[Bindings] Add option parser in aggregate_generated_bindings.py

third_party/WebKit/Source/bindings/scripts/aggregate_generated_bindings.py

 #!/usr/bin/python
 #
 # Copyright (C) 2009 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.
@@ skipping 20 matching lines @@
 # Copyright (c) 2009 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.
 
 """Generate aggregate .cpp files that include multiple V8 binding .cpp files.
 
 This can be a single output file, to preserve symbol space; or multiple output
 files, to reduce maximum compilation unit size and allow parallel compilation.
 
 Usage:
-aggregate_generated_bindings.py COMPONENT_DIR IDL_FILES_LIST -- OUTPUT_FILE1 OUTPUT_FILE2 ...
+aggregate_generated_bindings.py --component-directory COMPONENT_DIR --input-file IDL_FILES_LIST OUTPUT_FILE1 OUTPUT_FILE2 ...
 
 COMPONENT_DIR is the relative directory of a component, e.g., 'core', 'modules'.
 IDL_FILES_LIST is a text file containing the IDL file paths, so the command
 line doesn't exceed OS length limits.
 OUTPUT_FILE1 etc. are filenames of output files.
 
 Design doc: http://www.chromium.org/developers/design-documents/idl-build
 """
 
 import errno
+import optparse
 import os
 import re
 import sys
 
 from utilities import should_generate_impl_file_from_idl, get_file_contents, idl_filename_to_component, idl_filename_to_interface_name, read_idl_files_list_from_file
 
 COPYRIGHT_TEMPLATE = """/*
  * THIS FILE WAS AUTOMATICALLY GENERATED, DO NOT EDIT.
  *
  * This file was generated by the action_derivedsourcesallinone.py script.
@@ skipping 72 matching lines @@
 
 def write_content(content, output_file_name):
     parent_path, file_name = os.path.split(output_file_name)
     if not os.path.exists(parent_path):
         print 'Creating directory: %s' % parent_path
         os.makedirs(parent_path)
     with open(output_file_name, 'w') as f:
         f.write(content)
 
 
-def main(args):
-    if len(args) <= 4:
-        raise Exception('Expected at least 5 arguments.')
-    component_dir = args[1]
-    input_file_name = args[2]
-    in_out_break_index = args.index('--')
-    output_file_names = args[in_out_break_index + 1:]
+def parse_options():
+    parser = optparse.OptionParser()
+    parser.add_option('--component-directory')
+    parser.add_option('--input-file',
+                      help='A file name which lists up target IDL file names.',
+                      type='string')
+
+    options, output_file_names = parser.parse_args()
+    if len(output_file_names) == 0:
+        raise Exception('Expected at least one output file name(s).')
+    if not options.input_file:
+        raise Exception('No input file is specified.')
+
+    return options, output_file_names
+
+
+def main():
+    options, output_file_names = parse_options()
+    component_dir = options.component_directory
+    input_file_name = options.input_file
 
     idl_file_names = read_idl_files_list_from_file(input_file_name,
                                                    is_gyp_format=True)
     components = set([idl_filename_to_component(filename)
                       for filename in idl_file_names])
     if len(components) != 1:
         raise Exception('Cannot aggregate generated codes in different components')
     aggregate_partial_interfaces = component_dir not in components
 
     files_meta_data = extract_meta_data(idl_file_names)
     total_partitions = len(output_file_names)
     for partition, file_name in enumerate(output_file_names):
         files_meta_data_this_partition = [
                 meta_data for meta_data in files_meta_data
                 if hash(meta_data['name']) % total_partitions == partition]
         file_contents = generate_content(component_dir,
                                          aggregate_partial_interfaces,
                                          files_meta_data_this_partition)
         write_content(file_contents, file_name)
 
 
 if __name__ == '__main__':
-    sys.exit(main(sys.argv))
+    sys.exit(main())