Highlighting improvements.

queries/highlights.scm

@@ -11,7 +11,47 @@
 (marker_annotation
   name: (identifier) @attribute)
 
-"@" @operator
+; Operators and Tokens
+
+(template_substitution
+  "${" @punctuation.special
+  "}" @punctuation.special) @embedded
+
+[
+  ";"
+  "."
+  ","
+] @punctuation.delimiter
+
+[
+  "--"
+  "-"
+  "-="
+  "&&"
+  "+"
+  "++"
+  "+="
+  "<"
+  "<<"
+  "="
+  "=="
+  "==="
+  "=>"
+  ">"
+  ">>"
+  "||"
+  "@"
+] @operator
+
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+]  @punctuation.bracket
+
 
 ; Types
 
@@ -42,15 +82,23 @@
 ((identifier) @constant
  (#match? @constant "^_*[A-Z][A-Z\d_]+"))
 
+(identifier) @variable
+
 (this) @variable.builtin
 
 ; Literals
 
-(hex_integer_literal) @number
-(decimal_integer_literal) @number
-(octal_integer_literal) @number
-(decimal_floating_point_literal) @number
-(hex_floating_point_literal) @number
+[
+    (hex_integer_literal)
+    (decimal_integer_literal)
+    (octal_integer_literal)
+    (decimal_floating_point_literal)
+    (hex_floating_point_literal)
+
+] @number
+
+(symbol_literal) @string.special.symbol
+
 (string_literal) @string
 (true) @constant.builtin
 (false) @constant.builtin
@@ -60,35 +108,105 @@
 
 ; Keywords
 
-"abstract" @keyword
-"assert" @keyword
-"break" @keyword
-"case" @keyword
-"catch" @keyword
-"on" @keyword
-"class" @keyword
-"continue" @keyword
-"default" @keyword
-"do" @keyword
-"else" @keyword
-"enum" @keyword
-"export" @keyword
-"extends" @keyword
-"final" @keyword
-"finally" @keyword
-"for" @keyword
-"if" @keyword
-"implements" @keyword
-"import" @keyword
-"is" @keyword
-"as" @keyword
-"mixin" @keyword
-"external" @keyword
-"new" @keyword
-"return" @keyword
-"static" @keyword
-"switch" @keyword
-"throw" @keyword
-; "rethrow" @keyword
-"try" @keyword
-"while" @keyword
+;; "abstract" @keyword
+;; "assert" @keyword
+;; "break" @keyword
+;; "case" @keyword
+;; "catch" @keyword
+;; "on" @keyword
+;; "class" @keyword
+;; "continue" @keyword
+;; "default" @keyword
+;; "do" @keyword
+;; "else" @keyword
+;; "enum" @keyword
+;; "export" @keyword
+;; "extends" @keyword
+;; "final" @keyword
+;; "finally" @keyword
+;; "for" @keyword
+;; "if" @keyword
+;; "implements" @keyword
+;; "import" @keyword
+;; "is" @keyword
+;; "as" @keyword
+;; "mixin" @keyword
+;; "external" @keyword
+;; "new" @keyword
+;; "return" @keyword
+;; "static" @keyword
+;; "switch" @keyword
+;; "throw" @keyword
+;; ; "rethrow" @keyword
+;; "try" @keyword
+;; "while" @keyword
+
+; Reserved words (cannot be used as identifiers)
+ [
+        "assert"
+        "break"
+        "case"
+        "catch"
+        "class"
+        "const"
+        "continue"
+        "default"
+        "do"
+        "else"
+        "enum"
+        "extends"
+  ;      "false"
+        "final"
+        "finally"
+        "for"
+        "if"
+        "in"
+        "is"
+        "new"
+  ;      "null"
+        "rethrow"
+        "return"
+        "super"
+        "switch"
+  ;      "this"
+        "throw"
+  ;      "true"
+        "try"
+        "var"
+        "void"
+        "while"
+        "with"
+  ] @keyword
+
+; Built in identifiers:
+
+;; alone:
+
+[
+    "abstract"
+    "as"
+    "covariant"
+    "deferred"
+    "dynamic"
+    "export"
+    "external"
+    "factory"
+    "Function"
+    "get"
+    "implements"
+    "import"
+    "interface"
+    "library"
+    "operator"
+    "mixin"
+    "part"
+    "set"
+    "static"
+    "typedef"
+] @keyword
+
+;; when used as an identifier:
+
+((identifier) @variable.builtin
+ (#match? @variable.builtin "^(abstract|as|covariant|deferred|dynamic|export|external|factory|Function|get|implements|import|interface|library|operator|mixin|part|set|static|typedef)$")
+ (#is-not? local))