| Current File : //usr/lib/python3.6/site-packages/cloudinit/safeyaml.py |
# Copyright (C) 2012 Canonical Ltd.
#
# Author: Scott Moser <[email protected]>
#
# This file is part of cloud-init. See LICENSE file for license information.
import yaml
YAMLError = yaml.YAMLError
class _CustomSafeLoader(yaml.SafeLoader):
def construct_python_unicode(self, node):
return self.construct_scalar(node)
_CustomSafeLoader.add_constructor(
"tag:yaml.org,2002:python/unicode",
_CustomSafeLoader.construct_python_unicode,
)
class NoAliasSafeDumper(yaml.dumper.SafeDumper):
"""A class which avoids constructing anchors/aliases on yaml dump"""
def ignore_aliases(self, data):
return True
def load(blob):
return yaml.load(blob, Loader=_CustomSafeLoader)
def dumps(obj, explicit_start=True, explicit_end=True, noalias=False):
"""Return data in nicely formatted yaml."""
return yaml.dump(
obj,
line_break="\n",
indent=4,
explicit_start=explicit_start,
explicit_end=explicit_end,
default_flow_style=False,
Dumper=(NoAliasSafeDumper if noalias else yaml.dumper.Dumper),
)
# vi: ts=4 expandtab