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use crate::{search, Selection};
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use ropey::RopeSlice;
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pub const PAIRS: &[(char, char)] = &[
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('(', ')'),
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('[', ']'),
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('{', '}'),
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('<', '>'),
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('«', '»'),
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('「', '」'),
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('（', '）'),
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];
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/// Given any char in [PAIRS], return the open and closing chars. If not found in
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/// [PAIRS] return (ch, ch).
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///
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/// ```
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/// use helix_core::surround::get_pair;
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///
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/// assert_eq!(get_pair('['), ('[', ']'));
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/// assert_eq!(get_pair('}'), ('{', '}'));
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/// assert_eq!(get_pair('"'), ('"', '"'));
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/// ```
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pub fn get_pair(ch: char) -> (char, char) {
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PAIRS
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.iter()
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.find(|(open, close)| *open == ch || *close == ch)
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.copied()
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.unwrap_or((ch, ch))
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}
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/// Find the position of surround pairs of `ch` which can be either a closing
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/// or opening pair. `n` will skip n - 1 pairs (eg. n=2 will discard (only)
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/// the first pair found and keep looking)
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pub fn find_nth_pairs_pos(
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text: RopeSlice,
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ch: char,
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pos: usize,
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n: usize,
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) -> Option<(usize, usize)> {
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let (open, close) = get_pair(ch);
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if text.len_chars() < 2 || pos >= text.len_chars() {
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return None;
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}
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if open == close {
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if Some(open) == text.get_char(pos) {
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// Special case: cursor is directly on a matching char.
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match pos {
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0 => Some((pos, search::find_nth_next(text, close, pos + 1, n)?)),
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_ if (pos + 1) == text.len_chars() => {
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Some((search::find_nth_prev(text, open, pos, n)?, pos))
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}
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// We return no match because there's no way to know which
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// side of the char we should be searching on.
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_ => None,
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}
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} else {
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Some((
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search::find_nth_prev(text, open, pos, n)?,
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search::find_nth_next(text, close, pos, n)?,
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))
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}
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} else {
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Some((
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find_nth_open_pair(text, open, close, pos, n)?,
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find_nth_close_pair(text, open, close, pos, n)?,
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))
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}
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}
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fn find_nth_open_pair(
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text: RopeSlice,
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open: char,
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close: char,
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mut pos: usize,
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n: usize,
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) -> Option<usize> {
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let mut chars = text.chars_at(pos + 1);
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// Adjusts pos for the first iteration, and handles the case of the
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// cursor being *on* the close character which will get falsely stepped over
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// if not skipped here
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if chars.prev()? == open {
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return Some(pos);
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}
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for _ in 0..n {
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let mut step_over: usize = 0;
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loop {
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let c = chars.prev()?;
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pos = pos.saturating_sub(1);
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// ignore other surround pairs that are enclosed *within* our search scope
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if c == close {
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step_over += 1;
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} else if c == open {
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if step_over == 0 {
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break;
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}
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step_over = step_over.saturating_sub(1);
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}
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}
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}
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Some(pos)
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}
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fn find_nth_close_pair(
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text: RopeSlice,
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open: char,
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close: char,
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mut pos: usize,
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n: usize,
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) -> Option<usize> {
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if pos >= text.len_chars() {
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return None;
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}
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let mut chars = text.chars_at(pos);
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if chars.next()? == close {
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return Some(pos);
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}
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for _ in 0..n {
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let mut step_over: usize = 0;
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loop {
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let c = chars.next()?;
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pos += 1;
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if c == open {
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step_over += 1;
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} else if c == close {
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if step_over == 0 {
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break;
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}
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step_over = step_over.saturating_sub(1);
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}
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}
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}
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Some(pos)
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}
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/// Find position of surround characters around every cursor. Returns None
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/// if any positions overlap. Note that the positions are in a flat Vec.
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/// Use get_surround_pos().chunks(2) to get matching pairs of surround positions.
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/// `ch` can be either closing or opening pair.
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pub fn get_surround_pos(
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text: RopeSlice,
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selection: &Selection,
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ch: char,
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skip: usize,
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) -> Option<Vec<usize>> {
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let mut change_pos = Vec::new();
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for range in selection {
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let (open_pos, close_pos) = find_nth_pairs_pos(text, ch, range.head, skip)?;
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if change_pos.contains(&open_pos) || change_pos.contains(&close_pos) {
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return None;
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}
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change_pos.extend_from_slice(&[open_pos, close_pos]);
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}
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Some(change_pos)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::Range;
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use ropey::Rope;
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use smallvec::SmallVec;
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#[test]
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fn test_find_nth_pairs_pos() {
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let doc = Rope::from("some (text) here");
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let slice = doc.slice(..);
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// cursor on [t]ext
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assert_eq!(find_nth_pairs_pos(slice, '(', 6, 1), Some((5, 10)));
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assert_eq!(find_nth_pairs_pos(slice, ')', 6, 1), Some((5, 10)));
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// cursor on so[m]e
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assert_eq!(find_nth_pairs_pos(slice, '(', 2, 1), None);
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// cursor on bracket itself
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assert_eq!(find_nth_pairs_pos(slice, '(', 5, 1), Some((5, 10)));
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assert_eq!(find_nth_pairs_pos(slice, '(', 10, 1), Some((5, 10)));
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}
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#[test]
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fn test_find_nth_pairs_pos_skip() {
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let doc = Rope::from("(so (many (good) text) here)");
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let slice = doc.slice(..);
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// cursor on go[o]d
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assert_eq!(find_nth_pairs_pos(slice, '(', 13, 1), Some((10, 15)));
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assert_eq!(find_nth_pairs_pos(slice, '(', 13, 2), Some((4, 21)));
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assert_eq!(find_nth_pairs_pos(slice, '(', 13, 3), Some((0, 27)));
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}
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#[test]
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fn test_find_nth_pairs_pos_same() {
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let doc = Rope::from("'so 'many 'good' text' here'");
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let slice = doc.slice(..);
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// cursor on go[o]d
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assert_eq!(find_nth_pairs_pos(slice, '\'', 13, 1), Some((10, 15)));
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assert_eq!(find_nth_pairs_pos(slice, '\'', 13, 2), Some((4, 21)));
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assert_eq!(find_nth_pairs_pos(slice, '\'', 13, 3), Some((0, 27)));
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// cursor on the quotes
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assert_eq!(find_nth_pairs_pos(slice, '\'', 10, 1), None);
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// this is the best we can do since opening and closing pairs are same
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assert_eq!(find_nth_pairs_pos(slice, '\'', 0, 1), Some((0, 4)));
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assert_eq!(find_nth_pairs_pos(slice, '\'', 27, 1), Some((21, 27)));
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}
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#[test]
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fn test_find_nth_pairs_pos_step() {
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let doc = Rope::from("((so)((many) good (text))(here))");
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let slice = doc.slice(..);
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// cursor on go[o]d
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assert_eq!(find_nth_pairs_pos(slice, '(', 15, 1), Some((5, 24)));
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assert_eq!(find_nth_pairs_pos(slice, '(', 15, 2), Some((0, 31)));
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}
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#[test]
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fn test_find_nth_pairs_pos_mixed() {
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let doc = Rope::from("(so [many {good} text] here)");
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let slice = doc.slice(..);
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// cursor on go[o]d
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assert_eq!(find_nth_pairs_pos(slice, '{', 13, 1), Some((10, 15)));
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assert_eq!(find_nth_pairs_pos(slice, '[', 13, 1), Some((4, 21)));
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assert_eq!(find_nth_pairs_pos(slice, '(', 13, 1), Some((0, 27)));
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}
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#[test]
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fn test_get_surround_pos() {
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let doc = Rope::from("(some) (chars)\n(newline)");
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let slice = doc.slice(..);
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let selection = Selection::new(
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SmallVec::from_slice(&[Range::point(2), Range::point(9), Range::point(20)]),
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0,
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);
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// cursor on s[o]me, c[h]ars, newl[i]ne
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assert_eq!(
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get_surround_pos(slice, &selection, '(', 1)
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.unwrap()
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.as_slice(),
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&[0, 5, 7, 13, 15, 23]
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);
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}
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#[test]
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fn test_get_surround_pos_bail() {
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let doc = Rope::from("[some]\n(chars)xx\n(newline)");
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let slice = doc.slice(..);
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let selection =
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Selection::new(SmallVec::from_slice(&[Range::point(2), Range::point(9)]), 0);
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// cursor on s[o]me, c[h]ars
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assert_eq!(
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get_surround_pos(slice, &selection, '(', 1),
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None // different surround chars
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);
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let selection = Selection::new(
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SmallVec::from_slice(&[Range::point(14), Range::point(24)]),
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0,
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);
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// cursor on [x]x, newli[n]e
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assert_eq!(
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get_surround_pos(slice, &selection, '(', 1),
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None // overlapping surround chars
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);
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}
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}
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