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
   6 ;; Keywords: mule, multilingual, fontset
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Code:
  26
  27 ;; Set standard REGISTRY property of charset to find an appropriate
  28 ;; font for each charset.  This is used to generate a font name in a
  29 ;; fontset.  If the value contains a character `-', the string before
  30 ;; that is embeded in `CHARSET_REGISTRY' field, and the string after
  31 ;; that is embeded in `CHARSET_ENCODING' field.  If the value does not
  32 ;; contain `-', the whole string is embeded in `CHARSET_REGISTRY'
  33 ;; field, and a wild card character `*' is embeded in
  34 ;; `CHARSET_ENCODING' field.
  35
  36 (defvar x-charset-registries
  37   '((ascii . "ISO8859-1")
  38     (latin-iso8859-1 . "ISO8859-1")
  39     (latin-iso8859-2 . "ISO8859-2")
  40     (latin-iso8859-3 . "ISO8859-3")
  41     (latin-iso8859-4 . "ISO8859-4")
  42     (thai-tis620 . "TIS620")
  43     (greek-iso8859-7 . "ISO8859-7")
  44     (arabic-iso8859-6 . "ISO8859-6")
  45     (hebrew-iso8859-8 . "ISO8859-8")
  46     (katakana-jisx0201 . "JISX0201")
  47     (latin-jisx0201 . "JISX0201")
  48     (cyrillic-iso8859-5 . "ISO8859-5")
  49     (latin-iso8859-9 . "ISO8859-9")
  50     (japanese-jisx0208-1978 . "JISX0208.1978")
  51     (chinese-gb2312 . "GB2312")
  52     (japanese-jisx0208 . "JISX0208.1983")
  53     (korean-ksc5601 . "KSC5601")
  54     (japanese-jisx0212 . "JISX0212")
  55     (chinese-cns11643-1 . "CNS11643.1992-1")
  56     (chinese-cns11643-2 . "CNS11643.1992-2")
  57     (chinese-cns11643-3 . "CNS11643.1992-3")
  58     (chinese-cns11643-4 . "CNS11643.1992-4")
  59     (chinese-cns11643-5 . "CNS11643.1992-5")
  60     (chinese-cns11643-6 . "CNS11643.1992-6")
  61     (chinese-cns11643-7 . "CNS11643.1992-7")
  62     (chinese-big5-1 . "Big5")
  63     (chinese-big5-2 . "Big5")
  64     (chinese-sisheng . "sisheng_cwnn")
  65     (vietnamese-viscii-lower . "VISCII1.1")
  66     (vietnamese-viscii-upper . "VISCII1.1")
  67     (arabic-digit . "MuleArabic-0")
  68     (arabic-1-column . "MuleArabic-1")
  69     (arabic-2-column . "MuleArabic-2")
  70     (ipa . "MuleIPA")
  71     (ethiopic . "Ethiopic-Unicode")
  72     (ascii-right-to-left . "ISO8859-1")
  73     (indian-is13194 . "IS13194-Devanagari")
  74     (indian-2-column . "MuleIndian-2")
  75     (indian-1-column . "MuleIndian-1")
  76     (lao . "MuleLao-1")
  77     (tibetan . "MuleTibetan-0")
  78     (tibetan-1-column . "MuleTibetan-1")
  79     ))
  80
  81 (let ((l x-charset-registries))
  82   (while l
  83     (condition-case nil
  84         (put-charset-property (car (car l)) 'x-charset-registry (cdr (car l)))
  85       (error nil))
  86     (setq l (cdr l))))
  87
  88 ;; Set arguments in `font-encoding-alist' (which see).
  89 (defun set-font-encoding (pattern charset encoding)
  90   (let ((slot (assoc pattern font-encoding-alist)))
  91     (if slot
  92         (let ((place (assq charset (cdr slot))))
  93           (if place
  94               (setcdr place encoding)
  95             (setcdr slot (cons (cons charset encoding) (cdr slot)))))
  96       (setq font-encoding-alist
  97             (cons (list pattern (cons charset encoding)) font-encoding-alist)))
  98     ))
  99
 100 (set-font-encoding "ISO8859-1" 'ascii 0)
 101 (set-font-encoding "JISX0201" 'latin-jisx0201 0)
 102
 103 ;; Setting for suppressing XLoadQueryFont on big fonts.
 104 (setq x-pixel-size-width-font-regexp
 105       "gb2312\\|jisx0208\\|ksc5601\\|cns11643\\|big5")
 106
 107 ;;; XLFD (X Logical Font Description) format handler.
 108
 109 ;; Define XLFD's field index numbers.           ; field name
 110 (defconst xlfd-regexp-foundry-subnum 0)         ; FOUNDRY
 111 (defconst xlfd-regexp-family-subnum 1)          ; FAMILY_NAME
 112 (defconst xlfd-regexp-weight-subnum 2)          ; WEIGHT_NAME
 113 (defconst xlfd-regexp-slant-subnum 3)           ; SLANT
 114 (defconst xlfd-regexp-swidth-subnum 4)          ; SETWIDTH_NAME
 115 (defconst xlfd-regexp-adstyle-subnum 5)         ; ADD_STYLE_NAME
 116 (defconst xlfd-regexp-pixelsize-subnum 6)       ; PIXEL_SIZE
 117 (defconst xlfd-regexp-pointsize-subnum 7)       ; POINT_SIZE
 118 (defconst xlfd-regexp-resx-subnum 8)            ; RESOLUTION_X
 119 (defconst xlfd-regexp-resy-subnum 9)            ; RESOLUTION_Y
 120 (defconst xlfd-regexp-spacing-subnum 10)        ; SPACING
 121 (defconst xlfd-regexp-avgwidth-subnum 11)       ; AVERAGE_WIDTH
 122 (defconst xlfd-regexp-registry-subnum 12)       ; CHARSET_REGISTRY
 123 (defconst xlfd-regexp-encoding-subnum 13)       ; CHARSET_ENCODING
 124
 125 ;; Regular expression matching against a fontname which conforms to
 126 ;; XLFD (X Logical Font Description).  All fields in XLFD should be
 127 ;; not be omitted (but can be a wild card) to be matched.
 128 (defconst xlfd-tight-regexp
 129   "^\
 130 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
 131 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
 132 -\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)$")
 133
 134 ;; List of field numbers of XLFD whose values are numeric.
 135 (defconst xlfd-regexp-numeric-subnums
 136   (list xlfd-regexp-pixelsize-subnum    ;6
 137         xlfd-regexp-pointsize-subnum    ;7
 138         xlfd-regexp-resx-subnum         ;8
 139         xlfd-regexp-resy-subnum         ;9
 140         xlfd-regexp-avgwidth-subnum     ;11
 141         ))
 142
 143 (defun x-decompose-font-name (pattern)
 144   "Decompose PATTERN into XLFD's fields and return vector of the fields.
 145 The length of the vector is 14.
 146
 147 If PATTERN doesn't conform to XLFD, try to get a full XLFD name from
 148 X server and use the information of the full name to decompose
 149 PATTERN.  If no full XLFD name is gotten, return nil."
 150   (let (xlfd-fields fontname)
 151     (if (string-match xlfd-tight-regexp pattern)
 152         (let ((i 0))
 153           (setq xlfd-fields (make-vector 14 nil))
 154           (while (< i 14)
 155             (aset xlfd-fields i (match-string (1+ i) pattern))
 156             (setq i (1+ i)))
 157           xlfd-fields)
 158       (setq fontname (condition-case nil
 159                          (x-resolve-font-name pattern)
 160                        (error)))
 161       (if (and fontname
 162                (string-match xlfd-tight-regexp fontname))
 163           (let ((len (length pattern))
 164                 (i 0)
 165                 l)
 166             (setq xlfd-fields (make-vector 14 nil))
 167             (while (< i 14)
 168               (aset xlfd-fields i
 169                     (cons (match-beginning (1+ i))
 170                           (match-string (1+ i) fontname)))
 171               (setq i (1+ i)))
 172             (setq i 0)
 173             (while (< i len)
 174               (let ((ch (aref pattern i)))
 175                 (if (= ch ??)
 176                     (setq pattern (concat (substring pattern 0 i)
 177                                           "\\(.\\)"
 178                                           (substring pattern (1+ i)))
 179                           len (+ len 4)
 180                           i (+ i 4))
 181                   (if (= ch ?*)
 182                       (setq pattern (concat (substring pattern 0 i)
 183                                             "\\(.*\\)"
 184                                             (substring pattern (1+ i)))
 185                             len (+ len 5)
 186                             i (+ i 5))
 187                     (setq i (1+ i))))))
 188             (string-match pattern fontname)
 189             (setq l (cdr (cdr (match-data))))
 190             (setq i 0)
 191             (while (< i 14)
 192               (if (or (null l) (< (car (aref xlfd-fields i)) (car l)))
 193                   (progn
 194                     (aset xlfd-fields i (cdr (aref xlfd-fields i)))
 195                     (setq i (1+ i)))
 196                 (if (< (car (aref xlfd-fields i)) (car (cdr l)))
 197                     (progn
 198                       (aset xlfd-fields i "*")
 199                       (setq i (1+ i)))
 200                   (setq l (cdr (cdr l))))))
 201             xlfd-fields)))))
 202
 203 ;; Replace consecutive wild-cards (`*') in NAME to one.
 204 ;; Ex. (x-reduce-font-name "-*-*-*-iso8859-1") => "-*-iso8859-1"
 205 (defsubst x-reduce-font-name (name)
 206   (while (string-match "-\\*-\\(\\*-\\)+" name)
 207     (setq name (replace-match "-*-" t t name)))
 208   name)
 209
 210 (defun x-compose-font-name (xlfd-fields &optional reduce)
 211   "Compose X's fontname from FIELDS.
 212 FIELDS is a vector of XLFD fields.
 213 If a field is nil, wild-card letter `*' is embedded.
 214 Optional argument REDUCE non-nil means consecutive wild-cards are
 215 reduced to be one."
 216   (let ((name
 217          (concat "-" (mapconcat (lambda (x) (or x "*")) xlfd-fields "-"))))
 218     (if reduce
 219         (x-reduce-font-name name)
 220       name)))
 221
 222 (defun x-complement-fontset-spec (xlfd-fields fontlist)
 223   "Complement FONTLIST for all charsets based on XLFD-FIELDS and return it.
 224 XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
 225 FONTLIST is an alist of cons of charset and fontname.
 226
 227 Fontnames for charsets not listed in FONTLIST are generated from
 228 XLFD-FIELDS and a property of x-charset-registry of each charset
 229 automatically."
 230   (let ((charsets charset-list)
 231         (style-ignored (copy-sequence xlfd-fields))
 232         (size-ignored (copy-sequence xlfd-fields)))
 233     (aset style-ignored xlfd-regexp-weight-subnum nil)
 234     (aset style-ignored xlfd-regexp-slant-subnum nil)
 235     (aset style-ignored xlfd-regexp-swidth-subnum nil)
 236     (aset style-ignored xlfd-regexp-adstyle-subnum nil)
 237     (aset size-ignored xlfd-regexp-pixelsize-subnum nil)
 238     (aset size-ignored xlfd-regexp-pointsize-subnum nil)
 239     (aset size-ignored xlfd-regexp-resx-subnum nil)
 240     (aset size-ignored xlfd-regexp-resy-subnum nil)
 241     (aset size-ignored xlfd-regexp-spacing-subnum nil)
 242     (aset size-ignored xlfd-regexp-avgwidth-subnum nil)
 243     (while charsets
 244       (let ((charset (car charsets)))
 245         (if (null (assq charset fontlist))
 246             (let ((registry (get-charset-property charset
 247                                                   'x-charset-registry))
 248                   registry-val encoding-val fontname loose-fontname)
 249               (if (string-match "-" registry)
 250                   ;; REGISTRY contains `CHARSET_ENCODING' field.
 251                   (setq registry-val (substring registry 0 (match-beginning 0))
 252                         encoding-val (substring registry (match-end 0)))
 253                 (setq registry-val (concat registry "*")
 254                       encoding-val "*"))
 255               (aset xlfd-fields xlfd-regexp-registry-subnum registry-val)
 256               (aset xlfd-fields xlfd-regexp-encoding-subnum encoding-val)
 257               (aset style-ignored xlfd-regexp-registry-subnum registry-val)
 258               (aset style-ignored xlfd-regexp-encoding-subnum encoding-val)
 259               (aset size-ignored xlfd-regexp-registry-subnum registry-val)
 260               (aset size-ignored xlfd-regexp-encoding-subnum encoding-val)
 261               (setq fontname (x-compose-font-name xlfd-fields t))
 262               (setq fontlist (cons (cons charset fontname) fontlist))
 263               (or (assoc fontname alternative-fontname-alist)
 264                   (setq alternative-fontname-alist
 265                         (cons (list
 266                                fontname
 267                                (x-compose-font-name style-ignored t)
 268                                (x-compose-font-name size-ignored t)
 269                                (concat "*-" registry-val "-" encoding-val))
 270                               alternative-fontname-alist)))
 271               )))
 272       (setq charsets (cdr charsets))))
 273
 274   ;; Here's a trick for the charset latin-iso8859-1.  If font for
 275   ;; ascii also contains Latin-1 characters, use it also for
 276   ;; latin-iso8859-1.  This prevent loading a font for latin-iso8859-1
 277   ;; by a different name.
 278   (if (string-match (cdr (assq 'latin-iso8859-1 x-charset-registries))
 279                     (cdr (assq 'ascii fontlist)))
 280       (setcdr (assq 'latin-iso8859-1 fontlist) (cdr (assq 'ascii fontlist))))
 281   fontlist)
 282
 283 ;; Return a list to be appended to `x-fixed-font-alist' when
 284 ;; `mouse-set-font' is called.
 285 (defun generate-fontset-menu ()
 286   (let ((fontsets global-fontset-alist)
 287         fontset-name
 288         l)
 289     (while fontsets
 290       (setq fontset-name (car (car fontsets)) fontsets (cdr fontsets))
 291       (setq l (cons (list (fontset-plain-name fontset-name) fontset-name) l)))
 292     (cons "Fontset" l)))
 293
 294 (defun fontset-plain-name (fontset)
 295   "Return a plain and descriptive name of FONTSET."
 296   (if (not (setq fontset (query-fontset fontset)))
 297       (error "Invalid fontset: %s" fontset))
 298   (let ((xlfd-fields (x-decompose-font-name fontset)))
 299     (if xlfd-fields
 300         (let ((weight (aref xlfd-fields xlfd-regexp-weight-subnum))
 301               (slant  (aref xlfd-fields xlfd-regexp-slant-subnum))
 302               (swidth (aref xlfd-fields xlfd-regexp-swidth-subnum))
 303               (size   (aref xlfd-fields xlfd-regexp-pixelsize-subnum))
 304               (charset (aref xlfd-fields xlfd-regexp-registry-subnum))
 305               (nickname (aref xlfd-fields xlfd-regexp-encoding-subnum))
 306               name)
 307           (if (not (string= "fontset" charset))
 308               fontset
 309             (if (> (string-to-int size) 0)
 310                 (setq name (format "%s: %s-dot" nickname size))
 311               (setq name nickname))
 312             (cond ((string-match "^medium$" weight)
 313                    (setq name (concat name " " "medium")))
 314                   ((string-match "^bold$\\|^demibold$" weight)
 315                    (setq name (concat name " " weight))))
 316             (cond ((string-match "^i$" slant)
 317                    (setq name (concat name " " "italic")))
 318                   ((string-match "^o$" slant)
 319                    (setq name (concat name " " "slant")))
 320                   ((string-match "^ri$" slant)
 321                    (setq name (concat name " " "reverse italic")))
 322                   ((string-match "^ro$" slant)
 323                    (setq name (concat name " " "reverse slant"))))
 324             name))
 325       fontset)))
 326
 327 (defun create-fontset-from-fontset-spec (fontset-spec &optional style noerror)
 328   "Create a fontset from fontset specification string FONTSET-SPEC.
 329 FONTSET-SPEC is a string of the format:
 330         FONTSET-NAME,CHARSET-NAME0:FONT-NAME0,CHARSET-NAME1:FONT-NAME1, ...
 331 Any number of SPACE, TAB, and NEWLINE can be put before and after commas.
 332 If optional argument STYLE is specified, create a fontset of STYLE
 333 by modifying FONTSET-SPEC appropriately.  STYLE can be one of `bold',
 334 `italic', and `bold-italic'.
 335 If this function attempts to create already existing fontset, error is
 336 signaled unless the optional 3rd argument NOERROR is non-nil."
 337   (if (not (string-match "^[^,]+" fontset-spec))
 338       (error "Invalid fontset spec: %s" fontset-spec))
 339   (let ((idx (match-end 0))
 340         (name (match-string 0 fontset-spec))
 341         fontlist charset)
 342     ;; At first, extract pairs of charset and fontname from FONTSET-SPEC.
 343     (while (string-match "[, \t\n]*\\([^:]+\\):\\([^,]+\\)" fontset-spec idx)
 344       (setq idx (match-end 0))
 345       (setq charset (intern (match-string 1 fontset-spec)))
 346       (if (charsetp charset)
 347           (setq fontlist (cons (cons charset (match-string 2 fontset-spec))
 348                                fontlist))))
 349
 350     ;; If STYLE is specified, modify fontset name (NAME) and FONTLIST.
 351     (let ((func (cdr (assq style '((bold . x-make-font-bold)
 352                                    (italic . x-make-font-italic)
 353                                    (bold-italic . x-make-font-bold-italic)))))
 354           (l fontlist)
 355           new-name)
 356       (if (and func
 357                (setq new-name (funcall func name)))
 358           (progn
 359             (setq name new-name)
 360             (while l
 361               (if (setq new-name (funcall func (cdr (car l))))
 362                   (setcdr (car l) new-name))
 363               (setq l (cdr l))))))
 364
 365     ;; If NAME conforms to XLFD, complement FONTLIST for charsets not
 366     ;; specified in FONTSET-SPEC.
 367     (let ((xlfd-fields (x-decompose-font-name name)))
 368       (if xlfd-fields
 369           (setq fontlist
 370                 (x-complement-fontset-spec xlfd-fields fontlist))))
 371
 372     (if (and noerror (query-fontset name))
 373         ;; Don't try to create an already existing fontset.
 374         nil
 375       ;; Create the fontset, and define the alias if appropriate.
 376       (new-fontset name fontlist)
 377       (if (and (not style)
 378                (not (assoc name fontset-alias-alist))
 379                (string-match "fontset-.*$" name))
 380           (let ((alias (match-string 0 name)))
 381             (or (rassoc alias fontset-alias-alist)
 382                 (setq fontset-alias-alist
 383                       (cons (cons name alias) fontset-alias-alist))))))))
 384
 385 \f
 386 ;; Create standard fontset from 16 dots fonts which are the most widely
 387 ;; installed fonts.  Fonts for Chinese-GB, Korean, and Chinese-CNS are
 388 ;; specified here because FAMILY of those fonts are not "fixed" in
 389 ;; many cases.
 390 (defvar standard-fontset-spec
 391   "-*-fixed-medium-r-normal-*-16-*-*-*-*-*-fontset-standard,
 392         chinese-gb2312:-*-medium-r-normal-*-16-*-gb2312*-*,
 393         korean-ksc5601:-*-medium-r-normal-*-16-*-ksc5601*-*,
 394         chinese-cns11643-1:-*-medium-r-normal-*-16-*-cns11643*-1,
 395         chinese-cns11643-2:-*-medium-r-normal-*-16-*-cns11643*-2,
 396         chinese-cns11643-3:-*-medium-r-normal-*-16-*-cns11643*-3,
 397         chinese-cns11643-4:-*-medium-r-normal-*-16-*-cns11643*-4,
 398         chinese-cns11643-5:-*-medium-r-normal-*-16-*-cns11643*-5,
 399         chinese-cns11643-6:-*-medium-r-normal-*-16-*-cns11643*-6,
 400         chinese-cns11643-7:-*-medium-r-normal-*-16-*-cns11643*-7"
 401   "String of fontset spec of the standard fontset.
 402 You have the biggest chance to display international characters
 403 with correct glyphs by using the standard fontset.
 404 See the documentation of `create-fontset-from-fontset-spec' for the format.")
 405
 406 ;; Create fontsets from X resources of the name `fontset-N (class
 407 ;; Fontset-N)' where N is integer 0, 1, ...
 408 ;; The values of the resources the string of the same format as
 409 ;; `standard-fontset-spec'.
 410
 411 (defun create-fontset-from-x-resource ()
 412   (let ((idx 0)
 413         fontset-spec)
 414     (while (setq fontset-spec (x-get-resource (concat "fontset-" idx)
 415                                               (concat "Fontset-" idx)))
 416       (create-fontset-from-fontset-spec fontset-spec nil 'noerror)
 417       (setq idx (1+ idx)))))
 418
 419 (defsubst fontset-list ()
 420   "Returns a list of all defined fontset names."
 421   (mapcar 'car global-fontset-alist))
 422
 423 ;;
 424 (provide 'fontset)
 425
 426 ;;; fontset.el ends here