source: trunk/abcl/src/org/armedbear/lisp/featurep.lisp @ 14879

Last change on this file since 14879 was 14879, checked in by Mark Evenson, 6 years ago

EXT:OS-{UNIX,WINDOWS}-P now provide a pre-ASDF runtime check on hosting platform

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.2 KB
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1;;; featurep.lisp
2;;;
3;;; Copyright (C) 2005 Peter Graves
4;;; $Id: featurep.lisp 14879 2016-09-29 21:39:05Z mevenson $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19;;;
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
31
32;;; Adapted from SBCL.
33
34(in-package #:extensions)
35
36(export 'featurep)
37
38(defun featurep (form)
39  (if (atom form)
40      (not (null (memq form *features*)))
41      (case (car form)
42        ((:not not)
43         (if (cddr form)
44             (error "Too many subexpressions in feature expression: ~S" form)
45             (not (featurep (cadr form)))))
46        ((:and and)
47         (dolist (subform (cdr form) t)
48           (unless (featurep subform) (return))))
49        ((:or or)
50         (dolist (subform (cdr form) nil)
51           (when (featurep subform) (return t))))
52        (t
53         (error "Unknown operator in feature expression: ~S" form)))))
54
55;;;; Cribbed from ASDF 3.1.7; duplicated to establish runtime conditionals before ASDF is constructed
56(defun os-macosx-p ()
57  "Is the underlying operating system MacOS X?"
58  ;; OS-MACOSX is not mutually exclusive with OS-UNIX,
59  ;; in fact the former implies the latter.
60  (featurep '(:or :darwin (:and :allegro :macosx) (:and :clisp :macos))))
61
62(defun os-unix-p ()
63  "Is the underlying operating system some Unix variant?"
64  (or (featurep '(:or :unix :cygwin)) (os-macosx-p)))
65
66(defun os-windows-p ()
67  "Is the underlying operating system Microsoft Windows?"
68  (and (not (os-unix-p)) (featurep '(:or :win32 :windows :mswindows :mingw32 :mingw64))))
69
70(defun os-genera-p ()
71  "Is the underlying operating system Genera (running on a Symbolics Lisp Machine)?"
72  (featurep :genera))
73
74(defun os-oldmac-p ()
75  "Is the underlying operating system an (emulated?) MacOS 9 or earlier?"
76  (featurep :mcl))
77
78(defun os-haiku-p ()
79  "Is the underlying operating system Haiku?"
80  (featurep :haiku))
81
82(export '(os-unix-p os-windows-p))
83
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