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 anyhow::{Result, anyhow};
12use buffer_diff::{
13 BufferDiff, BufferDiffEvent, BufferDiffSnapshot, DiffHunkSecondaryStatus, DiffHunkStatus,
14 DiffHunkStatusKind,
15};
16use clock::ReplicaId;
17use collections::{BTreeMap, Bound, HashMap, HashSet};
18use gpui::{App, Context, Entity, EntityId, EventEmitter};
19use itertools::Itertools;
20use language::{
21 AutoindentMode, Buffer, BufferChunks, BufferRow, BufferSnapshot, Capability, CharClassifier,
22 CharKind, CharScopeContext, Chunk, CursorShape, DiagnosticEntryRef, DiskState, File,
23 IndentGuideSettings, IndentSize, Language, LanguageScope, OffsetRangeExt, OffsetUtf16, Outline,
24 OutlineItem, Point, PointUtf16, Selection, TextDimension, TextObject, ToOffset as _,
25 ToPoint as _, TransactionId, TreeSitterOptions, Unclipped,
26 language_settings::{LanguageSettings, language_settings},
27};
28
29#[cfg(any(test, feature = "test-support"))]
30use gpui::AppContext as _;
31
32use rope::DimensionPair;
33use smallvec::SmallVec;
34use smol::future::yield_now;
35use std::{
36 any::type_name,
37 borrow::Cow,
38 cell::{Cell, Ref, RefCell},
39 cmp, fmt,
40 future::Future,
41 io,
42 iter::{self, FromIterator},
43 mem,
44 ops::{self, AddAssign, Range, RangeBounds, Sub, SubAssign},
45 rc::Rc,
46 str,
47 sync::Arc,
48 time::Duration,
49};
50use sum_tree::{Bias, Cursor, Dimension, Dimensions, SumTree, TreeMap};
51use text::{
52 BufferId, Edit, LineIndent, TextSummary,
53 locator::Locator,
54 subscription::{Subscription, Topic},
55};
56use theme::SyntaxTheme;
57use util::post_inc;
58
59pub use self::path_key::PathKey;
60
61#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
62pub struct ExcerptId(u32);
63
64/// One or more [`Buffers`](Buffer) being edited in a single view.
65///
66/// See <https://zed.dev/features#multi-buffers>
67pub struct MultiBuffer {
68 /// A snapshot of the [`Excerpt`]s in the MultiBuffer.
69 /// Use [`MultiBuffer::snapshot`] to get a up-to-date snapshot.
70 snapshot: RefCell<MultiBufferSnapshot>,
71 /// Contains the state of the buffers being edited
72 buffers: HashMap<BufferId, BufferState>,
73 /// Mapping from path keys to their excerpts.
74 excerpts_by_path: BTreeMap<PathKey, Vec<ExcerptId>>,
75 /// Mapping from excerpt IDs to their path key.
76 paths_by_excerpt: HashMap<ExcerptId, PathKey>,
77 /// Mapping from buffer IDs to their diff states
78 diffs: HashMap<BufferId, DiffState>,
79 subscriptions: Topic<MultiBufferOffset>,
80 /// If true, the multi-buffer only contains a single [`Buffer`] and a single [`Excerpt`]
81 singleton: bool,
82 /// The history of the multi-buffer.
83 history: History,
84 /// The explicit title of the multi-buffer.
85 /// If `None`, it will be derived from the underlying path or content.
86 title: Option<String>,
87 /// The writing capability of the multi-buffer.
88 capability: Capability,
89 buffer_changed_since_sync: Rc<Cell<bool>>,
90}
91
92#[derive(Clone, Debug, PartialEq, Eq)]
93pub enum Event {
94 ExcerptsAdded {
95 buffer: Entity<Buffer>,
96 predecessor: ExcerptId,
97 excerpts: Vec<(ExcerptId, ExcerptRange<language::Anchor>)>,
98 },
99 ExcerptsRemoved {
100 ids: Vec<ExcerptId>,
101 removed_buffer_ids: Vec<BufferId>,
102 },
103 ExcerptsExpanded {
104 ids: Vec<ExcerptId>,
105 },
106 ExcerptsEdited {
107 excerpt_ids: Vec<ExcerptId>,
108 buffer_ids: Vec<BufferId>,
109 },
110 DiffHunksToggled,
111 Edited {
112 edited_buffer: Option<Entity<Buffer>>,
113 },
114 TransactionUndone {
115 transaction_id: TransactionId,
116 },
117 Reloaded,
118 LanguageChanged(BufferId),
119 Reparsed(BufferId),
120 Saved,
121 FileHandleChanged,
122 DirtyChanged,
123 DiagnosticsUpdated,
124 BufferDiffChanged,
125}
126
127/// A diff hunk, representing a range of consequent lines in a multibuffer.
128#[derive(Debug, Clone, PartialEq, Eq)]
129pub struct MultiBufferDiffHunk {
130 /// The row range in the multibuffer where this diff hunk appears.
131 pub row_range: Range<MultiBufferRow>,
132 /// The buffer ID that this hunk belongs to.
133 pub buffer_id: BufferId,
134 /// The range of the underlying buffer that this hunk corresponds to.
135 pub buffer_range: Range<text::Anchor>,
136 /// The excerpt that contains the diff hunk.
137 pub excerpt_id: ExcerptId,
138 /// The range within the buffer's diff base that this hunk corresponds to.
139 pub diff_base_byte_range: Range<BufferOffset>,
140 /// Whether or not this hunk also appears in the 'secondary diff'.
141 pub secondary_status: DiffHunkSecondaryStatus,
142}
143
144impl MultiBufferDiffHunk {
145 pub fn status(&self) -> DiffHunkStatus {
146 let kind = if self.buffer_range.start == self.buffer_range.end {
147 DiffHunkStatusKind::Deleted
148 } else if self.diff_base_byte_range.is_empty() {
149 DiffHunkStatusKind::Added
150 } else {
151 DiffHunkStatusKind::Modified
152 };
153 DiffHunkStatus {
154 kind,
155 secondary: self.secondary_status,
156 }
157 }
158
159 pub fn is_created_file(&self) -> bool {
160 self.diff_base_byte_range == (BufferOffset(0)..BufferOffset(0))
161 && self.buffer_range == (text::Anchor::MIN..text::Anchor::MAX)
162 }
163
164 pub fn multi_buffer_range(&self) -> Range<Anchor> {
165 let start = Anchor::in_buffer(self.excerpt_id, self.buffer_id, self.buffer_range.start);
166 let end = Anchor::in_buffer(self.excerpt_id, self.buffer_id, self.buffer_range.end);
167 start..end
168 }
169}
170
171pub type MultiBufferPoint = Point;
172type ExcerptOffset = ExcerptDimension<MultiBufferOffset>;
173type ExcerptPoint = ExcerptDimension<Point>;
174
175#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
176#[serde(transparent)]
177pub struct MultiBufferRow(pub u32);
178
179impl MultiBufferRow {
180 pub const MIN: Self = Self(0);
181 pub const MAX: Self = Self(u32::MAX);
182}
183
184impl ops::Add<usize> for MultiBufferRow {
185 type Output = Self;
186
187 fn add(self, rhs: usize) -> Self::Output {
188 MultiBufferRow(self.0 + rhs as u32)
189 }
190}
191
192pub trait MultiBufferDimension: 'static + Copy + Default + std::fmt::Debug {
193 type TextDimension: TextDimension;
194 fn from_summary(summary: &MBTextSummary) -> Self;
195
196 fn add_text_dim(&mut self, summary: &Self::TextDimension);
197
198 fn add_mb_text_summary(&mut self, summary: &MBTextSummary);
199}
200
201// todo(lw): MultiBufferPoint
202impl MultiBufferDimension for Point {
203 type TextDimension = Point;
204 fn from_summary(summary: &MBTextSummary) -> Self {
205 summary.lines
206 }
207
208 fn add_text_dim(&mut self, other: &Self::TextDimension) {
209 *self += *other;
210 }
211
212 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
213 *self += summary.lines;
214 }
215}
216
217// todo(lw): MultiBufferPointUtf16
218impl MultiBufferDimension for PointUtf16 {
219 type TextDimension = PointUtf16;
220 fn from_summary(summary: &MBTextSummary) -> Self {
221 summary.lines_utf16()
222 }
223
224 fn add_text_dim(&mut self, other: &Self::TextDimension) {
225 *self += *other;
226 }
227
228 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
229 *self += summary.lines_utf16();
230 }
231}
232
233#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
234pub struct MultiBufferOffset(pub usize);
235
236impl fmt::Display for MultiBufferOffset {
237 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
238 write!(f, "{}", self.0)
239 }
240}
241
242impl rand::distr::uniform::SampleUniform for MultiBufferOffset {
243 type Sampler = MultiBufferOffsetUniformSampler;
244}
245
246pub struct MultiBufferOffsetUniformSampler {
247 sampler: rand::distr::uniform::UniformUsize,
248}
249
250impl rand::distr::uniform::UniformSampler for MultiBufferOffsetUniformSampler {
251 type X = MultiBufferOffset;
252
253 fn new<B1, B2>(low_b: B1, high_b: B2) -> Result<Self, rand::distr::uniform::Error>
254 where
255 B1: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
256 B2: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
257 {
258 let low = *low_b.borrow();
259 let high = *high_b.borrow();
260 let sampler = rand::distr::uniform::UniformUsize::new(low.0, high.0);
261 sampler.map(|sampler| MultiBufferOffsetUniformSampler { sampler })
262 }
263
264 #[inline] // if the range is constant, this helps LLVM to do the
265 // calculations at compile-time.
266 fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Result<Self, rand::distr::uniform::Error>
267 where
268 B1: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
269 B2: rand::distr::uniform::SampleBorrow<Self::X> + Sized,
270 {
271 let low = *low_b.borrow();
272 let high = *high_b.borrow();
273 let sampler = rand::distr::uniform::UniformUsize::new_inclusive(low.0, high.0);
274 sampler.map(|sampler| MultiBufferOffsetUniformSampler { sampler })
275 }
276
277 fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> Self::X {
278 MultiBufferOffset(self.sampler.sample(rng))
279 }
280}
281impl MultiBufferDimension for MultiBufferOffset {
282 type TextDimension = usize;
283 fn from_summary(summary: &MBTextSummary) -> Self {
284 summary.len
285 }
286
287 fn add_text_dim(&mut self, other: &Self::TextDimension) {
288 self.0 += *other;
289 }
290
291 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
292 *self += summary.len;
293 }
294}
295impl MultiBufferDimension for MultiBufferOffsetUtf16 {
296 type TextDimension = OffsetUtf16;
297 fn from_summary(summary: &MBTextSummary) -> Self {
298 MultiBufferOffsetUtf16(summary.len_utf16)
299 }
300
301 fn add_text_dim(&mut self, other: &Self::TextDimension) {
302 self.0 += *other;
303 }
304
305 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
306 self.0 += summary.len_utf16;
307 }
308}
309
310#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq, Hash, serde::Deserialize)]
311pub struct BufferOffset(pub usize);
312
313impl TextDimension for BufferOffset {
314 fn from_text_summary(summary: &TextSummary) -> Self {
315 BufferOffset(usize::from_text_summary(summary))
316 }
317 fn from_chunk(chunk: rope::ChunkSlice) -> Self {
318 BufferOffset(usize::from_chunk(chunk))
319 }
320 fn add_assign(&mut self, other: &Self) {
321 TextDimension::add_assign(&mut self.0, &other.0);
322 }
323}
324impl<'a> sum_tree::Dimension<'a, rope::ChunkSummary> for BufferOffset {
325 fn zero(cx: ()) -> Self {
326 BufferOffset(<usize as sum_tree::Dimension<'a, rope::ChunkSummary>>::zero(cx))
327 }
328
329 fn add_summary(&mut self, summary: &'a rope::ChunkSummary, cx: ()) {
330 usize::add_summary(&mut self.0, summary, cx);
331 }
332}
333
334impl Sub for BufferOffset {
335 type Output = usize;
336
337 fn sub(self, other: BufferOffset) -> Self::Output {
338 self.0 - other.0
339 }
340}
341
342impl AddAssign<DimensionPair<usize, Point>> for BufferOffset {
343 fn add_assign(&mut self, other: DimensionPair<usize, Point>) {
344 self.0 += other.key;
345 }
346}
347
348impl language::ToPoint for BufferOffset {
349 fn to_point(&self, snapshot: &text::BufferSnapshot) -> Point {
350 self.0.to_point(snapshot)
351 }
352}
353
354impl language::ToPointUtf16 for BufferOffset {
355 fn to_point_utf16(&self, snapshot: &text::BufferSnapshot) -> PointUtf16 {
356 self.0.to_point_utf16(snapshot)
357 }
358}
359
360impl language::ToOffset for BufferOffset {
361 fn to_offset(&self, snapshot: &text::BufferSnapshot) -> usize {
362 self.0.to_offset(snapshot)
363 }
364}
365
366impl language::ToOffsetUtf16 for BufferOffset {
367 fn to_offset_utf16(&self, snapshot: &text::BufferSnapshot) -> OffsetUtf16 {
368 self.0.to_offset_utf16(snapshot)
369 }
370}
371
372#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
373pub struct MultiBufferOffsetUtf16(pub OffsetUtf16);
374
375impl ops::Add<usize> for MultiBufferOffsetUtf16 {
376 type Output = MultiBufferOffsetUtf16;
377
378 fn add(self, rhs: usize) -> Self::Output {
379 MultiBufferOffsetUtf16(OffsetUtf16(self.0.0 + rhs))
380 }
381}
382
383impl AddAssign<OffsetUtf16> for MultiBufferOffsetUtf16 {
384 fn add_assign(&mut self, rhs: OffsetUtf16) {
385 self.0 += rhs;
386 }
387}
388
389impl AddAssign<usize> for MultiBufferOffsetUtf16 {
390 fn add_assign(&mut self, rhs: usize) {
391 self.0.0 += rhs;
392 }
393}
394
395impl Sub for MultiBufferOffsetUtf16 {
396 type Output = OffsetUtf16;
397
398 fn sub(self, other: MultiBufferOffsetUtf16) -> Self::Output {
399 self.0 - other.0
400 }
401}
402
403#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
404pub struct BufferOffsetUtf16(pub OffsetUtf16);
405
406impl MultiBufferOffset {
407 const ZERO: Self = Self(0);
408 pub fn saturating_sub(self, other: MultiBufferOffset) -> usize {
409 self.0.saturating_sub(other.0)
410 }
411 pub fn saturating_sub_usize(self, other: usize) -> MultiBufferOffset {
412 MultiBufferOffset(self.0.saturating_sub(other))
413 }
414}
415
416impl ops::Sub for MultiBufferOffset {
417 type Output = usize;
418
419 fn sub(self, other: MultiBufferOffset) -> Self::Output {
420 self.0 - other.0
421 }
422}
423
424impl ops::Sub<usize> for MultiBufferOffset {
425 type Output = Self;
426
427 fn sub(self, other: usize) -> Self::Output {
428 MultiBufferOffset(self.0 - other)
429 }
430}
431
432impl ops::SubAssign<usize> for MultiBufferOffset {
433 fn sub_assign(&mut self, other: usize) {
434 self.0 -= other;
435 }
436}
437
438impl ops::Add<usize> for BufferOffset {
439 type Output = Self;
440
441 fn add(self, rhs: usize) -> Self::Output {
442 BufferOffset(self.0 + rhs)
443 }
444}
445
446impl ops::AddAssign<usize> for BufferOffset {
447 fn add_assign(&mut self, other: usize) {
448 self.0 += other;
449 }
450}
451
452impl ops::Add<usize> for MultiBufferOffset {
453 type Output = Self;
454
455 fn add(self, rhs: usize) -> Self::Output {
456 MultiBufferOffset(self.0 + rhs)
457 }
458}
459
460impl ops::AddAssign<usize> for MultiBufferOffset {
461 fn add_assign(&mut self, other: usize) {
462 self.0 += other;
463 }
464}
465
466impl ops::Add<isize> for MultiBufferOffset {
467 type Output = Self;
468
469 fn add(self, rhs: isize) -> Self::Output {
470 MultiBufferOffset((self.0 as isize + rhs) as usize)
471 }
472}
473
474impl ops::Add for MultiBufferOffset {
475 type Output = Self;
476
477 fn add(self, rhs: MultiBufferOffset) -> Self::Output {
478 MultiBufferOffset(self.0 + rhs.0)
479 }
480}
481
482impl ops::AddAssign<MultiBufferOffset> for MultiBufferOffset {
483 fn add_assign(&mut self, other: MultiBufferOffset) {
484 self.0 += other.0;
485 }
486}
487
488pub trait ToOffset: 'static + fmt::Debug {
489 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset;
490 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16;
491}
492
493pub trait ToPoint: 'static + fmt::Debug {
494 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
495 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
496}
497
498struct BufferState {
499 buffer: Entity<Buffer>,
500 last_version: RefCell<clock::Global>,
501 last_non_text_state_update_count: Cell<usize>,
502 excerpts: Vec<Locator>,
503 _subscriptions: [gpui::Subscription; 2],
504}
505
506struct DiffState {
507 diff: Entity<BufferDiff>,
508 _subscription: gpui::Subscription,
509}
510
511impl DiffState {
512 fn new(diff: Entity<BufferDiff>, cx: &mut Context<MultiBuffer>) -> Self {
513 DiffState {
514 _subscription: cx.subscribe(&diff, |this, diff, event, cx| match event {
515 BufferDiffEvent::DiffChanged { changed_range } => {
516 if let Some(changed_range) = changed_range.clone() {
517 this.buffer_diff_changed(diff, changed_range, cx)
518 }
519 cx.emit(Event::BufferDiffChanged);
520 }
521 BufferDiffEvent::LanguageChanged => this.buffer_diff_language_changed(diff, cx),
522 _ => {}
523 }),
524 diff,
525 }
526 }
527}
528
529/// The contents of a [`MultiBuffer`] at a single point in time.
530#[derive(Clone, Default)]
531pub struct MultiBufferSnapshot {
532 excerpts: SumTree<Excerpt>,
533 diffs: TreeMap<BufferId, BufferDiffSnapshot>,
534 diff_transforms: SumTree<DiffTransform>,
535 non_text_state_update_count: usize,
536 edit_count: usize,
537 is_dirty: bool,
538 has_deleted_file: bool,
539 has_conflict: bool,
540 /// immutable fields
541 singleton: bool,
542 excerpt_ids: SumTree<ExcerptIdMapping>,
543 replaced_excerpts: TreeMap<ExcerptId, ExcerptId>,
544 trailing_excerpt_update_count: usize,
545 all_diff_hunks_expanded: bool,
546 show_headers: bool,
547}
548
549#[derive(Debug, Clone)]
550enum DiffTransform {
551 BufferContent {
552 summary: MBTextSummary,
553 inserted_hunk_info: Option<DiffTransformHunkInfo>,
554 },
555 DeletedHunk {
556 summary: TextSummary,
557 buffer_id: BufferId,
558 hunk_info: DiffTransformHunkInfo,
559 base_text_byte_range: Range<usize>,
560 has_trailing_newline: bool,
561 },
562}
563
564#[derive(Clone, Copy, Debug)]
565struct DiffTransformHunkInfo {
566 excerpt_id: ExcerptId,
567 hunk_start_anchor: text::Anchor,
568 hunk_secondary_status: DiffHunkSecondaryStatus,
569}
570
571impl Eq for DiffTransformHunkInfo {}
572
573impl PartialEq for DiffTransformHunkInfo {
574 fn eq(&self, other: &DiffTransformHunkInfo) -> bool {
575 self.excerpt_id == other.excerpt_id && self.hunk_start_anchor == other.hunk_start_anchor
576 }
577}
578
579impl std::hash::Hash for DiffTransformHunkInfo {
580 fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
581 self.excerpt_id.hash(state);
582 self.hunk_start_anchor.hash(state);
583 }
584}
585
586#[derive(Clone)]
587pub struct ExcerptInfo {
588 pub id: ExcerptId,
589 pub buffer: BufferSnapshot,
590 pub buffer_id: BufferId,
591 pub range: ExcerptRange<text::Anchor>,
592 pub end_row: MultiBufferRow,
593}
594
595impl std::fmt::Debug for ExcerptInfo {
596 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
597 f.debug_struct(type_name::<Self>())
598 .field("id", &self.id)
599 .field("buffer_id", &self.buffer_id)
600 .field("path", &self.buffer.file().map(|f| f.path()))
601 .field("range", &self.range)
602 .finish()
603 }
604}
605
606/// A boundary between `Excerpt`s in a [`MultiBuffer`]
607#[derive(Debug)]
608pub struct ExcerptBoundary {
609 pub prev: Option<ExcerptInfo>,
610 pub next: ExcerptInfo,
611 /// The row in the `MultiBuffer` where the boundary is located
612 pub row: MultiBufferRow,
613}
614
615impl ExcerptBoundary {
616 pub fn starts_new_buffer(&self) -> bool {
617 match (self.prev.as_ref(), &self.next) {
618 (None, _) => true,
619 (Some(prev), next) => prev.buffer_id != next.buffer_id,
620 }
621 }
622}
623
624#[derive(Copy, Clone, Debug, PartialEq, Eq)]
625pub struct ExpandInfo {
626 pub direction: ExpandExcerptDirection,
627 pub excerpt_id: ExcerptId,
628}
629
630#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
631pub struct RowInfo {
632 pub buffer_id: Option<BufferId>,
633 pub buffer_row: Option<u32>,
634 pub multibuffer_row: Option<MultiBufferRow>,
635 pub diff_status: Option<buffer_diff::DiffHunkStatus>,
636 pub expand_info: Option<ExpandInfo>,
637 pub wrapped_buffer_row: Option<u32>,
638}
639
640/// A slice into a [`Buffer`] that is being edited in a [`MultiBuffer`].
641#[derive(Clone)]
642struct Excerpt {
643 /// The unique identifier for this excerpt
644 id: ExcerptId,
645 /// The location of the excerpt in the [`MultiBuffer`]
646 locator: Locator,
647 /// The buffer being excerpted
648 buffer_id: BufferId,
649 /// A snapshot of the buffer being excerpted
650 buffer: BufferSnapshot,
651 /// The range of the buffer to be shown in the excerpt
652 range: ExcerptRange<text::Anchor>,
653 /// The last row in the excerpted slice of the buffer
654 max_buffer_row: BufferRow,
655 /// A summary of the text in the excerpt
656 text_summary: TextSummary,
657 has_trailing_newline: bool,
658}
659
660/// A public view into an `Excerpt` in a [`MultiBuffer`].
661///
662/// Contains methods for getting the [`Buffer`] of the excerpt,
663/// as well as mapping offsets to/from buffer and multibuffer coordinates.
664#[derive(Clone)]
665pub struct MultiBufferExcerpt<'a> {
666 excerpt: &'a Excerpt,
667 diff_transforms:
668 sum_tree::Cursor<'a, 'static, DiffTransform, DiffTransforms<MultiBufferOffset>>,
669 /// The offset in the multibuffer considering diff transforms.
670 offset: MultiBufferOffset,
671 /// The offset in the multibuffer without diff transforms.
672 excerpt_offset: ExcerptOffset,
673 buffer_offset: BufferOffset,
674}
675
676#[derive(Clone, Debug)]
677struct ExcerptIdMapping {
678 id: ExcerptId,
679 locator: Locator,
680}
681
682/// A range of text from a single [`Buffer`], to be shown as an `Excerpt`.
683/// These ranges are relative to the buffer itself
684#[derive(Clone, Debug, Eq, PartialEq, Hash)]
685pub struct ExcerptRange<T> {
686 /// The full range of text to be shown in the excerpt.
687 pub context: Range<T>,
688 /// The primary range of text to be highlighted in the excerpt.
689 /// In a multi-buffer search, this would be the text that matched the search
690 pub primary: Range<T>,
691}
692
693impl<T: Clone> ExcerptRange<T> {
694 pub fn new(context: Range<T>) -> Self {
695 Self {
696 context: context.clone(),
697 primary: context,
698 }
699 }
700}
701
702#[derive(Clone, Debug, Default)]
703pub struct ExcerptSummary {
704 excerpt_id: ExcerptId,
705 /// The location of the last [`Excerpt`] being summarized
706 excerpt_locator: Locator,
707 widest_line_number: u32,
708 text: MBTextSummary,
709}
710
711#[derive(Debug, Clone)]
712pub struct DiffTransformSummary {
713 input: MBTextSummary,
714 output: MBTextSummary,
715}
716
717/// Summary of a string of text.
718#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
719pub struct MBTextSummary {
720 /// Length in bytes.
721 pub len: MultiBufferOffset,
722 /// Length in UTF-8.
723 pub chars: usize,
724 /// Length in UTF-16 code units
725 pub len_utf16: OffsetUtf16,
726 /// A point representing the number of lines and the length of the last line.
727 ///
728 /// In other words, it marks the point after the last byte in the text, (if
729 /// EOF was a character, this would be its position).
730 pub lines: Point,
731 /// How many `char`s are in the first line
732 pub first_line_chars: u32,
733 /// How many `char`s are in the last line
734 pub last_line_chars: u32,
735 /// How many UTF-16 code units are in the last line
736 pub last_line_len_utf16: u32,
737 /// The row idx of the longest row
738 pub longest_row: u32,
739 /// How many `char`s are in the longest row
740 pub longest_row_chars: u32,
741}
742
743impl From<TextSummary> for MBTextSummary {
744 fn from(summary: TextSummary) -> Self {
745 MBTextSummary {
746 len: MultiBufferOffset(summary.len),
747 chars: summary.chars,
748 len_utf16: summary.len_utf16,
749 lines: summary.lines,
750 first_line_chars: summary.first_line_chars,
751 last_line_chars: summary.last_line_chars,
752 last_line_len_utf16: summary.last_line_len_utf16,
753 longest_row: summary.longest_row,
754 longest_row_chars: summary.longest_row_chars,
755 }
756 }
757}
758impl From<&str> for MBTextSummary {
759 fn from(text: &str) -> Self {
760 MBTextSummary::from(TextSummary::from(text))
761 }
762}
763
764impl MultiBufferDimension for MBTextSummary {
765 type TextDimension = TextSummary;
766
767 fn from_summary(summary: &MBTextSummary) -> Self {
768 *summary
769 }
770
771 fn add_text_dim(&mut self, summary: &Self::TextDimension) {
772 *self += *summary;
773 }
774
775 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
776 *self += *summary;
777 }
778}
779
780impl AddAssign for MBTextSummary {
781 fn add_assign(&mut self, other: MBTextSummary) {
782 let joined_chars = self.last_line_chars + other.first_line_chars;
783 if joined_chars > self.longest_row_chars {
784 self.longest_row = self.lines.row;
785 self.longest_row_chars = joined_chars;
786 }
787 if other.longest_row_chars > self.longest_row_chars {
788 self.longest_row = self.lines.row + other.longest_row;
789 self.longest_row_chars = other.longest_row_chars;
790 }
791
792 if self.lines.row == 0 {
793 self.first_line_chars += other.first_line_chars;
794 }
795
796 if other.lines.row == 0 {
797 self.last_line_chars += other.first_line_chars;
798 self.last_line_len_utf16 += other.last_line_len_utf16;
799 } else {
800 self.last_line_chars = other.last_line_chars;
801 self.last_line_len_utf16 = other.last_line_len_utf16;
802 }
803
804 self.chars += other.chars;
805 self.len += other.len;
806 self.len_utf16 += other.len_utf16;
807 self.lines += other.lines;
808 }
809}
810
811impl AddAssign<TextSummary> for MBTextSummary {
812 fn add_assign(&mut self, other: TextSummary) {
813 *self += MBTextSummary::from(other);
814 }
815}
816
817impl MBTextSummary {
818 pub fn lines_utf16(&self) -> PointUtf16 {
819 PointUtf16 {
820 row: self.lines.row,
821 column: self.last_line_len_utf16,
822 }
823 }
824}
825
826impl<K, V> MultiBufferDimension for DimensionPair<K, V>
827where
828 K: MultiBufferDimension,
829 V: MultiBufferDimension,
830{
831 type TextDimension = DimensionPair<K::TextDimension, V::TextDimension>;
832
833 fn from_summary(summary: &MBTextSummary) -> Self {
834 Self {
835 key: K::from_summary(summary),
836 value: Some(V::from_summary(summary)),
837 }
838 }
839
840 fn add_text_dim(&mut self, summary: &Self::TextDimension) {
841 self.key.add_text_dim(&summary.key);
842 if let Some(value) = &mut self.value {
843 if let Some(other_value) = summary.value.as_ref() {
844 value.add_text_dim(other_value);
845 }
846 }
847 }
848
849 fn add_mb_text_summary(&mut self, summary: &MBTextSummary) {
850 self.key.add_mb_text_summary(summary);
851 if let Some(value) = &mut self.value {
852 value.add_mb_text_summary(summary);
853 }
854 }
855}
856
857#[derive(Clone)]
858pub struct MultiBufferRows<'a> {
859 point: Point,
860 is_empty: bool,
861 is_singleton: bool,
862 cursor: MultiBufferCursor<'a, Point, Point>,
863}
864
865pub struct MultiBufferChunks<'a> {
866 excerpts: Cursor<'a, 'static, Excerpt, ExcerptOffset>,
867 diff_transforms:
868 Cursor<'a, 'static, DiffTransform, Dimensions<MultiBufferOffset, ExcerptOffset>>,
869 diffs: &'a TreeMap<BufferId, BufferDiffSnapshot>,
870 diff_base_chunks: Option<(BufferId, BufferChunks<'a>)>,
871 buffer_chunk: Option<Chunk<'a>>,
872 range: Range<MultiBufferOffset>,
873 excerpt_offset_range: Range<ExcerptOffset>,
874 excerpt_chunks: Option<ExcerptChunks<'a>>,
875 language_aware: bool,
876}
877
878pub struct ReversedMultiBufferChunks<'a> {
879 cursor: MultiBufferCursor<'a, MultiBufferOffset, BufferOffset>,
880 current_chunks: Option<rope::Chunks<'a>>,
881 start: MultiBufferOffset,
882 offset: MultiBufferOffset,
883}
884
885pub struct MultiBufferBytes<'a> {
886 range: Range<MultiBufferOffset>,
887 cursor: MultiBufferCursor<'a, MultiBufferOffset, BufferOffset>,
888 excerpt_bytes: Option<text::Bytes<'a>>,
889 has_trailing_newline: bool,
890 chunk: &'a [u8],
891}
892
893pub struct ReversedMultiBufferBytes<'a> {
894 range: Range<MultiBufferOffset>,
895 chunks: ReversedMultiBufferChunks<'a>,
896 chunk: &'a [u8],
897}
898
899#[derive(Clone)]
900struct DiffTransforms<MBD> {
901 output_dimension: OutputDimension<MBD>,
902 excerpt_dimension: ExcerptDimension<MBD>,
903}
904
905impl<'a, MBD: MultiBufferDimension> Dimension<'a, DiffTransformSummary> for DiffTransforms<MBD> {
906 fn zero(cx: <DiffTransformSummary as sum_tree::Summary>::Context<'_>) -> Self {
907 Self {
908 output_dimension: OutputDimension::zero(cx),
909 excerpt_dimension: <ExcerptDimension<MBD> as Dimension<'a, DiffTransformSummary>>::zero(
910 cx,
911 ),
912 }
913 }
914
915 fn add_summary(
916 &mut self,
917 summary: &'a DiffTransformSummary,
918 cx: <DiffTransformSummary as sum_tree::Summary>::Context<'_>,
919 ) {
920 self.output_dimension.add_summary(summary, cx);
921 self.excerpt_dimension.add_summary(summary, cx);
922 }
923}
924
925#[derive(Clone)]
926struct MultiBufferCursor<'a, MBD, BD> {
927 excerpts: Cursor<'a, 'static, Excerpt, ExcerptDimension<MBD>>,
928 diff_transforms: Cursor<'a, 'static, DiffTransform, DiffTransforms<MBD>>,
929 diffs: &'a TreeMap<BufferId, BufferDiffSnapshot>,
930 cached_region: Option<MultiBufferRegion<'a, MBD, BD>>,
931}
932
933#[derive(Clone)]
934struct MultiBufferRegion<'a, MBD, BD> {
935 buffer: &'a BufferSnapshot,
936 is_main_buffer: bool,
937 diff_hunk_status: Option<DiffHunkStatus>,
938 excerpt: &'a Excerpt,
939 buffer_range: Range<BD>,
940 range: Range<MBD>,
941 has_trailing_newline: bool,
942}
943
944struct ExcerptChunks<'a> {
945 excerpt_id: ExcerptId,
946 content_chunks: BufferChunks<'a>,
947 has_footer: bool,
948}
949
950#[derive(Debug)]
951struct BufferEdit {
952 range: Range<BufferOffset>,
953 new_text: Arc<str>,
954 is_insertion: bool,
955 original_indent_column: Option<u32>,
956 excerpt_id: ExcerptId,
957}
958
959#[derive(Clone, Copy, Debug, PartialEq)]
960enum DiffChangeKind {
961 BufferEdited,
962 DiffUpdated { base_changed: bool },
963 ExpandOrCollapseHunks { expand: bool },
964}
965
966#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
967pub enum ExpandExcerptDirection {
968 Up,
969 Down,
970 UpAndDown,
971}
972
973impl ExpandExcerptDirection {
974 pub fn should_expand_up(&self) -> bool {
975 match self {
976 ExpandExcerptDirection::Up => true,
977 ExpandExcerptDirection::Down => false,
978 ExpandExcerptDirection::UpAndDown => true,
979 }
980 }
981
982 pub fn should_expand_down(&self) -> bool {
983 match self {
984 ExpandExcerptDirection::Up => false,
985 ExpandExcerptDirection::Down => true,
986 ExpandExcerptDirection::UpAndDown => true,
987 }
988 }
989}
990
991#[derive(Clone, Debug, PartialEq)]
992pub struct IndentGuide {
993 pub buffer_id: BufferId,
994 pub start_row: MultiBufferRow,
995 pub end_row: MultiBufferRow,
996 pub depth: u32,
997 pub tab_size: u32,
998 pub settings: IndentGuideSettings,
999}
1000
1001impl IndentGuide {
1002 pub fn indent_level(&self) -> u32 {
1003 self.depth * self.tab_size
1004 }
1005}
1006
1007impl MultiBuffer {
1008 pub fn new(capability: Capability) -> Self {
1009 Self::new_(
1010 capability,
1011 MultiBufferSnapshot {
1012 show_headers: true,
1013 ..MultiBufferSnapshot::default()
1014 },
1015 )
1016 }
1017
1018 pub fn without_headers(capability: Capability) -> Self {
1019 Self::new_(capability, Default::default())
1020 }
1021
1022 pub fn singleton(buffer: Entity<Buffer>, cx: &mut Context<Self>) -> Self {
1023 let mut this = Self::new_(
1024 buffer.read(cx).capability(),
1025 MultiBufferSnapshot {
1026 singleton: true,
1027 ..MultiBufferSnapshot::default()
1028 },
1029 );
1030 this.singleton = true;
1031 this.push_excerpts(
1032 buffer,
1033 [ExcerptRange::new(text::Anchor::MIN..text::Anchor::MAX)],
1034 cx,
1035 );
1036 this
1037 }
1038
1039 #[inline]
1040 pub fn new_(capability: Capability, snapshot: MultiBufferSnapshot) -> Self {
1041 Self {
1042 snapshot: RefCell::new(snapshot),
1043 buffers: Default::default(),
1044 diffs: HashMap::default(),
1045 subscriptions: Topic::default(),
1046 singleton: false,
1047 capability,
1048 title: None,
1049 excerpts_by_path: Default::default(),
1050 paths_by_excerpt: Default::default(),
1051 buffer_changed_since_sync: Default::default(),
1052 history: History::default(),
1053 }
1054 }
1055
1056 pub fn clone(&self, new_cx: &mut Context<Self>) -> Self {
1057 let mut buffers = HashMap::default();
1058 let buffer_changed_since_sync = Rc::new(Cell::new(false));
1059 for (buffer_id, buffer_state) in self.buffers.iter() {
1060 buffer_state.buffer.update(new_cx, |buffer, _| {
1061 buffer.record_changes(Rc::downgrade(&buffer_changed_since_sync));
1062 });
1063 buffers.insert(
1064 *buffer_id,
1065 BufferState {
1066 buffer: buffer_state.buffer.clone(),
1067 last_version: buffer_state.last_version.clone(),
1068 last_non_text_state_update_count: buffer_state
1069 .last_non_text_state_update_count
1070 .clone(),
1071 excerpts: buffer_state.excerpts.clone(),
1072 _subscriptions: [
1073 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
1074 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
1075 ],
1076 },
1077 );
1078 }
1079 let mut diff_bases = HashMap::default();
1080 for (buffer_id, diff) in self.diffs.iter() {
1081 diff_bases.insert(*buffer_id, DiffState::new(diff.diff.clone(), new_cx));
1082 }
1083 Self {
1084 snapshot: RefCell::new(self.snapshot.borrow().clone()),
1085 buffers: buffers,
1086 excerpts_by_path: Default::default(),
1087 paths_by_excerpt: Default::default(),
1088 diffs: diff_bases,
1089 subscriptions: Default::default(),
1090 singleton: self.singleton,
1091 capability: self.capability,
1092 history: self.history.clone(),
1093 title: self.title.clone(),
1094 buffer_changed_since_sync,
1095 }
1096 }
1097
1098 pub fn set_group_interval(&mut self, group_interval: Duration) {
1099 self.history.set_group_interval(group_interval);
1100 }
1101
1102 pub fn with_title(mut self, title: String) -> Self {
1103 self.title = Some(title);
1104 self
1105 }
1106
1107 pub fn read_only(&self) -> bool {
1108 self.capability == Capability::ReadOnly
1109 }
1110
1111 /// Returns an up-to-date snapshot of the MultiBuffer.
1112 pub fn snapshot(&self, cx: &App) -> MultiBufferSnapshot {
1113 self.sync(cx);
1114 self.snapshot.borrow().clone()
1115 }
1116
1117 pub fn read(&self, cx: &App) -> Ref<'_, MultiBufferSnapshot> {
1118 self.sync(cx);
1119 self.snapshot.borrow()
1120 }
1121
1122 pub fn as_singleton(&self) -> Option<Entity<Buffer>> {
1123 if self.singleton {
1124 Some(self.buffers.values().next().unwrap().buffer.clone())
1125 } else {
1126 None
1127 }
1128 }
1129
1130 pub fn is_singleton(&self) -> bool {
1131 self.singleton
1132 }
1133
1134 pub fn subscribe(&mut self) -> Subscription<MultiBufferOffset> {
1135 self.subscriptions.subscribe()
1136 }
1137
1138 pub fn is_dirty(&self, cx: &App) -> bool {
1139 self.read(cx).is_dirty()
1140 }
1141
1142 pub fn has_deleted_file(&self, cx: &App) -> bool {
1143 self.read(cx).has_deleted_file()
1144 }
1145
1146 pub fn has_conflict(&self, cx: &App) -> bool {
1147 self.read(cx).has_conflict()
1148 }
1149
1150 // The `is_empty` signature doesn't match what clippy expects
1151 #[allow(clippy::len_without_is_empty)]
1152 pub fn len(&self, cx: &App) -> MultiBufferOffset {
1153 self.read(cx).len()
1154 }
1155
1156 pub fn is_empty(&self) -> bool {
1157 self.buffers.is_empty()
1158 }
1159
1160 pub fn edit<I, S, T>(
1161 &mut self,
1162 edits: I,
1163 autoindent_mode: Option<AutoindentMode>,
1164 cx: &mut Context<Self>,
1165 ) where
1166 I: IntoIterator<Item = (Range<S>, T)>,
1167 S: ToOffset,
1168 T: Into<Arc<str>>,
1169 {
1170 if self.read_only() || self.buffers.is_empty() {
1171 return;
1172 }
1173 self.sync_mut(cx);
1174 let edits = edits
1175 .into_iter()
1176 .map(|(range, new_text)| {
1177 let mut range = range.start.to_offset(self.snapshot.get_mut())
1178 ..range.end.to_offset(self.snapshot.get_mut());
1179 if range.start > range.end {
1180 mem::swap(&mut range.start, &mut range.end);
1181 }
1182 (range, new_text.into())
1183 })
1184 .collect::<Vec<_>>();
1185
1186 return edit_internal(self, edits, autoindent_mode, cx);
1187
1188 // Non-generic part of edit, hoisted out to avoid blowing up LLVM IR.
1189 fn edit_internal(
1190 this: &mut MultiBuffer,
1191 edits: Vec<(Range<MultiBufferOffset>, Arc<str>)>,
1192 mut autoindent_mode: Option<AutoindentMode>,
1193 cx: &mut Context<MultiBuffer>,
1194 ) {
1195 let original_indent_columns = match &mut autoindent_mode {
1196 Some(AutoindentMode::Block {
1197 original_indent_columns,
1198 }) => mem::take(original_indent_columns),
1199 _ => Default::default(),
1200 };
1201
1202 let (buffer_edits, edited_excerpt_ids) = MultiBuffer::convert_edits_to_buffer_edits(
1203 edits,
1204 this.snapshot.get_mut(),
1205 &original_indent_columns,
1206 );
1207
1208 let mut buffer_ids = Vec::with_capacity(buffer_edits.len());
1209 for (buffer_id, mut edits) in buffer_edits {
1210 buffer_ids.push(buffer_id);
1211 edits.sort_by_key(|edit| edit.range.start);
1212 this.buffers[&buffer_id].buffer.update(cx, |buffer, cx| {
1213 let mut edits = edits.into_iter().peekable();
1214 let mut insertions = Vec::new();
1215 let mut original_indent_columns = Vec::new();
1216 let mut deletions = Vec::new();
1217 let empty_str: Arc<str> = Arc::default();
1218 while let Some(BufferEdit {
1219 mut range,
1220 mut new_text,
1221 mut is_insertion,
1222 original_indent_column,
1223 excerpt_id,
1224 }) = edits.next()
1225 {
1226 while let Some(BufferEdit {
1227 range: next_range,
1228 is_insertion: next_is_insertion,
1229 new_text: next_new_text,
1230 excerpt_id: next_excerpt_id,
1231 ..
1232 }) = edits.peek()
1233 {
1234 if range.end >= next_range.start {
1235 range.end = cmp::max(next_range.end, range.end);
1236 is_insertion |= *next_is_insertion;
1237 if excerpt_id == *next_excerpt_id {
1238 new_text = format!("{new_text}{next_new_text}").into();
1239 }
1240 edits.next();
1241 } else {
1242 break;
1243 }
1244 }
1245
1246 if is_insertion {
1247 original_indent_columns.push(original_indent_column);
1248 insertions.push((
1249 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
1250 new_text.clone(),
1251 ));
1252 } else if !range.is_empty() {
1253 deletions.push((
1254 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
1255 empty_str.clone(),
1256 ));
1257 }
1258 }
1259
1260 let deletion_autoindent_mode =
1261 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
1262 Some(AutoindentMode::Block {
1263 original_indent_columns: Default::default(),
1264 })
1265 } else {
1266 autoindent_mode.clone()
1267 };
1268 let insertion_autoindent_mode =
1269 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
1270 Some(AutoindentMode::Block {
1271 original_indent_columns,
1272 })
1273 } else {
1274 autoindent_mode.clone()
1275 };
1276
1277 buffer.edit(deletions, deletion_autoindent_mode, cx);
1278 buffer.edit(insertions, insertion_autoindent_mode, cx);
1279 })
1280 }
1281
1282 cx.emit(Event::ExcerptsEdited {
1283 excerpt_ids: edited_excerpt_ids,
1284 buffer_ids,
1285 });
1286 }
1287 }
1288
1289 fn convert_edits_to_buffer_edits(
1290 edits: Vec<(Range<MultiBufferOffset>, Arc<str>)>,
1291 snapshot: &MultiBufferSnapshot,
1292 original_indent_columns: &[Option<u32>],
1293 ) -> (HashMap<BufferId, Vec<BufferEdit>>, Vec<ExcerptId>) {
1294 let mut buffer_edits: HashMap<BufferId, Vec<BufferEdit>> = Default::default();
1295 let mut edited_excerpt_ids = Vec::new();
1296 let mut cursor = snapshot.cursor::<MultiBufferOffset, BufferOffset>();
1297 for (ix, (range, new_text)) in edits.into_iter().enumerate() {
1298 let original_indent_column = original_indent_columns.get(ix).copied().flatten();
1299
1300 cursor.seek(&range.start);
1301 let mut start_region = cursor.region().expect("start offset out of bounds");
1302 if !start_region.is_main_buffer {
1303 cursor.next();
1304 if let Some(region) = cursor.region() {
1305 start_region = region;
1306 } else {
1307 continue;
1308 }
1309 }
1310
1311 if range.end < start_region.range.start {
1312 continue;
1313 }
1314
1315 if range.end > start_region.range.end {
1316 cursor.seek_forward(&range.end);
1317 }
1318 let mut end_region = cursor.region().expect("end offset out of bounds");
1319 if !end_region.is_main_buffer {
1320 cursor.prev();
1321 if let Some(region) = cursor.region() {
1322 end_region = region;
1323 } else {
1324 continue;
1325 }
1326 }
1327
1328 if range.start > end_region.range.end {
1329 continue;
1330 }
1331
1332 let start_overshoot = range.start.saturating_sub(start_region.range.start);
1333 let end_overshoot = range.end.saturating_sub(end_region.range.start);
1334 let buffer_start = (start_region.buffer_range.start + start_overshoot)
1335 .min(start_region.buffer_range.end);
1336 let buffer_end =
1337 (end_region.buffer_range.start + end_overshoot).min(end_region.buffer_range.end);
1338
1339 if start_region.excerpt.id == end_region.excerpt.id {
1340 if start_region.is_main_buffer {
1341 edited_excerpt_ids.push(start_region.excerpt.id);
1342 buffer_edits
1343 .entry(start_region.buffer.remote_id())
1344 .or_default()
1345 .push(BufferEdit {
1346 range: buffer_start..buffer_end,
1347 new_text,
1348 is_insertion: true,
1349 original_indent_column,
1350 excerpt_id: start_region.excerpt.id,
1351 });
1352 }
1353 } else {
1354 let start_excerpt_range = buffer_start..start_region.buffer_range.end;
1355 let end_excerpt_range = end_region.buffer_range.start..buffer_end;
1356 if start_region.is_main_buffer {
1357 edited_excerpt_ids.push(start_region.excerpt.id);
1358 buffer_edits
1359 .entry(start_region.buffer.remote_id())
1360 .or_default()
1361 .push(BufferEdit {
1362 range: start_excerpt_range,
1363 new_text: new_text.clone(),
1364 is_insertion: true,
1365 original_indent_column,
1366 excerpt_id: start_region.excerpt.id,
1367 });
1368 }
1369 if end_region.is_main_buffer {
1370 edited_excerpt_ids.push(end_region.excerpt.id);
1371 buffer_edits
1372 .entry(end_region.buffer.remote_id())
1373 .or_default()
1374 .push(BufferEdit {
1375 range: end_excerpt_range,
1376 new_text: new_text.clone(),
1377 is_insertion: false,
1378 original_indent_column,
1379 excerpt_id: end_region.excerpt.id,
1380 });
1381 }
1382
1383 cursor.seek(&range.start);
1384 cursor.next_excerpt();
1385 while let Some(region) = cursor.region() {
1386 if region.excerpt.id == end_region.excerpt.id {
1387 break;
1388 }
1389 if region.is_main_buffer {
1390 edited_excerpt_ids.push(region.excerpt.id);
1391 buffer_edits
1392 .entry(region.buffer.remote_id())
1393 .or_default()
1394 .push(BufferEdit {
1395 range: region.buffer_range,
1396 new_text: new_text.clone(),
1397 is_insertion: false,
1398 original_indent_column,
1399 excerpt_id: region.excerpt.id,
1400 });
1401 }
1402 cursor.next_excerpt();
1403 }
1404 }
1405 }
1406 (buffer_edits, edited_excerpt_ids)
1407 }
1408
1409 pub fn autoindent_ranges<I, S>(&mut self, ranges: I, cx: &mut Context<Self>)
1410 where
1411 I: IntoIterator<Item = Range<S>>,
1412 S: ToOffset,
1413 {
1414 if self.read_only() || self.buffers.is_empty() {
1415 return;
1416 }
1417 self.sync_mut(cx);
1418 let empty = Arc::<str>::from("");
1419 let edits = ranges
1420 .into_iter()
1421 .map(|range| {
1422 let mut range = range.start.to_offset(self.snapshot.get_mut())
1423 ..range.end.to_offset(&self.snapshot.get_mut());
1424 if range.start > range.end {
1425 mem::swap(&mut range.start, &mut range.end);
1426 }
1427 (range, empty.clone())
1428 })
1429 .collect::<Vec<_>>();
1430
1431 return autoindent_ranges_internal(self, edits, cx);
1432
1433 fn autoindent_ranges_internal(
1434 this: &mut MultiBuffer,
1435 edits: Vec<(Range<MultiBufferOffset>, Arc<str>)>,
1436 cx: &mut Context<MultiBuffer>,
1437 ) {
1438 let (buffer_edits, edited_excerpt_ids) =
1439 MultiBuffer::convert_edits_to_buffer_edits(edits, this.snapshot.get_mut(), &[]);
1440
1441 let mut buffer_ids = Vec::new();
1442 for (buffer_id, mut edits) in buffer_edits {
1443 buffer_ids.push(buffer_id);
1444 edits.sort_unstable_by_key(|edit| edit.range.start);
1445
1446 let mut ranges: Vec<Range<BufferOffset>> = Vec::new();
1447 for edit in edits {
1448 if let Some(last_range) = ranges.last_mut()
1449 && edit.range.start <= last_range.end
1450 {
1451 last_range.end = last_range.end.max(edit.range.end);
1452 continue;
1453 }
1454 ranges.push(edit.range);
1455 }
1456
1457 this.buffers[&buffer_id].buffer.update(cx, |buffer, cx| {
1458 buffer.autoindent_ranges(ranges, cx);
1459 })
1460 }
1461
1462 cx.emit(Event::ExcerptsEdited {
1463 excerpt_ids: edited_excerpt_ids,
1464 buffer_ids,
1465 });
1466 }
1467 }
1468
1469 /// Inserts newlines at the given position to create an empty line, returning the start of the new line.
1470 /// You can also request the insertion of empty lines above and below the line starting at the returned point.
1471 /// Panics if the given position is invalid.
1472 pub fn insert_empty_line(
1473 &mut self,
1474 position: impl ToPoint,
1475 space_above: bool,
1476 space_below: bool,
1477 cx: &mut Context<Self>,
1478 ) -> Point {
1479 let multibuffer_point = position.to_point(&self.read(cx));
1480 let (buffer, buffer_point, _) = self.point_to_buffer_point(multibuffer_point, cx).unwrap();
1481 self.start_transaction(cx);
1482 let empty_line_start = buffer.update(cx, |buffer, cx| {
1483 buffer.insert_empty_line(buffer_point, space_above, space_below, cx)
1484 });
1485 self.end_transaction(cx);
1486 multibuffer_point + (empty_line_start - buffer_point)
1487 }
1488
1489 pub fn set_active_selections(
1490 &self,
1491 selections: &[Selection<Anchor>],
1492 line_mode: bool,
1493 cursor_shape: CursorShape,
1494 cx: &mut Context<Self>,
1495 ) {
1496 let mut selections_by_buffer: HashMap<BufferId, Vec<Selection<text::Anchor>>> =
1497 Default::default();
1498 let snapshot = self.read(cx);
1499 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(());
1500 for selection in selections {
1501 let start_locator = snapshot.excerpt_locator_for_id(selection.start.excerpt_id);
1502 let end_locator = snapshot.excerpt_locator_for_id(selection.end.excerpt_id);
1503
1504 cursor.seek(&Some(start_locator), Bias::Left);
1505 while let Some(excerpt) = cursor.item()
1506 && excerpt.locator <= *end_locator
1507 {
1508 let mut start = excerpt.range.context.start;
1509 let mut end = excerpt.range.context.end;
1510 if excerpt.id == selection.start.excerpt_id {
1511 start = selection.start.text_anchor;
1512 }
1513 if excerpt.id == selection.end.excerpt_id {
1514 end = selection.end.text_anchor;
1515 }
1516 selections_by_buffer
1517 .entry(excerpt.buffer_id)
1518 .or_default()
1519 .push(Selection {
1520 id: selection.id,
1521 start,
1522 end,
1523 reversed: selection.reversed,
1524 goal: selection.goal,
1525 });
1526
1527 cursor.next();
1528 }
1529 }
1530
1531 for (buffer_id, buffer_state) in self.buffers.iter() {
1532 if !selections_by_buffer.contains_key(buffer_id) {
1533 buffer_state
1534 .buffer
1535 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1536 }
1537 }
1538
1539 for (buffer_id, mut selections) in selections_by_buffer {
1540 self.buffers[&buffer_id].buffer.update(cx, |buffer, cx| {
1541 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer));
1542 let mut selections = selections.into_iter().peekable();
1543 let merged_selections = Arc::from_iter(iter::from_fn(|| {
1544 let mut selection = selections.next()?;
1545 while let Some(next_selection) = selections.peek() {
1546 if selection.end.cmp(&next_selection.start, buffer).is_ge() {
1547 let next_selection = selections.next().unwrap();
1548 if next_selection.end.cmp(&selection.end, buffer).is_ge() {
1549 selection.end = next_selection.end;
1550 }
1551 } else {
1552 break;
1553 }
1554 }
1555 Some(selection)
1556 }));
1557 buffer.set_active_selections(merged_selections, line_mode, cursor_shape, cx);
1558 });
1559 }
1560 }
1561
1562 pub fn remove_active_selections(&self, cx: &mut Context<Self>) {
1563 for buffer in self.buffers.values() {
1564 buffer
1565 .buffer
1566 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
1567 }
1568 }
1569
1570 pub fn push_excerpts<O>(
1571 &mut self,
1572 buffer: Entity<Buffer>,
1573 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1574 cx: &mut Context<Self>,
1575 ) -> Vec<ExcerptId>
1576 where
1577 O: text::ToOffset,
1578 {
1579 self.insert_excerpts_after(ExcerptId::max(), buffer, ranges, cx)
1580 }
1581
1582 fn merge_excerpt_ranges<'a>(
1583 expanded_ranges: impl IntoIterator<Item = &'a ExcerptRange<Point>> + 'a,
1584 ) -> (Vec<ExcerptRange<Point>>, Vec<usize>) {
1585 let mut merged_ranges: Vec<ExcerptRange<Point>> = Vec::new();
1586 let mut counts: Vec<usize> = Vec::new();
1587 for range in expanded_ranges {
1588 if let Some(last_range) = merged_ranges.last_mut() {
1589 assert!(
1590 last_range.context.start <= range.context.start,
1591 "ranges must be sorted: {last_range:?} <= {range:?}"
1592 );
1593 if last_range.context.end >= range.context.start
1594 || last_range.context.end.row + 1 == range.context.start.row
1595 {
1596 last_range.context.end = range.context.end.max(last_range.context.end);
1597 *counts.last_mut().unwrap() += 1;
1598 continue;
1599 }
1600 }
1601 merged_ranges.push(range.clone());
1602 counts.push(1);
1603 }
1604 (merged_ranges, counts)
1605 }
1606
1607 pub fn insert_excerpts_after<O>(
1608 &mut self,
1609 prev_excerpt_id: ExcerptId,
1610 buffer: Entity<Buffer>,
1611 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
1612 cx: &mut Context<Self>,
1613 ) -> Vec<ExcerptId>
1614 where
1615 O: text::ToOffset,
1616 {
1617 let mut ids = Vec::new();
1618 let mut next_excerpt_id =
1619 if let Some(last_entry) = self.snapshot.borrow().excerpt_ids.last() {
1620 last_entry.id.0 + 1
1621 } else {
1622 1
1623 };
1624 self.insert_excerpts_with_ids_after(
1625 prev_excerpt_id,
1626 buffer,
1627 ranges.into_iter().map(|range| {
1628 let id = ExcerptId(post_inc(&mut next_excerpt_id));
1629 ids.push(id);
1630 (id, range)
1631 }),
1632 cx,
1633 );
1634 ids
1635 }
1636
1637 pub fn insert_excerpts_with_ids_after<O>(
1638 &mut self,
1639 prev_excerpt_id: ExcerptId,
1640 buffer: Entity<Buffer>,
1641 ranges: impl IntoIterator<Item = (ExcerptId, ExcerptRange<O>)>,
1642 cx: &mut Context<Self>,
1643 ) where
1644 O: text::ToOffset,
1645 {
1646 assert_eq!(self.history.transaction_depth(), 0);
1647 let mut ranges = ranges.into_iter().peekable();
1648 if ranges.peek().is_none() {
1649 return Default::default();
1650 }
1651
1652 self.sync_mut(cx);
1653
1654 let buffer_snapshot = buffer.read(cx).snapshot();
1655 let buffer_id = buffer_snapshot.remote_id();
1656
1657 let buffer_state = self.buffers.entry(buffer_id).or_insert_with(|| {
1658 self.buffer_changed_since_sync.replace(true);
1659 buffer.update(cx, |buffer, _| {
1660 buffer.record_changes(Rc::downgrade(&self.buffer_changed_since_sync));
1661 });
1662 BufferState {
1663 last_version: RefCell::new(buffer_snapshot.version().clone()),
1664 last_non_text_state_update_count: Cell::new(
1665 buffer_snapshot.non_text_state_update_count(),
1666 ),
1667 excerpts: Default::default(),
1668 _subscriptions: [
1669 cx.observe(&buffer, |_, _, cx| cx.notify()),
1670 cx.subscribe(&buffer, Self::on_buffer_event),
1671 ],
1672 buffer: buffer.clone(),
1673 }
1674 });
1675
1676 let mut snapshot = self.snapshot.get_mut();
1677
1678 let mut prev_locator = snapshot.excerpt_locator_for_id(prev_excerpt_id).clone();
1679 let mut new_excerpt_ids = mem::take(&mut snapshot.excerpt_ids);
1680 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(());
1681 let mut new_excerpts = cursor.slice(&prev_locator, Bias::Right);
1682 prev_locator = cursor.start().unwrap_or(Locator::min_ref()).clone();
1683
1684 let edit_start = ExcerptDimension(new_excerpts.summary().text.len);
1685 new_excerpts.update_last(
1686 |excerpt| {
1687 excerpt.has_trailing_newline = true;
1688 },
1689 (),
1690 );
1691
1692 let next_locator = if let Some(excerpt) = cursor.item() {
1693 excerpt.locator.clone()
1694 } else {
1695 Locator::max()
1696 };
1697
1698 let mut excerpts = Vec::new();
1699 while let Some((id, range)) = ranges.next() {
1700 let locator = Locator::between(&prev_locator, &next_locator);
1701 if let Err(ix) = buffer_state.excerpts.binary_search(&locator) {
1702 buffer_state.excerpts.insert(ix, locator.clone());
1703 }
1704 let range = ExcerptRange {
1705 context: buffer_snapshot.anchor_before(&range.context.start)
1706 ..buffer_snapshot.anchor_after(&range.context.end),
1707 primary: buffer_snapshot.anchor_before(&range.primary.start)
1708 ..buffer_snapshot.anchor_after(&range.primary.end),
1709 };
1710 excerpts.push((id, range.clone()));
1711 let excerpt = Excerpt::new(
1712 id,
1713 locator.clone(),
1714 buffer_id,
1715 buffer_snapshot.clone(),
1716 range,
1717 ranges.peek().is_some() || cursor.item().is_some(),
1718 );
1719 new_excerpts.push(excerpt, ());
1720 prev_locator = locator.clone();
1721
1722 if let Some(last_mapping_entry) = new_excerpt_ids.last() {
1723 assert!(id > last_mapping_entry.id, "excerpt ids must be increasing");
1724 }
1725 new_excerpt_ids.push(ExcerptIdMapping { id, locator }, ());
1726 }
1727
1728 let edit_end = ExcerptDimension(new_excerpts.summary().text.len);
1729
1730 let suffix = cursor.suffix();
1731 let changed_trailing_excerpt = suffix.is_empty();
1732 new_excerpts.append(suffix, ());
1733 drop(cursor);
1734 snapshot.excerpts = new_excerpts;
1735 snapshot.excerpt_ids = new_excerpt_ids;
1736 if changed_trailing_excerpt {
1737 snapshot.trailing_excerpt_update_count += 1;
1738 }
1739
1740 let edits = Self::sync_diff_transforms(
1741 &mut snapshot,
1742 vec![Edit {
1743 old: edit_start..edit_start,
1744 new: edit_start..edit_end,
1745 }],
1746 DiffChangeKind::BufferEdited,
1747 );
1748 if !edits.is_empty() {
1749 self.subscriptions.publish(edits);
1750 }
1751
1752 cx.emit(Event::Edited {
1753 edited_buffer: None,
1754 });
1755 cx.emit(Event::ExcerptsAdded {
1756 buffer,
1757 predecessor: prev_excerpt_id,
1758 excerpts,
1759 });
1760 cx.notify();
1761 }
1762
1763 pub fn clear(&mut self, cx: &mut Context<Self>) {
1764 self.sync_mut(cx);
1765 let ids = self.excerpt_ids();
1766 let removed_buffer_ids = self.buffers.drain().map(|(id, _)| id).collect();
1767 self.excerpts_by_path.clear();
1768 self.paths_by_excerpt.clear();
1769 let MultiBufferSnapshot {
1770 excerpts,
1771 diffs: _,
1772 diff_transforms: _,
1773 non_text_state_update_count: _,
1774 edit_count: _,
1775 is_dirty,
1776 has_deleted_file,
1777 has_conflict,
1778 singleton: _,
1779 excerpt_ids: _,
1780 replaced_excerpts,
1781 trailing_excerpt_update_count,
1782 all_diff_hunks_expanded: _,
1783 show_headers: _,
1784 } = self.snapshot.get_mut();
1785 let start = ExcerptDimension(MultiBufferOffset::ZERO);
1786 let prev_len = ExcerptDimension(excerpts.summary().text.len);
1787 *excerpts = Default::default();
1788 *trailing_excerpt_update_count += 1;
1789 *is_dirty = false;
1790 *has_deleted_file = false;
1791 *has_conflict = false;
1792 replaced_excerpts.clear();
1793
1794 let edits = Self::sync_diff_transforms(
1795 self.snapshot.get_mut(),
1796 vec![Edit {
1797 old: start..prev_len,
1798 new: start..start,
1799 }],
1800 DiffChangeKind::BufferEdited,
1801 );
1802 if !edits.is_empty() {
1803 self.subscriptions.publish(edits);
1804 }
1805 cx.emit(Event::Edited {
1806 edited_buffer: None,
1807 });
1808 cx.emit(Event::ExcerptsRemoved {
1809 ids,
1810 removed_buffer_ids,
1811 });
1812 cx.notify();
1813 }
1814
1815 pub fn excerpts_for_buffer(
1816 &self,
1817 buffer_id: BufferId,
1818 cx: &App,
1819 ) -> Vec<(ExcerptId, ExcerptRange<text::Anchor>)> {
1820 let mut excerpts = Vec::new();
1821 let snapshot = self.read(cx);
1822 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>(());
1823 if let Some(locators) = self.buffers.get(&buffer_id).map(|state| &state.excerpts) {
1824 for locator in locators {
1825 cursor.seek_forward(&Some(locator), Bias::Left);
1826 if let Some(excerpt) = cursor.item()
1827 && excerpt.locator == *locator
1828 {
1829 excerpts.push((excerpt.id, excerpt.range.clone()));
1830 }
1831 }
1832 }
1833
1834 excerpts
1835 }
1836
1837 pub fn excerpt_ranges_for_buffer(&self, buffer_id: BufferId, cx: &App) -> Vec<Range<Point>> {
1838 let snapshot = self.read(cx);
1839 let mut excerpts = snapshot
1840 .excerpts
1841 .cursor::<Dimensions<Option<&Locator>, ExcerptPoint>>(());
1842 let mut diff_transforms = snapshot
1843 .diff_transforms
1844 .cursor::<Dimensions<ExcerptPoint, OutputDimension<Point>>>(());
1845 diff_transforms.next();
1846 let locators = self
1847 .buffers
1848 .get(&buffer_id)
1849 .into_iter()
1850 .flat_map(|state| &state.excerpts);
1851 let mut result = Vec::new();
1852 for locator in locators {
1853 excerpts.seek_forward(&Some(locator), Bias::Left);
1854 if let Some(excerpt) = excerpts.item()
1855 && excerpt.locator == *locator
1856 {
1857 let excerpt_start = excerpts.start().1;
1858 let excerpt_end = excerpt_start + excerpt.text_summary.lines;
1859
1860 diff_transforms.seek_forward(&excerpt_start, Bias::Left);
1861 let overshoot = excerpt_start - diff_transforms.start().0;
1862 let start = diff_transforms.start().1 + overshoot;
1863
1864 diff_transforms.seek_forward(&excerpt_end, Bias::Right);
1865 let overshoot = excerpt_end - diff_transforms.start().0;
1866 let end = diff_transforms.start().1 + overshoot;
1867
1868 result.push(start.0..end.0)
1869 }
1870 }
1871 result
1872 }
1873
1874 pub fn excerpt_buffer_ids(&self) -> Vec<BufferId> {
1875 self.snapshot
1876 .borrow()
1877 .excerpts
1878 .iter()
1879 .map(|entry| entry.buffer_id)
1880 .collect()
1881 }
1882
1883 pub fn excerpt_ids(&self) -> Vec<ExcerptId> {
1884 self.snapshot
1885 .borrow()
1886 .excerpts
1887 .iter()
1888 .map(|entry| entry.id)
1889 .collect()
1890 }
1891
1892 pub fn excerpt_containing(
1893 &self,
1894 position: impl ToOffset,
1895 cx: &App,
1896 ) -> Option<(ExcerptId, Entity<Buffer>, Range<text::Anchor>)> {
1897 let snapshot = self.read(cx);
1898 let offset = position.to_offset(&snapshot);
1899
1900 let mut cursor = snapshot.cursor::<MultiBufferOffset, BufferOffset>();
1901 cursor.seek(&offset);
1902 cursor
1903 .excerpt()
1904 .or_else(|| snapshot.excerpts.last())
1905 .map(|excerpt| {
1906 (
1907 excerpt.id,
1908 self.buffers.get(&excerpt.buffer_id).unwrap().buffer.clone(),
1909 excerpt.range.context.clone(),
1910 )
1911 })
1912 }
1913
1914 pub fn buffer_for_anchor(&self, anchor: Anchor, cx: &App) -> Option<Entity<Buffer>> {
1915 if let Some(buffer_id) = anchor.buffer_id {
1916 self.buffer(buffer_id)
1917 } else {
1918 let (_, buffer, _) = self.excerpt_containing(anchor, cx)?;
1919 Some(buffer)
1920 }
1921 }
1922
1923 // If point is at the end of the buffer, the last excerpt is returned
1924 pub fn point_to_buffer_offset<T: ToOffset>(
1925 &self,
1926 point: T,
1927 cx: &App,
1928 ) -> Option<(Entity<Buffer>, BufferOffset)> {
1929 let snapshot = self.read(cx);
1930 let (buffer, offset) = snapshot.point_to_buffer_offset(point)?;
1931 Some((
1932 self.buffers.get(&buffer.remote_id())?.buffer.clone(),
1933 offset,
1934 ))
1935 }
1936
1937 // If point is at the end of the buffer, the last excerpt is returned
1938 pub fn point_to_buffer_point<T: ToPoint>(
1939 &self,
1940 point: T,
1941 cx: &App,
1942 ) -> Option<(Entity<Buffer>, Point, ExcerptId)> {
1943 let snapshot = self.read(cx);
1944 let (buffer, point, is_main_buffer) =
1945 snapshot.point_to_buffer_point(point.to_point(&snapshot))?;
1946 Some((
1947 self.buffers.get(&buffer.remote_id())?.buffer.clone(),
1948 point,
1949 is_main_buffer,
1950 ))
1951 }
1952
1953 pub fn buffer_point_to_anchor(
1954 &self,
1955 buffer: &Entity<Buffer>,
1956 point: Point,
1957 cx: &App,
1958 ) -> Option<Anchor> {
1959 let mut found = None;
1960 let snapshot = buffer.read(cx).snapshot();
1961 for (excerpt_id, range) in self.excerpts_for_buffer(snapshot.remote_id(), cx) {
1962 let start = range.context.start.to_point(&snapshot);
1963 let end = range.context.end.to_point(&snapshot);
1964 if start <= point && point < end {
1965 found = Some((snapshot.clip_point(point, Bias::Left), excerpt_id));
1966 break;
1967 }
1968 if point < start {
1969 found = Some((start, excerpt_id));
1970 }
1971 if point > end {
1972 found = Some((end, excerpt_id));
1973 }
1974 }
1975
1976 found.map(|(point, excerpt_id)| {
1977 let text_anchor = snapshot.anchor_after(point);
1978 Anchor::in_buffer(excerpt_id, snapshot.remote_id(), text_anchor)
1979 })
1980 }
1981
1982 pub fn buffer_anchor_to_anchor(
1983 &self,
1984 buffer: &Entity<Buffer>,
1985 anchor: text::Anchor,
1986 cx: &App,
1987 ) -> Option<Anchor> {
1988 let snapshot = buffer.read(cx).snapshot();
1989 for (excerpt_id, range) in self.excerpts_for_buffer(snapshot.remote_id(), cx) {
1990 if range.context.start.cmp(&anchor, &snapshot).is_le()
1991 && range.context.end.cmp(&anchor, &snapshot).is_ge()
1992 {
1993 return Some(Anchor::in_buffer(excerpt_id, snapshot.remote_id(), anchor));
1994 }
1995 }
1996
1997 None
1998 }
1999
2000 pub fn remove_excerpts(
2001 &mut self,
2002 excerpt_ids: impl IntoIterator<Item = ExcerptId>,
2003 cx: &mut Context<Self>,
2004 ) {
2005 self.sync_mut(cx);
2006 let ids = excerpt_ids.into_iter().collect::<Vec<_>>();
2007 if ids.is_empty() {
2008 return;
2009 }
2010 self.buffer_changed_since_sync.replace(true);
2011
2012 let mut snapshot = self.snapshot.get_mut();
2013 let mut new_excerpts = SumTree::default();
2014 let mut cursor = snapshot
2015 .excerpts
2016 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
2017 let mut edits = Vec::new();
2018 let mut excerpt_ids = ids.iter().copied().peekable();
2019 let mut removed_buffer_ids = Vec::new();
2020
2021 while let Some(excerpt_id) = excerpt_ids.next() {
2022 self.paths_by_excerpt.remove(&excerpt_id);
2023 // Seek to the next excerpt to remove, preserving any preceding excerpts.
2024 let locator = snapshot.excerpt_locator_for_id(excerpt_id);
2025 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left), ());
2026
2027 if let Some(mut excerpt) = cursor.item() {
2028 if excerpt.id != excerpt_id {
2029 continue;
2030 }
2031 let mut old_start = cursor.start().1;
2032
2033 // Skip over the removed excerpt.
2034 'remove_excerpts: loop {
2035 if let Some(buffer_state) = self.buffers.get_mut(&excerpt.buffer_id) {
2036 buffer_state.excerpts.retain(|l| l != &excerpt.locator);
2037 if buffer_state.excerpts.is_empty() {
2038 log::debug!(
2039 "removing buffer and diff for buffer {}",
2040 excerpt.buffer_id
2041 );
2042 self.buffers.remove(&excerpt.buffer_id);
2043 removed_buffer_ids.push(excerpt.buffer_id);
2044 }
2045 }
2046 cursor.next();
2047
2048 // Skip over any subsequent excerpts that are also removed.
2049 if let Some(&next_excerpt_id) = excerpt_ids.peek() {
2050 let next_locator = snapshot.excerpt_locator_for_id(next_excerpt_id);
2051 if let Some(next_excerpt) = cursor.item()
2052 && next_excerpt.locator == *next_locator
2053 {
2054 excerpt_ids.next();
2055 excerpt = next_excerpt;
2056 continue 'remove_excerpts;
2057 }
2058 }
2059
2060 break;
2061 }
2062
2063 // When removing the last excerpt, remove the trailing newline from
2064 // the previous excerpt.
2065 if cursor.item().is_none() && old_start > MultiBufferOffset::ZERO {
2066 old_start -= 1;
2067 new_excerpts.update_last(|e| e.has_trailing_newline = false, ());
2068 }
2069
2070 // Push an edit for the removal of this run of excerpts.
2071 let old_end = cursor.start().1;
2072 let new_start = ExcerptDimension(new_excerpts.summary().text.len);
2073 edits.push(Edit {
2074 old: old_start..old_end,
2075 new: new_start..new_start,
2076 });
2077 }
2078 }
2079 let suffix = cursor.suffix();
2080 let changed_trailing_excerpt = suffix.is_empty();
2081 new_excerpts.append(suffix, ());
2082 drop(cursor);
2083 snapshot.excerpts = new_excerpts;
2084 for buffer_id in &removed_buffer_ids {
2085 self.diffs.remove(buffer_id);
2086 snapshot.diffs.remove(buffer_id);
2087 }
2088
2089 if changed_trailing_excerpt {
2090 snapshot.trailing_excerpt_update_count += 1;
2091 }
2092
2093 let edits = Self::sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2094 if !edits.is_empty() {
2095 self.subscriptions.publish(edits);
2096 }
2097 cx.emit(Event::Edited {
2098 edited_buffer: None,
2099 });
2100 cx.emit(Event::ExcerptsRemoved {
2101 ids,
2102 removed_buffer_ids,
2103 });
2104 cx.notify();
2105 }
2106
2107 pub fn wait_for_anchors<'a, Anchors: 'a + Iterator<Item = Anchor>>(
2108 &self,
2109 anchors: Anchors,
2110 cx: &mut Context<Self>,
2111 ) -> impl 'static + Future<Output = Result<()>> + use<Anchors> {
2112 let mut error = None;
2113 let mut futures = Vec::new();
2114 for anchor in anchors {
2115 if let Some(buffer_id) = anchor.buffer_id {
2116 if let Some(buffer) = self.buffers.get(&buffer_id) {
2117 buffer.buffer.update(cx, |buffer, _| {
2118 futures.push(buffer.wait_for_anchors([anchor.text_anchor]))
2119 });
2120 } else {
2121 error = Some(anyhow!(
2122 "buffer {buffer_id} is not part of this multi-buffer"
2123 ));
2124 break;
2125 }
2126 }
2127 }
2128 async move {
2129 if let Some(error) = error {
2130 Err(error)?;
2131 }
2132 for future in futures {
2133 future.await?;
2134 }
2135 Ok(())
2136 }
2137 }
2138
2139 pub fn text_anchor_for_position<T: ToOffset>(
2140 &self,
2141 position: T,
2142 cx: &App,
2143 ) -> Option<(Entity<Buffer>, language::Anchor)> {
2144 let snapshot = self.read(cx);
2145 let anchor = snapshot.anchor_before(position);
2146 let buffer = self.buffers.get(&anchor.buffer_id?)?.buffer.clone();
2147 Some((buffer, anchor.text_anchor))
2148 }
2149
2150 fn on_buffer_event(
2151 &mut self,
2152 buffer: Entity<Buffer>,
2153 event: &language::BufferEvent,
2154 cx: &mut Context<Self>,
2155 ) {
2156 use language::BufferEvent;
2157 cx.emit(match event {
2158 BufferEvent::Edited => Event::Edited {
2159 edited_buffer: Some(buffer),
2160 },
2161 BufferEvent::DirtyChanged => Event::DirtyChanged,
2162 BufferEvent::Saved => Event::Saved,
2163 BufferEvent::FileHandleChanged => Event::FileHandleChanged,
2164 BufferEvent::Reloaded => Event::Reloaded,
2165 BufferEvent::LanguageChanged => Event::LanguageChanged(buffer.read(cx).remote_id()),
2166 BufferEvent::Reparsed => Event::Reparsed(buffer.read(cx).remote_id()),
2167 BufferEvent::DiagnosticsUpdated => Event::DiagnosticsUpdated,
2168 BufferEvent::CapabilityChanged => {
2169 self.capability = buffer.read(cx).capability();
2170 return;
2171 }
2172 BufferEvent::Operation { .. } | BufferEvent::ReloadNeeded => return,
2173 });
2174 }
2175
2176 fn buffer_diff_language_changed(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2177 let diff = diff.read(cx);
2178 let buffer_id = diff.buffer_id;
2179 let diff = diff.snapshot(cx);
2180 self.snapshot.get_mut().diffs.insert(buffer_id, diff);
2181 }
2182
2183 fn buffer_diff_changed(
2184 &mut self,
2185 diff: Entity<BufferDiff>,
2186 range: Range<text::Anchor>,
2187 cx: &mut Context<Self>,
2188 ) {
2189 self.sync_mut(cx);
2190
2191 let diff = diff.read(cx);
2192 let buffer_id = diff.buffer_id;
2193 let Some(buffer_state) = self.buffers.get(&buffer_id) else {
2194 return;
2195 };
2196 self.buffer_changed_since_sync.replace(true);
2197
2198 let buffer = buffer_state.buffer.read(cx);
2199 let diff_change_range = range.to_offset(buffer);
2200
2201 let new_diff = diff.snapshot(cx);
2202 let mut snapshot = self.snapshot.get_mut();
2203 let base_text_changed = snapshot
2204 .diffs
2205 .get(&buffer_id)
2206 .is_none_or(|old_diff| !new_diff.base_texts_eq(old_diff));
2207
2208 snapshot.diffs.insert(buffer_id, new_diff);
2209
2210 let mut excerpt_edits = Vec::new();
2211 for locator in &buffer_state.excerpts {
2212 let mut cursor = snapshot
2213 .excerpts
2214 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
2215 cursor.seek_forward(&Some(locator), Bias::Left);
2216 if let Some(excerpt) = cursor.item()
2217 && excerpt.locator == *locator
2218 {
2219 let excerpt_buffer_range = excerpt.range.context.to_offset(&excerpt.buffer);
2220 if diff_change_range.end < excerpt_buffer_range.start
2221 || diff_change_range.start > excerpt_buffer_range.end
2222 {
2223 continue;
2224 }
2225 let excerpt_start = cursor.start().1;
2226 let excerpt_len = excerpt.text_summary.len;
2227 let diff_change_start_in_excerpt = diff_change_range
2228 .start
2229 .saturating_sub(excerpt_buffer_range.start);
2230 let diff_change_end_in_excerpt = diff_change_range
2231 .end
2232 .saturating_sub(excerpt_buffer_range.start);
2233 let edit_start = excerpt_start + diff_change_start_in_excerpt.min(excerpt_len);
2234 let edit_end = excerpt_start + diff_change_end_in_excerpt.min(excerpt_len);
2235 excerpt_edits.push(Edit {
2236 old: edit_start..edit_end,
2237 new: edit_start..edit_end,
2238 });
2239 }
2240 }
2241
2242 let edits = Self::sync_diff_transforms(
2243 &mut snapshot,
2244 excerpt_edits,
2245 DiffChangeKind::DiffUpdated {
2246 base_changed: base_text_changed,
2247 },
2248 );
2249 if !edits.is_empty() {
2250 self.subscriptions.publish(edits);
2251 }
2252 cx.emit(Event::Edited {
2253 edited_buffer: None,
2254 });
2255 }
2256
2257 pub fn all_buffers(&self) -> HashSet<Entity<Buffer>> {
2258 self.buffers
2259 .values()
2260 .map(|state| state.buffer.clone())
2261 .collect()
2262 }
2263
2264 pub fn all_buffer_ids(&self) -> Vec<BufferId> {
2265 self.buffers.keys().copied().collect()
2266 }
2267
2268 pub fn buffer(&self, buffer_id: BufferId) -> Option<Entity<Buffer>> {
2269 self.buffers
2270 .get(&buffer_id)
2271 .map(|state| state.buffer.clone())
2272 }
2273
2274 pub fn language_at<T: ToOffset>(&self, point: T, cx: &App) -> Option<Arc<Language>> {
2275 self.point_to_buffer_offset(point, cx)
2276 .and_then(|(buffer, offset)| buffer.read(cx).language_at(offset))
2277 }
2278
2279 pub fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
2280 let buffer_id = self
2281 .snapshot
2282 .borrow()
2283 .excerpts
2284 .first()
2285 .map(|excerpt| excerpt.buffer.remote_id());
2286 buffer_id
2287 .and_then(|buffer_id| self.buffer(buffer_id))
2288 .map(|buffer| {
2289 let buffer = buffer.read(cx);
2290 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx)
2291 })
2292 .unwrap_or_else(move || self.language_settings_at(MultiBufferOffset::default(), cx))
2293 }
2294
2295 pub fn language_settings_at<'a, T: ToOffset>(
2296 &'a self,
2297 point: T,
2298 cx: &'a App,
2299 ) -> Cow<'a, LanguageSettings> {
2300 let mut language = None;
2301 let mut file = None;
2302 if let Some((buffer, offset)) = self.point_to_buffer_offset(point, cx) {
2303 let buffer = buffer.read(cx);
2304 language = buffer.language_at(offset);
2305 file = buffer.file();
2306 }
2307 language_settings(language.map(|l| l.name()), file, cx)
2308 }
2309
2310 pub fn for_each_buffer(&self, mut f: impl FnMut(&Entity<Buffer>)) {
2311 self.buffers.values().for_each(|state| f(&state.buffer))
2312 }
2313
2314 pub fn explicit_title(&self) -> Option<&str> {
2315 self.title.as_deref()
2316 }
2317
2318 pub fn title<'a>(&'a self, cx: &'a App) -> Cow<'a, str> {
2319 if let Some(title) = self.title.as_ref() {
2320 return title.into();
2321 }
2322
2323 if let Some(buffer) = self.as_singleton() {
2324 let buffer = buffer.read(cx);
2325
2326 if let Some(file) = buffer.file() {
2327 return file.file_name(cx).into();
2328 }
2329
2330 if let Some(title) = self.buffer_content_title(buffer) {
2331 return title;
2332 }
2333 };
2334
2335 "untitled".into()
2336 }
2337
2338 fn buffer_content_title(&self, buffer: &Buffer) -> Option<Cow<'_, str>> {
2339 let mut is_leading_whitespace = true;
2340 let mut count = 0;
2341 let mut prev_was_space = false;
2342 let mut title = String::new();
2343
2344 for ch in buffer.snapshot().chars() {
2345 if is_leading_whitespace && ch.is_whitespace() {
2346 continue;
2347 }
2348
2349 is_leading_whitespace = false;
2350
2351 if ch == '\n' || count >= 40 {
2352 break;
2353 }
2354
2355 if ch.is_whitespace() {
2356 if !prev_was_space {
2357 title.push(' ');
2358 count += 1;
2359 prev_was_space = true;
2360 }
2361 } else {
2362 title.push(ch);
2363 count += 1;
2364 prev_was_space = false;
2365 }
2366 }
2367
2368 let title = title.trim_end().to_string();
2369
2370 if title.is_empty() {
2371 return None;
2372 }
2373
2374 Some(title.into())
2375 }
2376
2377 pub fn set_title(&mut self, title: String, cx: &mut Context<Self>) {
2378 self.title = Some(title);
2379 cx.notify();
2380 }
2381
2382 /// Preserve preview tabs containing this multibuffer until additional edits occur.
2383 pub fn refresh_preview(&self, cx: &mut Context<Self>) {
2384 for buffer_state in self.buffers.values() {
2385 buffer_state
2386 .buffer
2387 .update(cx, |buffer, _cx| buffer.refresh_preview());
2388 }
2389 }
2390
2391 /// Whether we should preserve the preview status of a tab containing this multi-buffer.
2392 pub fn preserve_preview(&self, cx: &App) -> bool {
2393 self.buffers
2394 .values()
2395 .all(|state| state.buffer.read(cx).preserve_preview())
2396 }
2397
2398 #[cfg(any(test, feature = "test-support"))]
2399 pub fn is_parsing(&self, cx: &App) -> bool {
2400 self.as_singleton().unwrap().read(cx).is_parsing()
2401 }
2402
2403 pub fn add_diff(&mut self, diff: Entity<BufferDiff>, cx: &mut Context<Self>) {
2404 let buffer_id = diff.read(cx).buffer_id;
2405 self.buffer_diff_changed(diff.clone(), text::Anchor::MIN..text::Anchor::MAX, cx);
2406 self.diffs.insert(buffer_id, DiffState::new(diff, cx));
2407 }
2408
2409 pub fn diff_for(&self, buffer_id: BufferId) -> Option<Entity<BufferDiff>> {
2410 self.diffs.get(&buffer_id).map(|state| state.diff.clone())
2411 }
2412
2413 pub fn expand_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2414 self.expand_or_collapse_diff_hunks(ranges, true, cx);
2415 }
2416
2417 pub fn collapse_diff_hunks(&mut self, ranges: Vec<Range<Anchor>>, cx: &mut Context<Self>) {
2418 self.expand_or_collapse_diff_hunks(ranges, false, cx);
2419 }
2420
2421 pub fn set_all_diff_hunks_expanded(&mut self, cx: &mut Context<Self>) {
2422 self.snapshot.get_mut().all_diff_hunks_expanded = true;
2423 self.expand_or_collapse_diff_hunks(vec![Anchor::min()..Anchor::max()], true, cx);
2424 }
2425
2426 pub fn all_diff_hunks_expanded(&self) -> bool {
2427 self.snapshot.borrow().all_diff_hunks_expanded
2428 }
2429
2430 pub fn set_all_diff_hunks_collapsed(&mut self, cx: &mut Context<Self>) {
2431 self.snapshot.get_mut().all_diff_hunks_expanded = false;
2432 self.expand_or_collapse_diff_hunks(vec![Anchor::min()..Anchor::max()], false, cx);
2433 }
2434
2435 pub fn has_multiple_hunks(&self, cx: &App) -> bool {
2436 self.read(cx)
2437 .diff_hunks_in_range(Anchor::min()..Anchor::max())
2438 .nth(1)
2439 .is_some()
2440 }
2441
2442 pub fn single_hunk_is_expanded(&self, range: Range<Anchor>, cx: &App) -> bool {
2443 let snapshot = self.read(cx);
2444 let mut cursor = snapshot.diff_transforms.cursor::<MultiBufferOffset>(());
2445 let offset_range = range.to_offset(&snapshot);
2446 cursor.seek(&offset_range.start, Bias::Left);
2447 while let Some(item) = cursor.item() {
2448 if *cursor.start() >= offset_range.end && *cursor.start() > offset_range.start {
2449 break;
2450 }
2451 if item.hunk_info().is_some() {
2452 return true;
2453 }
2454 cursor.next();
2455 }
2456 false
2457 }
2458
2459 pub fn has_expanded_diff_hunks_in_ranges(&self, ranges: &[Range<Anchor>], cx: &App) -> bool {
2460 let snapshot = self.read(cx);
2461 let mut cursor = snapshot.diff_transforms.cursor::<MultiBufferOffset>(());
2462 for range in ranges {
2463 let range = range.to_point(&snapshot);
2464 let start = snapshot.point_to_offset(Point::new(range.start.row, 0));
2465 let end = snapshot.point_to_offset(Point::new(range.end.row + 1, 0));
2466 let start = start.saturating_sub_usize(1);
2467 let end = snapshot.len().min(end + 1usize);
2468 cursor.seek(&start, Bias::Right);
2469 while let Some(item) = cursor.item() {
2470 if *cursor.start() >= end {
2471 break;
2472 }
2473 if item.hunk_info().is_some() {
2474 return true;
2475 }
2476 cursor.next();
2477 }
2478 }
2479 false
2480 }
2481
2482 pub fn expand_or_collapse_diff_hunks_inner(
2483 &mut self,
2484 ranges: impl IntoIterator<Item = (Range<Point>, ExcerptId)>,
2485 expand: bool,
2486 cx: &mut Context<Self>,
2487 ) {
2488 if self.snapshot.borrow().all_diff_hunks_expanded && !expand {
2489 return;
2490 }
2491 self.sync_mut(cx);
2492 let mut snapshot = self.snapshot.get_mut();
2493 let mut excerpt_edits = Vec::new();
2494 let mut last_hunk_row = None;
2495 for (range, end_excerpt_id) in ranges {
2496 for diff_hunk in snapshot.diff_hunks_in_range(range) {
2497 if diff_hunk.excerpt_id.cmp(&end_excerpt_id, &snapshot).is_gt() {
2498 continue;
2499 }
2500 if last_hunk_row.is_some_and(|row| row >= diff_hunk.row_range.start) {
2501 continue;
2502 }
2503 let start = Anchor::in_buffer(
2504 diff_hunk.excerpt_id,
2505 diff_hunk.buffer_id,
2506 diff_hunk.buffer_range.start,
2507 );
2508 let end = Anchor::in_buffer(
2509 diff_hunk.excerpt_id,
2510 diff_hunk.buffer_id,
2511 diff_hunk.buffer_range.end,
2512 );
2513 let start = snapshot.excerpt_offset_for_anchor(&start);
2514 let end = snapshot.excerpt_offset_for_anchor(&end);
2515 last_hunk_row = Some(diff_hunk.row_range.start);
2516 excerpt_edits.push(text::Edit {
2517 old: start..end,
2518 new: start..end,
2519 });
2520 }
2521 }
2522
2523 let edits = Self::sync_diff_transforms(
2524 &mut snapshot,
2525 excerpt_edits,
2526 DiffChangeKind::ExpandOrCollapseHunks { expand },
2527 );
2528 if !edits.is_empty() {
2529 self.subscriptions.publish(edits);
2530 }
2531 cx.emit(Event::DiffHunksToggled);
2532 cx.emit(Event::Edited {
2533 edited_buffer: None,
2534 });
2535 }
2536
2537 pub fn expand_or_collapse_diff_hunks(
2538 &mut self,
2539 ranges: Vec<Range<Anchor>>,
2540 expand: bool,
2541 cx: &mut Context<Self>,
2542 ) {
2543 let snapshot = self.snapshot.borrow().clone();
2544 let ranges = ranges.iter().map(move |range| {
2545 let end_excerpt_id = range.end.excerpt_id;
2546 let range = range.to_point(&snapshot);
2547 let mut peek_end = range.end;
2548 if range.end.row < snapshot.max_row().0 {
2549 peek_end = Point::new(range.end.row + 1, 0);
2550 };
2551 (range.start..peek_end, end_excerpt_id)
2552 });
2553 self.expand_or_collapse_diff_hunks_inner(ranges, expand, cx);
2554 }
2555
2556 pub fn resize_excerpt(
2557 &mut self,
2558 id: ExcerptId,
2559 range: Range<text::Anchor>,
2560 cx: &mut Context<Self>,
2561 ) {
2562 self.sync_mut(cx);
2563
2564 let mut snapshot = self.snapshot.get_mut();
2565 let locator = snapshot.excerpt_locator_for_id(id);
2566 let mut new_excerpts = SumTree::default();
2567 let mut cursor = snapshot
2568 .excerpts
2569 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
2570 let mut edits = Vec::<Edit<ExcerptOffset>>::new();
2571
2572 let prefix = cursor.slice(&Some(locator), Bias::Left);
2573 new_excerpts.append(prefix, ());
2574
2575 let mut excerpt = cursor.item().unwrap().clone();
2576 let old_text_len = excerpt.text_summary.len;
2577
2578 excerpt.range.context.start = range.start;
2579 excerpt.range.context.end = range.end;
2580 excerpt.max_buffer_row = range.end.to_point(&excerpt.buffer).row;
2581
2582 excerpt.text_summary = excerpt
2583 .buffer
2584 .text_summary_for_range(excerpt.range.context.clone());
2585
2586 let new_start_offset = ExcerptDimension(new_excerpts.summary().text.len);
2587 let old_start_offset = cursor.start().1;
2588 let new_text_len = excerpt.text_summary.len;
2589 let edit = Edit {
2590 old: old_start_offset..old_start_offset + old_text_len,
2591 new: new_start_offset..new_start_offset + new_text_len,
2592 };
2593
2594 if let Some(last_edit) = edits.last_mut() {
2595 if last_edit.old.end == edit.old.start {
2596 last_edit.old.end = edit.old.end;
2597 last_edit.new.end = edit.new.end;
2598 } else {
2599 edits.push(edit);
2600 }
2601 } else {
2602 edits.push(edit);
2603 }
2604
2605 new_excerpts.push(excerpt, ());
2606
2607 cursor.next();
2608
2609 new_excerpts.append(cursor.suffix(), ());
2610
2611 drop(cursor);
2612 snapshot.excerpts = new_excerpts;
2613
2614 let edits = Self::sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2615 if !edits.is_empty() {
2616 self.subscriptions.publish(edits);
2617 }
2618 cx.emit(Event::Edited {
2619 edited_buffer: None,
2620 });
2621 cx.emit(Event::ExcerptsExpanded { ids: vec![id] });
2622 cx.notify();
2623 }
2624
2625 pub fn expand_excerpts(
2626 &mut self,
2627 ids: impl IntoIterator<Item = ExcerptId>,
2628 line_count: u32,
2629 direction: ExpandExcerptDirection,
2630 cx: &mut Context<Self>,
2631 ) {
2632 if line_count == 0 {
2633 return;
2634 }
2635 self.sync_mut(cx);
2636 if !self.excerpts_by_path.is_empty() {
2637 self.expand_excerpts_with_paths(ids, line_count, direction, cx);
2638 return;
2639 }
2640 let mut snapshot = self.snapshot.get_mut();
2641
2642 let ids = ids.into_iter().collect::<Vec<_>>();
2643 let locators = snapshot.excerpt_locators_for_ids(ids.iter().copied());
2644 let mut new_excerpts = SumTree::default();
2645 let mut cursor = snapshot
2646 .excerpts
2647 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
2648 let mut edits = Vec::<Edit<ExcerptOffset>>::new();
2649
2650 for locator in &locators {
2651 let prefix = cursor.slice(&Some(locator), Bias::Left);
2652 new_excerpts.append(prefix, ());
2653
2654 let mut excerpt = cursor.item().unwrap().clone();
2655 let old_text_len = excerpt.text_summary.len;
2656
2657 let up_line_count = if direction.should_expand_up() {
2658 line_count
2659 } else {
2660 0
2661 };
2662
2663 let start_row = excerpt
2664 .range
2665 .context
2666 .start
2667 .to_point(&excerpt.buffer)
2668 .row
2669 .saturating_sub(up_line_count);
2670 let start_point = Point::new(start_row, 0);
2671 excerpt.range.context.start = excerpt.buffer.anchor_before(start_point);
2672
2673 let down_line_count = if direction.should_expand_down() {
2674 line_count
2675 } else {
2676 0
2677 };
2678
2679 let mut end_point = excerpt.buffer.clip_point(
2680 excerpt.range.context.end.to_point(&excerpt.buffer)
2681 + Point::new(down_line_count, 0),
2682 Bias::Left,
2683 );
2684 end_point.column = excerpt.buffer.line_len(end_point.row);
2685 excerpt.range.context.end = excerpt.buffer.anchor_after(end_point);
2686 excerpt.max_buffer_row = end_point.row;
2687
2688 excerpt.text_summary = excerpt
2689 .buffer
2690 .text_summary_for_range(excerpt.range.context.clone());
2691
2692 let new_start_offset = ExcerptDimension(new_excerpts.summary().text.len);
2693 let old_start_offset = cursor.start().1;
2694 let new_text_len = excerpt.text_summary.len;
2695 let edit = Edit {
2696 old: old_start_offset..old_start_offset + old_text_len,
2697 new: new_start_offset..new_start_offset + new_text_len,
2698 };
2699
2700 if let Some(last_edit) = edits.last_mut() {
2701 if last_edit.old.end == edit.old.start {
2702 last_edit.old.end = edit.old.end;
2703 last_edit.new.end = edit.new.end;
2704 } else {
2705 edits.push(edit);
2706 }
2707 } else {
2708 edits.push(edit);
2709 }
2710
2711 new_excerpts.push(excerpt, ());
2712
2713 cursor.next();
2714 }
2715
2716 new_excerpts.append(cursor.suffix(), ());
2717
2718 drop(cursor);
2719 snapshot.excerpts = new_excerpts;
2720
2721 let edits = Self::sync_diff_transforms(&mut snapshot, edits, DiffChangeKind::BufferEdited);
2722 if !edits.is_empty() {
2723 self.subscriptions.publish(edits);
2724 }
2725 cx.emit(Event::Edited {
2726 edited_buffer: None,
2727 });
2728 cx.emit(Event::ExcerptsExpanded { ids });
2729 cx.notify();
2730 }
2731
2732 fn sync(&self, cx: &App) {
2733 let changed = self.buffer_changed_since_sync.replace(false);
2734 if !changed {
2735 return;
2736 }
2737 let edits = Self::sync_(
2738 &mut self.snapshot.borrow_mut(),
2739 &self.buffers,
2740 &self.diffs,
2741 cx,
2742 );
2743 if !edits.is_empty() {
2744 self.subscriptions.publish(edits);
2745 }
2746 }
2747
2748 fn sync_mut(&mut self, cx: &App) {
2749 let changed = self.buffer_changed_since_sync.replace(false);
2750 if !changed {
2751 return;
2752 }
2753 let edits = Self::sync_(self.snapshot.get_mut(), &self.buffers, &self.diffs, cx);
2754
2755 if !edits.is_empty() {
2756 self.subscriptions.publish(edits);
2757 }
2758 }
2759
2760 fn sync_(
2761 snapshot: &mut MultiBufferSnapshot,
2762 buffers: &HashMap<BufferId, BufferState>,
2763 diffs: &HashMap<BufferId, DiffState>,
2764 cx: &App,
2765 ) -> Vec<Edit<MultiBufferOffset>> {
2766 let MultiBufferSnapshot {
2767 excerpts,
2768 diffs: buffer_diff,
2769 diff_transforms: _,
2770 non_text_state_update_count,
2771 edit_count,
2772 is_dirty,
2773 has_deleted_file,
2774 has_conflict,
2775 singleton: _,
2776 excerpt_ids: _,
2777 replaced_excerpts: _,
2778 trailing_excerpt_update_count: _,
2779 all_diff_hunks_expanded: _,
2780 show_headers: _,
2781 } = snapshot;
2782 *is_dirty = false;
2783 *has_deleted_file = false;
2784 *has_conflict = false;
2785
2786 let mut excerpts_to_edit = Vec::new();
2787 let mut non_text_state_updated = false;
2788 let mut edited = false;
2789 for buffer_state in buffers.values() {
2790 let buffer = buffer_state.buffer.read(cx);
2791 let version = buffer.version();
2792 let non_text_state_update_count = buffer.non_text_state_update_count();
2793
2794 let buffer_edited = version.changed_since(&buffer_state.last_version.borrow());
2795 let buffer_non_text_state_updated =
2796 non_text_state_update_count > buffer_state.last_non_text_state_update_count.get();
2797 if buffer_edited || buffer_non_text_state_updated {
2798 *buffer_state.last_version.borrow_mut() = version;
2799 buffer_state
2800 .last_non_text_state_update_count
2801 .set(non_text_state_update_count);
2802 excerpts_to_edit.extend(
2803 buffer_state
2804 .excerpts
2805 .iter()
2806 .map(|locator| (locator, buffer_state.buffer.clone(), buffer_edited)),
2807 );
2808 }
2809
2810 edited |= buffer_edited;
2811 non_text_state_updated |= buffer_non_text_state_updated;
2812 *is_dirty |= buffer.is_dirty();
2813 *has_deleted_file |= buffer
2814 .file()
2815 .is_some_and(|file| file.disk_state() == DiskState::Deleted);
2816 *has_conflict |= buffer.has_conflict();
2817 }
2818 if edited {
2819 *edit_count += 1;
2820 }
2821 if non_text_state_updated {
2822 *non_text_state_update_count += 1;
2823 }
2824
2825 for (id, diff) in diffs.iter() {
2826 if buffer_diff.get(id).is_none() {
2827 buffer_diff.insert(*id, diff.diff.read(cx).snapshot(cx));
2828 }
2829 }
2830
2831 excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);
2832
2833 let mut edits = Vec::new();
2834 let mut new_excerpts = SumTree::default();
2835 let mut cursor = excerpts.cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
2836
2837 for (locator, buffer, buffer_edited) in excerpts_to_edit {
2838 new_excerpts.append(cursor.slice(&Some(locator), Bias::Left), ());
2839 let old_excerpt = cursor.item().unwrap();
2840 let buffer = buffer.read(cx);
2841 let buffer_id = buffer.remote_id();
2842
2843 let mut new_excerpt;
2844 if buffer_edited {
2845 edits.extend(
2846 buffer
2847 .edits_since_in_range::<usize>(
2848 old_excerpt.buffer.version(),
2849 old_excerpt.range.context.clone(),
2850 )
2851 .map(|edit| {
2852 let excerpt_old_start = cursor.start().1;
2853 let excerpt_new_start =
2854 ExcerptDimension(new_excerpts.summary().text.len);
2855 let old_start = excerpt_old_start + edit.old.start;
2856 let old_end = excerpt_old_start + edit.old.end;
2857 let new_start = excerpt_new_start + edit.new.start;
2858 let new_end = excerpt_new_start + edit.new.end;
2859 Edit {
2860 old: old_start..old_end,
2861 new: new_start..new_end,
2862 }
2863 }),
2864 );
2865
2866 new_excerpt = Excerpt::new(
2867 old_excerpt.id,
2868 locator.clone(),
2869 buffer_id,
2870 buffer.snapshot(),
2871 old_excerpt.range.clone(),
2872 old_excerpt.has_trailing_newline,
2873 );
2874 } else {
2875 new_excerpt = old_excerpt.clone();
2876 new_excerpt.buffer = buffer.snapshot();
2877 }
2878
2879 new_excerpts.push(new_excerpt, ());
2880 cursor.next();
2881 }
2882 new_excerpts.append(cursor.suffix(), ());
2883
2884 drop(cursor);
2885 *excerpts = new_excerpts;
2886 Self::sync_diff_transforms(snapshot, edits, DiffChangeKind::BufferEdited)
2887 }
2888
2889 fn sync_diff_transforms(
2890 snapshot: &mut MultiBufferSnapshot,
2891 excerpt_edits: Vec<text::Edit<ExcerptOffset>>,
2892 change_kind: DiffChangeKind,
2893 ) -> Vec<Edit<MultiBufferOffset>> {
2894 if excerpt_edits.is_empty() {
2895 return vec![];
2896 }
2897
2898 let mut excerpts = snapshot.excerpts.cursor::<ExcerptOffset>(());
2899 let mut old_diff_transforms = snapshot
2900 .diff_transforms
2901 .cursor::<Dimensions<ExcerptOffset, MultiBufferOffset>>(());
2902 let mut new_diff_transforms = SumTree::default();
2903 let mut old_expanded_hunks = HashSet::default();
2904 let mut output_edits = Vec::new();
2905 let mut output_delta = 0_isize;
2906 let mut at_transform_boundary = true;
2907 let mut end_of_current_insert = None;
2908
2909 let mut excerpt_edits = excerpt_edits.into_iter().peekable();
2910 while let Some(edit) = excerpt_edits.next() {
2911 excerpts.seek_forward(&edit.new.start, Bias::Right);
2912 if excerpts.item().is_none() && *excerpts.start() == edit.new.start {
2913 excerpts.prev();
2914 }
2915
2916 // Keep any transforms that are before the edit.
2917 if at_transform_boundary {
2918 at_transform_boundary = false;
2919 let transforms_before_edit = old_diff_transforms.slice(&edit.old.start, Bias::Left);
2920 Self::append_diff_transforms(&mut new_diff_transforms, transforms_before_edit);
2921 if let Some(transform) = old_diff_transforms.item()
2922 && old_diff_transforms.end().0 == edit.old.start
2923 && old_diff_transforms.start().0 < edit.old.start
2924 {
2925 Self::push_diff_transform(&mut new_diff_transforms, transform.clone());
2926 old_diff_transforms.next();
2927 }
2928 }
2929
2930 // Compute the start of the edit in output coordinates.
2931 let edit_start_overshoot = edit.old.start - old_diff_transforms.start().0;
2932 let edit_old_start = old_diff_transforms.start().1 + edit_start_overshoot;
2933 let edit_new_start =
2934 MultiBufferOffset((edit_old_start.0 as isize + output_delta) as usize);
2935
2936 let changed_diff_hunks = Self::recompute_diff_transforms_for_edit(
2937 &edit,
2938 &mut excerpts,
2939 &mut old_diff_transforms,
2940 &mut new_diff_transforms,
2941 &mut end_of_current_insert,
2942 &mut old_expanded_hunks,
2943 snapshot,
2944 change_kind,
2945 );
2946
2947 // Compute the end of the edit in output coordinates.
2948 let edit_old_end_overshoot = edit.old.end - old_diff_transforms.start().0;
2949 let edit_new_end_overshoot = edit.new.end - new_diff_transforms.summary().excerpt_len();
2950 let edit_old_end = old_diff_transforms.start().1 + edit_old_end_overshoot;
2951 let edit_new_end = new_diff_transforms.summary().output.len + edit_new_end_overshoot;
2952 let output_edit = Edit {
2953 old: edit_old_start..edit_old_end,
2954 new: edit_new_start..edit_new_end,
2955 };
2956
2957 output_delta += (output_edit.new.end - output_edit.new.start) as isize;
2958 output_delta -= (output_edit.old.end - output_edit.old.start) as isize;
2959 if changed_diff_hunks || matches!(change_kind, DiffChangeKind::BufferEdited) {
2960 output_edits.push(output_edit);
2961 }
2962
2963 // If this is the last edit that intersects the current diff transform,
2964 // then recreate the content up to the end of this transform, to prepare
2965 // for reusing additional slices of the old transforms.
2966 if excerpt_edits
2967 .peek()
2968 .is_none_or(|next_edit| next_edit.old.start >= old_diff_transforms.end().0)
2969 {
2970 let keep_next_old_transform = (old_diff_transforms.start().0 >= edit.old.end)
2971 && match old_diff_transforms.item() {
2972 Some(DiffTransform::BufferContent {
2973 inserted_hunk_info: Some(hunk),
2974 ..
2975 }) => excerpts.item().is_some_and(|excerpt| {
2976 hunk.hunk_start_anchor.is_valid(&excerpt.buffer)
2977 }),
2978 _ => true,
2979 };
2980
2981 let mut excerpt_offset = edit.new.end;
2982 if !keep_next_old_transform {
2983 excerpt_offset += old_diff_transforms.end().0 - edit.old.end;
2984 old_diff_transforms.next();
2985 }
2986
2987 old_expanded_hunks.clear();
2988 Self::push_buffer_content_transform(
2989 snapshot,
2990 &mut new_diff_transforms,
2991 excerpt_offset,
2992 end_of_current_insert,
2993 );
2994 at_transform_boundary = true;
2995 }
2996 }
2997
2998 // Keep any transforms that are after the last edit.
2999 Self::append_diff_transforms(&mut new_diff_transforms, old_diff_transforms.suffix());
3000
3001 // Ensure there's always at least one buffer content transform.
3002 if new_diff_transforms.is_empty() {
3003 new_diff_transforms.push(
3004 DiffTransform::BufferContent {
3005 summary: Default::default(),
3006 inserted_hunk_info: None,
3007 },
3008 (),
3009 );
3010 }
3011
3012 drop(old_diff_transforms);
3013 drop(excerpts);
3014 snapshot.diff_transforms = new_diff_transforms;
3015 snapshot.edit_count += 1;
3016
3017 #[cfg(any(test, feature = "test-support"))]
3018 snapshot.check_invariants();
3019 output_edits
3020 }
3021
3022 fn recompute_diff_transforms_for_edit(
3023 edit: &Edit<ExcerptOffset>,
3024 excerpts: &mut Cursor<Excerpt, ExcerptOffset>,
3025 old_diff_transforms: &mut Cursor<
3026 DiffTransform,
3027 Dimensions<ExcerptOffset, MultiBufferOffset>,
3028 >,
3029 new_diff_transforms: &mut SumTree<DiffTransform>,
3030 end_of_current_insert: &mut Option<(ExcerptOffset, DiffTransformHunkInfo)>,
3031 old_expanded_hunks: &mut HashSet<DiffTransformHunkInfo>,
3032 snapshot: &MultiBufferSnapshot,
3033 change_kind: DiffChangeKind,
3034 ) -> bool {
3035 log::trace!(
3036 "recomputing diff transform for edit {:?} => {:?}",
3037 edit.old.start..edit.old.end,
3038 edit.new.start..edit.new.end
3039 );
3040
3041 // Record which hunks were previously expanded.
3042 while let Some(item) = old_diff_transforms.item() {
3043 if let Some(hunk_info) = item.hunk_info() {
3044 log::trace!(
3045 "previously expanded hunk at {:?}",
3046 old_diff_transforms.start()
3047 );
3048 old_expanded_hunks.insert(hunk_info);
3049 }
3050 if old_diff_transforms.end().0 > edit.old.end {
3051 break;
3052 }
3053 old_diff_transforms.next();
3054 }
3055
3056 // Avoid querying diff hunks if there's no possibility of hunks being expanded.
3057 let all_diff_hunks_expanded = snapshot.all_diff_hunks_expanded;
3058 if old_expanded_hunks.is_empty()
3059 && change_kind == DiffChangeKind::BufferEdited
3060 && !all_diff_hunks_expanded
3061 {
3062 return false;
3063 }
3064
3065 // Visit each excerpt that intersects the edit.
3066 let mut did_expand_hunks = false;
3067 while let Some(excerpt) = excerpts.item() {
3068 // Recompute the expanded hunks in the portion of the excerpt that
3069 // intersects the edit.
3070 if let Some(diff) = snapshot.diffs.get(&excerpt.buffer_id) {
3071 let buffer = &excerpt.buffer;
3072 let excerpt_start = *excerpts.start();
3073 let excerpt_end = excerpt_start + excerpt.text_summary.len;
3074 let excerpt_buffer_start = excerpt.range.context.start.to_offset(buffer);
3075 let excerpt_buffer_end = excerpt_buffer_start + excerpt.text_summary.len;
3076 let edit_buffer_start =
3077 excerpt_buffer_start + edit.new.start.saturating_sub(excerpt_start);
3078 let edit_buffer_end =
3079 excerpt_buffer_start + edit.new.end.saturating_sub(excerpt_start);
3080 let edit_buffer_end = edit_buffer_end.min(excerpt_buffer_end);
3081 let edit_anchor_range =
3082 buffer.anchor_before(edit_buffer_start)..buffer.anchor_after(edit_buffer_end);
3083
3084 for hunk in diff.hunks_intersecting_range(edit_anchor_range, buffer) {
3085 if hunk.is_created_file() && !all_diff_hunks_expanded {
3086 continue;
3087 }
3088
3089 let hunk_buffer_range = hunk.buffer_range.to_offset(buffer);
3090 if hunk_buffer_range.start < excerpt_buffer_start {
3091 log::trace!("skipping hunk that starts before excerpt");
3092 continue;
3093 }
3094
3095 let hunk_info = DiffTransformHunkInfo {
3096 excerpt_id: excerpt.id,
3097 hunk_start_anchor: hunk.buffer_range.start,
3098 hunk_secondary_status: hunk.secondary_status,
3099 };
3100
3101 let hunk_excerpt_start = excerpt_start
3102 + hunk_buffer_range.start.saturating_sub(excerpt_buffer_start);
3103 let hunk_excerpt_end = excerpt_end
3104 .min(excerpt_start + (hunk_buffer_range.end - excerpt_buffer_start));
3105
3106 Self::push_buffer_content_transform(
3107 snapshot,
3108 new_diff_transforms,
3109 hunk_excerpt_start,
3110 *end_of_current_insert,
3111 );
3112
3113 // For every existing hunk, determine if it was previously expanded
3114 // and if it should currently be expanded.
3115 let was_previously_expanded = old_expanded_hunks.contains(&hunk_info);
3116 let should_expand_hunk = match &change_kind {
3117 DiffChangeKind::DiffUpdated { base_changed: true } => {
3118 was_previously_expanded || all_diff_hunks_expanded
3119 }
3120 DiffChangeKind::ExpandOrCollapseHunks { expand } => {
3121 let intersects = hunk_buffer_range.is_empty()
3122 || hunk_buffer_range.end > edit_buffer_start;
3123 if *expand {
3124 intersects || was_previously_expanded || all_diff_hunks_expanded
3125 } else {
3126 !intersects && (was_previously_expanded || all_diff_hunks_expanded)
3127 }
3128 }
3129 _ => was_previously_expanded || all_diff_hunks_expanded,
3130 };
3131
3132 if should_expand_hunk {
3133 did_expand_hunks = true;
3134 log::trace!(
3135 "expanding hunk {:?}, excerpt:{:?}",
3136 hunk_excerpt_start..hunk_excerpt_end,
3137 excerpt.id
3138 );
3139
3140 if !hunk.diff_base_byte_range.is_empty()
3141 && hunk_buffer_range.start >= edit_buffer_start
3142 && hunk_buffer_range.start <= excerpt_buffer_end
3143 {
3144 let base_text = diff.base_text();
3145 let mut text_cursor =
3146 base_text.as_rope().cursor(hunk.diff_base_byte_range.start);
3147 let mut base_text_summary =
3148 text_cursor.summary::<TextSummary>(hunk.diff_base_byte_range.end);
3149
3150 let mut has_trailing_newline = false;
3151 if base_text_summary.last_line_chars > 0 {
3152 base_text_summary += TextSummary::newline();
3153 has_trailing_newline = true;
3154 }
3155
3156 new_diff_transforms.push(
3157 DiffTransform::DeletedHunk {
3158 base_text_byte_range: hunk.diff_base_byte_range.clone(),
3159 summary: base_text_summary,
3160 buffer_id: excerpt.buffer_id,
3161 hunk_info,
3162 has_trailing_newline,
3163 },
3164 (),
3165 );
3166 }
3167
3168 if !hunk_buffer_range.is_empty() {
3169 *end_of_current_insert =
3170 Some((hunk_excerpt_end.min(excerpt_end), hunk_info));
3171 }
3172 }
3173 }
3174 }
3175
3176 if excerpts.end() <= edit.new.end {
3177 excerpts.next();
3178 } else {
3179 break;
3180 }
3181 }
3182
3183 did_expand_hunks || !old_expanded_hunks.is_empty()
3184 }
3185
3186 fn append_diff_transforms(
3187 new_transforms: &mut SumTree<DiffTransform>,
3188 subtree: SumTree<DiffTransform>,
3189 ) {
3190 if let Some(DiffTransform::BufferContent {
3191 inserted_hunk_info,
3192 summary,
3193 }) = subtree.first()
3194 && Self::extend_last_buffer_content_transform(
3195 new_transforms,
3196 *inserted_hunk_info,
3197 *summary,
3198 )
3199 {
3200 let mut cursor = subtree.cursor::<()>(());
3201 cursor.next();
3202 cursor.next();
3203 new_transforms.append(cursor.suffix(), ());
3204 return;
3205 }
3206 new_transforms.append(subtree, ());
3207 }
3208
3209 fn push_diff_transform(new_transforms: &mut SumTree<DiffTransform>, transform: DiffTransform) {
3210 if let DiffTransform::BufferContent {
3211 inserted_hunk_info: inserted_hunk_anchor,
3212 summary,
3213 } = transform
3214 && Self::extend_last_buffer_content_transform(
3215 new_transforms,
3216 inserted_hunk_anchor,
3217 summary,
3218 )
3219 {
3220 return;
3221 }
3222 new_transforms.push(transform, ());
3223 }
3224
3225 fn push_buffer_content_transform(
3226 old_snapshot: &MultiBufferSnapshot,
3227 new_transforms: &mut SumTree<DiffTransform>,
3228 end_offset: ExcerptOffset,
3229 current_inserted_hunk: Option<(ExcerptOffset, DiffTransformHunkInfo)>,
3230 ) {
3231 let inserted_region = current_inserted_hunk.map(|(insertion_end_offset, hunk_info)| {
3232 (end_offset.min(insertion_end_offset), Some(hunk_info))
3233 });
3234 let unchanged_region = [(end_offset, None)];
3235
3236 for (end_offset, inserted_hunk_info) in inserted_region.into_iter().chain(unchanged_region)
3237 {
3238 let start_offset = new_transforms.summary().excerpt_len();
3239 if end_offset <= start_offset {
3240 continue;
3241 }
3242 let summary_to_add = old_snapshot
3243 .text_summary_for_excerpt_offset_range::<MBTextSummary>(start_offset..end_offset);
3244
3245 if !Self::extend_last_buffer_content_transform(
3246 new_transforms,
3247 inserted_hunk_info,
3248 summary_to_add,
3249 ) {
3250 new_transforms.push(
3251 DiffTransform::BufferContent {
3252 summary: summary_to_add,
3253 inserted_hunk_info,
3254 },
3255 (),
3256 )
3257 }
3258 }
3259 }
3260
3261 fn extend_last_buffer_content_transform(
3262 new_transforms: &mut SumTree<DiffTransform>,
3263 new_inserted_hunk_info: Option<DiffTransformHunkInfo>,
3264 summary_to_add: MBTextSummary,
3265 ) -> bool {
3266 let mut did_extend = false;
3267 new_transforms.update_last(
3268 |last_transform| {
3269 if let DiffTransform::BufferContent {
3270 summary,
3271 inserted_hunk_info: inserted_hunk_anchor,
3272 } = last_transform
3273 && *inserted_hunk_anchor == new_inserted_hunk_info
3274 {
3275 *summary += summary_to_add;
3276 did_extend = true;
3277 }
3278 },
3279 (),
3280 );
3281 did_extend
3282 }
3283}
3284
3285fn build_excerpt_ranges(
3286 ranges: impl IntoIterator<Item = Range<Point>>,
3287 context_line_count: u32,
3288 buffer_snapshot: &BufferSnapshot,
3289) -> Vec<ExcerptRange<Point>> {
3290 ranges
3291 .into_iter()
3292 .map(|range| {
3293 let start_row = range.start.row.saturating_sub(context_line_count);
3294 let start = Point::new(start_row, 0);
3295 let end_row = (range.end.row + context_line_count).min(buffer_snapshot.max_point().row);
3296 let end = Point::new(end_row, buffer_snapshot.line_len(end_row));
3297 ExcerptRange {
3298 context: start..end,
3299 primary: range,
3300 }
3301 })
3302 .collect()
3303}
3304
3305#[cfg(any(test, feature = "test-support"))]
3306impl MultiBuffer {
3307 pub fn build_simple(text: &str, cx: &mut gpui::App) -> Entity<Self> {
3308 let buffer = cx.new(|cx| Buffer::local(text, cx));
3309 cx.new(|cx| Self::singleton(buffer, cx))
3310 }
3311
3312 pub fn build_multi<const COUNT: usize>(
3313 excerpts: [(&str, Vec<Range<Point>>); COUNT],
3314 cx: &mut gpui::App,
3315 ) -> Entity<Self> {
3316 let multi = cx.new(|_| Self::new(Capability::ReadWrite));
3317 for (text, ranges) in excerpts {
3318 let buffer = cx.new(|cx| Buffer::local(text, cx));
3319 let excerpt_ranges = ranges.into_iter().map(ExcerptRange::new);
3320 multi.update(cx, |multi, cx| {
3321 multi.push_excerpts(buffer, excerpt_ranges, cx)
3322 });
3323 }
3324
3325 multi
3326 }
3327
3328 pub fn build_from_buffer(buffer: Entity<Buffer>, cx: &mut gpui::App) -> Entity<Self> {
3329 cx.new(|cx| Self::singleton(buffer, cx))
3330 }
3331
3332 pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::App) -> Entity<Self> {
3333 cx.new(|cx| {
3334 let mut multibuffer = MultiBuffer::new(Capability::ReadWrite);
3335 let mutation_count = rng.random_range(1..=5);
3336 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
3337 multibuffer
3338 })
3339 }
3340
3341 pub fn randomly_edit(
3342 &mut self,
3343 rng: &mut impl rand::Rng,
3344 edit_count: usize,
3345 cx: &mut Context<Self>,
3346 ) {
3347 use util::RandomCharIter;
3348
3349 let snapshot = self.read(cx);
3350 let mut edits: Vec<(Range<MultiBufferOffset>, Arc<str>)> = Vec::new();
3351 let mut last_end = None;
3352 for _ in 0..edit_count {
3353 if last_end.is_some_and(|last_end| last_end >= snapshot.len()) {
3354 break;
3355 }
3356
3357 let new_start = last_end.map_or(MultiBufferOffset::ZERO, |last_end| last_end + 1usize);
3358 let end =
3359 snapshot.clip_offset(rng.random_range(new_start..=snapshot.len()), Bias::Right);
3360 let start = snapshot.clip_offset(rng.random_range(new_start..=end), Bias::Right);
3361 last_end = Some(end);
3362
3363 let mut range = start..end;
3364 if rng.random_bool(0.2) {
3365 mem::swap(&mut range.start, &mut range.end);
3366 }
3367
3368 let new_text_len = rng.random_range(0..10);
3369 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
3370
3371 edits.push((range, new_text.into()));
3372 }
3373 log::info!("mutating multi-buffer with {:?}", edits);
3374 drop(snapshot);
3375
3376 self.edit(edits, None, cx);
3377 }
3378
3379 pub fn randomly_edit_excerpts(
3380 &mut self,
3381 rng: &mut impl rand::Rng,
3382 mutation_count: usize,
3383 cx: &mut Context<Self>,
3384 ) {
3385 use rand::prelude::*;
3386 use std::env;
3387 use util::RandomCharIter;
3388
3389 let max_excerpts = env::var("MAX_EXCERPTS")
3390 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
3391 .unwrap_or(5);
3392
3393 let mut buffers = Vec::new();
3394 for _ in 0..mutation_count {
3395 if rng.random_bool(0.05) {
3396 log::info!("Clearing multi-buffer");
3397 self.clear(cx);
3398 continue;
3399 } else if rng.random_bool(0.1) && !self.excerpt_ids().is_empty() {
3400 let ids = self.excerpt_ids();
3401 let mut excerpts = HashSet::default();
3402 for _ in 0..rng.random_range(0..ids.len()) {
3403 excerpts.extend(ids.choose(rng).copied());
3404 }
3405
3406 let line_count = rng.random_range(0..5);
3407
3408 log::info!("Expanding excerpts {excerpts:?} by {line_count} lines");
3409
3410 self.expand_excerpts(
3411 excerpts.iter().cloned(),
3412 line_count,
3413 ExpandExcerptDirection::UpAndDown,
3414 cx,
3415 );
3416 continue;
3417 }
3418
3419 let excerpt_ids = self.excerpt_ids();
3420 if excerpt_ids.is_empty() || (rng.random() && excerpt_ids.len() < max_excerpts) {
3421 let buffer_handle = if rng.random() || self.buffers.is_empty() {
3422 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
3423 buffers.push(cx.new(|cx| Buffer::local(text, cx)));
3424 let buffer = buffers.last().unwrap().read(cx);
3425 log::info!(
3426 "Creating new buffer {} with text: {:?}",
3427 buffer.remote_id(),
3428 buffer.text()
3429 );
3430 buffers.last().unwrap().clone()
3431 } else {
3432 self.buffers.values().choose(rng).unwrap().buffer.clone()
3433 };
3434
3435 let buffer = buffer_handle.read(cx);
3436 let buffer_text = buffer.text();
3437 let ranges = (0..rng.random_range(0..5))
3438 .map(|_| {
3439 let end_ix =
3440 buffer.clip_offset(rng.random_range(0..=buffer.len()), Bias::Right);
3441 let start_ix = buffer.clip_offset(rng.random_range(0..=end_ix), Bias::Left);
3442 ExcerptRange::new(start_ix..end_ix)
3443 })
3444 .collect::<Vec<_>>();
3445 log::info!(
3446 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
3447 buffer_handle.read(cx).remote_id(),
3448 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
3449 ranges
3450 .iter()
3451 .map(|r| &buffer_text[r.context.clone()])
3452 .collect::<Vec<_>>()
3453 );
3454
3455 let excerpt_id = self.push_excerpts(buffer_handle.clone(), ranges, cx);
3456 log::info!("Inserted with ids: {:?}", excerpt_id);
3457 } else {
3458 let remove_count = rng.random_range(1..=excerpt_ids.len());
3459 let mut excerpts_to_remove = excerpt_ids
3460 .choose_multiple(rng, remove_count)
3461 .cloned()
3462 .collect::<Vec<_>>();
3463 let snapshot = self.snapshot.borrow();
3464 excerpts_to_remove.sort_unstable_by(|a, b| a.cmp(b, &snapshot));
3465 drop(snapshot);
3466 log::info!("Removing excerpts {:?}", excerpts_to_remove);
3467 self.remove_excerpts(excerpts_to_remove, cx);
3468 }
3469 }
3470 }
3471
3472 pub fn randomly_mutate(
3473 &mut self,
3474 rng: &mut impl rand::Rng,
3475 mutation_count: usize,
3476 cx: &mut Context<Self>,
3477 ) {
3478 use rand::prelude::*;
3479
3480 if rng.random_bool(0.7) || self.singleton {
3481 let buffer = self
3482 .buffers
3483 .values()
3484 .choose(rng)
3485 .map(|state| state.buffer.clone());
3486
3487 if let Some(buffer) = buffer {
3488 buffer.update(cx, |buffer, cx| {
3489 if rng.random() {
3490 buffer.randomly_edit(rng, mutation_count, cx);
3491 } else {
3492 buffer.randomly_undo_redo(rng, cx);
3493 }
3494 });
3495 } else {
3496 self.randomly_edit(rng, mutation_count, cx);
3497 }
3498 } else {
3499 self.randomly_edit_excerpts(rng, mutation_count, cx);
3500 }
3501
3502 self.check_invariants(cx);
3503 }
3504
3505 fn check_invariants(&self, cx: &App) {
3506 self.read(cx).check_invariants();
3507 }
3508}
3509
3510impl EventEmitter<Event> for MultiBuffer {}
3511
3512impl MultiBufferSnapshot {
3513 pub fn text(&self) -> String {
3514 self.chunks(MultiBufferOffset::ZERO..self.len(), false)
3515 .map(|chunk| chunk.text)
3516 .collect()
3517 }
3518
3519 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3520 self.reversed_chunks_in_range(MultiBufferOffset::ZERO..position.to_offset(self))
3521 .flat_map(|c| c.chars().rev())
3522 }
3523
3524 fn reversed_chunks_in_range(
3525 &self,
3526 range: Range<MultiBufferOffset>,
3527 ) -> ReversedMultiBufferChunks<'_> {
3528 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3529 cursor.seek(&range.end);
3530 let current_chunks = cursor.region().as_ref().map(|region| {
3531 let start_overshoot = range.start.saturating_sub(region.range.start);
3532 let end_overshoot = range.end - region.range.start;
3533 let end = (region.buffer_range.start + end_overshoot).min(region.buffer_range.end);
3534 let start = region.buffer_range.start + start_overshoot;
3535 region.buffer.reversed_chunks_in_range(start..end)
3536 });
3537 ReversedMultiBufferChunks {
3538 cursor,
3539 current_chunks,
3540 start: range.start,
3541 offset: range.end,
3542 }
3543 }
3544
3545 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
3546 let offset = position.to_offset(self);
3547 self.text_for_range(offset..self.len())
3548 .flat_map(|chunk| chunk.chars())
3549 }
3550
3551 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
3552 self.chunks(range, false).map(|chunk| chunk.text)
3553 }
3554
3555 pub fn is_line_blank(&self, row: MultiBufferRow) -> bool {
3556 self.text_for_range(Point::new(row.0, 0)..Point::new(row.0, self.line_len(row)))
3557 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
3558 }
3559
3560 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
3561 where
3562 T: ToOffset,
3563 {
3564 let position = position.to_offset(self);
3565 position == self.clip_offset(position, Bias::Left)
3566 && self
3567 .bytes_in_range(position..self.len())
3568 .flatten()
3569 .copied()
3570 .take(needle.len())
3571 .eq(needle.bytes())
3572 }
3573
3574 pub fn diff_hunks(&self) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3575 self.diff_hunks_in_range(Anchor::min()..Anchor::max())
3576 }
3577
3578 pub fn diff_hunks_in_range<T: ToPoint>(
3579 &self,
3580 range: Range<T>,
3581 ) -> impl Iterator<Item = MultiBufferDiffHunk> + '_ {
3582 let query_range = range.start.to_point(self)..range.end.to_point(self);
3583 self.lift_buffer_metadata(query_range.clone(), move |buffer, buffer_range| {
3584 let diff = self.diffs.get(&buffer.remote_id())?;
3585 let buffer_start = buffer.anchor_before(buffer_range.start);
3586 let buffer_end = buffer.anchor_after(buffer_range.end);
3587 Some(
3588 diff.hunks_intersecting_range(buffer_start..buffer_end, buffer)
3589 .filter_map(|hunk| {
3590 if hunk.is_created_file() && !self.all_diff_hunks_expanded {
3591 return None;
3592 }
3593 Some((hunk.range.clone(), hunk))
3594 }),
3595 )
3596 })
3597 .filter_map(move |(range, hunk, excerpt)| {
3598 if range.start != range.end && range.end == query_range.start && !hunk.range.is_empty()
3599 {
3600 return None;
3601 }
3602 let end_row = if range.end.column == 0 {
3603 range.end.row
3604 } else {
3605 range.end.row + 1
3606 };
3607 Some(MultiBufferDiffHunk {
3608 row_range: MultiBufferRow(range.start.row)..MultiBufferRow(end_row),
3609 buffer_id: excerpt.buffer_id,
3610 excerpt_id: excerpt.id,
3611 buffer_range: hunk.buffer_range.clone(),
3612 diff_base_byte_range: BufferOffset(hunk.diff_base_byte_range.start)
3613 ..BufferOffset(hunk.diff_base_byte_range.end),
3614 secondary_status: hunk.secondary_status,
3615 })
3616 })
3617 }
3618
3619 pub fn excerpt_ids_for_range<T: ToOffset>(
3620 &self,
3621 range: Range<T>,
3622 ) -> impl Iterator<Item = ExcerptId> + '_ {
3623 let range = range.start.to_offset(self)..range.end.to_offset(self);
3624 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3625 cursor.seek(&range.start);
3626 std::iter::from_fn(move || {
3627 let region = cursor.region()?;
3628 if region.range.start >= range.end {
3629 return None;
3630 }
3631 cursor.next_excerpt();
3632 Some(region.excerpt.id)
3633 })
3634 }
3635
3636 pub fn buffer_ids_for_range<T: ToOffset>(
3637 &self,
3638 range: Range<T>,
3639 ) -> impl Iterator<Item = BufferId> + '_ {
3640 let range = range.start.to_offset(self)..range.end.to_offset(self);
3641 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3642 cursor.seek(&range.start);
3643 std::iter::from_fn(move || {
3644 let region = cursor.region()?;
3645 if region.range.start > range.end
3646 || region.range.start == range.end && region.range.start > range.start
3647 {
3648 return None;
3649 }
3650 cursor.next_excerpt();
3651 Some(region.excerpt.buffer_id)
3652 })
3653 }
3654
3655 pub fn ranges_to_buffer_ranges<T: ToOffset>(
3656 &self,
3657 ranges: impl Iterator<Item = Range<T>>,
3658 ) -> impl Iterator<Item = (&BufferSnapshot, Range<BufferOffset>, ExcerptId)> {
3659 ranges.flat_map(|range| self.range_to_buffer_ranges(range).into_iter())
3660 }
3661
3662 pub fn range_to_buffer_ranges<T: ToOffset>(
3663 &self,
3664 range: Range<T>,
3665 ) -> Vec<(&BufferSnapshot, Range<BufferOffset>, ExcerptId)> {
3666 let start = range.start.to_offset(self);
3667 let end = range.end.to_offset(self);
3668
3669 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3670 cursor.seek(&start);
3671
3672 let mut result: Vec<(&BufferSnapshot, Range<BufferOffset>, ExcerptId)> = Vec::new();
3673 while let Some(region) = cursor.region() {
3674 if region.range.start > end {
3675 break;
3676 }
3677 if region.is_main_buffer {
3678 let start_overshoot = start.saturating_sub(region.range.start);
3679 let end_overshoot = end.saturating_sub(region.range.start);
3680 let start = region
3681 .buffer_range
3682 .end
3683 .min(region.buffer_range.start + start_overshoot);
3684 let end = region
3685 .buffer_range
3686 .end
3687 .min(region.buffer_range.start + end_overshoot);
3688 if let Some(prev) = result.last_mut().filter(|(_, prev_range, excerpt_id)| {
3689 *excerpt_id == region.excerpt.id && prev_range.end == start
3690 }) {
3691 prev.1.end = end;
3692 } else {
3693 result.push((region.buffer, start..end, region.excerpt.id));
3694 }
3695 }
3696 cursor.next();
3697 }
3698 result
3699 }
3700
3701 pub fn range_to_buffer_ranges_with_deleted_hunks<T: ToOffset>(
3702 &self,
3703 range: Range<T>,
3704 ) -> impl Iterator<
3705 Item = (
3706 &BufferSnapshot,
3707 Range<BufferOffset>,
3708 ExcerptId,
3709 Option<Anchor>,
3710 ),
3711 > + '_ {
3712 let start = range.start.to_offset(self);
3713 let end = range.end.to_offset(self);
3714
3715 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
3716 cursor.seek(&start);
3717
3718 std::iter::from_fn(move || {
3719 let region = cursor.region()?;
3720 if region.range.start > end {
3721 return None;
3722 }
3723 let start_overshoot = start.saturating_sub(region.range.start);
3724 let end_overshoot = end.saturating_sub(region.range.start);
3725 let start = region
3726 .buffer_range
3727 .end
3728 .min(region.buffer_range.start + start_overshoot);
3729 let end = region
3730 .buffer_range
3731 .end
3732 .min(region.buffer_range.start + end_overshoot);
3733
3734 let region_excerpt_id = region.excerpt.id;
3735 let deleted_hunk_anchor = if region.is_main_buffer {
3736 None
3737 } else {
3738 Some(self.anchor_before(region.range.start))
3739 };
3740 let result = (
3741 region.buffer,
3742 start..end,
3743 region_excerpt_id,
3744 deleted_hunk_anchor,
3745 );
3746 cursor.next();
3747 Some(result)
3748 })
3749 }
3750
3751 /// Retrieves buffer metadata for the given range, and converts it into multi-buffer
3752 /// coordinates.
3753 ///
3754 /// The given callback will be called for every excerpt intersecting the given range. It will
3755 /// be passed the excerpt's buffer and the buffer range that the input range intersects.
3756 /// The callback should return an iterator of metadata items from that buffer, each paired
3757 /// with a buffer range.
3758 ///
3759 /// The returned iterator yields each of these metadata items, paired with its range in
3760 /// multi-buffer coordinates.
3761 fn lift_buffer_metadata<'a, MBD, M, I>(
3762 &'a self,
3763 query_range: Range<MBD>,
3764 get_buffer_metadata: impl 'a + Fn(&'a BufferSnapshot, Range<MBD::TextDimension>) -> Option<I>,
3765 ) -> impl Iterator<Item = (Range<MBD>, M, &'a Excerpt)> + 'a
3766 where
3767 I: Iterator<Item = (Range<MBD::TextDimension>, M)> + 'a,
3768 MBD: MultiBufferDimension
3769 + Ord
3770 + Sub<Output = MBD::TextDimension>
3771 + ops::Add<MBD::TextDimension, Output = MBD>
3772 + ops::AddAssign<MBD::TextDimension>,
3773 MBD::TextDimension: Sub<Output = MBD::TextDimension>
3774 + ops::Add<Output = MBD::TextDimension>
3775 + AddAssign<MBD::TextDimension>
3776 + Ord,
3777 {
3778 let mut current_excerpt_metadata: Option<(ExcerptId, I)> = None;
3779 let mut cursor = self.cursor::<MBD, MBD::TextDimension>();
3780
3781 // Find the excerpt and buffer offset where the given range ends.
3782 cursor.seek(&query_range.end);
3783 let mut range_end = None;
3784 while let Some(region) = cursor.region() {
3785 if region.is_main_buffer {
3786 let mut buffer_end = region.buffer_range.start;
3787 let overshoot = if query_range.end > region.range.start {
3788 query_range.end - region.range.start
3789 } else {
3790 <MBD::TextDimension>::default()
3791 };
3792 buffer_end = buffer_end + overshoot;
3793 range_end = Some((region.excerpt.id, buffer_end));
3794 break;
3795 }
3796 cursor.next();
3797 }
3798
3799 cursor.seek(&query_range.start);
3800
3801 if let Some(region) = cursor.region().filter(|region| !region.is_main_buffer)
3802 && region.range.start > MBD::default()
3803 {
3804 cursor.prev()
3805 }
3806
3807 iter::from_fn(move || {
3808 loop {
3809 let excerpt = cursor.excerpt()?;
3810
3811 // If we have already retrieved metadata for this excerpt, continue to use it.
3812 let metadata_iter = if let Some((_, metadata)) = current_excerpt_metadata
3813 .as_mut()
3814 .filter(|(excerpt_id, _)| *excerpt_id == excerpt.id)
3815 {
3816 Some(metadata)
3817 }
3818 // Otherwise, compute the intersection of the input range with the excerpt's range,
3819 // and retrieve the metadata for the resulting range.
3820 else {
3821 let region = cursor.region()?;
3822 let mut buffer_start;
3823 if region.is_main_buffer {
3824 buffer_start = region.buffer_range.start;
3825 if query_range.start > region.range.start {
3826 let overshoot = query_range.start - region.range.start;
3827 buffer_start = buffer_start + overshoot;
3828 }
3829 buffer_start = buffer_start.min(region.buffer_range.end);
3830 } else {
3831 buffer_start = cursor.main_buffer_position()?;
3832 };
3833 let mut buffer_end = excerpt
3834 .range
3835 .context
3836 .end
3837 .summary::<MBD::TextDimension>(&excerpt.buffer);
3838 if let Some((end_excerpt_id, end_buffer_offset)) = range_end
3839 && excerpt.id == end_excerpt_id
3840 {
3841 buffer_end = buffer_end.min(end_buffer_offset);
3842 }
3843
3844 get_buffer_metadata(&excerpt.buffer, buffer_start..buffer_end).map(|iterator| {
3845 &mut current_excerpt_metadata.insert((excerpt.id, iterator)).1
3846 })
3847 };
3848
3849 // Visit each metadata item.
3850 if let Some((metadata_buffer_range, metadata)) =
3851 metadata_iter.and_then(Iterator::next)
3852 {
3853 // Find the multibuffer regions that contain the start and end of
3854 // the metadata item's range.
3855 if metadata_buffer_range.start > <MBD::TextDimension>::default() {
3856 while let Some(region) = cursor.region() {
3857 if region.is_main_buffer
3858 && (region.buffer_range.end >= metadata_buffer_range.start
3859 || cursor.is_at_end_of_excerpt())
3860 {
3861 break;
3862 }
3863 cursor.next();
3864 }
3865 }
3866 let start_region = cursor.region()?;
3867 while let Some(region) = cursor.region() {
3868 if region.is_main_buffer
3869 && (region.buffer_range.end > metadata_buffer_range.end
3870 || cursor.is_at_end_of_excerpt())
3871 {
3872 break;
3873 }
3874 cursor.next();
3875 }
3876 let end_region = cursor.region();
3877
3878 // Convert the metadata item's range into multibuffer coordinates.
3879 let mut start_position = start_region.range.start;
3880 let region_buffer_start = start_region.buffer_range.start;
3881 if start_region.is_main_buffer
3882 && metadata_buffer_range.start > region_buffer_start
3883 {
3884 start_position =
3885 start_position + (metadata_buffer_range.start - region_buffer_start);
3886 start_position = start_position.min(start_region.range.end);
3887 }
3888
3889 let mut end_position = self.max_position();
3890 if let Some(end_region) = &end_region {
3891 end_position = end_region.range.start;
3892 debug_assert!(end_region.is_main_buffer);
3893 let region_buffer_start = end_region.buffer_range.start;
3894 if metadata_buffer_range.end > region_buffer_start {
3895 end_position =
3896 end_position + (metadata_buffer_range.end - region_buffer_start);
3897 }
3898 end_position = end_position.min(end_region.range.end);
3899 }
3900
3901 if start_position <= query_range.end && end_position >= query_range.start {
3902 return Some((start_position..end_position, metadata, excerpt));
3903 }
3904 }
3905 // When there are no more metadata items for this excerpt, move to the next excerpt.
3906 else {
3907 current_excerpt_metadata.take();
3908 if let Some((end_excerpt_id, _)) = range_end
3909 && excerpt.id == end_excerpt_id
3910 {
3911 return None;
3912 }
3913 cursor.next_excerpt();
3914 }
3915 }
3916 })
3917 }
3918
3919 pub fn diff_hunk_before<T: ToOffset>(&self, position: T) -> Option<MultiBufferRow> {
3920 let offset = position.to_offset(self);
3921
3922 let mut cursor = self
3923 .cursor::<DimensionPair<MultiBufferOffset, Point>, DimensionPair<BufferOffset, Point>>(
3924 );
3925 cursor.seek(&DimensionPair {
3926 key: offset,
3927 value: None,
3928 });
3929 cursor.seek_to_start_of_current_excerpt();
3930 let excerpt = cursor.excerpt()?;
3931
3932 let excerpt_end = excerpt.range.context.end.to_offset(&excerpt.buffer);
3933 let current_position = self
3934 .anchor_before(offset)
3935 .text_anchor
3936 .to_offset(&excerpt.buffer);
3937 let excerpt_end = excerpt
3938 .buffer
3939 .anchor_before(excerpt_end.min(current_position));
3940
3941 if let Some(diff) = self.diffs.get(&excerpt.buffer_id) {
3942 for hunk in diff.hunks_intersecting_range_rev(
3943 excerpt.range.context.start..excerpt_end,
3944 &excerpt.buffer,
3945 ) {
3946 let hunk_end = hunk.buffer_range.end.to_offset(&excerpt.buffer);
3947 if hunk_end >= current_position {
3948 continue;
3949 }
3950 let start =
3951 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, hunk.buffer_range.start)
3952 .to_point(self);
3953 return Some(MultiBufferRow(start.row));
3954 }
3955 }
3956
3957 loop {
3958 cursor.prev_excerpt();
3959 let excerpt = cursor.excerpt()?;
3960
3961 let Some(diff) = self.diffs.get(&excerpt.buffer_id) else {
3962 continue;
3963 };
3964 let mut hunks =
3965 diff.hunks_intersecting_range_rev(excerpt.range.context.clone(), &excerpt.buffer);
3966 let Some(hunk) = hunks.next() else {
3967 continue;
3968 };
3969 let start = Anchor::in_buffer(excerpt.id, excerpt.buffer_id, hunk.buffer_range.start)
3970 .to_point(self);
3971 return Some(MultiBufferRow(start.row));
3972 }
3973 }
3974
3975 pub fn has_diff_hunks(&self) -> bool {
3976 self.diffs.values().any(|diff| !diff.is_empty())
3977 }
3978
3979 pub fn is_inside_word<T: ToOffset>(
3980 &self,
3981 position: T,
3982 scope_context: Option<CharScopeContext>,
3983 ) -> bool {
3984 let position = position.to_offset(self);
3985 let classifier = self
3986 .char_classifier_at(position)
3987 .scope_context(scope_context);
3988 let next_char_kind = self.chars_at(position).next().map(|c| classifier.kind(c));
3989 let prev_char_kind = self
3990 .reversed_chars_at(position)
3991 .next()
3992 .map(|c| classifier.kind(c));
3993 prev_char_kind.zip(next_char_kind) == Some((CharKind::Word, CharKind::Word))
3994 }
3995
3996 pub fn surrounding_word<T: ToOffset>(
3997 &self,
3998 start: T,
3999 scope_context: Option<CharScopeContext>,
4000 ) -> (Range<MultiBufferOffset>, Option<CharKind>) {
4001 let mut start = start.to_offset(self);
4002 let mut end = start;
4003 let mut next_chars = self.chars_at(start).peekable();
4004 let mut prev_chars = self.reversed_chars_at(start).peekable();
4005
4006 let classifier = self.char_classifier_at(start).scope_context(scope_context);
4007
4008 let word_kind = cmp::max(
4009 prev_chars.peek().copied().map(|c| classifier.kind(c)),
4010 next_chars.peek().copied().map(|c| classifier.kind(c)),
4011 );
4012
4013 for ch in prev_chars {
4014 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4015 start -= ch.len_utf8();
4016 } else {
4017 break;
4018 }
4019 }
4020
4021 for ch in next_chars {
4022 if Some(classifier.kind(ch)) == word_kind && ch != '\n' {
4023 end += ch.len_utf8();
4024 } else {
4025 break;
4026 }
4027 }
4028
4029 (start..end, word_kind)
4030 }
4031
4032 pub fn char_kind_before<T: ToOffset>(
4033 &self,
4034 start: T,
4035 scope_context: Option<CharScopeContext>,
4036 ) -> Option<CharKind> {
4037 let start = start.to_offset(self);
4038 let classifier = self.char_classifier_at(start).scope_context(scope_context);
4039 self.reversed_chars_at(start)
4040 .next()
4041 .map(|ch| classifier.kind(ch))
4042 }
4043
4044 pub fn is_singleton(&self) -> bool {
4045 self.singleton
4046 }
4047
4048 pub fn as_singleton(&self) -> Option<(&ExcerptId, BufferId, &BufferSnapshot)> {
4049 if self.singleton {
4050 self.excerpts
4051 .iter()
4052 .next()
4053 .map(|e| (&e.id, e.buffer_id, &e.buffer))
4054 } else {
4055 None
4056 }
4057 }
4058
4059 pub fn len(&self) -> MultiBufferOffset {
4060 self.diff_transforms.summary().output.len
4061 }
4062
4063 pub fn max_position<MBD: MultiBufferDimension>(&self) -> MBD {
4064 MBD::from_summary(&self.text_summary())
4065 }
4066
4067 pub fn is_empty(&self) -> bool {
4068 self.diff_transforms.summary().output.len == MultiBufferOffset(0)
4069 }
4070
4071 pub fn widest_line_number(&self) -> u32 {
4072 // widest_line_number is 0-based, so 1 is added to get the displayed line number.
4073 self.excerpts.summary().widest_line_number + 1
4074 }
4075
4076 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes<'_> {
4077 let range = range.start.to_offset(self)..range.end.to_offset(self);
4078 let mut excerpts = self.cursor::<MultiBufferOffset, BufferOffset>();
4079 excerpts.seek(&range.start);
4080
4081 let mut chunk;
4082 let mut has_trailing_newline;
4083 let excerpt_bytes;
4084 if let Some(region) = excerpts.region() {
4085 let mut bytes = region.buffer.bytes_in_range(
4086 region.buffer_range.start + (range.start - region.range.start)
4087 ..(region.buffer_range.start + (range.end - region.range.start))
4088 .min(region.buffer_range.end),
4089 );
4090 chunk = bytes.next().unwrap_or(&[][..]);
4091 excerpt_bytes = Some(bytes);
4092 has_trailing_newline = region.has_trailing_newline && range.end >= region.range.end;
4093 if chunk.is_empty() && has_trailing_newline {
4094 chunk = b"\n";
4095 has_trailing_newline = false;
4096 }
4097 } else {
4098 chunk = &[][..];
4099 excerpt_bytes = None;
4100 has_trailing_newline = false;
4101 };
4102
4103 MultiBufferBytes {
4104 range,
4105 cursor: excerpts,
4106 excerpt_bytes,
4107 has_trailing_newline,
4108 chunk,
4109 }
4110 }
4111
4112 pub fn reversed_bytes_in_range<T: ToOffset>(
4113 &self,
4114 range: Range<T>,
4115 ) -> ReversedMultiBufferBytes<'_> {
4116 let range = range.start.to_offset(self)..range.end.to_offset(self);
4117 let mut chunks = self.reversed_chunks_in_range(range.clone());
4118 let chunk = chunks.next().map_or(&[][..], |c| c.as_bytes());
4119 ReversedMultiBufferBytes {
4120 range,
4121 chunks,
4122 chunk,
4123 }
4124 }
4125
4126 pub fn row_infos(&self, start_row: MultiBufferRow) -> MultiBufferRows<'_> {
4127 let mut cursor = self.cursor::<Point, Point>();
4128 cursor.seek(&Point::new(start_row.0, 0));
4129 let mut result = MultiBufferRows {
4130 point: Point::new(0, 0),
4131 is_empty: self.excerpts.is_empty(),
4132 is_singleton: self.is_singleton(),
4133 cursor,
4134 };
4135 result.seek(start_row);
4136 result
4137 }
4138
4139 pub fn chunks<T: ToOffset>(
4140 &self,
4141 range: Range<T>,
4142 language_aware: bool,
4143 ) -> MultiBufferChunks<'_> {
4144 let mut chunks = MultiBufferChunks {
4145 excerpt_offset_range: ExcerptDimension(MultiBufferOffset::ZERO)
4146 ..ExcerptDimension(MultiBufferOffset::ZERO),
4147 range: MultiBufferOffset::ZERO..MultiBufferOffset::ZERO,
4148 excerpts: self.excerpts.cursor(()),
4149 diff_transforms: self.diff_transforms.cursor(()),
4150 diffs: &self.diffs,
4151 diff_base_chunks: None,
4152 excerpt_chunks: None,
4153 buffer_chunk: None,
4154 language_aware,
4155 };
4156 let range = range.start.to_offset(self)..range.end.to_offset(self);
4157 chunks.seek(range);
4158 chunks
4159 }
4160
4161 pub fn clip_offset(&self, offset: MultiBufferOffset, bias: Bias) -> MultiBufferOffset {
4162 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset)
4163 }
4164
4165 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
4166 self.clip_dimension(point, bias, text::BufferSnapshot::clip_point)
4167 }
4168
4169 pub fn clip_offset_utf16(
4170 &self,
4171 offset: MultiBufferOffsetUtf16,
4172 bias: Bias,
4173 ) -> MultiBufferOffsetUtf16 {
4174 self.clip_dimension(offset, bias, text::BufferSnapshot::clip_offset_utf16)
4175 }
4176
4177 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
4178 self.clip_dimension(point.0, bias, |buffer, point, bias| {
4179 buffer.clip_point_utf16(Unclipped(point), bias)
4180 })
4181 }
4182
4183 pub fn offset_to_point(&self, offset: MultiBufferOffset) -> Point {
4184 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point)
4185 }
4186
4187 pub fn offset_to_point_utf16(&self, offset: MultiBufferOffset) -> PointUtf16 {
4188 self.convert_dimension(offset, text::BufferSnapshot::offset_to_point_utf16)
4189 }
4190
4191 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
4192 self.convert_dimension(point, text::BufferSnapshot::point_to_point_utf16)
4193 }
4194
4195 pub fn point_utf16_to_point(&self, point: PointUtf16) -> Point {
4196 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_point)
4197 }
4198
4199 pub fn point_to_offset(&self, point: Point) -> MultiBufferOffset {
4200 self.convert_dimension(point, text::BufferSnapshot::point_to_offset)
4201 }
4202
4203 pub fn point_to_offset_utf16(&self, point: Point) -> MultiBufferOffsetUtf16 {
4204 self.convert_dimension(point, text::BufferSnapshot::point_to_offset_utf16)
4205 }
4206
4207 pub fn offset_utf16_to_offset(&self, offset: MultiBufferOffsetUtf16) -> MultiBufferOffset {
4208 self.convert_dimension(offset, text::BufferSnapshot::offset_utf16_to_offset)
4209 }
4210
4211 pub fn offset_to_offset_utf16(&self, offset: MultiBufferOffset) -> MultiBufferOffsetUtf16 {
4212 self.convert_dimension(offset, text::BufferSnapshot::offset_to_offset_utf16)
4213 }
4214
4215 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> MultiBufferOffset {
4216 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_offset)
4217 }
4218
4219 pub fn point_utf16_to_offset_utf16(&self, point: PointUtf16) -> MultiBufferOffsetUtf16 {
4220 self.convert_dimension(point, text::BufferSnapshot::point_utf16_to_offset_utf16)
4221 }
4222
4223 fn clip_dimension<MBD, BD>(
4224 &self,
4225 position: MBD,
4226 bias: Bias,
4227 clip_buffer_position: fn(&text::BufferSnapshot, BD, Bias) -> BD,
4228 ) -> MBD
4229 where
4230 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
4231 BD: TextDimension + Sub<Output = <MBD as Sub>::Output> + AddAssign<<MBD as Sub>::Output>,
4232 {
4233 let mut cursor = self.cursor::<MBD, BD>();
4234 cursor.seek(&position);
4235 if let Some(region) = cursor.region() {
4236 if position >= region.range.end {
4237 return region.range.end;
4238 }
4239 let overshoot = position - region.range.start;
4240 let mut buffer_position = region.buffer_range.start;
4241 buffer_position += overshoot;
4242 let clipped_buffer_position =
4243 clip_buffer_position(region.buffer, buffer_position, bias);
4244 let mut position = region.range.start;
4245 position += clipped_buffer_position - region.buffer_range.start;
4246 position
4247 } else {
4248 self.max_position()
4249 }
4250 }
4251
4252 fn convert_dimension<MBR1, MBR2, BR1, BR2>(
4253 &self,
4254 key: MBR1,
4255 convert_buffer_dimension: fn(&text::BufferSnapshot, BR1) -> BR2,
4256 ) -> MBR2
4257 where
4258 MBR1: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBR1 as Sub>::Output>,
4259 BR1: TextDimension + Sub<Output = <MBR1 as Sub>::Output> + AddAssign<<MBR1 as Sub>::Output>,
4260 MBR2: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBR2 as Sub>::Output>,
4261 BR2: TextDimension + Sub<Output = <MBR2 as Sub>::Output> + AddAssign<<MBR2 as Sub>::Output>,
4262 {
4263 let mut cursor = self.cursor::<DimensionPair<MBR1, MBR2>, DimensionPair<BR1, BR2>>();
4264 cursor.seek(&DimensionPair { key, value: None });
4265 if let Some(region) = cursor.region() {
4266 if key >= region.range.end.key {
4267 return region.range.end.value.unwrap();
4268 }
4269 let start_key = region.range.start.key;
4270 let start_value = region.range.start.value.unwrap();
4271 let buffer_start_key = region.buffer_range.start.key;
4272 let buffer_start_value = region.buffer_range.start.value.unwrap();
4273 let mut buffer_key = buffer_start_key;
4274 buffer_key += key - start_key;
4275 let buffer_value = convert_buffer_dimension(region.buffer, buffer_key);
4276 let mut result = start_value;
4277 result += buffer_value - buffer_start_value;
4278 result
4279 } else {
4280 self.max_position()
4281 }
4282 }
4283
4284 pub fn point_to_buffer_offset<T: ToOffset>(
4285 &self,
4286 point: T,
4287 ) -> Option<(&BufferSnapshot, BufferOffset)> {
4288 let offset = point.to_offset(self);
4289 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
4290 cursor.seek(&offset);
4291 let region = cursor.region()?;
4292 let overshoot = offset - region.range.start;
4293 let buffer_offset = region.buffer_range.start + overshoot;
4294 if buffer_offset == BufferOffset(region.buffer.len() + 1)
4295 && region.has_trailing_newline
4296 && !region.is_main_buffer
4297 {
4298 let main_buffer_position = cursor.main_buffer_position()?;
4299 let buffer_snapshot = &cursor.excerpt()?.buffer;
4300 return Some((buffer_snapshot, main_buffer_position));
4301 } else if buffer_offset > BufferOffset(region.buffer.len()) {
4302 return None;
4303 }
4304 Some((region.buffer, buffer_offset))
4305 }
4306
4307 pub fn point_to_buffer_point(
4308 &self,
4309 point: Point,
4310 ) -> Option<(&BufferSnapshot, Point, ExcerptId)> {
4311 let mut cursor = self.cursor::<Point, Point>();
4312 cursor.seek(&point);
4313 let region = cursor.region()?;
4314 let overshoot = point - region.range.start;
4315 let buffer_point = region.buffer_range.start + overshoot;
4316 let excerpt = cursor.excerpt()?;
4317 if buffer_point == region.buffer.max_point() + Point::new(1, 0)
4318 && region.has_trailing_newline
4319 && !region.is_main_buffer
4320 {
4321 return Some((&excerpt.buffer, cursor.main_buffer_position()?, excerpt.id));
4322 } else if buffer_point > region.buffer.max_point() {
4323 return None;
4324 }
4325 Some((region.buffer, buffer_point, excerpt.id))
4326 }
4327
4328 pub fn suggested_indents(
4329 &self,
4330 rows: impl IntoIterator<Item = u32>,
4331 cx: &App,
4332 ) -> BTreeMap<MultiBufferRow, IndentSize> {
4333 let mut result = BTreeMap::new();
4334
4335 let mut rows_for_excerpt = Vec::new();
4336 let mut cursor = self.cursor::<Point, Point>();
4337 let mut rows = rows.into_iter().peekable();
4338 let mut prev_row = u32::MAX;
4339 let mut prev_language_indent_size = IndentSize::default();
4340
4341 while let Some(row) = rows.next() {
4342 cursor.seek(&Point::new(row, 0));
4343 let Some(region) = cursor.region() else {
4344 continue;
4345 };
4346
4347 // Retrieve the language and indent size once for each disjoint region being indented.
4348 let single_indent_size = if row.saturating_sub(1) == prev_row {
4349 prev_language_indent_size
4350 } else {
4351 region
4352 .buffer
4353 .language_indent_size_at(Point::new(row, 0), cx)
4354 };
4355 prev_language_indent_size = single_indent_size;
4356 prev_row = row;
4357
4358 let start_buffer_row = region.buffer_range.start.row;
4359 let start_multibuffer_row = region.range.start.row;
4360 let end_multibuffer_row = region.range.end.row;
4361
4362 rows_for_excerpt.push(row);
4363 while let Some(next_row) = rows.peek().copied() {
4364 if end_multibuffer_row > next_row {
4365 rows_for_excerpt.push(next_row);
4366 rows.next();
4367 } else {
4368 break;
4369 }
4370 }
4371
4372 let buffer_rows = rows_for_excerpt
4373 .drain(..)
4374 .map(|row| start_buffer_row + row - start_multibuffer_row);
4375 let buffer_indents = region
4376 .buffer
4377 .suggested_indents(buffer_rows, single_indent_size);
4378 let multibuffer_indents = buffer_indents.into_iter().map(|(row, indent)| {
4379 (
4380 MultiBufferRow(start_multibuffer_row + row - start_buffer_row),
4381 indent,
4382 )
4383 });
4384 result.extend(multibuffer_indents);
4385 }
4386
4387 result
4388 }
4389
4390 pub fn indent_size_for_line(&self, row: MultiBufferRow) -> IndentSize {
4391 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4392 let mut size = buffer.indent_size_for_line(range.start.row);
4393 size.len = size
4394 .len
4395 .min(range.end.column)
4396 .saturating_sub(range.start.column);
4397 size
4398 } else {
4399 IndentSize::spaces(0)
4400 }
4401 }
4402
4403 pub fn line_indent_for_row(&self, row: MultiBufferRow) -> LineIndent {
4404 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
4405 LineIndent::from_iter(buffer.text_for_range(range).flat_map(|s| s.chars()))
4406 } else {
4407 LineIndent::spaces(0)
4408 }
4409 }
4410
4411 pub fn indent_and_comment_for_line(&self, row: MultiBufferRow, cx: &App) -> String {
4412 let mut indent = self.indent_size_for_line(row).chars().collect::<String>();
4413
4414 if self.language_settings(cx).extend_comment_on_newline
4415 && let Some(language_scope) = self.language_scope_at(Point::new(row.0, 0))
4416 {
4417 let delimiters = language_scope.line_comment_prefixes();
4418 for delimiter in delimiters {
4419 if *self
4420 .chars_at(Point::new(row.0, indent.len() as u32))
4421 .take(delimiter.chars().count())
4422 .collect::<String>()
4423 .as_str()
4424 == **delimiter
4425 {
4426 indent.push_str(delimiter);
4427 break;
4428 }
4429 }
4430 }
4431
4432 indent
4433 }
4434
4435 pub fn is_line_whitespace_upto<T>(&self, position: T) -> bool
4436 where
4437 T: ToOffset,
4438 {
4439 for char in self.reversed_chars_at(position) {
4440 if !char.is_whitespace() {
4441 return false;
4442 }
4443 if char == '\n' {
4444 return true;
4445 }
4446 }
4447 true
4448 }
4449
4450 pub fn prev_non_blank_row(&self, mut row: MultiBufferRow) -> Option<MultiBufferRow> {
4451 while row.0 > 0 {
4452 row.0 -= 1;
4453 if !self.is_line_blank(row) {
4454 return Some(row);
4455 }
4456 }
4457 None
4458 }
4459
4460 pub fn line_len(&self, row: MultiBufferRow) -> u32 {
4461 if let Some((_, range)) = self.buffer_line_for_row(row) {
4462 range.end.column - range.start.column
4463 } else {
4464 0
4465 }
4466 }
4467
4468 pub fn buffer_line_for_row(
4469 &self,
4470 row: MultiBufferRow,
4471 ) -> Option<(&BufferSnapshot, Range<Point>)> {
4472 let mut cursor = self.cursor::<Point, Point>();
4473 let point = Point::new(row.0, 0);
4474 cursor.seek(&point);
4475 let region = cursor.region()?;
4476 let overshoot = point.min(region.range.end) - region.range.start;
4477 let buffer_point = region.buffer_range.start + overshoot;
4478 if buffer_point.row > region.buffer_range.end.row {
4479 return None;
4480 }
4481 let line_start = Point::new(buffer_point.row, 0).max(region.buffer_range.start);
4482 let line_end = Point::new(buffer_point.row, region.buffer.line_len(buffer_point.row))
4483 .min(region.buffer_range.end);
4484 Some((region.buffer, line_start..line_end))
4485 }
4486
4487 pub fn max_point(&self) -> Point {
4488 self.text_summary().lines
4489 }
4490
4491 pub fn max_row(&self) -> MultiBufferRow {
4492 MultiBufferRow(self.text_summary().lines.row)
4493 }
4494
4495 pub fn text_summary(&self) -> MBTextSummary {
4496 self.diff_transforms.summary().output
4497 }
4498
4499 pub fn text_summary_for_range<MBD, O>(&self, range: Range<O>) -> MBD
4500 where
4501 MBD: MultiBufferDimension + AddAssign,
4502 O: ToOffset,
4503 {
4504 let range = range.start.to_offset(self)..range.end.to_offset(self);
4505 let mut cursor = self
4506 .diff_transforms
4507 .cursor::<Dimensions<MultiBufferOffset, ExcerptOffset>>(());
4508 cursor.seek(&range.start, Bias::Right);
4509
4510 let Some(first_transform) = cursor.item() else {
4511 return MBD::from_summary(&MBTextSummary::default());
4512 };
4513
4514 let diff_transform_start = cursor.start().0;
4515 let diff_transform_end = cursor.end().0;
4516 let diff_start = range.start;
4517 let start_overshoot = diff_start - diff_transform_start;
4518 let end_overshoot = std::cmp::min(range.end, diff_transform_end) - diff_transform_start;
4519
4520 let mut result = match first_transform {
4521 DiffTransform::BufferContent { .. } => {
4522 let excerpt_start = cursor.start().1 + start_overshoot;
4523 let excerpt_end = cursor.start().1 + end_overshoot;
4524 self.text_summary_for_excerpt_offset_range(excerpt_start..excerpt_end)
4525 }
4526 DiffTransform::DeletedHunk {
4527 buffer_id,
4528 base_text_byte_range,
4529 has_trailing_newline,
4530 ..
4531 } => {
4532 let buffer_start = base_text_byte_range.start + start_overshoot;
4533 let mut buffer_end = base_text_byte_range.start + end_overshoot;
4534 let Some(base_text) = self.diffs.get(buffer_id).map(|diff| diff.base_text()) else {
4535 panic!("{:?} is in non-existent deleted hunk", range.start)
4536 };
4537
4538 let include_trailing_newline =
4539 *has_trailing_newline && range.end >= diff_transform_end;
4540 if include_trailing_newline {
4541 buffer_end -= 1;
4542 }
4543
4544 let mut summary = base_text
4545 .text_summary_for_range::<MBD::TextDimension, _>(buffer_start..buffer_end);
4546
4547 if include_trailing_newline {
4548 summary.add_assign(&<MBD::TextDimension>::from_text_summary(
4549 &TextSummary::newline(),
4550 ))
4551 }
4552
4553 let mut result = MBD::default();
4554 result.add_text_dim(&summary);
4555 result
4556 }
4557 };
4558 if range.end < diff_transform_end {
4559 return result;
4560 }
4561
4562 cursor.next();
4563 result.add_mb_text_summary(
4564 &cursor
4565 .summary::<_, OutputDimension<_>>(&range.end, Bias::Right)
4566 .0,
4567 );
4568
4569 let Some(last_transform) = cursor.item() else {
4570 return result;
4571 };
4572
4573 let overshoot = range.end - cursor.start().0;
4574 let suffix = match last_transform {
4575 DiffTransform::BufferContent { .. } => {
4576 let end = cursor.start().1 + overshoot;
4577 self.text_summary_for_excerpt_offset_range::<MBD>(cursor.start().1..end)
4578 }
4579 DiffTransform::DeletedHunk {
4580 base_text_byte_range,
4581 buffer_id,
4582 has_trailing_newline,
4583 ..
4584 } => {
4585 let buffer_end = base_text_byte_range.start + overshoot;
4586 let Some(base_text) = self.diffs.get(buffer_id).map(|diff| diff.base_text()) else {
4587 panic!("{:?} is in non-existent deleted hunk", range.end)
4588 };
4589
4590 let mut suffix = base_text.text_summary_for_range::<MBD::TextDimension, _>(
4591 base_text_byte_range.start..buffer_end,
4592 );
4593 if *has_trailing_newline && buffer_end == base_text_byte_range.end + 1 {
4594 suffix.add_assign(&<MBD::TextDimension>::from_text_summary(
4595 &TextSummary::from("\n"),
4596 ))
4597 }
4598
4599 let mut result = MBD::default();
4600 result.add_text_dim(&suffix);
4601 result
4602 }
4603 };
4604
4605 result += suffix;
4606 result
4607 }
4608
4609 fn text_summary_for_excerpt_offset_range<MBD>(&self, mut range: Range<ExcerptOffset>) -> MBD
4610 where
4611 MBD: MultiBufferDimension + AddAssign,
4612 {
4613 let mut summary = MBD::default();
4614 let mut cursor = self.excerpts.cursor::<ExcerptOffset>(());
4615 cursor.seek(&range.start, Bias::Right);
4616 if let Some(excerpt) = cursor.item() {
4617 let mut end_before_newline = cursor.end();
4618 if excerpt.has_trailing_newline {
4619 end_before_newline -= 1;
4620 }
4621
4622 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
4623 let start_in_excerpt = excerpt_start + (range.start - *cursor.start());
4624 let end_in_excerpt =
4625 excerpt_start + (cmp::min(end_before_newline, range.end) - *cursor.start());
4626 summary.add_text_dim(
4627 &excerpt
4628 .buffer
4629 .text_summary_for_range::<MBD::TextDimension, _>(
4630 start_in_excerpt..end_in_excerpt,
4631 ),
4632 );
4633
4634 if range.end > end_before_newline {
4635 summary.add_mb_text_summary(&MBTextSummary::from(TextSummary::newline()));
4636 }
4637
4638 cursor.next();
4639 }
4640
4641 if range.end > *cursor.start() {
4642 summary += cursor
4643 .summary::<_, ExcerptDimension<MBD>>(&range.end, Bias::Right)
4644 .0;
4645 if let Some(excerpt) = cursor.item() {
4646 range.end = cmp::max(*cursor.start(), range.end);
4647
4648 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
4649 let end_in_excerpt = excerpt_start + (range.end - *cursor.start());
4650 summary.add_text_dim(
4651 &excerpt
4652 .buffer
4653 .text_summary_for_range::<MBD::TextDimension, _>(
4654 excerpt_start..end_in_excerpt,
4655 ),
4656 );
4657 }
4658 }
4659
4660 summary
4661 }
4662
4663 pub fn summary_for_anchor<MBD>(&self, anchor: &Anchor) -> MBD
4664 where
4665 MBD: MultiBufferDimension
4666 + Ord
4667 + Sub<Output = MBD::TextDimension>
4668 + AddAssign<MBD::TextDimension>,
4669 MBD::TextDimension: Sub<Output = MBD::TextDimension> + Ord,
4670 {
4671 self.summaries_for_anchors([anchor])[0]
4672 }
4673
4674 fn resolve_summary_for_anchor<MBD>(
4675 &self,
4676 anchor: &Anchor,
4677 excerpt_position: ExcerptDimension<MBD>,
4678 diff_transforms: &mut Cursor<
4679 DiffTransform,
4680 Dimensions<ExcerptDimension<MBD>, OutputDimension<MBD>>,
4681 >,
4682 ) -> MBD
4683 where
4684 MBD: MultiBufferDimension + Ord + Sub + AddAssign<<MBD as Sub>::Output>,
4685 {
4686 loop {
4687 let transform_end_position = diff_transforms.end().0;
4688 let at_transform_end =
4689 transform_end_position == excerpt_position && diff_transforms.item().is_some();
4690 if at_transform_end && anchor.text_anchor.bias == Bias::Right {
4691 diff_transforms.next();
4692 continue;
4693 }
4694
4695 let mut position = diff_transforms.start().1;
4696 match diff_transforms.item() {
4697 Some(DiffTransform::DeletedHunk {
4698 buffer_id,
4699 base_text_byte_range,
4700 ..
4701 }) => {
4702 if let Some(diff_base_anchor) = &anchor.diff_base_anchor
4703 && let Some(base_text) =
4704 self.diffs.get(buffer_id).map(|diff| diff.base_text())
4705 && base_text.can_resolve(diff_base_anchor)
4706 {
4707 let base_text_offset = diff_base_anchor.to_offset(base_text);
4708 if base_text_offset >= base_text_byte_range.start
4709 && base_text_offset <= base_text_byte_range.end
4710 {
4711 let position_in_hunk = base_text
4712 .text_summary_for_range::<MBD::TextDimension, _>(
4713 base_text_byte_range.start..base_text_offset,
4714 );
4715 position.0.add_text_dim(&position_in_hunk);
4716 } else if at_transform_end {
4717 diff_transforms.next();
4718 continue;
4719 }
4720 }
4721 }
4722 _ => {
4723 if at_transform_end && anchor.diff_base_anchor.is_some() {
4724 diff_transforms.next();
4725 continue;
4726 }
4727 let overshoot = excerpt_position - diff_transforms.start().0;
4728 position += overshoot;
4729 }
4730 }
4731
4732 return position.0;
4733 }
4734 }
4735
4736 fn excerpt_offset_for_anchor(&self, anchor: &Anchor) -> ExcerptOffset {
4737 let mut cursor = self
4738 .excerpts
4739 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
4740 let locator = self.excerpt_locator_for_id(anchor.excerpt_id);
4741
4742 cursor.seek(&Some(locator), Bias::Left);
4743 if cursor.item().is_none() && anchor.excerpt_id == ExcerptId::max() {
4744 cursor.prev();
4745 }
4746
4747 let mut position = cursor.start().1;
4748 if let Some(excerpt) = cursor.item()
4749 && (excerpt.id == anchor.excerpt_id || anchor.excerpt_id == ExcerptId::max())
4750 {
4751 let excerpt_buffer_start = excerpt
4752 .buffer
4753 .offset_for_anchor(&excerpt.range.context.start);
4754 let excerpt_buffer_end = excerpt.buffer.offset_for_anchor(&excerpt.range.context.end);
4755 let buffer_position = cmp::min(
4756 excerpt_buffer_end,
4757 excerpt.buffer.offset_for_anchor(&anchor.text_anchor),
4758 );
4759 if buffer_position > excerpt_buffer_start {
4760 position += buffer_position - excerpt_buffer_start;
4761 }
4762 }
4763 position
4764 }
4765
4766 pub fn latest_excerpt_id(&self, mut excerpt_id: ExcerptId) -> ExcerptId {
4767 while let Some(replacement) = self.replaced_excerpts.get(&excerpt_id) {
4768 excerpt_id = *replacement;
4769 }
4770 excerpt_id
4771 }
4772
4773 pub fn summaries_for_anchors<'a, MBD, I>(&'a self, anchors: I) -> Vec<MBD>
4774 where
4775 MBD: MultiBufferDimension
4776 + Ord
4777 + Sub<Output = MBD::TextDimension>
4778 + AddAssign<MBD::TextDimension>,
4779 MBD::TextDimension: Sub<Output = MBD::TextDimension> + Ord,
4780 I: 'a + IntoIterator<Item = &'a Anchor>,
4781 {
4782 let mut anchors = anchors.into_iter().peekable();
4783 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
4784 let mut diff_transforms_cursor = self
4785 .diff_transforms
4786 .cursor::<Dimensions<ExcerptDimension<MBD>, OutputDimension<MBD>>>(());
4787 diff_transforms_cursor.next();
4788
4789 let mut summaries = Vec::new();
4790 while let Some(anchor) = anchors.peek() {
4791 let excerpt_id = self.latest_excerpt_id(anchor.excerpt_id);
4792
4793 let excerpt_anchors = anchors.peeking_take_while(|anchor| {
4794 self.latest_excerpt_id(anchor.excerpt_id) == excerpt_id
4795 });
4796
4797 let locator = self.excerpt_locator_for_id(excerpt_id);
4798 cursor.seek_forward(locator, Bias::Left);
4799 if cursor.item().is_none() && excerpt_id == ExcerptId::max() {
4800 cursor.prev();
4801 }
4802
4803 let excerpt_start_position = ExcerptDimension(MBD::from_summary(&cursor.start().text));
4804 if let Some(excerpt) = cursor.item() {
4805 if excerpt.id != excerpt_id && excerpt_id != ExcerptId::max() {
4806 let position = self.resolve_summary_for_anchor(
4807 &Anchor::min(),
4808 excerpt_start_position,
4809 &mut diff_transforms_cursor,
4810 );
4811 summaries.extend(excerpt_anchors.map(|_| position));
4812 continue;
4813 }
4814 let excerpt_buffer_start = excerpt
4815 .range
4816 .context
4817 .start
4818 .summary::<MBD::TextDimension>(&excerpt.buffer);
4819 let excerpt_buffer_end = excerpt
4820 .range
4821 .context
4822 .end
4823 .summary::<MBD::TextDimension>(&excerpt.buffer);
4824 for (buffer_summary, anchor) in excerpt
4825 .buffer
4826 .summaries_for_anchors_with_payload::<MBD::TextDimension, _, _>(
4827 excerpt_anchors.map(|a| (&a.text_anchor, a)),
4828 )
4829 {
4830 let summary = cmp::min(excerpt_buffer_end, buffer_summary);
4831 let mut position = excerpt_start_position;
4832 if summary > excerpt_buffer_start {
4833 position += summary - excerpt_buffer_start;
4834 }
4835
4836 if diff_transforms_cursor.start().0 < position {
4837 diff_transforms_cursor.seek_forward(&position, Bias::Left);
4838 }
4839
4840 summaries.push(self.resolve_summary_for_anchor(
4841 anchor,
4842 position,
4843 &mut diff_transforms_cursor,
4844 ));
4845 }
4846 } else {
4847 diff_transforms_cursor.seek_forward(&excerpt_start_position, Bias::Left);
4848 let position = self.resolve_summary_for_anchor(
4849 &Anchor::max(),
4850 excerpt_start_position,
4851 &mut diff_transforms_cursor,
4852 );
4853 summaries.extend(excerpt_anchors.map(|_| position));
4854 }
4855 }
4856
4857 summaries
4858 }
4859
4860 pub fn dimensions_from_points<'a, MBD>(
4861 &'a self,
4862 points: impl 'a + IntoIterator<Item = Point>,
4863 ) -> impl 'a + Iterator<Item = MBD>
4864 where
4865 MBD: MultiBufferDimension + Sub + AddAssign<<MBD as Sub>::Output>,
4866 {
4867 let mut cursor = self.cursor::<DimensionPair<Point, MBD>, Point>();
4868 cursor.seek(&DimensionPair {
4869 key: Point::default(),
4870 value: None,
4871 });
4872 let mut points = points.into_iter();
4873 iter::from_fn(move || {
4874 let point = points.next()?;
4875
4876 cursor.seek_forward(&DimensionPair {
4877 key: point,
4878 value: None,
4879 });
4880
4881 if let Some(region) = cursor.region() {
4882 let overshoot = point - region.range.start.key;
4883 let buffer_point = region.buffer_range.start + overshoot;
4884 let mut position = region.range.start.value.unwrap();
4885 position.add_text_dim(
4886 ®ion
4887 .buffer
4888 .text_summary_for_range(region.buffer_range.start..buffer_point),
4889 );
4890 if point == region.range.end.key && region.has_trailing_newline {
4891 position.add_mb_text_summary(&MBTextSummary::from(TextSummary::newline()));
4892 }
4893 Some(position)
4894 } else {
4895 Some(MBD::from_summary(&self.text_summary()))
4896 }
4897 })
4898 }
4899
4900 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
4901 where
4902 I: 'a + IntoIterator<Item = &'a Anchor>,
4903 {
4904 let mut anchors = anchors.into_iter().enumerate().peekable();
4905 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(());
4906 cursor.next();
4907
4908 let mut result = Vec::new();
4909
4910 while let Some((_, anchor)) = anchors.peek() {
4911 let old_excerpt_id = anchor.excerpt_id;
4912
4913 // Find the location where this anchor's excerpt should be.
4914 let old_locator = self.excerpt_locator_for_id(old_excerpt_id);
4915 cursor.seek_forward(&Some(old_locator), Bias::Left);
4916
4917 let next_excerpt = cursor.item();
4918 let prev_excerpt = cursor.prev_item();
4919
4920 // Process all of the anchors for this excerpt.
4921 while let Some((anchor_ix, &anchor)) =
4922 anchors.next_if(|(_, anchor)| anchor.excerpt_id == old_excerpt_id)
4923 {
4924 let mut anchor = anchor;
4925
4926 // Leave min and max anchors unchanged if invalid or
4927 // if the old excerpt still exists at this location
4928 let mut kept_position = next_excerpt
4929 .is_some_and(|e| e.id == old_excerpt_id && e.contains(&anchor))
4930 || old_excerpt_id == ExcerptId::max()
4931 || old_excerpt_id == ExcerptId::min();
4932
4933 // If the old excerpt no longer exists at this location, then attempt to
4934 // find an equivalent position for this anchor in an adjacent excerpt.
4935 if !kept_position {
4936 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
4937 if excerpt.contains(&anchor) {
4938 anchor.excerpt_id = excerpt.id;
4939 kept_position = true;
4940 break;
4941 }
4942 }
4943 }
4944
4945 // If there's no adjacent excerpt that contains the anchor's position,
4946 // then report that the anchor has lost its position.
4947 if !kept_position {
4948 anchor = if let Some(excerpt) = next_excerpt {
4949 let mut text_anchor = excerpt
4950 .range
4951 .context
4952 .start
4953 .bias(anchor.text_anchor.bias, &excerpt.buffer);
4954 if text_anchor
4955 .cmp(&excerpt.range.context.end, &excerpt.buffer)
4956 .is_gt()
4957 {
4958 text_anchor = excerpt.range.context.end;
4959 }
4960 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, text_anchor)
4961 } else if let Some(excerpt) = prev_excerpt {
4962 let mut text_anchor = excerpt
4963 .range
4964 .context
4965 .end
4966 .bias(anchor.text_anchor.bias, &excerpt.buffer);
4967 if text_anchor
4968 .cmp(&excerpt.range.context.start, &excerpt.buffer)
4969 .is_lt()
4970 {
4971 text_anchor = excerpt.range.context.start;
4972 }
4973 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, text_anchor)
4974 } else if anchor.text_anchor.bias == Bias::Left {
4975 Anchor::min()
4976 } else {
4977 Anchor::max()
4978 };
4979 }
4980
4981 result.push((anchor_ix, anchor, kept_position));
4982 }
4983 }
4984 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self));
4985 result
4986 }
4987
4988 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
4989 self.anchor_at(position, Bias::Left)
4990 }
4991
4992 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
4993 self.anchor_at(position, Bias::Right)
4994 }
4995
4996 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
4997 let offset = position.to_offset(self);
4998
4999 // Find the given position in the diff transforms. Determine the corresponding
5000 // offset in the excerpts, and whether the position is within a deleted hunk.
5001 let mut diff_transforms = self
5002 .diff_transforms
5003 .cursor::<Dimensions<MultiBufferOffset, ExcerptOffset>>(());
5004 diff_transforms.seek(&offset, Bias::Right);
5005
5006 if offset == diff_transforms.start().0
5007 && bias == Bias::Left
5008 && let Some(prev_item) = diff_transforms.prev_item()
5009 && let DiffTransform::DeletedHunk { .. } = prev_item
5010 {
5011 diff_transforms.prev();
5012 }
5013 let offset_in_transform = offset - diff_transforms.start().0;
5014 let mut excerpt_offset = diff_transforms.start().1;
5015 let mut diff_base_anchor = None;
5016 if let Some(DiffTransform::DeletedHunk {
5017 buffer_id,
5018 base_text_byte_range,
5019 has_trailing_newline,
5020 ..
5021 }) = diff_transforms.item()
5022 {
5023 let diff = self.diffs.get(buffer_id).expect("missing diff");
5024 if offset_in_transform > base_text_byte_range.len() {
5025 debug_assert!(*has_trailing_newline);
5026 bias = Bias::Right;
5027 } else {
5028 diff_base_anchor = Some(
5029 diff.base_text()
5030 .anchor_at(base_text_byte_range.start + offset_in_transform, bias),
5031 );
5032 bias = Bias::Left;
5033 }
5034 } else {
5035 excerpt_offset += MultiBufferOffset(offset_in_transform);
5036 };
5037
5038 let mut excerpts = self
5039 .excerpts
5040 .cursor::<Dimensions<ExcerptOffset, Option<ExcerptId>>>(());
5041 excerpts.seek(&excerpt_offset, Bias::Right);
5042 if excerpts.item().is_none() && excerpt_offset == excerpts.start().0 && bias == Bias::Left {
5043 excerpts.prev();
5044 }
5045 if let Some(excerpt) = excerpts.item() {
5046 let mut overshoot = excerpt_offset.saturating_sub(excerpts.start().0);
5047 if excerpt.has_trailing_newline && excerpt_offset == excerpts.end().0 {
5048 overshoot -= 1;
5049 bias = Bias::Right;
5050 }
5051
5052 let buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
5053 let text_anchor =
5054 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
5055 let anchor = Anchor::in_buffer(excerpt.id, excerpt.buffer_id, text_anchor);
5056 match diff_base_anchor {
5057 Some(diff_base_anchor) => anchor.with_diff_base_anchor(diff_base_anchor),
5058 None => anchor,
5059 }
5060 } else if excerpt_offset == ExcerptDimension(MultiBufferOffset::ZERO) && bias == Bias::Left
5061 {
5062 Anchor::min()
5063 } else {
5064 Anchor::max()
5065 }
5066 }
5067
5068 /// Wraps the [`text::Anchor`] in a [`multi_buffer::Anchor`] if this multi-buffer is a singleton.
5069 pub fn as_singleton_anchor(&self, text_anchor: text::Anchor) -> Option<Anchor> {
5070 let (excerpt, buffer, _) = self.as_singleton()?;
5071 Some(Anchor::in_buffer(*excerpt, buffer, text_anchor))
5072 }
5073
5074 /// Returns an anchor for the given excerpt and text anchor,
5075 /// Returns [`None`] if the excerpt_id is no longer valid or the text anchor range is out of excerpt's bounds.
5076 pub fn anchor_range_in_excerpt(
5077 &self,
5078 excerpt_id: ExcerptId,
5079 text_anchor: Range<text::Anchor>,
5080 ) -> Option<Range<Anchor>> {
5081 let excerpt_id = self.latest_excerpt_id(excerpt_id);
5082 let excerpt = self.excerpt(excerpt_id)?;
5083
5084 Some(
5085 self.anchor_in_excerpt_(excerpt, text_anchor.start)?
5086 ..self.anchor_in_excerpt_(excerpt, text_anchor.end)?,
5087 )
5088 }
5089
5090 /// Returns an anchor for the given excerpt and text anchor,
5091 /// Returns [`None`] if the excerpt_id is no longer valid or the text anchor range is out of excerpt's bounds.
5092 pub fn anchor_in_excerpt(
5093 &self,
5094 excerpt_id: ExcerptId,
5095 text_anchor: text::Anchor,
5096 ) -> Option<Anchor> {
5097 let excerpt_id = self.latest_excerpt_id(excerpt_id);
5098 let excerpt = self.excerpt(excerpt_id)?;
5099 self.anchor_in_excerpt_(excerpt, text_anchor)
5100 }
5101
5102 fn anchor_in_excerpt_(&self, excerpt: &Excerpt, text_anchor: text::Anchor) -> Option<Anchor> {
5103 match text_anchor.buffer_id {
5104 Some(buffer_id) if buffer_id == excerpt.buffer_id => (),
5105 Some(_) => return None,
5106 None if text_anchor == text::Anchor::MAX || text_anchor == text::Anchor::MIN => {
5107 return Some(Anchor::in_buffer(
5108 excerpt.id,
5109 excerpt.buffer_id,
5110 text_anchor,
5111 ));
5112 }
5113 None => return None,
5114 }
5115
5116 let context = &excerpt.range.context;
5117 if context.start.cmp(&text_anchor, &excerpt.buffer).is_gt()
5118 || context.end.cmp(&text_anchor, &excerpt.buffer).is_lt()
5119 {
5120 return None;
5121 }
5122
5123 Some(Anchor::in_buffer(
5124 excerpt.id,
5125 excerpt.buffer_id,
5126 text_anchor,
5127 ))
5128 }
5129
5130 pub fn context_range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<text::Anchor>> {
5131 Some(self.excerpt(excerpt_id)?.range.context.clone())
5132 }
5133
5134 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
5135 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
5136 true
5137 } else if let Some(excerpt) = self.excerpt(anchor.excerpt_id) {
5138 excerpt.buffer.can_resolve(&anchor.text_anchor)
5139 } else {
5140 false
5141 }
5142 }
5143
5144 pub fn excerpts(
5145 &self,
5146 ) -> impl Iterator<Item = (ExcerptId, &BufferSnapshot, ExcerptRange<text::Anchor>)> {
5147 self.excerpts
5148 .iter()
5149 .map(|excerpt| (excerpt.id, &excerpt.buffer, excerpt.range.clone()))
5150 }
5151
5152 fn cursor<'a, MBD, BD>(&'a self) -> MultiBufferCursor<'a, MBD, BD>
5153 where
5154 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
5155 BD: TextDimension + AddAssign<<MBD as Sub>::Output>,
5156 {
5157 let excerpts = self.excerpts.cursor(());
5158 let diff_transforms = self.diff_transforms.cursor(());
5159 MultiBufferCursor {
5160 excerpts,
5161 diff_transforms,
5162 diffs: &self.diffs,
5163 cached_region: None,
5164 }
5165 }
5166
5167 pub fn excerpt_before(&self, excerpt_id: ExcerptId) -> Option<MultiBufferExcerpt<'_>> {
5168 let start_locator = self.excerpt_locator_for_id(excerpt_id);
5169 let mut excerpts = self
5170 .excerpts
5171 .cursor::<Dimensions<Option<&Locator>, ExcerptOffset>>(());
5172 excerpts.seek(&Some(start_locator), Bias::Left);
5173 excerpts.prev();
5174
5175 let mut diff_transforms = self
5176 .diff_transforms
5177 .cursor::<DiffTransforms<MultiBufferOffset>>(());
5178 diff_transforms.seek(&excerpts.start().1, Bias::Left);
5179 if diff_transforms.end().excerpt_dimension < excerpts.start().1 {
5180 diff_transforms.next();
5181 }
5182
5183 let excerpt = excerpts.item()?;
5184 Some(MultiBufferExcerpt {
5185 excerpt,
5186 offset: diff_transforms.start().output_dimension.0,
5187 buffer_offset: BufferOffset(excerpt.range.context.start.to_offset(&excerpt.buffer)),
5188 excerpt_offset: excerpts.start().1,
5189 diff_transforms,
5190 })
5191 }
5192
5193 pub fn excerpt_boundaries_in_range<R, T>(
5194 &self,
5195 range: R,
5196 ) -> impl Iterator<Item = ExcerptBoundary> + '_
5197 where
5198 R: RangeBounds<T>,
5199 T: ToOffset,
5200 {
5201 let start_offset;
5202 let start = match range.start_bound() {
5203 Bound::Included(start) => {
5204 start_offset = start.to_offset(self);
5205 Bound::Included(start_offset)
5206 }
5207 Bound::Excluded(_) => {
5208 panic!("not supported")
5209 }
5210 Bound::Unbounded => {
5211 start_offset = MultiBufferOffset::ZERO;
5212 Bound::Unbounded
5213 }
5214 };
5215 let end = match range.end_bound() {
5216 Bound::Included(end) => Bound::Included(end.to_offset(self)),
5217 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
5218 Bound::Unbounded => Bound::Unbounded,
5219 };
5220 let bounds = (start, end);
5221 let mut cursor = self.cursor::<DimensionPair<MultiBufferOffset, Point>, BufferOffset>();
5222 cursor.seek(&DimensionPair {
5223 key: start_offset,
5224 value: None,
5225 });
5226
5227 if cursor
5228 .region()
5229 .is_some_and(|region| bounds.contains(®ion.range.start.key))
5230 {
5231 cursor.prev_excerpt();
5232 } else {
5233 cursor.seek_to_start_of_current_excerpt();
5234 }
5235 let mut prev_region = cursor.region();
5236
5237 cursor.next_excerpt();
5238
5239 iter::from_fn(move || {
5240 loop {
5241 if self.singleton {
5242 return None;
5243 }
5244
5245 let next_region = cursor.region()?;
5246 cursor.next_excerpt();
5247 if !bounds.contains(&next_region.range.start.key) {
5248 prev_region = Some(next_region);
5249 continue;
5250 }
5251
5252 let next_region_start = next_region.range.start.value.unwrap();
5253 let next_region_end = if let Some(region) = cursor.region() {
5254 region.range.start.value.unwrap()
5255 } else {
5256 self.max_point()
5257 };
5258
5259 let prev = prev_region.as_ref().map(|region| ExcerptInfo {
5260 id: region.excerpt.id,
5261 buffer: region.excerpt.buffer.clone(),
5262 buffer_id: region.excerpt.buffer_id,
5263 range: region.excerpt.range.clone(),
5264 end_row: MultiBufferRow(next_region_start.row),
5265 });
5266
5267 let next = ExcerptInfo {
5268 id: next_region.excerpt.id,
5269 buffer: next_region.excerpt.buffer.clone(),
5270 buffer_id: next_region.excerpt.buffer_id,
5271 range: next_region.excerpt.range.clone(),
5272 end_row: if next_region.excerpt.has_trailing_newline {
5273 MultiBufferRow(next_region_end.row - 1)
5274 } else {
5275 MultiBufferRow(next_region_end.row)
5276 },
5277 };
5278
5279 let row = MultiBufferRow(next_region_start.row);
5280
5281 prev_region = Some(next_region);
5282
5283 return Some(ExcerptBoundary { row, prev, next });
5284 }
5285 })
5286 }
5287
5288 pub fn edit_count(&self) -> usize {
5289 self.edit_count
5290 }
5291
5292 pub fn non_text_state_update_count(&self) -> usize {
5293 self.non_text_state_update_count
5294 }
5295
5296 /// Returns the smallest enclosing bracket ranges containing the given range or
5297 /// None if no brackets contain range or the range is not contained in a single
5298 /// excerpt
5299 ///
5300 /// Can optionally pass a range_filter to filter the ranges of brackets to consider
5301 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
5302 &self,
5303 range: Range<T>,
5304 range_filter: Option<
5305 &dyn Fn(&BufferSnapshot, Range<BufferOffset>, Range<BufferOffset>) -> bool,
5306 >,
5307 ) -> Option<(Range<MultiBufferOffset>, Range<MultiBufferOffset>)> {
5308 let range = range.start.to_offset(self)..range.end.to_offset(self);
5309 let mut excerpt = self.excerpt_containing(range.clone())?;
5310 let buffer = excerpt.buffer();
5311 let excerpt_buffer_range = excerpt.buffer_range();
5312
5313 // Filter to ranges contained in the excerpt
5314 let range_filter = |open: Range<usize>, close: Range<usize>| -> bool {
5315 excerpt_buffer_range.contains(&BufferOffset(open.start))
5316 && excerpt_buffer_range.contains(&BufferOffset(close.end))
5317 && range_filter.is_none_or(|filter| {
5318 filter(
5319 buffer,
5320 BufferOffset(open.start)..BufferOffset(close.end),
5321 BufferOffset(close.start)..BufferOffset(close.end),
5322 )
5323 })
5324 };
5325
5326 let (open, close) = excerpt.buffer().innermost_enclosing_bracket_ranges(
5327 excerpt.map_range_to_buffer(range),
5328 Some(&range_filter),
5329 )?;
5330
5331 Some((
5332 excerpt.map_range_from_buffer(BufferOffset(open.start)..BufferOffset(open.end)),
5333 excerpt.map_range_from_buffer(BufferOffset(close.start)..BufferOffset(close.end)),
5334 ))
5335 }
5336
5337 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5338 /// not contained in a single excerpt
5339 pub fn enclosing_bracket_ranges<T: ToOffset>(
5340 &self,
5341 range: Range<T>,
5342 ) -> Option<impl Iterator<Item = (Range<MultiBufferOffset>, Range<MultiBufferOffset>)> + '_>
5343 {
5344 let range = range.start.to_offset(self)..range.end.to_offset(self);
5345 let mut excerpt = self.excerpt_containing(range.clone())?;
5346
5347 Some(
5348 excerpt
5349 .buffer()
5350 .enclosing_bracket_ranges(excerpt.map_range_to_buffer(range))
5351 .filter_map(move |pair| {
5352 let open_range =
5353 BufferOffset(pair.open_range.start)..BufferOffset(pair.open_range.end);
5354 let close_range =
5355 BufferOffset(pair.close_range.start)..BufferOffset(pair.close_range.end);
5356 if excerpt.contains_buffer_range(open_range.start..close_range.end) {
5357 Some((
5358 excerpt.map_range_from_buffer(open_range),
5359 excerpt.map_range_from_buffer(close_range),
5360 ))
5361 } else {
5362 None
5363 }
5364 }),
5365 )
5366 }
5367
5368 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
5369 /// not contained in a single excerpt
5370 pub fn text_object_ranges<T: ToOffset>(
5371 &self,
5372 range: Range<T>,
5373 options: TreeSitterOptions,
5374 ) -> impl Iterator<Item = (Range<MultiBufferOffset>, TextObject)> + '_ {
5375 let range = range.start.to_offset(self)..range.end.to_offset(self);
5376 self.excerpt_containing(range.clone())
5377 .map(|mut excerpt| {
5378 excerpt
5379 .buffer()
5380 .text_object_ranges(excerpt.map_range_to_buffer(range), options)
5381 .filter_map(move |(range, text_object)| {
5382 let range = BufferOffset(range.start)..BufferOffset(range.end);
5383 if excerpt.contains_buffer_range(range.clone()) {
5384 Some((excerpt.map_range_from_buffer(range), text_object))
5385 } else {
5386 None
5387 }
5388 })
5389 })
5390 .into_iter()
5391 .flatten()
5392 }
5393
5394 /// Returns bracket range pairs overlapping the given `range` or returns None if the `range` is
5395 /// not contained in a single excerpt
5396 pub fn bracket_ranges<T: ToOffset>(
5397 &self,
5398 range: Range<T>,
5399 ) -> Option<impl Iterator<Item = (Range<MultiBufferOffset>, Range<MultiBufferOffset>)> + '_>
5400 {
5401 let range = range.start.to_offset(self)..range.end.to_offset(self);
5402 let mut excerpt = self.excerpt_containing(range.clone())?;
5403
5404 Some(
5405 excerpt
5406 .buffer()
5407 .bracket_ranges(excerpt.map_range_to_buffer(range))
5408 .filter_map(move |pair| {
5409 let open_range =
5410 BufferOffset(pair.open_range.start)..BufferOffset(pair.open_range.end);
5411 let close_range =
5412 BufferOffset(pair.close_range.start)..BufferOffset(pair.close_range.end);
5413 if excerpt.contains_buffer_range(open_range.start..close_range.end) {
5414 Some((
5415 excerpt.map_range_from_buffer(open_range),
5416 excerpt.map_range_from_buffer(close_range),
5417 ))
5418 } else {
5419 None
5420 }
5421 }),
5422 )
5423 }
5424
5425 pub fn redacted_ranges<'a, T: ToOffset>(
5426 &'a self,
5427 range: Range<T>,
5428 redaction_enabled: impl Fn(Option<&Arc<dyn File>>) -> bool + 'a,
5429 ) -> impl Iterator<Item = Range<MultiBufferOffset>> + 'a {
5430 let range = range.start.to_offset(self)..range.end.to_offset(self);
5431 self.lift_buffer_metadata(range, move |buffer, range| {
5432 if redaction_enabled(buffer.file()) {
5433 Some(buffer.redacted_ranges(range).map(|range| (range, ())))
5434 } else {
5435 None
5436 }
5437 })
5438 .map(|(range, _, _)| range)
5439 }
5440
5441 pub fn runnable_ranges(
5442 &self,
5443 range: Range<Anchor>,
5444 ) -> impl Iterator<Item = (Range<MultiBufferOffset>, language::RunnableRange)> + '_ {
5445 let range = range.start.to_offset(self)..range.end.to_offset(self);
5446 self.lift_buffer_metadata(range, move |buffer, range| {
5447 Some(
5448 buffer
5449 .runnable_ranges(range.clone())
5450 .filter(move |runnable| {
5451 runnable.run_range.start >= range.start
5452 && runnable.run_range.end < range.end
5453 })
5454 .map(|runnable| (runnable.run_range.clone(), runnable)),
5455 )
5456 })
5457 .map(|(run_range, runnable, _)| (run_range, runnable))
5458 }
5459
5460 pub fn line_indents(
5461 &self,
5462 start_row: MultiBufferRow,
5463 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5464 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5465 let max_point = self.max_point();
5466 let mut cursor = self.cursor::<Point, Point>();
5467 cursor.seek(&Point::new(start_row.0, 0));
5468 iter::from_fn(move || {
5469 let mut region = cursor.region()?;
5470 while !buffer_filter(®ion.excerpt.buffer) {
5471 cursor.next();
5472 region = cursor.region()?;
5473 }
5474 let overshoot = start_row.0.saturating_sub(region.range.start.row);
5475 let buffer_start_row =
5476 (region.buffer_range.start.row + overshoot).min(region.buffer_range.end.row);
5477
5478 let buffer_end_row = if region.is_main_buffer
5479 && (region.has_trailing_newline || region.range.end == max_point)
5480 {
5481 region.buffer_range.end.row
5482 } else {
5483 region.buffer_range.end.row.saturating_sub(1)
5484 };
5485
5486 let line_indents = region
5487 .buffer
5488 .line_indents_in_row_range(buffer_start_row..buffer_end_row);
5489 cursor.next();
5490 Some(line_indents.map(move |(buffer_row, indent)| {
5491 let row = region.range.start.row + (buffer_row - region.buffer_range.start.row);
5492 (MultiBufferRow(row), indent, ®ion.excerpt.buffer)
5493 }))
5494 })
5495 .flatten()
5496 }
5497
5498 pub fn reversed_line_indents(
5499 &self,
5500 end_row: MultiBufferRow,
5501 buffer_filter: impl Fn(&BufferSnapshot) -> bool,
5502 ) -> impl Iterator<Item = (MultiBufferRow, LineIndent, &BufferSnapshot)> {
5503 let max_point = self.max_point();
5504 let mut cursor = self.cursor::<Point, Point>();
5505 cursor.seek(&Point::new(end_row.0, 0));
5506 iter::from_fn(move || {
5507 let mut region = cursor.region()?;
5508 while !buffer_filter(®ion.excerpt.buffer) {
5509 cursor.prev();
5510 region = cursor.region()?;
5511 }
5512
5513 let buffer_start_row = region.buffer_range.start.row;
5514 let buffer_end_row = if region.is_main_buffer
5515 && (region.has_trailing_newline || region.range.end == max_point)
5516 {
5517 region.buffer_range.end.row + 1
5518 } else {
5519 region.buffer_range.end.row
5520 };
5521
5522 let overshoot = end_row.0 - region.range.start.row;
5523 let buffer_end_row =
5524 (region.buffer_range.start.row + overshoot + 1).min(buffer_end_row);
5525
5526 let line_indents = region
5527 .buffer
5528 .reversed_line_indents_in_row_range(buffer_start_row..buffer_end_row);
5529 cursor.prev();
5530 Some(line_indents.map(move |(buffer_row, indent)| {
5531 let row = region.range.start.row + (buffer_row - region.buffer_range.start.row);
5532 (MultiBufferRow(row), indent, ®ion.excerpt.buffer)
5533 }))
5534 })
5535 .flatten()
5536 }
5537
5538 pub async fn enclosing_indent(
5539 &self,
5540 mut target_row: MultiBufferRow,
5541 ) -> Option<(Range<MultiBufferRow>, LineIndent)> {
5542 let max_row = MultiBufferRow(self.max_point().row);
5543 if target_row >= max_row {
5544 return None;
5545 }
5546
5547 let mut target_indent = self.line_indent_for_row(target_row);
5548
5549 // If the current row is at the start of an indented block, we want to return this
5550 // block as the enclosing indent.
5551 if !target_indent.is_line_empty() && target_row < max_row {
5552 let next_line_indent = self.line_indent_for_row(MultiBufferRow(target_row.0 + 1));
5553 if !next_line_indent.is_line_empty()
5554 && target_indent.raw_len() < next_line_indent.raw_len()
5555 {
5556 target_indent = next_line_indent;
5557 target_row.0 += 1;
5558 }
5559 }
5560
5561 const SEARCH_ROW_LIMIT: u32 = 25000;
5562 const SEARCH_WHITESPACE_ROW_LIMIT: u32 = 2500;
5563 const YIELD_INTERVAL: u32 = 100;
5564
5565 let mut accessed_row_counter = 0;
5566
5567 // If there is a blank line at the current row, search for the next non indented lines
5568 if target_indent.is_line_empty() {
5569 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_WHITESPACE_ROW_LIMIT));
5570 let end =
5571 MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_WHITESPACE_ROW_LIMIT));
5572
5573 let mut non_empty_line_above = None;
5574 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5575 if row < start {
5576 break;
5577 }
5578 accessed_row_counter += 1;
5579 if accessed_row_counter == YIELD_INTERVAL {
5580 accessed_row_counter = 0;
5581 yield_now().await;
5582 }
5583 if !indent.is_line_empty() {
5584 non_empty_line_above = Some((row, indent));
5585 break;
5586 }
5587 }
5588
5589 let mut non_empty_line_below = None;
5590 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5591 if row > end {
5592 break;
5593 }
5594 accessed_row_counter += 1;
5595 if accessed_row_counter == YIELD_INTERVAL {
5596 accessed_row_counter = 0;
5597 yield_now().await;
5598 }
5599 if !indent.is_line_empty() {
5600 non_empty_line_below = Some((row, indent));
5601 break;
5602 }
5603 }
5604
5605 let (row, indent) = match (non_empty_line_above, non_empty_line_below) {
5606 (Some((above_row, above_indent)), Some((below_row, below_indent))) => {
5607 if above_indent.raw_len() >= below_indent.raw_len() {
5608 (above_row, above_indent)
5609 } else {
5610 (below_row, below_indent)
5611 }
5612 }
5613 (Some(above), None) => above,
5614 (None, Some(below)) => below,
5615 _ => return None,
5616 };
5617
5618 target_indent = indent;
5619 target_row = row;
5620 }
5621
5622 let start = MultiBufferRow(target_row.0.saturating_sub(SEARCH_ROW_LIMIT));
5623 let end = MultiBufferRow((max_row.0 + 1).min(target_row.0 + SEARCH_ROW_LIMIT));
5624
5625 let mut start_indent = None;
5626 for (row, indent, _) in self.reversed_line_indents(target_row, |_| true) {
5627 if row < start {
5628 break;
5629 }
5630 accessed_row_counter += 1;
5631 if accessed_row_counter == YIELD_INTERVAL {
5632 accessed_row_counter = 0;
5633 yield_now().await;
5634 }
5635 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5636 start_indent = Some((row, indent));
5637 break;
5638 }
5639 }
5640 let (start_row, start_indent_size) = start_indent?;
5641
5642 let mut end_indent = (end, None);
5643 for (row, indent, _) in self.line_indents(target_row, |_| true) {
5644 if row > end {
5645 break;
5646 }
5647 accessed_row_counter += 1;
5648 if accessed_row_counter == YIELD_INTERVAL {
5649 accessed_row_counter = 0;
5650 yield_now().await;
5651 }
5652 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
5653 end_indent = (MultiBufferRow(row.0.saturating_sub(1)), Some(indent));
5654 break;
5655 }
5656 }
5657 let (end_row, end_indent_size) = end_indent;
5658
5659 let indent = if let Some(end_indent_size) = end_indent_size {
5660 if start_indent_size.raw_len() > end_indent_size.raw_len() {
5661 start_indent_size
5662 } else {
5663 end_indent_size
5664 }
5665 } else {
5666 start_indent_size
5667 };
5668
5669 Some((start_row..end_row, indent))
5670 }
5671
5672 pub fn indent_guides_in_range<T: ToPoint>(
5673 &self,
5674 range: Range<T>,
5675 ignore_disabled_for_language: bool,
5676 cx: &App,
5677 ) -> impl Iterator<Item = IndentGuide> {
5678 let range = range.start.to_point(self)..range.end.to_point(self);
5679 let start_row = MultiBufferRow(range.start.row);
5680 let end_row = MultiBufferRow(range.end.row);
5681
5682 let mut row_indents = self.line_indents(start_row, |buffer| {
5683 let settings =
5684 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx);
5685 settings.indent_guides.enabled || ignore_disabled_for_language
5686 });
5687
5688 let mut result = Vec::new();
5689 let mut indent_stack = SmallVec::<[IndentGuide; 8]>::new();
5690
5691 let mut prev_settings = None;
5692 while let Some((first_row, mut line_indent, buffer)) = row_indents.next() {
5693 if first_row > end_row {
5694 break;
5695 }
5696 let current_depth = indent_stack.len() as u32;
5697
5698 // Avoid retrieving the language settings repeatedly for every buffer row.
5699 if let Some((prev_buffer_id, _)) = &prev_settings
5700 && prev_buffer_id != &buffer.remote_id()
5701 {
5702 prev_settings.take();
5703 }
5704 let settings = &prev_settings
5705 .get_or_insert_with(|| {
5706 (
5707 buffer.remote_id(),
5708 language_settings(buffer.language().map(|l| l.name()), buffer.file(), cx),
5709 )
5710 })
5711 .1;
5712 let tab_size = settings.tab_size.get();
5713
5714 // When encountering empty, continue until found useful line indent
5715 // then add to the indent stack with the depth found
5716 let mut found_indent = false;
5717 let mut last_row = first_row;
5718 if line_indent.is_line_blank() {
5719 while !found_indent {
5720 let Some((target_row, new_line_indent, _)) = row_indents.next() else {
5721 break;
5722 };
5723 const TRAILING_ROW_SEARCH_LIMIT: u32 = 25;
5724 if target_row > MultiBufferRow(end_row.0 + TRAILING_ROW_SEARCH_LIMIT) {
5725 break;
5726 }
5727
5728 if new_line_indent.is_line_blank() {
5729 continue;
5730 }
5731 last_row = target_row.min(end_row);
5732 line_indent = new_line_indent;
5733 found_indent = true;
5734 break;
5735 }
5736 } else {
5737 found_indent = true
5738 }
5739
5740 let depth = if found_indent {
5741 line_indent.len(tab_size) / tab_size
5742 } else {
5743 0
5744 };
5745
5746 match depth.cmp(¤t_depth) {
5747 cmp::Ordering::Less => {
5748 for _ in 0..(current_depth - depth) {
5749 let mut indent = indent_stack.pop().unwrap();
5750 if last_row != first_row {
5751 // In this case, we landed on an empty row, had to seek forward,
5752 // and discovered that the indent we where on is ending.
5753 // This means that the last display row must
5754 // be on line that ends this indent range, so we
5755 // should display the range up to the first non-empty line
5756 indent.end_row = MultiBufferRow(first_row.0.saturating_sub(1));
5757 }
5758
5759 result.push(indent)
5760 }
5761 }
5762 cmp::Ordering::Greater => {
5763 for next_depth in current_depth..depth {
5764 indent_stack.push(IndentGuide {
5765 buffer_id: buffer.remote_id(),
5766 start_row: first_row,
5767 end_row: last_row,
5768 depth: next_depth,
5769 tab_size,
5770 settings: settings.indent_guides.clone(),
5771 });
5772 }
5773 }
5774 _ => {}
5775 }
5776
5777 for indent in indent_stack.iter_mut() {
5778 indent.end_row = last_row;
5779 }
5780 }
5781
5782 result.extend(indent_stack);
5783 result.into_iter()
5784 }
5785
5786 pub fn trailing_excerpt_update_count(&self) -> usize {
5787 self.trailing_excerpt_update_count
5788 }
5789
5790 pub fn file_at<T: ToOffset>(&self, point: T) -> Option<&Arc<dyn File>> {
5791 self.point_to_buffer_offset(point)
5792 .and_then(|(buffer, _)| buffer.file())
5793 }
5794
5795 pub fn language_at<T: ToOffset>(&self, point: T) -> Option<&Arc<Language>> {
5796 self.point_to_buffer_offset(point)
5797 .and_then(|(buffer, offset)| buffer.language_at(offset))
5798 }
5799
5800 fn language_settings<'a>(&'a self, cx: &'a App) -> Cow<'a, LanguageSettings> {
5801 self.excerpts
5802 .first()
5803 .map(|excerpt| &excerpt.buffer)
5804 .map(|buffer| {
5805 language_settings(
5806 buffer.language().map(|language| language.name()),
5807 buffer.file(),
5808 cx,
5809 )
5810 })
5811 .unwrap_or_else(move || self.language_settings_at(MultiBufferOffset::ZERO, cx))
5812 }
5813
5814 pub fn language_settings_at<'a, T: ToOffset>(
5815 &'a self,
5816 point: T,
5817 cx: &'a App,
5818 ) -> Cow<'a, LanguageSettings> {
5819 let mut language = None;
5820 let mut file = None;
5821 if let Some((buffer, offset)) = self.point_to_buffer_offset(point) {
5822 language = buffer.language_at(offset);
5823 file = buffer.file();
5824 }
5825 language_settings(language.map(|l| l.name()), file, cx)
5826 }
5827
5828 pub fn language_scope_at<T: ToOffset>(&self, point: T) -> Option<LanguageScope> {
5829 self.point_to_buffer_offset(point)
5830 .and_then(|(buffer, offset)| buffer.language_scope_at(offset))
5831 }
5832
5833 pub fn char_classifier_at<T: ToOffset>(&self, point: T) -> CharClassifier {
5834 self.point_to_buffer_offset(point)
5835 .map(|(buffer, offset)| buffer.char_classifier_at(offset))
5836 .unwrap_or_default()
5837 }
5838
5839 pub fn language_indent_size_at<T: ToOffset>(
5840 &self,
5841 position: T,
5842 cx: &App,
5843 ) -> Option<IndentSize> {
5844 let (buffer_snapshot, offset) = self.point_to_buffer_offset(position)?;
5845 Some(buffer_snapshot.language_indent_size_at(offset, cx))
5846 }
5847
5848 pub fn is_dirty(&self) -> bool {
5849 self.is_dirty
5850 }
5851
5852 pub fn has_deleted_file(&self) -> bool {
5853 self.has_deleted_file
5854 }
5855
5856 pub fn has_conflict(&self) -> bool {
5857 self.has_conflict
5858 }
5859
5860 pub fn has_diagnostics(&self) -> bool {
5861 self.excerpts
5862 .iter()
5863 .any(|excerpt| excerpt.buffer.has_diagnostics())
5864 }
5865
5866 pub fn diagnostic_group(
5867 &self,
5868 buffer_id: BufferId,
5869 group_id: usize,
5870 ) -> impl Iterator<Item = DiagnosticEntryRef<'_, Point>> + '_ {
5871 self.lift_buffer_metadata::<Point, _, _>(
5872 Point::zero()..self.max_point(),
5873 move |buffer, range| {
5874 if buffer.remote_id() != buffer_id {
5875 return None;
5876 };
5877 Some(
5878 buffer
5879 .diagnostics_in_range(range, false)
5880 .filter(move |diagnostic| diagnostic.diagnostic.group_id == group_id)
5881 .map(move |DiagnosticEntryRef { diagnostic, range }| (range, diagnostic)),
5882 )
5883 },
5884 )
5885 .map(|(range, diagnostic, _)| DiagnosticEntryRef { diagnostic, range })
5886 }
5887
5888 pub fn diagnostics_in_range<'a, MBD>(
5889 &'a self,
5890 range: Range<MBD>,
5891 ) -> impl Iterator<Item = DiagnosticEntryRef<'a, MBD>> + 'a
5892 where
5893 MBD::TextDimension: 'a
5894 + text::ToOffset
5895 + text::FromAnchor
5896 + Sub<Output = MBD::TextDimension>
5897 + fmt::Debug
5898 + ops::Add<Output = MBD::TextDimension>
5899 + ops::AddAssign
5900 + Ord,
5901 MBD: MultiBufferDimension
5902 + Ord
5903 + Sub<Output = MBD::TextDimension>
5904 + ops::Add<MBD::TextDimension, Output = MBD>
5905 + ops::AddAssign<MBD::TextDimension>
5906 + 'a,
5907 {
5908 self.lift_buffer_metadata::<MBD, _, _>(range, move |buffer, buffer_range| {
5909 Some(
5910 buffer
5911 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
5912 .map(|entry| (entry.range, entry.diagnostic)),
5913 )
5914 })
5915 .map(|(range, diagnostic, _)| DiagnosticEntryRef { diagnostic, range })
5916 }
5917
5918 pub fn diagnostics_with_buffer_ids_in_range<'a, MBD>(
5919 &'a self,
5920 range: Range<MBD>,
5921 ) -> impl Iterator<Item = (BufferId, DiagnosticEntryRef<'a, MBD>)> + 'a
5922 where
5923 MBD: MultiBufferDimension
5924 + Ord
5925 + Sub<Output = MBD::TextDimension>
5926 + ops::Add<MBD::TextDimension, Output = MBD>
5927 + ops::AddAssign<MBD::TextDimension>,
5928 MBD::TextDimension: Sub<Output = MBD::TextDimension>
5929 + ops::Add<Output = MBD::TextDimension>
5930 + text::ToOffset
5931 + text::FromAnchor
5932 + AddAssign<MBD::TextDimension>
5933 + Ord,
5934 {
5935 self.lift_buffer_metadata::<MBD, _, _>(range, move |buffer, buffer_range| {
5936 Some(
5937 buffer
5938 .diagnostics_in_range(buffer_range.start..buffer_range.end, false)
5939 .map(|entry| (entry.range, entry.diagnostic)),
5940 )
5941 })
5942 .map(|(range, diagnostic, b)| (b.buffer_id, DiagnosticEntryRef { diagnostic, range }))
5943 }
5944
5945 pub fn syntax_ancestor<T: ToOffset>(
5946 &self,
5947 range: Range<T>,
5948 ) -> Option<(tree_sitter::Node<'_>, Range<MultiBufferOffset>)> {
5949 let range = range.start.to_offset(self)..range.end.to_offset(self);
5950 let mut excerpt = self.excerpt_containing(range.clone())?;
5951 let node = excerpt
5952 .buffer()
5953 .syntax_ancestor(excerpt.map_range_to_buffer(range))?;
5954 let node_range = node.byte_range();
5955 let node_range = BufferOffset(node_range.start)..BufferOffset(node_range.end);
5956 if !excerpt.contains_buffer_range(node_range.clone()) {
5957 return None;
5958 };
5959 Some((node, excerpt.map_range_from_buffer(node_range)))
5960 }
5961
5962 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
5963 let (excerpt_id, _, buffer) = self.as_singleton()?;
5964 let outline = buffer.outline(theme);
5965 Some(Outline::new(
5966 outline
5967 .items
5968 .into_iter()
5969 .flat_map(|item| {
5970 Some(OutlineItem {
5971 depth: item.depth,
5972 range: self.anchor_range_in_excerpt(*excerpt_id, item.range)?,
5973 source_range_for_text: self
5974 .anchor_range_in_excerpt(*excerpt_id, item.source_range_for_text)?,
5975 text: item.text,
5976 highlight_ranges: item.highlight_ranges,
5977 name_ranges: item.name_ranges,
5978 body_range: item.body_range.and_then(|body_range| {
5979 self.anchor_range_in_excerpt(*excerpt_id, body_range)
5980 }),
5981 annotation_range: item.annotation_range.and_then(|annotation_range| {
5982 self.anchor_range_in_excerpt(*excerpt_id, annotation_range)
5983 }),
5984 })
5985 })
5986 .collect(),
5987 ))
5988 }
5989
5990 pub fn symbols_containing<T: ToOffset>(
5991 &self,
5992 offset: T,
5993 theme: Option<&SyntaxTheme>,
5994 ) -> Option<(BufferId, Vec<OutlineItem<Anchor>>)> {
5995 let anchor = self.anchor_before(offset);
5996 let excerpt_id = anchor.excerpt_id;
5997 let excerpt = self.excerpt(excerpt_id)?;
5998 let buffer_id = excerpt.buffer_id;
5999 Some((
6000 buffer_id,
6001 excerpt
6002 .buffer
6003 .symbols_containing(anchor.text_anchor, theme)
6004 .into_iter()
6005 .flat_map(|item| {
6006 Some(OutlineItem {
6007 depth: item.depth,
6008 source_range_for_text: Anchor::range_in_buffer(
6009 excerpt_id,
6010 buffer_id,
6011 item.source_range_for_text,
6012 ),
6013 range: Anchor::range_in_buffer(excerpt_id, buffer_id, item.range),
6014 text: item.text,
6015 highlight_ranges: item.highlight_ranges,
6016 name_ranges: item.name_ranges,
6017 body_range: item.body_range.map(|body_range| {
6018 Anchor::range_in_buffer(excerpt_id, buffer_id, body_range)
6019 }),
6020 annotation_range: item.annotation_range.map(|body_range| {
6021 Anchor::range_in_buffer(excerpt_id, buffer_id, body_range)
6022 }),
6023 })
6024 })
6025 .collect(),
6026 ))
6027 }
6028
6029 fn excerpt_locator_for_id(&self, id: ExcerptId) -> &Locator {
6030 if id == ExcerptId::min() {
6031 Locator::min_ref()
6032 } else if id == ExcerptId::max() {
6033 Locator::max_ref()
6034 } else {
6035 let (_, _, item) = self.excerpt_ids.find::<ExcerptId, _>((), &id, Bias::Left);
6036 if let Some(entry) = item
6037 && entry.id == id
6038 {
6039 return &entry.locator;
6040 }
6041 panic!("invalid excerpt id {id:?}")
6042 }
6043 }
6044
6045 /// Returns the locators referenced by the given excerpt IDs, sorted by locator.
6046 fn excerpt_locators_for_ids(
6047 &self,
6048 ids: impl IntoIterator<Item = ExcerptId>,
6049 ) -> SmallVec<[Locator; 1]> {
6050 let mut sorted_ids = ids.into_iter().collect::<SmallVec<[_; 1]>>();
6051 sorted_ids.sort_unstable();
6052 sorted_ids.dedup();
6053 let mut locators = SmallVec::new();
6054
6055 while sorted_ids.last() == Some(&ExcerptId::max()) {
6056 sorted_ids.pop();
6057 locators.push(Locator::max());
6058 }
6059
6060 let mut sorted_ids = sorted_ids.into_iter().peekable();
6061 locators.extend(
6062 sorted_ids
6063 .peeking_take_while(|excerpt| *excerpt == ExcerptId::min())
6064 .map(|_| Locator::min()),
6065 );
6066
6067 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>(());
6068 for id in sorted_ids {
6069 if cursor.seek_forward(&id, Bias::Left) {
6070 locators.push(cursor.item().unwrap().locator.clone());
6071 } else {
6072 panic!("invalid excerpt id {:?}", id);
6073 }
6074 }
6075
6076 locators.sort_unstable();
6077 locators
6078 }
6079
6080 pub fn buffer_id_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<BufferId> {
6081 Some(self.excerpt(excerpt_id)?.buffer_id)
6082 }
6083
6084 pub fn buffer_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<&BufferSnapshot> {
6085 Some(&self.excerpt(excerpt_id)?.buffer)
6086 }
6087
6088 pub fn range_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<Range<Point>> {
6089 let mut cursor = self
6090 .excerpts
6091 .cursor::<Dimensions<Option<&Locator>, ExcerptPoint>>(());
6092 let locator = self.excerpt_locator_for_id(excerpt_id);
6093 let mut sought_exact = cursor.seek(&Some(locator), Bias::Left);
6094 if cursor.item().is_none() && excerpt_id == ExcerptId::max() {
6095 sought_exact = true;
6096 cursor.prev();
6097 } else if excerpt_id == ExcerptId::min() {
6098 sought_exact = true;
6099 }
6100 if sought_exact {
6101 let start = cursor.start().1;
6102 let end = cursor.end().1;
6103 let mut diff_transforms = self
6104 .diff_transforms
6105 .cursor::<Dimensions<ExcerptPoint, OutputDimension<Point>>>(());
6106 diff_transforms.seek(&start, Bias::Left);
6107 let overshoot = start - diff_transforms.start().0;
6108 let start = diff_transforms.start().1 + overshoot;
6109 diff_transforms.seek(&end, Bias::Right);
6110 let overshoot = end - diff_transforms.start().0;
6111 let end = diff_transforms.start().1 + overshoot;
6112 Some(start.0..end.0)
6113 } else {
6114 None
6115 }
6116 }
6117
6118 fn excerpt(&self, excerpt_id: ExcerptId) -> Option<&Excerpt> {
6119 let mut cursor = self.excerpts.cursor::<Option<&Locator>>(());
6120 let locator = self.excerpt_locator_for_id(excerpt_id);
6121 cursor.seek(&Some(locator), Bias::Left);
6122 if let Some(excerpt) = cursor.item()
6123 && excerpt.id == excerpt_id
6124 {
6125 return Some(excerpt);
6126 } else if cursor.item().is_none() && excerpt_id == ExcerptId::max() {
6127 cursor.prev();
6128 return cursor.item();
6129 }
6130 None
6131 }
6132
6133 /// Returns the excerpt containing range and its offset start within the multibuffer or none if `range` spans multiple excerpts
6134 pub fn excerpt_containing<T: ToOffset>(
6135 &self,
6136 range: Range<T>,
6137 ) -> Option<MultiBufferExcerpt<'_>> {
6138 let range = range.start.to_offset(self)..range.end.to_offset(self);
6139 let mut cursor = self.cursor::<MultiBufferOffset, BufferOffset>();
6140 cursor.seek(&range.start);
6141
6142 let start_excerpt = cursor.excerpt()?;
6143 if range.end != range.start {
6144 cursor.seek_forward(&range.end);
6145 if cursor.excerpt()?.id != start_excerpt.id {
6146 return None;
6147 }
6148 }
6149
6150 cursor.seek_to_start_of_current_excerpt();
6151 let region = cursor.region()?;
6152 let offset = region.range.start;
6153 let buffer_offset = start_excerpt.buffer_start_offset();
6154 let excerpt_offset = *cursor.excerpts.start();
6155 Some(MultiBufferExcerpt {
6156 diff_transforms: cursor.diff_transforms,
6157 excerpt: start_excerpt,
6158 offset,
6159 buffer_offset,
6160 excerpt_offset,
6161 })
6162 }
6163
6164 pub fn buffer_id_for_anchor(&self, anchor: Anchor) -> Option<BufferId> {
6165 if let Some(id) = anchor.buffer_id {
6166 return Some(id);
6167 }
6168 let excerpt = self.excerpt_containing(anchor..anchor)?;
6169 Some(excerpt.buffer_id())
6170 }
6171
6172 pub fn selections_in_range<'a>(
6173 &'a self,
6174 range: &'a Range<Anchor>,
6175 include_local: bool,
6176 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
6177 let mut cursor = self.excerpts.cursor::<ExcerptSummary>(());
6178 let start_locator = self.excerpt_locator_for_id(range.start.excerpt_id);
6179 let end_locator = self.excerpt_locator_for_id(range.end.excerpt_id);
6180 cursor.seek(start_locator, Bias::Left);
6181 cursor
6182 .take_while(move |excerpt| excerpt.locator <= *end_locator)
6183 .flat_map(move |excerpt| {
6184 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
6185 if excerpt.id == range.start.excerpt_id {
6186 query_range.start = range.start.text_anchor;
6187 }
6188 if excerpt.id == range.end.excerpt_id {
6189 query_range.end = range.end.text_anchor;
6190 }
6191
6192 excerpt
6193 .buffer
6194 .selections_in_range(query_range, include_local)
6195 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
6196 selections.map(move |selection| {
6197 let mut start =
6198 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, selection.start);
6199 let mut end =
6200 Anchor::in_buffer(excerpt.id, excerpt.buffer_id, selection.end);
6201 if range.start.cmp(&start, self).is_gt() {
6202 start = range.start;
6203 }
6204 if range.end.cmp(&end, self).is_lt() {
6205 end = range.end;
6206 }
6207
6208 (
6209 replica_id,
6210 line_mode,
6211 cursor_shape,
6212 Selection {
6213 id: selection.id,
6214 start,
6215 end,
6216 reversed: selection.reversed,
6217 goal: selection.goal,
6218 },
6219 )
6220 })
6221 })
6222 })
6223 }
6224
6225 pub fn show_headers(&self) -> bool {
6226 self.show_headers
6227 }
6228
6229 pub fn diff_for_buffer_id(&self, buffer_id: BufferId) -> Option<&BufferDiffSnapshot> {
6230 self.diffs.get(&buffer_id)
6231 }
6232
6233 /// Visually annotates a position or range with the `Debug` representation of a value. The
6234 /// callsite of this function is used as a key - previous annotations will be removed.
6235 #[cfg(debug_assertions)]
6236 #[track_caller]
6237 pub fn debug<V, R>(&self, ranges: &R, value: V)
6238 where
6239 R: debug::ToMultiBufferDebugRanges,
6240 V: std::fmt::Debug,
6241 {
6242 self.debug_with_key(std::panic::Location::caller(), ranges, value);
6243 }
6244
6245 /// Visually annotates a position or range with the `Debug` representation of a value. Previous
6246 /// debug annotations with the same key will be removed. The key is also used to determine the
6247 /// annotation's color.
6248 #[cfg(debug_assertions)]
6249 #[track_caller]
6250 pub fn debug_with_key<K, R, V>(&self, key: &K, ranges: &R, value: V)
6251 where
6252 K: std::hash::Hash + 'static,
6253 R: debug::ToMultiBufferDebugRanges,
6254 V: std::fmt::Debug,
6255 {
6256 let text_ranges = ranges
6257 .to_multi_buffer_debug_ranges(self)
6258 .into_iter()
6259 .flat_map(|range| {
6260 self.range_to_buffer_ranges(range).into_iter().map(
6261 |(buffer, range, _excerpt_id)| {
6262 buffer.anchor_after(range.start)..buffer.anchor_before(range.end)
6263 },
6264 )
6265 })
6266 .collect();
6267 text::debug::GlobalDebugRanges::with_locked(|debug_ranges| {
6268 debug_ranges.insert(key, text_ranges, format!("{value:?}").into())
6269 });
6270 }
6271}
6272
6273#[cfg(any(test, feature = "test-support"))]
6274impl MultiBufferSnapshot {
6275 pub fn random_byte_range(
6276 &self,
6277 start_offset: MultiBufferOffset,
6278 rng: &mut impl rand::Rng,
6279 ) -> Range<MultiBufferOffset> {
6280 let end = self.clip_offset(rng.random_range(start_offset..=self.len()), Bias::Right);
6281 let start = self.clip_offset(rng.random_range(start_offset..=end), Bias::Right);
6282 start..end
6283 }
6284
6285 #[cfg(any(test, feature = "test-support"))]
6286 fn check_invariants(&self) {
6287 let excerpts = self.excerpts.items(());
6288 let excerpt_ids = self.excerpt_ids.items(());
6289
6290 for (ix, excerpt) in excerpts.iter().enumerate() {
6291 if ix == 0 {
6292 if excerpt.locator <= Locator::min() {
6293 panic!("invalid first excerpt locator {:?}", excerpt.locator);
6294 }
6295 } else if excerpt.locator <= excerpts[ix - 1].locator {
6296 panic!("excerpts are out-of-order: {:?}", excerpts);
6297 }
6298 }
6299
6300 for (ix, entry) in excerpt_ids.iter().enumerate() {
6301 if ix == 0 {
6302 if entry.id.cmp(&ExcerptId::min(), self).is_le() {
6303 panic!("invalid first excerpt id {:?}", entry.id);
6304 }
6305 } else if entry.id <= excerpt_ids[ix - 1].id {
6306 panic!("excerpt ids are out-of-order: {:?}", excerpt_ids);
6307 }
6308 }
6309
6310 if self.diff_transforms.summary().input != self.excerpts.summary().text {
6311 panic!(
6312 "incorrect input summary. expected {:?}, got {:?}. transforms: {:+?}",
6313 self.excerpts.summary().text,
6314 self.diff_transforms.summary().input,
6315 self.diff_transforms.items(()),
6316 );
6317 }
6318
6319 let mut prev_transform: Option<&DiffTransform> = None;
6320 for item in self.diff_transforms.iter() {
6321 if let DiffTransform::BufferContent {
6322 summary,
6323 inserted_hunk_info,
6324 } = item
6325 {
6326 if let Some(DiffTransform::BufferContent {
6327 inserted_hunk_info: prev_inserted_hunk_info,
6328 ..
6329 }) = prev_transform
6330 && *inserted_hunk_info == *prev_inserted_hunk_info
6331 {
6332 panic!(
6333 "multiple adjacent buffer content transforms with is_inserted_hunk = {inserted_hunk_info:?}. transforms: {:+?}",
6334 self.diff_transforms.items(())
6335 );
6336 }
6337 if summary.len == MultiBufferOffset(0) && !self.is_empty() {
6338 panic!("empty buffer content transform");
6339 }
6340 }
6341 prev_transform = Some(item);
6342 }
6343 }
6344}
6345
6346impl<'a, MBD, BD> MultiBufferCursor<'a, MBD, BD>
6347where
6348 MBD: MultiBufferDimension + Ord + Sub + ops::AddAssign<<MBD as Sub>::Output>,
6349 BD: TextDimension + AddAssign<<MBD as Sub>::Output>,
6350{
6351 fn seek(&mut self, position: &MBD) {
6352 let position = OutputDimension(*position);
6353 self.cached_region.take();
6354 self.diff_transforms.seek(&position, Bias::Right);
6355 if self.diff_transforms.item().is_none()
6356 && self.diff_transforms.start().output_dimension == position
6357 {
6358 self.diff_transforms.prev();
6359 }
6360
6361 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension;
6362 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6363 let overshoot = position - self.diff_transforms.start().output_dimension;
6364 excerpt_position += overshoot;
6365 }
6366
6367 self.excerpts.seek(&excerpt_position, Bias::Right);
6368 if self.excerpts.item().is_none() && excerpt_position == *self.excerpts.start() {
6369 self.excerpts.prev();
6370 }
6371 }
6372
6373 fn seek_forward(&mut self, position: &MBD) {
6374 let position = OutputDimension(*position);
6375 self.cached_region.take();
6376 self.diff_transforms.seek_forward(&position, Bias::Right);
6377 if self.diff_transforms.item().is_none()
6378 && self.diff_transforms.start().output_dimension == position
6379 {
6380 self.diff_transforms.prev();
6381 }
6382
6383 let overshoot = position - self.diff_transforms.start().output_dimension;
6384 let mut excerpt_position = self.diff_transforms.start().excerpt_dimension;
6385 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6386 excerpt_position += overshoot;
6387 }
6388
6389 self.excerpts.seek_forward(&excerpt_position, Bias::Right);
6390 if self.excerpts.item().is_none() && excerpt_position == *self.excerpts.start() {
6391 self.excerpts.prev();
6392 }
6393 }
6394
6395 fn next_excerpt(&mut self) {
6396 self.excerpts.next();
6397 self.seek_to_start_of_current_excerpt();
6398 }
6399
6400 fn prev_excerpt(&mut self) {
6401 self.excerpts.prev();
6402 self.seek_to_start_of_current_excerpt();
6403 }
6404
6405 fn seek_to_start_of_current_excerpt(&mut self) {
6406 self.cached_region.take();
6407 self.diff_transforms.seek(self.excerpts.start(), Bias::Left);
6408 if self.diff_transforms.end().excerpt_dimension == *self.excerpts.start()
6409 && self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6410 && self.diff_transforms.next_item().is_some()
6411 {
6412 self.diff_transforms.next();
6413 }
6414 }
6415
6416 fn next(&mut self) {
6417 self.cached_region.take();
6418 match self
6419 .diff_transforms
6420 .end()
6421 .excerpt_dimension
6422 .cmp(&self.excerpts.end())
6423 {
6424 cmp::Ordering::Less => self.diff_transforms.next(),
6425 cmp::Ordering::Greater => self.excerpts.next(),
6426 cmp::Ordering::Equal => {
6427 self.diff_transforms.next();
6428 if self.diff_transforms.end().excerpt_dimension > self.excerpts.end()
6429 || self.diff_transforms.item().is_none()
6430 {
6431 self.excerpts.next();
6432 } else if let Some(DiffTransform::DeletedHunk { hunk_info, .. }) =
6433 self.diff_transforms.item()
6434 && self
6435 .excerpts
6436 .item()
6437 .is_some_and(|excerpt| excerpt.id != hunk_info.excerpt_id)
6438 {
6439 self.excerpts.next();
6440 }
6441 }
6442 }
6443 }
6444
6445 fn prev(&mut self) {
6446 self.cached_region.take();
6447 match self
6448 .diff_transforms
6449 .start()
6450 .excerpt_dimension
6451 .cmp(self.excerpts.start())
6452 {
6453 cmp::Ordering::Less => self.excerpts.prev(),
6454 cmp::Ordering::Greater => self.diff_transforms.prev(),
6455 cmp::Ordering::Equal => {
6456 self.diff_transforms.prev();
6457 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start()
6458 || self.diff_transforms.item().is_none()
6459 {
6460 self.excerpts.prev();
6461 }
6462 }
6463 }
6464 }
6465
6466 fn region(&mut self) -> Option<MultiBufferRegion<'a, MBD, BD>> {
6467 if self.cached_region.is_none() {
6468 self.cached_region = self.build_region();
6469 }
6470 self.cached_region.clone()
6471 }
6472
6473 fn is_at_start_of_excerpt(&mut self) -> bool {
6474 if self.diff_transforms.start().excerpt_dimension > *self.excerpts.start() {
6475 return false;
6476 } else if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
6477 return true;
6478 }
6479
6480 self.diff_transforms.prev();
6481 let prev_transform = self.diff_transforms.item();
6482 self.diff_transforms.next();
6483
6484 prev_transform.is_none_or(|next_transform| {
6485 matches!(next_transform, DiffTransform::BufferContent { .. })
6486 })
6487 }
6488
6489 fn is_at_end_of_excerpt(&mut self) -> bool {
6490 if self.diff_transforms.end().excerpt_dimension < self.excerpts.end() {
6491 return false;
6492 } else if self.diff_transforms.end().excerpt_dimension > self.excerpts.end()
6493 || self.diff_transforms.item().is_none()
6494 {
6495 return true;
6496 }
6497
6498 let next_transform = self.diff_transforms.next_item();
6499 next_transform.is_none_or(|next_transform| match next_transform {
6500 DiffTransform::BufferContent { .. } => true,
6501 DiffTransform::DeletedHunk { hunk_info, .. } => self
6502 .excerpts
6503 .item()
6504 .is_some_and(|excerpt| excerpt.id != hunk_info.excerpt_id),
6505 })
6506 }
6507
6508 fn main_buffer_position(&self) -> Option<BD> {
6509 let excerpt = self.excerpts.item()?;
6510 let buffer = &excerpt.buffer;
6511 let buffer_context_start = excerpt.range.context.start.summary::<BD>(buffer);
6512 let mut buffer_start = buffer_context_start;
6513 let overshoot = self.diff_transforms.end().excerpt_dimension - *self.excerpts.start();
6514 buffer_start += overshoot;
6515 Some(buffer_start)
6516 }
6517
6518 fn build_region(&self) -> Option<MultiBufferRegion<'a, MBD, BD>> {
6519 let excerpt = self.excerpts.item()?;
6520 match self.diff_transforms.item()? {
6521 DiffTransform::DeletedHunk {
6522 buffer_id,
6523 base_text_byte_range,
6524 has_trailing_newline,
6525 hunk_info,
6526 ..
6527 } => {
6528 let diff = self.diffs.get(buffer_id)?;
6529 let buffer = diff.base_text();
6530 let mut rope_cursor = buffer.as_rope().cursor(0);
6531 let buffer_start = rope_cursor.summary::<BD>(base_text_byte_range.start);
6532 let buffer_range_len = rope_cursor.summary::<BD>(base_text_byte_range.end);
6533 let mut buffer_end = buffer_start;
6534 TextDimension::add_assign(&mut buffer_end, &buffer_range_len);
6535 let start = self.diff_transforms.start().output_dimension.0;
6536 let end = self.diff_transforms.end().output_dimension.0;
6537 Some(MultiBufferRegion {
6538 buffer,
6539 excerpt,
6540 has_trailing_newline: *has_trailing_newline,
6541 is_main_buffer: false,
6542 diff_hunk_status: Some(DiffHunkStatus::deleted(
6543 hunk_info.hunk_secondary_status,
6544 )),
6545 buffer_range: buffer_start..buffer_end,
6546 range: start..end,
6547 })
6548 }
6549 DiffTransform::BufferContent {
6550 inserted_hunk_info, ..
6551 } => {
6552 let buffer = &excerpt.buffer;
6553 let buffer_context_start = excerpt.range.context.start.summary::<BD>(buffer);
6554
6555 let mut start = self.diff_transforms.start().output_dimension.0;
6556 let mut buffer_start = buffer_context_start;
6557 if self.diff_transforms.start().excerpt_dimension < *self.excerpts.start() {
6558 let overshoot =
6559 *self.excerpts.start() - self.diff_transforms.start().excerpt_dimension;
6560 start += overshoot;
6561 } else {
6562 let overshoot =
6563 self.diff_transforms.start().excerpt_dimension - *self.excerpts.start();
6564 buffer_start += overshoot;
6565 }
6566
6567 let mut end;
6568 let mut buffer_end;
6569 let has_trailing_newline;
6570 if self.diff_transforms.end().excerpt_dimension < self.excerpts.end() {
6571 let overshoot =
6572 self.diff_transforms.end().excerpt_dimension - *self.excerpts.start();
6573 end = self.diff_transforms.end().output_dimension.0;
6574 buffer_end = buffer_context_start;
6575 buffer_end += overshoot;
6576 has_trailing_newline = false;
6577 } else {
6578 let overshoot =
6579 self.excerpts.end() - self.diff_transforms.start().excerpt_dimension;
6580 end = self.diff_transforms.start().output_dimension.0;
6581 end += overshoot;
6582 buffer_end = excerpt.range.context.end.summary::<BD>(buffer);
6583 has_trailing_newline = excerpt.has_trailing_newline;
6584 };
6585
6586 Some(MultiBufferRegion {
6587 buffer,
6588 excerpt,
6589 has_trailing_newline,
6590 is_main_buffer: true,
6591 diff_hunk_status: inserted_hunk_info
6592 .map(|info| DiffHunkStatus::added(info.hunk_secondary_status)),
6593 buffer_range: buffer_start..buffer_end,
6594 range: start..end,
6595 })
6596 }
6597 }
6598 }
6599
6600 fn excerpt(&self) -> Option<&'a Excerpt> {
6601 self.excerpts.item()
6602 }
6603}
6604
6605impl Excerpt {
6606 fn new(
6607 id: ExcerptId,
6608 locator: Locator,
6609 buffer_id: BufferId,
6610 buffer: BufferSnapshot,
6611 range: ExcerptRange<text::Anchor>,
6612 has_trailing_newline: bool,
6613 ) -> Self {
6614 Excerpt {
6615 id,
6616 locator,
6617 max_buffer_row: range.context.end.to_point(&buffer).row,
6618 text_summary: buffer
6619 .text_summary_for_range::<TextSummary, _>(range.context.to_offset(&buffer)),
6620 buffer_id,
6621 buffer,
6622 range,
6623 has_trailing_newline,
6624 }
6625 }
6626
6627 fn chunks_in_range(&self, range: Range<usize>, language_aware: bool) -> ExcerptChunks<'_> {
6628 let content_start = self.range.context.start.to_offset(&self.buffer);
6629 let chunks_start = content_start + range.start;
6630 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
6631
6632 let has_footer = self.has_trailing_newline
6633 && range.start <= self.text_summary.len
6634 && range.end > self.text_summary.len;
6635
6636 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
6637
6638 ExcerptChunks {
6639 excerpt_id: self.id,
6640 content_chunks,
6641 has_footer,
6642 }
6643 }
6644
6645 fn seek_chunks(&self, excerpt_chunks: &mut ExcerptChunks, range: Range<usize>) {
6646 let content_start = self.range.context.start.to_offset(&self.buffer);
6647 let chunks_start = content_start + range.start;
6648 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
6649 excerpt_chunks.content_chunks.seek(chunks_start..chunks_end);
6650 excerpt_chunks.has_footer = self.has_trailing_newline
6651 && range.start <= self.text_summary.len
6652 && range.end > self.text_summary.len;
6653 }
6654
6655 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
6656 if text_anchor
6657 .cmp(&self.range.context.start, &self.buffer)
6658 .is_lt()
6659 {
6660 self.range.context.start
6661 } else if text_anchor
6662 .cmp(&self.range.context.end, &self.buffer)
6663 .is_gt()
6664 {
6665 self.range.context.end
6666 } else {
6667 text_anchor
6668 }
6669 }
6670
6671 fn contains(&self, anchor: &Anchor) -> bool {
6672 (anchor.buffer_id == None || anchor.buffer_id == Some(self.buffer_id))
6673 && self
6674 .range
6675 .context
6676 .start
6677 .cmp(&anchor.text_anchor, &self.buffer)
6678 .is_le()
6679 && self
6680 .range
6681 .context
6682 .end
6683 .cmp(&anchor.text_anchor, &self.buffer)
6684 .is_ge()
6685 }
6686
6687 /// The [`Excerpt`]'s start offset in its [`Buffer`]
6688 fn buffer_start_offset(&self) -> BufferOffset {
6689 BufferOffset(self.range.context.start.to_offset(&self.buffer))
6690 }
6691
6692 /// The [`Excerpt`]'s end offset in its [`Buffer`]
6693 fn buffer_end_offset(&self) -> BufferOffset {
6694 self.buffer_start_offset() + self.text_summary.len
6695 }
6696}
6697
6698impl<'a> MultiBufferExcerpt<'a> {
6699 pub fn id(&self) -> ExcerptId {
6700 self.excerpt.id
6701 }
6702
6703 pub fn buffer_id(&self) -> BufferId {
6704 self.excerpt.buffer_id
6705 }
6706
6707 pub fn start_anchor(&self) -> Anchor {
6708 Anchor::in_buffer(
6709 self.excerpt.id,
6710 self.excerpt.buffer_id,
6711 self.excerpt.range.context.start,
6712 )
6713 }
6714
6715 pub fn end_anchor(&self) -> Anchor {
6716 Anchor::in_buffer(
6717 self.excerpt.id,
6718 self.excerpt.buffer_id,
6719 self.excerpt.range.context.end,
6720 )
6721 }
6722
6723 pub fn buffer(&self) -> &'a BufferSnapshot {
6724 &self.excerpt.buffer
6725 }
6726
6727 pub fn buffer_range(&self) -> Range<BufferOffset> {
6728 self.buffer_offset
6729 ..BufferOffset(
6730 self.excerpt
6731 .range
6732 .context
6733 .end
6734 .to_offset(&self.excerpt.buffer.text),
6735 )
6736 }
6737
6738 pub fn start_offset(&self) -> MultiBufferOffset {
6739 self.offset
6740 }
6741
6742 /// Maps an offset within the [`MultiBuffer`] to an offset within the [`Buffer`]
6743 pub fn map_offset_to_buffer(&mut self, offset: MultiBufferOffset) -> BufferOffset {
6744 self.map_range_to_buffer(offset..offset).start
6745 }
6746
6747 /// Maps a range within the [`MultiBuffer`] to a range within the [`Buffer`]
6748 pub fn map_range_to_buffer(&mut self, range: Range<MultiBufferOffset>) -> Range<BufferOffset> {
6749 self.diff_transforms
6750 .seek(&OutputDimension(range.start), Bias::Right);
6751 let start = self.map_offset_to_buffer_internal(range.start);
6752 let end = if range.end > range.start {
6753 self.diff_transforms
6754 .seek_forward(&OutputDimension(range.end), Bias::Right);
6755 self.map_offset_to_buffer_internal(range.end)
6756 } else {
6757 start
6758 };
6759 start..end
6760 }
6761
6762 fn map_offset_to_buffer_internal(&self, offset: MultiBufferOffset) -> BufferOffset {
6763 let mut excerpt_offset = self.diff_transforms.start().excerpt_dimension;
6764 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
6765 excerpt_offset += offset - self.diff_transforms.start().output_dimension.0;
6766 };
6767 let offset_in_excerpt = excerpt_offset.saturating_sub(self.excerpt_offset);
6768 self.buffer_offset + offset_in_excerpt
6769 }
6770
6771 /// Map an offset within the [`Buffer`] to an offset within the [`MultiBuffer`]
6772 pub fn map_offset_from_buffer(&mut self, buffer_offset: BufferOffset) -> MultiBufferOffset {
6773 self.map_range_from_buffer(buffer_offset..buffer_offset)
6774 .start
6775 }
6776
6777 /// Map a range within the [`Buffer`] to a range within the [`MultiBuffer`]
6778 pub fn map_range_from_buffer(
6779 &mut self,
6780 buffer_range: Range<BufferOffset>,
6781 ) -> Range<MultiBufferOffset> {
6782 if buffer_range.start < self.buffer_offset {
6783 log::warn!(
6784 "Attempting to map a range from a buffer offset that starts before the current buffer offset"
6785 );
6786 return self.offset..self.offset;
6787 }
6788 let overshoot = buffer_range.start - self.buffer_offset;
6789 let excerpt_offset = self.excerpt_offset + overshoot;
6790 let excerpt_seek_dim = excerpt_offset;
6791 self.diff_transforms.seek(&excerpt_seek_dim, Bias::Right);
6792 if self.diff_transforms.start().excerpt_dimension > excerpt_offset {
6793 log::warn!(
6794 "Attempting to map a range from a buffer offset that starts before the current buffer offset"
6795 );
6796 return self.offset..self.offset;
6797 }
6798 let overshoot = excerpt_offset - self.diff_transforms.start().excerpt_dimension;
6799 let start = self.diff_transforms.start().output_dimension.0 + overshoot;
6800
6801 let end = if buffer_range.start < buffer_range.end {
6802 let overshoot = buffer_range.end - self.buffer_offset;
6803 let excerpt_offset = self.excerpt_offset + overshoot;
6804 let excerpt_seek_dim = excerpt_offset;
6805 self.diff_transforms
6806 .seek_forward(&excerpt_seek_dim, Bias::Right);
6807 let overshoot = excerpt_offset - self.diff_transforms.start().excerpt_dimension;
6808 // todo(lw): Clamp end to the excerpt boundaries
6809 self.diff_transforms.start().output_dimension.0 + overshoot
6810 } else {
6811 start
6812 };
6813
6814 start..end
6815 }
6816
6817 /// Returns true if the entirety of the given range is in the buffer's excerpt
6818 pub fn contains_buffer_range(&self, range: Range<BufferOffset>) -> bool {
6819 range.start >= self.excerpt.buffer_start_offset()
6820 && range.end <= self.excerpt.buffer_end_offset()
6821 }
6822
6823 pub fn max_buffer_row(&self) -> u32 {
6824 self.excerpt.max_buffer_row
6825 }
6826}
6827
6828impl ExcerptId {
6829 pub fn min() -> Self {
6830 Self(0)
6831 }
6832
6833 pub fn max() -> Self {
6834 Self(u32::MAX)
6835 }
6836
6837 pub fn to_proto(self) -> u64 {
6838 self.0 as _
6839 }
6840
6841 pub fn from_proto(proto: u64) -> Self {
6842 Self(proto as _)
6843 }
6844
6845 pub fn cmp(&self, other: &Self, snapshot: &MultiBufferSnapshot) -> cmp::Ordering {
6846 let a = snapshot.excerpt_locator_for_id(*self);
6847 let b = snapshot.excerpt_locator_for_id(*other);
6848 a.cmp(b).then_with(|| self.0.cmp(&other.0))
6849 }
6850}
6851
6852impl From<ExcerptId> for usize {
6853 fn from(val: ExcerptId) -> Self {
6854 val.0 as usize
6855 }
6856}
6857
6858impl fmt::Debug for Excerpt {
6859 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
6860 f.debug_struct("Excerpt")
6861 .field("id", &self.id)
6862 .field("locator", &self.locator)
6863 .field("buffer_id", &self.buffer_id)
6864 .field("range", &self.range)
6865 .field("text_summary", &self.text_summary)
6866 .field("has_trailing_newline", &self.has_trailing_newline)
6867 .finish()
6868 }
6869}
6870
6871impl sum_tree::Item for Excerpt {
6872 type Summary = ExcerptSummary;
6873
6874 fn summary(&self, _cx: ()) -> Self::Summary {
6875 let mut text = self.text_summary;
6876 if self.has_trailing_newline {
6877 text += TextSummary::from("\n");
6878 }
6879 ExcerptSummary {
6880 excerpt_id: self.id,
6881 excerpt_locator: self.locator.clone(),
6882 widest_line_number: self.max_buffer_row,
6883 text: text.into(),
6884 }
6885 }
6886}
6887
6888impl sum_tree::Item for ExcerptIdMapping {
6889 type Summary = ExcerptId;
6890
6891 fn summary(&self, _cx: ()) -> Self::Summary {
6892 self.id
6893 }
6894}
6895
6896impl sum_tree::KeyedItem for ExcerptIdMapping {
6897 type Key = ExcerptId;
6898
6899 fn key(&self) -> Self::Key {
6900 self.id
6901 }
6902}
6903
6904impl DiffTransform {
6905 fn hunk_info(&self) -> Option<DiffTransformHunkInfo> {
6906 match self {
6907 DiffTransform::DeletedHunk { hunk_info, .. } => Some(*hunk_info),
6908 DiffTransform::BufferContent {
6909 inserted_hunk_info, ..
6910 } => *inserted_hunk_info,
6911 }
6912 }
6913}
6914
6915impl sum_tree::Item for DiffTransform {
6916 type Summary = DiffTransformSummary;
6917
6918 fn summary(&self, _: <Self::Summary as sum_tree::Summary>::Context<'_>) -> Self::Summary {
6919 match self {
6920 DiffTransform::BufferContent { summary, .. } => DiffTransformSummary {
6921 input: *summary,
6922 output: *summary,
6923 },
6924 &DiffTransform::DeletedHunk { summary, .. } => DiffTransformSummary {
6925 input: MBTextSummary::default(),
6926 output: summary.into(),
6927 },
6928 }
6929 }
6930}
6931
6932impl DiffTransformSummary {
6933 fn excerpt_len(&self) -> ExcerptOffset {
6934 ExcerptDimension(self.input.len)
6935 }
6936}
6937
6938impl sum_tree::ContextLessSummary for DiffTransformSummary {
6939 fn zero() -> Self {
6940 DiffTransformSummary {
6941 input: MBTextSummary::default(),
6942 output: MBTextSummary::default(),
6943 }
6944 }
6945
6946 fn add_summary(&mut self, other: &Self) {
6947 self.input += other.input;
6948 self.output += other.output;
6949 }
6950}
6951
6952impl sum_tree::ContextLessSummary for ExcerptId {
6953 fn zero() -> Self {
6954 Self(0)
6955 }
6956
6957 fn add_summary(&mut self, summary: &Self) {
6958 *self = cmp::max(*self, *summary);
6959 }
6960}
6961
6962impl sum_tree::ContextLessSummary for ExcerptSummary {
6963 fn zero() -> Self {
6964 Self::default()
6965 }
6966
6967 fn add_summary(&mut self, summary: &Self) {
6968 debug_assert!(summary.excerpt_locator > self.excerpt_locator);
6969 self.excerpt_locator = summary.excerpt_locator.clone();
6970 self.text += summary.text;
6971 self.widest_line_number = cmp::max(self.widest_line_number, summary.widest_line_number);
6972 }
6973}
6974
6975impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, Option<&'a Locator>> for Locator {
6976 fn cmp(&self, cursor_location: &Option<&'a Locator>, _: ()) -> cmp::Ordering {
6977 Ord::cmp(&Some(self), cursor_location)
6978 }
6979}
6980
6981impl sum_tree::SeekTarget<'_, ExcerptSummary, ExcerptSummary> for Locator {
6982 fn cmp(&self, cursor_location: &ExcerptSummary, _: ()) -> cmp::Ordering {
6983 Ord::cmp(self, &cursor_location.excerpt_locator)
6984 }
6985}
6986
6987impl<'a, MBD> sum_tree::Dimension<'a, ExcerptSummary> for ExcerptDimension<MBD>
6988where
6989 MBD: MultiBufferDimension + Default,
6990{
6991 fn zero(_: ()) -> Self {
6992 ExcerptDimension(MBD::default())
6993 }
6994
6995 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: ()) {
6996 MultiBufferDimension::add_mb_text_summary(&mut self.0, &summary.text)
6997 }
6998}
6999
7000impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a Locator> {
7001 fn zero(_cx: ()) -> Self {
7002 Default::default()
7003 }
7004
7005 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: ()) {
7006 *self = Some(&summary.excerpt_locator);
7007 }
7008}
7009
7010impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<ExcerptId> {
7011 fn zero(_cx: ()) -> Self {
7012 Default::default()
7013 }
7014
7015 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: ()) {
7016 *self = Some(summary.excerpt_id);
7017 }
7018}
7019
7020#[derive(Copy, Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7021struct OutputDimension<T>(T);
7022
7023impl<T: PartialEq> PartialEq<T> for OutputDimension<T> {
7024 fn eq(&self, other: &T) -> bool {
7025 self.0 == *other
7026 }
7027}
7028
7029impl<T: PartialOrd> PartialOrd<T> for OutputDimension<T> {
7030 fn partial_cmp(&self, other: &T) -> Option<cmp::Ordering> {
7031 self.0.partial_cmp(other)
7032 }
7033}
7034
7035impl<R, T, U> ops::Sub<OutputDimension<U>> for OutputDimension<T>
7036where
7037 T: ops::Sub<U, Output = R>,
7038{
7039 type Output = R;
7040
7041 fn sub(self, other: OutputDimension<U>) -> Self::Output {
7042 self.0 - other.0
7043 }
7044}
7045
7046impl<R, T, U> ops::Add<U> for OutputDimension<T>
7047where
7048 T: ops::Add<U, Output = R>,
7049{
7050 type Output = OutputDimension<R>;
7051
7052 fn add(self, other: U) -> Self::Output {
7053 OutputDimension(self.0 + other)
7054 }
7055}
7056
7057impl<T, U> AddAssign<U> for OutputDimension<T>
7058where
7059 T: AddAssign<U>,
7060{
7061 fn add_assign(&mut self, other: U) {
7062 self.0 += other;
7063 }
7064}
7065
7066impl<T, U> SubAssign<U> for OutputDimension<T>
7067where
7068 T: SubAssign<U>,
7069{
7070 fn sub_assign(&mut self, other: U) {
7071 self.0 -= other;
7072 }
7073}
7074
7075#[derive(Copy, Clone, PartialOrd, Ord, Eq, PartialEq, Debug)]
7076struct ExcerptDimension<T>(T);
7077
7078impl<T: PartialEq> PartialEq<T> for ExcerptDimension<T> {
7079 fn eq(&self, other: &T) -> bool {
7080 self.0 == *other
7081 }
7082}
7083
7084impl<T: PartialOrd> PartialOrd<T> for ExcerptDimension<T> {
7085 fn partial_cmp(&self, other: &T) -> Option<cmp::Ordering> {
7086 self.0.partial_cmp(other)
7087 }
7088}
7089
7090impl ExcerptOffset {
7091 fn saturating_sub(self, other: ExcerptOffset) -> usize {
7092 self.0.saturating_sub(other.0)
7093 }
7094}
7095
7096impl<R, T, U> ops::Sub<ExcerptDimension<U>> for ExcerptDimension<T>
7097where
7098 T: ops::Sub<U, Output = R>,
7099{
7100 type Output = R;
7101
7102 fn sub(self, other: ExcerptDimension<U>) -> Self::Output {
7103 self.0 - other.0
7104 }
7105}
7106
7107impl<R, T, U> ops::Add<U> for ExcerptDimension<T>
7108where
7109 T: ops::Add<U, Output = R>,
7110{
7111 type Output = ExcerptDimension<R>;
7112
7113 fn add(self, other: U) -> Self::Output {
7114 ExcerptDimension(self.0 + other)
7115 }
7116}
7117
7118impl<T, U> AddAssign<U> for ExcerptDimension<T>
7119where
7120 T: AddAssign<U>,
7121{
7122 fn add_assign(&mut self, other: U) {
7123 self.0 += other;
7124 }
7125}
7126
7127impl<T, U> SubAssign<U> for ExcerptDimension<T>
7128where
7129 T: SubAssign<U>,
7130{
7131 fn sub_assign(&mut self, other: U) {
7132 self.0 -= other;
7133 }
7134}
7135
7136impl<'a> sum_tree::Dimension<'a, DiffTransformSummary> for MultiBufferOffset {
7137 fn zero(_: ()) -> Self {
7138 MultiBufferOffset::ZERO
7139 }
7140
7141 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: ()) {
7142 *self += summary.output.len;
7143 }
7144}
7145
7146impl<MBD> sum_tree::SeekTarget<'_, DiffTransformSummary, DiffTransformSummary>
7147 for ExcerptDimension<MBD>
7148where
7149 MBD: MultiBufferDimension + Ord,
7150{
7151 fn cmp(&self, cursor_location: &DiffTransformSummary, _: ()) -> cmp::Ordering {
7152 Ord::cmp(&self.0, &MBD::from_summary(&cursor_location.input))
7153 }
7154}
7155
7156impl<'a, MBD> sum_tree::SeekTarget<'a, DiffTransformSummary, DiffTransforms<MBD>>
7157 for ExcerptDimension<MBD>
7158where
7159 MBD: MultiBufferDimension + Ord,
7160{
7161 fn cmp(&self, cursor_location: &DiffTransforms<MBD>, _: ()) -> cmp::Ordering {
7162 Ord::cmp(&self.0, &cursor_location.excerpt_dimension.0)
7163 }
7164}
7165
7166impl<'a, MBD: MultiBufferDimension> sum_tree::Dimension<'a, DiffTransformSummary>
7167 for ExcerptDimension<MBD>
7168{
7169 fn zero(_: ()) -> Self {
7170 ExcerptDimension(MBD::default())
7171 }
7172
7173 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: ()) {
7174 self.0.add_mb_text_summary(&summary.input)
7175 }
7176}
7177
7178impl<'a, MBD> sum_tree::SeekTarget<'a, DiffTransformSummary, DiffTransforms<MBD>>
7179 for OutputDimension<MBD>
7180where
7181 MBD: MultiBufferDimension + Ord,
7182{
7183 fn cmp(&self, cursor_location: &DiffTransforms<MBD>, _: ()) -> cmp::Ordering {
7184 Ord::cmp(&self.0, &cursor_location.output_dimension.0)
7185 }
7186}
7187
7188impl<'a, MBD: MultiBufferDimension> sum_tree::Dimension<'a, DiffTransformSummary>
7189 for OutputDimension<MBD>
7190{
7191 fn zero(_: ()) -> Self {
7192 OutputDimension(MBD::default())
7193 }
7194
7195 fn add_summary(&mut self, summary: &'a DiffTransformSummary, _: ()) {
7196 self.0.add_mb_text_summary(&summary.output)
7197 }
7198}
7199
7200impl MultiBufferRows<'_> {
7201 pub fn seek(&mut self, MultiBufferRow(row): MultiBufferRow) {
7202 self.point = Point::new(row, 0);
7203 self.cursor.seek(&self.point);
7204 }
7205}
7206
7207impl Iterator for MultiBufferRows<'_> {
7208 type Item = RowInfo;
7209
7210 fn next(&mut self) -> Option<Self::Item> {
7211 if self.is_empty && self.point.row == 0 {
7212 self.point += Point::new(1, 0);
7213 return Some(RowInfo {
7214 buffer_id: None,
7215 buffer_row: Some(0),
7216 multibuffer_row: Some(MultiBufferRow(0)),
7217 diff_status: None,
7218 expand_info: None,
7219 wrapped_buffer_row: None,
7220 });
7221 }
7222
7223 let mut region = self.cursor.region()?;
7224 while self.point >= region.range.end {
7225 self.cursor.next();
7226 if let Some(next_region) = self.cursor.region() {
7227 region = next_region;
7228 } else if self.point == self.cursor.diff_transforms.end().output_dimension.0 {
7229 let multibuffer_row = MultiBufferRow(self.point.row);
7230 let last_excerpt = self
7231 .cursor
7232 .excerpts
7233 .item()
7234 .or(self.cursor.excerpts.prev_item())?;
7235 let last_row = last_excerpt
7236 .range
7237 .context
7238 .end
7239 .to_point(&last_excerpt.buffer)
7240 .row;
7241
7242 let first_row = last_excerpt
7243 .range
7244 .context
7245 .start
7246 .to_point(&last_excerpt.buffer)
7247 .row;
7248
7249 let expand_info = if self.is_singleton {
7250 None
7251 } else {
7252 let needs_expand_up = first_row == last_row
7253 && last_row > 0
7254 && !region.diff_hunk_status.is_some_and(|d| d.is_deleted());
7255 let needs_expand_down = last_row < last_excerpt.buffer.max_point().row;
7256
7257 if needs_expand_up && needs_expand_down {
7258 Some(ExpandExcerptDirection::UpAndDown)
7259 } else if needs_expand_up {
7260 Some(ExpandExcerptDirection::Up)
7261 } else if needs_expand_down {
7262 Some(ExpandExcerptDirection::Down)
7263 } else {
7264 None
7265 }
7266 .map(|direction| ExpandInfo {
7267 direction,
7268 excerpt_id: last_excerpt.id,
7269 })
7270 };
7271 self.point += Point::new(1, 0);
7272 return Some(RowInfo {
7273 buffer_id: Some(last_excerpt.buffer_id),
7274 buffer_row: Some(last_row),
7275 multibuffer_row: Some(multibuffer_row),
7276 diff_status: None,
7277 wrapped_buffer_row: None,
7278 expand_info,
7279 });
7280 } else {
7281 return None;
7282 };
7283 }
7284
7285 let overshoot = self.point - region.range.start;
7286 let buffer_point = region.buffer_range.start + overshoot;
7287 let expand_info = if self.is_singleton {
7288 None
7289 } else {
7290 let needs_expand_up = self.point.row == region.range.start.row
7291 && self.cursor.is_at_start_of_excerpt()
7292 && buffer_point.row > 0;
7293 let needs_expand_down = (region.excerpt.has_trailing_newline
7294 && self.point.row + 1 == region.range.end.row
7295 || !region.excerpt.has_trailing_newline && self.point.row == region.range.end.row)
7296 && self.cursor.is_at_end_of_excerpt()
7297 && buffer_point.row < region.buffer.max_point().row;
7298
7299 if needs_expand_up && needs_expand_down {
7300 Some(ExpandExcerptDirection::UpAndDown)
7301 } else if needs_expand_up {
7302 Some(ExpandExcerptDirection::Up)
7303 } else if needs_expand_down {
7304 Some(ExpandExcerptDirection::Down)
7305 } else {
7306 None
7307 }
7308 .map(|direction| ExpandInfo {
7309 direction,
7310 excerpt_id: region.excerpt.id,
7311 })
7312 };
7313
7314 let result = Some(RowInfo {
7315 buffer_id: Some(region.buffer.remote_id()),
7316 buffer_row: Some(buffer_point.row),
7317 multibuffer_row: Some(MultiBufferRow(self.point.row)),
7318 diff_status: region
7319 .diff_hunk_status
7320 .filter(|_| self.point < region.range.end),
7321 expand_info,
7322 wrapped_buffer_row: None,
7323 });
7324 self.point += Point::new(1, 0);
7325 result
7326 }
7327}
7328
7329impl<'a> MultiBufferChunks<'a> {
7330 pub fn offset(&self) -> MultiBufferOffset {
7331 self.range.start
7332 }
7333
7334 pub fn seek(&mut self, range: Range<MultiBufferOffset>) {
7335 self.diff_transforms.seek(&range.end, Bias::Right);
7336 let mut excerpt_end = self.diff_transforms.start().1;
7337 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7338 let overshoot = range.end - self.diff_transforms.start().0;
7339 excerpt_end += overshoot;
7340 }
7341
7342 self.diff_transforms.seek(&range.start, Bias::Right);
7343 let mut excerpt_start = self.diff_transforms.start().1;
7344 if let Some(DiffTransform::BufferContent { .. }) = self.diff_transforms.item() {
7345 let overshoot = range.start - self.diff_transforms.start().0;
7346 excerpt_start += overshoot;
7347 }
7348
7349 self.seek_to_excerpt_offset_range(excerpt_start..excerpt_end);
7350 self.buffer_chunk.take();
7351 self.range = range;
7352 }
7353
7354 fn seek_to_excerpt_offset_range(&mut self, new_range: Range<ExcerptOffset>) {
7355 self.excerpt_offset_range = new_range.clone();
7356 self.excerpts.seek(&new_range.start, Bias::Right);
7357 if let Some(excerpt) = self.excerpts.item() {
7358 let excerpt_start = *self.excerpts.start();
7359 if let Some(excerpt_chunks) = self
7360 .excerpt_chunks
7361 .as_mut()
7362 .filter(|chunks| excerpt.id == chunks.excerpt_id)
7363 {
7364 excerpt.seek_chunks(
7365 excerpt_chunks,
7366 (self.excerpt_offset_range.start - excerpt_start)
7367 ..(self.excerpt_offset_range.end - excerpt_start),
7368 );
7369 } else {
7370 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7371 (self.excerpt_offset_range.start - excerpt_start)
7372 ..(self.excerpt_offset_range.end - excerpt_start),
7373 self.language_aware,
7374 ));
7375 }
7376 } else {
7377 self.excerpt_chunks = None;
7378 }
7379 }
7380
7381 fn next_excerpt_chunk(&mut self) -> Option<Chunk<'a>> {
7382 loop {
7383 if self.excerpt_offset_range.is_empty() {
7384 return None;
7385 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
7386 self.excerpt_offset_range.start += chunk.text.len();
7387 return Some(chunk);
7388 } else {
7389 self.excerpts.next();
7390 let excerpt = self.excerpts.item()?;
7391 self.excerpt_chunks = Some(excerpt.chunks_in_range(
7392 0..(self.excerpt_offset_range.end - *self.excerpts.start()),
7393 self.language_aware,
7394 ));
7395 }
7396 }
7397 }
7398}
7399
7400impl<'a> Iterator for ReversedMultiBufferChunks<'a> {
7401 type Item = &'a str;
7402
7403 fn next(&mut self) -> Option<Self::Item> {
7404 let mut region = self.cursor.region()?;
7405 if self.offset == region.range.start {
7406 self.cursor.prev();
7407 region = self.cursor.region()?;
7408 let start_overshoot = self.start.saturating_sub(region.range.start);
7409 self.current_chunks = Some(region.buffer.reversed_chunks_in_range(
7410 region.buffer_range.start + start_overshoot..region.buffer_range.end,
7411 ));
7412 }
7413
7414 if self.offset == region.range.end && region.has_trailing_newline {
7415 self.offset -= 1;
7416 Some("\n")
7417 } else {
7418 let chunk = self.current_chunks.as_mut().unwrap().next()?;
7419 self.offset -= chunk.len();
7420 Some(chunk)
7421 }
7422 }
7423}
7424
7425impl<'a> Iterator for MultiBufferChunks<'a> {
7426 type Item = Chunk<'a>;
7427
7428 fn next(&mut self) -> Option<Chunk<'a>> {
7429 if self.range.start >= self.range.end {
7430 return None;
7431 }
7432 if self.range.start == self.diff_transforms.end().0 {
7433 self.diff_transforms.next();
7434 }
7435
7436 let diff_transform_start = self.diff_transforms.start().0;
7437 let diff_transform_end = self.diff_transforms.end().0;
7438 debug_assert!(
7439 self.range.start < diff_transform_end,
7440 "{:?} < {:?} of ({1:?}..{2:?})",
7441 self.range.start,
7442 diff_transform_end,
7443 diff_transform_start
7444 );
7445
7446 let diff_transform = self.diff_transforms.item()?;
7447 match diff_transform {
7448 DiffTransform::BufferContent { .. } => {
7449 let chunk = if let Some(chunk) = &mut self.buffer_chunk {
7450 chunk
7451 } else {
7452 let chunk = self.next_excerpt_chunk().unwrap();
7453 self.buffer_chunk.insert(chunk)
7454 };
7455
7456 let chunk_end = self.range.start + chunk.text.len();
7457 let diff_transform_end = diff_transform_end.min(self.range.end);
7458
7459 if diff_transform_end < chunk_end {
7460 let split_idx = diff_transform_end - self.range.start;
7461 let (before, after) = chunk.text.split_at(split_idx);
7462 self.range.start = diff_transform_end;
7463 let mask = 1u128.unbounded_shl(split_idx as u32).wrapping_sub(1);
7464 let chars = chunk.chars & mask;
7465 let tabs = chunk.tabs & mask;
7466
7467 chunk.text = after;
7468 chunk.chars = chunk.chars >> split_idx;
7469 chunk.tabs = chunk.tabs >> split_idx;
7470
7471 Some(Chunk {
7472 text: before,
7473 chars,
7474 tabs,
7475 ..chunk.clone()
7476 })
7477 } else {
7478 self.range.start = chunk_end;
7479 self.buffer_chunk.take()
7480 }
7481 }
7482 DiffTransform::DeletedHunk {
7483 buffer_id,
7484 base_text_byte_range,
7485 has_trailing_newline,
7486 ..
7487 } => {
7488 let base_text_start =
7489 base_text_byte_range.start + (self.range.start - diff_transform_start);
7490 let base_text_end =
7491 base_text_byte_range.start + (self.range.end - diff_transform_start);
7492 let base_text_end = base_text_end.min(base_text_byte_range.end);
7493
7494 let mut chunks = if let Some((_, mut chunks)) = self
7495 .diff_base_chunks
7496 .take()
7497 .filter(|(id, _)| id == buffer_id)
7498 {
7499 if chunks.range().start != base_text_start || chunks.range().end < base_text_end
7500 {
7501 chunks.seek(base_text_start..base_text_end);
7502 }
7503 chunks
7504 } else {
7505 let base_buffer = &self.diffs.get(buffer_id)?.base_text();
7506 base_buffer.chunks(base_text_start..base_text_end, self.language_aware)
7507 };
7508
7509 let chunk = if let Some(chunk) = chunks.next() {
7510 self.range.start += chunk.text.len();
7511 self.diff_base_chunks = Some((*buffer_id, chunks));
7512 chunk
7513 } else {
7514 debug_assert!(has_trailing_newline);
7515 self.range.start += "\n".len();
7516 Chunk {
7517 text: "\n",
7518 chars: 1u128,
7519 ..Default::default()
7520 }
7521 };
7522 Some(chunk)
7523 }
7524 }
7525 }
7526}
7527
7528impl MultiBufferBytes<'_> {
7529 fn consume(&mut self, len: usize) {
7530 self.range.start += len;
7531 self.chunk = &self.chunk[len..];
7532
7533 if !self.range.is_empty() && self.chunk.is_empty() {
7534 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
7535 self.chunk = chunk;
7536 } else if self.has_trailing_newline {
7537 self.has_trailing_newline = false;
7538 self.chunk = b"\n";
7539 } else {
7540 self.cursor.next();
7541 if let Some(region) = self.cursor.region() {
7542 let mut excerpt_bytes = region.buffer.bytes_in_range(
7543 region.buffer_range.start
7544 ..(region.buffer_range.start + (self.range.end - region.range.start))
7545 .min(region.buffer_range.end),
7546 );
7547 self.chunk = excerpt_bytes.next().unwrap_or(&[]);
7548 self.excerpt_bytes = Some(excerpt_bytes);
7549 self.has_trailing_newline =
7550 region.has_trailing_newline && self.range.end >= region.range.end;
7551 if self.chunk.is_empty() && self.has_trailing_newline {
7552 self.has_trailing_newline = false;
7553 self.chunk = b"\n";
7554 }
7555 }
7556 }
7557 }
7558 }
7559}
7560
7561impl<'a> Iterator for MultiBufferBytes<'a> {
7562 type Item = &'a [u8];
7563
7564 fn next(&mut self) -> Option<Self::Item> {
7565 let chunk = self.chunk;
7566 if chunk.is_empty() {
7567 None
7568 } else {
7569 self.consume(chunk.len());
7570 Some(chunk)
7571 }
7572 }
7573}
7574
7575impl io::Read for MultiBufferBytes<'_> {
7576 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
7577 let len = cmp::min(buf.len(), self.chunk.len());
7578 buf[..len].copy_from_slice(&self.chunk[..len]);
7579 if len > 0 {
7580 self.consume(len);
7581 }
7582 Ok(len)
7583 }
7584}
7585
7586impl io::Read for ReversedMultiBufferBytes<'_> {
7587 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
7588 let len = cmp::min(buf.len(), self.chunk.len());
7589 buf[..len].copy_from_slice(&self.chunk[..len]);
7590 buf[..len].reverse();
7591 if len > 0 {
7592 self.range.end -= len;
7593 self.chunk = &self.chunk[..self.chunk.len() - len];
7594 if !self.range.is_empty()
7595 && self.chunk.is_empty()
7596 && let Some(chunk) = self.chunks.next()
7597 {
7598 self.chunk = chunk.as_bytes();
7599 }
7600 }
7601 Ok(len)
7602 }
7603}
7604
7605impl<'a> Iterator for ExcerptChunks<'a> {
7606 type Item = Chunk<'a>;
7607
7608 fn next(&mut self) -> Option<Self::Item> {
7609 if let Some(chunk) = self.content_chunks.next() {
7610 return Some(chunk);
7611 }
7612
7613 if self.has_footer {
7614 let text = "\n";
7615 let chars = 0b1;
7616 self.has_footer = false;
7617 return Some(Chunk {
7618 text,
7619 chars,
7620 ..Default::default()
7621 });
7622 }
7623
7624 None
7625 }
7626}
7627
7628impl ToOffset for Point {
7629 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
7630 snapshot.point_to_offset(*self)
7631 }
7632 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
7633 snapshot.point_to_offset_utf16(*self)
7634 }
7635}
7636
7637impl ToOffset for MultiBufferOffset {
7638 #[track_caller]
7639 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
7640 assert!(
7641 *self <= snapshot.len(),
7642 "offset {} is greater than the snapshot.len() {}",
7643 self.0,
7644 snapshot.len().0,
7645 );
7646 *self
7647 }
7648 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
7649 snapshot.offset_to_offset_utf16(*self)
7650 }
7651}
7652
7653impl ToOffset for MultiBufferOffsetUtf16 {
7654 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
7655 snapshot.offset_utf16_to_offset(*self)
7656 }
7657
7658 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
7659 *self
7660 }
7661}
7662
7663impl ToOffset for PointUtf16 {
7664 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffset {
7665 snapshot.point_utf16_to_offset(*self)
7666 }
7667 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> MultiBufferOffsetUtf16 {
7668 snapshot.point_utf16_to_offset_utf16(*self)
7669 }
7670}
7671
7672impl ToPoint for MultiBufferOffset {
7673 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
7674 snapshot.offset_to_point(*self)
7675 }
7676 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
7677 snapshot.offset_to_point_utf16(*self)
7678 }
7679}
7680
7681impl ToPoint for Point {
7682 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
7683 *self
7684 }
7685 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
7686 snapshot.point_to_point_utf16(*self)
7687 }
7688}
7689
7690impl ToPoint for PointUtf16 {
7691 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
7692 snapshot.point_utf16_to_point(*self)
7693 }
7694 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
7695 *self
7696 }
7697}
7698
7699impl From<ExcerptId> for EntityId {
7700 fn from(id: ExcerptId) -> Self {
7701 EntityId::from(id.0 as u64)
7702 }
7703}
7704
7705#[cfg(debug_assertions)]
7706pub mod debug {
7707 use super::*;
7708
7709 pub trait ToMultiBufferDebugRanges {
7710 fn to_multi_buffer_debug_ranges(
7711 &self,
7712 snapshot: &MultiBufferSnapshot,
7713 ) -> Vec<Range<MultiBufferOffset>>;
7714 }
7715
7716 impl<T: ToOffset> ToMultiBufferDebugRanges for T {
7717 fn to_multi_buffer_debug_ranges(
7718 &self,
7719 snapshot: &MultiBufferSnapshot,
7720 ) -> Vec<Range<MultiBufferOffset>> {
7721 [self.to_offset(snapshot)].to_multi_buffer_debug_ranges(snapshot)
7722 }
7723 }
7724
7725 impl<T: ToOffset> ToMultiBufferDebugRanges for Range<T> {
7726 fn to_multi_buffer_debug_ranges(
7727 &self,
7728 snapshot: &MultiBufferSnapshot,
7729 ) -> Vec<Range<MultiBufferOffset>> {
7730 [self.start.to_offset(snapshot)..self.end.to_offset(snapshot)]
7731 .to_multi_buffer_debug_ranges(snapshot)
7732 }
7733 }
7734
7735 impl<T: ToOffset> ToMultiBufferDebugRanges for Vec<T> {
7736 fn to_multi_buffer_debug_ranges(
7737 &self,
7738 snapshot: &MultiBufferSnapshot,
7739 ) -> Vec<Range<MultiBufferOffset>> {
7740 self.as_slice().to_multi_buffer_debug_ranges(snapshot)
7741 }
7742 }
7743
7744 impl<T: ToOffset> ToMultiBufferDebugRanges for Vec<Range<T>> {
7745 fn to_multi_buffer_debug_ranges(
7746 &self,
7747 snapshot: &MultiBufferSnapshot,
7748 ) -> Vec<Range<MultiBufferOffset>> {
7749 self.as_slice().to_multi_buffer_debug_ranges(snapshot)
7750 }
7751 }
7752
7753 impl<T: ToOffset> ToMultiBufferDebugRanges for [T] {
7754 fn to_multi_buffer_debug_ranges(
7755 &self,
7756 snapshot: &MultiBufferSnapshot,
7757 ) -> Vec<Range<MultiBufferOffset>> {
7758 self.iter()
7759 .map(|item| {
7760 let offset = item.to_offset(snapshot);
7761 offset..offset
7762 })
7763 .collect()
7764 }
7765 }
7766
7767 impl<T: ToOffset> ToMultiBufferDebugRanges for [Range<T>] {
7768 fn to_multi_buffer_debug_ranges(
7769 &self,
7770 snapshot: &MultiBufferSnapshot,
7771 ) -> Vec<Range<MultiBufferOffset>> {
7772 self.iter()
7773 .map(|range| range.start.to_offset(snapshot)..range.end.to_offset(snapshot))
7774 .collect()
7775 }
7776 }
7777}