highlights(hack): add keywords implements

queries/hack/highlights.scm

@@ -21,6 +21,7 @@
  "await"
  "type"
  "interface"
+ "implements"
  "class"
  "protected"
  "private"
@@ -32,7 +33,7 @@
  (xhp_modifier)
  (final_modifier)
  "extends"
-  "insteadof"
+ "insteadof"
 ] @keyword
 
 "use" @include
@@ -61,12 +62,20 @@
   "arraykey"
   "void"
   "nonnull"
-  (null)
   "mixed"
   "dynamic"
   "noreturn"
 ] @type.builtin
 
+[
+  (null)
+] @constant.builtin
+
+[
+  (true)
+  (false)
+] @boolean
+
 (type_specifier) @type
 (new_expression
   (_) @type)
@@ -83,7 +92,6 @@
   (qualified_identifier
     (identifier) @type .))
 
-(function_type_specifier) @function
 (attribute_modifier) @attribute
 [
  "@required"

tests/query/highlights/hack/attribute-type.hack

@@ -9,7 +9,7 @@ newtype T1 = ?shape(
 //       ^ attribute
 type T2 = (function(T1): string);
 //    ^ type
-//          ^ function (cannot capture keyword "function" as keyword.function)
+//          TODO: keyword.function (currently not in AST)
 
 <<A4(1), A5, A6(1,3,4)>>
 newtype T3 as int = int;

tests/query/highlights/hack/generics.hack

@@ -8,6 +8,7 @@ class Box<T> {
   public function __construct(T $data) {
   //                          ^ type
   //                             ^ parameter
+  //        ^ keyword.function
   // ^ keyword
   //                    ^ method
     $this->data = $data;

tests/query/highlights/hack/shapes.hack

@@ -0,0 +1,12 @@
+class C extends Superclass implements Iface {
+//      ^ keyword          ^ keyword
+  use Trait;
+  // < include
+  const type X = shape(
+  // <- keyword ^ type.builtin
+    "a" => int,
+  // ^ string
+    "b" => string,
+  //       ^ type.builtin
+  );
+}