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428
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1 ;;; subr.el --- basic lisp subroutines for XEmacs
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2
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3 ;; Copyright (C) 1985, 1986, 1992, 1994-5, 1997 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
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5 ;; Copyright (C) 1995 Sun Microsystems.
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563
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6 ;; Copyright (C) 2000, 2001 Ben Wing.
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428
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7
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8 ;; Maintainer: XEmacs Development Team
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9 ;; Keywords: extensions, dumped
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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25 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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26 ;; 02111-1307, USA.
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27
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28 ;;; Synched up with: FSF 19.34.
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29
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30 ;;; Commentary:
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31
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32 ;; This file is dumped with XEmacs.
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33
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34 ;; There's not a whole lot in common now with the FSF version,
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35 ;; be wary when applying differences. I've left in a number of lines
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36 ;; of commentary just to give diff(1) something to synch itself with to
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37 ;; provide useful context diffs. -sb
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38
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39 ;;; Code:
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40
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41
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42 ;;;; Lisp language features.
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43
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44 (defmacro lambda (&rest cdr)
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45 "Return a lambda expression.
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46 A call of the form (lambda ARGS DOCSTRING INTERACTIVE BODY) is
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47 self-quoting; the result of evaluating the lambda expression is the
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48 expression itself. The lambda expression may then be treated as a
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49 function, i.e., stored as the function value of a symbol, passed to
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50 funcall or mapcar, etc.
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51
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52 ARGS should take the same form as an argument list for a `defun'.
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53 DOCSTRING is an optional documentation string.
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54 If present, it should describe how to call the function.
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55 But documentation strings are usually not useful in nameless functions.
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56 INTERACTIVE should be a call to the function `interactive', which see.
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57 It may also be omitted.
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58 BODY should be a list of lisp expressions."
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59 `(function (lambda ,@cdr)))
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60
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61 (defmacro defun-when-void (&rest args)
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62 "Define a function, just like `defun', unless it's already defined.
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63 Used for compatibility among different emacs variants."
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64 `(if (fboundp ',(car args))
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65 nil
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66 (defun ,@args)))
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67
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68 (defmacro define-function-when-void (&rest args)
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69 "Define a function, just like `define-function', unless it's already defined.
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70 Used for compatibility among different emacs variants."
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71 `(if (fboundp ,(car args))
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72 nil
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73 (define-function ,@args)))
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74
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75
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76 ;;;; Keymap support.
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77 ;; XEmacs: removed to keymap.el
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78
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79 ;;;; The global keymap tree.
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80
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81 ;;; global-map, esc-map, and ctl-x-map have their values set up in
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82 ;;; keymap.c; we just give them docstrings here.
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83
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84 ;;;; Event manipulation functions.
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85
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86 ;; XEmacs: This stuff is done in C Code.
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87
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88 ;;;; Obsolescent names for functions.
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89 ;; XEmacs: not used.
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90
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91 ;; XEmacs:
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92 (defun local-variable-if-set-p (sym buffer)
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93 "Return t if SYM would be local to BUFFER after it is set.
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94 A nil value for BUFFER is *not* the same as (current-buffer), but
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95 can be used to determine whether `make-variable-buffer-local' has been
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96 called on SYM."
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97 (local-variable-p sym buffer t))
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98
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99
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100 ;;;; Hook manipulation functions.
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101
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102 ;; (defconst run-hooks 'run-hooks ...)
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103
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104 (defun make-local-hook (hook)
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105 "Make the hook HOOK local to the current buffer.
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106 When a hook is local, its local and global values
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107 work in concert: running the hook actually runs all the hook
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108 functions listed in *either* the local value *or* the global value
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109 of the hook variable.
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110
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111 This function works by making `t' a member of the buffer-local value,
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112 which acts as a flag to run the hook functions in the default value as
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113 well. This works for all normal hooks, but does not work for most
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114 non-normal hooks yet. We will be changing the callers of non-normal
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115 hooks so that they can handle localness; this has to be done one by
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116 one.
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117
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118 This function does nothing if HOOK is already local in the current
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119 buffer.
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120
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442
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121 Do not use `make-local-variable' to make a hook variable buffer-local.
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122
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123 See also `add-local-hook' and `remove-local-hook'."
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428
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124 (if (local-variable-p hook (current-buffer)) ; XEmacs
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125 nil
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126 (or (boundp hook) (set hook nil))
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127 (make-local-variable hook)
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128 (set hook (list t))))
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129
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130 (defun add-hook (hook function &optional append local)
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131 "Add to the value of HOOK the function FUNCTION.
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132 FUNCTION is not added if already present.
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133 FUNCTION is added (if necessary) at the beginning of the hook list
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134 unless the optional argument APPEND is non-nil, in which case
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135 FUNCTION is added at the end.
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136
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137 The optional fourth argument, LOCAL, if non-nil, says to modify
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138 the hook's buffer-local value rather than its default value.
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139 This makes no difference if the hook is not buffer-local.
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140 To make a hook variable buffer-local, always use
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141 `make-local-hook', not `make-local-variable'.
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142
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143 HOOK should be a symbol, and FUNCTION may be any valid function. If
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144 HOOK is void, it is first set to nil. If HOOK's value is a single
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442
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145 function, it is changed to a list of functions.
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146
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147 You can remove this hook yourself using `remove-hook'.
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148
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149 See also `add-local-hook' and `add-one-shot-hook'."
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428
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150 (or (boundp hook) (set hook nil))
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151 (or (default-boundp hook) (set-default hook nil))
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152 ;; If the hook value is a single function, turn it into a list.
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153 (let ((old (symbol-value hook)))
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154 (if (or (not (listp old)) (eq (car old) 'lambda))
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155 (set hook (list old))))
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156 (if (or local
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157 ;; Detect the case where make-local-variable was used on a hook
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158 ;; and do what we used to do.
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159 (and (local-variable-if-set-p hook (current-buffer)) ; XEmacs
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160 (not (memq t (symbol-value hook)))))
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161 ;; Alter the local value only.
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162 (or (if (consp function)
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163 (member function (symbol-value hook))
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164 (memq function (symbol-value hook)))
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165 (set hook
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166 (if append
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167 (append (symbol-value hook) (list function))
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168 (cons function (symbol-value hook)))))
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169 ;; Alter the global value (which is also the only value,
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170 ;; if the hook doesn't have a local value).
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171 (or (if (consp function)
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172 (member function (default-value hook))
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173 (memq function (default-value hook)))
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174 (set-default hook
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175 (if append
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176 (append (default-value hook) (list function))
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177 (cons function (default-value hook)))))))
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178
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179 (defun remove-hook (hook function &optional local)
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180 "Remove from the value of HOOK the function FUNCTION.
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181 HOOK should be a symbol, and FUNCTION may be any valid function. If
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182 FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
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183 list of hooks to run in HOOK, then nothing is done. See `add-hook'.
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184
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185 The optional third argument, LOCAL, if non-nil, says to modify
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186 the hook's buffer-local value rather than its default value.
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187 This makes no difference if the hook is not buffer-local.
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188 To make a hook variable buffer-local, always use
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189 `make-local-hook', not `make-local-variable'."
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190 (if (or (not (boundp hook)) ;unbound symbol, or
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191 (not (default-boundp 'hook))
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192 (null (symbol-value hook)) ;value is nil, or
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193 (null function)) ;function is nil, then
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194 nil ;Do nothing.
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442
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195 (flet ((hook-remove
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196 (function hook-value)
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197 (flet ((hook-test
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198 (fn hel)
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199 (or (equal fn hel)
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200 (and (symbolp hel)
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201 (equal fn
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202 (get hel 'one-shot-hook-fun))))))
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203 (if (and (consp hook-value)
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204 (not (functionp hook-value)))
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205 (if (member* function hook-value :test 'hook-test)
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206 (setq hook-value
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207 (delete* function (copy-sequence hook-value)
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208 :test 'hook-test)))
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209 (if (equal hook-value function)
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210 (setq hook-value nil)))
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211 hook-value)))
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212 (if (or local
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213 ;; Detect the case where make-local-variable was used on a hook
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214 ;; and do what we used to do.
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215 (and (local-variable-p hook (current-buffer))
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216 (not (memq t (symbol-value hook)))))
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217 (set hook (hook-remove function (symbol-value hook)))
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218 (set-default hook (hook-remove function (default-value hook)))))))
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219
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220 ;; XEmacs addition
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221 ;; #### we need a coherent scheme for indicating compatibility info,
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222 ;; so that it can be programmatically retrieved.
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223 (defun add-local-hook (hook function &optional append)
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224 "Add to the local value of HOOK the function FUNCTION.
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225 This modifies only the buffer-local value for the hook (which is
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226 automatically make buffer-local, if necessary), not its default value.
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227 FUNCTION is not added if already present.
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228 FUNCTION is added (if necessary) at the beginning of the hook list
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229 unless the optional argument APPEND is non-nil, in which case
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230 FUNCTION is added at the end.
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231
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232 HOOK should be a symbol, and FUNCTION may be any valid function. If
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233 HOOK is void, it is first set to nil. If HOOK's value is a single
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234 function, it is changed to a list of functions.
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235
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236 You can remove this hook yourself using `remove-local-hook'.
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237
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238 See also `add-hook' and `make-local-hook'."
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239 (make-local-hook hook)
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240 (add-hook hook function append t))
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241
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242 ;; XEmacs addition
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243 (defun remove-local-hook (hook function)
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244 "Remove from the local value of HOOK the function FUNCTION.
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245 This modifies only the buffer-local value for the hook, not its default
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246 value. (Nothing happens if the hook is not buffer-local.)
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247 HOOK should be a symbol, and FUNCTION may be any valid function. If
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248 FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
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249 list of hooks to run in HOOK, then nothing is done. See `add-hook'.
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250
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251 See also `add-local-hook' and `make-local-hook'."
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252 (if (local-variable-p hook (current-buffer))
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253 (remove-hook hook function t)))
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254
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255 (defun add-one-shot-hook (hook function &optional append local)
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256 "Add to the value of HOOK the one-shot function FUNCTION.
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257 FUNCTION will automatically be removed from the hook the first time
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258 after it runs (whether to completion or to an error).
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259 FUNCTION is not added if already present.
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260 FUNCTION is added (if necessary) at the beginning of the hook list
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261 unless the optional argument APPEND is non-nil, in which case
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262 FUNCTION is added at the end.
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263
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264 HOOK should be a symbol, and FUNCTION may be any valid function. If
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265 HOOK is void, it is first set to nil. If HOOK's value is a single
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266 function, it is changed to a list of functions.
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267
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268 You can remove this hook yourself using `remove-hook'.
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269
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270 See also `add-hook', `add-local-hook', and `add-local-one-shot-hook'."
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271 (let ((sym (gensym)))
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272 (fset sym `(lambda (&rest args)
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273 (unwind-protect
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274 (apply ',function args)
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275 (remove-hook ',hook ',sym ',local))))
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276 (put sym 'one-shot-hook-fun function)
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277 (add-hook hook sym append local)))
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278
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279 (defun add-local-one-shot-hook (hook function &optional append)
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280 "Add to the local value of HOOK the one-shot function FUNCTION.
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281 FUNCTION will automatically be removed from the hook the first time
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282 after it runs (whether to completion or to an error).
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283 FUNCTION is not added if already present.
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284 FUNCTION is added (if necessary) at the beginning of the hook list
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285 unless the optional argument APPEND is non-nil, in which case
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286 FUNCTION is added at the end.
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287
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288 The optional fourth argument, LOCAL, if non-nil, says to modify
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289 the hook's buffer-local value rather than its default value.
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290 This makes no difference if the hook is not buffer-local.
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291 To make a hook variable buffer-local, always use
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292 `make-local-hook', not `make-local-variable'.
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293
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294 HOOK should be a symbol, and FUNCTION may be any valid function. If
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295 HOOK is void, it is first set to nil. If HOOK's value is a single
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296 function, it is changed to a list of functions.
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297
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298 You can remove this hook yourself using `remove-local-hook'.
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299
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300 See also `add-hook', `add-local-hook', and `add-local-one-shot-hook'."
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301 (make-local-hook hook)
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302 (add-one-shot-hook hook function append t))
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428
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303
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304 (defun add-to-list (list-var element)
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305 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
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306 The test for presence of ELEMENT is done with `equal'.
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307 If you want to use `add-to-list' on a variable that is not defined
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308 until a certain package is loaded, you should put the call to `add-to-list'
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309 into a hook function that will be run only after loading the package.
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310 `eval-after-load' provides one way to do this. In some cases
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311 other hooks, such as major mode hooks, can do the job."
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312 (or (member element (symbol-value list-var))
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313 (set list-var (cons element (symbol-value list-var)))))
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314
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315 ;; XEmacs additions
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316 ;; called by Fkill_buffer()
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317 (defvar kill-buffer-hook nil
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318 "Function or functions to be called when a buffer is killed.
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319 The value of this variable may be buffer-local.
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320 The buffer about to be killed is current when this hook is run.")
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321
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322 ;; in C in FSFmacs
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323 (defvar kill-emacs-hook nil
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324 "Function or functions to be called when `kill-emacs' is called,
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325 just before emacs is actually killed.")
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326
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327 ;; not obsolete.
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328 ;; #### These are a bad idea, because the CL RPLACA and RPLACD
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329 ;; return the cons cell, not the new CAR/CDR. -hniksic
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330 ;; The proper definition would be:
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331 ;; (defun rplaca (conscell newcar)
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332 ;; (setcar conscell newcar)
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333 ;; conscell)
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334 ;; ...and analogously for RPLACD.
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335 (define-function 'rplaca 'setcar)
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336 (define-function 'rplacd 'setcdr)
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337
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338 (defun copy-symbol (symbol &optional copy-properties)
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339 "Return a new uninterned symbol with the same name as SYMBOL.
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340 If COPY-PROPERTIES is non-nil, the new symbol will have a copy of
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341 SYMBOL's value, function, and property lists."
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342 (let ((new (make-symbol (symbol-name symbol))))
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343 (when copy-properties
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344 ;; This will not copy SYMBOL's chain of forwarding objects, but
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345 ;; I think that's OK. Callers should not expect such magic to
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346 ;; keep working in the copy in the first place.
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347 (and (boundp symbol)
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348 (set new (symbol-value symbol)))
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349 (and (fboundp symbol)
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350 (fset new (symbol-function symbol)))
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351 (setplist new (copy-list (symbol-plist symbol))))
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352 new))
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353
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442
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354 (defun set-symbol-value-in-buffer (sym val buffer)
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355 "Set the value of SYM to VAL in BUFFER. Useful with buffer-local variables.
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356 If SYM has a buffer-local value in BUFFER, or will have one if set, this
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357 function allows you to set the local value.
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358
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359 NOTE: At some point, this will be moved into C and will be very fast."
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360 (with-current-buffer buffer
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361 (set sym val)))
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444
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362
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428
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363 ;;;; String functions.
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364
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365 ;; XEmacs
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366 (defun replace-in-string (str regexp newtext &optional literal)
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367 "Replace all matches in STR for REGEXP with NEWTEXT string,
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368 and returns the new string.
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369 Optional LITERAL non-nil means do a literal replacement.
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442
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370 Otherwise treat `\\' in NEWTEXT as special:
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371 `\\&' in NEWTEXT means substitute original matched text.
|
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|
372 `\\N' means substitute what matched the Nth `\\(...\\)'.
|
|
|
373 If Nth parens didn't match, substitute nothing.
|
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|
374 `\\\\' means insert one `\\'.
|
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|
375 `\\u' means upcase the next character.
|
|
|
376 `\\l' means downcase the next character.
|
|
|
377 `\\U' means begin upcasing all following characters.
|
|
|
378 `\\L' means begin downcasing all following characters.
|
|
|
379 `\\E' means terminate the effect of any `\\U' or `\\L'."
|
|
428
|
380 (check-argument-type 'stringp str)
|
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|
381 (check-argument-type 'stringp newtext)
|
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442
|
382 (if (> (length str) 50)
|
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|
383 (with-temp-buffer
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|
384 (insert str)
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385 (goto-char 1)
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386 (while (re-search-forward regexp nil t)
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387 (replace-match newtext t literal))
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|
388 (buffer-string))
|
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|
389 (let ((start 0) newstr)
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|
390 (while (string-match regexp str start)
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391 (setq newstr (replace-match newtext t literal str)
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392 start (+ (match-end 0) (- (length newstr) (length str)))
|
|
|
393 str newstr))
|
|
|
394 str)))
|
|
428
|
395
|
|
|
396 (defun split-string (string &optional pattern)
|
|
|
397 "Return a list of substrings of STRING which are separated by PATTERN.
|
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|
398 If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
|
|
|
399 (or pattern
|
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|
400 (setq pattern "[ \f\t\n\r\v]+"))
|
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|
401 (let (parts (start 0) (len (length string)))
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402 (if (string-match pattern string)
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403 (setq parts (cons (substring string 0 (match-beginning 0)) parts)
|
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404 start (match-end 0)))
|
|
|
405 (while (and (< start len)
|
|
|
406 (string-match pattern string (if (> start (match-beginning 0))
|
|
|
407 start
|
|
|
408 (1+ start))))
|
|
|
409 (setq parts (cons (substring string start (match-beginning 0)) parts)
|
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|
410 start (match-end 0)))
|
|
|
411 (nreverse (cons (substring string start) parts))))
|
|
|
412
|
|
|
413 ;; #### #### #### AAaargh! Must be in C, because it is used insanely
|
|
|
414 ;; early in the bootstrap process.
|
|
|
415 ;(defun split-path (path)
|
|
|
416 ; "Explode a search path into a list of strings.
|
|
|
417 ;The path components are separated with the characters specified
|
|
|
418 ;with `path-separator'."
|
|
|
419 ; (while (or (not stringp path-separator)
|
|
|
420 ; (/= (length path-separator) 1))
|
|
|
421 ; (setq path-separator (signal 'error (list "\
|
|
|
422 ;`path-separator' should be set to a single-character string"
|
|
|
423 ; path-separator))))
|
|
|
424 ; (split-string-by-char path (aref separator 0)))
|
|
|
425
|
|
|
426 (defmacro with-output-to-string (&rest forms)
|
|
|
427 "Collect output to `standard-output' while evaluating FORMS and return
|
|
|
428 it as a string."
|
|
|
429 ;; by "William G. Dubuque" <wgd@zurich.ai.mit.edu> w/ mods from Stig
|
|
442
|
430 `(with-current-buffer (get-buffer-create
|
|
|
431 (generate-new-buffer-name " *string-output*"))
|
|
428
|
432 (setq buffer-read-only nil)
|
|
|
433 (buffer-disable-undo (current-buffer))
|
|
|
434 (erase-buffer)
|
|
|
435 (let ((standard-output (current-buffer)))
|
|
|
436 ,@forms)
|
|
|
437 (prog1
|
|
|
438 (buffer-string)
|
|
|
439 (erase-buffer))))
|
|
|
440
|
|
|
441 (defmacro with-current-buffer (buffer &rest body)
|
|
|
442 "Temporarily make BUFFER the current buffer and execute the forms in BODY.
|
|
|
443 The value returned is the value of the last form in BODY.
|
|
|
444 See also `with-temp-buffer'."
|
|
|
445 `(save-current-buffer
|
|
|
446 (set-buffer ,buffer)
|
|
|
447 ,@body))
|
|
|
448
|
|
444
|
449 (defmacro with-temp-file (filename &rest forms)
|
|
|
450 "Create a new buffer, evaluate FORMS there, and write the buffer to FILENAME.
|
|
428
|
451 The value of the last form in FORMS is returned, like `progn'.
|
|
|
452 See also `with-temp-buffer'."
|
|
|
453 (let ((temp-file (make-symbol "temp-file"))
|
|
|
454 (temp-buffer (make-symbol "temp-buffer")))
|
|
444
|
455 `(let ((,temp-file ,filename)
|
|
428
|
456 (,temp-buffer
|
|
|
457 (get-buffer-create (generate-new-buffer-name " *temp file*"))))
|
|
|
458 (unwind-protect
|
|
|
459 (prog1
|
|
|
460 (with-current-buffer ,temp-buffer
|
|
|
461 ,@forms)
|
|
|
462 (with-current-buffer ,temp-buffer
|
|
|
463 (widen)
|
|
|
464 (write-region (point-min) (point-max) ,temp-file nil 0)))
|
|
|
465 (and (buffer-name ,temp-buffer)
|
|
|
466 (kill-buffer ,temp-buffer))))))
|
|
|
467
|
|
|
468 (defmacro with-temp-buffer (&rest forms)
|
|
|
469 "Create a temporary buffer, and evaluate FORMS there like `progn'.
|
|
|
470 See also `with-temp-file' and `with-output-to-string'."
|
|
|
471 (let ((temp-buffer (make-symbol "temp-buffer")))
|
|
|
472 `(let ((,temp-buffer
|
|
|
473 (get-buffer-create (generate-new-buffer-name " *temp*"))))
|
|
|
474 (unwind-protect
|
|
|
475 (with-current-buffer ,temp-buffer
|
|
|
476 ,@forms)
|
|
|
477 (and (buffer-name ,temp-buffer)
|
|
|
478 (kill-buffer ,temp-buffer))))))
|
|
|
479
|
|
|
480 ;; Moved from mule-coding.el.
|
|
|
481 (defmacro with-string-as-buffer-contents (str &rest body)
|
|
|
482 "With the contents of the current buffer being STR, run BODY.
|
|
|
483 Returns the new contents of the buffer, as modified by BODY.
|
|
|
484 The original current buffer is restored afterwards."
|
|
442
|
485 `(with-temp-buffer
|
|
|
486 (insert ,str)
|
|
|
487 ,@body
|
|
|
488 (buffer-string)))
|
|
428
|
489
|
|
|
490 (defun insert-face (string face)
|
|
|
491 "Insert STRING and highlight with FACE. Return the extent created."
|
|
|
492 (let ((p (point)) ext)
|
|
|
493 (insert string)
|
|
|
494 (setq ext (make-extent p (point)))
|
|
|
495 (set-extent-face ext face)
|
|
|
496 ext))
|
|
|
497
|
|
|
498 ;; not obsolete.
|
|
|
499 (define-function 'string= 'string-equal)
|
|
|
500 (define-function 'string< 'string-lessp)
|
|
|
501 (define-function 'int-to-string 'number-to-string)
|
|
|
502 (define-function 'string-to-int 'string-to-number)
|
|
|
503
|
|
|
504 ;; These two names are a bit awkward, as they conflict with the normal
|
|
|
505 ;; foo-to-bar naming scheme, but CLtL2 has them, so they stay.
|
|
|
506 (define-function 'char-int 'char-to-int)
|
|
|
507 (define-function 'int-char 'int-to-char)
|
|
|
508
|
|
771
|
509 (defun string-width (string)
|
|
|
510 "Return number of columns STRING occupies when displayed.
|
|
|
511 With international (Mule) support, uses the charset-columns attribute of
|
|
|
512 the characters in STRING, which may not accurately represent the actual
|
|
|
513 display width when using a window system. With no international support,
|
|
|
514 simply returns the length of the string."
|
|
|
515 (if (featurep 'mule)
|
|
|
516 (let ((col 0)
|
|
|
517 (len (length string))
|
|
|
518 (i 0))
|
|
|
519 (while (< i len)
|
|
|
520 (setq col (+ col (charset-width (char-charset (aref string i)))))
|
|
|
521 (setq i (1+ i)))
|
|
|
522 col)
|
|
|
523 (length string)))
|
|
|
524
|
|
428
|
525
|
|
|
526 ;; alist/plist functions
|
|
|
527 (defun plist-to-alist (plist)
|
|
|
528 "Convert property list PLIST into the equivalent association-list form.
|
|
|
529 The alist is returned. This converts from
|
|
|
530
|
|
|
531 \(a 1 b 2 c 3)
|
|
|
532
|
|
|
533 into
|
|
|
534
|
|
|
535 \((a . 1) (b . 2) (c . 3))
|
|
|
536
|
|
|
537 The original plist is not modified. See also `destructive-plist-to-alist'."
|
|
|
538 (let (alist)
|
|
|
539 (while plist
|
|
|
540 (setq alist (cons (cons (car plist) (cadr plist)) alist))
|
|
|
541 (setq plist (cddr plist)))
|
|
|
542 (nreverse alist)))
|
|
|
543
|
|
|
544 (defun destructive-plist-to-alist (plist)
|
|
|
545 "Convert property list PLIST into the equivalent association-list form.
|
|
|
546 The alist is returned. This converts from
|
|
|
547
|
|
|
548 \(a 1 b 2 c 3)
|
|
|
549
|
|
|
550 into
|
|
|
551
|
|
|
552 \((a . 1) (b . 2) (c . 3))
|
|
|
553
|
|
|
554 The original plist is destroyed in the process of constructing the alist.
|
|
|
555 See also `plist-to-alist'."
|
|
|
556 (let ((head plist)
|
|
|
557 next)
|
|
|
558 (while plist
|
|
|
559 ;; remember the next plist pair.
|
|
|
560 (setq next (cddr plist))
|
|
|
561 ;; make the cons holding the property value into the alist element.
|
|
|
562 (setcdr (cdr plist) (cadr plist))
|
|
|
563 (setcar (cdr plist) (car plist))
|
|
|
564 ;; reattach into alist form.
|
|
|
565 (setcar plist (cdr plist))
|
|
|
566 (setcdr plist next)
|
|
|
567 (setq plist next))
|
|
|
568 head))
|
|
|
569
|
|
|
570 (defun alist-to-plist (alist)
|
|
|
571 "Convert association list ALIST into the equivalent property-list form.
|
|
|
572 The plist is returned. This converts from
|
|
|
573
|
|
|
574 \((a . 1) (b . 2) (c . 3))
|
|
|
575
|
|
|
576 into
|
|
|
577
|
|
|
578 \(a 1 b 2 c 3)
|
|
|
579
|
|
|
580 The original alist is not modified. See also `destructive-alist-to-plist'."
|
|
|
581 (let (plist)
|
|
|
582 (while alist
|
|
|
583 (let ((el (car alist)))
|
|
|
584 (setq plist (cons (cdr el) (cons (car el) plist))))
|
|
|
585 (setq alist (cdr alist)))
|
|
|
586 (nreverse plist)))
|
|
|
587
|
|
|
588 ;; getf, remf in cl*.el.
|
|
|
589
|
|
444
|
590 (defmacro putf (plist property value)
|
|
|
591 "Add property PROPERTY to plist PLIST with value VALUE.
|
|
|
592 Analogous to (setq PLIST (plist-put PLIST PROPERTY VALUE))."
|
|
|
593 `(setq ,plist (plist-put ,plist ,property ,value)))
|
|
428
|
594
|
|
444
|
595 (defmacro laxputf (lax-plist property value)
|
|
|
596 "Add property PROPERTY to lax plist LAX-PLIST with value VALUE.
|
|
|
597 Analogous to (setq LAX-PLIST (lax-plist-put LAX-PLIST PROPERTY VALUE))."
|
|
|
598 `(setq ,lax-plist (lax-plist-put ,lax-plist ,property ,value)))
|
|
428
|
599
|
|
444
|
600 (defmacro laxremf (lax-plist property)
|
|
|
601 "Remove property PROPERTY from lax plist LAX-PLIST.
|
|
|
602 Analogous to (setq LAX-PLIST (lax-plist-remprop LAX-PLIST PROPERTY))."
|
|
|
603 `(setq ,lax-plist (lax-plist-remprop ,lax-plist ,property)))
|
|
428
|
604
|
|
|
605 ;;; Error functions
|
|
|
606
|
|
442
|
607 (defun error (datum &rest args)
|
|
|
608 "Signal a non-continuable error.
|
|
|
609 DATUM should normally be an error symbol, i.e. a symbol defined using
|
|
|
610 `define-error'. ARGS will be made into a list, and DATUM and ARGS passed
|
|
|
611 as the two arguments to `signal', the most basic error handling function.
|
|
|
612
|
|
428
|
613 This error is not continuable: you cannot continue execution after the
|
|
442
|
614 error using the debugger `r' command. See also `cerror'.
|
|
|
615
|
|
|
616 The correct semantics of ARGS varies from error to error, but for most
|
|
|
617 errors that need to be generated in Lisp code, the first argument
|
|
|
618 should be a string describing the *context* of the error (i.e. the
|
|
|
619 exact operation being performed and what went wrong), and the remaining
|
|
|
620 arguments or \"frobs\" (most often, there is one) specify the
|
|
|
621 offending object(s) and/or provide additional details such as the exact
|
|
|
622 error when a file error occurred, e.g.:
|
|
|
623
|
|
|
624 -- the buffer in which an editing error occurred.
|
|
|
625 -- an invalid value that was encountered. (In such cases, the string
|
|
|
626 should describe the purpose or \"semantics\" of the value [e.g. if the
|
|
|
627 value is an argument to a function, the name of the argument; if the value
|
|
|
628 is the value corresponding to a keyword, the name of the keyword; if the
|
|
|
629 value is supposed to be a list length, say this and say what the purpose
|
|
|
630 of the list is; etc.] as well as specifying why the value is invalid, if
|
|
|
631 that's not self-evident.)
|
|
|
632 -- the file in which an error occurred. (In such cases, there should be a
|
|
|
633 second frob, probably a string, specifying the exact error that occurred.
|
|
|
634 This does not occur in the string that precedes the first frob, because
|
|
|
635 that frob describes the exact operation that was happening.
|
|
|
636
|
|
|
637 For historical compatibility, DATUM can also be a string. In this case,
|
|
|
638 DATUM and ARGS are passed together as the arguments to `format', and then
|
|
|
639 an error is signalled using the error symbol `error' and formatted string.
|
|
|
640 Although this usage of `error' is very common, it is deprecated because it
|
|
|
641 totally defeats the purpose of having structured errors. There is now
|
|
|
642 a rich set of defined errors you can use:
|
|
|
643
|
|
563
|
644 quit
|
|
|
645
|
|
442
|
646 error
|
|
|
647 invalid-argument
|
|
563
|
648 syntax-error
|
|
|
649 invalid-read-syntax
|
|
|
650 invalid-regexp
|
|
|
651 structure-formation-error
|
|
|
652 list-formation-error
|
|
|
653 malformed-list
|
|
|
654 malformed-property-list
|
|
|
655 circular-list
|
|
|
656 circular-property-list
|
|
|
657 invalid-function
|
|
|
658 no-catch
|
|
|
659 undefined-keystroke-sequence
|
|
|
660 invalid-constant
|
|
442
|
661 wrong-type-argument
|
|
|
662 args-out-of-range
|
|
|
663 wrong-number-of-arguments
|
|
428
|
664
|
|
442
|
665 invalid-state
|
|
|
666 void-function
|
|
|
667 cyclic-function-indirection
|
|
|
668 void-variable
|
|
|
669 cyclic-variable-indirection
|
|
509
|
670 invalid-byte-code
|
|
563
|
671 stack-overflow
|
|
|
672 out-of-memory
|
|
|
673 invalid-key-binding
|
|
|
674 internal-error
|
|
442
|
675
|
|
|
676 invalid-operation
|
|
|
677 invalid-change
|
|
|
678 setting-constant
|
|
563
|
679 protected-field
|
|
442
|
680 editing-error
|
|
|
681 beginning-of-buffer
|
|
|
682 end-of-buffer
|
|
|
683 buffer-read-only
|
|
|
684 io-error
|
|
509
|
685 file-error
|
|
|
686 file-already-exists
|
|
|
687 file-locked
|
|
|
688 file-supersession
|
|
563
|
689 end-of-file
|
|
|
690 process-error
|
|
|
691 network-error
|
|
509
|
692 tooltalk-error
|
|
563
|
693 gui-error
|
|
|
694 dialog-box-error
|
|
|
695 sound-error
|
|
|
696 conversion-error
|
|
|
697 text-conversion-error
|
|
|
698 image-conversion-error
|
|
|
699 base64-conversion-error
|
|
|
700 selection-conversion-error
|
|
442
|
701 arith-error
|
|
|
702 range-error
|
|
|
703 domain-error
|
|
|
704 singularity-error
|
|
|
705 overflow-error
|
|
|
706 underflow-error
|
|
509
|
707 search-failed
|
|
563
|
708 printing-unreadable-object
|
|
|
709 unimplemented
|
|
509
|
710
|
|
563
|
711 Note the semantic differences between some of the more common errors:
|
|
442
|
712
|
|
563
|
713 -- `invalid-argument' is for all cases where a bad value is encountered.
|
|
|
714 -- `invalid-constant' is for arguments where only a specific set of values
|
|
|
715 is allowed.
|
|
|
716 -- `syntax-error' is when complex structures (parsed strings, lists,
|
|
|
717 and the like) are badly formed. If the problem is just a single bad
|
|
|
718 value inside the structure, you should probably be using something else,
|
|
|
719 e.g. `invalid-constant', `wrong-type-argument', or `invalid-argument'.
|
|
442
|
720 -- `invalid-state' means that some settings have been changed in such a way
|
|
|
721 that their current state is unallowable. More and more, code is being
|
|
|
722 written more carefully, and catches the error when the settings are being
|
|
|
723 changed, rather than afterwards. This leads us to the next error:
|
|
|
724 -- `invalid-change' means that an attempt is being made to change some settings
|
|
|
725 into an invalid state. `invalid-change' is a type of `invalid-operation'.
|
|
|
726 -- `invalid-operation' refers to all cases where code is trying to do something
|
|
563
|
727 that's disallowed, or when an error occurred during an operation. (These
|
|
|
728 two concepts are merged because there's no clear distinction between them.)
|
|
|
729 -- `io-error' refers to errors involving interaction with any external
|
|
|
730 components (files, other programs, the operating system, etc).
|
|
442
|
731
|
|
|
732 See also `cerror', `signal', and `signal-error'."
|
|
|
733 (while t (apply
|
|
|
734 'cerror datum args)))
|
|
|
735
|
|
|
736 (defun cerror (datum &rest args)
|
|
428
|
737 "Like `error' but signals a continuable error."
|
|
442
|
738 (cond ((stringp datum)
|
|
|
739 (signal 'error (list (apply 'format datum args))))
|
|
|
740 ((defined-error-p datum)
|
|
|
741 (signal datum args))
|
|
|
742 (t
|
|
|
743 (error 'invalid-argument "datum not string or error symbol" datum))))
|
|
428
|
744
|
|
|
745 (defmacro check-argument-type (predicate argument)
|
|
|
746 "Check that ARGUMENT satisfies PREDICATE.
|
|
442
|
747 This is a macro, and ARGUMENT is not evaluated. If ARGUMENT is an lvalue,
|
|
|
748 this function signals a continuable `wrong-type-argument' error until the
|
|
|
749 returned value satisfies PREDICATE, and assigns the returned value
|
|
|
750 to ARGUMENT. Otherwise, this function signals a non-continuable
|
|
|
751 `wrong-type-argument' error if the returned value does not satisfy PREDICATE."
|
|
|
752 (if (symbolp argument)
|
|
|
753 `(if (not (,(eval predicate) ,argument))
|
|
|
754 (setq ,argument
|
|
|
755 (wrong-type-argument ,predicate ,argument)))
|
|
|
756 `(if (not (,(eval predicate) ,argument))
|
|
|
757 (signal-error 'wrong-type-argument (list ,predicate ,argument)))))
|
|
428
|
758
|
|
|
759 (defun signal-error (error-symbol data)
|
|
|
760 "Signal a non-continuable error. Args are ERROR-SYMBOL, and associated DATA.
|
|
|
761 An error symbol is a symbol defined using `define-error'.
|
|
|
762 DATA should be a list. Its elements are printed as part of the error message.
|
|
|
763 If the signal is handled, DATA is made available to the handler.
|
|
|
764 See also `signal', and the functions to handle errors: `condition-case'
|
|
|
765 and `call-with-condition-handler'."
|
|
|
766 (while t
|
|
|
767 (signal error-symbol data)))
|
|
|
768
|
|
|
769 (defun define-error (error-sym doc-string &optional inherits-from)
|
|
|
770 "Define a new error, denoted by ERROR-SYM.
|
|
|
771 DOC-STRING is an informative message explaining the error, and will be
|
|
|
772 printed out when an unhandled error occurs.
|
|
|
773 ERROR-SYM is a sub-error of INHERITS-FROM (which defaults to `error').
|
|
|
774
|
|
|
775 \[`define-error' internally works by putting on ERROR-SYM an `error-message'
|
|
|
776 property whose value is DOC-STRING, and an `error-conditions' property
|
|
|
777 that is a list of ERROR-SYM followed by each of its super-errors, up
|
|
|
778 to and including `error'. You will sometimes see code that sets this up
|
|
|
779 directly rather than calling `define-error', but you should *not* do this
|
|
|
780 yourself.]"
|
|
|
781 (check-argument-type 'symbolp error-sym)
|
|
|
782 (check-argument-type 'stringp doc-string)
|
|
|
783 (put error-sym 'error-message doc-string)
|
|
|
784 (or inherits-from (setq inherits-from 'error))
|
|
|
785 (let ((conds (get inherits-from 'error-conditions)))
|
|
|
786 (or conds (signal-error 'error (list "Not an error symbol" error-sym)))
|
|
|
787 (put error-sym 'error-conditions (cons error-sym conds))))
|
|
|
788
|
|
442
|
789 (defun defined-error-p (sym)
|
|
|
790 "Returns non-nil if SYM names a currently-defined error."
|
|
|
791 (and (symbolp sym) (not (null (get sym 'error-conditions)))))
|
|
|
792
|
|
428
|
793 ;;;; Miscellanea.
|
|
|
794
|
|
|
795 ;; This is now in C.
|
|
444
|
796 ;(defun buffer-substring-no-properties (start end)
|
|
|
797 ; "Return the text from START to END, without text properties, as a string."
|
|
|
798 ; (let ((string (buffer-substring start end)))
|
|
428
|
799 ; (set-text-properties 0 (length string) nil string)
|
|
|
800 ; string))
|
|
|
801
|
|
|
802 (defun get-buffer-window-list (&optional buffer minibuf frame)
|
|
|
803 "Return windows currently displaying BUFFER, or nil if none.
|
|
|
804 BUFFER defaults to the current buffer.
|
|
|
805 See `walk-windows' for the meaning of MINIBUF and FRAME."
|
|
|
806 (cond ((null buffer)
|
|
|
807 (setq buffer (current-buffer)))
|
|
|
808 ((not (bufferp buffer))
|
|
|
809 (setq buffer (get-buffer buffer))))
|
|
|
810 (let (windows)
|
|
|
811 (walk-windows (lambda (window)
|
|
|
812 (if (eq (window-buffer window) buffer)
|
|
|
813 (push window windows)))
|
|
|
814 minibuf frame)
|
|
|
815 windows))
|
|
|
816
|
|
|
817 (defun ignore (&rest ignore)
|
|
|
818 "Do nothing and return nil.
|
|
|
819 This function accepts any number of arguments, but ignores them."
|
|
|
820 (interactive)
|
|
|
821 nil)
|
|
|
822
|
|
|
823 (define-function 'eval-in-buffer 'with-current-buffer)
|
|
|
824 (make-obsolete 'eval-in-buffer 'with-current-buffer)
|
|
|
825
|
|
|
826 ;;; The real defn is in abbrev.el but some early callers
|
|
|
827 ;;; (eg lisp-mode-abbrev-table) want this before abbrev.el is loaded...
|
|
|
828
|
|
|
829 (if (not (fboundp 'define-abbrev-table))
|
|
|
830 (progn
|
|
|
831 (setq abbrev-table-name-list '())
|
|
|
832 (fset 'define-abbrev-table (function (lambda (name defs)
|
|
|
833 ;; These are fixed-up when abbrev.el loads.
|
|
|
834 (setq abbrev-table-name-list
|
|
|
835 (cons (cons name defs)
|
|
|
836 abbrev-table-name-list)))))))
|
|
|
837
|
|
|
838 ;;; `functionp' has been moved into C.
|
|
|
839
|
|
|
840 ;;(defun functionp (object)
|
|
|
841 ;; "Non-nil if OBJECT can be called as a function."
|
|
|
842 ;; (or (and (symbolp object) (fboundp object))
|
|
|
843 ;; (subrp object)
|
|
|
844 ;; (compiled-function-p object)
|
|
|
845 ;; (eq (car-safe object) 'lambda)))
|
|
|
846
|
|
|
847
|
|
|
848
|
|
|
849 (defun function-interactive (function)
|
|
|
850 "Return the interactive specification of FUNCTION.
|
|
|
851 FUNCTION can be any funcallable object.
|
|
|
852 The specification will be returned as the list of the symbol `interactive'
|
|
|
853 and the specs.
|
|
|
854 If FUNCTION is not interactive, nil will be returned."
|
|
|
855 (setq function (indirect-function function))
|
|
|
856 (cond ((compiled-function-p function)
|
|
|
857 (compiled-function-interactive function))
|
|
|
858 ((subrp function)
|
|
|
859 (subr-interactive function))
|
|
|
860 ((eq (car-safe function) 'lambda)
|
|
|
861 (let ((spec (if (stringp (nth 2 function))
|
|
|
862 (nth 3 function)
|
|
|
863 (nth 2 function))))
|
|
|
864 (and (eq (car-safe spec) 'interactive)
|
|
|
865 spec)))
|
|
|
866 (t
|
|
|
867 (error "Non-funcallable object: %s" function))))
|
|
|
868
|
|
442
|
869 (defun function-allows-args (function n)
|
|
|
870 "Return whether FUNCTION can be called with N arguments."
|
|
|
871 (and (<= (function-min-args function) n)
|
|
|
872 (or (null (function-max-args function))
|
|
|
873 (<= n (function-max-args function)))))
|
|
|
874
|
|
428
|
875 ;; This function used to be an alias to `buffer-substring', except
|
|
|
876 ;; that FSF Emacs 20.4 added a BUFFER argument in an incompatible way.
|
|
|
877 ;; The new FSF's semantics makes more sense, but we try to support
|
|
|
878 ;; both for backward compatibility.
|
|
|
879 (defun buffer-string (&optional buffer old-end old-buffer)
|
|
|
880 "Return the contents of the current buffer as a string.
|
|
|
881 If narrowing is in effect, this function returns only the visible part
|
|
|
882 of the buffer.
|
|
|
883
|
|
|
884 If BUFFER is specified, the contents of that buffer are returned.
|
|
|
885
|
|
|
886 The arguments OLD-END and OLD-BUFFER are supported for backward
|
|
|
887 compatibility with pre-21.2 XEmacsen times when arguments to this
|
|
|
888 function were (buffer-string &optional START END BUFFER)."
|
|
|
889 (cond
|
|
|
890 ((or (stringp buffer) (bufferp buffer))
|
|
|
891 ;; Most definitely the new way.
|
|
|
892 (buffer-substring nil nil buffer))
|
|
|
893 ((or (stringp old-buffer) (bufferp old-buffer)
|
|
|
894 (natnump buffer) (natnump old-end))
|
|
|
895 ;; Definitely the old way.
|
|
|
896 (buffer-substring buffer old-end old-buffer))
|
|
|
897 (t
|
|
|
898 ;; Probably the old way.
|
|
|
899 (buffer-substring buffer old-end old-buffer))))
|
|
|
900
|
|
|
901 ;; This was not present before. I think Jamie had some objections
|
|
|
902 ;; to this, so I'm leaving this undefined for now. --ben
|
|
|
903
|
|
|
904 ;;; The objection is this: there is more than one way to load the same file.
|
|
|
905 ;;; "foo", "foo.elc", "foo.el", and "/some/path/foo.elc" are all different
|
|
|
906 ;;; ways to load the exact same code. `eval-after-load' is too stupid to
|
|
|
907 ;;; deal with this sort of thing. If this sort of feature is desired, then
|
|
|
908 ;;; it should work off of a hook on `provide'. Features are unique and
|
|
|
909 ;;; the arguments to (load) are not. --Stig
|
|
|
910
|
|
|
911 ;; We provide this for FSFmacs compatibility, at least until we devise
|
|
|
912 ;; something better.
|
|
|
913
|
|
|
914 ;;;; Specifying things to do after certain files are loaded.
|
|
|
915
|
|
|
916 (defun eval-after-load (file form)
|
|
|
917 "Arrange that, if FILE is ever loaded, FORM will be run at that time.
|
|
|
918 This makes or adds to an entry on `after-load-alist'.
|
|
|
919 If FILE is already loaded, evaluate FORM right now.
|
|
|
920 It does nothing if FORM is already on the list for FILE.
|
|
|
921 FILE should be the name of a library, with no directory name."
|
|
|
922 ;; Make sure there is an element for FILE.
|
|
|
923 (or (assoc file after-load-alist)
|
|
|
924 (setq after-load-alist (cons (list file) after-load-alist)))
|
|
|
925 ;; Add FORM to the element if it isn't there.
|
|
|
926 (let ((elt (assoc file after-load-alist)))
|
|
|
927 (or (member form (cdr elt))
|
|
|
928 (progn
|
|
|
929 (nconc elt (list form))
|
|
|
930 ;; If the file has been loaded already, run FORM right away.
|
|
|
931 (and (assoc file load-history)
|
|
|
932 (eval form)))))
|
|
|
933 form)
|
|
|
934 (make-compatible 'eval-after-load "")
|
|
|
935
|
|
|
936 (defun eval-next-after-load (file)
|
|
|
937 "Read the following input sexp, and run it whenever FILE is loaded.
|
|
|
938 This makes or adds to an entry on `after-load-alist'.
|
|
|
939 FILE should be the name of a library, with no directory name."
|
|
|
940 (eval-after-load file (read)))
|
|
|
941 (make-compatible 'eval-next-after-load "")
|
|
|
942
|
|
|
943 ; alternate names (not obsolete)
|
|
|
944 (if (not (fboundp 'mod)) (define-function 'mod '%))
|
|
|
945 (define-function 'move-marker 'set-marker)
|
|
|
946 (define-function 'beep 'ding) ; preserve lingual purity
|
|
|
947 (define-function 'indent-to-column 'indent-to)
|
|
|
948 (define-function 'backward-delete-char 'delete-backward-char)
|
|
|
949 (define-function 'search-forward-regexp (symbol-function 're-search-forward))
|
|
|
950 (define-function 'search-backward-regexp (symbol-function 're-search-backward))
|
|
|
951 (define-function 'remove-directory 'delete-directory)
|
|
|
952 (define-function 'set-match-data 'store-match-data)
|
|
|
953 (define-function 'send-string-to-terminal 'external-debugging-output)
|
|
|
954
|
|
|
955 ;;; subr.el ends here
|
