line.lisp

;;;; Copyright (c) 2003, 2004 Nikodemus Siivola, Julian Squires
;;;;
;;;; Permission is hereby granted, free of charge, to any person obtaining
;;;; a copy of this software and associated documentation files (the
;;;; "Software"), to deal in the Software without restriction, including
;;;; without limitation the rights to use, copy, modify, merge, publish,
;;;; distribute, sublicense, and/or sell copies of the Software, and to
;;;; permit persons to whom the Software is furnished to do so, subject to
;;;; the following conditions:
;;;;
;;;; The above copyright notice and this permission notice shall be included
;;;; in all copies or substantial portions of the Software.
;;;;
;;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
;;;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
;;;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
;;;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
;;;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

(in-package :linedit)

(defclass line ()
  ((string :accessor get-string :initform "" :initarg :string)
   (point :accessor get-point :initform 0 :initarg :point)))

(defmethod (setf get-string) :around (string line)
  (prog1 (call-next-method)
    (when (>= (get-point line) (length string))
      (setf (get-point line) (length string)))))

(defmethod (setf get-point) :around (point line)
  (when (<= 0 point (length (get-string line)))
    (call-next-method)))