lisp/international/fontset.el

   1 ;;; fontset.el --- commands for handling fontset
   2
   3 ;; Copyright (C) 1995, 1997 Electrotechnical Laboratory, JAPAN.
   4 ;; Licensed to the Free Software Foundation.
   5 ;; Copyright (C) 2001 Free Software Foundation, Inc.
   6
   7 ;; Keywords: mule, multilingual, fontset
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 ;; Set standard fontname specification of characters in the default
  31 ;; fontset to find an appropriate font for each charset.  This is used
  32 ;; to generate a font name for a fontset if the fontset doesn't
  33 ;; specify a font name for a specific character.  The specification
  34 ;; has the form (FAMILY . REGISTRY).  FAMILY may be nil, in which
  35 ;; case, the family name of default face is used.  If REGISTRY
  36 ;; contains a character `-', the string before that is embedded in
  37 ;; `CHARSET_REGISTRY' field, and the string after that is embedded in
  38 ;; `CHARSET_ENCODING' field.  If it does not contain `-', the whole
  39 ;; string is embedded in `CHARSET_REGISTRY' field, and a wild card
  40 ;; character `*' is embedded in `CHARSET_ENCODING' field.  The
  41 ;; REGISTRY for ASCII characters are predefined as "ISO8859-1".
  42
  43 (defun setup-default-fontset ()
  44   "Setup the default fontset."
  45   (dolist
  46       (elt
  47        ;; Eval this at compile-time, since fontset.el is always loaded
  48        ;; when run under X and this would always load ind-util.el as well.
  49        (eval-when-compile
  50          `((latin-iso8859-1 . (nil . "ISO8859-1"))
  51            (latin-iso8859-2 . (nil . "ISO8859-2"))
  52            (latin-iso8859-3 . (nil . "ISO8859-3"))
  53            (latin-iso8859-4 . (nil . "ISO8859-4"))
  54            (thai-tis620 . ("*" . "TIS620"))
  55            (greek-iso8859-7 . ("*" . "ISO8859-7"))
  56            (arabic-iso8859-6 . ("*" . "ISO8859-6"))
  57            (hebrew-iso8859-8 . ("*" . "ISO8859-8"))
  58            (katakana-jisx0201 . ("*" . "JISX0201"))
  59            (latin-jisx0201 . (nil . "JISX0201"))
  60            (cyrillic-iso8859-5 . ("*" . "ISO8859-5"))
  61            (latin-iso8859-9 . (nil . "ISO8859-9"))
  62            (japanese-jisx0208-1978 . ("*" . "JISX0208.1978"))
  63            (chinese-gb2312 . ("*" . "GB2312.1980"))
  64            (japanese-jisx0208 . ("*" . "JISX0208.1990"))
  65            (korean-ksc5601 . ("*" . "KSC5601.1989"))
  66            (japanese-jisx0212 . ("*" . "JISX0212"))
  67            (chinese-cns11643-1 . ("*" . "CNS11643.1992-1"))
  68            (chinese-cns11643-2 . ("*" . "CNS11643.1992-2"))
  69            (chinese-cns11643-3 . ("*" . "CNS11643.1992-3"))
  70            (chinese-cns11643-4 . ("*" . "CNS11643.1992-4"))
  71            (chinese-cns11643-5 . ("*" . "CNS11643.1992-5"))
  72            (chinese-cns11643-6 . ("*" . "CNS11643.1992-6"))
  73            (chinese-cns11643-7 . ("*" . "CNS11643.1992-7"))
  74            (chinese-big5-1 . ("*" . "Big5"))
  75            (chinese-big5-2 . ("*" . "Big5"))
  76            (chinese-sisheng . (nil . "sisheng_cwnn"))
  77            (vietnamese-viscii-lower . (nil . "VISCII1.1"))
  78            (vietnamese-viscii-upper . (nil . "VISCII1.1"))
  79            (arabic-digit . ("*" . "MuleArabic-0"))
  80            (arabic-1-column . ("*" . "MuleArabic-1"))
  81            (arabic-2-column . ("*" . "MuleArabic-2"))
  82            (ipa . (nil . "MuleIPA"))
  83            (ethiopic . ("*" . "Ethiopic-Unicode"))
  84            (ascii-right-to-left . (nil . "ISO8859-1"))
  85            (indian-is13194 . ("*" . "IS13194-Devanagari"))
  86            (indian-2-column . ("*" . "MuleIndian-2"))
  87            (lao . ("*" . "MuleLao-1"))
  88            (tibetan . ("proportional" . "MuleTibetan-2"))
  89            (tibetan-1-column . ("*" . "MuleTibetan-1"))
  90            (latin-iso8859-14 . (nil . "ISO8859-14"))
  91            (latin-iso8859-15 . (nil . "ISO8859-15"))
  92            (mule-unicode-0100-24ff . (nil . "ISO10646-1"))
  93            (mule-unicode-2500-33ff . (nil . "ISO10646-1"))
  94            (mule-unicode-e000-ffff . (nil . "ISO10646-1"))
  95            (japanese-jisx0213-1 . ("*" . "JISX0213.2000-1"))
  96            (japanese-jisx0213-2 . ("*" . "JISX0213.2000-2"))
  97            ;; unicode
  98            ((,(decode-char 'ucs #x0900)
  99              . ,(decode-char 'ucs #x097F)) . ("*" . "ISO10646.indian-1"))
 100            ;; indian
 101            (indian-glyph . ("*" . "Devanagari-CDAC"))
 102            ((,(indian-glyph-char 0 'devanagari)
 103              . ,(indian-glyph-char 255 'devanagari)) . ("*" . "Devanagari-CDAC"))
 104            ((,(indian-glyph-char 0 'sanskrit)
 105              . ,(indian-glyph-char 255 'sanskrit)) . ("*" . "Sanskrit-CDAC"))
 106            ((,(indian-glyph-char 0 'bengali)
 107              . ,(indian-glyph-char 255 'bengali)) . ("*" . "Bengali-CDAC"))
 108            ((,(indian-glyph-char 0 'assamese)
 109              . ,(indian-glyph-char 255 'assamese)) . ("*" . "Assamese-CDAC"))
 110            ((,(indian-glyph-char 0 'punjabi)
 111              . ,(indian-glyph-char 255 'punjabi)) . ("*" . "Punjabi-CDAC"))
 112            ((,(indian-glyph-char 0 'gujarati)
 113              . ,(indian-glyph-char 255 'gujarati)) . ("*" . "Gujarati-CDAC"))
 114            ((,(indian-glyph-char 0 'oriya)
 115              . ,(indian-glyph-char 255 'oriya)) . ("*" . "Oriya-CDAC"))
 116            ((,(indian-glyph-char 0 'tamil)
 117              . ,(indian-glyph-char 255 'tamil)) . ("*" . "Tamil-CDAC"))
 118            ((,(indian-glyph-char 0 'telugu)
 119              . ,(indian-glyph-char 255 'telugu)) . ("*" . "Telugu-CDAC"))
 120            ((,(indian-glyph-char 0 'kannada)
 121              . ,(indian-glyph-char 255 'kannada)) . ("*" . "Kannada-CDAC"))
 122            ((,(indian-glyph-char 0 'malayalam)
 123              . ,(indian-glyph-char 255 'malayalam)) . ("*" . "Malayalam-CDAC"))
 124            )))
 125     (set-fontset-font "fontset-default" (car elt) (cdr elt))))
 126
 127 ;; Set arguments in `font-encoding-alist' (which see).
 128 (defun set-font-encoding (pattern charset encoding)
 129   (let ((slot (assoc pattern font-encoding-alist)))
 130     (if slot
 131         (let ((place (assq charset (cdr slot))))
 132           (if place
 133               (setcdr place encoding)
 134             (setcdr slot (cons (cons charset encoding) (cdr slot)))))
 135       (setq font-encoding-alist
 136             (cons (list pattern (cons charset encoding)) font-encoding-alist)))
 137     ))
 138
 139 ;; Allow display of arbitrary characters with an iso-10646-encoded
 140 ;; (`Unicode') font.
 141 (define-translation-table 'ucs-mule-to-mule-unicode
 142   ucs-mule-to-mule-unicode)
 143 (define-translation-hash-table 'ucs-mule-cjk-to-unicode
 144   ucs-mule-cjk-to-unicode)
 145
 146 (define-ccl-program ccl-encode-unicode-font
 147   `(0
 148     ;; r0: charset-id
 149     ;; r1: 1st position code
 150     ;; r2: 2nd position code (if r0 is 2D charset)
 151     ((if (r0 == ,(charset-id 'ascii))
 152          ((r2 = r1)
 153           (r1 = 0))
 154        ;; At first, try to get a Unicode code point directly.
 155        ((if (r2 >= 0)
 156             ;; This is a 2D charset.
 157             (r1 = ((r1 << 7) | r2)))
 158         (lookup-character ucs-mule-cjk-to-unicode r0 r1)
 159         (if r7
 160             ;; We got it!
 161             ((r1 = (r0 >> 8))
 162              (r2 = (r0 & #xFF)))
 163           ;; Look for a translation for non-ASCII chars.
 164           ((translate-character ucs-mule-to-mule-unicode r0 r1)
 165            (if (r0 == ,(charset-id 'latin-iso8859-1))
 166                ((r2 = (r1 + 128))
 167                 (r1 = 0))
 168              ((r2 = (r1 & #x7F))
 169               (r1 >>= 7)
 170               (if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
 171                   ((r1 *= 96)
 172                    (r1 += r2)
 173                    (r1 += ,(- #x100 (* 32 96) 32))
 174                    (r1 >8= 0)
 175                    (r2 = r7))
 176                 (if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
 177                     ((r1 *= 96)
 178                      (r1 += r2)
 179                      (r1 += ,(- #x2500 (* 32 96) 32))
 180                      (r1 >8= 0)
 181                      (r2 = r7))
 182                   (if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
 183                       ((r1 *= 96)
 184                        (r1 += r2)
 185                        (r1 += ,(- #xe000 (* 32 96) 32))
 186                        (r1 >8= 0)
 187                        (r2 = r7))
 188                     ;; No way, use the glyph for U+FFFD.
 189                     ((r1 = #xFF)
 190                      (r2 = #xFD)))))))))))))
 191   "Encode characters for display with iso10646 font.
 192 Translate through the translation-hash-table named
 193 `ucs-mule-cjk-to-unicode' and the translation-table named
 194 `ucs-mule-to-mule-unicode' initially.")
 195
 196 ;; Use the above CCL encoder for Unicode fonts.  Please note that the
 197 ;; regexp is not simply "ISO10646-1" because there exists, for
 198 ;; instance, the following Devanagari Unicode fonts:
 199 ;;      -misc-fixed-medium-r-normal--24-240-72-72-c-120-iso10646.indian-1
 200 ;;      -sibal-devanagari-medium-r-normal--24-240-75-75-P--iso10646-dev
 201 (setq font-ccl-encoder-alist
 202       (cons '("ISO10646.*-*" . ccl-encode-unicode-font)
 203             font-ccl-encoder-alist))
 204
 205 ;; Setting for suppressing XLoadQueryFont on big fonts.
 206 (setq x-pixel-size-width-font-regexp
 207       "gb2312\\|jisx0208\\|ksc5601\\|cns11643\\|big5")
 208
 209 ;; These fonts require vertical centering.
 210 (setq vertical-centering-font-regexp
 211       "gb2312\\|jisx0208\\|jisx0212\\|ksc5601\\|cns11643\\|big5")
 212
 213 (defvar x-font-name-charset-alist
 214   '(("iso8859-1" ascii latin-iso8859-1)
 215     ("iso8859-2" ascii latin-iso8859-2)
 216     ("iso8859-3" ascii latin-iso8859-3)
 217     ("iso8859-4" ascii latin-iso8859-4)
 218     ("iso8859-5" ascii cyrillic-iso8859-5)
 219     ("iso8859-6" ascii arabic-iso8859-6)
 220     ("iso8859-7" ascii greek-iso8859-7)
 221     ("iso8859-8" ascii hebrew-iso8859-8)
 222     ("iso8859-14" ascii latin-iso8859-14)
 223     ("iso8859-15" ascii latin-iso8859-15)
 224     ("tis620" ascii thai-tis620)
 225     ("koi8" ascii cyrillic-iso8859-5)
 226     ("viscii" ascii vietnamese-viscii-upper vietnamese-viscii-lower)
 227     ("vscii" ascii vietnamese-viscii-upper vietnamese-viscii-lower)
 228     ("mulelao-1" ascii lao)
 229     ("iso10646-1" ascii latin-iso8859-1 mule-unicode-0100-24ff
 230      mule-unicode-2500-33ff mule-unicode-e000-ffff))
 231   "Alist of font names vs list of charsets the font can display.
 232
 233 When a font name which matches some element of this alist is given as
 234 `-fn' command line argument or is specified by X resource, a fontset
 235 which uses the specified font for the corresponding charsets are
 236 created and used for the initial frame.")
 237
 238 ;;; XLFD (X Logical Font Description) format handler.
 239
 240 ;; Define XLFD's field index numbers.           ; field name
 241 (defconst xlfd-regexp-foundry-subnum 0)         ; FOUNDRY
 242 (defconst xlfd-regexp-family-subnum 1)          ; FAMILY_NAME
 243 (defconst xlfd-regexp-weight-subnum 2)          ; WEIGHT_NAME
 244 (defconst xlfd-regexp-slant-subnum 3)           ; SLANT
 245 (defconst xlfd-regexp-swidth-subnum 4)          ; SETWIDTH_NAME
 246 (defconst xlfd-regexp-adstyle-subnum 5)         ; ADD_STYLE_NAME
 247 (defconst xlfd-regexp-pixelsize-subnum 6)       ; PIXEL_SIZE
 248 (defconst xlfd-regexp-pointsize-subnum 7)       ; POINT_SIZE
 249 (defconst xlfd-regexp-resx-subnum 8)            ; RESOLUTION_X
 250 (defconst xlfd-regexp-resy-subnum 9)            ; RESOLUTION_Y
 251 (defconst xlfd-regexp-spacing-subnum 10)        ; SPACING
 252 (defconst xlfd-regexp-avgwidth-subnum 11)       ; AVERAGE_WIDTH
 253 (defconst xlfd-regexp-registry-subnum 12)       ; CHARSET_REGISTRY
 254 (defconst xlfd-regexp-encoding-subnum 13)       ; CHARSET_ENCODING
 255
 256 ;; Regular expression matching against a fontname which conforms to
 257 ;; XLFD (X Logical Font Description).  All fields in XLFD should be
 258 ;; not be omitted (but can be a wild card) to be matched.
 259 (defconst xlfd-tight-regexp
 260   "^\
 261 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
 262 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
 263 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)$")
 264
 265 ;; List of field numbers of XLFD whose values are numeric.
 266 (defconst xlfd-regexp-numeric-subnums
 267   (list xlfd-regexp-pixelsize-subnum    ;6
 268         xlfd-regexp-pointsize-subnum    ;7
 269         xlfd-regexp-resx-subnum         ;8
 270         xlfd-regexp-resy-subnum         ;9
 271         xlfd-regexp-avgwidth-subnum     ;11
 272         ))
 273
 274 (defun x-decompose-font-name (pattern)
 275   "Decompose PATTERN into XLFD's fields and return vector of the fields.
 276 The length of the vector is 14.
 277
 278 If PATTERN doesn't conform to XLFD, try to get a full XLFD name from
 279 X server and use the information of the full name to decompose
 280 PATTERN.  If no full XLFD name is gotten, return nil."
 281   (let (xlfd-fields fontname)
 282     (if (string-match xlfd-tight-regexp pattern)
 283         (let ((i 0))
 284           (setq xlfd-fields (make-vector 14 nil))
 285           (while (< i 14)
 286             (aset xlfd-fields i (match-string (1+ i) pattern))
 287             (setq i (1+ i)))
 288           xlfd-fields)
 289       (setq fontname (condition-case nil
 290                          (x-resolve-font-name pattern)
 291                        (error)))
 292       (if (and fontname
 293                (string-match xlfd-tight-regexp fontname))
 294           ;; We get a full XLFD name.
 295           (let ((len (length pattern))
 296                 (i 0)
 297                 l)
 298             ;; Setup xlfd-fields by the full XLFD name.  Each element
 299             ;; should be a cons of matched index and matched string.
 300             (setq xlfd-fields (make-vector 14 nil))
 301             (while (< i 14)
 302               (aset xlfd-fields i
 303                     (cons (match-beginning (1+ i))
 304                           (match-string (1+ i) fontname)))
 305               (setq i (1+ i)))
 306
 307             ;; Replace wild cards in PATTERN by regexp codes.
 308             (setq i 0)
 309             (while (< i len)
 310               (let ((ch (aref pattern i)))
 311                 (if (= ch ??)
 312                     (setq pattern (concat (substring pattern 0 i)
 313                                           "\\(.\\)"
 314                                           (substring pattern (1+ i)))
 315                           len (+ len 4)
 316                           i (+ i 4))
 317                   (if (= ch ?*)
 318                       (setq pattern (concat (substring pattern 0 i)
 319                                             "\\(.*\\)"
 320                                             (substring pattern (1+ i)))
 321                             len (+ len 5)
 322                             i (+ i 5))
 323                     (setq i (1+ i))))))
 324
 325             ;; Set each element of xlfd-fields to proper strings.
 326             (if (string-match pattern fontname)
 327                 ;; The regular expression PATTERN matchs the full XLFD
 328                 ;; name.  Set elements that correspond to a wild card
 329                 ;; in PATTERN to "*", set the other elements to the
 330                 ;; exact strings in PATTERN.
 331                 (let ((l (cdr (cdr (match-data)))))
 332                   (setq i 0)
 333                   (while (< i 14)
 334                     (if (or (null l) (< (car (aref xlfd-fields i)) (car l)))
 335                         (progn
 336                           (aset xlfd-fields i (cdr (aref xlfd-fields i)))
 337                           (setq i (1+ i)))
 338                       (if (< (car (aref xlfd-fields i)) (car (cdr l)))
 339                           (progn
 340                             (aset xlfd-fields i "*")
 341                             (setq i (1+ i)))
 342                         (setq l (cdr (cdr l)))))))
 343               ;; Set each element of xlfd-fields to the exact string
 344               ;; in the corresonding fields in full XLFD name.
 345               (setq i 0)
 346               (while (< i 14)
 347                 (aset xlfd-fields i (cdr (aref xlfd-fields i)))
 348                 (setq i (1+ i))))
 349             xlfd-fields)))))
 350
 351 ;; Replace consecutive wild-cards (`*') in NAME to one.
 352 ;; Ex. (x-reduce-font-name "-*-*-*-iso8859-1") => "-*-iso8859-1"
 353 (defsubst x-reduce-font-name (name)
 354   (while (string-match "-\\*-\\(\\*-\\)+" name)
 355     (setq name (replace-match "-*-" t t name)))
 356   name)
 357
 358 (defun x-compose-font-name (fields &optional reduce)
 359   "Compose X's fontname from FIELDS.
 360 FIELDS is a vector of XLFD fields, the length 14.
 361 If a field is nil, wild-card letter `*' is embedded.
 362 Optional argument REDUCE is always ignored.  It exists just for
 363 backward compatibility."
 364   (concat "-" (mapconcat (lambda (x) (or x "*")) fields "-")))
 365
 366
 367 (defun x-must-resolve-font-name (xlfd-fields)
 368   "Like `x-resolve-font-name', but always return a font name.
 369 XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
 370 If no font matching XLFD-FIELDS is available, successively replace
 371 parts of the font name pattern with \"*\" until some font is found.
 372 Value is name of that font."
 373   (let ((ascii-font nil) (index 0))
 374     (while (and (null ascii-font) (<= index xlfd-regexp-encoding-subnum))
 375       (let ((pattern (x-compose-font-name xlfd-fields)))
 376         (condition-case nil
 377             (setq ascii-font (x-resolve-font-name pattern))
 378           (error
 379            (message "Warning: no fonts matching `%s' available" pattern)
 380            (aset xlfd-fields index "*")
 381            (setq index (1+ index))))))
 382     (unless ascii-font
 383       (error "No fonts founds"))
 384     ascii-font))
 385
 386
 387 (defun x-complement-fontset-spec (xlfd-fields fontlist)
 388   "Complement FONTLIST for charsets based on XLFD-FIELDS and return it.
 389 XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
 390 FONTLIST is an alist of charsets vs the corresponding font names.
 391
 392 The fonts are complemented as below.
 393
 394 If FONTLIST doesn't specify a font for ASCII charset, generate a font
 395 name for the charset from XLFD-FIELDS, and add that information to
 396 FONTLIST.
 397
 398 If a font specifid for ASCII supports the other charsets (see the
 399 variable `x-font-name-charset-alist'), add that information to FONTLIST."
 400   (let* ((slot (assq 'ascii fontlist))
 401          (ascii-font (cdr slot))
 402          ascii-font-spec)
 403     (if ascii-font
 404         (setcdr slot (setq ascii-font (x-resolve-font-name ascii-font)))
 405       ;; If font for ASCII is not specified, add it.
 406       (aset xlfd-fields xlfd-regexp-registry-subnum "iso8859")
 407       (aset xlfd-fields xlfd-regexp-encoding-subnum "1")
 408       (setq ascii-font (x-must-resolve-font-name xlfd-fields))
 409       (setq fontlist (cons (cons 'ascii ascii-font) fontlist)))
 410
 411     ;; If the font for ASCII also supports the other charsets, and
 412     ;; they are not specified in FONTLIST, add them.
 413     (setq xlfd-fields (x-decompose-font-name ascii-font))
 414     (if (not xlfd-fields)
 415         (setq ascii-font-spec ascii-font)
 416       (setq ascii-font-spec
 417             (cons (format "%s-%s"
 418                           (aref xlfd-fields xlfd-regexp-foundry-subnum)
 419                           (aref xlfd-fields xlfd-regexp-family-subnum))
 420                   (format "%s-%s"
 421                           (aref xlfd-fields xlfd-regexp-registry-subnum)
 422                           (aref xlfd-fields xlfd-regexp-encoding-subnum)))))
 423     (let ((tail x-font-name-charset-alist)
 424           elt)
 425       (while tail
 426         (setq elt (car tail) tail (cdr tail))
 427         (if (string-match (car elt) ascii-font)
 428             (let ((charsets (cdr elt))
 429                   charset)
 430               (while charsets
 431                 (setq charset (car charsets) charsets (cdr charsets))
 432                 (or (assq charset fontlist)
 433                     (setq fontlist
 434                           (cons (cons charset ascii-font-spec) fontlist))))))))
 435
 436     fontlist))
 437
 438 (defun fontset-name-p (fontset)
 439   "Return non-nil if FONTSET is valid as fontset name.
 440 A valid fontset name should conform to XLFD (X Logical Font Description)
 441 with \"fontset\" in `<CHARSET_REGISTRY> field."
 442   (and (string-match xlfd-tight-regexp fontset)
 443        (string= (match-string (1+ xlfd-regexp-registry-subnum) fontset)
 444                 "fontset")))
 445
 446 ;; Return a list to be appended to `x-fixed-font-alist' when
 447 ;; `mouse-set-font' is called.
 448 (defun generate-fontset-menu ()
 449   (let ((fontsets (fontset-list))
 450         fontset-name
 451         l)
 452     (while fontsets
 453       (setq fontset-name (car fontsets) fontsets (cdr fontsets))
 454       (setq l (cons (list (fontset-plain-name fontset-name) fontset-name) l)))
 455     (cons "Fontset"
 456           (sort l (function (lambda (x y) (string< (car x) (car y))))))))
 457
 458 (defun fontset-plain-name (fontset)
 459   "Return a plain and descriptive name of FONTSET."
 460   (if (not (setq fontset (query-fontset fontset)))
 461       (error "Invalid fontset: %s" fontset))
 462   (let ((xlfd-fields (x-decompose-font-name fontset)))
 463     (if xlfd-fields
 464         (let ((weight (aref xlfd-fields xlfd-regexp-weight-subnum))
 465               (slant  (aref xlfd-fields xlfd-regexp-slant-subnum))
 466               (swidth (aref xlfd-fields xlfd-regexp-swidth-subnum))
 467               (size   (aref xlfd-fields xlfd-regexp-pixelsize-subnum))
 468               (charset (aref xlfd-fields xlfd-regexp-registry-subnum))
 469               (nickname (aref xlfd-fields xlfd-regexp-encoding-subnum))
 470               name)
 471           (if (not (string= "fontset" charset))
 472               fontset
 473             (if (> (string-to-int size) 0)
 474                 (setq name (format "%s: %s-dot" nickname size))
 475               (setq name nickname))
 476             (cond ((string-match "^medium$" weight)
 477                    (setq name (concat name " " "medium")))
 478                   ((string-match "^bold$\\|^demibold$" weight)
 479                    (setq name (concat name " " weight))))
 480             (cond ((string-match "^i$" slant)
 481                    (setq name (concat name " " "italic")))
 482                   ((string-match "^o$" slant)
 483                    (setq name (concat name " " "slant")))
 484                   ((string-match "^ri$" slant)
 485                    (setq name (concat name " " "reverse italic")))
 486                   ((string-match "^ro$" slant)
 487                    (setq name (concat name " " "reverse slant"))))
 488             name))
 489       fontset)))
 490
 491
 492 (defun create-fontset-from-fontset-spec (fontset-spec
 493                                          &optional style-variant noerror)
 494   "Create a fontset from fontset specification string FONTSET-SPEC.
 495 FONTSET-SPEC is a string of the format:
 496         FONTSET-NAME,CHARSET-NAME0:FONT-NAME0,CHARSET-NAME1:FONT-NAME1, ...
 497 Any number of SPACE, TAB, and NEWLINE can be put before and after commas.
 498
 499 Optional 2nd argument is ignored.  It exists just for backward
 500 compatibility.
 501
 502 If this function attempts to create already existing fontset, error is
 503 signaled unless the optional 3rd argument NOERROR is non-nil.
 504
 505 It returns a name of the created fontset."
 506   (if (not (string-match "^[^,]+" fontset-spec))
 507       (error "Invalid fontset spec: %s" fontset-spec))
 508   (setq fontset-spec (downcase fontset-spec))
 509   (let ((idx (match-end 0))
 510         (name (match-string 0 fontset-spec))
 511         xlfd-fields charset fontlist ascii-font)
 512     (if (query-fontset name)
 513         (or noerror
 514             (error "Fontset \"%s\" already exists" name))
 515       (setq xlfd-fields (x-decompose-font-name name))
 516       (or xlfd-fields
 517           (error "Fontset \"%s\" not conforming to XLFD" name))
 518
 519       ;; At first, extract pairs of charset and fontname from FONTSET-SPEC.
 520       (while (string-match "[, \t\n]*\\([^:]+\\):\\([^,]+\\)" fontset-spec idx)
 521         (setq idx (match-end 0))
 522         (setq charset (intern (match-string 1 fontset-spec)))
 523         (if (charsetp charset)
 524             (setq fontlist (cons (cons charset (match-string 2 fontset-spec))
 525                                  fontlist))))
 526       (setq ascii-font (cdr (assq 'ascii fontlist)))
 527
 528       ;; Complement FONTLIST.
 529       (setq fontlist (x-complement-fontset-spec xlfd-fields fontlist))
 530
 531       (new-fontset name fontlist)
 532
 533       ;; Define the short name alias.
 534       (if (and (string-match "fontset-.*$" name)
 535                (not (assoc name fontset-alias-alist)))
 536           (let ((alias (match-string 0 name)))
 537             (or (rassoc alias fontset-alias-alist)
 538                 (setq fontset-alias-alist
 539                       (cons (cons name alias) fontset-alias-alist)))))
 540
 541       ;; Define the ASCII font name alias.
 542       (or ascii-font
 543           (setq ascii-font (cdr (assq 'ascii fontlist))))
 544       (or (rassoc ascii-font fontset-alias-alist)
 545           (setq fontset-alias-alist
 546                 (cons (cons name ascii-font)
 547                       fontset-alias-alist))))
 548
 549     name))
 550
 551 (defun create-fontset-from-ascii-font (font &optional resolved-font
 552                                             fontset-name)
 553   "Create a fontset from an ASCII font FONT.
 554
 555 Optional 1st arg RESOLVED-FONT is a resolved name of FONT.  If
 556 omitted, x-resolve-font-name is called to get the resolved name.  At
 557 this time, if FONT is not available, error is signaled.
 558
 559 Optional 2nd arg FONTSET-NAME is a string to be used in
 560 `<CHARSET_ENCODING>' fields of a new fontset name.  If it is omitted,
 561 an appropriate name is generated automatically.
 562
 563 It returns a name of the created fontset."
 564   (setq font (downcase font))
 565   (if resolved-font
 566       (setq resolved-font (downcase resolved-font))
 567     (setq resolved-font (downcase (x-resolve-font-name font))))
 568   (let ((xlfd (x-decompose-font-name font))
 569         (resolved-xlfd (x-decompose-font-name resolved-font))
 570         fontset fontset-spec)
 571     (aset xlfd xlfd-regexp-foundry-subnum nil)
 572     (aset xlfd xlfd-regexp-family-subnum nil)
 573     (aset xlfd xlfd-regexp-registry-subnum "fontset")
 574     (if fontset-name
 575         (setq fontset-name (downcase fontset-name))
 576       (setq fontset-name
 577             (format "%s_%s_%s"
 578                     (aref resolved-xlfd xlfd-regexp-registry-subnum)
 579                     (aref resolved-xlfd xlfd-regexp-encoding-subnum)
 580                     (aref resolved-xlfd xlfd-regexp-pixelsize-subnum))))
 581     (aset xlfd xlfd-regexp-encoding-subnum fontset-name)
 582     (setq fontset (x-compose-font-name xlfd))
 583     (or (query-fontset fontset)
 584         (create-fontset-from-fontset-spec (concat fontset ", ascii:" font)))))
 585
 586 \f
 587 ;; Create standard fontset from 16 dots fonts which are the most widely
 588 ;; installed fonts.  Fonts for Chinese-GB, Korean, and Chinese-CNS are
 589 ;; specified here because FAMILY of those fonts are not "fixed" in
 590 ;; many cases.
 591 (defvar standard-fontset-spec
 592   (purecopy "-*-fixed-medium-r-normal-*-16-*-*-*-*-*-fontset-standard,
 593         chinese-gb2312:-*-medium-r-normal-*-16-*-gb2312*-*,
 594         korean-ksc5601:-*-medium-r-normal-*-16-*-ksc5601*-*,
 595         chinese-cns11643-1:-*-medium-r-normal-*-16-*-cns11643*-1,
 596         chinese-cns11643-2:-*-medium-r-normal-*-16-*-cns11643*-2,
 597         chinese-cns11643-3:-*-medium-r-normal-*-16-*-cns11643*-3,
 598         chinese-cns11643-4:-*-medium-r-normal-*-16-*-cns11643*-4,
 599         chinese-cns11643-5:-*-medium-r-normal-*-16-*-cns11643*-5,
 600         chinese-cns11643-6:-*-medium-r-normal-*-16-*-cns11643*-6,
 601         chinese-cns11643-7:-*-medium-r-normal-*-16-*-cns11643*-7")
 602   "String of fontset spec of the standard fontset.
 603 You have the biggest chance to display international characters
 604 with correct glyphs by using the standard fontset.
 605 See the documentation of `create-fontset-from-fontset-spec' for the format.")
 606
 607 ;; Create fontsets from X resources of the name `fontset-N (class
 608 ;; Fontset-N)' where N is integer 0, 1, ...
 609 ;; The values of the resources the string of the same format as
 610 ;; `standard-fontset-spec'.
 611
 612 (defun create-fontset-from-x-resource ()
 613   (let ((idx 0)
 614         fontset-spec)
 615     (while (setq fontset-spec (x-get-resource (format "fontset-%d" idx)
 616                                               (format "Fontset-%d" idx)))
 617       (create-fontset-from-fontset-spec fontset-spec t 'noerror)
 618       (setq idx (1+ idx)))))
 619
 620 ;;
 621 (provide 'fontset)
 622
 623 ;;; fontset.el ends here