mdw@git.distorted.org.uk Git - sod/blob - src/parser/proto-streams.lisp

   1 ;;; -*-lisp-*-
   2 ;;;
   3 ;;; Additional stream protocol.
   4 ;;;
   5 ;;; (c) 2009 Straylight/Edgeware
   6 ;;;
   7
   8 ;;;----- Licensing notice ---------------------------------------------------
   9 ;;;
  10 ;;; This file is part of the Sensble Object Design, an object system for C.
  11 ;;;
  12 ;;; SOD is free software; you can redistribute it and/or modify
  13 ;;; it under the terms of the GNU General Public License as published by
  14 ;;; the Free Software Foundation; either version 2 of the License, or
  15 ;;; (at your option) any later version.
  16 ;;;
  17 ;;; SOD is distributed in the hope that it will be useful,
  18 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;;; GNU General Public License for more details.
  21 ;;;
  22 ;;; You should have received a copy of the GNU General Public License
  23 ;;; along with SOD; if not, write to the Free Software Foundation,
  24 ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 (cl:in-package #:sod-parser)
  27
  28 ;;;--------------------------------------------------------------------------
  29 ;;; Discovery of file names.
  30
  31 (export 'stream-pathname)
  32 (defgeneric stream-pathname (stream)
  33   (:documentation
  34    "Returns the pathname of the file that STREAM is open on.
  35
  36    If STREAM is open on a file, then return the pathname of that file.
  37    Otherwise return NIL.")
  38
  39   ;; Provide some default methods.  Most streams don't have a pathname.
  40   ;; File-based streams provide a pathname, but it's usually been merged with
  41   ;; *DEFAULT-PATHNAME-DEFAULTS* or some such, which has made it absolute,
  42   ;; which isn't ideal.  We'll hack around this in more useful classes later.
  43   (:method ((stream stream)) nil)
  44   (:method ((stream file-stream)) (pathname stream)))
  45
  46 ;;;----- That's all, folks --------------------------------------------------