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d� de �Z G dd� de �Z G dd� de �Z G dd� de �Z!dDdd�Z"dEdd�Z#G dd� de$�Z%G dd � d e%�Z&G d d � d e'�Z(dFd d �Z)G d!d"� d"e'�Z*ee*ed#�� ee(ed$�� da+d%d&� Z,d'd(� Z-G d)d*� d*e$�Z.d+d,� Z/i Z0d-d.� Z1G d/d0� d0e2�Z3ee3�G d1d2� d2e$��Z4G d3d4� d4e4�Z5G d5d6� d6e5�Z6G d7d8� d8e5�Z7G d9d:� d:e4�Z8G d;d<� d<e4�Z9dd=l:m;Z; e;d>�d?d@� �Z<e;dA�dBdC� �Z=dS )Ga: This module provides bases for predicates dispatching (the pattern in use
here is similar to what's refered as multi-dispatch or predicate-dispatch in the
literature, though a bit different since the idea is to select across different
implementation 'e.g. classes), not to dispatch a message to a function or
method. It contains the following classes:
* :class:`RegistryStore`, the top level object which loads implementation
objects and stores them into registries. You'll usually use it to access
registries and their contained objects;
* :class:`Registry`, the base class which contains objects semantically grouped
(for instance, sharing a same API, hence the 'implementation' name). You'll
use it to select the proper implementation according to a context. Notice you
may use registries on their own without using the store.
.. Note::
implementation objects are usually designed to be accessed through the
registry and not by direct instantiation, besides to use it as base classe.
The selection procedure is delegated to a selector, which is responsible for
scoring the object according to some context. At the end of the selection, if an
implementation has been found, an instance of this class is returned. A selector
is built from one or more predicates combined together using AND, OR, NOT
operators (actually `&`, `|` and `~`). You'll thus find some base classes to
build predicates:
* :class:`Predicate`, the abstract base predicate class
* :class:`AndPredicate`, :class:`OrPredicate`, :class:`NotPredicate`, which you
shouldn't have to use directly. You'll use `&`, `|` and '~' operators between
predicates directly
* :func:`objectify_predicate`
You'll eventually find one concrete predicate: :class:`yes`
.. autoclass:: RegistryStore
.. autoclass:: Registry
Predicates
----------
.. autoclass:: Predicate
.. autofunc:: objectify_predicate
.. autoclass:: yes
Debugging
---------
.. autoclass:: traced_selection
Exceptions
----------
.. autoclass:: RegistryException
.. autoclass:: RegistryNotFound
.. autoclass:: ObjectNotFound
.. autoclass:: NoSelectableObject
� )�print_functionzrestructuredtext enN)�listdir�stat)�join�isdir�exists)� getLogger)�warn)� string_types�
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classpropertyc @ s e Zd ZdZdS )�RegistryExceptionz"Base class for registry exception.N)�__name__�
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This is usually a programming/typo error.
N)r r r r r r r r r c s r c @ s e Zd ZdZdS )�ObjectNotFoundzvRaised when an unregistered object is requested.
This may be a programming/typo or a misconfiguration error.
N)r r r r r r r r r i s r c @ s e Zd ZdZdd� Zdd� ZdS )�NoSelectableObjectz8Raised when no object is selectable for a given context.c C s || _ || _|| _d S )N)�args�kwargs�objects)�selfr r r r r r �__init__q s zNoSelectableObject.__init__c C s d| j | j�� | jf S )Nz#args: %s, kwargs: %s
candidates: %s)r r �keysr )r r r r �__str__v s zNoSelectableObject.__str__N)r r r r r r r r r r r o s r c C s( t | |�}|d dkr |�� d�|�S )N���r �.)r �popr )�path� extrapathZmodpathr r r �_modname_from_path{ s
r% c s� |dkr t | t�st�i g f}x~| D ]v� t� �rbtt� d��rb� fdd�t� �D �}t|||� q$� dd� dkr$t� |�}� |d |< |d � � |f� q$W |S ) zgReturn a dictionary of <modname>: <modpath> and an ordered list of
(file, module name) to load
Nz __init__.pyc s g | ]}t � |��qS r )r )�.0�fname)� fileordirr r �
<listcomp>� s z _toload_info.<locals>.<listcomp>���z.pyr � )
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isinstance�list�AssertionErrorr r r r � _toload_infor% �append)r# r$ Z_toloadZsubfiles�modnamer )r( r r/ � s
r/ c @ s, e Zd ZdZdZdZdZdZedd� �Z dS )�RegistrableObjecta9 This is the base class for registrable objects which are selected
according to a context.
:attr:`__registry__`
name of the registry for this object (string like 'views',
'templates'...). You may want to define `__registries__` directly if your
object should be registered in several registries.
:attr:`__regid__`
object's identifier in the registry (string like 'main',
'primary', 'folder_box')
:attr:`__select__`
class'selector
Moreover, the `__abstract__` attribute may be set to True to indicate that a
class is abstract and should not be registered.
You don't have to inherit from this class to put it in a registry (having
`__regid__` and `__select__` is enough), though this is needed for classes
that should be automatically registered.
NTc C s | j d krdS | j fS )Nr )� __registry__)�clsr r r �__registries__� s
z RegistrableObject.__registries__)
r r r r r3 � __regid__�
__select__� __abstract__r r5 r r r r r2 � s r2 c s e Zd ZdZ� fdd�Z� ZS )�RegistrableInstancez`Inherit this class if you want instances of the classes to be
automatically registered.
c s2 t t| ��| �}tjdd�d d }t|�|_|S )zzAdd a __module__ attribute telling the module where the instance was
created, for automatic registration.
� )�limitr )�superr9 �__new__�tb�
extract_stackr% r )r4 r r �obj�filepath)� __class__r r r= � s
zRegistrableInstance.__new__)r r r r r= �
__classcell__r r )rB r r9 � s r9 c s� e Zd ZdZ� fdd�Z� fdd�Zedd� �Zedd � �Zd
d � Z d$dd�Z
dd� Z dd� Z dd� Z
dd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Z Z Z Z ZZ� ZS )%�Registrya The registry store a set of implementations associated to identifier:
* to each identifier are associated a list of implementations
* to select an implementation of a given identifier, you should use one of the
:meth:`select` or :meth:`select_or_none` method
* to select a list of implementations for a context, you should use the
:meth:`possible_objects` method
* dictionary like access to an identifier will return the bare list of
implementations for this identifier.
To be usable in a registry, the only requirement is to have a `__select__`
attribute.
At the end of the registration process, the :meth:`__registered__`
method is called on each registered object which have them, given the
registry in which it's registered as argument.
Registration methods:
.. automethod: register
.. automethod: unregister
Selection methods:
.. automethod: select
.. automethod: select_or_none
.. automethod: possible_objects
.. automethod: object_by_id
c s t t| ��� || _d S )N)r< rD r � debugmode)r rE )rB r r r � s zRegistry.__init__c sD yt t| ��|�S tk
r> t|�}t�� d |_|�Y nX dS )z]return the registry (list of implementation objects) associated to
this name
r N)r< rD � __getitem__�KeyErrorr �sys�exc_info�
__traceback__)r �name�exc)rB r r rF � s zRegistry.__getitem__c C s d|j | �|�f S )z@returns a unique identifier for an object stored in the registryz%s.%s)r �objname)r4 r@ r r r �objid s zRegistry.objidc C s t |dt|��S )z<returns a readable name for an object stored in the registryr )�getattr�id)r4 r@ r r r rM s zRegistry.objnamec C sJ x6| � � D ]*}x$|D ] }t|dd�}|r|| � qW q
W | jrFtt� dS )zWcall method __registered__() on registered objects when the callback
is definedZ__registered__N)�valuesrO rE �wrap_predicates�_lltrace)r r � objectcls�
registeredr r r �initialization_completed
s
z!Registry.initialization_completedNFc C sz d|j kst|��|js t|��|p(|j}|s:td| ��|rLg }| |< n | �|g �}||ksltd| ��|�|� dS )z,base method to add an object in the registryr8 zKno explicit name supplied to register object %s, which has no __regid__ setz object %s is already registeredN)�__dict__r. r7 r6 �
setdefaultr0 )r r@ �oid�clearr r r r �register s
zRegistry.registerc C s~ t |t�s| �|�}||k s(td| ��| �|jd�}x8t|�D ] \}}| �|�|kr@||= P q@W | �d||� | �|� dS )z$remove <replaced> and register <obj>z!replacing an object by itself: %sr z3trying to replace %s that is not registered with %sN) r, r
rN r. �getr6 � enumerate�warningr[ )r r@ �replacedZregistered_objs�indexrU r r r �register_and_replace& s
z Registry.register_and_replacec C sV | � |�}|j}x@| �|d�D ]"}| � |�|kr | | �|� P q W | �d||� dS )z&remove object <obj> from this registryr z)can't remove %s, no id %s in the registryN)rN r6 r\ �remover^ )r r@ rN rY rU r r r �
unregister9 s
zRegistry.unregisterc C s" g }x| � � D ] }||7 }qW |S )z?return a list containing all objects in this registry.
)rQ )r �resultZobjsr r r � all_objectsG s zRegistry.all_objectsc O s* | | }t |�dks t|��|d ||�S )a return object with the `oid` identifier. Only one object is expected
to be found.
raise :exc:`ObjectNotFound` if there are no object with id `oid` in this
registry
raise :exc:`AssertionError` if there is more than one object there
r+ r )�lenr. )r rY r r r r r r � object_by_idQ s zRegistry.object_by_idc O s2 | j | | f|�|�}|dkr.t||| | ��|S )a return the most specific object among those with the given oid
according to the given context.
raise :exc:`ObjectNotFound` if there are no object with id `oid` in this
registry
raise :exc:`NoSelectableObject` if no object can be selected
N)� _select_bestr )r �_Registry__oidr r r@ r r r �select^ s zRegistry.selectc O s0 y| j | | f|�|�S tk
r* dS X dS )z�return the most specific object among those with the given oid
according to the given context, or None if no object applies.
N)rh r )r ri r r r r r �select_or_nonel s zRegistry.select_or_nonec o s8 x2| � � D ]&}| j|f|�|�}|dkr*q
|V q
W dS )z^return an iterator on possible objects in this registry for the given
context
N)rQ rh )r r r r r@ r r r �possible_objectsu s
zRegistry.possible_objectsc O s� d\}}xN|D ]F}|j |f|�|�}||kr:||g }}q|dkr||kr|�|� qW |dkrddS t|�dkr�d}| jr�t||||�� f ��| �||||�� � | �|d ||�S )a return an instance of the most specific object according
to parameters
return None if not object apply (don't raise `NoSelectableObject` since
it's costly when searching objects using `possible_objects`
(e.g. searching for hooks).
)r Nr Nr+ z+select ambiguity: %s
(args: %s, kwargs: %s))r7 r0 rf rE � Exceptionr �error�selected) r r r r �scoreZwinnersr@ Z objectscore�msgr r r rh s
zRegistry._select_bestc C s
|||�S )zEoverride here if for instance you don't want "instanciation"
r )r �winnerr r r r r ro � s zRegistry.selectedc O s d S )Nr )rq �a�kwr r r �<lambda>� � zRegistry.<lambda>)NF)r r r r r rF � classmethodrN rM rV r[ ra rc re rg rj rk rl rh ro �infor^ rn �critical� exception�debugrC r r )rB r rD � s"
rD c C s |r
|fS | j S )z5return a tuple of registry names (see __registries__))r5 )r4 � registrynamer r r �obj_registries� s r} c s� e Zd ZdZd+� fdd� Zdd� Z� fdd�Zd eiZd
d � Z d d
� Z
d,dd�Z d-dd�Z d.dd�Z
d/dd�Zd0dd�Zd1dd�Zdd � Zd d � Zd d � Zd!d"� Zd#d$� Zd2d%d&�Zed'd(� �Zd)d*� Z Z Z Z Z Z � Z S )3�
RegistryStoreah This class is responsible for loading objects and storing them
in their registry which is created on the fly as needed.
It handles dynamic registration of objects and provides a
convenient api to access them. To be recognized as an object that
should be stored into one of the store's registry
(:class:`Registry`), an object must provide the following
attributes, used control how they interact with the registry:
:attr:`__registries__`
list of registry names (string like 'views', 'templates'...) into which
the object should be registered
:attr:`__regid__`
object identifier in the registry (string like 'main',
'primary', 'folder_box')
:attr:`__select__`
the object predicate selectors
Moreover, the :attr:`__abstract__` attribute may be set to `True`
to indicate that an object is abstract and should not be registered
(such inherited attributes not considered).
.. Note::
When using the store to load objects dynamically, you *always* have
to use **super()** to get the methods and attributes of the
superclasses, and not use the class identifier. If not, you'll get into
trouble at reload time.
For example, instead of writing::
class Thing(Parent):
__regid__ = 'athing'
__select__ = yes()
def f(self, arg1):
Parent.f(self, arg1)
You must write::
class Thing(Parent):
__regid__ = 'athing'
__select__ = yes()
def f(self, arg1):
super(Thing, self).f(arg1)
Controlling object registration
-------------------------------
Dynamic loading is triggered by calling the
:meth:`register_objects` method, given a list of directories to
inspect for python modules.
.. automethod: register_objects
For each module, by default, all compatible objects are registered
automatically. However if some objects come as replacement of
other objects, or have to be included only if some condition is
met, you'll have to define a `registration_callback(vreg)`
function in the module and explicitly register **all objects** in
this module, using the api defined below.
.. automethod:: RegistryStore.register_all
.. automethod:: RegistryStore.register_and_replace
.. automethod:: RegistryStore.register
.. automethod:: RegistryStore.unregister
.. Note::
Once the function `registration_callback(vreg)` is implemented in a
module, all the objects from this module have to be explicitly
registered as it disables the automatic object registration.
Examples:
.. sourcecode:: python
def registration_callback(store):
# register everything in the module except BabarClass
store.register_all(globals().values(), __name__, (BabarClass,))
# conditionally register BabarClass
if 'babar_relation' in store.schema:
store.register(BabarClass)
In this example, we register all application object classes defined in the module
except `BabarClass`. This class is then registered only if the 'babar_relation'
relation type is defined in the instance schema.
.. sourcecode:: python
def registration_callback(store):
store.register(Elephant)
# replace Babar by Celeste
store.register_and_replace(Celeste, Babar)
In this example, we explicitly register classes one by one:
* the `Elephant` class
* the `Celeste` to replace `Babar`
If at some point we register a new appobject class in this module, it won't be
registered at all without modification to the `registration_callback`
implementation. The first example will register it though, thanks to the call
to the `register_all` method.
Controlling registry instantiation
----------------------------------
The `REGISTRY_FACTORY` class dictionary allows to specify which class should
be instantiated for a given registry name. The class associated to `None`
key will be the class used when there is no specific class for a name.
Fc s t t| ��� || _d S )N)r< r~ r rE )r rE )rB r r r " s zRegistryStore.__init__c C s$ x| � � D ] }|�� q
W i | _dS )z*clear all registries managed by this storeN)rQ rZ � _lastmodifs)r Zsubdictr r r �reset& s zRegistryStore.resetc sD yt t| ��|�S tk
r> t|�}t�� d |_|�Y nX dS )zZreturn the registry (dictionary of class objects) associated to
this name
r N)r< r~ rF rG r rH rI rJ )r rK rL )rB r r rF - s zRegistryStore.__getitem__Nc C s* y
| j | S tk
r$ | j d S X dS )zWreturn existing registry named regid or use factory to create one and
return itN)�REGISTRY_FACTORYrG )r �regidr r r �registry_class= s
z RegistryStore.registry_classc C s: y| | S t k
r4 | �|�| j�| |< | | S X d S )N)r r� rE )r r� r r r rX E s
zRegistryStore.setdefaultr c C sh t |t�std| ��xL|D ]D}| �|�r |j|kr ||kr t |t�rV| �|||� q | �|� q W dS )a~ register registrable objects into `objects`.
Registrable objects are properly configured subclasses of
:class:`RegistrableObject`. Objects which are not defined in the module
`modname` or which are in `butclasses` won't be registered.
Typical usage is:
.. sourcecode:: python
store.register_all(globals().values(), __name__, (ClassIWantToRegisterExplicitly,))
So you get partially automatic registration, keeping manual registration
for some object (to use
:meth:`~logilab.common.registry.RegistryStore.register_and_replace` for
instance).
z8modname expected to be a module name (ie string), got %rN)r, r
r. �is_registrabler �type�_load_ancestors_then_objectr[ )r r r1 �
butclassesr@ r r r � register_allL s
zRegistryStore.register_allc C s| |j �d�rt|��xbt||�D ]T}| �|�}|j|||d� | �d|�|�||pV|j� || j �|j
i �|� |�< q W dS )a register `obj` implementation into `registryname` or
`obj.__registries__` if not specified, with identifier `oid` or
`obj.__regid__` if not specified.
If `clear` is true, all objects with the same identifier will be
previously unregistered.
r8 )rY rZ zregister %s in %s['%s']N) rW r\ r. r} rX r[ r{ rM r6 � _loadedmodsr rN )r r@ r| rY rZ �registryr r r r[ g s
zRegistryStore.registerc C sB x<t ||�D ].}| | }|�|� | �d|�|�||j� q W dS )zsunregister `obj` object from the registry `registryname` or
`obj.__registries__` if not specified.
zunregister %s from %s['%s']N)r} rc r{ rM r6 )r r@ r| r� r r r rc w s
zRegistryStore.unregisterc
C sL xFt ||�D ]8}| | }|�||� | �d|�|�||j|�|�� q W dS )z�register `obj` object into `registryname` or
`obj.__registries__` if not specified. If found, the `replaced` object
will be unregistered first (else a warning will be issued as it is
generally unexpected).
z%register %s in %s['%s'] instead of %sN)r} ra r{ rM r6 )r r@ r_ r| r� r r r ra � s z"RegistryStore.register_and_replacec C s" | � � t||�\| _}i | _|S )zbreset registry and walk down path to return list of (path, name)
file modules to be loaded)r� r/ � _toloadmodsr� )r r# r$ �filemodsr r r �init_registration� s z RegistryStore.init_registrationc C s6 | � ||�}x |D ]\}}| �||� qW | �� dS )z.register all objects found walking down <path>N)r� � load_filerV )r r# r$ r� rA r1 r r r �register_objects� s z RegistryStore.register_objectsc C s x| � � D ] }|�� q
W dS )z7call initialization_completed() on all known registriesN)rQ rV )r �regr r r rV � s z&RegistryStore.initialization_completedc C s2 y t |�d S tk
r, | �d|� dS X dS )z- return the modification date of a file path ���z3Unable to load %s. It is likely to be a backup fileN)r �OSErrorr^ )r rA r r r �_mdate� s zRegistryStore._mdatec s� | j }x�|D ]�� t� �rHtt� d��rH| �� fdd�t� �D ��r�dS q � dd� dkr | �� �}|dkrnq n
d� krxq � |ks�|� |k r | �d � � dS q W d
S ) z\return True if something module changed and the registry should be
reloaded
z __init__.pyc s g | ]}t � |��qS r )r )r& r' )r( r r r) � s z2RegistryStore.is_reload_needed.<locals>.<listcomp>Tr* Nz.py�flymakez File %s changed since last visitF)r r r r �is_reload_neededr r� rx )r r# Z
lastmodifs�mdater )r( r r� � s
z RegistryStore.is_reload_neededc C sf ddl m} || jkrdS i | j|< | �|�}|dkr:dS d|krFdS || j|< ||�}| �|� dS )z6 load registrable objects (if any) from a python file r )�load_module_from_nameNr� )�logilab.common.modutilsr� r� r� r � load_module)r rA r1 r� r� �moduler r r r� � s
zRegistryStore.load_filec C sB | � d|j|j� t|d�r(|�| � n| �t|��� |j� dS )a\ Automatically handle module objects registration.
Instances are registered as soon as they are hashable and have the
following attributes:
* __regid__ (a string)
* __select__ (a callable)
* __registries__ (a tuple/list of string)
For classes this is a bit more complicated :
- first ensure parent classes are already registered
- class with __abstract__ == True in their local dictionary are skipped
- object class needs to have registries and identifier properly set to a
non empty string to be registered.
zloading %s from %s�registration_callbackN)rx r �__file__�hasattrr� r� �varsrQ )r r� r r r r� � s
zRegistryStore.load_modulec C s t |t�s,| �|�r(|j|kr(| �|� dS |j}||krZ|| jkrV| �| j| |� dS d||jf }|| j| krzdS || j| |< x |j D ]}| �
|||� q�W ||ks�| �|�s�dS | � t |�d �}|�
|�d dkr�td| t� dS | �|� dS )z\handle class registration according to rules defined in
:meth:`load_module`
Nz%s.%sr �_zx[lgc 0.59] object whose name start with '_' won't be skipped anymore at some point, use __abstract__ = True instead (%s))r, r� r� r r[ r� r� r r� � __bases__r� rX r} rM r �DeprecationWarning)r r1 rT r� Z
objmodnameZclsid�parentr� r r r r� � s.
z)RegistryStore._load_ancestors_then_objectc C s� t |t�rNt|t�s>t|dd�r8t|dd�r8t|dd�sLdS q\t|t�r\dS nt |t�s\dS |jsfdS |j}|stdS |j}|s�dS |j �
dd�r�dS t |t t f�s�| �
d|� dS t|�s�| �
d|� dS d S )
z�ensure `obj` should be registered
as arbitrary stuff may be registered, do a lot of check and warn about
weird cases (think to dumb proxy objects)
r5 Nr6 r7 Fr8 z2%s has __registries__ which is not a list or tuplez %s has not callable __select__T)r, r� �
issubclassr2 rO r9 r6 r5 r7 rW r\ �tupler- r^ �callable)r4 r@ Z
registries�selectorr r r r� ! s6
z RegistryStore.is_registrablec O s d S )Nr )rq rs rt r r r ru H rv zRegistryStore.<lambda>)F)r )NNF)N)N)N)N)r ) r r r r r r� rF rD r� r� rX r� r[ rc ra r� r� rV r� r� r� r� r� rw r� rx r^ rn ry rz r{ rC r r )rB r r~ � s* u
) 'r~ zregistry.storer� c C s4 |d }t dks|jt kr0td| |||jf � d S )Nr �allz%s -> %s for %s(%s))� TRACED_OIDSr6 �print)r4 r� r �retZvobjr r r �_trace_selectorS s r� c s � fdd�}� j |_ � j|_|S )zfuse this decorator on your predicates so they become traceable with
:class:`traced_selection`
c s* � | f|�|�}t d k r&t| � ||� |S )N)r� r� )r4 r r r� )r� r r �traced\ s z_lltrace.<locals>.traced)r r )r� r� r )r� r rS X s rS c @ s* e Zd ZdZd
dd�Zdd� Zdd� Zd S ) �traced_selectiona
Typical usage is :
.. sourcecode:: python
>>> from logilab.common.registry import traced_selection
>>> with traced_selection():
... # some code in which you want to debug selectors
... # for all objects
This will yield lines like this in the logs::
selector one_line_rset returned 0 for <class 'elephant.Babar'>
You can also give to :class:`traced_selection` the identifiers of objects on
which you want to debug selection ('oid1' and 'oid2' in the example above).
.. sourcecode:: python
>>> with traced_selection( ('regid1', 'regid2') ):
... # some code in which you want to debug selectors
... # for objects with __regid__ 'regid1' and 'regid2'
A potentially useful point to set up such a tracing function is
the `logilab.common.registry.Registry.select` method body.
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r� c s t � jtf� j� fdd�d��S )aX Most of the time, a simple score function is enough to build a selector.
The :func:`objectify_predicate` decorator turn it into a proper selector
class::
@objectify_predicate
def one(cls, req, rset=None, **kwargs):
return 1
class MyView(View):
__select__ = View.__select__ & one()
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rR c @ s e Zd Zdd� ZdS )�PredicateMetaClassc O s2 t j| f|�|�}t�|dd� �}|tt|�< |S )Nc S s t �t| ��S )N)r� r" rP )�pr r r ru � rv z,PredicateMetaClass.__new__.<locals>.<lambda>)r� r= �weakref�proxyr� rP )Zmcsr r �instr� r r r r= � s zPredicateMetaClass.__new__N)r r r r= r r r r r� � s r� c @ st e Zd ZdZedd� �Zdd� Zdd� Zdd � Zd
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dd� Z dd� Z dd� Z
dd� Zdd� Zdd� ZdS )r� a� base class for selector classes providing implementation
for operators ``&``, ``|`` and ``~``
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logic itself should be implemented in the :meth:`__call__` method. Notice it
should usually accept any arbitrary arguments (the context), though that may
vary depending on your usage of the registry.
a selector is called to help choosing the correct object for a
particular context by returning a score (`int`) telling how well
the implementation given as first argument fit to the given context.
0 score means that the class doesn't apply.
c C s | j jS )N)rB r )r r r r � func_name� s zPredicate.func_namec C s2 | |kr | S t |t�s t |t�r.t | |�r.| S dS )z�search for the given selector, selector instance or tuple of
selectors in the selectors tree. Return None if not found.
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zPredicate.search_selectorc C s | j jS )N)rB r )r r r r r � s zPredicate.__str__c C s
t | |�S )N)� AndPredicate)r �otherr r r �__and__� s zPredicate.__and__c C s
t || �S )N)r� )r r� r r r �__rand__� s zPredicate.__rand__c C s
t | |�S )N)r� )r r� r r r �__iand__� s zPredicate.__iand__c C s
t | |�S )N)� OrPredicate)r r� r r r �__or__� s zPredicate.__or__c C s
t || �S )N)r� )r r� r r r �__ror__� s zPredicate.__ror__c C s
t | |�S )N)r� )r r� r r r �__ior__� s zPredicate.__ior__c C s t | �S )N)� NotPredicate)r r r r �
__invert__� s zPredicate.__invert__c O s t d| j �S )Nz;selector %s must implement its logic in its __call__ method)�NotImplementedErrorrB )r r4 r r r r r r� � s zPredicate.__call__c C s d| j jt| �f S )Nz<Predicate %s at %x>)rB r rP )r r r r �__repr__� s zPredicate.__repr__N)r r r r �propertyr� r� r r� r� r� r� r� r� r� r� r� r r r r r� � s r� c s< e Zd ZdZdd� Zdd� Zedd� �Z� fdd �Z� Z S )
�MultiPredicatez(base class for compound selector classesc G s | � |�| _d S )N)�merge_selectors� selectors)r r� r r r r � s zMultiPredicate.__init__c C s" d| j jd�dd� | jD ��f S )Nz%s(%s)�,c s s | ]}t |�V qd S )N)�str)r& �sr r r � <genexpr>� s z)MultiPredicate.__str__.<locals>.<genexpr>)rB r r r� )r r r r r � s zMultiPredicate.__str__c C sx g }xn|D ]f}t |tj�r$t|�� }t |t�r>t|t�r>|� }t |t�sPt|��t || �rf||j7 }q
|� |� q
W |S )z�deal with selector instanciation when necessary and merge
multi-selectors if possible:
AndPredicate(AndPredicate(sel1, sel2), AndPredicate(sel3, sel4))
==> AndPredicate(sel1, sel2, sel3, sel4)
)
r, �types� FunctionTyper� r� r� r� r. r� r0 )r4 r� Zmerged_selectorsr� r r r r� � s
z MultiPredicate.merge_selectorsc sB x0| j D ]&}||kr|S |�|�}|dk r|S qW tt| ��|�S )z�search for the given selector or selector instance (or tuple of
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childselector�found)rB r r r� s
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r r r r r r rw r� r� rC r r )rB r r� � s
r� c @ s e Zd ZdZdd� ZdS )r� zand-chained selectorsc O s8 d}x.| j D ]$}||f|�|�}|s(dS ||7 }q W |S )Nr )r� )r r4 r r rp r� � partscorer r r r� $ s zAndPredicate.__call__N)r r r r r� r r r r r� " s r� c @ s e Zd ZdZdd� ZdS )r� zor-chained selectorsc O s, x&| j D ] }||f|�|�}|r|S qW dS )Nr )r� )r r4 r r r� r� r r r r� 0 s
zOrPredicate.__call__N)r r r r r� r r r r r� . s r� c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) r� znegation selectorc C s
|| _ d S )N)r� )r r� r r r r 9 s zNotPredicate.__init__c O s | j |f|�|�}t| �S )N)r� �int)r r4 r r rp r r r r� < s zNotPredicate.__call__c C s
d| j S )NzNOT(%s))r� )r r r r r @ s zNotPredicate.__str__N)r r r r r r� r r r r r r� 7 s r� c @ s" e Zd ZdZddd�Zdd� ZdS ) �yesa$ Return the score given as parameter, with a default score of 0.5 so any
other selector take precedence.
Usually used for objects which can be selected whatever the context, or
also sometimes to add arbitrary points to a score.
Take care, `yes(0)` could be named 'no'...
� �?c C s
|| _ d S )N)rp )r rp r r r r M s z yes.__init__c O s | j S )N)rp )r r r r r r r� P s z yes.__call__N)r� )r r r r r r� r r r r r� D s
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