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File name : yamlencoding.py
Content :
"""
Functions for adding yaml encoding to the jinja context
"""


import io
import sys

import yaml  # pylint: disable=blacklisted-import
from salt.utils.decorators.jinja import jinja_filter


@jinja_filter()
def yaml_dquote(text):
    """
    Make text into a double-quoted YAML string with correct escaping
    for special characters.  Includes the opening and closing double
    quote characters.
    """
    with io.StringIO() as ostream:
        yemitter = yaml.emitter.Emitter(ostream, width=sys.maxsize)
        yemitter.write_double_quoted(str(text))
        return ostream.getvalue()


@jinja_filter()
def yaml_squote(text):
    """
    Make text into a single-quoted YAML string with correct escaping
    for special characters.  Includes the opening and closing single
    quote characters.
    """
    with io.StringIO() as ostream:
        yemitter = yaml.emitter.Emitter(ostream, width=sys.maxsize)
        yemitter.write_single_quoted(str(text))
        return ostream.getvalue()


@jinja_filter()
def yaml_encode(data):
    """
    A simple YAML encode that can take a single-element datatype and return
    a string representation.
    """
    yrepr = yaml.representer.SafeRepresenter()
    ynode = yrepr.represent_data(data)
    if not isinstance(ynode, yaml.ScalarNode):
        raise TypeError(
            "yaml_encode() only works with YAML scalar data; failed for {}".format(
                type(data)
            )
        )

    tag = ynode.tag.rsplit(":", 1)[-1]
    ret = ynode.value

    if tag == "str":
        ret = yaml_dquote(ynode.value)

    return ret
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