Source code for wolframclient.utils.datastructures

from __future__ import absolute_import, print_function, unicode_literals

from collections import OrderedDict


class Association(OrderedDict):
    """ A :class:`~collections.OrderedDict` that serializes to an Association"""

    def __repr__(self):
        return dict.__repr__(self)


class Settings(dict):
    """
    Dictionary subclass enabling attribute lookup/assignment of keys/values.

    For example::

        >>> m = Settings({'foo': 'bar'})
        >>> m.foo
        'bar'
        >>> m.foo = 'not bar'
        >>> m['foo']
        'not bar'

    ``Settings`` objects also provide ``.first()`` which acts like
    ``.get()`` but accepts multiple keys as arguments, and returns the value of
    the first hit, e.g.::

        >>> m = Settings({'foo': 'bar', 'biz': 'baz'})
        >>> m.first('wrong', 'incorrect', 'foo', 'biz')
        'bar'

    """

    def __getattr__(self, key):
        try:
            return self[key]
        except KeyError:
            # to conform with __getattr__ spec
            raise AttributeError(key)

    def __setattr__(self, key, value):
        self[key] = value