Convert Settings.in, CSSValueKeywords.in, SVGCSSValueKeywords.in to json5

third_party/WebKit/Source/build/scripts/json5_generator.py

 # Copyright (c) 2017 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.
 
 """Generic generator for configuration files in JSON5 format.
 
 The configuration file is expected to contain either a data array or a data map,
 an optional parameters validation map, and an optional metdata map. Examples:
 {
   data: [
@@ skipping 79 matching lines @@
 
 
 class Json5File(object):
     def __init__(self, doc, default_metadata=None):
         self.name_dictionaries = []
         self.metadata = copy.deepcopy(default_metadata if default_metadata else {})
         self._defaults = {}
         self._process(doc)
 
     @classmethod
-    def load_from_files(cls, file_paths, default_metadata):
+    def load_from_files(cls, file_paths, default_metadata=None):
         merged_doc = dict()
         for path in file_paths:
             assert path.endswith(".json5")
             with open(os.path.abspath(path)) as json5_file:
                 doc = _json5_load(json5_file.read())
                 if not merged_doc:
                     merged_doc = doc
                 else:
                     _merge_doc(merged_doc, doc)
         return Json5File(merged_doc, default_metadata)
@@ skipping 113 matching lines @@
         parser.add_argument("--developer_dir", help="Path to Xcode.")
         parser.add_argument("--output_dir", default=os.getcwd())
         args = parser.parse_args()
 
         if args.developer_dir:
             os.environ["DEVELOPER_DIR"] = args.developer_dir
 
         writer = self._writer_class(args.files)
         writer.set_gperf_path(args.gperf)
         writer.write_files(args.output_dir)