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1 ;;; mule-charset.el --- Charset functions for Mule.
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2 ;; Copyright (C) 1992 Free Software Foundation, Inc.
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3 ;; Copyright (C) 1995 Amdahl Corporation.
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4 ;; Copyright (C) 1996 Sun Microsystems.
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5
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6 ;; This file is part of XEmacs.
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7
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8 ;; XEmacs is free software; you can redistribute it and/or modify it
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9 ;; under the terms of the GNU General Public License as published by
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10 ;; the Free Software Foundation; either version 2, or (at your option)
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11 ;; any later version.
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12
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13 ;; XEmacs is distributed in the hope that it will be useful, but
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14 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 ;; General Public License for more details.
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17
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18 ;; You should have received a copy of the GNU General Public License
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19 ;; along with XEmacs; see the file COPYING. If not, write to the
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20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 ;; Boston, MA 02111-1307, USA.
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22
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23
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24 ;;;; Composite character support
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25
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26 (defun compose-region (start end &optional buffer)
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27 "Compose characters in the current region into one composite character.
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28 From a Lisp program, pass two arguments, START to END.
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29 The composite character replaces the composed characters.
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30 BUFFER defaults to the current buffer if omitted."
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31 (interactive "r")
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32 (let ((ch (make-composite-char (buffer-substring start end buffer))))
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33 (delete-region start end buffer)
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34 (insert-char ch nil nil buffer)))
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35
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36 (defun decompose-region (start end &optional buffer)
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37 "Decompose any composite characters in the current region.
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38 From a Lisp program, pass two arguments, START to END.
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39 This converts each composite character into one or more characters,
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40 the individual characters out of which the composite character was formed.
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41 Non-composite characters are left as-is. BUFFER defaults to the current
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42 buffer if omitted."
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43 (interactive "r")
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44 (save-excursion
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45 (set-buffer buffer)
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46 (save-restriction
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47 (narrow-to-region start end)
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48 (goto-char (point-min))
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49 (let ((compcharset (get-charset 'composite)))
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50 (while (< (point) (point-max))
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51 (let ((ch (char-after (point))))
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52 (if (eq compcharset (char-charset ch))
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53 (progn
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54 (delete-char 1)
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55 (insert (composite-char-string ch))))))))))
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56
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57
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58 ;;;; Classifying text according to charsets
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59
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60 (defun charsets-in-region (start end &optional buffer)
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61 "Return a list of the charsets in the region between START and END.
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62 BUFFER defaults to the current buffer if omitted."
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63 (let (list)
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64 (save-excursion
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65 (if buffer
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66 (set-buffer buffer))
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67 (save-restriction
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68 (narrow-to-region start end)
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69 (goto-char (point-min))
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70 (while (not (eobp))
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71 (let* (prev-charset
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72 (ch (char-after (point)))
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73 (charset (char-charset ch)))
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74 (if (not (eq prev-charset charset))
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75 (progn
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76 (setq prev-charset charset)
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77 (or (memq charset list)
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78 (setq list (cons charset list))))))
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79 (forward-char))))
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80 list))
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81
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82 (defun charsets-in-string (string)
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83 "Return a list of the charsets in STRING."
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84 (let ((i 0)
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85 (len (length string))
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86 prev-charset charset list)
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87 (while (< i len)
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88 (setq charset (char-charset (aref string i)))
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89 (if (not (eq prev-charset charset))
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90 (progn
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91 (setq prev-charset charset)
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92 (or (memq charset list)
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93 (setq list (cons charset list)))))
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94 (setq i (1+ i)))
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95 list))
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96
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97
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98 ;;;; Charset accessors
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99
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100 (defun charset-graphic (charset)
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101 "Return the `graphic' property of CHARSET.
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102 See `make-charset'."
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103 (charset-property charset 'graphic))
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104
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105 (defun charset-final (charset)
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106 "Return the final byte of the ISO 2022 escape sequence designating CHARSET."
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107 (charset-property charset 'final))
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108
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109 (defun charset-chars (charset)
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110 "Return the number of characters per dimension of CHARSET."
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111 (charset-property charset 'chars))
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112
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113 (defun charset-columns (charset)
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114 "Return the number of display columns per character of CHARSET.
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115 This only applies to TTY mode (under X, the actual display width can
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116 be automatically determined)."
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117 (charset-property charset 'columns))
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118
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119 (defun charset-direction (charset)
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120 "Return the display direction (`l2r' or `r2l') of CHARSET."
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121 (charset-property charset 'direction))
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122
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123 (defun charset-registry (charset)
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124 "Return the registry of CHARSET.
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125 This is a regular expression matching the registry field of fonts
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126 that can display the characters in CHARSET."
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127 (charset-property charset 'registry))
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128
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129 (defun charset-ccl-program (charset)
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130 "Return the CCL program of CHARSET.
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131 See `make-charset'."
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132 (charset-property charset 'ccl-program))
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133
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134 ;;;; Define setf methods for all settable Charset properties
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135
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136 (defsetf charset-registry set-charset-registry)
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137 (defsetf charset-ccl-program set-charset-ccl-program)
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