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155
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1 ;;; mule-cmds.el --- Commands for mulitilingual environment
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2
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3 ;; Copyright (C) 1995 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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5 ;; Copyright (C) 1997 MORIOKA Tomohiko
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6
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7 ;; Keywords: mule, multilingual
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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 Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Code:
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27
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28 ;;; MULE related key bindings and menus.
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29
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30 (defvar mule-keymap (make-sparse-keymap "MULE")
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31 "Keymap for MULE (Multilingual environment) specific commands.")
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32 (fset 'mule-prefix mule-keymap)
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33
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34 ;; Keep "C-x C-k ..." for mule specific commands.
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35 (define-key ctl-x-map "\C-k" 'mule-prefix)
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36
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37 (defvar mule-describe-language-support-map
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38 (make-sparse-keymap "Describe Language Support"))
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39 (fset 'mule-describe-language-support-prefix
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40 mule-describe-language-support-map)
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41
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42 (defvar mule-set-language-environment-map
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43 (make-sparse-keymap "Set Language Environment"))
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44 (fset 'mule-set-language-environment-prefix
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45 mule-set-language-environment-map)
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46
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47 (define-key mule-keymap "f" 'set-buffer-file-coding-system)
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48 (define-key mule-keymap "F" 'set-default-buffer-file-coding-system) ; XEmacs
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49 (define-key mule-keymap "t" 'set-terminal-coding-system)
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50 (define-key mule-keymap "k" 'set-keyboard-coding-system)
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51 (define-key mule-keymap "p" 'set-current-process-coding-system)
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52 (define-key mule-keymap "P" 'set-default-process-coding-system) ; XEmacs
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53 (define-key mule-keymap "i" 'select-input-method)
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54 (define-key mule-keymap "c" 'list-coding-system-briefly) ; XEmacs
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55 (define-key mule-keymap "C" 'list-coding-system) ; XEmacs
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56 (define-key mule-keymap "r" 'toggle-display-direction) ; XEmacs
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57
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58 (define-key help-map "\C-L" 'describe-language-support)
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59 (define-key help-map "\C-\\" 'describe-input-method)
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60 (define-key help-map "C" 'describe-current-coding-system)
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61 (define-key help-map "h" 'view-hello-file)
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62
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63 ;; Menu for XEmacs were moved to x11/x-menubar.el.
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64
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65
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66 ;; This should be a single character key binding because users use it
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67 ;; very frequently while editing multilingual text. Now we can use
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68 ;; only two such keys: "\C-\\" and "\C-^", but the latter is not
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69 ;; convenient because it requires shifting on most keyboards. An
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70 ;; alternative is "\C-\]" which is now bound to `abort-recursive-edit'
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71 ;; but it won't be used that frequently.
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72 (define-key global-map "\C-\\" 'toggle-input-method)
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73
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74 (defun view-hello-file ()
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75 "Display the HELLO file which list up many languages and characters."
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76 (interactive)
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77 (find-file-read-only (expand-file-name "HELLO" data-directory)))
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78
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79
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80 ;;; Language support staffs.
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81
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82 (defvar primary-language "English"
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83 "Name of a user's primary language.
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84 Emacs provide various language supports based on this variable.")
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85
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86 (defvar language-info-alist nil
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87 "Alist of language names vs the corresponding information of various kind.
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88 Each element looks like:
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89 (LANGUAGE-NAME . ((KEY . INFO) ...))
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90 where LANGUAGE-NAME is a string,
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91 KEY is a symbol denoting the kind of information,
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92 INFO is any Lisp object which contains the actual information related
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93 to KEY.")
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94
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95 (defun get-language-info (language-name key)
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96 "Return the information for LANGUAGE-NAME of the kind KEY.
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97 LANGUAGE-NAME is a string.
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98 KEY is a symbol denoting the kind of required information."
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99 (let ((lang-slot (assoc language-name language-info-alist)))
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100 (if lang-slot
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101 (cdr (assq key (cdr lang-slot))))))
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102
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103 ;; Return a lambda form which calls `describe-language-support' with
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104 ;; argument LANG.
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105 (defun build-describe-language-support-function (lang)
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106 `(lambda ()
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107 (interactive)
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108 (describe-language-support ,lang)))
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109
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110 ;; Return a lambda form which calls `set-language-environment' with
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111 ;; argument LANG.
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112 (defun build-set-language-environment-function (lang)
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113 `(lambda ()
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114 (interactive)
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115 (set-language-environment ,lang)))
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116
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117 (defun set-language-info (language-name key info)
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118 "Set for LANGUAGE-NAME the information INFO under KEY.
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119 LANGUAGE-NAME is a string
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120 KEY is a symbol denoting the kind of information.
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121 INFO is any Lisp object which contains the actual information.
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122
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123 Currently, the following KEYs are used by Emacs:
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124 charset: list of symbols whose values are charsets specific to the language.
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125 coding-system: list of coding systems specific to the langauge.
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126 setup-function: see the documentation of `set-language-environment'.
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127 tutorial: a tutorial file name written in the language.
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128 sample-text: one line short text containing characters of the language.
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129 documentation: a docstring describing how the language is supported,
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130 or a fuction to call to describe it,
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131 or t which means call `describe-language-support' to describe it.
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132 input-method: alist of input method names for the language vs information
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133 for activating them. Use `register-input-method' (which see)
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134 to add a new input method to the alist.
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135
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136 Emacs will use more KEYs in the future. To avoid the conflition, users
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137 should use prefix \"user-\" in the name of KEY."
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138 (let (lang-slot key-slot)
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139 (setq lang-slot (assoc language-name language-info-alist))
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140 (if (null lang-slot) ; If no slot for the language, add it.
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141 (setq lang-slot (list language-name)
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142 language-info-alist (cons lang-slot language-info-alist)))
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143 (setq key-slot (assq key lang-slot))
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144 (if (null key-slot) ; If no slot for the key, add it.
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145 (progn
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146 (setq key-slot (list key))
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147 (setcdr lang-slot (cons key-slot (cdr lang-slot)))))
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148 (setcdr key-slot info)
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149 ;; Setup menu.
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150 (cond ((eq key 'documentation)
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151 (define-key mule-describe-language-support-map
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152 (vector (intern language-name))
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153 (cons language-name
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154 (build-describe-language-support-function language-name))))
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155 ((eq key 'setup-function)
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156 (define-key mule-set-language-environment-map
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157 (vector (intern language-name))
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158 (cons language-name
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159 (build-set-language-environment-function language-name)))))
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160 ))
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161
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162 (defun set-language-info-alist (language-name alist)
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163 "Set for LANGUAGE-NAME the information in ALIST.
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164 ALIST is an alist of KEY and INFO. See the documentation of
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165 `set-langauge-info' for the meanings of KEY and INFO."
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166 (while alist
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167 (set-language-info language-name (car (car alist)) (cdr (car alist)))
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168 (setq alist (cdr alist))))
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169
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170 (defun read-language-name (key prompt &optional initial-input)
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171 "Read language name which has information for KEY, prompting with PROMPT."
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172 (let* ((completion-ignore-case t)
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173 (name (completing-read prompt
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174 language-info-alist
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175 (function (lambda (elm) (assq key elm)))
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176 t
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177 initial-input)))
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178 (and (> (length name) 0)
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179 (car (assoc-ignore-case (downcase name) language-info-alist)))))
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180
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181 ;;; Multilingual input methods.
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182
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183 (defvar current-input-method nil
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184 "The current input method for multilingual text.
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185 The value is a cons of language name and input method name.
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186 If nil, it means no input method is activated now.")
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187 (make-variable-buffer-local 'current-input-method)
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188 (put 'current-input-method 'permanent-local t)
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189
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190 (defvar current-input-method-title nil
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191 "Title string of the current input method shown in mode line.
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192 Every input method should set this an appropriate value when activated.")
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193 (make-variable-buffer-local 'current-input-method-title)
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194 (put 'current-input-method-title 'permanent-local t)
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195
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196 (defvar default-input-method nil
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197 "Default input method.
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198 The default input method is the one activated automatically by the command
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199 `toggle-input-method' (\\[toggle-input-method]).
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200 The value is a cons of language name and input method name.")
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201
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202 (defvar default-input-method-title nil
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203 "Title string of the default input method.")
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204
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205 (defvar previous-input-method nil
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206 "Input method selected previously.
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207 This is the one selected before the current input method is selected.
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208 See also the documentation of `default-input-method'.")
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209
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210 (defvar inactivate-current-input-method-function nil
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211 "Function to call for inactivating the current input method.
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212 Every input method should set this to an appropriate value when activated.
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213 This function is called with no argument.")
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214 (make-variable-buffer-local 'inactivate-current-input-method-function)
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215 (put 'inactivate-current-input-method-function 'permanent-local t)
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216
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217 (defvar describe-current-input-method-function nil
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218 "Function to call for describing the current input method.
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219 This function is called with no argument.")
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220 (make-variable-buffer-local 'describe-current-input-method-function)
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221 (put 'describe-current-input-method-function 'permanent-local t)
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222
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223 (defun register-input-method (language-name input-method)
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224 "Register INPUT-METHOD as an input method of LANGUAGE-NAME.
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225 LANGUAGE-NAME is a string.
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226 INPUT-METHOD is a list of the form:
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227 (METHOD-NAME ACTIVATE-FUNC ARG ...)
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228 where METHOD-NAME is the name of this method,
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229 ACTIVATE-FUNC is the function to call for activating this method.
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230 Arguments for the function are METHOD-NAME and ARGs."
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231 (let ((slot (get-language-info language-name 'input-method))
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232 method-slot)
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233 (if (null slot)
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234 (set-language-info language-name 'input-method (list input-method))
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235 (setq method-slot (assoc (car input-method) slot))
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236 (if method-slot
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237 (setcdr method-slot (cdr input-method))
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238 (set-language-info language-name 'input-method
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239 (cons input-method slot))))))
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240
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241 (defun read-language-and-input-method-name ()
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242 "Read a language names and the corresponding input method from a minibuffer.
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243 Return a cons of those names."
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244 (let ((language-name (read-language-name
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245 'input-method
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246 "Language: "
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247 (if previous-input-method
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248 (cons (car previous-input-method) 0)))))
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249 (if (null language-name)
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250 (error "No input method for the specified language"))
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251 (let* ((completion-ignore-case t)
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252 (key-slot (cdr (assq 'input-method
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253 (assoc language-name language-info-alist))))
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254 (method-name
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255 (completing-read "Input method: " key-slot nil t
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256 (if (and previous-input-method
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257 (string= language-name
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258 (car previous-input-method)))
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259 (cons (cdr previous-input-method) 0)))))
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260 (if (= (length method-name) 0)
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261 (error "No input method specified"))
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262 (list language-name
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263 (car (assoc-ignore-case (downcase method-name) key-slot))))))
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264
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265 (defun set-default-input-method (language-name method-name)
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266 "Set the default input method to METHOD-NAME for inputting LANGUAGE-NAME.
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267 The default input method is the one activated automatically by the command
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268 `toggle-input-method' (\\[toggle-input-method]).
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269 This doesn't affect the currently activated input method."
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270 (interactive (read-language-and-input-method-name))
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271 (let* ((key-slot (get-language-info language-name 'input-method))
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272 (method-slot (assoc method-name key-slot)))
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273 (if (null method-slot)
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274 (error "No input method `%s' for %s" method-name language-name))
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275 (setq default-input-method (cons language-name method-name))))
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276
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277 (defun select-input-method (language-name method-name)
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278 "Select and activate input method METHOD-NAME for inputting LANGUAGE-NAME.
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279 The information for activating METHOD-NAME is stored
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280 in `language-info-alist' under the key 'input-method.
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281 The format of the information has the form:
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282 ((METHOD-NAME ACTIVATE-FUNC ARG ...) ...)
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283 where ACTIVATE-FUNC is a function to call for activating this method.
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284 Arguments for the function are METHOD-NAME and ARGs."
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285 (interactive (read-language-and-input-method-name))
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286 (let* ((key-slot (get-language-info language-name 'input-method))
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287 (method-slot (assoc method-name key-slot)))
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288 (if (null method-slot)
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289 (error "No input method `%s' for %s" method-name language-name))
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290 (if current-input-method
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291 (progn
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292 (if (not (equal previous-input-method current-input-method))
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293 (setq previous-input-method current-input-method))
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294 (funcall inactivate-current-input-method-function)))
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295 (setq method-slot (cdr method-slot))
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296 (apply (car method-slot) method-name (cdr method-slot))
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297 (setq default-input-method
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298 (setq current-input-method (cons language-name method-name)))
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299 (setq default-input-method-title current-input-method-title)
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300 (setq current-input-method default-input-method)))
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301
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302 (defun toggle-input-method (&optional arg)
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303 "Toggle whether a multilingual input method is activated in this buffer.
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304 With arg, activate an input method specified interactively.
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305 Without arg, the method being activated is the one selected most recently,
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306 but if no input method has ever been selected, select one interactively."
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307 (interactive "P")
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308 (if arg
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309 (call-interactively 'select-input-method)
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310 (if (null current-input-method)
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311 (if default-input-method
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312 (select-input-method (car default-input-method)
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313 (cdr default-input-method))
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314 (call-interactively 'select-input-method))
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315 (funcall inactivate-current-input-method-function)
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316 (setq current-input-method nil))))
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317
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318 (defun describe-input-method ()
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319 "Describe the current input method."
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320 (interactive)
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321 (if current-input-method
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322 (if (and (symbolp describe-current-input-method-function)
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323 (fboundp describe-current-input-method-function))
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324 (funcall describe-current-input-method-function)
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325 (message "No way to describe the current input method `%s'"
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326 (cdr current-input-method))
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327 (ding))
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328 (message "No input method is activated now")
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329 (ding)))
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330
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331 ;; (defun read-multilingual-string (prompt &optional initial-input
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332 ;; language-name method-name)
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333 ;; "Read a multilingual string from minibuffer, prompting with string PROMPT.
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334 ;; The input method selected last time is activated in minibuffer.
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335 ;; If non-nil, second arg INITIAL-INPUT is a string to insert before reading.
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336 ;; Optional 3rd and 4th arguments LANGUAGE-NAME and METHOD-NAME specify
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337 ;; the input method to be activated instead of the one selected last time."
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338 ;; (let ((minibuffer-setup-hook '(toggle-input-method))
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339 ;; (default-input-method default-input-method))
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340 ;; (if (and language-name method-name)
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341 ;; (set-default-input-method language-name method-name))
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342 ;; (read-string prompt initial-input)))
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343
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344 ;; Variables to control behavior of input methods. All input methods
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345 ;; should react to these variables.
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346
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347 (defvar input-method-tersely-flag nil
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348 "*If this flag is non-nil, input method works rather tersely.
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349
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350 For instance, Quail input method does not show guidance buffer while
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351 inputting at minibuffer if this flag is t.")
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352
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353 ;; (defvar input-method-activate-hook nil
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354 ;; "Normal hook run just after an input method is activated.")
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355
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356 ;; (defvar input-method-inactivate-hook nil
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357 ;; "Normal hook run just after an input method is inactivated.")
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358
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359 ;; (defvar input-method-after-insert-chunk-hook nil
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360 ;; "Normal hook run just after an input method insert some chunk of text.")
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361
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362
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363 ;;; Language specific setup functions.
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364 ;; (defun set-language-environment (language-name)
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365 ;; "Setup a user's environment for LANGUAGE-NAME.
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366 ;;
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367 ;; To setup, a fucntion returned by:
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368 ;; (get-language-info LANGUAGE-NAME 'setup-function)
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369 ;; is called."
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370 ;; (interactive (list (read-language-name 'setup-function "Language: ")))
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371 ;; (let (func)
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372 ;; (if (or (null language-name)
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373 ;; (null (setq func
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374 ;; (get-language-info language-name 'setup-function))))
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375 ;; (error "No way to setup environment for the specified language"))
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376 ;; (funcall func)))
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377
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378 ;; Print all arguments with `princ', then print "\n".
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379 (defsubst princ-list (&rest args)
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380 (while args (princ (car args)) (setq args (cdr args)))
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381 (princ "\n"))
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382
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383 (defun describe-language-support (language-name)
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384 "Show documentation about how Emacs supports LANGUAGE-NAME."
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385 (interactive (list (read-language-name 'documentation "Language: ")))
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386 (let (doc)
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387 (if (or (null language-name)
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388 (null (setq doc
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389 (get-language-info language-name 'documentation))))
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390 (error "No documentation for the specified language"))
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391 (with-output-to-temp-buffer "*Help*"
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392 (if (not (eq doc t))
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393 (cond ((stringp doc)
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394 (princ doc))
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395 ((and (symbolp doc) (fboundp doc))
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396 (funcall doc))
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397 (t
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398 (error "Invalid documentation data for %s" language-name)))
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399 (princ-list "List of items specific to "
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400 language-name
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401 " environment")
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402 (princ "-----------------------------------------------------------\n")
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403 (let ((str (get-language-info language-name 'sample-text)))
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404 (if (stringp str)
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405 (progn
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406 (princ "<sample text>\n")
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407 (princ-list " " str))))
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408 (princ "<input methods>\n")
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409 (let ((l (get-language-info language-name 'input-method)))
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410 (while l
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411 (princ-list " " (car (car l)))
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412 (setq l (cdr l))))
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413 (princ "<character sets>\n")
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414 (let ((l (get-language-info language-name 'charset)))
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415 (if (null l)
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416 (princ-list " nothing specific to " language-name)
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417 (while l
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418 (princ-list " " (car l)
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419 (format ":%3d:\n\t" (charset-id (car l)))
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420 (charset-description (car l)))
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421 (setq l (cdr l)))))
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422 (princ "<coding systems>\n")
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423 (let ((l (get-language-info language-name 'coding-system)))
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424 (if (null l)
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425 (princ-list " nothing specific to " language-name)
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426 (while l
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427 (princ-list " " (car l) ":\n\t"
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428 (coding-system-docstring (car l)))
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429 (setq l (cdr l)))))))))
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430
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431 ;;; Charset property
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432
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433 ;; (defsubst get-charset-property (charset propname)
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434 ;; "Return the value of CHARSET's PROPNAME property.
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435 ;; This is the last value stored with
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436 ;; `(put-charset-property CHARSET PROPNAME VALUE)'."
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437 ;; (plist-get (charset-plist charset) propname))
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438
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439 ;; (defsubst put-charset-property (charset propname value)
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440 ;; "Store CHARSETS's PROPNAME property with value VALUE.
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441 ;; It can be retrieved with `(get-charset-property CHARSET PROPNAME)'."
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442 ;; (set-charset-plist charset
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443 ;; (plist-put (charset-plist charset) propname value)))
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444
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445 ;;; Character code property
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446 ;; (put 'char-code-property-table 'char-table-extra-slots 0)
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447
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448 ;; (defvar char-code-property-table
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449 ;; (make-char-table 'char-code-property-table)
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450 ;; "Char-table containing a property list of each character code.
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451 ;;
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452 ;; See also the documentation of `get-char-code-property' and
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453 ;; `put-char-code-property'")
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454
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455 ;; (defun get-char-code-property (char propname)
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456 ;; "Return the value of CHAR's PROPNAME property in `char-code-property-table'."
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457 ;; (let ((plist (aref char-code-property-table char)))
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458 ;; (if (listp plist)
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459 ;; (car (cdr (memq propname plist))))))
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460
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461 ;; (defun put-char-code-property (char propname value)
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462 ;; "Store CHAR's PROPNAME property with VALUE in `char-code-property-table'.
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463 ;; It can be retrieved with `(get-char-code-property CHAR PROPNAME)'."
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464 ;; (let ((plist (aref char-code-property-table char)))
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465 ;; (if plist
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466 ;; (let ((slot (memq propname plist)))
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467 ;; (if slot
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468 ;; (setcar (cdr slot) value)
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469 ;; (nconc plist (list propname value))))
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470 ;; (aset char-code-property-table char (list propname value)))))
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471
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472 (provide 'mule-cmds)
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473
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474 ;;; mule-cmds.el ends here
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