--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/mule/mule-misc.el	Mon Aug 13 09:02:59 2007 +0200
@@ -0,0 +1,258 @@
+;;; mule-misc.el --- Miscellaneous Mule functions.
+
+;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Amdahl Corporation.
+;; Copyright (C) 1995 Sun Microsystems.
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the 
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;;
+;;;  protect specified local variables from kill-all-local-variables
+;;;
+
+(defvar self-insert-after-hook nil
+  "Hook to run when extended self insertion command exits.  Should take
+two arguments START and END corresponding to character position.")
+
+(make-variable-buffer-local 'self-insert-after-hook)
+
+(defun toggle-display-direction ()
+  (interactive)
+  (setq display-direction (not display-direction))
+  (if (interactive-p) (redraw-display)))
+
+;;;
+;;; Utility functions for Mule
+;;;
+
+;(defun string-to-char-list (str)
+;  (let ((len (length str))
+;	(idx 0)
+;	c l)
+;    (while (< idx len)
+;      (setq c (sref str idx))
+;      (setq idx (+ idx (charset-dimension (char-charset c))))
+;      (setq l (cons c l)))
+;    (nreverse l)))
+
+(defun string-to-char-list (str)
+  (mapcar 'identity str))
+
+;;; Slower, albeit more elegant, implementation??
+;; (defun string-columns (string)
+;;  "Return number of columns STRING occupies when displayed.
+;; Uses the charset-columns attribute of the characters in STRING,
+;; which may not accurately represent the actual display width in a
+;; window system."
+;;  (loop for c across string
+;;     sum (charset-columns (char-charset c))))
+
+(defun string-columns (string)
+  "Return number of columns STRING occupies when displayed.
+Uses the charset-columns attribute of the characters in STRING,
+which may not accurately represent the actual display width when
+using a window system."
+  (let ((col 0)
+	(len (length string))
+	(i 0))
+    (while (< i len)
+      (setq col (+ col (charset-columns (char-charset (aref string i)))))
+      (setq i (1+ i)))
+    col))
+
+(defalias 'string-width 'string-columns)
+
+(defun delete-text-in-column (from to)
+  "Delete the text between column FROM and TO (exclusive) of the current line.
+Nil of FORM or TO means the current column.
+If there's a charcter across the borders, the character is replaced with
+the same width of spaces before deleting."
+  (save-excursion
+    (let (p1 p2)
+      (if from
+	  (progn
+	    (setq p1 (move-to-column from))
+	    (if (> p1 from)
+		(progn
+		  (delete-char -1)
+		  (insert-char ?  (- p1 (current-column)))
+		  (forward-char (- from p1))))))
+      (setq p1 (point))
+      (if to
+	  (progn
+	    (setq p2 (move-to-column to))
+	    (if (> p2 to)
+		(progn
+		  (delete-char -1)
+		  (insert-char ?  (- p2 (current-column)))
+		  (forward-char (- to p2))))))
+      (setq p2 (point))
+      (delete-region p1 p2))))
+
+;; #### Someone translate this!!
+
+(defun mc-normal-form-string (str)
+  "文字列 STR の漢字標準形文字列を返す．"
+  (let ((i 0))
+    (while (setq i (string-match "\n" str i))
+      (if (and (<= 1 i) (< i (1- (length str)))
+	       (< (aref str (1- i)) 128)
+	       (< (aref str (1+ i)) 128))
+	  (aset str i ? ))
+      (setq i (1+ i)))
+    (if (string-match "\n" str 0)
+	(let ((c 0) (i 0) new)
+	  (while (setq i (string-match "\n" str i))
+	    (setq i (1+ i))
+	    (setq c (1+ c)))
+	  (setq new (make-string (- (length str) c) 0))
+	  (setq i 0 c 0)
+	  (while (< i (length str))
+	    (cond((not (= (aref str i) ?\n ))
+		  (aset new c (aref str i))
+		  (setq c (1+ c))))
+
+	    (setq i (1+ i))
+	    )
+	  new)
+      str)))
+
+
+(defun string-memq (str list)
+  "Returns non-nil if STR is an element of LIST.  Comparison done with string=.
+The value is actually the tail of LIST whose car is STR.
+If each element of LIST is not a string, it is converted to string
+ before comparison."
+  (let (find elm)
+    (while (and (not find) list)
+      (setq elm (car list))
+      (if (numberp elm) (setq elm (char-to-string elm)))
+      (if (string= str elm)
+	  (setq find list)
+	(setq list (cdr list))))
+    find))
+
+(defun cancel-undo-boundary ()
+  "Cancel undo boundary."
+  (if (and (consp buffer-undo-list)
+	   ;; if car is nil.
+	   (null (car buffer-undo-list)) )
+      (setq buffer-undo-list (cdr buffer-undo-list)) ))
+
+;;; Common API emulation functions for GNU Emacs-merged Mule.
+;;; As suggested by MORIOKA Tomohiko
+(defun truncate-string (str width &optional start-column)
+  "Truncate STR to fit in WIDTH columns.
+Optional non-nil arg START-COLUMN specifies the starting column."
+  (substring str (or start-column 0) width))
+
+(defalias 'sref 'aref)
+(defalias 'map-char-concat 'mapcar)
+(defun char-bytes (chr) 1)
+(defun char-length (chr) 1)
+
+(defun char-columns (character)
+  "Return number of columns a CHARACTER occupies when displayed."
+  (charset-columns (char-charset character)))
+
+(defalias 'charset-description 'charset-doc-string)
+
+(defalias 'find-charset-string 'charsets-in-string)
+(defalias 'find-charset-region 'charsets-in-region)
+
+(defun find-non-ascii-charset-string (string)
+  "Return a list of charsets in the STRING except ascii.
+For compatibility with Mule"
+  (delq 'ascii (charsets-in-string string)))
+
+(defun find-non-ascii-charset-region (start end)
+  "Return a list of charsets except ascii
+in the region between START and END.
+For compatibility with Mule"
+  (delq 'ascii (charsets-in-region start end)))
+
+;(defun truncate-string-to-column (str width &optional start-column)
+;  "Truncate STR to fit in WIDTH columns.
+;Optional non-nil arg START-COLUMN specifies the starting column."
+;  (or start-column
+;      (setq start-column 0))
+;  (let ((max-width (string-width str))
+;	(len (length str))
+;	(from 0)
+;	(column 0)
+;	to-prev to ch)
+;    (if (>= width max-width)
+;	(setq width max-width))
+;    (if (>= start-column width)
+;	""
+;      (while (< column start-column)
+;	(setq ch (aref str from)
+;	      column (+ column (char-width ch))
+;	      from (+ from (char-octets ch))))
+;      (if (< width max-width)
+;	  (progn
+;	    (setq to from)
+;	    (while (<= column width)
+;	      (setq ch (aref str to)
+;		    column (+ column (char-width ch))
+;		    to-prev to
+;		    to (+ to (char-octets ch))))
+;	    (setq to to-prev)))
+;      (substring str from to))))
+
+
+;;; Language environments
+
+(defvar current-language-environment nil)
+
+(defvar language-environment-list nil)
+
+(defun current-language-environment ()
+  "Return the current language environment as a symbol.
+Returns nil if `set-language-environment' has not been called."
+  current-language-environment)
+
+(defun language-environment-list ()
+  "Return a list of all currently defined language environments."
+  language-environment-list)
+
+(defun language-environment-p (sym)
+  "True if SYM names a defined language environment."
+  (memq sym (language-environment-list)))
+
+(defun set-language-environment (env)
+  "Set the current language environment to ENV."
+  (interactive
+   (list (intern (completing-read "Language environment: "
+				  obarray 'language-environment-p
+				  'require-match))))
+  (when (not (string= (charset-registry 'ascii) "ISO8859-1"))
+    (set-charset-registry 'ascii "ISO8859-1"))
+  (let ((func (get env 'set-lang-environ)))
+    (if (not (null func))
+	(funcall func)))
+  (setq current-language-environment env))
+
+(defun define-language-environment (env-sym doc-string enable-function)
+  "Define a new language environment, named by ENV-SYM.
+DOC-STRING should be a string describing the environment.
+ENABLE-FUNCTION should be a function of no arguments that will be called
+when the language environment is made current."
+  (put env-sym 'lang-environ-doc-string doc-string)
+  (put env-sym 'set-lang-environ enable-function)
+  (setq language-environment-list (cons env-sym language-environment-list)))