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;;; jupiter-insert.el --- Jupiter insert operation
;;
;; Copyright (C) 2009 Jan Moringen
;;
;; Author: Jan Moringen <scymtym@users.sourceforge.net>
;; Keywords: jupiter, operation, insert
;; 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-insert' implements an insert operation for the
;; Jupiter algorithm.
;;; History:
;;
;; 0.1 - Initial version
;;; Code:
;;
(require 'eieio)
(require 'rudel-operations)
(require 'jupiter-operation)
(require 'jupiter-nop)
;;; Class jupiter-insert
;;
(defclass jupiter-insert (jupiter-operation
rudel-insert-op)
()
"Objects of this class represent insertions into buffers.")
(defmethod jupiter-transform ((this jupiter-insert) other)
"Transform OTHER using THIS."
(cond
;;
;; Transform an insert operation
;;
((jupiter-insert-p other)
(with-slots ((this-from :from)
(this-to :to)
(this-length :length)
(this-data :data)) this
(with-slots ((other-from :from)
(other-to :to)
(other-length :length)
(other-data :data)) other
(cond
;;
;; <other>
;; <this>
;; No need to do anything in this case.
;; ((< other-from this-from))
;;
;; <other>
;; <this>
;;
((> other-from this-from)
(incf other-from this-length))
;;
;; <other>
;; <this>
;; OTHER inserted at the same start position as we did. Since
;; the situation is symmetric in the location properties of
;; OTHER and THIS, we use the inserted data to construct an
;; ordering.
((= other-from this-from)
(when (string< this-data other-data)
(incf other-from this-length)))))))
;;
;; 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>
;; just keep OTHER
;;
;; <other> and <other> and <other>
;; <this> <this> <this>
((>= other-from this-from)
(incf other-from this-length)
(incf other-to this-length))
;;
;; < other >
;; <this>
;; OTHER deleted a region that includes the point at which THIS
;; inserted in its interior. OTHER has to be split into one
;; deletion before and one delete after the inserted data.
((and (< other-from this-from) (> other-to this-to))
(setq other
(jupiter-compound "compound"
:children (list (jupiter-delete "delete-left"
:from other-from
:to this-from)
(jupiter-delete "delete-right"
:from this-to
:to (+ other-to this-length))))))
))))
;;
;; 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-insert) &rest strings)
"Add from, to, length and data to string representation of THIS."
(with-slots (from to length data) this
(call-next-method
this
(format " from %d" from)
(format " to %d" to)
(format " length %d" length)
(format " data \"%s\"" data)))
)
(provide 'jupiter-insert)
;;; jupiter-insert.el ends here
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