1use super::{
2 fold_map::{self, FoldChunks, FoldEdit, FoldPoint, FoldSnapshot},
3 TextHighlights,
4};
5use crate::MultiBufferSnapshot;
6use gpui::fonts::HighlightStyle;
7use language::{Chunk, Point};
8use parking_lot::Mutex;
9use std::{cmp, mem, num::NonZeroU32, ops::Range};
10use sum_tree::Bias;
11
12const MAX_EXPANSION_COLUMN: u32 = 256;
13
14pub struct TabMap(Mutex<TabSnapshot>);
15
16impl TabMap {
17 pub fn new(fold_snapshot: FoldSnapshot, tab_size: NonZeroU32) -> (Self, TabSnapshot) {
18 let snapshot = TabSnapshot {
19 fold_snapshot,
20 tab_size,
21 max_expansion_column: MAX_EXPANSION_COLUMN,
22 version: 0,
23 };
24 (Self(Mutex::new(snapshot.clone())), snapshot)
25 }
26
27 #[cfg(test)]
28 pub fn set_max_expansion_column(&self, column: u32) -> TabSnapshot {
29 self.0.lock().max_expansion_column = column;
30 self.0.lock().clone()
31 }
32
33 pub fn sync(
34 &self,
35 fold_snapshot: FoldSnapshot,
36 mut fold_edits: Vec<FoldEdit>,
37 tab_size: NonZeroU32,
38 ) -> (TabSnapshot, Vec<TabEdit>) {
39 let mut old_snapshot = self.0.lock();
40 let mut new_snapshot = TabSnapshot {
41 fold_snapshot,
42 tab_size,
43 max_expansion_column: old_snapshot.max_expansion_column,
44 version: old_snapshot.version,
45 };
46
47 if old_snapshot.fold_snapshot.version != new_snapshot.fold_snapshot.version {
48 new_snapshot.version += 1;
49 }
50
51 let mut tab_edits = Vec::with_capacity(fold_edits.len());
52
53 if old_snapshot.tab_size == new_snapshot.tab_size {
54 // Expand each edit to include the next tab on the same line as the edit,
55 // and any subsequent tabs on that line that moved across the tab expansion
56 // boundary.
57 for fold_edit in &mut fold_edits {
58 let old_end = fold_edit.old.end.to_point(&old_snapshot.fold_snapshot);
59 let old_end_row_successor_offset = cmp::min(
60 FoldPoint::new(old_end.row() + 1, 0),
61 old_snapshot.fold_snapshot.max_point(),
62 )
63 .to_offset(&old_snapshot.fold_snapshot);
64 let new_end = fold_edit.new.end.to_point(&new_snapshot.fold_snapshot);
65
66 let mut offset_from_edit = 0;
67 let mut first_tab_offset = None;
68 let mut last_tab_with_changed_expansion_offset = None;
69 'outer: for chunk in old_snapshot.fold_snapshot.chunks(
70 fold_edit.old.end..old_end_row_successor_offset,
71 false,
72 None,
73 None,
74 ) {
75 for (ix, _) in chunk.text.match_indices('\t') {
76 let offset_from_edit = offset_from_edit + (ix as u32);
77 if first_tab_offset.is_none() {
78 first_tab_offset = Some(offset_from_edit);
79 }
80
81 let old_column = old_end.column() + offset_from_edit;
82 let new_column = new_end.column() + offset_from_edit;
83 let was_expanded = old_column < old_snapshot.max_expansion_column;
84 let is_expanded = new_column < new_snapshot.max_expansion_column;
85 if was_expanded != is_expanded {
86 last_tab_with_changed_expansion_offset = Some(offset_from_edit);
87 } else if !was_expanded && !is_expanded {
88 break 'outer;
89 }
90 }
91
92 offset_from_edit += chunk.text.len() as u32;
93 if old_end.column() + offset_from_edit >= old_snapshot.max_expansion_column
94 && new_end.column() + offset_from_edit >= new_snapshot.max_expansion_column
95 {
96 break;
97 }
98 }
99
100 if let Some(offset) = last_tab_with_changed_expansion_offset.or(first_tab_offset) {
101 fold_edit.old.end.0 += offset as usize + 1;
102 fold_edit.new.end.0 += offset as usize + 1;
103 }
104 }
105
106 // Combine any edits that overlap due to the expansion.
107 let mut ix = 1;
108 while ix < fold_edits.len() {
109 let (prev_edits, next_edits) = fold_edits.split_at_mut(ix);
110 let prev_edit = prev_edits.last_mut().unwrap();
111 let edit = &next_edits[0];
112 if prev_edit.old.end >= edit.old.start {
113 prev_edit.old.end = edit.old.end;
114 prev_edit.new.end = edit.new.end;
115 fold_edits.remove(ix);
116 } else {
117 ix += 1;
118 }
119 }
120
121 for fold_edit in fold_edits {
122 let old_start = fold_edit.old.start.to_point(&old_snapshot.fold_snapshot);
123 let old_end = fold_edit.old.end.to_point(&old_snapshot.fold_snapshot);
124 let new_start = fold_edit.new.start.to_point(&new_snapshot.fold_snapshot);
125 let new_end = fold_edit.new.end.to_point(&new_snapshot.fold_snapshot);
126 tab_edits.push(TabEdit {
127 old: old_snapshot.to_tab_point(old_start)..old_snapshot.to_tab_point(old_end),
128 new: new_snapshot.to_tab_point(new_start)..new_snapshot.to_tab_point(new_end),
129 });
130 }
131 } else {
132 new_snapshot.version += 1;
133 tab_edits.push(TabEdit {
134 old: TabPoint::zero()..old_snapshot.max_point(),
135 new: TabPoint::zero()..new_snapshot.max_point(),
136 });
137 }
138
139 *old_snapshot = new_snapshot;
140 (old_snapshot.clone(), tab_edits)
141 }
142}
143
144#[derive(Clone)]
145pub struct TabSnapshot {
146 pub fold_snapshot: FoldSnapshot,
147 pub tab_size: NonZeroU32,
148 pub max_expansion_column: u32,
149 pub version: usize,
150}
151
152impl TabSnapshot {
153 pub fn buffer_snapshot(&self) -> &MultiBufferSnapshot {
154 &self.fold_snapshot.inlay_snapshot.buffer
155 }
156
157 pub fn line_len(&self, row: u32) -> u32 {
158 let max_point = self.max_point();
159 if row < max_point.row() {
160 self.to_tab_point(FoldPoint::new(row, self.fold_snapshot.line_len(row)))
161 .0
162 .column
163 } else {
164 max_point.column()
165 }
166 }
167
168 pub fn text_summary(&self) -> TextSummary {
169 self.text_summary_for_range(TabPoint::zero()..self.max_point())
170 }
171
172 pub fn text_summary_for_range(&self, range: Range<TabPoint>) -> TextSummary {
173 let input_start = self.to_fold_point(range.start, Bias::Left).0;
174 let input_end = self.to_fold_point(range.end, Bias::Right).0;
175 let input_summary = self
176 .fold_snapshot
177 .text_summary_for_range(input_start..input_end);
178
179 let mut first_line_chars = 0;
180 let line_end = if range.start.row() == range.end.row() {
181 range.end
182 } else {
183 self.max_point()
184 };
185 for c in self
186 .chunks(range.start..line_end, false, None, None)
187 .flat_map(|chunk| chunk.text.chars())
188 {
189 if c == '\n' {
190 break;
191 }
192 first_line_chars += 1;
193 }
194
195 let mut last_line_chars = 0;
196 if range.start.row() == range.end.row() {
197 last_line_chars = first_line_chars;
198 } else {
199 for _ in self
200 .chunks(
201 TabPoint::new(range.end.row(), 0)..range.end,
202 false,
203 None,
204 None,
205 )
206 .flat_map(|chunk| chunk.text.chars())
207 {
208 last_line_chars += 1;
209 }
210 }
211
212 TextSummary {
213 lines: range.end.0 - range.start.0,
214 first_line_chars,
215 last_line_chars,
216 longest_row: input_summary.longest_row,
217 longest_row_chars: input_summary.longest_row_chars,
218 }
219 }
220
221 pub fn chunks<'a>(
222 &'a self,
223 range: Range<TabPoint>,
224 language_aware: bool,
225 text_highlights: Option<&'a TextHighlights>,
226 inlay_highlights: Option<HighlightStyle>,
227 ) -> TabChunks<'a> {
228 let (input_start, expanded_char_column, to_next_stop) =
229 self.to_fold_point(range.start, Bias::Left);
230 let input_column = input_start.column();
231 let input_start = input_start.to_offset(&self.fold_snapshot);
232 let input_end = self
233 .to_fold_point(range.end, Bias::Right)
234 .0
235 .to_offset(&self.fold_snapshot);
236 let to_next_stop = if range.start.0 + Point::new(0, to_next_stop) > range.end.0 {
237 range.end.column() - range.start.column()
238 } else {
239 to_next_stop
240 };
241
242 TabChunks {
243 fold_chunks: self.fold_snapshot.chunks(
244 input_start..input_end,
245 language_aware,
246 text_highlights,
247 inlay_highlights,
248 ),
249 input_column,
250 column: expanded_char_column,
251 max_expansion_column: self.max_expansion_column,
252 output_position: range.start.0,
253 max_output_position: range.end.0,
254 tab_size: self.tab_size,
255 chunk: Chunk {
256 text: &SPACES[0..(to_next_stop as usize)],
257 is_tab: true,
258 ..Default::default()
259 },
260 inside_leading_tab: to_next_stop > 0,
261 }
262 }
263
264 pub fn buffer_rows(&self, row: u32) -> fold_map::FoldBufferRows<'_> {
265 self.fold_snapshot.buffer_rows(row)
266 }
267
268 #[cfg(test)]
269 pub fn text(&self) -> String {
270 self.chunks(TabPoint::zero()..self.max_point(), false, None, None)
271 .map(|chunk| chunk.text)
272 .collect()
273 }
274
275 pub fn max_point(&self) -> TabPoint {
276 self.to_tab_point(self.fold_snapshot.max_point())
277 }
278
279 pub fn clip_point(&self, point: TabPoint, bias: Bias) -> TabPoint {
280 self.to_tab_point(
281 self.fold_snapshot
282 .clip_point(self.to_fold_point(point, bias).0, bias),
283 )
284 }
285
286 pub fn to_tab_point(&self, input: FoldPoint) -> TabPoint {
287 let chars = self.fold_snapshot.chars_at(FoldPoint::new(input.row(), 0));
288 let expanded = self.expand_tabs(chars, input.column());
289 TabPoint::new(input.row(), expanded)
290 }
291
292 pub fn to_fold_point(&self, output: TabPoint, bias: Bias) -> (FoldPoint, u32, u32) {
293 let chars = self.fold_snapshot.chars_at(FoldPoint::new(output.row(), 0));
294 let expanded = output.column();
295 let (collapsed, expanded_char_column, to_next_stop) =
296 self.collapse_tabs(chars, expanded, bias);
297 (
298 FoldPoint::new(output.row(), collapsed as u32),
299 expanded_char_column,
300 to_next_stop,
301 )
302 }
303
304 pub fn make_tab_point(&self, point: Point, bias: Bias) -> TabPoint {
305 let inlay_point = self.fold_snapshot.inlay_snapshot.to_inlay_point(point);
306 let fold_point = self.fold_snapshot.to_fold_point(inlay_point, bias);
307 self.to_tab_point(fold_point)
308 }
309
310 pub fn to_point(&self, point: TabPoint, bias: Bias) -> Point {
311 let fold_point = self.to_fold_point(point, bias).0;
312 let inlay_point = fold_point.to_inlay_point(&self.fold_snapshot);
313 self.fold_snapshot
314 .inlay_snapshot
315 .to_buffer_point(inlay_point)
316 }
317
318 fn expand_tabs(&self, chars: impl Iterator<Item = char>, column: u32) -> u32 {
319 let tab_size = self.tab_size.get();
320
321 let mut expanded_chars = 0;
322 let mut expanded_bytes = 0;
323 let mut collapsed_bytes = 0;
324 let end_column = column.min(self.max_expansion_column);
325 for c in chars {
326 if collapsed_bytes >= end_column {
327 break;
328 }
329 if c == '\t' {
330 let tab_len = tab_size - expanded_chars % tab_size;
331 expanded_bytes += tab_len;
332 expanded_chars += tab_len;
333 } else {
334 expanded_bytes += c.len_utf8() as u32;
335 expanded_chars += 1;
336 }
337 collapsed_bytes += c.len_utf8() as u32;
338 }
339 expanded_bytes + column.saturating_sub(collapsed_bytes)
340 }
341
342 fn collapse_tabs(
343 &self,
344 chars: impl Iterator<Item = char>,
345 column: u32,
346 bias: Bias,
347 ) -> (u32, u32, u32) {
348 let tab_size = self.tab_size.get();
349
350 let mut expanded_bytes = 0;
351 let mut expanded_chars = 0;
352 let mut collapsed_bytes = 0;
353 for c in chars {
354 if expanded_bytes >= column {
355 break;
356 }
357 if collapsed_bytes >= self.max_expansion_column {
358 break;
359 }
360
361 if c == '\t' {
362 let tab_len = tab_size - (expanded_chars % tab_size);
363 expanded_chars += tab_len;
364 expanded_bytes += tab_len;
365 if expanded_bytes > column {
366 expanded_chars -= expanded_bytes - column;
367 return match bias {
368 Bias::Left => (collapsed_bytes, expanded_chars, expanded_bytes - column),
369 Bias::Right => (collapsed_bytes + 1, expanded_chars, 0),
370 };
371 }
372 } else {
373 expanded_chars += 1;
374 expanded_bytes += c.len_utf8() as u32;
375 }
376
377 if expanded_bytes > column && matches!(bias, Bias::Left) {
378 expanded_chars -= 1;
379 break;
380 }
381
382 collapsed_bytes += c.len_utf8() as u32;
383 }
384 (
385 collapsed_bytes + column.saturating_sub(expanded_bytes),
386 expanded_chars,
387 0,
388 )
389 }
390}
391
392#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
393pub struct TabPoint(pub Point);
394
395impl TabPoint {
396 pub fn new(row: u32, column: u32) -> Self {
397 Self(Point::new(row, column))
398 }
399
400 pub fn zero() -> Self {
401 Self::new(0, 0)
402 }
403
404 pub fn row(self) -> u32 {
405 self.0.row
406 }
407
408 pub fn column(self) -> u32 {
409 self.0.column
410 }
411}
412
413impl From<Point> for TabPoint {
414 fn from(point: Point) -> Self {
415 Self(point)
416 }
417}
418
419pub type TabEdit = text::Edit<TabPoint>;
420
421#[derive(Clone, Debug, Default, Eq, PartialEq)]
422pub struct TextSummary {
423 pub lines: Point,
424 pub first_line_chars: u32,
425 pub last_line_chars: u32,
426 pub longest_row: u32,
427 pub longest_row_chars: u32,
428}
429
430impl<'a> From<&'a str> for TextSummary {
431 fn from(text: &'a str) -> Self {
432 let sum = text::TextSummary::from(text);
433
434 TextSummary {
435 lines: sum.lines,
436 first_line_chars: sum.first_line_chars,
437 last_line_chars: sum.last_line_chars,
438 longest_row: sum.longest_row,
439 longest_row_chars: sum.longest_row_chars,
440 }
441 }
442}
443
444impl<'a> std::ops::AddAssign<&'a Self> for TextSummary {
445 fn add_assign(&mut self, other: &'a Self) {
446 let joined_chars = self.last_line_chars + other.first_line_chars;
447 if joined_chars > self.longest_row_chars {
448 self.longest_row = self.lines.row;
449 self.longest_row_chars = joined_chars;
450 }
451 if other.longest_row_chars > self.longest_row_chars {
452 self.longest_row = self.lines.row + other.longest_row;
453 self.longest_row_chars = other.longest_row_chars;
454 }
455
456 if self.lines.row == 0 {
457 self.first_line_chars += other.first_line_chars;
458 }
459
460 if other.lines.row == 0 {
461 self.last_line_chars += other.first_line_chars;
462 } else {
463 self.last_line_chars = other.last_line_chars;
464 }
465
466 self.lines += &other.lines;
467 }
468}
469
470// Handles a tab width <= 16
471const SPACES: &str = " ";
472
473pub struct TabChunks<'a> {
474 fold_chunks: FoldChunks<'a>,
475 chunk: Chunk<'a>,
476 column: u32,
477 max_expansion_column: u32,
478 output_position: Point,
479 input_column: u32,
480 max_output_position: Point,
481 tab_size: NonZeroU32,
482 inside_leading_tab: bool,
483}
484
485impl<'a> Iterator for TabChunks<'a> {
486 type Item = Chunk<'a>;
487
488 fn next(&mut self) -> Option<Self::Item> {
489 if self.chunk.text.is_empty() {
490 if let Some(chunk) = self.fold_chunks.next() {
491 self.chunk = chunk;
492 if self.inside_leading_tab {
493 self.chunk.text = &self.chunk.text[1..];
494 self.inside_leading_tab = false;
495 self.input_column += 1;
496 }
497 } else {
498 return None;
499 }
500 }
501
502 for (ix, c) in self.chunk.text.char_indices() {
503 match c {
504 '\t' => {
505 if ix > 0 {
506 let (prefix, suffix) = self.chunk.text.split_at(ix);
507 self.chunk.text = suffix;
508 return Some(Chunk {
509 text: prefix,
510 ..self.chunk
511 });
512 } else {
513 self.chunk.text = &self.chunk.text[1..];
514 let tab_size = if self.input_column < self.max_expansion_column {
515 self.tab_size.get() as u32
516 } else {
517 1
518 };
519 let mut len = tab_size - self.column % tab_size;
520 let next_output_position = cmp::min(
521 self.output_position + Point::new(0, len),
522 self.max_output_position,
523 );
524 len = next_output_position.column - self.output_position.column;
525 self.column += len;
526 self.input_column += 1;
527 self.output_position = next_output_position;
528 return Some(Chunk {
529 text: &SPACES[..len as usize],
530 is_tab: true,
531 ..self.chunk
532 });
533 }
534 }
535 '\n' => {
536 self.column = 0;
537 self.input_column = 0;
538 self.output_position += Point::new(1, 0);
539 }
540 _ => {
541 self.column += 1;
542 if !self.inside_leading_tab {
543 self.input_column += c.len_utf8() as u32;
544 }
545 self.output_position.column += c.len_utf8() as u32;
546 }
547 }
548 }
549
550 Some(mem::take(&mut self.chunk))
551 }
552}
553
554#[cfg(test)]
555mod tests {
556 use super::*;
557 use crate::{
558 display_map::{fold_map::FoldMap, inlay_map::InlayMap},
559 MultiBuffer,
560 };
561 use rand::{prelude::StdRng, Rng};
562
563 #[gpui::test]
564 fn test_expand_tabs(cx: &mut gpui::AppContext) {
565 let buffer = MultiBuffer::build_simple("", cx);
566 let buffer_snapshot = buffer.read(cx).snapshot(cx);
567 let (_, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
568 let (_, fold_snapshot) = FoldMap::new(inlay_snapshot);
569 let (_, tab_snapshot) = TabMap::new(fold_snapshot, 4.try_into().unwrap());
570
571 assert_eq!(tab_snapshot.expand_tabs("\t".chars(), 0), 0);
572 assert_eq!(tab_snapshot.expand_tabs("\t".chars(), 1), 4);
573 assert_eq!(tab_snapshot.expand_tabs("\ta".chars(), 2), 5);
574 }
575
576 #[gpui::test]
577 fn test_long_lines(cx: &mut gpui::AppContext) {
578 let max_expansion_column = 12;
579 let input = "A\tBC\tDEF\tG\tHI\tJ\tK\tL\tM";
580 let output = "A BC DEF G HI J K L M";
581
582 let buffer = MultiBuffer::build_simple(input, cx);
583 let buffer_snapshot = buffer.read(cx).snapshot(cx);
584 let (_, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
585 let (_, fold_snapshot) = FoldMap::new(inlay_snapshot);
586 let (_, mut tab_snapshot) = TabMap::new(fold_snapshot, 4.try_into().unwrap());
587
588 tab_snapshot.max_expansion_column = max_expansion_column;
589 assert_eq!(tab_snapshot.text(), output);
590
591 for (ix, c) in input.char_indices() {
592 assert_eq!(
593 tab_snapshot
594 .chunks(
595 TabPoint::new(0, ix as u32)..tab_snapshot.max_point(),
596 false,
597 None,
598 None,
599 )
600 .map(|c| c.text)
601 .collect::<String>(),
602 &output[ix..],
603 "text from index {ix}"
604 );
605
606 if c != '\t' {
607 let input_point = Point::new(0, ix as u32);
608 let output_point = Point::new(0, output.find(c).unwrap() as u32);
609 assert_eq!(
610 tab_snapshot.to_tab_point(FoldPoint(input_point)),
611 TabPoint(output_point),
612 "to_tab_point({input_point:?})"
613 );
614 assert_eq!(
615 tab_snapshot
616 .to_fold_point(TabPoint(output_point), Bias::Left)
617 .0,
618 FoldPoint(input_point),
619 "to_fold_point({output_point:?})"
620 );
621 }
622 }
623 }
624
625 #[gpui::test]
626 fn test_long_lines_with_character_spanning_max_expansion_column(cx: &mut gpui::AppContext) {
627 let max_expansion_column = 8;
628 let input = "abcdefg⋯hij";
629
630 let buffer = MultiBuffer::build_simple(input, cx);
631 let buffer_snapshot = buffer.read(cx).snapshot(cx);
632 let (_, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
633 let (_, fold_snapshot) = FoldMap::new(inlay_snapshot);
634 let (_, mut tab_snapshot) = TabMap::new(fold_snapshot, 4.try_into().unwrap());
635
636 tab_snapshot.max_expansion_column = max_expansion_column;
637 assert_eq!(tab_snapshot.text(), input);
638 }
639
640 #[gpui::test]
641 fn test_marking_tabs(cx: &mut gpui::AppContext) {
642 let input = "\t \thello";
643
644 let buffer = MultiBuffer::build_simple(&input, cx);
645 let buffer_snapshot = buffer.read(cx).snapshot(cx);
646 let (_, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
647 let (_, fold_snapshot) = FoldMap::new(inlay_snapshot);
648 let (_, tab_snapshot) = TabMap::new(fold_snapshot, 4.try_into().unwrap());
649
650 assert_eq!(
651 chunks(&tab_snapshot, TabPoint::zero()),
652 vec![
653 (" ".to_string(), true),
654 (" ".to_string(), false),
655 (" ".to_string(), true),
656 ("hello".to_string(), false),
657 ]
658 );
659 assert_eq!(
660 chunks(&tab_snapshot, TabPoint::new(0, 2)),
661 vec![
662 (" ".to_string(), true),
663 (" ".to_string(), false),
664 (" ".to_string(), true),
665 ("hello".to_string(), false),
666 ]
667 );
668
669 fn chunks(snapshot: &TabSnapshot, start: TabPoint) -> Vec<(String, bool)> {
670 let mut chunks = Vec::new();
671 let mut was_tab = false;
672 let mut text = String::new();
673 for chunk in snapshot.chunks(start..snapshot.max_point(), false, None, None) {
674 if chunk.is_tab != was_tab {
675 if !text.is_empty() {
676 chunks.push((mem::take(&mut text), was_tab));
677 }
678 was_tab = chunk.is_tab;
679 }
680 text.push_str(chunk.text);
681 }
682
683 if !text.is_empty() {
684 chunks.push((text, was_tab));
685 }
686 chunks
687 }
688 }
689
690 #[gpui::test(iterations = 100)]
691 fn test_random_tabs(cx: &mut gpui::AppContext, mut rng: StdRng) {
692 let tab_size = NonZeroU32::new(rng.gen_range(1..=4)).unwrap();
693 let len = rng.gen_range(0..30);
694 let buffer = if rng.gen() {
695 let text = util::RandomCharIter::new(&mut rng)
696 .take(len)
697 .collect::<String>();
698 MultiBuffer::build_simple(&text, cx)
699 } else {
700 MultiBuffer::build_random(&mut rng, cx)
701 };
702 let buffer_snapshot = buffer.read(cx).snapshot(cx);
703 log::info!("Buffer text: {:?}", buffer_snapshot.text());
704
705 let (mut inlay_map, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
706 log::info!("InlayMap text: {:?}", inlay_snapshot.text());
707 let (mut fold_map, _) = FoldMap::new(inlay_snapshot.clone());
708 fold_map.randomly_mutate(&mut rng);
709 let (fold_snapshot, _) = fold_map.read(inlay_snapshot, vec![]);
710 log::info!("FoldMap text: {:?}", fold_snapshot.text());
711 let (inlay_snapshot, _) = inlay_map.randomly_mutate(&mut 0, &mut rng);
712 log::info!("InlayMap text: {:?}", inlay_snapshot.text());
713
714 let (tab_map, _) = TabMap::new(fold_snapshot.clone(), tab_size);
715 let tabs_snapshot = tab_map.set_max_expansion_column(32);
716
717 let text = text::Rope::from(tabs_snapshot.text().as_str());
718 log::info!(
719 "TabMap text (tab size: {}): {:?}",
720 tab_size,
721 tabs_snapshot.text(),
722 );
723
724 for _ in 0..5 {
725 let end_row = rng.gen_range(0..=text.max_point().row);
726 let end_column = rng.gen_range(0..=text.line_len(end_row));
727 let mut end = TabPoint(text.clip_point(Point::new(end_row, end_column), Bias::Right));
728 let start_row = rng.gen_range(0..=text.max_point().row);
729 let start_column = rng.gen_range(0..=text.line_len(start_row));
730 let mut start =
731 TabPoint(text.clip_point(Point::new(start_row, start_column), Bias::Left));
732 if start > end {
733 mem::swap(&mut start, &mut end);
734 }
735
736 let expected_text = text
737 .chunks_in_range(text.point_to_offset(start.0)..text.point_to_offset(end.0))
738 .collect::<String>();
739 let expected_summary = TextSummary::from(expected_text.as_str());
740 assert_eq!(
741 tabs_snapshot
742 .chunks(start..end, false, None, None)
743 .map(|c| c.text)
744 .collect::<String>(),
745 expected_text,
746 "chunks({:?}..{:?})",
747 start,
748 end
749 );
750
751 let mut actual_summary = tabs_snapshot.text_summary_for_range(start..end);
752 if tab_size.get() > 1 && inlay_snapshot.text().contains('\t') {
753 actual_summary.longest_row = expected_summary.longest_row;
754 actual_summary.longest_row_chars = expected_summary.longest_row_chars;
755 }
756 assert_eq!(actual_summary, expected_summary);
757 }
758
759 for row in 0..=text.max_point().row {
760 assert_eq!(
761 tabs_snapshot.line_len(row),
762 text.line_len(row),
763 "line_len({row})"
764 );
765 }
766 }
767}