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1 ;;; mule-category.el --- category functions for XEmacs/Mule.
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2
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3 ;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Amdahl Corporation.
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5 ;; Copyright (C) 1995 Sun Microsystems.
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;; Functions for working with category tables, which are a particular
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27 ;; type of char table. Some function names / arguments should be
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28 ;; parallel with syntax tables.
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29
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30 ;; Written by Ben Wing <wing@666.com>. The initialization code
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31 ;; at the end of this file comes from Mule.
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32
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33 ;;; Code:
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34
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35 (defvar defined-category-hashtable (make-hashtable 50))
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36
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37 (defun define-category (designator doc-string)
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38 "Make a new category whose designator is DESIGNATOR.
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39 DESIGNATOR should be a visible letter of ' ' thru '~'.
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40 STRING is a doc string for the category.
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41 Letters of 'a' thru 'z' are already used or kept for the system."
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42 (check-argument-type 'category-designator-p designator)
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43 (check-argument-type 'stringp doc-string)
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44 (puthash designator doc-string defined-category-hashtable))
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45
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46 (defun undefine-category (designator)
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47 "Undefine DESIGNATOR as a designator for a category."
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48 (check-argument-type 'category-designator-p designator)
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49 (remhash designator defined-category-hashtable))
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50
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51 (defun defined-category-p (designator)
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52 "Return non-nil if DESIGNATOR is a designator for a defined category."
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53 (and (category-designator-p designator)
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54 (gethash designator defined-category-hashtable)))
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55
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56 (defun defined-category-list ()
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57 "Return a list of the currently defined categories.
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58 Categories are given by their designators."
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59 (let (list)
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60 (maphash #'(lambda (key value)
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61 (setq list (cons key list)))
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62 defined-category-hashtable)
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63 (nreverse list)))
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64
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65 (defun undefined-category-designator ()
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66 "Return an undefined category designator, or nil if there are none."
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67 (let ((a 32) found)
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68 (while (and (< a 127) (not found))
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69 (if (gethash a defined-category-hashtable)
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70 (setq found a))
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71 (setq a (1+ a)))
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72 found))
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73
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74 (defun category-doc-string (designator)
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75 "Return the doc-string for the category denoted by DESIGNATOR."
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76 (check-argument-type 'defined-category-p designator)
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77 (gethash designator defined-category-hashtable))
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78
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79 (defun modify-category-entry (char-range designator &optional table reset)
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80 "Add a category to the categories associated with CHAR-RANGE.
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81 CHAR-RANGE is a single character or a range of characters,
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82 as per `put-char-table'.
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83 The category is given by a designator character.
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84 The changes are made in TABLE, which defaults to the current buffer's
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85 category table.
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86 If optional fourth argument RESET is non-nil, previous categories associated
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87 with CHAR-RANGE are removed before adding the specified category."
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88 (or table (setq table (category-table)))
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89 (check-argument-type 'category-table-p table)
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90 (check-argument-type 'defined-category-p designator)
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91 (if reset
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92 ;; clear all existing stuff.
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93 (put-char-table char-range nil table))
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94 (map-char-table
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95 #'(lambda (key value)
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96 ;; make sure that this range has a bit-vector assigned to it,
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97 ;; and set the appropriate bit in that vector.
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98 (if (not (bit-vector-p value))
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99 (progn
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100 (setq value (make-bit-vector 95 0))
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101 (put-char-table key value table)))
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102 (aset value (- designator 32) 1))
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103 table char-range))
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104
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105 (defun char-category-list (char &optional table)
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106 "Return a list of the categories that CHAR is in.
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107 TABLE defaults to the current buffer's category table.
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108 The categories are given by their designators."
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109 (or table (setq table (category-table)))
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110 (check-argument-type 'category-table-p table)
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111 (let ((vec (get-char-table char table)))
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112 (if (null vec) nil
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113 (let ((a 32) list)
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114 (while (< a 127)
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115 (if (= 1 (aref vec (- a 32)))
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116 (setq list (cons a list)))
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117 (setq a (1+ a)))
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118 (nreverse list)))))
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119
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120 (defun char-in-category-p (char category &optional table)
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121 "Return non-nil if CHAR is in CATEGORY.
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122 TABLE defaults to the current buffer's category table.
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123 Categories are specified by their designators."
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124 (or table (setq table (category-table)))
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125 (check-argument-type 'category-table-p table)
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126 (check-argument-type 'category-designator-p category)
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127 (let ((vec (get-char-table char table)))
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128 (if (null vec) nil
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129 (= 1 (aref vec (- category 32))))))
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130
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131 (defun describe-category ()
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132 "Describe the category specifications in the category table.
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133 The descriptions are inserted in a buffer, which is then displayed."
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134 (interactive)
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135 (with-output-to-temp-buffer "*Help*"
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136 (describe-category-table (category-table) standard-output)))
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137
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138 (defun describe-category-table (table stream)
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139 (let (first-char
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140 last-char
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141 prev-val
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142 (describe-one
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143 (lambda (first last value stream)
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144 (if (and (bit-vector-p value)
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145 (> (reduce '+ value) 0))
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146 (progn
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147 (if (equal first last)
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148 (cond ((vectorp first)
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149 (princ (format "%s, row %d"
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150 (charset-name
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151 (aref first 0))
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152 (aref first 1))
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153 stream))
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154 ((charsetp first)
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155 (princ (charset-name first) stream))
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156 (t (princ first stream)))
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157 (cond ((vectorp first)
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158 (princ (format "%s, rows %d .. %d"
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159 (charset-name
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160 (aref first 0))
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161 (aref first 1)
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162 (aref last 1))
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163 stream))
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164 (t
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165 (princ (format "%s .. %s" first last)
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166 stream))))
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167 (describe-category-code value stream))))))
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168 (map-char-table
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169 (lambda (range value)
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170 (if (and (or
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171 (and (characterp range)
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172 (characterp first-char)
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173 (eq (char-charset range) (char-charset first-char))
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174 (= (char-int last-char) (1- (char-int range))))
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175 (and (vectorp range)
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176 (vectorp first-char)
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177 (eq (aref range 0) (aref first-char 0))
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178 (= (aref last-char 1) (1- (aref range 1))))
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179 (equal value prev-val)))
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180 (setq last-char range)
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181 (if first-char
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182 (progn
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183 (funcall describe-one first-char last-char prev-val stream)
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184 (setq first-char nil)))
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185 (funcall describe-one range range value stream))
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186 nil)
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187 table)
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188 (if first-char
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189 (funcall describe-one first-char last-char prev-val stream))))
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190
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191 (defun describe-category-code (code stream)
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192 (let ((standard-output (or stream standard-output)))
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193 (princ "\tin categories: ")
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194 (if (not (bit-vector-p code))
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195 (princ "(none)")
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196 (let ((i 0)
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197 already-matched)
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198 (while (< i 95)
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199 (if (= 1 (aref code i))
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200 (progn
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201 (if (not already-matched)
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202 (setq already-matched t)
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203 (princ " "))
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204 (princ (int-char (+ 32 i)))))
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205 (setq i (1+ i)))
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206 (if (not already-matched)
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207 (princ "(none)")))
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208 (let ((i 0))
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209 (while (< i 95)
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210 (if (= 1 (aref code i))
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211 (princ (format "\n\t\tmeaning: %s"
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212 (category-doc-string (int-char (+ 32 i))))))
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213 (setq i (1+ i)))))
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214 (terpri)))
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215
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216 (defconst predefined-category-list
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217 '((latin-1 ?l "Latin-1 through Latin-5 character set")
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218 (latin-2 ?l)
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219 (latin-3 ?l)
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220 (latin-4 ?l)
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221 (latin-5 ?l)
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222 (cyrillic ?y "Cyrillic character set")
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223 (arabic ?b "Arabic character set")
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224 (greek ?g "Greek character set")
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225 (hebrew ?w "Hebrew character set")
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226 (japanese-jisx0201-kana ?k "Japanese 1-byte Katakana character set")
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227 (japanese-jisx0201-roman ?r "Japanese 1-byte Roman character set")
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228 (japanese-jisx0208-1978 ?j "Japanese 2-byte character set (old)")
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229 (japanese-jisx0208 ?j "Japanese 2-byte character set")
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230 (japanese-jisx0212 ?j)
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231 (chinese-gb ?c "Chinese GB (China, PRC) 2-byte character set")
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232 (chinese-cns11643-1 ?t "Chinese Taiwan (CNS or Big5) 2-byte character set")
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233 (chinese-cns11643-2 ?t)
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234 (chinese-big5-1 ?t)
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235 (chinese-big5-2 ?t)
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236 (korean-ksc5601 ?h "Hangul (Korean) 2-byte character set")
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237 )
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238 "List of predefined categories.
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239 Each element is a list of a charset, a designator, and maybe a doc string.")
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240
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241 (let (i l)
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242 (define-category ?a "ASCII character set.")
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243 (setq i 32)
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244 (while (< i 127)
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245 (modify-category-entry i ?a)
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246 (setq i (1+ i)))
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247 (setq l predefined-category-list)
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248 (while l
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249 (if (nth 2 (car l))
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250 (define-category (nth 1 (car l)) (nth 2 (car l))))
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251 (modify-category-entry (car (car l)) (nth 1 (car l)))
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252 (setq l (cdr l))))
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253
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254 ;;; At the present, I know Japanese and Chinese text can
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255 ;;; break line at any point under a restriction of 'kinsoku'.
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256 (defvar word-across-newline "\\(\\cj\\|\\cc\\|\\ct\\)"
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257 "Regular expression of such characters which can be a word across newline.")
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