--- gforth/gforth.el	1995/01/12 18:37:53	1.9
+++ gforth/gforth.el	2010/07/04 10:08:40	1.78
@@ -1,11 +1,10 @@
-;; This file is part of GNU Emacs.
-;; Changes by anton
-;; This is a variant of forth.el that came with TILE.
-;; I left most of this stuff untouched and made just a few changes for 
-;; the things I use (mainly indentation and syntax tables).
-;; So there is still a lot of work to do to adapt this to gforth.
+;;; gforth.el --- major mode for editing (G)Forth sources
 
-;; GNU Emacs is distributed in the hope that it will be useful,
+;; Copyright (C) 1995,1996,1997,1998,2000,2001,2003,2004,2007,2008 Free Software Foundation, Inc.
+
+;; This file is part of Gforth.
+
+;; GForth is distributed in the hope that it will be useful,
 ;; but WITHOUT ANY WARRANTY.  No author or distributor
 ;; accepts responsibility to anyone for the consequences of using it
 ;; or for whether it serves any particular purpose or works at all,
@@ -15,13 +14,29 @@
 ;; Everyone is granted permission to copy, modify and redistribute
 ;; GNU Emacs, but only under the conditions described in the
 ;; GNU Emacs General Public License.   A copy of this license is
-;; supposed to have been given to you along with GNU Emacs so you
+;; supposed to have been given to you along with Gforth so you
 ;; can know your rights and responsibilities.  It should be in a
 ;; file named COPYING.  Among other things, the copyright notice
 ;; and this notice must be preserved on all copies.
 
-;;; $Header: /nfs/unsafe/cvs-repository/src-master/gforth/gforth.el,v 1.9 1995/01/12 18:37:53 anton Exp $
+;; Author: Goran Rydqvist <gorry@ida.liu.se>
+;; Maintainer: David Kühling <dvdkhlng@gmx.de>
+;; Created: 16 July 88 by Goran Rydqvist
+;; Keywords: forth, gforth
+
+;; Changes by anton
+;; This is a variant of forth.el that came with TILE.
+;; I left most of this stuff untouched and made just a few changes for 
+;; the things I use (mainly indentation and syntax tables).
+;; So there is still a lot of work to do to adapt this to gforth.
+
+;; Changes by David
+;; Added a syntax-hilighting engine, rewrote auto-indentation engine.
+;; Added support for block files.
+;; Replaced forth-process code with comint-based implementation.
 
+;; Tested with Emacs 19.34, 20.5, 21 and XEmacs 21
+ 
 ;;-------------------------------------------------------------------
 ;; A Forth indentation, documentation search and interaction library
 ;;-------------------------------------------------------------------
@@ -35,26 +50,1043 @@
 ;; Documentation: See forth-mode (^HF forth-mode)
 ;;-------------------------------------------------------------------
 
+;;; Code:
+
+;(setq debug-on-error t)
+
+;; Code ripped from `version.el' for compatability with Emacs versions
+;; prior to 19.23.
+(if (not (boundp 'emacs-major-version))
+    (defconst emacs-major-version
+      (progn (string-match "^[0-9]+" emacs-version)
+	     (string-to-number (match-string 0 emacs-version)))))
+
+;; Code ripped from `subr.el' for compatability with Emacs versions
+;; prior to 20.1
+(eval-when-compile 
+(defun forth-emacs-older (major minor)
+  (or (< emacs-major-version major)
+      (and (= emacs-major-version major) (< emacs-minor-version minor))))
+
+  (if (forth-emacs-older 20 1)
+      (progn
+	(defmacro when (cond &rest body)
+	  "If COND yields non-nil, do BODY, else return nil."
+	  (list 'if cond (cons 'progn body)))
+	(defmacro unless (cond &rest body)
+	  "If COND yields nil, do BODY, else return nil."
+	  (cons 'if (cons cond (cons nil body)))))))
+
+;; `no-error' argument of require not supported in Emacs versions
+;; prior to 20.4 :-(
+(eval-and-compile
+(defun forth-require (feature)
+    (condition-case err (require feature) (error nil))))
+
+(require 'font-lock)
+
+;; define `font-lock-warning-face' in emacs-versions prior to 20.1
+;; (ripped from `font-lock.el')
+(unless (boundp 'font-lock-warning-face)
+  (message "defining font-lock-warning-face")
+  (make-face 'font-lock-warning-face)
+  (defvar font-lock-warning-face 'font-lock-warning-face)
+  (set-face-foreground font-lock-warning-face "red")
+  (make-face-bold font-lock-warning-face))
+
+;; define `font-lock-constant-face' in XEmacs (just copy
+;; `font-lock-preprocessor-face')
+(unless (boundp 'font-lock-constant-face)
+  (copy-face font-lock-preprocessor-face 'font-lock-constant-face))
+
+
+;; define `regexp-opt' in emacs versions prior to 20.1 
+;; (this implementation is extremely inefficient, though)
+(eval-and-compile (forth-require 'regexp-opt))
+(unless (memq 'regexp-opt features)
+  (message (concat 
+	    "Warning: your Emacs version doesn't support `regexp-opt'. "
+            "Hilighting will be slow."))
+  (defun regexp-opt (STRINGS &optional PAREN)
+    (let ((open (if PAREN "\\(" "")) (close (if PAREN "\\)" "")))
+      (concat open (mapconcat 'regexp-quote STRINGS "\\|") close)))
+  (defun regexp-opt-depth (re)
+    (if (string= (substring re 0 2) "\\(") 1 0)))
+
+; todo:
+;
+
+; screen-height existiert nicht in XEmacs, frame-height ersetzen?
+; 
+
+; Wörter ordentlich hilighten, die nicht auf Whitespace beginnen ( ..)IF
+; -- mit aktueller Konzeption nicht möglich??
+;
+; Konfiguration über customization groups
+;
+; Bereich nur auf Wortanfang/ende ausweiten, wenn Anfang bzw Ende in einem 
+; Wort liegen (?) -- speed!
+;
+; 'forth-word' property muss eindeutig sein!
+;
+; Forth-Menu 
+;
+; Interface zu GForth Prozessen (Patches von Michael Scholz)
+;
+; Byte-compile-Code rausschmeißen, Compilieren im Makefile über Emacs
+; batch-Modus
+;
+; forth-help Kram rausschmeißen
+;
+; XEmacs Kompatibilität? imenu/speedbar -> fume?
+; 
+; Folding neuschreiben (neue Parser-Informationen benutzen)
+
+;;; Motion-hooking (dk)
+;;;
+(defun forth-idle-function ()
+  "Function that is called when Emacs is idle to detect cursor motion
+in forth-block-mode buffers (which is mainly used for screen number
+display in).  Currently ignores forth-mode buffers but that may change
+in the future."
+  (if (eq major-mode 'forth-block-mode)
+      (forth-check-motion)))
+
+(defvar forth-idle-function-timer nil 
+  "Timer that runs `forth-idle-function' or nil if no timer installed.")
+
+(defun forth-install-motion-hook ()
+  "Install the motion-hooking mechanism.  Currently uses idle timers
+but might be transparently changed in the future."
+  (unless forth-idle-function-timer
+    ;; install idle function only once (first time forth-mode is used)
+    (setq forth-idle-function-timer 
+	  (run-with-idle-timer .05 t 'forth-idle-function))))
+
+(defvar forth-was-point nil)
+
+(defun forth-check-motion ()
+  "Run `forth-motion-hooks', if `point' changed since last call.  This
+used to be called via `post-command-hook' but uses idle timers now as
+users complaint about lagging performance."
+  (when (or (eq forth-was-point nil) (/= forth-was-point (point)))
+    (setq forth-was-point (point))
+    (run-hooks 'forth-motion-hooks)))
+
+
+;;; Hilighting and indentation engine (dk)
+;;;
+(defvar forth-disable-parser nil
+  "*Non-nil means to disable on-the-fly parsing of Forth-code.
+
+This will disable hilighting of forth-mode buffers and will decrease
+the smartness of the indentation engine. Only set it to non-nil, if
+your computer is very slow. To disable hilighting, set
+`forth-hilight-level' to zero.")
+
+(defvar forth-jit-parser nil
+  "*Non-nil means to parse Forth-code just-in-time.
+
+This eliminates the need for initially parsing forth-mode buffers and
+thus speeds up loading of Forth files. That feature is only available
+in Emacs21 (and newer versions).")
+
+(defvar forth-words nil 
+  "List of words for hilighting and recognition of parsed text areas. 
+
+Hilighting of object-oriented Forth code is achieved, by appending either
+`forth-objects-words' or `forth-oof-words' to the list, depending on the values of `forth-use-objects' or `forth-use-oof'.
+
+After `forth-words' changed, `forth-compile-words' must be called to
+make the changes take effect.
+
+Each item of `forth-words' has the form 
+   (MATCHER TYPE HILIGHT . &optional PARSED-TEXT ...)
+
+MATCHER is either a list of strings to match, or a REGEXP.
+   If it's a REGEXP, it should not be surrounded by '\\<' or '\\>', since 
+   that'll be done automatically by the search routines.
+
+TYPE should be one of 'definiton-starter', 'definition-ender', 'compile-only',
+   'immediate' or 'non-immediate'. Those information are required to determine
+   whether a word actually parses (and whether that parsed text needs to be
+   hilighted).
+
+HILIGHT is a cons cell of the form (FACE . MINIMUM-LEVEL)
+   Where MINIMUM-LEVEL specifies the minimum value of `forth-hilight-level',
+   that's required for matching text to be hilighted.
+
+PARSED-TEXT specifies whether and how a word parses following text. You can
+   specify as many subsequent PARSED-TEXT as you wish, but that shouldn't be
+   necessary very often. It has the following form:
+   (DELIM-REGEXP SKIP-LEADING-FLAG PARSED-TYPE HILIGHT)
+
+DELIM-REGEXP is a regular expression that should match strings of length 1,
+   which are delimiters for the parsed text.
+
+A non-nil value for PARSE-LEADING-FLAG means, that leading delimiter strings
+   before parsed text should be skipped. This is the parsing behaviour of the
+   Forth word WORD. Set it to t for name-parsing words, nil for comments and
+   strings.
+
+PARSED-TYPE specifies what kind of text is parsed. It should be on of 'name',
+   'string' or 'comment'.")
+(setq forth-words
+      '(
+	(("[") definition-ender (font-lock-keyword-face . 1))
+	(("]" "]l") definition-starter (font-lock-keyword-face . 1))
+	((":") definition-starter (font-lock-keyword-face . 1)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("immediate" "compile-only" "restrict")
+	 immediate (font-lock-keyword-face . 1))
+	(("does>") compile-only (font-lock-keyword-face . 1))
+	((":noname") definition-starter (font-lock-keyword-face . 1))
+	((";" ";code") definition-ender (font-lock-keyword-face . 1))
+	(("include" "require" "needs" "use") 
+	 non-immediate (font-lock-keyword-face . 1) 
+	 "[\n\t ]" t string (font-lock-string-face . 1))
+	(("included" "required" "thru" "load")
+	 non-immediate (font-lock-keyword-face . 1))
+	(("code" "abi-code")
+	 non-immediate (font-lock-keyword-face . 1)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("end-code")
+	 non-immediate (font-lock-keyword-face . 1))
+	(("[char]") compile-only (font-lock-keyword-face . 1)
+	 "[ \t\n]" t string (font-lock-string-face . 1))
+	(("char") non-immediate (font-lock-keyword-face . 1)
+	 "[ \t\n]" t string (font-lock-string-face . 1))
+	(("s\"" "c\"") immediate (font-lock-string-face . 1)
+	 "[\"\n]" nil string (font-lock-string-face . 1))
+	((".\"") compile-only (font-lock-string-face . 1)
+	 "[\"\n]" nil string (font-lock-string-face . 1))
+	(("abort\"") compile-only (font-lock-keyword-face . 1)
+	 "[\"\n]" nil string (font-lock-string-face . 1))
+	(("{") compile-only (font-lock-variable-name-face . 1)
+	 "[\n}]" nil name (font-lock-variable-name-face . 1))
+	((".(" "(") immediate (font-lock-comment-face . 1)
+	  ")" nil comment (font-lock-comment-face . 1))
+	(("\\" "\\G") immediate (font-lock-comment-face . 1)
+	 "[\n]" nil comment (font-lock-comment-face . 1))
+	  
+	(("[if]" "[?do]" "[do]" "[for]" "[begin]" 
+	  "[endif]" "[then]" "[loop]" "[+loop]" "[next]" "[until]" "[repeat]"
+	  "[again]" "[while]" "[else]")
+	 immediate (font-lock-keyword-face . 2))
+	(("[ifdef]" "[ifundef]") immediate (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("if" "begin" "ahead" "do" "?do" "+do" "u+do" "-do" "u-do" "for" 
+	  "case" "of" "?dup-if" "?dup-0=-if" "then" "endif" "until"
+	  "repeat" "again" "leave" "?leave"
+	  "loop" "+loop" "-loop" "next" "endcase" "endof" "else" "while" "try"
+	  "recover" "endtry" "iferror" "restore" "endtry-iferror"
+	  "assert(" "assert0(" "assert1(" "assert2("
+	  "assert3(" ")" "<interpretation" "<compilation" "interpretation>" 
+	  "compilation>")
+	 compile-only (font-lock-keyword-face . 2))
+
+	(("true" "false" "c/l" "bl" "cell" "pi" "w/o" "r/o" "r/w") 
+	 non-immediate (font-lock-constant-face . 2))
+	(("~~" "break:" "dbg") compile-only (font-lock-warning-face . 2))
+	(("break\"") compile-only (font-lock-warning-face . 1)
+	 "[\"\n]" nil string (font-lock-string-face . 1))
+	(("postpone" "[is]" "defers" "[']" "[compile]") 
+	 compile-only (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("is" "what's") immediate (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("<is>" "'" "see") non-immediate (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("[to]") compile-only (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-variable-name-face . 3))
+	(("to") immediate (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-variable-name-face . 3))
+	(("<to>") non-immediate (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-variable-name-face . 3))
+
+	(("create" "variable" "constant" "2variable" "2constant" "fvariable"
+	  "fconstant" "value" "field" "user" "vocabulary" 
+	  "create-interpret/compile")
+	 non-immediate (font-lock-type-face . 2)
+	 "[ \t\n]" t name (font-lock-variable-name-face . 3))
+	("\\S-+%" non-immediate (font-lock-type-face . 2))
+	(("defer" "alias" "create-interpret/compile:") 
+	 non-immediate (font-lock-type-face . 1)
+	 "[ \t\n]" t name (font-lock-function-name-face . 3))
+	(("end-struct") non-immediate (font-lock-keyword-face . 2)
+	 "[ \t\n]" t name (font-lock-type-face . 3))
+	(("struct") non-immediate (font-lock-keyword-face . 2))
+	("-?[0-9]+\\(\\.[0-9]*e\\(-?[0-9]+\\)?\\|\\.?[0-9a-f]*\\)" 
+	 immediate (font-lock-constant-face . 3))
+	("-?\\([&#][0-9]+\\|\\(0x\\|\\$\\)[0-9a-f]+\\|%[01]+\\)"
+	 immediate (font-lock-constant-face . 3))
+	))
+
+(defvar forth-use-objects nil 
+  "*Non-nil makes forth-mode also hilight words from the \"Objects\" package.")
+(defvar forth-objects-words
+  '(((":m") definition-starter (font-lock-keyword-face . 1)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("m:") definition-starter (font-lock-keyword-face . 1))
+    ((";m") definition-ender (font-lock-keyword-face . 1))
+    (("[current]" "[parent]") compile-only (font-lock-keyword-face . 1)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("current" "overrides") non-immediate (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("[to-inst]") compile-only (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-variable-name-face . 3))
+    (("[bind]") compile-only (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-type-face . 3)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("bind") non-immediate (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-type-face . 3)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("inst-var" "inst-value") non-immediate (font-lock-type-face . 2)
+     "[ \t\n]" t name (font-lock-variable-name-face . 3))
+    (("method" "selector")
+     non-immediate (font-lock-type-face . 1)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("end-class" "end-interface")
+     non-immediate (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-type-face . 3))
+    (("public" "protected" "class" "exitm" "implementation" "interface"
+      "methods" "end-methods" "this") 
+     non-immediate (font-lock-keyword-face . 2))
+    (("object") non-immediate (font-lock-type-face . 2)))
+  "Hilighting description for words of the \"Objects\" package")
+
+
+(defvar forth-use-oof nil 
+  "*Non-nil makes forth-mode also hilight words from the \"OOF\" package.")
+(defvar forth-oof-words 
+  '((("class") non-immediate (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-type-face . 3))
+    (("var") non-immediate (font-lock-type-face . 2)
+     "[ \t\n]" t name (font-lock-variable-name-face . 3))
+    (("method" "early") non-immediate (font-lock-type-face . 2)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("::" "super" "bind" "bound" "link") 
+     immediate (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-function-name-face . 3))
+    (("ptr" "asptr" "[]") 
+     immediate (font-lock-keyword-face . 2)
+     "[ \t\n]" t name (font-lock-variable-name-face . 3))
+    (("class;" "how:" "self" "new" "new[]" "definitions" "class?" "with"
+      "endwith")
+     non-immediate (font-lock-keyword-face . 2))
+    (("object") non-immediate (font-lock-type-face . 2)))
+  "Hilighting description for words of the \"OOF\" package")
+
+(defvar forth-local-words nil 
+  "List of Forth words to prepend to `forth-words'. Should be set by a 
+ forth source, using a local variables list at the end of the file 
+ (\"Local Variables: ... forth-local-words: ... End:\" construct).") 
+
+(defvar forth-custom-words nil
+  "List of Forth words to prepend to `forth-words'. Should be set in your
+ .emacs.")
+
+(defvar forth-hilight-level 3 "*Level of hilighting of Forth code.")
+
+(defvar forth-compiled-words nil "Compiled representation of `forth-words'.")
+
+(defvar forth-indent-words nil 
+  "List of words that have indentation behaviour.
+Each element of `forth-indent-words' should have the form
+   (MATCHER INDENT1 INDENT2 &optional TYPE) 
+  
+MATCHER is either a list of strings to match, or a REGEXP.
+   If it's a REGEXP, it should not be surrounded by `\\<` or `\\>`, since 
+   that'll be done automatically by the search routines.
+
+TYPE might be omitted. If it's specified, the only allowed value is 
+   currently the symbol `non-immediate', meaning that the word will not 
+   have any effect on indentation inside definitions. (:NONAME is a good 
+   example for this kind of word).
+
+INDENT1 specifies how to indent a word that's located at the beginning
+   of a line, following any number of whitespaces.
+
+INDENT2 specifies how to indent words that are not located at the
+   beginning of a line.
+
+INDENT1 and INDENT2 are indentation specifications of the form
+   (SELF-INDENT . NEXT-INDENT), where SELF-INDENT is a numerical value, 
+   specifying how the matching line and all following lines are to be 
+   indented, relative to previous lines. NEXT-INDENT specifies how to indent 
+   following lines, relative to the matching line.
+  
+   Even values of SELF-INDENT and NEXT-INDENT correspond to multiples of
+   `forth-indent-level'. Odd values get an additional 
+   `forth-minor-indent-level' added/substracted. Eg a value of -2 indents
+   1 * forth-indent-level  to the left, wheras 3 indents 
+   1 * forth-indent-level + forth-minor-indent-level  columns to the right.")
+
+(setq forth-indent-words
+      '((("if" "begin" "do" "?do" "+do" "-do" "u+do"
+	  "u-do" "?dup-if" "?dup-0=-if" "case" "of" "try" "iferror"
+	  "[if]" "[ifdef]" "[ifundef]" "[begin]" "[for]" "[do]" "[?do]")
+	 (0 . 2) (0 . 2))
+	((":" ":noname" "code" "abi-code" "struct" "m:" ":m" "class" 
+	  "interface")
+	 (0 . 2) (0 . 2) non-immediate)
+	("\\S-+%$" (0 . 2) (0 . 0) non-immediate)
+	((";" ";m") (-2 . 0) (0 . -2))
+	(("again" "then" "endif" "endtry" "endcase" "endof" 
+	  "[then]" "[endif]" "[loop]" "[+loop]" "[next]" 
+	  "[until]" "[again]" "loop")
+	 (-2 . 0) (0 . -2))
+	(("end-code" "end-class" "end-interface" "end-class-noname" 
+	  "end-interface-noname" "end-struct" "class;")
+	 (-2 . 0) (0 . -2) non-immediate)
+	(("protected" "public" "how:") (-1 . 1) (0 . 0) non-immediate)
+	(("+loop" "-loop" "until") (-2 . 0) (-2 . 0))
+	(("else" "recover" "restore" "endtry-iferror" "[else]")
+	 (-2 . 2) (0 . 0))
+	(("does>") (-1 . 1) (0 . 0))
+	(("while" "[while]") (-2 . 4) (0 . 2))
+	(("repeat" "[repeat]") (-4 . 0) (0 . -4))))
+
+(defvar forth-local-indent-words nil 
+  "List of Forth words to prepend to `forth-indent-words', when a forth-mode
+buffer is created. Should be set by a Forth source, using a local variables 
+list at the end of the file (\"Local Variables: ... forth-local-words: ... 
+End:\" construct).")
+
+(defvar forth-custom-indent-words nil
+  "List of Forth words to prepend to `forth-indent-words'. Should be set in
+ your .emacs.")
+
+(defvar forth-indent-level 4
+  "*Indentation of Forth statements.")
+(defvar forth-minor-indent-level 2
+  "*Minor indentation of Forth statements.")
+(defvar forth-compiled-indent-words nil)
+
+;(setq debug-on-error t)
+
+;; Filter list by predicate. This is a somewhat standard function for 
+;; functional programming languages. So why isn't it already implemented 
+;; in Lisp??
+(defun forth-filter (predicate list)
+  (let ((filtered nil))
+    (dolist (item list)
+	      (when (funcall predicate item)
+		(if filtered
+		    (nconc filtered (list item))
+          (setq filtered (cons item nil)))))
+    filtered))
+
+;; Helper function for `forth-compile-word': return whether word has to be
+;; added to the compiled word list, for syntactic parsing and hilighting.
+(defun forth-words-filter (word)
+  (let* ((hilight (nth 2 word))
+	 (level (cdr hilight))
+	 (parsing-flag (nth 3 word)))
+    (or parsing-flag 
+	(<= level forth-hilight-level))))
+
+;; Helper function for `forth-compile-word': translate one entry from 
+;; `forth-words' into the form  (regexp regexp-depth word-description)
+(defun forth-compile-words-mapper (word)
+  ;; warning: we cannot rely on regexp-opt's PAREN argument, since
+  ;; XEmacs will use shy parens by default :-(
+  (let* ((matcher (car word))
+	 (regexp 
+	  (concat "\\(" (cond ((stringp matcher) matcher)
+			      ((listp matcher) (regexp-opt matcher))
+			      (t (error "Invalid matcher")))
+		  "\\)"))
+	 (depth (regexp-opt-depth regexp))
+	 (description (cdr word)))
+    (list regexp depth description)))
+
+;; Read `words' and create a compiled representation suitable for efficient
+;; parsing of the form  
+;; (regexp (subexp-count word-description) (subexp-count2 word-description2)
+;;  ...)
+(defun forth-compile-wordlist (words)
+  (let* ((mapped (mapcar 'forth-compile-words-mapper words))
+	 (regexp (concat "\\<\\(" 
+			 (mapconcat 'car mapped "\\|")
+			 "\\)\\>"))
+	 (sub-count 2)
+	 (sub-list (mapcar 
+		    (lambda (i) 
+		      (let ((sub (cons sub-count (nth 2 i))))
+			(setq sub-count (+ sub-count (nth 1 i)))
+			sub 
+			)) 
+		    mapped)))
+    (let ((result (cons regexp sub-list)))
+      (byte-compile 'result)
+      result)))
+
+(defun forth-compile-words ()
+  "Compile the the words from `forth-words' and `forth-indent-words' into
+ the format that's later used for doing the actual hilighting/indentation.
+ Store the resulting compiled wordlists in `forth-compiled-words' and 
+`forth-compiled-indent-words', respective"
+  (setq forth-compiled-words 
+	(forth-compile-wordlist 
+	 (forth-filter 'forth-words-filter forth-words)))
+  (setq forth-compiled-indent-words 
+	(forth-compile-wordlist forth-indent-words)))
+
+(defun forth-hack-local-variables ()
+  "Parse and bind local variables, set in the contents of the current 
+ forth-mode buffer. Prepend `forth-local-words' to `forth-words' and 
+ `forth-local-indent-words' to `forth-indent-words'."
+  (put 'forth-local-indent-words 'safe-local-variable 'listp)
+  (put 'forth-local-words 'safe-local-variable 'listp)
+  (hack-local-variables)
+  (setq forth-words (append forth-local-words forth-words))
+  (setq forth-indent-words (append forth-local-indent-words 
+				   forth-indent-words)))
+
+(defun forth-customize-words ()
+  "Add the words from `forth-custom-words' and `forth-custom-indent-words'
+ to `forth-words' and `forth-indent-words', respective. Add 
+ `forth-objects-words' and/or `forth-oof-words' to `forth-words', if
+ `forth-use-objects' and/or `forth-use-oof', respective is set."
+  (setq forth-words (append forth-custom-words forth-words
+			    (if forth-use-oof forth-oof-words nil)
+			    (if forth-use-objects forth-objects-words nil)))
+  (setq forth-indent-words (append 
+			    forth-custom-indent-words forth-indent-words)))
+
+
+
+;; get location of first character of previous forth word that's got 
+;; properties
+(defun forth-previous-start (pos)
+  (let* ((word (get-text-property pos 'forth-word))
+	 (prev (previous-single-property-change 
+		(min (point-max) (1+ pos)) 'forth-word 
+		(current-buffer) (point-min))))
+    (if (or (= (point-min) prev) word) prev
+      (if (get-text-property (1- prev) 'forth-word)
+	  (previous-single-property-change 
+	   prev 'forth-word (current-buffer) (point-min))
+	(point-min)))))
+
+;; Get location of the last character of the current/next forth word that's
+;; got properties, text that's parsed by the word is considered as parts of 
+;; the word.
+(defun forth-next-end (pos)
+  (let* ((word (get-text-property pos 'forth-word))
+	 (next (next-single-property-change pos 'forth-word 
+					    (current-buffer) (point-max))))
+    (if word next
+      (if (get-text-property next 'forth-word)
+	  (next-single-property-change 
+	   next 'forth-word (current-buffer) (point-max))
+	(point-max)))))
+
+(defun forth-next-whitespace (pos)
+  (save-excursion
+    (goto-char pos)
+    (skip-syntax-forward "-" (point-max))
+    (point)))
+(defun forth-previous-word (pos)
+  (save-excursion
+    (goto-char pos)
+    (re-search-backward "\\<" pos (point-min) 1)
+    (point)))
+
+;; Delete all properties, used by Forth mode, from `from' to `to'.
+(defun forth-delete-properties (from to)
+  (remove-text-properties 
+   from to '(face nil fontified nil 
+		  forth-parsed nil forth-word nil forth-state nil)))
+
+;; Get the index of the branch of the most recently evaluated regular 
+;; expression that matched. (used for identifying branches "a\\|b\\|c...")
+(defun forth-get-regexp-branch ()
+  (let ((count 2))
+    (while (not (condition-case err (match-beginning count)
+		  (args-out-of-range t)))  ; XEmacs requires error handling
+      (setq count (1+ count)))
+    count))
+
+;; seek to next forth-word and return its "word-description"
+(defun forth-next-known-forth-word (to)
+  (if (<= (point) to)
+      (progn
+	(let* ((regexp (car forth-compiled-words))
+	       (pos (re-search-forward regexp to t)))
+	  (if pos (let ((branch (forth-get-regexp-branch))
+			(descr (cdr forth-compiled-words)))
+		    (goto-char (match-beginning 0))
+		    (cdr (assoc branch descr)))
+	    'nil)))
+    nil))
+
+;; Set properties of forth word at `point', eventually parsing subsequent 
+;; words, and parsing all whitespaces. Set point to delimiter after word.
+;; The word, including it's parsed text gets the `forth-word' property, whose 
+;; value is unique, and may be used for getting the word's start/end 
+;; positions.
+(defun forth-set-word-properties (state data)
+  (let* ((start (point))
+	 (end (progn (re-search-forward "[ \t]\\|$" (point-max) 1)
+		     (point)))
+	 (type (car data))
+	 (hilight (nth 1 data))
+	 (bad-word (and (not state) (eq type 'compile-only)))
+	 (hlface (if bad-word font-lock-warning-face
+		   (if (<= (cdr hilight) forth-hilight-level)
+		       (car hilight) nil))))
+    (when hlface (put-text-property start end 'face hlface))
+    ;; if word parses in current state, process parsed range of text
+    (when (or (not state) (eq type 'compile-only) (eq type 'immediate))
+      (let ((parse-data (nthcdr 2 data)))
+	(while parse-data
+	  (let ((delim (nth 0 parse-data))
+		(skip-leading (nth 1 parse-data))
+		(parse-type (nth 2 parse-data))
+		(parsed-hilight (nth 3 parse-data))
+		(parse-start (point))
+		(parse-end))
+	    (when skip-leading
+	      (while (and (looking-at delim) (> (match-end 0) (point))
+			  (not (looking-at "\n")))
+		(forward-char)))
+	    (re-search-forward delim (point-max) 1)
+	    (setq parse-end (point))
+	    (forth-delete-properties end parse-end)
+	    (when (<= (cdr parsed-hilight) forth-hilight-level)
+	      (put-text-property 
+	       parse-start parse-end 'face (car parsed-hilight)))
+	    (put-text-property 
+	     parse-start parse-end 'forth-parsed parse-type)
+	    (setq end parse-end)
+	    (setq parse-data (nthcdr 4 parse-data))))))
+    (put-text-property start end 'forth-word start)))
+
+;; Search for known Forth words in the range `from' to `to', using 
+;; `forth-next-known-forth-word' and set their properties via 
+;; `forth-set-word-properties'.
+(defun forth-update-properties (from to &optional loudly)
+  (save-excursion
+    (let ((msg-count 0) (state) (word-descr) (last-location))
+      (goto-char (forth-previous-word (forth-previous-start 
+				       (max (point-min) (1- from)))))
+      (setq to (forth-next-end (min (point-max) (1+ to))))
+      ;; `to' must be on a space delimiter, if a parsing word was changed
+      (setq to (forth-next-whitespace to))
+      (setq state (get-text-property (point) 'forth-state))
+      (setq last-location (point))
+      (forth-delete-properties (point) to)
+      (put-text-property (point) to 'fontified t)
+      ;; hilight loop...
+      (while (setq word-descr (forth-next-known-forth-word to))
+	(when loudly
+	  (when (equal 0 (% msg-count 100))
+	    (message "Parsing Forth code...%s"
+		     (make-string (/ msg-count 100) ?.)))
+	  (setq msg-count (1+ msg-count)))
+	(forth-set-word-properties state word-descr)
+	(when state (put-text-property last-location (point) 'forth-state t))
+	(let ((type (car word-descr)))
+	  (if (eq type 'definition-starter) (setq state t))
+	  (if (eq type 'definition-ender) (setq state nil))
+	  (setq last-location (point))))
+      ;; update state property up to `to'
+      (if (and state (< (point) to))
+	  (put-text-property last-location to 'forth-state t))
+      ;; extend search if following state properties differ from current state
+      (if (< to (point-max))
+	  (if (not (equal state (get-text-property (1+ to) 'forth-state)))
+	      (let ((extend-to (next-single-property-change 
+				to 'forth-state (current-buffer) (point-max))))
+		(forth-update-properties to extend-to))
+	    ))
+      )))
+
+;; save-buffer-state borrowed from `font-lock.el'
+(eval-when-compile 
+  (defmacro forth-save-buffer-state (varlist &rest body)
+    "Bind variables according to VARLIST and eval BODY restoring buffer state."
+    `(let* (,@(append varlist
+		   '((modified (buffer-modified-p)) (buffer-undo-list t)
+		     (inhibit-read-only t) (inhibit-point-motion-hooks t)
+		     before-change-functions after-change-functions
+                        deactivate-mark buffer-file-name buffer-file-truename)))
+       ,@body
+	 (when (and (not modified) (buffer-modified-p))
+         (set-buffer-modified-p nil)))))
+
+;; Function that is added to the `change-functions' hook. Calls 
+;; `forth-update-properties' and keeps care of disabling undo information
+;; and stuff like that.
+(defun forth-change-function (from to len &optional loudly)
+  (save-match-data
+    (forth-save-buffer-state 
+     () 
+     (unless forth-disable-parser (forth-update-properties from to loudly))
+     (forth-update-warn-long-lines))))
+
+(defun forth-fontification-function (from)
+  "Function to be called from `fontification-functions' of Emacs 21."
+  (save-match-data
+    (forth-save-buffer-state
+     ((to (min (point-max) (+ from 100))))
+     (unless (or forth-disable-parser (not forth-jit-parser)
+		 (get-text-property from 'fontified))
+       (forth-update-properties from to)))))
+
+(eval-when-compile
+  (byte-compile 'forth-set-word-properties)
+  (byte-compile 'forth-next-known-forth-word)
+  (byte-compile 'forth-update-properties)
+  (byte-compile 'forth-delete-properties)
+  (byte-compile 'forth-get-regexp-branch)) 
+
+;;; imenu support
+;;;
+(defvar forth-defining-words 
+  '("VARIABLE" "CONSTANT" "2VARIABLE" "2CONSTANT" "FVARIABLE" "FCONSTANT"
+   "USER" "VALUE" "field" "end-struct" "VOCABULARY" "CREATE" ":" "CODE"
+   "DEFER" "ALIAS")
+  "List of words, that define the following word.
+Used for imenu index generation.")
+
+(defvar forth-defining-words-regexp nil 
+  "Regexp that's generated for matching `forth-defining-words'")
+ 
+(defun forth-next-definition-starter ()
+  (progn
+    (let* ((pos (re-search-forward forth-defining-words-regexp (point-max) t)))
+      (if pos
+	  (if (or (text-property-not-all (match-beginning 0) (match-end 0) 
+					 'forth-parsed nil)
+		  (text-property-not-all (match-beginning 0) (match-end 0)
+					 'forth-state nil)) 
+	      (forth-next-definition-starter)
+	    t)
+	nil))))
+
+(defun forth-create-index ()
+  (let* ((forth-defining-words-regexp 
+	  (concat "\\<\\(" (regexp-opt forth-defining-words) "\\)\\>"))
+	 (index nil))
+    (goto-char (point-min))
+    (while (forth-next-definition-starter)
+      (if (looking-at "[ \t]*\\([^ \t\n]+\\)")
+	  (setq index (cons (cons (match-string 1) (point)) index))))
+    index))
+
+;; top-level require is executed at byte-compile and load time
+(eval-and-compile (forth-require 'speedbar))
+
+;; this code is executed at load-time only
+(when (memq 'speedbar features)
+  (speedbar-add-supported-extension ".fs")
+  (speedbar-add-supported-extension ".fb"))
+
+;; (require 'profile)
+;; (setq profile-functions-list '(forth-set-word-properties forth-next-known-forth-word forth-update-properties forth-delete-properties forth-get-regexp-branch))
+
+;;; Indentation
+;;;
+
+;; Return, whether `pos' is the first forth word on its line
+(defun forth-first-word-on-line-p (pos)
+  (save-excursion
+    (beginning-of-line)
+    (skip-chars-forward " \t")
+    (= pos (point))))
+
+;; Return indentation data (SELF-INDENT . NEXT-INDENT) of next known 
+;; indentation word, or nil if there is no word up to `to'. 
+;; Position `point' at location just after found word, or at `to'. Parsed 
+;; ranges of text will not be taken into consideration!
+(defun forth-next-known-indent-word (to)
+  (if (<= (point) to)
+      (progn
+	(let* ((regexp (car forth-compiled-indent-words))
+	       (pos (re-search-forward regexp to t)))
+	  (if pos
+	      (let* ((start (match-beginning 0))
+		     (end (match-end 0))
+		     (branch (forth-get-regexp-branch))
+		     (descr (cdr forth-compiled-indent-words))
+		     (indent (cdr (assoc branch descr)))
+		     (type (nth 2 indent)))
+		;; skip words that are parsed (strings/comments) and 
+		;; non-immediate words inside definitions
+		(if (or (text-property-not-all start end 'forth-parsed nil)
+			(and (eq type 'non-immediate) 
+			     (text-property-not-all start end 
+						    'forth-state nil)))
+		    (forth-next-known-indent-word to)
+		  (if (forth-first-word-on-line-p (match-beginning 0))
+		      (nth 0 indent) (nth 1 indent))))
+	    nil)))
+    nil))
+  
+;; Translate indentation value `indent' to indentation column. Multiples of
+;; 2 correspond to multiples of `forth-indent-level'. Odd numbers get an
+;; additional `forth-minor-indent-level' added (or substracted).
+(defun forth-convert-to-column (indent)
+  (let* ((sign (if (< indent 0) -1 1))
+	 (value (abs indent))
+	 (major (* (/ value 2) forth-indent-level))
+	 (minor (* (% value 2) forth-minor-indent-level)))
+    (* sign (+ major minor))))
+
+;; Return the column increment, that the current line of forth code does to
+;; the current or following lines. `which' specifies which indentation values
+;; to use. 1 means the indentation of following lines relative to current 
+;; line, 0 means the indentation of the current line relative to the previous 
+;; line. Return `nil', if there are no indentation words on the current line.
+(defun forth-get-column-incr (which)
+  (save-excursion
+    (let ((regexp (car forth-compiled-indent-words))
+	  (word-indent)
+	  (self-indent nil)
+	  (next-indent nil)
+	  (to (save-excursion (end-of-line) (point))))
+      (beginning-of-line)
+      (while (setq word-indent (forth-next-known-indent-word to))
+	(let* ((self-incr (car word-indent))
+	       (next-incr (cdr word-indent))
+	       (self-column-incr (forth-convert-to-column self-incr))
+	       (next-column-incr (forth-convert-to-column next-incr)))
+	  (setq next-indent (if next-indent next-indent 0))
+	  (setq self-indent (if self-indent self-indent 0))
+	  (if (or (and (> next-indent 0) (< self-column-incr 0))
+		  (and (< next-indent 0) (> self-column-incr 0)))
+	      (setq next-indent (+ next-indent self-column-incr))
+	    (setq self-indent (+ self-indent self-column-incr)))
+	  (setq next-indent (+ next-indent next-column-incr))))
+      (nth which (list self-indent next-indent)))))
+
+;; Find previous line that contains indentation words, return the column,
+;; to which following text should be indented to.
+(defun forth-get-anchor-column ()
+  (save-excursion
+    (if (/= 0 (forward-line -1)) 0
+      (let ((indent))
+	(while (not (or (setq indent (forth-get-column-incr 1))
+			(<= (point) (point-min))))
+	  (forward-line -1))
+	(+ (current-indentation) (if indent indent 0))))))
+
+(defun forth-indent-line (&optional flag)
+  "Correct indentation of the current Forth line."
+  (let* ((anchor (forth-get-anchor-column))
+	 (column-incr (forth-get-column-incr 0)))
+    (forth-indent-to (if column-incr (+ anchor column-incr) anchor))))
+
+(defun forth-current-column ()
+  (- (point) (save-excursion (beginning-of-line) (point))))
+(defun forth-current-indentation ()
+  (- (save-excursion (beginning-of-line) (forward-to-indentation 0) (point))
+     (save-excursion (beginning-of-line) (point))))
+
+(defun forth-indent-to (x)
+  (let ((p nil))
+    (setq p (- (forth-current-column) (forth-current-indentation)))
+    (forth-delete-indentation)
+    (beginning-of-line)
+    (indent-to x)
+    (if (> p 0) (forward-char p))))
+
+(defun forth-delete-indentation ()
+  (save-excursion
+    (delete-region 
+     (progn (beginning-of-line) (point)) 
+     (progn (back-to-indentation) (point)))))
+
+(defun forth-indent-command ()
+  (interactive)
+  (forth-indent-line t))
+
+;; remove trailing whitespaces in current line
+(defun forth-remove-trailing ()
+  (save-excursion
+    (end-of-line)
+    (delete-region (point) (progn (skip-chars-backward " \t") (point)))))
+
+;; insert newline, removing any trailing whitespaces in the current line
+(defun forth-newline-remove-trailing ()
+  (save-excursion
+    (delete-region (point) (progn (skip-chars-backward " \t") (point))))
+  (newline))
+;  (let ((was-point (point-marker)))
+;    (unwind-protect 
+;	(progn (forward-line -1) (forth-remove-trailing))
+;      (goto-char (was-point)))))
+
+;; workaround for bug in `reindent-then-newline-and-indent'
+(defun forth-reindent-then-newline-and-indent ()
+  (interactive "*")
+  (indent-according-to-mode)
+  (forth-newline-remove-trailing)
+  (indent-according-to-mode))
+
+
+;;; Block file encoding/decoding  (dk)
+;;;
+
+(defconst forth-c/l 64 "Number of characters per block line")
+(defconst forth-l/b 16 "Number of lines per block")
+
+;; Check whether the unconverted block file line, point is in, does not
+;; contain `\n' and `\t' characters.
+(defun forth-check-block-line (line)
+  (let ((end (save-excursion (beginning-of-line) (forward-char forth-c/l)
+			     (point))))
+    (save-excursion 
+      (beginning-of-line)
+      (when (search-forward "\n" end t)
+	(message "Warning: line %i contains newline character #10" line)
+	(ding t))
+      (beginning-of-line)
+      (when (search-forward "\t" end t)
+	(message "Warning: line %i contains tab character #8" line)
+	(ding t)))))
+
+(defun forth-convert-from-block (from to)
+  "Convert block file format to stream source in current buffer."
+  (let ((line (count-lines (point-min) from)))
+    (save-excursion
+      (goto-char from)
+      (set-mark to)
+      (while (< (+ (point) forth-c/l) (mark t))
+	(setq line (1+ line))
+	(forth-check-block-line line)
+	(forward-char forth-c/l)
+	(forth-newline-remove-trailing))
+      (when (= (+ (point) forth-c/l) (mark t))
+	(forth-remove-trailing))
+      (mark t))))
+
+;; Pad a line of a block file up to `forth-c/l' characters, positioning `point'
+;; at the end of line.
+(defun forth-pad-block-line ()
+  (save-excursion
+    (end-of-line)
+    (if (<= (current-column) forth-c/l)
+	(move-to-column forth-c/l t)
+      (message "Line %i longer than %i characters, truncated"
+	       (count-lines (point-min) (point)) forth-c/l)
+      (ding t)
+      (move-to-column forth-c/l t)
+      (delete-region (point) (progn (end-of-line) (point))))))
+
+;; Replace tab characters in current line by spaces.
+(defun forth-convert-tabs-in-line ()
+  (save-excursion
+    (beginning-of-line)
+    (while (search-forward "\t" (save-excursion (end-of-line) (point)) t)
+      (backward-char)
+      (delete-region (point) (1+ (point)))
+      (insert-char ?\  (- tab-width (% (current-column) tab-width))))))
+
+;; Delete newline at end of current line, concatenating it with the following
+;; line. Place `point' at end of newly formed line.
+(defun forth-delete-newline ()
+  (end-of-line)
+  (delete-region (point) (progn (beginning-of-line 2) (point))))
+
+(defun forth-convert-to-block (from to &optional original-buffer) 
+  "Convert range of text to block file format in current buffer."
+  (let* ((lines 0)) ; I have to count lines myself, since `count-lines' has
+		    ; problems with trailing newlines...
+    (save-excursion
+      (goto-char from)
+      (set-mark to)
+      ;; pad lines to full length (`forth-c/l' characters per line)
+      (while (< (save-excursion (end-of-line) (point)) (mark t))
+	(setq lines (1+ lines))
+	(forth-pad-block-line)
+	(forth-convert-tabs-in-line)
+	(forward-line))
+      ;; also make sure the last line is padded, if `to' is at its end
+      (end-of-line)
+      (when (= (point) (mark t))
+	(setq lines (1+ lines))
+	(forth-pad-block-line)
+	(forth-convert-tabs-in-line))
+      ;; remove newlines between lines
+      (goto-char from)
+      (while (< (save-excursion (end-of-line) (point)) (mark t))
+	(forth-delete-newline))
+      ;; append empty lines, until last block is complete
+      (goto-char (mark t))
+      (let* ((required (* (/ (+ lines (1- forth-l/b)) forth-l/b) forth-l/b))
+	     (pad-lines (- required lines)))
+	(while (> pad-lines 0)
+	  (insert-char ?\  forth-c/l)
+	  (setq pad-lines (1- pad-lines))))
+      (point))))
+
+(defun forth-detect-block-file-p ()
+  "Return non-nil if the current buffer is in block file format. Detection is
+done by checking whether the first line has 1024 characters or more."
+  (save-restriction 
+    (widen)
+    (save-excursion
+       (goto-char (point-min))
+       (end-of-line)
+       (>= (current-column) 1024))))
+
+;; add block file conversion routines to `format-alist'
+(defconst forth-block-format-description
+  '(forth-blocks "Forth block source file" nil 
+		 forth-convert-from-block forth-convert-to-block 
+		 t normal-mode))
+(unless (memq forth-block-format-description format-alist)
+  (setq format-alist (cons forth-block-format-description format-alist)))
+
+;;; End block file encoding/decoding
+
+;;; Block file editing
+;;;
+(defvar forth-overlay-arrow-string ">>")
+(defvar forth-block-base 1 "Number of first block in block file")
+(defvar forth-show-screen nil
+  "Non-nil means to show screen starts and numbers (for block files)")
+(defvar forth-warn-long-lines nil
+  "Non-nil means to warn about lines that are longer than 64 characters")
+
+(defvar forth-screen-marker nil)
+(defvar forth-screen-number-string nil)
+
+(defun forth-update-show-screen ()
+  "If `forth-show-screen' is non-nil, put overlay arrow to start of screen, 
+`point' is in. If arrow now points to different screen than before, display 
+screen number."
+  (if (not forth-show-screen)
+      (setq overlay-arrow-string nil)
+    (save-excursion
+      (let* ((line (count-lines (point-min) (min (point-max) (1+ (point)))))
+	     (first-line (1+ (* (/ (1- line) forth-l/b) forth-l/b)))
+	     (scr (+ forth-block-base (/ first-line forth-l/b))))
+	(setq overlay-arrow-string forth-overlay-arrow-string)
+	(goto-line first-line)
+	(setq overlay-arrow-position forth-screen-marker)
+	(set-marker forth-screen-marker 
+		    (save-excursion (goto-line first-line) (point)))
+	(setq forth-screen-number-string (format "%d" scr))))))
+
+(add-hook 'forth-motion-hooks 'forth-update-show-screen)
+
+(defun forth-update-warn-long-lines ()
+  "If `forth-warn-long-lines' is non-nil, display a warning whenever a line
+exceeds 64 characters."
+  (when forth-warn-long-lines
+    (when (> (save-excursion (end-of-line) (current-column)) forth-c/l)
+      (message "Warning: current line exceeds %i characters"
+	       forth-c/l))))
+
+(add-hook 'forth-motion-hooks 'forth-update-warn-long-lines)
+
+;;; End block file editing
 
-(defvar forth-positives
-  " : :noname begin do ?do while if ?dup-if ?dup-not-if else case create does> exception> struct [if] [else] "
-  "Contains all words which will cause the indent-level to be incremented
-on the next line.
-OBS! All words in forth-positives must be surrounded by spaces.")
-
-(defvar forth-negatives
-  " ; until repeat while +loop loop s+loop else then endif again endcase does> end-struct [then] [else] "
-  "Contains all words which will cause the indent-level to be decremented
-on the current line.
-OBS! All words in forth-negatives must be surrounded by spaces.")
-
-(defvar forth-zeroes
-  " : :noname "
-  "Contains all words which causes the indent to go to zero")
-
-(defvar forth-prefixes
-  " postpone [compile] ['] [char] "
-  "words that prefix and escape other words")
 
 (defvar forth-mode-abbrev-table nil
   "Abbrev table in use in Forth-mode buffers.")
@@ -67,25 +1099,52 @@ OBS! All words in forth-negatives must b
 (if (not forth-mode-map)
     (setq forth-mode-map (make-sparse-keymap)))
 
-(global-set-key "\e\C-m" 'forth-send-paragraph)
-(global-set-key "\C-x\C-m" 'forth-split)
-(global-set-key "\e " 'forth-reload)
-
 ;(define-key forth-mode-map "\M-\C-x" 'compile)
 (define-key forth-mode-map "\C-x\\" 'comment-region)
-(define-key forth-mode-map "\C-x|" 'uncomment-region)
 (define-key forth-mode-map "\C-x~" 'forth-remove-tracers)
-(define-key forth-mode-map "\e\C-m" 'forth-send-paragraph)
-(define-key forth-mode-map "\eo" 'forth-send-buffer)
 (define-key forth-mode-map "\C-x\C-m" 'forth-split)
 (define-key forth-mode-map "\e " 'forth-reload)
 (define-key forth-mode-map "\t" 'forth-indent-command)
-(define-key forth-mode-map "\C-m" 'reindent-then-newline-and-indent)
+(define-key forth-mode-map "\C-m" 'forth-reindent-then-newline-and-indent)
 (define-key forth-mode-map "\M-q" 'forth-fill-paragraph)
+(define-key forth-mode-map "\e." 'forth-find-tag)
+
+;; setup for C-h C-i to work
+(eval-and-compile (forth-require 'info-look))
+(when (memq 'info-look features)
+  (defvar forth-info-lookup '(symbol (forth-mode "\\S-+" t 
+						  (("(gforth)Word Index"))
+						  "\\S-+")))
+  (unless (memq forth-info-lookup info-lookup-alist)
+    (setq info-lookup-alist (cons forth-info-lookup info-lookup-alist)))
+  ;; in X-Emacs C-h C-i is by default bound to Info-query
+  (define-key forth-mode-map [?\C-h ?\C-i] 'info-lookup-symbol))
+
+;;   (info-lookup-add-help
+;;    :topic 'symbol
+;;    :mode 'forth-mode
+;;    :regexp "[^ 	
+;; ]+"
+;;    :ignore-case t
+;;    :doc-spec '(("(gforth)Name Index" nil "`" "'  "))))
+
+(require 'etags)
+
+(defun forth-find-tag (tagname &optional next-p regexp-p)
+  (interactive (find-tag-interactive "Find tag: "))
+  (unless (or regexp-p next-p)
+    (setq tagname (concat "\\(^\\|\\s-+\\)\\(" (regexp-quote tagname) 
+			    "\\)\\s-*\x7f")))
+  (switch-to-buffer
+   (find-tag-noselect tagname next-p t)))
 
 (defvar forth-mode-syntax-table nil
   "Syntax table in use in Forth-mode buffers.")
 
+;; Important: hilighting/indentation now depends on a correct syntax table.
+;; All characters, except whitespace *must* belong to the "word constituent"
+;; syntax class. If different behaviour is required, use of Categories might
+;; help.
 (if (not forth-mode-syntax-table)
     (progn
       (setq forth-mode-syntax-table (make-syntax-table))
@@ -96,24 +1155,7 @@ OBS! All words in forth-negatives must b
 	(while (< char 256)
 	  (modify-syntax-entry char "w" forth-mode-syntax-table)
 	  (setq char (1+ char))))
-      (modify-syntax-entry ?\" "\"" forth-mode-syntax-table)
-      (modify-syntax-entry ?\\ "<" forth-mode-syntax-table)
-      (modify-syntax-entry ?\n ">" forth-mode-syntax-table)
       ))
-;I do not define '(' and ')' as comment delimiters, because emacs
-;only supports one comment syntax (and a hack to accomodate C++); I
-;use '\' for natural language comments and '(' for formal comments
-;like stack comments, so for me it's better to have emacs treat '\'
-;comments as comments. I you want it different, make the appropriate
-;changes (best in your .emacs file).
-;
-;Hmm, the C++ hack could be used to support both comment syntaxes: we
-;can have different comment styles, if both comments start with the
-;same character. we could use ' ' as first and '(' and '\' as second
-;character. However this would fail for G\ comments.
-
-(defconst forth-indent-level 4
-  "Indentation of Forth statements.")
 
 (defun forth-mode-variables ()
   (set-syntax-table forth-mode-syntax-table)
@@ -133,92 +1175,167 @@ OBS! All words in forth-negatives must b
   (make-local-variable 'comment-column)
   (setq comment-column 40)
   (make-local-variable 'comment-start-skip)
-  (setq comment-start-skip "\\ ")
-  (make-local-variable 'comment-indent-hook)
-  (setq comment-indent-hook 'forth-comment-indent)
+  (setq comment-start-skip "\\\\ ")
+  (make-local-variable 'comment-indent-function)
+  (setq comment-indent-function 'forth-comment-indent)
   (make-local-variable 'parse-sexp-ignore-comments)
-  (setq parse-sexp-ignore-comments t))
-  
+  (setq parse-sexp-ignore-comments t)
+  (setq case-fold-search t)
+  (make-local-variable 'forth-was-point)
+  (setq forth-was-point -1)
+  (make-local-variable 'forth-words)
+  (make-local-variable 'forth-compiled-words)
+  (make-local-variable 'forth-compiled-indent-words)
+  (make-local-variable 'forth-hilight-level)
+  (make-local-variable 'after-change-functions)
+  (make-local-variable 'forth-show-screen)
+  (make-local-variable 'forth-screen-marker)
+  (make-local-variable 'forth-warn-long-lines)
+  (make-local-variable 'forth-screen-number-string)
+  (make-local-variable 'forth-use-oof)
+  (make-local-variable 'forth-use-objects) 
+  (setq forth-screen-marker (copy-marker 0))
+  (add-hook 'after-change-functions 'forth-change-function)
+  (if (and forth-jit-parser (>= emacs-major-version 21))
+      (add-hook 'fontification-functions 'forth-fontification-function))
+  (setq imenu-create-index-function 'forth-create-index))
+
 ;;;###autoload
 (defun forth-mode ()
   "
 Major mode for editing Forth code. Tab indents for Forth code. Comments
 are delimited with \\ and newline. Paragraphs are separated by blank lines
-only. Delete converts tabs to spaces as it moves back.
+only. Block files are autodetected, when read, and converted to normal 
+stream source format. See also `forth-block-mode'.
 \\{forth-mode-map}
- Forth-split
-    Positions the current buffer on top and a forth-interaction window
-    below. The window size is controlled by the forth-percent-height
-    variable (see below).
- Forth-reload
-    Reloads the forth library and restarts the forth process.
- Forth-send-buffer
-    Sends the current buffer, in text representation, as input to the
-    forth process.
- Forth-send-paragraph
-    Sends the previous or the current paragraph to the forth-process.
-    Note that the cursor only need to be with in the paragraph to be sent.
-forth-documentation
-    Search for documentation of forward adjacent to cursor. Note! To use
-    this mode you have to add a line, to your .emacs file, defining the
-    directories to search through for documentation files (se variable
-    forth-help-load-path below) e.g. (setq forth-help-load-path '(nil)).
-
-Variables controlling interaction and startup
- forth-percent-height
-    Tells split how high to make the edit portion, in percent of the
-    current screen height.
- forth-program-name
-    Tells the library which program name to execute in the interation
-    window.
+
+Variables controlling syntax hilighting/recognition of parsed text:
+ `forth-words'
+    List of words that have a special parsing behaviour and/or should be
+    hilighted. Add custom words by setting forth-custom-words in your
+    .emacs, or by setting forth-local-words, in source-files' local 
+    variables lists.
+ forth-use-objects
+    Set this variable to non-nil in your .emacs, or in a local variables 
+    list, to hilight and recognize the words from the \"Objects\" package 
+    for object-oriented programming.
+ forth-use-oof
+    Same as above, just for the \"OOF\" package.
+ forth-custom-words
+    List of custom Forth words to prepend to `forth-words'. Should be set
+    in your .emacs.
+ forth-local-words
+    List of words to prepend to `forth-words', whenever a forth-mode
+    buffer is created. That variable should be set by Forth sources, using
+    a local variables list at the end of file, to get file-specific
+    hilighting.
+    0 [IF]
+       Local Variables: ... 
+       forth-local-words: ...
+       End:
+    [THEN]
+ forth-hilight-level
+    Controls how much syntax hilighting is done. Should be in the range 
+    0..3
 
 Variables controlling indentation style:
- forth-positives
-    A string containing all words which causes the indent-level of the
-    following line to be incremented.
-    OBS! Each word must be surronded by spaces.
- forth-negatives
-    A string containing all words which causes the indentation of the
-    current line to be decremented, if the word begin the line. These
-    words also has a cancelling effect on the indent-level of the
-    following line, independent of position.
-    OBS! Each word must be surronded by spaces.
- forth-zeroes
-    A string containing all words which causes the indentation of the
-    current line to go to zero, if the word begin the line.
-    OBS! Each word must be surronded by spaces.
+ `forth-indent-words'
+    List of words that influence indentation.
+ forth-local-indent-words
+    List of words to prepend to `forth-indent-words', similar to 
+    forth-local-words. Should be used for specifying file-specific 
+    indentation, using a local variables list.
+ forth-custom-indent-words
+    List of words to prepend to `forth-indent-words'. Should be set in your
+    .emacs.    
  forth-indent-level
     Indentation increment/decrement of Forth statements.
+ forth-minor-indent-level
+    Minor indentation increment/decrement of Forth statemens.
 
- Note! A word which decrements the indentation of the current line, may
-    also be mentioned in forth-positives to cause the indentation to
-    resume the previous level.
-
-Variables controling documentation search
- forth-help-load-path
-    List of directories to search through to find *.doc
-    (forth-help-file-suffix) files. Nil means current default directory.
-    The specified directories must contain at least one .doc file. If it
-    does not and you still want the load-path to scan that directory, create
-    an empty file dummy.doc.
- forth-help-file-suffix
-    The file names to search for in each directory specified by
-    forth-help-load-path. Defaulted to '*.doc'. 
-"
+Variables controlling block-file editing:
+ forth-show-screen
+    Non-nil means, that the start of the current screen is marked by an
+    overlay arrow, and screen numbers are displayed in the mode line.
+    This variable is by default nil for `forth-mode' and t for 
+    `forth-block-mode'.
+ forth-overlay-arrow-string
+    String to display as the overlay arrow, when `forth-show-screen' is t.
+    Setting this variable to nil disables the overlay arrow.
+ forth-block-base
+    Screen number of the first block in a block file. Defaults to 1.
+ forth-warn-long-lines
+    Non-nil means that a warning message is displayed whenever you edit or
+    move over a line that is longer than 64 characters (the maximum line
+    length that can be stored into a block file). This variable defaults to
+    t for `forth-block-mode' and to nil for `forth-mode'.
+
+Variables controlling interaction with the Forth-process (also see
+`run-forth'):
+  forth-program-name
+    Program invoked by the `run-forth' command (including arguments).
+  inferior-forth-mode-hook
+    Hook for customising inferior-forth-mode.
+  forth-compile-command
+    Default command to execute on `compile'.
+" 
   (interactive)
   (kill-all-local-variables)
   (use-local-map forth-mode-map)
   (setq mode-name "Forth")
   (setq major-mode 'forth-mode)
+  (forth-install-motion-hook)
+  ;; convert buffer contents from block file format, if necessary
+  (when (forth-detect-block-file-p)
+    (widen)
+    (message "Converting from Forth block source...")
+    (forth-convert-from-block (point-min) (point-max))
+    (message "Converting from Forth block source...done"))
+  ;; if user switched from forth-block-mode to forth-mode, make sure the file
+  ;; is now stored as normal strem source
+  (when (equal buffer-file-format '(forth-blocks))
+    (setq buffer-file-format nil))
   (forth-mode-variables)
 ;  (if (not (forth-process-running-p))
 ;      (run-forth forth-program-name))
   (run-hooks 'forth-mode-hook))
 
-(setq forth-mode-hook
+;;;###autoload
+(define-derived-mode forth-block-mode forth-mode "Forth Block Source" 
+  "Major mode for editing Forth block source files, derived from 
+`forth-mode'. Differences to `forth-mode' are:
+ * files are converted to block format, when written (`buffer-file-format' 
+   is set to `(forth-blocks)')
+ * `forth-show-screen' and `forth-warn-long-lines' are t by default
+  
+Note that the length of lines in block files is limited to 64 characters.
+When writing longer lines to a block file, a warning is displayed in the
+echo area and the line is truncated. 
+
+Another problem is imposed by block files that contain newline or tab 
+characters. When Emacs converts such files back to block file format, 
+it'll translate those characters to a number of spaces. However, when
+you read such a file, a warning message is displayed in the echo area,
+including a line number that may help you to locate and fix the problem.
+
+So have a look at the *Messages* buffer, whenever you hear (or see) Emacs' 
+bell during block file read/write operations."
+  (setq buffer-file-format '(forth-blocks))
+  (setq forth-show-screen t)
+  (setq forth-warn-long-lines t)
+  (setq forth-screen-number-string (format "%d" forth-block-base))
+  (setq mode-line-format (append (reverse (cdr (reverse mode-line-format)))
+				 '("--S" forth-screen-number-string "-%-"))))
+
+(add-hook 'forth-mode-hook
       '(lambda () 
 	 (make-local-variable 'compile-command)
-	 (setq compile-command "gforth ")))
+	 (setq compile-command "gforth ")
+	 (forth-hack-local-variables)
+	 (forth-customize-words)
+	 (forth-compile-words)
+	 (unless (and forth-jit-parser (>= emacs-major-version 21))
+	   (forth-change-function (point-min) (point-max) nil t))))
 
 (defun forth-fill-paragraph () 
   "Fill comments (starting with '\'; do not fill code (block style
@@ -233,12 +1350,12 @@ programmers who tend to fill code won't
     (beginning-of-line)
     (while (and
 	     (= (forward-line -1) 0)
-	     (looking-at "[ \t]*\\\\[ \t]+")))
-    (if (not (looking-at "[ \t]*\\\\[ \t]+"))
+	     (looking-at "[ \t]*\\\\g?[ \t]+")))
+    (if (not (looking-at "[ \t]*\\\\g?[ \t]+"))
 	(forward-line 1))
     (let ((from (point))
 	  (to (save-excursion (forward-paragraph) (point))))
-      (if (looking-at "[ \t]*\\\\[ \t]+")
+      (if (looking-at "[ \t]*\\\\g?[ \t]+")
 	  (progn (goto-char (match-end 0))
 		 (set-fill-prefix)
 		 (fill-region from to nil))))))
@@ -253,430 +1370,20 @@ programmers who tend to fill code won't
 	  (1+ (current-column)))
       comment-column)))
 
-(defun forth-current-indentation ()
-  (save-excursion
-    (beginning-of-line)
-    (back-to-indentation)
-    (current-column)))
-
-(defun forth-delete-indentation ()
-  (let ((b nil) (m nil))
-    (save-excursion
-      (beginning-of-line)
-      (setq b (point))
-      (back-to-indentation)
-      (setq m (point)))
-    (delete-region b m)))
-
-(defun forth-indent-line (&optional flag)
-  "Correct indentation of the current Forth line."
-  (let ((x (forth-calculate-indent)))
-    (forth-indent-to x)))
-  
-(defun forth-indent-command ()
-  (interactive)
-  (forth-indent-line t))
-
-(defun forth-indent-to (x)
-  (let ((p nil))
-    (setq p (- (current-column) (forth-current-indentation)))
-    (forth-delete-indentation)
-    (beginning-of-line)
-    (indent-to x)
-    (if (> p 0) (forward-char p))))
-
-;;Calculate indent
-(defun forth-calculate-indent ()
-  (let ((w1 nil) (indent 0) (centre 0))
-    (save-excursion
-      (beginning-of-line)
-      (skip-chars-backward " \t\n")
-      (beginning-of-line)
-      (back-to-indentation)
-      (setq indent (current-column))
-      (setq centre indent)
-      (setq indent (+ indent (forth-sum-line-indentation))))
-    (save-excursion
-      (beginning-of-line)
-      (back-to-indentation)
-      (let ((p (point)))
-	(skip-chars-forward "^ \t\n")
-	(setq w1 (buffer-substring p (point)))))
-    (if (> (- indent centre) forth-indent-level)
-	(setq indent (+ centre forth-indent-level)))
-    (if (> (- centre indent) forth-indent-level)
-	(setq indent (- centre forth-indent-level)))
-    (if (< indent 0) (setq indent 0))
-    (setq indent (- indent
-		    (if (string-match 
-			 (regexp-quote (concat " " w1 " "))
-			 forth-negatives)
-			forth-indent-level 0)))
-    (if (string-match (regexp-quote (concat " " w1 " ")) forth-zeroes)
-	(setq indent 0))
-    indent))
-
-(defun forth-sum-line-indentation ()
-  "Add upp the positive and negative weights of all words on the current line."
-  (let ((b (point)) (e nil) (sum 0) (w nil) (t1 nil) (t2 nil) (first t))
-    (end-of-line) (setq e (point))
-    (goto-char b)
-    (while (< (point) e)
-      (setq w (forth-next-word))
-      (setq t1 (string-match (regexp-quote (concat " " w " "))
-			     forth-positives))
-      (setq t2 (string-match (regexp-quote (concat " " w " "))
-			     forth-negatives))
-      (if t1
-	  (setq sum (+ sum forth-indent-level)))
-      (if (and t2 (not first))
-	  (setq sum (- sum forth-indent-level)))
-      (skip-chars-forward " \t")
-      (setq first nil))
-    sum))
-
-
-(defun forth-next-word ()
-  "Return the next forth-word. Skip anything that the forth-word takes from
-the input stream (comments, arguments, etc.)"
-;actually, it would be better to use commands based on the
-;syntax-table or comment-start etc.
-  (let ((w1 nil))
-    (while (not w1)
-      (skip-chars-forward " \t\n")
-      (let ((p (point)))
-	(skip-chars-forward "^ \t\n")
-	(setq w1 (buffer-substring p (point))))
-      (cond ((string-match "\"" w1)
-	     (progn
-	       (skip-chars-forward "^\"\n")
-	       (forward-char)))
-	    ((string-match "\\\\" w1)
-	     (progn
-	       (end-of-line)
-	       ))
-	    ((or (equal "(" w1) (equal ".(" w1))
-	     (progn
-	       (skip-chars-forward "^)\n")
-	       (forward-char)))
-	    ((string-match (regexp-quote (concat " " w1 " ")) forth-prefixes)
-	     (progn (skip-chars-forward " \t\n")
-		    (skip-chars-forward "^ \t\n")))
-	    (t nil)))
-    w1))
-      
 
 ;; Forth commands
 
 (defun forth-remove-tracers ()
   "Remove tracers of the form `~~ '. Queries the user for each occurrence."
   (interactive)
-  (query-replace "~~ " ""))
-
-(defvar forth-program-name "gforth"
-  "*Program invoked by the `run-forth' command.")
-
-(defvar forth-band-name nil
-  "*Band loaded by the `run-forth' command.")
-
-(defvar forth-program-arguments nil
-  "*Arguments passed to the Forth program by the `run-forth' command.")
-
-(defun run-forth (command-line)
-  "Run an inferior Forth process. Output goes to the buffer `*forth*'.
-With argument, asks for a command line. Split up screen and run forth 
-in the lower portion. The current-buffer when called will stay in the
-upper portion of the screen, and all other windows are deleted.
-Call run-forth again to make the *forth* buffer appear in the lower
-part of the screen."
-  (interactive
-   (list (let ((default
-		 (or forth-process-command-line
-		     (forth-default-command-line))))
-	   (if current-prefix-arg
-	       (read-string "Run Forth: " default)
-	       default))))
-  (setq forth-process-command-line command-line)
-  (forth-start-process command-line)
-  (forth-split)
-  (forth-set-runlight forth-runlight:input))
-
-(defun reset-forth ()
-  "Reset the Forth process."
-  (interactive)
-  (let ((process (get-process forth-program-name)))
-    (cond ((or (not process)
-	       (not (eq (process-status process) 'run))
-	       (yes-or-no-p
-"The Forth process is running, are you SURE you want to reset it? "))
-	   (message "Resetting Forth process...")
-	   (forth-reload)
-	   (message "Resetting Forth process...done")))))
-
-(defun forth-default-command-line ()
-  (concat forth-program-name " -emacs"
-	  (if forth-program-arguments
-	      (concat " " forth-program-arguments)
-	      "")
-	  (if forth-band-name
-	      (concat " -band " forth-band-name)
-	      "")))
-
-;;;; Internal Variables
-
-(defvar forth-process-command-line nil
-  "Command used to start the most recent Forth process.")
-
-(defvar forth-previous-send ""
-  "Most recent expression transmitted to the Forth process.")
-
-(defvar forth-process-filter-queue '()
-  "Queue used to synchronize filter actions properly.")
-
-(defvar forth-prompt "ok"
-  "The current forth prompt string.")
-
-(defvar forth-start-hook nil
-  "If non-nil, a procedure to call when the Forth process is started.
-When called, the current buffer will be the Forth process-buffer.")
-
-(defvar forth-signal-death-message nil
-  "If non-nil, causes a message to be generated when the Forth process dies.")
-
-(defvar forth-percent-height 50
-  "Tells run-forth how high the upper window should be in percent.")
-
-(defconst forth-runlight:input ?I
-  "The character displayed when the Forth process is waiting for input.")
-
-(defvar forth-mode-string ""
-  "String displayed in the mode line when the Forth process is running.")
-
-;;;; Evaluation Commands
-
-(defun forth-send-string (&rest strings)
-  "Send the string arguments to the Forth process.
-The strings are concatenated and terminated by a newline."
-  (cond ((forth-process-running-p)
-	 (forth-send-string-1 strings))
-	((yes-or-no-p "The Forth process has died.  Reset it? ")
-	 (reset-forth)
-	 (goto-char (point-max))
-	 (forth-send-string-1 strings))))
-
-(defun forth-send-string-1 (strings)
-  (let ((string (apply 'concat strings)))
-    (forth-send-string-2 string)))
-
-(defun forth-send-string-2 (string)
-  (let ((process (get-process forth-program-name)))
-    (if (not (eq (current-buffer) (get-buffer forth-program-name)))
-	(progn
-	 (forth-process-filter-output string)
-	 (forth-process-filter:finish)))
-    (send-string process (concat string "\n"))
-    (if (eq (current-buffer) (process-buffer process))
-	(set-marker (process-mark process) (point)))))
-
-
-(defun forth-send-region (start end)
-  "Send the current region to the Forth process.
-The region is sent terminated by a newline."
-  (interactive "r")
-  (let ((process (get-process forth-program-name)))
-    (if (and process (eq (current-buffer) (process-buffer process)))
-	(progn (goto-char end)
-	       (set-marker (process-mark process) end))))
-  (forth-send-string "\n" (buffer-substring start end) "\n"))
-
-(defun forth-end-of-paragraph ()
-  (if (looking-at "[\t\n ]+") (skip-chars-backward  "\t\n "))
-  (if (not (re-search-forward "\n[ \t]*\n" nil t))
-      (goto-char (point-max))))
-
-(defun forth-send-paragraph ()
-  "Send the current or the previous paragraph to the Forth process"
-  (interactive)
-  (let (end)
-    (save-excursion
-      (forth-end-of-paragraph)
-      (skip-chars-backward  "\t\n ")
-      (setq end (point))
-      (if (re-search-backward "\n[ \t]*\n" nil t)
-	  (setq start (point))
-	(goto-char (point-min)))
-      (skip-chars-forward  "\t\n ")
-      (forth-send-region (point) end))))
-  
-(defun forth-send-buffer ()
-  "Send the current buffer to the Forth process."
-  (interactive)
-  (if (eq (current-buffer) (forth-process-buffer))
-      (error "Not allowed to send this buffer's contents to Forth"))
-  (forth-send-region (point-min) (point-max)))
-
-
-;;;; Basic Process Control
-
-(defun forth-start-process (command-line)
-  (let ((buffer (get-buffer-create "*forth*")))
-    (let ((process (get-buffer-process buffer)))
-      (save-excursion
-	(set-buffer buffer)
-	(progn (if process (delete-process process))
-	       (goto-char (point-max))
-	       (setq mode-line-process '(": %s"))
-	       (add-to-global-mode-string 'forth-mode-string)
-	       (setq process
-		     (apply 'start-process
-			    (cons forth-program-name
-				  (cons buffer
-					(forth-parse-command-line
-					 command-line)))))
-	       (set-marker (process-mark process) (point-max))
-	       (forth-process-filter-initialize t)
-	       (forth-modeline-initialize)
-	       (set-process-sentinel process 'forth-process-sentinel)
-	       (set-process-filter process 'forth-process-filter)
-	       (run-hooks 'forth-start-hook)))
-    buffer)))
-
-(defun forth-parse-command-line (string)
-  (setq string (substitute-in-file-name string))
-  (let ((start 0)
-	(result '()))
-    (while start
-      (let ((index (string-match "[ \t]" string start)))
-	(setq start
-	      (cond ((not index)
-		     (setq result
-			   (cons (substring string start)
-				 result))
-		     nil)
-		    ((= index start)
-		     (string-match "[^ \t]" string start))
-		    (t
-		     (setq result
-			   (cons (substring string start index)
-				 result))
-		     (1+ index))))))
-    (nreverse result)))
-
-
-(defun forth-process-running-p ()
-  "True iff there is a Forth process whose status is `run'."
-  (let ((process (get-process forth-program-name)))
-    (and process
-	 (eq (process-status process) 'run))))
-
-(defun forth-process-buffer ()
-  (let ((process (get-process forth-program-name)))
-    (and process (process-buffer process))))
-
-;;;; Process Filter
-
-(defun forth-process-sentinel (proc reason)
-  (let ((inhibit-quit nil))
-    (forth-process-filter-initialize (eq reason 'run))
-    (if (eq reason 'run)
-	(forth-modeline-initialize)
-	(setq forth-mode-string "")))
-  (if (and (not (memq reason '(run stop)))
-	   forth-signal-death-message)
-      (progn (beep)
-	     (message
-"The Forth process has died!  Do M-x reset-forth to restart it"))))
-
-(defun forth-process-filter-initialize (running-p)
-  (setq forth-process-filter-queue (cons '() '()))
-  (setq forth-prompt "ok"))
-
-
-(defun forth-process-filter (proc string)
-  (forth-process-filter-output string)
-  (forth-process-filter:finish))
-
-(defun forth-process-filter:enqueue (action)
-  (let ((next (cons action '())))
-    (if (cdr forth-process-filter-queue)
-	(setcdr (cdr forth-process-filter-queue) next)
-	(setcar forth-process-filter-queue next))
-    (setcdr forth-process-filter-queue next)))
-
-(defun forth-process-filter:finish ()
-  (while (car forth-process-filter-queue)
-    (let ((next (car forth-process-filter-queue)))
-      (setcar forth-process-filter-queue (cdr next))
-      (if (not (cdr next))
-	  (setcdr forth-process-filter-queue '()))
-      (apply (car (car next)) (cdr (car next))))))
-
-;;;; Process Filter Output
-
-(defun forth-process-filter-output (&rest args)
-  (if (not (and args
-		(null (cdr args))
-		(stringp (car args))
-		(string-equal "" (car args))))
-      (forth-process-filter:enqueue
-       (cons 'forth-process-filter-output-1 args))))
-
-(defun forth-process-filter-output-1 (&rest args)
-  (save-excursion
-    (forth-goto-output-point)
-    (apply 'insert-before-markers args)))
-
-(defun forth-guarantee-newlines (n)
-  (save-excursion
-    (forth-goto-output-point)
-    (let ((stop nil))
-      (while (and (not stop)
-		  (bolp))
-	(setq n (1- n))
-	(if (bobp)
-	    (setq stop t)
-	  (backward-char))))
-    (forth-goto-output-point)
-    (while (> n 0)
-      (insert-before-markers ?\n)
-      (setq n (1- n)))))
-
-(defun forth-goto-output-point ()
-  (let ((process (get-process forth-program-name)))
-    (set-buffer (process-buffer process))
-    (goto-char (process-mark process))))
-
-(defun forth-modeline-initialize ()
-  (setq forth-mode-string "  "))
-
-(defun forth-set-runlight (runlight)
-  (aset forth-mode-string 0 runlight)
-  (forth-modeline-redisplay))
-
-(defun forth-modeline-redisplay ()
-  (save-excursion (set-buffer (other-buffer)))
-  (set-buffer-modified-p (buffer-modified-p))
-  (sit-for 0))
-
-;;;; Process Filter Operations
-
-(defun add-to-global-mode-string (x)
-  (cond ((null global-mode-string)
-	 (setq global-mode-string (list "" x " ")))
-	((not (memq x global-mode-string))
-	 (setq global-mode-string
-	       (cons ""
-		     (cons x
-			   (cons " "
-				 (if (equal "" (car global-mode-string))
-				     (cdr global-mode-string)
-				     global-mode-string))))))))
-
+  (query-replace-regexp "\\(~~ \\| ~~$\\)" "" nil))
 
-;; Misc
+(define-key forth-mode-map "\C-x\C-e" 'compile)
+(define-key forth-mode-map "\C-x\C-n" 'next-error)
+(require 'compile)
 
-(setq auto-mode-alist (append auto-mode-alist
-				'(("\\.fs$" . forth-mode))))
+(defvar forth-compile-command "gforth ")
+;(defvar forth-compilation-window-percent-height 30)
 
 (defun forth-split ()
   (interactive)
@@ -687,182 +1394,316 @@ The region is sent terminated by a newli
       (progn
 	(delete-other-windows)
 	(split-window-vertically
-	 (/ (* (screen-height) forth-percent-height) 100))
+	 (/ (frame-height) 2))
 	(other-window 1)
 	(switch-to-buffer buffer)
 	(goto-char (point-max))
 	(other-window 1))))
-    
-(defun forth-reload ()
-  (interactive)
-  (let ((process (get-process forth-program-name)))
-    (if process (kill-process process t)))
-  (sleep-for-millisecs 100)
-  (forth-mode))
-
-
-;; Special section for forth-help
-
-(defvar forth-help-buffer "*Forth-help*"
-  "Buffer used to display the requested documentation.")
-
-(defvar forth-help-load-path nil
-  "List of directories to search through to find *.doc
- (forth-help-file-suffix) files. Nil means current default directory.
- The specified directories must contain at least one .doc file. If it
- does not and you still want the load-path to scan that directory, create
- an empty file dummy.doc.")
-
-(defvar forth-help-file-suffix "*.doc"
-  "The file names to search for in each directory.")
-
-(setq forth-search-command-prefix "grep -n \"^    [^(]* ")
-(defvar forth-search-command-suffix "/dev/null")
-(defvar forth-grep-error-regexp ": No such file or directory")
-
-(defun forth-function-called-at-point ()
-  "Return the space delimited word a point."
-  (save-excursion
-    (save-restriction
-      (narrow-to-region (max (point-min) (- (point) 1000)) (point-max))
-      (skip-chars-backward "^ \t\n" (point-min))
-      (if (looking-at "[ \t\n]")
-	  (forward-char 1))
-      (let (obj (p (point)))
-	(skip-chars-forward "^ \t\n")
-	(buffer-substring p (point))))))
-
-(defun forth-help-names-extend-comp (path-list result)
-  (cond ((null path-list) result)
-	((null (car path-list))
-	 (forth-help-names-extend-comp (cdr path-list) 
-	       (concat result forth-help-file-suffix " ")))
-	(t (forth-help-names-extend-comp
-	    (cdr path-list) (concat result
-				    (expand-file-name (car path-list)) "/"
-				    forth-help-file-suffix " ")))))
-
-(defun forth-help-names-extended ()
-  (if forth-help-load-path
-      (forth-help-names-extend-comp forth-help-load-path "")
-    (error "forth-help-load-path not specified")))
-
-
-;(define-key forth-mode-map "\C-hf" 'forth-documentation)
-
-(defun forth-documentation (function)
-  "Display the full documentation of FORTH word."
-  (interactive
-   (let ((fn (forth-function-called-at-point))
-	 (enable-recursive-minibuffers t)	     
-	 search-list
-	 val)
-     (setq val (read-string (format "Describe forth word (default %s): " fn)))
-     (list (if (equal val "") fn val))))
-  (forth-get-doc (concat forth-search-command-prefix
-			 (grep-regexp-quote (concat function " ("))
-			 "[^)]*\-\-\" " (forth-help-names-extended)
-			 forth-search-command-suffix))
-  (message "C-x C-m switches back to the forth interaction window"))
-
-(defun forth-get-doc (command)
-  "Display the full documentation of command."
-  (let ((curwin (get-buffer-window (window-buffer)))
-	reswin
-	pointmax)
-    (with-output-to-temp-buffer forth-help-buffer
-      (progn
-	(call-process "sh" nil forth-help-buffer t "-c" command)
-	(setq reswin (get-buffer-window forth-help-buffer))))
-    (setq reswin (get-buffer-window forth-help-buffer))
-    (select-window reswin)
-    (save-excursion
-      (goto-char (setq pointmax (point-max)))
-      (insert "--------------------\n\n"))
-    (let (fd doc) 
-      (while (setq fd (forth-get-file-data pointmax))
-	(setq doc (forth-get-doc-string fd))
-	(save-excursion
-	  (goto-char (point-max))
-	  (insert (substring (car fd) (string-match "[^/]*$" (car fd)))
-		  ":\n\n" doc "\n")))
-      (if (not doc)
-	  (progn (goto-char (point-max)) (insert "Not found"))))
-    (select-window curwin)))
-  
-(defun forth-skip-error-lines ()
-  (let ((lines 0))
-    (save-excursion
-      (while (re-search-forward forth-grep-error-regexp nil t)
-	(beginning-of-line)
-	(forward-line 1)
-	(setq lines (1+ lines))))
-    (forward-line lines)))
-
-(defun forth-get-doc-string (fd)
-  "Find file (car fd) and extract documentation from line (nth 1 fd)."
-  (let (result)
-    (save-window-excursion
-      (find-file (car fd))
-      (goto-line (nth 1 fd))
-      (if (not (eq (nth 1 fd) (1+ (count-lines (point-min) (point)))))
-	  (error "forth-get-doc-string: serious error"))
-      (if (not (re-search-backward "\n[\t ]*\n" nil t))
-	  (goto-char (point-min))
-	(goto-char (match-end 0)))
-      (let ((p (point)))
-	(if (not (re-search-forward "\n[\t ]*\n" nil t))
-	    (goto-char (point-max)))
-	(setq result (buffer-substring p (point))))
-      (bury-buffer (current-buffer)))
-    result))
-
-(defun forth-get-file-data (limit)
-  "Parse grep output and return '(filename line#) list. Return nil when
- passing limit."
-  (forth-skip-error-lines)
-  (if (< (point) limit)
-      (let ((result (forth-get-file-data-cont limit)))
-	(forward-line 1)
-	(beginning-of-line)
-	result)))
-
-(defun forth-get-file-data-cont (limit)
-  (let (result)
-    (let ((p (point)))
-      (skip-chars-forward "^:")
-      (setq result (buffer-substring p (point))))
-    (if (< (point) limit)
-	(let ((p (1+ (point))))
-	  (forward-char 1)
-	  (skip-chars-forward "^:")
-	  (list result (string-to-int (buffer-substring p (point))))))))
-
-(defun grep-regexp-quote (str)
-  (let ((i 0) (m 1) (res ""))
-    (while (/= m 0)
-      (setq m (string-to-char (substring str i)))
-      (if (/= m 0)
-	  (progn
-	    (setq i (1+ i))
-	    (if (string-match (regexp-quote (char-to-string m))
-			      ".*\\^$[]")
-		(setq res (concat res "\\")))
-	    (setq res (concat res (char-to-string m))))))
-    res))
 
+;;; Forth menu
+;;; Mikael Karlsson <qramika@eras70.ericsson.se>
 
-(define-key forth-mode-map "\C-x\C-e" 'compile)
-(define-key forth-mode-map "\C-x\C-n" 'next-error)
-(require 'compile "compile")
-
-(defvar forth-compile-command "gforth ")
-;(defvar forth-compilation-window-percent-height 30)
+;; (dk) code commented out due to complaints of XEmacs users.  After
+;; all, there's imenu/speedbar, which uses much smarter scanning
+;; rules.
+
+;; (cond ((string-match "XEmacs\\|Lucid" emacs-version)
+;;        (require 'func-menu)
+
+;;   (defconst fume-function-name-regexp-forth
+;;    "^\\(:\\)[ \t]+\\([^ \t]*\\)"
+;;    "Expression to get word definitions in Forth.")
+
+;;   (setq fume-function-name-regexp-alist
+;;       (append '((forth-mode . fume-function-name-regexp-forth) 
+;;              ) fume-function-name-regexp-alist))
+
+;;   ;; Find next forth word in the buffer
+;;   (defun fume-find-next-forth-function-name (buffer)
+;;     "Searches for the next forth word in BUFFER."
+;;     (set-buffer buffer)
+;;     (if (re-search-forward fume-function-name-regexp nil t)
+;;       (let ((beg (match-beginning 2))
+;;             (end (match-end 2)))
+;;         (cons (buffer-substring beg end) beg))))
+
+;;   (setq fume-find-function-name-method-alist
+;;   (append '((forth-mode    . fume-find-next-forth-function-name))))
+
+;;   ))
+;;; End Forth menu
+
+;;; File folding of forth-files
+;;; uses outline
+;;; Toggle activation with M-x fold-f (when editing a forth-file) 
+;;; Use f9 to expand, f10 to hide, Or the menubar in xemacs
+;;;
+;;; Works most of the times but loses sync with the cursor occasionally 
+;;; Could be improved by also folding on comments
+
+;; (dk) This code needs a rewrite; just too ugly and doesn't use the
+;; newer and smarter scanning rules of `imenu'. Who needs it anyway??
+
+;; (require 'outline)
+
+;; (defun f-outline-level ()
+;;   (cond	((looking-at "\\`\\\\")
+;; 	 0)
+;; 	((looking-at "\\\\ SEC")
+;; 	 0)
+;; 	((looking-at "\\\\ \\\\ .*")
+;; 	 0)
+;; 	((looking-at "\\\\ DEFS")
+;; 	 1)
+;; 	((looking-at "\\/\\* ")
+;; 	 1)
+;; 	((looking-at ": .*")
+;; 	 1)
+;; 	((looking-at "\\\\G")
+;; 	 2)
+;; 	((looking-at "[ \t]+\\\\")
+;; 	 3)))
+  
+;; (defun fold-f  ()
+;;    (interactive)
+;;    (add-hook 'outline-minor-mode-hook 'hide-body)
+
+;;    ; outline mode header start, i.e. find word definitions
+;; ;;;   (setq  outline-regexp  "^\\(:\\)[ \t]+\\([^ \t]*\\)")
+;;    (setq  outline-regexp  "\\`\\\\\\|:\\|\\\\ SEC\\|\\\\G\\|[ \t]+\\\\\\|\\\\ DEFS\\|\\/\\*\\|\\\\ \\\\ .*")
+;;    (setq outline-level 'f-outline-level)
+
+;;    (outline-minor-mode)
+;;    (define-key outline-minor-mode-map '(shift up) 'hide-sublevels)
+;;    (define-key outline-minor-mode-map '(shift right) 'show-children)
+;;    (define-key outline-minor-mode-map '(shift left) 'hide-subtree)
+;;    (define-key outline-minor-mode-map '(shift down) 'show-subtree))
+
+
+;;(define-key global-map '(shift up) 'fold-f)
+
+;;; end file folding
+
+;;; func-menu is a package that scans your source file for function definitions
+;;; and makes a menubar entry that lets you jump to any particular function
+;;; definition by selecting it from the menu.  The following code turns this on
+;;; for all of the recognized languages.  Scanning the buffer takes some time,
+;;; but not much.
+;;;
+;; (cond ((string-match "XEmacs\\|Lucid" emacs-version)
+;;        (require 'func-menu)
+;; ;;       (define-key global-map 'f8 'function-menu)
+;;        (add-hook 'find-fible-hooks 'fume-add-menubar-entry)
+;; ;       (define-key global-map "\C-cg" 'fume-prompt-function-goto)
+;; ;       (define-key global-map '(shift button3) 'mouse-function-menu)
+;; ))
+
+;;;
+;;; Inferior Forth interpreter 
+;;;	-- mostly copied from `cmuscheme.el' of Emacs 21.2
+;;;
+
+(eval-and-compile (forth-require 'comint))
+
+(when (memq 'comint features)
+
+  (defvar forth-program-name "gforth"
+    "*Program invoked by the `run-forth' command, including program arguments")
+
+  (defcustom inferior-forth-mode-hook nil
+    "*Hook for customising inferior-forth-mode."
+    :type 'hook
+    :group 'forth)
+
+  (defvar inferior-forth-mode-map
+    (let ((m (make-sparse-keymap)))
+      (define-key m "\r" 'comint-send-input)
+      (define-key m "\M-\C-x" 'forth-send-paragraph-and-go)
+      (define-key m "\C-c\C-l" 'forth-load-file)
+      m))
+  ;; Install the process communication commands in the forth-mode keymap.
+  (define-key forth-mode-map "\e\C-m" 'forth-send-paragraph-and-go)
+  (define-key forth-mode-map "\eo" 'forth-send-buffer-and-go)
+
+  (define-key forth-mode-map "\M-\C-x" 'forth-send-paragraph-and-go)
+  (define-key forth-mode-map "\C-c\C-r" 'forth-send-region)
+  (define-key forth-mode-map "\C-c\M-r" 'forth-send-region-and-go)
+  (define-key forth-mode-map "\C-c\C-z" 'forth-switch-to-interactive)
+  (define-key forth-mode-map "\C-c\C-l" 'forth-load-file)
+
+  (defvar forth-process-buffer)
+
+  (define-derived-mode inferior-forth-mode comint-mode "Inferior Forth"
+    "Major mode for interacting with an inferior Forth process.
+
+The following commands are available:
+\\{inferior-forth-mode-map}
+
+A Forth process can be fired up with M-x run-forth.
+
+Customisation: Entry to this mode runs the hooks on comint-mode-hook and
+inferior-forth-mode-hook (in that order).
+
+You can send text to the inferior Forth process from other buffers containing
+Forth source.
+    forth-switch-to-interactive switches the current buffer to the Forth
+        process buffer. 
+    forth-send-paragraph sends the current paragraph to the Forth process.
+    forth-send-region sends the current region to the Forth process.
+    forth-send-buffer sends the current buffer to the Forth process.
+
+    forth-send-paragraph-and-go, forth-send-region-and-go,
+        forth-send-buffer-and-go switch to the Forth process buffer after
+        sending their text.
+For information on running multiple processes in multiple buffers, see
+documentation for variable `forth-process-buffer'.
+
+Commands:
+Return after the end of the process' output sends the text from the
+end of process to point. If you accidentally suspend your process, use
+\\[comint-continue-subjob] to continue it. "
+    ;; Customise in inferior-forth-mode-hook
+    (setq comint-prompt-regexp "^") 
+    (setq mode-line-process '(":%s")))
+
+  (defun forth-args-to-list (string)
+    (let ((where (string-match "[ \t]" string)))
+      (cond ((null where) (list string))
+	    ((not (= where 0))
+	     (cons (substring string 0 where)
+		   (forth-args-to-list (substring string (+ 1 where)
+						  (length string)))))
+	    (t (let ((pos (string-match "[^ \t]" string)))
+		 (if (null pos)
+		     nil
+		   (forth-args-to-list (substring string pos
+						  (length string)))))))))
 
-(defun forth-compile (command)
-  (interactive (list (setq forth-compile-command (read-string "Compile command: " forth-compile-command))))
-  (forth-split-1 "*compilation*")
-  (setq ctools-compile-command command)
-  (compile1 ctools-compile-command "No more errors"))
+;;;###autoload
+  (defun run-forth (cmd)
+    "Run an inferior Forth process, input and output via buffer *forth*.
+If there is a process already running in `*forth*', switch to that buffer.
+With argument, allows you to edit the command line (default is value
+of `forth-program-name').  Runs the hooks `inferior-forth-mode-hook'
+\(after the `comint-mode-hook' is run).
+\(Type \\[describe-mode] in the process buffer for a list of commands.)"
+
+    (interactive (list (if current-prefix-arg
+			   (read-string "Run Forth: " forth-program-name)
+			 forth-program-name)))
+    (if (not (comint-check-proc "*forth*"))
+	(let ((cmdlist (forth-args-to-list cmd)))
+	  (set-buffer (apply 'make-comint "forth" (car cmdlist)
+			     nil (cdr cmdlist)))
+	  (inferior-forth-mode)))
+    (setq forth-program-name cmd)
+    (setq forth-process-buffer "*forth*")
+    (pop-to-buffer "*forth*"))
+
+  (defun forth-send-region (start end)
+    "Send the current region to the inferior Forth process."
+    (interactive "r")
+    (comint-send-region (forth-proc) start end)
+    (comint-send-string (forth-proc) "\n"))
+
+  (defun forth-end-of-paragraph ()
+    (if (looking-at "[\t\n ]+") (skip-chars-backward  "\t\n "))
+    (if (not (re-search-forward "\n[ \t]*\n" nil t))
+	(goto-char (point-max))))
+
+  (defun forth-send-paragraph ()
+    "Send the current or the previous paragraph to the Forth process"
+    (interactive)
+    (let (end)
+      (save-excursion
+	(forth-end-of-paragraph)
+	(skip-chars-backward  "\t\n ")
+	(setq end (point))
+	(if (null (re-search-backward "\n[ \t]*\n" nil t))
+	  (goto-char (point-min)))
+	(skip-chars-forward  "\t\n ")
+	(forth-send-region (point) end))))
+
+  (defun forth-send-paragraph-and-go ()
+    "Send the current or the previous paragraph to the Forth process.
+Then switch to the process buffer."
+    (interactive)
+    (forth-send-paragraph)
+    (forth-switch-to-interactive t))
+
+  (defun forth-send-buffer ()
+    "Send the current buffer to the Forth process."
+    (interactive)
+    (if (eq (current-buffer) forth-process-buffer)
+	(error "Not allowed to send this buffer's contents to Forth"))
+    (forth-send-region (point-min) (point-max)))
+
+  (defun forth-send-buffer-and-go ()
+    "Send the current buffer to the Forth process.
+Then switch to the process buffer."
+    (interactive)
+    (forth-send-buffer)
+    (forth-switch-to-interactive t))
+
+
+  (defun forth-switch-to-interactive (eob-p)
+    "Switch to the Forth process buffer.
+With argument, position cursor at end of buffer."
+    (interactive "P")
+    (if (get-buffer forth-process-buffer)
+	(pop-to-buffer forth-process-buffer)
+      (error "No current process buffer.  See variable `forth-process-buffer'"))
+    (cond (eob-p
+	   (push-mark)
+	   (goto-char (point-max)))))
+
+  (defun forth-send-region-and-go (my-start end)
+    "Send the current region to the inferior Forth process.
+Then switch to the process buffer."
+    (interactive "r")
+    (forth-send-region my-start end)
+    (forth-switch-to-interactive t))
+
+  (defcustom forth-source-modes '(forth-mode forth-block-mode)
+    "*Used to determine if a buffer contains Forth source code.
+If it's loaded into a buffer that is in one of these major modes, it's
+considered a Forth source file by `forth-load-file' and `forth-compile-file'.
+Used by these commands to determine defaults."
+    :type '(repeat function)
+    :group 'forth)
+
+  (defvar forth-prev-l/c-dir/file nil
+    "Caches the last (directory . file) pair.
+Caches the last pair used in the last `forth-load-file' or
+`forth-compile-file' command. Used for determining the default in the
+next one.")
+
+  (defun forth-load-file (file-name)
+    "Load a Forth file FILE-NAME into the inferior Forth process."
+    (interactive (comint-get-source "Load Forth file: " forth-prev-l/c-dir/file
+				    forth-source-modes t)) ; T because LOAD
+					; needs an exact name
+    (comint-check-source file-name) ; Check to see if buffer needs saved.
+    (setq forth-prev-l/c-dir/file (cons (file-name-directory file-name)
+					(file-name-nondirectory file-name)))
+    (comint-send-string (forth-proc)
+			(concat "s\" " file-name "\" included\n")))
+
+  
+  (defvar forth-process-buffer nil "*The current Forth process buffer.
+
+See `scheme-buffer' for an explanation on how to run multiple Forth 
+processes.")
+
+  (defun forth-proc ()
+    "Return the current Forth process.  See variable `forth-process-buffer'."
+    (let ((proc (get-buffer-process (if (eq major-mode 'inferior-forth-mode)
+					(current-buffer)
+				      forth-process-buffer))))
+      (or proc
+	  (error "No current process.  See variable `forth-process-buffer'"))))
+  )  ; (memq 'comint features)
 
+(provide 'forth-mode)
 
+;;; gforth.el ends here