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be010748 | 1 | ;;; cl-compat.el --- Common Lisp extensions for GNU Emacs Lisp (compatibility) |
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2 | |
3 | ;; Copyright (C) 1993 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Dave Gillespie <daveg@synaptics.com> | |
6 | ;; Version: 2.02 | |
7 | ;; Keywords: extensions | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
7c938215 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
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14 | ;; any later version. |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
fcd73769 | 25 | |
07b3798c | 26 | ;;; Commentary: |
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27 | |
28 | ;; These are extensions to Emacs Lisp that provide a degree of | |
29 | ;; Common Lisp compatibility, beyond what is already built-in | |
30 | ;; in Emacs Lisp. | |
31 | ;; | |
32 | ;; This package was written by Dave Gillespie; it is a complete | |
33 | ;; rewrite of Cesar Quiroz's original cl.el package of December 1986. | |
34 | ;; | |
35 | ;; This package works with Emacs 18, Emacs 19, and Lucid Emacs 19. | |
36 | ;; | |
37 | ;; Bug reports, comments, and suggestions are welcome! | |
38 | ||
39 | ;; This file contains emulations of internal routines of the older | |
40 | ;; CL package which users may have called directly from their code. | |
41 | ;; Use (require 'cl-compat) to get these routines. | |
42 | ||
43 | ;; See cl.el for Change Log. | |
44 | ||
45 | ||
07b3798c | 46 | ;;; Code: |
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47 | |
48 | ;; Require at load-time, but not when compiling cl-compat. | |
49 | (or (featurep 'cl) (require 'cl)) | |
50 | ||
51 | ||
52 | ;;; Keyword routines not supported by new package. | |
53 | ||
54 | (defmacro defkeyword (x &optional doc) | |
55 | (list* 'defconst x (list 'quote x) (and doc (list doc)))) | |
56 | ||
57 | (defun keywordp (sym) | |
58 | (and (symbolp sym) (eq (aref (symbol-name sym) 0) ?\:) (set sym sym))) | |
59 | ||
60 | (defun keyword-of (sym) | |
61 | (or (keywordp sym) (keywordp (intern (format ":%s" sym))))) | |
62 | ||
63 | ||
64 | ;;; Multiple values. Note that the new package uses a different | |
65 | ;;; convention for multiple values. The following definitions | |
66 | ;;; emulate the old convention; all function names have been changed | |
67 | ;;; by capitalizing the first letter: Values, Multiple-value-*, | |
68 | ;;; to avoid conflict with the new-style definitions in cl-macs. | |
69 | ||
70 | (put 'Multiple-value-bind 'lisp-indent-function 2) | |
71 | (put 'Multiple-value-setq 'lisp-indent-function 2) | |
72 | (put 'Multiple-value-call 'lisp-indent-function 1) | |
73 | (put 'Multiple-value-prog1 'lisp-indent-function 1) | |
74 | ||
75 | (defvar *mvalues-values* nil) | |
76 | ||
77 | (defun Values (&rest val-forms) | |
78 | (setq *mvalues-values* val-forms) | |
79 | (car val-forms)) | |
80 | ||
81 | (defun Values-list (val-forms) | |
82 | (apply 'values val-forms)) | |
83 | ||
84 | (defmacro Multiple-value-list (form) | |
85 | (list 'let* (list '(*mvalues-values* nil) (list '*mvalues-temp* form)) | |
86 | '(or (and (eq *mvalues-temp* (car *mvalues-values*)) *mvalues-values*) | |
87 | (list *mvalues-temp*)))) | |
88 | ||
89 | (defmacro Multiple-value-call (function &rest args) | |
90 | (list 'apply function | |
91 | (cons 'append | |
92 | (mapcar (function (lambda (x) (list 'Multiple-value-list x))) | |
93 | args)))) | |
94 | ||
95 | (defmacro Multiple-value-bind (vars form &rest body) | |
96 | (list* 'multiple-value-bind vars (list 'Multiple-value-list form) body)) | |
97 | ||
98 | (defmacro Multiple-value-setq (vars form) | |
99 | (list 'multiple-value-setq vars (list 'Multiple-value-list form))) | |
100 | ||
101 | (defmacro Multiple-value-prog1 (form &rest body) | |
102 | (list 'prog1 form (list* 'let '((*mvalues-values* nil)) body))) | |
103 | ||
104 | ||
105 | ;;; Routines for parsing keyword arguments. | |
106 | ||
107 | (defun build-klist (arglist keys &optional allow-others) | |
108 | (let ((res (Multiple-value-call 'mapcar* 'cons (unzip-lists arglist)))) | |
109 | (or allow-others | |
110 | (let ((bad (set-difference (mapcar 'car res) keys))) | |
111 | (if bad (error "Bad keywords: %s not in %s" bad keys)))) | |
112 | res)) | |
113 | ||
114 | (defun extract-from-klist (klist key &optional def) | |
115 | (let ((res (assq key klist))) (if res (cdr res) def))) | |
116 | ||
117 | (defun keyword-argument-supplied-p (klist key) | |
118 | (assq key klist)) | |
119 | ||
120 | (defun elt-satisfies-test-p (item elt klist) | |
121 | (let ((test-not (cdr (assq ':test-not klist))) | |
122 | (test (cdr (assq ':test klist))) | |
123 | (key (cdr (assq ':key klist)))) | |
124 | (if key (setq elt (funcall key elt))) | |
125 | (if test-not (not (funcall test-not item elt)) | |
126 | (funcall (or test 'eql) item elt)))) | |
127 | ||
128 | ||
129 | ;;; Rounding functions with old-style multiple value returns. | |
130 | ||
131 | (defun cl-floor (a &optional b) (Values-list (floor* a b))) | |
132 | (defun cl-ceiling (a &optional b) (Values-list (ceiling* a b))) | |
133 | (defun cl-round (a &optional b) (Values-list (round* a b))) | |
134 | (defun cl-truncate (a &optional b) (Values-list (truncate* a b))) | |
135 | ||
136 | (defun safe-idiv (a b) | |
137 | (let* ((q (/ (abs a) (abs b))) | |
138 | (s (* (signum a) (signum b)))) | |
139 | (Values q (- a (* s q b)) s))) | |
140 | ||
141 | ||
142 | ;; Internal routines. | |
143 | ||
144 | (defun pair-with-newsyms (oldforms) | |
145 | (let ((newsyms (mapcar (function (lambda (x) (gensym))) oldforms))) | |
146 | (Values (mapcar* 'list newsyms oldforms) newsyms))) | |
147 | ||
148 | (defun zip-lists (evens odds) | |
149 | (mapcan 'list evens odds)) | |
150 | ||
151 | (defun unzip-lists (list) | |
152 | (let ((e nil) (o nil)) | |
153 | (while list | |
154 | (setq e (cons (car list) e) o (cons (cadr list) o) list (cddr list))) | |
155 | (Values (nreverse e) (nreverse o)))) | |
156 | ||
157 | (defun reassemble-argslists (list) | |
158 | (let ((n (apply 'min (mapcar 'length list))) (res nil)) | |
159 | (while (>= (setq n (1- n)) 0) | |
160 | (setq res (cons (mapcar (function (lambda (x) (elt x n))) list) res))) | |
161 | res)) | |
162 | ||
163 | (defun duplicate-symbols-p (list) | |
164 | (let ((res nil)) | |
165 | (while list | |
166 | (if (memq (car list) (cdr list)) (setq res (cons (car list) res))) | |
167 | (setq list (cdr list))) | |
168 | res)) | |
169 | ||
170 | ||
171 | ;;; Setf internals. | |
172 | ||
173 | (defun setnth (n list x) | |
174 | (setcar (nthcdr n list) x)) | |
175 | ||
176 | (defun setnthcdr (n list x) | |
177 | (setcdr (nthcdr (1- n) list) x)) | |
178 | ||
179 | (defun setelt (seq n x) | |
180 | (if (consp seq) (setcar (nthcdr n seq) x) (aset seq n x))) | |
181 | ||
182 | ||
183 | ;;; Functions omitted: case-clausify, check-do-stepforms, check-do-endforms, | |
184 | ;;; extract-do-inits, extract-do[*]-steps, select-stepping-forms, | |
185 | ;;; elt-satisfies-if[-not]-p, with-keyword-args, mv-bind-clausify, | |
186 | ;;; all names with embedded `$'. | |
187 | ||
188 | ||
189 | (provide 'cl-compat) | |
190 | ||
191 | ;;; cl-compat.el ends here | |
192 |