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emacs/lisp/international/fontset.el
Richard M. Stallman 2725d3db09 (uninstantiated-fontset-alist):
Variable name spelling fixed, and doc fix.  All uses fixed.
(instantiate-fontset): Function name spelling fixed.
1997-09-05 23:40:12 +00:00

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;;; fontset.el --- Commands for handling fontset.
;; Copyright (C) 1995, 1997 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
;; Keywords: mule, multilingual, fontset
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
;; Set standard REGISTRY property of charset to find an appropriate
;; font for each charset. This is used to generate a font name in a
;; fontset. If the value contains a character `-', the string before
;; that is embeded in `CHARSET_REGISTRY' field, and the string after
;; that is embeded in `CHARSET_ENCODING' field. If the value does not
;; contain `-', the whole string is embeded in `CHARSET_REGISTRY'
;; field, and a wild card character `*' is embeded in
;; `CHARSET_ENCODING' field.
(defvar x-charset-registries
'((ascii . "ISO8859-1")
(latin-iso8859-1 . "ISO8859-1")
(latin-iso8859-2 . "ISO8859-2")
(latin-iso8859-3 . "ISO8859-3")
(latin-iso8859-4 . "ISO8859-4")
(thai-tis620 . "TIS620")
(greek-iso8859-7 . "ISO8859-7")
(arabic-iso8859-6 . "ISO8859-6")
(hebrew-iso8859-8 . "ISO8859-8")
(katakana-jisx0201 . "JISX0201")
(latin-jisx0201 . "JISX0201")
(cyrillic-iso8859-5 . "ISO8859-5")
(latin-iso8859-9 . "ISO8859-9")
(japanese-jisx0208-1978 . "JISX0208.1978")
(chinese-gb2312 . "GB2312")
(japanese-jisx0208 . "JISX0208.1983")
(korean-ksc5601 . "KSC5601")
(japanese-jisx0212 . "JISX0212")
(chinese-cns11643-1 . "CNS11643.1992-1")
(chinese-cns11643-2 . "CNS11643.1992-2")
(chinese-cns11643-3 . "CNS11643.1992-3")
(chinese-cns11643-4 . "CNS11643.1992-4")
(chinese-cns11643-5 . "CNS11643.1992-5")
(chinese-cns11643-6 . "CNS11643.1992-6")
(chinese-cns11643-7 . "CNS11643.1992-7")
(chinese-big5-1 . "Big5")
(chinese-big5-2 . "Big5")
(chinese-sisheng . "sisheng_cwnn")
(vietnamese-viscii-lower . "VISCII1.1")
(vietnamese-viscii-upper . "VISCII1.1")
(arabic-digit . "MuleArabic-0")
(arabic-1-column . "MuleArabic-1")
(arabic-2-column . "MuleArabic-2")
(ipa . "MuleIPA")
(ethiopic . "Ethiopic-Unicode")
(ascii-right-to-left . "ISO8859-1")
(indian-is13194 . "IS13194-Devanagari")
(indian-2-column . "MuleIndian-2")
(indian-1-column . "MuleIndian-1")
(lao . "MuleLao-1")
(tibetan . "MuleTibetan-0")
(tibetan-1-column . "MuleTibetan-1")
))
(let ((l x-charset-registries))
(while l
(condition-case nil
(put-charset-property (car (car l)) 'x-charset-registry (cdr (car l)))
(error nil))
(setq l (cdr l))))
;; Set arguments in `font-encoding-alist' (which see).
(defun set-font-encoding (pattern charset encoding)
(let ((slot (assoc pattern font-encoding-alist)))
(if slot
(let ((place (assq charset (cdr slot))))
(if place
(setcdr place encoding)
(setcdr slot (cons (cons charset encoding) (cdr slot)))))
(setq font-encoding-alist
(cons (list pattern (cons charset encoding)) font-encoding-alist)))
))
(set-font-encoding "ISO8859-1" 'ascii 0)
(set-font-encoding "JISX0201" 'latin-jisx0201 0)
;; Setting for suppressing XLoadQueryFont on big fonts.
(setq x-pixel-size-width-font-regexp
"gb2312\\|jisx0208\\|ksc5601\\|cns11643\\|big5")
;;; XLFD (X Logical Font Description) format handler.
;; Define XLFD's field index numbers. ; field name
(defconst xlfd-regexp-foundry-subnum 0) ; FOUNDRY
(defconst xlfd-regexp-family-subnum 1) ; FAMILY_NAME
(defconst xlfd-regexp-weight-subnum 2) ; WEIGHT_NAME
(defconst xlfd-regexp-slant-subnum 3) ; SLANT
(defconst xlfd-regexp-swidth-subnum 4) ; SETWIDTH_NAME
(defconst xlfd-regexp-adstyle-subnum 5) ; ADD_STYLE_NAME
(defconst xlfd-regexp-pixelsize-subnum 6) ; PIXEL_SIZE
(defconst xlfd-regexp-pointsize-subnum 7) ; POINT_SIZE
(defconst xlfd-regexp-resx-subnum 8) ; RESOLUTION_X
(defconst xlfd-regexp-resy-subnum 9) ; RESOLUTION_Y
(defconst xlfd-regexp-spacing-subnum 10) ; SPACING
(defconst xlfd-regexp-avgwidth-subnum 11) ; AVERAGE_WIDTH
(defconst xlfd-regexp-registry-subnum 12) ; CHARSET_REGISTRY
(defconst xlfd-regexp-encoding-subnum 13) ; CHARSET_ENCODING
;; Regular expression matching against a fontname which conforms to
;; XLFD (X Logical Font Description). All fields in XLFD should be
;; not be omitted (but can be a wild card) to be matched.
(defconst xlfd-tight-regexp
"^\
-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)$")
;; List of field numbers of XLFD whose values are numeric.
(defconst xlfd-regexp-numeric-subnums
(list xlfd-regexp-pixelsize-subnum ;6
xlfd-regexp-pointsize-subnum ;7
xlfd-regexp-resx-subnum ;8
xlfd-regexp-resy-subnum ;9
xlfd-regexp-avgwidth-subnum ;11
))
(defun x-decompose-font-name (pattern)
"Decompose PATTERN into XLFD's fields and return vector of the fields.
The length of the vector is 14.
If PATTERN doesn't conform to XLFD, try to get a full XLFD name from
X server and use the information of the full name to decompose
PATTERN. If no full XLFD name is gotten, return nil."
(let (xlfd-fields fontname)
(if (string-match xlfd-tight-regexp pattern)
(let ((i 0))
(setq xlfd-fields (make-vector 14 nil))
(while (< i 14)
(aset xlfd-fields i (match-string (1+ i) pattern))
(setq i (1+ i)))
xlfd-fields)
(setq fontname (condition-case nil
(x-resolve-font-name pattern)
(error)))
(if (and fontname
(string-match xlfd-tight-regexp fontname))
(let ((len (length pattern))
(i 0)
l)
(setq xlfd-fields (make-vector 14 nil))
(while (< i 14)
(aset xlfd-fields i
(cons (match-beginning (1+ i))
(match-string (1+ i) fontname)))
(setq i (1+ i)))
(setq i 0)
(while (< i len)
(let ((ch (aref pattern i)))
(if (= ch ??)
(setq pattern (concat (substring pattern 0 i)
"\\(.\\)"
(substring pattern (1+ i)))
len (+ len 4)
i (+ i 4))
(if (= ch ?*)
(setq pattern (concat (substring pattern 0 i)
"\\(.*\\)"
(substring pattern (1+ i)))
len (+ len 5)
i (+ i 5))
(setq i (1+ i))))))
(string-match pattern fontname)
(setq l (cdr (cdr (match-data))))
(setq i 0)
(while (< i 14)
(if (or (null l) (< (car (aref xlfd-fields i)) (car l)))
(progn
(aset xlfd-fields i (cdr (aref xlfd-fields i)))
(setq i (1+ i)))
(if (< (car (aref xlfd-fields i)) (car (cdr l)))
(progn
(aset xlfd-fields i "*")
(setq i (1+ i)))
(setq l (cdr (cdr l))))))
xlfd-fields)))))
;; Replace consecutive wild-cards (`*') in NAME to one.
;; Ex. (x-reduce-font-name "-*-*-*-iso8859-1") => "-*-iso8859-1"
(defsubst x-reduce-font-name (name)
(while (string-match "-\\*-\\(\\*-\\)+" name)
(setq name (replace-match "-*-" t t name)))
name)
(defun x-compose-font-name (xlfd-fields &optional reduce)
"Compose X's fontname from FIELDS.
FIELDS is a vector of XLFD fields.
If a field is nil, wild-card letter `*' is embedded.
Optional argument REDUCE non-nil means consecutive wild-cards are
reduced to be one."
(let ((name
(concat "-" (mapconcat (lambda (x) (or x "*")) xlfd-fields "-"))))
(if reduce
(x-reduce-font-name name)
name)))
(defun register-alternate-fontnames (fontname)
"Register alternate fontnames for FONTNAME in `alternate-fontname-alist'.
When Emacs fails to open FONTNAME, it tries to open alternate font
registered in the variable `alternate-fontname-alist' (which see).
For FONTNAME, the following three alternate fontnames are registered:
fontname which ignores style specification of FONTNAME,
fontname which ignores size specification of FONTNAME,
fontname which ignores both style and size specification of FONTNAME."
(unless (assoc fontname alternate-fontname-alist)
(let ((xlfd-fields (x-decompose-font-name fontname))
style-ignored size-ignored both-ignored)
(when xlfd-fields
(aset xlfd-fields xlfd-regexp-foundry-subnum nil)
(aset xlfd-fields xlfd-regexp-family-subnum nil)
(let ((temp (copy-sequence xlfd-fields)))
(aset temp xlfd-regexp-weight-subnum nil)
(aset temp xlfd-regexp-slant-subnum nil)
(aset temp xlfd-regexp-swidth-subnum nil)
(aset temp xlfd-regexp-adstyle-subnum nil)
(setq style-ignored (x-compose-font-name temp t)))
(aset xlfd-fields xlfd-regexp-pixelsize-subnum nil)
(aset xlfd-fields xlfd-regexp-pointsize-subnum nil)
(aset xlfd-fields xlfd-regexp-resx-subnum nil)
(aset xlfd-fields xlfd-regexp-resy-subnum nil)
(aset xlfd-fields xlfd-regexp-spacing-subnum nil)
(aset xlfd-fields xlfd-regexp-avgwidth-subnum nil)
(setq size-ignored (x-compose-font-name xlfd-fields t))
(aset xlfd-fields xlfd-regexp-weight-subnum nil)
(aset xlfd-fields xlfd-regexp-slant-subnum nil)
(aset xlfd-fields xlfd-regexp-swidth-subnum nil)
(aset xlfd-fields xlfd-regexp-adstyle-subnum nil)
(setq both-ignored (x-compose-font-name xlfd-fields t))
(setq alternate-fontname-alist
(cons (list fontname style-ignored size-ignored both-ignored)
alternate-fontname-alist))))))
(defun x-complement-fontset-spec (xlfd-fields fontlist)
"Complement FONTLIST for all charsets based on XLFD-FIELDS and return it.
XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
FONTLIST is an alist of cons of charset and fontname.
Fontnames for charsets not listed in FONTLIST are generated from
XLFD-FIELDS and a property of x-charset-registry of each charset
automatically."
(let ((charsets charset-list))
(while charsets
(let ((charset (car charsets)))
(unless (assq charset fontlist)
(let ((registry (get-charset-property charset
'x-charset-registry))
registry-val encoding-val fontname loose-fontname)
(if (string-match "-" registry)
;; REGISTRY contains `CHARSET_ENCODING' field.
(setq registry-val (substring registry 0 (match-beginning 0))
encoding-val (substring registry (match-end 0)))
(setq registry-val (concat registry "*")
encoding-val "*"))
(aset xlfd-fields xlfd-regexp-registry-subnum registry-val)
(aset xlfd-fields xlfd-regexp-encoding-subnum encoding-val)
(setq fontname (downcase (x-compose-font-name xlfd-fields)))
(setq fontlist (cons (cons charset fontname) fontlist))
(register-alternate-fontnames fontname))))
(setq charsets (cdr charsets))))
;; Here's a trick for the charset latin-iso8859-1. If font for
;; ascii also contains Latin-1 characters, use it also for
;; latin-iso8859-1. This prevent loading a font for latin-iso8859-1
;; by a different name.
(if (string-match (cdr (assq 'latin-iso8859-1 x-charset-registries))
(cdr (assq 'ascii fontlist)))
(setcdr (assq 'latin-iso8859-1 fontlist) (cdr (assq 'ascii fontlist))))
fontlist)
(defun fontset-name-p (fontset)
"Return non-nil if FONTSET is valid as fontset name.
A valid fontset name should conform to XLFD (X Logical Font Description)
with \"fontset\" in `<CHARSET_REGISTRY> field."
(and (string-match xlfd-tight-regexp fontset)
(string= (match-string (1+ xlfd-regexp-registry-subnum) fontset)
"fontset")))
;; Return a list to be appended to `x-fixed-font-alist' when
;; `mouse-set-font' is called.
(defun generate-fontset-menu ()
(let ((fontsets global-fontset-alist)
fontset-name
l)
(while fontsets
(setq fontset-name (car (car fontsets)) fontsets (cdr fontsets))
(setq l (cons (list (fontset-plain-name fontset-name) fontset-name) l)))
(cons "Fontset" l)))
(defun fontset-plain-name (fontset)
"Return a plain and descriptive name of FONTSET."
(if (not (setq fontset (query-fontset fontset)))
(error "Invalid fontset: %s" fontset))
(let ((xlfd-fields (x-decompose-font-name fontset)))
(if xlfd-fields
(let ((weight (aref xlfd-fields xlfd-regexp-weight-subnum))
(slant (aref xlfd-fields xlfd-regexp-slant-subnum))
(swidth (aref xlfd-fields xlfd-regexp-swidth-subnum))
(size (aref xlfd-fields xlfd-regexp-pixelsize-subnum))
(charset (aref xlfd-fields xlfd-regexp-registry-subnum))
(nickname (aref xlfd-fields xlfd-regexp-encoding-subnum))
name)
(if (not (string= "fontset" charset))
fontset
(if (> (string-to-int size) 0)
(setq name (format "%s: %s-dot" nickname size))
(setq name nickname))
(cond ((string-match "^medium$" weight)
(setq name (concat name " " "medium")))
((string-match "^bold$\\|^demibold$" weight)
(setq name (concat name " " weight))))
(cond ((string-match "^i$" slant)
(setq name (concat name " " "italic")))
((string-match "^o$" slant)
(setq name (concat name " " "slant")))
((string-match "^ri$" slant)
(setq name (concat name " " "reverse italic")))
((string-match "^ro$" slant)
(setq name (concat name " " "reverse slant"))))
name))
fontset)))
(defvar uninstantiated-fontset-alist nil
"Alist of fontset names vs. information for instantiating them.
Each element has the form (FONTSET STYLE BASE-FONTSET), where
FONTSET is a name of fontset not yet instantiated.
STYLE is a style of FONTSET, one of the followings:
bold, demobold, italic, oblique,
bold-italic, demibold-italic, bold-oblique, demibold-oblique.
BASE-FONTSET is a name of fontset base from which FONSET is instantiated.")
(defun create-fontset-from-fontset-spec (fontset-spec &optional style noerror)
"Create a fontset from fontset specification string FONTSET-SPEC.
FONTSET-SPEC is a string of the format:
FONTSET-NAME,CHARSET-NAME0:FONT-NAME0,CHARSET-NAME1:FONT-NAME1, ...
Any number of SPACE, TAB, and NEWLINE can be put before and after commas.
If optional argument STYLE is specified, create a fontset of STYLE
by modifying FONTSET-SPEC appropriately. STYLE can be one of `bold',
`italic', and `bold-italic'.
If this function attempts to create already existing fontset, error is
signaled unless the optional 3rd argument NOERROR is non-nil."
(if (not (string-match "^[^,]+" fontset-spec))
(error "Invalid fontset spec: %s" fontset-spec))
(let ((idx (match-end 0))
(name (match-string 0 fontset-spec))
fontlist charset)
;; At first, extract pairs of charset and fontname from FONTSET-SPEC.
(while (string-match "[, \t\n]*\\([^:]+\\):\\([^,]+\\)" fontset-spec idx)
(setq idx (match-end 0))
(setq charset (intern (match-string 1 fontset-spec)))
(if (charsetp charset)
(setq fontlist (cons (cons charset (match-string 2 fontset-spec))
fontlist))))
;; If NAME conforms to XLFD, complement FONTLIST for charsets not
;; specified in FONTSET-SPEC.
(let ((xlfd-fields (x-decompose-font-name name)))
(if xlfd-fields
(setq fontlist
(x-complement-fontset-spec xlfd-fields fontlist))))
;; If STYLE is specified, modify fontset name (NAME) and FONTLIST.
(if nil
(let ((func (cdr (assq style '((bold . x-make-font-bold)
(italic . x-make-font-italic)
(bold-italic . x-make-font-bold-italic)))))
(l fontlist)
new-name)
(if (and func
(setq new-name (funcall func name)))
(progn
(setq name new-name)
(while l
(if (setq new-name (funcall func (cdr (car l))))
(setcdr (car l) new-name))
(setq l (cdr l))))))
(let ((funcs-alist
'((bold x-make-font-bold)
(demibold x-make-font-demibold)
(italic x-make-font-italic)
(oblique x-make-font-oblique)
(bold-italic x-make-font-bold x-make-font-italic)
(demibold-italic x-make-font-demibold x-make-font-italic)
(bold-oblique x-make-font-bold x-make-font-oblique)
(demibold-oblique x-make-font-demibold x-make-font-oblique)))
new-name style funcs)
(while funcs-alist
(setq funcs (car funcs-alist))
(setq style (car funcs))
(setq funcs (cdr funcs))
(setq new-name name)
(while funcs
(setq new-name (funcall (car funcs) new-name))
(setq funcs (cdr funcs)))
(setq uninstantiated-fontset-alist
(cons (list new-name style name) uninstantiated-fontset-alist))
(setq funcs-alist (cdr funcs-alist)))))
(if (and noerror (query-fontset name))
;; Don't try to create an already existing fontset.
nil
;; Create the fontset, and define the alias if appropriate.
(new-fontset name fontlist)
(if (and (not style)
(not (assoc name fontset-alias-alist))
(string-match "fontset-.*$" name))
(let ((alias (match-string 0 name)))
(or (rassoc alias fontset-alias-alist)
(setq fontset-alias-alist
(cons (cons name alias) fontset-alias-alist))))))))
(defun instantiate-fontset (fontset)
"Create a new fontset FONTSET if it is not yet instantiated.
Return FONTSET if it is created successfully, else return nil."
(let ((fontset-data (assoc fontset uninstantiated-fontset-alist)))
(if (null fontset-data)
nil
(let ((style (nth 1 fontset-data))
(base-fontset (nth 2 fontset-data))
(funcs-alist
'((bold x-make-font-bold)
(demibold x-make-font-demibold)
(italic x-make-font-italic)
(oblique x-make-font-oblique)
(bold-italic x-make-font-bold x-make-font-italic)
(demibold-italic x-make-font-demibold x-make-font-italic)
(bold-oblique x-make-font-bold x-make-font-oblique)
(demibold-oblique x-make-font-demibold x-make-font-oblique)))
ascii-font font font2 funcs)
(setq uninstantiated-fontset-alist
(delete fontset-data uninstantiated-fontset-alist))
(setq fontset-data (assoc base-fontset global-fontset-alist))
(setq ascii-font (cdr (assq 'ascii (cdr fontset-data))))
(setq funcs (cdr (assq style funcs-alist)))
(if (= (length funcs) 1)
(and (setq font (funcall (car funcs) ascii-font))
(setq font (x-resolve-font-name font 'default)))
(and (setq font (funcall (car funcs) ascii-font))
(not (equal font ascii-font))
(setq font2 (funcall (nth 1 funcs) font))
(not (equal font2 font))
(setq font (x-resolve-font-name font2 'default))))
(when font
(let ((new-fontset-data (copy-alist fontset-data)))
(setq funcs (cdr (assq style funcs-alist)))
(while funcs
(setcar new-fontset-data
(funcall (car funcs) (car new-fontset-data)))
(let ((l (cdr new-fontset-data)))
(while l
(if (= (length funcs) 1)
(setq font (funcall (car funcs) (cdr (car l))))
(and (setq font (funcall (car funcs) (cdr (car l))))
(not (equal font (cdr (car l))))
(setq font2 (funcall (nth 1 funcs) font))
(not (equal font2 font))
(setq font font2)))
(when font
(setcdr (car l) font)
(register-alternate-fontnames font))
(setq l (cdr l))))
(setq funcs (cdr funcs)))
(new-fontset (car new-fontset-data) (cdr new-fontset-data))
(car new-fontset-data)))))))
;; Create standard fontset from 16 dots fonts which are the most widely
;; installed fonts. Fonts for Chinese-GB, Korean, and Chinese-CNS are
;; specified here because FAMILY of those fonts are not "fixed" in
;; many cases.
(defvar standard-fontset-spec
"-*-fixed-medium-r-normal-*-16-*-*-*-*-*-fontset-standard,
chinese-gb2312:-*-medium-r-normal-*-16-*-gb2312*-*,
korean-ksc5601:-*-medium-r-normal-*-16-*-ksc5601*-*,
chinese-cns11643-1:-*-medium-r-normal-*-16-*-cns11643*-1,
chinese-cns11643-2:-*-medium-r-normal-*-16-*-cns11643*-2,
chinese-cns11643-3:-*-medium-r-normal-*-16-*-cns11643*-3,
chinese-cns11643-4:-*-medium-r-normal-*-16-*-cns11643*-4,
chinese-cns11643-5:-*-medium-r-normal-*-16-*-cns11643*-5,
chinese-cns11643-6:-*-medium-r-normal-*-16-*-cns11643*-6,
chinese-cns11643-7:-*-medium-r-normal-*-16-*-cns11643*-7"
"String of fontset spec of the standard fontset.
You have the biggest chance to display international characters
with correct glyphs by using the standard fontset.
See the documentation of `create-fontset-from-fontset-spec' for the format.")
;; Create fontsets from X resources of the name `fontset-N (class
;; Fontset-N)' where N is integer 0, 1, ...
;; The values of the resources the string of the same format as
;; `standard-fontset-spec'.
(defun create-fontset-from-x-resource ()
(let ((idx 0)
fontset-spec)
(while (setq fontset-spec (x-get-resource (concat "fontset-" idx)
(concat "Fontset-" idx)))
(create-fontset-from-fontset-spec fontset-spec nil 'noerror)
(setq idx (1+ idx)))))
(defsubst fontset-list ()
"Returns a list of all defined fontset names."
(mapcar 'car global-fontset-alist))
;;
(provide 'fontset)
;;; fontset.el ends here