1use super::{
2 Highlights,
3 fold_map::{Chunk, FoldRows},
4 tab_map::{self, TabEdit, TabPoint, TabSnapshot},
5};
6use gpui::{App, AppContext as _, Context, Entity, Font, LineWrapper, Pixels, Task};
7use language::Point;
8use multi_buffer::{MultiBufferSnapshot, RowInfo};
9use smol::future::yield_now;
10use std::sync::LazyLock;
11use std::{cmp, collections::VecDeque, mem, ops::Range, time::Duration};
12use sum_tree::{Bias, Cursor, Dimensions, SumTree};
13use text::Patch;
14
15pub use super::tab_map::TextSummary;
16pub type WrapEdit = text::Edit<u32>;
17
18/// Handles soft wrapping of text.
19///
20/// See the [`display_map` module documentation](crate::display_map) for more information.
21pub struct WrapMap {
22 snapshot: WrapSnapshot,
23 pending_edits: VecDeque<(TabSnapshot, Vec<TabEdit>)>,
24 interpolated_edits: Patch<u32>,
25 edits_since_sync: Patch<u32>,
26 wrap_width: Option<Pixels>,
27 background_task: Option<Task<()>>,
28 font_with_size: (Font, Pixels),
29}
30
31#[derive(Clone)]
32pub struct WrapSnapshot {
33 pub(super) tab_snapshot: TabSnapshot,
34 transforms: SumTree<Transform>,
35 interpolated: bool,
36}
37
38#[derive(Clone, Debug, Default, Eq, PartialEq)]
39struct Transform {
40 summary: TransformSummary,
41 display_text: Option<&'static str>,
42}
43
44#[derive(Clone, Debug, Default, Eq, PartialEq)]
45struct TransformSummary {
46 input: TextSummary,
47 output: TextSummary,
48}
49
50#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
51pub struct WrapPoint(pub Point);
52
53pub struct WrapChunks<'a> {
54 input_chunks: tab_map::TabChunks<'a>,
55 input_chunk: Chunk<'a>,
56 output_position: WrapPoint,
57 max_output_row: u32,
58 transforms: Cursor<'a, 'static, Transform, Dimensions<WrapPoint, TabPoint>>,
59 snapshot: &'a WrapSnapshot,
60}
61
62#[derive(Clone)]
63pub struct WrapRows<'a> {
64 input_buffer_rows: FoldRows<'a>,
65 input_buffer_row: RowInfo,
66 output_row: u32,
67 soft_wrapped: bool,
68 max_output_row: u32,
69 transforms: Cursor<'a, 'static, Transform, Dimensions<WrapPoint, TabPoint>>,
70}
71
72impl WrapRows<'_> {
73 pub(crate) fn seek(&mut self, start_row: u32) {
74 self.transforms
75 .seek(&WrapPoint::new(start_row, 0), Bias::Left);
76 let mut input_row = self.transforms.start().1.row();
77 if self.transforms.item().is_some_and(|t| t.is_isomorphic()) {
78 input_row += start_row - self.transforms.start().0.row();
79 }
80 self.soft_wrapped = self.transforms.item().is_some_and(|t| !t.is_isomorphic());
81 self.input_buffer_rows.seek(input_row);
82 self.input_buffer_row = self.input_buffer_rows.next().unwrap();
83 self.output_row = start_row;
84 }
85}
86
87impl WrapMap {
88 pub fn new(
89 tab_snapshot: TabSnapshot,
90 font: Font,
91 font_size: Pixels,
92 wrap_width: Option<Pixels>,
93 cx: &mut App,
94 ) -> (Entity<Self>, WrapSnapshot) {
95 let handle = cx.new(|cx| {
96 let mut this = Self {
97 font_with_size: (font, font_size),
98 wrap_width: None,
99 pending_edits: Default::default(),
100 interpolated_edits: Default::default(),
101 edits_since_sync: Default::default(),
102 snapshot: WrapSnapshot::new(tab_snapshot),
103 background_task: None,
104 };
105 this.set_wrap_width(wrap_width, cx);
106 mem::take(&mut this.edits_since_sync);
107 this
108 });
109 let snapshot = handle.read(cx).snapshot.clone();
110 (handle, snapshot)
111 }
112
113 #[cfg(test)]
114 pub fn is_rewrapping(&self) -> bool {
115 self.background_task.is_some()
116 }
117
118 pub fn sync(
119 &mut self,
120 tab_snapshot: TabSnapshot,
121 edits: Vec<TabEdit>,
122 cx: &mut Context<Self>,
123 ) -> (WrapSnapshot, Patch<u32>) {
124 if self.wrap_width.is_some() {
125 self.pending_edits.push_back((tab_snapshot, edits));
126 self.flush_edits(cx);
127 } else {
128 self.edits_since_sync = self
129 .edits_since_sync
130 .compose(self.snapshot.interpolate(tab_snapshot, &edits));
131 self.snapshot.interpolated = false;
132 }
133
134 (self.snapshot.clone(), mem::take(&mut self.edits_since_sync))
135 }
136
137 pub fn set_font_with_size(
138 &mut self,
139 font: Font,
140 font_size: Pixels,
141 cx: &mut Context<Self>,
142 ) -> bool {
143 let font_with_size = (font, font_size);
144
145 if font_with_size == self.font_with_size {
146 false
147 } else {
148 self.font_with_size = font_with_size;
149 self.rewrap(cx);
150 true
151 }
152 }
153
154 pub fn set_wrap_width(&mut self, wrap_width: Option<Pixels>, cx: &mut Context<Self>) -> bool {
155 if wrap_width == self.wrap_width {
156 return false;
157 }
158
159 self.wrap_width = wrap_width;
160 self.rewrap(cx);
161 true
162 }
163
164 fn rewrap(&mut self, cx: &mut Context<Self>) {
165 self.background_task.take();
166 self.interpolated_edits.clear();
167 self.pending_edits.clear();
168
169 if let Some(wrap_width) = self.wrap_width {
170 let mut new_snapshot = self.snapshot.clone();
171
172 let text_system = cx.text_system().clone();
173 let (font, font_size) = self.font_with_size.clone();
174 let task = cx.background_spawn(async move {
175 let mut line_wrapper = text_system.line_wrapper(font, font_size);
176 let tab_snapshot = new_snapshot.tab_snapshot.clone();
177 let range = TabPoint::zero()..tab_snapshot.max_point();
178 let edits = new_snapshot
179 .update(
180 tab_snapshot,
181 &[TabEdit {
182 old: range.clone(),
183 new: range.clone(),
184 }],
185 wrap_width,
186 &mut line_wrapper,
187 )
188 .await;
189 (new_snapshot, edits)
190 });
191
192 match cx
193 .background_executor()
194 .block_with_timeout(Duration::from_millis(5), task)
195 {
196 Ok((snapshot, edits)) => {
197 self.snapshot = snapshot;
198 self.edits_since_sync = self.edits_since_sync.compose(&edits);
199 }
200 Err(wrap_task) => {
201 self.background_task = Some(cx.spawn(async move |this, cx| {
202 let (snapshot, edits) = wrap_task.await;
203 this.update(cx, |this, cx| {
204 this.snapshot = snapshot;
205 this.edits_since_sync = this
206 .edits_since_sync
207 .compose(mem::take(&mut this.interpolated_edits).invert())
208 .compose(&edits);
209 this.background_task = None;
210 this.flush_edits(cx);
211 cx.notify();
212 })
213 .ok();
214 }));
215 }
216 }
217 } else {
218 let old_rows = self.snapshot.transforms.summary().output.lines.row + 1;
219 self.snapshot.transforms = SumTree::default();
220 let summary = self.snapshot.tab_snapshot.text_summary();
221 if !summary.lines.is_zero() {
222 self.snapshot
223 .transforms
224 .push(Transform::isomorphic(summary), ());
225 }
226 let new_rows = self.snapshot.transforms.summary().output.lines.row + 1;
227 self.snapshot.interpolated = false;
228 self.edits_since_sync = self.edits_since_sync.compose(Patch::new(vec![WrapEdit {
229 old: 0..old_rows,
230 new: 0..new_rows,
231 }]));
232 }
233 }
234
235 fn flush_edits(&mut self, cx: &mut Context<Self>) {
236 if !self.snapshot.interpolated {
237 let mut to_remove_len = 0;
238 for (tab_snapshot, _) in &self.pending_edits {
239 if tab_snapshot.version <= self.snapshot.tab_snapshot.version {
240 to_remove_len += 1;
241 } else {
242 break;
243 }
244 }
245 self.pending_edits.drain(..to_remove_len);
246 }
247
248 if self.pending_edits.is_empty() {
249 return;
250 }
251
252 if let Some(wrap_width) = self.wrap_width
253 && self.background_task.is_none()
254 {
255 let pending_edits = self.pending_edits.clone();
256 let mut snapshot = self.snapshot.clone();
257 let text_system = cx.text_system().clone();
258 let (font, font_size) = self.font_with_size.clone();
259 let update_task = cx.background_spawn(async move {
260 let mut edits = Patch::default();
261 let mut line_wrapper = text_system.line_wrapper(font, font_size);
262 for (tab_snapshot, tab_edits) in pending_edits {
263 let wrap_edits = snapshot
264 .update(tab_snapshot, &tab_edits, wrap_width, &mut line_wrapper)
265 .await;
266 edits = edits.compose(&wrap_edits);
267 }
268 (snapshot, edits)
269 });
270
271 match cx
272 .background_executor()
273 .block_with_timeout(Duration::from_millis(1), update_task)
274 {
275 Ok((snapshot, output_edits)) => {
276 self.snapshot = snapshot;
277 self.edits_since_sync = self.edits_since_sync.compose(&output_edits);
278 }
279 Err(update_task) => {
280 self.background_task = Some(cx.spawn(async move |this, cx| {
281 let (snapshot, edits) = update_task.await;
282 this.update(cx, |this, cx| {
283 this.snapshot = snapshot;
284 this.edits_since_sync = this
285 .edits_since_sync
286 .compose(mem::take(&mut this.interpolated_edits).invert())
287 .compose(&edits);
288 this.background_task = None;
289 this.flush_edits(cx);
290 cx.notify();
291 })
292 .ok();
293 }));
294 }
295 }
296 }
297
298 let was_interpolated = self.snapshot.interpolated;
299 let mut to_remove_len = 0;
300 for (tab_snapshot, edits) in &self.pending_edits {
301 if tab_snapshot.version <= self.snapshot.tab_snapshot.version {
302 to_remove_len += 1;
303 } else {
304 let interpolated_edits = self.snapshot.interpolate(tab_snapshot.clone(), edits);
305 self.edits_since_sync = self.edits_since_sync.compose(&interpolated_edits);
306 self.interpolated_edits = self.interpolated_edits.compose(&interpolated_edits);
307 }
308 }
309
310 if !was_interpolated {
311 self.pending_edits.drain(..to_remove_len);
312 }
313 }
314}
315
316impl WrapSnapshot {
317 fn new(tab_snapshot: TabSnapshot) -> Self {
318 let mut transforms = SumTree::default();
319 let extent = tab_snapshot.text_summary();
320 if !extent.lines.is_zero() {
321 transforms.push(Transform::isomorphic(extent), ());
322 }
323 Self {
324 transforms,
325 tab_snapshot,
326 interpolated: true,
327 }
328 }
329
330 pub fn buffer_snapshot(&self) -> &MultiBufferSnapshot {
331 self.tab_snapshot.buffer_snapshot()
332 }
333
334 fn interpolate(&mut self, new_tab_snapshot: TabSnapshot, tab_edits: &[TabEdit]) -> Patch<u32> {
335 let mut new_transforms;
336 if tab_edits.is_empty() {
337 new_transforms = self.transforms.clone();
338 } else {
339 let mut old_cursor = self.transforms.cursor::<TabPoint>(());
340
341 let mut tab_edits_iter = tab_edits.iter().peekable();
342 new_transforms =
343 old_cursor.slice(&tab_edits_iter.peek().unwrap().old.start, Bias::Right);
344
345 while let Some(edit) = tab_edits_iter.next() {
346 if edit.new.start > TabPoint::from(new_transforms.summary().input.lines) {
347 let summary = new_tab_snapshot.text_summary_for_range(
348 TabPoint::from(new_transforms.summary().input.lines)..edit.new.start,
349 );
350 new_transforms.push_or_extend(Transform::isomorphic(summary));
351 }
352
353 if !edit.new.is_empty() {
354 new_transforms.push_or_extend(Transform::isomorphic(
355 new_tab_snapshot.text_summary_for_range(edit.new.clone()),
356 ));
357 }
358
359 old_cursor.seek_forward(&edit.old.end, Bias::Right);
360 if let Some(next_edit) = tab_edits_iter.peek() {
361 if next_edit.old.start > old_cursor.end() {
362 if old_cursor.end() > edit.old.end {
363 let summary = self
364 .tab_snapshot
365 .text_summary_for_range(edit.old.end..old_cursor.end());
366 new_transforms.push_or_extend(Transform::isomorphic(summary));
367 }
368
369 old_cursor.next();
370 new_transforms
371 .append(old_cursor.slice(&next_edit.old.start, Bias::Right), ());
372 }
373 } else {
374 if old_cursor.end() > edit.old.end {
375 let summary = self
376 .tab_snapshot
377 .text_summary_for_range(edit.old.end..old_cursor.end());
378 new_transforms.push_or_extend(Transform::isomorphic(summary));
379 }
380 old_cursor.next();
381 new_transforms.append(old_cursor.suffix(), ());
382 }
383 }
384 }
385
386 let old_snapshot = mem::replace(
387 self,
388 WrapSnapshot {
389 tab_snapshot: new_tab_snapshot,
390 transforms: new_transforms,
391 interpolated: true,
392 },
393 );
394 self.check_invariants();
395 old_snapshot.compute_edits(tab_edits, self)
396 }
397
398 async fn update(
399 &mut self,
400 new_tab_snapshot: TabSnapshot,
401 tab_edits: &[TabEdit],
402 wrap_width: Pixels,
403 line_wrapper: &mut LineWrapper,
404 ) -> Patch<u32> {
405 #[derive(Debug)]
406 struct RowEdit {
407 old_rows: Range<u32>,
408 new_rows: Range<u32>,
409 }
410
411 let mut tab_edits_iter = tab_edits.iter().peekable();
412 let mut row_edits = Vec::with_capacity(tab_edits.len());
413 while let Some(edit) = tab_edits_iter.next() {
414 let mut row_edit = RowEdit {
415 old_rows: edit.old.start.row()..edit.old.end.row() + 1,
416 new_rows: edit.new.start.row()..edit.new.end.row() + 1,
417 };
418
419 while let Some(next_edit) = tab_edits_iter.peek() {
420 if next_edit.old.start.row() <= row_edit.old_rows.end {
421 row_edit.old_rows.end = next_edit.old.end.row() + 1;
422 row_edit.new_rows.end = next_edit.new.end.row() + 1;
423 tab_edits_iter.next();
424 } else {
425 break;
426 }
427 }
428
429 row_edits.push(row_edit);
430 }
431
432 let mut new_transforms;
433 if row_edits.is_empty() {
434 new_transforms = self.transforms.clone();
435 } else {
436 let mut row_edits = row_edits.into_iter().peekable();
437 let mut old_cursor = self.transforms.cursor::<TabPoint>(());
438
439 new_transforms = old_cursor.slice(
440 &TabPoint::new(row_edits.peek().unwrap().old_rows.start, 0),
441 Bias::Right,
442 );
443
444 while let Some(edit) = row_edits.next() {
445 if edit.new_rows.start > new_transforms.summary().input.lines.row {
446 let summary = new_tab_snapshot.text_summary_for_range(
447 TabPoint(new_transforms.summary().input.lines)
448 ..TabPoint::new(edit.new_rows.start, 0),
449 );
450 new_transforms.push_or_extend(Transform::isomorphic(summary));
451 }
452
453 let mut line = String::new();
454 let mut line_fragments = Vec::new();
455 let mut remaining = None;
456 let mut chunks = new_tab_snapshot.chunks(
457 TabPoint::new(edit.new_rows.start, 0)..new_tab_snapshot.max_point(),
458 false,
459 Highlights::default(),
460 );
461 let mut edit_transforms = Vec::<Transform>::new();
462 for _ in edit.new_rows.start..edit.new_rows.end {
463 while let Some(chunk) = remaining.take().or_else(|| chunks.next()) {
464 if let Some(ix) = chunk.text.find('\n') {
465 let (prefix, suffix) = chunk.text.split_at(ix + 1);
466 line_fragments.push(gpui::LineFragment::text(prefix));
467 line.push_str(prefix);
468 remaining = Some(Chunk {
469 text: suffix,
470 ..chunk
471 });
472 break;
473 } else {
474 if let Some(width) =
475 chunk.renderer.as_ref().and_then(|r| r.measured_width)
476 {
477 line_fragments
478 .push(gpui::LineFragment::element(width, chunk.text.len()));
479 } else {
480 line_fragments.push(gpui::LineFragment::text(chunk.text));
481 }
482 line.push_str(chunk.text);
483 }
484 }
485
486 if line.is_empty() {
487 break;
488 }
489
490 let mut prev_boundary_ix = 0;
491 for boundary in line_wrapper.wrap_line(&line_fragments, wrap_width) {
492 let wrapped = &line[prev_boundary_ix..boundary.ix];
493 push_isomorphic(&mut edit_transforms, TextSummary::from(wrapped));
494 edit_transforms.push(Transform::wrap(boundary.next_indent));
495 prev_boundary_ix = boundary.ix;
496 }
497
498 if prev_boundary_ix < line.len() {
499 push_isomorphic(
500 &mut edit_transforms,
501 TextSummary::from(&line[prev_boundary_ix..]),
502 );
503 }
504
505 line.clear();
506 line_fragments.clear();
507 yield_now().await;
508 }
509
510 let mut edit_transforms = edit_transforms.into_iter();
511 if let Some(transform) = edit_transforms.next() {
512 new_transforms.push_or_extend(transform);
513 }
514 new_transforms.extend(edit_transforms, ());
515
516 old_cursor.seek_forward(&TabPoint::new(edit.old_rows.end, 0), Bias::Right);
517 if let Some(next_edit) = row_edits.peek() {
518 if next_edit.old_rows.start > old_cursor.end().row() {
519 if old_cursor.end() > TabPoint::new(edit.old_rows.end, 0) {
520 let summary = self.tab_snapshot.text_summary_for_range(
521 TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(),
522 );
523 new_transforms.push_or_extend(Transform::isomorphic(summary));
524 }
525 old_cursor.next();
526 new_transforms.append(
527 old_cursor
528 .slice(&TabPoint::new(next_edit.old_rows.start, 0), Bias::Right),
529 (),
530 );
531 }
532 } else {
533 if old_cursor.end() > TabPoint::new(edit.old_rows.end, 0) {
534 let summary = self.tab_snapshot.text_summary_for_range(
535 TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(),
536 );
537 new_transforms.push_or_extend(Transform::isomorphic(summary));
538 }
539 old_cursor.next();
540 new_transforms.append(old_cursor.suffix(), ());
541 }
542 }
543 }
544
545 let old_snapshot = mem::replace(
546 self,
547 WrapSnapshot {
548 tab_snapshot: new_tab_snapshot,
549 transforms: new_transforms,
550 interpolated: false,
551 },
552 );
553 self.check_invariants();
554 old_snapshot.compute_edits(tab_edits, self)
555 }
556
557 fn compute_edits(&self, tab_edits: &[TabEdit], new_snapshot: &WrapSnapshot) -> Patch<u32> {
558 let mut wrap_edits = Vec::with_capacity(tab_edits.len());
559 let mut old_cursor = self.transforms.cursor::<TransformSummary>(());
560 let mut new_cursor = new_snapshot.transforms.cursor::<TransformSummary>(());
561 for mut tab_edit in tab_edits.iter().cloned() {
562 tab_edit.old.start.0.column = 0;
563 tab_edit.old.end.0 += Point::new(1, 0);
564 tab_edit.new.start.0.column = 0;
565 tab_edit.new.end.0 += Point::new(1, 0);
566
567 old_cursor.seek(&tab_edit.old.start, Bias::Right);
568 let mut old_start = old_cursor.start().output.lines;
569 old_start += tab_edit.old.start.0 - old_cursor.start().input.lines;
570
571 old_cursor.seek_forward(&tab_edit.old.end, Bias::Right);
572 let mut old_end = old_cursor.start().output.lines;
573 old_end += tab_edit.old.end.0 - old_cursor.start().input.lines;
574
575 new_cursor.seek(&tab_edit.new.start, Bias::Right);
576 let mut new_start = new_cursor.start().output.lines;
577 new_start += tab_edit.new.start.0 - new_cursor.start().input.lines;
578
579 new_cursor.seek_forward(&tab_edit.new.end, Bias::Right);
580 let mut new_end = new_cursor.start().output.lines;
581 new_end += tab_edit.new.end.0 - new_cursor.start().input.lines;
582
583 wrap_edits.push(WrapEdit {
584 old: old_start.row..old_end.row,
585 new: new_start.row..new_end.row,
586 });
587 }
588
589 wrap_edits = consolidate_wrap_edits(wrap_edits);
590 Patch::new(wrap_edits)
591 }
592
593 pub(crate) fn chunks<'a>(
594 &'a self,
595 rows: Range<u32>,
596 language_aware: bool,
597 highlights: Highlights<'a>,
598 ) -> WrapChunks<'a> {
599 let output_start = WrapPoint::new(rows.start, 0);
600 let output_end = WrapPoint::new(rows.end, 0);
601 let mut transforms = self
602 .transforms
603 .cursor::<Dimensions<WrapPoint, TabPoint>>(());
604 transforms.seek(&output_start, Bias::Right);
605 let mut input_start = TabPoint(transforms.start().1.0);
606 if transforms.item().is_some_and(|t| t.is_isomorphic()) {
607 input_start.0 += output_start.0 - transforms.start().0.0;
608 }
609 let input_end = self
610 .to_tab_point(output_end)
611 .min(self.tab_snapshot.max_point());
612 WrapChunks {
613 input_chunks: self.tab_snapshot.chunks(
614 input_start..input_end,
615 language_aware,
616 highlights,
617 ),
618 input_chunk: Default::default(),
619 output_position: output_start,
620 max_output_row: rows.end,
621 transforms,
622 snapshot: self,
623 }
624 }
625
626 pub fn max_point(&self) -> WrapPoint {
627 WrapPoint(self.transforms.summary().output.lines)
628 }
629
630 pub fn line_len(&self, row: u32) -> u32 {
631 let (start, _, item) = self.transforms.find::<Dimensions<WrapPoint, TabPoint>, _>(
632 (),
633 &WrapPoint::new(row + 1, 0),
634 Bias::Left,
635 );
636 if item.is_some_and(|transform| transform.is_isomorphic()) {
637 let overshoot = row - start.0.row();
638 let tab_row = start.1.row() + overshoot;
639 let tab_line_len = self.tab_snapshot.line_len(tab_row);
640 if overshoot == 0 {
641 start.0.column() + (tab_line_len - start.1.column())
642 } else {
643 tab_line_len
644 }
645 } else {
646 start.0.column()
647 }
648 }
649
650 pub fn text_summary_for_range(&self, rows: Range<u32>) -> TextSummary {
651 let mut summary = TextSummary::default();
652
653 let start = WrapPoint::new(rows.start, 0);
654 let end = WrapPoint::new(rows.end, 0);
655
656 let mut cursor = self
657 .transforms
658 .cursor::<Dimensions<WrapPoint, TabPoint>>(());
659 cursor.seek(&start, Bias::Right);
660 if let Some(transform) = cursor.item() {
661 let start_in_transform = start.0 - cursor.start().0.0;
662 let end_in_transform = cmp::min(end, cursor.end().0).0 - cursor.start().0.0;
663 if transform.is_isomorphic() {
664 let tab_start = TabPoint(cursor.start().1.0 + start_in_transform);
665 let tab_end = TabPoint(cursor.start().1.0 + end_in_transform);
666 summary += &self.tab_snapshot.text_summary_for_range(tab_start..tab_end);
667 } else {
668 debug_assert_eq!(start_in_transform.row, end_in_transform.row);
669 let indent_len = end_in_transform.column - start_in_transform.column;
670 summary += &TextSummary {
671 lines: Point::new(0, indent_len),
672 first_line_chars: indent_len,
673 last_line_chars: indent_len,
674 longest_row: 0,
675 longest_row_chars: indent_len,
676 };
677 }
678
679 cursor.next();
680 }
681
682 if rows.end > cursor.start().0.row() {
683 summary += &cursor
684 .summary::<_, TransformSummary>(&WrapPoint::new(rows.end, 0), Bias::Right)
685 .output;
686
687 if let Some(transform) = cursor.item() {
688 let end_in_transform = end.0 - cursor.start().0.0;
689 if transform.is_isomorphic() {
690 let char_start = cursor.start().1;
691 let char_end = TabPoint(char_start.0 + end_in_transform);
692 summary += &self
693 .tab_snapshot
694 .text_summary_for_range(char_start..char_end);
695 } else {
696 debug_assert_eq!(end_in_transform, Point::new(1, 0));
697 summary += &TextSummary {
698 lines: Point::new(1, 0),
699 first_line_chars: 0,
700 last_line_chars: 0,
701 longest_row: 0,
702 longest_row_chars: 0,
703 };
704 }
705 }
706 }
707
708 summary
709 }
710
711 pub fn soft_wrap_indent(&self, row: u32) -> Option<u32> {
712 let (.., item) =
713 self.transforms
714 .find::<WrapPoint, _>((), &WrapPoint::new(row + 1, 0), Bias::Right);
715 item.and_then(|transform| {
716 if transform.is_isomorphic() {
717 None
718 } else {
719 Some(transform.summary.output.lines.column)
720 }
721 })
722 }
723
724 pub fn longest_row(&self) -> u32 {
725 self.transforms.summary().output.longest_row
726 }
727
728 pub fn row_infos(&self, start_row: u32) -> WrapRows<'_> {
729 let mut transforms = self
730 .transforms
731 .cursor::<Dimensions<WrapPoint, TabPoint>>(());
732 transforms.seek(&WrapPoint::new(start_row, 0), Bias::Left);
733 let mut input_row = transforms.start().1.row();
734 if transforms.item().is_some_and(|t| t.is_isomorphic()) {
735 input_row += start_row - transforms.start().0.row();
736 }
737 let soft_wrapped = transforms.item().is_some_and(|t| !t.is_isomorphic());
738 let mut input_buffer_rows = self.tab_snapshot.rows(input_row);
739 let input_buffer_row = input_buffer_rows.next().unwrap();
740 WrapRows {
741 transforms,
742 input_buffer_row,
743 input_buffer_rows,
744 output_row: start_row,
745 soft_wrapped,
746 max_output_row: self.max_point().row(),
747 }
748 }
749
750 pub fn to_tab_point(&self, point: WrapPoint) -> TabPoint {
751 let (start, _, item) =
752 self.transforms
753 .find::<Dimensions<WrapPoint, TabPoint>, _>((), &point, Bias::Right);
754 let mut tab_point = start.1.0;
755 if item.is_some_and(|t| t.is_isomorphic()) {
756 tab_point += point.0 - start.0.0;
757 }
758 TabPoint(tab_point)
759 }
760
761 pub fn to_point(&self, point: WrapPoint, bias: Bias) -> Point {
762 self.tab_snapshot.to_point(self.to_tab_point(point), bias)
763 }
764
765 pub fn make_wrap_point(&self, point: Point, bias: Bias) -> WrapPoint {
766 self.tab_point_to_wrap_point(self.tab_snapshot.make_tab_point(point, bias))
767 }
768
769 pub fn tab_point_to_wrap_point(&self, point: TabPoint) -> WrapPoint {
770 let (start, ..) =
771 self.transforms
772 .find::<Dimensions<TabPoint, WrapPoint>, _>((), &point, Bias::Right);
773 WrapPoint(start.1.0 + (point.0 - start.0.0))
774 }
775
776 pub fn clip_point(&self, mut point: WrapPoint, bias: Bias) -> WrapPoint {
777 if bias == Bias::Left {
778 let (start, _, item) = self
779 .transforms
780 .find::<WrapPoint, _>((), &point, Bias::Right);
781 if item.is_some_and(|t| !t.is_isomorphic()) {
782 point = start;
783 *point.column_mut() -= 1;
784 }
785 }
786
787 self.tab_point_to_wrap_point(self.tab_snapshot.clip_point(self.to_tab_point(point), bias))
788 }
789
790 pub fn prev_row_boundary(&self, mut point: WrapPoint) -> u32 {
791 if self.transforms.is_empty() {
792 return 0;
793 }
794
795 *point.column_mut() = 0;
796
797 let mut cursor = self
798 .transforms
799 .cursor::<Dimensions<WrapPoint, TabPoint>>(());
800 cursor.seek(&point, Bias::Right);
801 if cursor.item().is_none() {
802 cursor.prev();
803 }
804
805 while let Some(transform) = cursor.item() {
806 if transform.is_isomorphic() && cursor.start().1.column() == 0 {
807 return cmp::min(cursor.end().0.row(), point.row());
808 } else {
809 cursor.prev();
810 }
811 }
812
813 unreachable!()
814 }
815
816 pub fn next_row_boundary(&self, mut point: WrapPoint) -> Option<u32> {
817 point.0 += Point::new(1, 0);
818
819 let mut cursor = self
820 .transforms
821 .cursor::<Dimensions<WrapPoint, TabPoint>>(());
822 cursor.seek(&point, Bias::Right);
823 while let Some(transform) = cursor.item() {
824 if transform.is_isomorphic() && cursor.start().1.column() == 0 {
825 return Some(cmp::max(cursor.start().0.row(), point.row()));
826 } else {
827 cursor.next();
828 }
829 }
830
831 None
832 }
833
834 #[cfg(test)]
835 pub fn text(&self) -> String {
836 self.text_chunks(0).collect()
837 }
838
839 #[cfg(test)]
840 pub fn text_chunks(&self, wrap_row: u32) -> impl Iterator<Item = &str> {
841 self.chunks(
842 wrap_row..self.max_point().row() + 1,
843 false,
844 Highlights::default(),
845 )
846 .map(|h| h.text)
847 }
848
849 fn check_invariants(&self) {
850 #[cfg(test)]
851 {
852 assert_eq!(
853 TabPoint::from(self.transforms.summary().input.lines),
854 self.tab_snapshot.max_point()
855 );
856
857 {
858 let mut transforms = self.transforms.cursor::<()>(()).peekable();
859 while let Some(transform) = transforms.next() {
860 if let Some(next_transform) = transforms.peek() {
861 assert!(transform.is_isomorphic() != next_transform.is_isomorphic());
862 }
863 }
864 }
865
866 let text = language::Rope::from(self.text().as_str());
867 let mut input_buffer_rows = self.tab_snapshot.rows(0);
868 let mut expected_buffer_rows = Vec::new();
869 let mut prev_tab_row = 0;
870 for display_row in 0..=self.max_point().row() {
871 let tab_point = self.to_tab_point(WrapPoint::new(display_row, 0));
872 if tab_point.row() == prev_tab_row && display_row != 0 {
873 expected_buffer_rows.push(None);
874 } else {
875 expected_buffer_rows.push(input_buffer_rows.next().unwrap().buffer_row);
876 }
877
878 prev_tab_row = tab_point.row();
879 assert_eq!(self.line_len(display_row), text.line_len(display_row));
880 }
881
882 for start_display_row in 0..expected_buffer_rows.len() {
883 assert_eq!(
884 self.row_infos(start_display_row as u32)
885 .map(|row_info| row_info.buffer_row)
886 .collect::<Vec<_>>(),
887 &expected_buffer_rows[start_display_row..],
888 "invalid buffer_rows({}..)",
889 start_display_row
890 );
891 }
892 }
893 }
894}
895
896impl WrapChunks<'_> {
897 pub(crate) fn seek(&mut self, rows: Range<u32>) {
898 let output_start = WrapPoint::new(rows.start, 0);
899 let output_end = WrapPoint::new(rows.end, 0);
900 self.transforms.seek(&output_start, Bias::Right);
901 let mut input_start = TabPoint(self.transforms.start().1.0);
902 if self.transforms.item().is_some_and(|t| t.is_isomorphic()) {
903 input_start.0 += output_start.0 - self.transforms.start().0.0;
904 }
905 let input_end = self
906 .snapshot
907 .to_tab_point(output_end)
908 .min(self.snapshot.tab_snapshot.max_point());
909 self.input_chunks.seek(input_start..input_end);
910 self.input_chunk = Chunk::default();
911 self.output_position = output_start;
912 self.max_output_row = rows.end;
913 }
914}
915
916impl<'a> Iterator for WrapChunks<'a> {
917 type Item = Chunk<'a>;
918
919 fn next(&mut self) -> Option<Self::Item> {
920 if self.output_position.row() >= self.max_output_row {
921 return None;
922 }
923
924 let transform = self.transforms.item()?;
925 if let Some(display_text) = transform.display_text {
926 let mut start_ix = 0;
927 let mut end_ix = display_text.len();
928 let mut summary = transform.summary.output.lines;
929
930 if self.output_position > self.transforms.start().0 {
931 // Exclude newline starting prior to the desired row.
932 start_ix = 1;
933 summary.row = 0;
934 } else if self.output_position.row() + 1 >= self.max_output_row {
935 // Exclude soft indentation ending after the desired row.
936 end_ix = 1;
937 summary.column = 0;
938 }
939
940 self.output_position.0 += summary;
941 self.transforms.next();
942 return Some(Chunk {
943 text: &display_text[start_ix..end_ix],
944 ..Default::default()
945 });
946 }
947
948 if self.input_chunk.text.is_empty() {
949 self.input_chunk = self.input_chunks.next().unwrap();
950 }
951
952 let mut input_len = 0;
953 let transform_end = self.transforms.end().0;
954 for c in self.input_chunk.text.chars() {
955 let char_len = c.len_utf8();
956 input_len += char_len;
957 if c == '\n' {
958 *self.output_position.row_mut() += 1;
959 *self.output_position.column_mut() = 0;
960 } else {
961 *self.output_position.column_mut() += char_len as u32;
962 }
963
964 if self.output_position >= transform_end {
965 self.transforms.next();
966 break;
967 }
968 }
969
970 let (prefix, suffix) = self.input_chunk.text.split_at(input_len);
971
972 let mask = 1u128.unbounded_shl(input_len as u32).wrapping_sub(1);
973 let chars = self.input_chunk.chars & mask;
974 let tabs = self.input_chunk.tabs & mask;
975 self.input_chunk.tabs = self.input_chunk.tabs.unbounded_shr(input_len as u32);
976 self.input_chunk.chars = self.input_chunk.chars.unbounded_shr(input_len as u32);
977
978 self.input_chunk.text = suffix;
979 Some(Chunk {
980 text: prefix,
981 chars,
982 tabs,
983 ..self.input_chunk.clone()
984 })
985 }
986}
987
988impl Iterator for WrapRows<'_> {
989 type Item = RowInfo;
990
991 fn next(&mut self) -> Option<Self::Item> {
992 if self.output_row > self.max_output_row {
993 return None;
994 }
995
996 let buffer_row = self.input_buffer_row;
997 let soft_wrapped = self.soft_wrapped;
998 let diff_status = self.input_buffer_row.diff_status;
999
1000 self.output_row += 1;
1001 self.transforms
1002 .seek_forward(&WrapPoint::new(self.output_row, 0), Bias::Left);
1003 if self.transforms.item().is_some_and(|t| t.is_isomorphic()) {
1004 self.input_buffer_row = self.input_buffer_rows.next().unwrap();
1005 self.soft_wrapped = false;
1006 } else {
1007 self.soft_wrapped = true;
1008 }
1009
1010 Some(if soft_wrapped {
1011 RowInfo {
1012 buffer_id: None,
1013 buffer_row: None,
1014 multibuffer_row: None,
1015 diff_status,
1016 expand_info: None,
1017 }
1018 } else {
1019 buffer_row
1020 })
1021 }
1022}
1023
1024impl Transform {
1025 fn isomorphic(summary: TextSummary) -> Self {
1026 #[cfg(test)]
1027 assert!(!summary.lines.is_zero());
1028
1029 Self {
1030 summary: TransformSummary {
1031 input: summary.clone(),
1032 output: summary,
1033 },
1034 display_text: None,
1035 }
1036 }
1037
1038 fn wrap(indent: u32) -> Self {
1039 static WRAP_TEXT: LazyLock<String> = LazyLock::new(|| {
1040 let mut wrap_text = String::new();
1041 wrap_text.push('\n');
1042 wrap_text.extend((0..LineWrapper::MAX_INDENT as usize).map(|_| ' '));
1043 wrap_text
1044 });
1045
1046 Self {
1047 summary: TransformSummary {
1048 input: TextSummary::default(),
1049 output: TextSummary {
1050 lines: Point::new(1, indent),
1051 first_line_chars: 0,
1052 last_line_chars: indent,
1053 longest_row: 1,
1054 longest_row_chars: indent,
1055 },
1056 },
1057 display_text: Some(&WRAP_TEXT[..1 + indent as usize]),
1058 }
1059 }
1060
1061 fn is_isomorphic(&self) -> bool {
1062 self.display_text.is_none()
1063 }
1064}
1065
1066impl sum_tree::Item for Transform {
1067 type Summary = TransformSummary;
1068
1069 fn summary(&self, _cx: ()) -> Self::Summary {
1070 self.summary.clone()
1071 }
1072}
1073
1074fn push_isomorphic(transforms: &mut Vec<Transform>, summary: TextSummary) {
1075 if let Some(last_transform) = transforms.last_mut()
1076 && last_transform.is_isomorphic()
1077 {
1078 last_transform.summary.input += &summary;
1079 last_transform.summary.output += &summary;
1080 return;
1081 }
1082 transforms.push(Transform::isomorphic(summary));
1083}
1084
1085trait SumTreeExt {
1086 fn push_or_extend(&mut self, transform: Transform);
1087}
1088
1089impl SumTreeExt for SumTree<Transform> {
1090 fn push_or_extend(&mut self, transform: Transform) {
1091 let mut transform = Some(transform);
1092 self.update_last(
1093 |last_transform| {
1094 if last_transform.is_isomorphic() && transform.as_ref().unwrap().is_isomorphic() {
1095 let transform = transform.take().unwrap();
1096 last_transform.summary.input += &transform.summary.input;
1097 last_transform.summary.output += &transform.summary.output;
1098 }
1099 },
1100 (),
1101 );
1102
1103 if let Some(transform) = transform {
1104 self.push(transform, ());
1105 }
1106 }
1107}
1108
1109impl WrapPoint {
1110 pub fn new(row: u32, column: u32) -> Self {
1111 Self(Point::new(row, column))
1112 }
1113
1114 pub fn row(self) -> u32 {
1115 self.0.row
1116 }
1117
1118 pub fn row_mut(&mut self) -> &mut u32 {
1119 &mut self.0.row
1120 }
1121
1122 pub fn column(self) -> u32 {
1123 self.0.column
1124 }
1125
1126 pub fn column_mut(&mut self) -> &mut u32 {
1127 &mut self.0.column
1128 }
1129}
1130
1131impl sum_tree::ContextLessSummary for TransformSummary {
1132 fn zero() -> Self {
1133 Default::default()
1134 }
1135
1136 fn add_summary(&mut self, other: &Self) {
1137 self.input += &other.input;
1138 self.output += &other.output;
1139 }
1140}
1141
1142impl<'a> sum_tree::Dimension<'a, TransformSummary> for TabPoint {
1143 fn zero(_cx: ()) -> Self {
1144 Default::default()
1145 }
1146
1147 fn add_summary(&mut self, summary: &'a TransformSummary, _: ()) {
1148 self.0 += summary.input.lines;
1149 }
1150}
1151
1152impl sum_tree::SeekTarget<'_, TransformSummary, TransformSummary> for TabPoint {
1153 fn cmp(&self, cursor_location: &TransformSummary, _: ()) -> std::cmp::Ordering {
1154 Ord::cmp(&self.0, &cursor_location.input.lines)
1155 }
1156}
1157
1158impl<'a> sum_tree::Dimension<'a, TransformSummary> for WrapPoint {
1159 fn zero(_cx: ()) -> Self {
1160 Default::default()
1161 }
1162
1163 fn add_summary(&mut self, summary: &'a TransformSummary, _: ()) {
1164 self.0 += summary.output.lines;
1165 }
1166}
1167
1168fn consolidate_wrap_edits(edits: Vec<WrapEdit>) -> Vec<WrapEdit> {
1169 let _old_alloc_ptr = edits.as_ptr();
1170 let mut wrap_edits = edits.into_iter();
1171
1172 if let Some(mut first_edit) = wrap_edits.next() {
1173 // This code relies on reusing allocations from the Vec<_> - at the time of writing .flatten() prevents them.
1174 #[allow(clippy::filter_map_identity)]
1175 let mut v: Vec<_> = wrap_edits
1176 .scan(&mut first_edit, |prev_edit, edit| {
1177 if prev_edit.old.end >= edit.old.start {
1178 prev_edit.old.end = edit.old.end;
1179 prev_edit.new.end = edit.new.end;
1180 Some(None) // Skip this edit, it's merged
1181 } else {
1182 let prev = std::mem::replace(*prev_edit, edit);
1183 Some(Some(prev)) // Yield the previous edit
1184 }
1185 })
1186 .filter_map(|x| x)
1187 .collect();
1188 v.push(first_edit.clone());
1189 debug_assert_eq!(v.as_ptr(), _old_alloc_ptr, "Wrap edits were reallocated");
1190 v
1191 } else {
1192 vec![]
1193 }
1194}
1195
1196#[cfg(test)]
1197mod tests {
1198 use super::*;
1199 use crate::{
1200 MultiBuffer,
1201 display_map::{fold_map::FoldMap, inlay_map::InlayMap, tab_map::TabMap},
1202 test::test_font,
1203 };
1204 use gpui::{LineFragment, px, test::observe};
1205 use rand::prelude::*;
1206 use settings::SettingsStore;
1207 use smol::stream::StreamExt;
1208 use std::{cmp, env, num::NonZeroU32};
1209 use text::Rope;
1210 use theme::LoadThemes;
1211
1212 #[gpui::test(iterations = 100)]
1213 async fn test_random_wraps(cx: &mut gpui::TestAppContext, mut rng: StdRng) {
1214 // todo this test is flaky
1215 init_test(cx);
1216
1217 cx.background_executor.set_block_on_ticks(0..=50);
1218 let operations = env::var("OPERATIONS")
1219 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
1220 .unwrap_or(10);
1221
1222 let text_system = cx.read(|cx| cx.text_system().clone());
1223 let mut wrap_width = if rng.random_bool(0.1) {
1224 None
1225 } else {
1226 Some(px(rng.random_range(0.0..=1000.0)))
1227 };
1228 let tab_size = NonZeroU32::new(rng.random_range(1..=4)).unwrap();
1229
1230 let font = test_font();
1231 let _font_id = text_system.resolve_font(&font);
1232 let font_size = px(14.0);
1233
1234 log::info!("Tab size: {}", tab_size);
1235 log::info!("Wrap width: {:?}", wrap_width);
1236
1237 let buffer = cx.update(|cx| {
1238 if rng.random() {
1239 MultiBuffer::build_random(&mut rng, cx)
1240 } else {
1241 let len = rng.random_range(0..10);
1242 let text = util::RandomCharIter::new(&mut rng)
1243 .take(len)
1244 .collect::<String>();
1245 MultiBuffer::build_simple(&text, cx)
1246 }
1247 });
1248 let mut buffer_snapshot = buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx));
1249 log::info!("Buffer text: {:?}", buffer_snapshot.text());
1250 let (mut inlay_map, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
1251 log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1252 let (mut fold_map, fold_snapshot) = FoldMap::new(inlay_snapshot.clone());
1253 log::info!("FoldMap text: {:?}", fold_snapshot.text());
1254 let (mut tab_map, _) = TabMap::new(fold_snapshot.clone(), tab_size);
1255 let tabs_snapshot = tab_map.set_max_expansion_column(32);
1256 log::info!("TabMap text: {:?}", tabs_snapshot.text());
1257
1258 let mut line_wrapper = text_system.line_wrapper(font.clone(), font_size);
1259 let expected_text = wrap_text(&tabs_snapshot, wrap_width, &mut line_wrapper);
1260
1261 let (wrap_map, _) =
1262 cx.update(|cx| WrapMap::new(tabs_snapshot.clone(), font, font_size, wrap_width, cx));
1263 let mut notifications = observe(&wrap_map, cx);
1264
1265 if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1266 notifications.next().await.unwrap();
1267 }
1268
1269 let (initial_snapshot, _) = wrap_map.update(cx, |map, cx| {
1270 assert!(!map.is_rewrapping());
1271 map.sync(tabs_snapshot.clone(), Vec::new(), cx)
1272 });
1273
1274 let actual_text = initial_snapshot.text();
1275 assert_eq!(
1276 actual_text,
1277 expected_text,
1278 "unwrapped text is: {:?}",
1279 tabs_snapshot.text()
1280 );
1281 log::info!("Wrapped text: {:?}", actual_text);
1282
1283 let mut next_inlay_id = 0;
1284 let mut edits = Vec::new();
1285 for _i in 0..operations {
1286 log::info!("{} ==============================================", _i);
1287
1288 let mut buffer_edits = Vec::new();
1289 match rng.random_range(0..=100) {
1290 0..=19 => {
1291 wrap_width = if rng.random_bool(0.2) {
1292 None
1293 } else {
1294 Some(px(rng.random_range(0.0..=1000.0)))
1295 };
1296 log::info!("Setting wrap width to {:?}", wrap_width);
1297 wrap_map.update(cx, |map, cx| map.set_wrap_width(wrap_width, cx));
1298 }
1299 20..=39 => {
1300 for (fold_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
1301 let (tabs_snapshot, tab_edits) =
1302 tab_map.sync(fold_snapshot, fold_edits, tab_size);
1303 let (mut snapshot, wrap_edits) =
1304 wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1305 snapshot.check_invariants();
1306 snapshot.verify_chunks(&mut rng);
1307 edits.push((snapshot, wrap_edits));
1308 }
1309 }
1310 40..=59 => {
1311 let (inlay_snapshot, inlay_edits) =
1312 inlay_map.randomly_mutate(&mut next_inlay_id, &mut rng);
1313 let (fold_snapshot, fold_edits) = fold_map.read(inlay_snapshot, inlay_edits);
1314 let (tabs_snapshot, tab_edits) =
1315 tab_map.sync(fold_snapshot, fold_edits, tab_size);
1316 let (mut snapshot, wrap_edits) =
1317 wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1318 snapshot.check_invariants();
1319 snapshot.verify_chunks(&mut rng);
1320 edits.push((snapshot, wrap_edits));
1321 }
1322 _ => {
1323 buffer.update(cx, |buffer, cx| {
1324 let subscription = buffer.subscribe();
1325 let edit_count = rng.random_range(1..=5);
1326 buffer.randomly_mutate(&mut rng, edit_count, cx);
1327 buffer_snapshot = buffer.snapshot(cx);
1328 buffer_edits.extend(subscription.consume());
1329 });
1330 }
1331 }
1332
1333 log::info!("Buffer text: {:?}", buffer_snapshot.text());
1334 let (inlay_snapshot, inlay_edits) =
1335 inlay_map.sync(buffer_snapshot.clone(), buffer_edits);
1336 log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1337 let (fold_snapshot, fold_edits) = fold_map.read(inlay_snapshot, inlay_edits);
1338 log::info!("FoldMap text: {:?}", fold_snapshot.text());
1339 let (tabs_snapshot, tab_edits) = tab_map.sync(fold_snapshot, fold_edits, tab_size);
1340 log::info!("TabMap text: {:?}", tabs_snapshot.text());
1341
1342 let expected_text = wrap_text(&tabs_snapshot, wrap_width, &mut line_wrapper);
1343 let (mut snapshot, wrap_edits) =
1344 wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot.clone(), tab_edits, cx));
1345 snapshot.check_invariants();
1346 snapshot.verify_chunks(&mut rng);
1347 edits.push((snapshot, wrap_edits));
1348
1349 if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) && rng.random_bool(0.4) {
1350 log::info!("Waiting for wrapping to finish");
1351 while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1352 notifications.next().await.unwrap();
1353 }
1354 wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1355 }
1356
1357 if !wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1358 let (mut wrapped_snapshot, wrap_edits) = wrap_map.update(cx, |map, cx| {
1359 map.sync(tabs_snapshot.clone(), Vec::new(), cx)
1360 });
1361 let actual_text = wrapped_snapshot.text();
1362 let actual_longest_row = wrapped_snapshot.longest_row();
1363 log::info!("Wrapping finished: {:?}", actual_text);
1364 wrapped_snapshot.check_invariants();
1365 wrapped_snapshot.verify_chunks(&mut rng);
1366 edits.push((wrapped_snapshot.clone(), wrap_edits));
1367 assert_eq!(
1368 actual_text,
1369 expected_text,
1370 "unwrapped text is: {:?}",
1371 tabs_snapshot.text()
1372 );
1373
1374 let mut summary = TextSummary::default();
1375 for (ix, item) in wrapped_snapshot
1376 .transforms
1377 .items(())
1378 .into_iter()
1379 .enumerate()
1380 {
1381 summary += &item.summary.output;
1382 log::info!("{} summary: {:?}", ix, item.summary.output,);
1383 }
1384
1385 if tab_size.get() == 1
1386 || !wrapped_snapshot
1387 .tab_snapshot
1388 .fold_snapshot
1389 .text()
1390 .contains('\t')
1391 {
1392 let mut expected_longest_rows = Vec::new();
1393 let mut longest_line_len = -1;
1394 for (row, line) in expected_text.split('\n').enumerate() {
1395 let line_char_count = line.chars().count() as isize;
1396 if line_char_count > longest_line_len {
1397 expected_longest_rows.clear();
1398 longest_line_len = line_char_count;
1399 }
1400 if line_char_count >= longest_line_len {
1401 expected_longest_rows.push(row as u32);
1402 }
1403 }
1404
1405 assert!(
1406 expected_longest_rows.contains(&actual_longest_row),
1407 "incorrect longest row {}. expected {:?} with length {}",
1408 actual_longest_row,
1409 expected_longest_rows,
1410 longest_line_len,
1411 )
1412 }
1413 }
1414 }
1415
1416 let mut initial_text = Rope::from(initial_snapshot.text().as_str());
1417 for (snapshot, patch) in edits {
1418 let snapshot_text = Rope::from(snapshot.text().as_str());
1419 for edit in &patch {
1420 let old_start = initial_text.point_to_offset(Point::new(edit.new.start, 0));
1421 let old_end = initial_text.point_to_offset(cmp::min(
1422 Point::new(edit.new.start + edit.old.len() as u32, 0),
1423 initial_text.max_point(),
1424 ));
1425 let new_start = snapshot_text.point_to_offset(Point::new(edit.new.start, 0));
1426 let new_end = snapshot_text.point_to_offset(cmp::min(
1427 Point::new(edit.new.end, 0),
1428 snapshot_text.max_point(),
1429 ));
1430 let new_text = snapshot_text
1431 .chunks_in_range(new_start..new_end)
1432 .collect::<String>();
1433
1434 initial_text.replace(old_start..old_end, &new_text);
1435 }
1436 assert_eq!(initial_text.to_string(), snapshot_text.to_string());
1437 }
1438
1439 if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1440 log::info!("Waiting for wrapping to finish");
1441 while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1442 notifications.next().await.unwrap();
1443 }
1444 }
1445 wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1446 }
1447
1448 fn init_test(cx: &mut gpui::TestAppContext) {
1449 cx.update(|cx| {
1450 let settings = SettingsStore::test(cx);
1451 cx.set_global(settings);
1452 theme::init(LoadThemes::JustBase, cx);
1453 });
1454 }
1455
1456 fn wrap_text(
1457 tab_snapshot: &TabSnapshot,
1458 wrap_width: Option<Pixels>,
1459 line_wrapper: &mut LineWrapper,
1460 ) -> String {
1461 if let Some(wrap_width) = wrap_width {
1462 let mut wrapped_text = String::new();
1463 for (row, line) in tab_snapshot.text().split('\n').enumerate() {
1464 if row > 0 {
1465 wrapped_text.push('\n');
1466 }
1467
1468 let mut prev_ix = 0;
1469 for boundary in line_wrapper.wrap_line(&[LineFragment::text(line)], wrap_width) {
1470 wrapped_text.push_str(&line[prev_ix..boundary.ix]);
1471 wrapped_text.push('\n');
1472 wrapped_text.push_str(&" ".repeat(boundary.next_indent as usize));
1473 prev_ix = boundary.ix;
1474 }
1475 wrapped_text.push_str(&line[prev_ix..]);
1476 }
1477
1478 wrapped_text
1479 } else {
1480 tab_snapshot.text()
1481 }
1482 }
1483
1484 impl WrapSnapshot {
1485 fn verify_chunks(&mut self, rng: &mut impl Rng) {
1486 for _ in 0..5 {
1487 let mut end_row = rng.random_range(0..=self.max_point().row());
1488 let start_row = rng.random_range(0..=end_row);
1489 end_row += 1;
1490
1491 let mut expected_text = self.text_chunks(start_row).collect::<String>();
1492 if expected_text.ends_with('\n') {
1493 expected_text.push('\n');
1494 }
1495 let mut expected_text = expected_text
1496 .lines()
1497 .take((end_row - start_row) as usize)
1498 .collect::<Vec<_>>()
1499 .join("\n");
1500 if end_row <= self.max_point().row() {
1501 expected_text.push('\n');
1502 }
1503
1504 let actual_text = self
1505 .chunks(start_row..end_row, true, Highlights::default())
1506 .map(|c| c.text)
1507 .collect::<String>();
1508 assert_eq!(
1509 expected_text,
1510 actual_text,
1511 "chunks != highlighted_chunks for rows {:?}",
1512 start_row..end_row
1513 );
1514 }
1515 }
1516 }
1517}