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1 ;;; mule-misc.el --- Miscellaneous Mule functions.
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2
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3 ;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Amdahl Corporation.
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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
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;;
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25 ;;; protect specified local variables from kill-all-local-variables
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26 ;;;
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27
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28 (defvar self-insert-after-hook nil
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29 "Hook to run when extended self insertion command exits. Should take
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30 two arguments START and END corresponding to character position.")
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31
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32 (make-variable-buffer-local 'self-insert-after-hook)
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33
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34 (defun toggle-display-direction ()
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35 (interactive)
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36 (setq display-direction (not display-direction))
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37 (if (interactive-p) (redraw-display)))
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38
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39 ;;;
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40 ;;; Utility functions for Mule
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41 ;;;
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42
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43 ;(defun string-to-char-list (str)
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44 ; (let ((len (length str))
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45 ; (idx 0)
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46 ; c l)
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47 ; (while (< idx len)
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48 ; (setq c (sref str idx))
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49 ; (setq idx (+ idx (charset-dimension (char-charset c))))
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50 ; (setq l (cons c l)))
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51 ; (nreverse l)))
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52
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53 (defun string-to-char-list (str)
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54 (mapcar 'identity str))
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55
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82
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56 (defun string-width (string)
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70
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57 "Return number of columns STRING occupies when displayed.
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58 Uses the charset-columns attribute of the characters in STRING,
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59 which may not accurately represent the actual display width when
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60 using a window system."
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61 (let ((col 0)
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62 (len (length string))
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63 (i 0))
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64 (while (< i len)
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65 (setq col (+ col (charset-columns (char-charset (aref string i)))))
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66 (setq i (1+ i)))
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67 col))
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68
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82
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69 (defalias 'string-columns 'string-width)
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70 (make-obsolete 'string-columns 'string-width)
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70
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71
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72 (defun delete-text-in-column (from to)
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73 "Delete the text between column FROM and TO (exclusive) of the current line.
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74 Nil of FORM or TO means the current column.
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108
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75
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76 If there's a character across the borders, the character is replaced
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77 with the same width of spaces before deleting."
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70
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78 (save-excursion
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79 (let (p1 p2)
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80 (if from
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81 (progn
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82 (setq p1 (move-to-column from))
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83 (if (> p1 from)
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84 (progn
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85 (delete-char -1)
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86 (insert-char ? (- p1 (current-column)))
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87 (forward-char (- from p1))))))
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88 (setq p1 (point))
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89 (if to
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90 (progn
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91 (setq p2 (move-to-column to))
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92 (if (> p2 to)
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93 (progn
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94 (delete-char -1)
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95 (insert-char ? (- p2 (current-column)))
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96 (forward-char (- to p2))))))
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97 (setq p2 (point))
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98 (delete-region p1 p2))))
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99
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100 ;; #### Someone translate this!!
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101
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102 (defun mc-normal-form-string (str)
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103 "文字列 STR の漢字標準形文字列を返す．"
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104 (let ((i 0))
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105 (while (setq i (string-match "\n" str i))
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106 (if (and (<= 1 i) (< i (1- (length str)))
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107 (< (aref str (1- i)) 128)
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108 (< (aref str (1+ i)) 128))
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109 (aset str i ? ))
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110 (setq i (1+ i)))
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111 (if (string-match "\n" str 0)
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112 (let ((c 0) (i 0) new)
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113 (while (setq i (string-match "\n" str i))
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114 (setq i (1+ i))
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115 (setq c (1+ c)))
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116 (setq new (make-string (- (length str) c) 0))
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117 (setq i 0 c 0)
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118 (while (< i (length str))
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119 (cond((not (= (aref str i) ?\n ))
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120 (aset new c (aref str i))
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121 (setq c (1+ c))))
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122
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123 (setq i (1+ i))
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124 )
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125 new)
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126 str)))
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127
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128
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129 (defun string-memq (str list)
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130 "Returns non-nil if STR is an element of LIST. Comparison done with string=.
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131 The value is actually the tail of LIST whose car is STR.
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132 If each element of LIST is not a string, it is converted to string
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133 before comparison."
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134 (let (find elm)
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135 (while (and (not find) list)
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136 (setq elm (car list))
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137 (if (numberp elm) (setq elm (char-to-string elm)))
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138 (if (string= str elm)
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139 (setq find list)
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140 (setq list (cdr list))))
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141 find))
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142
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143 (defun cancel-undo-boundary ()
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144 "Cancel undo boundary."
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145 (if (and (consp buffer-undo-list)
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146 ;; if car is nil.
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147 (null (car buffer-undo-list)) )
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148 (setq buffer-undo-list (cdr buffer-undo-list)) ))
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149
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150
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151 ;;; Common API emulation functions for GNU Emacs-merged Mule.
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152 ;;; As suggested by MORIOKA Tomohiko
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82
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153
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154 ;; Following definition were imported from Emacs/mule-delta.
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155
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156 (defun truncate-string-to-width (str width &optional start-column padding)
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157 "Truncate string STR to fit in WIDTH columns.
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158 Optional 1st arg START-COLUMN if non-nil specifies the starting column.
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159 Optional 2nd arg PADDING if non-nil, space characters are padded at
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160 the head and tail of the resulting string to fit in WIDTH if necessary.
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161 If PADDING is nil, the resulting string may be narrower than WIDTH."
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162 (or start-column
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163 (setq start-column 0))
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164 (let ((len (length str))
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165 (idx 0)
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166 (column 0)
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167 (head-padding "") (tail-padding "")
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168 ch last-column last-idx from-idx)
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169 (condition-case nil
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170 (while (< column start-column)
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171 (setq ch (sref str idx)
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172 column (+ column (char-width ch))
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173 idx (+ idx (char-bytes ch))))
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174 (args-out-of-range (setq idx len)))
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175 (if (< column start-column)
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176 (if padding (make-string width ?\ ) "")
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177 (if (and padding (> column start-column))
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178 (setq head-padding (make-string (- column start-column) ?\ )))
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179 (setq from-idx idx)
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180 (condition-case nil
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181 (while (< column width)
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182 (setq last-column column
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183 last-idx idx
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184 ch (sref str idx)
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185 column (+ column (char-width ch))
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186 idx (+ idx (char-bytes ch))))
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187 (args-out-of-range (setq idx len)))
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188 (if (> column width)
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189 (setq column last-column idx last-idx))
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190 (if (and padding (< column width))
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191 (setq tail-padding (make-string (- width column) ?\ )))
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192 (setq str (substring str from-idx idx))
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193 (if padding
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194 (concat head-padding str tail-padding)
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195 str))))
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196
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197 ;;; For backward compatiblity ...
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198 ;;;###autoload
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199 (defalias 'truncate-string 'truncate-string-to-width)
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200 (make-obsolete 'truncate-string 'truncate-string-to-width)
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201
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202 ;; end of imported definition
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203
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204
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205 (defalias 'sref 'aref)
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206 (defalias 'map-char-concat 'mapcar)
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82
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207 (defun char-bytes (character)
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208 "Return number of length a CHARACTER occupies in a string or buffer.
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209 It returns only 1 in XEmacs. It is for compatibility with MULE 2.3."
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210 1)
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211 (defalias 'char-length 'char-bytes)
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212
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82
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213 (defun char-width (character)
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214 "Return number of columns a CHARACTER occupies when displayed."
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215 (charset-columns (char-charset character)))
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216
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217 (defalias 'char-columns 'char-width)
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218 (make-obsolete 'char-columns 'char-width)
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219
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220 (defalias 'charset-description 'charset-doc-string)
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221
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222 (defalias 'find-charset-string 'charsets-in-string)
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223 (defalias 'find-charset-region 'charsets-in-region)
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224
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225 (defun find-non-ascii-charset-string (string)
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226 "Return a list of charsets in the STRING except ascii.
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227 It might be available for compatibility with Mule 2.3,
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228 because its `find-charset-string' ignores ASCII charset."
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229 (delq 'ascii (charsets-in-string string)))
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230
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231 (defun find-non-ascii-charset-region (start end)
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82
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232 "Return a list of charsets except ascii in the region between START and END.
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233 It might be available for compatibility with Mule 2.3,
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234 because its `find-charset-string' ignores ASCII charset."
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235 (delq 'ascii (charsets-in-region start end)))
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236
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237
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238 ;;; Language environments
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239
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240 (defvar current-language-environment nil)
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241
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242 (defvar language-environment-list nil)
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243
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244 (defun current-language-environment ()
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245 "Return the current language environment as a symbol.
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246 Returns nil if `set-language-environment' has not been called."
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247 current-language-environment)
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248
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249 (defun language-environment-list ()
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250 "Return a list of all currently defined language environments."
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251 language-environment-list)
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252
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253 (defun language-environment-p (sym)
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254 "True if SYM names a defined language environment."
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255 (memq sym (language-environment-list)))
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256
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257 (defun set-language-environment (env)
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258 "Set the current language environment to ENV."
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259 (interactive
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260 (list (intern (completing-read "Language environment: "
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261 obarray 'language-environment-p
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262 'require-match))))
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263 (when (not (string= (charset-registry 'ascii) "ISO8859-1"))
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264 (set-charset-registry 'ascii "ISO8859-1"))
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265 (let ((func (get env 'set-lang-environ)))
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266 (if (not (null func))
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267 (funcall func)))
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268 (setq current-language-environment env))
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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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