1 | ;;; require.lisp |
---|
2 | ;;; |
---|
3 | ;;; Copyright (C) 2003-2005 Peter Graves |
---|
4 | ;;; $Id: require.lisp 14296 2012-12-06 09:23:15Z 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 | (in-package #:system) |
---|
33 | |
---|
34 | ;;; PROVIDE, REQUIRE (from SBCL) |
---|
35 | (defun provide (module-name) |
---|
36 | (pushnew (string module-name) *modules* :test #'string=) |
---|
37 | t) |
---|
38 | |
---|
39 | (defun module-provide-system (module) |
---|
40 | (let ((*readtable* (copy-readtable nil))) |
---|
41 | (handler-case |
---|
42 | (progn |
---|
43 | (load-system-file (string-downcase (string module))) |
---|
44 | (provide module)) |
---|
45 | (t (e) |
---|
46 | (unless (and (typep e 'error) |
---|
47 | (search "Failed to find loadable system file" |
---|
48 | (format nil "~A" e))) |
---|
49 | (format *error-output* "Failed to require ~A because '~A'~%" |
---|
50 | module e)) |
---|
51 | nil)))) |
---|
52 | |
---|
53 | |
---|
54 | (defvar *module-provider-functions* nil) |
---|
55 | |
---|
56 | (defun require (module-name &optional pathnames) |
---|
57 | (unless (member (string module-name) *modules* :test #'string=) |
---|
58 | (let ((saved-modules (copy-list *modules*))) |
---|
59 | (cond |
---|
60 | ;;; Since these are files packaged with the system we ensure that |
---|
61 | ;;; PROVIDE has been called unless the module has other dependencies |
---|
62 | ;;; that must be satisfied to be loaded, which is currently only the |
---|
63 | ;;; case with 'abcl-contrib'. |
---|
64 | (pathnames |
---|
65 | (unless (listp pathnames) (setf pathnames (list pathnames))) |
---|
66 | (dolist (x pathnames) |
---|
67 | (load x)) |
---|
68 | (unless (string-equal module-name "abcl-contrib") |
---|
69 | (provide module-name))) |
---|
70 | ;;; Responsibility for actually calling PROVIDE up to module provider |
---|
71 | ;;; function |
---|
72 | (t |
---|
73 | (unless (some (lambda (p) (funcall p module-name)) |
---|
74 | (append (list #'module-provide-system) |
---|
75 | sys::*module-provider-functions*)) |
---|
76 | (error "Don't know how to ~S ~A." 'require module-name)))) |
---|
77 | (set-difference *modules* saved-modules)))) |
---|
78 | |
---|