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+;;; x-symbol-macs.el --- macros used when compiling or interpreting x-symbol.el
+
+;; Copyright (C) 1998-2002 Free Software Foundation, Inc.
+;;
+;; Author: Christoph Wedler <wedler@users.sourceforge.net>
+;; Maintainer: (Please use `M-x x-symbol-package-bug' to contact the maintainer)
+;; Version: 4.4
+;; Keywords: WYSIWYG, LaTeX, HTML, wp, math, internationalization
+;; X-URL: http://x-symbol.sourceforge.net/
+
+;; This program 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.
+;;
+;; This program 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 this program; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; If you want to use package x-symbol, please visit the URL (use
+;; \\[x-symbol-package-web]) and read the info (use \\[x-symbol-package-info]).
+
+;; Macro expansion must not dependent on Mule vs no-Mule!  Depending on Emacs
+;; vs XEmacs is OK, since the elc files aren't compatible anyway.
+
+;;; Code:
+
+(provide 'x-symbol-macs)
+(require 'cl)
+
+
+;;;===========================================================================
+;;;  
+;;;===========================================================================
+
+(defmacro x-symbol-ignore-property-changes (&rest body)
+  (if (featurep 'xemacs)
+      (cons 'progn body)
+    (let ((modified (gensym "--x-symbol-modified--")))
+      `(let ((,modified (buffer-modified-p))
+	     (buffer-undo-list t)
+	     (inhibit-read-only t)
+	     (inhibit-modification-hooks t)
+	     (inhibit-point-motion-hooks t))
+	 (unwind-protect
+	     (progn ,@body)
+	   (and (not ,modified) (buffer-modified-p)
+		(set-buffer-modified-p nil)))))))
+
+
+;;;===========================================================================
+;;;  Function used by macros and the macros
+;;;===========================================================================
+
+(defun x-symbol-set/push-assq/assoc (x key alist pushp test)
+  (let* ((temp (gensym "--x-symbol-set/push-assq/assoc-temp--"))
+	 (evalp (and (consp key) (null (eq (car key) 'quote))))
+	 (keysymb (if evalp
+		      (gensym "--x-symbol-set/push-assq/assoc-temp--")
+		    key))
+	 (keydef (and evalp (list (list keysymb key)))))
+    `(let* (,@keydef
+	    (,temp (,test ,keysymb ,alist)))
+       (if ,temp
+	   (setcdr ,temp ,(if pushp `(cons ,x (cdr ,temp)) x))
+	 (setq ,alist (cons (,(if pushp 'list 'cons) ,keysymb ,x) ,alist)))
+       ,temp)))
+
+(defmacro x-symbol-set-assq (x key alist)
+  "Set X to be the association for KEY in ALIST.
+If no car of an element in ALIST is `eq' to KEY, inserts (KEY . X) at
+the head of ALIST."
+  (x-symbol-set/push-assq/assoc x key alist nil 'assq))
+
+(defmacro x-symbol-set-assoc (x key alist)
+  "Set X to be the association for KEY in ALIST.
+If no car of an element in ALIST is `equal' to KEY, inserts (KEY . X) at
+the head of ALIST."
+  (x-symbol-set/push-assq/assoc x key alist nil 'assoc))
+
+(defmacro x-symbol-push-assq (x key alist)
+  "Insert X at the head of the association for KEY in ALIST.
+If no car of an element in ALIST is `eq' to KEY, inserts (KEY X) at the
+head of ALIST.  An element (KEY A B) would look like (KEY X A B) after
+the operation."
+  (x-symbol-set/push-assq/assoc x key alist t 'assq))
+
+(defmacro x-symbol-push-assoc (x key alist)
+  "Insert X at the head of the association for KEY in ALIST.
+If no car of an element in ALIST is `equal' to KEY, inserts (KEY X) at
+the head of ALIST.  An element (KEY A B) would look like (KEY X A B)
+after the operation."
+  (x-symbol-set/push-assq/assoc x key alist t 'assoc))
+
+
+;;;===========================================================================
+;;;  Macros
+;;;===========================================================================
+
+(defmacro x-symbol-dolist-delaying (spec cond &rest body)
+  ;; checkdoc-params: (spec)
+  "Loop over a list delaying elements if condition yields non-nil.
+The macro looks like
+  (x-symbol-dolist-delaying (VAR LIST [WORKING [DELAYED]]) COND BODY...)
+Bind VAR to each `car' from LIST, in turn.  If COND yields nil, evaluate
+BODY.  Otherwise, BODY with VAR bound to the list value is evaluated
+after all other list values have been processed.  Return all list
+values which could not been processed.
+
+The looping is done in cycles.  In each cycle, the value of WORKING,
+which defaults to some internal symbol, is the list of elements still to
+be processed during the current cycle.  VAR is always the head of
+WORKING.  If COND yields non-nil, VAR is inserted at the head of the
+list stored in DELAYED which defaults to some internal symbol.  At the
+end of each CYCLE, WORKING is set to the reversed value of DELAYED.  The
+macro ends if all elements has been processed or all elements in a cycle
+has been inserted into the delayed list."
+  (let ((working (or (nth 2 spec)
+		     (gensym "--x-symbol-dolist-delaying-temp--")))
+	(delayed (or (nth 3 spec)
+		     (gensym "--x-symbol-dolist-delaying-temp--")))
+	(non-circ (gensym "--x-symbol-dolist-delaying-temp--")))
+    `(block nil
+       (let ((,working ,(nth 1 spec))
+	     (,non-circ t)
+	     ,delayed
+	     ,(car spec))
+	 (while (and ,working ,non-circ)
+	   (setq ,delayed nil
+		 ,non-circ nil)
+	   (while ,working
+	     (setq ,(car spec) (car ,working))
+	     (if ,cond
+		 (setq ,delayed (cons ,(car spec) ,delayed))
+	       ,@body
+	       (setq ,non-circ t))
+	     (setq ,working (cdr ,working)))
+	   (setq ,working (nreverse ,delayed)))
+	 ,working))))
+
+(defmacro x-symbol-do-plist (spec &rest body)
+  ;; checkdoc-params: (spec)
+  "Loop over a property list.
+The macro looks like
+  (x-symbol-do-plist (PROP VAR PLIST) BODY...)
+Evaluate BODY with each PROP bound to each property of PLIST and VAR
+bound to the corresponding value, in turn.  PROP and VAR can also be nil
+if their value is not important.  Return nil."
+  (let ((plist (gensym "--x-symbol-do-plist-temp--")))
+    `(block nil
+       (let ((,plist ,(nth 2 spec))
+	     ,@(and (car spec) (list (car spec)))
+	     ,@(and (nth 1 spec) (list (nth 1 spec))))
+	 (while ,plist
+	   (setq ,@(and (car spec) `(,(car spec) (car ,plist)))
+		 ,@(and (nth 1 spec) `(,(nth 1 spec) (cadr ,plist))))
+	   ,@body
+	   (setq ,plist (cddr ,plist)))
+	 nil))))
+
+(defmacro x-symbol-while-charsym (spec &rest body)
+  "(x-symbol-while-charsym (CHARSYM CHAR) BODY...)"
+  (unless (and (consp spec)
+	       (symbolp (car spec))
+	       (symbolp (cadr spec))
+	       (null (cddr spec)))
+    (error "Wrong call of `x-symbol-while-charsym'."))
+  (let ((charsym (car spec))
+	(char (cadr spec)))
+    `(let (,charsym ,char)
+       (block nil
+	 (skip-chars-forward "\000-\177")
+	 (while (setq ,char (char-after))
+	   (if (setq ,charsym
+		     ,(if (featurep 'xemacs)
+			  '(x-symbol-encode-charsym-after)
+			;; no need for nomule byte-comp in Emacs => inline
+			`(get-char-table ,char x-symbol-mule-char-table)))
+	       (progn ,@body)
+	     (forward-char x-symbol-encode-rchars))
+	   (skip-chars-forward "\000-\177"))))))
+
+(defmacro x-symbol-encode-for-charsym (spec &rest body)
+  "(x-symbol-while-charsym ((TOKEN-TABLE FCHAR-TABLE FCHAR-FALLBACK-TABLE) TOKEN CHARSYM)) BODY...)"
+  (let* ((tables (car spec))
+	 (vars (cdr spec))
+	 (fchar-table (cadr tables))
+	 (fchar-fb-table (caddr tables))
+	 (token (car vars))
+	 (charsym (or (cadr vars)
+		      (gensym "--x-symbol-encode-for-charsym-temp--")))
+	 (char (gensym "--x-symbol-encode-for-charsym-temp--"))
+	 (fchar (gensym "--x-symbol-encode-for-charsym-temp--")))
+    `(let (,fchar ,token)
+       (x-symbol-while-charsym ,(list charsym char)
+	 (cond ((and ,fchar-table
+		     (setq ,fchar (gethash ,charsym ,fchar-table)))
+		;; fchar-fb-table = nil => no recoding
+		(if (or (null ,fchar-fb-table) (eq ,fchar ,char))
+		    (forward-char x-symbol-encode-rchars)
+		  (insert ,fchar)
+		  (delete-char x-symbol-encode-rchars)))
+	       ((setq ,token (gethash ,charsym ,(car tables)))
+		,@body)
+	       ((setq ,fchar (gethash ,charsym ,fchar-fb-table))
+		(if (eq ,fchar ,char)
+		    (forward-char x-symbol-encode-rchars)
+		  (insert ,fchar)
+		  (delete-char x-symbol-encode-rchars)))
+	       (t
+		(forward-char x-symbol-encode-rchars)))))))
+
+(defmacro x-symbol-decode-for-charsym (spec undefined &rest body)
+  "(x-symbol-decode-for-charsym ((REGEXP DECODE-OBARRAY CASE-FN) DEFN BEG END) UNDEFINED BODY...)"
+  (let* ((grammar (car spec))
+	 (case-fn (caddar spec))
+	 (defn (cadr spec))
+	 (beg (caddr spec))
+	 (end (cadddr spec)))
+    `(let (,beg ,end ,defn)
+       (block nil
+	 (while (re-search-forward ,(car grammar) nil t)
+	   (setq ,beg (match-beginning 0)
+		 ,end (match-end 0))
+	   (if (setq ,defn (intern-soft
+			    ,(if case-fn
+				 `(if ,case-fn
+				      (funcall ,case-fn
+					       (buffer-substring ,beg ,end))
+				    (buffer-substring ,beg ,end))
+			       `(buffer-substring ,beg ,end))
+			    ,(cadr grammar)))
+	       (progn
+		 (setq ,defn (symbol-value ,defn)) ; nil shouldn't happen
+		 ,@body)
+	     ,@(if undefined (list undefined))))))))
+
+(defmacro x-symbol-decode-unique-test (token-spec unique)
+  `(and ,unique
+	(or (cddr ,token-spec)
+	    (and (hash-table-p ,unique)
+		 (gethash (car ,token-spec) ,unique)))))
+
+(defmacro x-symbol-set-buffer-multibyte ()
+  ;; Make sure the buffer is not in unibyte mode (for Emacs).
+  (unless (featurep 'xemacs)
+    '(set-buffer-multibyte t)))
+
+;;; Local IspellPersDict: .ispell_xsymb
+;;; x-symbol-macs.el ends here