feat(data_structures): add rope

crates/oxc_data_structures/Cargo.toml

@@ -22,3 +22,4 @@ doctest = false
 
 [dependencies]
 assert-unchecked = { workspace = true }
+ropey = { workspace = true }

crates/oxc_data_structures/src/lib.rs

@@ -1,3 +1,4 @@
 //! Data structures used across other oxc crates.
 #![warn(missing_docs)]
+pub mod rope;
 pub mod stack;

crates/oxc_transformer/src/jsx/utils.rs → crates/oxc_data_structures/src/rope.rs

@@ -1,96 +1,93 @@
-use ropey::Rope;
-
-/// Get line and column from offset and source text.
-///
-/// Line number starts at 1.
-/// Column number is in UTF-16 characters, and starts at 1.
-///
-/// This matches Babel's output.
-pub fn get_line_column(rope: &Rope, offset: u32, source_text: &str) -> (usize, usize) {
+//! Rope
+
+pub use ropey::Rope;
+
+/// Get UTF16 line and column from UTF8 offset and source text.
+#[expect(clippy::cast_possible_truncation)]
+pub fn get_line_column(rope: &Rope, offset: u32, source_text: &str) -> (u32, u32) {
     let offset = offset as usize;
     // Get line number and byte offset of start of line
     let line_index = rope.byte_to_line(offset);
     let line_offset = rope.line_to_byte(line_index);
     // Get column number
     let column_index = source_text[line_offset..offset].encode_utf16().count();
-    // line and column are zero-indexed, but we want 1-indexed
-    (line_index + 1, column_index + 1)
+    (line_index as u32, column_index as u32)
 }
 
 #[cfg(test)]
 mod test {
     use ropey::Rope;
 
-    fn test_line_column(offset: u32, source_text: &str) -> (usize, usize) {
+    fn test_line_column(offset: u32, source_text: &str) -> (u32, u32) {
         let rope = Rope::from_str(source_text);
         super::get_line_column(&rope, offset, source_text)
     }
 
     #[test]
     fn empty_file() {
-        assert_eq!(test_line_column(0, ""), (1, 1));
+        assert_eq!(test_line_column(0, ""), (0, 0));
     }
 
     #[test]
     fn first_line_start() {
-        assert_eq!(test_line_column(0, "foo\nbar\n"), (1, 1));
+        assert_eq!(test_line_column(0, "foo\nbar\n"), (0, 0));
     }
 
     #[test]
     fn first_line_middle() {
-        assert_eq!(test_line_column(5, "blahblahblah\noops\n"), (1, 6));
+        assert_eq!(test_line_column(5, "blahblahblah\noops\n"), (0, 5));
     }
 
     #[test]
     fn later_line_start() {
-        assert_eq!(test_line_column(8, "foo\nbar\nblahblahblah"), (3, 1));
+        assert_eq!(test_line_column(8, "foo\nbar\nblahblahblah"), (2, 0));
     }
 
     #[test]
     fn later_line_middle() {
-        assert_eq!(test_line_column(12, "foo\nbar\nblahblahblah"), (3, 5));
+        assert_eq!(test_line_column(12, "foo\nbar\nblahblahblah"), (2, 4));
     }
 
     #[test]
     fn after_2_byte_unicode() {
         assert_eq!("£".len(), 2);
         assert_eq!(utf16_len("£"), 1);
-        assert_eq!(test_line_column(4, "£abc"), (1, 4));
+        assert_eq!(test_line_column(4, "£abc"), (0, 3));
     }
 
     #[test]
     fn after_3_byte_unicode() {
         assert_eq!("अ".len(), 3);
         assert_eq!(utf16_len("अ"), 1);
-        assert_eq!(test_line_column(5, "अabc"), (1, 4));
+        assert_eq!(test_line_column(5, "अabc"), (0, 3));
     }
 
     #[test]
     fn after_4_byte_unicode() {
         assert_eq!("🍄".len(), 4);
         assert_eq!(utf16_len("🍄"), 2);
-        assert_eq!(test_line_column(6, "🍄abc"), (1, 5));
+        assert_eq!(test_line_column(6, "🍄abc"), (0, 4));
     }
 
     #[test]
     fn after_2_byte_unicode_on_previous_line() {
         assert_eq!("£".len(), 2);
         assert_eq!(utf16_len("£"), 1);
-        assert_eq!(test_line_column(4, "£\nabc"), (2, 2));
+        assert_eq!(test_line_column(4, "£\nabc"), (1, 1));
     }
 
     #[test]
     fn after_3_byte_unicode_on_previous_line() {
         assert_eq!("अ".len(), 3);
         assert_eq!(utf16_len("अ"), 1);
-        assert_eq!(test_line_column(5, "अ\nabc"), (2, 2));
+        assert_eq!(test_line_column(5, "अ\nabc"), (1, 1));
     }
 
     #[test]
     fn after_4_byte_unicode_on_previous_line() {
         assert_eq!("🍄".len(), 4);
         assert_eq!(utf16_len("🍄"), 2);
-        assert_eq!(test_line_column(6, "🍄\nabc"), (2, 2));
+        assert_eq!(test_line_column(6, "🍄\nabc"), (1, 1));
     }
 
     #[cfg(test)]

crates/oxc_language_server/Cargo.toml

@@ -23,6 +23,7 @@ doctest = false
 
 [dependencies]
 oxc_allocator = { workspace = true }
+oxc_data_structures = { workspace = true }
 oxc_diagnostics = { workspace = true }
 oxc_linter = { workspace = true }
 oxc_parser = { workspace = true }
@@ -36,7 +37,6 @@ futures = { workspace = true }
 globset = { workspace = true }
 ignore = { workspace = true, features = ["simd-accel"] }
 log = { workspace = true }
-ropey = { workspace = true }
 rustc-hash = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }

crates/oxc_language_server/src/linter.rs

@@ -1,5 +1,3 @@
-use cow_utils::CowUtils;
-use oxc_linter::loader::LINT_PARTIAL_LOADER_EXT;
 use std::{
     fs,
     path::{Path, PathBuf},
@@ -8,22 +6,25 @@ use std::{
     sync::{Arc, OnceLock},
 };
 
+use cow_utils::CowUtils;
 use log::debug;
+use rustc_hash::FxHashSet;
+use tower_lsp::lsp_types::{
+    self, CodeDescription, DiagnosticRelatedInformation, DiagnosticSeverity, NumberOrString,
+    Position, Range, Url,
+};
+
 use oxc_allocator::Allocator;
+use oxc_data_structures::rope::{get_line_column, Rope};
 use oxc_diagnostics::{Error, NamedSource, Severity};
+use oxc_linter::loader::LINT_PARTIAL_LOADER_EXT;
 use oxc_linter::{
     loader::{JavaScriptSource, Loader},
     FixKind, Linter, ModuleRecord,
 };
 use oxc_parser::{ParseOptions, Parser};
 use oxc_semantic::SemanticBuilder;
 use oxc_span::VALID_EXTENSIONS;
-use ropey::Rope;
-use rustc_hash::FxHashSet;
-use tower_lsp::lsp_types::{
-    self, CodeDescription, DiagnosticRelatedInformation, DiagnosticSeverity, NumberOrString,
-    Position, Range, Url,
-};
 
 const LINT_DOC_LINK_PREFIX: &str = "https://oxc.rs/docs/guide/usage/linter/rules";
 #[derive(Debug)]
@@ -53,13 +54,11 @@ impl ErrorWithPosition {
         let labels_with_pos: Vec<LabeledSpanWithPosition> = labels
             .iter()
             .map(|labeled_span| LabeledSpanWithPosition {
-                start_pos: offset_to_position(labeled_span.offset() + start, text)
-                    .unwrap_or_default(),
+                start_pos: offset_to_position(labeled_span.offset() + start, text),
                 end_pos: offset_to_position(
                     labeled_span.offset() + start + labeled_span.len(),
                     text,
-                )
-                .unwrap_or_default(),
+                ),
                 message: labeled_span.label().map(ToString::to_string),
             })
             .collect();
@@ -304,13 +303,11 @@ impl IsolatedLintHandler {
                             start: offset_to_position(
                                 (f.span.start + start) as usize,
                                 source_text.as_str(),
-                            )
-                            .unwrap_or_default(),
+                            ),
                             end: offset_to_position(
                                 (f.span.end + start) as usize,
                                 source_text.as_str(),
-                            )
-                            .unwrap_or_default(),
+                            ),
                         },
                     });
 
@@ -359,16 +356,11 @@ impl IsolatedLintHandler {
 }
 
 #[allow(clippy::cast_possible_truncation)]
-fn offset_to_position(offset: usize, source_text: &str) -> Option<Position> {
+fn offset_to_position(offset: usize, source_text: &str) -> Position {
+    // TODO(perf): share a single instance of `Rope`
     let rope = Rope::from_str(source_text);
-    // Get line number and byte offset of start of line
-    let line_index = rope.try_byte_to_line(offset).ok()?;
-    let line_offset = rope.try_line_to_byte(line_index).ok()?;
-
-    // Get column number
-    let column_index = source_text[line_offset..offset].encode_utf16().count();
-
-    Some(Position::new(line_index as u32, column_index as u32))
+    let (line, column) = get_line_column(&rope, offset as u32, source_text);
+    Position::new(line, column)
 }
 
 pub struct ServerLinter {

crates/oxc_transformer/Cargo.toml

@@ -41,7 +41,6 @@ dashmap = { workspace = true }
 indexmap = { workspace = true }
 itoa = { workspace = true }
 lazy_static = { workspace = true }
-ropey = { workspace = true }
 rustc-hash = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }

crates/oxc_transformer/src/jsx/jsx_source.rs

@@ -33,7 +33,7 @@
 //!
 //! * Babel plugin implementation: <https://github.com/babel/babel/blob/v7.26.2/packages/babel-plugin-transform-react-jsx-source/src/index.ts>
 
-use ropey::Rope;
+use oxc_data_structures::rope::{get_line_column, Rope};
 
 use oxc_ast::ast::*;
 use oxc_diagnostics::OxcDiagnostic;
@@ -43,8 +43,6 @@ use oxc_traverse::{BoundIdentifier, Traverse, TraverseCtx};
 
 use crate::TransformCtx;
 
-use super::utils::get_line_column;
-
 const SOURCE: &str = "__source";
 const FILE_NAME_VAR: &str = "jsxFileName";
 
@@ -77,16 +75,24 @@ impl<'a, 'ctx> Traverse<'a> for JsxSource<'a, 'ctx> {
 }
 
 impl<'a, 'ctx> JsxSource<'a, 'ctx> {
-    pub fn get_line_column(&mut self, offset: u32) -> (usize, usize) {
+    /// Get line and column from offset and source text.
+    ///
+    /// Line number starts at 1.
+    /// Column number is in UTF-16 characters, and starts at 1.
+    ///
+    /// This matches Babel's output.
+    pub fn get_line_column(&mut self, offset: u32) -> (u32, u32) {
         let source_rope =
             self.source_rope.get_or_insert_with(|| Rope::from_str(self.ctx.source_text));
-        get_line_column(source_rope, offset, self.ctx.source_text)
+        let (line, column) = get_line_column(source_rope, offset, self.ctx.source_text);
+        // line and column are zero-indexed, but we want 1-indexed
+        (line + 1, column + 1)
     }
 
     pub fn get_object_property_kind_for_jsx_plugin(
         &mut self,
-        line: usize,
-        column: usize,
+        line: u32,
+        column: u32,
         ctx: &mut TraverseCtx<'a>,
     ) -> ObjectPropertyKind<'a> {
         let kind = PropertyKind::Init;
@@ -136,11 +142,11 @@ impl<'a, 'ctx> JsxSource<'a, 'ctx> {
         elem.attributes.push(attribute_item);
     }
 
-    #[allow(clippy::cast_precision_loss)]
+    #[expect(clippy::cast_lossless)]
     pub fn get_source_object(
         &mut self,
-        line: usize,
-        column: usize,
+        line: u32,
+        column: u32,
         ctx: &mut TraverseCtx<'a>,
     ) -> Expression<'a> {
         let kind = PropertyKind::Init;

crates/oxc_transformer/src/jsx/mod.rs

@@ -11,7 +11,6 @@ mod jsx_self;
 mod jsx_source;
 mod options;
 mod refresh;
-mod utils;
 use refresh::ReactRefresh;
 
 pub use display_name::ReactDisplayName;