# Software License Agreement (BSD License)
#
# Copyright (c) 2012, Willow Garage, Inc.
# All rights reserved.
#
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# modification, are permitted provided that the following conditions
# are met:
#
#  * Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
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#    disclaimer in the documentation and/or other materials provided
#    with the distribution.
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def pack(data):
    """
    Packs 'data' into a form that can be easily and readably written to an ini file

    :param data:
        A list of strings or a list of items with a 'text' method to be flattened into a
        string ''list''
    :return: A string suitable for output to ini files ''str''
    """
    if len(data) == 0:
        return ''

    def _get_str(item):
        try:
            return item.text()
        except:
            return item

    data = [_get_str(value) for value in data]
    if len(data) == 1:
        return data[0]
    return data


def unpack(data):
    """
    Unpacks the values read from an ini file

    :param data: An entry taken from an ini file ''list or string''
    :return: A list of strings ''list''
    """
    if data is None or data == '':
        data = []
    elif is_string(data):
        data = [data]
    return data


def is_string(s):
    """Check if the argument is a string which works for both Python 2 and 3."""
    try:
        return isinstance(s, basestring)
    except NameError:
        return isinstance(s, str)
