1 ;;; cl-compat.el --- Common Lisp extensions for GNU Emacs Lisp (compatibility)
3 ;; Copyright (C) 1993 Free Software Foundation, Inc.
5 ;; Author: Dave Gillespie <daveg@synaptics.com>
7 ;; Keywords: extensions
9 ;; This file is part of XEmacs.
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)
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.
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
26 ;;; Synched up with: FSF 19.34.
30 ;; These are extensions to Emacs Lisp that provide a degree of
31 ;; Common Lisp compatibility, beyond what is already built-in
34 ;; This package was written by Dave Gillespie; it is a complete
35 ;; rewrite of Cesar Quiroz's original cl.el package of December 1986.
37 ;; This package works with Emacs 18, Emacs 19, and XEmacs/Lucid Emacs 19.
39 ;; Bug reports, comments, and suggestions are welcome!
41 ;; This file contains emulations of internal routines of the older
42 ;; CL package which users may have called directly from their code.
43 ;; Use (require 'cl-compat) to get these routines.
45 ;; See cl.el for Change Log.
50 ;; Require at load-time, but not when compiling cl-compat.
51 (or (featurep 'cl) (require 'cl))
54 ;;; Keyword routines not supported by new package.
56 (defmacro defkeyword (x &optional doc)
57 (list* 'defconst x (list 'quote x) (and doc (list doc))))
60 ;; We have built-in function.
61 ;;(defun keywordp (sym)
62 ;; (and (symbolp sym) (eq (aref (symbol-name sym) 0) ?\:) (set sym sym)))
64 (defun keyword-of (sym)
65 (or (keywordp sym) (keywordp (intern (format ":%s" sym)))))
68 ;;; Multiple values. Note that the new package uses a different
69 ;;; convention for multiple values. The following definitions
70 ;;; emulate the old convention; all function names have been changed
71 ;;; by capitalizing the first letter: Values, Multiple-value-*,
72 ;;; to avoid conflict with the new-style definitions in cl-macs.
74 (put 'Multiple-value-bind 'lisp-indent-function 2)
75 (put 'Multiple-value-setq 'lisp-indent-function 2)
76 (put 'Multiple-value-call 'lisp-indent-function 1)
77 (put 'Multiple-value-prog1 'lisp-indent-function 1)
79 (defvar *mvalues-values* nil)
81 (defun Values (&rest val-forms)
82 (setq *mvalues-values* val-forms)
85 (defun Values-list (val-forms)
86 (apply 'values val-forms))
88 (defmacro Multiple-value-list (form)
89 (list 'let* (list '(*mvalues-values* nil) (list '*mvalues-temp* form))
90 '(or (and (eq *mvalues-temp* (car *mvalues-values*)) *mvalues-values*)
91 (list *mvalues-temp*))))
93 (defmacro Multiple-value-call (function &rest args)
96 (mapcar (function (lambda (x) (list 'Multiple-value-list x)))
99 (defmacro Multiple-value-bind (vars form &rest body)
100 (list* 'multiple-value-bind vars (list 'Multiple-value-list form) body))
102 (defmacro Multiple-value-setq (vars form)
103 (list 'multiple-value-setq vars (list 'Multiple-value-list form)))
105 (defmacro Multiple-value-prog1 (form &rest body)
106 (list 'prog1 form (list* 'let '((*mvalues-values* nil)) body)))
109 ;;; Routines for parsing keyword arguments.
111 (defun build-klist (arglist keys &optional allow-others)
112 (let ((res (Multiple-value-call 'mapcar* 'cons (unzip-lists arglist))))
114 (let ((bad (set-difference (mapcar 'car res) keys)))
115 (if bad (error "Bad keywords: %s not in %s" bad keys))))
118 (defun extract-from-klist (klist key &optional def)
119 (let ((res (assq key klist))) (if res (cdr res) def)))
121 (defun keyword-argument-supplied-p (klist key)
124 (defun elt-satisfies-test-p (item elt klist)
125 (let ((test-not (cdr (assq ':test-not klist)))
126 (test (cdr (assq ':test klist)))
127 (key (cdr (assq ':key klist))))
128 (if key (setq elt (funcall key elt)))
129 (if test-not (not (funcall test-not item elt))
130 (funcall (or test 'eql) item elt))))
133 ;;; Rounding functions with old-style multiple value returns.
135 (defun cl-floor (a &optional b) (Values-list (floor* a b)))
136 (defun cl-ceiling (a &optional b) (Values-list (ceiling* a b)))
137 (defun cl-round (a &optional b) (Values-list (round* a b)))
138 (defun cl-truncate (a &optional b) (Values-list (truncate* a b)))
140 (defun safe-idiv (a b)
141 (let* ((q (/ (abs a) (abs b)))
142 (s (* (signum a) (signum b))))
143 (Values q (- a (* s q b)) s)))
146 ;; Internal routines.
148 (defun pair-with-newsyms (oldforms)
149 (let ((newsyms (mapcar (function (lambda (x) (gensym))) oldforms)))
150 (Values (mapcar* 'list newsyms oldforms) newsyms)))
152 (defun zip-lists (evens odds)
153 (mapcan 'list evens odds))
155 (defun unzip-lists (list)
156 (let ((e nil) (o nil))
158 (setq e (cons (car list) e) o (cons (cadr list) o) list (cddr list)))
159 (Values (nreverse e) (nreverse o))))
161 (defun reassemble-argslists (list)
162 (let ((n (apply 'min (mapcar 'length list))) (res nil))
163 (while (>= (setq n (1- n)) 0)
164 (setq res (cons (mapcar (function (lambda (x) (elt x n))) list) res)))
167 (defun duplicate-symbols-p (list)
170 (if (memq (car list) (cdr list)) (setq res (cons (car list) res)))
171 (setq list (cdr list)))
177 (defun setnth (n list x)
178 (setcar (nthcdr n list) x))
180 (defun setnthcdr (n list x)
181 (setcdr (nthcdr (1- n) list) x))
183 (defun setelt (seq n x)
184 (if (consp seq) (setcar (nthcdr n seq) x) (aset seq n x)))
187 ;;; Functions omitted: case-clausify, check-do-stepforms, check-do-endforms,
188 ;;; extract-do-inits, extract-do[*]-steps, select-stepping-forms,
189 ;;; elt-satisfies-if[-not]-p, with-keyword-args, mv-bind-clausify,
190 ;;; all names with embedded `$'.
195 ;;; cl-compat.el ends here