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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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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: FSF 19.30.
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24
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25 ;;; Code:
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26
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27
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28 ;;;; Lisp language features.
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29
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30 (defmacro lambda (&rest cdr)
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31 "Return a lambda expression.
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32 A call of the form (lambda ARGS DOCSTRING INTERACTIVE BODY) is
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33 self-quoting; the result of evaluating the lambda expression is the
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34 expression itself. The lambda expression may then be treated as a
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35 function, i.e., stored as the function value of a symbol, passed to
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36 funcall or mapcar, etc.
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37
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38 ARGS should take the same form as an argument list for a `defun'.
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39 DOCSTRING is an optional documentation string.
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40 If present, it should describe how to call the function.
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41 But documentation strings are usually not useful in nameless functions.
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42 INTERACTIVE should be a call to the function `interactive', which see.
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43 It may also be omitted.
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44 BODY should be a list of lisp expressions."
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45 ;; Note that this definition should not use backquotes; subr.el should not
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46 ;; depend on backquote.el.
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47 ;; #### - I don't see why. So long as backquote.el doesn't use anything
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48 ;; from subr.el, there's no problem with using backquotes here. --Stig
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49 (list 'function (cons 'lambda cdr)))
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50
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51 (define-function 'not 'null)
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52 (if (not (fboundp 'numberp))
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53 (define-function 'numberp 'integerp)) ; different when floats
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54
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55 (defun local-variable-if-set-p (sym buffer)
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56 "Return t if SYM would be local to BUFFER after it is set.
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57 A nil value for BUFFER is *not* the same as (current-buffer), but
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58 can be used to determine whether `make-variable-buffer-local' has been
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59 called on SYM."
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60 (local-variable-p sym buffer t))
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61
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62
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63 ;;;; Hook manipulation functions.
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64
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65 (defun make-local-hook (hook)
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66 "Make the hook HOOK local to the current buffer.
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67 When a hook is local, its local and global values
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68 work in concert: running the hook actually runs all the hook
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69 functions listed in *either* the local value *or* the global value
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70 of the hook variable.
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71
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72 This function works by making `t' a member of the buffer-local value,
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73 which acts as a flag to run the hook functions in the default value as
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74 well. This works for all normal hooks, but does not work for most
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75 non-normal hooks yet. We will be changing the callers of non-normal
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76 hooks so that they can handle localness; this has to be done one by
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77 one.
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78
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79 This function does nothing if HOOK is already local in the current
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80 buffer.
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81
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82 Do not use `make-local-variable' to make a hook variable buffer-local."
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83 (if (local-variable-p hook (current-buffer))
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84 nil
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85 (or (boundp hook) (set hook nil))
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86 (make-local-variable hook)
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87 (set hook (list t))))
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88
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89 (defun add-hook (hook function &optional append local)
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90 "Add to the value of HOOK the function FUNCTION.
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91 FUNCTION is not added if already present.
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92 FUNCTION is added (if necessary) at the beginning of the hook list
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93 unless the optional argument APPEND is non-nil, in which case
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94 FUNCTION is added at the end.
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95
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96 The optional fourth argument, LOCAL, if non-nil, says to modify
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97 the hook's buffer-local value rather than its default value.
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98 This makes no difference if the hook is not buffer-local.
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99 To make a hook variable buffer-local, always use
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100 `make-local-hook', not `make-local-variable'.
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101
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102 HOOK should be a symbol, and FUNCTION may be any valid function. If
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103 HOOK is void, it is first set to nil. If HOOK's value is a single
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104 function, it is changed to a list of functions."
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105 ;(interactive "SAdd to hook-var (symbol): \naAdd which function to %s? ")
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106 (or (boundp hook) (set hook nil))
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107 (or (default-boundp hook) (set-default hook nil))
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108 ;; If the hook value is a single function, turn it into a list.
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109 (let ((old (symbol-value hook)))
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110 (if (or (not (listp old)) (eq (car old) 'lambda))
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111 (set hook (list old))))
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112 (if (or local
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113 ;; Detect the case where make-local-variable was used on a hook
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114 ;; and do what we used to do.
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115 (and (local-variable-if-set-p hook (current-buffer))
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116 (not (memq t (symbol-value hook)))))
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117 ;; Alter the local value only.
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118 (or (if (consp function)
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119 (member function (symbol-value hook))
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120 (memq function (symbol-value hook)))
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121 (set hook
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122 (if append
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123 (append (symbol-value hook) (list function))
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124 (cons function (symbol-value hook)))))
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125 ;; Alter the global value (which is also the only value,
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126 ;; if the hook doesn't have a local value).
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127 (or (if (consp function)
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128 (member function (default-value hook))
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129 (memq function (default-value hook)))
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130 (set-default hook
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131 (if append
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132 (append (default-value hook) (list function))
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133 (cons function (default-value hook)))))))
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134
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135 (defun remove-hook (hook function &optional local)
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136 "Remove from the value of HOOK the function FUNCTION.
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137 HOOK should be a symbol, and FUNCTION may be any valid function. If
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138 FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
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139 list of hooks to run in HOOK, then nothing is done. See `add-hook'.
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140
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141 The optional third argument, LOCAL, if non-nil, says to modify
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142 the hook's buffer-local value rather than its default value.
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143 This makes no difference if the hook is not buffer-local.
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144 To make a hook variable buffer-local, always use
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145 `make-local-hook', not `make-local-variable'."
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146 (if (or (not (boundp hook)) ;unbound symbol, or
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147 (not (default-boundp 'hook))
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148 (null (symbol-value hook)) ;value is nil, or
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149 (null function)) ;function is nil, then
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150 nil ;Do nothing.
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151 (if (or local
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152 ;; Detect the case where make-local-variable was used on a hook
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153 ;; and do what we used to do.
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154 (and (local-variable-p hook (current-buffer))
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155 (not (memq t (symbol-value hook)))))
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156 (let ((hook-value (symbol-value hook)))
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157 (if (consp hook-value)
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158 (if (member function hook-value)
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159 (setq hook-value (delete function (copy-sequence hook-value))))
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160 (if (equal hook-value function)
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161 (setq hook-value nil)))
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162 (set hook hook-value))
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163 (let ((hook-value (default-value hook)))
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164 (if (consp hook-value)
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165 (if (member function hook-value)
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166 (setq hook-value (delete function (copy-sequence hook-value))))
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167 (if (equal hook-value function)
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168 (setq hook-value nil)))
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169 (set-default hook hook-value)))))
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170
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171 (defun add-to-list (list-var element)
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172 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
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173 If you want to use `add-to-list' on a variable that is not defined
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174 until a certain package is loaded, you should put the call to `add-to-list'
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175 into a hook function that will be run only after loading the package.
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176 `eval-after-load' provides one way to do this. In some cases
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177 other hooks, such as major mode hooks, can do the job."
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178 (or (member element (symbol-value list-var))
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179 (set list-var (cons element (symbol-value list-var)))))
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180
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181 ;; called by Fkill_buffer()
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182 (defvar kill-buffer-hook nil
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183 "Function or functions to be called when a buffer is killed.
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184 The value of this variable may be buffer-local.
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185 The buffer about to be killed is current when this hook is run.")
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186
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187 ;; in C in FSFmacs
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188 (defvar kill-emacs-hook nil
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189 "Function or functions to be called when `kill-emacs' is called,
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190 just before emacs is actually killed.")
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191
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192 ;; not obsolete.
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193 (define-function 'rplaca 'setcar)
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194 (define-function 'rplacd 'setcdr)
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195
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196 (defun mapvector (__function __seq)
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197 "Apply FUNCTION to each element of SEQ, making a vector of the results.
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198 The result is a vector of the same length as SEQ.
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199 SEQ may be a list, a vector or a string."
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200 (let* ((len (length __seq))
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201 (vec (make-vector len 'nil))
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202 (i 0))
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203 (while (< i len)
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204 (aset vec i (funcall __function (cond ((listp __seq)
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205 (nth i __seq))
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206 (t (aref __seq i)))))
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207 (setq i (+ i 1)))
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208 vec))
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209
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210 ;;;; String functions.
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211
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212 (defun replace-in-string (str regexp newtext &optional literal)
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213 "Replaces all matches in STR for REGEXP with NEWTEXT string.
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214 Optional LITERAL non-nil means do a literal replacement.
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215 Otherwise treat \\ in NEWTEXT string as special:
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216 \\& means substitute original matched text,
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217 \\N means substitute match for \(...\) number N,
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218 \\\\ means insert one \\."
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219 (if (not (stringp str))
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220 (error "(replace-in-string): First argument must be a string: %s" str))
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221 (if (stringp newtext)
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222 nil
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223 (error "(replace-in-string): 3rd arg must be a string: %s"
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224 newtext))
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225 (let ((rtn-str "")
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226 (start 0)
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227 (special)
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228 match prev-start)
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229 (while (setq match (string-match regexp str start))
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230 (setq prev-start start
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231 start (match-end 0)
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232 rtn-str
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233 (concat
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234 rtn-str
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235 (substring str prev-start match)
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236 (cond (literal newtext)
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237 (t (mapconcat
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238 (function
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239 (lambda (c)
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240 (if special
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241 (progn
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242 (setq special nil)
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243 (cond ((eq c ?\\) "\\")
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244 ((eq c ?&)
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245 (substring str
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246 (match-beginning 0)
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247 (match-end 0)))
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248 ((and (>= c ?0) (<= c ?9))
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249 (if (> c (+ ?0 (length
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250 (match-data))))
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251 ;; Invalid match num
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252 (error "(replace-in-string) Invalid match num: %c" c)
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253 (setq c (- c ?0))
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254 (substring str
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255 (match-beginning c)
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256 (match-end c))))
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257 (t (char-to-string c))))
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258 (if (eq c ?\\) (progn (setq special t) nil)
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259 (char-to-string c)))))
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260 newtext ""))))))
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261 (concat rtn-str (substring str start))))
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262
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263 (defun split-string (string pattern)
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264 "Return a list of substrings of STRING which are separated by PATTERN."
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265 (let (parts (start 0))
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266 (while (string-match pattern string start)
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267 (setq parts (cons (substring string start (match-beginning 0)) parts)
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268 start (match-end 0)))
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269 (nreverse (cons (substring string start) parts))
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270 ))
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271
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272 (defmacro with-output-to-string (&rest forms)
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273 "Collect output to `standard-output' while evaluating FORMS and return
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274 it as a string."
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275 ;; by "William G. Dubuque" <wgd@zurich.ai.mit.edu> w/ mods from Stig
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276 (` (save-excursion
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277 (set-buffer (get-buffer-create " *string-output*"))
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278 (setq buffer-read-only nil)
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279 (buffer-disable-undo (current-buffer))
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280 (erase-buffer)
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281 (let ((standard-output (current-buffer)))
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282 (,@ forms))
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283 (prog1
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284 (buffer-string)
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285 (erase-buffer)))))
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286
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287 (defun insert-face (string face)
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288 "Insert STRING and highlight with FACE. Returns the extent created."
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289 (let ((p (point)) ext)
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290 (insert string)
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291 (setq ext (make-extent p (point)))
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292 (set-extent-face ext face)
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293 ext))
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294
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295 ;; not obsolete.
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296 (define-function 'string= 'string-equal)
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297 (define-function 'string< 'string-lessp)
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298 (define-function 'int-to-string 'number-to-string)
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299 (define-function 'string-to-int 'string-to-number)
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300
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301 ;; alist/plist functions
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302 (defun plist-to-alist (plist)
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303 "Convert property list PLIST into the equivalent association-list form.
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304 The alist is returned. This converts from
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305
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306 \(a 1 b 2 c 3)
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307
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308 into
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309
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310 \((a . 1) (b . 2) (c . 3))
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311
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312 The original plist is not modified. See also `destructive-plist-to-alist'."
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313 (let (alist)
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314 (while plist
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315 (setq alist (cons (cons (car plist) (cadr plist)) alist))
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316 (setq plist (cddr plist)))
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317 (nreverse alist)))
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318
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319 (defun destructive-plist-to-alist (plist)
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320 "Convert property list PLIST into the equivalent association-list form.
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321 The alist is returned. This converts from
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322
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323 \(a 1 b 2 c 3)
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324
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325 into
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326
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327 \((a . 1) (b . 2) (c . 3))
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328
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329 The original plist is destroyed in the process of constructing the alist.
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330 See also `plist-to-alist'."
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331 (let ((head plist)
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332 next)
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333 (while plist
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334 ;; remember the next plist pair.
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335 (setq next (cddr plist))
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336 ;; make the cons holding the property value into the alist element.
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337 (setcdr (cdr plist) (cadr plist))
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338 (setcar (cdr plist) (car plist))
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339 ;; reattach into alist form.
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340 (setcar plist (cdr plist))
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341 (setcdr plist next)
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342 (setq plist next))
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343 head))
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344
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345 (defun alist-to-plist (alist)
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346 "Convert association list ALIST into the equivalent property-list form.
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347 The plist is returned. This converts from
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348
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349 \((a . 1) (b . 2) (c . 3))
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350
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351 into
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352
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353 \(a 1 b 2 c 3)
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354
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355 The original alist is not modified. See also `destructive-alist-to-plist'."
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356 (let (plist)
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357 (while alist
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358 (let ((el (car alist)))
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359 (setq plist (cons (cdr el) (cons (car el) plist))))
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360 (setq alist (cdr alist)))
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361 (nreverse plist)))
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362
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363 ;; getf, remf in cl*.el.
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364
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365 (defmacro putf (plist prop val)
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366 "Add property PROP to plist PLIST with value VAL.
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367 Analogous to (setq PLIST (plist-put PLIST PROP VAL))."
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368 `(setq ,plist (plist-put ,plist ,prop ,val)))
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369
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370 (defmacro laxputf (lax-plist prop val)
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371 "Add property PROP to lax plist LAX-PLIST with value VAL.
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372 Analogous to (setq LAX-PLIST (lax-plist-put LAX-PLIST PROP VAL))."
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373 `(setq ,lax-plist (lax-plist-put ,lax-plist ,prop ,val)))
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374
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375 (defmacro laxremf (lax-plist prop)
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376 "Remove property PROP from lax plist LAX-PLIST.
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377 Analogous to (setq LAX-PLIST (lax-plist-remprop LAX-PLIST PROP))."
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378 `(setq ,lax-plist (lax-plist-remprop ,lax-plist ,prop)))
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379
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380 ;;; Error functions
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381
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382 (defun error (&rest args)
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383 "Signal an error, making error message by passing all args to `format'.
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384 This error is not continuable: you cannot continue execution after the
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385 error using the debugger `r' command. See also `cerror'."
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386 (while t
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387 (apply 'cerror args)))
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388
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389 (defun cerror (&rest args)
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390 "Like `error' but signals a continuable error."
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391 (signal 'error (list (apply 'format args))))
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392
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393 (defmacro check-argument-type (predicate argument)
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394 "Check that ARGUMENT satisfies PREDICATE.
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395 If not, signal a continuable `wrong-type-argument' error until the
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396 returned value satifies PREDICATE, and assign the returned value
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397 to ARGUMENT."
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398 `(if (not (,(eval predicate) ,argument))
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399 (setq ,argument
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400 (wrong-type-argument ,predicate ,argument))))
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401
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402 (defun signal-error (error-symbol data)
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403 "Signal a non-continuable error. Args are ERROR-SYMBOL, and associated DATA.
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404 An error symbol is a symbol defined using `define-error'.
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405 DATA should be a list. Its elements are printed as part of the error message.
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406 If the signal is handled, DATA is made available to the handler.
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407 See also `signal', and the functions to handle errors: `condition-case'
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408 and `call-with-condition-handler'."
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409 (while t
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410 (signal error-symbol data)))
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411
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412 (defun define-error (error-sym doc-string &optional inherits-from)
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413 "Define a new error, denoted by ERROR-SYM.
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414 DOC-STRING is an informative message explaining the error, and will be
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415 printed out when an unhandled error occurs.
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416 ERROR-SYM is a sub-error of INHERITS-FROM (which defaults to `error').
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417
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418 \[`define-error' internally works by putting on ERROR-SYM an `error-message'
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419 property whose value is DOC-STRING, and an `error-conditions' property
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420 that is a list of ERROR-SYM followed by each of its super-errors, up
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421 to and including `error'. You will sometimes see code that sets this up
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422 directly rather than calling `define-error', but you should *not* do this
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423 yourself.]"
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424 (check-argument-type 'symbolp error-sym)
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425 (check-argument-type 'stringp doc-string)
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426 (put error-sym 'error-message doc-string)
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427 (or inherits-from (setq inherits-from 'error))
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428 (let ((conds (get inherits-from 'error-conditions)))
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429 (or conds (signal-error 'error (list "Not an error symbol" error-sym)))
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430 (put error-sym 'error-conditions (cons error-sym conds))))
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431
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432 ;;;; Miscellanea.
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433
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434 (defun buffer-substring-no-properties (beg end)
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435 "Return the text from BEG to END, without text properties, as a string."
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436 (let ((string (buffer-substring beg end)))
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437 (set-text-properties 0 (length string) nil string)
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438 string))
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439
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440 (defun ignore (&rest ignore)
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441 "Do nothing and return nil.
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442 This function accepts any number of arguments, but ignores them."
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443 (interactive)
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444 nil)
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445
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446 (defmacro save-current-buffer (&rest forms)
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447 "Restore the current buffer setting after executing FORMS.
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448 Does not restore the values of point and mark.
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449 See also: `save-excursion'."
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450 ;; by Stig@hackvan.com
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451 (` (let ((_cur_buf_ (current-buffer)))
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452 (unwind-protect
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453 (progn (,@ forms))
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454 (set-buffer _cur_buf_)))))
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455
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456 (defmacro eval-in-buffer (buffer &rest forms)
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457 "Evaluate FORMS in BUFFER.
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458 See also: `save-current-buffer' and `save-excursion'."
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459 ;; by Stig@hackvan.com
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460 (` (save-current-buffer
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461 (set-buffer (, buffer))
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462 (,@ forms))))
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463
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464 ;;; The real defn is in abbrev.el but some early callers
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465 ;;; (eg lisp-mode-abbrev-table) want this before abbrev.el is loaded...
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466
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467 (if (not (fboundp 'define-abbrev-table))
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468 (progn
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469 (setq abbrev-table-name-list '())
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470 (fset 'define-abbrev-table (function (lambda (name defs)
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471 ;; These are fixed-up when abbrev.el loads.
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472 (setq abbrev-table-name-list
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473 (cons (cons name defs)
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474 abbrev-table-name-list)))))))
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475
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476 (defun functionp (obj)
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477 "Returns t if OBJ is a function, nil otherwise."
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478 (cond
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479 ((symbolp obj) (fboundp obj))
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480 ((subrp obj))
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481 ((compiled-function-p obj))
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482 ((consp obj)
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483 (if (eq (car obj) 'lambda) (listp (car (cdr obj)))))
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484 (t nil)))
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485
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486 ;; This was not present before. I think Jamie had some objections
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487 ;; to this, so I'm leaving this undefined for now. --ben
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488
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489 ;;; The objection is this: there is more than one way to load the same file.
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490 ;;; "foo", "foo.elc", "foo.el", and "/some/path/foo.elc" are all differrent
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491 ;;; ways to load the exact same code. `eval-after-load' is too stupid to
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492 ;;; deal with this sort of thing. If this sort of feature is desired, then
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493 ;;; it should work off of a hook on `provide'. Features are unique and
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494 ;;; the arguments to (load) are not. --Stig
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495
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496 ;;;; Specifying things to do after certain files are loaded.
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497
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498 ;(defun eval-after-load (file form)
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499 ; "Arrange that, if FILE is ever loaded, FORM will be run at that time.
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500 ;This makes or adds to an entry on `after-load-alist'.
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501 ;If FILE is already loaded, evaluate FORM right now.
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502 ;It does nothing if FORM is already on the list for FILE.
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503 ;FILE should be the name of a library, with no directory name."
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504 ; ;; Make sure there is an element for FILE.
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505 ; (or (assoc file after-load-alist)
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506 ; (setq after-load-alist (cons (list file) after-load-alist)))
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507 ; ;; Add FORM to the element if it isn't there.
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508 ; (let ((elt (assoc file after-load-alist)))
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509 ; (or (member form (cdr elt))
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510 ; (progn
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511 ; (nconc elt (list form))
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512 ; ;; If the file has been loaded already, run FORM right away.
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513 ; (and (assoc file load-history)
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514 ; (eval form)))))
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515 ; form)
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516 ;
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517 ;(defun eval-next-after-load (file)
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518 ; "Read the following input sexp, and run it whenever FILE is loaded.
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519 ;This makes or adds to an entry on `after-load-alist'.
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520 ;FILE should be the name of a library, with no directory name."
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521 ; (eval-after-load file (read)))
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522
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523 ; alternate names (not obsolete)
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524 (if (not (fboundp 'mod)) (define-function 'mod '%))
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525 (define-function 'move-marker 'set-marker)
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526 (define-function 'beep 'ding) ;preserve lingual purtity
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527 (define-function 'indent-to-column 'indent-to)
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528 (define-function 'backward-delete-char 'delete-backward-char)
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529 (define-function 'search-forward-regexp (symbol-function 're-search-forward))
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530 (define-function 'search-backward-regexp (symbol-function 're-search-backward))
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531 (define-function 'remove-directory 'delete-directory)
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532 (define-function 'set-match-data 'store-match-data)
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533 (define-function 'send-string-to-terminal 'external-debugging-output)
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534 (define-function 'buffer-string 'buffer-substring)
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