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1 ;;; disp-table.el --- functions for dealing with char tables.
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2
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3 ;; Copyright (C) 1987, 1994 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Sun Microsystems.
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5
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6 ;; Author: Howard Gayle
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7 ;; Maintainer: FSF
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8 ;; Keywords: i18n
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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25
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26 ;;; Synched up with: Not synched with FSF.
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27
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28 ;;; #### Need lots of work. make-display-table depends on a value
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29 ;;; that is a define in the C code. Maybe we should just move the
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30 ;;; function into C.
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31
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32 ;;; #### display-tables-as-vectors is really evil and a big pain in
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33 ;;; the ass.
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34
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35 ;;; Rewritten for XEmacs July 1995, Ben Wing.
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36
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37 ;;; Code:
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38
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39 (defun describe-display-table (dt)
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40 "Describe the display table DT in a help buffer."
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41 (with-displaying-help-buffer
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42 (princ "\nCharacter display glyph sequences:\n")
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43 (save-excursion
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44 (set-buffer standard-output)
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45 (let ((vector (make-vector 256 nil))
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46 (i 0))
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47 (while (< i 256)
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48 (aset vector i (aref dt i))
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49 (setq i (1+ i)))
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50 (describe-vector vector)))))
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51
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52 ;;;###autoload
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53 (defun describe-current-display-table (&optional domain)
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54 "Describe the display table in use in the selected window and buffer."
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55 (interactive)
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56 (or domain (setq domain (selected-window)))
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57 (let ((disptab (specifier-instance current-display-table domain)))
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58 (if disptab
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59 (describe-display-table disptab)
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60 (message "No display table"))))
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61
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62 ;;;###autoload
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63 (defun make-display-table ()
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64 "Return a new, empty display table."
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65 (make-vector 256 nil))
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66
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67 ;; #### we need a generic frob-specifier function.
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68 ;; #### this also needs to be redone like frob-face-property.
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69
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70 ;; Let me say one more time how much dynamic scoping sucks.
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71
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72 (defun frob-display-table (fdt-function fdt-locale)
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73 (or fdt-locale (setq fdt-locale 'global))
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74 (or (specifier-spec-list current-display-table fdt-locale)
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75 (add-spec-to-specifier current-display-table (make-display-table)
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76 fdt-locale))
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77 (add-spec-list-to-specifier
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78 current-display-table
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79 (list (cons fdt-locale
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80 (mapcar
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81 #'(lambda (fdt-x)
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82 (funcall fdt-function (cdr fdt-x))
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83 fdt-x)
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84 (cdar (specifier-spec-list current-display-table
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85 fdt-locale)))))))
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86
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87 (defun standard-display-8bit-1 (dt l h)
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88 (while (<= l h)
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89 (aset dt l (char-to-string l))
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90 (setq l (1+ l))))
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91
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92 ;;;###autoload
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93 (defun standard-display-8bit (l h &optional locale)
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94 "Display characters in the range L to H literally."
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95 (frob-display-table
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96 #'(lambda (x)
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97 (standard-display-8bit-1 x l h))
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98 locale))
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99
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100 (defun standard-display-default-1 (dt l h)
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101 (while (<= l h)
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102 (aset dt l nil)
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103 (setq l (1+ l))))
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104
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105 ;;;###autoload
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106 (defun standard-display-default (l h &optional locale)
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107 "Display characters in the range L to H using the default notation."
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108 (frob-display-table
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109 #'(lambda (x)
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110 (standard-display-default-1 x l h))
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111 locale))
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112
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113 ;;;###autoload
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114 (defun standard-display-ascii (c s &optional locale)
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115 "Display character C using printable string S."
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116 (frob-display-table
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117 #'(lambda (x)
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118 (aset x c s))
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119 locale))
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120
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121
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122 ;;; #### should frob in a 'tty locale.
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123
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124 ;;;###autoload
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125 (defun standard-display-g1 (c sc &optional locale)
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126 "Display character C as character SC in the g1 character set.
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127 This function assumes that your terminal uses the SO/SI characters;
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128 it is meaningless for an X frame."
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129 (frob-display-table
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130 #'(lambda (x)
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131 (aset x c (concat "\016" (char-to-string sc) "\017")))
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132 locale))
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133
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134
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135 ;;; #### should frob in a 'tty locale.
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136
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137 ;;;###autoload
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138 (defun standard-display-graphic (c gc &optional locale)
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139 "Display character C as character GC in graphics character set.
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140 This function assumes VT100-compatible escapes; it is meaningless for an
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141 X frame."
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142 (frob-display-table
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143 #'(lambda (x)
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144 (aset x c (concat "\e(0" (char-to-string gc) "\e(B")))
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145 locale))
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146
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147 ;;; #### should frob in a 'tty locale.
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148 ;;; #### the FSF equivalent of this makes this character be displayed
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149 ;;; in the 'underline face. There's no current way to do this with
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150 ;;; XEmacs display tables.
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151
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152 ;;;###autoload
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153 (defun standard-display-underline (c uc &optional locale)
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154 "Display character C as character UC plus underlining."
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155 (frob-display-table
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156 #'(lambda (x)
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157 (aset x c (concat "\e[4m" (char-to-string uc) "\e[m")))
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158 locale))
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159
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160 ;;;###autoload
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161 (defun standard-display-european (arg &optional locale)
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162 "Toggle display of European characters encoded with ISO 8859.
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163 When enabled, characters in the range of 160 to 255 display not
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164 as octal escapes, but as accented characters.
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165 With prefix argument, enable European character display iff arg is positive."
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166 (interactive "P")
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167 (frob-display-table
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168 #'(lambda (x)
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169 (if (or (<= (prefix-numeric-value arg) 0)
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170 (and (null arg)
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171 (equal (aref x 160) (char-to-string 160))))
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172 (standard-display-default-1 x 160 255)
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173 (standard-display-8bit-1 x 160 255)))
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174 locale))
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175
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176 (provide 'disp-table)
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177
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178 ;;; disp-table.el ends here
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