src/pcl/gray-streams-class.lisp

   1 ;;;; class definitions for the SBCL Gray streams implementation, based on the
   2 ;;;; CMU CL Gray streams implementation, based on the stream-definition-by-user
   3 ;;;; proposal by David N. Gray
   4
   5 ;;;; This software is part of the SBCL system. See the README file for
   6 ;;;; more information.
   7
   8 ;;;; This software is in the public domain and is provided with absolutely no
   9 ;;;; warranty. See the COPYING and CREDITS files for more information.
  10
  11 (in-package "SB-GRAY")
  12 \f
  13 (defclass fundamental-stream (standard-object stream)
  14   ((open-p :initform t :accessor stream-open-p))
  15   (:documentation "Base class for all Gray streams."))
  16
  17 ;;; Define the stream classes.
  18 (defclass fundamental-input-stream (fundamental-stream) nil
  19   (:documentation "Superclass of all Gray input streams."))
  20
  21 (defclass fundamental-output-stream (fundamental-stream) nil
  22   (:documentation "Superclass of all Gray output streams."))
  23
  24 (defclass fundamental-character-stream (fundamental-stream) nil
  25   (:documentation
  26    "Superclass of all Gray streams whose element-type is a subtype of character."))
  27
  28 (defclass fundamental-binary-stream (fundamental-stream) nil
  29   (:documentation "Superclass of all Gray streams whose element-type
  30 is a subtype of unsigned-byte or signed-byte."))
  31
  32 (defclass fundamental-character-input-stream
  33     (fundamental-input-stream fundamental-character-stream) nil
  34   (:documentation "Superclass of all Gray input streams whose element-type
  35 is a subtype of character."))
  36
  37 (defclass fundamental-character-output-stream
  38     (fundamental-output-stream fundamental-character-stream) nil
  39   (:documentation "Superclass of all Gray output streams whose element-type
  40 is a subtype of character."))
  41
  42 (defclass fundamental-binary-input-stream
  43     (fundamental-input-stream fundamental-binary-stream) nil
  44   (:documentation "Superclass of all Gray input streams whose element-type
  45 is a subtype of unsigned-byte or signed-byte."))
  46
  47 (defclass fundamental-binary-output-stream
  48     (fundamental-output-stream fundamental-binary-stream) nil
  49   (:documentation "Superclass of all Gray output streams whose element-type
  50 is a subtype of unsigned-byte or signed-byte."))
  51 \f
  52 ;;; This is not in the Gray stream proposal, so it is left here
  53 ;;; as example code.
  54 ;;;
  55 ;;; example character input and output streams
  56 #|
  57 (defclass character-output-stream (fundamental-character-output-stream)
  58   ((lisp-stream :initarg :lisp-stream
  59                 :accessor character-output-stream-lisp-stream)))
  60
  61 (defclass character-input-stream (fundamental-character-input-stream)
  62   ((lisp-stream :initarg :lisp-stream
  63                 :accessor character-input-stream-lisp-stream)))
  64 |#