U
� �Qi � @ s. d dl mZ d dlmZ ze W n ek
r< dd� ZY nX zd dlmZ W n G dd� de�ZY nX zd dl m
Z
W n e k
r� d d
� Z
Y nX G d d � d e �Z
d
e
_G dd
� d
e �Zz eefZW n ek
r� eZY nX dd� ZeefZG dd� de�Zddd�Zddd�ZG dd� de �ZdS ) � )�ref)�BoundMethodWeakrefc C s
t | d�S )N�__call__)�hasattr)�object� r �/_utilities.py�callable s r )� defaultdictc @ sN e Zd Zddd�Zdd� Zdd� Zdd � Zd
d � Zd d
� Zdd� Z dd� Z
dS )r
Nc O s6 |d k rt |d�std��tj| f|�|� || _d S )Nr z first argument must be callable)r � TypeError�dict�__init__�default_factory)�selfr �a�kwr r r r
s �zdefaultdict.__init__c C s2 zt �| |�W S tk
r, | �|� Y S X d S �N)r � __getitem__�KeyError� __missing__)r �keyr r r r s zdefaultdict.__getitem__c C s& | j d krt|��| � � | |< }|S r )r r )r r �valuer r r r s
zdefaultdict.__missing__c C s0 | j d krt� }n| j f}t| �|d d | �� fS r )r �tuple�type�items)r �argsr r r �
__reduce__% s
zdefaultdict.__reduce__c C s | � � S r )�__copy__�r r r r �copy, s zdefaultdict.copyc C s t | �| j| �S r )r r r r r r r / s zdefaultdict.__copy__c C s" dd l }t| �| j|�| �� ��S )Nr )r r r Zdeepcopyr )r Zmemor r r r � __deepcopy__2 s
�zdefaultdict.__deepcopy__c C s d| j t�| �f S )Nzdefaultdict(%s, %s))r r �__repr__r r r r r! 7 s �zdefaultdict.__repr__)N) �__name__�
__module__� __qualname__r
r r r r r r r! r r r r r
s
r
)�contextmanagerc C s dd� }| j |_ |S )Nc _ s t d��d S )Nz8Python 2.5 or above is required to use context managers.)� RuntimeError)r r r r r �oops@ s z contextmanager.<locals>.oops)r" )�fnr' r r r r% ? s r% c @ s$ e Zd Zdd� Zdd� Zdd� ZdS )�_symbolc C s | | _ | _dS )z Construct a new named symbol.N)r" �name)r r* r r r r
H s z_symbol.__init__c C s t | jffS r )�symbolr* r r r r r L s z_symbol.__reduce__c C s | j S r )r* r r r r r! O s z_symbol.__repr__N)r" r# r$ r
r r! r r r r r) F s r) r+ c @ s e Zd ZdZi Zdd� ZdS )r+ a? A constant symbol.
>>> symbol('foo') is symbol('foo')
True
>>> symbol('foo')
foo
A slight refinement of the MAGICCOOKIE=object() pattern. The primary
advantage of symbol() is its repr(). They are also singletons.
Repeated calls of symbol('name') will all return the same instance.
c C s8 z | j | W S tk
r2 | j �|t|�� Y S X d S r )�symbolsr �
setdefaultr) )�clsr* r r r �__new__d s zsymbol.__new__N)r" r# r$ �__doc__r, r/ r r r r r+ T s
c C sV t | d�r t| j�t| j�fS t | d�r<t| j�t| j�fS t| t�rJ| S t| �S d S )N�__func__�im_func)r �idr1 �__self__r2 �im_self�
isinstance�text)�objr r r �hashable_identityq s
r9 c @ s e Zd ZdZdS )�annotatable_weakrefz7A weakref.ref that supports custom instance attributes.N)r" r# r$ r0 r r r r r: s r: Nc K s@ t | �rt| |�}n
t| |�}|�� D ]\}}t|||� q&|S )z Return an annotated weak ref.)r �callable_referencer: r �setattr)r �callbackZ annotationsZweakr r r r r � reference� s
r> c C sJ t | d�r | jdk r t| |d�S t | d�r@| jdk r@t| |d�S t| |�S )z@Return an annotated weak ref, supporting bound instance methods.r5 N)�targetZ on_deleter4 )r r5 r r4 r: )r r= r r r r; � s
r; c @ s e Zd ZdZdd� Zdd� ZdS )�
lazy_propertyz(A @property that is only evaluated once.c C s || _ |j| _d S r )� _deferredr0 )r Zdeferredr r r r
� s zlazy_property.__init__c C s* |d kr | S | � |�}t|| j j|� |S r )rA r< r" )r r8 r. r r r r �__get__� s
zlazy_property.__get__N)r" r# r$ r0 r
rB r r r r r@ � s r@ )N)N)�weakrefr Zblinker._saferefr r � NameError� collectionsr
r �
contextlibr% � ImportErrorr r) r" r+ �strZunicoder7 r9 Z WeakTypesr: r> r; r@ r r r r �<module> s4 ,