Simple rewrite of generate-bindings.pl in Python

Source/bindings/scripts/generate_bindings.py

+#!/usr/bin/python
+# 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
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import optparse
+import os.path
+import pprint
+import sys
+
+import json_import_export
+import code_generator_v8
+
+
+def parse_options():
+    parser = optparse.OptionParser()
+    parser.add_option('--output-directory')
+
+    options, args = parser.parse_args()
+    if options.output_directory is None:
+        parser.error('Must specify output directory using --output-directory.')
+    if len(args) != 1:
+        parser.error('Must specify exactly 1 input file as argument, but %d given.' % len(args))
+    options.target_json_file = args[0]
+    return options
+
+
+def main():
+    options = parse_options()
+    target_json_file = os.path.realpath(options.target_json_file)
+
+    target_document = json_import_export.read_json(target_json_file)
+    pprint.pprint(target_document)
+
+    code_generator = code_generator_v8.CodeGenerator(target_document)
+    code_generator.write_interfaces(options.output_directory)
+
+
+if __name__ == '__main__':
+    sys.exit(main())