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|
;;; jupiter-compound.el --- Jupiter compound operation
;;
;; Copyright (C) 2009 Jan Moringen
;;
;; Author: Jan Moringen <scymtym@users.sourceforge.net>
;; Keywords: jupiter, operation, compound
;; X-RCS: $Id:$
;;
;; This file is part of Rudel.
;;
;; Rudel is free software: you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; Rudel is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with Rudel. If not, see <http://www.gnu.org/licenses>.
;;; Commentary:
;;
;; Class `jupiter-compound' implements a compound operation comprised
;; of a number of child operations.
;;; History:
;;
;; 0.1 - Initial revision
;;; Code:
;;
(require 'eieio)
(require 'jupiter-operation)
;;; Class jupiter-compound
;;
(defclass jupiter-compound (jupiter-operation)
((children :initarg :children
:type list
:initform nil
:documentation
""))
"Objects of this class are operations, which are composed of a
number of child operation.")
;; TODO this has side effects. It can only be called once
(defmethod rudel-apply ((this jupiter-compound) object)
"Apply THIS to BUFFER by applying the child operation."
(with-slots (children) this
(let ((child (first children))
(rest (rest children)))
;; Apply all child operations
(while child
(rudel-apply child object)
;; For each applied child operation, transform remaining
;; operation with the applied operation.
(dolist (next rest)
(setf next (jupiter-transform child next)))
;; Advance to next child operation.
(setq child (first rest)
rest (rest rest)))))
)
(defmethod jupiter-transform ((this jupiter-compound) other)
"Transform OTHER using the child operations of THIS."
(with-slots (children) this
(dolist (child children) ;; TODO reverse children?
(setq other (jupiter-transform child other)))
other))
(defmethod object-print ((this jupiter-compound) &rest strings)
"Add number of children to string representation of THIS."
(with-slots (children) this
(call-next-method
this
(format " children %d" (length children)))))
(provide 'jupiter-compound)
;;; jupiter-compound.el ends here
|
