bendns' repos / helix
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'helix-syntax/src/tree_sitter/ropey.rs')
-rw-r--r--helix-syntax/src/tree_sitter/ropey.rs54
1 files changed, 54 insertions, 0 deletions
diff --git a/helix-syntax/src/tree_sitter/ropey.rs b/helix-syntax/src/tree_sitter/ropey.rs
new file mode 100644
index 00000000..3e2354da
--- /dev/null
+++ b/helix-syntax/src/tree_sitter/ropey.rs
@@ -0,0 +1,54 @@
+use std::ops;
+
+use regex_cursor::{Cursor, RopeyCursor};
+use ropey::RopeSlice;
+
+use crate::tree_sitter::{IntoTsInput, TsInput};
+
+pub struct RopeTsInput<'a> {
+ src: RopeSlice<'a>,
+ cursor: regex_cursor::RopeyCursor<'a>,
+}
+
+impl<'a> RopeTsInput<'a> {
+ pub fn new(src: RopeSlice<'a>) -> Self {
+ RopeTsInput {
+ src,
+ cursor: regex_cursor::RopeyCursor::new(src),
+ }
+ }
+}
+
+impl<'a> IntoTsInput for RopeSlice<'a> {
+ type TsInput = RopeTsInput<'a>;
+
+ fn into_ts_input(self) -> Self::TsInput {
+ RopeTsInput {
+ src: self,
+ cursor: RopeyCursor::new(self),
+ }
+ }
+}
+
+impl<'a> TsInput for RopeTsInput<'a> {
+ type Cursor = RopeyCursor<'a>;
+ fn cursor_at(&mut self, offset: usize) -> &mut RopeyCursor<'a> {
+ // this cursor is optimized for contigous reads which are by far the most common during parsing
+ // very far jumps (like injections at the other end of the document) are handelde
+ // by starting a new cursor (new chunks iterator)
+ if offset < self.cursor.offset() || self.cursor.offset() - offset > 4906 {
+ self.cursor = regex_cursor::RopeyCursor::at(self.src, offset);
+ } else {
+ while self.cursor.offset() + self.cursor.chunk().len() >= offset {
+ if !self.cursor.advance() {
+ break;
+ }
+ }
+ }
+ &mut self.cursor
+ }
+
+ fn eq(&mut self, range1: ops::Range<usize>, range2: ops::Range<usize>) -> bool {
+ self.src.byte_slice(range1) == self.src.byte_slice(range2)
+ }
+}