Add Lexer class

assets/parser.d.erb

@@ -69,6 +69,8 @@ class <%= classname %>
         }
     }
 
+    class Lexer
+    {
         enum
         {
 <% @grammar.tokens.each_with_index do |token, index| %>
@@ -95,7 +97,7 @@ class <%= classname %>
             uint destination;
         }
 
-    private struct LexerState
+        private struct State
         {
             uint transition_table_index;
             uint n_transitions;
@@ -109,9 +111,9 @@ class <%= classname %>
 <% end %>
         ];
 
-    private static const LexerState lexer_states[] = [
+        private static const State states[] = [
 <% state_table.each do |state_table_entry| %>
-        LexerState(<%= state_table_entry[:transition_table_index] %>u, <%= state_table_entry[:n_transitions] %>u, <%= state_table_entry[:accepts] %>u),
+            State(<%= state_table_entry[:transition_table_index] %>u, <%= state_table_entry[:n_transitions] %>u, <%= state_table_entry[:accepts] %>u),
 <% end %>
         ];
 
@@ -132,4 +134,5 @@ class <%= classname %>
             uint code_point = Decoder.decode_code_point(input, input_length, &code_point_length);
             return null;
         }
+    }
 }