diff options
Diffstat (limited to 'helix-core/src/match_brackets.rs')
-rw-r--r-- | helix-core/src/match_brackets.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/helix-core/src/match_brackets.rs b/helix-core/src/match_brackets.rs new file mode 100644 index 00000000..bacd764f --- /dev/null +++ b/helix-core/src/match_brackets.rs @@ -0,0 +1,34 @@ +use crate::{Range, Rope, Selection, Syntax}; + +// const PAIRS: &[(char, char)] = &[('(', ')'), ('{', '}'), ('[', ']')]; +// limit matching pairs to only ( ) { } [ ] < > + +pub fn find(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> { + let tree = syntax.root_layer.tree.as_ref().unwrap(); + + let byte_pos = doc.char_to_byte(pos); + + // most naive implementation: find the innermost syntax node, if we're at the edge of a node, + // return the other edge. + + let mut node = match tree + .root_node() + .named_descendant_for_byte_range(byte_pos, byte_pos) + { + Some(node) => node, + None => return None, + }; + + let start_byte = node.start_byte(); + let end_byte = node.end_byte() - 1; // it's end exclusive + + if start_byte == byte_pos { + return Some(doc.byte_to_char(end_byte)); + } + + if end_byte == byte_pos { + return Some(doc.byte_to_char(start_byte)); + } + + None +} |