)| buffer.read(cx).language_at(offset))
2116 }
2117
2118 pub fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
2119 let snapshot = self.snapshot(cx);
2120 snapshot
2121 .excerpts
2122 .first()
2123 .and_then(|excerpt| self.buffer(excerpt.range.context.start.buffer_id))
2124 .map(|buffer| LanguageSettings::for_buffer(&buffer.read(cx), cx))
2125 .unwrap_or_else(move || self.language_settings_at(MultiBufferOffset::default(), cx))
2126 }
2127
2128 pub fn language_settings_at<'a, T: ToOffset>(
2129 &'a self,
2130 point: T,
2131 cx: &'a App,
2132 ) -> Cow<'a, LanguageSettings> {
2133 if let Some((buffer, offset)) = self.point_to_buffer_offset(point, cx) {
2134 LanguageSettings::for_buffer_at(buffer.read(cx), offset, cx)
2135 } else {
2136 Cow::Borrowed(&AllLanguageSettings::get_global(cx).defaults)
2137 }
2138 }
2139
2140 pub fn for_each_buffer(&self, f: &mut dyn FnMut(&Entity<Buffer>)) {
2141 self.buffers.values().for_each(|state| f(&state.buffer))
2142 }
2143
2144 pub fn explicit_title(&self) -> Option<&str> {
2145 self.title.as_deref()
2146 }
2147
2148 pub fn title<'a>(&'a self, cx: &'a App) -> Cow<'a, str> {
2149 if let Some(title) = self.title.as_ref() {
2150 return title.into();
2151 }
2152
2153 if let Some(buffer) = self.as_singleton() {
2154 let buffer = buffer.read(cx);
2155
2156 if let Some(file) = buffer.file() {
2157 return file.file_name(cx).into();
2158 }
2159
2160 if let Some(title) = self.buffer_content_title(buffer) {
2161 return title;
2162 }
2163 };
2164
2165 "untitled".into()
2166 }
2167
2168 fn buffer_content_title(&self, buffer: &Buffer) -> Option<Cow<'_, str>> {
2169 let mut is_leading_whitespace = true;
2170 let mut count = 0;
2171 let mut prev_was_space = false;
2172 let mut title = String::new();
2173
2174 for ch in buffer.snapshot().chars() {
2175 if is_leading_whitespace && ch.is_whitespace() {
2176 continue;
2177 }
2178
2179 is_leading_whitespace = false;
2180
2181 if ch == '\n' || count >= 40 {
2182 break;
2183 }
2184
2185 if ch.is_whitespace() {
2186 if !prev_was_space {
2187 title.push(' ');
2188 count += 1;
2189 prev_was_space = true;
2190 }
2191 } else {
2192 title.push(ch);
2193 count += 1;
2194 prev_was_space = false;
2195 }
2196 }
2197
2198 let title = title.trim_end().to_string();
2199
2200 if title.is_empty() {
2201 return None;
2202 }
2203
2204 Some(title.into())
2205 }
2206
2207 pub fn set_title(&mut self, title: String, cx: &mut Context<Self>) {
2208 self.title = Some(title);
2209 cx.notify();
2210 }
2211
2212 /// Preserve preview tabs containing this multibuffer until additional edits occur.
2213 pub fn refresh_preview(&self, cx: &mut Context<Self>) {
2214 for buffer_state in self.buffers.values() {
2215 buffer_state
2216 .buffer
2217 .update(cx, |buffer, _cx| buffer.refresh_preview());
2218 }
2219 }
2220
2221 /// Whether we should preserve the preview status of a tab containing this multi-buffer.
2222 pub fn preserve_preview(&self, cx: &App) -> bool {
2223 self.buffers
2224 .values()
2225 .all(|state| state.buffer.read(cx).preserve_preview())
2226 }
2227
2228 #[cfg(any(test, feature = "test-support"))]
2229 pub fn is_parsing(&self, cx: &App) -> bool {
2230 self.as_singleton().unwrap().read(cx).is_parsing()
2231 }
2232
2233 pub fn add_diff(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2234 let buffer_id = diff.read(cx).buffer_id;
2235
2236 if let Some(existing_diff) = self.diff_for(buffer_id)
2237 && diff.entity_id() == existing_diff.entity_id()
2238 {
2239 return;
2240 }
2241
2242 self.buffer_diff_changed(
2243 diff.clone(),
2244 text::Anchor::min_max_range_for_buffer(buffer_id),
2245 cx,
2246 );
2247 self.diffs.insert(buffer_id, DiffState::new(diff, cx));
2248 }
2249
2250 pub fn add_inverted_diff(
2251 &mut self,
2252 diff: Entity<BufferDiff>,
2253 main_buffer: Entity<language::Buffer>,
2254 cx: &mut Context<Self>,
2255 ) {
2256 let snapshot = diff.read(cx).base_text(cx);
2257 let base_text_buffer_id = snapshot.remote_id();
2258 let diff_change_range = 0..snapshot.len();
2259 self.snapshot.get_mut().has_inverted_diff = true;
2260 self.inverted_buffer_diff_changed(
2261 diff.clone(),
2262 main_buffer.clone(),
2263 Some(diff_change_range),
2264 cx,
2265 );
2266 self.diffs.insert(
2267 base_text_buffer_id,
2268 DiffState::new_inverted(diff, main_buffer, cx),
2269 );
2270 }
2271
2272 pub fn diff_for(&self, buffer_id: BufferId) -> Option<Entity<BufferDiff>> {
2273 self.diffs.get(&buffer_id).map(|state| state.diff.clone())
2274 }
2275
2276 pub fn expand_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2277 self.expand_or_collapse_diff_hunks(ranges, true, cx);
2278 }
2279
2280 pub fn collapse_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2281 self.expand_or_collapse_diff_hunks(ranges, false, cx);
2282 }
2283
2284 pub fn set_all_diff_hunks_expanded(&mut self, cx: &mut Context<Self>) {
2285 self.snapshot.get_mut().all_diff_hunks_expanded = true;
2286 self.expand_or_collapse_diff_hunks(vec![Anchor::Min..Anchor::Max], true, cx);
2287 }
2288
2289 pub fn all_diff_hunks_expanded(&self) -> bool {
2290 self.snapshot.borrow().all_diff_hunks_expanded
2291 }
2292
2293 pub fn set_all_diff_hunks_collapsed(&mut self, cx: &mut Context<Self>) {
2294 self.snapshot.get_mut().all_diff_hunks_expanded = false;
2295 self.expand_or_collapse_diff_hunks(vec![Anchor::Min..Anchor::Max], false, cx);
2296 }
2297
2298 pub fn set_show_deleted_hunks(&mut self, show: bool, cx: &mut Context<Self>) {
2299 self.snapshot.get_mut().show_deleted_hunks = show;
2300
2301 self.sync_mut(cx);
2302
2303 let old_len = self.snapshot.borrow().len();
2304
2305 let ranges = std::iter::once((Point::zero()..Point::MAX, None));
2306 let _ = self.expand_or_collapse_diff_hunks_inner(ranges, true, cx);
2307
2308 let new_len = self.snapshot.borrow().len();
2309
2310 self.subscriptions.publish(vec![Edit {
2311 old: MultiBufferOffset(0)..old_len,
2312 new: MultiBufferOffset(0)..new_len,
2313 }]);
2314
2315 cx.emit(Event::DiffHunksToggled);
2316 cx.emit(Event::Edited {
2317 edited_buffer: None,
2318 is_local: true,
2319 });
2320 }
2321
2322 pub fn set_use_extended_diff_range(&mut self, use_extended: bool, _cx: &mut Context<Self>) {
2323 self.snapshot.get_mut().use_extended_diff_range = use_extended;
2324 }
2325
2326 pub fn has_multiple_hunks(&self, cx: &App) -> bool {
2327 self.read(cx)
2328 .diff_hunks_in_range(Anchor::Min..Anchor::Max)
2329 .nth(1)
2330 .is_some()
2331 }
2332
2333 pub fn single_hunk_is_expanded(&self, range: Range<Anchor>, cx: &App) -> bool {
2334 let snapshot = self.read(cx);
2335 let mut cursor = snapshot.diff_transforms.cursor::<MultiBufferOffset>(());
2336 let offset_range = range.to_offset(&snapshot);
2337 cursor.seek(&offset_range.start, Bias::Left);
2338 while let Some(item) = cursor.item() {
2339 if *cursor.start() >= offset_range.end && *cursor.start() > offset_range.start {
2340 break;
2341 }
2342 if item.hunk_info().is_some() {
2343 return true;
2344 }
2345 cursor.next();
2346 }
2347 false
2348 }
2349
2350 pub fn has_expanded_diff_hunks_in_ranges(&self, ranges: &[Range<Anchor>], cx: &App) -> bool {
2351 let snapshot = self.read(cx);
2352 let mut cursor = snapshot.diff_transforms.cursor::<MultiBufferOffset>(());
2353 for range in ranges {
2354 let range = range.to_point(&snapshot);
2355 let start = snapshot.point_to_offset(Point::new(range.start.row, 0));
2356 let end = (snapshot.point_to_offset(Point::new(range.end.row + 1, 0)) + 1usize)
2357 .min(snapshot.len());
2358 cursor.seek(&start, Bias::Right);
2359 while let Some(item) = cursor.item() {
2360 if *cursor.start() >= end {
2361 break;
2362 }
2363 if item.hunk_info().is_some() {
2364 return true;
2365 }
2366 cursor.next();
2367 }
2368 }
2369 false
2370 }
2371
2372 pub fn expand_or_collapse_diff_hunks_inner(
2373 &mut self,
2374 ranges: impl IntoIterator<Item = (Range<Point>, Option<Anchor>)>,
2375 expand: bool,
2376 cx: &mut Context<Self>,
2377 ) -> Vec<Edit<MultiBufferOffset>> {
2378 if self.snapshot.borrow().all_diff_hunks_expanded && !expand {
2379 return Vec::new();
2380 }
2381 self.sync_mut(cx);
2382 let mut snapshot = self.snapshot.get_mut();
2383 let mut excerpt_edits = Vec::new();
2384 let mut last_hunk_row = None;
2385 for (range, end_anchor) in ranges {
2386 for diff_hunk in snapshot.diff_hunks_in_range(range) {
2387 if let Some(end_anchor) = &end_anchor
2388 && let Some(hunk_end_anchor) =
2389 snapshot.anchor_in_excerpt(diff_hunk.excerpt_range.context.end)
2390 && hunk_end_anchor.cmp(end_anchor, snapshot).is_gt()
2391 {
2392 continue;
2393 }
2394 let hunk_range = diff_hunk.multi_buffer_range;
2395 if let Some(excerpt_start_anchor) =
2396 snapshot.anchor_in_excerpt(diff_hunk.excerpt_range.context.start)
2397 && hunk_range.start.to_point(snapshot) < excerpt_start_anchor.to_point(snapshot)
2398 {
2399 continue;
2400 }
2401 if last_hunk_row.is_some_and(|row| row >= diff_hunk.row_range.start) {
2402 continue;
2403 }
2404 let mut start = snapshot.excerpt_offset_for_anchor(&hunk_range.start);
2405 let mut end = snapshot.excerpt_offset_for_anchor(&hunk_range.end);
2406 if let Some(excerpt_end_anchor) =
2407 snapshot.anchor_in_excerpt(diff_hunk.excerpt_range.context.end)
2408 {
2409 let excerpt_end = snapshot.excerpt_offset_for_anchor(&excerpt_end_anchor);
2410 start = start.min(excerpt_end);
2411 end = end.min(excerpt_end);
2412 };
2413 last_hunk_row = Some(diff_hunk.row_range.start);
2414 excerpt_edits.push(text::Edit {
2415 old: start..end,
2416 new: start..end,
2417 });
2418 }
2419 }
2420
2421 Self::sync_diff_transforms(
2422 &mut snapshot,
2423 excerpt_edits,
2424 DiffChangeKind::ExpandOrCollapseHunks { expand },
2425 )
2426 }
2427
2428 pub fn expand_or_collapse_diff_hunks(
2429 &mut self,
2430 ranges: Vec<Range<Anchor>>,
2431 expand: bool,
2432 cx: &mut Context<Self>,
2433 ) {
2434 let snapshot = self.snapshot.borrow().clone();
2435 let ranges =
2436 ranges.iter().map(move |range| {
2437 let excerpt_end = snapshot.excerpt_containing(range.end..range.end).and_then(
2438 |(_, excerpt_range)| snapshot.anchor_in_excerpt(excerpt_range.context.end),
2439 );
2440 let range = range.to_point(&snapshot);
2441 let mut peek_end = range.end;
2442 if range.end.row < snapshot.max_row().0 {
2443 peek_end = Point::new(range.end.row + 1, 0);
2444 };
2445 (range.start..peek_end, excerpt_end)
2446 });
2447 let edits = self.expand_or_collapse_diff_hunks_inner(ranges, expand, cx);
2448 if !edits.is_empty() {
2449 self.subscriptions.publish(edits);
2450 }
2451 cx.emit(Event::DiffHunksToggled);
2452 cx.emit(Event::Edited {
2453 edited_buffer: None,
2454 is_local: true,
2455 });
2456 }
2457
2458 #[ztracing::instrument(skip_all)]
2459 fn sync(&self, cx: &App) {
2460 let changed = self.buffer_changed_since_sync.replace(false);
2461 if !changed {
2462 return;
2463 }
2464 let edits = Self::sync_from_buffer_changes(
2465 &mut self.snapshot.borrow_mut(),
2466 &self.buffers,
2467 &self.diffs,
2468 cx,
2469 );
2470 if !edits.is_empty() {
2471 self.subscriptions.publish(edits);
2472 }
2473 }
2474
2475 fn sync_mut(&mut self, cx: &App) -> &mut MultiBufferSnapshot {
2476 let snapshot = self.snapshot.get_mut();
2477 let changed = self.buffer_changed_since_sync.replace(false);
2478 if !changed {
2479 return snapshot;
2480 }
2481 let edits = Self::sync_from_buffer_changes(snapshot, &self.buffers, &self.diffs, cx);
2482
2483 if !edits.is_empty() {
2484 self.subscriptions.publish(edits);
2485 }
2486
2487 snapshot
2488 }
2489
2490 fn sync_from_buffer_changes(
2491 snapshot: &mut MultiBufferSnapshot,
2492 buffers: &BTreeMap<BufferId, BufferState>,
2493 diffs: &HashMap<BufferId, DiffState>,
2494 cx: &App,
2495 ) -> Vec<Edit<MultiBufferOffset>> {
2496 let MultiBufferSnapshot {
2497 excerpts,
2498 diffs: buffer_diff,
2499 buffers: buffer_snapshots,
2500 path_keys_by_index: _,
2501 indices_by_path_key: _,
2502 diff_transforms: _,
2503 non_text_state_update_count,
2504 edit_count,
2505 is_dirty,
2506 has_deleted_file,
2507 has_conflict,
2508 has_inverted_diff: _,
2509 singleton: _,
2510 trailing_excerpt_update_count: _,
2511 all_diff_hunks_expanded: _,
2512 show_deleted_hunks: _,
2513 use_extended_diff_range: _,
2514 show_headers: _,
2515 } = snapshot;
2516 *is_dirty = false;
2517 *has_deleted_file = false;
2518 *has_conflict = false;
2519
2520 if !diffs.is_empty() {
2521 let mut diffs_to_add = Vec::new();
2522 for (id, diff) in diffs {
2523 if find_diff_state(buffer_diff, *id).is_none_or(|existing_diff| {
2524 if existing_diff.main_buffer.is_none() {
2525 return false;
2526 }
2527 let base_text = diff.diff.read(cx).base_text_buffer().read(cx);
2528 base_text.remote_id() != existing_diff.base_text().remote_id()
2529 || base_text
2530 .version()
2531 .changed_since(existing_diff.base_text().version())
2532 }) {
2533 if diffs_to_add.capacity() == 0 {
2534 diffs_to_add.reserve(diffs.len());
2535 }
2536 diffs_to_add.push(sum_tree::Edit::Insert(diff.snapshot(*id, cx)));
2537 }
2538 }
2539 buffer_diff.edit(diffs_to_add, ());
2540 }
2541
2542 let mut paths_to_edit = Vec::new();
2543 let mut non_text_state_updated = false;
2544 let mut edited = false;
2545 for buffer_state in buffers.values() {
2546 let buffer = buffer_state.buffer.read(cx);
2547 let last_snapshot = buffer_snapshots
2548 .get(&buffer.remote_id())
2549 .expect("each buffer should have a snapshot");
2550 let current_version = buffer.version();
2551 let non_text_state_update_count = buffer.non_text_state_update_count();
2552
2553 let buffer_edited =
2554 current_version.changed_since(last_snapshot.buffer_snapshot.version());
2555 let buffer_non_text_state_updated = non_text_state_update_count
2556 > last_snapshot.buffer_snapshot.non_text_state_update_count();
2557 if buffer_edited || buffer_non_text_state_updated {
2558 paths_to_edit.push((
2559 last_snapshot.path_key.clone(),
2560 last_snapshot.path_key_index,
2561 buffer_state.buffer.clone(),
2562 if buffer_edited {
2563 Some(last_snapshot.buffer_snapshot.version().clone())
2564 } else {
2565 None
2566 },
2567 ));
2568 }
2569
2570 edited |= buffer_edited;
2571 non_text_state_updated |= buffer_non_text_state_updated;
2572 *is_dirty |= buffer.is_dirty();
2573 *has_deleted_file |= buffer
2574 .file()
2575 .is_some_and(|file| file.disk_state().is_deleted());
2576 *has_conflict |= buffer.has_conflict();
2577 }
2578 if edited {
2579 *edit_count += 1;
2580 }
2581 if non_text_state_updated {
2582 *non_text_state_update_count += 1;
2583 }
2584
2585 paths_to_edit.sort_unstable_by_key(|(path, _, _, _)| path.clone());
2586
2587 let mut edits = Vec::new();
2588 let mut new_excerpts = SumTree::default();
2589 let mut cursor = excerpts.cursor::<ExcerptSummary>(());
2590
2591 for (path, path_key_index, buffer, prev_version) in paths_to_edit {
2592 new_excerpts.append(cursor.slice(&path, Bias::Left), ());
2593 let buffer = buffer.read(cx);
2594 let buffer_id = buffer.remote_id();
2595
2596 buffer_snapshots.insert(
2597 buffer_id,
2598 BufferStateSnapshot {
2599 path_key: path.clone(),
2600 path_key_index,
2601 buffer_snapshot: buffer.snapshot(),
2602 },
2603 );
2604
2605 if let Some(prev_version) = &prev_version {
2606 while let Some(old_excerpt) = cursor.item()
2607 && &old_excerpt.path_key == &path
2608 {
2609 edits.extend(
2610 buffer
2611 .edits_since_in_range::<usize>(
2612 prev_version,
2613 old_excerpt.range.context.clone(),
2614 )
2615 .map(|edit| {
2616 let excerpt_old_start = cursor.start().len();
2617 let excerpt_new_start =
2618 ExcerptDimension(new_excerpts.summary().text.len);
2619 let old_start = excerpt_old_start + edit.old.start;
2620 let old_end = excerpt_old_start + edit.old.end;
2621 let new_start = excerpt_new_start + edit.new.start;
2622 let new_end = excerpt_new_start + edit.new.end;
2623 Edit {
2624 old: old_start..old_end,
2625 new: new_start..new_end,
2626 }
2627 }),
2628 );
2629
2630 let excerpt = Excerpt::new(
2631 old_excerpt.path_key.clone(),
2632 old_excerpt.path_key_index,
2633 &buffer.snapshot(),
2634 old_excerpt.range.clone(),
2635 old_excerpt.has_trailing_newline,
2636 );
2637 new_excerpts.push(excerpt, ());
2638 cursor.next();
2639 }
2640 } else {
2641 new_excerpts.append(cursor.slice(&path, Bias::Right), ());
2642 };
2643 }
2644 new_excerpts.append(cursor.suffix(), ());
2645
2646 drop(cursor);
2647 *excerpts = new_excerpts;
2648
2649 Self::sync_diff_transforms(snapshot, edits, DiffChangeKind::BufferEdited)
2650 }
2651
2652 fn sync_diff_transforms(
2653 snapshot: &mut MultiBufferSnapshot,
2654 excerpt_edits: Vec<text::Edit<ExcerptOffset>>,
2655 change_kind: DiffChangeKind,
2656 ) -> Vec<Edit<MultiBufferOffset>> {
2657 if excerpt_edits.is_empty() {
2658 return vec![];
2659 }
2660
2661 let mut excerpts = snapshot.excerpts.cursor::<ExcerptOffset>(());
2662 let mut old_diff_transforms = snapshot
2663 .diff_transforms
2664 .cursor::<Dimensions<ExcerptOffset, MultiBufferOffset>>(());
2665 let mut new_diff_transforms = SumTree::default();
2666 let mut old_expanded_hunks = HashSet::default();
2667 let mut output_edits = Vec::new();
2668 let mut output_delta = 0_isize;
2669 let mut at_transform_boundary = true;
2670 let mut end_of_current_insert = None;
2671
2672 let mut excerpt_edits = excerpt_edits.into_iter().peekable();
2673 while let Some(edit) = excerpt_edits.next() {
2674 excerpts.seek_forward(&edit.new.start, Bias::Right);
2675 if excerpts.item().is_none() && *excerpts.start() == edit.new.start {
2676 excerpts.prev();
2677 }
2678
2679 // Keep any transforms that are before the edit.
2680 if at_transform_boundary {
2681 at_transform_boundary = false;
2682 let transforms_before_edit = old_diff_transforms.slice(&edit.old.start, Bias::Left);
2683 Self::append_diff_transforms(&mut new_diff_transforms, transforms_before_edit);
2684 if let Some(transform) = old_diff_transforms.item()
2685 && old_diff_transforms.end().0 == edit.old.start
2686 && old_diff_transforms.start().0 < edit.old.start
2687 {
2688 Self::push_diff_transform(&mut new_diff_transforms, transform.clone());
2689 old_diff_transforms.next();
2690 }
2691 }
2692
2693 // Compute the start of the edit in output coordinates.
2694 let edit_start_overshoot = edit.old.start - old_diff_transforms.start().0;
2695 let edit_old_start = old_diff_transforms.start().1 + edit_start_overshoot;
2696 let edit_new_start =
2697 MultiBufferOffset((edit_old_start.0 as isize + output_delta) as usize);
2698
2699 let changed_diff_hunks = Self::recompute_diff_transforms_for_edit(
2700 &edit,
2701 &mut excerpts,
2702 &mut old_diff_transforms,
2703 &mut new_diff_transforms,
2704 &mut end_of_current_insert,
2705 &mut old_expanded_hunks,
2706 snapshot,
2707 change_kind,
2708 );
2709
2710 // Compute the end of the edit in output coordinates.
2711 let edit_old_end_overshoot = edit.old.end - old_diff_transforms.start().0;
2712 let edit_new_end_overshoot = edit.new.end - new_diff_transforms.summary().excerpt_len();
2713 let edit_old_end = old_diff_transforms.start().1 + edit_old_end_overshoot;
2714 let edit_new_end = new_diff_transforms.summary().output.len + edit_new_end_overshoot;
2715 let output_edit = Edit {
2716 old: edit_old_start..edit_old_end,
2717 new: edit_new_start..edit_new_end,
2718 };
2719
2720 output_delta += (output_edit.new.end - output_edit.new.start) as isize;
2721 output_delta -= (output_edit.old.end - output_edit.old.start) as isize;
2722 if changed_diff_hunks || matches!(change_kind, DiffChangeKind::BufferEdited) {
2723 output_edits.push(output_edit);
2724 }
2725
2726 // If this is the last edit that intersects the current diff transform,
2727 // then recreate the content up to the end of this transform, to prepare
2728 // for reusing additional slices of the old transforms.
2729 if excerpt_edits
2730 .peek()
2731 .is_none_or(|next_edit| next_edit.old.start >= old_diff_transforms.end().0)
2732 {
2733 let keep_next_old_transform = (old_diff_transforms.start().0 >= edit.old.end)
2734 && match old_diff_transforms.item() {
2735 Some(DiffTransform::BufferContent {
2736 inserted_hunk_info: Some(hunk),
2737 ..
2738 }) => excerpts.item().is_some_and(|excerpt| {
2739 if let Some(diff) = find_diff_state(&snapshot.diffs, excerpt.buffer_id)
2740 && diff.main_buffer.is_some()
2741 {
2742 return true;
2743 }
2744 hunk.hunk_start_anchor
2745 .is_valid(&excerpt.buffer_snapshot(&snapshot))
2746 }),
2747 _ => true,
2748 };
2749
2750 let mut excerpt_offset = edit.new.end;
2751 if !keep_next_old_transform {
2752 excerpt_offset += old_diff_transforms.end().0 - edit.old.end;
2753 old_diff_transforms.next();
2754 }
2755
2756 old_expanded_hunks.clear();
2757 Self::push_buffer_content_transform(
2758 snapshot,
2759 &mut new_diff_transforms,
2760 excerpt_offset,
2761 end_of_current_insert,
2762 );
2763 at_transform_boundary = true;
2764 }
2765 }
2766
2767 // Keep any transforms that are after the last edit.
2768 Self::append_diff_transforms(&mut new_diff_transforms, old_diff_transforms.suffix());
2769
2770 // Ensure there's always at least one buffer content transform.
2771 if new_diff_transforms.is_empty() {
2772 new_diff_transforms.push(
2773 DiffTransform::BufferContent {
2774 summary: Default::default(),
2775 inserted_hunk_info: None,
2776 },
2777 (),
2778 );
2779 }
2780
2781 drop(old_diff_transforms);
2782 drop(excerpts);
2783 snapshot.diff_transforms = new_diff_transforms;
2784 snapshot.edit_count += 1;
2785
2786 #[cfg(any(test, feature = "test-support"))]
2787 snapshot.check_invariants();
2788 output_edits
2789 }
2790
2791 fn recompute_diff_transforms_for_edit(
2792 edit: &Edit<ExcerptOffset>,
2793 excerpts: &mut Cursor<Excerpt, ExcerptOffset>,
2794 old_diff_transforms: &mut Cursor<
2795 DiffTransform,
2796 Dimensions<ExcerptOffset, MultiBufferOffset>,
2797 >,
2798 new_diff_transforms: &mut SumTree<DiffTransform>,
2799 end_of_current_insert: &mut Option<(ExcerptOffset, DiffTransformHunkInfo)>,
2800 old_expanded_hunks: &mut HashSet<DiffTransformHunkInfo>,
2801 snapshot: &MultiBufferSnapshot,
2802 change_kind: DiffChangeKind,
2803 ) -> bool {
2804 log::trace!(
2805 "recomputing diff transform for edit {:?} => {:?}",
2806 edit.old.start..edit.old.end,
2807 edit.new.start..edit.new.end
2808 );
2809
2810 // Record which hunks were previously expanded.
2811 while let Some(item) = old_diff_transforms.item() {
2812 if let Some(hunk_info) = item.hunk_info() {
2813 log::trace!(
2814 "previously expanded hunk at {:?}",
2815 old_diff_transforms.start()
2816 );
2817 old_expanded_hunks.insert(hunk_info);
2818 }
2819 if old_diff_transforms.end().0 > edit.old.end {
2820 break;
2821 }
2822 old_diff_transforms.next();
2823 }
2824
2825 // Avoid querying diff hunks if there's no possibility of hunks being expanded.
2826 // For inverted diffs, hunks are always shown, so we can't skip this.
2827 let all_diff_hunks_expanded = snapshot.all_diff_hunks_expanded;
2828 if old_expanded_hunks.is_empty()
2829 && change_kind == DiffChangeKind::BufferEdited
2830 && !all_diff_hunks_expanded
2831 && !snapshot.has_inverted_diff
2832 {
2833 return false;
2834 }
2835
2836 // Visit each excerpt that intersects the edit.
2837 let mut did_expand_hunks = false;
2838 while let Some(excerpt) = excerpts.item() {
2839 // Recompute the expanded hunks in the portion of the excerpt that
2840 // intersects the edit.
2841 if let Some(diff) = find_diff_state(&snapshot.diffs, excerpt.buffer_id) {
2842 let buffer_snapshot = &excerpt.buffer_snapshot(&snapshot);
2843 let excerpt_start = *excerpts.start();
2844 let excerpt_end = excerpt_start + excerpt.text_summary.len;
2845 let excerpt_buffer_start = excerpt.range.context.start.to_offset(buffer_snapshot);
2846 let excerpt_buffer_end = excerpt_buffer_start + excerpt.text_summary.len;
2847 let edit_buffer_start =
2848 excerpt_buffer_start + edit.new.start.saturating_sub(excerpt_start);
2849 let edit_buffer_end =
2850 excerpt_buffer_start + edit.new.end.saturating_sub(excerpt_start);
2851 let edit_buffer_end = edit_buffer_end.min(excerpt_buffer_end);
2852
2853 if let Some(main_buffer) = &diff.main_buffer {
2854 for hunk in diff.hunks_intersecting_base_text_range(
2855 edit_buffer_start..edit_buffer_end,
2856 main_buffer,
2857 ) {
2858 did_expand_hunks = true;
2859 let hunk_buffer_range = hunk.diff_base_byte_range.clone();
2860 if hunk_buffer_range.start < excerpt_buffer_start {
2861 log::trace!("skipping hunk that starts before excerpt");
2862 continue;
2863 }
2864 let hunk_excerpt_start = excerpt_start
2865 + hunk_buffer_range.start.saturating_sub(excerpt_buffer_start);
2866 let hunk_excerpt_end = excerpt_end
2867 .min(excerpt_start + (hunk_buffer_range.end - excerpt_buffer_start));
2868 Self::push_buffer_content_transform(
2869 snapshot,
2870 new_diff_transforms,
2871 hunk_excerpt_start,
2872 *end_of_current_insert,
2873 );
2874 if !hunk_buffer_range.is_empty() {
2875 let hunk_info = DiffTransformHunkInfo {
2876 buffer_id: buffer_snapshot.remote_id(),
2877 hunk_start_anchor: hunk.buffer_range.start,
2878 hunk_secondary_status: hunk.secondary_status,
2879 excerpt_end: excerpt.end_anchor(),
2880 is_logically_deleted: true,
2881 };
2882 *end_of_current_insert =
2883 Some((hunk_excerpt_end.min(excerpt_end), hunk_info));
2884 }
2885 }
2886 } else {
2887 let edit_anchor_range = buffer_snapshot.anchor_before(edit_buffer_start)
2888 ..buffer_snapshot.anchor_after(edit_buffer_end);
2889 for hunk in diff.hunks_intersecting_range(edit_anchor_range, buffer_snapshot) {
2890 if hunk.is_created_file() && !all_diff_hunks_expanded {
2891 continue;
2892 }
2893
2894 let hunk_buffer_range = hunk.buffer_range.to_offset(buffer_snapshot);
2895 if hunk_buffer_range.start < excerpt_buffer_start {
2896 log::trace!("skipping hunk that starts before excerpt");
2897 continue;
2898 }
2899
2900 let hunk_info = DiffTransformHunkInfo {
2901 buffer_id: buffer_snapshot.remote_id(),
2902 hunk_start_anchor: hunk.buffer_range.start,
2903 hunk_secondary_status: hunk.secondary_status,
2904 excerpt_end: excerpt.end_anchor(),
2905 is_logically_deleted: false,
2906 };
2907
2908 let hunk_excerpt_start = excerpt_start
2909 + hunk_buffer_range.start.saturating_sub(excerpt_buffer_start);
2910 let hunk_excerpt_end = excerpt_end
2911 .min(excerpt_start + (hunk_buffer_range.end - excerpt_buffer_start));
2912
2913 Self::push_buffer_content_transform(
2914 snapshot,
2915 new_diff_transforms,
2916 hunk_excerpt_start,
2917 *end_of_current_insert,
2918 );
2919
2920 // For every existing hunk, determine if it was previously expanded
2921 // and if it should currently be expanded.
2922 let was_previously_expanded = old_expanded_hunks.contains(&hunk_info);
2923 let should_expand_hunk = match &change_kind {
2924 DiffChangeKind::DiffUpdated { base_changed: true } => {
2925 was_previously_expanded || all_diff_hunks_expanded
2926 }
2927 DiffChangeKind::ExpandOrCollapseHunks { expand } => {
2928 let intersects = hunk_buffer_range.is_empty()
2929 || (hunk_buffer_range.end > edit_buffer_start);
2930 if *expand {
2931 intersects || was_previously_expanded || all_diff_hunks_expanded
2932 } else {
2933 !intersects
2934 && (was_previously_expanded || all_diff_hunks_expanded)
2935 }
2936 }
2937 _ => was_previously_expanded || all_diff_hunks_expanded,
2938 };
2939
2940 if should_expand_hunk {
2941 did_expand_hunks = true;
2942 log::trace!(
2943 "expanding hunk {:?}",
2944 hunk_excerpt_start..hunk_excerpt_end,
2945 );
2946
2947 if !hunk.diff_base_byte_range.is_empty()
2948 && hunk_buffer_range.start >= edit_buffer_start
2949 && hunk_buffer_range.start <= excerpt_buffer_end
2950 && snapshot.show_deleted_hunks
2951 {
2952 let base_text = diff.base_text();
2953 let mut text_cursor =
2954 base_text.as_rope().cursor(hunk.diff_base_byte_range.start);
2955 let mut base_text_summary = text_cursor
2956 .summary::<TextSummary>(hunk.diff_base_byte_range.end);
2957
2958 let mut has_trailing_newline = false;
2959 if base_text_summary.last_line_chars > 0 {
2960 base_text_summary += TextSummary::newline();
2961 has_trailing_newline = true;
2962 }
2963
2964 new_diff_transforms.push(
2965 DiffTransform::DeletedHunk {
2966 base_text_byte_range: hunk.diff_base_byte_range.clone(),
2967 summary: base_text_summary,
2968 buffer_id: buffer_snapshot.remote_id(),
2969 hunk_info,
2970 has_trailing_newline,
2971 },
2972 (),
2973 );
2974 }
2975
2976 if !hunk_buffer_range.is_empty() {
2977 *end_of_current_insert =
2978 Some((hunk_excerpt_end.min(excerpt_end), hunk_info));
2979 }
2980 }
2981 }
2982 }
2983 }
2984
2985 if excerpts.end() <= edit.new.end {
2986 excerpts.next();
2987 } else {
2988 break;
2989 }
2990 }
2991
2992 did_expand_hunks || !old_expanded_hunks.is_empty()
2993 }
2994
2995 fn append_diff_transforms(
2996 new_transforms: &mut SumTree<DiffTransform>,
2997 subtree: SumTree<DiffTransform>,
2998 ) {
2999 if let Some(DiffTransform::BufferContent {
3000 inserted_hunk_info,
3001 summary,
3002 }) = subtree.first()
3003 && Self::extend_last_buffer_content_transform(
3004 new_transforms,
3005 *inserted_hunk_info,
3006 *summary,
3007 )
3008 {
3009 let mut cursor = subtree.cursor::<()>(());
3010 cursor.next();
3011 cursor.next();
3012 new_transforms.append(cursor.suffix(), ());
3013 return;
3014 }
3015 new_transforms.append(subtree, ());
3016 }
3017
3018 fn push_diff_transform(new_transforms: &mut SumTree<DiffTransform>, transform: DiffTransform) {
3019 if let DiffTransform::BufferContent {
3020 inserted_hunk_info: inserted_hunk_anchor,
3021 summary,
3022 } = transform
3023 && Self::extend_last_buffer_content_transform(
3024 new_transforms,
3025 inserted_hunk_anchor,
3026 summary,
3027 )
3028 {
3029 return;
3030 }
3031 new_transforms.push(transform, ());
3032 }
3033
3034 fn push_buffer_content_transform(
3035 old_snapshot: &MultiBufferSnapshot,
3036 new_transforms: &mut SumTree<DiffTransform>,
3037 end_offset: ExcerptOffset,
3038 current_inserted_hunk: Option<(ExcerptOffset, DiffTransformHunkInfo)>,
3039 ) {
3040 let inserted_region = current_inserted_hunk.map(|(insertion_end_offset, hunk_info)| {
3041 (end_offset.min(insertion_end_offset), Some(hunk_info))
3042 });
3043 let unchanged_region = [(end_offset, None)];
3044
3045 for (end_offset, inserted_hunk_info) in inserted_region.into_iter().chain(unchanged_region)
3046 {
3047 let start_offset = new_transforms.summary().excerpt_len();
3048 if end_offset <= start_offset {
3049 continue;
3050 }
3051 let summary_to_add = old_snapshot
3052 .text_summary_for_excerpt_offset_range::<MBTextSummary>(start_offset..end_offset);
3053
3054 if !Self::extend_last_buffer_content_transform(
3055 new_transforms,
3056 inserted_hunk_info,
3057 summary_to_add,
3058 ) {
3059 new_transforms.push(
3060 DiffTransform::BufferContent {
3061 summary: summary_to_add,
3062 inserted_hunk_info,
3063 },
3064 (),
3065 )
3066 }
3067 }
3068 }
3069
3070 fn extend_last_buffer_content_transform(
3071 new_transforms: &mut SumTree<DiffTransform>,
3072 new_inserted_hunk_info: Option<DiffTransformHunkInfo>,
3073 summary_to_add: MBTextSummary,
3074 ) -> bool {
3075 let mut did_extend = false;
3076 new_transforms.update_last(
3077 |last_transform| {
3078 if let DiffTransform::BufferContent {
3079 summary,
3080 inserted_hunk_info: inserted_hunk_anchor,
3081 } = last_transform
3082 && *inserted_hunk_anchor == new_inserted_hunk_info
3083 {
3084 *summary += summary_to_add;
3085 did_extend = true;
3086 }
3087 },
3088 (),
3089 );
3090 did_extend
3091 }
3092
3093 pub fn toggle_single_diff_hunk(&mut self, range: Range<Anchor>, cx: &mut Context<Self>) {
3094 let snapshot = self.snapshot(cx);
3095 let excerpt_end = snapshot
3096 .excerpt_containing(range.end..range.end)
3097 .and_then(|(_, excerpt_range)| snapshot.anchor_in_excerpt(excerpt_range.context.end));
3098 let point_range = range.to_point(&snapshot);
3099 let expand = !self.single_hunk_is_expanded(range, cx);
3100 let edits =
3101 self.expand_or_collapse_diff_hunks_inner([(point_range, excerpt_end)], expand, cx);
3102 if !edits.is_empty() {
3103 self.subscriptions.publish(edits);
3104 }
3105 cx.emit(Event::DiffHunksToggled);
3106 cx.emit(Event::Edited {
3107 edited_buffer: None,
3108 is_local: true,
3109 });
3110 }
3111}
3112
3113fn build_excerpt_ranges(
3114 ranges: impl IntoIterator<Item = Range<Point>>,
3115 context_line_count: u32,
3116 buffer_snapshot: &BufferSnapshot,
3117) -> Vec<ExcerptRange<Point>> {
3118 ranges
3119 .into_iter()
3120 .map(|range| {
3121 let start_row = range.start.row.saturating_sub(context_line_count);
3122 let start = Point::new(start_row, 0);
3123 let end_row = (range.end.row + context_line_count).min(buffer_snapshot.max_point().row);
3124 let end = Point::new(end_row, buffer_snapshot.line_len(end_row));
3125 ExcerptRange {
3126 context: start..end,
3127 primary: range,
3128 }
3129 })
3130 .collect()
3131}
3132
3133#[cfg(any(test, feature = "test-support"))]
3134impl MultiBuffer {
3135 pub fn build_simple(text: &str, cx: &mut gpui::App) -> Entity<Self> {
3136 let buffer = cx.new(|cx| Buffer::local(text, cx));
3137 cx.new(|cx| Self::singleton(buffer, cx))
3138 }
3139
3140 pub fn build_multi<const COUNT: usize>(
3141 excerpts: [(&str, Vec<Range<Point>>); COUNT],
3142 cx: &mut gpui::App,
3143 ) -> Entity<Self> {
3144 let multi = cx.new(|_| Self::new(Capability::ReadWrite));
3145 for (ix, (text, ranges)) in excerpts.into_iter().enumerate() {
3146 let buffer = cx.new(|cx| Buffer::local(text, cx));
3147 let snapshot = buffer.read(cx).snapshot();
3148 let excerpt_ranges = ranges
3149 .into_iter()
3150 .map(ExcerptRange::new)
3151 .collect::<Vec<_>>();
3152 multi.update(cx, |multi, cx| {
3153 multi.set_excerpt_ranges_for_path(
3154 PathKey::sorted(ix as u64),
3155 buffer,
3156 &snapshot,
3157 excerpt_ranges,
3158 cx,
3159 )
3160 });
3161 }
3162
3163 multi
3164 }
3165
3166 pub fn build_from_buffer(buffer: Entity<Buffer>, cx: &mut gpui::App) -> Entity<Self> {
3167 cx.new(|cx| Self::singleton(buffer, cx))
3168 }
3169
3170 pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::App) -> Entity<Self> {
3171 cx.new(|cx| {
3172 let mut multibuffer = MultiBuffer::new(Capability::ReadWrite);
3173 let mutation_count = rng.random_range(1..=5);
3174 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
3175 multibuffer
3176 })
3177 }
3178
3179 pub fn randomly_edit(
3180 &mut self,
3181 rng: &mut impl rand::Rng,
3182 edit_count: usize,
3183 cx: &mut Context<Self>,
3184 ) {
3185 use util::RandomCharIter;
3186
3187 let snapshot = self.read(cx);
3188 let mut edits: Vec<(Range<MultiBufferOffset>, Arc<str>)> = Vec::new();
3189 let mut last_end = None;
3190 for _ in 0..edit_count {
3191 if last_end.is_some_and(|last_end| last_end >= snapshot.len()) {
3192 break;
3193 }
3194
3195 let new_start = last_end.map_or(MultiBufferOffset::ZERO, |last_end| last_end + 1usize);
3196 let end =
3197 snapshot.clip_offset(rng.random_range(new_start..=snapshot.len()), Bias::Right);
3198 let start = snapshot.clip_offset(rng.random_range(new_start..=end), Bias::Right);
3199 last_end = Some(end);
3200
3201 let mut range = start..end;
3202 if rng.random_bool(0.2) {
3203 mem::swap(&mut range.start, &mut range.end);
3204 }
3205
3206 let new_text_len = rng.random_range(0..10);
3207 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
3208
3209 edits.push((range, new_text.into()));
3210 }
3211 log::info!("mutating multi-buffer with {:?}", edits);
3212 drop(snapshot);
3213
3214 self.edit(edits, None, cx);
3215 }
3216
3217 pub fn randomly_edit_excerpts(
3218 &mut self,
3219 rng: &mut impl rand::Rng,
3220 mutation_count: usize,
3221 cx: &mut Context<Self>,
3222 ) {
3223 use rand::prelude::*;
3224 use std::env;
3225 use util::RandomCharIter;
3226
3227 let max_buffers = env::var("MAX_BUFFERS")
3228 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
3229 .unwrap_or(5);
3230
3231 let mut buffers = Vec::new();
3232 for _ in 0..mutation_count {
3233 let snapshot = self.snapshot(cx);
3234 let buffer_ids = snapshot.all_buffer_ids().collect::<Vec<_>>();
3235 if buffer_ids.is_empty() || (rng.random() && buffer_ids.len() < max_buffers) {
3236 let buffer_handle = if rng.random() || self.buffers.is_empty() {
3237 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
3238 buffers.push(cx.new(|cx| Buffer::local(text, cx)));
3239 let buffer = buffers.last().unwrap().read(cx);
3240 log::info!(
3241 "Creating new buffer {} with text: {:?}",
3242 buffer.remote_id(),
3243 buffer.text()
3244 );
3245 buffers.last().unwrap().clone()
3246 } else {
3247 self.buffers.values().choose(rng).unwrap().buffer.clone()
3248 };
3249
3250 let buffer = buffer_handle.read(cx);
3251 let buffer_text = buffer.text();
3252 let buffer_snapshot = buffer.snapshot();
3253 let mut next_min_start_ix = 0;
3254 let ranges = (0..rng.random_range(0..5))
3255 .filter_map(|_| {
3256 if next_min_start_ix >= buffer.len() {
3257 return None;
3258 }
3259 let end_ix = buffer.clip_offset(
3260 rng.random_range(next_min_start_ix..=buffer.len()),
3261 Bias::Right,
3262 );
3263 let start_ix = buffer
3264 .clip_offset(rng.random_range(next_min_start_ix..=end_ix), Bias::Left);
3265 next_min_start_ix = buffer.text().ceil_char_boundary(end_ix + 1);
3266 Some(ExcerptRange::new(start_ix..end_ix))
3267 })
3268 .collect::<Vec<_>>();
3269 log::info!(
3270 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
3271 buffer_handle.read(cx).remote_id(),
3272 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
3273 ranges
3274 .iter()
3275 .map(|r| &buffer_text[r.context.clone()])
3276 .collect::<Vec<_>>()
3277 );
3278
3279 let path_key = PathKey::for_buffer(&buffer_handle, cx);
3280 self.set_merged_excerpt_ranges_for_path(
3281 path_key.clone(),
3282 buffer_handle,
3283 &buffer_snapshot,
3284 ranges,
3285 cx,
3286 );
3287 log::info!("Inserted with path_key: {:?}", path_key);
3288 } else {
3289 let path_key = self
3290 .snapshot
3291 .borrow()
3292 .buffers
3293 .get(&buffer_ids.choose(rng).unwrap())
3294 .unwrap()
3295 .path_key
3296 .clone();
3297 log::info!("Removing excerpts {:?}", path_key);
3298 self.remove_excerpts(path_key, cx);
3299 }
3300 }
3301 }
3302
3303 pub fn randomly_mutate(
3304 &mut self,
3305 rng: &mut impl rand::Rng,
3306 mutation_count: usize,
3307 cx: &mut Context<Self>,
3308 ) {
3309 use rand::prelude::*;
3310
3311 if rng.random_bool(0.7) || self.singleton {
3312 let buffer = self
3313 .buffers
3314 .values()
3315 .choose(rng)
3316 .map(|state| state.buffer.clone());
3317
3318 if let Some(buffer) = buffer {
3319 buffer.update(cx, |buffer, cx| {
3320 if rng.random() {
3321 buffer.randomly_edit(rng, mutation_count, cx);
3322 } else {
3323 buffer.randomly_undo_redo(rng, cx);
3324 }
3325 });
3326 } else {
3327 self.randomly_edit(rng, mutation_count, cx);
3328 }
3329 } else {
3330 self.randomly_edit_excerpts(rng, mutation_count, cx);
3331 }
3332
3333 self.check_invariants(cx);
3334 }
3335
3336 fn check_invariants(&self, cx: &App) {
3337 self.read(cx).check_invariants();
3338 }
3339}
3340
3341impl EventEmitter<Event> for MultiBuffer {}
3342
3343impl MultiBufferSnapshot {
3344 pub fn text(&self) -> String {
3345 self.chunks(
3346 MultiBufferOffset::ZERO..self.len(),
3347 LanguageAwareStyling {
3348 tree_sitter: false,
3349 diagnostics: false,
3350 },
3351 )
3352 .map(|chunk| chunk.text)
3353 .collect()
3354 }
3355
3356 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3357 self.reversed_chunks_in_range(MultiBufferOffset::ZERO..position.to_offset(self))
3358 .flat_map(|c| c.chars().rev())
3359 }
3360
3361 fn reversed_chunks_in_range(
3362 &self,
3363 range: Range<MultiBufferOffset>,
3364 ) -> ReversedMultiBufferChunks<'_> {
3365 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3366 cursor.seek(&range.end);
3367 let current_chunks = cursor.region().as_ref().map(|region| {
3368 let start_overshoot = range.start.saturating_sub(region.range.start);
3369 let end_overshoot = range.end - region.range.start;
3370 let end = (region.buffer_range.start + end_overshoot).min(region.buffer_range.end);
3371 let start = region.buffer_range.start + start_overshoot;
3372 region.buffer.reversed_chunks_in_range(start..end)
3373 });
3374 ReversedMultiBufferChunks {
3375 cursor,
3376 current_chunks,
3377 start: range.start,
3378 offset: range.end,
3379 }
3380 }
3381
3382 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3383 let offset = position.to_offset(self);
3384 self.text_for_range(offset..self.len())
3385 .flat_map(|chunk| chunk.chars())
3386 }
3387
3388 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
3389 self.chunks(
3390 range,
3391 LanguageAwareStyling {
3392 tree_sitter: false,
3393 diagnostics: false,
3394 },
3395 )
3396 .map(|chunk| chunk.text)
3397 }
3398
3399 pub fn is_line_blank(&self, row: MultiBufferRow) -> bool {
3400 self.text_for_range(Point::new(row.0, 0)..Point::new(row.0, self.line_len(row)))
3401 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
3402 }
3403
3404 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
3405 where
3406 T: ToOffset,
3407 {
3408 let position = position.to_offset(self);
3409 position == self.clip_offset(position, Bias::Left)
3410 && self
3411 .bytes_in_range(position..self.len())
3412 .flatten()
3413 .copied()
3414 .take(needle.len())
3415 .eq(needle.bytes())
3416 }
3417
3418 pub fn diff_hunks(&self) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3419 self.diff_hunks_in_range(Anchor::Min..Anchor::Max)
3420 }
3421
3422 pub fn diff_hunks_in_range<T: ToPoint>(
3423 &self,
3424 range: Range<T>,
3425 ) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3426 let query_range = range.start.to_point(self)..range.end.to_point(self);
3427 self.lift_buffer_metadata(query_range.clone(), move |buffer, buffer_range| {
3428 let diff = self.diff_state(buffer.remote_id())?;
3429 let iter = if let Some(main_buffer) = &diff.main_buffer {
3430 let buffer_start = buffer.point_to_offset(buffer_range.start);
3431 let buffer_end = buffer.point_to_offset(buffer_range.end);
3432 itertools::Either::Left(
3433 diff.hunks_intersecting_base_text_range(buffer_start..buffer_end, main_buffer)
3434 .map(move |hunk| (hunk, buffer, true)),
3435 )
3436 } else {
3437 let buffer_start = buffer.anchor_before(buffer_range.start);
3438 let buffer_end = buffer.anchor_after(buffer_range.end);
3439 itertools::Either::Right(
3440 diff.hunks_intersecting_range(buffer_start..buffer_end, buffer)
3441 .map(move |hunk| (hunk, buffer, false)),
3442 )
3443 };
3444 Some(iter.filter_map(|(hunk, buffer, is_inverted)| {
3445 if hunk.is_created_file() && !self.all_diff_hunks_expanded {
3446 return None;
3447 }
3448 let range = if is_inverted {
3449 hunk.diff_base_byte_range.to_point(&buffer)
3450 } else {
3451 hunk.range.clone()
3452 };
3453 Some((range, (hunk, is_inverted)))
3454 }))
3455 })
3456 .filter_map(move |(range, (hunk, is_inverted), excerpt)| {
3457 let buffer_snapshot = excerpt.buffer_snapshot(self);
3458 if range.start != range.end && range.end == query_range.start && !hunk.range.is_empty()
3459 {
3460 return None;
3461 }
3462 let end_row = if range.end.column == 0 {
3463 range.end.row
3464 } else {
3465 range.end.row + 1
3466 };
3467
3468 let word_diffs =
3469 (!hunk.base_word_diffs.is_empty() || !hunk.buffer_word_diffs.is_empty())
3470 .then(|| {
3471 let mut word_diffs = Vec::new();
3472
3473 if self.show_deleted_hunks || is_inverted {
3474 let hunk_start_offset = if is_inverted {
3475 Anchor::in_buffer(
3476 excerpt.path_key_index,
3477 buffer_snapshot.anchor_after(hunk.diff_base_byte_range.start),
3478 )
3479 .to_offset(self)
3480 } else {
3481 Anchor::in_buffer(excerpt.path_key_index, hunk.buffer_range.start)
3482 .to_offset(self)
3483 };
3484
3485 word_diffs.extend(hunk.base_word_diffs.iter().map(|diff| {
3486 hunk_start_offset + diff.start..hunk_start_offset + diff.end
3487 }));
3488 }
3489
3490 if !is_inverted {
3491 word_diffs.extend(hunk.buffer_word_diffs.into_iter().map(|diff| {
3492 Anchor::range_in_buffer(excerpt.path_key_index, diff)
3493 .to_offset(self)
3494 }));
3495 }
3496 word_diffs
3497 })
3498 .unwrap_or_default();
3499
3500 let buffer_range = if is_inverted {
3501 buffer_snapshot.anchor_after(hunk.diff_base_byte_range.start)
3502 ..buffer_snapshot.anchor_before(hunk.diff_base_byte_range.end)
3503 } else {
3504 hunk.buffer_range.clone()
3505 };
3506 let status_kind = if hunk.buffer_range.start == hunk.buffer_range.end {
3507 DiffHunkStatusKind::Deleted
3508 } else if hunk.diff_base_byte_range.is_empty() {
3509 DiffHunkStatusKind::Added
3510 } else {
3511 DiffHunkStatusKind::Modified
3512 };
3513 let multi_buffer_range =
3514 Anchor::range_in_buffer(excerpt.path_key_index, buffer_range.clone());
3515 Some(MultiBufferDiffHunk {
3516 row_range: MultiBufferRow(range.start.row)..MultiBufferRow(end_row),
3517 buffer_id: buffer_snapshot.remote_id(),
3518 buffer_range,
3519 word_diffs,
3520 diff_base_byte_range: BufferOffset(hunk.diff_base_byte_range.start)
3521 ..BufferOffset(hunk.diff_base_byte_range.end),
3522 status: DiffHunkStatus {
3523 kind: status_kind,
3524 secondary: hunk.secondary_status,
3525 },
3526 excerpt_range: excerpt.range.clone(),
3527 multi_buffer_range,
3528 })
3529 })
3530 }
3531
3532 fn excerpts_for_range<T: ToOffset>(
3533 &self,
3534 range: Range<T>,
3535 ) -> impl Iterator<Item = &Excerpt> + '_ {
3536 let range = range.start.to_offset(self)..range.end.to_offset(self);
3537 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3538 cursor.seek(&range.start);
3539 std::iter::from_fn(move || {
3540 let region = cursor.region()?;
3541 if region.range.start > range.end
3542 || region.range.start == range.end && region.range.start > range.start
3543 {
3544 return None;
3545 }
3546 let excerpt = region.excerpt;
3547 cursor.next_excerpt_forwards();
3548 Some(excerpt)
3549 })
3550 }
3551
3552 pub fn buffer_ids_for_range<T: ToOffset>(
3553 &self,
3554 range: Range<T>,
3555 ) -> impl Iterator<Item = BufferId> + '_ {
3556 self.excerpts_for_range(range)
3557 .map(|excerpt| excerpt.buffer_snapshot(self).remote_id())
3558 }
3559
3560 /// Resolves the given [`text::Anchor`]s to [`crate::Anchor`]s if the anchor is within a visible excerpt.
3561 ///
3562 /// The passed in anchors must be ordered.
3563 pub fn text_anchors_to_visible_anchors(
3564 &self,
3565 anchors: impl IntoIterator<Item = text::Anchor>,
3566 ) -> Vec<Option<Anchor>> {
3567 let anchors = anchors.into_iter();
3568 let mut result = Vec::with_capacity(anchors.size_hint().0);
3569 let mut anchors = anchors.peekable();
3570 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
3571 'anchors: while let Some(anchor) = anchors.peek() {
3572 let buffer_id = anchor.buffer_id;
3573 let mut same_buffer_anchors = anchors.peeking_take_while(|a| a.buffer_id == buffer_id);
3574
3575 if let Some(buffer) = self.buffers.get(&buffer_id) {
3576 let path = &buffer.path_key;
3577 let Some(mut next) = same_buffer_anchors.next() else {
3578 continue 'anchors;
3579 };
3580 cursor.seek_forward(path, Bias::Left);
3581 'excerpts: loop {
3582 let Some(excerpt) = cursor.item() else {
3583 break;
3584 };
3585 if &excerpt.path_key != path {
3586 break;
3587 }
3588 let buffer_snapshot = excerpt.buffer_snapshot(self);
3589
3590 loop {
3591 // anchor is before the first excerpt
3592 if excerpt
3593 .range
3594 .context
3595 .start
3596 .cmp(&next, &buffer_snapshot)
3597 .is_gt()
3598 {
3599 // so we skip it and try the next anchor
3600 result.push(None);
3601 match same_buffer_anchors.next() {
3602 Some(anchor) => next = anchor,
3603 None => continue 'anchors,
3604 }
3605 // anchor is within the excerpt
3606 } else if excerpt
3607 .range
3608 .context
3609 .end
3610 .cmp(&next, &buffer_snapshot)
3611 .is_ge()
3612 {
3613 // record it and all following anchors that are within
3614 result.push(Some(Anchor::in_buffer(excerpt.path_key_index, next)));
3615 result.extend(
3616 same_buffer_anchors
3617 .peeking_take_while(|a| {
3618 excerpt.range.context.end.cmp(a, &buffer_snapshot).is_ge()
3619 })
3620 .map(|a| Some(Anchor::in_buffer(excerpt.path_key_index, a))),
3621 );
3622 match same_buffer_anchors.next() {
3623 Some(anchor) => next = anchor,
3624 None => continue 'anchors,
3625 }
3626 // anchor is after the excerpt, try the next one
3627 } else {
3628 cursor.next();
3629 continue 'excerpts;
3630 }
3631 }
3632 }
3633 // account for `next`
3634 result.push(None);
3635 }
3636 result.extend(same_buffer_anchors.map(|_| None));
3637 }
3638
3639 result
3640 }
3641
3642 pub fn range_to_buffer_ranges<T: ToOffset>(
3643 &self,
3644 range: Range<T>,
3645 ) -> Vec<(
3646 BufferSnapshot,
3647 Range<BufferOffset>,
3648 ExcerptRange<text::Anchor>,
3649 )> {
3650 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3651 let start = range.start.to_offset(self);
3652 let end = range.end.to_offset(self);
3653 cursor.seek(&start);
3654
3655 let mut result: Vec<(
3656 BufferSnapshot,
3657 Range<BufferOffset>,
3658 ExcerptRange<text::Anchor>,
3659 )> = Vec::new();
3660 while let Some(region) = cursor.region() {
3661 if region.range.start >= end {
3662 break;
3663 }
3664 if region.is_main_buffer {
3665 let start_overshoot = start.saturating_sub(region.range.start);
3666 let end_offset = end;
3667 let end_overshoot = end_offset.saturating_sub(region.range.start);
3668 let start = region
3669 .buffer_range
3670 .end
3671 .min(region.buffer_range.start + start_overshoot);
3672 let end = region
3673 .buffer_range
3674 .end
3675 .min(region.buffer_range.start + end_overshoot);
3676 let excerpt_range = region.excerpt.range.clone();
3677 if let Some(prev) =
3678 result
3679 .last_mut()
3680 .filter(|(prev_buffer, prev_range, prev_excerpt)| {
3681 prev_buffer.remote_id() == region.buffer.remote_id()
3682 && prev_range.end == start
3683 && prev_excerpt.context.start == excerpt_range.context.start
3684 })
3685 {
3686 prev.1.end = end;
3687 } else {
3688 result.push((region.buffer.clone(), start..end, excerpt_range));
3689 }
3690 }
3691 cursor.next();
3692 }
3693
3694 if let Some(excerpt) = cursor.excerpt()
3695 && excerpt.text_summary.len == 0
3696 && end == self.len()
3697 {
3698 let buffer_snapshot = excerpt.buffer_snapshot(self);
3699
3700 let buffer_offset =
3701 BufferOffset(excerpt.range.context.start.to_offset(buffer_snapshot));
3702 let excerpt_range = excerpt.range.clone();
3703 if result
3704 .last_mut()
3705 .is_none_or(|(prev_buffer, prev_range, prev_excerpt)| {
3706 prev_buffer.remote_id() != buffer_snapshot.remote_id()
3707 || prev_range.end != buffer_offset
3708 || prev_excerpt.context.start != excerpt_range.context.start
3709 })
3710 {
3711 result.push((
3712 buffer_snapshot.clone(),
3713 buffer_offset..buffer_offset,
3714 excerpt_range,
3715 ));
3716 }
3717 }
3718
3719 result
3720 }
3721
3722 pub fn range_to_buffer_ranges_with_deleted_hunks<T: ToOffset>(
3723 &self,
3724 range: Range<T>,
3725 ) -> impl Iterator<Item = (&BufferSnapshot, Range<BufferOffset>, Option<Anchor>)> + '_ {
3726 let start = range.start.to_offset(self);
3727 let end = range.end.to_offset(self);
3728
3729 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3730 cursor.seek(&start);
3731
3732 std::iter::from_fn(move || {
3733 let region = cursor.region()?;
3734 if region.range.start > end {
3735 return None;
3736 }
3737 let start_overshoot = start.saturating_sub(region.range.start);
3738 let end_overshoot = end.saturating_sub(region.range.start);
3739 let start = region
3740 .buffer_range
3741 .end
3742 .min(region.buffer_range.start + start_overshoot);
3743 let end = region
3744 .buffer_range
3745 .end
3746 .min(region.buffer_range.start + end_overshoot);
3747
3748 let deleted_hunk_anchor = if region.is_main_buffer {
3749 None
3750 } else {
3751 Some(self.anchor_before(region.range.start))
3752 };
3753 let result = (region.buffer, start..end, deleted_hunk_anchor);
3754 cursor.next();
3755 Some(result)
3756 })
3757 }
3758
3759 /// Retrieves buffer metadata for the given range, and converts it into multi-buffer
3760 /// coordinates.
3761 ///
3762 /// The given callback will be called for every excerpt intersecting the given range. It will
3763 /// be passed the excerpt's buffer and the buffer range that the input range intersects.
3764 /// The callback should return an iterator of metadata items from that buffer, each paired
3765 /// with a buffer range.
3766 ///
3767 /// The returned iterator yields each of these metadata items, paired with its range in
3768 /// multi-buffer coordinates.
3769 fn lift_buffer_metadata<'a, MBD, M, I>(
3770 &'a self,
3771 query_range: Range<MBD>,
3772 get_buffer_metadata: impl 'a + Fn(&'a BufferSnapshot, Range<MBD::TextDimension>) -> Option<I>,
3773 ) -> impl Iterator<Item = (Range<MBD>, M, &'a Excerpt)> + 'a
3774 where
3775 I: Iterator<Item = (Range<MBD::TextDimension>, M)> + 'a,
3776 MBD: MultiBufferDimension
3777 + Ord
3778 + Sub<Output = MBD::TextDimension>
3779 + ops::Add<MBD::TextDimension, Output = MBD>
3780 + ops::AddAssign<MBD::TextDimension>,
3781 MBD::TextDimension: Sub<Output = MBD::TextDimension>
3782 + ops::Add<Output = MBD::TextDimension>
3783 + AddAssign<MBD::TextDimension>
3784 + Ord,
3785 {
3786 let mut current_excerpt_metadata: Option<(ExcerptRange<text::Anchor>, I)> = None;
3787 let mut cursor = self.cursor::<MBD, MBD::TextDimension>();
3788
3789 // Find the excerpt and buffer offset where the given range ends.
3790 cursor.seek(&query_range.end);
3791 let mut range_end = None;
3792 while let Some(region) = cursor.region() {
3793 if region.is_main_buffer {
3794 let mut buffer_end = region.buffer_range.start;
3795 let overshoot = if query_range.end > region.range.start {
3796 query_range.end - region.range.start
3797 } else {
3798 <MBD::TextDimension>::default()
3799 };
3800 buffer_end = buffer_end + overshoot;
3801 range_end = Some((region.excerpt.range.clone(), buffer_end));
3802 break;
3803 }
3804 cursor.next();
3805 }
3806
3807 cursor.seek(&query_range.start);
3808
3809 if let Some(region) = cursor.region().filter(|region| !region.is_main_buffer)
3810 && region.range.start > MBD::default()
3811 {
3812 cursor.prev()
3813 } else if let Some(region) = cursor.region()
3814 && region.is_main_buffer
3815 && region.diff_hunk_status.is_some()
3816 {
3817 cursor.prev();
3818 if cursor.region().is_none_or(|region| region.is_main_buffer) {
3819 cursor.next();
3820 }
3821 }
3822
3823 iter::from_fn(move || {
3824 loop {
3825 let excerpt = cursor.excerpt()?;
3826 let buffer_snapshot = excerpt.buffer_snapshot(self);
3827
3828 // If we have already retrieved metadata for this excerpt, continue to use it.
3829 let metadata_iter = if let Some((_, metadata)) = current_excerpt_metadata
3830 .as_mut()
3831 .filter(|(excerpt_info, _)| excerpt_info == &excerpt.range)
3832 {
3833 Some(metadata)
3834 }
3835 // Otherwise, compute the intersection of the input range with the excerpt's range,
3836 // and retrieve the metadata for the resulting range.
3837 else {
3838 let region = cursor.region()?;
3839 let mut buffer_start;
3840 if region.is_main_buffer {
3841 buffer_start = region.buffer_range.start;
3842 if query_range.start > region.range.start {
3843 let overshoot = query_range.start - region.range.start;
3844 buffer_start = buffer_start + overshoot;
3845 }
3846 buffer_start = buffer_start.min(region.buffer_range.end);
3847 } else {
3848 buffer_start = cursor.main_buffer_position()?;
3849 };
3850 let mut buffer_end = excerpt
3851 .range
3852 .context
3853 .end
3854 .summary::<MBD::TextDimension>(&buffer_snapshot);
3855 if let Some((end_excerpt, end_buffer_offset)) = &range_end
3856 && &excerpt.range == end_excerpt
3857 {
3858 buffer_end = buffer_end.min(*end_buffer_offset);
3859 }
3860
3861 get_buffer_metadata(&buffer_snapshot, buffer_start..buffer_end).map(
3862 |iterator| {
3863 &mut current_excerpt_metadata
3864 .insert((excerpt.range.clone(), iterator))
3865 .1
3866 },
3867 )
3868 };
3869
3870 // Visit each metadata item.
3871 if let Some((metadata_buffer_range, metadata)) =
3872 metadata_iter.and_then(Iterator::next)
3873 {
3874 // Find the multibuffer regions that contain the start and end of
3875 // the metadata item's range.
3876 if metadata_buffer_range.start > <MBD::TextDimension>::default() {
3877 while let Some(region) = cursor.region() {
3878 if (region.is_main_buffer
3879 && (region.buffer_range.end >= metadata_buffer_range.start
3880 || cursor.is_at_end_of_excerpt()))
3881 || (!region.is_main_buffer
3882 && region.buffer_range.start == metadata_buffer_range.start)
3883 {
3884 break;
3885 }
3886 cursor.next();
3887 }
3888 }
3889 let start_region = cursor.region()?.clone();
3890 while let Some(region) = cursor.region() {
3891 if region.is_main_buffer
3892 && (region.buffer_range.end > metadata_buffer_range.end
3893 || cursor.is_at_end_of_excerpt())
3894 {
3895 break;
3896 }
3897 cursor.next();
3898 }
3899 let end_region = cursor.region();
3900
3901 // Convert the metadata item's range into multibuffer coordinates.
3902 let mut start_position = start_region.range.start;
3903 let region_buffer_start = start_region.buffer_range.start;
3904 if start_region.is_main_buffer
3905 && metadata_buffer_range.start > region_buffer_start
3906 {
3907 start_position =
3908 start_position + (metadata_buffer_range.start - region_buffer_start);
3909 start_position = start_position.min(start_region.range.end);
3910 }
3911
3912 let mut end_position = self.max_position();
3913 if let Some(end_region) = &end_region {
3914 end_position = end_region.range.start;
3915 debug_assert!(end_region.is_main_buffer);
3916 let region_buffer_start = end_region.buffer_range.start;
3917 if metadata_buffer_range.end > region_buffer_start {
3918 end_position =
3919 end_position + (metadata_buffer_range.end - region_buffer_start);
3920 }
3921 end_position = end_position.min(end_region.range.end);
3922 }
3923
3924 if start_position <= query_range.end && end_position >= query_range.start {
3925 return Some((start_position..end_position, metadata, excerpt));
3926 }
3927 }
3928 // When there are no more metadata items for this excerpt, move to the next excerpt.
3929 else {
3930 current_excerpt_metadata.take();
3931 if let Some((end_excerpt, _)) = &range_end
3932 && &excerpt.range == end_excerpt
3933 {
3934 return None;
3935 }
3936 cursor.next_excerpt_forwards();
3937 }
3938 }
3939 })
3940 }
3941
3942 pub fn diff_hunk_before<T: ToOffset>(&self, position: T) -> Option<MultiBufferRow> {
3943 let offset = position.to_offset(self);
3944
3945 let mut cursor = self
3946 .cursor::<DimensionPair<MultiBufferOffset, Point>, DimensionPair<BufferOffset, Point>>(
3947 );
3948 cursor.seek(&DimensionPair {
3949 key: offset,
3950 value: None,
3951 });
3952 cursor.seek_to_start_of_current_excerpt();
3953 let excerpt = cursor.excerpt()?;
3954
3955 let buffer = excerpt.buffer_snapshot(self);
3956 let excerpt_start = excerpt.range.context.start.to_offset(buffer);
3957 let excerpt_end = excerpt.range.context.end.to_offset(buffer);
3958 let current_position = match self.anchor_before(offset) {
3959 Anchor::Min => 0,
3960 Anchor::Excerpt(excerpt_anchor) => excerpt_anchor.text_anchor().to_offset(buffer),
3961 Anchor::Max => unreachable!(),
3962 };
3963
3964 if let Some(diff) = self.diff_state(excerpt.buffer_id) {
3965 if let Some(main_buffer) = &diff.main_buffer {
3966 for hunk in diff
3967 .hunks_intersecting_base_text_range_rev(excerpt_start..excerpt_end, main_buffer)
3968 {
3969 if hunk.diff_base_byte_range.end >= current_position {
3970 continue;
3971 }
3972 let hunk_start = buffer.anchor_after(hunk.diff_base_byte_range.start);
3973 let start =
3974 Anchor::in_buffer(excerpt.path_key_index, hunk_start).to_point(self);
3975 return Some(MultiBufferRow(start.row));
3976 }
3977 } else {
3978 let excerpt_end = buffer.anchor_before(excerpt_end.min(current_position));
3979 for hunk in diff
3980 .hunks_intersecting_range_rev(excerpt.range.context.start..excerpt_end, buffer)
3981 {
3982 let hunk_end = hunk.buffer_range.end.to_offset(buffer);
3983 if hunk_end >= current_position {
3984 continue;
3985 }
3986 let start = Anchor::in_buffer(excerpt.path_key_index, hunk.buffer_range.start)
3987 .to_point(self);
3988 return Some(MultiBufferRow(start.row));
3989 }
3990 }
3991 }
3992
3993 loop {
3994 cursor.prev_excerpt();
3995 let excerpt = cursor.excerpt()?;
3996 let buffer = excerpt.buffer_snapshot(self);
3997
3998 let Some(diff) = self.diff_state(excerpt.buffer_id) else {
3999 continue;
4000 };
4001 if let Some(main_buffer) = &diff.main_buffer {
4002 let Some(hunk) = diff
4003 .hunks_intersecting_base_text_range_rev(
4004 excerpt.range.context.to_offset(buffer),
4005 main_buffer,
4006 )
4007 .next()
4008 else {
4009 continue;
4010 };
4011 let hunk_start = buffer.anchor_after(hunk.diff_base_byte_range.start);
4012 let start = Anchor::in_buffer(excerpt.path_key_index, hunk_start).to_point(self);
4013 return Some(MultiBufferRow(start.row));
4014 } else {
4015 let Some(hunk) = diff
4016 .hunks_intersecting_range_rev(excerpt.range.context.clone(), buffer)
4017 .next()
4018 else {
4019 continue;
4020 };
4021 let start = Anchor::in_buffer(excerpt.path_key_index, hunk.buffer_range.start)
4022 .to_point(self);
4023 return Some(MultiBufferRow(start.row));
4024 }
4025 }
4026 }
4027
4028 pub fn has_diff_hunks(&self) -> bool {
4029 self.diffs.iter().any(|diff| !diff.is_empty())
4030 }
4031
4032 pub fn is_inside_word<T: ToOffset>(
4033 &self,
4034 position: T,
4035 scope_context: Option<CharScopeContext>,
4036 ) -> bool {
4037 let position = position.to_offset(self);
4038 let classifier = self
4039 .char_classifier_at(position)
4040 .scope_context(scope_context);
4041 let next_char_kind = self.chars_at(position).next().map(|c| classifier.kind(c));
4042 let prev_char_kind = self
4043 .reversed_chars_at(position)
4044 .next()
4045 .map(|c| classifier.kind(c));
4046 prev_char_kind.zip(next_char_kind) == Some((CharKind::Word, CharKind::Word))
4047 }
4048
4049 pub fn surrounding_word<T: ToOffset>(
4050 &self,
4051 start: T,
4052 scope_context: Option<CharScopeContext>,
4053 ) -> (Range<MultiBufferOffset>, Option<CharKind>) {
4054 let mut start = start.to_offset(self);
4055 let mut end = start;
4056 let mut next_chars = self.chars_at(start).peekable();
4057 let mut prev_chars = self.reversed_chars_at(start).peekable();
4058
4059 let classifier = self.char_classifier_at(start).scope_context(scope_context);
4060
4061 let word_kind = cmp::max(
4062 prev_chars.peek().copied().map(|c| classifier.kind(c)),
4063 next_chars.peek().copied().map(|c| classifier.kind(c)),
4064 );
4065
4066 for ch in prev_chars {
4067 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4068 start -= ch.len_utf8();
4069 } else {
4070 break;
4071 }
4072 }
4073
4074 for ch in next_chars {
4075 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4076 end += ch.len_utf8();
4077 } else {
4078 break;
4079 }
4080 }
4081
4082 (start..end, word_kind)
4083 }
4084
4085 pub fn char_kind_before<T: ToOffset>(
4086 &self,
4087 start: T,
4088 scope_context: Option<CharScopeContext>,
4089 ) -> Option<CharKind> {
4090 let start = start.to_offset(self);
4091 let classifier = self.char_classifier_at(start).scope_context(scope_context);
4092 self.reversed_chars_at(start)
4093 .next()
4094 .map(|ch| classifier.kind(ch))
4095 }
4096
4097 pub fn all_buffer_ids(&self) -> impl Iterator<Item = BufferId> + '_ {
4098 self.buffers.iter().map(|(id, _)| *id)
4099 }
4100
4101 pub fn is_singleton(&self) -> bool {
4102 self.singleton
4103 }
4104
4105 pub fn as_singleton(&self) -> Option<&BufferSnapshot> {
4106 if self.is_singleton() {
4107 Some(self.excerpts.first()?.buffer_snapshot(&self))
4108 } else {
4109 None
4110 }
4111 }
4112
4113 pub fn len(&self) -> MultiBufferOffset {
4114 self.diff_transforms.summary().output.len
4115 }
4116
4117 pub fn max_position<MBD: MultiBufferDimension>(&self) -> MBD {
4118 MBD::from_summary(&self.text_summary())
4119 }
4120
4121 pub fn is_empty(&self) -> bool {
4122 self.diff_transforms.summary().output.len == MultiBufferOffset(0)
4123 }
4124
4125 pub fn widest_line_number(&self) -> u32 {
4126 // widest_line_number is 0-based, so 1 is added to get the displayed line number.
4127 self.excerpts.summary().widest_line_number + 1
4128 }
4129
4130 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes<'_> {
4131 let range = range.start.to_offset(self)..range.end.to_offset(self);
4132 let mut excerpts = self.cursor::<MultiBufferOffset, BufferOffset>();
4133 excerpts.seek(&range.start);
4134
4135 let mut chunk;
4136 let mut has_trailing_newline;
4137 let excerpt_bytes;
4138 if let Some(region) = excerpts.region() {
4139 let mut bytes = region.buffer.bytes_in_range(
4140 region.buffer_range.start + (range.start - region.range.start)
4141 ..(region.buffer_range.start + (range.end - region.range.start))
4142 .min(region.buffer_range.end),
4143 );
4144 chunk = bytes.next().unwrap_or(&[][..]);
4145 excerpt_bytes = Some(bytes);
4146 has_trailing_newline = region.has_trailing_newline && range.end >= region.range.end;
4147 if chunk.is_empty() && has_trailing_newline {
4148 chunk = b"\n";
4149 has_trailing_newline = false;
4150 }
4151 } else {
4152 chunk = &[][..];
4153 excerpt_bytes = None;
4154 has_trailing_newline = false;
4155 };
4156
4157 MultiBufferBytes {
4158 range,
4159 cursor: excerpts,
4160 excerpt_bytes,
4161 has_trailing_newline,
4162 chunk,
4163 }
4164 }
4165
4166 pub fn reversed_bytes_in_range<T: ToOffset>(
4167 &self,
4168 range: Range<T>,
4169 ) -> ReversedMultiBufferBytes<'_> {
4170 let range = range.start.to_offset(self)..range.end.to_offset(self);
4171 let mut chunks = self.reversed_chunks_in_range(range.clone());
4172 let chunk = chunks.next().map_or(&[][..], |c| c.as_bytes());
4173 ReversedMultiBufferBytes {
4174 range,
4175 chunks,
4176 chunk,
4177 }
4178 }
4179
4180 pub fn row_infos(&self, start_row: MultiBufferRow) -> MultiBufferRows<'_> {
4181 let mut cursor = self.cursor::<Point, Point>();
4182 cursor.seek(&Point::new(start_row.0, 0));
4183 let mut result = MultiBufferRows {
4184 point: Point::new(0, 0),
4185 is_empty: self.excerpts.is_empty(),
4186 is_singleton: self.is_singleton(),
4187 cursor,
4188 };
4189 result.seek(start_row);
4190 result
4191 }
4192
4193 pub fn chunks<T: ToOffset>(
4194 &self,
4195 range: Range<T>,
4196 language_aware: LanguageAwareStyling,
4197 ) -> MultiBufferChunks<'_> {
4198 let mut chunks = MultiBufferChunks {
4199 excerpt_offset_range: ExcerptDimension(MultiBufferOffset::ZERO)
4200 ..ExcerptDimension(MultiBufferOffset::ZERO),
4201 range: MultiBufferOffset::ZERO..MultiBufferOffset::ZERO,
4202 excerpts: self.excerpts.cursor(()),
4203 diff_transforms: self.diff_transforms.cursor(()),
4204 diff_base_chunks: None,
4205 excerpt_chunks: None,
4206 buffer_chunk: None,
4207 language_aware,
4208 snapshot: self,
4209 };
4210 let range = range.start.to_offset(self)..range.end.to_offset(self);
4211 chunks.seek(range);
4212 chunks
4213 }
4214
4215 pub fn clip_offset(&self, offset: MultiBufferOffset, bias: Bias) -> MultiBufferOffset {
4216 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset)
4217 }
4218
4219 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
4220 self.clip_dimension(point, bias, text::BufferSnapshot::clip_point)
4221 }
4222
4223 pub fn clip_offset_utf16(
4224 &self,
4225 offset: MultiBufferOffsetUtf16,
4226 bias: Bias,
4227 ) -> MultiBufferOffsetUtf16 {
4228 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset_utf16)
4229 }
4230
4231 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
4232 self.clip_dimension(point.0, bias, |buffer, point, bias| {
4233 buffer.clip_point_utf16(Unclipped(point), bias)
4234 })
4235 }
4236
4237 pub fn offset_to_point(&self, offset: MultiBufferOffset) -> Point {
4238 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point)
4239 }
4240
4241 pub fn offset_to_point_utf16(&self, offset: MultiBufferOffset) -> PointUtf16 {
4242 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point_utf16)
4243 }
4244
4245 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
4246 self.convert_dimension(point, text::BufferSnapshot::point_to_point_utf16)
4247 }
4248
4249 pub fn point_utf16_to_point(&self, point: PointUtf16) -> Point {
4250 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_point)
4251 }
4252
4253 #[instrument(skip_all)]
4254 pub fn point_to_offset(&self, point: Point) -> MultiBufferOffset {
4255 self.convert_dimension(point, text::BufferSnapshot::point_to_offset)
4256 }
4257
4258 pub fn point_to_offset_utf16(&self, point: Point) -> MultiBufferOffsetUtf16 {
4259 self.convert_dimension(point, text::BufferSnapshot::point_to_offset_utf16)
4260 }
4261
4262 pub fn offset_utf16_to_offset(&self, offset: MultiBufferOffsetUtf16) -> MultiBufferOffset {
4263 self.convert_dimension(offset, text::BufferSnapshot::offset_utf16_to_offset)
4264 }
4265
4266 pub fn offset_to_offset_utf16(&self, offset: MultiBufferOffset) -> MultiBufferOffsetUtf16 {
4267 self.convert_dimension(offset, text::BufferSnapshot::offset_to_offset_utf16)
4268 }
4269
4270 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> MultiBufferOffset {
4271 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_offset)
4272 }
4273
4274 pub fn point_utf16_to_offset_utf16(&self, point: PointUtf16) -> MultiBufferOffsetUtf16 {
4275 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_offset_utf16)
4276 }
4277
4278 fn clip_dimension<MBD, BD>(
4279 &self,
4280 position: MBD,
4281 bias: Bias,
4282 clip_buffer_position: fn(&text::BufferSnapshot, BD, Bias) -> BD,
4283 ) -> MBD
4284 where
4285 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
4286 BD: TextDimension + Sub<Output = <MBD as Sub>::Output> + AddAssign<<MBD as Sub>::Output>,
4287 {
4288 let mut cursor = self.cursor::<MBD, BD>();
4289 cursor.seek(&position);
4290 if let Some(region) = cursor.region() {
4291 if position >= region.range.end {
4292 return region.range.end;
4293 }
4294 let overshoot = position - region.range.start;
4295 let mut buffer_position = region.buffer_range.start;
4296 buffer_position += overshoot;
4297 let clipped_buffer_position =
4298 clip_buffer_position(region.buffer, buffer_position, bias);
4299 let mut position = region.range.start;
4300 position += clipped_buffer_position - region.buffer_range.start;
4301 position
4302 } else {
4303 self.max_position()
4304 }
4305 }
4306
4307 #[instrument(skip_all)]
4308 fn convert_dimension<MBR1, MBR2, BR1, BR2>(
4309 &self,
4310 key: MBR1,
4311 convert_buffer_dimension: fn(&text::BufferSnapshot, BR1) -> BR2,
4312 ) -> MBR2
4313 where
4314 MBR1: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBR1 as Sub>::Output>,
4315 BR1: TextDimension + Sub<Output = <MBR1 as Sub>::Output> + AddAssign<<MBR1 as Sub>::Output>,
4316 MBR2: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBR2 as Sub>::Output>,
4317 BR2: TextDimension + Sub<Output = <MBR2 as Sub>::Output> + AddAssign<<MBR2 as Sub>::Output>,
4318 {
4319 let mut cursor = self.cursor::<DimensionPair<MBR1, MBR2>, DimensionPair<BR1, BR2>>();
4320 cursor.seek(&DimensionPair { key, value: None });
4321 if let Some(region) = cursor.region() {
4322 if key >= region.range.end.key {
4323 return region.range.end.value.unwrap();
4324 }
4325 let start_key = region.range.start.key;
4326 let start_value = region.range.start.value.unwrap();
4327 let buffer_start_key = region.buffer_range.start.key;
4328 let buffer_start_value = region.buffer_range.start.value.unwrap();
4329 let mut buffer_key = buffer_start_key;
4330 buffer_key += key - start_key;
4331 let buffer_value = convert_buffer_dimension(region.buffer, buffer_key);
4332 let mut result = start_value;
4333 result += buffer_value - buffer_start_value;
4334 result
4335 } else {
4336 self.max_position()
4337 }
4338 }
4339
4340 pub fn point_to_buffer_offset<T: ToOffset>(
4341 &self,
4342 point: T,
4343 ) -> Option<(&BufferSnapshot, BufferOffset)> {
4344 let offset = point.to_offset(self);
4345 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
4346 cursor.seek(&offset);
4347 let region = cursor.region()?;
4348 let overshoot = offset - region.range.start;
4349 let buffer_offset = region.buffer_range.start + overshoot;
4350 if buffer_offset == BufferOffset(region.buffer.len() + 1)
4351 && region.has_trailing_newline
4352 && !region.is_main_buffer
4353 {
4354 let main_buffer_position = cursor.main_buffer_position()?;
4355 let buffer_snapshot = cursor.excerpt()?.buffer_snapshot(self);
4356 return Some((buffer_snapshot, main_buffer_position));
4357 } else if buffer_offset > BufferOffset(region.buffer.len()) {
4358 return None;
4359 }
4360 Some((region.buffer, buffer_offset))
4361 }
4362
4363 pub fn point_to_buffer_point(&self, point: Point) -> Option<(&BufferSnapshot, Point)> {
4364 let mut cursor = self.cursor::<Point, Point>();
4365 cursor.seek(&point);
4366 let region = cursor.region()?;
4367 let overshoot = point - region.range.start;
4368 let buffer_point = region.buffer_range.start + overshoot;
4369 let excerpt = cursor.excerpt()?;
4370 if buffer_point == region.buffer.max_point() + Point::new(1, 0)
4371 && region.has_trailing_newline
4372 && !region.is_main_buffer
4373 {
4374 return Some((
4375 &excerpt.buffer_snapshot(self),
4376 cursor.main_buffer_position()?,
4377 ));
4378 } else if buffer_point > region.buffer.max_point() {
4379 return None;
4380 }
4381 Some((region.buffer, buffer_point))
4382 }
4383
4384 pub fn suggested_indents(
4385 &self,
4386 rows: impl IntoIterator<Item = u32>,
4387 cx: &App,
4388 ) -> BTreeMap<MultiBufferRow, IndentSize> {
4389 let mut result = BTreeMap::new();
4390 self.suggested_indents_callback(
4391 rows,
4392 &mut |row, indent| {
4393 result.insert(row, indent);
4394 ControlFlow::Continue(())
4395 },
4396 cx,
4397 );
4398 result
4399 }
4400
4401 // move this to be a generator once those are a thing
4402 pub fn suggested_indents_callback(
4403 &self,
4404 rows: impl IntoIterator<Item = u32>,
4405 cb: &mut dyn FnMut(MultiBufferRow, IndentSize) -> ControlFlow<()>,
4406 cx: &App,
4407 ) {
4408 let mut rows_for_excerpt = Vec::new();
4409 let mut cursor = self.cursor::<Point, Point>();
4410 let mut rows = rows.into_iter().peekable();
4411 let mut prev_row = u32::MAX;
4412 let mut prev_language_indent_size = IndentSize::default();
4413
4414 while let Some(row) = rows.next() {
4415 cursor.seek(&Point::new(row, 0));
4416 let Some(region) = cursor.region() else {
4417 continue;
4418 };
4419
4420 // Retrieve the language and indent size once for each disjoint region being indented.
4421 let single_indent_size = if row.saturating_sub(1) == prev_row {
4422 prev_language_indent_size
4423 } else {
4424 region
4425 .buffer
4426 .language_indent_size_at(Point::new(row, 0), cx)
4427 };
4428 prev_language_indent_size = single_indent_size;
4429 prev_row = row;
4430
4431 let start_buffer_row = region.buffer_range.start.row;
4432 let start_multibuffer_row = region.range.start.row;
4433 let end_multibuffer_row = region.range.end.row;
4434
4435 rows_for_excerpt.push(row);
4436 while let Some(next_row) = rows.peek().copied() {
4437 if end_multibuffer_row > next_row {
4438 rows_for_excerpt.push(next_row);
4439 rows.next();
4440 } else {
4441 break;
4442 }
4443 }
4444
4445 let buffer_rows = rows_for_excerpt
4446 .drain(..)
4447 .map(|row| start_buffer_row + row - start_multibuffer_row);
4448 let buffer_indents = region
4449 .buffer
4450 .suggested_indents(buffer_rows, single_indent_size);
4451 for (row, indent) in buffer_indents {
4452 if cb(
4453 MultiBufferRow(start_multibuffer_row + row - start_buffer_row),
4454 indent,
4455 )
4456 .is_break()
4457 {
4458 return;
4459 }
4460 }
4461 }
4462 }
4463
4464 pub fn indent_size_for_line(&self, row: MultiBufferRow) -> IndentSize {
4465 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4466 let mut size = buffer.indent_size_for_line(range.start.row);
4467 size.len = size
4468 .len
4469 .min(range.end.column)
4470 .saturating_sub(range.start.column);
4471 size
4472 } else {
4473 IndentSize::spaces(0)
4474 }
4475 }
4476
4477 pub fn line_indent_for_row(&self, row: MultiBufferRow) -> LineIndent {
4478 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4479 LineIndent::from_iter(buffer.text_for_range(range).flat_map(|s| s.chars()))
4480 } else {
4481 LineIndent::spaces(0)
4482 }
4483 }
4484
4485 pub fn indent_and_comment_for_line(&self, row: MultiBufferRow, cx: &App) -> String {
4486 let mut indent = self.indent_size_for_line(row).chars().collect::<String>();
4487
4488 if self.language_settings(cx).extend_comment_on_newline
4489 && let Some(language_scope) = self.language_scope_at(Point::new(row.0, 0))
4490 {
4491 let delimiters = language_scope.line_comment_prefixes();
4492 for delimiter in delimiters {
4493 if *self
4494 .chars_at(Point::new(row.0, indent.len() as u32))
4495 .take(delimiter.chars().count())
4496 .collect::<String>()
4497 .as_str()
4498 == **delimiter
4499 {
4500 indent.push_str(delimiter);
4501 break;
4502 }
4503 }
4504 }
4505
4506 indent
4507 }
4508
4509 pub fn is_line_whitespace_upto<T>(&self, position: T) -> bool
4510 where
4511 T: ToOffset,
4512 {
4513 for char in self.reversed_chars_at(position) {
4514 if !char.is_whitespace() {
4515 return false;
4516 }
4517 if char == '\n' {
4518 return true;
4519 }
4520 }
4521 true
4522 }
4523
4524 pub fn prev_non_blank_row(&self, mut row: MultiBufferRow) -> Option<MultiBufferRow> {
4525 while row.0 > 0 {
4526 row.0 -= 1;
4527 if !self.is_line_blank(row) {
4528 return Some(row);
4529 }
4530 }
4531 None
4532 }
4533
4534 pub fn line_len(&self, row: MultiBufferRow) -> u32 {
4535 if let Some((_, range)) = self.buffer_line_for_row(row) {
4536 range.end.column - range.start.column
4537 } else {
4538 0
4539 }
4540 }
4541
4542 pub fn line_len_utf16(&self, row: MultiBufferRow) -> u32 {
4543 self.clip_point_utf16(Unclipped(PointUtf16::new(row.0, u32::MAX)), Bias::Left)
4544 .column
4545 }
4546
4547 pub fn buffer_line_for_row(
4548 &self,
4549 row: MultiBufferRow,
4550 ) -> Option<(&BufferSnapshot, Range<Point>)> {
4551 let mut cursor = self.cursor::<Point, Point>();
4552 let point = Point::new(row.0, 0);
4553 cursor.seek(&point);
4554 let region = cursor.region()?;
4555 let overshoot = point.min(region.range.end) - region.range.start;
4556 let buffer_point = region.buffer_range.start + overshoot;
4557 if buffer_point.row > region.buffer_range.end.row {
4558 return None;
4559 }
4560 let line_start = Point::new(buffer_point.row, 0).max(region.buffer_range.start);
4561 let line_end = Point::new(buffer_point.row, region.buffer.line_len(buffer_point.row))
4562 .min(region.buffer_range.end);
4563 Some((region.buffer, line_start..line_end))
4564 }
4565
4566 pub fn max_point(&self) -> Point {
4567 self.text_summary().lines
4568 }
4569
4570 pub fn max_row(&self) -> MultiBufferRow {
4571 MultiBufferRow(self.text_summary().lines.row)
4572 }
4573
4574 pub fn text_summary(&self) -> MBTextSummary {
4575 self.diff_transforms.summary().output
4576 }
4577
4578 pub fn text_summary_for_range<MBD, O>(&self, range: Range<O>) -> MBD
4579 where
4580 MBD: MultiBufferDimension + AddAssign,
4581 O: ToOffset,
4582 {
4583 let range = range.start.to_offset(self)..range.end.to_offset(self);
4584 let mut cursor = self
4585 .diff_transforms
4586 .cursor::<Dimensions<MultiBufferOffset, ExcerptOffset>>(());
4587 cursor.seek(&range.start, Bias::Right);
4588
4589 let Some(first_transform) = cursor.item() else {
4590 return MBD::from_summary(&MBTextSummary::default());
4591 };
4592
4593 let diff_transform_start = cursor.start().0;
4594 let diff_transform_end = cursor.end().0;
4595 let diff_start = range.start;
4596 let start_overshoot = diff_start - diff_transform_start;
4597 let end_overshoot = std::cmp::min(range.end, diff_transform_end) - diff_transform_start;
4598
4599 let mut result = match first_transform {
4600 DiffTransform::BufferContent { .. } => {
4601 let excerpt_start = cursor.start().1 + start_overshoot;
4602 let excerpt_end = cursor.start().1 + end_overshoot;
4603 self.text_summary_for_excerpt_offset_range(excerpt_start..excerpt_end)
4604 }
4605 DiffTransform::DeletedHunk {
4606 buffer_id,
4607 base_text_byte_range,
4608 has_trailing_newline,
4609 ..
4610 } => {
4611 let buffer_start = base_text_byte_range.start + start_overshoot;
4612 let mut buffer_end = base_text_byte_range.start + end_overshoot;
4613 let Some(base_text) = self.diff_state(*buffer_id).map(|diff| diff.base_text())
4614 else {
4615 panic!("{:?} is in non-existent deleted hunk", range.start)
4616 };
4617
4618 let include_trailing_newline =
4619 *has_trailing_newline && range.end >= diff_transform_end;
4620 if include_trailing_newline {
4621 buffer_end -= 1;
4622 }
4623
4624 let mut summary = base_text
4625 .text_summary_for_range::<MBD::TextDimension, _>(buffer_start..buffer_end);
4626
4627 if include_trailing_newline {
4628 summary.add_assign(&<MBD::TextDimension>::from_text_summary(
4629 &TextSummary::newline(),
4630 ))
4631 }
4632
4633 let mut result = MBD::default();
4634 result.add_text_dim(&summary);
4635 result
4636 }
4637 };
4638 if range.end < diff_transform_end {
4639 return result;
4640 }
4641
4642 cursor.next();
4643 result.add_mb_text_summary(
4644 &cursor
4645 .summary::<_, OutputDimension<_>>(&range.end, Bias::Right)
4646 .0,
4647 );
4648
4649 let Some(last_transform) = cursor.item() else {
4650 return result;
4651 };
4652
4653 let overshoot = range.end - cursor.start().0;
4654 let suffix = match last_transform {
4655 DiffTransform::BufferContent { .. } => {
4656 let end = cursor.start().1 + overshoot;
4657 self.text_summary_for_excerpt_offset_range::<MBD>(cursor.start().1..end)
4658 }
4659 DiffTransform::DeletedHunk {
4660 base_text_byte_range,
4661 buffer_id,
4662 has_trailing_newline,
4663 ..
4664 } => {
4665 let buffer_end = base_text_byte_range.start + overshoot;
4666 let Some(base_text) = self.diff_state(*buffer_id).map(|diff| diff.base_text())
4667 else {
4668 panic!("{:?} is in non-existent deleted hunk", range.end)
4669 };
4670
4671 let mut suffix = base_text.text_summary_for_range::<MBD::TextDimension, _>(
4672 base_text_byte_range.start..buffer_end,
4673 );
4674 if *has_trailing_newline && buffer_end == base_text_byte_range.end + 1 {
4675 suffix.add_assign(&<MBD::TextDimension>::from_text_summary(
4676 &TextSummary::from("\n"),
4677 ))
4678 }
4679
4680 let mut result = MBD::default();
4681 result.add_text_dim(&suffix);
4682 result
4683 }
4684 };
4685
4686 result += suffix;
4687 result
4688 }
4689
4690 fn text_summary_for_excerpt_offset_range<MBD>(&self, mut range: Range<ExcerptOffset>) -> MBD
4691 where
4692 MBD: MultiBufferDimension + AddAssign,
4693 {
4694 let mut summary = MBD::default();
4695 let mut cursor = self.excerpts.cursor::<ExcerptOffset>(());
4696 cursor.seek(&range.start, Bias::Right);
4697 if let Some(excerpt) = cursor.item() {
4698 let buffer_snapshot = excerpt.buffer_snapshot(self);
4699 let mut end_before_newline = cursor.end();
4700 if excerpt.has_trailing_newline {
4701 end_before_newline -= 1;
4702 }
4703
4704 let excerpt_start = excerpt.range.context.start.to_offset(&buffer_snapshot);
4705 let start_in_excerpt = excerpt_start + (range.start - *cursor.start());
4706 let end_in_excerpt =
4707 excerpt_start + (cmp::min(end_before_newline, range.end) - *cursor.start());
4708 summary.add_text_dim(
4709 &buffer_snapshot.text_summary_for_range::<MBD::TextDimension, _>(
4710 start_in_excerpt..end_in_excerpt,
4711 ),
4712 );
4713
4714 if range.end > end_before_newline {
4715 summary.add_mb_text_summary(&MBTextSummary::from(TextSummary::newline()));
4716 }
4717
4718 cursor.next();
4719 }
4720
4721 if range.end > *cursor.start() {
4722 summary += cursor
4723 .summary::<_, ExcerptDimension<MBD>>(&range.end, Bias::Right)
4724 .0;
4725 if let Some(excerpt) = cursor.item() {
4726 let buffer_snapshot = excerpt.buffer_snapshot(self);
4727 range.end = cmp::max(*cursor.start(), range.end);
4728
4729 let excerpt_start = excerpt.range.context.start.to_offset(&buffer_snapshot);
4730 let end_in_excerpt = excerpt_start + (range.end - *cursor.start());
4731 summary.add_text_dim(
4732 &buffer_snapshot.text_summary_for_range::<MBD::TextDimension, _>(
4733 excerpt_start..end_in_excerpt,
4734 ),
4735 );
4736 }
4737 }
4738
4739 summary
4740 }
4741
4742 pub fn summary_for_anchor<MBD>(&self, anchor: &Anchor) -> MBD
4743 where
4744 MBD: MultiBufferDimension
4745 + Ord
4746 + Sub<Output = MBD::TextDimension>
4747 + Sub<MBD::TextDimension, Output = MBD>
4748 + AddAssign<MBD::TextDimension>
4749 + Add<MBD::TextDimension, Output = MBD>,
4750 MBD::TextDimension: Sub<Output = MBD::TextDimension> + Ord,
4751 {
4752 let target = anchor.seek_target(self);
4753 let anchor = match anchor {
4754 Anchor::Min => {
4755 return MBD::default();
4756 }
4757 Anchor::Excerpt(excerpt_anchor) => excerpt_anchor,
4758 Anchor::Max => {
4759 return MBD::from_summary(&self.text_summary());
4760 }
4761 };
4762
4763 let (start, _, item) = self
4764 .excerpts
4765 .find::<ExcerptSummary, _>((), &target, Bias::Left);
4766 let start = MBD::from_summary(&start.text);
4767
4768 let excerpt_start_position = ExcerptDimension(start);
4769 if self.diff_transforms.is_empty() {
4770 if let Some(excerpt) = item {
4771 if !excerpt.contains(anchor, self) {
4772 return excerpt_start_position.0;
4773 }
4774 let buffer_snapshot = excerpt.buffer_snapshot(self);
4775 let excerpt_buffer_start = excerpt
4776 .range
4777 .context
4778 .start
4779 .summary::<MBD::TextDimension>(&buffer_snapshot);
4780 let excerpt_buffer_end = excerpt
4781 .range
4782 .context
4783 .end
4784 .summary::<MBD::TextDimension>(&buffer_snapshot);
4785 let buffer_summary = anchor
4786 .text_anchor()
4787 .summary::<MBD::TextDimension>(&buffer_snapshot);
4788 let summary = cmp::min(excerpt_buffer_end, buffer_summary);
4789 let mut position = excerpt_start_position;
4790 if summary > excerpt_buffer_start {
4791 position += summary - excerpt_buffer_start;
4792 }
4793
4794 position.0
4795 } else {
4796 excerpt_start_position.0
4797 }
4798 } else {
4799 let mut diff_transforms_cursor = self
4800 .diff_transforms
4801 .cursor::<Dimensions<ExcerptDimension<MBD>, OutputDimension<MBD>>>(());
4802
4803 if let Some(excerpt) = item {
4804 if !excerpt.contains(anchor, self) {
4805 diff_transforms_cursor.seek(&excerpt_start_position, Bias::Left);
4806 return self.summary_for_excerpt_position_without_hunks(
4807 Bias::Left,
4808 excerpt_start_position,
4809 &mut diff_transforms_cursor,
4810 );
4811 }
4812 let buffer_snapshot = excerpt.buffer_snapshot(self);
4813 let excerpt_buffer_start = excerpt
4814 .range
4815 .context
4816 .start
4817 .summary::<MBD::TextDimension>(&buffer_snapshot);
4818 let excerpt_buffer_end = excerpt
4819 .range
4820 .context
4821 .end
4822 .summary::<MBD::TextDimension>(&buffer_snapshot);
4823 let buffer_summary = anchor
4824 .text_anchor()
4825 .summary::<MBD::TextDimension>(&buffer_snapshot);
4826 let summary = cmp::min(excerpt_buffer_end, buffer_summary);
4827 let mut position = excerpt_start_position;
4828 if summary > excerpt_buffer_start {
4829 position += summary - excerpt_buffer_start;
4830 }
4831
4832 diff_transforms_cursor.seek(&position, Bias::Left);
4833 self.summary_for_anchor_with_excerpt_position(
4834 *anchor,
4835 position,
4836 &mut diff_transforms_cursor,
4837 &buffer_snapshot,
4838 )
4839 } else {
4840 diff_transforms_cursor.seek(&excerpt_start_position, Bias::Left);
4841 self.summary_for_excerpt_position_without_hunks(
4842 Bias::Right,
4843 excerpt_start_position,
4844 &mut diff_transforms_cursor,
4845 )
4846 }
4847 }
4848 }
4849
4850 /// Maps an anchor's excerpt-space position to its output-space position by
4851 /// walking the diff transforms. The cursor is shared across consecutive
4852 /// calls, so it may already be partway through the transform list.
4853 fn summary_for_anchor_with_excerpt_position<MBD>(
4854 &self,
4855 anchor: ExcerptAnchor,
4856 excerpt_position: ExcerptDimension<MBD>,
4857 diff_transforms: &mut Cursor<
4858 DiffTransform,
4859 Dimensions<ExcerptDimension<MBD>, OutputDimension<MBD>>,
4860 >,
4861 excerpt_buffer: &text::BufferSnapshot,
4862 ) -> MBD
4863 where
4864 MBD: MultiBufferDimension + Ord + Sub + AddAssign<<MBD as Sub>::Output>,
4865 {
4866 loop {
4867 let transform_end_position = diff_transforms.end().0;
4868 let item = diff_transforms.item();
4869 let at_transform_end = transform_end_position == excerpt_position && item.is_some();
4870
4871 // A right-biased anchor at a transform boundary belongs to the
4872 // *next* transform, so advance past the current one.
4873 if anchor.text_anchor.bias == Bias::Right && at_transform_end {
4874 diff_transforms.next();
4875 continue;
4876 }
4877
4878 let mut position = diff_transforms.start().1;
4879 match item {
4880 Some(DiffTransform::DeletedHunk {
4881 buffer_id,
4882 base_text_byte_range,
4883 hunk_info,
4884 ..
4885 }) => {
4886 if let Some(diff_base_anchor) = anchor.diff_base_anchor
4887 && let Some(base_text) =
4888 self.diff_state(*buffer_id).map(|diff| diff.base_text())
4889 && diff_base_anchor.is_valid(&base_text)
4890 {
4891 // The anchor carries a diff-base position — resolve it
4892 // to a location inside the deleted hunk.
4893 let base_text_offset = diff_base_anchor.to_offset(base_text);
4894 if base_text_offset >= base_text_byte_range.start
4895 && base_text_offset <= base_text_byte_range.end
4896 {
4897 let position_in_hunk = base_text
4898 .text_summary_for_range::<MBD::TextDimension, _>(
4899 base_text_byte_range.start..base_text_offset,
4900 );
4901 position.0.add_text_dim(&position_in_hunk);
4902 } else if at_transform_end {
4903 // diff_base offset falls outside this hunk's range;
4904 // advance to see if the next transform is a better fit.
4905 diff_transforms.next();
4906 continue;
4907 }
4908 } else if at_transform_end
4909 && anchor
4910 .text_anchor()
4911 .cmp(&hunk_info.hunk_start_anchor, excerpt_buffer)
4912 .is_gt()
4913 {
4914 // The anchor has no (valid) diff-base position, so it
4915 // belongs in the buffer content, not in the deleted
4916 // hunk. However, after an edit deletes the text between
4917 // the hunk boundary and this anchor, both resolve to
4918 // the same excerpt_position—landing us here on the
4919 // DeletedHunk left behind by the shared cursor. Use the
4920 // CRDT ordering to detect that the anchor is strictly
4921 // *past* the hunk boundary and skip to the following
4922 // BufferContent.
4923 diff_transforms.next();
4924 continue;
4925 }
4926 }
4927 _ => {
4928 // On a BufferContent (or no transform). If the anchor
4929 // carries a diff_base_anchor it needs a DeletedHunk, so
4930 // advance to find one.
4931 if at_transform_end && anchor.diff_base_anchor.is_some() {
4932 diff_transforms.next();
4933 continue;
4934 }
4935 let overshoot = excerpt_position - diff_transforms.start().0;
4936 position += overshoot;
4937 }
4938 }
4939
4940 return position.0;
4941 }
4942 }
4943
4944 /// Like `resolve_summary_for_anchor` but optimized for min/max anchors.
4945 fn summary_for_excerpt_position_without_hunks<MBD>(
4946 &self,
4947 bias: Bias,
4948 excerpt_position: ExcerptDimension<MBD>,
4949 diff_transforms: &mut Cursor<
4950 DiffTransform,
4951 Dimensions<ExcerptDimension<MBD>, OutputDimension<MBD>>,
4952 >,
4953 ) -> MBD
4954 where
4955 MBD: MultiBufferDimension + Ord + Sub + AddAssign<<MBD as Sub>::Output>,
4956 {
4957 loop {
4958 let transform_end_position = diff_transforms.end().0;
4959 let item = diff_transforms.item();
4960 let at_transform_end = transform_end_position == excerpt_position && item.is_some();
4961
4962 // A right-biased anchor at a transform boundary belongs to the
4963 // *next* transform, so advance past the current one.
4964 if bias == Bias::Right && at_transform_end {
4965 diff_transforms.next();
4966 continue;
4967 }
4968
4969 let mut position = diff_transforms.start().1;
4970 if let Some(DiffTransform::BufferContent { .. }) | None = item {
4971 let overshoot = excerpt_position - diff_transforms.start().0;
4972 position += overshoot;
4973 }
4974
4975 return position.0;
4976 }
4977 }
4978
4979 fn excerpt_offset_for_anchor(&self, anchor: &Anchor) -> ExcerptOffset {
4980 let anchor = match anchor {
4981 Anchor::Min => return ExcerptOffset::default(),
4982 Anchor::Excerpt(excerpt_anchor) => excerpt_anchor,
4983 Anchor::Max => return self.excerpts.summary().len(),
4984 };
4985 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
4986 let target = anchor.seek_target(self);
4987
4988 cursor.seek(&target, Bias::Left);
4989
4990 let mut position = cursor.start().len();
4991 if let Some(excerpt) = cursor.item()
4992 && excerpt.contains(anchor, self)
4993 {
4994 let buffer_snapshot = excerpt.buffer_snapshot(self);
4995 let excerpt_buffer_start =
4996 buffer_snapshot.offset_for_anchor(&excerpt.range.context.start);
4997 let excerpt_buffer_end = buffer_snapshot.offset_for_anchor(&excerpt.range.context.end);
4998 let buffer_position = cmp::min(
4999 excerpt_buffer_end,
5000 buffer_snapshot.offset_for_anchor(&anchor.text_anchor()),
5001 );
5002 if buffer_position > excerpt_buffer_start {
5003 position += buffer_position - excerpt_buffer_start;
5004 }
5005 }
5006 position
5007 }
5008
5009 pub fn summaries_for_anchors<'a, MBD, I>(&'a self, anchors: I) -> Vec<MBD>
5010 where
5011 MBD: MultiBufferDimension
5012 + Ord
5013 + Sub<Output = MBD::TextDimension>
5014 + AddAssign<MBD::TextDimension>,
5015 MBD::TextDimension: Sub<Output = MBD::TextDimension> + Ord,
5016 I: 'a + IntoIterator<Item = &'a Anchor>,
5017 {
5018 let mut anchors = anchors.into_iter().peekable();
5019 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
5020 let mut diff_transforms_cursor = self
5021 .diff_transforms
5022 .cursor::<Dimensions<ExcerptDimension<MBD>, OutputDimension<MBD>>>(());
5023 diff_transforms_cursor.next();
5024
5025 let mut summaries = Vec::new();
5026 while let Some(anchor) = anchors.peek() {
5027 let target = anchor.seek_target(self);
5028 let excerpt_anchor = match anchor {
5029 Anchor::Min => {
5030 summaries.push(MBD::default());
5031 anchors.next();
5032 continue;
5033 }
5034 Anchor::Excerpt(excerpt_anchor) => excerpt_anchor,
5035 Anchor::Max => {
5036 summaries.push(MBD::from_summary(&self.text_summary()));
5037 anchors.next();
5038 continue;
5039 }
5040 };
5041
5042 cursor.seek_forward(&target, Bias::Left);
5043
5044 let excerpt_start_position = ExcerptDimension(MBD::from_summary(&cursor.start().text));
5045 if let Some(excerpt) = cursor.item() {
5046 let buffer_snapshot = excerpt.buffer_snapshot(self);
5047 if !excerpt.contains(&excerpt_anchor, self) {
5048 diff_transforms_cursor.seek_forward(&excerpt_start_position, Bias::Left);
5049 let position = self.summary_for_excerpt_position_without_hunks(
5050 Bias::Left,
5051 excerpt_start_position,
5052 &mut diff_transforms_cursor,
5053 );
5054 summaries.push(position);
5055 anchors.next();
5056 continue;
5057 }
5058 let excerpt_buffer_start = excerpt
5059 .range
5060 .context
5061 .start
5062 .summary::<MBD::TextDimension>(buffer_snapshot);
5063 let excerpt_buffer_end = excerpt
5064 .range
5065 .context
5066 .end
5067 .summary::<MBD::TextDimension>(buffer_snapshot);
5068 for (buffer_summary, excerpt_anchor) in buffer_snapshot
5069 .summaries_for_anchors_with_payload::<MBD::TextDimension, _, _>(
5070 std::iter::from_fn(|| {
5071 let excerpt_anchor = anchors.peek()?.excerpt_anchor()?;
5072 if !excerpt.contains(&excerpt_anchor, self) {
5073 return None;
5074 }
5075 anchors.next();
5076 Some((excerpt_anchor.text_anchor(), excerpt_anchor))
5077 }),
5078 )
5079 {
5080 let summary = cmp::min(excerpt_buffer_end, buffer_summary);
5081 let mut position = excerpt_start_position;
5082 if summary > excerpt_buffer_start {
5083 position += summary - excerpt_buffer_start;
5084 }
5085
5086 if diff_transforms_cursor.start().0 < position {
5087 diff_transforms_cursor.seek_forward(&position, Bias::Left);
5088 }
5089
5090 summaries.push(self.summary_for_anchor_with_excerpt_position(
5091 excerpt_anchor,
5092 position,
5093 &mut diff_transforms_cursor,
5094 &buffer_snapshot,
5095 ));
5096 }
5097 } else {
5098 diff_transforms_cursor.seek_forward(&excerpt_start_position, Bias::Left);
5099 let position = self.summary_for_excerpt_position_without_hunks(
5100 Bias::Right,
5101 excerpt_start_position,
5102 &mut diff_transforms_cursor,
5103 );
5104 summaries.push(position);
5105 anchors.next();
5106 }
5107 }
5108
5109 summaries
5110 }
5111
5112 pub fn dimensions_from_points<'a, MBD>(
5113 &'a self,
5114 points: impl 'a + IntoIterator<Item = Point>,
5115 ) -> impl 'a + Iterator<Item = MBD>
5116 where
5117 MBD: MultiBufferDimension + Sub + AddAssign<<MBD as Sub>::Output>,
5118 {
5119 let mut cursor = self.cursor::<DimensionPair<Point, MBD>, Point>();
5120 cursor.seek(&DimensionPair {
5121 key: Point::default(),
5122 value: None,
5123 });
5124 let mut points = points.into_iter();
5125 iter::from_fn(move || {
5126 let point = points.next()?;
5127
5128 cursor.seek_forward(&DimensionPair {
5129 key: point,
5130 value: None,
5131 });
5132
5133 if let Some(region) = cursor.region() {
5134 let overshoot = point - region.range.start.key;
5135 let buffer_point = region.buffer_range.start + overshoot;
5136 let mut position = region.range.start.value.unwrap();
5137 position.add_text_dim(
5138 ®ion
5139 .buffer
5140 .text_summary_for_range(region.buffer_range.start..buffer_point),
5141 );
5142 if point == region.range.end.key && region.has_trailing_newline {
5143 position.add_mb_text_summary(&MBTextSummary::from(TextSummary::newline()));
5144 }
5145 Some(position)
5146 } else {
5147 Some(MBD::from_summary(&self.text_summary()))
5148 }
5149 })
5150 }
5151
5152 pub fn excerpts_for_buffer(
5153 &self,
5154 buffer_id: BufferId,
5155 ) -> impl Iterator<Item = ExcerptRange<text::Anchor>> {
5156 if let Some(buffer_state) = self.buffers.get(&buffer_id) {
5157 let path_key = buffer_state.path_key.clone();
5158 let mut cursor = self.excerpts.cursor::<PathKey>(());
5159 cursor.seek_forward(&path_key, Bias::Left);
5160 Some(iter::from_fn(move || {
5161 let excerpt = cursor.item()?;
5162 if excerpt.path_key != path_key {
5163 return None;
5164 }
5165 cursor.next();
5166 Some(excerpt.range.clone())
5167 }))
5168 } else {
5169 None
5170 }
5171 .into_iter()
5172 .flatten()
5173 }
5174
5175 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
5176 self.anchor_at(position, Bias::Left)
5177 }
5178
5179 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
5180 self.anchor_at(position, Bias::Right)
5181 }
5182
5183 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
5184 let offset = position.to_offset(self);
5185
5186 // Find the given position in the diff transforms. Determine the corresponding
5187 // offset in the excerpts, and whether the position is within a deleted hunk.
5188 let mut diff_transforms = self
5189 .diff_transforms
5190 .cursor::<Dimensions<MultiBufferOffset, ExcerptOffset>>(());
5191 diff_transforms.seek(&offset, Bias::Right);
5192
5193 if offset == diff_transforms.start().0
5194 && bias == Bias::Left
5195 && let Some(prev_item) = diff_transforms.prev_item()
5196 && let DiffTransform::DeletedHunk { .. } = prev_item
5197 {
5198 diff_transforms.prev();
5199 }
5200 let offset_in_transform = offset - diff_transforms.start().0;
5201 let mut excerpt_offset = diff_transforms.start().1;
5202 let mut diff_base_anchor = None;
5203 if let Some(DiffTransform::DeletedHunk {
5204 buffer_id,
5205 base_text_byte_range,
5206 has_trailing_newline,
5207 ..
5208 }) = diff_transforms.item()
5209 {
5210 let diff = self.diff_state(*buffer_id).expect("missing diff");
5211 if offset_in_transform > base_text_byte_range.len() {
5212 debug_assert!(*has_trailing_newline);
5213 bias = Bias::Right;
5214 } else {
5215 diff_base_anchor = Some(
5216 diff.base_text()
5217 .anchor_at(base_text_byte_range.start + offset_in_transform, bias),
5218 );
5219 bias = Bias::Left;
5220 }
5221 } else {
5222 excerpt_offset += MultiBufferOffset(offset_in_transform);
5223 };
5224
5225 let mut excerpts = self
5226 .excerpts
5227 .cursor::<Dimensions<ExcerptOffset, ExcerptSummary>>(());
5228 excerpts.seek(&excerpt_offset, Bias::Right);
5229 if excerpts.item().is_none() && excerpt_offset == excerpts.start().0 && bias == Bias::Left {
5230 excerpts.prev();
5231 }
5232 if let Some(excerpt) = excerpts.item() {
5233 let buffer_snapshot = excerpt.buffer_snapshot(self);
5234 let mut overshoot = excerpt_offset.saturating_sub(excerpts.start().0);
5235 if excerpt.has_trailing_newline && excerpt_offset == excerpts.end().0 {
5236 overshoot -= 1;
5237 bias = Bias::Right;
5238 }
5239
5240 let buffer_start = excerpt.range.context.start.to_offset(&buffer_snapshot);
5241 let text_anchor = excerpt.clip_anchor(
5242 buffer_snapshot.anchor_at(buffer_start + overshoot, bias),
5243 self,
5244 );
5245 let anchor = ExcerptAnchor::in_buffer(excerpt.path_key_index, text_anchor);
5246 let anchor = match diff_base_anchor {
5247 Some(diff_base_anchor) => anchor.with_diff_base_anchor(diff_base_anchor),
5248 None => anchor,
5249 };
5250 anchor.into()
5251 } else if excerpt_offset == ExcerptDimension(MultiBufferOffset::ZERO) && bias == Bias::Left
5252 {
5253 Anchor::Min
5254 } else {
5255 Anchor::Max
5256 }
5257 }
5258
5259 /// Lifts a buffer anchor to a multibuffer anchor without checking against excerpt boundaries. Returns `None` if there are no excerpts for the buffer
5260 pub fn anchor_in_buffer(&self, anchor: text::Anchor) -> Option<Anchor> {
5261 let path_key_index = self.path_key_index_for_buffer(anchor.buffer_id)?;
5262 Some(Anchor::in_buffer(path_key_index, anchor))
5263 }
5264
5265 /// Creates a multibuffer anchor for the given buffer anchor, if it is contained in any excerpt.
5266 pub fn anchor_in_excerpt(&self, text_anchor: text::Anchor) -> Option<Anchor> {
5267 for excerpt in {
5268 let this = &self;
5269 let buffer_id = text_anchor.buffer_id;
5270 if let Some(buffer_state) = this.buffers.get(&buffer_id) {
5271 let path_key = buffer_state.path_key.clone();
5272 let mut cursor = this.excerpts.cursor::<PathKey>(());
5273 cursor.seek_forward(&path_key, Bias::Left);
5274 Some(iter::from_fn(move || {
5275 let excerpt = cursor.item()?;
5276 if excerpt.path_key != path_key {
5277 return None;
5278 }
5279 cursor.next();
5280 Some(excerpt)
5281 }))
5282 } else {
5283 None
5284 }
5285 .into_iter()
5286 .flatten()
5287 } {
5288 let buffer_snapshot = excerpt.buffer_snapshot(self);
5289 if excerpt.range.contains(&text_anchor, &buffer_snapshot) {
5290 return Some(Anchor::in_buffer(excerpt.path_key_index, text_anchor));
5291 }
5292 }
5293
5294 None
5295 }
5296
5297 /// Creates a multibuffer anchor for the given buffer anchor, if it is contained in any excerpt.
5298 pub fn buffer_anchor_range_to_anchor_range(
5299 &self,
5300 text_anchor: Range<text::Anchor>,
5301 ) -> Option<Range<Anchor>> {
5302 if self.is_singleton() {
5303 let excerpt = self.excerpts.first()?;
5304 let buffer_snapshot = excerpt.buffer_snapshot(self);
5305 if excerpt.range.contains(&text_anchor.start, &buffer_snapshot)
5306 && excerpt.range.contains(&text_anchor.end, &buffer_snapshot)
5307 {
5308 return Some(Anchor::range_in_buffer(excerpt.path_key_index, text_anchor));
5309 }
5310 }
5311
5312 // for each search match
5313
5314 let mut buffer_snapshot = None;
5315 for excerpt in {
5316 let this = &self;
5317 let buffer_id = text_anchor.start.buffer_id;
5318 if let Some(buffer_state) = this.buffers.get(&buffer_id) {
5319 let path_key = buffer_state.path_key.clone();
5320 let mut cursor = this.excerpts.cursor::<PathKey>(());
5321 cursor.seek_forward(&path_key, Bias::Left);
5322 Some(iter::from_fn(move || {
5323 let excerpt = cursor.item()?;
5324 if excerpt.path_key != path_key {
5325 return None;
5326 }
5327 cursor.next();
5328 Some(excerpt)
5329 }))
5330 } else {
5331 None
5332 }
5333 .into_iter()
5334 .flatten()
5335 } {
5336 let buffer_snapshot =
5337 buffer_snapshot.get_or_insert_with(|| excerpt.buffer_snapshot(self));
5338 if excerpt.range.contains(&text_anchor.start, &buffer_snapshot)
5339 && excerpt.range.contains(&text_anchor.end, &buffer_snapshot)
5340 {
5341 return Some(Anchor::range_in_buffer(excerpt.path_key_index, text_anchor));
5342 }
5343 }
5344
5345 None
5346 }
5347
5348 /// Returns a buffer anchor and its buffer snapshot for the given anchor, if it is in the multibuffer.
5349 pub fn anchor_to_buffer_anchor(
5350 &self,
5351 anchor: Anchor,
5352 ) -> Option<(text::Anchor, &BufferSnapshot)> {
5353 match anchor {
5354 Anchor::Min => {
5355 let excerpt = self.excerpts.first()?;
5356 let buffer = excerpt.buffer_snapshot(self);
5357 Some((excerpt.range.context.start, buffer))
5358 }
5359 Anchor::Excerpt(excerpt_anchor) => {
5360 let buffer = self.buffer_for_id(excerpt_anchor.buffer_id())?;
5361 Some((excerpt_anchor.text_anchor, buffer))
5362 }
5363 Anchor::Max => {
5364 let excerpt = self.excerpts.last()?;
5365 let buffer = excerpt.buffer_snapshot(self);
5366 Some((excerpt.range.context.end, buffer))
5367 }
5368 }
5369 }
5370
5371 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
5372 match anchor {
5373 // todo(lw): should be `!self.is_empty()`
5374 Anchor::Min | Anchor::Max => true,
5375 Anchor::Excerpt(excerpt_anchor) => {
5376 let Some(target) = excerpt_anchor.try_seek_target(self) else {
5377 return false;
5378 };
5379 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
5380 cursor.seek(&target, Bias::Left);
5381 let Some(excerpt) = cursor.item() else {
5382 return false;
5383 };
5384 excerpt
5385 .buffer_snapshot(self)
5386 .can_resolve(&excerpt_anchor.text_anchor())
5387 }
5388 }
5389 }
5390
5391 pub fn excerpts(&self) -> impl Iterator<Item = ExcerptRange<text::Anchor>> {
5392 self.excerpts.iter().map(|excerpt| excerpt.range.clone())
5393 }
5394
5395 fn cursor<'a, MBD, BD>(&'a self) -> MultiBufferCursor<'a, MBD, BD>
5396 where
5397 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
5398 BD: TextDimension + AddAssign<<MBD as Sub>::Output>,
5399 {
5400 let excerpts = self.excerpts.cursor(());
5401 let diff_transforms = self.diff_transforms.cursor(());
5402 MultiBufferCursor {
5403 excerpts,
5404 diff_transforms,
5405 cached_region: OnceCell::new(),
5406 snapshot: self,
5407 }
5408 }
5409
5410 pub fn excerpt_before(&self, anchor: Anchor) -> Option<ExcerptRange<text::Anchor>> {
5411 let target = anchor.try_seek_target(&self)?;
5412 let mut excerpts = self.excerpts.cursor::<ExcerptSummary>(());
5413 excerpts.seek(&target, Bias::Left);
5414 excerpts.prev();
5415 Some(excerpts.item()?.range.clone())
5416 }
5417
5418 pub fn excerpt_boundaries_in_range<R, T>(
5419 &self,
5420 range: R,
5421 ) -> impl Iterator<Item = ExcerptBoundary> + '_
5422 where
5423 R: RangeBounds<T>,
5424 T: ToOffset,
5425 {
5426 let start_offset;
5427 let start = match range.start_bound() {
5428 Bound::Included(start) => {
5429 start_offset = start.to_offset(self);
5430 Bound::Included(start_offset)
5431 }
5432 Bound::Excluded(_) => {
5433 panic!("not supported")
5434 }
5435 Bound::Unbounded => {
5436 start_offset = MultiBufferOffset::ZERO;
5437 Bound::Unbounded
5438 }
5439 };
5440 let end = match range.end_bound() {
5441 Bound::Included(end) => Bound::Included(end.to_offset(self)),
5442 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
5443 Bound::Unbounded => Bound::Unbounded,
5444 };
5445 let bounds = (start, end);
5446 let mut cursor = self.cursor::<DimensionPair<MultiBufferOffset, Point>, BufferOffset>();
5447 cursor.seek(&DimensionPair {
5448 key: start_offset,
5449 value: None,
5450 });
5451
5452 if cursor
5453 .fetch_excerpt_with_range()
5454 .is_some_and(|(_, range)| bounds.contains(&range.start.key))
5455 {
5456 cursor.prev_excerpt();
5457 } else {
5458 cursor.seek_to_start_of_current_excerpt();
5459 }
5460 let mut prev_excerpt = cursor
5461 .fetch_excerpt_with_range()
5462 .map(|(excerpt, _)| excerpt);
5463
5464 cursor.next_excerpt_forwards();
5465
5466 iter::from_fn(move || {
5467 loop {
5468 if self.singleton {
5469 return None;
5470 }
5471
5472 let (next_excerpt, next_range) = cursor.fetch_excerpt_with_range()?;
5473 cursor.next_excerpt_forwards();
5474 if !bounds.contains(&next_range.start.key) {
5475 prev_excerpt = Some(next_excerpt);
5476 continue;
5477 }
5478
5479 let next_region_start = next_range.start.value.unwrap();
5480 let next_region_end = if let Some((_, range)) = cursor.fetch_excerpt_with_range() {
5481 range.start.value.unwrap()
5482 } else {
5483 self.max_point()
5484 };
5485
5486 let prev = prev_excerpt.as_ref().map(|excerpt| ExcerptBoundaryInfo {
5487 start_anchor: Anchor::in_buffer(
5488 excerpt.path_key_index,
5489 excerpt.range.context.start,
5490 ),
5491 range: excerpt.range.clone(),
5492 end_row: MultiBufferRow(next_region_start.row),
5493 });
5494
5495 let next = ExcerptBoundaryInfo {
5496 start_anchor: Anchor::in_buffer(
5497 next_excerpt.path_key_index,
5498 next_excerpt.range.context.start,
5499 ),
5500 range: next_excerpt.range.clone(),
5501 end_row: if next_excerpt.has_trailing_newline {
5502 MultiBufferRow(next_region_end.row - 1)
5503 } else {
5504 MultiBufferRow(next_region_end.row)
5505 },
5506 };
5507
5508 let row = MultiBufferRow(next_region_start.row);
5509
5510 prev_excerpt = Some(next_excerpt);
5511
5512 return Some(ExcerptBoundary { row, prev, next });
5513 }
5514 })
5515 }
5516
5517 pub fn edit_count(&self) -> usize {
5518 self.edit_count
5519 }
5520
5521 pub fn non_text_state_update_count(&self) -> usize {
5522 self.non_text_state_update_count
5523 }
5524
5525 /// Allows converting several ranges within the same excerpt between buffer offsets and multibuffer offsets.
5526 ///
5527 /// If the input range is contained in a single excerpt, invokes the callback with the full range of that excerpt
5528 /// and the input range both converted to buffer coordinates. The buffer ranges returned by the callback are lifted back
5529 /// to multibuffer offsets and returned.
5530 ///
5531 /// Returns `None` if the input range spans multiple excerpts.
5532 pub fn map_excerpt_ranges<'a, T>(
5533 &'a self,
5534 position: Range<MultiBufferOffset>,
5535 f: impl FnOnce(
5536 &'a BufferSnapshot,
5537 ExcerptRange<BufferOffset>,
5538 Range<BufferOffset>,
5539 ) -> Vec<(Range<BufferOffset>, T)>,
5540 ) -> Option<Vec<(Range<MultiBufferOffset>, T)>> {
5541 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
5542 cursor.seek(&position.start);
5543
5544 let region = cursor.region()?;
5545 if !region.is_main_buffer {
5546 return None;
5547 }
5548 let excerpt = cursor.excerpt()?;
5549 let excerpt_start = *cursor.excerpts.start();
5550 let input_buffer_start = cursor.buffer_position_at(&position.start)?;
5551
5552 cursor.seek_forward(&position.end);
5553 if cursor.excerpt()? != excerpt {
5554 return None;
5555 }
5556 let region = cursor.region()?;
5557 if !region.is_main_buffer {
5558 return None;
5559 }
5560 let input_buffer_end = cursor.buffer_position_at(&position.end)?;
5561 let input_buffer_range = input_buffer_start..input_buffer_end;
5562 let buffer = excerpt.buffer_snapshot(self);
5563 let excerpt_context_range = excerpt.range.context.to_offset(buffer);
5564 let excerpt_context_range =
5565 BufferOffset(excerpt_context_range.start)..BufferOffset(excerpt_context_range.end);
5566 let excerpt_primary_range = excerpt.range.primary.to_offset(buffer);
5567 let excerpt_primary_range =
5568 BufferOffset(excerpt_primary_range.start)..BufferOffset(excerpt_primary_range.end);
5569 let results = f(
5570 buffer,
5571 ExcerptRange {
5572 context: excerpt_context_range.clone(),
5573 primary: excerpt_primary_range,
5574 },
5575 input_buffer_range,
5576 );
5577 let mut diff_transforms = cursor.diff_transforms;
5578 Some(
5579 results
5580 .into_iter()
5581 .map(|(buffer_range, metadata)| {
5582 let clamped_start = buffer_range
5583 .start
5584 .max(excerpt_context_range.start)
5585 .min(excerpt_context_range.end);
5586 let clamped_end = buffer_range
5587 .end
5588 .max(clamped_start)
5589 .min(excerpt_context_range.end);
5590 let excerpt_offset_start =
5591 excerpt_start + (clamped_start.0 - excerpt_context_range.start.0);
5592 let excerpt_offset_end =
5593 excerpt_start + (clamped_end.0 - excerpt_context_range.start.0);
5594
5595 diff_transforms.seek(&excerpt_offset_start, Bias::Right);
5596 let mut output_start = diff_transforms.start().output_dimension;
5597 output_start +=
5598 excerpt_offset_start - diff_transforms.start().excerpt_dimension;
5599
5600 diff_transforms.seek_forward(&excerpt_offset_end, Bias::Right);
5601 let mut output_end = diff_transforms.start().output_dimension;
5602 output_end += excerpt_offset_end - diff_transforms.start().excerpt_dimension;
5603
5604 (output_start.0..output_end.0, metadata)
5605 })
5606 .collect(),
5607 )
5608 }
5609
5610 /// Returns the smallest enclosing bracket ranges containing the given range or
5611 /// None if no brackets contain range or the range is not contained in a single
5612 /// excerpt
5613 ///
5614 /// Can optionally pass a range_filter to filter the ranges of brackets to consider
5615 #[ztracing::instrument(skip_all)]
5616 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
5617 &self,
5618 range: Range<T>,
5619 range_filter: Option<
5620 &dyn Fn(&BufferSnapshot, Range<BufferOffset>, Range<BufferOffset>) -> bool,
5621 >,
5622 ) -> Option<(Range<MultiBufferOffset>, Range<MultiBufferOffset>)> {
5623 let range = range.start.to_offset(self)..range.end.to_offset(self);
5624 let results =
5625 self.map_excerpt_ranges(range, |buffer, excerpt_range, input_buffer_range| {
5626 let filter = |open: Range<usize>, close: Range<usize>| -> bool {
5627 excerpt_range.context.start.0 <= open.start
5628 && close.end <= excerpt_range.context.end.0
5629 && range_filter.is_none_or(|filter| {
5630 filter(
5631 buffer,
5632 BufferOffset(open.start)..BufferOffset(close.end),
5633 BufferOffset(close.start)..BufferOffset(close.end),
5634 )
5635 })
5636 };
5637 let Some((open, close)) =
5638 buffer.innermost_enclosing_bracket_ranges(input_buffer_range, Some(&filter))
5639 else {
5640 return Vec::new();
5641 };
5642 vec![
5643 (BufferOffset(open.start)..BufferOffset(open.end), ()),
5644 (BufferOffset(close.start)..BufferOffset(close.end), ()),
5645 ]
5646 })?;
5647 let [(open, _), (close, _)] = results.try_into().ok()?;
5648 Some((open, close))
5649 }
5650
5651 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5652 /// not contained in a single excerpt
5653 pub fn enclosing_bracket_ranges<T: ToOffset>(
5654 &self,
5655 range: Range<T>,
5656 ) -> Option<impl Iterator<Item = (Range<MultiBufferOffset>, Range<MultiBufferOffset>)>> {
5657 let range = range.start.to_offset(self)..range.end.to_offset(self);
5658 let results =
5659 self.map_excerpt_ranges(range, |buffer, excerpt_range, input_buffer_range| {
5660 buffer
5661 .enclosing_bracket_ranges(input_buffer_range)
5662 .filter(|pair| {
5663 excerpt_range.context.start.0 <= pair.open_range.start
5664 && pair.close_range.end <= excerpt_range.context.end.0
5665 })
5666 .flat_map(|pair| {
5667 [
5668 (
5669 BufferOffset(pair.open_range.start)
5670 ..BufferOffset(pair.open_range.end),
5671 (),
5672 ),
5673 (
5674 BufferOffset(pair.close_range.start)
5675 ..BufferOffset(pair.close_range.end),
5676 (),
5677 ),
5678 ]
5679 })
5680 .collect()
5681 })?;
5682 Some(results.into_iter().map(|(range, _)| range).tuples())
5683 }
5684
5685 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5686 /// not contained in a single excerpt
5687 pub fn text_object_ranges<T: ToOffset>(
5688 &self,
5689 range: Range<T>,
5690 options: TreeSitterOptions,
5691 ) -> impl Iterator<Item = (Range<MultiBufferOffset>, TextObject)> + '_ {
5692 let range = range.start.to_offset(self)..range.end.to_offset(self);
5693 self.map_excerpt_ranges(range, |buffer, excerpt_range, input_buffer_range| {
5694 buffer
5695 .text_object_ranges(input_buffer_range, options)
5696 .filter(|(range, _)| {
5697 excerpt_range.context.start.0 <= range.start
5698 && range.end <= excerpt_range.context.end.0
5699 })
5700 .map(|(range, text_object)| {
5701 (
5702 BufferOffset(range.start)..BufferOffset(range.end),
5703 text_object,
5704 )
5705 })
5706 .collect()
5707 })
5708 .into_iter()
5709 .flatten()
5710 }
5711
5712 pub fn bracket_ranges<T: ToOffset>(
5713 &self,
5714 range: Range<T>,
5715 ) -> Option<impl Iterator<Item = (Range<MultiBufferOffset>, Range<MultiBufferOffset>)>> {
5716 let range = range.start.to_offset(self)..range.end.to_offset(self);
5717 let results =
5718 self.map_excerpt_ranges(range, |buffer, excerpt_range, input_buffer_range| {
5719 buffer
5720 .bracket_ranges(input_buffer_range)
5721 .filter(|pair| {
5722 excerpt_range.context.start.0 <= pair.open_range.start
5723 && pair.close_range.end <= excerpt_range.context.end.0
5724 })
5725 .flat_map(|pair| {
5726 [
5727 (
5728 BufferOffset(pair.open_range.start)
5729 ..BufferOffset(pair.open_range.end),
5730 (),
5731 ),
5732 (
5733 BufferOffset(pair.close_range.start)
5734 ..BufferOffset(pair.close_range.end),
5735 (),
5736 ),
5737 ]
5738 })
5739 .collect()
5740 })?;
5741 Some(results.into_iter().map(|(range, _)| range).tuples())
5742 }
5743
5744 pub fn redacted_ranges<'a, T: ToOffset>(
5745 &'a self,
5746 range: Range<T>,
5747 redaction_enabled: impl Fn(Option<&Arc<dyn File>>) -> bool + 'a,
5748 ) -> impl Iterator<Item = Range<MultiBufferOffset>> + 'a {
5749 let range = range.start.to_offset(self)..range.end.to_offset(self);
5750 self.lift_buffer_metadata(range, move |buffer, range| {
5751 if redaction_enabled(buffer.file()) {
5752 Some(buffer.redacted_ranges(range).map(|range| (range, ())))
5753 } else {
5754 None
5755 }
5756 })
5757 .map(|(range, _, _)| range)
5758 }
5759
5760 pub fn runnable_ranges(
5761 &self,
5762 range: Range<Anchor>,
5763 ) -> impl Iterator<Item = (Range<Anchor>, language::RunnableRange)> + '_ {
5764 let range = range.start.to_offset(self)..range.end.to_offset(self);
5765 self.lift_buffer_metadata(range, move |buffer, range| {
5766 Some(
5767 buffer
5768 .runnable_ranges(range.clone())
5769 .filter(move |runnable| {
5770 runnable.run_range.start >= range.start
5771 && runnable.run_range.end < range.end
5772 })
5773 .map(|runnable| (runnable.run_range.clone(), runnable)),
5774 )
5775 })
5776 .map(|(run_range, runnable, _)| {
5777 (
5778 self.anchor_after(run_range.start)..self.anchor_before(run_range.end),
5779 runnable,
5780 )
5781 })
5782 }
5783
5784 pub fn line_indents(
5785 &self,
5786 start_row: MultiBufferRow,
5787 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5788 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5789 let max_point = self.max_point();
5790 let mut cursor = self.cursor::<Point, Point>();
5791 cursor.seek(&Point::new(start_row.0, 0));
5792 iter::from_fn(move || {
5793 let mut region = cursor.region()?;
5794 while !buffer_filter(®ion.excerpt.buffer_snapshot(self)) {
5795 cursor.next();
5796 region = cursor.region()?;
5797 }
5798 let region = cursor.region()?;
5799 let overshoot = start_row.0.saturating_sub(region.range.start.row);
5800 let buffer_start_row =
5801 (region.buffer_range.start.row + overshoot).min(region.buffer_range.end.row);
5802
5803 let buffer_end_row = if region.is_main_buffer
5804 && (region.has_trailing_newline || region.range.end == max_point)
5805 {
5806 region.buffer_range.end.row
5807 } else {
5808 region.buffer_range.end.row.saturating_sub(1)
5809 };
5810
5811 let line_indents = region
5812 .buffer
5813 .line_indents_in_row_range(buffer_start_row..buffer_end_row);
5814 let region_buffer_row = region.buffer_range.start.row;
5815 let region_row = region.range.start.row;
5816 let region_buffer = region.excerpt.buffer_snapshot(self);
5817 cursor.next();
5818 Some(line_indents.map(move |(buffer_row, indent)| {
5819 let row = region_row + (buffer_row - region_buffer_row);
5820 (MultiBufferRow(row), indent, region_buffer)
5821 }))
5822 })
5823 .flatten()
5824 }
5825
5826 pub fn reversed_line_indents(
5827 &self,
5828 end_row: MultiBufferRow,
5829 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5830 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5831 let max_point = self.max_point();
5832 let mut cursor = self.cursor::<Point, Point>();
5833 cursor.seek(&Point::new(end_row.0, 0));
5834 iter::from_fn(move || {
5835 let mut region = cursor.region()?;
5836 while !buffer_filter(®ion.excerpt.buffer_snapshot(self)) {
5837 cursor.prev();
5838 region = cursor.region()?;
5839 }
5840 let region = cursor.region()?;
5841
5842 let buffer_start_row = region.buffer_range.start.row;
5843 let buffer_end_row = if region.is_main_buffer
5844 && (region.has_trailing_newline || region.range.end == max_point)
5845 {
5846 region.buffer_range.end.row + 1
5847 } else {
5848 region.buffer_range.end.row
5849 };
5850
5851 let overshoot = end_row.0 - region.range.start.row;
5852 let buffer_end_row =
5853 (region.buffer_range.start.row + overshoot + 1).min(buffer_end_row);
5854
5855 let line_indents = region
5856 .buffer
5857 .reversed_line_indents_in_row_range(buffer_start_row..buffer_end_row);
5858 let region_buffer_row = region.buffer_range.start.row;
5859 let region_row = region.range.start.row;
5860 let region_buffer = region.excerpt.buffer_snapshot(self);
5861 cursor.prev();
5862 Some(line_indents.map(move |(buffer_row, indent)| {
5863 let row = region_row + (buffer_row - region_buffer_row);
5864 (MultiBufferRow(row), indent, region_buffer)
5865 }))
5866 })
5867 .flatten()
5868 }
5869
5870 pub async fn enclosing_indent(
5871 &self,
5872 mut target_row: MultiBufferRow,
5873 ) -> Option<(Range<MultiBufferRow>, LineIndent)> {
5874 let max_row = MultiBufferRow(self.max_point().row);
5875 if target_row >= max_row {
5876 return None;
5877 }
5878
5879 let mut target_indent = self.line_indent_for_row(target_row);
5880
5881 // If the current row is at the start of an indented block, we want to return this
5882 // block as the enclosing indent.
5883 if !target_indent.is_line_empty() && target_row < max_row {
5884 let next_line_indent = self.line_indent_for_row(MultiBufferRow(target_row.0 + 1));
5885 if !next_line_indent.is_line_empty()
5886 && target_indent.raw_len() < next_line_indent.raw_len()
5887 {
5888 target_indent = next_line_indent;
5889 target_row.0 += 1;
5890 }
5891 }
5892
5893 const SEARCH_ROW_LIMIT: u32 = 25000;
5894 const SEARCH_WHITESPACE_ROW_LIMIT: u32 = 2500;
5895 const YIELD_INTERVAL: u32 = 100;
5896
5897 let mut accessed_row_counter = 0;
5898
5899 // If there is a blank line at the current row, search for the next non indented lines
5900 if target_indent.is_line_empty() {
5901 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_WHITESPACE_ROW_LIMIT));
5902 let end =
5903 MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_WHITESPACE_ROW_LIMIT));
5904
5905 let mut non_empty_line_above = None;
5906 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5907 if row < start {
5908 break;
5909 }
5910 accessed_row_counter += 1;
5911 if accessed_row_counter == YIELD_INTERVAL {
5912 accessed_row_counter = 0;
5913 yield_now().await;
5914 }
5915 if !indent.is_line_empty() {
5916 non_empty_line_above = Some((row, indent));
5917 break;
5918 }
5919 }
5920
5921 let mut non_empty_line_below = None;
5922 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5923 if row > end {
5924 break;
5925 }
5926 accessed_row_counter += 1;
5927 if accessed_row_counter == YIELD_INTERVAL {
5928 accessed_row_counter = 0;
5929 yield_now().await;
5930 }
5931 if !indent.is_line_empty() {
5932 non_empty_line_below = Some((row, indent));
5933 break;
5934 }
5935 }
5936
5937 let (row, indent) = match (non_empty_line_above, non_empty_line_below) {
5938 (Some((above_row, above_indent)), Some((below_row, below_indent))) => {
5939 if above_indent.raw_len() >= below_indent.raw_len() {
5940 (above_row, above_indent)
5941 } else {
5942 (below_row, below_indent)
5943 }
5944 }
5945 (Some(above), None) => above,
5946 (None, Some(below)) => below,
5947 _ => return None,
5948 };
5949
5950 target_indent = indent;
5951 target_row = row;
5952 }
5953
5954 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_ROW_LIMIT));
5955 let end = MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_ROW_LIMIT));
5956
5957 let mut start_indent = None;
5958 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5959 if row < start {
5960 break;
5961 }
5962 accessed_row_counter += 1;
5963 if accessed_row_counter == YIELD_INTERVAL {
5964 accessed_row_counter = 0;
5965 yield_now().await;
5966 }
5967 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5968 start_indent = Some((row, indent));
5969 break;
5970 }
5971 }
5972 let (start_row, start_indent_size) = start_indent?;
5973
5974 let mut end_indent = (end, None);
5975 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5976 if row > end {
5977 break;
5978 }
5979 accessed_row_counter += 1;
5980 if accessed_row_counter == YIELD_INTERVAL {
5981 accessed_row_counter = 0;
5982 yield_now().await;
5983 }
5984 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5985 end_indent = (MultiBufferRow(row.0.saturating_sub(1)), Some(indent));
5986 break;
5987 }
5988 }
5989 let (end_row, end_indent_size) = end_indent;
5990
5991 let indent = if let Some(end_indent_size) = end_indent_size {
5992 if start_indent_size.raw_len() > end_indent_size.raw_len() {
5993 start_indent_size
5994 } else {
5995 end_indent_size
5996 }
5997 } else {
5998 start_indent_size
5999 };
6000
6001 Some((start_row..end_row, indent))
6002 }
6003
6004 pub fn indent_guides_in_range<T: ToPoint>(
6005 &self,
6006 range: Range<T>,
6007 ignore_disabled_for_language: bool,
6008 cx: &App,
6009 ) -> impl Iterator<Item = IndentGuide> {
6010 let range = range.start.to_point(self)..range.end.to_point(self);
6011 let start_row = MultiBufferRow(range.start.row);
6012 let end_row = MultiBufferRow(range.end.row);
6013
6014 let mut row_indents = self.line_indents(start_row, |buffer| {
6015 let settings = LanguageSettings::for_buffer_snapshot(buffer, None, cx);
6016 settings.indent_guides.enabled || ignore_disabled_for_language
6017 });
6018
6019 let mut result = Vec::new();
6020 let mut indent_stack = SmallVec::<[IndentGuide; 8]>::new();
6021
6022 let mut prev_settings = None;
6023 while let Some((first_row, mut line_indent, buffer)) = row_indents.next() {
6024 if first_row > end_row {
6025 break;
6026 }
6027 let current_depth = indent_stack.len() as u32;
6028
6029 // Avoid retrieving the language settings repeatedly for every buffer row.
6030 if let Some((prev_buffer_id, _)) = &prev_settings
6031 && prev_buffer_id != &buffer.remote_id()
6032 {
6033 prev_settings.take();
6034 }
6035 let settings = &prev_settings
6036 .get_or_insert_with(|| {
6037 (
6038 buffer.remote_id(),
6039 LanguageSettings::for_buffer_snapshot(buffer, None, cx),
6040 )
6041 })
6042 .1;
6043 let tab_size = settings.tab_size.get();
6044
6045 // When encountering empty, continue until found useful line indent
6046 // then add to the indent stack with the depth found
6047 let mut found_indent = false;
6048 let mut last_row = first_row;
6049 if line_indent.is_line_blank() {
6050 while !found_indent {
6051 let Some((target_row, new_line_indent, _)) = row_indents.next() else {
6052 break;
6053 };
6054 const TRAILING_ROW_SEARCH_LIMIT: u32 = 25;
6055 if target_row > MultiBufferRow(end_row.0 + TRAILING_ROW_SEARCH_LIMIT) {
6056 break;
6057 }
6058
6059 if new_line_indent.is_line_blank() {
6060 continue;
6061 }
6062 last_row = target_row.min(end_row);
6063 line_indent = new_line_indent;
6064 found_indent = true;
6065 break;
6066 }
6067 } else {
6068 found_indent = true
6069 }
6070
6071 let depth = if found_indent {
6072 line_indent.len(tab_size) / tab_size
6073 } else {
6074 0
6075 };
6076
6077 match depth.cmp(¤t_depth) {
6078 cmp::Ordering::Less => {
6079 for _ in 0..(current_depth - depth) {
6080 let mut indent = indent_stack.pop().unwrap();
6081 if last_row != first_row {
6082 // In this case, we landed on an empty row, had to seek forward,
6083 // and discovered that the indent we where on is ending.
6084 // This means that the last display row must
6085 // be on line that ends this indent range, so we
6086 // should display the range up to the first non-empty line
6087 indent.end_row = MultiBufferRow(first_row.0.saturating_sub(1));
6088 }
6089
6090 result.push(indent)
6091 }
6092 }
6093 cmp::Ordering::Greater => {
6094 for next_depth in current_depth..depth {
6095 indent_stack.push(IndentGuide {
6096 buffer_id: buffer.remote_id(),
6097 start_row: first_row,
6098 end_row: last_row,
6099 depth: next_depth,
6100 tab_size,
6101 settings: settings.indent_guides.clone(),
6102 });
6103 }
6104 }
6105 _ => {}
6106 }
6107
6108 for indent in indent_stack.iter_mut() {
6109 indent.end_row = last_row;
6110 }
6111 }
6112
6113 result.extend(indent_stack);
6114 result.into_iter()
6115 }
6116
6117 pub fn trailing_excerpt_update_count(&self) -> usize {
6118 self.trailing_excerpt_update_count
6119 }
6120
6121 pub fn file_at<T: ToOffset>(&self, point: T) -> Option<&Arc<dyn File>> {
6122 self.point_to_buffer_offset(point)
6123 .and_then(|(buffer, _)| buffer.file())
6124 }
6125
6126 pub fn language_at<T: ToOffset>(&self, offset: T) -> Option<&Arc<Language>> {
6127 self.point_to_buffer_offset(offset)
6128 .and_then(|(buffer, offset)| buffer.language_at(offset))
6129 }
6130
6131 fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
6132 self.excerpts
6133 .first()
6134 .map(|excerpt| excerpt.buffer_snapshot(self))
6135 .map(|buffer| LanguageSettings::for_buffer_snapshot(buffer, None, cx))
6136 .unwrap_or_else(move || self.language_settings_at(MultiBufferOffset::ZERO, cx))
6137 }
6138
6139 pub fn language_settings_at<'a, T: ToOffset>(
6140 &'a self,
6141 point: T,
6142 cx: &'a App,
6143 ) -> Cow<'a, LanguageSettings> {
6144 if let Some((buffer, offset)) = self.point_to_buffer_offset(point) {
6145 buffer.settings_at(offset, cx)
6146 } else {
6147 Cow::Borrowed(&AllLanguageSettings::get_global(cx).defaults)
6148 }
6149 }
6150
6151 pub fn language_scope_at<T: ToOffset>(&self, point: T) -> Option<LanguageScope> {
6152 self.point_to_buffer_offset(point)
6153 .and_then(|(buffer, offset)| buffer.language_scope_at(offset))
6154 }
6155
6156 pub fn char_classifier_at<T: ToOffset>(&self, point: T) -> CharClassifier {
6157 self.point_to_buffer_offset(point)
6158 .map(|(buffer, offset)| buffer.char_classifier_at(offset))
6159 .unwrap_or_default()
6160 }
6161
6162 pub fn language_indent_size_at<T: ToOffset>(
6163 &self,
6164 position: T,
6165 cx: &App,
6166 ) -> Option<IndentSize> {
6167 let (buffer_snapshot, offset) = self.point_to_buffer_offset(position)?;
6168 Some(buffer_snapshot.language_indent_size_at(offset, cx))
6169 }
6170
6171 pub fn is_dirty(&self) -> bool {
6172 self.is_dirty
6173 }
6174
6175 pub fn has_deleted_file(&self) -> bool {
6176 self.has_deleted_file
6177 }
6178
6179 pub fn has_conflict(&self) -> bool {
6180 self.has_conflict
6181 }
6182
6183 pub fn has_diagnostics(&self) -> bool {
6184 self.excerpts
6185 .iter()
6186 .any(|excerpt| excerpt.buffer_snapshot(self).has_diagnostics())
6187 }
6188
6189 pub fn diagnostic_group(
6190 &self,
6191 buffer_id: BufferId,
6192 group_id: usize,
6193 ) -> impl Iterator<Item = DiagnosticEntryRef<'_, Point>> + '_ {
6194 self.lift_buffer_metadata::<Point, _, _>(
6195 Point::zero()..self.max_point(),
6196 move |buffer, range| {
6197 if buffer.remote_id() != buffer_id {
6198 return None;
6199 };
6200 Some(
6201 buffer
6202 .diagnostics_in_range(range, false)
6203 .filter(move |diagnostic| diagnostic.diagnostic.group_id == group_id)
6204 .map(move |DiagnosticEntryRef { diagnostic, range }| (range, diagnostic)),
6205 )
6206 },
6207 )
6208 .map(|(range, diagnostic, _)| DiagnosticEntryRef { diagnostic, range })
6209 }
6210
6211 pub fn diagnostics_in_range<'a, MBD>(
6212 &'a self,
6213 range: Range<MBD>,
6214 ) -> impl Iterator<Item = DiagnosticEntryRef<'a, MBD>> + 'a
6215 where
6216 MBD::TextDimension: 'a
6217 + text::ToOffset
6218 + text::FromAnchor
6219 + Sub<Output = MBD::TextDimension>
6220 + fmt::Debug
6221 + ops::Add<Output = MBD::TextDimension>
6222 + ops::AddAssign
6223 + Ord,
6224 MBD: MultiBufferDimension
6225 + Ord
6226 + Sub<Output = MBD::TextDimension>
6227 + ops::Add<MBD::TextDimension, Output = MBD>
6228 + ops::AddAssign<MBD::TextDimension>
6229 + 'a,
6230 {
6231 self.lift_buffer_metadata::<MBD, _, _>(range, move |buffer, buffer_range| {
6232 Some(
6233 buffer
6234 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
6235 .map(|entry| (entry.range, entry.diagnostic)),
6236 )
6237 })
6238 .map(|(range, diagnostic, _)| DiagnosticEntryRef { diagnostic, range })
6239 }
6240
6241 pub fn diagnostics_with_buffer_ids_in_range<'a, MBD>(
6242 &'a self,
6243 range: Range<MBD>,
6244 ) -> impl Iterator<Item = (BufferId, DiagnosticEntryRef<'a, MBD>)> + 'a
6245 where
6246 MBD: MultiBufferDimension
6247 + Ord
6248 + Sub<Output = MBD::TextDimension>
6249 + ops::Add<MBD::TextDimension, Output = MBD>
6250 + ops::AddAssign<MBD::TextDimension>,
6251 MBD::TextDimension: Sub<Output = MBD::TextDimension>
6252 + ops::Add<Output = MBD::TextDimension>
6253 + text::ToOffset
6254 + text::FromAnchor
6255 + AddAssign<MBD::TextDimension>
6256 + Ord,
6257 {
6258 self.lift_buffer_metadata::<MBD, _, _>(range, move |buffer, buffer_range| {
6259 Some(
6260 buffer
6261 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
6262 .map(|entry| (entry.range, entry.diagnostic)),
6263 )
6264 })
6265 .map(|(range, diagnostic, excerpt)| {
6266 (
6267 excerpt.buffer_snapshot(self).remote_id(),
6268 DiagnosticEntryRef { diagnostic, range },
6269 )
6270 })
6271 }
6272
6273 pub fn syntax_ancestor<T: ToOffset>(
6274 &self,
6275 range: Range<T>,
6276 ) -> Option<(tree_sitter::Node<'_>, Range<MultiBufferOffset>)> {
6277 let range = range.start.to_offset(self)..range.end.to_offset(self);
6278 let results =
6279 self.map_excerpt_ranges(range, |buffer, excerpt_range, input_buffer_range| {
6280 let Some(node) = buffer.syntax_ancestor(input_buffer_range) else {
6281 return vec![];
6282 };
6283 let node_range = node.byte_range();
6284 if excerpt_range.context.start.0 <= node_range.start
6285 && node_range.end <= excerpt_range.context.end.0
6286 {
6287 vec![(
6288 BufferOffset(node_range.start)..BufferOffset(node_range.end),
6289 node,
6290 )]
6291 } else {
6292 vec![]
6293 }
6294 })?;
6295 let (output_range, node) = results.into_iter().next()?;
6296 Some((node, output_range))
6297 }
6298
6299 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
6300 let buffer_snapshot = self.as_singleton()?;
6301 let excerpt = self.excerpts.first()?;
6302 let path_key_index = excerpt.path_key_index;
6303 let outline = buffer_snapshot.outline(theme);
6304 Some(Outline::new(
6305 outline
6306 .items
6307 .into_iter()
6308 .map(|item| OutlineItem {
6309 depth: item.depth,
6310 range: Anchor::range_in_buffer(path_key_index, item.range),
6311 source_range_for_text: Anchor::range_in_buffer(
6312 path_key_index,
6313 item.source_range_for_text,
6314 ),
6315 text: item.text,
6316 highlight_ranges: item.highlight_ranges,
6317 name_ranges: item.name_ranges,
6318 body_range: item
6319 .body_range
6320 .map(|body_range| Anchor::range_in_buffer(path_key_index, body_range)),
6321 annotation_range: item.annotation_range.map(|annotation_range| {
6322 Anchor::range_in_buffer(path_key_index, annotation_range)
6323 }),
6324 })
6325 .collect(),
6326 ))
6327 }
6328
6329 pub fn symbols_containing<T: ToOffset>(
6330 &self,
6331 offset: T,
6332 theme: Option<&SyntaxTheme>,
6333 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
6334 let anchor = self.anchor_before(offset);
6335 let target = anchor.try_seek_target(&self)?;
6336 let (_, _, excerpt) = self.excerpts.find((), &target, Bias::Left);
6337 let excerpt = excerpt?;
6338 let buffer_snapshot = excerpt.buffer_snapshot(self);
6339 Some((
6340 buffer_snapshot.remote_id(),
6341 buffer_snapshot
6342 .symbols_containing(
6343 anchor
6344 .excerpt_anchor()
6345 .map(|anchor| anchor.text_anchor())
6346 .unwrap_or(text::Anchor::min_for_buffer(buffer_snapshot.remote_id())),
6347 theme,
6348 )
6349 .into_iter()
6350 .flat_map(|item| {
6351 Some(OutlineItem {
6352 depth: item.depth,
6353 source_range_for_text: Anchor::range_in_buffer(
6354 excerpt.path_key_index,
6355 item.source_range_for_text,
6356 ),
6357 range: Anchor::range_in_buffer(excerpt.path_key_index, item.range),
6358 text: item.text,
6359 highlight_ranges: item.highlight_ranges,
6360 name_ranges: item.name_ranges,
6361 body_range: item.body_range.map(|body_range| {
6362 Anchor::range_in_buffer(excerpt.path_key_index, body_range)
6363 }),
6364 annotation_range: item.annotation_range.map(|body_range| {
6365 Anchor::range_in_buffer(excerpt.path_key_index, body_range)
6366 }),
6367 })
6368 })
6369 .collect(),
6370 ))
6371 }
6372
6373 pub fn buffer_for_path(&self, path: &PathKey) -> Option<&BufferSnapshot> {
6374 let (_, _, excerpt) = self
6375 .excerpts
6376 .find::<ExcerptSummary, _>((), path, Bias::Left);
6377 Some(excerpt?.buffer_snapshot(self))
6378 }
6379
6380 pub fn path_for_buffer(&self, buffer_id: BufferId) -> Option<&PathKey> {
6381 Some(&self.buffers.get(&buffer_id)?.path_key)
6382 }
6383
6384 pub(crate) fn path_key_index_for_buffer(&self, buffer_id: BufferId) -> Option<PathKeyIndex> {
6385 let snapshot = self.buffers.get(&buffer_id)?;
6386 Some(snapshot.path_key_index)
6387 }
6388
6389 fn first_excerpt_for_buffer(&self, buffer_id: BufferId) -> Option<&Excerpt> {
6390 let path_key = &self.buffers.get(&buffer_id)?.path_key;
6391 self.first_excerpt_for_path(path_key)
6392 }
6393
6394 fn first_excerpt_for_path(&self, path_key: &PathKey) -> Option<&Excerpt> {
6395 let (_, _, first_excerpt) =
6396 self.excerpts
6397 .find::<ExcerptSummary, _>((), path_key, Bias::Left);
6398 first_excerpt
6399 }
6400
6401 pub fn buffer_for_id(&self, id: BufferId) -> Option<&BufferSnapshot> {
6402 self.buffers.get(&id).map(|state| &state.buffer_snapshot)
6403 }
6404
6405 fn try_path_for_anchor(&self, anchor: ExcerptAnchor) -> Option<&PathKey> {
6406 self.path_keys_by_index.get(&anchor.path)
6407 }
6408
6409 pub fn path_for_anchor(&self, anchor: ExcerptAnchor) -> &PathKey {
6410 self.try_path_for_anchor(anchor)
6411 .expect("invalid anchor: path was never added to multibuffer")
6412 }
6413
6414 /// Returns the excerpt containing range and its offset start within the multibuffer or none if `range` spans multiple excerpts
6415 pub fn excerpt_containing<T: ToOffset>(
6416 &self,
6417 range: Range<T>,
6418 ) -> Option<(&BufferSnapshot, ExcerptRange<text::Anchor>)> {
6419 let range = range.start.to_offset(self)..range.end.to_offset(self);
6420 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
6421 cursor.seek(&range.start);
6422
6423 let start_excerpt = cursor.excerpt()?;
6424 if range.end != range.start {
6425 cursor.seek_forward(&range.end);
6426 if cursor.excerpt()? != start_excerpt {
6427 return None;
6428 }
6429 }
6430
6431 Some((
6432 start_excerpt.buffer_snapshot(self),
6433 start_excerpt.range.clone(),
6434 ))
6435 }
6436
6437 pub fn selections_in_range<'a>(
6438 &'a self,
6439 range: &'a Range<Anchor>,
6440 include_local: bool,
6441 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
6442 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
6443 cursor.seek(&range.start.seek_target(self), Bias::Left);
6444 cursor
6445 .take_while(move |excerpt| {
6446 let excerpt_start =
6447 Anchor::in_buffer(excerpt.path_key_index, excerpt.range.context.start);
6448 excerpt_start.cmp(&range.end, self).is_le()
6449 })
6450 .flat_map(move |excerpt| {
6451 let buffer_snapshot = excerpt.buffer_snapshot(self);
6452 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
6453 if let Some(excerpt_anchor) = range.start.excerpt_anchor()
6454 && excerpt.contains(&excerpt_anchor, self)
6455 {
6456 query_range.start = excerpt_anchor.text_anchor();
6457 }
6458 if let Some(excerpt_anchor) = range.end.excerpt_anchor()
6459 && excerpt.contains(&excerpt_anchor, self)
6460 {
6461 query_range.end = excerpt_anchor.text_anchor();
6462 }
6463
6464 buffer_snapshot
6465 .selections_in_range(query_range, include_local)
6466 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
6467 selections.map(move |selection| {
6468 let mut start =
6469 Anchor::in_buffer(excerpt.path_key_index, selection.start);
6470 let mut end = Anchor::in_buffer(excerpt.path_key_index, selection.end);
6471 if range.start.cmp(&start, self).is_gt() {
6472 start = range.start;
6473 }
6474 if range.end.cmp(&end, self).is_lt() {
6475 end = range.end;
6476 }
6477
6478 (
6479 replica_id,
6480 line_mode,
6481 cursor_shape,
6482 Selection {
6483 id: selection.id,
6484 start,
6485 end,
6486 reversed: selection.reversed,
6487 goal: selection.goal,
6488 },
6489 )
6490 })
6491 })
6492 })
6493 }
6494
6495 pub fn show_headers(&self) -> bool {
6496 self.show_headers
6497 }
6498
6499 pub fn diff_for_buffer_id(&self, buffer_id: BufferId) -> Option<&BufferDiffSnapshot> {
6500 self.diff_state(buffer_id).map(|diff| &diff.diff)
6501 }
6502
6503 fn diff_state(&self, buffer_id: BufferId) -> Option<&DiffStateSnapshot> {
6504 find_diff_state(&self.diffs, buffer_id)
6505 }
6506
6507 pub fn total_changed_lines(&self) -> (u32, u32) {
6508 let summary = self.diffs.summary();
6509 (summary.added_rows, summary.removed_rows)
6510 }
6511
6512 pub fn all_diff_hunks_expanded(&self) -> bool {
6513 self.all_diff_hunks_expanded
6514 }
6515
6516 /// Visually annotates a position or range with the `Debug` representation of a value. The
6517 /// callsite of this function is used as a key - previous annotations will be removed.
6518 #[cfg(debug_assertions)]
6519 #[track_caller]
6520 pub fn debug<V, R>(&self, ranges: &R, value: V)
6521 where
6522 R: debug::ToMultiBufferDebugRanges,
6523 V: std::fmt::Debug,
6524 {
6525 self.debug_with_key(std::panic::Location::caller(), ranges, value);
6526 }
6527
6528 /// Visually annotates a position or range with the `Debug` representation of a value. Previous
6529 /// debug annotations with the same key will be removed. The key is also used to determine the
6530 /// annotation's color.
6531 #[cfg(debug_assertions)]
6532 #[track_caller]
6533 pub fn debug_with_key<K, R, V>(&self, key: &K, ranges: &R, value: V)
6534 where
6535 K: std::hash::Hash + 'static,
6536 R: debug::ToMultiBufferDebugRanges,
6537 V: std::fmt::Debug,
6538 {
6539 let text_ranges = ranges
6540 .to_multi_buffer_debug_ranges(self)
6541 .into_iter()
6542 .flat_map(|range| {
6543 self.range_to_buffer_ranges(range)
6544 .into_iter()
6545 .map(|(buffer_snapshot, range, _)| {
6546 buffer_snapshot.anchor_after(range.start)
6547 ..buffer_snapshot.anchor_before(range.end)
6548 })
6549 })
6550 .collect();
6551 text::debug::GlobalDebugRanges::with_locked(|debug_ranges| {
6552 debug_ranges.insert(key, text_ranges, format!("{value:?}").into())
6553 });
6554 }
6555
6556 fn excerpt_edits_for_diff_change(
6557 &self,
6558 path: &PathKey,
6559 diff_change_range: Range<usize>,
6560 ) -> Vec<Edit<ExcerptDimension<MultiBufferOffset>>> {
6561 let mut excerpt_edits = Vec::new();
6562 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
6563 cursor.seek(path, Bias::Left);
6564 while let Some(excerpt) = cursor.item()
6565 && &excerpt.path_key == path
6566 {
6567 let buffer_snapshot = excerpt.buffer_snapshot(self);
6568 let excerpt_buffer_range = excerpt.range.context.to_offset(buffer_snapshot);
6569 let excerpt_start = cursor.start().clone();
6570 let excerpt_len = excerpt.text_summary.len;
6571 cursor.next();
6572 if diff_change_range.end < excerpt_buffer_range.start
6573 || diff_change_range.start > excerpt_buffer_range.end
6574 {
6575 continue;
6576 }
6577 let diff_change_start_in_excerpt = diff_change_range
6578 .start
6579 .saturating_sub(excerpt_buffer_range.start);
6580 let diff_change_end_in_excerpt = diff_change_range
6581 .end
6582 .saturating_sub(excerpt_buffer_range.start);
6583 let edit_start = excerpt_start.len() + diff_change_start_in_excerpt.min(excerpt_len);
6584 let edit_end = excerpt_start.len() + diff_change_end_in_excerpt.min(excerpt_len);
6585 excerpt_edits.push(Edit {
6586 old: edit_start..edit_end,
6587 new: edit_start..edit_end,
6588 });
6589 }
6590 excerpt_edits
6591 }
6592
6593 fn excerpts_for_path<'a>(
6594 &'a self,
6595 path_key: &'a PathKey,
6596 ) -> impl Iterator<Item = ExcerptRange<text::Anchor>> + 'a {
6597 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
6598 cursor.seek(path_key, Bias::Left);
6599 cursor
6600 .take_while(move |item| &item.path_key == path_key)
6601 .map(|excerpt| excerpt.range.clone())
6602 }
6603
6604 /// If the given multibuffer range is contained in a single excerpt and contains no deleted hunks,
6605 /// returns the corresponding buffer range.
6606 ///
6607 /// Otherwise, returns None.
6608 pub fn range_to_buffer_range<MBD>(
6609 &self,
6610 range: Range<MBD>,
6611 ) -> Option<(&BufferSnapshot, Range<MBD::TextDimension>)>
6612 where
6613 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
6614 MBD::TextDimension: AddAssign<<MBD as Sub>::Output>,
6615 {
6616 let mut cursor = self.cursor::<MBD, MBD::TextDimension>();
6617 cursor.seek(&range.start);
6618
6619 let start_region = cursor.region()?.clone();
6620
6621 while let Some(region) = cursor.region()
6622 && region.range.end < range.end
6623 {
6624 if !region.is_main_buffer {
6625 return None;
6626 }
6627 cursor.next();
6628 }
6629
6630 let end_region = cursor.region()?;
6631 if end_region.buffer.remote_id() != start_region.buffer.remote_id() {
6632 return None;
6633 }
6634
6635 let mut buffer_start = start_region.buffer_range.start;
6636 buffer_start += range.start - start_region.range.start;
6637 let mut buffer_end = end_region.buffer_range.start;
6638 buffer_end += range.end - end_region.range.start;
6639
6640 Some((start_region.buffer, buffer_start..buffer_end))
6641 }
6642
6643 /// If the two endpoints of the range lie in the same excerpt, return the corresponding
6644 /// buffer range. Intervening deleted hunks are allowed.
6645 pub fn anchor_range_to_buffer_anchor_range(
6646 &self,
6647 range: Range<Anchor>,
6648 ) -> Option<(&BufferSnapshot, Range<text::Anchor>)> {
6649 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
6650 cursor.seek(&range.start.seek_target(&self), Bias::Left);
6651
6652 let start_excerpt = cursor.item()?;
6653
6654 let snapshot = start_excerpt.buffer_snapshot(&self);
6655
6656 cursor.seek(&range.end.seek_target(&self), Bias::Left);
6657
6658 let end_excerpt = cursor.item()?;
6659
6660 if start_excerpt != end_excerpt {
6661 return None;
6662 }
6663
6664 if let Anchor::Excerpt(excerpt_anchor) = range.start
6665 && (excerpt_anchor.path != start_excerpt.path_key_index
6666 || excerpt_anchor.buffer_id() != snapshot.remote_id())
6667 {
6668 return None;
6669 }
6670 if let Anchor::Excerpt(excerpt_anchor) = range.end
6671 && (excerpt_anchor.path != end_excerpt.path_key_index
6672 || excerpt_anchor.buffer_id() != snapshot.remote_id())
6673 {
6674 return None;
6675 }
6676
6677 Some((
6678 snapshot,
6679 range.start.text_anchor_in(snapshot)..range.end.text_anchor_in(snapshot),
6680 ))
6681 }
6682
6683 /// Returns all nonempty intersections of the given buffer range with excerpts in the multibuffer in order.
6684 ///
6685 /// The multibuffer ranges are split to not intersect deleted hunks.
6686 pub fn buffer_range_to_excerpt_ranges(
6687 &self,
6688 range: Range<text::Anchor>,
6689 ) -> impl Iterator<Item = Range<Anchor>> {
6690 assert!(range.start.buffer_id == range.end.buffer_id);
6691
6692 let buffer_id = range.start.buffer_id;
6693 self.buffers
6694 .get(&buffer_id)
6695 .map(|buffer_state_snapshot| {
6696 let path_key_index = buffer_state_snapshot.path_key_index;
6697 let buffer_snapshot = &buffer_state_snapshot.buffer_snapshot;
6698 let buffer_range = range.to_offset(buffer_snapshot);
6699
6700 let start = Anchor::in_buffer(path_key_index, range.start).to_offset(self);
6701 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
6702 cursor.seek(&start);
6703 std::iter::from_fn(move || {
6704 while let Some(region) = cursor.region()
6705 && !region.is_main_buffer
6706 {
6707 cursor.next();
6708 }
6709
6710 let region = cursor.region()?;
6711 if region.buffer.remote_id() != buffer_id
6712 || region.buffer_range.start > BufferOffset(buffer_range.end)
6713 {
6714 return None;
6715 }
6716
6717 let start = region
6718 .buffer_range
6719 .start
6720 .max(BufferOffset(buffer_range.start));
6721 let mut end = region.buffer_range.end.min(BufferOffset(buffer_range.end));
6722
6723 cursor.next();
6724 while let Some(region) = cursor.region()
6725 && region.is_main_buffer
6726 && region.buffer.remote_id() == buffer_id
6727 && region.buffer_range.start <= end
6728 {
6729 end = end
6730 .max(region.buffer_range.end)
6731 .min(BufferOffset(buffer_range.end));
6732 cursor.next();
6733 }
6734
6735 let multibuffer_range = Anchor::range_in_buffer(
6736 path_key_index,
6737 buffer_snapshot.anchor_range_inside(start..end),
6738 );
6739 Some(multibuffer_range)
6740 })
6741 })
6742 .into_iter()
6743 .flatten()
6744 }
6745
6746 pub fn buffers_with_paths<'a>(
6747 &'a self,
6748 ) -> impl 'a + Iterator<Item = (&'a BufferSnapshot, &'a PathKey)> {
6749 self.buffers
6750 .values()
6751 .map(|buffer| (&buffer.buffer_snapshot, &buffer.path_key))
6752 }
6753
6754 /// Returns the number of graphemes in `range`.
6755 ///
6756 /// This counts user-visible characters like `e\u{301}` as one.
6757 pub fn grapheme_count_for_range(&self, range: &Range<MultiBufferOffset>) -> usize {
6758 self.text_for_range(range.clone())
6759 .collect::<String>()
6760 .graphemes(true)
6761 .count()
6762 }
6763
6764 pub fn range_for_buffer(&self, buffer_id: BufferId) -> Option<Range<Point>> {
6765 let path_key = self.path_key_index_for_buffer(buffer_id)?;
6766 let start = Anchor::in_buffer(path_key, text::Anchor::min_for_buffer(buffer_id));
6767 let end = Anchor::in_buffer(path_key, text::Anchor::max_for_buffer(buffer_id));
6768 Some((start..end).to_point(self))
6769 }
6770}
6771
6772#[cfg(any(test, feature = "test-support"))]
6773impl MultiBufferSnapshot {
6774 pub fn random_byte_range(
6775 &self,
6776 start_offset: MultiBufferOffset,
6777 rng: &mut impl rand::Rng,
6778 ) -> Range<MultiBufferOffset> {
6779 let end = self.clip_offset(rng.random_range(start_offset..=self.len()), Bias::Right);
6780 let start = self.clip_offset(rng.random_range(start_offset..=end), Bias::Right);
6781 start..end
6782 }
6783
6784 #[cfg(any(test, feature = "test-support"))]
6785 fn check_invariants(&self) {
6786 let excerpts = self.excerpts.items(());
6787
6788 let mut all_buffer_path_keys = HashSet::default();
6789 for buffer in self.buffers.values() {
6790 let path_key = buffer.path_key.clone();
6791 assert!(
6792 all_buffer_path_keys.insert(path_key),
6793 "path key reused for multiple buffers: {:#?}",
6794 self.buffers
6795 );
6796 }
6797
6798 let all_excerpt_path_keys = HashSet::from_iter(excerpts.iter().map(|e| e.path_key.clone()));
6799
6800 for (ix, excerpt) in excerpts.iter().enumerate() {
6801 if ix > 0 {
6802 let prev = &excerpts[ix - 1];
6803
6804 if excerpt.path_key < prev.path_key {
6805 panic!("excerpt path_keys are out-of-order: {:#?}", excerpts);
6806 } else if excerpt.path_key == prev.path_key {
6807 assert_eq!(
6808 excerpt.buffer_id, prev.buffer_id,
6809 "excerpts with same path_key have different buffer_ids: {:#?}",
6810 excerpts
6811 );
6812 if excerpt
6813 .start_anchor()
6814 .cmp(&prev.end_anchor(), &self)
6815 .is_le()
6816 {
6817 panic!("excerpt anchors are out-of-order: {:#?}", excerpts);
6818 }
6819 if excerpt
6820 .start_anchor()
6821 .cmp(&excerpt.end_anchor(), &self)
6822 .is_ge()
6823 {
6824 panic!("excerpt with backward range: {:#?}", excerpts);
6825 }
6826 }
6827 }
6828
6829 if ix < excerpts.len() - 1 {
6830 assert!(
6831 excerpt.has_trailing_newline,
6832 "non-trailing excerpt has no trailing newline: {:#?}",
6833 excerpts
6834 );
6835 } else {
6836 assert!(
6837 !excerpt.has_trailing_newline,
6838 "trailing excerpt has trailing newline: {:#?}",
6839 excerpts
6840 );
6841 }
6842 assert!(
6843 all_buffer_path_keys.contains(&excerpt.path_key),
6844 "excerpt path key not found in active path keys: {:#?}",
6845 excerpt.path_key
6846 );
6847 assert_eq!(
6848 self.path_keys_by_index.get(&excerpt.path_key_index),
6849 Some(&excerpt.path_key),
6850 "excerpt path key index does not match path key: {:#?}",
6851 excerpt.path_key,
6852 );
6853 }
6854 assert_eq!(all_buffer_path_keys, all_excerpt_path_keys);
6855
6856 if self.diff_transforms.summary().input != self.excerpts.summary().text {
6857 panic!(
6858 "incorrect input summary. expected {:?}, got {:?}. transforms: {:+?}",
6859 self.excerpts.summary().text,
6860 self.diff_transforms.summary().input,
6861 self.diff_transforms.items(()),
6862 );
6863 }
6864
6865 let mut prev_transform: Option<&DiffTransform> = None;
6866 for item in self.diff_transforms.iter() {
6867 if let DiffTransform::BufferContent {
6868 summary,
6869 inserted_hunk_info,
6870 } = item
6871 {
6872 if let Some(DiffTransform::BufferContent {
6873 inserted_hunk_info: prev_inserted_hunk_info,
6874 ..
6875 }) = prev_transform
6876 && *inserted_hunk_info == *prev_inserted_hunk_info
6877 {
6878 panic!(
6879 "multiple adjacent buffer content transforms with is_inserted_hunk = {inserted_hunk_info:?}. transforms: {:+?}",
6880 self.diff_transforms.items(())
6881 );
6882 }
6883 if summary.len == MultiBufferOffset(0) && !self.is_empty() {
6884 panic!("empty buffer content transform");
6885 }
6886 }
6887 prev_transform = Some(item);
6888 }
6889 }
6890}
6891
6892impl<'a, MBD, BD> MultiBufferCursor<'a, MBD, BD>
6893where
6894 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
6895 BD: TextDimension + AddAssign<<MBD as Sub>::Output>,
6896{
6897 #[instrument(skip_all)]
6898 fn seek(&mut self, position: &MBD) {
6899 let position = OutputDimension(*position);
6900 self.cached_region.take();
6901 self.diff_transforms.seek(&position, Bias::Right);
6902 if self.diff_transforms.item().is_none()
6903 && self.diff_transforms.start().output_dimension == position
6904 {
6905 self.diff_transforms.prev();
6906 }
6907
6908 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension;
6909 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6910 let overshoot = position - self.diff_transforms.start().output_dimension;
6911 excerpt_position += overshoot;
6912 }
6913
6914 self.excerpts.seek(&excerpt_position, Bias::Right);
6915 if self.excerpts.item().is_none() && excerpt_position == *self.excerpts.start() {
6916 self.excerpts.prev();
6917 }
6918 }
6919
6920 fn seek_forward(&mut self, position: &MBD) {
6921 let position = OutputDimension(*position);
6922 self.cached_region.take();
6923 self.diff_transforms.seek_forward(&position, Bias::Right);
6924 if self.diff_transforms.item().is_none()
6925 && self.diff_transforms.start().output_dimension == position
6926 {
6927 self.diff_transforms.prev();
6928 }
6929
6930 let overshoot = position - self.diff_transforms.start().output_dimension;
6931 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension;
6932 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6933 excerpt_position += overshoot;
6934 }
6935
6936 self.excerpts.seek_forward(&excerpt_position, Bias::Right);
6937 if self.excerpts.item().is_none() && excerpt_position == *self.excerpts.start() {
6938 self.excerpts.prev();
6939 }
6940 }
6941
6942 fn next_excerpt(&mut self) {
6943 self.excerpts.next();
6944 self.seek_to_start_of_current_excerpt();
6945 }
6946
6947 fn prev_excerpt(&mut self) {
6948 self.excerpts.prev();
6949 self.seek_to_start_of_current_excerpt();
6950 }
6951
6952 fn seek_to_start_of_current_excerpt(&mut self) {
6953 self.cached_region.take();
6954
6955 if self.diff_transforms.seek(self.excerpts.start(), Bias::Left)
6956 && self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6957 && self.diff_transforms.next_item().is_some()
6958 {
6959 self.diff_transforms.next();
6960 }
6961 }
6962
6963 fn next_excerpt_forwards(&mut self) {
6964 self.excerpts.next();
6965 self.seek_to_start_of_current_excerpt_forward();
6966 }
6967
6968 fn seek_to_start_of_current_excerpt_forward(&mut self) {
6969 self.cached_region.take();
6970
6971 if self
6972 .diff_transforms
6973 .seek_forward(self.excerpts.start(), Bias::Left)
6974 && self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6975 && self.diff_transforms.next_item().is_some()
6976 {
6977 self.diff_transforms.next();
6978 }
6979 }
6980
6981 fn next(&mut self) {
6982 self.cached_region.take();
6983 match self
6984 .diff_transforms
6985 .end()
6986 .excerpt_dimension
6987 .cmp(&self.excerpts.end())
6988 {
6989 cmp::Ordering::Less => self.diff_transforms.next(),
6990 cmp::Ordering::Greater => self.excerpts.next(),
6991 cmp::Ordering::Equal => {
6992 self.diff_transforms.next();
6993 if self.diff_transforms.end().excerpt_dimension > self.excerpts.end()
6994 || self.diff_transforms.item().is_none()
6995 {
6996 self.excerpts.next();
6997 } else if let Some(DiffTransform::DeletedHunk { hunk_info, .. }) =
6998 self.diff_transforms.item()
6999 && self
7000 .excerpts
7001 .item()
7002 .is_some_and(|excerpt| excerpt.end_anchor() != hunk_info.excerpt_end)
7003 {
7004 self.excerpts.next();
7005 }
7006 }
7007 }
7008 }
7009
7010 fn prev(&mut self) {
7011 self.cached_region.take();
7012 match self
7013 .diff_transforms
7014 .start()
7015 .excerpt_dimension
7016 .cmp(self.excerpts.start())
7017 {
7018 cmp::Ordering::Less => self.excerpts.prev(),
7019 cmp::Ordering::Greater => self.diff_transforms.prev(),
7020 cmp::Ordering::Equal => {
7021 self.diff_transforms.prev();
7022 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
7023 || self.diff_transforms.item().is_none()
7024 {
7025 self.excerpts.prev();
7026 }
7027 }
7028 }
7029 }
7030
7031 fn region(&self) -> Option<&MultiBufferRegion<'a, MBD, BD>> {
7032 self.cached_region
7033 .get_or_init(|| self.build_region())
7034 .as_ref()
7035 }
7036
7037 fn is_at_start_of_excerpt(&mut self) -> bool {
7038 if self.diff_transforms.start().excerpt_dimension > *self.excerpts.start() {
7039 return false;
7040 } else if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
7041 return true;
7042 }
7043
7044 self.diff_transforms.prev();
7045 let prev_transform = self.diff_transforms.item();
7046 self.diff_transforms.next();
7047
7048 prev_transform.is_none_or(|next_transform| {
7049 matches!(next_transform, DiffTransform::BufferContent { .. })
7050 })
7051 }
7052
7053 fn is_at_end_of_excerpt(&self) -> bool {
7054 if self.diff_transforms.end().excerpt_dimension < self.excerpts.end() {
7055 return false;
7056 } else if self.diff_transforms.end().excerpt_dimension > self.excerpts.end()
7057 || self.diff_transforms.item().is_none()
7058 {
7059 return true;
7060 }
7061
7062 let next_transform = self.diff_transforms.next_item();
7063 next_transform.is_none_or(|next_transform| match next_transform {
7064 DiffTransform::BufferContent { .. } => true,
7065 DiffTransform::DeletedHunk { hunk_info, .. } => self
7066 .excerpts
7067 .item()
7068 .is_some_and(|excerpt| excerpt.end_anchor() != hunk_info.excerpt_end),
7069 })
7070 }
7071
7072 fn main_buffer_position(&self) -> Option<BD> {
7073 let excerpt = self.excerpts.item()?;
7074 let buffer = excerpt.buffer_snapshot(self.snapshot);
7075 let buffer_context_start = excerpt.range.context.start.summary::<BD>(buffer);
7076 let mut buffer_start = buffer_context_start;
7077 let overshoot = self.diff_transforms.end().excerpt_dimension - *self.excerpts.start();
7078 buffer_start += overshoot;
7079 Some(buffer_start)
7080 }
7081
7082 fn buffer_position_at(&self, output_position: &MBD) -> Option<BD> {
7083 let excerpt = self.excerpts.item()?;
7084 let buffer = excerpt.buffer_snapshot(self.snapshot);
7085 let buffer_context_start = excerpt.range.context.start.summary::<BD>(buffer);
7086 let mut excerpt_offset = self.diff_transforms.start().excerpt_dimension;
7087 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7088 excerpt_offset += *output_position - self.diff_transforms.start().output_dimension.0;
7089 }
7090 let mut result = buffer_context_start;
7091 result += excerpt_offset - *self.excerpts.start();
7092 Some(result)
7093 }
7094
7095 fn build_region(&self) -> Option<MultiBufferRegion<'a, MBD, BD>> {
7096 let excerpt = self.excerpts.item()?;
7097 match self.diff_transforms.item()? {
7098 DiffTransform::DeletedHunk {
7099 buffer_id,
7100 base_text_byte_range,
7101 has_trailing_newline,
7102 hunk_info,
7103 ..
7104 } => {
7105 let diff = find_diff_state(&self.snapshot.diffs, *buffer_id)?;
7106 let buffer = diff.base_text();
7107 let mut rope_cursor = buffer.as_rope().cursor(0);
7108 let buffer_start = rope_cursor.summary::<BD>(base_text_byte_range.start);
7109 let buffer_range_len = rope_cursor.summary::<BD>(base_text_byte_range.end);
7110 let mut buffer_end = buffer_start;
7111 TextDimension::add_assign(&mut buffer_end, &buffer_range_len);
7112 let start = self.diff_transforms.start().output_dimension.0;
7113 let end = self.diff_transforms.end().output_dimension.0;
7114 Some(MultiBufferRegion {
7115 buffer,
7116 excerpt,
7117 has_trailing_newline: *has_trailing_newline,
7118 is_main_buffer: false,
7119 diff_hunk_status: Some(DiffHunkStatus::deleted(
7120 hunk_info.hunk_secondary_status,
7121 )),
7122 buffer_range: buffer_start..buffer_end,
7123 range: start..end,
7124 })
7125 }
7126 DiffTransform::BufferContent {
7127 inserted_hunk_info, ..
7128 } => {
7129 let buffer = excerpt.buffer_snapshot(self.snapshot);
7130 let buffer_context_start = excerpt.range.context.start.summary::<BD>(buffer);
7131
7132 let mut start = self.diff_transforms.start().output_dimension.0;
7133 let mut buffer_start = buffer_context_start;
7134 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
7135 let overshoot =
7136 *self.excerpts.start() - self.diff_transforms.start().excerpt_dimension;
7137 start += overshoot;
7138 } else {
7139 let overshoot =
7140 self.diff_transforms.start().excerpt_dimension - *self.excerpts.start();
7141 buffer_start += overshoot;
7142 }
7143
7144 let mut end;
7145 let mut buffer_end;
7146 let has_trailing_newline;
7147 let transform_end = self.diff_transforms.end();
7148 if transform_end.excerpt_dimension < self.excerpts.end() {
7149 let overshoot = transform_end.excerpt_dimension - *self.excerpts.start();
7150 end = transform_end.output_dimension.0;
7151 buffer_end = buffer_context_start;
7152 buffer_end += overshoot;
7153 has_trailing_newline = false;
7154 } else {
7155 let overshoot =
7156 self.excerpts.end() - self.diff_transforms.start().excerpt_dimension;
7157 end = self.diff_transforms.start().output_dimension.0;
7158 end += overshoot;
7159 buffer_end = excerpt.range.context.end.summary::<BD>(buffer);
7160 has_trailing_newline = excerpt.has_trailing_newline;
7161 };
7162
7163 let diff_hunk_status = inserted_hunk_info.map(|info| {
7164 if info.is_logically_deleted {
7165 DiffHunkStatus::deleted(info.hunk_secondary_status)
7166 } else {
7167 DiffHunkStatus::added(info.hunk_secondary_status)
7168 }
7169 });
7170
7171 Some(MultiBufferRegion {
7172 buffer,
7173 excerpt,
7174 has_trailing_newline,
7175 is_main_buffer: true,
7176 diff_hunk_status,
7177 buffer_range: buffer_start..buffer_end,
7178 range: start..end,
7179 })
7180 }
7181 }
7182 }
7183
7184 fn fetch_excerpt_with_range(&self) -> Option<(&'a Excerpt, Range<MBD>)> {
7185 let excerpt = self.excerpts.item()?;
7186 match self.diff_transforms.item()? {
7187 &DiffTransform::DeletedHunk { .. } => {
7188 let start = self.diff_transforms.start().output_dimension.0;
7189 let end = self.diff_transforms.end().output_dimension.0;
7190 Some((excerpt, start..end))
7191 }
7192 DiffTransform::BufferContent { .. } => {
7193 let mut start = self.diff_transforms.start().output_dimension.0;
7194 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
7195 let overshoot =
7196 *self.excerpts.start() - self.diff_transforms.start().excerpt_dimension;
7197 start += overshoot;
7198 }
7199
7200 let mut end;
7201 let transform_end = self.diff_transforms.end();
7202 if transform_end.excerpt_dimension < self.excerpts.end() {
7203 end = transform_end.output_dimension.0;
7204 } else {
7205 let overshoot =
7206 self.excerpts.end() - self.diff_transforms.start().excerpt_dimension;
7207 end = self.diff_transforms.start().output_dimension.0;
7208 end += overshoot;
7209 };
7210
7211 Some((excerpt, start..end))
7212 }
7213 }
7214 }
7215
7216 fn excerpt(&self) -> Option<&'a Excerpt> {
7217 self.excerpts.item()
7218 }
7219}
7220
7221impl Excerpt {
7222 fn new(
7223 path_key: PathKey,
7224 path_key_index: PathKeyIndex,
7225 buffer_snapshot: &BufferSnapshot,
7226 range: ExcerptRange<text::Anchor>,
7227 has_trailing_newline: bool,
7228 ) -> Self {
7229 Excerpt {
7230 path_key,
7231 path_key_index,
7232 buffer_id: buffer_snapshot.remote_id(),
7233 max_buffer_row: range.context.end.to_point(&buffer_snapshot).row,
7234 text_summary: buffer_snapshot.text_summary_for_range::<TextSummary, _>(
7235 range.context.to_offset(&buffer_snapshot),
7236 ),
7237 range,
7238 has_trailing_newline,
7239 }
7240 }
7241
7242 fn buffer_snapshot<'a>(&self, snapshot: &'a MultiBufferSnapshot) -> &'a BufferSnapshot {
7243 &snapshot
7244 .buffers
7245 .get(&self.buffer_id)
7246 .expect("buffer snapshot not found for excerpt")
7247 .buffer_snapshot
7248 }
7249
7250 fn buffer(&self, multibuffer: &MultiBuffer) -> Entity<Buffer> {
7251 multibuffer
7252 .buffer(self.buffer_id)
7253 .expect("buffer entity not found for excerpt")
7254 }
7255
7256 fn chunks_in_range<'a>(
7257 &'a self,
7258 range: Range<usize>,
7259 language_aware: LanguageAwareStyling,
7260 snapshot: &'a MultiBufferSnapshot,
7261 ) -> ExcerptChunks<'a> {
7262 let buffer = self.buffer_snapshot(snapshot);
7263 let content_start = self.range.context.start.to_offset(buffer);
7264 let chunks_start = content_start + range.start;
7265 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
7266
7267 let has_footer = self.has_trailing_newline
7268 && range.start <= self.text_summary.len
7269 && range.end > self.text_summary.len;
7270
7271 let content_chunks = buffer.chunks(chunks_start..chunks_end, language_aware);
7272
7273 ExcerptChunks {
7274 content_chunks,
7275 has_footer,
7276 end: self.end_anchor(),
7277 }
7278 }
7279
7280 fn seek_chunks(
7281 &self,
7282 excerpt_chunks: &mut ExcerptChunks,
7283 range: Range<usize>,
7284 snapshot: &MultiBufferSnapshot,
7285 ) {
7286 let buffer = self.buffer_snapshot(snapshot);
7287 let content_start = self.range.context.start.to_offset(buffer);
7288 let chunks_start = content_start + range.start;
7289 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
7290 excerpt_chunks.content_chunks.seek(chunks_start..chunks_end);
7291 excerpt_chunks.has_footer = self.has_trailing_newline
7292 && range.start <= self.text_summary.len
7293 && range.end > self.text_summary.len;
7294 }
7295
7296 fn clip_anchor(
7297 &self,
7298 text_anchor: text::Anchor,
7299 snapshot: &MultiBufferSnapshot,
7300 ) -> text::Anchor {
7301 let buffer = self.buffer_snapshot(snapshot);
7302 if text_anchor.cmp(&self.range.context.start, buffer).is_lt() {
7303 self.range.context.start
7304 } else if text_anchor.cmp(&self.range.context.end, buffer).is_gt() {
7305 self.range.context.end
7306 } else {
7307 text_anchor
7308 }
7309 }
7310
7311 pub(crate) fn contains(&self, anchor: &ExcerptAnchor, snapshot: &MultiBufferSnapshot) -> bool {
7312 self.path_key_index == anchor.path
7313 && self.buffer_id == anchor.text_anchor.buffer_id
7314 && self
7315 .range
7316 .contains(&anchor.text_anchor(), self.buffer_snapshot(snapshot))
7317 }
7318
7319 fn start_anchor(&self) -> ExcerptAnchor {
7320 ExcerptAnchor::in_buffer(self.path_key_index, self.range.context.start)
7321 }
7322
7323 fn end_anchor(&self) -> ExcerptAnchor {
7324 ExcerptAnchor::in_buffer(self.path_key_index, self.range.context.end)
7325 }
7326}
7327
7328impl PartialEq for Excerpt {
7329 fn eq(&self, other: &Self) -> bool {
7330 self.path_key_index == other.path_key_index
7331 && self.buffer_id == other.buffer_id
7332 && self.range.context == other.range.context
7333 }
7334}
7335
7336impl sum_tree::Item for Excerpt {
7337 type Summary = ExcerptSummary;
7338
7339 fn summary(&self, _cx: ()) -> Self::Summary {
7340 let mut text = self.text_summary;
7341 if self.has_trailing_newline {
7342 text += TextSummary::from("\n");
7343 }
7344 ExcerptSummary {
7345 path_key: self.path_key.clone(),
7346 path_key_index: Some(self.path_key_index),
7347 max_anchor: Some(self.range.context.end),
7348 widest_line_number: self.max_buffer_row,
7349 text: text.into(),
7350 count: 1,
7351 }
7352 }
7353}
7354
7355impl DiffTransform {
7356 fn hunk_info(&self) -> Option<DiffTransformHunkInfo> {
7357 match self {
7358 DiffTransform::DeletedHunk { hunk_info, .. } => Some(*hunk_info),
7359 DiffTransform::BufferContent {
7360 inserted_hunk_info, ..
7361 } => *inserted_hunk_info,
7362 }
7363 }
7364}
7365
7366impl sum_tree::Item for DiffTransform {
7367 type Summary = DiffTransformSummary;
7368
7369 fn summary(&self, _: <Self::Summary as sum_tree::Summary>::Context<'_>) -> Self::Summary {
7370 match self {
7371 DiffTransform::BufferContent { summary, .. } => DiffTransformSummary {
7372 input: *summary,
7373 output: *summary,
7374 },
7375 &DiffTransform::DeletedHunk { summary, .. } => DiffTransformSummary {
7376 input: MBTextSummary::default(),
7377 output: summary.into(),
7378 },
7379 }
7380 }
7381}
7382
7383impl DiffTransformSummary {
7384 fn excerpt_len(&self) -> ExcerptOffset {
7385 ExcerptDimension(self.input.len)
7386 }
7387}
7388
7389impl sum_tree::ContextLessSummary for DiffTransformSummary {
7390 fn zero() -> Self {
7391 DiffTransformSummary {
7392 input: MBTextSummary::default(),
7393 output: MBTextSummary::default(),
7394 }
7395 }
7396
7397 fn add_summary(&mut self, other: &Self) {
7398 self.input += other.input;
7399 self.output += other.output;
7400 }
7401}
7402
7403impl sum_tree::Dimension<'_, ExcerptSummary> for PathKey {
7404 fn zero(_: <ExcerptSummary as sum_tree::Summary>::Context<'_>) -> Self {
7405 PathKey::min()
7406 }
7407
7408 fn add_summary(
7409 &mut self,
7410 summary: &'_ ExcerptSummary,
7411 _cx: <ExcerptSummary as sum_tree::Summary>::Context<'_>,
7412 ) {
7413 *self = summary.path_key.clone();
7414 }
7415}
7416
7417impl sum_tree::Dimension<'_, ExcerptSummary> for MultiBufferOffset {
7418 fn zero(_: <ExcerptSummary as sum_tree::Summary>::Context<'_>) -> Self {
7419 MultiBufferOffset::ZERO
7420 }
7421
7422 fn add_summary(
7423 &mut self,
7424 summary: &'_ ExcerptSummary,
7425 _cx: <ExcerptSummary as sum_tree::Summary>::Context<'_>,
7426 ) {
7427 *self += summary.text.len
7428 }
7429}
7430
7431impl sum_tree::ContextLessSummary for ExcerptSummary {
7432 fn zero() -> Self {
7433 Self::min()
7434 }
7435
7436 fn add_summary(&mut self, summary: &Self) {
7437 debug_assert!(
7438 summary.path_key >= self.path_key,
7439 "Path keys must be in ascending order: {:?} > {:?}",
7440 summary.path_key,
7441 self.path_key
7442 );
7443
7444 self.path_key = summary.path_key.clone();
7445 self.path_key_index = summary.path_key_index;
7446 self.max_anchor = summary.max_anchor;
7447 self.text += summary.text;
7448 self.widest_line_number = cmp::max(self.widest_line_number, summary.widest_line_number);
7449 self.count += summary.count;
7450 }
7451}
7452
7453impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for AnchorSeekTarget<'_> {
7454 fn cmp(
7455 &self,
7456 cursor_location: &ExcerptSummary,
7457 _cx: <ExcerptSummary as sum_tree::Summary>::Context<'_>,
7458 ) -> cmp::Ordering {
7459 match self {
7460 AnchorSeekTarget::Missing { path_key } => {
7461 // Want to end up after any excerpts for (a different buffer at) the original path
7462 match Ord::cmp(*path_key, &cursor_location.path_key) {
7463 Ordering::Less => Ordering::Less,
7464 Ordering::Equal | Ordering::Greater => Ordering::Greater,
7465 }
7466 }
7467 AnchorSeekTarget::Excerpt {
7468 path_key,
7469 path_key_index,
7470 anchor,
7471 snapshot,
7472 } => {
7473 if Some(*path_key_index) != cursor_location.path_key_index {
7474 Ord::cmp(*path_key, &cursor_location.path_key)
7475 } else if let Some(max_anchor) = cursor_location.max_anchor {
7476 debug_assert_eq!(max_anchor.buffer_id, snapshot.remote_id());
7477 anchor.cmp(&max_anchor, snapshot)
7478 } else {
7479 Ordering::Greater
7480 }
7481 }
7482 AnchorSeekTarget::Empty => Ordering::Greater,
7483 }
7484 }
7485}
7486
7487impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for PathKey {
7488 fn cmp(
7489 &self,
7490 cursor_location: &ExcerptSummary,
7491 _cx: <ExcerptSummary as sum_tree::Summary>::Context<'_>,
7492 ) -> cmp::Ordering {
7493 Ord::cmp(self, &cursor_location.path_key)
7494 }
7495}
7496
7497impl<'a, MBD> sum_tree::Dimension<'a, ExcerptSummary> for ExcerptDimension<MBD>
7498where
7499 MBD: MultiBufferDimension + Default,
7500{
7501 fn zero(_: ()) -> Self {
7502 ExcerptDimension(MBD::default())
7503 }
7504
7505 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: ()) {
7506 MultiBufferDimension::add_mb_text_summary(&mut self.0, &summary.text)
7507 }
7508}
7509
7510#[derive(Copy, Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7511struct OutputDimension<T>(T);
7512
7513impl<T: PartialEq> PartialEq<T> for OutputDimension<T> {
7514 fn eq(&self, other: &T) -> bool {
7515 self.0 == *other
7516 }
7517}
7518
7519impl<T: PartialOrd> PartialOrd<T> for OutputDimension<T> {
7520 fn partial_cmp(&self, other: &T) -> Option<cmp::Ordering> {
7521 self.0.partial_cmp(other)
7522 }
7523}
7524
7525impl<R, T, U> ops::Sub<OutputDimension<U>> for OutputDimension<T>
7526where
7527 T: ops::Sub<U, Output = R>,
7528{
7529 type Output = R;
7530
7531 fn sub(self, other: OutputDimension<U>) -> Self::Output {
7532 self.0 - other.0
7533 }
7534}
7535
7536impl<R, T, U> ops::Add<U> for OutputDimension<T>
7537where
7538 T: ops::Add<U, Output = R>,
7539{
7540 type Output = OutputDimension<R>;
7541
7542 fn add(self, other: U) -> Self::Output {
7543 OutputDimension(self.0 + other)
7544 }
7545}
7546
7547impl<T, U> AddAssign<U> for OutputDimension<T>
7548where
7549 T: AddAssign<U>,
7550{
7551 fn add_assign(&mut self, other: U) {
7552 self.0 += other;
7553 }
7554}
7555
7556impl<T, U> SubAssign<U> for OutputDimension<T>
7557where
7558 T: SubAssign<U>,
7559{
7560 fn sub_assign(&mut self, other: U) {
7561 self.0 -= other;
7562 }
7563}
7564
7565#[derive(Copy, Clone, PartialOrd, Ord, Eq, PartialEq, Debug, Default)]
7566struct ExcerptDimension<T>(T);
7567
7568impl<T: PartialEq> PartialEq<T> for ExcerptDimension<T> {
7569 fn eq(&self, other: &T) -> bool {
7570 self.0 == *other
7571 }
7572}
7573
7574impl<T: PartialOrd> PartialOrd<T> for ExcerptDimension<T> {
7575 fn partial_cmp(&self, other: &T) -> Option<cmp::Ordering> {
7576 self.0.partial_cmp(other)
7577 }
7578}
7579
7580impl ExcerptOffset {
7581 fn saturating_sub(self, other: ExcerptOffset) -> usize {
7582 self.0.saturating_sub(other.0)
7583 }
7584}
7585
7586impl<R, T, U> ops::Sub<ExcerptDimension<U>> for ExcerptDimension<T>
7587where
7588 T: ops::Sub<U, Output = R>,
7589{
7590 type Output = R;
7591
7592 fn sub(self, other: ExcerptDimension<U>) -> Self::Output {
7593 self.0 - other.0
7594 }
7595}
7596
7597impl<R, T, U> ops::Add<U> for ExcerptDimension<T>
7598where
7599 T: ops::Add<U, Output = R>,
7600{
7601 type Output = ExcerptDimension<R>;
7602
7603 fn add(self, other: U) -> Self::Output {
7604 ExcerptDimension(self.0 + other)
7605 }
7606}
7607
7608impl<T, U> AddAssign<U> for ExcerptDimension<T>
7609where
7610 T: AddAssign<U>,
7611{
7612 fn add_assign(&mut self, other: U) {
7613 self.0 += other;
7614 }
7615}
7616
7617impl<T, U> SubAssign<U> for ExcerptDimension<T>
7618where
7619 T: SubAssign<U>,
7620{
7621 fn sub_assign(&mut self, other: U) {
7622 self.0 -= other;
7623 }
7624}
7625
7626impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for MultiBufferOffset {
7627 fn zero(_: ()) -> Self {
7628 MultiBufferOffset::ZERO
7629 }
7630
7631 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: ()) {
7632 *self += summary.output.len;
7633 }
7634}
7635
7636impl<MBD> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransformSummary>
7637 for ExcerptDimension<MBD>
7638where
7639 MBD: MultiBufferDimension + Ord,
7640{
7641 fn cmp(&self, cursor_location: &DiffTransformSummary, _: ()) -> cmp::Ordering {
7642 Ord::cmp(&self.0, &MBD::from_summary(&cursor_location.input))
7643 }
7644}
7645
7646impl<'a, MBD> sum_tree::SeekTarget<'a, DiffTransformSummary, DiffTransforms<MBD>>
7647 for ExcerptDimension<MBD>
7648where
7649 MBD: MultiBufferDimension + Ord,
7650{
7651 fn cmp(&self, cursor_location: &DiffTransforms<MBD>, _: ()) -> cmp::Ordering {
7652 Ord::cmp(&self.0, &cursor_location.excerpt_dimension.0)
7653 }
7654}
7655
7656impl<'a, MBD: MultiBufferDimension> sum_tree::Dimension<'a, DiffTransformSummary>
7657 for ExcerptDimension<MBD>
7658{
7659 fn zero(_: ()) -> Self {
7660 ExcerptDimension(MBD::default())
7661 }
7662
7663 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: ()) {
7664 self.0.add_mb_text_summary(&summary.input)
7665 }
7666}
7667
7668impl<'a, MBD> sum_tree::SeekTarget<'a, DiffTransformSummary, DiffTransforms<MBD>>
7669 for OutputDimension<MBD>
7670where
7671 MBD: MultiBufferDimension + Ord,
7672{
7673 fn cmp(&self, cursor_location: &DiffTransforms<MBD>, _: ()) -> cmp::Ordering {
7674 Ord::cmp(&self.0, &cursor_location.output_dimension.0)
7675 }
7676}
7677
7678impl<'a, MBD: MultiBufferDimension> sum_tree::Dimension<'a, DiffTransformSummary>
7679 for OutputDimension<MBD>
7680{
7681 fn zero(_: ()) -> Self {
7682 OutputDimension(MBD::default())
7683 }
7684
7685 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: ()) {
7686 self.0.add_mb_text_summary(&summary.output)
7687 }
7688}
7689
7690impl MultiBufferRows<'_> {
7691 pub fn seek(&mut self, MultiBufferRow(row): MultiBufferRow) {
7692 self.point = Point::new(row, 0);
7693 self.cursor.seek(&self.point);
7694 }
7695}
7696
7697impl Iterator for MultiBufferRows<'_> {
7698 type Item = RowInfo;
7699
7700 fn next(&mut self) -> Option<Self::Item> {
7701 if self.is_empty && self.point.row == 0 {
7702 self.point += Point::new(1, 0);
7703 return Some(RowInfo {
7704 buffer_id: None,
7705 buffer_row: Some(0),
7706 multibuffer_row: Some(MultiBufferRow(0)),
7707 diff_status: None,
7708 expand_info: None,
7709 wrapped_buffer_row: None,
7710 });
7711 }
7712
7713 let mut region = self.cursor.region()?.clone();
7714 while self.point >= region.range.end {
7715 self.cursor.next();
7716 if let Some(next_region) = self.cursor.region() {
7717 region = next_region.clone();
7718 } else if self.point == self.cursor.diff_transforms.end().output_dimension.0 {
7719 let multibuffer_row = MultiBufferRow(self.point.row);
7720 let last_excerpt = self
7721 .cursor
7722 .excerpts
7723 .item()
7724 .or(self.cursor.excerpts.prev_item())?;
7725 let buffer_snapshot = last_excerpt.buffer_snapshot(self.cursor.snapshot);
7726 let last_row = last_excerpt.range.context.end.to_point(buffer_snapshot).row;
7727
7728 let first_row = last_excerpt
7729 .range
7730 .context
7731 .start
7732 .to_point(buffer_snapshot)
7733 .row;
7734
7735 let expand_info = if self.is_singleton {
7736 None
7737 } else {
7738 let needs_expand_up = first_row == last_row
7739 && last_row > 0
7740 && !region.diff_hunk_status.is_some_and(|d| d.is_deleted());
7741 let needs_expand_down = last_row < buffer_snapshot.max_point().row;
7742
7743 if needs_expand_up && needs_expand_down {
7744 Some(ExpandExcerptDirection::UpAndDown)
7745 } else if needs_expand_up {
7746 Some(ExpandExcerptDirection::Up)
7747 } else if needs_expand_down {
7748 Some(ExpandExcerptDirection::Down)
7749 } else {
7750 None
7751 }
7752 .map(|direction| ExpandInfo {
7753 direction,
7754 start_anchor: Anchor::Excerpt(last_excerpt.start_anchor()),
7755 })
7756 };
7757 self.point += Point::new(1, 0);
7758 return Some(RowInfo {
7759 buffer_id: Some(last_excerpt.buffer_id),
7760 buffer_row: Some(last_row),
7761 multibuffer_row: Some(multibuffer_row),
7762 diff_status: None,
7763 wrapped_buffer_row: None,
7764 expand_info,
7765 });
7766 } else {
7767 return None;
7768 };
7769 }
7770
7771 let overshoot = self.point - region.range.start;
7772 let buffer_point = region.buffer_range.start + overshoot;
7773 let expand_info = if self.is_singleton {
7774 None
7775 } else {
7776 let needs_expand_up = self.point.row == region.range.start.row
7777 && self.cursor.is_at_start_of_excerpt()
7778 && buffer_point.row > 0;
7779 let needs_expand_down = (region.excerpt.has_trailing_newline
7780 && self.point.row + 1 == region.range.end.row
7781 || !region.excerpt.has_trailing_newline && self.point.row == region.range.end.row)
7782 && self.cursor.is_at_end_of_excerpt()
7783 && buffer_point.row < region.buffer.max_point().row;
7784
7785 if needs_expand_up && needs_expand_down {
7786 Some(ExpandExcerptDirection::UpAndDown)
7787 } else if needs_expand_up {
7788 Some(ExpandExcerptDirection::Up)
7789 } else if needs_expand_down {
7790 Some(ExpandExcerptDirection::Down)
7791 } else {
7792 None
7793 }
7794 .map(|direction| ExpandInfo {
7795 direction,
7796 start_anchor: Anchor::Excerpt(region.excerpt.start_anchor()),
7797 })
7798 };
7799
7800 let result = Some(RowInfo {
7801 buffer_id: Some(region.buffer.remote_id()),
7802 buffer_row: Some(buffer_point.row),
7803 multibuffer_row: Some(MultiBufferRow(self.point.row)),
7804 diff_status: region
7805 .diff_hunk_status
7806 .filter(|_| self.point < region.range.end),
7807 expand_info,
7808 wrapped_buffer_row: None,
7809 });
7810 self.point += Point::new(1, 0);
7811 result
7812 }
7813}
7814
7815impl<'a> MultiBufferChunks<'a> {
7816 pub fn offset(&self) -> MultiBufferOffset {
7817 self.range.start
7818 }
7819
7820 pub fn seek(&mut self, range: Range<MultiBufferOffset>) {
7821 self.diff_transforms.seek(&range.end, Bias::Right);
7822 let mut excerpt_end = self.diff_transforms.start().1;
7823 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7824 let overshoot = range.end - self.diff_transforms.start().0;
7825 excerpt_end += overshoot;
7826 }
7827
7828 self.diff_transforms.seek(&range.start, Bias::Right);
7829 let mut excerpt_start = self.diff_transforms.start().1;
7830 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7831 let overshoot = range.start - self.diff_transforms.start().0;
7832 excerpt_start += overshoot;
7833 }
7834
7835 self.seek_to_excerpt_offset_range(excerpt_start..excerpt_end);
7836 self.buffer_chunk.take();
7837 self.range = range;
7838 }
7839
7840 fn seek_to_excerpt_offset_range(&mut self, new_range: Range<ExcerptOffset>) {
7841 self.excerpt_offset_range = new_range.clone();
7842 self.excerpts.seek(&new_range.start, Bias::Right);
7843 if let Some(excerpt) = self.excerpts.item() {
7844 let excerpt_start = *self.excerpts.start();
7845 if let Some(excerpt_chunks) = self
7846 .excerpt_chunks
7847 .as_mut()
7848 .filter(|chunks| excerpt.end_anchor() == chunks.end)
7849 {
7850 excerpt.seek_chunks(
7851 excerpt_chunks,
7852 (self.excerpt_offset_range.start - excerpt_start)
7853 ..(self.excerpt_offset_range.end - excerpt_start),
7854 self.snapshot,
7855 );
7856 } else {
7857 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7858 (self.excerpt_offset_range.start - excerpt_start)
7859 ..(self.excerpt_offset_range.end - excerpt_start),
7860 self.language_aware,
7861 self.snapshot,
7862 ));
7863 }
7864 } else {
7865 self.excerpt_chunks = None;
7866 }
7867 }
7868
7869 #[ztracing::instrument(skip_all)]
7870 fn next_excerpt_chunk(&mut self) -> Option<Chunk<'a>> {
7871 loop {
7872 if self.excerpt_offset_range.is_empty() {
7873 return None;
7874 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
7875 self.excerpt_offset_range.start += chunk.text.len();
7876 return Some(chunk);
7877 } else {
7878 self.excerpts.next();
7879 let excerpt = self.excerpts.item()?;
7880 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7881 0..(self.excerpt_offset_range.end - *self.excerpts.start()),
7882 self.language_aware,
7883 self.snapshot,
7884 ));
7885 }
7886 }
7887 }
7888}
7889
7890impl<'a> Iterator for ReversedMultiBufferChunks<'a> {
7891 type Item = &'a str;
7892
7893 fn next(&mut self) -> Option<Self::Item> {
7894 let mut region = self.cursor.region()?;
7895 if self.offset == region.range.start {
7896 self.cursor.prev();
7897 region = self.cursor.region()?;
7898 let start_overshoot = self.start.saturating_sub(region.range.start);
7899 self.current_chunks = Some(region.buffer.reversed_chunks_in_range(
7900 region.buffer_range.start + start_overshoot..region.buffer_range.end,
7901 ));
7902 }
7903
7904 if self.offset == region.range.end && region.has_trailing_newline {
7905 self.offset -= 1;
7906 Some("\n")
7907 } else {
7908 let chunk = self.current_chunks.as_mut().unwrap().next()?;
7909 self.offset -= chunk.len();
7910 Some(chunk)
7911 }
7912 }
7913}
7914
7915impl<'a> Iterator for MultiBufferChunks<'a> {
7916 type Item = Chunk<'a>;
7917
7918 #[ztracing::instrument(skip_all)]
7919 fn next(&mut self) -> Option<Chunk<'a>> {
7920 if self.range.start >= self.range.end {
7921 return None;
7922 }
7923 if self.range.start == self.diff_transforms.end().0 {
7924 self.diff_transforms.next();
7925 }
7926
7927 let diff_transform_start = self.diff_transforms.start().0;
7928 let diff_transform_end = self.diff_transforms.end().0;
7929 debug_assert!(
7930 self.range.start < diff_transform_end,
7931 "{:?} < {:?} of ({1:?}..{2:?})",
7932 self.range.start,
7933 diff_transform_end,
7934 diff_transform_start
7935 );
7936
7937 let diff_transform = self.diff_transforms.item()?;
7938 match diff_transform {
7939 DiffTransform::BufferContent { .. } => {
7940 let chunk = if let Some(chunk) = &mut self.buffer_chunk {
7941 chunk
7942 } else {
7943 let chunk = self.next_excerpt_chunk().unwrap();
7944 self.buffer_chunk.insert(chunk)
7945 };
7946
7947 let chunk_end = self.range.start + chunk.text.len();
7948 let diff_transform_end = diff_transform_end.min(self.range.end);
7949
7950 if diff_transform_end < chunk_end {
7951 let split_idx = diff_transform_end - self.range.start;
7952 let (before, after) = chunk.text.split_at(split_idx);
7953 self.range.start = diff_transform_end;
7954 let mask = 1u128.unbounded_shl(split_idx as u32).wrapping_sub(1);
7955 let chars = chunk.chars & mask;
7956 let tabs = chunk.tabs & mask;
7957 let newlines = chunk.newlines & mask;
7958
7959 chunk.text = after;
7960 chunk.chars = chunk.chars >> split_idx;
7961 chunk.tabs = chunk.tabs >> split_idx;
7962 chunk.newlines = chunk.newlines >> split_idx;
7963
7964 Some(Chunk {
7965 text: before,
7966 chars,
7967 tabs,
7968 newlines,
7969 ..chunk.clone()
7970 })
7971 } else {
7972 self.range.start = chunk_end;
7973 self.buffer_chunk.take()
7974 }
7975 }
7976 DiffTransform::DeletedHunk {
7977 buffer_id,
7978 base_text_byte_range,
7979 has_trailing_newline,
7980 ..
7981 } => {
7982 let base_text_start =
7983 base_text_byte_range.start + (self.range.start - diff_transform_start);
7984 let base_text_end =
7985 base_text_byte_range.start + (self.range.end - diff_transform_start);
7986 let base_text_end = base_text_end.min(base_text_byte_range.end);
7987
7988 let mut chunks = if let Some((_, mut chunks)) = self
7989 .diff_base_chunks
7990 .take()
7991 .filter(|(id, _)| id == buffer_id)
7992 {
7993 if chunks.range().start != base_text_start || chunks.range().end < base_text_end
7994 {
7995 chunks.seek(base_text_start..base_text_end);
7996 }
7997 chunks
7998 } else {
7999 let base_buffer =
8000 &find_diff_state(&self.snapshot.diffs, *buffer_id)?.base_text();
8001 base_buffer.chunks(base_text_start..base_text_end, self.language_aware)
8002 };
8003
8004 let chunk = if let Some(chunk) = chunks.next() {
8005 self.range.start += chunk.text.len();
8006 self.diff_base_chunks = Some((*buffer_id, chunks));
8007 chunk
8008 } else {
8009 debug_assert!(has_trailing_newline);
8010 self.range.start += "\n".len();
8011 Chunk {
8012 text: "\n",
8013 chars: 1u128,
8014 newlines: 1u128,
8015 ..Default::default()
8016 }
8017 };
8018 Some(chunk)
8019 }
8020 }
8021 }
8022}
8023
8024impl MultiBufferBytes<'_> {
8025 fn consume(&mut self, len: usize) {
8026 self.range.start += len;
8027 self.chunk = &self.chunk[len..];
8028
8029 if !self.range.is_empty() && self.chunk.is_empty() {
8030 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
8031 self.chunk = chunk;
8032 } else if self.has_trailing_newline {
8033 self.has_trailing_newline = false;
8034 self.chunk = b"\n";
8035 } else {
8036 self.cursor.next();
8037 if let Some(region) = self.cursor.region() {
8038 let mut excerpt_bytes = region.buffer.bytes_in_range(
8039 region.buffer_range.start
8040 ..(region.buffer_range.start + (self.range.end - region.range.start))
8041 .min(region.buffer_range.end),
8042 );
8043 self.chunk = excerpt_bytes.next().unwrap_or(&[]);
8044 self.excerpt_bytes = Some(excerpt_bytes);
8045 self.has_trailing_newline =
8046 region.has_trailing_newline && self.range.end >= region.range.end;
8047 if self.chunk.is_empty() && self.has_trailing_newline {
8048 self.has_trailing_newline = false;
8049 self.chunk = b"\n";
8050 }
8051 }
8052 }
8053 }
8054 }
8055}
8056
8057impl<'a> Iterator for MultiBufferBytes<'a> {
8058 type Item = &'a [u8];
8059
8060 fn next(&mut self) -> Option<Self::Item> {
8061 let chunk = self.chunk;
8062 if chunk.is_empty() {
8063 None
8064 } else {
8065 self.consume(chunk.len());
8066 Some(chunk)
8067 }
8068 }
8069}
8070
8071impl io::Read for MultiBufferBytes<'_> {
8072 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
8073 let len = cmp::min(buf.len(), self.chunk.len());
8074 buf[..len].copy_from_slice(&self.chunk[..len]);
8075 if len > 0 {
8076 self.consume(len);
8077 }
8078 Ok(len)
8079 }
8080}
8081
8082impl io::Read for ReversedMultiBufferBytes<'_> {
8083 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
8084 let len = cmp::min(buf.len(), self.chunk.len());
8085 buf[..len].copy_from_slice(&self.chunk[..len]);
8086 buf[..len].reverse();
8087 if len > 0 {
8088 self.range.end -= len;
8089 self.chunk = &self.chunk[..self.chunk.len() - len];
8090 if !self.range.is_empty()
8091 && self.chunk.is_empty()
8092 && let Some(chunk) = self.chunks.next()
8093 {
8094 self.chunk = chunk.as_bytes();
8095 }
8096 }
8097 Ok(len)
8098 }
8099}
8100
8101impl<'a> Iterator for ExcerptChunks<'a> {
8102 type Item = Chunk<'a>;
8103
8104 fn next(&mut self) -> Option<Self::Item> {
8105 if let Some(chunk) = self.content_chunks.next() {
8106 return Some(chunk);
8107 }
8108
8109 if self.has_footer {
8110 let text = "\n";
8111 let chars = 0b1;
8112 let newlines = 0b1;
8113 self.has_footer = false;
8114 return Some(Chunk {
8115 text,
8116 chars,
8117 newlines,
8118 ..Default::default()
8119 });
8120 }
8121
8122 None
8123 }
8124}
8125
8126impl ToOffset for Point {
8127 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
8128 snapshot.point_to_offset(*self)
8129 }
8130 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
8131 snapshot.point_to_offset_utf16(*self)
8132 }
8133}
8134
8135impl ToOffset for MultiBufferOffset {
8136 #[track_caller]
8137 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
8138 assert!(
8139 *self <= snapshot.len(),
8140 "offset {} is greater than the snapshot.len() {}",
8141 self.0,
8142 snapshot.len().0,
8143 );
8144 *self
8145 }
8146 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
8147 snapshot.offset_to_offset_utf16(*self)
8148 }
8149}
8150
8151impl ToOffset for MultiBufferOffsetUtf16 {
8152 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
8153 snapshot.offset_utf16_to_offset(*self)
8154 }
8155
8156 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
8157 *self
8158 }
8159}
8160
8161impl ToOffset for PointUtf16 {
8162 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
8163 snapshot.point_utf16_to_offset(*self)
8164 }
8165 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
8166 snapshot.point_utf16_to_offset_utf16(*self)
8167 }
8168}
8169
8170impl ToPoint for MultiBufferOffset {
8171 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
8172 snapshot.offset_to_point(*self)
8173 }
8174 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
8175 snapshot.offset_to_point_utf16(*self)
8176 }
8177}
8178
8179impl ToPoint for Point {
8180 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
8181 *self
8182 }
8183 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
8184 snapshot.point_to_point_utf16(*self)
8185 }
8186}
8187
8188impl ToPoint for PointUtf16 {
8189 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
8190 snapshot.point_utf16_to_point(*self)
8191 }
8192 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
8193 *self
8194 }
8195}
8196
8197#[cfg(debug_assertions)]
8198pub mod debug {
8199 use super::*;
8200
8201 pub trait ToMultiBufferDebugRanges {
8202 fn to_multi_buffer_debug_ranges(
8203 &self,
8204 snapshot: &MultiBufferSnapshot,
8205 ) -> Vec<Range<MultiBufferOffset>>;
8206 }
8207
8208 impl<T: ToOffset> ToMultiBufferDebugRanges for T {
8209 fn to_multi_buffer_debug_ranges(
8210 &self,
8211 snapshot: &MultiBufferSnapshot,
8212 ) -> Vec<Range<MultiBufferOffset>> {
8213 [self.to_offset(snapshot)].to_multi_buffer_debug_ranges(snapshot)
8214 }
8215 }
8216
8217 impl<T: ToOffset> ToMultiBufferDebugRanges for Range<T> {
8218 fn to_multi_buffer_debug_ranges(
8219 &self,
8220 snapshot: &MultiBufferSnapshot,
8221 ) -> Vec<Range<MultiBufferOffset>> {
8222 [self.start.to_offset(snapshot)..self.end.to_offset(snapshot)]
8223 .to_multi_buffer_debug_ranges(snapshot)
8224 }
8225 }
8226
8227 impl<T: ToOffset> ToMultiBufferDebugRanges for Vec<T> {
8228 fn to_multi_buffer_debug_ranges(
8229 &self,
8230 snapshot: &MultiBufferSnapshot,
8231 ) -> Vec<Range<MultiBufferOffset>> {
8232 self.as_slice().to_multi_buffer_debug_ranges(snapshot)
8233 }
8234 }
8235
8236 impl<T: ToOffset> ToMultiBufferDebugRanges for Vec<Range<T>> {
8237 fn to_multi_buffer_debug_ranges(
8238 &self,
8239 snapshot: &MultiBufferSnapshot,
8240 ) -> Vec<Range<MultiBufferOffset>> {
8241 self.as_slice().to_multi_buffer_debug_ranges(snapshot)
8242 }
8243 }
8244
8245 impl<T: ToOffset> ToMultiBufferDebugRanges for [T] {
8246 fn to_multi_buffer_debug_ranges(
8247 &self,
8248 snapshot: &MultiBufferSnapshot,
8249 ) -> Vec<Range<MultiBufferOffset>> {
8250 self.iter()
8251 .map(|item| {
8252 let offset = item.to_offset(snapshot);
8253 offset..offset
8254 })
8255 .collect()
8256 }
8257 }
8258
8259 impl<T: ToOffset> ToMultiBufferDebugRanges for [Range<T>] {
8260 fn to_multi_buffer_debug_ranges(
8261 &self,
8262 snapshot: &MultiBufferSnapshot,
8263 ) -> Vec<Range<MultiBufferOffset>> {
8264 self.iter()
8265 .map(|range| range.start.to_offset(snapshot)..range.end.to_offset(snapshot))
8266 .collect()
8267 }
8268 }
8269}