add partial scala syntax highlights

languages.toml

@@ -430,3 +430,12 @@ file-types = ["md"]
 roots = []
 
 indent = { tab-width = 2, unit = "  " }
+
+[[language]]
+name = "scala"
+scope = "source.scala"
+roots = ["build.sbt"]
+file-types = ["scala", "sbt"]
+comment-token = "//"
+indent = { tab-width = 2, unit = "  " }
+language-server = { command = "metals" }

runtime/queries/scala/highlights.scm

@@ -0,0 +1,204 @@
+; CREDITS @stumash (stuart.mashaal@gmail.com)
+
+;; variables
+
+(identifier) @variable
+
+((identifier) @variable.builtin
+ (#match? @variable.builtin "^this$"))
+
+(interpolation) @none
+
+; Assume other uppercase names constants.
+; NOTE: In order to distinguish constants we highlight
+; all the identifiers that are uppercased. But this solution
+; is not suitable for all occurrences e.g. it will highlight
+; an uppercased method as a constant if used with no params.
+; Introducing highlighting for those specific cases, is probably
+; best way to resolve the issue.
+((identifier) @constant (#match? @constant "^[A-Z]"))
+
+;; types
+
+(type_identifier) @type
+
+(class_definition
+  name: (identifier) @type)
+
+(object_definition
+  name: (identifier) @type)
+
+(trait_definition
+  name: (identifier) @type)
+
+(type_definition
+  name: (type_identifier) @type)
+
+; method definition
+
+(class_definition
+  body: (template_body
+    (function_definition
+      name: (identifier) @method)))
+(object_definition
+  body: (template_body
+    (function_definition
+      name: (identifier) @method)))
+(trait_definition
+  body: (template_body
+    (function_definition
+      name: (identifier) @method)))
+
+; imports
+
+(import_declaration
+  path: (identifier) @namespace)
+((stable_identifier (identifier) @namespace))
+
+((import_declaration
+  path: (identifier) @type) (#match? @type "^[A-Z]"))
+((stable_identifier (identifier) @type) (#match? @type "^[A-Z]"))
+
+((import_selectors (identifier) @type) (#match? @type "^[A-Z]"))
+
+; method invocation
+
+
+(call_expression
+  function: (identifier) @function)
+
+(call_expression
+  function: (field_expression
+    field: (identifier) @method))
+
+((call_expression
+   function: (identifier) @constructor)
+ (#match? @constructor "^[A-Z]"))
+
+(generic_function
+  function: (identifier) @function)
+
+(
+  (identifier) @function.builtin
+  (#match? @function.builtin "^super$")
+)
+
+; function definitions
+
+(function_definition
+  name: (identifier) @function)
+
+(parameter
+  name: (identifier) @parameter)
+
+; expressions
+
+
+(field_expression field: (identifier) @property)
+(field_expression value: (identifier) @type
+ (#match? @type "^[A-Z]"))
+
+(infix_expression operator: (identifier) @operator)
+(infix_expression operator: (operator_identifier) @operator)
+(infix_type operator: (operator_identifier) @operator)
+(infix_type operator: (operator_identifier) @operator)
+
+; literals
+
+(boolean_literal) @constant.builtin.boolean
+; (integer_literal) @constant.numeric.integer
+; (floating_point_literal) @constant.builtin.boolean
+
+[
+(symbol_literal)
+(string)
+(character_literal)
+(interpolated_string_expression)
+] @string
+
+(interpolation "$" @punctuation.special)
+
+;; keywords
+
+[
+  "abstract"
+  "case"
+  "class"
+  "extends"
+  "final"
+  "finally"
+;; `forSome` existential types not implemented yet
+  "implicit"
+  "lazy"
+;; `macro` not implemented yet
+  "object"
+  "override"
+  "package"
+  "private"
+  "protected"
+  "sealed"
+  "trait"
+  "type"
+  "val"
+  "var"
+  "with"
+] @keyword
+
+; (null_literal) @keyword
+(wildcard) @keyword
+
+;; special keywords
+
+"new" @keyword.operator
+
+[
+  "else"
+  "if"
+  "match"
+] @conditional
+
+[
+ "("
+ ")"
+ "["
+ "]"
+ "{"
+ "}"
+]  @punctuation.bracket
+
+[
+ "."
+ ","
+] @punctuation.delimiter
+
+; [
+ ; "do"
+ ; "for"
+ ; "while"
+ ; "yield"
+; ] @repeat
+
+"def" @keyword.function
+
+;[
+; "=>"
+; "<-"
+; "@"
+;] @operator
+
+"import" @include
+
+;[
+;  "try"
+;  "catch"
+;  "throw"
+;] @exception
+
+;"return" @keyword.return
+
+(comment) @comment
+
+;; `case` is a conditional keyword in case_block
+
+(case_block
+  (case_clause ("case") @conditional))

runtime/queries/scala/injections.scm

@@ -0,0 +1 @@
+(comment) @comment