[mojo] Add mojom parser support for native-only structs

mojo/public/tools/bindings/pylib/mojom/parse/parser.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generates a syntax tree from a Mojo IDL file."""
 
 import imp
 import os.path
 import sys
 
@@ skipping 137 matching lines @@
   def p_attribute(self, p):
     """attribute : NAME EQUALS evaled_literal
                  | NAME EQUALS NAME"""
     p[0] = ast.Attribute(p[1], p[3], filename=self.filename, lineno=p.lineno(1))
 
   def p_evaled_literal(self, p):
     """evaled_literal : literal"""
     # 'eval' the literal to strip the quotes.
     p[0] = eval(p[1])
 
-  def p_struct(self, p):
+  def p_struct_1(self, p):
     """struct : attribute_section STRUCT NAME LBRACE struct_body RBRACE SEMI"""
     p[0] = ast.Struct(p[3], p[1], p[5])
 
+  def p_struct_2(self, p):
+    """struct : attribute_section STRUCT NAME SEMI"""
+    p[0] = ast.Struct(p[3], p[1], None)
+
   def p_struct_body_1(self, p):
     """struct_body : """
     p[0] = ast.StructBody()
 
   def p_struct_body_2(self, p):
     """struct_body : struct_body const
                    | struct_body enum
                    | struct_body struct_field"""
     p[0] = p[1]
     p[0].Append(p[2])
@@ skipping 243 matching lines @@
 
 def Parse(source, filename):
   lexer = Lexer(filename)
   parser = Parser(lexer, source, filename)
 
   lex.lex(object=lexer)
   yacc.yacc(module=parser, debug=0, write_tables=0)
 
   tree = yacc.parse(source)
   return tree