Add all storage classes

grammar.coffee

@@ -174,9 +174,11 @@ module.exports =
       enum_value: -> seq(
         @identifier, optional(seq("=", @expression)))
 
-      storage_class: -> repeat(choice(
+      storage_class: -> choice(
+        keyword("extern"),
         keyword("static"),
-        keyword("extern"))),
+        keyword("auto"),
+        keyword("register"))
 
       field: -> seq(@type, @type_expression)
 

grammar_test/declarations.txt

@@ -69,12 +69,32 @@ float d, e;
 
 (program
   (var_declaration (primitive_type (identifier)) (identifier))
-  (var_declaration (primitive_type (identifier))
+  (var_declaration
+    (primitive_type (identifier))
     (identifier)
     (var_assignment (identifier) (number))
     (identifier))
   (var_declaration (identifier) (identifier) (identifier)))
 
+============================================
+Variable storage classes
+============================================
+
+int a;
+extern int b, c;
+auto int d;
+register int e;
+static int f;
+
+---
+
+(program
+  (var_declaration (identifier) (identifier))
+  (var_declaration (storage_class) (identifier) (identifier) (identifier))
+  (var_declaration (storage_class) (identifier) (identifier))
+  (var_declaration (storage_class) (identifier) (identifier))
+  (var_declaration (storage_class) (identifier) (identifier)))
+
 ============================================
 Composite-typed variable declarations
 ============================================