vregistry.py
author logilab@eusebius.local
Tue, 17 Feb 2009 17:30:47 +0100
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"""
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* the vregistry handle various type of objects interacting
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  together. The vregistry handle registration of dynamically loaded
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  objects and provide a convenient api access to those objects
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  according to a context
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* to interact with the vregistry, object should inherit from the
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  VObject abstract class
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* the registration procedure is delegated to a registerer. Each
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  registerable vobject must defines its registerer class using the
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  __registerer__ attribute.  A registerer is instantianted at
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  registration time after what the instance is lost
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* the selection procedure has been generalized by delegating to a
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  selector, which is responsible to score the vobject according to the
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  current state (req, rset, row, col). At the end of the selection, if
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  a vobject class has been found, an instance of this class is
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  returned. The selector is instantiated at vobject registration
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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import sys
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from os import listdir, stat
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from os.path import dirname, join, realpath, split, isdir
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from logging import getLogger
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from cubicweb import CW_SOFTWARE_ROOT, set_log_methods
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from cubicweb import RegistryNotFound, ObjectNotFound, NoSelectableObject
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class vobject_helper(object):
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    """object instantiated at registration time to help a wrapped
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    VObject subclass
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    """
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    def __init__(self, registry, vobject):
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        self.registry = registry
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        self.vobject = vobject
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        self.config = registry.config
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        self.schema = registry.schema
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class registerer(vobject_helper):
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    """do whatever is needed at registration time for the wrapped
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    class, according to current application schema and already
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    registered objects of the same kind (i.e. same registry name and
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    same id).
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    The wrapped class may be skipped, some previously selected object
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    may be kicked out... After whatever works needed, if the object or
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    a transformed object is returned, it will be added to previously
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    registered objects.
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    """
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    def __init__(self, registry, vobject):
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        super(registerer, self).__init__(registry, vobject)
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        self.kicked = set()
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    def do_it_yourself(self, registered):
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        raise NotImplementedError(str(self.vobject))
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    def kick(self, registered, kicked):
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        self.debug('kicking vobject %s', kicked)
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        registered.remove(kicked)
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        self.kicked.add(kicked.classid())
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    def skip(self):
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        self.debug('no schema compat, skipping %s', self.vobject)
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def selector(cls, *args, **kwargs):
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    """selector is called to help choosing the correct object for a
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    particular request and result set by returning a score.
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    it must implement a .score_method taking a request, a result set and
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    optionaly row and col arguments which return an int telling how well
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    the wrapped class apply to the given request and result set. 0 score
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    means that it doesn't apply.
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    rset may be None. If not, row and col arguments may be optionally
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    given if the registry is scoring a given row or a given cell of
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    the result set (both row and col are int if provided).
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    """    
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    raise NotImplementedError(cls)
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class autoselectors(type):
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    """implements __selectors__ / __select__ compatibility layer so that:
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    __select__ = chainall(classmethod(A, B, C))
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    can be replaced by something like:
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    __selectors__ = (A, B, C)
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    """
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    def __new__(mcs, name, bases, classdict):
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        if '__select__' in classdict and '__selectors__' in classdict:
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            raise TypeError("__select__ and __selectors__ "
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                            "can't be used together")
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        if '__select__' not in classdict and '__selectors__' in classdict:
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            selectors = classdict['__selectors__']
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            if len(selectors) > 1:
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                classdict['__select__'] = classmethod(chainall(*selectors))
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            else:
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                classdict['__select__'] = classmethod(selectors[0])
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        return super(autoselectors, mcs).__new__(mcs, name, bases, classdict)
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    def __setattr__(self, attr, value):
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        if attr == '__selectors__':
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            self.__select__ = classmethod(chainall(*value))
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        super(autoselectors, self).__setattr__(attr, value)
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class VObject(object):
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    """visual object, use to be handled somehow by the visual components
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    registry.
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    The following attributes should be set on concret vobject subclasses:
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    :__registry__:
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      name of the registry for this object (string like 'views',
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      'templates'...)
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    :id:
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      object's identifier in the registry (string like 'main',
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      'primary', 'folder_box')
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    :__registerer__:
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      registration helper class
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    :__select__:
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      selection helper function
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    :__selectors__:
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      tuple of selectors to be chained
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      (__select__ and __selectors__ are mutually exclusive)
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    Moreover, the `__abstract__` attribute may be set to True to indicate
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    that a vobject is abstract and should not be registered
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    """
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    __metaclass__ = autoselectors
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    # necessary attributes to interact with the registry
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    id = None
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    __registry__ = None
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    __registerer__ = None
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    __select__ = None
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    @classmethod
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    def registered(cls, registry):
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        """called by the registry when the vobject has been registered.
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        It must return the  object that will be actually registered (this
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        may be the right hook to create an instance for example). By
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        default the vobject is returned without any transformation.
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        """
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        return cls
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    @classmethod
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    def selected(cls, *args, **kwargs):
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        """called by the registry when the vobject has been selected.
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        It must return the  object that will be actually returned by the
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        .select method (this may be the right hook to create an
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        instance for example). By default the selected object is
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        returned without any transformation.
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        """
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        return cls
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    @classmethod
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    def classid(cls):
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        """returns a unique identifier for the vobject"""
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        return '%s.%s' % (cls.__module__, cls.__name__)
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class VRegistry(object):
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    """class responsible to register, propose and select the various
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    elements used to build the web interface. Currently, we have templates,
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    views, actions and components.
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    """
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    def __init__(self, config):#, cache_size=1000):
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        self.config = config
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        # dictionnary of registry (themself dictionnary) by name
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        self._registries = {}
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        self._lastmodifs = {}
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    def reset(self):
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        self._registries = {}
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        self._lastmodifs = {}
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    def __getitem__(self, key):
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        return self._registries[key]
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    def get(self, key, default=None):
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        return self._registries.get(key, default)
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    def items(self):
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        return self._registries.items()
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    def values(self):
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        return self._registries.values()
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   204
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    def __contains__(self, key):
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        return key in self._registries
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   207
0
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   208
    def registry(self, name):
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        """return the registry (dictionary of class objects) associated to
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        this name
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   211
        """
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   212
        try:
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   213
            return self._registries[name]
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   214
        except KeyError:
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   215
            raise RegistryNotFound(name), None, sys.exc_info()[-1]
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   216
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    def registry_objects(self, name, oid=None):
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        """returns objects registered with the given oid in the given registry.
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   219
        If no oid is given, return all objects in this registry
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   220
        """
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   221
        registry = self.registry(name)
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   222
        if oid:
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   223
            try:
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   224
                return registry[oid]
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   225
            except KeyError:
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   226
                raise ObjectNotFound(oid), None, sys.exc_info()[-1]
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   227
        else:
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   228
            result = []
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   229
            for objs in registry.values():
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                result += objs
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   231
            return result
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   232
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   233
    def object_by_id(self, registry, cid, *args, **kwargs):
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   234
        """return the most specific component according to the resultset"""
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   235
        objects = self[registry][cid]
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   236
        assert len(objects) == 1, objects
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   237
        return objects[0].selected(*args, **kwargs)
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   238
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   239
    # methods for explicit (un)registration ###################################
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   240
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   241
#     def clear(self, key):
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   242
#         regname, oid = key.split('.')
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   243
#         self[regname].pop(oid, None)
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   244
        
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   245
    def register(self, obj, registryname=None, oid=None, clear=False):
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   246
        """base method to add an object in the registry"""
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   247
        registryname = registryname or obj.__registry__
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   248
        oid = oid or obj.id
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diff changeset
   249
        registry = self._registries.setdefault(registryname, {})
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   250
        if clear:
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   251
            vobjects = registry[oid] =  []
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   252
        else:
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   253
            vobjects = registry.setdefault(oid, [])
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   254
        # registered() is technically a classmethod but is not declared
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   255
        # as such because we need to compose registered in some cases
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   256
        vobject = obj.registered.im_func(cls, self)
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   257
        assert not vobject in vobjects
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   258
        vobjects.append(vobject)
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   259
        try:
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   260
            vname = vobject.__name__
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diff changeset
   261
        except AttributeError:
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   262
            vname = vobject.__class__.__name__
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diff changeset
   263
        self.debug('registered vobject %s in registry %s with id %s',
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diff changeset
   264
                   vname, registryname, oid)
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diff changeset
   265
        # automatic reloading management
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diff changeset
   266
        self._registered['%s.%s' % (obj.__module__, oid)] = obj
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diff changeset
   267
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   268
    def unregister(self, obj, registryname=None):
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diff changeset
   269
        registryname = registryname or obj.__registry__
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diff changeset
   270
        registry = self.registry(registryname)
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   271
        removed_id = obj.classid()
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   272
        for registered in registry[obj.id]:
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   273
            # use classid() to compare classes because vreg will probably
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   274
            # have its own version of the class, loaded through execfile
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   275
            if registered.classid() == removed_id:
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   276
                # XXX automatic reloading management
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   277
                try:
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   278
                    registry[obj.id].remove(registered)
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   279
                except ValueError:
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   280
                    self.warning('can\'t remove %s, no id %s in the %s registry',
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   281
                                 removed_id, obj.id, registryname)
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   282
                except ValueError:
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   283
                    self.warning('can\'t remove %s, not in the %s registry with id %s',
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   284
                                 removed_id, registryname, obj.id)
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   285
#                 else:
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   286
#                     # if objects is empty, remove oid from registry
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   287
#                     if not registry[obj.id]:
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   288
#                         del regcontent[oid]                    
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   289
                break
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   290
    
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   291
    def register_and_replace(self, obj, replaced, registryname=None):
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   292
        registryname = registryname or obj.__registry__
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   293
        registry = self.registry(registryname)
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   294
        registered_objs = registry[obj.id]
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   295
        for index, registered in enumerate(registered_objs):
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   296
            if registered.classid() == replaced:
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   297
                registry[obj.id][index] = obj
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   298
                self._registered['%s.%s' % (obj.__module__, obj.id)] = obj                
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   299
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   300
    # dynamic selection methods ###############################################
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   301
    
0
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   302
    def select(self, vobjects, *args, **kwargs):
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        """return an instance of the most specific object according
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   304
        to parameters
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   305
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   306
        raise NoSelectableObject if not object apply
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   307
        """
177
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diff changeset
   308
        score, winners = 0, []
0
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   309
        for vobject in vobjects:
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   310
            vobjectscore = vobject.__select__(*args, **kwargs)
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   311
            if vobjectscore > score:
177
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diff changeset
   312
                score, winners = vobjectscore, [vobject]
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diff changeset
   313
            elif vobjectscore > 0 and vobjectscore == score:
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diff changeset
   314
                winners.append(vobject)
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diff changeset
   315
        if not winners:
0
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diff changeset
   316
            raise NoSelectableObject('args: %s\nkwargs: %s %s'
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diff changeset
   317
                                     % (args, kwargs.keys(), [repr(v) for v in vobjects]))
177
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diff changeset
   318
        if len(winners) > 1:
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parents: 0
diff changeset
   319
            if self.config.mode == 'installed':
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parents: 0
diff changeset
   320
                self.error('select ambiguity, args: %s\nkwargs: %s %s',
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parents: 0
diff changeset
   321
                           args, kwargs.keys(), [repr(v) for v in winners])
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parents: 0
diff changeset
   322
            else:
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diff changeset
   323
                raise Exception('select ambiguity, args: %s\nkwargs: %s %s'
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diff changeset
   324
                                % (args, kwargs.keys(), [repr(v) for v in winners]))
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diff changeset
   325
        winner = winners[0]
0
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diff changeset
   326
        # return the result of the .selected method of the vobject
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diff changeset
   327
        return winner.selected(*args, **kwargs)
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diff changeset
   328
    
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diff changeset
   329
    def possible_objects(self, registry, *args, **kwargs):
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diff changeset
   330
        """return an iterator on possible objects in a registry for this result set
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diff changeset
   331
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   332
        actions returned are classes, not instances
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diff changeset
   333
        """
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diff changeset
   334
        for vobjects in self.registry(registry).values():
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diff changeset
   335
            try:
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diff changeset
   336
                yield self.select(vobjects, *args, **kwargs)
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diff changeset
   337
            except NoSelectableObject:
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diff changeset
   338
                continue
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diff changeset
   339
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diff changeset
   340
    def select_object(self, registry, cid, *args, **kwargs):
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diff changeset
   341
        """return the most specific component according to the resultset"""
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diff changeset
   342
        return self.select(self.registry_objects(registry, cid), *args, **kwargs)
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diff changeset
   343
    
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diff changeset
   344
    # intialization methods ###################################################
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diff changeset
   345
    
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diff changeset
   346
    def register_objects(self, path, force_reload=None):
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diff changeset
   347
        if force_reload is None:
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diff changeset
   348
            force_reload = self.config.mode == 'dev'
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parents:
diff changeset
   349
        elif not force_reload:
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diff changeset
   350
            # force_reload == False usually mean modules have been reloaded
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diff changeset
   351
            # by another connection, so we want to update the registry
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diff changeset
   352
            # content even if there has been no module content modification
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diff changeset
   353
            self.reset()
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diff changeset
   354
        # need to clean sys.path this to avoid import confusion pb (i.e.
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diff changeset
   355
        # having the same module loaded as 'cubicweb.web.views' subpackage and
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parents:
diff changeset
   356
        # as views'  or 'web.views' subpackage
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parents:
diff changeset
   357
        # this is mainly for testing purpose, we should'nt need this in
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diff changeset
   358
        # production environment
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diff changeset
   359
        for webdir in (join(dirname(realpath(__file__)), 'web'),
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
                       join(dirname(__file__), 'web')):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   361
            if webdir in sys.path:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   362
                sys.path.remove(webdir)
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parents:
diff changeset
   363
        if CW_SOFTWARE_ROOT in sys.path:
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parents:
diff changeset
   364
            sys.path.remove(CW_SOFTWARE_ROOT)        
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
        # load views from each directory in the application's path
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
        change = False
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parents:
diff changeset
   367
        for fileordirectory in path:
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diff changeset
   368
            if isdir(fileordirectory):
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parents:
diff changeset
   369
                if self.read_directory(fileordirectory, force_reload):
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parents:
diff changeset
   370
                    change = True
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parents:
diff changeset
   371
            else:
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parents:
diff changeset
   372
                directory, filename = split(fileordirectory)
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parents:
diff changeset
   373
                if self.load_file(directory, filename, force_reload):
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parents:
diff changeset
   374
                    change = True
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parents:
diff changeset
   375
        if change:
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parents:
diff changeset
   376
            for registry, objects in self.items():
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parents:
diff changeset
   377
                self.debug('available in registry %s: %s', registry,
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parents:
diff changeset
   378
                           sorted(objects))
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parents:
diff changeset
   379
        return change
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parents:
diff changeset
   380
    
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parents:
diff changeset
   381
    def read_directory(self, directory, force_reload=False):
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diff changeset
   382
        """read a directory and register available views"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
        modified_on = stat(realpath(directory))[-2]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
        # only read directory if it was modified
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
        _lastmodifs = self._lastmodifs
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
        if directory in _lastmodifs and modified_on <= _lastmodifs[directory]:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
            return False
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
        self.info('loading directory %s', directory)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
        for filename in listdir(directory):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
            if filename[-3:] == '.py':
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
                try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
                    self.load_file(directory, filename, force_reload)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
                except OSError:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
                    # this typically happens on emacs backup files (.#foo.py)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   395
                    self.warning('Unable to load file %s. It is likely to be a backup file',
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
                                 filename)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
                except Exception, ex:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
                    if self.config.mode in ('dev', 'test'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
                        raise
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
                    self.exception('%r while loading file %s', ex, filename)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
        _lastmodifs[directory] = modified_on
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
        return True
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
    def load_file(self, directory, filename, force_reload=False):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
        """load visual objects from a python file"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
        from logilab.common.modutils import load_module_from_modpath, modpath_from_file
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
        filepath = join(directory, filename)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
        modified_on = stat(filepath)[-2]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
        modpath = modpath_from_file(join(directory, filename))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
        modname = '.'.join(modpath)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
        unregistered = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
        _lastmodifs = self._lastmodifs
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
        if filepath in _lastmodifs:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
            # only load file if it was modified
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
            if modified_on <= _lastmodifs[filepath]:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
                return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
                # if it was modified, unregister all exisiting objects
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
                # from this module, and keep track of what was unregistered
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
                unregistered = self.unregister_module_vobjects(modname)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
        # load the module
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
        module = load_module_from_modpath(modpath, use_sys=not force_reload)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
        registered = self.load_module(module)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
        # if something was unregistered, we need to update places where it was
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
        # referenced 
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
        if unregistered:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
            # oldnew_mapping = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
            oldnew_mapping = dict((unregistered[name], registered[name])
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
                                  for name in unregistered if name in registered)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
            self.update_registered_subclasses(oldnew_mapping)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
        _lastmodifs[filepath] = modified_on
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
        return True
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
    def load_module(self, module):
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   435
        self._registered = {}
668
61b2328f9ed9 rename registration callback, clear argument to register
sylvain.thenault@logilab.fr
parents: 665
diff changeset
   436
        if hasattr(module, 'registration_callback'):
61b2328f9ed9 rename registration callback, clear argument to register
sylvain.thenault@logilab.fr
parents: 665
diff changeset
   437
            module.registration_callback(self)
660
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   438
        else:
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   439
            self.info('loading %s', module)
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   440
            for objname, obj in vars(module).items():
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   441
                if objname.startswith('_'):
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   442
                    continue
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   443
                self.load_ancestors_then_object(module.__name__, obj)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   444
        return self._registered
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
    
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   446
    def load_ancestors_then_object(self, modname, obj):
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        # skip imported classes
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
        if getattr(obj, '__module__', None) != modname:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
        # skip non registerable object
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
            if not issubclass(obj, VObject):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
                return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
        except TypeError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
        objname = '%s.%s' % (modname, obj.__name__)
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   457
        if objname in self._registered:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   458
            return
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   459
        self._registered[objname] = obj
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   460
        for parent in obj.__bases__:
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   461
            self.load_ancestors_then_object(modname, parent)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   462
        self.load_object(obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   463
            
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   464
    def load_object(self, obj):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   465
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   466
            self.register_vobject_class(obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   467
        except Exception, ex:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   468
            if self.config.mode in ('test', 'dev'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   469
                raise
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   470
            self.exception('vobject %s registration failed: %s', obj, ex)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   471
        
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   472
    # old automatic registration XXX deprecated ###############################
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   473
    
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   474
    def register_vobject_class(self, cls):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   475
        """handle vobject class registration
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   476
        
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   477
        vobject class with __abstract__ == True in their local dictionnary or
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   478
        with a name starting starting by an underscore are not registered.
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   479
        Also a vobject class needs to have __registry__ and id attributes set
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   480
        to a non empty string to be registered.
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   481
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   482
        Registration is actually handled by vobject's registerer.
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   483
        """
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   484
        if (cls.__dict__.get('__abstract__') or cls.__name__[0] == '_'
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   485
            or not cls.__registry__ or not cls.id):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   486
            return
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   487
        regname = cls.__registry__
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   488
        if cls.id in self.config['disable-%s' % regname]:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   489
            return
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   490
        registry = self._registries.setdefault(regname, {})
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   491
        vobjects = registry.setdefault(cls.id, [])
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   492
        registerer = cls.__registerer__(self, cls)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   493
        cls = registerer.do_it_yourself(vobjects)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   494
        if cls:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   495
            self.register(cls)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   496
            
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   497
    def unregister_module_vobjects(self, modname):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   498
        """removes registered objects coming from a given module
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   499
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   500
        returns a dictionnary classid/class of all classes that will need
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   501
        to be updated after reload (i.e. vobjects referencing classes defined
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   502
        in the <modname> module)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   503
        """
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   504
        unregistered = {}
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   505
        # browse each registered object
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   506
        for registry, objdict in self.items():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   507
            for oid, objects in objdict.items():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   508
                for obj in objects[:]:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   509
                    objname = obj.classid()
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   510
                    # if the vobject is defined in this module, remove it
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   511
                    if objname.startswith(modname):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   512
                        unregistered[objname] = obj
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   513
                        objects.remove(obj)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   514
                        self.debug('unregistering %s in %s registry',
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   515
                                  objname, registry)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   516
                    # if not, check if the vobject can be found in baseclasses
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   517
                    # (because we also want subclasses to be updated)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   518
                    else:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   519
                        if not isinstance(obj, type):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   520
                            obj = obj.__class__
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   521
                        for baseclass in obj.__bases__:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   522
                            if hasattr(baseclass, 'classid'):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   523
                                baseclassid = baseclass.classid()
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   524
                                if baseclassid.startswith(modname):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   525
                                    unregistered[baseclassid] = baseclass
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   526
                # update oid entry
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   527
                if objects:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   528
                    objdict[oid] = objects
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   529
                else:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   530
                    del objdict[oid]
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   531
        return unregistered
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   532
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   533
    def update_registered_subclasses(self, oldnew_mapping):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   534
        """updates subclasses of re-registered vobjects
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   535
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   536
        if baseviews.PrimaryView is changed, baseviews.py will be reloaded
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   537
        automatically and the new version of PrimaryView will be registered.
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   538
        But all existing subclasses must also be notified of this change, and
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   539
        that's what this method does
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   540
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   541
        :param oldnew_mapping: a dict mapping old version of a class to
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   542
                               the new version
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   543
        """
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   544
        # browse each registered object
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   545
        for objdict in self.values():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   546
            for objects in objdict.values():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   547
                for obj in objects:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   548
                    if not isinstance(obj, type):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   549
                        obj = obj.__class__
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   550
                    # build new baseclasses tuple
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   551
                    newbases = tuple(oldnew_mapping.get(baseclass, baseclass)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   552
                                     for baseclass in obj.__bases__)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   553
                    # update obj's baseclasses tuple (__bases__) if needed
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   554
                    if newbases != obj.__bases__:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   555
                        self.debug('updating %s.%s base classes',
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   556
                                  obj.__module__, obj.__name__)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   557
                        obj.__bases__ = newbases
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   558
        
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   559
# init logging 
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   560
set_log_methods(VObject, getLogger('cubicweb'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   561
set_log_methods(VRegistry, getLogger('cubicweb.registry'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   562
set_log_methods(registerer, getLogger('cubicweb.registration'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   563
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   564
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   565
# advanced selector building functions ########################################
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   566
623
9dc7b3fa59f1 chainfirst / chainall can be given a name argument to use as inner function's name
sylvain.thenault@logilab.fr
parents: 615
diff changeset
   567
def chainall(*selectors, **kwargs):
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   568
    """return a selector chaining given selectors. If one of
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   569
    the selectors fail, selection will fail, else the returned score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   570
    will be the sum of each selector'score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   571
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   572
    assert selectors
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   573
    def selector(cls, *args, **kwargs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   574
        score = 0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   575
        for selector in selectors:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   576
            partscore = selector(cls, *args, **kwargs)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   577
            if not partscore:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   578
                return 0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   579
            score += partscore
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   580
        return score
623
9dc7b3fa59f1 chainfirst / chainall can be given a name argument to use as inner function's name
sylvain.thenault@logilab.fr
parents: 615
diff changeset
   581
    if 'name' in kwargs:
9dc7b3fa59f1 chainfirst / chainall can be given a name argument to use as inner function's name
sylvain.thenault@logilab.fr
parents: 615
diff changeset
   582
        selector.__name__ = kwargs['name']
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   583
    return selector
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   584
623
9dc7b3fa59f1 chainfirst / chainall can be given a name argument to use as inner function's name
sylvain.thenault@logilab.fr
parents: 615
diff changeset
   585
def chainfirst(*selectors, **kwargs):
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   586
    """return a selector chaining given selectors. If all
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   587
    the selectors fail, selection will fail, else the returned score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   588
    will be the first non-zero selector score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   589
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   590
    assert selectors
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   591
    def selector(cls, *args, **kwargs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   592
        for selector in selectors:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   593
            partscore = selector(cls, *args, **kwargs)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   594
            if partscore:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   595
                return partscore
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   596
        return 0
623
9dc7b3fa59f1 chainfirst / chainall can be given a name argument to use as inner function's name
sylvain.thenault@logilab.fr
parents: 615
diff changeset
   597
    if 'name' in kwargs:
9dc7b3fa59f1 chainfirst / chainall can be given a name argument to use as inner function's name
sylvain.thenault@logilab.fr
parents: 615
diff changeset
   598
        selector.__name__ = kwargs['name']
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   599
    return selector
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   600
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   601
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   602
# selector base classes and operations ########################################
631
99f5852f8604 major selector refactoring (mostly to avoid looking for select parameters on the target class), start accept / interface unification)
sylvain.thenault@logilab.fr
parents: 630
diff changeset
   603
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   604
class Selector(object):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   605
    """base class for selector classes providing implementation
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   606
    for operators ``&`` and ``|``
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   607
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   608
    This class is only here to give access to binary operators, the
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   609
    selector logic itself should be implemented in the __call__ method
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   610
    """
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   611
    def __init__(self, *selectors):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   612
        self.selectors = self.merge_selectors(selectors)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   613
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   614
    @classmethod
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   615
    def merge_selectors(cls, selectors):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   616
        """merge selectors when possible :
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   617
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   618
        AndSelector(AndSelector(sel1, sel2), AndSelector(sel3, sel4))
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   619
        ==> AndSelector(sel1, sel2, sel3, sel4)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   620
        """
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   621
        merged_selectors = []
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   622
        for selector in selectors:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   623
            if isinstance(selector, cls):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   624
                merged_selectors += selector.selectors
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   625
            else:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   626
                merged_selectors.append(selector)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   627
        return merged_selectors
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   628
        
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   629
    def __and__(self, other):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   630
        return AndSelector(self, other)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   631
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   632
    def __or__(self, other):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   633
        return OrSelector(self, other)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   634
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   635
    __ror__ = __or__    # for cases like (function | selector)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   636
    __rand__ = __and__  # for cases like (function & selector)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   637
    # XXX (function | function) or (function & function) not managed yet
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   638
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   639
    def __call__(self, cls, *args, **kwargs):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   640
        return NotImplementedError("selector %s must implement its logic "
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   641
                                   "in its __call__ method" % self.__class__.__name__)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   642
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   643
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   644
class AndSelector(Selector):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   645
    """and-chained selectors (formerly known as chainall)"""
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   646
    def __call__(self, cls, *args, **kwargs):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   647
        score = 0
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   648
        for selector in self.selectors:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   649
            partscore = selector(cls, *args, **kwargs)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   650
            if not partscore:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   651
                return 0
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   652
            score += partscore
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   653
        return score
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   654
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   655
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   656
class OrSelector(Selector):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   657
    """or-chained selectors (formerly known as chainfirst)"""
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   658
    def __call__(self, cls, *args, **kwargs):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   659
        for selector in self.selectors:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   660
            partscore = selector(cls, *args, **kwargs)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   661
            if partscore:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   662
                return partscore
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   663
        return 0