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1 ;;; cl-compat.el --- Common Lisp extensions for GNU Emacs Lisp (compatibility)
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2
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3 ;; Copyright (C) 1993 Free Software Foundation, Inc.
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4
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5 ;; Author: Dave Gillespie <daveg@synaptics.com>
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6 ;; Version: 2.02
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7 ;; Keywords: extensions
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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: FSF 19.34.
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27
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28 ;;; Commentary:
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29
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30 ;; These are extensions to Emacs Lisp that provide a degree of
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31 ;; Common Lisp compatibility, beyond what is already built-in
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32 ;; in Emacs Lisp.
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33 ;;
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34 ;; This package was written by Dave Gillespie; it is a complete
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35 ;; rewrite of Cesar Quiroz's original cl.el package of December 1986.
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36 ;;
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37 ;; This package works with Emacs 18, Emacs 19, and XEmacs/Lucid Emacs 19.
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38 ;;
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39 ;; Bug reports, comments, and suggestions are welcome!
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40
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41 ;; This file contains emulations of internal routines of the older
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42 ;; CL package which users may have called directly from their code.
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43 ;; Use (require 'cl-compat) to get these routines.
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44
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45 ;; See cl.el for Change Log.
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46
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47
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48 ;;; Code:
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49
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50 ;; Require at load-time, but not when compiling cl-compat.
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51 (or (featurep 'cl) (require 'cl))
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52
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53
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54 ;;; Keyword routines not supported by new package.
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55
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56 (defmacro defkeyword (x &optional doc)
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57 (list* 'defconst x (list 'quote x) (and doc (list doc))))
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58
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59 (defun keywordp (sym)
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60 (and (symbolp sym) (eq (aref (symbol-name sym) 0) ?\:) (set sym sym)))
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61
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62 (defun keyword-of (sym)
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63 (or (keywordp sym) (keywordp (intern (format ":%s" sym)))))
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64
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65
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66 ;;; Multiple values. Note that the new package uses a different
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67 ;;; convention for multiple values. The following definitions
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68 ;;; emulate the old convention; all function names have been changed
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69 ;;; by capitalizing the first letter: Values, Multiple-value-*,
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70 ;;; to avoid conflict with the new-style definitions in cl-macs.
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71
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72 (put 'Multiple-value-bind 'lisp-indent-function 2)
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73 (put 'Multiple-value-setq 'lisp-indent-function 2)
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74 (put 'Multiple-value-call 'lisp-indent-function 1)
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75 (put 'Multiple-value-prog1 'lisp-indent-function 1)
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76
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77 (defvar *mvalues-values* nil)
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78
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79 (defun Values (&rest val-forms)
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80 (setq *mvalues-values* val-forms)
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81 (car val-forms))
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82
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83 (defun Values-list (val-forms)
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84 (apply 'values val-forms))
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85
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86 (defmacro Multiple-value-list (form)
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87 (list 'let* (list '(*mvalues-values* nil) (list '*mvalues-temp* form))
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88 '(or (and (eq *mvalues-temp* (car *mvalues-values*)) *mvalues-values*)
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89 (list *mvalues-temp*))))
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90
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91 (defmacro Multiple-value-call (function &rest args)
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92 (list 'apply function
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93 (cons 'append
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94 (mapcar (function (lambda (x) (list 'Multiple-value-list x)))
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95 args))))
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96
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97 (defmacro Multiple-value-bind (vars form &rest body)
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98 (list* 'multiple-value-bind vars (list 'Multiple-value-list form) body))
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99
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100 (defmacro Multiple-value-setq (vars form)
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101 (list 'multiple-value-setq vars (list 'Multiple-value-list form)))
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102
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103 (defmacro Multiple-value-prog1 (form &rest body)
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104 (list 'prog1 form (list* 'let '((*mvalues-values* nil)) body)))
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105
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106
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107 ;;; Routines for parsing keyword arguments.
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108
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109 (defun build-klist (arglist keys &optional allow-others)
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110 (let ((res (Multiple-value-call 'mapcar* 'cons (unzip-lists arglist))))
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111 (or allow-others
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112 (let ((bad (set-difference (mapcar 'car res) keys)))
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113 (if bad (error "Bad keywords: %s not in %s" bad keys))))
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114 res))
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115
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116 (defun extract-from-klist (klist key &optional def)
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117 (let ((res (assq key klist))) (if res (cdr res) def)))
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118
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119 (defun keyword-argument-supplied-p (klist key)
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120 (assq key klist))
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121
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122 (defun elt-satisfies-test-p (item elt klist)
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123 (let ((test-not (cdr (assq ':test-not klist)))
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124 (test (cdr (assq ':test klist)))
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125 (key (cdr (assq ':key klist))))
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126 (if key (setq elt (funcall key elt)))
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127 (if test-not (not (funcall test-not item elt))
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128 (funcall (or test 'eql) item elt))))
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129
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130
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131 ;;; Rounding functions with old-style multiple value returns.
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132
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133 (defun cl-floor (a &optional b) (Values-list (floor* a b)))
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134 (defun cl-ceiling (a &optional b) (Values-list (ceiling* a b)))
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135 (defun cl-round (a &optional b) (Values-list (round* a b)))
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136 (defun cl-truncate (a &optional b) (Values-list (truncate* a b)))
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137
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138 (defun safe-idiv (a b)
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139 (let* ((q (/ (abs a) (abs b)))
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140 (s (* (signum a) (signum b))))
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141 (Values q (- a (* s q b)) s)))
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142
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143
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144 ;; Internal routines.
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145
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146 (defun pair-with-newsyms (oldforms)
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147 (let ((newsyms (mapcar (function (lambda (x) (gensym))) oldforms)))
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148 (Values (mapcar* 'list newsyms oldforms) newsyms)))
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149
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150 (defun zip-lists (evens odds)
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151 (mapcan 'list evens odds))
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152
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153 (defun unzip-lists (list)
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154 (let ((e nil) (o nil))
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155 (while list
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156 (setq e (cons (car list) e) o (cons (cadr list) o) list (cddr list)))
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157 (Values (nreverse e) (nreverse o))))
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158
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159 (defun reassemble-argslists (list)
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160 (let ((n (apply 'min (mapcar 'length list))) (res nil))
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161 (while (>= (setq n (1- n)) 0)
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162 (setq res (cons (mapcar (function (lambda (x) (elt x n))) list) res)))
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163 res))
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164
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165 (defun duplicate-symbols-p (list)
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166 (let ((res nil))
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167 (while list
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168 (if (memq (car list) (cdr list)) (setq res (cons (car list) res)))
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169 (setq list (cdr list)))
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170 res))
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171
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172
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173 ;;; Setf internals.
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174
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175 (defun setnth (n list x)
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176 (setcar (nthcdr n list) x))
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177
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178 (defun setnthcdr (n list x)
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179 (setcdr (nthcdr (1- n) list) x))
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180
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181 (defun setelt (seq n x)
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182 (if (consp seq) (setcar (nthcdr n seq) x) (aset seq n x)))
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183
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184
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185 ;;; Functions omitted: case-clausify, check-do-stepforms, check-do-endforms,
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186 ;;; extract-do-inits, extract-do[*]-steps, select-stepping-forms,
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187 ;;; elt-satisfies-if[-not]-p, with-keyword-args, mv-bind-clausify,
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188 ;;; all names with embedded `$'.
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189
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190
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191 (provide 'cl-compat)
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192
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193 ;;; cl-compat.el ends here
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194
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