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.") 40
