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-rw-r--r--helix-core/src/match_brackets.rs34
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
+}