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|
;;; jupiter-delete.el --- Jupiter delete operation
;;
;; Copyright (C) 2009 Jan Moringen
;;
;; Author: Jan Moringen <scymtym@users.sourceforge.net>
;; Keywords: jupiter, operation, delete
;; 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-delete' implements a delete operation for the
;; Jupiter algorithm.
;;; History:
;;
;; 0.1 - Initial revision
;;; Code:
;;
(require 'eieio)
(require 'rudel-operations)
(require 'jupiter-operation)
;;; Class jupiter-delete
;;
(defclass jupiter-delete (jupiter-operation
rudel-delete-op)
()
"Objects of this class represent deletions in buffers.")
(defmethod jupiter-transform ((this jupiter-delete) other)
"Transform other using THIS.
OTHER is destructively modified or replaced."
(cond
;;
;; Transform an insert operation
;;
((jupiter-insert-p other)
(with-slots ((this-from :from)
(this-to :to)
(this-length :length)) this
(with-slots ((other-from :from)
(other-to :to)
(other-length :length)) other
(cond
;;
;; <other>
;; <this>
;;
((<= other-to this-from))
;; <other>
;; <this>
((> other-from this-to)
(decf other-from this-length))
;; <other>
;; < this >
((and (> other-from this-from) (< other-to this-to))
(setq other-from this-from))
)))
)
;;
;; Transform a delete operation
;;
((jupiter-delete-p other)
(with-slots ((this-from :from)
(this-to :to)
(this-length :length)) this
(with-slots ((other-from :from)
(other-to :to)
(other-length :length)) other
(cond
;; <other>
;; <this>
;; OTHER deleted a region after the region deleted by
;; THIS. Therefore OTHER has to be shifted by the length of
;; the deleted region.
((> other-from this-to)
(decf other-from this-length)
(decf other-to this-length))
;; <other>
;; <this>
;; OTHER deleted a region before the region affected by
;; THIS. That is not affected by THIS operation.
((<= other-to this-from))
;; < other >
;; <this>
((and (>= other-from this-from) (>= other-to this-to))
(decf other-to this-length))
;; <other>
;; <this>
((and (< other-from this-from) (< other-to this-to))
(decf other-to (- other-to this-to)))
;; <other>
;; <this>
;; The region deleted by OTHER overlaps with the region
;; deleted by THIS, such that a part of the region of this is
;; before the region of OTHER. The first part of the region
;; deleted by OTHER has already been deleted. Therefore, the
;; start of OTHER has to be shifted by the length of the
;; overlap.
((and (< other-from this-to) (> other-to this-to))
(setq other-from this-from)
(incf other-to (+ other-from (- other-to this-to))))
;; <other>
;; < this >
;; The region deleted by OTHER is completely contained in
;; the region affected by THIS. Therefore, OTHER must not
;; be executed.
((and (>= other-from this-from) (<= other-to this-to))
(setq other (jupiter-nop "nop")))
(t (error "logic error in (jupiter-transform (x jupiter-delete) (y jupiter-delete))"))
))))
;;
;; Transform a compound operation
;;
((jupiter-compound-p other) ;; TODO encapsulation violation
(with-slots (children) other
(dolist (child children)
(setf child (jupiter-transform this child)))))
;;
;; Transform a nop operation
;;
((jupiter-nop-p other))
;; TODO this is for debugging
(t (error "Cannot transform operation of type `%s'"
(object-class other))))
other)
(defmethod object-print ((this jupiter-delete) &rest strings)
"Add from, to and length to string representation of THIS."
(with-slots (from to length) this
(call-next-method
this
(format " from %d" from)
(format " to %d" to)
(format " length %d" length)))
)
(provide 'jupiter-delete)
;;; jupiter-delete.el ends here
|
