# 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