lisp/international/fontset.el

   1 ;;; fontset.el --- commands for handling fontset
   2
   3 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001  Free Software Foundation, Inc.
   4 ;; Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   5 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   6 ;;   Registration Number H14PRO021
   7
   8 ;; Keywords: mule, multilingual, fontset
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 ;; Set standard fontname specification of characters in the default
  32 ;; fontset to find an appropriate font for each charset.  This is used
  33 ;; to generate a font name for a fontset if the fontset doesn't
  34 ;; specify a font name for a specific character.  The specification
  35 ;; has the form (FAMILY . REGISTRY).  FAMILY may be nil, in which
  36 ;; case, the family name of default face is used.  If REGISTRY
  37 ;; contains a character `-', the string before that is embedded in
  38 ;; `CHARSET_REGISTRY' field, and the string after that is embedded in
  39 ;; `CHARSET_ENCODING' field.  If it does not contain `-', the whole
  40 ;; string is embedded in `CHARSET_REGISTRY' field, and a wild card
  41 ;; character `*' is embedded in `CHARSET_ENCODING' field.  The
  42 ;; REGISTRY for ASCII characters are predefined as "ISO8859-1".
  43
  44 (defun setup-default-fontset ()
  45   "Setup the default fontset."
  46   (dolist (elt
  47            `((latin-iso8859-1 . (nil . "ISO8859-1"))
  48              (latin-iso8859-2 . (nil . "ISO8859-2"))
  49              (latin-iso8859-3 . (nil . "ISO8859-3"))
  50              (latin-iso8859-4 . (nil . "ISO8859-4"))
  51              ;; Setting "*" family is for a workaround of the problem
  52              ;; that a font of wrong size is preferred if the font
  53              ;; family matches with a requested one.
  54              (thai-tis620 . ("*" . "TIS620"))
  55              (greek-iso8859-7 . (nil . "ISO8859-7"))
  56              (arabic-iso8859-6 . (nil . "ISO8859-6"))
  57              (hebrew-iso8859-8 . (nil . "ISO8859-8"))
  58              (katakana-jisx0201 . (nil . "JISX0201"))
  59              (latin-jisx0201 . (nil . "JISX0201"))
  60              (cyrillic-iso8859-5 . (nil . "ISO8859-5"))
  61              (latin-iso8859-9 . (nil . "ISO8859-9"))
  62              (japanese-jisx0208-1978 . (nil . "JISX0208.1978"))
  63              (chinese-gb2312 . (nil . "GB2312.1980"))
  64              (japanese-jisx0208 . (nil . "JISX0208.1990"))
  65              (korean-ksc5601 . (nil . "KSC5601.1989"))
  66              (japanese-jisx0212 . (nil . "JISX0212"))
  67              (chinese-cns11643-1 . (nil . "CNS11643.1992-1"))
  68              (chinese-cns11643-2 . (nil . "CNS11643.1992-2"))
  69              (chinese-cns11643-3 . (nil . "CNS11643.1992-3"))
  70              (chinese-cns11643-4 . (nil . "CNS11643.1992-4"))
  71              (chinese-cns11643-5 . (nil . "CNS11643.1992-5"))
  72              (chinese-cns11643-6 . (nil . "CNS11643.1992-6"))
  73              (chinese-cns11643-7 . (nil . "CNS11643.1992-7"))
  74              (chinese-big5-1 . (nil . "Big5"))
  75              (chinese-big5-2 . (nil . "Big5"))
  76              (chinese-sisheng . (nil . "sisheng_cwnn"))
  77              (vietnamese-viscii-lower . (nil . "VISCII1.1"))
  78              (vietnamese-viscii-upper . (nil . "VISCII1.1"))
  79              (arabic-digit . (nil . "MuleArabic-0"))
  80              (arabic-1-column . (nil . "MuleArabic-1"))
  81              (arabic-2-column . (nil . "MuleArabic-2"))
  82              (ipa . (nil . "MuleIPA"))
  83              (ethiopic . (nil . "Ethiopic-Unicode"))
  84              (ascii-right-to-left . (nil . "ISO8859-1"))
  85              (indian-is13194 . (nil . "IS13194-Devanagari"))
  86              (indian-2-column . (nil . "MuleIndian-2"))
  87              (lao . (nil . "MuleLao-1"))
  88              (tibetan . ("proportional" . "MuleTibetan-2"))
  89              (tibetan-1-column . (nil . "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 . (nil . "JISX0213.2000-1"))
  96              (japanese-jisx0213-2 . (nil . "JISX0213.2000-2"))
  97              ;; unicode
  98              ((,(decode-char 'ucs #x0900) . ,(decode-char 'ucs #x097F))
  99               . (nil . "ISO10646.indian-1"))
 100              ;; Indian CDAC
 101              (,(indian-font-char-range 'cdac:dv-ttsurekh)
 102               . (nil . "Devanagari-CDAC"))
 103              (,(indian-font-char-range 'cdac:sd-ttsurekh)
 104               . (nil . "Sanskrit-CDAC"))
 105              (,(indian-font-char-range 'cdac:bn-ttdurga)
 106               . (nil . "Bengali-CDAC"))
 107              (,(indian-font-char-range 'cdac:as-ttdurga)
 108               . (nil . "Assamese-CDAC"))
 109              (,(indian-font-char-range 'cdac:pn-ttamar)
 110               . (nil . "Punjabi-CDAC"))
 111              (,(indian-font-char-range 'cdac:gj-ttavantika)
 112               . (nil . "Gujarati-CDAC"))
 113              (,(indian-font-char-range 'cdac:or-ttsarala)
 114               . (nil . "Oriya-CDAC"))
 115              (,(indian-font-char-range 'cdac:tm-ttvalluvar)
 116               . (nil . "Tamil-CDAC"))
 117              (,(indian-font-char-range 'cdac:tl-tthemalatha)
 118               . (nil . "Telugu-CDAC"))
 119              (,(indian-font-char-range 'cdac:kn-ttuma)
 120               . (nil . "Kannada-CDAC"))
 121              (,(indian-font-char-range 'cdac:ml-ttkarthika)
 122               . (nil . "Malayalam-CDAC"))
 123              ;; Indian AKRUTI
 124              (,(indian-font-char-range 'akruti:dev)
 125               . (nil . "Devanagari-Akruti"))
 126              (,(indian-font-char-range 'akruti:bng)
 127               . (nil . "Bengali-Akruti"))
 128              (,(indian-font-char-range 'akruti:pnj)
 129               . (nil . "Punjabi-Akruti"))
 130              (,(indian-font-char-range 'akruti:guj)
 131               . (nil . "Gujarati-Akruti"))
 132              (,(indian-font-char-range 'akruti:ori)
 133               . (nil . "Oriay-Akruti"))
 134              (,(indian-font-char-range 'akruti:tml)
 135               . (nil . "Tamil-Akruti"))
 136              (,(indian-font-char-range 'akruti:tlg)
 137               . (nil . "Telugu-Akruti"))
 138              (,(indian-font-char-range 'akruti:knd)
 139               . (nil . "Kannada-Akruti"))
 140              (,(indian-font-char-range 'akruti:mal)
 141               . (nil . "Malayalam-Akruti"))
 142              ))
 143     (set-fontset-font "fontset-default" (car elt) (cdr elt))))
 144
 145 ;; Set arguments in `font-encoding-alist' (which see).
 146 (defun set-font-encoding (pattern charset encoding)
 147   (let ((slot (assoc pattern font-encoding-alist)))
 148     (if slot
 149         (let ((place (assq charset (cdr slot))))
 150           (if place
 151               (setcdr place encoding)
 152             (setcdr slot (cons (cons charset encoding) (cdr slot)))))
 153       (setq font-encoding-alist
 154             (cons (list pattern (cons charset encoding)) font-encoding-alist)))
 155     ))
 156
 157 ;; Allow display of arbitrary characters with an iso-10646-encoded
 158 ;; (`Unicode') font.
 159 (define-translation-table 'ucs-mule-to-mule-unicode
 160   ucs-mule-to-mule-unicode)
 161 (define-translation-hash-table 'ucs-mule-cjk-to-unicode
 162   ucs-mule-cjk-to-unicode)
 163
 164 (define-ccl-program ccl-encode-unicode-font
 165   `(0
 166     ;; r0: charset-id
 167     ;; r1: 1st position code
 168     ;; r2: 2nd position code (if r0 is 2D charset)
 169     ((if (r0 == ,(charset-id 'ascii))
 170          ((r2 = r1)
 171           (r1 = 0))
 172        ;; At first, try to get a Unicode code point directly.
 173        ((if (r2 >= 0)
 174             ;; This is a 2D charset.
 175             (r1 = ((r1 << 7) | r2)))
 176         (lookup-character ucs-mule-cjk-to-unicode r0 r1)
 177         (if r7
 178             ;; We got it!
 179             ((r1 = (r0 >> 8))
 180              (r2 = (r0 & #xFF)))
 181           ;; Look for a translation for non-ASCII chars.
 182           ((translate-character ucs-mule-to-mule-unicode r0 r1)
 183            (if (r0 == ,(charset-id 'latin-iso8859-1))
 184                ((r2 = (r1 + 128))
 185                 (r1 = 0))
 186              ((r2 = (r1 & #x7F))
 187               (r1 >>= 7)
 188               (if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
 189                   ((r1 *= 96)
 190                    (r1 += r2)
 191                    (r1 += ,(- #x100 (* 32 96) 32))
 192                    (r1 >8= 0)
 193                    (r2 = r7))
 194                 (if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
 195                     ((r1 *= 96)
 196                      (r1 += r2)
 197                      (r1 += ,(- #x2500 (* 32 96) 32))
 198                      (r1 >8= 0)
 199                      (r2 = r7))
 200                   (if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
 201                       ((r1 *= 96)
 202                        (r1 += r2)
 203                        (r1 += ,(- #xe000 (* 32 96) 32))
 204                        (r1 >8= 0)
 205                        (r2 = r7))
 206                     ;; No way, use the glyph for U+FFFD.
 207                     ((r1 = #xFF)
 208                      (r2 = #xFD)))))))))))))
 209   "Encode characters for display with iso10646 font.
 210 Translate through the translation-hash-table named
 211 `ucs-mule-cjk-to-unicode' and the translation-table named
 212 `ucs-mule-to-mule-unicode' initially.")
 213
 214 ;; Use the above CCL encoder for Unicode fonts.  Please note that the
 215 ;; regexp is not simply "ISO10646-1" because there exists, for
 216 ;; instance, the following Devanagari Unicode fonts:
 217 ;;      -misc-fixed-medium-r-normal--24-240-72-72-c-120-iso10646.indian-1
 218 ;;      -sibal-devanagari-medium-r-normal--24-240-75-75-P--iso10646-dev
 219 (setq font-ccl-encoder-alist
 220       (cons '("ISO10646.*-*" . ccl-encode-unicode-font)
 221             font-ccl-encoder-alist))
 222
 223 ;; Setting for suppressing XLoadQueryFont on big fonts.
 224 (setq x-pixel-size-width-font-regexp
 225       "gb2312\\|jisx0208\\|ksc5601\\|cns11643\\|big5")
 226
 227 ;; These fonts require vertical centering.
 228 (setq vertical-centering-font-regexp
 229       "gb2312\\|jisx0208\\|jisx0212\\|ksc5601\\|cns11643\\|big5")
 230
 231 ;; CDAC fonts are actually smaller than their design sizes.
 232 (setq face-font-rescale-alist
 233       '(("-cdac$" . 1.3)))
 234
 235 (defvar x-font-name-charset-alist
 236   '(("iso8859-1" ascii latin-iso8859-1)
 237     ("iso8859-2" ascii latin-iso8859-2)
 238     ("iso8859-3" ascii latin-iso8859-3)
 239     ("iso8859-4" ascii latin-iso8859-4)
 240     ("iso8859-5" ascii cyrillic-iso8859-5)
 241     ("iso8859-6" ascii arabic-iso8859-6)
 242     ("iso8859-7" ascii greek-iso8859-7)
 243     ("iso8859-8" ascii hebrew-iso8859-8)
 244     ("iso8859-14" ascii latin-iso8859-14)
 245     ("iso8859-15" ascii latin-iso8859-15)
 246     ("tis620" ascii thai-tis620)
 247     ("koi8" ascii cyrillic-iso8859-5)
 248     ("viscii" ascii vietnamese-viscii-upper vietnamese-viscii-lower)
 249     ("vscii" ascii vietnamese-viscii-upper vietnamese-viscii-lower)
 250     ("mulelao-1" ascii lao)
 251     ("iso10646-1" ascii latin-iso8859-1 mule-unicode-0100-24ff
 252      mule-unicode-2500-33ff mule-unicode-e000-ffff))
 253   "Alist of font names vs list of charsets the font can display.
 254
 255 When a font name which matches some element of this alist is given as
 256 `-fn' command line argument or is specified by X resource, a fontset
 257 which uses the specified font for the corresponding charsets are
 258 created and used for the initial frame.")
 259
 260 ;;; XLFD (X Logical Font Description) format handler.
 261
 262 ;; Define XLFD's field index numbers.           ; field name
 263 (defconst xlfd-regexp-foundry-subnum 0)         ; FOUNDRY
 264 (defconst xlfd-regexp-family-subnum 1)          ; FAMILY_NAME
 265 (defconst xlfd-regexp-weight-subnum 2)          ; WEIGHT_NAME
 266 (defconst xlfd-regexp-slant-subnum 3)           ; SLANT
 267 (defconst xlfd-regexp-swidth-subnum 4)          ; SETWIDTH_NAME
 268 (defconst xlfd-regexp-adstyle-subnum 5)         ; ADD_STYLE_NAME
 269 (defconst xlfd-regexp-pixelsize-subnum 6)       ; PIXEL_SIZE
 270 (defconst xlfd-regexp-pointsize-subnum 7)       ; POINT_SIZE
 271 (defconst xlfd-regexp-resx-subnum 8)            ; RESOLUTION_X
 272 (defconst xlfd-regexp-resy-subnum 9)            ; RESOLUTION_Y
 273 (defconst xlfd-regexp-spacing-subnum 10)        ; SPACING
 274 (defconst xlfd-regexp-avgwidth-subnum 11)       ; AVERAGE_WIDTH
 275 (defconst xlfd-regexp-registry-subnum 12)       ; CHARSET_REGISTRY
 276 (defconst xlfd-regexp-encoding-subnum 13)       ; CHARSET_ENCODING
 277
 278 ;; Regular expression matching against a fontname which conforms to
 279 ;; XLFD (X Logical Font Description).  All fields in XLFD should be
 280 ;; not be omitted (but can be a wild card) to be matched.
 281 (defconst xlfd-tight-regexp
 282   "^\
 283 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
 284 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
 285 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)$")
 286
 287 ;; List of field numbers of XLFD whose values are numeric.
 288 (defconst xlfd-regexp-numeric-subnums
 289   (list xlfd-regexp-pixelsize-subnum    ;6
 290         xlfd-regexp-pointsize-subnum    ;7
 291         xlfd-regexp-resx-subnum         ;8
 292         xlfd-regexp-resy-subnum         ;9
 293         xlfd-regexp-avgwidth-subnum     ;11
 294         ))
 295
 296 (defun x-decompose-font-name (pattern)
 297   "Decompose PATTERN into XLFD's fields and return vector of the fields.
 298 The length of the vector is 14.
 299
 300 If PATTERN doesn't conform to XLFD, try to get a full XLFD name from
 301 X server and use the information of the full name to decompose
 302 PATTERN.  If no full XLFD name is gotten, return nil."
 303   (let (xlfd-fields fontname)
 304     (if (string-match xlfd-tight-regexp pattern)
 305         (let ((i 0))
 306           (setq xlfd-fields (make-vector 14 nil))
 307           (while (< i 14)
 308             (aset xlfd-fields i (match-string (1+ i) pattern))
 309             (setq i (1+ i)))
 310           xlfd-fields)
 311       (setq fontname (condition-case nil
 312                          (x-resolve-font-name pattern)
 313                        (error)))
 314       (if (and fontname
 315                (string-match xlfd-tight-regexp fontname))
 316           ;; We get a full XLFD name.
 317           (let ((len (length pattern))
 318                 (i 0)
 319                 l)
 320             ;; Setup xlfd-fields by the full XLFD name.  Each element
 321             ;; should be a cons of matched index and matched string.
 322             (setq xlfd-fields (make-vector 14 nil))
 323             (while (< i 14)
 324               (aset xlfd-fields i
 325                     (cons (match-beginning (1+ i))
 326                           (match-string (1+ i) fontname)))
 327               (setq i (1+ i)))
 328
 329             ;; Replace wild cards in PATTERN by regexp codes.
 330             (setq i 0)
 331             (while (< i len)
 332               (let ((ch (aref pattern i)))
 333                 (if (= ch ??)
 334                     (setq pattern (concat (substring pattern 0 i)
 335                                           "\\(.\\)"
 336                                           (substring pattern (1+ i)))
 337                           len (+ len 4)
 338                           i (+ i 4))
 339                   (if (= ch ?*)
 340                       (setq pattern (concat (substring pattern 0 i)
 341                                             "\\(.*\\)"
 342                                             (substring pattern (1+ i)))
 343                             len (+ len 5)
 344                             i (+ i 5))
 345                     (setq i (1+ i))))))
 346
 347             ;; Set each element of xlfd-fields to proper strings.
 348             (if (string-match pattern fontname)
 349                 ;; The regular expression PATTERN matchs the full XLFD
 350                 ;; name.  Set elements that correspond to a wild card
 351                 ;; in PATTERN to "*", set the other elements to the
 352                 ;; exact strings in PATTERN.
 353                 (let ((l (cdr (cdr (match-data)))))
 354                   (setq i 0)
 355                   (while (< i 14)
 356                     (if (or (null l) (< (car (aref xlfd-fields i)) (car l)))
 357                         (progn
 358                           (aset xlfd-fields i (cdr (aref xlfd-fields i)))
 359                           (setq i (1+ i)))
 360                       (if (< (car (aref xlfd-fields i)) (car (cdr l)))
 361                           (progn
 362                             (aset xlfd-fields i "*")
 363                             (setq i (1+ i)))
 364                         (setq l (cdr (cdr l)))))))
 365               ;; Set each element of xlfd-fields to the exact string
 366               ;; in the corresonding fields in full XLFD name.
 367               (setq i 0)
 368               (while (< i 14)
 369                 (aset xlfd-fields i (cdr (aref xlfd-fields i)))
 370                 (setq i (1+ i))))
 371             xlfd-fields)))))
 372
 373 ;; Replace consecutive wild-cards (`*') in NAME to one.
 374 ;; Ex. (x-reduce-font-name "-*-*-*-iso8859-1") => "-*-iso8859-1"
 375 (defsubst x-reduce-font-name (name)
 376   (while (string-match "-\\*-\\(\\*-\\)+" name)
 377     (setq name (replace-match "-*-" t t name)))
 378   name)
 379
 380 (defun x-compose-font-name (fields &optional reduce)
 381   "Compose X's fontname from FIELDS.
 382 FIELDS is a vector of XLFD fields, the length 14.
 383 If a field is nil, wild-card letter `*' is embedded.
 384 Optional argument REDUCE is always ignored.  It exists just for
 385 backward compatibility."
 386   (concat "-" (mapconcat (lambda (x) (or x "*")) fields "-")))
 387
 388
 389 (defun x-must-resolve-font-name (xlfd-fields)
 390   "Like `x-resolve-font-name', but always return a font name.
 391 XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
 392 If no font matching XLFD-FIELDS is available, successively replace
 393 parts of the font name pattern with \"*\" until some font is found.
 394 Value is name of that font."
 395   (let ((ascii-font nil) (index 0))
 396     (while (and (null ascii-font) (<= index xlfd-regexp-encoding-subnum))
 397       (let ((pattern (x-compose-font-name xlfd-fields)))
 398         (condition-case nil
 399             (setq ascii-font (x-resolve-font-name pattern))
 400           (error
 401            (message "Warning: no fonts matching `%s' available" pattern)
 402            (aset xlfd-fields index "*")
 403            (setq index (1+ index))))))
 404     (unless ascii-font
 405       (error "No fonts found"))
 406     ascii-font))
 407
 408
 409 (defun x-complement-fontset-spec (xlfd-fields fontlist)
 410   "Complement FONTLIST for charsets based on XLFD-FIELDS and return it.
 411 XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
 412 FONTLIST is an alist of charsets vs the corresponding font names.
 413
 414 The fonts are complemented as below.
 415
 416 If FONTLIST doesn't specify a font for ASCII charset, generate a font
 417 name for the charset from XLFD-FIELDS, and add that information to
 418 FONTLIST.
 419
 420 If a font specifid for ASCII supports the other charsets (see the
 421 variable `x-font-name-charset-alist'), add that information to FONTLIST."
 422   (let* ((slot (assq 'ascii fontlist))
 423          (ascii-font (cdr slot))
 424          ascii-font-spec)
 425     (if ascii-font
 426         (setcdr slot (setq ascii-font (x-resolve-font-name ascii-font)))
 427       ;; If font for ASCII is not specified, add it.
 428       (aset xlfd-fields xlfd-regexp-registry-subnum "iso8859")
 429       (aset xlfd-fields xlfd-regexp-encoding-subnum "1")
 430       (setq ascii-font (x-must-resolve-font-name xlfd-fields))
 431       (setq fontlist (cons (cons 'ascii ascii-font) fontlist)))
 432
 433     ;; If the font for ASCII also supports the other charsets, and
 434     ;; they are not specified in FONTLIST, add them.
 435     (setq xlfd-fields (x-decompose-font-name ascii-font))
 436     (if (not xlfd-fields)
 437         (setq ascii-font-spec ascii-font)
 438       (setq ascii-font-spec
 439             (cons (format "%s-%s"
 440                           (aref xlfd-fields xlfd-regexp-foundry-subnum)
 441                           (aref xlfd-fields xlfd-regexp-family-subnum))
 442                   (format "%s-%s"
 443                           (aref xlfd-fields xlfd-regexp-registry-subnum)
 444                           (aref xlfd-fields xlfd-regexp-encoding-subnum)))))
 445     (let ((tail x-font-name-charset-alist)
 446           elt)
 447       (while tail
 448         (setq elt (car tail) tail (cdr tail))
 449         (if (string-match (car elt) ascii-font)
 450             (let ((charsets (cdr elt))
 451                   charset)
 452               (while charsets
 453                 (setq charset (car charsets) charsets (cdr charsets))
 454                 (or (assq charset fontlist)
 455                     (setq fontlist
 456                           (cons (cons charset ascii-font-spec) fontlist))))))))
 457
 458     fontlist))
 459
 460 (defun fontset-name-p (fontset)
 461   "Return non-nil if FONTSET is valid as fontset name.
 462 A valid fontset name should conform to XLFD (X Logical Font Description)
 463 with \"fontset\" in `<CHARSET_REGISTRY> field."
 464   (and (string-match xlfd-tight-regexp fontset)
 465        (string= (match-string (1+ xlfd-regexp-registry-subnum) fontset)
 466                 "fontset")))
 467
 468 ;; Return a list to be appended to `x-fixed-font-alist' when
 469 ;; `mouse-set-font' is called.
 470 (defun generate-fontset-menu ()
 471   (let ((fontsets (fontset-list))
 472         fontset-name
 473         l)
 474     (while fontsets
 475       (setq fontset-name (car fontsets) fontsets (cdr fontsets))
 476       (setq l (cons (list (fontset-plain-name fontset-name) fontset-name) l)))
 477     (cons "Fontset"
 478           (sort l (function (lambda (x y) (string< (car x) (car y))))))))
 479
 480 (defun fontset-plain-name (fontset)
 481   "Return a plain and descriptive name of FONTSET."
 482   (if (not (setq fontset (query-fontset fontset)))
 483       (error "Invalid fontset: %s" fontset))
 484   (let ((xlfd-fields (x-decompose-font-name fontset)))
 485     (if xlfd-fields
 486         (let ((weight (aref xlfd-fields xlfd-regexp-weight-subnum))
 487               (slant  (aref xlfd-fields xlfd-regexp-slant-subnum))
 488               (swidth (aref xlfd-fields xlfd-regexp-swidth-subnum))
 489               (size   (aref xlfd-fields xlfd-regexp-pixelsize-subnum))
 490               (charset (aref xlfd-fields xlfd-regexp-registry-subnum))
 491               (nickname (aref xlfd-fields xlfd-regexp-encoding-subnum))
 492               name)
 493           (if (not (string= "fontset" charset))
 494               fontset
 495             (if (> (string-to-number size) 0)
 496                 (setq name (format "%s: %s-dot" nickname size))
 497               (setq name nickname))
 498             (cond ((string-match "^medium$" weight)
 499                    (setq name (concat name " " "medium")))
 500                   ((string-match "^bold$\\|^demibold$" weight)
 501                    (setq name (concat name " " weight))))
 502             (cond ((string-match "^i$" slant)
 503                    (setq name (concat name " " "italic")))
 504                   ((string-match "^o$" slant)
 505                    (setq name (concat name " " "slant")))
 506                   ((string-match "^ri$" slant)
 507                    (setq name (concat name " " "reverse italic")))
 508                   ((string-match "^ro$" slant)
 509                    (setq name (concat name " " "reverse slant"))))
 510             name))
 511       fontset)))
 512
 513
 514 (defun create-fontset-from-fontset-spec (fontset-spec
 515                                          &optional style-variant noerror)
 516   "Create a fontset from fontset specification string FONTSET-SPEC.
 517 FONTSET-SPEC is a string of the format:
 518         FONTSET-NAME,CHARSET-NAME0:FONT-NAME0,CHARSET-NAME1:FONT-NAME1, ...
 519 Any number of SPACE, TAB, and NEWLINE can be put before and after commas.
 520
 521 Optional 2nd argument is ignored.  It exists just for backward
 522 compatibility.
 523
 524 If this function attempts to create already existing fontset, error is
 525 signaled unless the optional 3rd argument NOERROR is non-nil.
 526
 527 It returns a name of the created fontset."
 528   (if (not (string-match "^[^,]+" fontset-spec))
 529       (error "Invalid fontset spec: %s" fontset-spec))
 530   (setq fontset-spec (downcase fontset-spec))
 531   (let ((idx (match-end 0))
 532         (name (match-string 0 fontset-spec))
 533         xlfd-fields charset fontlist ascii-font)
 534     (if (query-fontset name)
 535         (or noerror
 536             (error "Fontset \"%s\" already exists" name))
 537       (setq xlfd-fields (x-decompose-font-name name))
 538       (or xlfd-fields
 539           (error "Fontset \"%s\" not conforming to XLFD" name))
 540
 541       ;; At first, extract pairs of charset and fontname from FONTSET-SPEC.
 542       (while (string-match "[, \t\n]*\\([^:]+\\):\\([^,]+\\)" fontset-spec idx)
 543         (setq idx (match-end 0))
 544         (setq charset (intern (match-string 1 fontset-spec)))
 545         (if (charsetp charset)
 546             (setq fontlist (cons (cons charset (match-string 2 fontset-spec))
 547                                  fontlist))))
 548       (setq ascii-font (cdr (assq 'ascii fontlist)))
 549
 550       ;; Complement FONTLIST.
 551       (setq fontlist (x-complement-fontset-spec xlfd-fields fontlist))
 552
 553       (new-fontset name fontlist)
 554
 555       ;; Define the short name alias.
 556       (if (and (string-match "fontset-.*$" name)
 557                (not (assoc name fontset-alias-alist)))
 558           (let ((alias (match-string 0 name)))
 559             (or (rassoc alias fontset-alias-alist)
 560                 (setq fontset-alias-alist
 561                       (cons (cons name alias) fontset-alias-alist)))))
 562
 563       ;; Define the ASCII font name alias.
 564       (or ascii-font
 565           (setq ascii-font (cdr (assq 'ascii fontlist))))
 566       (or (rassoc ascii-font fontset-alias-alist)
 567           (setq fontset-alias-alist
 568                 (cons (cons name ascii-font)
 569                       fontset-alias-alist))))
 570
 571     name))
 572
 573 (defun create-fontset-from-ascii-font (font &optional resolved-font
 574                                             fontset-name)
 575   "Create a fontset from an ASCII font FONT.
 576
 577 Optional 1st arg RESOLVED-FONT is a resolved name of FONT.  If
 578 omitted, `x-resolve-font-name' is called to get the resolved name.  At
 579 this time, if FONT is not available, error is signaled.
 580
 581 Optional 2nd arg FONTSET-NAME is a string to be used in
 582 `<CHARSET_ENCODING>' fields of a new fontset name.  If it is omitted,
 583 an appropriate name is generated automatically.
 584
 585 It returns a name of the created fontset."
 586   (setq font (downcase font))
 587   (if resolved-font
 588       (setq resolved-font (downcase resolved-font))
 589     (setq resolved-font (downcase (x-resolve-font-name font))))
 590   (let ((xlfd (x-decompose-font-name font))
 591         (resolved-xlfd (x-decompose-font-name resolved-font))
 592         fontset fontset-spec)
 593     (aset xlfd xlfd-regexp-foundry-subnum nil)
 594     (aset xlfd xlfd-regexp-family-subnum nil)
 595     (aset xlfd xlfd-regexp-registry-subnum "fontset")
 596     (if fontset-name
 597         (setq fontset-name (downcase fontset-name))
 598       (setq fontset-name
 599             (format "%s_%s_%s"
 600                     (aref resolved-xlfd xlfd-regexp-registry-subnum)
 601                     (aref resolved-xlfd xlfd-regexp-encoding-subnum)
 602                     (aref resolved-xlfd xlfd-regexp-pixelsize-subnum))))
 603     (aset xlfd xlfd-regexp-encoding-subnum fontset-name)
 604     (setq fontset (x-compose-font-name xlfd))
 605     (or (query-fontset fontset)
 606         (create-fontset-from-fontset-spec (concat fontset ", ascii:" font)))))
 607
 608 \f
 609 ;; Create standard fontset from 16 dots fonts which are the most widely
 610 ;; installed fonts.  Fonts for Chinese-GB, Korean, and Chinese-CNS are
 611 ;; specified here because FAMILY of those fonts are not "fixed" in
 612 ;; many cases.
 613 (defvar standard-fontset-spec
 614   (purecopy "-*-fixed-medium-r-normal-*-16-*-*-*-*-*-fontset-standard,
 615         chinese-gb2312:-*-medium-r-normal-*-16-*-gb2312*-*,
 616         korean-ksc5601:-*-medium-r-normal-*-16-*-ksc5601*-*,
 617         chinese-cns11643-1:-*-medium-r-normal-*-16-*-cns11643*-1,
 618         chinese-cns11643-2:-*-medium-r-normal-*-16-*-cns11643*-2,
 619         chinese-cns11643-3:-*-medium-r-normal-*-16-*-cns11643*-3,
 620         chinese-cns11643-4:-*-medium-r-normal-*-16-*-cns11643*-4,
 621         chinese-cns11643-5:-*-medium-r-normal-*-16-*-cns11643*-5,
 622         chinese-cns11643-6:-*-medium-r-normal-*-16-*-cns11643*-6,
 623         chinese-cns11643-7:-*-medium-r-normal-*-16-*-cns11643*-7")
 624   "String of fontset spec of the standard fontset.
 625 You have the biggest chance to display international characters
 626 with correct glyphs by using the standard fontset.
 627 See the documentation of `create-fontset-from-fontset-spec' for the format.")
 628
 629 ;; Create fontsets from X resources of the name `fontset-N (class
 630 ;; Fontset-N)' where N is integer 0, 1, ...
 631 ;; The values of the resources the string of the same format as
 632 ;; `standard-fontset-spec'.
 633
 634 (defun create-fontset-from-x-resource ()
 635   (let ((idx 0)
 636         fontset-spec)
 637     (while (setq fontset-spec (x-get-resource (format "fontset-%d" idx)
 638                                               (format "Fontset-%d" idx)))
 639       (create-fontset-from-fontset-spec fontset-spec t 'noerror)
 640       (setq idx (1+ idx)))))
 641
 642 ;;
 643 (provide 'fontset)
 644
 645 ;;; arch-tag: bb53e629-0234-403c-950e-551e61554849
 646 ;;; fontset.el ends here