
    a                         d dl Z ddZdS )    N 	ImmutableFc                 V    t           t                    r(                     dd                                            fd}d}t          j        dk     rd                    |          }d                    d	  D                       }d
                    ||rd|z  nd |            ||          }|rt          |           ddl	m
} t          |d          }	 t          ||           n5# t          $ r(}	t          t          |	          dz   |z             |	d}	~	ww xY w||         S )a  
    Produces a class that either can be used standalone or as a base class for persistent classes.

    This is a thin wrapper around a named tuple.

    Constructing a type and using it to instantiate objects:

    >>> Point = immutable('x, y', name='Point')
    >>> p = Point(1, 2)
    >>> p2 = p.set(x=3)
    >>> p
    Point(x=1, y=2)
    >>> p2
    Point(x=3, y=2)

    Inheriting from a constructed type. In this case no type name needs to be supplied:

    >>> class PositivePoint(immutable('x, y')):
    ...     __slots__ = tuple()
    ...     def __new__(cls, x, y):
    ...         if x > 0 and y > 0:
    ...             return super(PositivePoint, cls).__new__(cls, x, y)
    ...         raise Exception('Coordinates must be positive!')
    ...
    >>> p = PositivePoint(1, 2)
    >>> p.set(x=3)
    PositivePoint(x=3, y=2)
    >>> p.set(y=-3)
    Traceback (most recent call last):
    Exception: Coordinates must be positive!

    The persistent class also supports the notion of frozen members. The value of a frozen member
    cannot be updated. For example it could be used to implement an ID that should remain the same
    over time. A frozen member is denoted by a trailing underscore.

    >>> Point = immutable('x, y, id_', name='Point')
    >>> p = Point(1, 2, id_=17)
    >>> p.set(x=3)
    Point(x=3, y=2, id_=17)
    >>> p.set(id_=18)
    Traceback (most recent call last):
    AttributeError: Cannot set frozen members id_
    , c                  v    d D             } | r)d                     d                    |                     S dS )Nc                 B    g | ]}|                     d           d|z  S )_'%s')endswith).0fs     7/usr/lib/python3/dist-packages/pyrsistent/_immutable.py
<listcomp>z9immutable.<locals>.frozen_member_test.<locals>.<listcomp>5   s+    IIICI&1*III    z
        frozen_fields = fields_to_modify & set([{frozen_members}])
        if frozen_fields:
            raise AttributeError('Cannot set frozen members %s' % ', '.join(frozen_fields))
            , )frozen_membersr   )formatjoin)r   memberss    r   frozen_member_testz%immutable.<locals>.frozen_member_test4   sN    IIgIII 	A dii&?&?@@	A rr   r   )      z, verbose={verbose})verboser   c              3       K   | ]	}d |z  V  
dS )r   N )r   ms     r   	<genexpr>zimmutable.<locals>.<genexpr>D   s&      ;;avz;;;;;;r   a  
class {class_name}(namedtuple('ImmutableBase', [{quoted_members}]{verbose_string})):
    __slots__ = tuple()

    def __repr__(self):
        return super({class_name}, self).__repr__().replace('ImmutableBase', self.__class__.__name__)

    def set(self, **kwargs):
        if not kwargs:
            return self

        fields_to_modify = set(kwargs.keys())
        if not fields_to_modify <= {member_set}:
            raise AttributeError("'%s' is not a member" % ', '.join(fields_to_modify - {member_set}))

        {frozen_member_test}

        return self.__class__.__new__(self.__class__, *map(kwargs.pop, [{quoted_members}], self))
z	set([%s])zset())quoted_members
member_setr   verbose_string
class_namer   )
namedtuplepyrsistent_immutable)r#   __name__z:
N)
isinstancestrreplacesplitsysversion_infor   r   printcollectionsr#   dictexecSyntaxError)
r   namer   r   r!   r   templater#   	namespacees
   `         r   	immutabler5      s}   Z '3 4//#s++1133	 	 	 	 	 N
&  .55g5FFYY;;7;;;;;N$ F.:HU+66g"4"4"6"6,	     % 0  h&&&&&&
5KLLLI<Xy!!!! < < <#a&&5.8344!;< T?s   C. .
D 8#DD )r   r   F)r*   r5   r   r   r   <module>r6      s2    



c c c c c cr   