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