Add APIs for retrieving tree cursor's depth and descendant index

lib/binding_rust/bindings.rs

@@ -615,7 +615,12 @@ extern "C" {
 extern "C" {
     #[doc = " Get the index of the cursor's current node out of all of the"]
     #[doc = " descendants of the original node that the cursor was constructed with."]
-    pub fn ts_tree_cursor_descendant_index(arg1: *mut TSTreeCursor) -> u32;
+    pub fn ts_tree_cursor_current_descendant_index(arg1: *const TSTreeCursor) -> u32;
+}
+extern "C" {
+    #[doc = " Get the depth of the cursor's current node relative to the original"]
+    #[doc = " node that the cursor was constructed with."]
+    pub fn ts_tree_cursor_current_depth(arg1: *const TSTreeCursor) -> u32;
 }
 extern "C" {
     #[doc = " Move the cursor to the first child of its current node that extends beyond"]

lib/binding_rust/lib.rs

@@ -1266,6 +1266,21 @@ impl<'a> TreeCursor<'a> {
         }
     }
 
+    /// Get the numerical field id of this tree cursor's current node.
+    ///
+    /// See also [field_name](TreeCursor::field_name).
+    #[doc(alias = "ts_tree_cursor_current_depth")]
+    pub fn depth(&self) -> u32 {
+        unsafe { ffi::ts_tree_cursor_current_depth(&self.0) }
+    }
+
+    /// Get the index of the cursor's current node out of all of the
+    /// descendants of the original node that the cursor was constructed with
+    #[doc(alias = "ts_tree_cursor_current_descendant_index")]
+    pub fn descendant_index(&self) -> usize {
+        unsafe { ffi::ts_tree_cursor_current_descendant_index(&self.0) as usize }
+    }
+
     /// Move this cursor to the first child of its current node.
     ///
     /// This returns `true` if the cursor successfully moved, and returns `false`