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