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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).
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);
let open_pos = search::find_nth_prev(text, open, pos, n, true)?;
let close_pos = search::find_nth_next(text, close, pos, 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 head = range.head;
match find_nth_pairs_pos(text, ch, head, skip) {
Some((open_pos, close_pos)) => {
if change_pos.contains(&open_pos) || change_pos.contains(&close_pos) {
return None;
}
change_pos.extend_from_slice(&[open_pos, close_pos]);
}
None => return None,
}
}
Some(change_pos)
}
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