Moving prepopulated search engines to a JSON file.

tools/json_to_struct/json_to_struct.py

+# Copyright 2012 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.
+
+import json
+from datetime import datetime
+import os.path
+import sys
+import optparse
+_script_path = os.path.realpath(__file__)
+sys.path.insert(0, os.path.normpath(_script_path + "/../../"))
+import json_comment_eater
+import struct_generator
+import element_generator
+
+HEAD = """// Copyright (c) %d 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.
+
+// GENERATED FROM THE SCHEMA DEFINITION AND CONTENT IN
+//   %s
+//   %s
+// DO NOT EDIT.
+
+"""
+
+def GenerateHeaderGuard(h_filename):
+  return (('%s_' % h_filename)
+          .upper().replace(os.sep, '_').replace('/', '_').replace('.', '_'))
+
+def GenerateH(fileroot, head, namespace, schema, content):
+  h_filename = fileroot + '.h'
+  with open(h_filename, 'w') as f:
+    f.write(head)
+    header_guard = GenerateHeaderGuard(h_filename)
+    f.write('#ifndef %s\n' % header_guard)
+    f.write('#define %s\n' % header_guard)
+    f.write('\n')
+
+    try:
+      for header in schema['headers']:
+        f.write('#include "%s"\n' % header)
+    except KeyError:
+      pass
+    f.write('\n')
+
+    if namespace:
+      f.write('namespace %s {\n' % namespace)
+      f.write('\n')
+
+    f.write(struct_generator.GenerateStruct(
+      schema['type_name'], schema['schema']))
+    f.write('\n')
+
+    f.write('extern const int kCurrentDataVersion;')
+    f.write('\n')
+
+    for element_name, element in content['engines'].items():
+      f.write('extern const %s %s;\n' % (schema['type_name'], element_name))
+
+    if namespace:
+      f.write('\n')
+      f.write('}  // namespace %s\n' % namespace)
+
+    f.write('\n')
+    f.write( '#endif  // %s\n' % header_guard)
+
+def GenerateCC(fileroot, head, namespace, schema, content):
+  with open(fileroot + '.cc', 'w') as f:
+    f.write(head)
+
+    f.write('#include <stdio.h>\n')
+    f.write('\n')
+    f.write('#include "%s"\n' % (fileroot + '.h'))
+    f.write('\n')
+
+    if namespace:
+      f.write('namespace %s {\n' % namespace)
+      f.write('\n')
+
+    f.write(element_generator.GenerateElements(schema['type_name'],
+        schema['schema'], content))
+
+    if namespace:
+      f.write('\n')
+      f.write('}  // namespace %s\n' % namespace)
+
+def Load(filename):
+  with open(filename, 'r') as handle:
+    schema = json.loads(json_comment_eater.Nom(handle.read()))
+  return schema
+
+if __name__ == '__main__':
+  parser = optparse.OptionParser(
+      description='Generates an C++ array of struct from a JSON description.',
+      usage='usage: %prog [option] -s schema description')
+  parser.add_option('-d', '--destdir',
+      help='root directory to output generated files.')
+  parser.add_option('-n', '--namespace',
+      help='C++ namespace for generated files. e.g search_providers.')
+  parser.add_option('-s', '--schema', help='path to the schema file, '
+      'mandatory.')
+  (opts, args) = parser.parse_args()
+
+  if not args:
+    sys.exit(0) # This is OK as a no-op
+  if not opts.schema:
+    parser.error('You must specify a --schema.')
+
+  content_filename = os.path.normpath(args[0])
+  root, ext = os.path.splitext(content_filename)
+  shortroot = os.path.split(root)[1]
+  if opts.destdir:
+    output_root = os.path.join(os.path.normpath(opts.destdir), shortroot)
+  else:
+    output_root = shortroot
+
+  schema = Load(opts.schema)
+  content = Load(content_filename)
+
+  head = HEAD % (datetime.now().year, opts.schema, content_filename)
+  GenerateH(output_root, head, opts.namespace, schema, content)
+  GenerateCC(output_root, head, opts.namespace, schema, content)