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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, 1995 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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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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70
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20 ;; along with XEmacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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70
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Code:
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27
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28
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29 ;;;; Lisp language features.
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30
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31 (defmacro lambda (&rest cdr)
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32 "Return a lambda expression.
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33 A call of the form (lambda ARGS DOCSTRING INTERACTIVE BODY) is
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34 self-quoting; the result of evaluating the lambda expression is the
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35 expression itself. The lambda expression may then be treated as a
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36 function, i.e., stored as the function value of a symbol, passed to
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37 funcall or mapcar, etc.
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38
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39 ARGS should take the same form as an argument list for a `defun'.
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40 DOCSTRING is an optional documentation string.
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41 If present, it should describe how to call the function.
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42 But documentation strings are usually not useful in nameless functions.
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43 INTERACTIVE should be a call to the function `interactive', which see.
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44 It may also be omitted.
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45 BODY should be a list of lisp expressions."
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46 ;; Note that this definition should not use backquotes; subr.el should not
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47 ;; depend on backquote.el.
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48 ;; #### - I don't see why. So long as backquote.el doesn't use anything
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49 ;; from subr.el, there's no problem with using backquotes here. --Stig
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4
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50 ;;(list 'function (cons 'lambda cdr)))
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51 `(function (lambda ,@cdr)))
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52
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53 (defmacro defun-when-void (&rest args)
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54 "Define a function, just like `defun', unless it's already defined.
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55 Used for compatibility among different emacs variants."
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56 `(if (fboundp ',(car args))
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57 nil
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58 (defun ,@args)))
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59
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4
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60 (defmacro define-function-when-void (&rest args)
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61 "Define a function, just like `define-function', unless it's already defined.
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62 Used for compatibility among different emacs variants."
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63 `(if (fboundp ,(car args))
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64 nil
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65 (define-function ,@args)))
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66
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67 (define-function 'not 'null)
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70
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68 (define-function-when-void 'numberp 'intergerp) ; different when floats
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69
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70 (defun local-variable-if-set-p (sym buffer)
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71 "Return t if SYM would be local to BUFFER after it is set.
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72 A nil value for BUFFER is *not* the same as (current-buffer), but
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73 can be used to determine whether `make-variable-buffer-local' has been
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74 called on SYM."
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75 (local-variable-p sym buffer t))
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76
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77
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78 ;;;; Hook manipulation functions.
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79
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80 (defun make-local-hook (hook)
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81 "Make the hook HOOK local to the current buffer.
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82 When a hook is local, its local and global values
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83 work in concert: running the hook actually runs all the hook
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84 functions listed in *either* the local value *or* the global value
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85 of the hook variable.
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86
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87 This function works by making `t' a member of the buffer-local value,
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88 which acts as a flag to run the hook functions in the default value as
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89 well. This works for all normal hooks, but does not work for most
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90 non-normal hooks yet. We will be changing the callers of non-normal
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91 hooks so that they can handle localness; this has to be done one by
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92 one.
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93
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94 This function does nothing if HOOK is already local in the current
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95 buffer.
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96
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97 Do not use `make-local-variable' to make a hook variable buffer-local."
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98 (if (local-variable-p hook (current-buffer))
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99 nil
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100 (or (boundp hook) (set hook nil))
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101 (make-local-variable hook)
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102 (set hook (list t))))
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103
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104 (defun add-hook (hook function &optional append local)
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105 "Add to the value of HOOK the function FUNCTION.
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106 FUNCTION is not added if already present.
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107 FUNCTION is added (if necessary) at the beginning of the hook list
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108 unless the optional argument APPEND is non-nil, in which case
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109 FUNCTION is added at the end.
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110
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111 The optional fourth argument, LOCAL, if non-nil, says to modify
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112 the hook's buffer-local value rather than its default value.
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113 This makes no difference if the hook is not buffer-local.
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114 To make a hook variable buffer-local, always use
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115 `make-local-hook', not `make-local-variable'.
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116
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117 HOOK should be a symbol, and FUNCTION may be any valid function. If
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118 HOOK is void, it is first set to nil. If HOOK's value is a single
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119 function, it is changed to a list of functions."
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70
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120 ;(interactive "SAdd to hook-var (symbol): \naAdd which function to %s? ")
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121 (or (boundp hook) (set hook nil))
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122 (or (default-boundp hook) (set-default hook nil))
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123 ;; If the hook value is a single function, turn it into a list.
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124 (let ((old (symbol-value hook)))
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125 (if (or (not (listp old)) (eq (car old) 'lambda))
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126 (set hook (list old))))
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127 (if (or local
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128 ;; Detect the case where make-local-variable was used on a hook
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129 ;; and do what we used to do.
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70
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130 (and (local-variable-if-set-p hook (current-buffer))
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131 (not (memq t (symbol-value hook)))))
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132 ;; Alter the local value only.
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133 (or (if (consp function)
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134 (member function (symbol-value hook))
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135 (memq function (symbol-value hook)))
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136 (set hook
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137 (if append
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138 (append (symbol-value hook) (list function))
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139 (cons function (symbol-value hook)))))
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140 ;; Alter the global value (which is also the only value,
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141 ;; if the hook doesn't have a local value).
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142 (or (if (consp function)
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143 (member function (default-value hook))
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144 (memq function (default-value hook)))
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145 (set-default hook
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146 (if append
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147 (append (default-value hook) (list function))
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148 (cons function (default-value hook)))))))
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149
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150 (defun remove-hook (hook function &optional local)
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151 "Remove from the value of HOOK the function FUNCTION.
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152 HOOK should be a symbol, and FUNCTION may be any valid function. If
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153 FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
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154 list of hooks to run in HOOK, then nothing is done. See `add-hook'.
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155
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156 The optional third argument, LOCAL, if non-nil, says to modify
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157 the hook's buffer-local value rather than its default value.
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158 This makes no difference if the hook is not buffer-local.
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159 To make a hook variable buffer-local, always use
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160 `make-local-hook', not `make-local-variable'."
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161 (if (or (not (boundp hook)) ;unbound symbol, or
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162 (not (default-boundp 'hook))
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163 (null (symbol-value hook)) ;value is nil, or
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164 (null function)) ;function is nil, then
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165 nil ;Do nothing.
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166 (if (or local
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167 ;; Detect the case where make-local-variable was used on a hook
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168 ;; and do what we used to do.
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169 (and (local-variable-p hook (current-buffer))
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170 (not (memq t (symbol-value hook)))))
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171 (let ((hook-value (symbol-value hook)))
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172 (if (consp hook-value)
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173 (if (member function hook-value)
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174 (setq hook-value (delete function (copy-sequence hook-value))))
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175 (if (equal hook-value function)
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176 (setq hook-value nil)))
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177 (set hook hook-value))
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178 (let ((hook-value (default-value hook)))
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179 (if (consp hook-value)
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180 (if (member function hook-value)
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181 (setq hook-value (delete function (copy-sequence hook-value))))
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182 (if (equal hook-value function)
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183 (setq hook-value nil)))
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184 (set-default hook hook-value)))))
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185
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186 (defun add-to-list (list-var element)
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187 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
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188 If you want to use `add-to-list' on a variable that is not defined
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189 until a certain package is loaded, you should put the call to `add-to-list'
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190 into a hook function that will be run only after loading the package.
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191 `eval-after-load' provides one way to do this. In some cases
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192 other hooks, such as major mode hooks, can do the job."
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193 (or (member element (symbol-value list-var))
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194 (set list-var (cons element (symbol-value list-var)))))
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195
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196 ;; called by Fkill_buffer()
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197 (defvar kill-buffer-hook nil
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198 "Function or functions to be called when a buffer is killed.
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199 The value of this variable may be buffer-local.
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200 The buffer about to be killed is current when this hook is run.")
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201
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202 ;; in C in FSFmacs
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203 (defvar kill-emacs-hook nil
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204 "Function or functions to be called when `kill-emacs' is called,
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205 just before emacs is actually killed.")
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206
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207 ;; not obsolete.
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208 (define-function 'rplaca 'setcar)
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209 (define-function 'rplacd 'setcdr)
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210
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211 (defun mapvector (__function __seq)
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212 "Apply FUNCTION to each element of SEQ, making a vector of the results.
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213 The result is a vector of the same length as SEQ.
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214 SEQ may be a list, a vector or a string."
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215 (let* ((len (length __seq))
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216 (vec (make-vector len 'nil))
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217 (i 0))
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218 (while (< i len)
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219 (aset vec i (funcall __function (cond ((listp __seq)
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220 (nth i __seq))
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221 (t (aref __seq i)))))
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222 (setq i (+ i 1)))
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223 vec))
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224
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225 ;;;; String functions.
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226
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227 (defun replace-in-string (str regexp newtext &optional literal)
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228 "Replaces all matches in STR for REGEXP with NEWTEXT string.
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229 Optional LITERAL non-nil means do a literal replacement.
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230 Otherwise treat \\ in NEWTEXT string as special:
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231 \\& means substitute original matched text,
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232 \\N means substitute match for \(...\) number N,
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233 \\\\ means insert one \\."
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234 (if (not (stringp str))
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235 (error "(replace-in-string): First argument must be a string: %s" str))
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236 (if (stringp newtext)
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237 nil
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238 (error "(replace-in-string): 3rd arg must be a string: %s"
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239 newtext))
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240 (let ((rtn-str "")
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241 (start 0)
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242 (special)
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243 match prev-start)
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244 (while (setq match (string-match regexp str start))
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245 (setq prev-start start
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246 start (match-end 0)
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247 rtn-str
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248 (concat
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249 rtn-str
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250 (substring str prev-start match)
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251 (cond (literal newtext)
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252 (t (mapconcat
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253 (function
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254 (lambda (c)
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255 (if special
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256 (progn
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257 (setq special nil)
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258 (cond ((eq c ?\\) "\\")
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259 ((eq c ?&)
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260 (substring str
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261 (match-beginning 0)
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262 (match-end 0)))
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263 ((and (>= c ?0) (<= c ?9))
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264 (if (> c (+ ?0 (length
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265 (match-data))))
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266 ;; Invalid match num
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267 (error "(replace-in-string) Invalid match num: %c" c)
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268 (setq c (- c ?0))
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269 (substring str
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270 (match-beginning c)
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271 (match-end c))))
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272 (t (char-to-string c))))
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273 (if (eq c ?\\) (progn (setq special t) nil)
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274 (char-to-string c)))))
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275 newtext ""))))))
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276 (concat rtn-str (substring str start))))
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277
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278 (defun split-string (string pattern)
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279 "Return a list of substrings of STRING which are separated by PATTERN."
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280 (let (parts (start 0))
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281 (while (string-match pattern string start)
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282 (setq parts (cons (substring string start (match-beginning 0)) parts)
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283 start (match-end 0)))
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284 (nreverse (cons (substring string start) parts))
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285 ))
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286
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287 (defmacro with-output-to-string (&rest forms)
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288 "Collect output to `standard-output' while evaluating FORMS and return
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289 it as a string."
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290 ;; by "William G. Dubuque" <wgd@zurich.ai.mit.edu> w/ mods from Stig
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291 (` (save-excursion
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292 (set-buffer (get-buffer-create " *string-output*"))
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293 (setq buffer-read-only nil)
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294 (buffer-disable-undo (current-buffer))
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295 (erase-buffer)
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296 (let ((standard-output (current-buffer)))
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297 (,@ forms))
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298 (prog1
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299 (buffer-string)
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300 (erase-buffer)))))
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301
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302 (defun insert-face (string face)
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303 "Insert STRING and highlight with FACE. Returns the extent created."
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304 (let ((p (point)) ext)
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305 (insert string)
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306 (setq ext (make-extent p (point)))
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307 (set-extent-face ext face)
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308 ext))
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309
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310 ;; not obsolete.
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311 (define-function 'string= 'string-equal)
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312 (define-function 'string< 'string-lessp)
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313 (define-function 'int-to-string 'number-to-string)
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314 (define-function 'string-to-int 'string-to-number)
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315
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316 ;; alist/plist functions
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317 (defun plist-to-alist (plist)
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318 "Convert property list PLIST into the equivalent association-list form.
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319 The alist is returned. This converts from
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320
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321 \(a 1 b 2 c 3)
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322
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323 into
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324
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325 \((a . 1) (b . 2) (c . 3))
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326
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327 The original plist is not modified. See also `destructive-plist-to-alist'."
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328 (let (alist)
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329 (while plist
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330 (setq alist (cons (cons (car plist) (cadr plist)) alist))
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331 (setq plist (cddr plist)))
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332 (nreverse alist)))
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333
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334 (defun destructive-plist-to-alist (plist)
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335 "Convert property list PLIST into the equivalent association-list form.
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336 The alist is returned. This converts from
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337
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338 \(a 1 b 2 c 3)
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339
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340 into
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341
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342 \((a . 1) (b . 2) (c . 3))
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343
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344 The original plist is destroyed in the process of constructing the alist.
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345 See also `plist-to-alist'."
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346 (let ((head plist)
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347 next)
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348 (while plist
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349 ;; remember the next plist pair.
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350 (setq next (cddr plist))
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351 ;; make the cons holding the property value into the alist element.
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352 (setcdr (cdr plist) (cadr plist))
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353 (setcar (cdr plist) (car plist))
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354 ;; reattach into alist form.
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355 (setcar plist (cdr plist))
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356 (setcdr plist next)
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357 (setq plist next))
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358 head))
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359
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360 (defun alist-to-plist (alist)
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361 "Convert association list ALIST into the equivalent property-list form.
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362 The plist is returned. This converts from
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363
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364 \((a . 1) (b . 2) (c . 3))
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365
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366 into
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367
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368 \(a 1 b 2 c 3)
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369
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370 The original alist is not modified. See also `destructive-alist-to-plist'."
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371 (let (plist)
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372 (while alist
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373 (let ((el (car alist)))
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374 (setq plist (cons (cdr el) (cons (car el) plist))))
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375 (setq alist (cdr alist)))
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376 (nreverse plist)))
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377
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378 ;; getf, remf in cl*.el.
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379
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380 (defmacro putf (plist prop val)
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381 "Add property PROP to plist PLIST with value VAL.
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382 Analogous to (setq PLIST (plist-put PLIST PROP VAL))."
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383 `(setq ,plist (plist-put ,plist ,prop ,val)))
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384
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385 (defmacro laxputf (lax-plist prop val)
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386 "Add property PROP to lax plist LAX-PLIST with value VAL.
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387 Analogous to (setq LAX-PLIST (lax-plist-put LAX-PLIST PROP VAL))."
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388 `(setq ,lax-plist (lax-plist-put ,lax-plist ,prop ,val)))
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389
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390 (defmacro laxremf (lax-plist prop)
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391 "Remove property PROP from lax plist LAX-PLIST.
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392 Analogous to (setq LAX-PLIST (lax-plist-remprop LAX-PLIST PROP))."
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393 `(setq ,lax-plist (lax-plist-remprop ,lax-plist ,prop)))
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394
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395 ;;; Error functions
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396
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397 (defun error (&rest args)
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398 "Signal an error, making error message by passing all args to `format'.
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399 This error is not continuable: you cannot continue execution after the
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400 error using the debugger `r' command. See also `cerror'."
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401 (while t
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402 (apply 'cerror args)))
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403
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404 (defun cerror (&rest args)
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405 "Like `error' but signals a continuable error."
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406 (signal 'error (list (apply 'format args))))
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407
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408 (defmacro check-argument-type (predicate argument)
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409 "Check that ARGUMENT satisfies PREDICATE.
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410 If not, signal a continuable `wrong-type-argument' error until the
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70
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411 returned value satifies PREDICATE, and assign the returned value
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0
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412 to ARGUMENT."
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413 `(if (not (,(eval predicate) ,argument))
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414 (setq ,argument
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415 (wrong-type-argument ,predicate ,argument))))
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416
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417 (defun signal-error (error-symbol data)
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418 "Signal a non-continuable error. Args are ERROR-SYMBOL, and associated DATA.
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419 An error symbol is a symbol defined using `define-error'.
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420 DATA should be a list. Its elements are printed as part of the error message.
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421 If the signal is handled, DATA is made available to the handler.
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422 See also `signal', and the functions to handle errors: `condition-case'
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423 and `call-with-condition-handler'."
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424 (while t
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425 (signal error-symbol data)))
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426
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427 (defun define-error (error-sym doc-string &optional inherits-from)
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428 "Define a new error, denoted by ERROR-SYM.
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429 DOC-STRING is an informative message explaining the error, and will be
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430 printed out when an unhandled error occurs.
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431 ERROR-SYM is a sub-error of INHERITS-FROM (which defaults to `error').
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432
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433 \[`define-error' internally works by putting on ERROR-SYM an `error-message'
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434 property whose value is DOC-STRING, and an `error-conditions' property
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435 that is a list of ERROR-SYM followed by each of its super-errors, up
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436 to and including `error'. You will sometimes see code that sets this up
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437 directly rather than calling `define-error', but you should *not* do this
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438 yourself.]"
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439 (check-argument-type 'symbolp error-sym)
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440 (check-argument-type 'stringp doc-string)
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441 (put error-sym 'error-message doc-string)
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442 (or inherits-from (setq inherits-from 'error))
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443 (let ((conds (get inherits-from 'error-conditions)))
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444 (or conds (signal-error 'error (list "Not an error symbol" error-sym)))
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445 (put error-sym 'error-conditions (cons error-sym conds))))
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446
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447 ;;;; Miscellanea.
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448
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449 (defun buffer-substring-no-properties (beg end)
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450 "Return the text from BEG to END, without text properties, as a string."
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451 (let ((string (buffer-substring beg end)))
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452 (set-text-properties 0 (length string) nil string)
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453 string))
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454
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455 (defun ignore (&rest ignore)
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456 "Do nothing and return nil.
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457 This function accepts any number of arguments, but ignores them."
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458 (interactive)
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459 nil)
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460
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461 (defmacro save-current-buffer (&rest forms)
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462 "Restore the current buffer setting after executing FORMS.
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463 Does not restore the values of point and mark.
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464 See also: `save-excursion'."
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465 ;; by Stig@hackvan.com
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466 (` (let ((_cur_buf_ (current-buffer)))
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467 (unwind-protect
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468 (progn (,@ forms))
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469 (set-buffer _cur_buf_)))))
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470
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471 (defmacro eval-in-buffer (buffer &rest forms)
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472 "Evaluate FORMS in BUFFER.
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473 See also: `save-current-buffer' and `save-excursion'."
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474 ;; by Stig@hackvan.com
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475 (` (save-current-buffer
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476 (set-buffer (, buffer))
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477 (,@ forms))))
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478
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479 ;;; The real defn is in abbrev.el but some early callers
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480 ;;; (eg lisp-mode-abbrev-table) want this before abbrev.el is loaded...
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481
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482 (if (not (fboundp 'define-abbrev-table))
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483 (progn
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484 (setq abbrev-table-name-list '())
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485 (fset 'define-abbrev-table (function (lambda (name defs)
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486 ;; These are fixed-up when abbrev.el loads.
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487 (setq abbrev-table-name-list
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488 (cons (cons name defs)
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489 abbrev-table-name-list)))))))
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490
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491 (defun functionp (obj)
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492 "Returns t if OBJ is a function, nil otherwise."
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493 (cond
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494 ((symbolp obj) (fboundp obj))
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495 ((subrp obj))
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496 ((compiled-function-p obj))
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497 ((consp obj)
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498 (if (eq (car obj) 'lambda) (listp (car (cdr obj)))))
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499 (t nil)))
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500
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501 ;; This was not present before. I think Jamie had some objections
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502 ;; to this, so I'm leaving this undefined for now. --ben
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503
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|
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504 ;;; The objection is this: there is more than one way to load the same file.
|
|
70
|
505 ;;; "foo", "foo.elc", "foo.el", and "/some/path/foo.elc" are all differrent
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|
0
|
506 ;;; ways to load the exact same code. `eval-after-load' is too stupid to
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507 ;;; deal with this sort of thing. If this sort of feature is desired, then
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508 ;;; it should work off of a hook on `provide'. Features are unique and
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509 ;;; the arguments to (load) are not. --Stig
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510
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|
511 ;;;; Specifying things to do after certain files are loaded.
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512
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|
70
|
513 ;(defun eval-after-load (file form)
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|
514 ; "Arrange that, if FILE is ever loaded, FORM will be run at that time.
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515 ;This makes or adds to an entry on `after-load-alist'.
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516 ;If FILE is already loaded, evaluate FORM right now.
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517 ;It does nothing if FORM is already on the list for FILE.
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518 ;FILE should be the name of a library, with no directory name."
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519 ; ;; Make sure there is an element for FILE.
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520 ; (or (assoc file after-load-alist)
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521 ; (setq after-load-alist (cons (list file) after-load-alist)))
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|
|
522 ; ;; Add FORM to the element if it isn't there.
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|
|
523 ; (let ((elt (assoc file after-load-alist)))
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|
|
524 ; (or (member form (cdr elt))
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|
|
525 ; (progn
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|
|
526 ; (nconc elt (list form))
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|
|
527 ; ;; If the file has been loaded already, run FORM right away.
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|
|
528 ; (and (assoc file load-history)
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|
|
529 ; (eval form)))))
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|
|
530 ; form)
|
|
|
531 ;
|
|
|
532 ;(defun eval-next-after-load (file)
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|
|
533 ; "Read the following input sexp, and run it whenever FILE is loaded.
|
|
|
534 ;This makes or adds to an entry on `after-load-alist'.
|
|
|
535 ;FILE should be the name of a library, with no directory name."
|
|
|
536 ; (eval-after-load file (read)))
|
|
0
|
537
|
|
|
538 ; alternate names (not obsolete)
|
|
|
539 (if (not (fboundp 'mod)) (define-function 'mod '%))
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|
|
540 (define-function 'move-marker 'set-marker)
|
|
2
|
541 (define-function 'beep 'ding) ; preserve lingual purity
|
|
0
|
542 (define-function 'indent-to-column 'indent-to)
|
|
|
543 (define-function 'backward-delete-char 'delete-backward-char)
|
|
|
544 (define-function 'search-forward-regexp (symbol-function 're-search-forward))
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|
|
545 (define-function 'search-backward-regexp (symbol-function 're-search-backward))
|
|
|
546 (define-function 'remove-directory 'delete-directory)
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|
|
547 (define-function 'set-match-data 'store-match-data)
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|
|
548 (define-function 'send-string-to-terminal 'external-debugging-output)
|
|
|
549 (define-function 'buffer-string 'buffer-substring)
|
