51 lines
1.6 KiB
Rust
51 lines
1.6 KiB
Rust
use galaxyui::text::TextBuffer;
|
|
use itertools::Itertools;
|
|
use string_offset::CharOffset;
|
|
|
|
use crate::vim::{BracketChar, BracketEnd};
|
|
|
|
/// This method looks for the bracket that complements/pairs with the passed in BracketChar,
|
|
/// starting the search at the passed in offset.
|
|
pub fn vim_find_matching_bracket<'a, T, C>(
|
|
buffer: &'a T,
|
|
bracket_char: &BracketChar,
|
|
offset: C,
|
|
) -> Option<CharOffset>
|
|
where
|
|
T: TextBuffer + ?Sized + 'a,
|
|
C: Into<CharOffset>,
|
|
{
|
|
let offset = offset.into();
|
|
|
|
// If we're matching for an opening bracket, search forward, and vice versa.
|
|
let mut iter: Box<dyn Iterator<Item = char>> = match bracket_char.end {
|
|
BracketEnd::Opening => Box::new(buffer.chars_at(offset + 1).ok()?),
|
|
BracketEnd::Closing => Box::new(buffer.chars_rev_at(offset).ok()?),
|
|
};
|
|
|
|
// If we encounter more instances of the same bracket, i.e. we're matching "(" and we pass by
|
|
// another "(", we must first match each additional "(" we encounter. Keep a count of those in
|
|
// this "depth" variable.
|
|
let mut depth: u32 = 0;
|
|
let (i, _) = iter.find_position(|c| {
|
|
if bracket_char.is_char(*c) {
|
|
depth += 1;
|
|
} else if bracket_char.complements(*c) {
|
|
if depth == 0 {
|
|
return true;
|
|
} else {
|
|
depth -= 1;
|
|
}
|
|
}
|
|
false
|
|
})?;
|
|
match bracket_char.end {
|
|
BracketEnd::Opening => Some(offset + i + 1),
|
|
BracketEnd::Closing => Some(offset - i - 1),
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
#[path = "matching_brackets_tests.rs"]
|
|
mod tests;
|