1use super::{network::Network, *};
2use clock::ReplicaId;
3use rand::prelude::*;
4use std::{
5 cmp::Ordering,
6 env,
7 iter::Iterator,
8 time::{Duration, Instant},
9};
10
11#[cfg(test)]
12#[ctor::ctor]
13fn init_logger() {
14 if std::env::var("RUST_LOG").is_ok() {
15 env_logger::init();
16 }
17}
18
19#[test]
20fn test_edit() {
21 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "abc".into());
22 assert_eq!(buffer.text(), "abc");
23 buffer.edit([(3..3, "def")]);
24 assert_eq!(buffer.text(), "abcdef");
25 buffer.edit([(0..0, "ghi")]);
26 assert_eq!(buffer.text(), "ghiabcdef");
27 buffer.edit([(5..5, "jkl")]);
28 assert_eq!(buffer.text(), "ghiabjklcdef");
29 buffer.edit([(6..7, "")]);
30 assert_eq!(buffer.text(), "ghiabjlcdef");
31 buffer.edit([(4..9, "mno")]);
32 assert_eq!(buffer.text(), "ghiamnoef");
33}
34
35#[gpui::test(iterations = 100)]
36fn test_random_edits(mut rng: StdRng) {
37 let operations = env::var("OPERATIONS")
38 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
39 .unwrap_or(10);
40
41 let reference_string_len = rng.gen_range(0..3);
42 let mut reference_string = RandomCharIter::new(&mut rng)
43 .take(reference_string_len)
44 .collect::<String>();
45 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), reference_string.clone());
46 LineEnding::normalize(&mut reference_string);
47
48 buffer.set_group_interval(Duration::from_millis(rng.gen_range(0..=200)));
49 let mut buffer_versions = Vec::new();
50 log::info!(
51 "buffer text {:?}, version: {:?}",
52 buffer.text(),
53 buffer.version()
54 );
55
56 for _i in 0..operations {
57 let (edits, _) = buffer.randomly_edit(&mut rng, 5);
58 for (old_range, new_text) in edits.iter().rev() {
59 reference_string.replace_range(old_range.clone(), new_text);
60 }
61
62 assert_eq!(buffer.text(), reference_string);
63 log::info!(
64 "buffer text {:?}, version: {:?}",
65 buffer.text(),
66 buffer.version()
67 );
68
69 if rng.gen_bool(0.25) {
70 buffer.randomly_undo_redo(&mut rng);
71 reference_string = buffer.text();
72 log::info!(
73 "buffer text {:?}, version: {:?}",
74 buffer.text(),
75 buffer.version()
76 );
77 }
78
79 let range = buffer.random_byte_range(0, &mut rng);
80 assert_eq!(
81 buffer.text_summary_for_range::<TextSummary, _>(range.clone()),
82 TextSummary::from(&reference_string[range])
83 );
84
85 buffer.check_invariants();
86
87 if rng.gen_bool(0.3) {
88 buffer_versions.push((buffer.clone(), buffer.subscribe()));
89 }
90 }
91
92 for (old_buffer, subscription) in buffer_versions {
93 let edits = buffer
94 .edits_since::<usize>(&old_buffer.version)
95 .collect::<Vec<_>>();
96
97 log::info!(
98 "applying edits since version {:?} to old text: {:?}: {:?}",
99 old_buffer.version(),
100 old_buffer.text(),
101 edits,
102 );
103
104 let mut text = old_buffer.visible_text.clone();
105 for edit in edits {
106 let new_text: String = buffer.text_for_range(edit.new.clone()).collect();
107 text.replace(edit.new.start..edit.new.start + edit.old.len(), &new_text);
108 }
109 assert_eq!(text.to_string(), buffer.text());
110
111 assert_eq!(
112 buffer.rope_for_version(old_buffer.version()).to_string(),
113 old_buffer.text()
114 );
115
116 for _ in 0..5 {
117 let end_ix = old_buffer.clip_offset(rng.gen_range(0..=old_buffer.len()), Bias::Right);
118 let start_ix = old_buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
119 let range = old_buffer.anchor_before(start_ix)..old_buffer.anchor_after(end_ix);
120 let mut old_text = old_buffer.text_for_range(range.clone()).collect::<String>();
121 let edits = buffer
122 .edits_since_in_range::<usize>(&old_buffer.version, range.clone())
123 .collect::<Vec<_>>();
124 log::info!(
125 "applying edits since version {:?} to old text in range {:?}: {:?}: {:?}",
126 old_buffer.version(),
127 start_ix..end_ix,
128 old_text,
129 edits,
130 );
131
132 let new_text = buffer.text_for_range(range).collect::<String>();
133 for edit in edits {
134 old_text.replace_range(
135 edit.new.start..edit.new.start + edit.old_len(),
136 &new_text[edit.new],
137 );
138 }
139 assert_eq!(old_text, new_text);
140 }
141
142 assert_eq!(
143 buffer.has_edits_since(&old_buffer.version),
144 buffer
145 .edits_since::<usize>(&old_buffer.version)
146 .next()
147 .is_some(),
148 );
149
150 let subscription_edits = subscription.consume();
151 log::info!(
152 "applying subscription edits since version {:?} to old text: {:?}: {:?}",
153 old_buffer.version(),
154 old_buffer.text(),
155 subscription_edits,
156 );
157
158 let mut text = old_buffer.visible_text.clone();
159 for edit in subscription_edits.into_inner() {
160 let new_text: String = buffer.text_for_range(edit.new.clone()).collect();
161 text.replace(edit.new.start..edit.new.start + edit.old.len(), &new_text);
162 }
163 assert_eq!(text.to_string(), buffer.text());
164 }
165}
166
167#[test]
168fn test_line_endings() {
169 assert_eq!(LineEnding::detect(&"🍐✅\n".repeat(1000)), LineEnding::Unix);
170 assert_eq!(LineEnding::detect(&"abcd\n".repeat(1000)), LineEnding::Unix);
171 assert_eq!(
172 LineEnding::detect(&"🍐✅\r\n".repeat(1000)),
173 LineEnding::Windows
174 );
175 assert_eq!(
176 LineEnding::detect(&"abcd\r\n".repeat(1000)),
177 LineEnding::Windows
178 );
179
180 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "one\r\ntwo\rthree".into());
181 assert_eq!(buffer.text(), "one\ntwo\nthree");
182 assert_eq!(buffer.line_ending(), LineEnding::Windows);
183 buffer.check_invariants();
184
185 buffer.edit([(buffer.len()..buffer.len(), "\r\nfour")]);
186 buffer.edit([(0..0, "zero\r\n")]);
187 assert_eq!(buffer.text(), "zero\none\ntwo\nthree\nfour");
188 assert_eq!(buffer.line_ending(), LineEnding::Windows);
189 buffer.check_invariants();
190}
191
192#[test]
193fn test_line_len() {
194 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "".into());
195 buffer.edit([(0..0, "abcd\nefg\nhij")]);
196 buffer.edit([(12..12, "kl\nmno")]);
197 buffer.edit([(18..18, "\npqrs\n")]);
198 buffer.edit([(18..21, "\nPQ")]);
199
200 assert_eq!(buffer.line_len(0), 4);
201 assert_eq!(buffer.line_len(1), 3);
202 assert_eq!(buffer.line_len(2), 5);
203 assert_eq!(buffer.line_len(3), 3);
204 assert_eq!(buffer.line_len(4), 4);
205 assert_eq!(buffer.line_len(5), 0);
206}
207
208#[test]
209fn test_common_prefix_at_position() {
210 let text = "a = str; b = δα";
211 let buffer = Buffer::new(0, BufferId::new(1).unwrap(), text.into());
212
213 let offset1 = offset_after(text, "str");
214 let offset2 = offset_after(text, "δα");
215
216 // the preceding word is a prefix of the suggestion
217 assert_eq!(
218 buffer.common_prefix_at(offset1, "string"),
219 range_of(text, "str"),
220 );
221 // a suffix of the preceding word is a prefix of the suggestion
222 assert_eq!(
223 buffer.common_prefix_at(offset1, "tree"),
224 range_of(text, "tr"),
225 );
226 // the preceding word is a substring of the suggestion, but not a prefix
227 assert_eq!(
228 buffer.common_prefix_at(offset1, "astro"),
229 empty_range_after(text, "str"),
230 );
231
232 // prefix matching is case insensitive.
233 assert_eq!(
234 buffer.common_prefix_at(offset1, "Strαngε"),
235 range_of(text, "str"),
236 );
237 assert_eq!(
238 buffer.common_prefix_at(offset2, "ΔΑΜΝ"),
239 range_of(text, "δα"),
240 );
241
242 fn offset_after(text: &str, part: &str) -> usize {
243 text.find(part).unwrap() + part.len()
244 }
245
246 fn empty_range_after(text: &str, part: &str) -> Range<usize> {
247 let offset = offset_after(text, part);
248 offset..offset
249 }
250
251 fn range_of(text: &str, part: &str) -> Range<usize> {
252 let start = text.find(part).unwrap();
253 start..start + part.len()
254 }
255}
256
257#[test]
258fn test_text_summary_for_range() {
259 let buffer = Buffer::new(
260 0,
261 BufferId::new(1).unwrap(),
262 "ab\nefg\nhklm\nnopqrs\ntuvwxyz".into(),
263 );
264 assert_eq!(
265 buffer.text_summary_for_range::<TextSummary, _>(1..3),
266 TextSummary {
267 len: 2,
268 len_utf16: OffsetUtf16(2),
269 lines: Point::new(1, 0),
270 first_line_chars: 1,
271 last_line_chars: 0,
272 last_line_len_utf16: 0,
273 longest_row: 0,
274 longest_row_chars: 1,
275 }
276 );
277 assert_eq!(
278 buffer.text_summary_for_range::<TextSummary, _>(1..12),
279 TextSummary {
280 len: 11,
281 len_utf16: OffsetUtf16(11),
282 lines: Point::new(3, 0),
283 first_line_chars: 1,
284 last_line_chars: 0,
285 last_line_len_utf16: 0,
286 longest_row: 2,
287 longest_row_chars: 4,
288 }
289 );
290 assert_eq!(
291 buffer.text_summary_for_range::<TextSummary, _>(0..20),
292 TextSummary {
293 len: 20,
294 len_utf16: OffsetUtf16(20),
295 lines: Point::new(4, 1),
296 first_line_chars: 2,
297 last_line_chars: 1,
298 last_line_len_utf16: 1,
299 longest_row: 3,
300 longest_row_chars: 6,
301 }
302 );
303 assert_eq!(
304 buffer.text_summary_for_range::<TextSummary, _>(0..22),
305 TextSummary {
306 len: 22,
307 len_utf16: OffsetUtf16(22),
308 lines: Point::new(4, 3),
309 first_line_chars: 2,
310 last_line_chars: 3,
311 last_line_len_utf16: 3,
312 longest_row: 3,
313 longest_row_chars: 6,
314 }
315 );
316 assert_eq!(
317 buffer.text_summary_for_range::<TextSummary, _>(7..22),
318 TextSummary {
319 len: 15,
320 len_utf16: OffsetUtf16(15),
321 lines: Point::new(2, 3),
322 first_line_chars: 4,
323 last_line_chars: 3,
324 last_line_len_utf16: 3,
325 longest_row: 1,
326 longest_row_chars: 6,
327 }
328 );
329}
330
331#[test]
332fn test_chars_at() {
333 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "".into());
334 buffer.edit([(0..0, "abcd\nefgh\nij")]);
335 buffer.edit([(12..12, "kl\nmno")]);
336 buffer.edit([(18..18, "\npqrs")]);
337 buffer.edit([(18..21, "\nPQ")]);
338
339 let chars = buffer.chars_at(Point::new(0, 0));
340 assert_eq!(chars.collect::<String>(), "abcd\nefgh\nijkl\nmno\nPQrs");
341
342 let chars = buffer.chars_at(Point::new(1, 0));
343 assert_eq!(chars.collect::<String>(), "efgh\nijkl\nmno\nPQrs");
344
345 let chars = buffer.chars_at(Point::new(2, 0));
346 assert_eq!(chars.collect::<String>(), "ijkl\nmno\nPQrs");
347
348 let chars = buffer.chars_at(Point::new(3, 0));
349 assert_eq!(chars.collect::<String>(), "mno\nPQrs");
350
351 let chars = buffer.chars_at(Point::new(4, 0));
352 assert_eq!(chars.collect::<String>(), "PQrs");
353
354 // Regression test:
355 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "".into());
356 buffer.edit([(0..0, "[workspace]\nmembers = [\n \"xray_core\",\n \"xray_server\",\n \"xray_cli\",\n \"xray_wasm\",\n]\n")]);
357 buffer.edit([(60..60, "\n")]);
358
359 let chars = buffer.chars_at(Point::new(6, 0));
360 assert_eq!(chars.collect::<String>(), " \"xray_wasm\",\n]\n");
361}
362
363#[test]
364fn test_anchors() {
365 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "".into());
366 buffer.edit([(0..0, "abc")]);
367 let left_anchor = buffer.anchor_before(2);
368 let right_anchor = buffer.anchor_after(2);
369
370 buffer.edit([(1..1, "def\n")]);
371 assert_eq!(buffer.text(), "adef\nbc");
372 assert_eq!(left_anchor.to_offset(&buffer), 6);
373 assert_eq!(right_anchor.to_offset(&buffer), 6);
374 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
375 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 1 });
376
377 buffer.edit([(2..3, "")]);
378 assert_eq!(buffer.text(), "adf\nbc");
379 assert_eq!(left_anchor.to_offset(&buffer), 5);
380 assert_eq!(right_anchor.to_offset(&buffer), 5);
381 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
382 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 1 });
383
384 buffer.edit([(5..5, "ghi\n")]);
385 assert_eq!(buffer.text(), "adf\nbghi\nc");
386 assert_eq!(left_anchor.to_offset(&buffer), 5);
387 assert_eq!(right_anchor.to_offset(&buffer), 9);
388 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
389 assert_eq!(right_anchor.to_point(&buffer), Point { row: 2, column: 0 });
390
391 buffer.edit([(7..9, "")]);
392 assert_eq!(buffer.text(), "adf\nbghc");
393 assert_eq!(left_anchor.to_offset(&buffer), 5);
394 assert_eq!(right_anchor.to_offset(&buffer), 7);
395 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 },);
396 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 3 });
397
398 // Ensure anchoring to a point is equivalent to anchoring to an offset.
399 assert_eq!(
400 buffer.anchor_before(Point { row: 0, column: 0 }),
401 buffer.anchor_before(0)
402 );
403 assert_eq!(
404 buffer.anchor_before(Point { row: 0, column: 1 }),
405 buffer.anchor_before(1)
406 );
407 assert_eq!(
408 buffer.anchor_before(Point { row: 0, column: 2 }),
409 buffer.anchor_before(2)
410 );
411 assert_eq!(
412 buffer.anchor_before(Point { row: 0, column: 3 }),
413 buffer.anchor_before(3)
414 );
415 assert_eq!(
416 buffer.anchor_before(Point { row: 1, column: 0 }),
417 buffer.anchor_before(4)
418 );
419 assert_eq!(
420 buffer.anchor_before(Point { row: 1, column: 1 }),
421 buffer.anchor_before(5)
422 );
423 assert_eq!(
424 buffer.anchor_before(Point { row: 1, column: 2 }),
425 buffer.anchor_before(6)
426 );
427 assert_eq!(
428 buffer.anchor_before(Point { row: 1, column: 3 }),
429 buffer.anchor_before(7)
430 );
431 assert_eq!(
432 buffer.anchor_before(Point { row: 1, column: 4 }),
433 buffer.anchor_before(8)
434 );
435
436 // Comparison between anchors.
437 let anchor_at_offset_0 = buffer.anchor_before(0);
438 let anchor_at_offset_1 = buffer.anchor_before(1);
439 let anchor_at_offset_2 = buffer.anchor_before(2);
440
441 assert_eq!(
442 anchor_at_offset_0.cmp(&anchor_at_offset_0, &buffer),
443 Ordering::Equal
444 );
445 assert_eq!(
446 anchor_at_offset_1.cmp(&anchor_at_offset_1, &buffer),
447 Ordering::Equal
448 );
449 assert_eq!(
450 anchor_at_offset_2.cmp(&anchor_at_offset_2, &buffer),
451 Ordering::Equal
452 );
453
454 assert_eq!(
455 anchor_at_offset_0.cmp(&anchor_at_offset_1, &buffer),
456 Ordering::Less
457 );
458 assert_eq!(
459 anchor_at_offset_1.cmp(&anchor_at_offset_2, &buffer),
460 Ordering::Less
461 );
462 assert_eq!(
463 anchor_at_offset_0.cmp(&anchor_at_offset_2, &buffer),
464 Ordering::Less
465 );
466
467 assert_eq!(
468 anchor_at_offset_1.cmp(&anchor_at_offset_0, &buffer),
469 Ordering::Greater
470 );
471 assert_eq!(
472 anchor_at_offset_2.cmp(&anchor_at_offset_1, &buffer),
473 Ordering::Greater
474 );
475 assert_eq!(
476 anchor_at_offset_2.cmp(&anchor_at_offset_0, &buffer),
477 Ordering::Greater
478 );
479}
480
481#[test]
482fn test_anchors_at_start_and_end() {
483 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "".into());
484 let before_start_anchor = buffer.anchor_before(0);
485 let after_end_anchor = buffer.anchor_after(0);
486
487 buffer.edit([(0..0, "abc")]);
488 assert_eq!(buffer.text(), "abc");
489 assert_eq!(before_start_anchor.to_offset(&buffer), 0);
490 assert_eq!(after_end_anchor.to_offset(&buffer), 3);
491
492 let after_start_anchor = buffer.anchor_after(0);
493 let before_end_anchor = buffer.anchor_before(3);
494
495 buffer.edit([(3..3, "def")]);
496 buffer.edit([(0..0, "ghi")]);
497 assert_eq!(buffer.text(), "ghiabcdef");
498 assert_eq!(before_start_anchor.to_offset(&buffer), 0);
499 assert_eq!(after_start_anchor.to_offset(&buffer), 3);
500 assert_eq!(before_end_anchor.to_offset(&buffer), 6);
501 assert_eq!(after_end_anchor.to_offset(&buffer), 9);
502}
503
504#[test]
505fn test_undo_redo() {
506 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "1234".into());
507 // Set group interval to zero so as to not group edits in the undo stack.
508 buffer.set_group_interval(Duration::from_secs(0));
509
510 buffer.edit([(1..1, "abx")]);
511 buffer.edit([(3..4, "yzef")]);
512 buffer.edit([(3..5, "cd")]);
513 assert_eq!(buffer.text(), "1abcdef234");
514
515 let entries = buffer.history.undo_stack.clone();
516 assert_eq!(entries.len(), 3);
517
518 buffer.undo_or_redo(entries[0].transaction.clone());
519 assert_eq!(buffer.text(), "1cdef234");
520 buffer.undo_or_redo(entries[0].transaction.clone());
521 assert_eq!(buffer.text(), "1abcdef234");
522
523 buffer.undo_or_redo(entries[1].transaction.clone());
524 assert_eq!(buffer.text(), "1abcdx234");
525 buffer.undo_or_redo(entries[2].transaction.clone());
526 assert_eq!(buffer.text(), "1abx234");
527 buffer.undo_or_redo(entries[1].transaction.clone());
528 assert_eq!(buffer.text(), "1abyzef234");
529 buffer.undo_or_redo(entries[2].transaction.clone());
530 assert_eq!(buffer.text(), "1abcdef234");
531
532 buffer.undo_or_redo(entries[2].transaction.clone());
533 assert_eq!(buffer.text(), "1abyzef234");
534 buffer.undo_or_redo(entries[0].transaction.clone());
535 assert_eq!(buffer.text(), "1yzef234");
536 buffer.undo_or_redo(entries[1].transaction.clone());
537 assert_eq!(buffer.text(), "1234");
538}
539
540#[test]
541fn test_history() {
542 let mut now = Instant::now();
543 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "123456".into());
544 buffer.set_group_interval(Duration::from_millis(300));
545
546 let transaction_1 = buffer.start_transaction_at(now).unwrap();
547 buffer.edit([(2..4, "cd")]);
548 buffer.end_transaction_at(now);
549 assert_eq!(buffer.text(), "12cd56");
550
551 buffer.start_transaction_at(now);
552 buffer.edit([(4..5, "e")]);
553 buffer.end_transaction_at(now).unwrap();
554 assert_eq!(buffer.text(), "12cde6");
555
556 now += buffer.transaction_group_interval() + Duration::from_millis(1);
557 buffer.start_transaction_at(now);
558 buffer.edit([(0..1, "a")]);
559 buffer.edit([(1..1, "b")]);
560 buffer.end_transaction_at(now).unwrap();
561 assert_eq!(buffer.text(), "ab2cde6");
562
563 // Last transaction happened past the group interval, undo it on its own.
564 buffer.undo();
565 assert_eq!(buffer.text(), "12cde6");
566
567 // First two transactions happened within the group interval, undo them together.
568 buffer.undo();
569 assert_eq!(buffer.text(), "123456");
570
571 // Redo the first two transactions together.
572 buffer.redo();
573 assert_eq!(buffer.text(), "12cde6");
574
575 // Redo the last transaction on its own.
576 buffer.redo();
577 assert_eq!(buffer.text(), "ab2cde6");
578
579 buffer.start_transaction_at(now);
580 assert!(buffer.end_transaction_at(now).is_none());
581 buffer.undo();
582 assert_eq!(buffer.text(), "12cde6");
583
584 // Redo stack gets cleared after performing an edit.
585 buffer.start_transaction_at(now);
586 buffer.edit([(0..0, "X")]);
587 buffer.end_transaction_at(now);
588 assert_eq!(buffer.text(), "X12cde6");
589 buffer.redo();
590 assert_eq!(buffer.text(), "X12cde6");
591 buffer.undo();
592 assert_eq!(buffer.text(), "12cde6");
593 buffer.undo();
594 assert_eq!(buffer.text(), "123456");
595
596 // Transactions can be grouped manually.
597 buffer.redo();
598 buffer.redo();
599 assert_eq!(buffer.text(), "X12cde6");
600 buffer.group_until_transaction(transaction_1);
601 buffer.undo();
602 assert_eq!(buffer.text(), "123456");
603 buffer.redo();
604 assert_eq!(buffer.text(), "X12cde6");
605}
606
607#[test]
608fn test_finalize_last_transaction() {
609 let now = Instant::now();
610 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "123456".into());
611 buffer.history.group_interval = Duration::from_millis(1);
612
613 buffer.start_transaction_at(now);
614 buffer.edit([(2..4, "cd")]);
615 buffer.end_transaction_at(now);
616 assert_eq!(buffer.text(), "12cd56");
617
618 buffer.finalize_last_transaction();
619 buffer.start_transaction_at(now);
620 buffer.edit([(4..5, "e")]);
621 buffer.end_transaction_at(now).unwrap();
622 assert_eq!(buffer.text(), "12cde6");
623
624 buffer.start_transaction_at(now);
625 buffer.edit([(0..1, "a")]);
626 buffer.edit([(1..1, "b")]);
627 buffer.end_transaction_at(now).unwrap();
628 assert_eq!(buffer.text(), "ab2cde6");
629
630 buffer.undo();
631 assert_eq!(buffer.text(), "12cd56");
632
633 buffer.undo();
634 assert_eq!(buffer.text(), "123456");
635
636 buffer.redo();
637 assert_eq!(buffer.text(), "12cd56");
638
639 buffer.redo();
640 assert_eq!(buffer.text(), "ab2cde6");
641}
642
643#[test]
644fn test_edited_ranges_for_transaction() {
645 let now = Instant::now();
646 let mut buffer = Buffer::new(0, BufferId::new(1).unwrap(), "1234567".into());
647
648 buffer.start_transaction_at(now);
649 buffer.edit([(2..4, "cd")]);
650 buffer.edit([(6..6, "efg")]);
651 buffer.end_transaction_at(now);
652 assert_eq!(buffer.text(), "12cd56efg7");
653
654 let tx = buffer.finalize_last_transaction().unwrap().clone();
655 assert_eq!(
656 buffer
657 .edited_ranges_for_transaction::<usize>(&tx)
658 .collect::<Vec<_>>(),
659 [2..4, 6..9]
660 );
661
662 buffer.edit([(5..5, "hijk")]);
663 assert_eq!(buffer.text(), "12cd5hijk6efg7");
664 assert_eq!(
665 buffer
666 .edited_ranges_for_transaction::<usize>(&tx)
667 .collect::<Vec<_>>(),
668 [2..4, 10..13]
669 );
670
671 buffer.edit([(4..4, "l")]);
672 assert_eq!(buffer.text(), "12cdl5hijk6efg7");
673 assert_eq!(
674 buffer
675 .edited_ranges_for_transaction::<usize>(&tx)
676 .collect::<Vec<_>>(),
677 [2..4, 11..14]
678 );
679}
680
681#[test]
682fn test_concurrent_edits() {
683 let text = "abcdef";
684
685 let mut buffer1 = Buffer::new(1, BufferId::new(1).unwrap(), text.into());
686 let mut buffer2 = Buffer::new(2, BufferId::new(1).unwrap(), text.into());
687 let mut buffer3 = Buffer::new(3, BufferId::new(1).unwrap(), text.into());
688
689 let buf1_op = buffer1.edit([(1..2, "12")]);
690 assert_eq!(buffer1.text(), "a12cdef");
691 let buf2_op = buffer2.edit([(3..4, "34")]);
692 assert_eq!(buffer2.text(), "abc34ef");
693 let buf3_op = buffer3.edit([(5..6, "56")]);
694 assert_eq!(buffer3.text(), "abcde56");
695
696 buffer1.apply_op(buf2_op.clone());
697 buffer1.apply_op(buf3_op.clone());
698 buffer2.apply_op(buf1_op.clone());
699 buffer2.apply_op(buf3_op);
700 buffer3.apply_op(buf1_op);
701 buffer3.apply_op(buf2_op);
702
703 assert_eq!(buffer1.text(), "a12c34e56");
704 assert_eq!(buffer2.text(), "a12c34e56");
705 assert_eq!(buffer3.text(), "a12c34e56");
706}
707
708#[gpui::test(iterations = 100)]
709fn test_random_concurrent_edits(mut rng: StdRng) {
710 let peers = env::var("PEERS")
711 .map(|i| i.parse().expect("invalid `PEERS` variable"))
712 .unwrap_or(5);
713 let operations = env::var("OPERATIONS")
714 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
715 .unwrap_or(10);
716
717 let base_text_len = rng.gen_range(0..10);
718 let base_text = RandomCharIter::new(&mut rng)
719 .take(base_text_len)
720 .collect::<String>();
721 let mut replica_ids = Vec::new();
722 let mut buffers = Vec::new();
723 let mut network = Network::new(rng.clone());
724
725 for i in 0..peers {
726 let mut buffer = Buffer::new(i as ReplicaId, BufferId::new(1).unwrap(), base_text.clone());
727 buffer.history.group_interval = Duration::from_millis(rng.gen_range(0..=200));
728 buffers.push(buffer);
729 replica_ids.push(i as u16);
730 network.add_peer(i as u16);
731 }
732
733 log::info!("initial text: {:?}", base_text);
734
735 let mut mutation_count = operations;
736 loop {
737 let replica_index = rng.gen_range(0..peers);
738 let replica_id = replica_ids[replica_index];
739 let buffer = &mut buffers[replica_index];
740 match rng.gen_range(0..=100) {
741 0..=50 if mutation_count != 0 => {
742 let op = buffer.randomly_edit(&mut rng, 5).1;
743 network.broadcast(buffer.replica_id, vec![op]);
744 log::info!("buffer {} text: {:?}", buffer.replica_id, buffer.text());
745 mutation_count -= 1;
746 }
747 51..=70 if mutation_count != 0 => {
748 let ops = buffer.randomly_undo_redo(&mut rng);
749 network.broadcast(buffer.replica_id, ops);
750 mutation_count -= 1;
751 }
752 71..=100 if network.has_unreceived(replica_id) => {
753 let ops = network.receive(replica_id);
754 if !ops.is_empty() {
755 log::info!(
756 "peer {} applying {} ops from the network.",
757 replica_id,
758 ops.len()
759 );
760 buffer.apply_ops(ops);
761 }
762 }
763 _ => {}
764 }
765 buffer.check_invariants();
766
767 if mutation_count == 0 && network.is_idle() {
768 break;
769 }
770 }
771
772 let first_buffer = &buffers[0];
773 for buffer in &buffers[1..] {
774 assert_eq!(
775 buffer.text(),
776 first_buffer.text(),
777 "Replica {} text != Replica 0 text",
778 buffer.replica_id
779 );
780 buffer.check_invariants();
781 }
782}