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1 ;; mule-misc.el --- Miscellaneous Mule functions.
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2
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3 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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4 ;; Licensed to the Free Software Foundation.
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5 ;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
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6 ;; Copyright (C) 1995 Amdahl Corporation.
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7 ;; Copyright (C) 1995 Sun Microsystems.
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;;
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27 ;;; protect specified local variables from kill-all-local-variables
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28 ;;;
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29
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30 (defvar self-insert-after-hook nil
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31 "Hook to run when extended self insertion command exits. Should take
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32 two arguments START and END corresponding to character position.")
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33
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34 (make-variable-buffer-local 'self-insert-after-hook)
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35
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36 (defun toggle-display-direction ()
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37 (interactive)
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38 (setq display-direction (not display-direction))
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39 (if (interactive-p) (redraw-display)))
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40
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41 ;;;
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42 ;;; Utility functions for Mule
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43 ;;;
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44
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45 ;(defun string-to-char-list (str)
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46 ; (let ((len (length str))
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47 ; (idx 0)
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48 ; c l)
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49 ; (while (< idx len)
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50 ; (setq c (sref str idx))
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51 ; (setq idx (+ idx (charset-dimension (char-charset c))))
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52 ; (setq l (cons c l)))
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53 ; (nreverse l)))
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54
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55 (defun string-to-char-list (str)
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56 (mapcar 'identity str))
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57
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58 (defun string-width (string)
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59 "Return number of columns STRING occupies when displayed.
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60 Uses the charset-columns attribute of the characters in STRING,
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61 which may not accurately represent the actual display width when
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62 using a window system."
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63 (let ((col 0)
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64 (len (length string))
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65 (i 0))
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66 (while (< i len)
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67 (setq col (+ col (charset-columns (char-charset (aref string i)))))
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68 (setq i (1+ i)))
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69 col))
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70
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71 (defalias 'string-columns 'string-width)
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72 (make-obsolete 'string-columns 'string-width)
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73
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74 (defun delete-text-in-column (from to)
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75 "Delete the text between column FROM and TO (exclusive) of the current line.
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76 Nil of FORM or TO means the current column.
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77
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78 If there's a character across the borders, the character is replaced
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79 with the same width of spaces before deleting."
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80 (save-excursion
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81 (let (p1 p2)
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82 (if from
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83 (progn
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84 (setq p1 (move-to-column from))
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85 (if (> p1 from)
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86 (progn
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87 (delete-char -1)
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88 (insert-char ? (- p1 (current-column)))
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89 (forward-char (- from p1))))))
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90 (setq p1 (point))
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91 (if to
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92 (progn
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93 (setq p2 (move-to-column to))
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94 (if (> p2 to)
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95 (progn
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96 (delete-char -1)
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97 (insert-char ? (- p2 (current-column)))
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98 (forward-char (- to p2))))))
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99 (setq p2 (point))
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100 (delete-region p1 p2))))
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101
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102 ;; #### Someone translate this!!
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103
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104 (defun mc-normal-form-string (str)
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105 "文字列 STR の漢字標準形文字列を返す．"
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106 (let ((i 0))
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107 (while (setq i (string-match "\n" str i))
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108 (if (and (<= 1 i) (< i (1- (length str)))
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109 (< (aref str (1- i)) 128)
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110 (< (aref str (1+ i)) 128))
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111 (aset str i ? ))
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112 (setq i (1+ i)))
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113 (if (string-match "\n" str 0)
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114 (let ((c 0) (i 0) new)
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115 (while (setq i (string-match "\n" str i))
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116 (setq i (1+ i))
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117 (setq c (1+ c)))
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118 (setq new (make-string (- (length str) c) 0))
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119 (setq i 0 c 0)
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120 (while (< i (length str))
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121 (cond((not (= (aref str i) ?\n ))
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122 (aset new c (aref str i))
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123 (setq c (1+ c))))
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124
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125 (setq i (1+ i))
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126 )
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127 new)
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128 str)))
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129
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130
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131 (defun string-memq (str list)
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132 "Returns non-nil if STR is an element of LIST. Comparison done with string=.
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133 The value is actually the tail of LIST whose car is STR.
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134 If each element of LIST is not a string, it is converted to string
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135 before comparison."
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136 (let (find elm)
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137 (while (and (not find) list)
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138 (setq elm (car list))
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139 (if (numberp elm) (setq elm (char-to-string elm)))
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140 (if (string= str elm)
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141 (setq find list)
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142 (setq list (cdr list))))
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143 find))
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144
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145 (defun cancel-undo-boundary ()
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146 "Cancel undo boundary."
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147 (if (and (consp buffer-undo-list)
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148 ;; if car is nil.
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149 (null (car buffer-undo-list)) )
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150 (setq buffer-undo-list (cdr buffer-undo-list)) ))
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151
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152
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153 ;;; Common API emulation functions for GNU Emacs-merged Mule.
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154 ;;; As suggested by MORIOKA Tomohiko
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155
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156 ;; Following definition were imported from Emacs/mule-delta.
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157
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158 ;; Function `truncate-string-to-width' was moved to mule-util.el.
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159
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160 ;; end of imported definition
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161
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162
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163 (defalias 'sref 'aref)
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164 (defalias 'map-char-concat 'mapcar)
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165 (defun char-bytes (character)
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166 "Return number of length a CHARACTER occupies in a string or buffer.
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167 It returns only 1 in XEmacs. It is for compatibility with MULE 2.3."
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168 1)
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169 (defalias 'char-length 'char-bytes)
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170
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171 (defun char-width (character)
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172 "Return number of columns a CHARACTER occupies when displayed."
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173 (charset-columns (char-charset character)))
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174
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175 (defalias 'char-columns 'char-width)
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176 (make-obsolete 'char-columns 'char-width)
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177
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178 (defalias 'charset-description 'charset-doc-string)
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179
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180 (defalias 'find-charset-string 'charsets-in-string)
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181 (defalias 'find-charset-region 'charsets-in-region)
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182
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183 (defun find-non-ascii-charset-string (string)
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184 "Return a list of charsets in the STRING except ascii.
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185 It might be available for compatibility with Mule 2.3,
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186 because its `find-charset-string' ignores ASCII charset."
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187 (delq 'ascii (charsets-in-string string)))
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188
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189 (defun find-non-ascii-charset-region (start end)
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190 "Return a list of charsets except ascii in the region between START and END.
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191 It might be available for compatibility with Mule 2.3,
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192 because its `find-charset-string' ignores ASCII charset."
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193 (delq 'ascii (charsets-in-region start end)))
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194
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195 (defun split-char (char)
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196 "Return list of charset and one or two position-codes of CHAR."
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197 (let ((charset (char-charset char)))
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198 (if (eq charset 'ascii)
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199 (list charset (char-int char))
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200 (let ((i 0)
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201 (len (charset-dimension charset))
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202 (code (if (integerp char)
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203 char
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204 (char-int char)))
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205 dest)
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206 (while (< i len)
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207 (setq dest (cons (logand code 127) dest)
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208 code (lsh code -7)
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209 i (1+ i)))
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210 (cons charset dest)
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211 ))))
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212
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213
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214 ;;; Commands
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215
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216 (defun set-buffer-process-coding-system (decoding encoding)
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217 "Set coding systems for the process associated with the current buffer.
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218 DECODING is the coding system to be used to decode input from the process,
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219 ENCODING is the coding system to be used to encode output to the process.
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220
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221 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems]."
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222 (interactive
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223 "zCoding-system for process input: \nzCoding-system for process output: ")
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224 (let ((proc (get-buffer-process (current-buffer))))
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225 (if (null proc)
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226 (error "no process")
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227 (check-coding-system decoding)
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228 (check-coding-system encoding)
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229 (set-process-coding-system proc decoding encoding)))
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230 (force-mode-line-update))
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231
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232
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233 ;;; Language environments
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234
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235 ;; (defvar current-language-environment nil)
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236
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237 ;; (defvar language-environment-list nil)
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238
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239 ;; (defun current-language-environment ()
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240 ;; "Return the current language environment as a symbol.
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241 ;; Returns nil if `set-language-environment' has not been called."
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242 ;; current-language-environment)
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243
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244 ;; (defun language-environment-list ()
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245 ;; "Return a list of all currently defined language environments."
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246 ;; language-environment-list)
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247
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248 ;; (defun language-environment-p (sym)
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249 ;; "True if SYM names a defined language environment."
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250 ;; (memq sym (language-environment-list)))
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251
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252 ;; (defun set-language-environment (env)
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253 ;; "Set the current language environment to ENV."
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254 ;; (interactive
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255 ;; (list (intern (completing-read "Language environment: "
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256 ;; obarray 'language-environment-p
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257 ;; 'require-match))))
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258 ;; (when (not (string= (charset-registry 'ascii) "iso8859-1"))
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259 ;; (set-charset-registry 'ascii "iso8859-1"))
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260 ;; (let ((func (get env 'set-lang-environ)))
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261 ;; (if (not (null func))
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262 ;; (funcall func)))
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263 ;; (setq current-language-environment env)
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264 ;; (if (featurep 'egg)
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265 ;; (egg-lang-switch-callback))
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266 ;; ;; (if (featurep 'quail)
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267 ;; ;; (quail-lang-switch-callback))
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268 ;; )
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269
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270 ;; (defun define-language-environment (env-sym doc-string enable-function)
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271 ;; "Define a new language environment, named by ENV-SYM.
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272 ;; DOC-STRING should be a string describing the environment.
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273 ;; ENABLE-FUNCTION should be a function of no arguments that will be called
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274 ;; when the language environment is made current."
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275 ;; (put env-sym 'lang-environ-doc-string doc-string)
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276 ;; (put env-sym 'set-lang-environ enable-function)
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277 ;; (setq language-environment-list (cons env-sym language-environment-list)))
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278
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279 (defun define-egg-environment (env-sym doc-string enable-function)
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280 "Define a new language environment for egg, named by ENV-SYM.
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281 DOC-STRING should be a string describing the environment.
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282 ENABLE-FUNCTION should be a function of no arguments that will be called
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283 when the language environment is made current."
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284 (put env-sym 'egg-environ-doc-string doc-string)
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285 (put env-sym 'set-egg-environ enable-function))
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286
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287 ;; (defun define-quail-environment (env-sym doc-string enable-function)
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288 ;; "Define a new language environment for quail, named by ENV-SYM.
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289 ;; DOC-STRING should be a string describing the environment.
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290 ;; ENABLE-FUNCTION should be a function of no arguments that will be called
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291 ;; when the language environment is made current."
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292 ;; (put env-sym 'quail-environ-doc-string doc-string)
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293 ;; (put env-sym 'set-quail-environ enable-function))
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294
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295 ;;; mule-misc.el ends here
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