highlights(c/cpp): highlight case labels as constants

queries/c/highlights.scm

@@ -139,6 +139,8 @@
  (#lua-match? @constant "^[A-Z][A-Z0-9_]+$"))
 (enumerator
   name: (identifier) @constant)
+(case_statement
+  value: (identifier) @constant)
 
 ;; Preproc def / undef
 (preproc_def

queries/cpp/highlights.scm

@@ -38,6 +38,8 @@
                         (#lua-match? @type "^[A-Z]"))
 ((namespace_identifier) @constant
                         (#lua-match? @constant "^[A-Z][A-Z_0-9]*$"))
+(case_statement
+  value: (qualified_identifier (identifier) @constant))
 (namespace_definition
   name: (identifier) @namespace)
 

tests/query/highlights/c/enums-as-constants.c

@@ -0,0 +1,21 @@
+enum Foo{
+    a,
+//  ^ @constant
+    aa,
+//  ^ @constant
+    C,
+};
+
+void foo(enum Foo f){
+    switch ( f ) {
+        case a:
+         //  ^ @constant
+            break;
+        case aa:
+         //  ^ @constant
+            break;
+        case C:
+            break;
+        default:
+    }
+}

tests/query/highlights/cpp/enums-as-constants.cpp

@@ -0,0 +1,25 @@
+enum class Foo{
+    a,
+//  ^ @constant
+    aa,
+//  ^ @constant
+    C,
+//  ^ @constant
+};
+
+void foo(Foo f){
+    switch ( f ) {
+        case Foo::a:
+         //  ^ @type
+         //   ^ @namespace
+         //       ^ @constant
+            break;
+        case Foo::aa:
+         //        ^ @constant
+            break;
+        case Foo::C:
+         //       ^ @constant
+            break;
+        default:
+    }
+}