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Improve coords_at_pos & pos_at_coords, test with graphemes.

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This commit is contained in:
Blaž Hrastnik 2021-02-24 16:08:17 +09:00
parent 87a6d4e736
commit f118e7580f
1 changed files with 38 additions and 5 deletions
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43
helix-core/src/state.rs
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@ -217,7 +217,7 @@ impl State {
pub fn coords_at_pos(text: RopeSlice, pos: usize) -> Position {
let line = text.char_to_line(pos);
let line_start = text.line_to_char(line);
let col = text.slice(line_start..pos).len_chars();
let col = RopeGraphemes::new(text.slice(line_start..pos)).count();
Position::new(line, col)
}
@ -225,6 +225,7 @@ pub fn coords_at_pos(text: RopeSlice, pos: usize) -> Position {
pub fn pos_at_coords(text: RopeSlice, coords: Position) -> usize {
let Position { row, col } = coords;
let line_start = text.line_to_char(row);
// line_start + col
nth_next_grapheme_boundary(text, line_start, col)
}
@ -320,11 +321,26 @@ mod test {
fn test_coords_at_pos() {
let text = Rope::from("ḧëḷḷö\nẅöṛḷḋ");
let slice = text.slice(..);
// assert_eq!(coords_at_pos(slice, 0), (0, 0).into());
// assert_eq!(coords_at_pos(slice, 5), (0, 5).into()); // position on \n
// assert_eq!(coords_at_pos(slice, 6), (1, 0).into()); // position on w
// assert_eq!(coords_at_pos(slice, 7), (1, 1).into()); // position on o
// assert_eq!(coords_at_pos(slice, 10), (1, 4).into()); // position on d
// test with grapheme clusters
let text = Rope::from("a̐éö̲\r\n");
let slice = text.slice(..);
assert_eq!(coords_at_pos(slice, 0), (0, 0).into());
assert_eq!(coords_at_pos(slice, 5), (0, 5).into()); // position on \n
assert_eq!(coords_at_pos(slice, 6), (1, 0).into()); // position on w
assert_eq!(coords_at_pos(slice, 7), (1, 1).into()); // position on o
assert_eq!(coords_at_pos(slice, 10), (1, 4).into()); // position on d
assert_eq!(coords_at_pos(slice, 2), (0, 1).into());
assert_eq!(coords_at_pos(slice, 4), (0, 2).into());
assert_eq!(coords_at_pos(slice, 7), (0, 3).into());
let text = Rope::from("किमपि");
let slice = text.slice(..);
assert_eq!(coords_at_pos(slice, 0), (0, 0).into());
assert_eq!(coords_at_pos(slice, 2), (0, 1).into());
assert_eq!(coords_at_pos(slice, 3), (0, 2).into());
assert_eq!(coords_at_pos(slice, 5), (0, 3).into());
}
#[test]
@ -336,6 +352,23 @@ mod test {
assert_eq!(pos_at_coords(slice, (1, 0).into()), 6); // position on w
assert_eq!(pos_at_coords(slice, (1, 1).into()), 7); // position on o
assert_eq!(pos_at_coords(slice, (1, 4).into()), 10); // position on d
// test with grapheme clusters
let text = Rope::from("a̐éö̲\r\n");
let slice = text.slice(..);
assert_eq!(pos_at_coords(slice, (0, 0).into()), 0);
assert_eq!(pos_at_coords(slice, (0, 1).into()), 2);
assert_eq!(pos_at_coords(slice, (0, 2).into()), 4);
assert_eq!(pos_at_coords(slice, (0, 3).into()), 7); // \r\n is one char here
assert_eq!(pos_at_coords(slice, (0, 4).into()), 9);
let text = Rope::from("किमपि");
// 2 - 1 - 2 codepoints
// TODO: delete handling as per https://news.ycombinator.com/item?id=20058454
let slice = text.slice(..);
assert_eq!(pos_at_coords(slice, (0, 0).into()), 0);
assert_eq!(pos_at_coords(slice, (0, 1).into()), 2);
assert_eq!(pos_at_coords(slice, (0, 2).into()), 3);
assert_eq!(pos_at_coords(slice, (0, 3).into()), 5); // eol
}
#[test]