comparison lisp/very-early-lisp.el @ 304:c6de09ad3017 r21-0b50

Import from CVS: tag r21-0b50
author cvs
date Mon, 13 Aug 2007 10:41:12 +0200
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303:d02ffe1d75ed 304:c6de09ad3017
1 ;;; very-early-lisp.el --- Lisp support always needed by temacs
2
3 ;; Copyright (C) 1998 by Free Software Foundation, Inc.
4
5 ;; Author: SL Baur <steve@altair.xemacs.org>
6 ;; Michael Sperber [Mr. Preprocessor] <sperber@Informatik.Uni-Tuebingen.De>
7 ;; Keywords: internal, dumped
8
9 ;; This file is part of XEmacs.
10
11 ;; XEmacs is free software; you can redistribute it and/or modify it
12 ;; under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
15
16 ;; XEmacs is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
20
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
24 ;; 02111-1307, USA.
25
26 ;;; Synched up with: Not in FSF
27
28 ;;; Commentary:
29
30 ;; This file must be loaded by temacs if temacs is to process bytecode
31 ;; or dumped-lisp.el files.
32
33 ;;; Code:
34
35 (define-function 'defalias 'define-function)
36
37 ;;; Macros from Michael Sperber to replace read-time Lisp reader macros #-, #+
38 ;;; ####fixme duplicated in make-docfile.el and update-elc.el
39 (defmacro assemble-list (&rest components)
40 "Assemble a list from COMPONENTS.
41 This is a poor man's backquote:
42 COMPONENTS is a list, each element of which is macro-expanded.
43 Each macro-expanded element either has the form (SPLICE stuff),
44 in which case stuff must be a list which is spliced into the result.
45 Otherwise, the component becomes an element of the list."
46 (cons
47 'append
48 (mapcar #'(lambda (component)
49 (let ((component (macroexpand-internal component)))
50 (if (and (consp component)
51 (eq 'splice (car component)))
52 (car (cdr component))
53 (list 'list component))))
54 components)))
55
56 (defmacro when-feature (feature stuff)
57 "Insert STUFF as a list element if FEATURE is a loaded feature.
58 This is intended for use as a component of ASSEMBLE-LIST."
59 (list 'splice
60 (if (featurep feature)
61 (list 'list stuff)
62 '())))
63
64 (defmacro unless-feature (feature stuff)
65 "Insert STUFF as a list element if FEATURE is NOT a loaded feature.
66 This is intended for use as a component of ASSEMBLE-LIST."
67 (list 'splice
68 (if (featurep feature)
69 '()
70 (list 'list stuff))))
71
72 (provide 'very-early-lisp)
73
74 ;;; very-early-lisp.el ends here