1use gpui::{AppContext, ModelHandle};
2use language::{
3 Anchor, AnchorRangeExt, Buffer, Chunk, HighlightId, Point, PointUtf16, TextSummary, ToOffset,
4};
5use parking_lot::Mutex;
6use std::{
7 cmp::{self, Ordering},
8 iter, mem,
9 ops::Range,
10 sync::atomic::{AtomicUsize, Ordering::SeqCst},
11};
12use sum_tree::{Bias, Cursor, FilterCursor, SumTree};
13
14pub trait ToFoldPoint {
15 fn to_fold_point(&self, snapshot: &Snapshot, bias: Bias) -> FoldPoint;
16}
17
18#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
19pub struct FoldPoint(pub super::Point);
20
21impl FoldPoint {
22 pub fn new(row: u32, column: u32) -> Self {
23 Self(super::Point::new(row, column))
24 }
25
26 pub fn row(self) -> u32 {
27 self.0.row
28 }
29
30 pub fn column(self) -> u32 {
31 self.0.column
32 }
33
34 pub fn row_mut(&mut self) -> &mut u32 {
35 &mut self.0.row
36 }
37
38 #[cfg(test)]
39 pub fn column_mut(&mut self) -> &mut u32 {
40 &mut self.0.column
41 }
42
43 pub fn to_buffer_point(&self, snapshot: &Snapshot) -> Point {
44 let mut cursor = snapshot.transforms.cursor::<(FoldPoint, Point)>();
45 cursor.seek(self, Bias::Right, &());
46 let overshoot = self.0 - cursor.start().0 .0;
47 cursor.start().1 + overshoot
48 }
49
50 pub fn to_buffer_offset(&self, snapshot: &Snapshot) -> usize {
51 let mut cursor = snapshot.transforms.cursor::<(FoldPoint, Point)>();
52 cursor.seek(self, Bias::Right, &());
53 let overshoot = self.0 - cursor.start().0 .0;
54 snapshot
55 .buffer_snapshot
56 .to_offset(cursor.start().1 + overshoot)
57 }
58
59 pub fn to_offset(&self, snapshot: &Snapshot) -> FoldOffset {
60 let mut cursor = snapshot
61 .transforms
62 .cursor::<(FoldPoint, TransformSummary)>();
63 cursor.seek(self, Bias::Right, &());
64 let overshoot = self.0 - cursor.start().1.output.lines;
65 let mut offset = cursor.start().1.output.bytes;
66 if !overshoot.is_zero() {
67 let transform = cursor.item().expect("display point out of range");
68 assert!(transform.output_text.is_none());
69 let end_buffer_offset = snapshot
70 .buffer_snapshot
71 .to_offset(cursor.start().1.input.lines + overshoot);
72 offset += end_buffer_offset - cursor.start().1.input.bytes;
73 }
74 FoldOffset(offset)
75 }
76}
77
78impl ToFoldPoint for Point {
79 fn to_fold_point(&self, snapshot: &Snapshot, bias: Bias) -> FoldPoint {
80 let mut cursor = snapshot.transforms.cursor::<(Point, FoldPoint)>();
81 cursor.seek(self, Bias::Right, &());
82 if cursor.item().map_or(false, |t| t.is_fold()) {
83 if bias == Bias::Left || *self == cursor.start().0 {
84 cursor.start().1
85 } else {
86 cursor.end(&()).1
87 }
88 } else {
89 let overshoot = *self - cursor.start().0;
90 FoldPoint(cmp::min(
91 cursor.start().1 .0 + overshoot,
92 cursor.end(&()).1 .0,
93 ))
94 }
95 }
96}
97
98pub struct FoldMapWriter<'a>(&'a mut FoldMap);
99
100impl<'a> FoldMapWriter<'a> {
101 pub fn fold<T: ToOffset>(
102 &mut self,
103 ranges: impl IntoIterator<Item = Range<T>>,
104 cx: &AppContext,
105 ) -> (Snapshot, Vec<FoldEdit>) {
106 let mut edits = Vec::new();
107 let mut folds = Vec::new();
108 let buffer = self.0.buffer.read(cx).snapshot();
109 for range in ranges.into_iter() {
110 let range = range.start.to_offset(&buffer)..range.end.to_offset(&buffer);
111 if range.start != range.end {
112 let fold = Fold(buffer.anchor_after(range.start)..buffer.anchor_before(range.end));
113 folds.push(fold);
114 edits.push(buffer::Edit {
115 old: range.clone(),
116 new: range,
117 });
118 }
119 }
120
121 folds.sort_unstable_by(|a, b| sum_tree::SeekTarget::cmp(a, b, &buffer));
122
123 self.0.folds = {
124 let mut new_tree = SumTree::new();
125 let mut cursor = self.0.folds.cursor::<Fold>();
126 for fold in folds {
127 new_tree.push_tree(cursor.slice(&fold, Bias::Right, &buffer), &buffer);
128 new_tree.push(fold, &buffer);
129 }
130 new_tree.push_tree(cursor.suffix(&buffer), &buffer);
131 new_tree
132 };
133
134 consolidate_buffer_edits(&mut edits);
135 let edits = self.0.apply_edits(edits, cx);
136 let snapshot = Snapshot {
137 transforms: self.0.transforms.lock().clone(),
138 folds: self.0.folds.clone(),
139 buffer_snapshot: self.0.buffer.read(cx).snapshot(),
140 version: self.0.version.load(SeqCst),
141 };
142 (snapshot, edits)
143 }
144
145 pub fn unfold<T: ToOffset>(
146 &mut self,
147 ranges: impl IntoIterator<Item = Range<T>>,
148 cx: &AppContext,
149 ) -> (Snapshot, Vec<FoldEdit>) {
150 let mut edits = Vec::new();
151 let mut fold_ixs_to_delete = Vec::new();
152 let buffer = self.0.buffer.read(cx).snapshot();
153 for range in ranges.into_iter() {
154 // Remove intersecting folds and add their ranges to edits that are passed to apply_edits.
155 let mut folds_cursor = intersecting_folds(&buffer, &self.0.folds, range, true);
156 while let Some(fold) = folds_cursor.item() {
157 let offset_range = fold.0.start.to_offset(&buffer)..fold.0.end.to_offset(&buffer);
158 edits.push(buffer::Edit {
159 old: offset_range.clone(),
160 new: offset_range,
161 });
162 fold_ixs_to_delete.push(*folds_cursor.start());
163 folds_cursor.next(&buffer);
164 }
165 }
166
167 fold_ixs_to_delete.sort_unstable();
168 fold_ixs_to_delete.dedup();
169
170 self.0.folds = {
171 let mut cursor = self.0.folds.cursor::<usize>();
172 let mut folds = SumTree::new();
173 for fold_ix in fold_ixs_to_delete {
174 folds.push_tree(cursor.slice(&fold_ix, Bias::Right, &buffer), &buffer);
175 cursor.next(&buffer);
176 }
177 folds.push_tree(cursor.suffix(&buffer), &buffer);
178 folds
179 };
180
181 consolidate_buffer_edits(&mut edits);
182 let edits = self.0.apply_edits(edits, cx);
183 let snapshot = Snapshot {
184 transforms: self.0.transforms.lock().clone(),
185 folds: self.0.folds.clone(),
186 buffer_snapshot: self.0.buffer.read(cx).snapshot(),
187 version: self.0.version.load(SeqCst),
188 };
189 (snapshot, edits)
190 }
191}
192
193pub struct FoldMap {
194 buffer: ModelHandle<Buffer>,
195 transforms: Mutex<SumTree<Transform>>,
196 folds: SumTree<Fold>,
197 last_sync: Mutex<SyncState>,
198 version: AtomicUsize,
199}
200
201#[derive(Clone)]
202struct SyncState {
203 version: clock::Global,
204 parse_count: usize,
205 diagnostics_update_count: usize,
206}
207
208impl FoldMap {
209 pub fn new(buffer_handle: ModelHandle<Buffer>, cx: &AppContext) -> (Self, Snapshot) {
210 let buffer = buffer_handle.read(cx);
211 let this = Self {
212 buffer: buffer_handle,
213 folds: Default::default(),
214 transforms: Mutex::new(SumTree::from_item(
215 Transform {
216 summary: TransformSummary {
217 input: buffer.text_summary(),
218 output: buffer.text_summary(),
219 },
220 output_text: None,
221 },
222 &(),
223 )),
224 last_sync: Mutex::new(SyncState {
225 version: buffer.version(),
226 parse_count: buffer.parse_count(),
227 diagnostics_update_count: buffer.diagnostics_update_count(),
228 }),
229 version: AtomicUsize::new(0),
230 };
231 let (snapshot, _) = this.read(cx);
232 (this, snapshot)
233 }
234
235 pub fn read(&self, cx: &AppContext) -> (Snapshot, Vec<FoldEdit>) {
236 let edits = self.sync(cx);
237 self.check_invariants(cx);
238 let snapshot = Snapshot {
239 transforms: self.transforms.lock().clone(),
240 folds: self.folds.clone(),
241 buffer_snapshot: self.buffer.read(cx).snapshot(),
242 version: self.version.load(SeqCst),
243 };
244 (snapshot, edits)
245 }
246
247 pub fn write(&mut self, cx: &AppContext) -> (FoldMapWriter, Snapshot, Vec<FoldEdit>) {
248 let (snapshot, edits) = self.read(cx);
249 (FoldMapWriter(self), snapshot, edits)
250 }
251
252 fn sync(&self, cx: &AppContext) -> Vec<FoldEdit> {
253 let buffer = self.buffer.read(cx);
254 let last_sync = mem::replace(
255 &mut *self.last_sync.lock(),
256 SyncState {
257 version: buffer.version(),
258 parse_count: buffer.parse_count(),
259 diagnostics_update_count: buffer.diagnostics_update_count(),
260 },
261 );
262 let edits = buffer
263 .edits_since(&last_sync.version)
264 .map(Into::into)
265 .collect::<Vec<_>>();
266 if edits.is_empty() {
267 if last_sync.parse_count != buffer.parse_count()
268 || last_sync.diagnostics_update_count != buffer.diagnostics_update_count()
269 {
270 self.version.fetch_add(1, SeqCst);
271 }
272 Vec::new()
273 } else {
274 self.apply_edits(edits, cx)
275 }
276 }
277
278 fn check_invariants(&self, cx: &AppContext) {
279 if cfg!(test) {
280 let buffer = self.buffer.read(cx);
281 assert_eq!(
282 self.transforms.lock().summary().input.bytes,
283 buffer.len(),
284 "transform tree does not match buffer's length"
285 );
286 }
287 }
288
289 fn apply_edits(
290 &self,
291 buffer_edits: Vec<buffer::Edit<usize>>,
292 cx: &AppContext,
293 ) -> Vec<FoldEdit> {
294 let buffer = self.buffer.read(cx).snapshot();
295 let mut buffer_edits_iter = buffer_edits.iter().cloned().peekable();
296
297 let mut new_transforms = SumTree::new();
298 let mut transforms = self.transforms.lock();
299 let mut cursor = transforms.cursor::<usize>();
300 cursor.seek(&0, Bias::Right, &());
301
302 while let Some(mut edit) = buffer_edits_iter.next() {
303 new_transforms.push_tree(cursor.slice(&edit.old.start, Bias::Left, &()), &());
304 edit.new.start -= edit.old.start - cursor.start();
305 edit.old.start = *cursor.start();
306
307 cursor.seek(&edit.old.end, Bias::Right, &());
308 cursor.next(&());
309
310 let mut delta = edit.new.len() as isize - edit.old.len() as isize;
311 loop {
312 edit.old.end = *cursor.start();
313
314 if let Some(next_edit) = buffer_edits_iter.peek() {
315 if next_edit.old.start > edit.old.end {
316 break;
317 }
318
319 let next_edit = buffer_edits_iter.next().unwrap();
320 delta += next_edit.new.len() as isize - next_edit.old.len() as isize;
321
322 if next_edit.old.end >= edit.old.end {
323 edit.old.end = next_edit.old.end;
324 cursor.seek(&edit.old.end, Bias::Right, &());
325 cursor.next(&());
326 }
327 } else {
328 break;
329 }
330 }
331
332 edit.new.end = ((edit.new.start + edit.old.len()) as isize + delta) as usize;
333
334 let anchor = buffer.anchor_before(edit.new.start);
335 let mut folds_cursor = self.folds.cursor::<Fold>();
336 folds_cursor.seek(&Fold(anchor..Anchor::max()), Bias::Left, &buffer);
337
338 let mut folds = iter::from_fn({
339 let buffer = &buffer;
340 move || {
341 let item = folds_cursor
342 .item()
343 .map(|f| f.0.start.to_offset(buffer)..f.0.end.to_offset(buffer));
344 folds_cursor.next(buffer);
345 item
346 }
347 })
348 .peekable();
349
350 while folds.peek().map_or(false, |fold| fold.start < edit.new.end) {
351 let mut fold = folds.next().unwrap();
352 let sum = new_transforms.summary();
353
354 assert!(fold.start >= sum.input.bytes);
355
356 while folds
357 .peek()
358 .map_or(false, |next_fold| next_fold.start <= fold.end)
359 {
360 let next_fold = folds.next().unwrap();
361 if next_fold.end > fold.end {
362 fold.end = next_fold.end;
363 }
364 }
365
366 if fold.start > sum.input.bytes {
367 let text_summary = buffer.text_summary_for_range(sum.input.bytes..fold.start);
368 new_transforms.push(
369 Transform {
370 summary: TransformSummary {
371 output: text_summary.clone(),
372 input: text_summary,
373 },
374 output_text: None,
375 },
376 &(),
377 );
378 }
379
380 if fold.end > fold.start {
381 let output_text = "…";
382 let chars = output_text.chars().count() as u32;
383 let lines = Point::new(0, output_text.len() as u32);
384 let lines_utf16 = PointUtf16::new(0, output_text.encode_utf16().count() as u32);
385 new_transforms.push(
386 Transform {
387 summary: TransformSummary {
388 output: TextSummary {
389 bytes: output_text.len(),
390 lines,
391 lines_utf16,
392 first_line_chars: chars,
393 last_line_chars: chars,
394 longest_row: 0,
395 longest_row_chars: chars,
396 },
397 input: buffer.text_summary_for_range(fold.start..fold.end),
398 },
399 output_text: Some(output_text),
400 },
401 &(),
402 );
403 }
404 }
405
406 let sum = new_transforms.summary();
407 if sum.input.bytes < edit.new.end {
408 let text_summary = buffer.text_summary_for_range(sum.input.bytes..edit.new.end);
409 new_transforms.push(
410 Transform {
411 summary: TransformSummary {
412 output: text_summary.clone(),
413 input: text_summary,
414 },
415 output_text: None,
416 },
417 &(),
418 );
419 }
420 }
421
422 new_transforms.push_tree(cursor.suffix(&()), &());
423 if new_transforms.is_empty() {
424 let text_summary = buffer.text_summary();
425 new_transforms.push(
426 Transform {
427 summary: TransformSummary {
428 output: text_summary.clone(),
429 input: text_summary,
430 },
431 output_text: None,
432 },
433 &(),
434 );
435 }
436
437 drop(cursor);
438
439 let mut fold_edits = Vec::with_capacity(buffer_edits.len());
440 {
441 let mut old_transforms = transforms.cursor::<(usize, FoldOffset)>();
442 let mut new_transforms = new_transforms.cursor::<(usize, FoldOffset)>();
443
444 for mut edit in buffer_edits {
445 old_transforms.seek(&edit.old.start, Bias::Left, &());
446 if old_transforms.item().map_or(false, |t| t.is_fold()) {
447 edit.old.start = old_transforms.start().0;
448 }
449 let old_start =
450 old_transforms.start().1 .0 + (edit.old.start - old_transforms.start().0);
451
452 old_transforms.seek_forward(&edit.old.end, Bias::Right, &());
453 if old_transforms.item().map_or(false, |t| t.is_fold()) {
454 old_transforms.next(&());
455 edit.old.end = old_transforms.start().0;
456 }
457 let old_end =
458 old_transforms.start().1 .0 + (edit.old.end - old_transforms.start().0);
459
460 new_transforms.seek(&edit.new.start, Bias::Left, &());
461 if new_transforms.item().map_or(false, |t| t.is_fold()) {
462 edit.new.start = new_transforms.start().0;
463 }
464 let new_start =
465 new_transforms.start().1 .0 + (edit.new.start - new_transforms.start().0);
466
467 new_transforms.seek_forward(&edit.new.end, Bias::Right, &());
468 if new_transforms.item().map_or(false, |t| t.is_fold()) {
469 new_transforms.next(&());
470 edit.new.end = new_transforms.start().0;
471 }
472 let new_end =
473 new_transforms.start().1 .0 + (edit.new.end - new_transforms.start().0);
474
475 fold_edits.push(FoldEdit {
476 old_bytes: FoldOffset(old_start)..FoldOffset(old_end),
477 new_bytes: FoldOffset(new_start)..FoldOffset(new_end),
478 });
479 }
480
481 consolidate_fold_edits(&mut fold_edits);
482 }
483
484 *transforms = new_transforms;
485 self.version.fetch_add(1, SeqCst);
486 fold_edits
487 }
488}
489
490#[derive(Clone)]
491pub struct Snapshot {
492 transforms: SumTree<Transform>,
493 folds: SumTree<Fold>,
494 buffer_snapshot: language::Snapshot,
495 pub version: usize,
496}
497
498impl Snapshot {
499 #[cfg(test)]
500 pub fn text(&self) -> String {
501 self.chunks(FoldOffset(0)..self.len(), false)
502 .map(|c| c.text)
503 .collect()
504 }
505
506 #[cfg(test)]
507 pub fn fold_count(&self) -> usize {
508 self.folds.items(&self.buffer_snapshot).len()
509 }
510
511 pub fn text_summary_for_range(&self, range: Range<FoldPoint>) -> TextSummary {
512 let mut summary = TextSummary::default();
513
514 let mut cursor = self.transforms.cursor::<(FoldPoint, Point)>();
515 cursor.seek(&range.start, Bias::Right, &());
516 if let Some(transform) = cursor.item() {
517 let start_in_transform = range.start.0 - cursor.start().0 .0;
518 let end_in_transform = cmp::min(range.end, cursor.end(&()).0).0 - cursor.start().0 .0;
519 if let Some(output_text) = transform.output_text {
520 summary = TextSummary::from(
521 &output_text
522 [start_in_transform.column as usize..end_in_transform.column as usize],
523 );
524 } else {
525 let buffer_start = cursor.start().1 + start_in_transform;
526 let buffer_end = cursor.start().1 + end_in_transform;
527 summary = self
528 .buffer_snapshot
529 .text_summary_for_range(buffer_start..buffer_end);
530 }
531 }
532
533 if range.end > cursor.end(&()).0 {
534 cursor.next(&());
535 summary += &cursor
536 .summary::<_, TransformSummary>(&range.end, Bias::Right, &())
537 .output;
538 if let Some(transform) = cursor.item() {
539 let end_in_transform = range.end.0 - cursor.start().0 .0;
540 if let Some(output_text) = transform.output_text {
541 summary += TextSummary::from(&output_text[..end_in_transform.column as usize]);
542 } else {
543 let buffer_start = cursor.start().1;
544 let buffer_end = cursor.start().1 + end_in_transform;
545 summary += self
546 .buffer_snapshot
547 .text_summary_for_range(buffer_start..buffer_end);
548 }
549 }
550 }
551
552 summary
553 }
554
555 pub fn len(&self) -> FoldOffset {
556 FoldOffset(self.transforms.summary().output.bytes)
557 }
558
559 #[cfg(test)]
560 pub fn line_len(&self, row: u32) -> u32 {
561 let line_start = FoldPoint::new(row, 0).to_offset(self).0;
562 let line_end = if row >= self.max_point().row() {
563 self.len().0
564 } else {
565 FoldPoint::new(row + 1, 0).to_offset(self).0 - 1
566 };
567 (line_end - line_start) as u32
568 }
569
570 pub fn buffer_rows(&self, start_row: u32) -> BufferRows {
571 if start_row > self.transforms.summary().output.lines.row {
572 panic!("invalid display row {}", start_row);
573 }
574
575 let fold_point = FoldPoint::new(start_row, 0);
576 let mut cursor = self.transforms.cursor();
577 cursor.seek(&fold_point, Bias::Left, &());
578 BufferRows { fold_point, cursor }
579 }
580
581 pub fn max_point(&self) -> FoldPoint {
582 FoldPoint(self.transforms.summary().output.lines)
583 }
584
585 #[cfg(test)]
586 pub fn longest_row(&self) -> u32 {
587 self.transforms.summary().output.longest_row
588 }
589
590 pub fn folds_in_range<'a, T>(
591 &'a self,
592 range: Range<T>,
593 ) -> impl Iterator<Item = &'a Range<Anchor>>
594 where
595 T: ToOffset,
596 {
597 let mut folds = intersecting_folds(&self.buffer_snapshot, &self.folds, range, false);
598 iter::from_fn(move || {
599 let item = folds.item().map(|f| &f.0);
600 folds.next(&self.buffer_snapshot);
601 item
602 })
603 }
604
605 pub fn intersects_fold<T>(&self, offset: T) -> bool
606 where
607 T: ToOffset,
608 {
609 let offset = offset.to_offset(&self.buffer_snapshot);
610 let mut cursor = self.transforms.cursor::<usize>();
611 cursor.seek(&offset, Bias::Right, &());
612 cursor.item().map_or(false, |t| t.output_text.is_some())
613 }
614
615 pub fn is_line_folded(&self, output_row: u32) -> bool {
616 let mut cursor = self.transforms.cursor::<FoldPoint>();
617 cursor.seek(&FoldPoint::new(output_row, 0), Bias::Right, &());
618 while let Some(transform) = cursor.item() {
619 if transform.output_text.is_some() {
620 return true;
621 }
622 if cursor.end(&()).row() == output_row {
623 cursor.next(&())
624 } else {
625 break;
626 }
627 }
628 false
629 }
630
631 pub fn chars_at(&self, start: FoldPoint) -> impl '_ + Iterator<Item = char> {
632 let start = start.to_offset(self);
633 self.chunks(start..self.len(), false)
634 .flat_map(|chunk| chunk.text.chars())
635 }
636
637 pub fn chunks(&self, range: Range<FoldOffset>, enable_highlights: bool) -> Chunks {
638 let mut transform_cursor = self.transforms.cursor::<(FoldOffset, usize)>();
639
640 transform_cursor.seek(&range.end, Bias::Right, &());
641 let overshoot = range.end.0 - transform_cursor.start().0 .0;
642 let buffer_end = transform_cursor.start().1 + overshoot;
643
644 transform_cursor.seek(&range.start, Bias::Right, &());
645 let overshoot = range.start.0 - transform_cursor.start().0 .0;
646 let buffer_start = transform_cursor.start().1 + overshoot;
647
648 Chunks {
649 transform_cursor,
650 buffer_chunks: self
651 .buffer_snapshot
652 .chunks(buffer_start..buffer_end, enable_highlights),
653 buffer_chunk: None,
654 buffer_offset: buffer_start,
655 output_offset: range.start.0,
656 max_output_offset: range.end.0,
657 }
658 }
659
660 #[cfg(test)]
661 pub fn clip_offset(&self, offset: FoldOffset, bias: Bias) -> FoldOffset {
662 let mut cursor = self.transforms.cursor::<(FoldOffset, usize)>();
663 cursor.seek(&offset, Bias::Right, &());
664 if let Some(transform) = cursor.item() {
665 let transform_start = cursor.start().0 .0;
666 if transform.output_text.is_some() {
667 if offset.0 == transform_start || matches!(bias, Bias::Left) {
668 FoldOffset(transform_start)
669 } else {
670 FoldOffset(cursor.end(&()).0 .0)
671 }
672 } else {
673 let overshoot = offset.0 - transform_start;
674 let buffer_offset = cursor.start().1 + overshoot;
675 let clipped_buffer_offset = self.buffer_snapshot.clip_offset(buffer_offset, bias);
676 FoldOffset(
677 (offset.0 as isize + (clipped_buffer_offset as isize - buffer_offset as isize))
678 as usize,
679 )
680 }
681 } else {
682 FoldOffset(self.transforms.summary().output.bytes)
683 }
684 }
685
686 pub fn clip_point(&self, point: FoldPoint, bias: Bias) -> FoldPoint {
687 let mut cursor = self.transforms.cursor::<(FoldPoint, Point)>();
688 cursor.seek(&point, Bias::Right, &());
689 if let Some(transform) = cursor.item() {
690 let transform_start = cursor.start().0 .0;
691 if transform.output_text.is_some() {
692 if point.0 == transform_start || matches!(bias, Bias::Left) {
693 FoldPoint(transform_start)
694 } else {
695 FoldPoint(cursor.end(&()).0 .0)
696 }
697 } else {
698 let overshoot = point.0 - transform_start;
699 let buffer_position = cursor.start().1 + overshoot;
700 let clipped_buffer_position =
701 self.buffer_snapshot.clip_point(buffer_position, bias);
702 FoldPoint::new(
703 point.row(),
704 ((point.column() as i32) + clipped_buffer_position.column as i32
705 - buffer_position.column as i32) as u32,
706 )
707 }
708 } else {
709 FoldPoint(self.transforms.summary().output.lines)
710 }
711 }
712}
713
714fn intersecting_folds<'a, T>(
715 buffer: &'a buffer::Snapshot,
716 folds: &'a SumTree<Fold>,
717 range: Range<T>,
718 inclusive: bool,
719) -> FilterCursor<'a, impl 'a + FnMut(&FoldSummary) -> bool, Fold, usize>
720where
721 T: ToOffset,
722{
723 let start = buffer.anchor_before(range.start.to_offset(buffer));
724 let end = buffer.anchor_after(range.end.to_offset(buffer));
725 folds.filter::<_, usize>(
726 move |summary| {
727 let start_cmp = start.cmp(&summary.max_end, buffer).unwrap();
728 let end_cmp = end.cmp(&summary.min_start, buffer).unwrap();
729
730 if inclusive {
731 start_cmp <= Ordering::Equal && end_cmp >= Ordering::Equal
732 } else {
733 start_cmp == Ordering::Less && end_cmp == Ordering::Greater
734 }
735 },
736 buffer,
737 )
738}
739
740fn consolidate_buffer_edits(edits: &mut Vec<buffer::Edit<usize>>) {
741 edits.sort_unstable_by(|a, b| {
742 a.old
743 .start
744 .cmp(&b.old.start)
745 .then_with(|| b.old.end.cmp(&a.old.end))
746 });
747
748 let mut i = 1;
749 while i < edits.len() {
750 let edit = edits[i].clone();
751 let prev_edit = &mut edits[i - 1];
752 if prev_edit.old.end >= edit.old.start {
753 prev_edit.old.end = prev_edit.old.end.max(edit.old.end);
754 prev_edit.new.start = prev_edit.new.start.min(edit.new.start);
755 prev_edit.new.end = prev_edit.new.end.max(edit.new.end);
756 edits.remove(i);
757 continue;
758 }
759 i += 1;
760 }
761}
762
763fn consolidate_fold_edits(edits: &mut Vec<FoldEdit>) {
764 edits.sort_unstable_by(|a, b| {
765 a.old_bytes
766 .start
767 .cmp(&b.old_bytes.start)
768 .then_with(|| b.old_bytes.end.cmp(&a.old_bytes.end))
769 });
770
771 let mut i = 1;
772 while i < edits.len() {
773 let edit = edits[i].clone();
774 let prev_edit = &mut edits[i - 1];
775 if prev_edit.old_bytes.end >= edit.old_bytes.start {
776 prev_edit.old_bytes.end = prev_edit.old_bytes.end.max(edit.old_bytes.end);
777 prev_edit.new_bytes.start = prev_edit.new_bytes.start.min(edit.new_bytes.start);
778 prev_edit.new_bytes.end = prev_edit.new_bytes.end.max(edit.new_bytes.end);
779 edits.remove(i);
780 continue;
781 }
782 i += 1;
783 }
784}
785
786#[derive(Clone, Debug, Default, Eq, PartialEq)]
787struct Transform {
788 summary: TransformSummary,
789 output_text: Option<&'static str>,
790}
791
792impl Transform {
793 fn is_fold(&self) -> bool {
794 self.output_text.is_some()
795 }
796}
797
798#[derive(Clone, Debug, Default, Eq, PartialEq)]
799struct TransformSummary {
800 output: TextSummary,
801 input: TextSummary,
802}
803
804impl sum_tree::Item for Transform {
805 type Summary = TransformSummary;
806
807 fn summary(&self) -> Self::Summary {
808 self.summary.clone()
809 }
810}
811
812impl sum_tree::Summary for TransformSummary {
813 type Context = ();
814
815 fn add_summary(&mut self, other: &Self, _: &()) {
816 self.input += &other.input;
817 self.output += &other.output;
818 }
819}
820
821#[derive(Clone, Debug)]
822struct Fold(Range<Anchor>);
823
824impl Default for Fold {
825 fn default() -> Self {
826 Self(Anchor::min()..Anchor::max())
827 }
828}
829
830impl sum_tree::Item for Fold {
831 type Summary = FoldSummary;
832
833 fn summary(&self) -> Self::Summary {
834 FoldSummary {
835 start: self.0.start.clone(),
836 end: self.0.end.clone(),
837 min_start: self.0.start.clone(),
838 max_end: self.0.end.clone(),
839 count: 1,
840 }
841 }
842}
843
844#[derive(Clone, Debug)]
845struct FoldSummary {
846 start: Anchor,
847 end: Anchor,
848 min_start: Anchor,
849 max_end: Anchor,
850 count: usize,
851}
852
853impl Default for FoldSummary {
854 fn default() -> Self {
855 Self {
856 start: Anchor::min(),
857 end: Anchor::max(),
858 min_start: Anchor::max(),
859 max_end: Anchor::min(),
860 count: 0,
861 }
862 }
863}
864
865impl sum_tree::Summary for FoldSummary {
866 type Context = buffer::Snapshot;
867
868 fn add_summary(&mut self, other: &Self, buffer: &buffer::Snapshot) {
869 if other.min_start.cmp(&self.min_start, buffer).unwrap() == Ordering::Less {
870 self.min_start = other.min_start.clone();
871 }
872 if other.max_end.cmp(&self.max_end, buffer).unwrap() == Ordering::Greater {
873 self.max_end = other.max_end.clone();
874 }
875
876 #[cfg(debug_assertions)]
877 {
878 let start_comparison = self.start.cmp(&other.start, buffer).unwrap();
879 assert!(start_comparison <= Ordering::Equal);
880 if start_comparison == Ordering::Equal {
881 assert!(self.end.cmp(&other.end, buffer).unwrap() >= Ordering::Equal);
882 }
883 }
884
885 self.start = other.start.clone();
886 self.end = other.end.clone();
887 self.count += other.count;
888 }
889}
890
891impl<'a> sum_tree::Dimension<'a, FoldSummary> for Fold {
892 fn add_summary(&mut self, summary: &'a FoldSummary, _: &buffer::Snapshot) {
893 self.0.start = summary.start.clone();
894 self.0.end = summary.end.clone();
895 }
896}
897
898impl<'a> sum_tree::SeekTarget<'a, FoldSummary, Fold> for Fold {
899 fn cmp(&self, other: &Self, buffer: &buffer::Snapshot) -> Ordering {
900 self.0.cmp(&other.0, buffer).unwrap()
901 }
902}
903
904impl<'a> sum_tree::Dimension<'a, FoldSummary> for usize {
905 fn add_summary(&mut self, summary: &'a FoldSummary, _: &buffer::Snapshot) {
906 *self += summary.count;
907 }
908}
909
910pub struct BufferRows<'a> {
911 cursor: Cursor<'a, Transform, (FoldPoint, Point)>,
912 fold_point: FoldPoint,
913}
914
915impl<'a> Iterator for BufferRows<'a> {
916 type Item = u32;
917
918 fn next(&mut self) -> Option<Self::Item> {
919 while self.fold_point > self.cursor.end(&()).0 {
920 self.cursor.next(&());
921 if self.cursor.item().is_none() {
922 // TODO: Return a bool from next?
923 break;
924 }
925 }
926
927 if self.cursor.item().is_some() {
928 let overshoot = self.fold_point.0 - self.cursor.start().0 .0;
929 let buffer_point = self.cursor.start().1 + overshoot;
930 *self.fold_point.row_mut() += 1;
931 Some(buffer_point.row)
932 } else {
933 None
934 }
935 }
936}
937
938pub struct Chunks<'a> {
939 transform_cursor: Cursor<'a, Transform, (FoldOffset, usize)>,
940 buffer_chunks: language::Chunks<'a>,
941 buffer_chunk: Option<(usize, Chunk<'a>)>,
942 buffer_offset: usize,
943 output_offset: usize,
944 max_output_offset: usize,
945}
946
947impl<'a> Iterator for Chunks<'a> {
948 type Item = Chunk<'a>;
949
950 fn next(&mut self) -> Option<Self::Item> {
951 if self.output_offset >= self.max_output_offset {
952 return None;
953 }
954
955 let transform = if let Some(item) = self.transform_cursor.item() {
956 item
957 } else {
958 return None;
959 };
960
961 // If we're in a fold, then return the fold's display text and
962 // advance the transform and buffer cursors to the end of the fold.
963 if let Some(output_text) = transform.output_text {
964 self.buffer_chunk.take();
965 self.buffer_offset += transform.summary.input.bytes;
966 self.buffer_chunks.seek(self.buffer_offset);
967
968 while self.buffer_offset >= self.transform_cursor.end(&()).1
969 && self.transform_cursor.item().is_some()
970 {
971 self.transform_cursor.next(&());
972 }
973
974 self.output_offset += output_text.len();
975 return Some(Chunk {
976 text: output_text,
977 highlight_id: HighlightId::default(),
978 diagnostic: None,
979 });
980 }
981
982 // Retrieve a chunk from the current location in the buffer.
983 if self.buffer_chunk.is_none() {
984 let chunk_offset = self.buffer_chunks.offset();
985 self.buffer_chunk = self.buffer_chunks.next().map(|chunk| (chunk_offset, chunk));
986 }
987
988 // Otherwise, take a chunk from the buffer's text.
989 if let Some((chunk_offset, mut chunk)) = self.buffer_chunk {
990 let offset_in_chunk = self.buffer_offset - chunk_offset;
991 chunk.text = &chunk.text[offset_in_chunk..];
992
993 // Truncate the chunk so that it ends at the next fold.
994 let region_end = self.transform_cursor.end(&()).1 - self.buffer_offset;
995 if chunk.text.len() >= region_end {
996 chunk.text = &chunk.text[0..region_end];
997 self.transform_cursor.next(&());
998 } else {
999 self.buffer_chunk.take();
1000 }
1001
1002 self.buffer_offset += chunk.text.len();
1003 self.output_offset += chunk.text.len();
1004 return Some(chunk);
1005 }
1006
1007 None
1008 }
1009}
1010
1011impl<'a> sum_tree::Dimension<'a, TransformSummary> for FoldPoint {
1012 fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1013 self.0 += &summary.output.lines;
1014 }
1015}
1016
1017#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
1018pub struct FoldOffset(pub usize);
1019
1020impl FoldOffset {
1021 pub fn to_point(&self, snapshot: &Snapshot) -> FoldPoint {
1022 let mut cursor = snapshot
1023 .transforms
1024 .cursor::<(FoldOffset, TransformSummary)>();
1025 cursor.seek(self, Bias::Right, &());
1026 let overshoot = if cursor.item().map_or(true, |t| t.is_fold()) {
1027 Point::new(0, (self.0 - cursor.start().0 .0) as u32)
1028 } else {
1029 let buffer_offset = cursor.start().1.input.bytes + self.0 - cursor.start().0 .0;
1030 let buffer_point = snapshot.buffer_snapshot.to_point(buffer_offset);
1031 buffer_point - cursor.start().1.input.lines
1032 };
1033 FoldPoint(cursor.start().1.output.lines + overshoot)
1034 }
1035}
1036
1037impl<'a> sum_tree::Dimension<'a, TransformSummary> for FoldOffset {
1038 fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1039 self.0 += &summary.output.bytes;
1040 }
1041}
1042
1043impl<'a> sum_tree::Dimension<'a, TransformSummary> for Point {
1044 fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1045 *self += &summary.input.lines;
1046 }
1047}
1048
1049impl<'a> sum_tree::Dimension<'a, TransformSummary> for usize {
1050 fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1051 *self += &summary.input.bytes;
1052 }
1053}
1054
1055#[derive(Clone, Debug, PartialEq, Eq)]
1056pub struct FoldEdit {
1057 pub old_bytes: Range<FoldOffset>,
1058 pub new_bytes: Range<FoldOffset>,
1059}
1060
1061#[cfg(test)]
1062impl FoldEdit {
1063 pub fn delta(&self) -> isize {
1064 self.inserted_bytes() as isize - self.deleted_bytes() as isize
1065 }
1066
1067 pub fn deleted_bytes(&self) -> usize {
1068 self.old_bytes.end.0 - self.old_bytes.start.0
1069 }
1070
1071 pub fn inserted_bytes(&self) -> usize {
1072 self.new_bytes.end.0 - self.new_bytes.start.0
1073 }
1074}
1075
1076#[cfg(test)]
1077mod tests {
1078 use super::*;
1079 use crate::{test::sample_text, ToPoint};
1080 use buffer::RandomCharIter;
1081 use rand::prelude::*;
1082 use std::{env, mem};
1083 use Bias::{Left, Right};
1084
1085 #[gpui::test]
1086 fn test_basic_folds(cx: &mut gpui::MutableAppContext) {
1087 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(5, 6), cx));
1088 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1089
1090 let (mut writer, _, _) = map.write(cx.as_ref());
1091 let (snapshot2, edits) = writer.fold(
1092 vec![
1093 Point::new(0, 2)..Point::new(2, 2),
1094 Point::new(2, 4)..Point::new(4, 1),
1095 ],
1096 cx.as_ref(),
1097 );
1098 assert_eq!(snapshot2.text(), "aa…cc…eeeee");
1099 assert_eq!(
1100 edits,
1101 &[
1102 FoldEdit {
1103 old_bytes: FoldOffset(2)..FoldOffset(16),
1104 new_bytes: FoldOffset(2)..FoldOffset(5),
1105 },
1106 FoldEdit {
1107 old_bytes: FoldOffset(18)..FoldOffset(29),
1108 new_bytes: FoldOffset(7)..FoldOffset(10)
1109 },
1110 ]
1111 );
1112
1113 buffer.update(cx, |buffer, cx| {
1114 buffer.edit(
1115 vec![
1116 Point::new(0, 0)..Point::new(0, 1),
1117 Point::new(2, 3)..Point::new(2, 3),
1118 ],
1119 "123",
1120 cx,
1121 );
1122 });
1123 let (snapshot3, edits) = map.read(cx.as_ref());
1124 assert_eq!(snapshot3.text(), "123a…c123c…eeeee");
1125 assert_eq!(
1126 edits,
1127 &[
1128 FoldEdit {
1129 old_bytes: FoldOffset(0)..FoldOffset(1),
1130 new_bytes: FoldOffset(0)..FoldOffset(3),
1131 },
1132 FoldEdit {
1133 old_bytes: FoldOffset(6)..FoldOffset(6),
1134 new_bytes: FoldOffset(8)..FoldOffset(11),
1135 },
1136 ]
1137 );
1138
1139 buffer.update(cx, |buffer, cx| {
1140 buffer.edit(vec![Point::new(2, 6)..Point::new(4, 3)], "456", cx)
1141 });
1142 let (snapshot4, _) = map.read(cx.as_ref());
1143 assert_eq!(snapshot4.text(), "123a…c123456eee");
1144
1145 let (mut writer, _, _) = map.write(cx.as_ref());
1146 writer.unfold(Some(Point::new(0, 4)..Point::new(0, 5)), cx.as_ref());
1147 let (snapshot5, _) = map.read(cx.as_ref());
1148 assert_eq!(snapshot5.text(), "123aaaaa\nbbbbbb\nccc123456eee");
1149 }
1150
1151 #[gpui::test]
1152 fn test_adjacent_folds(cx: &mut gpui::MutableAppContext) {
1153 let buffer = cx.add_model(|cx| Buffer::new(0, "abcdefghijkl", cx));
1154
1155 {
1156 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1157
1158 let (mut writer, _, _) = map.write(cx.as_ref());
1159 writer.fold(vec![5..8], cx.as_ref());
1160 let (snapshot, _) = map.read(cx.as_ref());
1161 assert_eq!(snapshot.text(), "abcde…ijkl");
1162
1163 // Create an fold adjacent to the start of the first fold.
1164 let (mut writer, _, _) = map.write(cx.as_ref());
1165 writer.fold(vec![0..1, 2..5], cx.as_ref());
1166 let (snapshot, _) = map.read(cx.as_ref());
1167 assert_eq!(snapshot.text(), "…b…ijkl");
1168
1169 // Create an fold adjacent to the end of the first fold.
1170 let (mut writer, _, _) = map.write(cx.as_ref());
1171 writer.fold(vec![11..11, 8..10], cx.as_ref());
1172 let (snapshot, _) = map.read(cx.as_ref());
1173 assert_eq!(snapshot.text(), "…b…kl");
1174 }
1175
1176 {
1177 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1178
1179 // Create two adjacent folds.
1180 let (mut writer, _, _) = map.write(cx.as_ref());
1181 writer.fold(vec![0..2, 2..5], cx.as_ref());
1182 let (snapshot, _) = map.read(cx.as_ref());
1183 assert_eq!(snapshot.text(), "…fghijkl");
1184
1185 // Edit within one of the folds.
1186 buffer.update(cx, |buffer, cx| buffer.edit(vec![0..1], "12345", cx));
1187 let (snapshot, _) = map.read(cx.as_ref());
1188 assert_eq!(snapshot.text(), "12345…fghijkl");
1189 }
1190 }
1191
1192 #[gpui::test]
1193 fn test_overlapping_folds(cx: &mut gpui::MutableAppContext) {
1194 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(5, 6), cx));
1195 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1196 let (mut writer, _, _) = map.write(cx.as_ref());
1197 writer.fold(
1198 vec![
1199 Point::new(0, 2)..Point::new(2, 2),
1200 Point::new(0, 4)..Point::new(1, 0),
1201 Point::new(1, 2)..Point::new(3, 2),
1202 Point::new(3, 1)..Point::new(4, 1),
1203 ],
1204 cx.as_ref(),
1205 );
1206 let (snapshot, _) = map.read(cx.as_ref());
1207 assert_eq!(snapshot.text(), "aa…eeeee");
1208 }
1209
1210 #[gpui::test]
1211 fn test_merging_folds_via_edit(cx: &mut gpui::MutableAppContext) {
1212 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(5, 6), cx));
1213 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1214
1215 let (mut writer, _, _) = map.write(cx.as_ref());
1216 writer.fold(
1217 vec![
1218 Point::new(0, 2)..Point::new(2, 2),
1219 Point::new(3, 1)..Point::new(4, 1),
1220 ],
1221 cx.as_ref(),
1222 );
1223 let (snapshot, _) = map.read(cx.as_ref());
1224 assert_eq!(snapshot.text(), "aa…cccc\nd…eeeee");
1225
1226 buffer.update(cx, |buffer, cx| {
1227 buffer.edit(Some(Point::new(2, 2)..Point::new(3, 1)), "", cx)
1228 });
1229 let (snapshot, _) = map.read(cx.as_ref());
1230 assert_eq!(snapshot.text(), "aa…eeeee");
1231 }
1232
1233 #[gpui::test]
1234 fn test_folds_in_range(cx: &mut gpui::MutableAppContext) {
1235 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(5, 6), cx));
1236 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1237 let buffer = buffer.read(cx);
1238
1239 let (mut writer, _, _) = map.write(cx.as_ref());
1240 writer.fold(
1241 vec![
1242 Point::new(0, 2)..Point::new(2, 2),
1243 Point::new(0, 4)..Point::new(1, 0),
1244 Point::new(1, 2)..Point::new(3, 2),
1245 Point::new(3, 1)..Point::new(4, 1),
1246 ],
1247 cx.as_ref(),
1248 );
1249 let (snapshot, _) = map.read(cx.as_ref());
1250 let fold_ranges = snapshot
1251 .folds_in_range(Point::new(1, 0)..Point::new(1, 3))
1252 .map(|fold| fold.start.to_point(buffer)..fold.end.to_point(buffer))
1253 .collect::<Vec<_>>();
1254 assert_eq!(
1255 fold_ranges,
1256 vec![
1257 Point::new(0, 2)..Point::new(2, 2),
1258 Point::new(1, 2)..Point::new(3, 2)
1259 ]
1260 );
1261 }
1262
1263 #[gpui::test(iterations = 100)]
1264 fn test_random_folds(cx: &mut gpui::MutableAppContext, mut rng: StdRng) {
1265 let operations = env::var("OPERATIONS")
1266 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
1267 .unwrap_or(10);
1268
1269 let buffer = cx.add_model(|cx| {
1270 let len = rng.gen_range(0..10);
1271 let text = RandomCharIter::new(&mut rng).take(len).collect::<String>();
1272 Buffer::new(0, text, cx)
1273 });
1274 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1275
1276 let (mut initial_snapshot, _) = map.read(cx.as_ref());
1277 let mut snapshot_edits = Vec::new();
1278
1279 for _ in 0..operations {
1280 log::info!("text: {:?}", buffer.read(cx).text());
1281 match rng.gen_range(0..=100) {
1282 0..=59 => {
1283 snapshot_edits.extend(map.randomly_mutate(&mut rng, cx.as_ref()));
1284 }
1285 _ => {
1286 let edits = buffer.update(cx, |buffer, _| {
1287 let start_version = buffer.version.clone();
1288 let edit_count = rng.gen_range(1..=5);
1289 buffer.randomly_edit(&mut rng, edit_count);
1290 buffer
1291 .edits_since::<Point>(&start_version)
1292 .collect::<Vec<_>>()
1293 });
1294 log::info!("editing {:?}", edits);
1295 }
1296 }
1297
1298 let buffer = map.buffer.read(cx).snapshot();
1299 let mut expected_text: String = buffer.text().to_string();
1300 let mut expected_buffer_rows = Vec::new();
1301 let mut next_row = buffer.max_point().row;
1302 for fold_range in map.merged_fold_ranges(cx.as_ref()).into_iter().rev() {
1303 let fold_start = buffer.point_for_offset(fold_range.start).unwrap();
1304 let fold_end = buffer.point_for_offset(fold_range.end).unwrap();
1305 expected_buffer_rows.extend((fold_end.row + 1..=next_row).rev());
1306 next_row = fold_start.row;
1307
1308 expected_text.replace_range(fold_range.start..fold_range.end, "…");
1309 }
1310 expected_buffer_rows.extend((0..=next_row).rev());
1311 expected_buffer_rows.reverse();
1312
1313 let (snapshot, edits) = map.read(cx.as_ref());
1314 assert_eq!(snapshot.text(), expected_text);
1315 snapshot_edits.push((snapshot.clone(), edits));
1316
1317 for (output_row, line) in expected_text.lines().enumerate() {
1318 let line_len = snapshot.line_len(output_row as u32);
1319 assert_eq!(line_len, line.len() as u32);
1320 }
1321
1322 let longest_row = snapshot.longest_row();
1323 let longest_char_column = expected_text
1324 .split('\n')
1325 .nth(longest_row as usize)
1326 .unwrap()
1327 .chars()
1328 .count();
1329 let mut fold_point = FoldPoint::new(0, 0);
1330 let mut fold_offset = FoldOffset(0);
1331 let mut char_column = 0;
1332 for c in expected_text.chars() {
1333 let buffer_point = fold_point.to_buffer_point(&snapshot);
1334 let buffer_offset = buffer_point.to_offset(&buffer);
1335 assert_eq!(
1336 buffer_point.to_fold_point(&snapshot, Right),
1337 fold_point,
1338 "{:?} -> fold point",
1339 buffer_point,
1340 );
1341 assert_eq!(
1342 fold_point.to_buffer_offset(&snapshot),
1343 buffer_offset,
1344 "fold_point.to_buffer_offset({:?})",
1345 fold_point,
1346 );
1347 assert_eq!(
1348 fold_point.to_offset(&snapshot),
1349 fold_offset,
1350 "fold_point.to_offset({:?})",
1351 fold_point,
1352 );
1353
1354 if c == '\n' {
1355 *fold_point.row_mut() += 1;
1356 *fold_point.column_mut() = 0;
1357 char_column = 0;
1358 } else {
1359 *fold_point.column_mut() += c.len_utf8() as u32;
1360 char_column += 1;
1361 }
1362 fold_offset.0 += c.len_utf8();
1363 if char_column > longest_char_column {
1364 panic!(
1365 "invalid longest row {:?} (chars {}), found row {:?} (chars: {})",
1366 longest_row,
1367 longest_char_column,
1368 fold_point.row(),
1369 char_column
1370 );
1371 }
1372 }
1373
1374 for _ in 0..5 {
1375 let mut start = snapshot
1376 .clip_offset(FoldOffset(rng.gen_range(0..=snapshot.len().0)), Bias::Left);
1377 let mut end = snapshot
1378 .clip_offset(FoldOffset(rng.gen_range(0..=snapshot.len().0)), Bias::Right);
1379 if start > end {
1380 mem::swap(&mut start, &mut end);
1381 }
1382
1383 let text = &expected_text[start.0..end.0];
1384 log::info!("slicing {:?}..{:?} (text: {:?})", start, end, text);
1385 assert_eq!(
1386 snapshot
1387 .chunks(start..end, false)
1388 .map(|c| c.text)
1389 .collect::<String>(),
1390 text,
1391 );
1392 }
1393
1394 for (idx, buffer_row) in expected_buffer_rows.iter().enumerate() {
1395 let fold_row = Point::new(*buffer_row, 0)
1396 .to_fold_point(&snapshot, Right)
1397 .row();
1398 assert_eq!(
1399 snapshot.buffer_rows(fold_row).collect::<Vec<_>>(),
1400 expected_buffer_rows[idx..],
1401 );
1402 }
1403
1404 for fold_range in map.merged_fold_ranges(cx.as_ref()) {
1405 let fold_point = fold_range
1406 .start
1407 .to_point(&buffer)
1408 .to_fold_point(&snapshot, Right);
1409 assert!(snapshot.is_line_folded(fold_point.row()));
1410 }
1411
1412 for _ in 0..5 {
1413 let end = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Right);
1414 let start = buffer.clip_offset(rng.gen_range(0..=end), Left);
1415 let expected_folds = map
1416 .folds
1417 .items(&buffer)
1418 .into_iter()
1419 .filter(|fold| {
1420 let start = buffer.anchor_before(start);
1421 let end = buffer.anchor_after(end);
1422 start.cmp(&fold.0.end, &buffer).unwrap() == Ordering::Less
1423 && end.cmp(&fold.0.start, &buffer).unwrap() == Ordering::Greater
1424 })
1425 .map(|fold| fold.0)
1426 .collect::<Vec<_>>();
1427
1428 assert_eq!(
1429 snapshot
1430 .folds_in_range(start..end)
1431 .cloned()
1432 .collect::<Vec<_>>(),
1433 expected_folds
1434 );
1435 }
1436
1437 let text = snapshot.text();
1438 for _ in 0..5 {
1439 let start_row = rng.gen_range(0..=snapshot.max_point().row());
1440 let start_column = rng.gen_range(0..=snapshot.line_len(start_row));
1441 let end_row = rng.gen_range(0..=snapshot.max_point().row());
1442 let end_column = rng.gen_range(0..=snapshot.line_len(end_row));
1443 let mut start =
1444 snapshot.clip_point(FoldPoint::new(start_row, start_column), Bias::Left);
1445 let mut end = snapshot.clip_point(FoldPoint::new(end_row, end_column), Bias::Right);
1446 if start > end {
1447 mem::swap(&mut start, &mut end);
1448 }
1449
1450 let lines = start..end;
1451 let bytes = start.to_offset(&snapshot)..end.to_offset(&snapshot);
1452 assert_eq!(
1453 snapshot.text_summary_for_range(lines),
1454 TextSummary::from(&text[bytes.start.0..bytes.end.0])
1455 )
1456 }
1457
1458 let mut text = initial_snapshot.text();
1459 for (snapshot, edits) in snapshot_edits.drain(..) {
1460 let new_text = snapshot.text();
1461 let mut delta = 0isize;
1462 for edit in edits {
1463 let old_bytes = ((edit.old_bytes.start.0 as isize) + delta) as usize
1464 ..((edit.old_bytes.end.0 as isize) + delta) as usize;
1465 let new_bytes = edit.new_bytes.start.0..edit.new_bytes.end.0;
1466 delta += edit.delta();
1467 text.replace_range(old_bytes, &new_text[new_bytes]);
1468 }
1469
1470 assert_eq!(text, new_text);
1471 initial_snapshot = snapshot;
1472 }
1473 }
1474 }
1475
1476 #[gpui::test]
1477 fn test_buffer_rows(cx: &mut gpui::MutableAppContext) {
1478 let text = sample_text(6, 6) + "\n";
1479 let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
1480
1481 let mut map = FoldMap::new(buffer.clone(), cx.as_ref()).0;
1482
1483 let (mut writer, _, _) = map.write(cx.as_ref());
1484 writer.fold(
1485 vec![
1486 Point::new(0, 2)..Point::new(2, 2),
1487 Point::new(3, 1)..Point::new(4, 1),
1488 ],
1489 cx.as_ref(),
1490 );
1491
1492 let (snapshot, _) = map.read(cx.as_ref());
1493 assert_eq!(snapshot.text(), "aa…cccc\nd…eeeee\nffffff\n");
1494 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), [0, 3, 5, 6]);
1495 assert_eq!(snapshot.buffer_rows(3).collect::<Vec<_>>(), [6]);
1496 }
1497
1498 impl FoldMap {
1499 fn merged_fold_ranges(&self, cx: &AppContext) -> Vec<Range<usize>> {
1500 let buffer = self.buffer.read(cx).snapshot();
1501 let mut folds = self.folds.items(&buffer);
1502 // Ensure sorting doesn't change how folds get merged and displayed.
1503 folds.sort_by(|a, b| a.0.cmp(&b.0, &buffer).unwrap());
1504 let mut fold_ranges = folds
1505 .iter()
1506 .map(|fold| fold.0.start.to_offset(&buffer)..fold.0.end.to_offset(&buffer))
1507 .peekable();
1508
1509 let mut merged_ranges = Vec::new();
1510 while let Some(mut fold_range) = fold_ranges.next() {
1511 while let Some(next_range) = fold_ranges.peek() {
1512 if fold_range.end >= next_range.start {
1513 if next_range.end > fold_range.end {
1514 fold_range.end = next_range.end;
1515 }
1516 fold_ranges.next();
1517 } else {
1518 break;
1519 }
1520 }
1521 if fold_range.end > fold_range.start {
1522 merged_ranges.push(fold_range);
1523 }
1524 }
1525 merged_ranges
1526 }
1527
1528 pub fn randomly_mutate(
1529 &mut self,
1530 rng: &mut impl Rng,
1531 cx: &AppContext,
1532 ) -> Vec<(Snapshot, Vec<FoldEdit>)> {
1533 let mut snapshot_edits = Vec::new();
1534 match rng.gen_range(0..=100) {
1535 0..=39 if !self.folds.is_empty() => {
1536 let buffer = self.buffer.read(cx);
1537 let mut to_unfold = Vec::new();
1538 for _ in 0..rng.gen_range(1..=3) {
1539 let end = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Right);
1540 let start = buffer.clip_offset(rng.gen_range(0..=end), Left);
1541 to_unfold.push(start..end);
1542 }
1543 log::info!("unfolding {:?}", to_unfold);
1544 let (mut writer, snapshot, edits) = self.write(cx.as_ref());
1545 snapshot_edits.push((snapshot, edits));
1546 let (snapshot, edits) = writer.fold(to_unfold, cx.as_ref());
1547 snapshot_edits.push((snapshot, edits));
1548 }
1549 _ => {
1550 let buffer = self.buffer.read(cx);
1551 let mut to_fold = Vec::new();
1552 for _ in 0..rng.gen_range(1..=2) {
1553 let end = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Right);
1554 let start = buffer.clip_offset(rng.gen_range(0..=end), Left);
1555 to_fold.push(start..end);
1556 }
1557 log::info!("folding {:?}", to_fold);
1558 let (mut writer, snapshot, edits) = self.write(cx.as_ref());
1559 snapshot_edits.push((snapshot, edits));
1560 let (snapshot, edits) = writer.fold(to_fold, cx.as_ref());
1561 snapshot_edits.push((snapshot, edits));
1562 }
1563 }
1564 snapshot_edits
1565 }
1566 }
1567}