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# Copyright (C) 2012 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
#
# 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(
u'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
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