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(asdf:oos 'asdf:load-op :contextl)
(in-package :contextl-user)
(defclass grouped-layer (standard-layer-class) ())
(defgeneric group-root (layer))
(defgeneric default-layer (layer))
(define-layered-method adjoin-layer-using-class
((to-add grouped-layer) active-layers)
(call-next-layered-method
to-add
(remove-layer (group-root (find-layer to-add)) active-layers)))
(define-layered-method remove-layer-using-class
((to-remove grouped-layer) active-layers)
(declare (ignore active-layers))
(multiple-value-bind
(new-layers cacheablep)
(call-next-method)
(values
(adjoin-layer (default-layer (find-layer to-remove)) new-layers)
cacheablep)))
(deflayer output ()
((group-root :initform 'output :reader group-root)
(default-layer :initform 'standard-output :reader default-layer)))
(deflayer standard-output (output) ()
(:metaclass grouped-layer))
(deflayer html-output (output) ()
(:metaclass grouped-layer))
(deflayer xml-output (output) ()
(:metaclass grouped-layer))
(deflayer json-output (output) ()
(:metaclass grouped-layer))
(define-layered-function make-output ()
(:method () '(output))
(:method :in standard-output ()
(list* 'standard-output (call-next-method)))
(:method :in html-output ()
(list* 'html-output (call-next-method)))
(:method :in xml-output ()
(list* 'xml-output (call-next-method)))
(:method :in json-output ()
(list* 'json-output (call-next-method))))
(assert (equal (make-output) '(output)))
(with-active-layers (standard-output)
(assert (equal (make-output) '(standard-output output)))
(with-active-layers (html-output)
(assert (equal (make-output) '(html-output output)))
(with-active-layers (xml-output)
(assert (equal (make-output) '(xml-output output)))
(with-inactive-layers (xml-output)
(assert (equal (make-output) '(standard-output output))))
(assert (equal (make-output) '(xml-output output))))
(assert (equal (make-output) '(html-output output))))
(assert (equal (make-output) '(standard-output output))))
(print :done)
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