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# Copyright 2014 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.
"""Helper functions useful when writing scripts that are run from GN's
exec_script function."""
class GNException(Exception):
pass
def ToGNString(value, allow_dicts = True):
"""Prints the given value to stdout.
allow_dicts indicates if this function will allow converting dictionaries
to GN scopes. This is only possible at the top level, you can't nest a
GN scope in a list, so this should be set to False for recursive calls."""
if isinstance(value, str):
if value.find('\n') >= 0:
raise GNException("Trying to print a string with a newline in it.")
return '"' + value.replace('"', '\\"') + '"'
if isinstance(value, list):
return '[ %s ]' % ', '.join(ToGNString(v) for v in value)
if isinstance(value, dict):
if not allow_dicts:
raise GNException("Attempting to recursively print a dictionary.")
result = ""
for key in value:
if not isinstance(key, str):
raise GNException("Dictionary key is not a string.")
result += "%s = %s\n" % (key, ToGNString(value[key], False))
return result
if isinstance(value, int):
return str(value)
raise GNException("Unsupported type when printing to GN.")
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