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|
use crate::{search, Selection};
use ropey::RopeSlice;
pub const PAIRS: &[(char, char)] = &[
('(', ')'),
('[', ']'),
('{', '}'),
('<', '>'),
('«', '»'),
('「', '」'),
('（', '）'),
];
/// Given any char in [PAIRS], return the open and closing chars. If not found in
/// [PAIRS] return (ch, ch).
///
/// ```
/// use helix_core::surround::get_pair;
///
/// assert_eq!(get_pair('['), ('[', ']'));
/// assert_eq!(get_pair('}'), ('{', '}'));
/// assert_eq!(get_pair('"'), ('"', '"'));
/// ```
pub fn get_pair(ch: char) -> (char, char) {
PAIRS
.iter()
.find(|(open, close)| *open == ch || *close == ch)
.copied()
.unwrap_or((ch, ch))
}
/// Find the position of surround pairs of `ch` which can be either a closing
/// or opening pair. `n` will skip n - 1 pairs (eg. n=2 will discard (only)
/// the first pair found and keep looking)
pub fn find_nth_pairs_pos(
text: RopeSlice,
ch: char,
pos: usize,
n: usize,
) -> Option<(usize, usize)> {
let (open, close) = get_pair(ch);
// find_nth* do not consider current character; +1/-1 to include them
let open_pos = search::find_nth_prev(text, open, pos + 1, n, true)?;
let close_pos = search::find_nth_next(text, close, pos - 1, n, true)?;
Some((open_pos, close_pos))
}
/// Find position of surround characters around every cursor. Returns None
/// if any positions overlap. Note that the positions are in a flat Vec.
/// Use get_surround_pos().chunks(2) to get matching pairs of surround positions.
/// `ch` can be either closing or opening pair.
pub fn get_surround_pos(
text: RopeSlice,
selection: &Selection,
ch: char,
skip: usize,
) -> Option<Vec<usize>> {
let mut change_pos = Vec::new();
for range in selection {
let (open_pos, close_pos) = find_nth_pairs_pos(text, ch, range.head, skip)?;
if change_pos.contains(&open_pos) || change_pos.contains(&close_pos) {
return None;
}
change_pos.extend_from_slice(&[open_pos, close_pos]);
}
Some(change_pos)
}
#[cfg(test)]
mod test {
use super::*;
use crate::Range;
use ropey::Rope;
use smallvec::SmallVec;
#[test]
fn test_find_nth_pairs_pos() {
let doc = Rope::from("some (text) here");
let slice = doc.slice(..);
// cursor on [t]ext
assert_eq!(find_nth_pairs_pos(slice, '(', 6, 1), Some((5, 10)));
assert_eq!(find_nth_pairs_pos(slice, ')', 6, 1), Some((5, 10)));
// cursor on so[m]e
assert_eq!(find_nth_pairs_pos(slice, '(', 2, 1), None);
// cursor on bracket itself
assert_eq!(find_nth_pairs_pos(slice, '(', 5, 1), Some((5, 10)));
}
#[test]
fn test_find_nth_pairs_pos_skip() {
let doc = Rope::from("(so (many (good) text) here)");
let slice = doc.slice(..);
// cursor on go[o]d
assert_eq!(find_nth_pairs_pos(slice, '(', 13, 1), Some((10, 15)));
assert_eq!(find_nth_pairs_pos(slice, '(', 13, 2), Some((4, 21)));
assert_eq!(find_nth_pairs_pos(slice, '(', 13, 3), Some((0, 27)));
}
#[test]
fn test_find_nth_pairs_pos_mixed() {
let doc = Rope::from("(so [many {good} text] here)");
let slice = doc.slice(..);
// cursor on go[o]d
assert_eq!(find_nth_pairs_pos(slice, '{', 13, 1), Some((10, 15)));
assert_eq!(find_nth_pairs_pos(slice, '[', 13, 1), Some((4, 21)));
assert_eq!(find_nth_pairs_pos(slice, '(', 13, 1), Some((0, 27)));
}
#[test]
fn test_get_surround_pos() {
let doc = Rope::from("(some) (chars)\n(newline)");
let slice = doc.slice(..);
let selection = Selection::new(
SmallVec::from_slice(&[Range::point(2), Range::point(9), Range::point(20)]),
0,
);
// cursor on s[o]me, c[h]ars, newl[i]ne
assert_eq!(
get_surround_pos(slice, &selection, '(', 1)
.unwrap()
.as_slice(),
&[0, 5, 7, 13, 15, 23]
);
}
#[test]
fn test_get_surround_pos_bail() {
let doc = Rope::from("[some]\n(chars)xx\n(newline)");
let slice = doc.slice(..);
let selection =
Selection::new(SmallVec::from_slice(&[Range::point(2), Range::point(9)]), 0);
// cursor on s[o]me, c[h]ars
assert_eq!(
get_surround_pos(slice, &selection, '(', 1),
None // different surround chars
);
let selection = Selection::new(
SmallVec::from_slice(&[Range::point(14), Range::point(24)]),
0,
);
// cursor on [x]x, newli[n]e
assert_eq!(
get_surround_pos(slice, &selection, '(', 1),
None // overlapping surround chars
);
}
}
|
