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.rs38
1 files changed, 38 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..aa59b2f2
--- /dev/null
+++ b/helix-syntax/src/tree_sitter/ropey.rs
@@ -0,0 +1,38 @@
+use regex_cursor::{Cursor, RopeyCursor};
+use ropey::RopeSlice;
+
+use crate::tree_sitter::parser::{IntoParserInput, ParserInput};
+
+pub struct RopeParserInput<'a> {
+ src: RopeSlice<'a>,
+ cursor: regex_cursor::RopeyCursor<'a>,
+}
+
+impl<'a> IntoParserInput for RopeSlice<'a> {
+ type ParserInput = RopeParserInput<'a>;
+
+ fn into_parser_input(self) -> Self::ParserInput {
+ RopeParserInput {
+ src: self,
+ cursor: RopeyCursor::new(self),
+ }
+ }
+}
+
+impl ParserInput for RopeParserInput<'_> {
+ fn read(&mut self, offset: usize) -> &[u8] {
+ // 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 restarting 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() {
+ return &[];
+ }
+ }
+ }
+ self.cursor.chunk()
+ }
+}