external/cffi.darcs/src/features.lisp

   1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
   2 ;;;
   3 ;;; features.lisp --- CFFI-specific features.
   4 ;;;
   5 ;;; Copyright (C) 2006-2007, Luis Oliveira  <loliveira@common-lisp.net>
   6 ;;;
   7 ;;; Permission is hereby granted, free of charge, to any person
   8 ;;; obtaining a copy of this software and associated documentation
   9 ;;; files (the "Software"), to deal in the Software without
  10 ;;; restriction, including without limitation the rights to use, copy,
  11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
  12 ;;; of the Software, and to permit persons to whom the Software is
  13 ;;; furnished to do so, subject to the following conditions:
  14 ;;;
  15 ;;; The above copyright notice and this permission notice shall be
  16 ;;; included in all copies or substantial portions of the Software.
  17 ;;;
  18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 ;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25 ;;; DEALINGS IN THE SOFTWARE.
  26 ;;;
  27
  28 (in-package #:cl-user)
  29
  30 (eval-when (:compile-toplevel :load-toplevel :execute)
  31   (pushnew :cffi *features*))
  32
  33 ;;; CFFI-SYS backends take care of pushing the appropriate features to
  34 ;;; *features*.  See each cffi-*.lisp file.
  35
  36 (defpackage #:cffi-features
  37   (:use #:cl)
  38   (:export
  39    #:cffi-feature-p
  40
  41    ;; Features related to the CFFI-SYS backend.  Why no-*?  This
  42    ;; reflects the hope that these symbols will go away completely
  43    ;; meaning that at some point all lisps will support long-longs,
  44    ;; the foreign-funcall primitive, etc...
  45    #:no-long-long
  46    #:no-foreign-funcall
  47    #:no-stdcall
  48    #:flat-namespace
  49
  50    ;; Only SCL supports long-double...
  51    ;;#:no-long-double
  52
  53    ;; Features related to the operating system.
  54    ;; More should be added.
  55    #:darwin
  56    #:unix
  57    #:windows
  58
  59    ;; Features related to the processor.
  60    ;; More should be added.
  61    #:ppc32
  62    #:x86
  63    #:x86-64
  64    #:sparc
  65    #:sparc64
  66    #:hppa
  67    #:hppa64
  68    ))
  69
  70 (in-package #:cffi-features)
  71
  72 (defun cffi-feature-p (feature-expression)
  73   "Matches a FEATURE-EXPRESSION against those symbols in *FEATURES*
  74 that belong to the CFFI-FEATURES package."
  75   (when (eql feature-expression t)
  76     (return-from cffi-feature-p t))
  77   (let ((features-package (find-package '#:cffi-features)))
  78     (flet ((cffi-feature-eq (name feature-symbol)
  79              (and (eq (symbol-package feature-symbol) features-package)
  80                   (string= name (symbol-name feature-symbol)))))
  81       (etypecase feature-expression
  82         (symbol
  83          (not (null (member (symbol-name feature-expression) *features*
  84                             :test #'cffi-feature-eq))))
  85         (cons
  86          (ecase (first feature-expression)
  87            (:and (every #'cffi-feature-p (rest feature-expression)))
  88            (:or  (some #'cffi-feature-p (rest feature-expression)))
  89            (:not (not (cffi-feature-p (cadr feature-expression))))))))))