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Current File : /usr/lib/python3.6/site-packages/cloudinit//safeyaml.py
# 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(
    "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),
    )


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