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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 revision
+
+
+;;; Code:
+;;
+
+(require 'eieio)
+
+(require 'rudel-operations)
+(require 'jupiter-operation)
+
+
+;;; 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