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) = map.buffer_snapshot().excerpt_containing(point..point) else {
592 return display_point;
593 };
594 match direction {
595 Direction::Prev => {
596 let mut start = excerpt.start_anchor().to_display_point(map);
597 if start >= display_point && start.row() > DisplayRow(0) {
598 let Some(excerpt) = map.buffer_snapshot().excerpt_before(excerpt.id()) else {
599 return display_point;
600 };
601 start = excerpt.start_anchor().to_display_point(map);
602 }
603 start
604 }
605 Direction::Next => {
606 let mut end = excerpt.end_anchor().to_display_point(map);
607 *end.row_mut() += 1;
608 map.clip_point(end, Bias::Right)
609 }
610 }
611}
612
613pub fn end_of_excerpt(
614 map: &DisplaySnapshot,
615 display_point: DisplayPoint,
616 direction: Direction,
617) -> DisplayPoint {
618 let point = map.display_point_to_point(display_point, Bias::Left);
619 let Some(excerpt) = map.buffer_snapshot().excerpt_containing(point..point) else {
620 return display_point;
621 };
622 match direction {
623 Direction::Prev => {
624 let mut start = excerpt.start_anchor().to_display_point(map);
625 if start.row() > DisplayRow(0) {
626 *start.row_mut() -= 1;
627 }
628 start = map.clip_point(start, Bias::Left);
629 *start.column_mut() = 0;
630 start
631 }
632 Direction::Next => {
633 let mut end = excerpt.end_anchor().to_display_point(map);
634 *end.column_mut() = 0;
635 if end <= display_point {
636 *end.row_mut() += 1;
637 let point_end = map.display_point_to_point(end, Bias::Right);
638 let Some(excerpt) = map
639 .buffer_snapshot()
640 .excerpt_containing(point_end..point_end)
641 else {
642 return display_point;
643 };
644 end = excerpt.end_anchor().to_display_point(map);
645 *end.column_mut() = 0;
646 }
647 end
648 }
649 }
650}
651
652/// Scans for a boundary preceding the given start point `from` until a boundary is found,
653/// indicated by the given predicate returning true.
654/// The predicate is called with the character to the left and right of the candidate boundary location.
655/// 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.
656pub fn find_preceding_boundary_point(
657 buffer_snapshot: &MultiBufferSnapshot,
658 from: Point,
659 find_range: FindRange,
660 is_boundary: &mut dyn FnMut(char, char) -> bool,
661) -> Point {
662 let mut prev_ch = None;
663 let mut offset = from.to_offset(buffer_snapshot);
664
665 for ch in buffer_snapshot.reversed_chars_at(offset) {
666 if find_range == FindRange::SingleLine && ch == '\n' {
667 break;
668 }
669 if let Some(prev_ch) = prev_ch
670 && is_boundary(ch, prev_ch)
671 {
672 break;
673 }
674
675 offset -= ch.len_utf8();
676 prev_ch = Some(ch);
677 }
678
679 offset.to_point(buffer_snapshot)
680}
681
682/// Scans for a boundary preceding the given start point `from` until a boundary is found,
683/// indicated by the given predicate returning true.
684/// The predicate is called with the character to the left and right of the candidate boundary location.
685/// 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.
686pub fn find_preceding_boundary_display_point(
687 map: &DisplaySnapshot,
688 from: DisplayPoint,
689 find_range: FindRange,
690 is_boundary: &mut dyn FnMut(char, char) -> bool,
691) -> DisplayPoint {
692 let result = find_preceding_boundary_point(
693 map.buffer_snapshot(),
694 from.to_point(map),
695 find_range,
696 is_boundary,
697 );
698 map.clip_point(result.to_display_point(map), Bias::Left)
699}
700
701/// Scans for a boundary following the given start point until a boundary is found, indicated by the
702/// given predicate returning true. The predicate is called with the character to the left and right
703/// of the candidate boundary location, and will be called with `\n` characters indicating the start
704/// or end of a line. The function supports optionally returning the point just before the boundary
705/// is found via return_point_before_boundary.
706pub fn find_boundary_point(
707 map: &DisplaySnapshot,
708 from: DisplayPoint,
709 find_range: FindRange,
710 is_boundary: &mut dyn FnMut(char, char) -> bool,
711 return_point_before_boundary: bool,
712) -> DisplayPoint {
713 let mut offset = from.to_offset(map, Bias::Right);
714 let mut prev_offset = offset;
715 let mut prev_ch = None;
716
717 for ch in map.buffer_snapshot().chars_at(offset) {
718 if find_range == FindRange::SingleLine && ch == '\n' {
719 break;
720 }
721 if let Some(prev_ch) = prev_ch
722 && is_boundary(prev_ch, ch)
723 {
724 if return_point_before_boundary {
725 return map.clip_point(prev_offset.to_display_point(map), Bias::Right);
726 } else {
727 break;
728 }
729 }
730 prev_offset = offset;
731 offset += ch.len_utf8();
732 prev_ch = Some(ch);
733 }
734 map.clip_point(offset.to_display_point(map), Bias::Right)
735}
736
737pub fn find_preceding_boundary_trail(
738 map: &DisplaySnapshot,
739 head: DisplayPoint,
740 is_boundary: &mut dyn FnMut(char, char) -> bool,
741) -> (Option<DisplayPoint>, DisplayPoint) {
742 let mut offset = head.to_offset(map, Bias::Left);
743 let mut trail_offset = None;
744
745 let mut prev_ch = map.buffer_snapshot().chars_at(offset).next();
746 let mut forward = map.buffer_snapshot().reversed_chars_at(offset).peekable();
747
748 // Skip newlines
749 while let Some(&ch) = forward.peek() {
750 if ch == '\n' {
751 prev_ch = forward.next();
752 offset -= ch.len_utf8();
753 trail_offset = Some(offset);
754 } else {
755 break;
756 }
757 }
758
759 // Find the boundary
760 let start_offset = offset;
761 for ch in forward {
762 if let Some(prev_ch) = prev_ch
763 && is_boundary(prev_ch, ch)
764 {
765 if start_offset == offset {
766 trail_offset = Some(offset);
767 } else {
768 break;
769 }
770 }
771 offset -= ch.len_utf8();
772 prev_ch = Some(ch);
773 }
774
775 let trail = trail_offset
776 .map(|trail_offset| map.clip_point(trail_offset.to_display_point(map), Bias::Left));
777
778 (
779 trail,
780 map.clip_point(offset.to_display_point(map), Bias::Left),
781 )
782}
783
784/// Finds the location of a boundary
785pub fn find_boundary_trail(
786 map: &DisplaySnapshot,
787 head: DisplayPoint,
788 is_boundary: &mut dyn FnMut(char, char) -> bool,
789) -> (Option<DisplayPoint>, DisplayPoint) {
790 let mut offset = head.to_offset(map, Bias::Right);
791 let mut trail_offset = None;
792
793 let mut prev_ch = map.buffer_snapshot().reversed_chars_at(offset).next();
794 let mut forward = map.buffer_snapshot().chars_at(offset).peekable();
795
796 // Skip newlines
797 while let Some(&ch) = forward.peek() {
798 if ch == '\n' {
799 prev_ch = forward.next();
800 offset += ch.len_utf8();
801 trail_offset = Some(offset);
802 } else {
803 break;
804 }
805 }
806
807 // Find the boundary
808 let start_offset = offset;
809 for ch in forward {
810 if let Some(prev_ch) = prev_ch
811 && is_boundary(prev_ch, ch)
812 {
813 if start_offset == offset {
814 trail_offset = Some(offset);
815 } else {
816 break;
817 }
818 }
819 offset += ch.len_utf8();
820 prev_ch = Some(ch);
821 }
822
823 let trail = trail_offset
824 .map(|trail_offset| map.clip_point(trail_offset.to_display_point(map), Bias::Right));
825
826 (
827 trail,
828 map.clip_point(offset.to_display_point(map), Bias::Right),
829 )
830}
831
832pub fn find_boundary(
833 map: &DisplaySnapshot,
834 from: DisplayPoint,
835 find_range: FindRange,
836 is_boundary: &mut dyn FnMut(char, char) -> bool,
837) -> DisplayPoint {
838 find_boundary_point(map, from, find_range, is_boundary, false)
839}
840
841pub fn find_boundary_exclusive(
842 map: &DisplaySnapshot,
843 from: DisplayPoint,
844 find_range: FindRange,
845 is_boundary: &mut dyn FnMut(char, char) -> bool,
846) -> DisplayPoint {
847 find_boundary_point(map, from, find_range, is_boundary, true)
848}
849
850/// Returns an iterator over the characters following a given offset in the [`DisplaySnapshot`].
851/// The returned value also contains a range of the start/end of a returned character in
852/// the [`DisplaySnapshot`]. The offsets are relative to the start of a buffer.
853pub fn chars_after(
854 map: &DisplaySnapshot,
855 mut offset: MultiBufferOffset,
856) -> impl Iterator<Item = (char, Range<MultiBufferOffset>)> + '_ {
857 map.buffer_snapshot().chars_at(offset).map(move |ch| {
858 let before = offset;
859 offset += ch.len_utf8();
860 (ch, before..offset)
861 })
862}
863
864/// Returns a reverse iterator over the characters following a given offset in the [`DisplaySnapshot`].
865/// The returned value also contains a range of the start/end of a returned character in
866/// the [`DisplaySnapshot`]. The offsets are relative to the start of a buffer.
867pub fn chars_before(
868 map: &DisplaySnapshot,
869 mut offset: MultiBufferOffset,
870) -> impl Iterator<Item = (char, Range<MultiBufferOffset>)> + '_ {
871 map.buffer_snapshot()
872 .reversed_chars_at(offset)
873 .map(move |ch| {
874 let after = offset;
875 offset -= ch.len_utf8();
876 (ch, offset..after)
877 })
878}
879
880/// Returns a list of lines (represented as a [`DisplayPoint`] range) contained
881/// within a passed range.
882///
883/// The line ranges are **always* going to be in bounds of a requested range, which means that
884/// the first and the last lines might not necessarily represent the
885/// full range of a logical line (as their `.start`/`.end` values are clipped to those of a passed in range).
886pub fn split_display_range_by_lines(
887 map: &DisplaySnapshot,
888 range: Range<DisplayPoint>,
889) -> Vec<Range<DisplayPoint>> {
890 let mut result = Vec::new();
891
892 let mut start = range.start;
893 // Loop over all the covered rows until the one containing the range end
894 for row in range.start.row().0..range.end.row().0 {
895 let row_end_column = map.line_len(DisplayRow(row));
896 let end = map.clip_point(
897 DisplayPoint::new(DisplayRow(row), row_end_column),
898 Bias::Left,
899 );
900 if start != end {
901 result.push(start..end);
902 }
903 start = map.clip_point(DisplayPoint::new(DisplayRow(row + 1), 0), Bias::Left);
904 }
905
906 // Add the final range from the start of the last end to the original range end.
907 result.push(start..range.end);
908
909 result
910}
911
912#[cfg(test)]
913mod tests {
914 use super::*;
915 use crate::{
916 Buffer, DisplayMap, DisplayRow, FoldPlaceholder, MultiBuffer,
917 inlays::Inlay,
918 test::{editor_test_context::EditorTestContext, marked_display_snapshot},
919 };
920 use gpui::{AppContext as _, font, px};
921 use language::Capability;
922 use multi_buffer::PathKey;
923 use project::project_settings::DiagnosticSeverity;
924 use settings::SettingsStore;
925 use util::post_inc;
926
927 #[gpui::test]
928 fn test_previous_word_start(cx: &mut gpui::App) {
929 init_test(cx);
930
931 fn assert(marked_text: &str, cx: &mut gpui::App) {
932 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
933 let actual = previous_word_start(&snapshot, display_points[1]);
934 let expected = display_points[0];
935 if actual != expected {
936 eprintln!(
937 "previous_word_start mismatch for '{}': actual={:?}, expected={:?}",
938 marked_text, actual, expected
939 );
940 }
941 assert_eq!(actual, expected);
942 }
943
944 assert("\nˇ ˇlorem", cx);
945 assert("ˇ\nˇ lorem", cx);
946 assert(" ˇloremˇ", cx);
947 assert("ˇ ˇlorem", cx);
948 assert(" ˇlorˇem", cx);
949 assert("\nlorem\nˇ ˇipsum", cx);
950 assert("\n\nˇ\nˇ", cx);
951 assert(" ˇlorem ˇipsum", cx);
952 assert("ˇlorem-ˇipsum", cx);
953 assert("loremˇ-#$@ˇipsum", cx);
954 assert("ˇlorem_ˇipsum", cx);
955 assert(" ˇdefγˇ", cx);
956 assert(" ˇbcΔˇ", cx);
957 // Test punctuation skipping behavior
958 assert("ˇhello.ˇ", cx);
959 assert("helloˇ...ˇ", cx);
960 assert("helloˇ.---..ˇtest", cx);
961 assert("test ˇ.--ˇtest", cx);
962 assert("oneˇ,;:!?ˇtwo", cx);
963 }
964
965 #[gpui::test]
966 fn test_previous_subword_start(cx: &mut gpui::App) {
967 init_test(cx);
968
969 fn assert(marked_text: &str, cx: &mut gpui::App) {
970 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
971 assert_eq!(
972 previous_subword_start(&snapshot, display_points[1]),
973 display_points[0]
974 );
975 }
976
977 // Subword boundaries are respected
978 assert("loremˇ_ˇipsum", cx);
979 assert("lorem_ˇipsumˇ", cx);
980 assert("ˇloremˇ_ipsum", cx);
981 assert("lorem_ˇipsumˇ_dolor", cx);
982 assert("loremˇIpˇsum", cx);
983 assert("loremˇIpsumˇ", cx);
984
985 // Word boundaries are still respected
986 assert("\nˇ ˇlorem", cx);
987 assert(" ˇloremˇ", cx);
988 assert(" ˇlorˇem", cx);
989 assert("\nlorem\nˇ ˇipsum", cx);
990 assert("\n\nˇ\nˇ", cx);
991 assert(" ˇlorem ˇipsum", cx);
992 assert("loremˇ-ˇipsum", cx);
993 assert("loremˇ-#$@ˇipsum", cx);
994 assert(" ˇdefγˇ", cx);
995 assert(" bcˇΔˇ", cx);
996 assert(" ˇbcδˇ", cx);
997 assert(" abˇ——ˇcd", cx);
998 }
999
1000 #[gpui::test]
1001 fn test_find_preceding_boundary(cx: &mut gpui::App) {
1002 init_test(cx);
1003
1004 fn assert(
1005 marked_text: &str,
1006 cx: &mut gpui::App,
1007 is_boundary: &mut dyn FnMut(char, char) -> bool,
1008 ) {
1009 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1010 assert_eq!(
1011 find_preceding_boundary_display_point(
1012 &snapshot,
1013 display_points[1],
1014 FindRange::MultiLine,
1015 is_boundary
1016 ),
1017 display_points[0]
1018 );
1019 }
1020
1021 assert("abcˇdef\ngh\nijˇk", cx, &mut |left, right| {
1022 left == 'c' && right == 'd'
1023 });
1024 assert("abcdef\nˇgh\nijˇk", cx, &mut |left, right| {
1025 left == '\n' && right == 'g'
1026 });
1027 let mut line_count = 0;
1028 assert("abcdef\nˇgh\nijˇk", cx, &mut |left, _| {
1029 if left == '\n' {
1030 line_count += 1;
1031 line_count == 2
1032 } else {
1033 false
1034 }
1035 });
1036 }
1037
1038 #[gpui::test]
1039 fn test_find_preceding_boundary_with_inlays(cx: &mut gpui::App) {
1040 init_test(cx);
1041
1042 let input_text = "abcdefghijklmnopqrstuvwxys";
1043 let font = font("Helvetica");
1044 let font_size = px(14.0);
1045 let buffer = MultiBuffer::build_simple(input_text, cx);
1046 let buffer_snapshot = buffer.read(cx).snapshot(cx);
1047
1048 let display_map = cx.new(|cx| {
1049 DisplayMap::new(
1050 buffer,
1051 font,
1052 font_size,
1053 None,
1054 1,
1055 1,
1056 FoldPlaceholder::test(),
1057 DiagnosticSeverity::Warning,
1058 cx,
1059 )
1060 });
1061
1062 // add all kinds of inlays between two word boundaries: we should be able to cross them all, when looking for another boundary
1063 let mut id = 0;
1064 let inlays = (0..buffer_snapshot.len().0)
1065 .flat_map(|offset| {
1066 let offset = MultiBufferOffset(offset);
1067 [
1068 Inlay::edit_prediction(
1069 post_inc(&mut id),
1070 buffer_snapshot.anchor_before(offset),
1071 "test",
1072 ),
1073 Inlay::edit_prediction(
1074 post_inc(&mut id),
1075 buffer_snapshot.anchor_after(offset),
1076 "test",
1077 ),
1078 Inlay::mock_hint(
1079 post_inc(&mut id),
1080 buffer_snapshot.anchor_before(offset),
1081 "test",
1082 ),
1083 Inlay::mock_hint(
1084 post_inc(&mut id),
1085 buffer_snapshot.anchor_after(offset),
1086 "test",
1087 ),
1088 ]
1089 })
1090 .collect();
1091 let snapshot = display_map.update(cx, |map, cx| {
1092 map.splice_inlays(&[], inlays, cx);
1093 map.snapshot(cx)
1094 });
1095
1096 assert_eq!(
1097 find_preceding_boundary_display_point(
1098 &snapshot,
1099 buffer_snapshot.len().to_display_point(&snapshot),
1100 FindRange::MultiLine,
1101 &mut |left, _| left == 'e',
1102 ),
1103 snapshot
1104 .buffer_snapshot()
1105 .offset_to_point(MultiBufferOffset(5))
1106 .to_display_point(&snapshot),
1107 "Should not stop at inlays when looking for boundaries"
1108 );
1109 }
1110
1111 #[gpui::test]
1112 fn test_next_word_end(cx: &mut gpui::App) {
1113 init_test(cx);
1114
1115 fn assert(marked_text: &str, cx: &mut gpui::App) {
1116 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1117 let actual = next_word_end(&snapshot, display_points[0]);
1118 let expected = display_points[1];
1119 if actual != expected {
1120 eprintln!(
1121 "next_word_end mismatch for '{}': actual={:?}, expected={:?}",
1122 marked_text, actual, expected
1123 );
1124 }
1125 assert_eq!(actual, expected);
1126 }
1127
1128 assert("\nˇ loremˇ", cx);
1129 assert(" ˇloremˇ", cx);
1130 assert(" lorˇemˇ", cx);
1131 assert(" loremˇ ˇ\nipsum\n", cx);
1132 assert("\nˇ\nˇ\n\n", cx);
1133 assert("loremˇ ipsumˇ ", cx);
1134 assert("loremˇ-ipsumˇ", cx);
1135 assert("loremˇ#$@-ˇipsum", cx);
1136 assert("loremˇ_ipsumˇ", cx);
1137 assert(" ˇbcΔˇ", cx);
1138 assert(" abˇ——ˇcd", cx);
1139 // Test punctuation skipping behavior
1140 assert("ˇ.helloˇ", cx);
1141 assert("display_pointsˇ[0ˇ]", cx);
1142 assert("ˇ...ˇhello", cx);
1143 assert("helloˇ.---..ˇtest", cx);
1144 assert("testˇ.--ˇ test", cx);
1145 assert("oneˇ,;:!?ˇtwo", cx);
1146 }
1147
1148 #[gpui::test]
1149 fn test_next_subword_end(cx: &mut gpui::App) {
1150 init_test(cx);
1151
1152 fn assert(marked_text: &str, cx: &mut gpui::App) {
1153 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1154 assert_eq!(
1155 next_subword_end(&snapshot, display_points[0]),
1156 display_points[1]
1157 );
1158 }
1159
1160 // Subword boundaries are respected
1161 assert("loremˇ_ˇipsum", cx);
1162 assert("ˇloremˇ_ipsum", cx);
1163 assert("loremˇ_ˇipsum", cx);
1164 assert("lorem_ˇipsumˇ_dolor", cx);
1165 assert("loˇremˇIpsum", cx);
1166 assert("loremˇIpsumˇDolor", cx);
1167
1168 // Word boundaries are still respected
1169 assert("\nˇ loremˇ", cx);
1170 assert(" ˇloremˇ", cx);
1171 assert(" lorˇemˇ", cx);
1172 assert(" loremˇ ˇ\nipsum\n", cx);
1173 assert("\nˇ\nˇ\n\n", cx);
1174 assert("loremˇ ipsumˇ ", cx);
1175 assert("loremˇ-ˇipsum", cx);
1176 assert("loremˇ#$@-ˇipsum", cx);
1177 assert("loremˇ_ˇipsum", cx);
1178 assert(" ˇbcˇΔ", cx);
1179 assert(" abˇ——ˇcd", cx);
1180 }
1181
1182 #[gpui::test]
1183 fn test_find_boundary(cx: &mut gpui::App) {
1184 init_test(cx);
1185
1186 fn assert(
1187 marked_text: &str,
1188 cx: &mut gpui::App,
1189 is_boundary: &mut dyn FnMut(char, char) -> bool,
1190 ) {
1191 let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
1192 assert_eq!(
1193 find_boundary(
1194 &snapshot,
1195 display_points[0],
1196 FindRange::MultiLine,
1197 is_boundary,
1198 ),
1199 display_points[1]
1200 );
1201 }
1202
1203 assert("abcˇdef\ngh\nijˇk", cx, &mut |left, right| {
1204 left == 'j' && right == 'k'
1205 });
1206 assert("abˇcdef\ngh\nˇijk", cx, &mut |left, right| {
1207 left == '\n' && right == 'i'
1208 });
1209 let mut line_count = 0;
1210 assert("abcˇdef\ngh\nˇijk", cx, &mut |left, _| {
1211 if left == '\n' {
1212 line_count += 1;
1213 line_count == 2
1214 } else {
1215 false
1216 }
1217 });
1218 }
1219
1220 #[gpui::test]
1221 async fn test_move_up_and_down_with_excerpts(cx: &mut gpui::TestAppContext) {
1222 cx.update(|cx| {
1223 init_test(cx);
1224 });
1225
1226 let mut cx = EditorTestContext::new(cx).await;
1227 let editor = cx.editor.clone();
1228 let window = cx.window;
1229 _ = cx.update_window(window, |_, window, cx| {
1230 let text_layout_details =
1231 editor.update(cx, |editor, cx| editor.text_layout_details(window, cx));
1232
1233 let font = font("Helvetica");
1234
1235 let buffer = cx.new(|cx| Buffer::local("abc\ndefg\na\na\na\nhijkl\nmn", cx));
1236 let multibuffer = cx.new(|cx| {
1237 let mut multibuffer = MultiBuffer::new(Capability::ReadWrite);
1238 multibuffer.set_excerpts_for_path(
1239 PathKey::sorted(0),
1240 buffer.clone(),
1241 [
1242 Point::new(0, 0)..Point::new(1, 4),
1243 Point::new(5, 0)..Point::new(6, 2),
1244 ],
1245 0,
1246 cx,
1247 );
1248 multibuffer
1249 });
1250 let display_map = cx.new(|cx| {
1251 DisplayMap::new(
1252 multibuffer,
1253 font,
1254 px(14.0),
1255 None,
1256 0,
1257 1,
1258 FoldPlaceholder::test(),
1259 DiagnosticSeverity::Warning,
1260 cx,
1261 )
1262 });
1263 let snapshot = display_map.update(cx, |map, cx| map.snapshot(cx));
1264
1265 assert_eq!(snapshot.text(), "abc\ndefg\n\nhijkl\nmn");
1266
1267 let col_2_x = snapshot
1268 .x_for_display_point(DisplayPoint::new(DisplayRow(0), 2), &text_layout_details);
1269
1270 // Can't move up into the first excerpt's header
1271 assert_eq!(
1272 up(
1273 &snapshot,
1274 DisplayPoint::new(DisplayRow(0), 2),
1275 SelectionGoal::HorizontalPosition(f64::from(col_2_x)),
1276 false,
1277 &text_layout_details
1278 ),
1279 (
1280 DisplayPoint::new(DisplayRow(0), 0),
1281 SelectionGoal::HorizontalPosition(f64::from(col_2_x)),
1282 ),
1283 );
1284 assert_eq!(
1285 up(
1286 &snapshot,
1287 DisplayPoint::new(DisplayRow(0), 0),
1288 SelectionGoal::None,
1289 false,
1290 &text_layout_details
1291 ),
1292 (
1293 DisplayPoint::new(DisplayRow(0), 0),
1294 SelectionGoal::HorizontalPosition(0.0),
1295 ),
1296 );
1297
1298 let col_4_x = snapshot
1299 .x_for_display_point(DisplayPoint::new(DisplayRow(1), 4), &text_layout_details);
1300
1301 // Move up and down within first excerpt
1302 assert_eq!(
1303 up(
1304 &snapshot,
1305 DisplayPoint::new(DisplayRow(1), 4),
1306 SelectionGoal::HorizontalPosition(col_4_x.into()),
1307 false,
1308 &text_layout_details
1309 ),
1310 (
1311 DisplayPoint::new(DisplayRow(0), 3),
1312 SelectionGoal::HorizontalPosition(col_4_x.into())
1313 ),
1314 );
1315 assert_eq!(
1316 down(
1317 &snapshot,
1318 DisplayPoint::new(DisplayRow(0), 3),
1319 SelectionGoal::HorizontalPosition(col_4_x.into()),
1320 false,
1321 &text_layout_details
1322 ),
1323 (
1324 DisplayPoint::new(DisplayRow(1), 4),
1325 SelectionGoal::HorizontalPosition(col_4_x.into())
1326 ),
1327 );
1328
1329 let col_5_x = snapshot
1330 .x_for_display_point(DisplayPoint::new(DisplayRow(3), 5), &text_layout_details);
1331
1332 // Move up and down across second excerpt's header
1333 assert_eq!(
1334 up(
1335 &snapshot,
1336 DisplayPoint::new(DisplayRow(3), 5),
1337 SelectionGoal::HorizontalPosition(col_5_x.into()),
1338 false,
1339 &text_layout_details
1340 ),
1341 (
1342 DisplayPoint::new(DisplayRow(1), 4),
1343 SelectionGoal::HorizontalPosition(col_5_x.into())
1344 ),
1345 );
1346 assert_eq!(
1347 down(
1348 &snapshot,
1349 DisplayPoint::new(DisplayRow(1), 4),
1350 SelectionGoal::HorizontalPosition(col_5_x.into()),
1351 false,
1352 &text_layout_details
1353 ),
1354 (
1355 DisplayPoint::new(DisplayRow(3), 5),
1356 SelectionGoal::HorizontalPosition(col_5_x.into())
1357 ),
1358 );
1359
1360 let max_point_x = snapshot
1361 .x_for_display_point(DisplayPoint::new(DisplayRow(4), 2), &text_layout_details);
1362
1363 // Can't move down off the end, and attempting to do so leaves the selection goal unchanged
1364 assert_eq!(
1365 down(
1366 &snapshot,
1367 DisplayPoint::new(DisplayRow(4), 0),
1368 SelectionGoal::HorizontalPosition(0.0),
1369 false,
1370 &text_layout_details
1371 ),
1372 (
1373 DisplayPoint::new(DisplayRow(4), 2),
1374 SelectionGoal::HorizontalPosition(0.0)
1375 ),
1376 );
1377 assert_eq!(
1378 down(
1379 &snapshot,
1380 DisplayPoint::new(DisplayRow(4), 2),
1381 SelectionGoal::HorizontalPosition(max_point_x.into()),
1382 false,
1383 &text_layout_details
1384 ),
1385 (
1386 DisplayPoint::new(DisplayRow(4), 2),
1387 SelectionGoal::HorizontalPosition(max_point_x.into())
1388 ),
1389 );
1390 });
1391 }
1392
1393 fn init_test(cx: &mut gpui::App) {
1394 let settings_store = SettingsStore::test(cx);
1395 cx.set_global(settings_store);
1396 theme::init(theme::LoadThemes::JustBase, cx);
1397 crate::init(cx);
1398 }
1399}