;;; composite.el --- support character composition
-;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+;; 2008, 2009
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H14PRO021
+;; Author: Kenichi HANDA <handa@etl.go.jp>
+;; (according to ack.texi)
;; Keywords: mule, multilingual, character composition
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
;; 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
nref (car nref))
(or (and (>= xoff -100) (<= xoff 100)
(>= yoff -100) (<= yoff 100))
- (error "Invalid compostion rule: %s" rule))
+ (error "Invalid composition rule: %s" rule))
(setq xoff (+ xoff 128) yoff (+ yoff 128)))
;; (GREF . NREF)
(setq xoff 0 yoff 0))
(defun compose-region (start end &optional components modification-func)
"Compose characters in the current region.
-Characters are composed relatively, i.e. composed by overstricking or
-stacking depending on ascent, descent and other properties.
+Characters are composed relatively, i.e. composed by overstriking
+or stacking depending on ascent, descent and other metrics of
+glyphs.
+
+For instance, if the region has three characters \"XYZ\", X is
+regarded as BASE glyph, and Y is displayed:
+ (1) above BASE if Y's descent value is not positive
+ (2) below BASE if Y's ascent value is not positive
+ (3) on BASE (i.e. at the BASE position) otherwise
+and Z is displayed with the same rule while regarding the whole
+XY glyphs as BASE.
When called from a program, expects these four arguments.
If it is a character, it is an alternate character to display instead
of the text in the region.
-If it is a string, the elements are alternate characters.
+If it is a string, the elements are alternate characters. In
+this case, TAB element has a special meaning. If the first
+characer is TAB, the glyphs are displayed with left padding space
+so that no pixel overlaps with the previous column. If the last
+character is TAB, the glyphs are displayed with rigth padding
+space so that no pixel overlaps with the following column.
If it is a vector or list, it is a sequence of alternate characters and
composition rules, where (2N)th elements are characters and (2N+1)th
of FROM, TO, and VALID-P.
FROM and TO specify the range of text that has the same `composition'
-property, VALID-P is non-nil if and only if this composition is valid.
+property, VALID-P is t if this composition is valid, and nil if not.
If there's no composition at POS, and the optional 2nd argument LIMIT
is non-nil, search for a composition toward LIMIT.
MOD-FUNC is a modification function of the composition.
-WIDTH is a number of columns the composition occupies on the screen."
+WIDTH is a number of columns the composition occupies on the screen.
+
+When Automatic Compostion mode is on, this function also finds a
+chunk of text that is automatically composed. If such a chunk is
+found closer to POS than the position that has `composition'
+property, the value is a list of FROM, TO, and a glyph gstring
+the specify how the chunk is composed. See the function
+`composition-get-gstring' for the format of the glyph string."
(let ((result (find-composition-internal pos limit string detail-p)))
- (if (and detail-p result (nth 2 result) (not (nth 3 result)))
+ (if (and detail-p (> (length result) 3) (nth 2 result) (not (nth 3 result)))
;; This is a valid rule-base composition.
(decode-composition-components (nth 2 result) 'nocopy))
result))
(defun compose-chars-after (pos &optional limit object)
"Compose characters in current buffer after position POS.
-It looks up the char-table `composition-function-table' (which see) by
-a character after POS. If non-nil value is found, the format of the
-value should be an alist of PATTERNs vs FUNCs, where PATTERNs are
-regular expressions and FUNCs are functions. If the text after POS
-matches one of PATTERNs, call the corresponding FUNC with three
-arguments POS, TO, and PATTERN, where TO is the end position of text
-matching PATTERN, and return what FUNC returns. Otherwise, return
-nil.
-
-FUNC is responsible for composing the text properly. The return value
-is:
- nil -- if no characters were composed.
- CHARS (integer) -- if CHARS characters were composed.
+It looks up the char-table `composition-function-table' (which
+see) by a character at POS, and compose characters after POS
+according to the contents of `composition-function-table'.
-Optional 2nd arg LIMIT, if non-nil, limits the matching of text.
+Optional 2nd arg LIMIT, if non-nil, limits characters to compose.
Optional 3rd arg OBJECT, if non-nil, is a string that contains the
text to compose. In that case, POS and LIMIT index into the string.
This function is the default value of `compose-chars-after-function'."
(let ((tail (aref composition-function-table (char-after pos)))
+ (font-obj (and (display-multi-font-p)
+ (and (not (stringp object))
+ (font-at pos (selected-window)))))
pattern func result)
- (when tail
+ (or limit
+ (setq limit (if (stringp object) (length object) (point-max))))
+ (when (and font-obj tail)
(save-match-data
(save-excursion
- (while (and tail (not func))
- (setq pattern (car (car tail))
- func (cdr (car tail)))
+ (while tail
+ (if (functionp (car tail))
+ (setq pattern nil func (car tail))
+ (setq pattern (car (car tail))
+ func (cdr (car tail))))
(goto-char pos)
- (if (if limit
- (and (re-search-forward pattern limit t)
- (= (match-beginning 0) pos))
- (looking-at pattern))
- (setq result (funcall func pos (match-end 0) pattern nil))
- (setq func nil tail (cdr tail)))))))
- result))
+ (if pattern
+ (if (and (if (stringp object)
+ (eq (string-match pattern object) 0)
+ (looking-at pattern))
+ (<= (match-end 0) limit))
+ (setq result
+ (funcall func pos (match-end 0) font-obj object)))
+ (setq result (funcall func pos limit font-obj object)))
+ (if result (setq tail nil))))))
+ result))
(defun compose-last-chars (args)
"Compose last characters.
\f
;;; Automatic character composition.
-(defvar composition-function-table
- (make-char-table nil)
- "Char table of functions for automatic character composition.
-For each character that has to be composed automatically with
-preceding and/or following characters, this char table contains
-a function to call to compose that character.
-
-Each function is called with two arguments, POS and STRING.
-
-If STRING is nil, POS is a position in the current buffer, and the
-function has to compose a character at POS with surrounding characters
-in the current buffer.
-
-Otherwise, STRING is a string, and POS is an index into the string. In
-this case, the function has to compose a character at POS with
-surrounding characters in the string.
-
-See also the command `toggle-auto-composition'.")
-
;; Copied from font-lock.el.
(eval-when-compile
;; Borrowed from lazy-lock.el.
(put 'save-buffer-state 'lisp-indent-function 1)
-;; This function is called when a composition created by
-;; terminal-composition-function is partially modified.
-(defun terminal-composition-modification (from to)
- (terminal-composition-function from))
-
-(defun terminal-composition-function (pos &optional string)
- "General composition function used on terminal.
-Non-spacing characters are composed with the preceding spacing
-character. All non-spacing characters has this function in
-`terminal-composition-function-table'."
- (let ((from (1- pos))
- ch)
- (if string
- (length string)
- (setq pos (1+ pos))
- (while (and (< pos (point-max))
- (= (aref char-width-table (char-after pos)) 0))
- (setq pos (1+ pos)))
- (if (and (>= from (point-min))
- (= (aref (symbol-name (get-char-code-property
- (char-after from)
- 'general-category)) 0) ?L))
- (compose-region from pos (buffer-substring from pos))
- (compose-region (1+ from) pos
- (concat " " (buffer-substring (1+ from) pos))
- 'terminal-composition-modification))
- pos)))
-
-(defvar terminal-composition-function-table
- (let ((table (make-char-table nil)))
- (map-char-table
- #'(lambda (key val)
- (if (= val 0) (set-char-table-range table key
- 'terminal-composition-function)))
- char-width-table)
- table)
- "Char table of functions for automatic character composition on terminal.
-This is like `composition-function-table' but used when Emacs is running
-on a terminal.")
-
-(defvar auto-compose-current-font nil
- "The current font-object used for characters being composed automatically.")
-
-(defun auto-compose-chars (pos string window)
- "Compose characters after the buffer position POS.
-If STRING is non-nil, it is a string, and POS is an index into the string.
-In that case, compose characters in the string.
-WINDOW is a window displaying the current buffer.
+;; These macros must match with C macros LGSTRING_XXX and LGLYPH_XXX in font.h
+(defsubst lgstring-header (gstring) (aref gstring 0))
+(defsubst lgstring-set-header (gstring header) (aset gstring 0 header))
+(defsubst lgstring-font (gstring) (aref (lgstring-header gstring) 0))
+(defsubst lgstring-char (gstring i) (aref (lgstring-header gstring) (1+ i)))
+(defsubst lgstring-char-len (gstring) (1- (length (lgstring-header gstring))))
+(defsubst lgstring-shaped-p (gstring) (aref gstring 1))
+(defsubst lgstring-set-id (gstring id) (aset gstring 1 id))
+(defsubst lgstring-glyph (gstring i) (aref gstring (+ i 2)))
+(defsubst lgstring-glyph-len (gstring) (- (length gstring) 2))
+(defsubst lgstring-set-glyph (gstring i glyph) (aset gstring (+ i 2) glyph))
+
+(defsubst lglyph-from (glyph) (aref glyph 0))
+(defsubst lglyph-to (glyph) (aref glyph 1))
+(defsubst lglyph-char (glyph) (aref glyph 2))
+(defsubst lglyph-code (glyph) (aref glyph 3))
+(defsubst lglyph-width (glyph) (aref glyph 4))
+(defsubst lglyph-lbearing (glyph) (aref glyph 5))
+(defsubst lglyph-rbearing (glyph) (aref glyph 6))
+(defsubst lglyph-ascent (glyph) (aref glyph 7))
+(defsubst lglyph-descent (glyph) (aref glyph 8))
+(defsubst lglyph-adjustment (glyph) (aref glyph 9))
+
+(defsubst lglyph-set-from-to (glyph from to)
+ (progn (aset glyph 0 from) (aset glyph 1 to)))
+(defsubst lglyph-set-char (glyph char) (aset glyph 2 char))
+(defsubst lglyph-set-code (glyph code) (aset glyph 3 code))
+(defsubst lglyph-set-width (glyph width) (aset glyph 4 width))
+(defsubst lglyph-set-adjustment (glyph &optional xoff yoff wadjust)
+ (aset glyph 9 (vector (or xoff 0) (or yoff 0) (or wadjust 0))))
+
+(defsubst lglyph-copy (glyph) (copy-sequence glyph))
+
+(defun lgstring-insert-glyph (gstring idx glyph)
+ (let ((nglyphs (lgstring-glyph-len gstring))
+ (i idx) g)
+ (while (and (< i nglyphs) (setq g (lgstring-glyph gstring i)))
+ (setq i (1+ i)))
+ (if (= i nglyphs)
+ (setq gstring (vconcat gstring (vector glyph)))
+ (if (< (1+ i) nglyphs)
+ (lgstring-set-glyph gstring (1+ i) nil)))
+ (while (> i idx)
+ (lgstring-set-glyph gstring i (lgstring-glyph gstring (1- i)))
+ (setq i (1- i)))
+ (lgstring-set-glyph gstring i glyph)
+ gstring))
+
+(defun compose-glyph-string (gstring from to)
+ (let ((glyph (lgstring-glyph gstring from))
+ from-pos to-pos
+ ascent descent lbearing rbearing)
+ (setq from-pos (lglyph-from glyph)
+ to-pos (lglyph-to (lgstring-glyph gstring (1- to))))
+ (lglyph-set-from-to glyph from-pos to-pos)
+ (setq from (1+ from))
+ (while (and (< from to)
+ (setq glyph (lgstring-glyph gstring from)))
+ (lglyph-set-from-to glyph from-pos to-pos)
+ (let ((xoff (if (<= (lglyph-rbearing glyph) 0) 0
+ (- (lglyph-width glyph)))))
+ (lglyph-set-adjustment glyph xoff 0 0))
+ (setq from (1+ from)))
+ gstring))
+
+(defun compose-glyph-string-relative (gstring from to &optional gap)
+ (let ((font-object (lgstring-font gstring))
+ (glyph (lgstring-glyph gstring from))
+ from-pos to-pos
+ ascent descent lbearing rbearing)
+ (if gap
+ (setq gap (floor (* (font-get font-object :size) gap)))
+ (setq gap 0))
+ (setq from-pos (lglyph-from glyph)
+ to-pos (lglyph-to (lgstring-glyph gstring (1- to)))
+ ascent (lglyph-ascent glyph)
+ descent (lglyph-descent glyph))
+ (lglyph-set-from-to glyph from-pos to-pos)
+ (setq from (1+ from))
+ (while (< from to)
+ (setq glyph (lgstring-glyph gstring from))
+ (lglyph-set-from-to glyph from-pos to-pos)
+ (let ((this-ascent (lglyph-ascent glyph))
+ (this-descent (lglyph-descent glyph))
+ xoff yoff wadjust)
+ (setq xoff (if (<= (lglyph-rbearing glyph) 0) 0
+ (- (lglyph-width glyph))))
+ (if (> this-ascent 0)
+ (if (< this-descent 0)
+ (setq yoff (- 0 ascent gap this-descent)
+ ascent (+ ascent gap this-ascent this-descent))
+ (setq yoff 0))
+ (setq yoff (+ descent gap this-ascent)
+ descent (+ descent gap this-ascent this-descent)))
+ (if (or (/= xoff 0) (/= yoff 0))
+ (lglyph-set-adjustment glyph xoff yoff 0)))
+ (setq from (1+ from)))
+ gstring))
+
+(defun compose-gstring-for-graphic (gstring)
+ "Compose glyph-string GSTRING for graphic display.
+Non-spacing characters are composed with the preceding base
+character. If the preceding character is not a base character,
+each non-spacing character is composed as a spacing character by
+a padding space before and/or after the character.
+
+All non-spacing characters has this function in
+`composition-function-table' unless overwritten."
+ (let* ((header (lgstring-header gstring))
+ (nchars (lgstring-char-len gstring))
+ (nglyphs (lgstring-glyph-len gstring))
+ (glyph (lgstring-glyph gstring 0)))
+ (cond
+ ;; A non-spacing character not following a proper base character.
+ ((= nchars 1)
+ (let ((lbearing (lglyph-lbearing glyph))
+ (rbearing (lglyph-rbearing glyph))
+ (width (lglyph-width glyph))
+ xoff wadjust)
+ (if (< lbearing 0)
+ (setq xoff (- lbearing))
+ (setq xoff 0 lbearing 0))
+ (if (< rbearing width)
+ (setq rbearing width))
+ (lglyph-set-adjustment glyph xoff 0 (- rbearing lbearing))
+ gstring))
+
+ ;; This sequence doesn't start with a proper base character.
+ ((memq (get-char-code-property (lgstring-char gstring 0)
+ 'general-category)
+ '(Mn Mc Me Zs Zl Zp Cc Cf Cs))
+ nil)
+
+ ;; A base character and the following non-spacing characters.
+ (t
+ (let ((gstr (font-shape-gstring gstring)))
+ (if (and gstr
+ (> (lglyph-to (lgstring-glyph gstr 0)) 0))
+ gstr
+ ;; The shaper of the font couldn't shape the gstring.
+ ;; Shape them according to canonical-combining-class.
+ (lgstring-set-id gstring nil)
+ (let* ((width (lglyph-width glyph))
+ (ascent (lglyph-ascent glyph))
+ (descent (lglyph-descent glyph))
+ (rbearing (lglyph-rbearing glyph))
+ (lbearing (lglyph-lbearing glyph))
+ (center (/ (+ lbearing rbearing) 2))
+ (gap (round (* (font-get (lgstring-font gstring) :size) 0.1)))
+ xoff yoff)
+ (dotimes (i nchars)
+ (setq glyph (lgstring-glyph gstring i))
+ (when (> i 0)
+ (let* ((class (get-char-code-property
+ (lglyph-char glyph) 'canonical-combining-class))
+ (lb (lglyph-lbearing glyph))
+ (rb (lglyph-rbearing glyph))
+ (as (lglyph-ascent glyph))
+ (de (lglyph-descent glyph))
+ (ce (/ (+ lb rb) 2))
+ xoff yoff)
+ (when (and class (>= class 200) (<= class 240))
+ (setq xoff 0 yoff 0)
+ (cond
+ ((= class 200)
+ (setq xoff (- lbearing ce)
+ yoff (if (> as 0) 0 (+ descent as))))
+ ((= class 202)
+ (if (> as 0) (setq as 0))
+ (setq xoff (- center ce)
+ yoff (if (> as 0) 0 (+ descent as))))
+ ((= class 204)
+ (if (> as 0) (setq as 0))
+ (setq xoff (- rbearing ce)
+ yoff (if (> as 0) 0 (+ descent as))))
+ ((= class 208)
+ (setq xoff (- lbearing rb)))
+ ((= class 210)
+ (setq xoff (- rbearing lb)))
+ ((= class 212)
+ (setq xoff (- lbearing ce)
+ yoff (if (>= de 0) 0 (- (- ascent) de))))
+ ((= class 214)
+ (setq xoff (- center ce)
+ yoff (if (>= de 0) 0 (- (- ascent) de))))
+ ((= class 216)
+ (setq xoff (- rbearing ce)
+ yoff (if (>= de 0) 0 (- (- ascent) de))))
+ ((= class 218)
+ (setq xoff (- lbearing ce)
+ yoff (if (> as 0) 0 (+ descent as gap))))
+ ((= class 220)
+ (setq xoff (- center ce)
+ yoff (if (> as 0) 0 (+ descent as gap))))
+ ((= class 222)
+ (setq xoff (- rbearing ce)
+ yoff (if (> as 0) 0 (+ descent as gap))))
+ ((= class 224)
+ (setq xoff (- lbearing rb)))
+ ((= class 226)
+ (setq xoff (- rbearing lb)))
+ ((= class 228)
+ (setq xoff (- lbearing ce)
+ yoff (if (>= de 0) 0 (- (- ascent) de gap))))
+ ((= class 230)
+ (setq xoff (- center ce)
+ yoff (if (>= de 0) 0 (- (- ascent) de gap))))
+ ((= class 232)
+ (setq xoff (- rbearing ce)
+ yoff (if (>= de 0) 0 (- (+ ascent de) gap)))))
+ (lglyph-set-adjustment glyph (- xoff width) yoff)
+ (setq lb (+ lb xoff)
+ rb (+ lb xoff)
+ as (- as yoff)
+ de (+ de yoff)))
+ (if (< ascent as)
+ (setq ascent as))
+ (if (< descent de)
+ (setq descent de))))))
+ (let ((i 0))
+ (while (and (< i nglyphs) (setq glyph (lgstring-glyph gstring i)))
+ (lglyph-set-from-to glyph 0 (1- nchars))
+ (setq i (1+ i))))
+ gstring))))))
+
+(let ((elt `([,(purecopy "\\c.\\c^+") 1 compose-gstring-for-graphic]
+ [nil 0 compose-gstring-for-graphic])))
+ (map-char-table
+ #'(lambda (key val)
+ (if (= val 0)
+ (set-char-table-range composition-function-table key elt)))
+ char-width-table))
+
+(defun compose-gstring-for-terminal (gstring)
+ "Compose glyph string GSTRING for terminal display.
+Non-spacing characters are composed with the preceding base
+character. If the preceding character is not a base character,
+each non-spacing character is composed as a spacing character by
+a prepending a space before it."
+ (let* ((header (lgstring-header gstring))
+ (nchars (lgstring-char-len gstring))
+ (nglyphs (lgstring-glyph-len gstring))
+ (i 0)
+ (coding (lgstring-font gstring))
+ glyph)
+ (while (and (< i nglyphs)
+ (setq glyph (lgstring-glyph gstring i)))
+ (if (not (char-charset (lglyph-char glyph) coding))
+ (progn
+ ;; As the terminal doesn't support this glyph, return a
+ ;; gstring in which each glyph is its own graphme-cluster
+ ;; of width 1..
+ (setq i 0)
+ (while (and (< i nglyphs)
+ (setq glyph (lgstring-glyph gstring i)))
+ (if (< (lglyph-width glyph) 1)
+ (lglyph-set-width glyph 1))
+ (lglyph-set-from-to glyph i i)
+ (setq i (1+ i))))
+ (if (= (lglyph-width glyph) 0)
+ (if (eq (get-char-code-property (lglyph-char glyph)
+ 'general-category)
+ 'Cf)
+ (progn
+ ;; Compose by replacing with a space.
+ (lglyph-set-char glyph 32)
+ (lglyph-set-width glyph 1)
+ (setq i (1+ i)))
+ ;; Compose by prepending a space.
+ (setq gstring (lgstring-insert-glyph gstring i
+ (lglyph-copy glyph))
+ nglyphs (lgstring-glyph-len gstring))
+ (setq glyph (lgstring-glyph gstring i))
+ (lglyph-set-char glyph 32)
+ (lglyph-set-width glyph 1)
+ (setq i (+ 2)))
+ (let ((from (lglyph-from glyph))
+ (to (lglyph-to glyph))
+ (j (1+ i)))
+ (while (and (< j nglyphs)
+ (setq glyph (lgstring-glyph gstring j))
+ (char-charset (lglyph-char glyph) coding)
+ (= (lglyph-width glyph) 0))
+ (setq to (lglyph-to glyph)
+ j (1+ j)))
+ (while (< i j)
+ (setq glyph (lgstring-glyph gstring i))
+ (lglyph-set-from-to glyph from to)
+ (setq i (1+ i)))))))
+ gstring))
+
+
+(defun auto-compose-chars (func from to font-object string)
+ "Compose the characters at FROM by FUNC.
+FUNC is called with one argument GSTRING which is built for characters
+in the region FROM (inclusive) and TO (exclusive).
+
+If the character are composed on a graphic display, FONT-OBJECT
+is a font to use. Otherwise, FONT-OBJECT is nil, and the function
+`compose-gstring-for-terminal' is used instead of FUNC.
+
+If STRING is non-nil, it is a string, and FROM and TO are indices
+into the string. In that case, compose characters in the string.
+
+The value is a gstring containing information for shaping the characters.
This function is the default value of `auto-composition-function' (which see)."
- (save-buffer-state nil
- (save-excursion
- (save-match-data
- (condition-case nil
- (let ((start pos)
- (limit (if string (length string) (point-max)))
- (table (if (display-graphic-p)
- composition-function-table
- terminal-composition-function-table))
- auto-compose-current-font
- ch func newpos)
- (setq limit
- (or (text-property-any (1+ pos) limit 'auto-composed t
- string)
- limit)
- pos
- (catch 'tag
- (if string
- (while (< pos limit)
- (setq ch (aref string pos))
- (if (= ch ?\n)
- (throw 'tag (1+ pos)))
- (setq func (aref table ch))
- (if (and (functionp func)
- (setq auto-compose-current-font
- (and window
- (font-at pos window string)))
- (setq newpos (funcall func pos string))
- (> newpos pos))
- (setq pos newpos)
- (setq pos (1+ pos))))
- (while (< pos limit)
- (setq ch (char-after pos))
- (if (= ch ?\n)
- (throw 'tag (1+ pos)))
- (setq func (aref table ch))
- (if (and (functionp func)
- (setq auto-compose-current-font
- (and window (font-at pos window)))
- (setq newpos (funcall func pos string))
- (> newpos pos))
- (setq pos newpos)
- (setq pos (1+ pos)))))
- limit))
- (put-text-property start pos 'auto-composed t string))
- (error nil))))))
+ (let ((gstring (composition-get-gstring from to font-object string)))
+ (if (lgstring-shaped-p gstring)
+ gstring
+ (or (fontp font-object 'font-object)
+ (setq func 'compose-gstring-for-terminal))
+ (funcall func gstring))))
(make-variable-buffer-local 'auto-composition-function)
;;;###autoload
(define-minor-mode auto-composition-mode
- "Toggle Auto Compostion mode.
-With arg, turn Auto Compostion mode off if and only if arg is a non-positive
-number; if arg is nil, toggle Auto Compostion mode; anything else turns Auto
-Compostion on.
+ "Toggle Auto Composition mode.
+With ARG, turn Auto Composition mode off if and only if ARG is a non-positive
+number; if ARG is nil, toggle Auto Composition mode; anything else turns Auto
+Composition on.
When Auto Composition is enabled, text characters are automatically composed
by functions registered in `composition-function-table' (which see).
-You can use Global Auto Composition mode to automagically turn on
+You can use `global-auto-composition-mode' to turn on
Auto Composition mode in all buffers (this is the default)."
nil nil nil
(if noninteractive
(setq auto-composition-mode nil))
(cond (auto-composition-mode
- (add-hook 'after-change-functions 'auto-composition-after-change nil t)
(setq auto-composition-function 'auto-compose-chars))
(t
- (remove-hook 'after-change-functions 'auto-composition-after-change t)
- (setq auto-composition-function nil)))
- (save-buffer-state nil
- (save-restriction
- (widen)
- (remove-text-properties (point-min) (point-max) '(auto-composed nil))
- (decompose-region (point-min) (point-max)))))
-
-(defun auto-composition-after-change (start end old-len)
- (save-buffer-state nil
- (if (< start (point-min))
- (setq start (point-min)))
- (if (> end (point-max))
- (setq end (point-max)))
- (when (and auto-composition-mode (not memory-full))
- (let (func1 func2)
- (when (and (> start (point-min))
- (setq func2 (aref composition-function-table
- (char-after (1- start))))
- (or (= start (point-max))
- (not (setq func1 (aref composition-function-table
- (char-after start))))
- (eq func1 func2)))
- (setq start (1- start)
- func1 func2)
- (while (eq func1 func2)
- (if (> start (point-min))
- (setq start (1- start)
- func2 (aref composition-function-table
- (char-after start)))
- (setq func2 nil))))
- (when (and (< end (point-max))
- (setq func2 (aref composition-function-table
- (char-after end)))
- (or (= end (point-min))
- (not (setq func1 (aref composition-function-table
- (char-after (1- end)))))
- (eq func1 func2)))
- (setq end (1+ end)
- func1 func2)
- (while (eq func1 func2)
- (if (< end (point-max))
- (setq func2 (aref composition-function-table
- (char-after end))
- end (1+ end))
- (setq func2 nil))))
- (if (< start end)
- (remove-text-properties start end '(auto-composed nil)))))))
+ (setq auto-composition-function nil))))
(defun turn-on-auto-composition-if-enabled ()
(if enable-multibyte-characters
;;;###autoload
(define-global-minor-mode global-auto-composition-mode
auto-composition-mode turn-on-auto-composition-if-enabled
- :extra-args (dummy)
- :initialize 'custom-initialize-safe-default
+ ;; This :extra-args' appears to be the result of a naive copy&paste
+ ;; from global-font-lock-mode.
+ ;; :extra-args (dummy)
+ :initialize 'custom-initialize-delay
:init-value (not noninteractive)
:group 'auto-composition
:version "23.1")
-(defun toggle-auto-composition (&optional arg)
- "Change whether automatic character composition is enabled in this buffer.
-With arg, enable it iff arg is positive."
- (interactive "P")
- (let ((enable (if (null arg) (not auto-composition-function)
- (> (prefix-numeric-value arg) 0))))
- (if enable
- (kill-local-variable 'auto-composition-function)
- (make-local-variable 'auto-composition-function)
- (setq auto-composition-function nil)
- (save-buffer-state nil
- (save-restriction
- (widen)
- (decompose-region (point-min) (point-max)))))
-
- (save-buffer-state nil
- (save-restriction
- (widen)
- (remove-text-properties (point-min) (point-max)
- '(auto-composed nil))))))
-
-(defun auto-compose-region (from to)
- "Force automatic character composition on the region FROM and TO."
- (save-excursion
- (if (get-text-property from 'auto-composed)
- (setq from (next-single-property-change from 'auto-composed nil to)))
- (goto-char from)
- (let ((modified-p (buffer-modified-p))
- (inhibit-read-only '(composition auto-composed))
- (stop (next-single-property-change (point) 'auto-composed nil to)))
- (while (< (point) to)
- (if (= (point) stop)
- (progn
- (goto-char (next-single-property-change (point)
- 'auto-composed nil to))
- (setq stop (next-single-property-change (point)
- 'auto-composed nil to)))
- (let ((func (aref composition-function-table (following-char)))
- (pos (point)))
- (if (functionp func)
- (goto-char (funcall func (point) nil)))
- (if (<= (point) pos)
- (forward-char 1)))))
- (put-text-property from to 'auto-composed t)
- (set-buffer-modified-p modified-p))))
+(defalias 'toggle-auto-composition 'auto-composition-mode)
\f
;; The following codes are only for backward compatibility with Emacs
HCoop / bpt / emacs.git / blobdiff