• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1# Copyright 2014 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"""Helper functions useful when writing scripts that are run from GN's
6exec_script function."""
7
8class GNException(Exception):
9  pass
10
11
12def ToGNString(value, allow_dicts = True):
13  """Prints the given value to stdout.
14
15  allow_dicts indicates if this function will allow converting dictionaries
16  to GN scopes. This is only possible at the top level, you can't nest a
17  GN scope in a list, so this should be set to False for recursive calls."""
18  if isinstance(value, str):
19    if value.find('\n') >= 0:
20      raise GNException("Trying to print a string with a newline in it.")
21    return '"' + value.replace('"', '\\"') + '"'
22
23  if isinstance(value, list):
24    return '[ %s ]' % ', '.join(ToGNString(v) for v in value)
25
26  if isinstance(value, dict):
27    if not allow_dicts:
28      raise GNException("Attempting to recursively print a dictionary.")
29    result = ""
30    for key in value:
31      if not isinstance(key, str):
32        raise GNException("Dictionary key is not a string.")
33      result += "%s = %s\n" % (key, ToGNString(value[key], False))
34    return result
35
36  if isinstance(value, int):
37    return str(value)
38
39  raise GNException("Unsupported type when printing to GN.")
40