Revert 167793 - Moving prepopulated search engines to a JSON file.

tools/json_to_struct/json_to_struct.py

-#!/usr/bin/env python
-# 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.
-
-# Format for the JSON schema file:
-# {
-#   "type_name": "DesiredCStructName",
-#   "headers": [          // Optional list of headers to be included by the .h.
-#     "path/to/header.h"
-#   ],
-#   "schema": [           // Fields of the generated structure.
-#     {
-#       "field": "my_enum_field",
-#       "type": "enum",   // Either: int, string, string16, enum, array.
-#       "default": "RED", // Optional. Cannot be used for array.
-#       "ctype": "Color"  // Only for enum, specify the C type.
-#     },
-#     {
-#       "field": "my_int_array_field",  // my_int_array_field_size will also
-#       "type": "array",                // be generated.
-#       "contents": {
-#         "type": "int"   // Either: int, string, string16, enum, array.
-#       }
-#     },
-#     ...
-#   ]
-# }
-#
-# Format for the JSON description file:
-# {
-#   "int_variables": {    // An optional list of constant int variables.
-#     "kDesiredConstantName": 45
-#   },
-#   "elements": {         // All the elements for which to create static
-#                         // initialization code in the .cc file.
-#     "my_const_variable": {
-#       "my_int_field": 10,
-#       "my_string_field": "foo bar",
-#       "my_enum_field": "BLACK",
-#       "my_int_array_field": [ 1, 2, 3, 5, 7 ],
-#     },
-#     "my_other_const_variable": {
-#       ...
-#     }
-#   }
-# }
-
-import json
-from datetime import datetime
-import os.path
-import sys
-import optparse
-import copy
-_script_path = os.path.realpath(__file__)
-
-sys.path.insert(0, os.path.normpath(_script_path + "/../../"))
-try:
-  import json_comment_eater
-finally:
-  sys.path.pop(0)
-
-import struct_generator
-import element_generator
-
-HEAD = """// Copyright %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 DESCRIPTION IN
-//   %s
-//   %s
-// DO NOT EDIT.
-
-"""
-
-def _GenerateHeaderGuard(h_filename):
-  """Generates the string used in #ifndef guarding the header file.
-  """
-  return (('%s_' % h_filename)
-          .upper().replace(os.sep, '_').replace('/', '_').replace('.', '_'))
-
-def _GenerateH(fileroot, head, namespace, schema, description):
-  """Generates the .h file containing the definition of the structure specified
-  by the schema.
-
-  Args:
-    fileroot: The filename and path of the file to create, without an extension.
-    head: The string to output as the header of the .h file.
-    namespace: A string corresponding to the C++ namespace to use.
-    schema: A dict containing the schema. See comment at the top of this file.
-    description: A dict containing the description. See comment at the top of
-        this file.
-  """
-
-  h_filename = fileroot + '.h'
-  with open(h_filename, 'w') as f:
-    f.write(head)
-
-    f.write('#include <cstddef>\n')
-    f.write('\n')
-
-    header_guard = _GenerateHeaderGuard(h_filename)
-    f.write('#ifndef %s\n' % header_guard)
-    f.write('#define %s\n' % header_guard)
-    f.write('\n')
-
-    for header in schema.get('headers', []):
-      f.write('#include "%s"\n' % header)
-    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')
-
-    for var_name, value in description.get('int_variables', []).items():
-      f.write('extern const int %s;\n' % var_name)
-    f.write('\n')
-
-    for element_name, element in description['elements'].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, description):
-  """Generates the .cc file containing the static initializers for the
-  of the elements specified in the description.
-
-  Args:
-    fileroot: The filename and path of the file to create, without an extension.
-    head: The string to output as the header of the .cc file.
-    namespace: A string corresponding to the C++ namespace to use.
-    schema: A dict containing the schema. See comment at the top of this file.
-    description: A dict containing the description. See comment at the top of
-        this file.
-  """
-  with open(fileroot + '.cc', 'w') as f:
-    f.write(head)
-
-    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'], description))
-
-    if namespace:
-      f.write('\n')
-      f.write('}  // namespace %s\n' % namespace)
-
-def _Load(filename):
-  """Loads a JSON file int a Python object and return this object.
-  """
-  # TODO(beaudoin): When moving to Python 2.7 use object_pairs_hook=OrderedDict.
-  with open(filename, 'r') as handle:
-    result = json.loads(json_comment_eater.Nom(handle.read()))
-  return result
-
-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 opts.schema:
-    parser.error('You must specify a --schema.')
-
-  description_filename = os.path.normpath(args[0])
-  root, ext = os.path.splitext(description_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)
-  description = _Load(description_filename)
-
-  head = HEAD % (datetime.now().year, opts.schema, description_filename)
-  _GenerateH(output_root, head, opts.namespace, schema, description)
-  _GenerateCC(output_root, head, opts.namespace, schema, description)