IDL roll.

core/scripts/in_generator.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 31 matching lines @@
         self.in_file = InFile.load_from_path(in_file_path, self.defaults, self.default_parameters)
 
     # Subclasses should override.
     def generate_header(self):
         raise NotImplementedError
 
     # Subclasses should override.
     def generate_implementation(self):
         raise NotImplementedError
 
+    def wrap_with_condition(self, string, condition):
+        if not condition:
+            return string
+        return "#if ENABLE(%(condition)s)\n%(string)s\n#endif" % { 'condition' : condition, 'string' : string }
+
     def _forcibly_create_text_file_at_path_with_contents(self, file_path, contents):
         # FIXME: This method can be made less force-full anytime after 6/1/2013.
         # A gyp error was briefly checked into the tree, causing
         # a directory to have been generated in place of one of
         # our output files.  Clean up after that error so that
         # all users don't need to clobber their output directories.
         shutil.rmtree(file_path, ignore_errors=True)
         # The build system should ensure our output directory exists, but just in case.
         directory = os.path.dirname(file_path)
         if not os.path.exists(directory):
             os.makedirs(directory)
 
         with open(file_path, "w") as file_to_write:
             file_to_write.write(contents)
 
     def write_header(self, output_dir):
-        header_path = os.path.join(output_dir, self.class_name + ".h")
-        self._forcibly_create_text_file_at_path_with_contents(header_path, self.generate_header())
+        contents = self.generate_header()
+        if not contents:
+            return
+        path = os.path.join(output_dir, self.class_name + ".h")
+        self._forcibly_create_text_file_at_path_with_contents(path, contents)
 
     def write_implmentation(self, output_dir):
-        implmentation_path = os.path.join(output_dir, self.class_name + ".cpp")
-        self._forcibly_create_text_file_at_path_with_contents(implmentation_path, self.generate_implementation())
+        contents = self.generate_implementation()
+        if not contents:
+            return
+        path = os.path.join(output_dir, self.class_name + ".cpp")
+        self._forcibly_create_text_file_at_path_with_contents(path, contents)
 
 
 class Maker(object):
     def __init__(self, writer_class):
         self._writer_class = writer_class
 
     def main(self, argv):
         script_name = os.path.basename(argv[0])
         args = argv[1:]
         if len(args) < 1:
             print "USAGE: %i INPUT_FILE [OUTPUT_DIRECTORY]" % script_name
             exit(1)
         output_dir = args[1] if len(args) > 1 else os.getcwd()
 
         writer = self._writer_class(args[0])
         writer.write_header(output_dir)
         writer.write_implmentation(output_dir)