annotate lisp/iso/iso-acc.el @ 4:b82b59fe008d r19-15b3

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date Mon, 13 Aug 2007 08:46:56 +0200
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1 ;;; iso-acc.el --- minor mode providing electric accent keys
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2
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3 ;; Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
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4
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5 ;; Author: Johan Vromans <jv@mh.nl>
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6 ;; Version: 1.7 (modified)
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7 ;; Maintainer: FSF
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8 ;; Keywords: i18n
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9 ;; Adapted for XEmacs 19.14 by Alexandre Oliva <oliva@dcc.unicamp.br>
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10 ;; Last update: Oct 10, 1996
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11
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12 ;; This file is part of GNU Emacs.
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13
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14 ;; GNU Emacs is free software; you can redistribute it and/or modify
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15 ;; it under the terms of the GNU General Public License as published by
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16 ;; the Free Software Foundation; either version 2, or (at your option)
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17 ;; any later version.
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18
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19 ;; GNU Emacs is distributed in the hope that it will be useful,
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20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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22 ;; GNU General Public License for more details.
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23
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24 ;; You should have received a copy of the GNU General Public License
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25 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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26 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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27 ;; Boston, MA 02111-1307, USA.
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28
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29 ;;; Commentary:
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30
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31 ;; Function `iso-accents-mode' activates a minor mode in which
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32 ;; typewriter "dead keys" are emulated. The purpose of this emulation
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33 ;; is to provide a simple means for inserting accented characters
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34 ;; according to the ISO-8859-1 character set.
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35 ;;
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36 ;; In `iso-accents-mode', pseudo accent characters are used to
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37 ;; introduce accented keys. The pseudo-accent characters are:
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38 ;;
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39 ;; ' (minute) -> grave accent
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40 ;; ` (backtick) -> acute accent
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41 ;; " (second) -> diaeresis
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42 ;; ^ (caret) -> circumflex
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43 ;; ~ (tilde) -> tilde over the character
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44 ;; / (slash) -> slash through the character.
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45 ;; , (cedilla) -> cedilla under the character (except on default mode).
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46 ;; Also: /A is A-with-ring and /E is AE ligature.
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47 ;;
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48 ;; The action taken depends on the key that follows the pseudo accent.
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49 ;; In general:
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50 ;;
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51 ;; pseudo-accent + appropriate letter -> accented letter
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52 ;; pseudo-accent + space -> pseudo-accent (except for comma)
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53 ;; pseudo-accent + pseudo-accent -> accent (if available)
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54 ;; pseudo-accent + other -> pseudo-accent + other
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55 ;;
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56 ;; If the pseudo-accent is followed by anything else than a
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57 ;; self-insert-command, the dead-key code is terminated, the
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58 ;; pseudo-accent inserted 'as is' and the bell is rung to signal this.
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59 ;;
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60 ;; Function `iso-accents-mode' can be used to enable the iso accents
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61 ;; minor mode, or disable it.
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62
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63 ;; If you want only some of these characters to serve as accents,
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64 ;; add a language to `iso-languages' which specifies the accent characters
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65 ;; that you want, then select the language with `iso-accents-customize'.
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66
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67 ;;; Code:
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68
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69 (provide 'iso-acc)
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70
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71 ;; needed for compatibility with XEmacs 19.14
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72 (if (fboundp 'read-event) ()
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73 (defun read-event () (event-key (next-command-event))))
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74
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75 ;; needed to work on GNU Emacs (had to use this function on XEmacs)
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76 (if (fboundp 'character-to-event) ()
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77 (defun character-to-event (ch &optional event console meta) ch))
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78
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79 ;; needed for compatibility with XEmacs 19.14 and GNU Emacs 19.30
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80 (if (fboundp 'this-single-command-keys) ()
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81 (if (string-match "Lucid" (version))
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82 (defun this-single-command-keys ()
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83 (setq this-command (not (this-command-keys)))
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84 (this-command-keys))
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85 (defun this-single-command-keys () (this-command-keys))))
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86
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87 (if (string-match "Lucid" (version))
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88 (progn
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89 (global-set-key [quoted-insert-for-iso-acc] 'quoted-insert)
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90 (defun iso-generate-char (char)
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91 "inserts the octal representation of char into unread-command-events,\nand then returns the pseudo-key quoted-insert-for-iso-acc (which should be mapped to quoted-insert).\n\nCan be used in keymaps to generate characters from 128 to 255."
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92 (setq unread-command-events
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93 (append
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94 (mapcar 'character-to-event (list
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95 (+ 48 (/ char 64))
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96 (+ 48 (% (/ char 8) 8))
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97 (+ 48 (% char 8))))
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98 unread-command-events))
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99 [quoted-insert-for-iso-acc])
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100 )
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101 (defun iso-generate-char (char)
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102 "Just returns a vector with the given character.\n\nNot necessary in the GNU Emacs implementation"
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103 (vector char))
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104 )
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105
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106
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107 (defvar iso-languages
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108 '(("portuguese"
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109 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
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110 (?C . ?\307) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
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111 (?u . ?\372) (?c . ?\347) (?\ . ?') (space . ?'))
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112 (?` (?A . ?\300) (?a . ?\340) (?\ . ?`) (space . ?`))
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113 (?^ (?A . ?\302) (?E . ?\312) (?O . ?\324) (?a . ?\342) (?e . ?\352)
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114 (?o . ?\364) (?\ . ?^) (space . ?^))
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115 (?\" (?U . ?\334) (?u . ?\374) (?\ . ?\") (space . ?\"))
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116 (?\~ (?A . ?\303) (?O . ?\325) (?a . ?\343) (?o . ?\365) (?\ . ?\~) (space . ?\~))
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117 (?, (?c . ?\347) (?C . ?\307)))
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118
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119 ("irish"
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120 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
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121 (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
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122 (?\ . ?') (space . ?')))
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123
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124 ("french"
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125 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
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126 (?C . ?\307) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
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127 (?u . ?\372) (?c . ?\347) (?\ . ?') (space . ?'))
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128 (?` (?A . ?\300) (?E . ?\310) (?a . ?\340) (?e . ?\350) (?\ . ?`) (space . ?`))
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129 (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
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130 (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
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131 (?\ . ?^) (space . ?^))
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132 (?\" (?U . ?\334) (?u . ?\374) (?\ . ?\") (space . ?\"))
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133 (?\~ (?A . ?\303) (?O . ?\325) (?a . ?\343) (?o . ?\365) (?\ . ?\~) (space . ?\~))
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134 (?, (?c . ?\347) (?C . ?\307)))
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135
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136 ("latin-2"
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137 (?' (?A . ?\301) (?C . ?\306) (?D . ?\320) (?E . ?\311) (?I . ?\315)
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138 (?L . ?\305) (?N . ?\321) (?O . ?\323) (?R . ?\300) (?S . ?\246)
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139 (?U . ?\332) (?Y . ?\335) (?Z . ?\254) (?a . ?\341) (?c . ?\346)
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140 (?d . ?\360) (?e . ?\351) (?i . ?\355) (?l . ?\345) (?n . ?\361)
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141 (?o . ?\363) (?r . ?\340) (?s . ?\266) (?u . ?\372) (?y . ?\375)
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142 (?z . ?\274) (?' . ?\264) (?\ . ?') (space . ?'))
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143 (?` (?A . ?\241) (?C . ?\307) (?E . ?\312) (?L . ?\243) (?S . ?\252)
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144 (?T . ?\336) (?Z . ?\257) (?a . ?\261) (?l . ?\263) (?c . ?\347)
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145 (?e . ?\352) (?s . ?\272) (?t . ?\376) (?z . ?\277) (?` . ?\252)
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146 (?. . ?\377) (?\ . ?`) (space . ?`))
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147 (?^ (?A . ?\302) (?O . ?\324) (?a . ?\342) (?o . ?\364)
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148 (?^ . ?^) ; no special code?
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149 (?\ . ?^) (space . ?^))
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150 (?\" (?A . ?\304) (?E . ?\313) (?O . ?\326) (?U . ?\334) (?a . ?\344)
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151 (?e . ?\353) (?o . ?\366) (?s . ?\337) (?u . ?\374) (?\" . ?\250)
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152 (?\ . ?\") (space . ?\"))
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153 (?\~ (?A . ?\303) (?C . ?\310) (?D . ?\317) (?L . ?\245) (?N . ?\322)
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154 (?O . ?\325) (?R . ?\330) (?S . ?\251) (?T . ?\253) (?U . ?\333)
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155 (?Z . ?\256) (?a . ?\323) (?c . ?\350) (?d . ?\357) (?l . ?\265)
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156 (?n . ?\362) (?o . ?\365) (?r . ?\370) (?s . ?\271) (?t . ?\273)
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157 (?u . ?\373) (?z . ?\276)
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158 (?v . ?\242) ; v accent
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159 (?\~ . ?\242) ; v accent
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160 (?\. . ?\270) ; cedilla accent
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161 (?\ . ?\~) (space . ?\~)))
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162
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163 ("latin-1"
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164 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
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165 (?Y . ?\335) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
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166 (?u . ?\372) (?y . ?\375) (?' . ?\264) (?\ . ?') (space . ?'))
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167 (?` (?A . ?\300) (?E . ?\310) (?I . ?\314) (?O . ?\322) (?U . ?\331)
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168 (?a . ?\340) (?e . ?\350) (?i . ?\354) (?o . ?\362) (?u . ?\371)
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169 (?` . ?`) (?\ . ?`) (space . ?`))
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170 (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
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171 (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
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172 (?^ . ?^) (?\ . ?^) (space . ?^))
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173 (?\" (?A . ?\304) (?E . ?\313) (?I . ?\317) (?O . ?\326) (?U . ?\334)
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174 (?a . ?\344) (?e . ?\353) (?i . ?\357) (?o . ?\366) (?s . ?\337)
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175 (?u . ?\374) (?y . ?\377) (?\" . ?\250) (?\ . ?\") (space . ?\"))
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176 (?\~ (?A . ?\303) (?C . ?\307) (?D . ?\320) (?N . ?\321) (?O . ?\325)
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177 (?T . ?\336) (?a . ?\343) (?c . ?\347) (?d . ?\360) (?n . ?\361)
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178 (?o . ?\365) (?t . ?\376) (?> . ?\273) (?< . ?\253) (?\~ . ?\270)
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179 (?! . ?\241) (?? . ?\277)
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180 (?\ . ?\~) (space . ?\~))
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181 (?\/ (?A . ?\305) (?E . ?\306) (?O . ?\330) (?a . ?\345) (?e . ?\346)
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182 (?o . ?\370) (?\/ . ?\260) (?\ . ?\/) (space . ?\/))))
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183 "List of language-specific customizations for the ISO Accents mode.
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184
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185 Each element of the list is of the form
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186
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187 (LANGUAGE
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188 (PSEUDO-ACCENT MAPPINGS)
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189 (PSEUDO-ACCENT MAPPINGS)
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190 ...)
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191
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192 LANGUAGE is a string naming the language.
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193 PSEUDO-ACCENT is a char specifying an accent key.
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194 MAPPINGS are cons cells of the form (CHAR . ISO-CHAR).
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195
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196 The net effect is that the key sequence PSEUDO-ACCENT CHAR is mapped
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197 to ISO-CHAR on input.")
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198
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199 (defvar iso-language nil
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200 "Language for which ISO Accents mode is currently customized.
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201 Change it with the `iso-accents-customize' function.")
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202
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203 (defvar iso-accents-list nil
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204 "Association list for ISO accent combinations, for the chosen language.")
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205
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206 (defvar iso-accents-mode nil
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207 "*Non-nil enables ISO Accents mode.
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208 Setting this variable makes it local to the current buffer.
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209 See the function `iso-accents-mode'.")
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210 (make-variable-buffer-local 'iso-accents-mode)
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211
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212 (defvar iso-accents-enable '(?' ?` ?^ ?\" ?~ ?/ ?,)
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213 "*List of accent keys that become prefixes in ISO Accents mode.
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214 The default is (?' ?` ?^ ?\" ?~ ?/ ?,), which contains all the supported
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215 accent keys. If you set this variable to a list in which some of those
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216 characters are missing, the missing ones do not act as accents.
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217
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218 Note that if you specify a language with `iso-accents-customize',
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219 that can also turn off certain prefixes (whichever ones are not needed in
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220 the language you choose).")
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221
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222 (defun iso-accents-accent-key (prompt)
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223 "Modify the following character by adding an accent to it."
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224 ;; Pick up the accent character.
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225 (if (and iso-accents-mode
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226 (memq last-input-char iso-accents-enable))
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227 (iso-accents-compose prompt)
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228 (char-to-string last-input-char)))
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229
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230 (defun iso-accents-compose (prompt)
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231 (let* ((first-char last-input-char)
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232 (list (assq first-char iso-accents-list))
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233 ;; Wait for the second key and look up the combination.
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234 (second-char (if (or prompt
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235 (not (eq (key-binding "a")
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236 'self-insert-command))
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237 ;; Not at start of a key sequence.
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238 (> (length (this-single-command-keys)) 1)
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239 ;; Called from anything but the command loop.
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240 this-command)
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241 (progn
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242 (message "%s%c"
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243 (or prompt "Compose with ")
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244 first-char)
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245 (read-event))
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246 (insert first-char)
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247 (prog1 (read-event)
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248 (delete-region (1- (point)) (point)))))
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249 (entry (cdr (assq second-char list))))
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250 (if entry
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251 ;; Found it: return the mapped char
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252 (iso-generate-char entry)
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253 ;; Otherwise, advance and schedule the second key for execution.
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254 (setq unread-command-events (list (character-to-event second-char)))
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255 (vector first-char))))
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256
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257 ;; It is a matter of taste if you want the minor mode indicated
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258 ;; in the mode line...
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259 ;; If so, uncomment the next four lines.
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260 ;; (or (assq 'iso-accents-mode minor-mode-alist)
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261 ;; (setq minor-mode-alist
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262 ;; (append minor-mode-alist
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263 ;; '((iso-accents-mode " ISO-Acc")))))
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264
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265 ;;;###autoload
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266 (defun iso-accents-mode (&optional arg)
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267 "Toggle ISO Accents mode, in which accents modify the following letter.
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268 This permits easy insertion of accented characters according to ISO-8859-1.
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269 When Iso-accents mode is enabled, accent character keys
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270 \(`, ', \", ^, / and ~) do not self-insert; instead, they modify the following
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271 letter key so that it inserts an ISO accented letter.
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272
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273 You can customize ISO Accents mode to a particular language
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274 with the command `iso-accents-customize'.
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275
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276 Special combinations: ~c gives a c with cedilla,
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277 ~d gives an Icelandic eth (d with dash).
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278 ~t gives an Icelandic thorn.
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279 \"s gives German sharp s.
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280 /a gives a with ring.
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281 /e gives an a-e ligature.
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282 ~< and ~> give guillemots.
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283 ~! gives an inverted exclamation mark.
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284 ~? gives an inverted question mark.
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285
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286 With an argument, a positive argument enables ISO Accents mode,
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287 and a negative argument disables it."
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288
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289 (interactive "P")
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290
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291 (if (if arg
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292 ;; Negative arg means switch it off.
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293 (<= (prefix-numeric-value arg) 0)
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294 ;; No arg means toggle.
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295 iso-accents-mode)
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296 (setq iso-accents-mode nil)
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297
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298 ;; Enable electric accents.
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299 (setq iso-accents-mode t)))
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300
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301 (defun iso-accents-customize (language)
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302 "Customize the ISO accents machinery for a particular language.
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303 It selects the customization based on the specifications in the
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304 `iso-languages' variable."
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305 (interactive (list (completing-read "Language: " iso-languages nil t)))
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306 (let ((table (assoc language iso-languages)) tail)
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307 (if (not table)
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308 (error "Unknown language '%s'" language)
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309 (setq iso-language language
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310 iso-accents-list (cdr table))
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311 (if key-translation-map
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312 (substitute-key-definition
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313 'iso-accents-accent-key nil key-translation-map)
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314 (setq key-translation-map (make-sparse-keymap)))
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315 ;; Set up translations for all the characters that are used as
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316 ;; accent prefixes in this language.
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317 (setq tail iso-accents-list)
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318 (while tail
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319 (define-key key-translation-map (vector (car (car tail)))
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320 'iso-accents-accent-key)
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321 (setq tail (cdr tail))))))
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322
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323 (defun iso-accentuate (start end)
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324 "Convert two-character sequences in region into accented characters.
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325 Noninteractively, this operates on text from START to END.
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326 This uses the same conversion that ISO Accents mode uses for type-in."
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327 (interactive "r")
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328 (save-excursion
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329 (save-restriction
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330 (narrow-to-region start end)
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331 (goto-char start)
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332 (forward-char 1)
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333 (let (entry)
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334 (while (< (point) end)
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335 (if (and (memq (preceding-char) iso-accents-enable)
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336 (setq entry (cdr (assq (following-char) (assq (preceding-char) iso-accents-list)))))
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337 (progn
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338 (forward-char -1)
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339 (delete-char 2)
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340 (insert entry)
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341 (setq end (1- end)))
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342 (forward-char 1)))))))
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343
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344 (defun iso-accent-rassoc-unit (value alist)
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345 (let (elt acc)
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346 (while (and alist (not elt))
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347 (setq acc (car (car alist))
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348 elt (car (rassq value (cdr (car alist))))
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349 alist (cdr alist)))
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350 (if elt
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351 (cons acc elt))))
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352
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353 (defun iso-unaccentuate (start end)
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354 "Convert accented characters in the region into two-character sequences.
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355 Noninteractively, this operates on text from START to END.
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356 This uses the opposite of the conversion done by ISO Accents mode for type-in."
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357 (interactive "r")
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358 (save-excursion
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359 (save-restriction
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360 (narrow-to-region start end)
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361 (goto-char start)
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362 (let (entry)
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363 (while (< (point) end)
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364 (if (and (> (following-char) 127)
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365 (setq entry (iso-accent-rassoc-unit (following-char)
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366 iso-accents-list)))
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367 (progn
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368 (delete-char 1)
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369 (insert (car entry) (cdr entry))
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370 (setq end (1+ end)))
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371 (forward-char 1)))))))
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372
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373 (defun iso-deaccentuate (start end)
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374 "Convert accented characters in the region into unaccented characters.
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375 Noninteractively, this operates on text from START to END."
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376 (interactive "r")
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377 (save-excursion
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378 (save-restriction
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379 (narrow-to-region start end)
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380 (goto-char start)
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381 (let (entry)
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382 (while (< (point) end)
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383 (if (and (> (following-char) 127)
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384 (setq entry (iso-accent-rassoc-unit (following-char)
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385 iso-accents-list)))
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386 (progn
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387 (delete-char 1)
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388 (insert (cdr entry)))
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389 (forward-char 1)))))))
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390
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391 ;; Set up the default settings.
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392 (iso-accents-customize "latin-1")
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393
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394 ;; Use Iso-Accents mode in the minibuffer
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395 ;; if it was in use in the previous buffer.
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396 (defun iso-acc-minibuf-setup ()
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397 (setq iso-accents-mode
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398 (save-excursion
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399 (set-buffer (window-buffer minibuffer-scroll-window))
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400 iso-accents-mode)))
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401
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402 (add-hook 'minibuf-setup-hook 'iso-acc-minibuf-setup)
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403
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404 ;;; iso-acc.el ends here