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1 | ;; cl-compat.el --- Common Lisp extensions for GNU Emacs Lisp (compatibility) |
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 | |
13 | ;; the Free Software Foundation; either version 1, or (at your option) | |
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 | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
23 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | ||
07b3798c | 25 | ;;; Commentary: |
fcd73769 RS |
26 | |
27 | ;; These are extensions to Emacs Lisp that provide a degree of | |
28 | ;; Common Lisp compatibility, beyond what is already built-in | |
29 | ;; in Emacs Lisp. | |
30 | ;; | |
31 | ;; This package was written by Dave Gillespie; it is a complete | |
32 | ;; rewrite of Cesar Quiroz's original cl.el package of December 1986. | |
33 | ;; | |
34 | ;; This package works with Emacs 18, Emacs 19, and Lucid Emacs 19. | |
35 | ;; | |
36 | ;; Bug reports, comments, and suggestions are welcome! | |
37 | ||
38 | ;; This file contains emulations of internal routines of the older | |
39 | ;; CL package which users may have called directly from their code. | |
40 | ;; Use (require 'cl-compat) to get these routines. | |
41 | ||
42 | ;; See cl.el for Change Log. | |
43 | ||
44 | ||
07b3798c | 45 | ;;; Code: |
fcd73769 RS |
46 | |
47 | ;; Require at load-time, but not when compiling cl-compat. | |
48 | (or (featurep 'cl) (require 'cl)) | |
49 | ||
50 | ||
51 | ;;; Keyword routines not supported by new package. | |
52 | ||
53 | (defmacro defkeyword (x &optional doc) | |
54 | (list* 'defconst x (list 'quote x) (and doc (list doc)))) | |
55 | ||
56 | (defun keywordp (sym) | |
57 | (and (symbolp sym) (eq (aref (symbol-name sym) 0) ?\:) (set sym sym))) | |
58 | ||
59 | (defun keyword-of (sym) | |
60 | (or (keywordp sym) (keywordp (intern (format ":%s" sym))))) | |
61 | ||
62 | ||
63 | ;;; Multiple values. Note that the new package uses a different | |
64 | ;;; convention for multiple values. The following definitions | |
65 | ;;; emulate the old convention; all function names have been changed | |
66 | ;;; by capitalizing the first letter: Values, Multiple-value-*, | |
67 | ;;; to avoid conflict with the new-style definitions in cl-macs. | |
68 | ||
69 | (put 'Multiple-value-bind 'lisp-indent-function 2) | |
70 | (put 'Multiple-value-setq 'lisp-indent-function 2) | |
71 | (put 'Multiple-value-call 'lisp-indent-function 1) | |
72 | (put 'Multiple-value-prog1 'lisp-indent-function 1) | |
73 | ||
74 | (defvar *mvalues-values* nil) | |
75 | ||
76 | (defun Values (&rest val-forms) | |
77 | (setq *mvalues-values* val-forms) | |
78 | (car val-forms)) | |
79 | ||
80 | (defun Values-list (val-forms) | |
81 | (apply 'values val-forms)) | |
82 | ||
83 | (defmacro Multiple-value-list (form) | |
84 | (list 'let* (list '(*mvalues-values* nil) (list '*mvalues-temp* form)) | |
85 | '(or (and (eq *mvalues-temp* (car *mvalues-values*)) *mvalues-values*) | |
86 | (list *mvalues-temp*)))) | |
87 | ||
88 | (defmacro Multiple-value-call (function &rest args) | |
89 | (list 'apply function | |
90 | (cons 'append | |
91 | (mapcar (function (lambda (x) (list 'Multiple-value-list x))) | |
92 | args)))) | |
93 | ||
94 | (defmacro Multiple-value-bind (vars form &rest body) | |
95 | (list* 'multiple-value-bind vars (list 'Multiple-value-list form) body)) | |
96 | ||
97 | (defmacro Multiple-value-setq (vars form) | |
98 | (list 'multiple-value-setq vars (list 'Multiple-value-list form))) | |
99 | ||
100 | (defmacro Multiple-value-prog1 (form &rest body) | |
101 | (list 'prog1 form (list* 'let '((*mvalues-values* nil)) body))) | |
102 | ||
103 | ||
104 | ;;; Routines for parsing keyword arguments. | |
105 | ||
106 | (defun build-klist (arglist keys &optional allow-others) | |
107 | (let ((res (Multiple-value-call 'mapcar* 'cons (unzip-lists arglist)))) | |
108 | (or allow-others | |
109 | (let ((bad (set-difference (mapcar 'car res) keys))) | |
110 | (if bad (error "Bad keywords: %s not in %s" bad keys)))) | |
111 | res)) | |
112 | ||
113 | (defun extract-from-klist (klist key &optional def) | |
114 | (let ((res (assq key klist))) (if res (cdr res) def))) | |
115 | ||
116 | (defun keyword-argument-supplied-p (klist key) | |
117 | (assq key klist)) | |
118 | ||
119 | (defun elt-satisfies-test-p (item elt klist) | |
120 | (let ((test-not (cdr (assq ':test-not klist))) | |
121 | (test (cdr (assq ':test klist))) | |
122 | (key (cdr (assq ':key klist)))) | |
123 | (if key (setq elt (funcall key elt))) | |
124 | (if test-not (not (funcall test-not item elt)) | |
125 | (funcall (or test 'eql) item elt)))) | |
126 | ||
127 | ||
128 | ;;; Rounding functions with old-style multiple value returns. | |
129 | ||
130 | (defun cl-floor (a &optional b) (Values-list (floor* a b))) | |
131 | (defun cl-ceiling (a &optional b) (Values-list (ceiling* a b))) | |
132 | (defun cl-round (a &optional b) (Values-list (round* a b))) | |
133 | (defun cl-truncate (a &optional b) (Values-list (truncate* a b))) | |
134 | ||
135 | (defun safe-idiv (a b) | |
136 | (let* ((q (/ (abs a) (abs b))) | |
137 | (s (* (signum a) (signum b)))) | |
138 | (Values q (- a (* s q b)) s))) | |
139 | ||
140 | ||
141 | ;; Internal routines. | |
142 | ||
143 | (defun pair-with-newsyms (oldforms) | |
144 | (let ((newsyms (mapcar (function (lambda (x) (gensym))) oldforms))) | |
145 | (Values (mapcar* 'list newsyms oldforms) newsyms))) | |
146 | ||
147 | (defun zip-lists (evens odds) | |
148 | (mapcan 'list evens odds)) | |
149 | ||
150 | (defun unzip-lists (list) | |
151 | (let ((e nil) (o nil)) | |
152 | (while list | |
153 | (setq e (cons (car list) e) o (cons (cadr list) o) list (cddr list))) | |
154 | (Values (nreverse e) (nreverse o)))) | |
155 | ||
156 | (defun reassemble-argslists (list) | |
157 | (let ((n (apply 'min (mapcar 'length list))) (res nil)) | |
158 | (while (>= (setq n (1- n)) 0) | |
159 | (setq res (cons (mapcar (function (lambda (x) (elt x n))) list) res))) | |
160 | res)) | |
161 | ||
162 | (defun duplicate-symbols-p (list) | |
163 | (let ((res nil)) | |
164 | (while list | |
165 | (if (memq (car list) (cdr list)) (setq res (cons (car list) res))) | |
166 | (setq list (cdr list))) | |
167 | res)) | |
168 | ||
169 | ||
170 | ;;; Setf internals. | |
171 | ||
172 | (defun setnth (n list x) | |
173 | (setcar (nthcdr n list) x)) | |
174 | ||
175 | (defun setnthcdr (n list x) | |
176 | (setcdr (nthcdr (1- n) list) x)) | |
177 | ||
178 | (defun setelt (seq n x) | |
179 | (if (consp seq) (setcar (nthcdr n seq) x) (aset seq n x))) | |
180 | ||
181 | ||
182 | ;;; Functions omitted: case-clausify, check-do-stepforms, check-do-endforms, | |
183 | ;;; extract-do-inits, extract-do[*]-steps, select-stepping-forms, | |
184 | ;;; elt-satisfies-if[-not]-p, with-keyword-args, mv-bind-clausify, | |
185 | ;;; all names with embedded `$'. | |
186 | ||
187 | ||
188 | (provide 'cl-compat) | |
189 | ||
190 | ;;; cl-compat.el ends here | |
191 |