1 | ;;; mcharset.el --- MIME charset API |
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2 | |
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3 | ;; Copyright (C) 1997,1998,1999,2000 Free Software Foundation, Inc. |
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4 | |
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5 | ;; Author: MORIOKA Tomohiko <tomo@m17n.org> |
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6 | ;; Keywords: emulation, compatibility, Mule |
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7 | |
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8 | ;; This file is part of APEL (A Portable Emacs Library). |
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9 | |
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10 | ;; This program is free software; you can redistribute it and/or |
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11 | ;; modify it under the terms of the GNU General Public License as |
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12 | ;; published by the Free Software Foundation; either version 2, or (at |
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13 | ;; your option) any later version. |
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14 | |
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15 | ;; This program is distributed in the hope that it will be useful, but |
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16 | ;; WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | ;; General Public License for more details. |
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19 | |
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20 | ;; You should have received a copy of the GNU General Public License |
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21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
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22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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23 | ;; Boston, MA 02111-1307, USA. |
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24 | |
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25 | ;;; Code: |
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26 | |
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27 | (require 'poe) |
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28 | (require 'pcustom) |
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29 | |
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30 | (cond ((featurep 'mule) |
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31 | (if (>= emacs-major-version 20) |
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32 | (require 'mcs-20) |
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33 | ;; for MULE 1.* and 2.* |
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34 | (require 'mcs-om))) |
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35 | ((boundp 'NEMACS) |
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36 | ;; for Nemacs and Nepoch |
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37 | (require 'mcs-nemacs)) |
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38 | (t |
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39 | (require 'mcs-ltn1))) |
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40 | |
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41 | (defcustom default-mime-charset-for-write |
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42 | (if (mime-charset-p 'utf-8) |
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43 | 'utf-8 |
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44 | default-mime-charset) |
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45 | "Default value of MIME-charset for encoding. |
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46 | It may be used when suitable MIME-charset is not found. |
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47 | It must be symbol." |
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48 | :group 'i18n |
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49 | :type 'mime-charset) |
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50 | |
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51 | (defcustom default-mime-charset-detect-method-for-write |
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52 | nil |
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53 | "Function called when suitable MIME-charset is not found to encode. |
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54 | It must be nil or function. |
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55 | If it is nil, variable `default-mime-charset-for-write' is used. |
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56 | If it is a function, interface must be (TYPE CHARSETS &rest ARGS). |
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57 | CHARSETS is list of charset. |
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58 | If TYPE is 'region, ARGS has START and END." |
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59 | :group 'i18n |
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60 | :type '(choice function (const nil))) |
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61 | |
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62 | (defun charsets-to-mime-charset (charsets) |
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63 | "Return MIME charset from list of charset CHARSETS. |
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64 | Return nil if suitable mime-charset is not found." |
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65 | (if charsets |
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66 | (catch 'tag |
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67 | (let ((rest charsets-mime-charset-alist) |
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68 | cell) |
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69 | (while (setq cell (car rest)) |
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70 | (if (catch 'not-subset |
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71 | (let ((set1 charsets) |
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72 | (set2 (car cell)) |
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73 | obj) |
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74 | (while set1 |
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75 | (setq obj (car set1)) |
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76 | (or (memq obj set2) |
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77 | (throw 'not-subset nil)) |
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78 | (setq set1 (cdr set1))) |
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79 | t)) |
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80 | (throw 'tag (cdr cell))) |
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81 | (setq rest (cdr rest))) |
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82 | )))) |
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83 | |
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84 | (defun find-mime-charset-by-charsets (charsets &optional mode &rest args) |
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85 | "Like `charsets-to-mime-charset', but it does not return nil. |
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86 | |
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87 | When suitable mime-charset is not found and variable |
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88 | `default-mime-charset-detect-method-for-write' is not nil, |
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89 | `find-mime-charset-by-charsets' calls the variable as function and |
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90 | return the return value of the function. |
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91 | Interface of the function is (MODE CHARSETS &rest ARGS). |
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92 | |
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93 | When suitable mime-charset is not found and variable |
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94 | `default-mime-charset-detect-method-for-write' is nil, |
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95 | variable `default-mime-charset-for-write' is returned." |
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96 | (or (charsets-to-mime-charset charsets) |
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97 | (if default-mime-charset-detect-method-for-write |
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98 | (apply default-mime-charset-detect-method-for-write |
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99 | mode charsets args) |
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100 | default-mime-charset-for-write))) |
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101 | |
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102 | |
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103 | ;;; @ end |
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104 | ;;; |
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105 | |
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106 | (require 'product) |
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107 | (product-provide (provide 'mcharset) (require 'apel-ver)) |
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108 | |
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109 | ;;; mcharset.el ends here |
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