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