tools/json_to_struct/struct_generator.py

   1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 def _GenerateArrayField(field_info):
   6   """Generate a string defining an array field in a C structure.
   7   """
   8   contents = field_info['contents']
   9   contents['field'] = '* ' + field_info['field']
  10   if contents['type'] == 'array':
  11     raise RuntimeError('Nested arrays are not supported.')
  12   return (GenerateField(contents) + ';\n' +
  13           '  const size_t %s_size') % field_info['field'];
  14
  15 def GenerateField(field_info):
  16   """Generate a string defining a field of the type specified by
  17   field_info['type'] in a C structure.
  18   """
  19   field = field_info['field']
  20   type = field_info['type']
  21   if type == 'int':
  22     return 'const int %s' % field
  23   elif type == 'string':
  24     return 'const char* const %s' % field
  25   elif type == 'string16':
  26     return 'const wchar_t* const %s' % field
  27   elif type == 'enum':
  28     return 'const %s %s' % (field_info['ctype'], field)
  29   elif type == 'array':
  30     return _GenerateArrayField(field_info)
  31   elif type == 'struct':
  32     return 'const %s %s' % (field_info['type_name'], field)
  33   else:
  34     raise RuntimeError('Unknown field type "%s"' % type)
  35
  36 def GenerateStruct(type_name, schema):
  37   """Generate a string defining a structure containing the fields specified in
  38   the schema list.
  39   """
  40   lines = [];
  41   lines.append('struct %s {' % type_name)
  42   for field_info in schema:
  43     if field_info['type'] == 'struct':
  44       lines.insert(0, GenerateStruct(field_info['type_name'],
  45                                      field_info['fields']))
  46     elif (field_info['type'] == 'array'
  47           and field_info['contents']['type'] == 'struct'):
  48       contents = field_info['contents']
  49       lines.insert(0, GenerateStruct(contents['type_name'],
  50                                      contents['fields']))
  51     lines.append('  ' + GenerateField(field_info) + ';')
  52   lines.append('};');
  53   return '\n'.join(lines) + '\n';