vregistry.py
author sylvain.thenault@logilab.fr
Thu, 30 Apr 2009 00:39:09 +0200
branchtls-sprint
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parent 1433 091ac3ba5d51
child 1641 2c80b09d8d86
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use xml_escape
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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 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, exists
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from logging import getLogger
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import types
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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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def _toload_info(path, _toload=None):
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    """return a dictionary of <modname>: <modpath> and an ordered list of
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    (file, module name) to load
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    """
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    from logilab.common.modutils import modpath_from_file
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    if _toload is None:
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        _toload = {}, []
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    for fileordir in path:
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        if isdir(fileordir) and exists(join(fileordir, '__init__.py')):
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            subfiles = [join(fileordir, fname) for fname in listdir(fileordir)]
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            _toload_info(subfiles, _toload)
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        elif fileordir[-3:] == '.py':
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            modname = '.'.join(modpath_from_file(fileordir))
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            _toload[0][modname] = fileordir
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            _toload[1].append((fileordir, modname))
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    return _toload
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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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    :__select__:
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      class'selector
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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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    # necessary attributes to interact with the registry
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    id = None
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    __registry__ = 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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        cls.build___select__()
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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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    # XXX bw compat code
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    @classmethod
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    def build___select__(cls):
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        for klass in cls.mro():
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            if klass.__name__ == 'AppRsetObject':
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                continue # the bw compat __selector__ is there
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            klassdict = klass.__dict__
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            if ('__select__' in klassdict and '__selectors__' in klassdict
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                and '__selgenerated__' not in klassdict):
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                raise TypeError("__select__ and __selectors__ can't be used together on class %s" % cls)
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            if '__selectors__' in klassdict and '__selgenerated__' not in klassdict:
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                cls.__selgenerated__ = True
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                # case where __selectors__ is defined locally (but __select__
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                # is in a parent class)
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                selectors = klassdict['__selectors__']
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                if len(selectors) == 1:
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                    # micro optimization: don't bother with AndSelector if there's
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                    # only one selector
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                    select = _instantiate_selector(selectors[0])
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                else:
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                    select = AndSelector(*selectors)
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                cls.__select__ = select
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   123
0
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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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0
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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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   143
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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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   148
        return self._registries.items()
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    def values(self):
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   151
        return self._registries.values()
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    def __contains__(self, key):
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        return key in self._registries
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   155
0
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   156
    def registry(self, name):
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        """return the registry (dictionary of class objects) associated to
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   158
        this name
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   159
        """
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   160
        try:
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   161
            return self._registries[name]
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   162
        except KeyError:
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   163
            raise RegistryNotFound(name), None, sys.exc_info()[-1]
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parents:
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   164
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   165
    def registry_objects(self, name, oid=None):
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   166
        """returns objects registered with the given oid in the given registry.
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parents:
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   167
        If no oid is given, return all objects in this registry
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diff changeset
   168
        """
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   169
        registry = self.registry(name)
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   170
        if oid:
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   171
            try:
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   172
                return registry[oid]
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   173
            except KeyError:
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   174
                raise ObjectNotFound(oid), None, sys.exc_info()[-1]
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        else:
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   176
            result = []
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   177
            for objs in registry.values():
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                result += objs
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            return result
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   180
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   181
    def object_by_id(self, registry, cid, *args, **kwargs):
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   182
        """return the most specific component according to the resultset"""
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   183
        objects = self[registry][cid]
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   184
        assert len(objects) == 1, objects
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   185
        return objects[0].selected(*args, **kwargs)
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   186
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diff changeset
   187
    # methods for explicit (un)registration ###################################
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   188
61b2328f9ed9 rename registration callback, clear argument to register
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diff changeset
   189
#     def clear(self, key):
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diff changeset
   190
#         regname, oid = key.split('.')
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diff changeset
   191
#         self[regname].pop(oid, None)
695
356da23c57f1 try a register_all method
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parents: 693
diff changeset
   192
    def register_all(self, objects, modname, butclasses=()):
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diff changeset
   193
        for obj in objects:
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diff changeset
   194
            try:
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diff changeset
   195
                if obj.__module__ != modname or obj in butclasses:
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diff changeset
   196
                    continue
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diff changeset
   197
                oid = obj.id
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diff changeset
   198
            except AttributeError:
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diff changeset
   199
                continue
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diff changeset
   200
            if oid:
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diff changeset
   201
                self.register(obj)
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diff changeset
   202
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61b2328f9ed9 rename registration callback, clear argument to register
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diff changeset
   203
    def register(self, obj, registryname=None, oid=None, clear=False):
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diff changeset
   204
        """base method to add an object in the registry"""
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21a59b468f1a __selectors__ -> __select__
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diff changeset
   205
        assert not '__abstract__' in obj.__dict__
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diff changeset
   206
        registryname = registryname or obj.__registry__
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diff changeset
   207
        oid = oid or obj.id
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39721e56b56d assert oid
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diff changeset
   208
        assert oid
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diff changeset
   209
        registry = self._registries.setdefault(registryname, {})
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diff changeset
   210
        if clear:
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diff changeset
   211
            vobjects = registry[oid] =  []
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diff changeset
   212
        else:
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parents: 665
diff changeset
   213
            vobjects = registry.setdefault(oid, [])
665
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diff changeset
   214
        # registered() is technically a classmethod but is not declared
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parents: 660
diff changeset
   215
        # as such because we need to compose registered in some cases
682
sylvain.thenault@logilab.fr
parents: 673
diff changeset
   216
        vobject = obj.registered.im_func(obj, self)
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parents: 1282
diff changeset
   217
        assert not vobject in vobjects, vobject
804
cc339d3ff7ae assert __select__ is callable
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parents: 780
diff changeset
   218
        assert callable(vobject.__select__), vobject
665
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diff changeset
   219
        vobjects.append(vobject)
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diff changeset
   220
        try:
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parents: 660
diff changeset
   221
            vname = vobject.__name__
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parents: 660
diff changeset
   222
        except AttributeError:
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diff changeset
   223
            vname = vobject.__class__.__name__
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parents: 660
diff changeset
   224
        self.debug('registered vobject %s in registry %s with id %s',
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parents: 660
diff changeset
   225
                   vname, registryname, oid)
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parents: 660
diff changeset
   226
        # automatic reloading management
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99dfced5673e fix vobjects registration to deal with objects inter-dependancy
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parents: 1282
diff changeset
   227
        self._loadedmods[obj.__module__]['%s.%s' % (obj.__module__, oid)] = obj
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diff changeset
   228
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diff changeset
   229
    def unregister(self, obj, registryname=None):
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diff changeset
   230
        registryname = registryname or obj.__registry__
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diff changeset
   231
        registry = self.registry(registryname)
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diff changeset
   232
        removed_id = obj.classid()
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parents: 660
diff changeset
   233
        for registered in registry[obj.id]:
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parents: 660
diff changeset
   234
            # use classid() to compare classes because vreg will probably
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parents: 660
diff changeset
   235
            # have its own version of the class, loaded through execfile
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parents: 660
diff changeset
   236
            if registered.classid() == removed_id:
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parents: 660
diff changeset
   237
                # XXX automatic reloading management
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parents: 660
diff changeset
   238
                try:
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parents: 660
diff changeset
   239
                    registry[obj.id].remove(registered)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
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parents: 660
diff changeset
   240
                except ValueError:
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parents: 660
diff changeset
   241
                    self.warning('can\'t remove %s, no id %s in the %s registry',
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parents: 660
diff changeset
   242
                                 removed_id, obj.id, registryname)
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parents: 660
diff changeset
   243
                except ValueError:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
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parents: 660
diff changeset
   244
                    self.warning('can\'t remove %s, not in the %s registry with id %s',
1305da1ce3f9 reorganize a bit, some cleanup and fixes
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parents: 660
diff changeset
   245
                                 removed_id, registryname, obj.id)
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parents: 660
diff changeset
   246
#                 else:
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parents: 660
diff changeset
   247
#                     # if objects is empty, remove oid from registry
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parents: 660
diff changeset
   248
#                     if not registry[obj.id]:
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091ac3ba5d51 remove trailing white spaces
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parents: 1432
diff changeset
   249
#                         del regcontent[oid]
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
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diff changeset
   250
                break
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091ac3ba5d51 remove trailing white spaces
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parents: 1432
diff changeset
   251
665
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diff changeset
   252
    def register_and_replace(self, obj, replaced, registryname=None):
673
64c50cb17d70 factorized impl
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parents: 668
diff changeset
   253
        if hasattr(replaced, 'classid'):
64c50cb17d70 factorized impl
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parents: 668
diff changeset
   254
            replaced = replaced.classid()
665
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parents: 660
diff changeset
   255
        registryname = registryname or obj.__registry__
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        registry = self.registry(registryname)
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        registered_objs = registry[obj.id]
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   258
        for index, registered in enumerate(registered_objs):
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   259
            if registered.classid() == replaced:
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                del registry[obj.id][index]
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                break
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        self.register(obj, registryname=registryname)
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   263
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    # dynamic selection methods ###############################################
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0
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    def select(self, vobjects, *args, **kwargs):
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        """return an instance of the most specific object according
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        to parameters
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        raise NoSelectableObject if not object apply
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        """
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        score, winners = 0, []
0
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        for vobject in vobjects:
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            vobjectscore = vobject.__select__(vobject, *args, **kwargs)
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            if vobjectscore > score:
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                score, winners = vobjectscore, [vobject]
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            elif vobjectscore > 0 and vobjectscore == score:
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                winners.append(vobject)
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        if not winners:
0
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            raise NoSelectableObject('args: %s\nkwargs: %s %s'
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                                     % (args, kwargs.keys(),
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                                        [repr(v) for v in vobjects]))
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        if len(winners) > 1:
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            if self.config.mode == 'installed':
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   285
                self.error('select ambiguity, args: %s\nkwargs: %s %s',
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   286
                           args, kwargs.keys(), [repr(v) for v in winners])
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   287
            else:
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   288
                raise Exception('select ambiguity, args: %s\nkwargs: %s %s'
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                                % (args, kwargs.keys(),
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                                   [repr(v) for v in winners]))
177
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   291
        winner = winners[0]
0
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        # return the result of the .selected method of the vobject
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   293
        return winner.selected(*args, **kwargs)
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   294
0
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   295
    def possible_objects(self, registry, *args, **kwargs):
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   296
        """return an iterator on possible objects in a registry for this result set
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   298
        actions returned are classes, not instances
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        """
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        for vobjects in self.registry(registry).values():
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   301
            try:
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   302
                yield self.select(vobjects, *args, **kwargs)
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   303
            except NoSelectableObject:
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   304
                continue
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   305
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   306
    def select_object(self, registry, cid, *args, **kwargs):
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   307
        """return the most specific component according to the resultset"""
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   308
        return self.select(self.registry_objects(registry, cid), *args, **kwargs)
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   309
0
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   310
    # intialization methods ###################################################
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   311
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   312
    def init_registration(self, path):
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   313
        # compute list of all modules that have to be loaded
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        self._toloadmods, filemods = _toload_info(path)
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        self._loadedmods = {}
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   316
        return filemods
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   317
0
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   318
    def register_objects(self, path, force_reload=None):
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   319
        if force_reload is None:
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   320
            force_reload = self.config.mode == 'dev'
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   321
        elif not force_reload:
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   322
            # force_reload == False usually mean modules have been reloaded
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   323
            # by another connection, so we want to update the registry
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   324
            # content even if there has been no module content modification
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   325
            self.reset()
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diff changeset
   326
        # need to clean sys.path this to avoid import confusion pb (i.e.
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   327
        # having the same module loaded as 'cubicweb.web.views' subpackage and
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diff changeset
   328
        # as views'  or 'web.views' subpackage
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diff changeset
   329
        # this is mainly for testing purpose, we should'nt need this in
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diff changeset
   330
        # production environment
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diff changeset
   331
        for webdir in (join(dirname(realpath(__file__)), 'web'),
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diff changeset
   332
                       join(dirname(__file__), 'web')):
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diff changeset
   333
            if webdir in sys.path:
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diff changeset
   334
                sys.path.remove(webdir)
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diff changeset
   335
        if CW_SOFTWARE_ROOT in sys.path:
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   336
            sys.path.remove(CW_SOFTWARE_ROOT)
0
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diff changeset
   337
        # load views from each directory in the application's path
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   338
        filemods = self.init_registration(path)
0
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diff changeset
   339
        change = False
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diff changeset
   340
        for filepath, modname in filemods:
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diff changeset
   341
            if self.load_file(filepath, modname, force_reload):
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diff changeset
   342
                change = True
0
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diff changeset
   343
        return change
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diff changeset
   344
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diff changeset
   345
    def load_file(self, filepath, modname, force_reload=False):
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diff changeset
   346
        """load visual objects from a python file"""
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diff changeset
   347
        from logilab.common.modutils import load_module_from_name
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diff changeset
   348
        if modname in self._loadedmods:
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diff changeset
   349
            return
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diff changeset
   350
        self._loadedmods[modname] = {}
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diff changeset
   351
        try:
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diff changeset
   352
            modified_on = stat(filepath)[-2]
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diff changeset
   353
        except OSError:
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diff changeset
   354
            # this typically happens on emacs backup files (.#foo.py)
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diff changeset
   355
            self.warning('Unable to load %s. It is likely to be a backup file',
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diff changeset
   356
                         filepath)
0
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diff changeset
   357
            return False
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   358
        if filepath in self._lastmodifs:
0
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diff changeset
   359
            # only load file if it was modified
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diff changeset
   360
            if modified_on <= self._lastmodifs[filepath]:
0
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diff changeset
   361
                return
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diff changeset
   362
            # if it was modified, unregister all exisiting objects
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diff changeset
   363
            # from this module, and keep track of what was unregistered
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parents: 1282
diff changeset
   364
            unregistered = self.unregister_module_vobjects(modname)
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diff changeset
   365
        else:
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diff changeset
   366
            unregistered = None
0
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diff changeset
   367
        # load the module
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diff changeset
   368
        module = load_module_from_name(modname, use_sys=not force_reload)
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diff changeset
   369
        self.load_module(module)
0
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diff changeset
   370
        # if something was unregistered, we need to update places where it was
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diff changeset
   371
        # referenced
0
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diff changeset
   372
        if unregistered:
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diff changeset
   373
            # oldnew_mapping = {}
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diff changeset
   374
            registered = self._loadedmods[modname]
0
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diff changeset
   375
            oldnew_mapping = dict((unregistered[name], registered[name])
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diff changeset
   376
                                  for name in unregistered if name in registered)
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diff changeset
   377
            self.update_registered_subclasses(oldnew_mapping)
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diff changeset
   378
        self._lastmodifs[filepath] = modified_on
0
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parents:
diff changeset
   379
        return True
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parents:
diff changeset
   380
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diff changeset
   381
    def load_module(self, module):
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diff changeset
   382
        self.info('loading %s', module)
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parents: 665
diff changeset
   383
        if hasattr(module, 'registration_callback'):
61b2328f9ed9 rename registration callback, clear argument to register
sylvain.thenault@logilab.fr
parents: 665
diff changeset
   384
            module.registration_callback(self)
660
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   385
        else:
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   386
            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
   387
                if objname.startswith('_'):
5233a9457f6b work in progress, draft for manual registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 652
diff changeset
   388
                    continue
1310
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   389
                self._load_ancestors_then_object(module.__name__, obj)
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   390
        self.debug('loaded %s', module)
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   391
1310
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   392
    def _load_ancestors_then_object(self, modname, obj):
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   393
        # imported classes
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   394
        objmodname = getattr(obj, '__module__', None)
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   395
        if objmodname != modname:
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   396
            if objmodname in self._toloadmods:
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   397
                self.load_file(self._toloadmods[objmodname], objmodname)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
        # skip non registerable object
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
            if not issubclass(obj, VObject):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
                return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
        except TypeError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
        objname = '%s.%s' % (modname, obj.__name__)
1310
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   406
        if objname in self._loadedmods[modname]:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
            return
1310
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   408
        self._loadedmods[modname][objname] = obj
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
        for parent in obj.__bases__:
1310
99dfced5673e fix vobjects registration to deal with objects inter-dependancy
sylvain.thenault@logilab.fr
parents: 1282
diff changeset
   410
            self._load_ancestors_then_object(modname, parent)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
        self.load_object(obj)
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   412
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
    def load_object(self, obj):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
            self.register_vobject_class(obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
        except Exception, ex:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
            if self.config.mode in ('test', 'dev'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
                raise
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
            self.exception('vobject %s registration failed: %s', obj, ex)
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   420
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   421
    # old automatic registration XXX deprecated ###############################
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   422
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   423
    def register_vobject_class(self, cls):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   424
        """handle vobject class registration
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   425
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   426
        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
   427
        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
   428
        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
   429
        to a non empty string to be registered.
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   430
        """
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   431
        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
   432
            or not cls.__registry__ or not cls.id):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   433
            return
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   434
        regname = cls.__registry__
1046
52ee022d87e3 simplify registry options to disable some appobjects to use a single option
sylvain.thenault@logilab.fr
parents: 946
diff changeset
   435
        if '%s.%s' % (regname, cls.id) in self.config['disable-appobjects']:
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   436
            return
1432
2c3711d4570b drop hopeless registerer bw compat
sylvain.thenault@logilab.fr
parents: 1316
diff changeset
   437
        self.register(cls)
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   438
665
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   439
    def unregister_module_vobjects(self, modname):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   440
        """removes registered objects coming from a given module
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   441
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   442
        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
   443
        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
   444
        in the <modname> module)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   445
        """
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   446
        unregistered = {}
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   447
        # browse each registered object
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   448
        for registry, objdict in self.items():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   449
            for oid, objects in objdict.items():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   450
                for obj in objects[:]:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   451
                    objname = obj.classid()
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   452
                    # 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
   453
                    if objname.startswith(modname):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   454
                        unregistered[objname] = obj
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   455
                        objects.remove(obj)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   456
                        self.debug('unregistering %s in %s registry',
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   457
                                  objname, registry)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   458
                    # 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
   459
                    # (because we also want subclasses to be updated)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   460
                    else:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   461
                        if not isinstance(obj, type):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   462
                            obj = obj.__class__
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   463
                        for baseclass in obj.__bases__:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   464
                            if hasattr(baseclass, 'classid'):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   465
                                baseclassid = baseclass.classid()
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   466
                                if baseclassid.startswith(modname):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   467
                                    unregistered[baseclassid] = baseclass
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   468
                # update oid entry
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   469
                if objects:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   470
                    objdict[oid] = objects
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   471
                else:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   472
                    del objdict[oid]
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   473
        return unregistered
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   474
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   475
    def update_registered_subclasses(self, oldnew_mapping):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   476
        """updates subclasses of re-registered vobjects
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   477
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   478
        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
   479
        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
   480
        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
   481
        that's what this method does
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   482
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   483
        :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
   484
                               the new version
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   485
        """
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   486
        # browse each registered object
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   487
        for objdict in self.values():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   488
            for objects in objdict.values():
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   489
                for obj in objects:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   490
                    if not isinstance(obj, type):
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   491
                        obj = obj.__class__
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   492
                    # build new baseclasses tuple
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   493
                    newbases = tuple(oldnew_mapping.get(baseclass, baseclass)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   494
                                     for baseclass in obj.__bases__)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   495
                    # update obj's baseclasses tuple (__bases__) if needed
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   496
                    if newbases != obj.__bases__:
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   497
                        self.debug('updating %s.%s base classes',
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   498
                                  obj.__module__, obj.__name__)
1305da1ce3f9 reorganize a bit, some cleanup and fixes
sylvain.thenault@logilab.fr
parents: 660
diff changeset
   499
                        obj.__bases__ = newbases
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   500
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   501
# init logging
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   502
set_log_methods(VObject, getLogger('cubicweb'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   503
set_log_methods(VRegistry, getLogger('cubicweb.registry'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   504
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   505
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   506
# 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
   507
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   508
class Selector(object):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   509
    """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
   510
    for operators ``&`` and ``|``
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   511
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   512
    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
   513
    selector logic itself should be implemented in the __call__ method
718
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   514
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   515
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   516
    a selector is called to help choosing the correct object for a
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   517
    particular context by returning a score (`int`) telling how well
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   518
    the class given as first argument apply to the given context.
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   519
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   520
    0 score means that the class doesn't apply.
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   521
    """
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   522
711
f758b86cf484 Selector objects need to provide a `func_name` attribute for minimum (backward)
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 710
diff changeset
   523
    @property
f758b86cf484 Selector objects need to provide a `func_name` attribute for minimum (backward)
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 710
diff changeset
   524
    def func_name(self):
f758b86cf484 Selector objects need to provide a `func_name` attribute for minimum (backward)
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 710
diff changeset
   525
        # backward compatibility
f758b86cf484 Selector objects need to provide a `func_name` attribute for minimum (backward)
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 710
diff changeset
   526
        return self.__class__.__name__
f758b86cf484 Selector objects need to provide a `func_name` attribute for minimum (backward)
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 710
diff changeset
   527
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   528
    def search_selector(self, selector):
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   529
        """search for the given selector or selector instance in the selectors
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   530
        tree. Return it of None if not found
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   531
        """
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   532
        if self is selector:
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   533
            return self
721
sylvain.thenault@logilab.fr
parents: 719
diff changeset
   534
        if isinstance(selector, type) and isinstance(self, selector):
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   535
            return self
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   536
        return None
780
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   537
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   538
    def __str__(self):
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   539
        return self.__class__.__name__
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   540
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   541
    def __and__(self, other):
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   542
        return AndSelector(self, other)
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   543
    def __rand__(self, other):
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   544
        return AndSelector(other, self)
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   545
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   546
    def __or__(self, other):
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   547
        return OrSelector(self, other)
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   548
    def __ror__(self, other):
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   549
        return OrSelector(other, self)
827
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   550
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   551
    def __invert__(self):
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   552
        return NotSelector(self)
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   553
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   554
    # XXX (function | function) or (function & function) not managed yet
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   555
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   556
    def __call__(self, cls, *args, **kwargs):
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   557
        return NotImplementedError("selector %s must implement its logic "
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   558
                                   "in its __call__ method" % self.__class__)
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   559
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   560
class MultiSelector(Selector):
718
f7011679437a doc update, move yes_registerer here
sylvain.thenault@logilab.fr
parents: 714
diff changeset
   561
    """base class for compound selector classes"""
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   562
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   563
    def __init__(self, *selectors):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   564
        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
   565
780
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   566
    def __str__(self):
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   567
        return '%s(%s)' % (self.__class__.__name__,
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   568
                           ','.join(str(s) for s in self.selectors))
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   569
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   570
    @classmethod
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   571
    def merge_selectors(cls, selectors):
780
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   572
        """deal with selector instanciation when necessary and merge
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   573
        multi-selectors if possible:
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   574
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   575
        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
   576
        ==> 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
   577
        """
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   578
        merged_selectors = []
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   579
        for selector in selectors:
946
a130b5ceeca9 [selectors] _needs real fix_ whack 'till it works for me
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 943
diff changeset
   580
            try:
a130b5ceeca9 [selectors] _needs real fix_ whack 'till it works for me
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 943
diff changeset
   581
                selector = _instantiate_selector(selector)
a130b5ceeca9 [selectors] _needs real fix_ whack 'till it works for me
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 943
diff changeset
   582
            except:
a130b5ceeca9 [selectors] _needs real fix_ whack 'till it works for me
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 943
diff changeset
   583
                pass
a130b5ceeca9 [selectors] _needs real fix_ whack 'till it works for me
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 943
diff changeset
   584
            #assert isinstance(selector, Selector), selector
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   585
            if isinstance(selector, cls):
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   586
                merged_selectors += selector.selectors
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   587
            else:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   588
                merged_selectors.append(selector)
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   589
        return merged_selectors
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   590
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   591
    def search_selector(self, selector):
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   592
        """search for the given selector or selector instance in the selectors
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   593
        tree. Return it of None if not found
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   594
        """
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   595
        for childselector in self.selectors:
780
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   596
            if childselector is selector:
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   597
                return childselector
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   598
            found = childselector.search_selector(selector)
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   599
            if found is not None:
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   600
                return found
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   601
        return None
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   602
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   603
697
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   604
def objectify_selector(selector_func):
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   605
    """convenience decorator for simple selectors where a class definition
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   606
    would be overkill::
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   607
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   608
        @objectify_selector
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   609
        def yes(cls, *args, **kwargs):
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   610
            return 1
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   611
697
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   612
    """
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   613
    return type(selector_func.__name__, (Selector,),
734
4153a82a60a4 get kwargs as well
sylvain.thenault@logilab.fr
parents: 727
diff changeset
   614
                {'__call__': lambda self, *args, **kwargs: selector_func(*args, **kwargs)})
697
06807984e610 provide objectify_selector decorator for very simple selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 695
diff changeset
   615
712
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   616
def _instantiate_selector(selector):
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   617
    """ensures `selector` is a `Selector` instance
1433
091ac3ba5d51 remove trailing white spaces
sylvain.thenault@logilab.fr
parents: 1432
diff changeset
   618
712
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   619
    NOTE: This should only be used locally in build___select__()
946
a130b5ceeca9 [selectors] _needs real fix_ whack 'till it works for me
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 943
diff changeset
   620
    XXX: then, why not do it ??
712
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   621
    """
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   622
    if isinstance(selector, types.FunctionType):
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   623
        return objectify_selector(selector)()
727
30fe8f5afbd8 fix _instantiate_selector() mini bug (make sure obj is a class before calling issubclass)
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 724
diff changeset
   624
    if isinstance(selector, type) and issubclass(selector, Selector):
712
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   625
        return selector()
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   626
    return selector
ce49e3885453 remove autoselectors metaclass, __select__ is built during registration
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 711
diff changeset
   627
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   628
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   629
class AndSelector(MultiSelector):
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   630
    """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
   631
    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
   632
        score = 0
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   633
        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
   634
            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
   635
            if not partscore:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   636
                return 0
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   637
            score += partscore
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   638
        return score
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   639
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   640
698
7dfd03e9e810 introduce MultiSelector base class
sylvain.thenault@logilab.fr
parents: 697
diff changeset
   641
class OrSelector(MultiSelector):
630
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   642
    """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
   643
    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
   644
        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
   645
            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
   646
            if partscore:
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   647
                return partscore
66ff0b2f7d03 simple test implementation for binary operators on selectors
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 615
diff changeset
   648
        return 0
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   649
827
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   650
class NotSelector(Selector):
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   651
    """negation selector"""
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   652
    def __init__(self, selector):
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   653
        self.selector = selector
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   654
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   655
    def __call__(self, cls, *args, **kwargs):
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   656
        score = self.selector(cls, *args, **kwargs)
835
7dcb11dd443e fix relation_possible, ensure we return int
sylvain.thenault@logilab.fr
parents: 827
diff changeset
   657
        return int(not score)
827
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   658
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   659
    def __str__(self):
3f08481e6e51 provide negation operator for selectors, unfortunately, it's not possible to user the python keyword 'not'
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 804
diff changeset
   660
        return 'NOT(%s)' % super(NotSelector, self).__str__()
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   661
835
7dcb11dd443e fix relation_possible, ensure we return int
sylvain.thenault@logilab.fr
parents: 827
diff changeset
   662
7dcb11dd443e fix relation_possible, ensure we return int
sylvain.thenault@logilab.fr
parents: 827
diff changeset
   663
# XXX bw compat functions #####################################################
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   664
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   665
def chainall(*selectors, **kwargs):
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   666
    """return a selector chaining given selectors. If one of
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   667
    the selectors fail, selection will fail, else the returned score
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   668
    will be the sum of each selector'score
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   669
    """
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   670
    assert selectors
759
e044f28372bd chainall / chainfirst ensures selectors are instantiated
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 741
diff changeset
   671
    # XXX do we need to create the AndSelector here, a tuple might be enough
780
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   672
    selector = AndSelector(*selectors)
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   673
    if 'name' in kwargs:
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   674
        selector.__name__ = kwargs['name']
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   675
    return selector
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   676
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   677
def chainfirst(*selectors, **kwargs):
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   678
    """return a selector chaining given selectors. If all
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   679
    the selectors fail, selection will fail, else the returned score
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   680
    will be the first non-zero selector score
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   681
    """
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   682
    assert selectors
780
5b6c93816871 fix selector search and refactor auto-instantiation
sylvain.thenault@logilab.fr
parents: 760
diff changeset
   683
    selector = OrSelector(*selectors)
693
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   684
    if 'name' in kwargs:
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   685
        selector.__name__ = kwargs['name']
cf0817dfc787 reimplements chainall/chainfirst using [And/Or], implemenent search_selector function on Selector base class
sylvain.thenault@logilab.fr
parents: 686
diff changeset
   686
    return selector