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209
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1 ;;; cl.el --- Common Lisp extensions for GNU Emacs Lisp
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2
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3 ;; Copyright (C) 1993, 1997 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 ;; Maintainer: XEmacs Development Team
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7 ;; Version: 2.02
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8 ;; Keywords: extensions, dumped, lisp
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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25 ;; 02111-1307, USA.
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26
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27 ;;; Synched up with: FSF 19.34.
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28
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29 ;;; Commentary:
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30
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31 ;; This file is dumped with XEmacs.
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32
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33 ;; These are extensions to Emacs Lisp that provide a degree of
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34 ;; Common Lisp compatibility, beyond what is already built-in
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35 ;; in Emacs Lisp.
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36 ;;
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37 ;; This package was written by Dave Gillespie; it is a complete
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38 ;; rewrite of Cesar Quiroz's original cl.el package of December 1986.
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39 ;;
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40 ;; This package works with Emacs 18, Emacs 19, and XEmacs/Lucid Emacs 19.
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41 ;;
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42 ;; Bug reports, comments, and suggestions are welcome!
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43
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44 ;; This file contains the portions of the Common Lisp extensions
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45 ;; package which should always be present.
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46
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47
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48 ;;; Future notes:
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49
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50 ;; Once Emacs 19 becomes standard, many things in this package which are
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51 ;; messy for reasons of compatibility can be greatly simplified. For now,
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52 ;; I prefer to maintain one unified version.
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53
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54
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55 ;;; Change Log:
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56
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57 ;; Version 2.02 (30 Jul 93):
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58 ;; * Added "cl-compat.el" file, extra compatibility with old package.
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59 ;; * Added `lexical-let' and `lexical-let*'.
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60 ;; * Added `define-modify-macro', `callf', and `callf2'.
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61 ;; * Added `ignore-errors'.
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62 ;; * Changed `(setf (nthcdr N PLACE) X)' to work when N is zero.
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63 ;; * Merged `*gentemp-counter*' into `*gensym-counter*'.
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64 ;; * Extended `subseq' to allow negative START and END like `substring'.
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65 ;; * Added `in-ref', `across-ref', `elements of-ref' loop clauses.
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66 ;; * Added `concat', `vconcat' loop clauses.
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67 ;; * Cleaned up a number of compiler warnings.
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68
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69 ;; Version 2.01 (7 Jul 93):
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70 ;; * Added support for FSF version of Emacs 19.
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71 ;; * Added `add-hook' for Emacs 18 users.
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72 ;; * Added `defsubst*' and `symbol-macrolet'.
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73 ;; * Added `maplist', `mapc', `mapl', `mapcan', `mapcon'.
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74 ;; * Added `map', `concatenate', `reduce', `merge'.
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75 ;; * Added `revappend', `nreconc', `tailp', `tree-equal'.
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76 ;; * Added `assert', `check-type', `typecase', `typep', and `deftype'.
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77 ;; * Added destructuring and `&environment' support to `defmacro*'.
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78 ;; * Added destructuring to `loop', and added the following clauses:
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79 ;; `elements', `frames', `overlays', `intervals', `buffers', `key-seqs'.
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80 ;; * Renamed `delete' to `delete*' and `remove' to `remove*'.
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81 ;; * Completed support for all keywords in `remove*', `substitute', etc.
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82 ;; * Added `most-positive-float' and company.
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83 ;; * Fixed hash tables to work with latest Lucid Emacs.
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84 ;; * `proclaim' forms are no longer compile-time-evaluating; use `declaim'.
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85 ;; * Syntax for `warn' declarations has changed.
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86 ;; * Improved implementation of `random*'.
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87 ;; * Moved most sequence functions to a new file, cl-seq.el.
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88 ;; * Moved `eval-when' into cl-macs.el.
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89 ;; * Moved `pushnew' and `adjoin' to cl.el for most common cases.
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90 ;; * Moved `provide' forms down to ends of files.
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91 ;; * Changed expansion of `pop' to something that compiles to better code.
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92 ;; * Changed so that no patch is required for Emacs 19 byte compiler.
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93 ;; * Made more things dependent on `optimize' declarations.
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94 ;; * Added a partial implementation of struct print functions.
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95 ;; * Miscellaneous minor changes.
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96
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97 ;; Version 2.00:
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98 ;; * First public release of this package.
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99
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100
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101 ;;; Code:
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102
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103 (defvar cl-emacs-type (cond ((or (and (fboundp 'epoch::version)
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104 (symbol-value 'epoch::version))
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105 (string-lessp emacs-version "19")) 18)
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106 ((string-match "XEmacs" emacs-version)
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107 'lucid)
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108 (t 19)))
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109
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110 (or (fboundp 'defalias) (fset 'defalias 'fset))
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111
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112 (defvar cl-optimize-speed 1)
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113 (defvar cl-optimize-safety 1)
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114
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115
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116 ;;; Keywords used in this package.
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117
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118 ;;; XEmacs - keywords are done in Fintern().
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119 ;;;
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120 ;;; (defconst :test ':test)
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121 ;;; (defconst :test-not ':test-not)
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122 ;;; (defconst :key ':key)
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123 ;;; (defconst :start ':start)
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124 ;;; (defconst :start1 ':start1)
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125 ;;; (defconst :start2 ':start2)
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126 ;;; (defconst :end ':end)
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127 ;;; (defconst :end1 ':end1)
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128 ;;; (defconst :end2 ':end2)
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129 ;;; (defconst :count ':count)
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130 ;;; (defconst :initial-value ':initial-value)
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131 ;;; (defconst :size ':size)
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132 ;;; (defconst :from-end ':from-end)
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133 ;;; (defconst :rehash-size ':rehash-size)
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134 ;;; (defconst :rehash-threshold ':rehash-threshold)
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135 ;;; (defconst :allow-other-keys ':allow-other-keys)
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136
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137
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138 (defvar custom-print-functions nil
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139 "This is a list of functions that format user objects for printing.
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140 Each function is called in turn with three arguments: the object, the
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141 stream, and the print level (currently ignored). If it is able to
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142 print the object it returns true; otherwise it returns nil and the
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143 printer proceeds to the next function on the list.
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144
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145 This variable is not used at present, but it is defined in hopes that
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146 a future Emacs interpreter will be able to use it.")
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147
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148
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149 ;;; Predicates.
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150
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151 (defun eql (a b) ; See compiler macro in cl-macs.el
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272
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152 "Return t if the two args are the same Lisp object.
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209
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153 Floating-point numbers of equal value are `eql', but they may not be `eq'."
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227
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154 (if (floatp a)
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209
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155 (equal a b)
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156 (eq a b)))
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157
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158
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159 ;;; Generalized variables. These macros are defined here so that they
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160 ;;; can safely be used in .emacs files.
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161
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162 (defmacro incf (place &optional x)
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163 "(incf PLACE [X]): increment PLACE by X (1 by default).
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164 PLACE may be a symbol, or any generalized variable allowed by `setf'.
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165 The return value is the incremented value of PLACE."
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166 (if (symbolp place)
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167 (list 'setq place (if x (list '+ place x) (list '1+ place)))
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227
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168 ;; XEmacs byte-compiler optimizes (+ FOO 1) to (1+ FOO), so this
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169 ;; is OK.
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209
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170 (list 'callf '+ place (or x 1))))
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171
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172 (defmacro decf (place &optional x)
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173 "(decf PLACE [X]): decrement PLACE by X (1 by default).
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174 PLACE may be a symbol, or any generalized variable allowed by `setf'.
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175 The return value is the decremented value of PLACE."
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176 (if (symbolp place)
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177 (list 'setq place (if x (list '- place x) (list '1- place)))
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178 (list 'callf '- place (or x 1))))
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179
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180 (defmacro pop (place)
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181 "(pop PLACE): remove and return the head of the list stored in PLACE.
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182 Analogous to (prog1 (car PLACE) (setf PLACE (cdr PLACE))), though more
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183 careful about evaluating each argument only once and in the right order.
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184 PLACE may be a symbol, or any generalized variable allowed by `setf'."
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185 (if (symbolp place)
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380
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186 `(car (prog1 ,place (setq ,place (cdr ,place))))
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209
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187 (cl-do-pop place)))
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188
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189 (defmacro push (x place)
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190 "(push X PLACE): insert X at the head of the list stored in PLACE.
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191 Analogous to (setf PLACE (cons X PLACE)), though more careful about
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192 evaluating each argument only once and in the right order. PLACE may
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193 be a symbol, or any generalized variable allowed by `setf'."
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380
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194 (if (symbolp place) `(setq ,place (cons ,x ,place))
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209
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195 (list 'callf2 'cons x place)))
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196
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197 (defmacro pushnew (x place &rest keys)
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198 "(pushnew X PLACE): insert X at the head of the list if not already there.
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199 Like (push X PLACE), except that the list is unmodified if X is `eql' to
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200 an element already on the list.
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201 Keywords supported: :test :test-not :key"
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202 (if (symbolp place) (list 'setq place (list* 'adjoin x place keys))
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203 (list* 'callf2 'adjoin x place keys)))
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204
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205 (defun cl-set-elt (seq n val)
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206 (if (listp seq) (setcar (nthcdr n seq) val) (aset seq n val)))
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207
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208 (defun cl-set-nthcdr (n list x)
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209 (if (<= n 0) x (setcdr (nthcdr (1- n) list) x) list))
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210
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211 (defun cl-set-buffer-substring (start end val)
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212 (save-excursion (delete-region start end)
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213 (goto-char start)
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214 (insert val)
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215 val))
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216
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217 (defun cl-set-substring (str start end val)
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218 (if end (if (< end 0) (incf end (length str)))
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219 (setq end (length str)))
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220 (if (< start 0) (incf start str))
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221 (concat (and (> start 0) (substring str 0 start))
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222 val
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223 (and (< end (length str)) (substring str end))))
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224
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225
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226 ;;; Control structures.
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227
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380
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228 ;; The macros `when' and `unless' are so useful that we want them to
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229 ;; ALWAYS be available. So they've been moved from cl.el to eval.c.
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230 ;; Note: FSF Emacs moved them to subr.el in FSF 20.
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209
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231
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232 (defun cl-map-extents (&rest cl-args)
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227
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233 ;; XEmacs: This used to check for overlays first, but that's wrong
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234 ;; because of the new compatibility library. *duh*
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235 (cond ((fboundp 'map-extents)
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236 (apply 'map-extents cl-args))
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237 ((fboundp 'next-overlay-at)
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238 (apply 'cl-map-overlays cl-args))))
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209
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239
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240
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241 ;;; Blocks and exits.
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242
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243 (defalias 'cl-block-wrapper 'identity)
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244 (defalias 'cl-block-throw 'throw)
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245
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246
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247 ;;; Multiple values. True multiple values are not supported, or even
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248 ;;; simulated. Instead, multiple-value-bind and friends simply expect
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249 ;;; the target form to return the values as a list.
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250
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251 (defalias 'values 'list)
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252 (defalias 'values-list 'identity)
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253 (defalias 'multiple-value-list 'identity)
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254 (defalias 'multiple-value-call 'apply) ; only works for one arg
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255 (defalias 'nth-value 'nth)
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256
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257
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258 ;;; Macros.
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259
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260 (defvar cl-macro-environment nil)
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261 ;; XEmacs: we renamed the internal function to macroexpand-internal
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262 ;; to avoid doc-file problems.
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263 (defvar cl-old-macroexpand (prog1 (symbol-function 'macroexpand-internal)
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264 (defalias 'macroexpand 'cl-macroexpand)))
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265
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266 (defun cl-macroexpand (cl-macro &optional cl-env)
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267 "Return result of expanding macros at top level of FORM.
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268 If FORM is not a macro call, it is returned unchanged.
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269 Otherwise, the macro is expanded and the expansion is considered
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270 in place of FORM. When a non-macro-call results, it is returned.
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271
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371
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272 The second optional arg ENVIRONMENT species an environment of macro
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209
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273 definitions to shadow the loaded ones for use in file byte-compilation."
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274 (let ((cl-macro-environment cl-env))
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275 (while (progn (setq cl-macro (funcall cl-old-macroexpand cl-macro cl-env))
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276 (and (symbolp cl-macro)
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277 (cdr (assq (symbol-name cl-macro) cl-env))))
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278 (setq cl-macro (cadr (assq (symbol-name cl-macro) cl-env))))
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279 cl-macro))
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280
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281
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282 ;;; Declarations.
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283
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284 (defvar cl-compiling-file nil)
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285 (defun cl-compiling-file ()
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286 (or cl-compiling-file
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287 ;; XEmacs change
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288 ; (and (boundp 'outbuffer) (bufferp (symbol-value 'outbuffer))
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289 ; (equal (buffer-name (symbol-value 'outbuffer))
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290 ; " *Compiler Output*"))
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291 (and (boundp 'byte-compile-outbuffer)
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292 (bufferp (symbol-value 'byte-compile-outbuffer))
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293 (equal (buffer-name (symbol-value 'byte-compile-outbuffer))
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294 " *Compiler Output*"))
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295 ))
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296
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297 (defvar cl-proclaims-deferred nil)
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298
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299 (defun proclaim (spec)
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300 (if (fboundp 'cl-do-proclaim) (cl-do-proclaim spec t)
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301 (push spec cl-proclaims-deferred))
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302 nil)
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303
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304 (defmacro declaim (&rest specs)
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305 (let ((body (mapcar (function (lambda (x) (list 'proclaim (list 'quote x))))
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306 specs)))
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307 (if (cl-compiling-file) (list* 'eval-when '(compile load eval) body)
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308 (cons 'progn body)))) ; avoid loading cl-macs.el for eval-when
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309
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310
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311 ;;; Symbols.
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312
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313 (defun cl-random-time ()
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314 (let* ((time (copy-sequence (current-time-string))) (i (length time)) (v 0))
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315 (while (>= (decf i) 0) (setq v (+ (* v 3) (aref time i))))
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316 v))
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317
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318 (defvar *gensym-counter* (* (logand (cl-random-time) 1023) 100))
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319
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320
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321 ;;; Numbers.
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322
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323 (defun floatp-safe (x)
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272
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324 "Return t if OBJECT is a floating point number.
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209
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325 On Emacs versions that lack floating-point support, this function
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326 always returns nil."
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227
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327 ;;(and (numberp x) (not (integerp x)))
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328 ;; XEmacs: use floatp. XEmacs is always compiled with
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329 ;; floating-point, anyway.
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330 (floatp x))
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209
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331
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332 (defun plusp (x)
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272
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333 "Return t if NUMBER is positive."
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209
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334 (> x 0))
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335
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336 (defun minusp (x)
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272
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337 "Return t if NUMBER is negative."
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209
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338 (< x 0))
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339
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340 (defun oddp (x)
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272
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341 "Return t if INTEGER is odd."
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209
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342 (eq (logand x 1) 1))
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343
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344 (defun evenp (x)
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272
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345 "Return t if INTEGER is even."
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209
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346 (eq (logand x 1) 0))
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347
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348 (defun cl-abs (x)
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349 "Return the absolute value of ARG."
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350 (if (>= x 0) x (- x)))
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351 (or (fboundp 'abs) (defalias 'abs 'cl-abs)) ; This is built-in to Emacs 19
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352
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353 (defvar *random-state* (vector 'cl-random-state-tag -1 30 (cl-random-time)))
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354
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355 ;;; We use `eval' in case VALBITS differs from compile-time to load-time.
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284
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356 (defconst most-positive-fixnum (eval '(lsh -1 -1))
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357 "The integer closest in value to positive infinity.")
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358 (defconst most-negative-fixnum (eval '(- -1 (lsh -1 -1)))
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359 "The integer closest in value to negative infinity.")
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209
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360
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284
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361 ;;; The following are set by code in cl-extra.el
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362 (defconst most-positive-float nil
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363 "The float closest in value to positive infinity.")
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364 (defconst most-negative-float nil
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365 "The float closest in value to negative infinity.")
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366 (defconst least-positive-float nil
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367 "The positive float closest in value to 0.")
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|
368 (defconst least-negative-float nil
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|
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369 "The negative float closest in value to 0.")
|
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209
|
370 (defconst least-positive-normalized-float nil)
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|
|
371 (defconst least-negative-normalized-float nil)
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|
|
372 (defconst float-epsilon nil)
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373 (defconst float-negative-epsilon nil)
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374
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375
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|
376 ;;; Sequence functions.
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377
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|
378 (defalias 'copy-seq 'copy-sequence)
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379
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|
380 (defun mapcar* (cl-func cl-x &rest cl-rest)
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|
381 "Apply FUNCTION to each element of SEQ, and make a list of the results.
|
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382 If there are several SEQs, FUNCTION is called with that many arguments,
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383 and mapping stops as soon as the shortest list runs out. With just one
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|
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384 SEQ, this is like `mapcar'. With several, it is like the Common Lisp
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|
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385 `mapcar' function extended to arbitrary sequence types."
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|
386 (if cl-rest
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387 (if (or (cdr cl-rest) (nlistp cl-x) (nlistp (car cl-rest)))
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388 (cl-mapcar-many cl-func (cons cl-x cl-rest))
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389 (let ((cl-res nil) (cl-y (car cl-rest)))
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390 (while (and cl-x cl-y)
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391 (push (funcall cl-func (pop cl-x) (pop cl-y)) cl-res))
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|
392 (nreverse cl-res)))
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393 (mapcar cl-func cl-x)))
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394
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395
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|
|
396 ;;; List functions.
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397
|
|
380
|
398 ;; These functions are made known to the byte-compiler by cl-macs.el
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|
|
399 ;; and turned into efficient car and cdr bytecodes.
|
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|
400
|
|
209
|
401 (defalias 'first 'car)
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|
|
402 (defalias 'rest 'cdr)
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|
403 (defalias 'endp 'null)
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|
|
404
|
|
|
405 (defun second (x)
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|
|
406 "Return the second element of the list LIST."
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|
|
407 (car (cdr x)))
|
|
|
408
|
|
|
409 (defun third (x)
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|
|
410 "Return the third element of the list LIST."
|
|
|
411 (car (cdr (cdr x))))
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|
|
412
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|
|
413 (defun fourth (x)
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|
|
414 "Return the fourth element of the list LIST."
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|
|
415 (nth 3 x))
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|
416
|
|
|
417 (defun fifth (x)
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|
|
418 "Return the fifth element of the list LIST."
|
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|
419 (nth 4 x))
|
|
|
420
|
|
|
421 (defun sixth (x)
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|
|
422 "Return the sixth element of the list LIST."
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|
|
423 (nth 5 x))
|
|
|
424
|
|
|
425 (defun seventh (x)
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|
|
426 "Return the seventh element of the list LIST."
|
|
|
427 (nth 6 x))
|
|
|
428
|
|
|
429 (defun eighth (x)
|
|
|
430 "Return the eighth element of the list LIST."
|
|
|
431 (nth 7 x))
|
|
|
432
|
|
|
433 (defun ninth (x)
|
|
|
434 "Return the ninth element of the list LIST."
|
|
|
435 (nth 8 x))
|
|
|
436
|
|
|
437 (defun tenth (x)
|
|
|
438 "Return the tenth element of the list LIST."
|
|
|
439 (nth 9 x))
|
|
|
440
|
|
|
441 (defun caar (x)
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|
|
442 "Return the `car' of the `car' of X."
|
|
|
443 (car (car x)))
|
|
|
444
|
|
|
445 (defun cadr (x)
|
|
|
446 "Return the `car' of the `cdr' of X."
|
|
|
447 (car (cdr x)))
|
|
|
448
|
|
|
449 (defun cdar (x)
|
|
|
450 "Return the `cdr' of the `car' of X."
|
|
|
451 (cdr (car x)))
|
|
|
452
|
|
|
453 (defun cddr (x)
|
|
|
454 "Return the `cdr' of the `cdr' of X."
|
|
|
455 (cdr (cdr x)))
|
|
|
456
|
|
|
457 (defun caaar (x)
|
|
|
458 "Return the `car' of the `car' of the `car' of X."
|
|
|
459 (car (car (car x))))
|
|
|
460
|
|
|
461 (defun caadr (x)
|
|
|
462 "Return the `car' of the `car' of the `cdr' of X."
|
|
|
463 (car (car (cdr x))))
|
|
|
464
|
|
|
465 (defun cadar (x)
|
|
|
466 "Return the `car' of the `cdr' of the `car' of X."
|
|
|
467 (car (cdr (car x))))
|
|
|
468
|
|
|
469 (defun caddr (x)
|
|
|
470 "Return the `car' of the `cdr' of the `cdr' of X."
|
|
|
471 (car (cdr (cdr x))))
|
|
|
472
|
|
|
473 (defun cdaar (x)
|
|
|
474 "Return the `cdr' of the `car' of the `car' of X."
|
|
|
475 (cdr (car (car x))))
|
|
|
476
|
|
|
477 (defun cdadr (x)
|
|
|
478 "Return the `cdr' of the `car' of the `cdr' of X."
|
|
|
479 (cdr (car (cdr x))))
|
|
|
480
|
|
|
481 (defun cddar (x)
|
|
|
482 "Return the `cdr' of the `cdr' of the `car' of X."
|
|
|
483 (cdr (cdr (car x))))
|
|
|
484
|
|
|
485 (defun cdddr (x)
|
|
|
486 "Return the `cdr' of the `cdr' of the `cdr' of X."
|
|
|
487 (cdr (cdr (cdr x))))
|
|
|
488
|
|
|
489 (defun caaaar (x)
|
|
|
490 "Return the `car' of the `car' of the `car' of the `car' of X."
|
|
|
491 (car (car (car (car x)))))
|
|
|
492
|
|
|
493 (defun caaadr (x)
|
|
|
494 "Return the `car' of the `car' of the `car' of the `cdr' of X."
|
|
|
495 (car (car (car (cdr x)))))
|
|
|
496
|
|
|
497 (defun caadar (x)
|
|
|
498 "Return the `car' of the `car' of the `cdr' of the `car' of X."
|
|
|
499 (car (car (cdr (car x)))))
|
|
|
500
|
|
|
501 (defun caaddr (x)
|
|
|
502 "Return the `car' of the `car' of the `cdr' of the `cdr' of X."
|
|
|
503 (car (car (cdr (cdr x)))))
|
|
|
504
|
|
|
505 (defun cadaar (x)
|
|
|
506 "Return the `car' of the `cdr' of the `car' of the `car' of X."
|
|
|
507 (car (cdr (car (car x)))))
|
|
|
508
|
|
|
509 (defun cadadr (x)
|
|
|
510 "Return the `car' of the `cdr' of the `car' of the `cdr' of X."
|
|
|
511 (car (cdr (car (cdr x)))))
|
|
|
512
|
|
|
513 (defun caddar (x)
|
|
|
514 "Return the `car' of the `cdr' of the `cdr' of the `car' of X."
|
|
|
515 (car (cdr (cdr (car x)))))
|
|
|
516
|
|
|
517 (defun cadddr (x)
|
|
|
518 "Return the `car' of the `cdr' of the `cdr' of the `cdr' of X."
|
|
|
519 (car (cdr (cdr (cdr x)))))
|
|
|
520
|
|
|
521 (defun cdaaar (x)
|
|
|
522 "Return the `cdr' of the `car' of the `car' of the `car' of X."
|
|
|
523 (cdr (car (car (car x)))))
|
|
|
524
|
|
|
525 (defun cdaadr (x)
|
|
|
526 "Return the `cdr' of the `car' of the `car' of the `cdr' of X."
|
|
|
527 (cdr (car (car (cdr x)))))
|
|
|
528
|
|
|
529 (defun cdadar (x)
|
|
|
530 "Return the `cdr' of the `car' of the `cdr' of the `car' of X."
|
|
|
531 (cdr (car (cdr (car x)))))
|
|
|
532
|
|
|
533 (defun cdaddr (x)
|
|
|
534 "Return the `cdr' of the `car' of the `cdr' of the `cdr' of X."
|
|
|
535 (cdr (car (cdr (cdr x)))))
|
|
|
536
|
|
|
537 (defun cddaar (x)
|
|
|
538 "Return the `cdr' of the `cdr' of the `car' of the `car' of X."
|
|
|
539 (cdr (cdr (car (car x)))))
|
|
|
540
|
|
|
541 (defun cddadr (x)
|
|
|
542 "Return the `cdr' of the `cdr' of the `car' of the `cdr' of X."
|
|
|
543 (cdr (cdr (car (cdr x)))))
|
|
|
544
|
|
|
545 (defun cdddar (x)
|
|
|
546 "Return the `cdr' of the `cdr' of the `cdr' of the `car' of X."
|
|
|
547 (cdr (cdr (cdr (car x)))))
|
|
|
548
|
|
|
549 (defun cddddr (x)
|
|
|
550 "Return the `cdr' of the `cdr' of the `cdr' of the `cdr' of X."
|
|
|
551 (cdr (cdr (cdr (cdr x)))))
|
|
|
552
|
|
380
|
553 ;;; `last' is implemented as a C primitive, as of 1998-11
|
|
|
554
|
|
|
555 ;(defun last (x &optional n)
|
|
|
556 ; "Return the last link in the list LIST.
|
|
|
557 ;With optional argument N, return Nth-to-last link (default 1)."
|
|
|
558 ; (if n
|
|
|
559 ; (let ((m 0) (p x))
|
|
|
560 ; (while (consp p) (incf m) (pop p))
|
|
|
561 ; (if (<= n 0) p
|
|
|
562 ; (if (< n m) (nthcdr (- m n) x) x)))
|
|
|
563 ; (while (consp (cdr x)) (pop x))
|
|
|
564 ; x))
|
|
209
|
565
|
|
380
|
566 ;;; `butlast' is implemented as a C primitive, as of 1998-11
|
|
|
567 ;;; `nbutlast' is implemented as a C primitive, as of 1998-11
|
|
|
568
|
|
|
569 ;(defun butlast (x &optional n)
|
|
|
570 ; "Return a copy of LIST with the last N elements removed."
|
|
|
571 ; (if (and n (<= n 0)) x
|
|
|
572 ; (nbutlast (copy-sequence x) n)))
|
|
209
|
573
|
|
380
|
574 ;(defun nbutlast (x &optional n)
|
|
|
575 ; "Modify LIST to remove the last N elements."
|
|
|
576 ; (let ((m (length x)))
|
|
|
577 ; (or n (setq n 1))
|
|
|
578 ; (and (< n m)
|
|
|
579 ; (progn
|
|
|
580 ; (if (> n 0) (setcdr (nthcdr (- (1- m) n) x) nil))
|
|
|
581 ; x))))
|
|
209
|
582
|
|
|
583 (defun list* (arg &rest rest) ; See compiler macro in cl-macs.el
|
|
|
584 "Return a new list with specified args as elements, cons'd to last arg.
|
|
|
585 Thus, `(list* A B C D)' is equivalent to `(nconc (list A B C) D)', or to
|
|
|
586 `(cons A (cons B (cons C D)))'."
|
|
|
587 (cond ((not rest) arg)
|
|
|
588 ((not (cdr rest)) (cons arg (car rest)))
|
|
|
589 (t (let* ((n (length rest))
|
|
|
590 (copy (copy-sequence rest))
|
|
|
591 (last (nthcdr (- n 2) copy)))
|
|
|
592 (setcdr last (car (cdr last)))
|
|
|
593 (cons arg copy)))))
|
|
|
594
|
|
|
595 (defun ldiff (list sublist)
|
|
|
596 "Return a copy of LIST with the tail SUBLIST removed."
|
|
|
597 (let ((res nil))
|
|
|
598 (while (and (consp list) (not (eq list sublist)))
|
|
|
599 (push (pop list) res))
|
|
|
600 (nreverse res)))
|
|
|
601
|
|
380
|
602 ;;; `copy-list' is implemented as a C primitive, as of 1998-11
|
|
|
603
|
|
|
604 ;(defun copy-list (list)
|
|
|
605 ; "Return a copy of a list, which may be a dotted list.
|
|
|
606 ;The elements of the list are not copied, just the list structure itself."
|
|
|
607 ; (if (consp list)
|
|
|
608 ; (let ((res nil))
|
|
|
609 ; (while (consp list) (push (pop list) res))
|
|
|
610 ; (prog1 (nreverse res) (setcdr res list)))
|
|
|
611 ; (car list)))
|
|
209
|
612
|
|
|
613 (defun cl-maclisp-member (item list)
|
|
|
614 (while (and list (not (equal item (car list)))) (setq list (cdr list)))
|
|
|
615 list)
|
|
|
616
|
|
|
617 ;;; Define an Emacs 19-compatible `member' for the benefit of Emacs 18 users.
|
|
|
618 (or (and (fboundp 'member) (subrp (symbol-function 'member)))
|
|
|
619 (defalias 'member 'cl-maclisp-member))
|
|
|
620
|
|
|
621 (defalias 'cl-member 'memq) ; for compatibility with old CL package
|
|
|
622 (defalias 'cl-floor 'floor*)
|
|
|
623 (defalias 'cl-ceiling 'ceiling*)
|
|
|
624 (defalias 'cl-truncate 'truncate*)
|
|
|
625 (defalias 'cl-round 'round*)
|
|
|
626 (defalias 'cl-mod 'mod*)
|
|
|
627
|
|
|
628 (defun adjoin (cl-item cl-list &rest cl-keys) ; See compiler macro in cl-macs
|
|
|
629 "Return ITEM consed onto the front of LIST only if it's not already there.
|
|
|
630 Otherwise, return LIST unmodified.
|
|
|
631 Keywords supported: :test :test-not :key"
|
|
|
632 (cond ((or (equal cl-keys '(:test eq))
|
|
|
633 (and (null cl-keys) (not (numberp cl-item))))
|
|
|
634 (if (memq cl-item cl-list) cl-list (cons cl-item cl-list)))
|
|
|
635 ((or (equal cl-keys '(:test equal)) (null cl-keys))
|
|
|
636 (if (member cl-item cl-list) cl-list (cons cl-item cl-list)))
|
|
|
637 (t (apply 'cl-adjoin cl-item cl-list cl-keys))))
|
|
|
638
|
|
|
639 (defun subst (cl-new cl-old cl-tree &rest cl-keys)
|
|
|
640 "Substitute NEW for OLD everywhere in TREE (non-destructively).
|
|
|
641 Return a copy of TREE with all elements `eql' to OLD replaced by NEW.
|
|
|
642 Keywords supported: :test :test-not :key"
|
|
|
643 (if (or cl-keys (and (numberp cl-old) (not (integerp cl-old))))
|
|
|
644 (apply 'sublis (list (cons cl-old cl-new)) cl-tree cl-keys)
|
|
|
645 (cl-do-subst cl-new cl-old cl-tree)))
|
|
|
646
|
|
|
647 (defun cl-do-subst (cl-new cl-old cl-tree)
|
|
|
648 (cond ((eq cl-tree cl-old) cl-new)
|
|
|
649 ((consp cl-tree)
|
|
|
650 (let ((a (cl-do-subst cl-new cl-old (car cl-tree)))
|
|
|
651 (d (cl-do-subst cl-new cl-old (cdr cl-tree))))
|
|
|
652 (if (and (eq a (car cl-tree)) (eq d (cdr cl-tree)))
|
|
|
653 cl-tree (cons a d))))
|
|
|
654 (t cl-tree)))
|
|
|
655
|
|
272
|
656 (defun acons (a b c)
|
|
|
657 "Return a new alist created by adding (KEY . VALUE) to ALIST."
|
|
|
658 (cons (cons a b) c))
|
|
|
659
|
|
209
|
660 (defun pairlis (a b &optional c) (nconc (mapcar* 'cons a b) c))
|
|
|
661
|
|
|
662
|
|
|
663 ;;; Miscellaneous.
|
|
|
664
|
|
|
665 ;; XEmacs change
|
|
|
666 (define-error 'cl-assertion-failed "Assertion failed")
|
|
|
667
|
|
|
668 ;;; This is defined in Emacs 19; define it here for Emacs 18 users.
|
|
|
669 (defun cl-add-hook (hook func &optional append)
|
|
|
670 "Add to hook variable HOOK the function FUNC.
|
|
|
671 FUNC is not added if it already appears on the list stored in HOOK."
|
|
|
672 (let ((old (and (boundp hook) (symbol-value hook))))
|
|
|
673 (and (listp old) (not (eq (car old) 'lambda))
|
|
|
674 (setq old (list old)))
|
|
|
675 (and (not (member func old))
|
|
|
676 (set hook (if append (nconc old (list func)) (cons func old))))))
|
|
|
677 (or (fboundp 'add-hook) (defalias 'add-hook 'cl-add-hook))
|
|
|
678
|
|
|
679 ;; XEmacs change
|
|
|
680 ;(load "cl-defs")
|
|
|
681
|
|
|
682 ;;; Define data for indentation and edebug.
|
|
380
|
683 (mapc
|
|
|
684 #'(lambda (entry)
|
|
|
685 (mapc
|
|
|
686 #'(lambda (func)
|
|
|
687 (put func 'lisp-indent-function (nth 1 entry))
|
|
|
688 (put func 'lisp-indent-hook (nth 1 entry))
|
|
|
689 (or (get func 'edebug-form-spec)
|
|
|
690 (put func 'edebug-form-spec (nth 2 entry))))
|
|
|
691 (car entry)))
|
|
|
692 '(((defun* defmacro*) defun)
|
|
|
693 ((function*) nil
|
|
|
694 (&or symbolp ([&optional 'macro] 'lambda (&rest sexp) &rest form)))
|
|
|
695 ((eval-when) 1 (sexp &rest form))
|
|
|
696 ((when unless) 1 (&rest form))
|
|
|
697 ((declare) nil (&rest sexp))
|
|
|
698 ((the) 1 (sexp &rest form))
|
|
|
699 ((case ecase typecase etypecase) 1 (form &rest (sexp &rest form)))
|
|
|
700 ((block return-from) 1 (sexp &rest form))
|
|
|
701 ((return) nil (&optional form))
|
|
|
702 ((do do*) 2 ((&rest &or symbolp (symbolp &optional form form))
|
|
|
703 (form &rest form)
|
|
|
704 &rest form))
|
|
|
705 ((dolist dotimes) 1 ((symbolp form &rest form) &rest form))
|
|
|
706 ((do-symbols) 1 ((symbolp form &optional form form) &rest form))
|
|
|
707 ((do-all-symbols) 1 ((symbolp form &optional form) &rest form))
|
|
|
708 ((psetq setf psetf) nil edebug-setq-form)
|
|
|
709 ((progv) 2 (&rest form))
|
|
|
710 ((flet labels macrolet) 1
|
|
|
711 ((&rest (sexp sexp &rest form)) &rest form))
|
|
|
712 ((symbol-macrolet lexical-let lexical-let*) 1
|
|
|
713 ((&rest &or symbolp (symbolp form)) &rest form))
|
|
|
714 ((multiple-value-bind) 2 ((&rest symbolp) &rest form))
|
|
|
715 ((multiple-value-setq) 1 ((&rest symbolp) &rest form))
|
|
|
716 ((incf decf remf pop push pushnew shiftf rotatef) nil (&rest form))
|
|
|
717 ((letf letf*) 1 ((&rest (&rest form)) &rest form))
|
|
|
718 ((callf destructuring-bind) 2 (sexp form &rest form))
|
|
|
719 ((callf2) 3 (sexp form form &rest form))
|
|
|
720 ((loop) defun (&rest &or symbolp form))
|
|
|
721 ((ignore-errors) 0 (&rest form))))
|
|
209
|
722
|
|
|
723
|
|
|
724 ;;; This goes here so that cl-macs can find it if it loads right now.
|
|
|
725 (provide 'cl-19) ; usage: (require 'cl-19 "cl")
|
|
|
726
|
|
|
727
|
|
|
728 ;;; Things to do after byte-compiler is loaded.
|
|
|
729 ;;; As a side effect, we cause cl-macs to be loaded when compiling, so
|
|
|
730 ;;; that the compiler-macros defined there will be present.
|
|
|
731
|
|
|
732 (defvar cl-hacked-flag nil)
|
|
|
733 (defun cl-hack-byte-compiler ()
|
|
|
734 (if (and (not cl-hacked-flag) (fboundp 'byte-compile-file-form))
|
|
|
735 (progn
|
|
|
736 (cl-compile-time-init) ; in cl-macs.el
|
|
|
737 (setq cl-hacked-flag t))))
|
|
|
738
|
|
|
739 ;;; Try it now in case the compiler has already been loaded.
|
|
|
740 (cl-hack-byte-compiler)
|
|
|
741
|
|
|
742 ;;; Also make a hook in case compiler is loaded after this file.
|
|
|
743 ;;; The compiler doesn't call any hooks when it loads or runs, but
|
|
|
744 ;;; we can take advantage of the fact that emacs-lisp-mode will be
|
|
|
745 ;;; called when the compiler reads in the file to be compiled.
|
|
|
746 ;;; BUG: If the first compilation is `byte-compile' rather than
|
|
|
747 ;;; `byte-compile-file', we lose. Oh, well.
|
|
|
748 (add-hook 'emacs-lisp-mode-hook 'cl-hack-byte-compiler)
|
|
|
749
|
|
|
750
|
|
|
751 ;;; The following ensures that packages which expect the old-style cl.el
|
|
|
752 ;;; will be happy with this one.
|
|
|
753
|
|
|
754 (provide 'cl)
|
|
|
755
|
|
|
756 (provide 'mini-cl) ; for Epoch
|
|
|
757
|
|
|
758 (run-hooks 'cl-load-hook)
|
|
|
759
|
|
|
760 ;;; cl.el ends here
|
