brettw@chromium.org | c976b18 | 2014-04-06 13:35:10 +0900 | [diff] [blame] | 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 |
| 6 | exec_script function.""" |
| 7 | |
| 8 | class GNException(Exception): |
| 9 | pass |
| 10 | |
| 11 | |
| 12 | def 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.") |