Add textobjects queries (#20924)

Co-Authored-By: Max <max@zed.dev>

Release Notes:

- vim: Added motions `[[`, `[]`, `]]`, `][` for navigating by section,
`[m`, `]m`, `[M`, `]M` for navigating by method, and `[*`, `]*`, `[/`,
`]/` for comments. These currently only work for languages built in to
Zed, as they are powered by new tree-sitter queries.
- vim: Added new text objects: `ic`, `ac` for inside/around classes,
`if`,`af` for functions/methods, and `g c` for comments. These currently
only work for languages built in to Zed, as they are powered by new
tree-sitter queries.

---------

Co-authored-by: Max <max@zed.dev>

crates/language/src/buffer_tests.rs

@@ -20,6 +20,7 @@ use std::{
     sync::LazyLock,
     time::{Duration, Instant},
 };
+use syntax_map::TreeSitterOptions;
 use text::network::Network;
 use text::{BufferId, LineEnding, LineIndent};
 use text::{Point, ToPoint};
@@ -915,6 +916,39 @@ async fn test_symbols_containing(cx: &mut gpui::TestAppContext) {
     }
 }
 
+#[gpui::test]
+fn test_text_objects(cx: &mut AppContext) {
+    let (text, ranges) = marked_text_ranges(
+        indoc! {r#"
+            impl Hello {
+                fn say() -> u8 { return /* ˇhi */ 1 }
+            }"#
+        },
+        false,
+    );
+
+    let buffer =
+        cx.new_model(|cx| Buffer::local(text.clone(), cx).with_language(Arc::new(rust_lang()), cx));
+    let snapshot = buffer.update(cx, |buffer, _| buffer.snapshot());
+
+    let matches = snapshot
+        .text_object_ranges(ranges[0].clone(), TreeSitterOptions::default())
+        .map(|(range, text_object)| (&text[range], text_object))
+        .collect::<Vec<_>>();
+
+    assert_eq!(
+        matches,
+        &[
+            ("/* hi */", TextObject::AroundComment),
+            ("return /* hi */ 1", TextObject::InsideFunction),
+            (
+                "fn say() -> u8 { return /* hi */ 1 }",
+                TextObject::AroundFunction
+            ),
+        ],
+    )
+}
+
 #[gpui::test]
 fn test_enclosing_bracket_ranges(cx: &mut AppContext) {
     let mut assert = |selection_text, range_markers| {
@@ -3182,6 +3216,20 @@ fn rust_lang() -> Language {
         "#,
     )
     .unwrap()
+    .with_text_object_query(
+        r#"
+        (function_item
+            body: (_
+                "{"
+                (_)* @function.inside
+                "}" )) @function.around
+
+        (line_comment)+ @comment.around
+
+        (block_comment) @comment.around
+        "#,
+    )
+    .unwrap()
     .with_outline_query(
         r#"
         (line_comment) @annotation