1//! Movement module contains helper functions for calculating intended position
2//! in editor given a given motion (e.g. it handles converting a "move left" command into coordinates in editor). It is exposed mostly for use by vim crate.
3
4use super::{Bias, DisplayPoint, DisplaySnapshot, SelectionGoal, ToDisplayPoint};
5use crate::{
6 DisplayRow, EditorStyle, ToOffset, ToPoint,
7 scroll::{ScrollOffset, SharedScrollAnchor},
8};
9use gpui::{Pixels, WindowTextSystem};
10use language::{CharClassifier, Point};
11use multi_buffer::{MultiBufferOffset, MultiBufferRow, MultiBufferSnapshot};
12use serde::Deserialize;
13use workspace::searchable::Direction;
14
15use std::{ops::Range, sync::Arc};
16
17/// Defines search strategy for items in `movement` module.
18/// `FindRange::SingeLine` only looks for a match on a single line at a time, whereas
19/// `FindRange::MultiLine` keeps going until the end of a string.
20#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize)]
21pub enum FindRange {
22 SingleLine,
23 MultiLine,
24}
25
26/// TextLayoutDetails encompasses everything we need to move vertically
27/// taking into account variable width characters.
28pub struct TextLayoutDetails {
29 pub(crate) text_system: Arc<WindowTextSystem>,
30 pub(crate) editor_style: EditorStyle,
31 pub(crate) rem_size: Pixels,
32 pub scroll_anchor: SharedScrollAnchor,
33 pub visible_rows: Option<f64>,
34 pub vertical_scroll_margin: ScrollOffset,
35}
36
37/// Returns a column to the left of the current point, wrapping
38/// to the previous line if that point is at the start of line.
39pub fn left(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint {
40 if point.column() > 0 {
41 *point.column_mut() -= 1;
42 } else if point.row().0 > 0 {
43 *point.row_mut() -= 1;
44 *point.column_mut() = map.line_len(point.row());
45 }
46 map.clip_point(point, Bias::Left)
47}
48
49/// Returns a column to the left of the current point, doing nothing if
50/// that point is already at the start of line.
51pub fn saturating_left(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint {
52 if point.column() > 0 {
53 *point.column_mut() -= 1;
54 } else if point.column() == 0 {
55 // If the current sofr_wrap mode is used, the column corresponding to the display is 0,
56 // which does not necessarily mean that the actual beginning of a paragraph
57 if map.display_point_to_fold_point(point, Bias::Left).column() > 0 {
58 return left(map, point);
59 }
60 }
61 map.clip_point(point, Bias::Left)
62}
63
64/// Returns a column to the right of the current point, wrapping
65/// to the next line if that point is at the end of line.
66pub fn right(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint {
67 if point.column() < map.line_len(point.row()) {
68 *point.column_mut() += 1;
69 } else if point.row() < map.max_point().row() {
70 *point.row_mut() += 1;
71 *point.column_mut() = 0;
72 }
73 map.clip_point(point, Bias::Right)
74}
75
76/// Returns a column to the right of the current point, not performing any wrapping
77/// if that point is already at the end of line.
78pub fn saturating_right(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint {
79 *point.column_mut() += 1;
80 map.clip_point(point, Bias::Right)
81}
82
83/// Returns a display point for the preceding displayed line (which might be a soft-wrapped line).
84pub fn up(
85 map: &DisplaySnapshot,
86 start: DisplayPoint,
87 goal: SelectionGoal,
88 preserve_column_at_start: bool,
89 text_layout_details: &TextLayoutDetails,
90) -> (DisplayPoint, SelectionGoal) {
91 up_by_rows(
92 map,
93 start,
94 1,
95 goal,
96 preserve_column_at_start,
97 text_layout_details,
98 )
99}
100
101/// Returns a display point for the next displayed line (which might be a soft-wrapped line).
102pub fn down(
103 map: &DisplaySnapshot,
104 start: DisplayPoint,
105 goal: SelectionGoal,
106 preserve_column_at_end: bool,
107 text_layout_details: &TextLayoutDetails,
108) -> (DisplayPoint, SelectionGoal) {
109 down_by_rows(
110 map,
111 start,
112 1,
113 goal,
114 preserve_column_at_end,
115 text_layout_details,
116 )
117}
118
119pub(crate) fn up_by_rows(
120 map: &DisplaySnapshot,
121 start: DisplayPoint,
122 row_count: u32,
123 goal: SelectionGoal,
124 preserve_column_at_start: bool,
125 text_layout_details: &TextLayoutDetails,
126) -> (DisplayPoint, SelectionGoal) {
127 let goal_x = match goal {
128 SelectionGoal::HorizontalPosition(x) => x.into(),
129 SelectionGoal::WrappedHorizontalPosition((_, x)) => x.into(),
130 SelectionGoal::HorizontalRange { end, .. } => end.into(),
131 _ => map.x_for_display_point(start, text_layout_details),
132 };
133
134 let prev_row = DisplayRow(start.row().0.saturating_sub(row_count));
135 let mut point = map.clip_point(
136 DisplayPoint::new(prev_row, map.line_len(prev_row)),
137 Bias::Left,
138 );
139 if point.row() < start.row() {
140 *point.column_mut() = map.display_column_for_x(point.row(), goal_x, text_layout_details)
141 } else if preserve_column_at_start {
142 return (start, goal);
143 } else {
144 point = DisplayPoint::new(DisplayRow(0), 0);
145 }
146
147 let mut clipped_point = map.clip_point(point, Bias::Left);
148 if clipped_point.row() < point.row() {
149 clipped_point = map.clip_point(point, Bias::Right);
150 }
151 (
152 clipped_point,
153 SelectionGoal::HorizontalPosition(goal_x.into()),
154 )
155}
156
157pub(crate) fn down_by_rows(
158 map: &DisplaySnapshot,
159 start: DisplayPoint,
160 row_count: u32,
161 goal: SelectionGoal,
162 preserve_column_at_end: bool,
163 text_layout_details: &TextLayoutDetails,
164) -> (DisplayPoint, SelectionGoal) {
165 let goal_x = match goal {
166 SelectionGoal::HorizontalPosition(x) => x.into(),
167 SelectionGoal::WrappedHorizontalPosition((_, x)) => x.into(),
168 SelectionGoal::HorizontalRange { end, .. } => end.into(),
169 _ => map.x_for_display_point(start, text_layout_details),
170 };
171
172 let new_row = DisplayRow(start.row().0 + row_count);
173 let mut point = map.clip_point(DisplayPoint::new(new_row, 0), Bias::Right);
174 if point.row() > start.row() {
175 *point.column_mut() = map.display_column_for_x(point.row(), goal_x, text_layout_details)
176 } else if preserve_column_at_end {
177 return (start, goal);
178 } else {
179 point = map.max_point();
180 }
181
182 let mut clipped_point = map.clip_point(point, Bias::Right);
183 if clipped_point.row() > point.row() {
184 clipped_point = map.clip_point(point, Bias::Left);
185 }
186 (
187 clipped_point,
188 SelectionGoal::HorizontalPosition(goal_x.into()),
189 )
190}
191
192/// Returns a position of the start of line.
193/// If `stop_at_soft_boundaries` is true, the returned position is that of the
194/// displayed line (e.g. it could actually be in the middle of a text line if that line is soft-wrapped).
195/// Otherwise it's always going to be the start of a logical line.
196pub fn line_beginning(
197 map: &DisplaySnapshot,
198 display_point: DisplayPoint,
199 stop_at_soft_boundaries: bool,
200) -> DisplayPoint {
201 let point = display_point.to_point(map);
202 let soft_line_start = map.clip_point(DisplayPoint::new(display_point.row(), 0), Bias::Right);
203 let line_start = map.prev_line_boundary(point).1;
204
205 if stop_at_soft_boundaries && display_point != soft_line_start {
206 soft_line_start
207 } else {
208 line_start
209 }
210}
211
212/// Returns the last indented position on a given line.
213/// If `stop_at_soft_boundaries` is true, the returned [`DisplayPoint`] is that of a
214/// displayed line (e.g. if there's soft wrap it's gonna be returned),
215/// otherwise it's always going to be a start of a logical line.
216pub fn indented_line_beginning(
217 map: &DisplaySnapshot,
218 display_point: DisplayPoint,
219 stop_at_soft_boundaries: bool,
220 stop_at_indent: bool,
221) -> DisplayPoint {
222 let point = display_point.to_point(map);
223 let soft_line_start = map.clip_point(DisplayPoint::new(display_point.row(), 0), Bias::Right);
224 let indent_start = Point::new(
225 point.row,
226 map.buffer_snapshot()
227 .indent_size_for_line(MultiBufferRow(point.row))
228 .len,
229 )
230 .to_display_point(map);
231 let line_start = map.prev_line_boundary(point).1;
232
233 if stop_at_soft_boundaries && soft_line_start > indent_start && display_point != soft_line_start
234 {
235 soft_line_start
236 } else if stop_at_indent && (display_point > indent_start || display_point == line_start) {
237 indent_start
238 } else {
239 line_start
240 }
241}
242
243/// Returns a position of the end of line.
244///
245/// If `stop_at_soft_boundaries` is true, the returned position is that of the
246/// displayed line (e.g. it could actually be in the middle of a text line if that line is soft-wrapped).
247/// Otherwise it's always going to be the end of a logical line.
248pub fn line_end(
249 map: &DisplaySnapshot,
250 display_point: DisplayPoint,
251 stop_at_soft_boundaries: bool,
252) -> DisplayPoint {
253 let soft_line_end = map.clip_point(
254 DisplayPoint::new(display_point.row(), map.line_len(display_point.row())),
255 Bias::Left,
256 );
257 if stop_at_soft_boundaries && display_point != soft_line_end {
258 soft_line_end
259 } else {
260 map.next_line_boundary(display_point.to_point(map)).1
261 }
262}
263
264/// Returns a position of the previous word boundary, where a word character is defined as either
265/// uppercase letter, lowercase letter, '_' character or language-specific word character (like '-' in CSS).
266pub fn previous_word_start(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
267 let raw_point = point.to_point(map);
268 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
269
270 let mut is_first_iteration = true;
271 find_preceding_boundary_display_point(map, point, FindRange::MultiLine, &mut |left, right| {
272 // Make alt-left skip punctuation to respect VSCode behaviour. For example: hello.| goes to |hello.
273 if is_first_iteration
274 && classifier.is_punctuation(right)
275 && !classifier.is_punctuation(left)
276 && left != '\n'
277 {
278 is_first_iteration = false;
279 return false;
280 }
281 is_first_iteration = false;
282
283 (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(right))
284 || left == '\n'
285 })
286}
287
288/// Returns a position of the previous word boundary, where a word character is defined as either
289/// uppercase letter, lowercase letter, '_' character, language-specific word character (like '-' in CSS) or newline.
290pub fn previous_word_start_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
291 let raw_point = point.to_point(map);
292 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
293
294 find_preceding_boundary_display_point(map, point, FindRange::MultiLine, &mut |left, right| {
295 (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(right))
296 || left == '\n'
297 || right == '\n'
298 })
299}
300
301/// Text movements are too greedy, making deletions too greedy too.
302/// Makes deletions more ergonomic by potentially reducing the deletion range based on its text contents:
303/// * whitespace sequences with length >= 2 stop the deletion after removal (despite movement jumping over the word behind the whitespaces)
304/// * brackets stop the deletion after removal (despite movement currently not accounting for these and jumping over)
305pub fn adjust_greedy_deletion(
306 map: &DisplaySnapshot,
307 delete_from: DisplayPoint,
308 delete_until: DisplayPoint,
309 ignore_brackets: bool,
310) -> DisplayPoint {
311 if delete_from == delete_until {
312 return delete_until;
313 }
314 let is_backward = delete_from > delete_until;
315 let delete_range = if is_backward {
316 map.display_point_to_point(delete_until, Bias::Left)
317 .to_offset(map.buffer_snapshot())
318 ..map
319 .display_point_to_point(delete_from, Bias::Right)
320 .to_offset(map.buffer_snapshot())
321 } else {
322 map.display_point_to_point(delete_from, Bias::Left)
323 .to_offset(map.buffer_snapshot())
324 ..map
325 .display_point_to_point(delete_until, Bias::Right)
326 .to_offset(map.buffer_snapshot())
327 };
328
329 let trimmed_delete_range = if ignore_brackets {
330 delete_range
331 } else {
332 let brackets_in_delete_range = map
333 .buffer_snapshot()
334 .bracket_ranges(delete_range.clone())
335 .into_iter()
336 .flatten()
337 .flat_map(|(left_bracket, right_bracket)| {
338 [
339 left_bracket.start,
340 left_bracket.end,
341 right_bracket.start,
342 right_bracket.end,
343 ]
344 })
345 .filter(|&bracket| delete_range.start < bracket && bracket < delete_range.end);
346 let closest_bracket = if is_backward {
347 brackets_in_delete_range.max()
348 } else {
349 brackets_in_delete_range.min()
350 };
351
352 if is_backward {
353 closest_bracket.unwrap_or(delete_range.start)..delete_range.end
354 } else {
355 delete_range.start..closest_bracket.unwrap_or(delete_range.end)
356 }
357 };
358
359 let mut whitespace_sequences = Vec::new();
360 let mut current_offset = trimmed_delete_range.start;
361 let mut whitespace_sequence_length = MultiBufferOffset(0);
362 let mut whitespace_sequence_start = MultiBufferOffset(0);
363 for ch in map
364 .buffer_snapshot()
365 .text_for_range(trimmed_delete_range.clone())
366 .flat_map(str::chars)
367 {
368 if ch.is_whitespace() {
369 if whitespace_sequence_length == MultiBufferOffset(0) {
370 whitespace_sequence_start = current_offset;
371 }
372 whitespace_sequence_length += 1;
373 } else {
374 if whitespace_sequence_length >= MultiBufferOffset(2) {
375 whitespace_sequences.push((whitespace_sequence_start, current_offset));
376 }
377 whitespace_sequence_start = MultiBufferOffset(0);
378 whitespace_sequence_length = MultiBufferOffset(0);
379 }
380 current_offset += ch.len_utf8();
381 }
382 if whitespace_sequence_length >= MultiBufferOffset(2) {
383 whitespace_sequences.push((whitespace_sequence_start, current_offset));
384 }
385
386 let closest_whitespace_end = if is_backward {
387 whitespace_sequences.last().map(|&(start, _)| start)
388 } else {
389 whitespace_sequences.first().map(|&(_, end)| end)
390 };
391
392 closest_whitespace_end
393 .unwrap_or_else(|| {
394 if is_backward {
395 trimmed_delete_range.start
396 } else {
397 trimmed_delete_range.end
398 }
399 })
400 .to_display_point(map)
401}
402
403/// Returns a position of the previous subword boundary, where a subword is defined as a run of
404/// word characters of the same "subkind" - where subcharacter kinds are '_' character,
405/// lowerspace characters and uppercase characters.
406pub fn previous_subword_start(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
407 let raw_point = point.to_point(map);
408 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
409
410 find_preceding_boundary_display_point(map, point, FindRange::MultiLine, &mut |left, right| {
411 is_subword_start(left, right, &classifier) || left == '\n' || right == '\n'
412 })
413}
414
415/// Returns a position of the previous subword boundary, where a subword is defined as a run of
416/// word characters of the same "subkind" - where subcharacter kinds are '_' character,
417/// lowerspace characters and uppercase characters or newline.
418pub fn previous_subword_start_or_newline(
419 map: &DisplaySnapshot,
420 point: DisplayPoint,
421) -> DisplayPoint {
422 let raw_point = point.to_point(map);
423 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
424
425 find_preceding_boundary_display_point(map, point, FindRange::MultiLine, &mut |left, right| {
426 (is_subword_start(left, right, &classifier)) || left == '\n' || right == '\n'
427 })
428}
429
430pub fn is_subword_start(left: char, right: char, classifier: &CharClassifier) -> bool {
431 let is_word_start = classifier.kind(left) != classifier.kind(right) && !right.is_whitespace();
432 let is_subword_start = classifier.is_word('-') && left == '-' && right != '-'
433 || left == '_' && right != '_'
434 || left != '_' && right == '_'
435 || left.is_lowercase() && right.is_uppercase();
436 is_word_start || is_subword_start
437}
438
439/// Returns a position of the next word boundary, where a word character is defined as either
440/// uppercase letter, lowercase letter, '_' character or language-specific word character (like '-' in CSS).
441pub fn next_word_end(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
442 let raw_point = point.to_point(map);
443 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
444 let mut is_first_iteration = true;
445 find_boundary(map, point, FindRange::MultiLine, &mut |left, right| {
446 // Make alt-right skip punctuation to respect VSCode behaviour. For example: |.hello goes to .hello|
447 if is_first_iteration
448 && classifier.is_punctuation(left)
449 && !classifier.is_punctuation(right)
450 && right != '\n'
451 {
452 is_first_iteration = false;
453 return false;
454 }
455 is_first_iteration = false;
456
457 (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(left))
458 || right == '\n'
459 })
460}
461
462/// Returns a position of the next word boundary, where a word character is defined as either
463/// uppercase letter, lowercase letter, '_' character, language-specific word character (like '-' in CSS) or newline.
464pub fn next_word_end_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
465 let raw_point = point.to_point(map);
466 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
467
468 let mut on_starting_row = true;
469 find_boundary(map, point, FindRange::MultiLine, &mut |left, right| {
470 if left == '\n' {
471 on_starting_row = false;
472 }
473 (classifier.kind(left) != classifier.kind(right)
474 && ((on_starting_row && !left.is_whitespace())
475 || (!on_starting_row && !right.is_whitespace())))
476 || right == '\n'
477 })
478}
479
480/// Returns a position of the next subword boundary, where a subword is defined as a run of
481/// word characters of the same "subkind" - where subcharacter kinds are '_' character,
482/// lowerspace characters and uppercase characters.
483pub fn next_subword_end(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
484 let raw_point = point.to_point(map);
485 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
486
487 find_boundary(map, point, FindRange::MultiLine, &mut |left, right| {
488 is_subword_end(left, right, &classifier) || left == '\n' || right == '\n'
489 })
490}
491
492/// Returns a position of the next subword boundary, where a subword is defined as a run of
493/// word characters of the same "subkind" - where subcharacter kinds are '_' character,
494/// lowerspace characters and uppercase characters or newline.
495pub fn next_subword_end_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint {
496 let raw_point = point.to_point(map);
497 let classifier = map.buffer_snapshot().char_classifier_at(raw_point);
498
499 let mut on_starting_row = true;
500 find_boundary(map, point, FindRange::MultiLine, &mut |left, right| {
501 if left == '\n' {
502 on_starting_row = false;
503 }
504 ((classifier.kind(left) != classifier.kind(right)
505 || is_subword_boundary_end(left, right, &classifier))
506 && ((on_starting_row && !left.is_whitespace())
507 || (!on_starting_row && !right.is_whitespace())))
508 || right == '\n'
509 })
510}
511
512pub fn is_subword_end(left: char, right: char, classifier: &CharClassifier) -> bool {
513 let is_word_end =
514 (classifier.kind(left) != classifier.kind(right)) && !classifier.is_whitespace(left);
515 is_word_end || is_subword_boundary_end(left, right, classifier)
516}
517
518/// Returns true if the transition from `left` to `right` is a subword boundary,
519/// such as case changes, underscores, or dashes. Does not include word boundaries like whitespace.
520fn is_subword_boundary_end(left: char, right: char, classifier: &CharClassifier) -> bool {
521 classifier.is_word('-') && left != '-' && right == '-'
522 || left != '_' && right == '_'
523 || left == '_' && right != '_'
524 || left.is_lowercase() && right.is_uppercase()
525}
526
527/// Returns a position of the start of the current paragraph, where a paragraph
528/// is defined as a run of non-blank lines.
529pub fn start_of_paragraph(
530 map: &DisplaySnapshot,
531 display_point: DisplayPoint,
532 mut count: usize,
533) -> DisplayPoint {
534 let point = display_point.to_point(map);
535 if point.row == 0 {
536 return DisplayPoint::zero();
537 }
538
539 let mut found_non_blank_line = false;
540 for row in (0..point.row + 1).rev() {
541 let blank = map.buffer_snapshot().is_line_blank(MultiBufferRow(row));
542 if found_non_blank_line && blank {
543 if count <= 1 {
544 return Point::new(row, 0).to_display_point(map);
545 }
546 count -= 1;
547 found_non_blank_line = false;
548 }
549
550 found_non_blank_line |= !blank;
551 }
552
553 DisplayPoint::zero()
554}
555
556/// Returns a position of the end of the current paragraph, where a paragraph
557/// is defined as a run of non-blank lines.
558pub fn end_of_paragraph(
559 map: &DisplaySnapshot,
560 display_point: DisplayPoint,
561 mut count: usize,
562) -> DisplayPoint {
563 let point = display_point.to_point(map);
564 if point.row == map.buffer_snapshot().max_row().0 {
565 return map.max_point();
566 }
567
568 let mut found_non_blank_line = false;
569 for row in point.row..=map.buffer_snapshot().max_row().0 {
570 let blank = map.buffer_snapshot().is_line_blank(MultiBufferRow(row));
571 if found_non_blank_line && blank {
572 if count <= 1 {
573 return Point::new(row, 0).to_display_point(map);
574 }
575 count -= 1;
576 found_non_blank_line = false;
577 }
578
579 found_non_blank_line |= !blank;
580 }
581
582 map.max_point()
583}
584
585pub fn start_of_excerpt(
586 map: &DisplaySnapshot,
587 display_point: DisplayPoint,
588 direction: Direction,
589) -> DisplayPoint {
590 let point = map.display_point_to_point(display_point, Bias::Left);
591 let Some((_, excerpt_range)) = map.buffer_snapshot().excerpt_containing(point..point) else {
592 return display_point;
593 };
594 match direction {
595 Direction::Prev => {
596 let Some(start_anchor) = map.anchor_in_excerpt(excerpt_range.context.start) else {
597 return display_point;
598 };
599 let mut start = start_anchor.to_display_point(map);
600 if start >= display_point && start.row() > DisplayRow(0) {
601 let Some(excerpt) = map.buffer_snapshot().excerpt_before(start_anchor) else {
602 return display_point;
603 };
604 if let Some(start_anchor) = map.anchor_in_excerpt(excerpt.context.start) {
605 start = start_anchor.to_display_point(map);
606 }
607 }
608 start
609 }
610 Direction::Next => {
611 let Some(end_anchor) = map.anchor_in_excerpt(excerpt_range.context.end) else {
612 return display_point;
613 };
614 let mut end = end_anchor.to_display_point(map);
615 *end.row_mut() += 1;
616 map.clip_point(end, Bias::Right)
617 }
618 }
619}
620
621pub fn end_of_excerpt(
622 map: &DisplaySnapshot,
623 display_point: DisplayPoint,
624 direction: Direction,
625) -> DisplayPoint {
626 let point = map.display_point_to_point(display_point, Bias::Left);
627 let Some((_, excerpt_range)) = map.buffer_snapshot().excerpt_containing(point..point) else {
628 return display_point;
629 };
630 match direction {
631 Direction::Prev => {
632 let Some(start_anchor) = map.anchor_in_excerpt(excerpt_range.context.start) else {
633 return display_point;
634 };
635 let mut start = start_anchor.to_display_point(map);
636 if start.row() > DisplayRow(0) {
637 *start.row_mut() -= 1;
638 }
639 start = map.clip_point(start, Bias::Left);
640 *start.column_mut() = 0;
641 start
642 }
643 Direction::Next => {
644 let Some(end_anchor) = map.anchor_in_excerpt(excerpt_range.context.end) else {
645 return display_point;
646 };
647 let mut end = end_anchor.to_display_point(map);
648 *end.column_mut() = 0;
649 if end <= display_point {
650 *end.row_mut() += 1;
651 let point_end = map.display_point_to_point(end, Bias::Right);
652 let Some((_, excerpt_range)) = map
653 .buffer_snapshot()
654 .excerpt_containing(point_end..point_end)
655 else {
656 return display_point;
657 };
658 if let Some(end_anchor) = map.anchor_in_excerpt(excerpt_range.context.end) {
659 end = end_anchor.to_display_point(map);
660 }
661 *end.column_mut() = 0;
662 }
663 end
664 }
665 }
666}
667
668/// Scans for a boundary preceding the given start point `from` until a boundary is found,
669/// indicated by the given predicate returning true.
670/// The predicate is called with the character to the left and right of the candidate boundary location.
671/// If FindRange::SingleLine is specified and no boundary is found before the start of the current line, the start of the current line will be returned.
672pub fn find_preceding_boundary_point(
673 buffer_snapshot: &MultiBufferSnapshot,
674 from: Point,
675 find_range: FindRange,
676 is_boundary: &mut dyn FnMut(char, char) -> bool,
677) -> Point {
678 let mut prev_ch = None;
679 let mut offset = from.to_offset(buffer_snapshot);
680
681 for ch in buffer_snapshot.reversed_chars_at(offset) {
682 if find_range == FindRange::SingleLine && ch == '\n' {
683 break;
684 }
685 if let Some(prev_ch) = prev_ch
686 && is_boundary(ch, prev_ch)
687 {
688 break;
689 }
690
691 offset -= ch.len_utf8();
692 prev_ch = Some(ch);
693 }
694
695 offset.to_point(buffer_snapshot)
696}
697
698/// Scans for a boundary preceding the given start point `from` until a boundary is found,
699/// indicated by the given predicate returning true.
700/// The predicate is called with the character to the left and right of the candidate boundary location.
701/// If FindRange::SingleLine is specified and no boundary is found before the start of the current line, the start of the current line will be returned.
702pub fn find_preceding_boundary_display_point(
703 map: &DisplaySnapshot,
704 from: DisplayPoint,
705 find_range: FindRange,
706 is_boundary: &mut dyn FnMut(char, char) -> bool,
707) -> DisplayPoint {
708 let result = find_preceding_boundary_point(
709 map.buffer_snapshot(),
710 from.to_point(map),
711 find_range,
712 is_boundary,
713 );
714 map.clip_point(result.to_display_point(map), Bias::Left)
715}
716
717/// Scans for a boundary following the given start point until a boundary is found, indicated by the
718/// given predicate returning true. The predicate is called with the character to the left and right
719/// of the candidate boundary location, and will be called with `\n` characters indicating the start
720/// or end of a line. The function supports optionally returning the point just before the boundary
721/// is found via return_point_before_boundary.
722pub fn find_boundary_point(
723 map: &DisplaySnapshot,
724 from: DisplayPoint,
725 find_range: FindRange,
726 is_boundary: &mut dyn FnMut(char, char) -> bool,
727 return_point_before_boundary: bool,
728) -> DisplayPoint {
729 let mut offset = from.to_offset(map, Bias::Right);
730 let mut prev_offset = offset;
731 let mut prev_ch = None;
732
733 for ch in map.buffer_snapshot().chars_at(offset) {
734 if find_range == FindRange::SingleLine && ch == '\n' {
735 break;
736 }
737 if let Some(prev_ch) = prev_ch
738 && is_boundary(prev_ch, ch)
739 {
740 if return_point_before_boundary {
741 return map.clip_point(prev_offset.to_display_point(map), Bias::Right);
742 } else {
743 break;
744 }
745 }
746 prev_offset = offset;
747 offset += ch.len_utf8();
748 prev_ch = Some(ch);
749 }
750 map.clip_point(offset.to_display_point(map), Bias::Right)
751}
752
753pub fn find_preceding_boundary_trail(
754 map: &DisplaySnapshot,
755 head: DisplayPoint,
756 is_boundary: &mut dyn FnMut(char, char) -> bool,
757) -> (Option<DisplayPoint>, DisplayPoint) {
758 let mut offset = head.to_offset(map, Bias::Left);
759 let mut trail_offset = None;
760
761 let mut prev_ch = map.buffer_snapshot().chars_at(offset).next();
762 let mut forward = map.buffer_snapshot().reversed_chars_at(offset).peekable();
763
764 // Skip newlines
765 while let Some(&ch) = forward.peek() {
766 if ch == '\n' {
767 prev_ch = forward.next();
768 offset -= ch.len_utf8();
769 trail_offset = Some(offset);
770 } else {
771 break;
772 }
773 }
774
775 // Find the boundary
776 let start_offset = offset;
777 for ch in forward {
778 if let Some(prev_ch) = prev_ch
779 && is_boundary(prev_ch, ch)
780 {
781 if start_offset == offset {
782 trail_offset = Some(offset);
783 } else {
784 break;
785 }
786 }
787 offset -= ch.len_utf8();
788 prev_ch = Some(ch);
789 }
790
791 let trail = trail_offset
792 .map(|trail_offset| map.clip_point(trail_offset.to_display_point(map), Bias::Left));
793
794 (
795 trail,
796 map.clip_point(offset.to_display_point(map), Bias::Left),
797 )
798}
799
800/// Finds the location of a boundary
801pub fn find_boundary_trail(
802 map: &DisplaySnapshot,
803 head: DisplayPoint,
804 is_boundary: &mut dyn FnMut(char, char) -> bool,
805) -> (Option<DisplayPoint>, DisplayPoint) {
806 let mut offset = head.to_offset(map, Bias::Right);
807 let mut trail_offset = None;
808
809 let mut prev_ch = map.buffer_snapshot().reversed_chars_at(offset).next();
810 let mut forward = map.buffer_snapshot().chars_at(offset).peekable();
811
812 // Skip newlines
813 while let Some(&ch) = forward.peek() {
814 if ch == '\n' {
815 prev_ch = forward.next();
816 offset += ch.len_utf8();
817 trail_offset = Some(offset);
818 } else {
819 break;
820 }
821 }
822
823 // Find the boundary
824 let start_offset = offset;
825 for ch in forward {
826 if let Some(prev_ch) = prev_ch
827 && is_boundary(prev_ch, ch)
828 {
829 if start_offset == offset {
830 trail_offset = Some(offset);
831 } else {
832 break;
833 }
834 }
835 offset += ch.len_utf8();
836 prev_ch = Some(ch);
837 }
838
839 let trail = trail_offset
840 .map(|trail_offset| map.clip_point(trail_offset.to_display_point(map), Bias::Right));
841
842 (
843 trail,
844 map.clip_point(offset.to_display_point(map), Bias::Right),
845 )
846}
847
848pub fn find_boundary(
849 map: &DisplaySnapshot,
850 from: DisplayPoint,
851 find_range: FindRange,
852 is_boundary: &mut dyn FnMut(char, char) -> bool,
853) -> DisplayPoint {
854 find_boundary_point(map, from, find_range, is_boundary, false)
855}
856
857pub fn find_boundary_exclusive(
858 map: &DisplaySnapshot,
859 from: DisplayPoint,
860 find_range: FindRange,
861 is_boundary: &mut dyn FnMut(char, char) -> bool,
862) -> DisplayPoint {
863 find_boundary_point(map, from, find_range, is_boundary, true)
864}
865
866/// Returns an iterator over the characters following a given offset in the [`DisplaySnapshot`].
867/// The returned value also contains a range of the start/end of a returned character in
868/// the [`DisplaySnapshot`]. The offsets are relative to the start of a buffer.
869pub fn chars_after(
870 map: &DisplaySnapshot,
871 mut offset: MultiBufferOffset,
872) -> impl Iterator<Item = (char, Range<MultiBufferOffset>)> + '_ {
873 map.buffer_snapshot().chars_at(offset).map(move |ch| {
874 let before = offset;
875 offset += ch.len_utf8();
876 (ch, before..offset)
877 })
878}
879
880/// Returns a reverse iterator over the characters following a given offset in the [`DisplaySnapshot`].
881/// The returned value also contains a range of the start/end of a returned character in
882/// the [`DisplaySnapshot`]. The offsets are relative to the start of a buffer.
883pub fn chars_before(
884 map: &DisplaySnapshot,
885 mut offset: MultiBufferOffset,
886) -> impl Iterator<Item = (char, Range<MultiBufferOffset>)> + '_ {
887 map.buffer_snapshot()
888 .reversed_chars_at(offset)
889 .map(move |ch| {
890 let after = offset;
891 offset -= ch.len_utf8();
892 (ch, offset..after)
893 })
894}
895
896/// Returns a list of lines (represented as a [`DisplayPoint`] range) contained
897/// within a passed range.
898///
899/// The line ranges are **always* going to be in bounds of a requested range, which means that
900/// the first and the last lines might not necessarily represent the
901/// full range of a logical line (as their `.start`/`.end` values are clipped to those of a passed in range).
902pub fn split_display_range_by_lines(
903 map: &DisplaySnapshot,
904 range: Range<DisplayPoint>,
905) -> Vec<Range<DisplayPoint>> {
906 let mut result = Vec::new();
907
908 let mut start = range.start;
909 // Loop over all the covered rows until the one containing the range end
910 for row in range.start.row().0..range.end.row().0 {
911 let row_end_column = map.line_len(DisplayRow(row));
912 let end = map.clip_point(
913 DisplayPoint::new(DisplayRow(row), row_end_column),
914 Bias::Left,
915 );
916 if start != end {
917 result.push(start..end);
918 }
919 start = map.clip_point(DisplayPoint::new(DisplayRow(row + 1), 0), Bias::Left);
920 }
921
922 // Add the final range from the start of the last end to the original range end.
923 result.push(start..range.end);
924
925 result
926}
927
928#[cfg(test)]
929mod tests {
930 use super::*;
931 use crate::{
932 Buffer, DisplayMap, DisplayRow, FoldPlaceholder, MultiBuffer,
933 inlays::Inlay,
934 test::{editor_test_context::EditorTestContext, marked_display_snapshot},
935 };
936 use gpui::{AppContext as _, font, px};
937 use language::Capability;
938 use multi_buffer::PathKey;
939 use project::project_settings::DiagnosticSeverity;
940 use settings::SettingsStore;
941 use util::post_inc;
942
943 #[gpui::test]
944 fn test_previous_word_start(cx: &mut gpui::App) {
945 init_test(cx);
946
947 fn assert(marked_text: &str, cx: &mut gpui::App) {
948 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
949 let actual = previous_word_start(&snapshot, display_points[1]);
950 let expected = display_points[0];
951 if actual != expected {
952 eprintln!(
953 "previous_word_start mismatch for '{}': actual={:?}, expected={:?}",
954 marked_text, actual, expected
955 );
956 }
957 assert_eq!(actual, expected);
958 }
959
960 assert("\nˇ ˇlorem", cx);
961 assert("ˇ\nˇ lorem", cx);
962 assert(" ˇloremˇ", cx);
963 assert("ˇ ˇlorem", cx);
964 assert(" ˇlorˇem", cx);
965 assert("\nlorem\nˇ ˇipsum", cx);
966 assert("\n\nˇ\nˇ", cx);
967 assert(" ˇlorem ˇipsum", cx);
968 assert("ˇlorem-ˇipsum", cx);
969 assert("loremˇ-#$@ˇipsum", cx);
970 assert("ˇlorem_ˇipsum", cx);
971 assert(" ˇdefγˇ", cx);
972 assert(" ˇbcΔˇ", cx);
973 // Test punctuation skipping behavior
974 assert("ˇhello.ˇ", cx);
975 assert("helloˇ...ˇ", cx);
976 assert("helloˇ.---..ˇtest", cx);
977 assert("test ˇ.--ˇtest", cx);
978 assert("oneˇ,;:!?ˇtwo", cx);
979 }
980
981 #[gpui::test]
982 fn test_previous_subword_start(cx: &mut gpui::App) {
983 init_test(cx);
984
985 fn assert(marked_text: &str, cx: &mut gpui::App) {
986 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
987 assert_eq!(
988 previous_subword_start(&snapshot, display_points[1]),
989 display_points[0]
990 );
991 }
992
993 // Subword boundaries are respected
994 assert("loremˇ_ˇipsum", cx);
995 assert("lorem_ˇipsumˇ", cx);
996 assert("ˇloremˇ_ipsum", cx);
997 assert("lorem_ˇipsumˇ_dolor", cx);
998 assert("loremˇIpˇsum", cx);
999 assert("loremˇIpsumˇ", cx);
1000
1001 // Word boundaries are still respected
1002 assert("\nˇ ˇlorem", cx);
1003 assert(" ˇloremˇ", cx);
1004 assert(" ˇlorˇem", cx);
1005 assert("\nlorem\nˇ ˇipsum", cx);
1006 assert("\n\nˇ\nˇ", cx);
1007 assert(" ˇlorem ˇipsum", cx);
1008 assert("loremˇ-ˇipsum", cx);
1009 assert("loremˇ-#$@ˇipsum", cx);
1010 assert(" ˇdefγˇ", cx);
1011 assert(" bcˇΔˇ", cx);
1012 assert(" ˇbcδˇ", cx);
1013 assert(" abˇ——ˇcd", cx);
1014 }
1015
1016 #[gpui::test]
1017 fn test_find_preceding_boundary(cx: &mut gpui::App) {
1018 init_test(cx);
1019
1020 fn assert(
1021 marked_text: &str,
1022 cx: &mut gpui::App,
1023 is_boundary: &mut dyn FnMut(char, char) -> bool,
1024 ) {
1025 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1026 assert_eq!(
1027 find_preceding_boundary_display_point(
1028 &snapshot,
1029 display_points[1],
1030 FindRange::MultiLine,
1031 is_boundary
1032 ),
1033 display_points[0]
1034 );
1035 }
1036
1037 assert("abcˇdef\ngh\nijˇk", cx, &mut |left, right| {
1038 left == 'c' && right == 'd'
1039 });
1040 assert("abcdef\nˇgh\nijˇk", cx, &mut |left, right| {
1041 left == '\n' && right == 'g'
1042 });
1043 let mut line_count = 0;
1044 assert("abcdef\nˇgh\nijˇk", cx, &mut |left, _| {
1045 if left == '\n' {
1046 line_count += 1;
1047 line_count == 2
1048 } else {
1049 false
1050 }
1051 });
1052 }
1053
1054 #[gpui::test]
1055 fn test_find_preceding_boundary_with_inlays(cx: &mut gpui::App) {
1056 init_test(cx);
1057
1058 let input_text = "abcdefghijklmnopqrstuvwxys";
1059 let font = font("Helvetica");
1060 let font_size = px(14.0);
1061 let buffer = MultiBuffer::build_simple(input_text, cx);
1062 let buffer_snapshot = buffer.read(cx).snapshot(cx);
1063
1064 let display_map = cx.new(|cx| {
1065 DisplayMap::new(
1066 buffer,
1067 font,
1068 font_size,
1069 None,
1070 1,
1071 1,
1072 FoldPlaceholder::test(),
1073 DiagnosticSeverity::Warning,
1074 cx,
1075 )
1076 });
1077
1078 // add all kinds of inlays between two word boundaries: we should be able to cross them all, when looking for another boundary
1079 let mut id = 0;
1080 let inlays = (0..buffer_snapshot.len().0)
1081 .flat_map(|offset| {
1082 let offset = MultiBufferOffset(offset);
1083 [
1084 Inlay::edit_prediction(
1085 post_inc(&mut id),
1086 buffer_snapshot.anchor_before(offset),
1087 "test",
1088 ),
1089 Inlay::edit_prediction(
1090 post_inc(&mut id),
1091 buffer_snapshot.anchor_after(offset),
1092 "test",
1093 ),
1094 Inlay::mock_hint(
1095 post_inc(&mut id),
1096 buffer_snapshot.anchor_before(offset),
1097 "test",
1098 ),
1099 Inlay::mock_hint(
1100 post_inc(&mut id),
1101 buffer_snapshot.anchor_after(offset),
1102 "test",
1103 ),
1104 ]
1105 })
1106 .collect();
1107 let snapshot = display_map.update(cx, |map, cx| {
1108 map.splice_inlays(&[], inlays, cx);
1109 map.snapshot(cx)
1110 });
1111
1112 assert_eq!(
1113 find_preceding_boundary_display_point(
1114 &snapshot,
1115 buffer_snapshot.len().to_display_point(&snapshot),
1116 FindRange::MultiLine,
1117 &mut |left, _| left == 'e',
1118 ),
1119 snapshot
1120 .buffer_snapshot()
1121 .offset_to_point(MultiBufferOffset(5))
1122 .to_display_point(&snapshot),
1123 "Should not stop at inlays when looking for boundaries"
1124 );
1125 }
1126
1127 #[gpui::test]
1128 fn test_next_word_end(cx: &mut gpui::App) {
1129 init_test(cx);
1130
1131 fn assert(marked_text: &str, cx: &mut gpui::App) {
1132 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1133 let actual = next_word_end(&snapshot, display_points[0]);
1134 let expected = display_points[1];
1135 if actual != expected {
1136 eprintln!(
1137 "next_word_end mismatch for '{}': actual={:?}, expected={:?}",
1138 marked_text, actual, expected
1139 );
1140 }
1141 assert_eq!(actual, expected);
1142 }
1143
1144 assert("\nˇ loremˇ", cx);
1145 assert(" ˇloremˇ", cx);
1146 assert(" lorˇemˇ", cx);
1147 assert(" loremˇ ˇ\nipsum\n", cx);
1148 assert("\nˇ\nˇ\n\n", cx);
1149 assert("loremˇ ipsumˇ ", cx);
1150 assert("loremˇ-ipsumˇ", cx);
1151 assert("loremˇ#$@-ˇipsum", cx);
1152 assert("loremˇ_ipsumˇ", cx);
1153 assert(" ˇbcΔˇ", cx);
1154 assert(" abˇ——ˇcd", cx);
1155 // Test punctuation skipping behavior
1156 assert("ˇ.helloˇ", cx);
1157 assert("display_pointsˇ[0ˇ]", cx);
1158 assert("ˇ...ˇhello", cx);
1159 assert("helloˇ.---..ˇtest", cx);
1160 assert("testˇ.--ˇ test", cx);
1161 assert("oneˇ,;:!?ˇtwo", cx);
1162 }
1163
1164 #[gpui::test]
1165 fn test_next_subword_end(cx: &mut gpui::App) {
1166 init_test(cx);
1167
1168 fn assert(marked_text: &str, cx: &mut gpui::App) {
1169 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1170 assert_eq!(
1171 next_subword_end(&snapshot, display_points[0]),
1172 display_points[1]
1173 );
1174 }
1175
1176 // Subword boundaries are respected
1177 assert("loremˇ_ˇipsum", cx);
1178 assert("ˇloremˇ_ipsum", cx);
1179 assert("loremˇ_ˇipsum", cx);
1180 assert("lorem_ˇipsumˇ_dolor", cx);
1181 assert("loˇremˇIpsum", cx);
1182 assert("loremˇIpsumˇDolor", cx);
1183
1184 // Word boundaries are still respected
1185 assert("\nˇ loremˇ", cx);
1186 assert(" ˇloremˇ", cx);
1187 assert(" lorˇemˇ", cx);
1188 assert(" loremˇ ˇ\nipsum\n", cx);
1189 assert("\nˇ\nˇ\n\n", cx);
1190 assert("loremˇ ipsumˇ ", cx);
1191 assert("loremˇ-ˇipsum", cx);
1192 assert("loremˇ#$@-ˇipsum", cx);
1193 assert("loremˇ_ˇipsum", cx);
1194 assert(" ˇbcˇΔ", cx);
1195 assert(" abˇ——ˇcd", cx);
1196 }
1197
1198 #[gpui::test]
1199 fn test_find_boundary(cx: &mut gpui::App) {
1200 init_test(cx);
1201
1202 fn assert(
1203 marked_text: &str,
1204 cx: &mut gpui::App,
1205 is_boundary: &mut dyn FnMut(char, char) -> bool,
1206 ) {
1207 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1208 assert_eq!(
1209 find_boundary(
1210 &snapshot,
1211 display_points[0],
1212 FindRange::MultiLine,
1213 is_boundary,
1214 ),
1215 display_points[1]
1216 );
1217 }
1218
1219 assert("abcˇdef\ngh\nijˇk", cx, &mut |left, right| {
1220 left == 'j' && right == 'k'
1221 });
1222 assert("abˇcdef\ngh\nˇijk", cx, &mut |left, right| {
1223 left == '\n' && right == 'i'
1224 });
1225 let mut line_count = 0;
1226 assert("abcˇdef\ngh\nˇijk", cx, &mut |left, _| {
1227 if left == '\n' {
1228 line_count += 1;
1229 line_count == 2
1230 } else {
1231 false
1232 }
1233 });
1234 }
1235
1236 #[gpui::test]
1237 async fn test_move_up_and_down_with_excerpts(cx: &mut gpui::TestAppContext) {
1238 cx.update(|cx| {
1239 init_test(cx);
1240 });
1241
1242 let mut cx = EditorTestContext::new(cx).await;
1243 let editor = cx.editor.clone();
1244 let window = cx.window;
1245 _ = cx.update_window(window, |_, window, cx| {
1246 let text_layout_details =
1247 editor.update(cx, |editor, cx| editor.text_layout_details(window, cx));
1248
1249 let font = font("Helvetica");
1250
1251 let buffer = cx.new(|cx| Buffer::local("abc\ndefg\na\na\na\nhijkl\nmn", cx));
1252 let multibuffer = cx.new(|cx| {
1253 let mut multibuffer = MultiBuffer::new(Capability::ReadWrite);
1254 multibuffer.set_excerpts_for_path(
1255 PathKey::sorted(0),
1256 buffer.clone(),
1257 [
1258 Point::new(0, 0)..Point::new(1, 4),
1259 Point::new(5, 0)..Point::new(6, 2),
1260 ],
1261 0,
1262 cx,
1263 );
1264 multibuffer
1265 });
1266 let display_map = cx.new(|cx| {
1267 DisplayMap::new(
1268 multibuffer,
1269 font,
1270 px(14.0),
1271 None,
1272 0,
1273 1,
1274 FoldPlaceholder::test(),
1275 DiagnosticSeverity::Warning,
1276 cx,
1277 )
1278 });
1279 let snapshot = display_map.update(cx, |map, cx| map.snapshot(cx));
1280
1281 assert_eq!(snapshot.text(), "abc\ndefg\n\nhijkl\nmn");
1282
1283 let col_2_x = snapshot
1284 .x_for_display_point(DisplayPoint::new(DisplayRow(0), 2), &text_layout_details);
1285
1286 // Can't move up into the first excerpt's header
1287 assert_eq!(
1288 up(
1289 &snapshot,
1290 DisplayPoint::new(DisplayRow(0), 2),
1291 SelectionGoal::HorizontalPosition(f64::from(col_2_x)),
1292 false,
1293 &text_layout_details
1294 ),
1295 (
1296 DisplayPoint::new(DisplayRow(0), 0),
1297 SelectionGoal::HorizontalPosition(f64::from(col_2_x)),
1298 ),
1299 );
1300 assert_eq!(
1301 up(
1302 &snapshot,
1303 DisplayPoint::new(DisplayRow(0), 0),
1304 SelectionGoal::None,
1305 false,
1306 &text_layout_details
1307 ),
1308 (
1309 DisplayPoint::new(DisplayRow(0), 0),
1310 SelectionGoal::HorizontalPosition(0.0),
1311 ),
1312 );
1313
1314 let col_4_x = snapshot
1315 .x_for_display_point(DisplayPoint::new(DisplayRow(1), 4), &text_layout_details);
1316
1317 // Move up and down within first excerpt
1318 assert_eq!(
1319 up(
1320 &snapshot,
1321 DisplayPoint::new(DisplayRow(1), 4),
1322 SelectionGoal::HorizontalPosition(col_4_x.into()),
1323 false,
1324 &text_layout_details
1325 ),
1326 (
1327 DisplayPoint::new(DisplayRow(0), 3),
1328 SelectionGoal::HorizontalPosition(col_4_x.into())
1329 ),
1330 );
1331 assert_eq!(
1332 down(
1333 &snapshot,
1334 DisplayPoint::new(DisplayRow(0), 3),
1335 SelectionGoal::HorizontalPosition(col_4_x.into()),
1336 false,
1337 &text_layout_details
1338 ),
1339 (
1340 DisplayPoint::new(DisplayRow(1), 4),
1341 SelectionGoal::HorizontalPosition(col_4_x.into())
1342 ),
1343 );
1344
1345 let col_5_x = snapshot
1346 .x_for_display_point(DisplayPoint::new(DisplayRow(3), 5), &text_layout_details);
1347
1348 // Move up and down across second excerpt's header
1349 assert_eq!(
1350 up(
1351 &snapshot,
1352 DisplayPoint::new(DisplayRow(3), 5),
1353 SelectionGoal::HorizontalPosition(col_5_x.into()),
1354 false,
1355 &text_layout_details
1356 ),
1357 (
1358 DisplayPoint::new(DisplayRow(1), 4),
1359 SelectionGoal::HorizontalPosition(col_5_x.into())
1360 ),
1361 );
1362 assert_eq!(
1363 down(
1364 &snapshot,
1365 DisplayPoint::new(DisplayRow(1), 4),
1366 SelectionGoal::HorizontalPosition(col_5_x.into()),
1367 false,
1368 &text_layout_details
1369 ),
1370 (
1371 DisplayPoint::new(DisplayRow(3), 5),
1372 SelectionGoal::HorizontalPosition(col_5_x.into())
1373 ),
1374 );
1375
1376 let max_point_x = snapshot
1377 .x_for_display_point(DisplayPoint::new(DisplayRow(4), 2), &text_layout_details);
1378
1379 // Can't move down off the end, and attempting to do so leaves the selection goal unchanged
1380 assert_eq!(
1381 down(
1382 &snapshot,
1383 DisplayPoint::new(DisplayRow(4), 0),
1384 SelectionGoal::HorizontalPosition(0.0),
1385 false,
1386 &text_layout_details
1387 ),
1388 (
1389 DisplayPoint::new(DisplayRow(4), 2),
1390 SelectionGoal::HorizontalPosition(0.0)
1391 ),
1392 );
1393 assert_eq!(
1394 down(
1395 &snapshot,
1396 DisplayPoint::new(DisplayRow(4), 2),
1397 SelectionGoal::HorizontalPosition(max_point_x.into()),
1398 false,
1399 &text_layout_details
1400 ),
1401 (
1402 DisplayPoint::new(DisplayRow(4), 2),
1403 SelectionGoal::HorizontalPosition(max_point_x.into())
1404 ),
1405 );
1406 });
1407 }
1408
1409 fn init_test(cx: &mut gpui::App) {
1410 let settings_store = SettingsStore::test(cx);
1411 cx.set_global(settings_store);
1412 theme_settings::init(theme::LoadThemes::JustBase, cx);
1413 crate::init(cx);
1414 }
1415}