feat(core): add plaintext matching fallback to tree-sitter matching (#4288)

pull/7240/head
Alex Vinyals 1 year ago committed by GitHub
parent 428d33ab50
commit a2b8cfdb8c
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GPG Key ID: 4AEE18F83AFDEB23

@ -2,6 +2,9 @@ use tree_sitter::Node;
use crate::{Rope, Syntax};
const MAX_PLAINTEXT_SCAN: usize = 10000;
// Limit matching pairs to only ( ) { } [ ] < > ' ' " "
const PAIRS: &[(char, char)] = &[
('(', ')'),
('{', '}'),
@ -11,15 +14,15 @@ const PAIRS: &[(char, char)] = &[
('\"', '\"'),
];
// limit matching pairs to only ( ) { } [ ] < > ' ' " "
// Returns the position of the matching bracket under cursor.
//
// If the cursor is one the opening bracket, the position of
// the closing bracket is returned. If the cursor in the closing
// bracket, the position of the opening bracket is returned.
//
// If the cursor is not on a bracket, `None` is returned.
/// Returns the position of the matching bracket under cursor.
///
/// If the cursor is on the opening bracket, the position of
/// the closing bracket is returned. If the cursor on the closing
/// bracket, the position of the opening bracket is returned.
///
/// If the cursor is not on a bracket, `None` is returned.
///
/// If no matching bracket is found, `None` is returned.
#[must_use]
pub fn find_matching_bracket(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> {
if pos >= doc.len_chars() || !is_valid_bracket(doc.char(pos)) {
@ -70,10 +73,77 @@ fn find_pair(syntax: &Syntax, doc: &Rope, pos: usize, traverse_parents: bool) ->
}
}
/// Returns the position of the matching bracket under cursor.
/// This function works on plain text and ignores tree-sitter grammar.
/// The search is limited to `MAX_PLAINTEXT_SCAN` characters
///
/// If the cursor is on the opening bracket, the position of
/// the closing bracket is returned. If the cursor on the closing
/// bracket, the position of the opening bracket is returned.
///
/// If the cursor is not on a bracket, `None` is returned.
///
/// If no matching bracket is found, `None` is returned.
#[must_use]
pub fn find_matching_bracket_current_line_plaintext(
doc: &Rope,
cursor_pos: usize,
) -> Option<usize> {
// Don't do anything when the cursor is not on top of a bracket.
let bracket = doc.char(cursor_pos);
if !is_valid_bracket(bracket) {
return None;
}
// Determine the direction of the matching.
let is_fwd = is_forward_bracket(bracket);
let chars_iter = if is_fwd {
doc.chars_at(cursor_pos + 1)
} else {
doc.chars_at(cursor_pos).reversed()
};
let mut open_cnt = 1;
for (i, candidate) in chars_iter.take(MAX_PLAINTEXT_SCAN).enumerate() {
if candidate == bracket {
open_cnt += 1;
} else if is_valid_pair(
doc,
if is_fwd {
cursor_pos
} else {
cursor_pos - i - 1
},
if is_fwd {
cursor_pos + i + 1
} else {
cursor_pos
},
) {
// Return when all pending brackets have been closed.
if open_cnt == 1 {
return Some(if is_fwd {
cursor_pos + i + 1
} else {
cursor_pos - i - 1
});
}
open_cnt -= 1;
}
}
None
}
fn is_valid_bracket(c: char) -> bool {
PAIRS.iter().any(|(l, r)| *l == c || *r == c)
}
fn is_forward_bracket(c: char) -> bool {
PAIRS.iter().any(|(l, _)| *l == c)
}
fn is_valid_pair(doc: &Rope, start_char: usize, end_char: usize) -> bool {
PAIRS.contains(&(doc.char(start_char), doc.char(end_char)))
}
@ -90,3 +160,36 @@ fn surrounding_bytes(doc: &Rope, node: &Node) -> Option<(usize, usize)> {
Some((start_byte, end_byte))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_find_matching_bracket_current_line_plaintext() {
let assert = |input: &str, pos, expected| {
let input = &Rope::from(input);
let actual = find_matching_bracket_current_line_plaintext(input, pos);
assert_eq!(expected, actual.unwrap());
let actual = find_matching_bracket_current_line_plaintext(input, expected);
assert_eq!(pos, actual.unwrap(), "expected symmetrical behaviour");
};
assert("(hello)", 0, 6);
assert("((hello))", 0, 8);
assert("((hello))", 1, 7);
assert("(((hello)))", 2, 8);
assert("key: ${value}", 6, 12);
assert("key: ${value} # (some comment)", 16, 29);
assert("(paren (paren {bracket}))", 0, 24);
assert("(paren (paren {bracket}))", 7, 23);
assert("(paren (paren {bracket}))", 14, 22);
assert("(prev line\n ) (middle) ( \n next line)", 0, 12);
assert("(prev line\n ) (middle) ( \n next line)", 14, 21);
assert("(prev line\n ) (middle) ( \n next line)", 23, 36);
}
}

@ -4528,21 +4528,24 @@ fn select_prev_sibling(cx: &mut Context) {
fn match_brackets(cx: &mut Context) {
let (view, doc) = current!(cx.editor);
let is_select = cx.editor.mode == Mode::Select;
let text = doc.text();
let text_slice = text.slice(..);
if let Some(syntax) = doc.syntax() {
let text = doc.text().slice(..);
let selection = doc.selection(view.id).clone().transform(|range| {
if let Some(pos) =
match_brackets::find_matching_bracket_fuzzy(syntax, doc.text(), range.cursor(text))
{
range.put_cursor(text, pos, cx.editor.mode == Mode::Select)
let pos = range.cursor(text_slice);
if let Some(matched_pos) = doc.syntax().map_or_else(
|| match_brackets::find_matching_bracket_current_line_plaintext(text, pos),
|syntax| match_brackets::find_matching_bracket_fuzzy(syntax, text, pos),
) {
range.put_cursor(text_slice, matched_pos, is_select)
} else {
range
}
});
doc.set_selection(view.id, selection);
}
}
//

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