B
    (d                 @   s   d dl Z dddZdS )    N 	ImmutableFc       	   
      s   t  tr dd   fdd}ddd  D }dj||rLd	| nd
| |d}|rft| ddlm} t	|dd}yt
|| W n8 tk
r } ztt|d | |W dd}~X Y nX || 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                 s(   dd  D } | r$dj d| dS dS )Nc             S   s   g | ]}| d rd| qS )_z'%s')endswith).0f r
   b/work/yifan.wang/ringdown/master-ringdown-env/lib/python3.7/site-packages/pyrsistent/_immutable.py
<listcomp>5   s    z9immutable.<locals>.frozen_member_test.<locals>.<listcomp>z
        frozen_fields = fields_to_modify & set([{frozen_members}])
        if frozen_fields:
            raise AttributeError('Cannot set frozen members %s' % ', '.join(frozen_fields))
            z, )frozen_membersr   )formatjoin)r   )membersr
   r   frozen_member_test4   s    z%immutable.<locals>.frozen_member_testz, c             s   s   | ]}d | V  qdS )z'%s'Nr
   )r   mr
   r
   r   	<genexpr>?   s    zimmutable.<locals>.<genexpr>aq  
class {class_name}(namedtuple('ImmutableBase', [{quoted_members}])):
    __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_membersZ
member_setr   
class_namer   )
namedtupleZpyrsistent_immutable)r   __name__z:
N)
isinstancestrreplacesplitr   r   printcollectionsr   dictexecSyntaxError)	r   nameverboser   r   templater   	namespaceer
   )r   r   	immutable   s"    -
(r&   )r   r   F)sysr&   r
   r
   r
   r   <module>   s   