1e793c2bbf
This enables `mm` to work on quote characters as well as highlighting of matching quote when on it.
55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
use crate::{Rope, Syntax};
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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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// limit matching pairs to only ( ) { } [ ] < >
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#[must_use]
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pub fn find(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> {
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let tree = syntax.tree();
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let byte_pos = doc.char_to_byte(pos);
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// most naive implementation: find the innermost syntax node, if we're at the edge of a node,
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// return the other edge.
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let node = match tree
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.root_node()
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.named_descendant_for_byte_range(byte_pos, byte_pos)
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{
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Some(node) => node,
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None => return None,
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};
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if node.is_error() {
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return None;
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}
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let len = doc.len_bytes();
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let start_byte = node.start_byte();
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let end_byte = node.end_byte().saturating_sub(1); // it's end exclusive
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if start_byte >= len || end_byte >= len {
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return None;
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}
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let start_char = doc.byte_to_char(start_byte);
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let end_char = doc.byte_to_char(end_byte);
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if PAIRS.contains(&(doc.char(start_char), doc.char(end_char))) {
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if start_byte == byte_pos {
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return Some(end_char);
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}
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if end_byte == byte_pos {
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return Some(start_char);
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}
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}
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None
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}
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