Add usd tree sitter.

Package.swift

@@ -72,7 +72,7 @@ let package = Package(
         .headerSearchPath("TreeSitterRust/include"),
         .headerSearchPath("TreeSitterSwift/include"),
         .headerSearchPath("TreeSitterTOML/include"),
-        // TODO: Create a (.usda) tree sitter.
+        .headerSearchPath("TreeSitterUSD/include"),
       ]
     ),
     .target(

Sources/Editors/Code/CosmoLanguages/CodeLanguage+Definitions.swift

@@ -46,6 +46,7 @@ public extension CodeLanguage
     .rust,
     .swift,
     .toml,
+    .usd,
   ]
 
   /// A language structure for `C`
@@ -124,6 +125,16 @@ public extension CodeLanguage
     rangeCommentStrings: ("", "")
   )
 
+  /// A language structure for `USD`
+  static let usd: CodeLanguage = .init(
+    id: .usd,
+    tsName: "usd",
+    extensions: ["usda"],
+    lineCommentString: "#",
+    rangeCommentStrings: ("", ""),
+    documentationCommentStrings: [.pair(("(", ")"))]
+  )
+
   /// The default language (plain text)
   static let `default`: CodeLanguage = .init(
     id: .plainText,

Sources/Editors/Code/CosmoLanguages/CodeLanguage.swift

@@ -127,6 +127,8 @@ public struct CodeLanguage
         tree_sitter_swift()
       case .toml:
         tree_sitter_toml()
+      case .usd:
+        tree_sitter_usd()
       case .plainText:
         nil
     }

Sources/Editors/Code/CosmoLanguages/Resources/tree-sitter-usd/highlights.scm

@@ -0,0 +1,109 @@
+(None) @constant.builtin
+(asset_path) @text.uri
+(attribute_property) @property
+(bool) @boolean
+(comment) @comment @spell
+(custom) @function.builtin
+(float) @float
+(integer) @number
+(orderer) @function.call
+(prim_path) @string.special
+(relationship_type) @type
+(uniform) @function.builtin
+(variant_set_definition) @keyword
+
+;; Prefer namespace highlighting, if any.
+;;
+;; e.g. `rel fizz` - `fizz` uses `@identifier`
+;; e.g. `rel foo:bar:fizz` - `foo` and `bar` use `@namespace` and `fizz` uses `@identifier`
+;;
+(namespace_identifier) @namespace
+(namespace_identifier
+  (identifier) @namespace
+)
+(identifier) @variable
+
+[
+  "class"
+  "def"
+  "over"
+] @keyword.function
+
+["(" ")" "[" "]" "{" "}"] @punctuation.bracket
+[":" ";" "."] @punctuation.delimiter
+
+[
+  "="
+] @operator
+
+(attribute_type) @type
+(
+ ;; Reference: https://openusd.org/release/api/sdf_page_front.html
+ (attribute_type) @type.builtin
+ (#any-of? @type.builtin
+  ;; Scalar types
+  "asset" "asset[]"
+  "bool" "bool[]"
+  "double" "double[]"
+  "float" "float[]"
+  "half" "half[]"
+  "int" "int[]"
+  "int64" "int64[]"
+  "string" "string[]"
+  "timecode" "timecode[]"
+  "token" "token[]"
+  "uchar" "uchar[]"
+  "uint" "uint[]"
+  "uint64" "uint64[]"
+
+  ;; Dimensioned Types
+  "double2" "double2[]"
+  "double3" "double3[]"
+  "double4" "double4[]"
+  "float2" "float2[]"
+  "float3" "float3[]"
+  "float4" "float4[]"
+  "half2" "half2[]"
+  "half3" "half3[]"
+  "half4" "half4[]"
+  "int2" "int2[]"
+  "int3" "int3[]"
+  "int4" "int4[]"
+  "matrix2d" "matrix2d[]"
+  "matrix3d" "matrix3d[]"
+  "matrix4d" "matrix4d[]"
+  "quatd" "quatd[]"
+  "quatf" "quatf[]"
+  "quath" "quath[]"
+
+  ;; Extra Types
+  "color3f" "color3f[]"
+  "normal3f" "normal3f[]"
+  "point3f" "point3f[]"
+  "texCoord2f" "texCoord2f[]"
+  "vector3d" "vector3d[]"
+  "vector3f" "vector3f[]"
+  "vector3h" "vector3h[]"
+
+  "dictionary"
+
+  ;; Deprecated Types
+  "EdgeIndex" "EdgeIndex[]"
+  "FaceIndex" "FaceIndex[]"
+  "Matrix4d" "Matrix4d[]"
+  "PointIndex" "PointIndex[]"
+  "PointFloat" "PointFloat[]"
+  "Transform" "Transform[]"
+  "Vec3f" "Vec3f[]"
+ )
+)
+
+; In USD def "foo" ("This is a docstring") {} < the ""s within the ()s is not
+; a string but a docstring
+;
+(metadata
+ (comment)*
+ .
+ (string) @comment.documentation)
+
+(string) @string

Sources/Editors/Code/CosmoLanguages/TreeSitterLanguage.swift

@@ -36,5 +36,6 @@ public enum TreeSitterLanguage: String
   case rust
   case swift
   case toml
+  case usd
   case plainText
 }

Sources/Editors/Code/CosmoLanguages/TreeSitterModel.swift

@@ -55,6 +55,8 @@ public class TreeSitterModel
         swiftQuery
       case .toml:
         tomlQuery
+      case .usd:
+        usdQuery
       case .plainText:
         nil
     }
@@ -81,6 +83,9 @@ public class TreeSitterModel
   /// Query for `TOML` files.
   public private(set) lazy var tomlQuery: Query? = queryFor(.toml)
 
+  /// Query for `USD` files.
+  public private(set) lazy var usdQuery: Query? = queryFor(.usd)
+
   private func queryFor(_ codeLanguage: CodeLanguage) -> Query?
   {
     // get the tree-sitter language and query url if available