U k&p[ @s(dZGdddeZGdddeZdS)aHooks with callbacks. In order to de-couple parts of the application, especially when plugins are used, hooks can be used. A hook is a location in the application code where plugins may want to do something. Each hook has a name and a list of callbacks. The application defines the name and the location where the hook will be invoked, and the plugins (or other parts of the application) will register callbacks. c@s0eZdZdZddZddZddZdd Zd S) HookzA hook.cCs g|_dSN callbacks)selfr-/usr/lib/python3/dist-packages/cliapp/hook.py__init__"sz Hook.__init__cCs||jkr|j||S)znAdd a callback to this hook. Return an identifier that can be used to remove this callback. )rappend)rcallbackrrr add_callback%s  zHook.add_callbackcOs|jD]}|||qdS)z,Call all callbacks with the given arguments.Nr)rargskwargsr rrrcall_callbacks0s zHook.call_callbackscCs||jkr|j|dS)zRemove a specific callback.N)rremove)rZ callback_idrrrremove_callback5s zHook.remove_callbackN)__name__ __module__ __qualname____doc__rr rrrrrrrs  rc@seZdZdZddZdS) FilterHookaVA hook which filters data through callbacks. Every hook of this type accepts a piece of data as its first argument Each callback gets the return value of the previous one as its argument. The caller gets the value of the final callback. Other arguments (with or without keywords) are passed as-is to each callback. cOs |jD]}||f||}q|Srr)rdatar r r rrrrHs zFilterHook.call_callbacksN)rrrrrrrrrr;s rN)robjectrrrrrrs