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