| 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 -------------------------------------------------- |