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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Output driver for SOD translator | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
10 | ;;; This file is part of the Simple Object Definition system. | |
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) | |
27 | ||
28 | ;;;-------------------------------------------------------------------------- | |
29 | ;;; Sequencing machinery. | |
30 | ||
31 | (defclass sequencer-item () | |
32 | ((name :initarg :name :reader sequencer-item-name) | |
33 | (functions :initarg :functions :initform nil | |
34 | :type list :accessor sequencer-item-functions)) | |
35 | (:documentation | |
36 | "Represents a distinct item to be sequenced by a SEQUENCER. | |
37 | ||
38 | A SEQUENCER-ITEM maintains a list of FUNCTIONS which are invoked when the | |
39 | sequencer is invoked. This class is not intended to be subclassed.")) | |
40 | ||
41 | ;;;-------------------------------------------------------------------------- | |
42 | ;;; Output preparation. | |
43 | ||
44 | (defvar *seen-announcement*) ;Keep me unbound! | |
45 | #+hmm | |
46 | (defmethod add-output-hooks :around (object reason sequencer &rest stuff) | |
47 | "Arrange not to invoke any object more than once during a particular | |
48 | announcement." | |
49 | (declare (ignore stuff)) | |
50 | (cond ((not (boundp '*seen-announcement*)) | |
51 | (let ((*seen-announcement* (make-hash-table))) | |
52 | (setf (gethash object *seen-announcement*) t) | |
53 | (call-next-method))) | |
54 | ((gethash object *seen-announcement*) | |
55 | nil) | |
56 | (t | |
57 | (setf (gethash object *seen-announcement*) t) | |
58 | (call-next-method)))) | |
59 | ||
60 | ;;;-------------------------------------------------------------------------- | |
61 | ;;; Utility macro. | |
62 | ||
63 | ;;;----- That's all, folks -------------------------------------------------- |