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1 ;;; mule-charset.el --- Charset functions for Mule.
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2
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3 ;; Copyright (C) 1992 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Amdahl Corporation.
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5 ;; Copyright (C) 1996 Sun Microsystems.
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6
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7 ;; Author: Unknown
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8 ;; Keywords: i18n, mule, internal
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Synched up with: Not synched. API at source level synched with FSF 20.3.9.
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28
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29 ;;; Commentary:
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30
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31 ;; These functions are not compatible at the bytecode level with Emacs/Mule,
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32 ;; and they never will be. -sb [1999-05-26]
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33
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34 ;;; Code:
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35
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36 ;;;; Classifying text according to charsets
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37
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38 (defun charsets-in-region (start end &optional buffer)
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39 "Return a list of the charsets in the region between START and END.
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40 BUFFER defaults to the current buffer if omitted."
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41 (let (list)
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42 (save-excursion
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43 (if buffer
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44 (set-buffer buffer))
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45 (save-restriction
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46 (narrow-to-region start end)
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47 (goto-char (point-min))
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48 (while (not (eobp))
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49 (let* (prev-charset
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50 (ch (char-after (point)))
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51 (charset (char-charset ch)))
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52 (if (not (eq prev-charset charset))
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53 (progn
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54 (setq prev-charset charset)
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55 (or (memq charset list)
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56 (setq list (cons charset list))))))
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57 (forward-char))))
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58 list))
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59
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60 (defun charsets-in-string (string)
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61 "Return a list of the charsets in STRING."
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62 (let ((i 0)
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63 (len (length string))
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64 prev-charset charset list)
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65 (while (< i len)
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66 (setq charset (char-charset (aref string i)))
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67 (if (not (eq prev-charset charset))
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68 (progn
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69 (setq prev-charset charset)
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70 (or (memq charset list)
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71 (setq list (cons charset list)))))
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72 (setq i (1+ i)))
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73 list))
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74
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75
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76 ;;;; Charset accessors
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77
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78 (defun charset-iso-graphic-plane (charset)
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79 "Return the `graphic' property of CHARSET.
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80 See `make-charset'."
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81 (charset-property charset 'graphic))
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82
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83 (defun charset-iso-final-char (charset)
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84 "Return the final byte of the ISO 2022 escape sequence designating CHARSET."
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85 (charset-property charset 'final))
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86
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87 (defun charset-chars (charset)
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88 "Return the number of characters per dimension of CHARSET."
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89 (charset-property charset 'chars))
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90
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91 (defun charset-width (charset)
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92 "Return the number of display columns per character of CHARSET.
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93 This only applies to TTY mode (under X, the actual display width can
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94 be automatically determined)."
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95 (charset-property charset 'columns))
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96
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97 ;; #### FSFmacs returns 0
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98 (defun charset-direction (charset)
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99 "Return the display direction (0 for `l2r' or 1 for `r2l') of CHARSET.
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100 Only left-to-right is currently implemented."
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101 (if (eq (charset-property charset 'direction) 'l2r)
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102 0
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103 1))
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104
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105 ;; Not in Emacs/Mule
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106 (defun charset-registry (charset)
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107 "Return the registry of CHARSET.
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108 This is a regular expression matching the registry field of fonts
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109 that can display the characters in CHARSET."
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110 (charset-property charset 'registry))
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111
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112 (defun charset-ccl-program (charset)
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113 "Return the CCL program of CHARSET.
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114 See `make-charset'."
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115 (charset-property charset 'ccl-program))
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116
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117 (defun charset-bytes (charset)
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118 "Useless in XEmacs, returns 1."
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119 1)
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120
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121 (define-obsolete-function-alias 'charset-columns 'charset-width) ;; 19990409
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122 (define-obsolete-function-alias 'charset-final 'charset-iso-final-char) ;; 19990409
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123 (define-obsolete-function-alias 'charset-graphic 'charset-iso-graphic-plane) ;; 19990409
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124 (define-obsolete-function-alias 'charset-doc-string 'charset-description) ;; 19990409
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125
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126 ;;;; Define setf methods for all settable Charset properties
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127
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128 (defsetf charset-registry set-charset-registry)
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129 (defsetf charset-ccl-program set-charset-ccl-program)
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130
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131 ;;; FSF compatibility functions
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132 (defun charset-after (&optional pos)
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133 "Return charset of a character in current buffer at position POS.
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134 If POS is nil, it defauls to the current point.
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135 If POS is out of range, the value is nil."
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136 (when (null pos)
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137 (setq pos (point)))
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138 (check-argument-type 'integerp pos)
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139 (unless (or (< pos (point-min))
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140 (> pos (point-max)))
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141 (char-charset (char-after pos))))
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142
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143 ;; Yuck!
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144 ;; We're not going to support this.
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145 ;(defun charset-info (charset)
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146 ; "Return a vector of information of CHARSET.
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147 ;The elements of the vector are:
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148 ; CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION,
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149 ; LEADING-CODE-BASE, LEADING-CODE-EXT,
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150 ; ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE,
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151 ; REVERSE-CHARSET, SHORT-NAME, LONG-NAME, DESCRIPTION,
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152 ; PLIST,
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153 ;where
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154 ;CHARSET-ID (integer) is the identification number of the charset.
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155 ;BYTES (integer) is the length of multi-byte form of a character in
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156 ; the charset: one of 1, 2, 3, and 4.
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157 ;DIMENSION (integer) is the number of bytes to represent a character of
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158 ;the charset: 1 or 2.
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159 ;CHARS (integer) is the number of characters in a dimension: 94 or 96.
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160 ;WIDTH (integer) is the number of columns a character in the charset
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161 ; occupies on the screen: one of 0, 1, and 2.
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162 ;DIRECTION (integer) is the rendering direction of characters in the
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163 ; charset when rendering. If 0, render from left to right, else
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164 ; render from right to left.
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165 ;LEADING-CODE-BASE (integer) is the base leading-code for the
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166 ; charset.
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167 ;LEADING-CODE-EXT (integer) is the extended leading-code for the
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168 ; charset. All charsets of less than 0xA0 has the value 0.
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169 ;ISO-FINAL-CHAR (character) is the final character of the
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170 ; corresponding ISO 2022 charset.
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171 ;ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked
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172 ; while encoding to variants of ISO 2022 coding system, one of the
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173 ; following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR).
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174 ;REVERSE-CHARSET (integer) is the charset which differs only in
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175 ; LEFT-TO-RIGHT value from the charset. If there's no such a
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176 ; charset, the value is -1.
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177 ;SHORT-NAME (string) is the short name to refer to the charset.
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178 ;LONG-NAME (string) is the long name to refer to the charset
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179 ;DESCRIPTION (string) is the description string of the charset.
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180 ;PLIST (property list) may contain any type of information a user
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181 ; want to put and get by functions `put-charset-property' and
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182 ; `get-charset-property' respectively."
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183 ; (vector
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184 ; (charset-id charset)
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185 ; 1
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186 ; (charset-dimension charset)
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187 ; (charset-chars charset)
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188 ; (charset-width charset)
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189 ; (charset-direction charset)
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190 ; nil ;; (charset-leading-code-base (charset))
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191 ; nil ;; (charset-leading-code-ext (charset))
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192 ; (charset-iso-final-char charset)
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193 ; (charset-iso-graphic-plane charset)
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194 ; -1
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195 ; (charset-short-name charset)
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196 ; (charset-long-name charset)
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197 ; (charset-description charset)
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198 ; (charset-plist charset)))
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199
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200 ;(make-compatible 'charset-info "Don't use this if you can help it.")
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201
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202 (defun define-charset (charset-id charset property-vector)
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203 "Define CHARSET-ID as the identification number of CHARSET with INFO-VECTOR.
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204 If CHARSET-ID is nil, it is decided automatically, which means CHARSET is
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205 treated as a private charset.
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206 INFO-VECTOR is a vector of the format:
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207 [DIMENSION CHARS WIDTH DIRECTION ISO-FINAL-CHAR ISO-GRAPHIC-PLANE
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208 SHORT-NAME LONG-NAME DESCRIPTION]
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209 The meanings of each elements is as follows:
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210 DIMENSION (integer) is the number of bytes to represent a character: 1 or 2.
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211 CHARS (integer) is the number of characters in a dimension: 94 or 96.
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212 WIDTH (integer) is the number of columns a character in the charset
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213 occupies on the screen: one of 0, 1, and 2.
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214
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215 DIRECTION (integer) is the rendering direction of characters in the
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216 charset when rendering. If 0, render from left to right, else
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217 render from right to left.
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218
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219 ISO-FINAL-CHAR (character) is the final character of the
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220 corresponding ISO 2022 charset.
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221
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222 ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked
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223 while encoding to variants of ISO 2022 coding system, one of the
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224 following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR).
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225
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226
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227 SHORT-NAME (string) is the short name to refer to the charset.
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228
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229 LONG-NAME (string) is the long name to refer to the charset.
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230
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231 DESCRIPTION (string) is the description string of the charset."
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232 (make-charset charset (aref property-vector 8)
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233 (list
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234 'short-name (aref property-vector 6)
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235 'long-name (aref property-vector 7)
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236 'dimension (aref property-vector 0)
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237 'columns (aref property-vector 2)
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238 'chars (aref property-vector 1)
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239 'final (aref property-vector 4)
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240 'graphic (aref property-vector 5)
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241 'direction (aref property-vector 3))))
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242
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243 (make-compatible 'define-charset "")
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244
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245 ;;; Charset property
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246
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247 (defalias 'get-charset-property 'get)
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248 (defalias 'put-charset-property 'put)
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249 (defalias 'charset-plist 'object-plist)
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250 (defalias 'set-charset-plist 'setplist)
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251
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252 ;;; mule-charset.el ends here
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