1 files changed, 9 insertions, 5 deletions
diff --git a/src/guff/template-token.cr b/src/guff/template-token.cr
index 04e8f11..35170d8 100644
--- a/src/guff/template-token.cr
+++ b/src/guff/template-token.cr
@@ -1,20 +1,24 @@
 module Guff
   class TemplateToken
     getter :type
+    getter :value
 
-    def initialize(@type : Symbol, @val : String)
+    TOKEN_TYPES = %i{key val}
+
+    def initialize(@type : Symbol, @value : String)
+      raise "invalid type: %s" % [@type] unless TOKEN_TYPES.includes?(@type)
     end
 
     def get(args : Hash(String, String))
       case @type
       when :key
-        raise "missing key: #{@val}" unless args.has_key?(@val)
-        args[@val]
+        raise "missing key: %s" % [@value] unless args.has_key?(@value)
+        args[@value]
       when :val
-        @val
+        @value
       else
         # never reached
-        raise "unknown token type: #{@type}"
+        raise "unknown token type: %s" % [@type]
       end
     end
   end