188     # XXX hooks control stuff should probably be on the session, not on the config

   189 

   190     # hooks activation configuration

   191     # all hooks should be activated during normal execution

   192     disabled_hooks_categories = set()

   193     enabled_hooks_categories = set()

   194     ALLOW_ALL = object()

   195     DENY_ALL = object()

   196     hooks_mode = ALLOW_ALL

   197 

   198     @classmethod

   199     def set_hooks_mode(cls, mode):

   200         assert mode is cls.ALLOW_ALL or mode is cls.DENY_ALL

   201         oldmode = cls.hooks_mode

   202         cls.hooks_mode = mode

   203         return oldmode

   204 

   205     @classmethod

   206     def disable_hook_category(cls, *categories):

   207         changes = set()

   208         if cls.hooks_mode is cls.DENY_ALL:

   209             for category in categories:

   210                 if category in cls.enabled_hooks_categories:

   211                     cls.enabled_hooks_categories.remove(category)

   212                     changes.add(category)

   213         else:

   214             for category in categories:

   215                 if category not in cls.disabled_hooks_categories:

   216                     cls.disabled_hooks_categories.add(category)

   217                     changes.add(category)

   218         return changes

   219 

   220     @classmethod

   221     def enable_hook_category(cls, *categories):

   222         changes = set()

   223         if cls.hooks_mode is cls.DENY_ALL:

   224             for category in categories:

   225                 if category not in cls.enabled_hooks_categories:

   226                     cls.enabled_hooks_categories.add(category)

   227                     changes.add(category)

   228         else:

   229             for category in categories:

   230                 if category in cls.disabled_hooks_categories:

   231                     cls.disabled_hooks_categories.remove(category)

   232                     changes.add(category)

   233         return changes

   234 

   235     @classmethod

   236     def is_hook_activated(cls, hook):

   237         return cls.is_hook_category_activated(hook.category)

   238 

   239     @classmethod

   240     def is_hook_category_activated(cls, category):

   241         if cls.hooks_mode is cls.DENY_ALL:

   242             return category in cls.enabled_hooks_categories

   243         return category not in cls.disabled_hooks_categories

   244