--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/modes/vhdl-mode.el	Mon Aug 13 08:47:52 2007 +0200
@@ -0,0 +1,2647 @@
+;;; vhdl-mode.el --- major mode for editing VHDL code
+
+;; Copyright (C) 1994, 1995 Rodney J. Whitby
+;; Copyright (C) 1992, 1993, 1994 Barry A. Warsaw
+;; Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
+
+;; Author:	  Rodney J. Whitby <rwhitby@asc.corp.mot.com>
+;; Maintainer:	  Rodney J. Whitby <rwhitby@asc.corp.mot.com>
+;; Created:	  June 1994, adapted from cc-mode.el 4.29 by Barry A. Warsaw.
+;; Version:	  $Revision: 1.1 $
+;; Last Modified: $Date: 1996/12/29 00:14:59 $
+;; Keywords:	  languages VHDL
+;; Archive:	  ftp.eda.com.au:/pub/emacs/vhdl-mode.tar.gz
+
+;; NOTE: Read the commentary below for the right way to submit bug reports!
+
+;; This file is not yet part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; This package provides indentation support for VHDL code.
+
+;; Details on VHDL-MODE are  now contained in an  accompanying texinfo
+;; manual (vhdl-mode.texi).
+
+;; To submit bug reports, hit "C-c C-b", and please try to include a
+;; code sample so I can reproduce your problem.  If you have other
+;; questions contact me at the address listed at the top of this file.
+
+;; YOU CAN IGNORE ALL BYTE-COMPILER WARNINGS. They are the result of
+;; the multi-Emacsen support. FSF Emacs 19 and XEmacs 19 (formerly
+;; Lucid) do things differently and there's no way to shut the
+;; byte-compiler up at the necessary granularity.  Let me say this
+;; again: YOU CAN IGNORE ALL BYTE-COMPILER WARNINGS (you'd be
+;; surprised at how many people don't follow this advice :-).
+
+;; To use VHDL-MODE, add the following to your .emacs file.  This
+;; assumes you will use .vhd extensions for your VHDL source:
+;;
+;; (autoload 'vhdl-mode   "vhdl-mode" "VHDL Editing Mode" t)
+;; (setq auto-mode-alist
+;;   (append '(("\\.vhd$"  . vhdl-mode)   ; to edit VHDL code
+;;            ) auto-mode-alist))
+;;
+;; If you would like to join the `vhdl-mode-announce' announcements
+;; list or the `vhdl-mode-victims' beta testers list, send add/drop
+;; requests to the address listed at the top of this file.
+;;
+;; Many, many thanks go out to all the folks on the beta test list.
+;; Without their patience, testing, insight, and code contributions,
+;; and encouragement vhdl-mode.el would be a far inferior package.
+;; Special thanks to Ken Wood <ken@eda.com.au> for providing an FTP
+;; repository for vhdl-mode.
+
+;; LCD Archive Entry:
+;; vhdl-mode.el|Rodney J. Whitby|rwhitby@asc.corp.mot.com
+;; |Major mode for editing VHDL code
+;; |$Date: 1996/12/29 00:14:59 $|$Revision: 1.1 $
+;; |ftp.eda.com.au:/pub/emacs/vhdl-mode.tar.gz
+
+
+;;; Code:
+
+;; user definable variables
+;; vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
+
+(defvar vhdl-inhibit-startup-warnings-p nil
+  "*If non-nil, inhibits start up compatibility warnings.")
+(defvar vhdl-strict-syntax-p nil
+  "*If non-nil, all syntactic symbols must be found in `vhdl-offsets-alist'.
+If the syntactic symbol for a particular line does not match a symbol
+in the offsets alist, an error is generated, otherwise no error is
+reported and the syntactic symbol is ignored.")
+(defvar vhdl-echo-syntactic-information-p nil
+  "*If non-nil, syntactic info is echoed when the line is indented.")
+(defvar vhdl-basic-offset 2
+  "*Amount of basic offset used by + and - symbols in `vhdl-offsets-alist'.")
+
+(defconst vhdl-offsets-alist-default
+  '((string                . -1000)
+    (block-open            . 0)
+    (block-close           . 0)
+    (statement             . 0)
+    (statement-cont        . vhdl-lineup-statement-cont)
+    (statement-block-intro . +)
+    (statement-case-intro  . +)
+    (case-alternative      . +)
+    (comment               . vhdl-lineup-comment)
+    (arglist-intro         . vhdl-lineup-arglist-intro)
+    (arglist-cont          . 0)
+    (arglist-cont-nonempty . vhdl-lineup-arglist)
+    (arglist-close         . vhdl-lineup-arglist)
+    (entity                . 0)
+    (configuration         . 0)
+    (package               . 0)
+    (architecture          . 0)
+    (package-body          . 0)
+    )
+  "Default settings for offsets of syntactic elements.
+Do not change this constant!  See the variable `vhdl-offsets-alist' for
+more information.")
+
+(defvar vhdl-offsets-alist (copy-alist vhdl-offsets-alist-default)
+  "*Association list of syntactic element symbols and indentation offsets.
+As described below, each cons cell in this list has the form:
+
+    (SYNTACTIC-SYMBOL . OFFSET)
+
+When a line is indented, vhdl-mode first determines the syntactic
+context of the line by generating a list of symbols called syntactic
+elements.  This list can contain more than one syntactic element and
+the global variable `vhdl-syntactic-context' contains the context list
+for the line being indented.  Each element in this list is actually a
+cons cell of the syntactic symbol and a buffer position.  This buffer
+position is call the relative indent point for the line.  Some
+syntactic symbols may not have a relative indent point associated with
+them.
+
+After the syntactic context list for a line is generated, vhdl-mode
+calculates the absolute indentation for the line by looking at each
+syntactic element in the list.  First, it compares the syntactic
+element against the SYNTACTIC-SYMBOL's in `vhdl-offsets-alist'.  When it
+finds a match, it adds the OFFSET to the column of the relative indent
+point.  The sum of this calculation for each element in the syntactic
+list is the absolute offset for line being indented.
+
+If the syntactic element does not match any in the `vhdl-offsets-alist',
+an error is generated if `vhdl-strict-syntax-p' is non-nil, otherwise
+the element is ignored.
+
+Actually, OFFSET can be an integer, a function, a variable, or one of
+the following symbols: `+', `-', `++', or `--'.  These latter
+designate positive or negative multiples of `vhdl-basic-offset',
+respectively: *1, *-1, *2, and *-2. If OFFSET is a function, it is
+called with a single argument containing the cons of the syntactic
+element symbol and the relative indent point.  The function should
+return an integer offset.
+
+Here is the current list of valid syntactic element symbols:
+
+ string                 -- inside multi-line string
+ block-open             -- statement block open
+ block-close            -- statement block close
+ statement              -- a VHDL statement
+ statement-cont         -- a continuation of a VHDL statement
+ statement-block-intro  -- the first line in a new statement block
+ statement-case-intro   -- the first line in a case alternative block
+ case-alternative       -- a case statement alternative clause
+ comment                -- a line containing only a comment
+ arglist-intro          -- the first line in an argument list
+ arglist-cont           -- subsequent argument list lines when no
+                           arguments follow on the same line as the
+                           the arglist opening paren
+ arglist-cont-nonempty  -- subsequent argument list lines when at
+                           least one argument follows on the same
+                           line as the arglist opening paren
+ arglist-close          -- the solo close paren of an argument list
+ entity                 -- inside an entity declaration
+ configuration          -- inside a configuration declaration
+ package                -- inside a package declaration
+ architecture           -- inside an architecture body
+ package-body           -- inside a package body
+")
+
+(defvar vhdl-tab-always-indent t
+  "*Controls the operation of the TAB key.
+If t, hitting TAB always just indents the current line.  If nil,
+hitting TAB indents the current line if point is at the left margin or
+in the line's indentation, otherwise it insert a real tab character.
+If other than nil or t, then tab is inserted only within literals
+-- defined as comments and strings -- and inside preprocessor
+directives, but line is always reindented.
+
+Note that indentation of lines containing only comments is also
+controlled by the `vhdl-comment-only-line-offset' variable.")
+
+(defvar vhdl-comment-only-line-offset 0
+  "*Extra offset for line which contains only the start of a comment.
+Can contain an integer or a cons cell of the form:
+
+ (NON-ANCHORED-OFFSET . ANCHORED-OFFSET)
+
+Where NON-ANCHORED-OFFSET is the amount of offset given to
+non-column-zero anchored comment-only lines, and ANCHORED-OFFSET is
+the amount of offset to give column-zero anchored comment-only lines.
+Just an integer as value is equivalent to (<val> . 0)")
+
+(defvar vhdl-special-indent-hook nil
+  "*Hook for user defined special indentation adjustments.
+This hook gets called after a line is indented by the mode.")
+
+(defvar vhdl-style-alist
+  '(("IEEE"
+     (vhdl-basic-offset . 4)
+     (vhdl-offsets-alist . ())
+     )
+    )
+  "Styles of Indentation.
+Elements of this alist are of the form:
+
+  (STYLE-STRING (VARIABLE . VALUE) [(VARIABLE . VALUE) ...])
+
+where STYLE-STRING is a short descriptive string used to select a
+style, VARIABLE is any vhdl-mode variable, and VALUE is the intended
+value for that variable when using the selected style.
+
+There is one special case when VARIABLE is `vhdl-offsets-alist'.  In this
+case, the VALUE is a list containing elements of the form:
+
+  (SYNTACTIC-SYMBOL . VALUE)
+
+as described in `vhdl-offsets-alist'.  These are passed directly to
+`vhdl-set-offset' so there is no need to set every syntactic symbol in
+your style, only those that are different from the default.")
+
+;; dynamically append the default value of most variables
+(or (assoc "Default" vhdl-style-alist)
+    (let* ((varlist '(vhdl-inhibit-startup-warnings-p
+		      vhdl-strict-syntax-p
+		      vhdl-echo-syntactic-information-p
+		      vhdl-basic-offset
+		      vhdl-offsets-alist
+		      vhdl-tab-always-indent
+		      vhdl-comment-only-line-offset))
+	   (default (cons "Default"
+			  (mapcar
+			   (function
+			    (lambda (var)
+			      (cons var (symbol-value var))
+			      ))
+			   varlist))))
+      (setq vhdl-style-alist (cons default vhdl-style-alist))))
+
+(defvar vhdl-mode-hook nil
+  "*Hook called by `vhdl-mode'.")
+
+(defvar vhdl-mode-menu
+  '(["Comment Out Region"     comment-region (mark)]
+    ;; ["Indent Expression"      vhdl-indent-exp
+    ;; (memq (following-char) '(?\( ?\[ ?\{))]
+    ["Indent Line"            vhdl-indent-command t]
+    ["Backward Statement"     vhdl-beginning-of-statement t]
+    ;; ["Forward Statement"      vhdl-end-of-statement t]
+    )
+  "XEmacs 19 (formerly Lucid) menu for VHDL mode.")
+
+;; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+;; NO USER DEFINABLE VARIABLES BEYOND THIS POINT
+
+
+;; Emacs variant handling, and standard mode variables and functions:
+
+(defconst vhdl-emacs-features
+  (let ((major (and (boundp 'emacs-major-version)
+		    emacs-major-version))
+	(minor (and (boundp 'emacs-minor-version)
+		    emacs-minor-version))
+	flavor)
+    ;; figure out version numbers if not already discovered
+    (and (or (not major) (not minor))
+	 (string-match "\\([0-9]+\\).\\([0-9]+\\)" emacs-version)
+	 (setq major (string-to-int (substring emacs-version
+					       (match-beginning 1)
+					       (match-end 1)))
+	       minor (string-to-int (substring emacs-version
+					       (match-beginning 2)
+					       (match-end 2)))))
+    (if (not (and major minor))
+	(error "Cannot figure out the major and minor version numbers."))
+    ;; calculate the major version
+    (cond
+     ((= major 18) (setq major 'v18))	;Emacs 18
+     ((= major 4)  (setq major 'v18))	;Epoch 4
+     ((= major 19) (setq major 'v19	;Emacs 19
+			 flavor (cond
+				 ((string-match "Win-Emacs" emacs-version)
+				  'Win-Emacs)
+				 ((or (string-match "Lucid" emacs-version)
+				      (string-match "XEmacs" emacs-version))
+				  'XEmacs)
+				 (t
+				  'FSF))))
+     ;; I don't know
+     (t (error "Cannot recognize major version number: %s" major)))
+    ;; lets do some minimal sanity checking.
+    (if (and (or
+	      ;; Emacs 18 is brain dead
+	      (eq major 'v18)
+	      ;; Lemacs before 19.6 had bugs
+	      (and (eq major 'v19) (eq flavor 'XEmacs) (< minor 6))
+	      ;; FSF 19 before 19.21 had bugs
+	      (and (eq major 'v19) (eq flavor 'FSF) (< minor 21)))
+	     (not vhdl-inhibit-startup-warnings-p))
+	(with-output-to-temp-buffer "*vhdl-mode warnings*"
+	  (print (format
+"The version of Emacs that you are running, %s,
+has known bugs in its syntax.c parsing routines which will affect the
+performance of vhdl-mode. You should strongly consider upgrading to the
+latest available version.  vhdl-mode may continue to work, after a
+fashion, but strange indentation errors could be encountered."
+		     emacs-version))))
+    (list major flavor))
+  "A list of features extant in the Emacs you are using.
+There are many flavors of Emacs out there, each with different
+features supporting those needed by vhdl-mode.  Here's the current
+supported list, along with the values for this variable:
+
+ Emacs 18/Epoch 4:           (v18)
+ XEmacs (formerly Lucid) 19: (v19 XEmacs)
+ Win-Emacs 1.35:             (V19 Win-Emacs)
+ FSF Emacs 19:               (v19 FSF).")
+
+(defvar vhdl-mode-abbrev-table nil
+  "Abbrev table in use in vhdl-mode buffers.")
+(define-abbrev-table 'vhdl-mode-abbrev-table ())
+
+(defvar vhdl-mode-map ()
+  "Keymap used in vhdl-mode buffers.")
+(if vhdl-mode-map
+    ()
+  ;; TBD: should we even worry about naming this keymap. My vote: no,
+  ;; because FSF and XEmacs (formerly Lucid) do it differently.
+  (setq vhdl-mode-map (make-sparse-keymap))
+  ;; put standard keybindings into MAP
+  (define-key vhdl-mode-map "\M-a"	'vhdl-beginning-of-statement)
+  ;;(define-key vhdl-mode-map "\M-e"	'vhdl-end-of-statement)
+  (define-key vhdl-mode-map "\M-\C-f"   'vhdl-forward-sexp)
+  (define-key vhdl-mode-map "\M-\C-b"   'vhdl-backward-sexp)
+  (define-key vhdl-mode-map "\M-\C-u"	'vhdl-backward-up-list)
+  ;;(define-key vhdl-mode-map "\M-\C-d"	'vhdl-down-list)
+  (define-key vhdl-mode-map "\M-\C-a"	'vhdl-beginning-of-defun)
+  (define-key vhdl-mode-map "\M-\C-e"	'vhdl-end-of-defun)
+  (define-key vhdl-mode-map "\M-\C-h"	'vhdl-mark-defun)
+  (define-key vhdl-mode-map "\M-\C-q"	'vhdl-indent-sexp)
+  (define-key vhdl-mode-map "\t"        'vhdl-indent-command)
+  (define-key vhdl-mode-map "\177"      'backward-delete-char-untabify)
+  ;; these are new keybindings, with no counterpart to BOCM
+  (define-key vhdl-mode-map "\C-c\C-b"  'vhdl-submit-bug-report)
+  (define-key vhdl-mode-map "\C-c\C-c"  'comment-region)
+  (define-key vhdl-mode-map "\C-c\C-o"  'vhdl-set-offset)
+  (define-key vhdl-mode-map "\C-c\C-r"  'vhdl-regress-line)
+  (define-key vhdl-mode-map "\C-c\C-s"  'vhdl-show-syntactic-information)
+  (define-key vhdl-mode-map "\C-c\C-v"  'vhdl-version)
+  ;; in XEmacs (formerly Lucid) 19, we want the menu to popup when
+  ;; the 3rd button is hit.  In 19.10 and beyond this is done
+  ;; automatically if we put the menu on mode-popup-menu variable,
+  ;; see c-common-init. RMS decided that this feature should not be
+  ;; included for FSF's Emacs.
+  (if (and (boundp 'current-menubar)
+	   (not (boundp 'mode-popup-menu)))
+      (define-key vhdl-mode-map 'button3 'vhdl-popup-menu))
+  )
+
+(defvar vhdl-mode-syntax-table nil
+  "Syntax table used in vhdl-mode buffers.")
+(if vhdl-mode-syntax-table
+    ()
+  (setq vhdl-mode-syntax-table (make-syntax-table))
+  ;; DO NOT TRY TO SET _ (UNDERSCORE) TO WORD CLASS!
+  (modify-syntax-entry ?\" "\""    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\$ "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\% "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\& "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\' "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\( "()"    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\) ")("    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\* "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\+ "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\. "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\/ "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\: "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\; "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\< "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\= "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\> "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\[ "(]"    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\\ "\\"    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\] ")["    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\{ "(}"    vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\| "."     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\} "){"    vhdl-mode-syntax-table)
+  ;; add comment syntax
+  (modify-syntax-entry ?\- ". 12"  vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\n ">"     vhdl-mode-syntax-table)
+  (modify-syntax-entry ?\^M ">"    vhdl-mode-syntax-table))
+
+(defvar vhdl-syntactic-context nil
+  "Buffer local variable containing syntactic analysis list.")
+(make-variable-buffer-local 'vhdl-syntactic-context)
+
+;; Support for outline modes
+
+(defconst vhdl-outline-regexp
+  (concat "\\(entity\\)\\|\\(package\\)\\|"
+	  "\\( *procedure\\)\\|\\( *function\\)\\|"
+	  "\\( *component\\)\\|\\(architecture\\)\\|"
+	  "\\(package body\\)\\|\\( *[A-Za-z][A-Za-z0-9_]* : block\\)\\|"
+	  "\\( *[A-Za-z][A-Za-z0-9_]* : process\\)\\|\\(configuration\\)"))
+
+(defun vhdl-outline-level ()		; was copied from c-outline-level
+  (save-excursion
+    (skip-chars-forward "\t ")
+    (current-column)))
+
+;; Support for font-lock
+
+(defconst vhdl-font-lock-keywords-1
+  (purecopy
+   (list
+    ;; Highlight names of common constructs
+    (list
+     (concat
+      "^[ \t]*\\(entity\\|architecture\\|configuration\\|function\\|"
+      "procedure\\|component\\|package[ \t]+body\\|package\\|"
+      "end[ \t]+\\(block\\|process\\|case\\|generate\\|loop\\)\\)[ \t]+"
+      "\\(\\(\\w\\|\\s_\\)+\\)")
+     3 'font-lock-function-name-face)
+    
+    ;; Highlight labels of common constructs
+    (list
+     (concat
+      "^[ \t]*\\(\\(\\w\\|\\s_\\)+\\)[ \t]*:[ \t\n]*\\(block\\|process\\|"
+      "if\\|for\\|case\\|exit\\|loop\\|next\\|null\\|with\\|"
+      "\\(\\w\\|\\s_\\)+[ \t\n]+port[ \t]+map\\)\\>[^_]")
+     1 'font-lock-function-name-face)
+    
+    ;; Highlight OF labels
+    (list
+     (concat
+      "^[ \t]*\\(configuration\\|architecture\\|attribute\\)[ \t]+"
+      "\\(\\(\\w\\|\\s_\\)+\\)[ \t]+of[ \t]+\\(\\(\\w\\|\\s_\\)+\\)")
+     4 'font-lock-function-name-face)
+    
+    ;; Fontify library useage clauses.
+    (list
+     (concat
+      "[^\\s_]\\<\\(library\\|use\\)[ \t\n]+\\(entity[ \t\n]+\\)?"
+      "\\(\\(\\w\\|\\s_\\|[\.()]\\)+\\)")
+     3 'font-lock-function-name-face)
+    ))
+  "For consideration as a value of `vhdl-font-lock-keywords'.
+This does fairly subdued highlighting of function names.")
+
+(defconst vhdl-font-lock-keywords-2
+  (purecopy
+   (append
+    vhdl-font-lock-keywords-1
+    (list
+     (list
+      (concat
+       "[^\\s_]\\<\\("
+       (mapconcat
+	'identity
+	'(
+	  ;; the following is a list of all reserved words known in VHDL'93
+	  "abs" "access" "after" "alias" "all" "and" "assert"
+	  "architecture" "array" "attribute"
+	  "begin" "block" "body" "buffer" "bus"
+	  "case" "component" "configuration" "constant"
+	  "disconnect" "downto"
+	  "else" "elsif" "end" "entity" "exit"
+	  "file" "for" "function"
+	  "generate" "generic" "group" "guarded"
+	  "if" "impure" "in" "inertial" "inout" "is"
+	  "label" "library" "linkage" "literal" "loop" 
+	  "map" "mod" 
+	  "nand" "new" "next" "nor" "not" "null"
+	  "of" "on" "open" "or" "others" "out"
+	  "package" "port" "postponed" "procedure" "process" "pure"
+	  "range" "record" "register" "reject" "rem" "report" "return"
+	  "rol" "ror"
+	  "select" "severity" "signal" "shared" "sla" "sll" "sra" "srl"
+	  "subtype"
+	  "then" "to" "transport" "type" 
+	  "unaffected" "units" "until" "use"
+	  "variable" "wait" "when" "while" "with" 
+	  "xnor" "xor"
+	  "note" "warning" "error" "failure"
+	  ;; the following list contains predefined attributes
+	  "base" "left" "right" "high" "low" "pos" "val" "succ"
+	  "pred" "leftof" "rightof" "range" "reverse_range"
+	  "length" "delayed" "stable" "quiet" "transaction"
+	  "event" "active" "last_event" "last_active" "last_value"
+	  "driving" "driving_value" "ascending" "value" "image"
+	  "simple_name" "instance_name" "path_name"
+	  "foreign"
+	  ;; the following list contains standardized types
+	  "boolean" "bit" "bit_vector" "character" "severity_level" "integer"
+	  "real" "time" "natural" "positive" "string" "text" "line"
+	  "unsigned" "signed"
+	  "std_logic" "std_logic_vector"
+	  "std_ulogic" "std_ulogic_vector"
+	  )
+	"\\|")
+       "\\)\\>[^\\s_]")
+      1 'font-lock-keyword-face)
+     )))
+  "For consideration as a value of `vhdl-font-lock-keywords'.
+This does a lot more highlighting.")
+
+;; The keywords in the preceding lists assume case-insensitivity.
+(put 'vhdl-mode 'font-lock-keywords-case-fold-search t)
+
+(defvar vhdl-font-lock-keywords vhdl-font-lock-keywords-1
+  "Additional expressions to highlight in VHDL mode.")
+
+;; This should eventually be subsumed into the respective functions in
+;; the source for "font-lock.el".
+(if (featurep 'advice)
+    (progn
+      (defadvice font-lock-use-default-minimal-decoration
+	(before vhdl-mode activate)
+	"Do it for VHDL mode too."
+	(setq vhdl-font-lock-keywords vhdl-font-lock-keywords-1))
+      
+      (defadvice font-lock-use-default-maximal-decoration
+	(before vhdl-mode activate)
+	"Do it for VHDL mode too."
+	(setq vhdl-font-lock-keywords vhdl-font-lock-keywords-2))
+      ))
+
+
+;; Main entry point for VHDL mode:
+
+;;;###autoload
+(defun vhdl-mode ()
+  "Major mode for editing VHDL code.
+vhdl-mode $Revision: 1.1 $
+To submit a problem report, enter `\\[vhdl-submit-bug-report]' from a
+vhdl-mode buffer.  This automatically sets up a mail buffer with version
+information already added.  You just need to add a description of the
+problem, including a reproducable test case and send the message.
+
+Note that the details of configuring vhdl-mode will soon be moved to the
+accompanying texinfo manual.  Until then, please read the README file
+that came with the vhdl-mode distribution.
+
+The hook variable `vhdl-mode-hook' is run with no args, if that value is
+bound and has a non-nil value.
+
+Key bindings:
+\\{vhdl-mode-map}"
+  (interactive)
+  (kill-all-local-variables)
+  (set-syntax-table vhdl-mode-syntax-table)
+  (setq major-mode 'vhdl-mode
+	mode-name "VHDL"
+	local-abbrev-table vhdl-mode-abbrev-table)
+  (use-local-map vhdl-mode-map)
+  ;; set local variable values
+  (set (make-local-variable 'paragraph-start) (concat "^$\\|" page-delimiter))
+  (set (make-local-variable 'paragraph-separate) paragraph-start)
+  (set (make-local-variable 'paragraph-ignore-fill-prefix) t)
+  (set (make-local-variable 'require-final-newline) t)
+  (set (make-local-variable 'parse-sexp-ignore-comments) t)
+  (set (make-local-variable 'indent-line-function) 'vhdl-indent-line)
+  (set (make-local-variable 'comment-start) "-- ")
+  (set (make-local-variable 'comment-end) "")
+  (set (make-local-variable 'comment-column) 32)
+  (set (make-local-variable 'comment-start-skip) "--+ *")
+  (set (make-local-variable 'outline-regexp) vhdl-outline-regexp)
+  (set (make-local-variable 'outline-level) 'vhdl-outline-level)
+
+  ;; setup the comment indent variable in a Emacs version portable way
+  ;; ignore any byte compiler warnings you might get here
+  (if (boundp 'comment-indent-function)
+      (progn
+	   (make-local-variable 'comment-indent-function)
+	   (setq comment-indent-function 'vhdl-comment-indent))
+    (make-local-variable 'comment-indent-hook)
+    (setq comment-indent-hook 'vhdl-comment-indent))
+  ;; put VHDL menu into menubar and on popup menu for XEmacs (formerly
+  ;; Lucid) 19. I think this happens automatically for FSF Emacs 19.
+  (if (and (boundp 'current-menubar)
+	   current-menubar
+	   (not (assoc mode-name current-menubar)))
+      (progn
+	(set-buffer-menubar (copy-sequence current-menubar))
+	(add-menu nil mode-name vhdl-mode-menu)))
+  (if (boundp 'mode-popup-menu)
+      (setq mode-popup-menu
+	    (cons (concat mode-name " Mode Commands") vhdl-mode-menu)))
+  (run-hooks 'vhdl-mode-hook))
+
+;; menus for XEmacs (formerly Lucid)
+
+(defun vhdl-popup-menu (e)
+  "Pops up the VHDL menu."
+  (interactive "@e")
+  (popup-menu (cons (concat mode-name " Mode Commands") vhdl-mode-menu))
+  (vhdl-keep-region-active))
+
+;; active regions
+
+(defun vhdl-keep-region-active ()
+  ;; do whatever is necessary to keep the region active in XEmacs
+  ;; (formerly Lucid). ignore byte-compiler warnings you might see
+  (and (boundp 'zmacs-region-stays)
+       (setq zmacs-region-stays t)))
+
+;; constant regular expressions for looking at various constructs
+
+(defconst vhdl-symbol-key "\\(\\w\\|\\s_\\)+"
+  "Regexp describing a VHDL symbol.
+We cannot use just `word' syntax class since `_' cannot be in word
+class.  Putting underscore in word class breaks forward word movement
+behavior that users are familiar with.")
+
+(defconst vhdl-case-alternative-key "when[( \t\n][^;=>]+=>"
+  "Regexp describing a case statement alternative key.")
+
+(defconst vhdl-case-header-key "case[( \t\n][^;=>]+[) \t\n]is"
+  "Regexp describing a case statement header key.")
+
+(defconst vhdl-label-key
+  (concat vhdl-symbol-key "\\s-*:")
+  "Regexp describing a VHDL label.")
+
+
+;; Macro definitions:
+
+(defmacro vhdl-point (position)
+  ;; Returns the value of point at certain commonly referenced POSITIONs.
+  ;; POSITION can be one of the following symbols:
+  ;; 
+  ;; bol  -- beginning of line
+  ;; eol  -- end of line
+  ;; bod  -- beginning of defun
+  ;; boi  -- back to indentation
+  ;; eoi  -- last whitespace on line
+  ;; ionl -- indentation of next line
+  ;; iopl -- indentation of previous line
+  ;; bonl -- beginning of next line
+  ;; bopl -- beginning of previous line
+  ;; 
+  ;; This function does not modify point or mark.
+  (or (and (eq 'quote (car-safe position))
+	   (null (cdr (cdr position))))
+      (error "bad buffer position requested: %s" position))
+  (setq position (nth 1 position))
+  (` (let ((here (point)))
+       (,@ (cond
+	    ((eq position 'bol)  '((beginning-of-line)))
+	    ((eq position 'eol)  '((end-of-line)))
+	    ((eq position 'bod)  '((save-match-data
+				     (vhdl-beginning-of-defun))))
+	    ((eq position 'boi)  '((back-to-indentation)))
+	    ((eq position 'eoi)  '((end-of-line)(skip-chars-backward " \t")))
+	    ((eq position 'bonl) '((forward-line 1)))
+	    ((eq position 'bopl) '((forward-line -1)))
+	    ((eq position 'iopl)
+	     '((forward-line -1)
+	       (back-to-indentation)))
+	    ((eq position 'ionl)
+	     '((forward-line 1)
+	       (back-to-indentation)))
+	    (t (error "unknown buffer position requested: %s" position))
+	    ))
+       (prog1
+	   (point)
+	 (goto-char here))
+       ;; workaround for an Emacs18 bug -- blech! Well, at least it
+       ;; doesn't hurt for v19
+       (,@ nil)
+       )))
+
+(defmacro vhdl-safe (&rest body)
+  ;; safely execute BODY, return nil if an error occurred
+  (` (condition-case nil
+	 (progn (,@ body))
+       (error nil))))
+
+(defmacro vhdl-add-syntax (symbol &optional relpos)
+  ;; a simple macro to append the syntax in symbol to the syntax list.
+  ;; try to increase performance by using this macro
+  (` (setq vhdl-syntactic-context
+	   (cons (cons (, symbol) (, relpos)) vhdl-syntactic-context))))
+
+(defmacro vhdl-has-syntax (symbol)
+  ;; a simple macro to return check the syntax list.
+  ;; try to increase performance by using this macro
+  (` (assoc (, symbol) vhdl-syntactic-context)))
+
+
+;; Syntactic element offset manipulation:
+
+(defun vhdl-read-offset (langelem)
+  ;; read new offset value for LANGELEM from minibuffer. return a
+  ;; legal value only
+  (let ((oldoff (format "%s" (cdr-safe (assq langelem vhdl-offsets-alist))))
+	(errmsg "Offset must be int, func, var, or one of +, -, ++, --: ")
+	(prompt "Offset: ")
+	offset input interned)
+    (while (not offset)
+      (setq input (read-string prompt oldoff)
+	    offset (cond ((string-equal "+" input) '+)
+			 ((string-equal "-" input) '-)
+			 ((string-equal "++" input) '++)
+			 ((string-equal "--" input) '--)
+			 ((string-match "^-?[0-9]+$" input)
+			  (string-to-int input))
+			 ((fboundp (setq interned (intern input)))
+			  interned)
+			 ((boundp interned) interned)
+			 ;; error, but don't signal one, keep trying
+			 ;; to read an input value
+			 (t (ding)
+			    (setq prompt errmsg)
+			    nil))))
+    offset))
+
+(defun vhdl-set-offset (symbol offset &optional add-p)
+  "Change the value of a syntactic element symbol in `vhdl-offsets-alist'.
+SYMBOL is the syntactic element symbol to change and OFFSET is the new
+offset for that syntactic element.  Optional ADD says to add SYMBOL to
+`vhdl-offsets-alist' if it doesn't already appear there."
+  (interactive
+   (let* ((langelem
+	   (intern (completing-read
+		    (concat "Syntactic symbol to change"
+			    (if current-prefix-arg " or add" "")
+			    ": ")
+		    (mapcar
+		     (function
+		      (lambda (langelem)
+			(cons (format "%s" (car langelem)) nil)))
+		     vhdl-offsets-alist)
+		    nil (not current-prefix-arg)
+		    ;; initial contents tries to be the last element
+		    ;; on the syntactic analysis list for the current
+		    ;; line
+		    (let* ((syntax (vhdl-get-syntactic-context))
+			   (len (length syntax))
+			   (ic (format "%s" (car (nth (1- len) syntax)))))
+		      (if (memq 'v19 vhdl-emacs-features)
+			  (cons ic 0)
+			ic))
+		    )))
+	  (offset (vhdl-read-offset langelem)))
+     (list langelem offset current-prefix-arg)))
+  ;; sanity check offset
+  (or (eq offset '+)
+      (eq offset '-)
+      (eq offset '++)
+      (eq offset '--)
+      (integerp offset)
+      (fboundp offset)
+      (boundp offset)
+      (error "Offset must be int, func, var, or one of +, -, ++, --: %s"
+	     offset))
+  (let ((entry (assq symbol vhdl-offsets-alist)))
+    (if entry
+	(setcdr entry offset)
+      (if add-p
+	  (setq vhdl-offsets-alist (cons (cons symbol offset) vhdl-offsets-alist))
+	(error "%s is not a valid syntactic symbol." symbol))))
+  (vhdl-keep-region-active))
+
+(defun vhdl-set-style (style &optional local)
+  "Set vhdl-mode variables to use one of several different indentation styles.
+STYLE is a string representing the desired style and optional LOCAL is
+a flag which, if non-nil, means to make the style variables being
+changed buffer local, instead of the default, which is to set the
+global variables.  Interactively, the flag comes from the prefix
+argument.  The styles are chosen from the `vhdl-style-alist' variable."
+  (interactive (list (completing-read "Use which VHDL indentation style? "
+                                      vhdl-style-alist nil t)
+		     current-prefix-arg))
+  (let ((vars (cdr (assoc style vhdl-style-alist))))
+    (or vars
+	(error "Invalid VHDL indentation style `%s'" style))
+    ;; set all the variables
+    (mapcar
+     (function
+      (lambda (varentry)
+	(let ((var (car varentry))
+	      (val (cdr varentry)))
+	  (and local
+	       (make-local-variable var))
+	  ;; special case for vhdl-offsets-alist
+	  (if (not (eq var 'vhdl-offsets-alist))
+	      (set var val)
+	    ;; reset vhdl-offsets-alist to the default value first
+	    (setq vhdl-offsets-alist (copy-alist vhdl-offsets-alist-default))
+	    ;; now set the langelems that are different
+	    (mapcar
+	     (function
+	      (lambda (langentry)
+		(let ((langelem (car langentry))
+		      (offset (cdr langentry)))
+		  (vhdl-set-offset langelem offset)
+		  )))
+	     val))
+	  )))
+     vars))
+  (vhdl-keep-region-active))
+
+(defun vhdl-get-offset (langelem)
+  ;; Get offset from LANGELEM which is a cons cell of the form:
+  ;; (SYMBOL . RELPOS).  The symbol is matched against
+  ;; vhdl-offsets-alist and the offset found there is either returned,
+  ;; or added to the indentation at RELPOS.  If RELPOS is nil, then
+  ;; the offset is simply returned.
+  (let* ((symbol (car langelem))
+	 (relpos (cdr langelem))
+	 (match  (assq symbol vhdl-offsets-alist))
+	 (offset (cdr-safe match)))
+    ;; offset can be a number, a function, a variable, or one of the
+    ;; symbols + or -
+    (cond
+     ((not match)
+      (if vhdl-strict-syntax-p
+	  (error "don't know how to indent a %s" symbol)
+	(setq offset 0
+	      relpos 0)))
+     ((eq offset '+)  (setq offset vhdl-basic-offset))
+     ((eq offset '-)  (setq offset (- vhdl-basic-offset)))
+     ((eq offset '++) (setq offset (* 2 vhdl-basic-offset)))
+     ((eq offset '--) (setq offset (* 2 (- vhdl-basic-offset))))
+     ((and (not (numberp offset))
+	   (fboundp offset))
+      (setq offset (funcall offset langelem)))
+     ((not (numberp offset))
+      (setq offset (eval offset)))
+     )
+    (+ (if (and relpos
+		(< relpos (vhdl-point 'bol)))
+	   (save-excursion
+	     (goto-char relpos)
+	     (current-column))
+	 0)
+       offset)))
+
+
+;; Syntactic support functions:
+
+;; Returns `comment' if in a comment, `string' if in a string literal,
+;; or nil if not in a literal at all.  Optional LIM is used as the
+;; backward limit of the search.  If omitted, or nil, (point-min) is
+;; used.
+
+(defun vhdl-in-literal (&optional lim)
+  ;; Determine if point is in a VHDL literal.
+  (save-excursion
+    (let* ((lim (or lim (point-min)))
+	   (state (parse-partial-sexp lim (point))))
+      (cond
+       ((nth 3 state) 'string)
+       ((nth 4 state) 'comment)
+       (t nil)))
+    ))
+
+;; This is the best we can do in Win-Emacs.
+(defun vhdl-win-il (&optional lim)
+  ;; Determine if point is in a VHDL literal
+  (save-excursion
+    (let* ((here (point))
+	   (state nil)
+	   (match nil)
+	   (lim  (or lim (vhdl-point 'bod))))
+      (goto-char lim )
+      (while (< (point) here)
+	(setq match
+	      (and (re-search-forward "--\\|[\"']"
+				      here 'move)
+		   (buffer-substring (match-beginning 0) (match-end 0))))
+	(setq state
+	      (cond
+	       ;; no match
+	       ((null match) nil)
+	       ;; looking at the opening of a VHDL style comment
+	       ((string= "--" match)
+		(if (<= here (progn (end-of-line) (point))) 'comment))
+	       ;; looking at the opening of a double quote string
+	       ((string= "\"" match)
+		(if (not (save-restriction
+			   ;; this seems to be necessary since the
+			   ;; re-search-forward will not work without it
+			   (narrow-to-region (point) here)
+			   (re-search-forward
+			    ;; this regexp matches a double quote
+			    ;; which is preceded by an even number
+			    ;; of backslashes, including zero
+			    "\\([^\\]\\|^\\)\\(\\\\\\\\\\)*\"" here 'move)))
+		    'string))
+	       ;; looking at the opening of a single quote string
+	       ((string= "'" match)
+		(if (not (save-restriction
+			   ;; see comments from above
+			   (narrow-to-region (point) here)
+			   (re-search-forward
+			    ;; this matches a single quote which is
+			    ;; preceded by zero or two backslashes.
+			    "\\([^\\]\\|^\\)\\(\\\\\\\\\\)?'"
+			    here 'move)))
+		    'string))
+	       (t nil)))
+	) ; end-while
+      state)))
+
+(and (memq 'Win-Emacs vhdl-emacs-features)
+     (fset 'vhdl-in-literal 'vhdl-win-il))
+
+;; Skipping of "syntactic whitespace".  Syntactic whitespace is
+;; defined as lexical whitespace or comments.  Search no farther back
+;; or forward than optional LIM.  If LIM is omitted, (point-min) is
+;; used for backward skipping, (point-max) is used for forward
+;; skipping.
+
+(defun vhdl-forward-syntactic-ws (&optional lim)
+  ;; Forward skip of syntactic whitespace.
+  (save-restriction
+    (let* ((lim (or lim (point-max)))
+	   (here lim)
+	   (hugenum (point-max)))
+      (narrow-to-region lim (point))
+      (while (/= here (point))
+	(setq here (point))
+	(forward-comment hugenum))
+      )))
+
+;; This is the best we can do in Win-Emacs.
+(defun vhdl-win-fsws (&optional lim)
+  ;; Forward skip syntactic whitespace for Win-Emacs.
+  (let ((lim (or lim (point-max)))
+	stop)
+    (while (not stop)
+      (skip-chars-forward " \t\n\r\f" lim)
+      (cond
+       ;; vhdl comment
+       ((looking-at "--") (end-of-line))
+       ;; none of the above
+       (t (setq stop t))
+       ))))
+
+(and (memq 'Win-Emacs vhdl-emacs-features)
+     (fset 'vhdl-forward-syntactic-ws 'vhdl-win-fsws))
+
+(defun vhdl-backward-syntactic-ws (&optional lim)
+  ;; Backward skip over syntactic whitespace.
+  (save-restriction
+    (let* ((lim (or lim (point-min)))
+	   (here lim)
+	   (hugenum (- (point-max))))
+      (if (< lim (point))
+	  (progn
+	    (narrow-to-region lim (point))
+	    (while (/= here (point))
+	      (setq here (point))
+	      (forward-comment hugenum)
+	      )))
+      )))
+
+;; This is the best we can do in Win-Emacs.
+(defun vhdl-win-bsws (&optional lim)
+  ;; Backward skip syntactic whitespace for Win-Emacs.
+  (let ((lim (or lim (vhdl-point 'bod)))
+	stop)
+    (while (not stop)
+      (skip-chars-backward " \t\n\r\f" lim)
+      (cond
+       ;; vhdl comment
+       ((eq (vhdl-in-literal lim) 'comment)
+	(skip-chars-backward "^-" lim)
+	(skip-chars-backward "-" lim)
+	(while (not (or (and (= (following-char) ?-)
+			     (= (char-after (1+ (point))) ?-))
+			(<= (point) lim)))
+	  (skip-chars-backward "^-" lim)
+	  (skip-chars-backward "-" lim)))
+       ;; none of the above
+       (t (setq stop t))
+       ))))
+
+(and (memq 'Win-Emacs vhdl-emacs-features)
+    (fset 'vhdl-backward-syntactic-ws 'vhdl-win-bsws))
+
+;; Functions to help finding the correct indentation column:
+
+(defun vhdl-first-word (point)
+  "If the keyword at POINT is at boi, then return (current-column) at
+that point, else nil."
+  (save-excursion
+    (and (goto-char point)
+	 (eq (point) (vhdl-point 'boi))
+	 (current-column))))
+
+(defun vhdl-last-word (point)
+  "If the keyword at POINT is at eoi, then return (current-column) at
+that point, else nil."
+  (save-excursion
+    (and (goto-char point)
+	 (save-excursion (or (eq (progn (forward-sexp) (point))
+				 (vhdl-point 'eoi))
+			     (looking-at "\\s-*\\(--\\)?")))
+	 (current-column))))
+
+
+;; Core syntactic evaluation functions:
+
+(defconst vhdl-libunit-re
+  "\\b\\(architecture\\|configuration\\|entity\\|package\\)\\b[^_]")
+
+(defun vhdl-libunit-p ()
+  (and
+   (save-excursion
+     (forward-sexp)
+     (skip-chars-forward " \t\n")
+     (not (looking-at "is\\b[^_]")))
+   (save-excursion
+     (backward-sexp)
+     (not (looking-at "use\\b[^_]")))))
+
+(defconst vhdl-defun-re
+  "\\b\\(architecture\\|block\\|configuration\\|entity\\|package\\|process\\|procedure\\|function\\)\\b[^_]")
+
+(defun vhdl-defun-p ()
+  (save-excursion
+    (if (looking-at "block\\|process")
+	;; "block", "process":
+	(save-excursion
+	  (backward-sexp)
+	  (not (looking-at "end\\s-+\\w")))
+      ;; "architecture", "configuration", "entity",
+      ;; "package", "procedure", "function":
+      t)))
+  
+(defun vhdl-corresponding-defun ()
+  "If the word at the current position corresponds to a \"defun\"
+keyword, then return a string that can be used to find the
+corresponding \"begin\" keyword, else return nil."
+  (save-excursion
+    (and (looking-at vhdl-defun-re)
+	 (vhdl-defun-p)
+	 (if (looking-at "block\\|process")
+	     ;; "block", "process":
+	     (buffer-substring (match-beginning 0) (match-end 0))
+	   ;; "architecture", "configuration", "entity", "package",
+	   ;; "procedure", "function":
+	   "is"))))
+
+(defconst vhdl-begin-fwd-re
+  "\\b\\(is\\|begin\\|block\\|component\\|generate\\|then\\|else\\|loop\\|process\\|units\\|record\\|for\\)\\b\\([^_]\\|\\'\\)"
+  "A regular expression for searching forward that matches all known
+\"begin\" keywords.")
+
+(defconst vhdl-begin-bwd-re
+  "\\b\\(is\\|begin\\|block\\|component\\|generate\\|then\\|else\\|loop\\|process\\|units\\|record\\|for\\)\\b"
+  "A regular expression for searching backward that matches all known
+\"begin\" keywords.")
+
+(defun vhdl-begin-p (&optional lim)
+  "Return t if we are looking at a real \"begin\" keyword.
+Assumes that the caller will make sure that we are looking at
+vhdl-begin-fwd-re, and are not inside a literal, and that we are not in
+the middle of an identifier that just happens to contain a \"begin\"
+keyword."
+  (cond
+   ;; "[architecture|case|configuration|entity|package|
+   ;;   procedure|function] ... is":
+   ((and (looking-at "i")
+	 (save-excursion
+	   ;; Skip backward over first sexp (needed to skip over a
+	   ;; procedure interface list, and is harmless in other
+	   ;; situations).  Note that we need "return" in the
+	   ;; following search list so that we don't run into
+	   ;; semicolons in the function interface list.
+	   (backward-sexp)
+	   (let (foundp)
+	     (while (and (not foundp)
+			 (re-search-backward
+			  ";\\|\\b\\(architecture\\|case\\|configuration\\|entity\\|package\\|procedure\\|return\\|is\\|begin\\|process\\|block\\)\\b[^_]"
+			  lim 'move))
+	       (if (or (= (preceding-char) ?_)
+		       (vhdl-in-literal lim))
+		   (backward-char)
+		 (setq foundp t))))
+	   (and (/= (following-char) ?\;)
+		(not (looking-at "is\\|begin\\|process\\|block")))))
+    t)
+   ;; "begin", "then":
+   ((looking-at "be\\|t")
+    t)
+   ;; "else":
+   ((and (looking-at "e")
+	 ;; make sure that the "else" isn't inside a
+	 ;; conditional signal assignment.
+	 (save-excursion
+	   (re-search-backward ";\\|\\bwhen\\b[^_]" lim 'move)
+	   (or (eq (following-char) ?\;)
+	       (eq (point) lim))))
+    t)
+   ;; "block", "component", "generate", "loop", "process",
+   ;; "units", "record":
+   ((and (looking-at "bl\\|[cglpur]")
+	 (save-excursion
+	   (backward-sexp)
+	   (not (looking-at "end\\s-+\\w"))))
+    t)
+   ;; "for" (inside configuration declaration):
+   ((and (looking-at "f")
+	 (save-excursion
+	   (backward-sexp)
+	   (not (looking-at "end\\s-+\\w")))
+	 (vhdl-has-syntax 'configuration))
+    t)
+   ))
+  
+(defun vhdl-corresponding-mid (&optional lim)
+  (cond
+   ((looking-at "is\\|block\\|process")
+    "begin")
+   ((looking-at "then")
+    "<else>")
+   (t
+    "end")))
+
+(defun vhdl-corresponding-end (&optional lim)
+  "If the word at the current position corresponds to a \"begin\"
+keyword, then return a vector containing enough information to find
+the corresponding \"end\" keyword, else return nil.  The keyword to
+search forward for is aref 0.  The column in which the keyword must
+appear is aref 1 or nil if any column is suitable.
+Assumes that the caller will make sure that we are not in the middle
+of an identifier that just happens to contain a \"begin\" keyword."
+  (save-excursion
+    (and (looking-at vhdl-begin-fwd-re)
+	 (/= (preceding-char) ?_)
+	 (not (vhdl-in-literal lim))
+	 (vhdl-begin-p lim)
+	 (cond
+	  ;; "is", "generate", "loop":
+	  ((looking-at "[igl]")
+	   (vector "end"
+		   (and (vhdl-last-word (point))
+			(or (vhdl-first-word (point))
+			    (save-excursion
+			      (vhdl-beginning-of-statement-1 lim)
+			      (vhdl-backward-skip-label lim)
+			      (vhdl-first-word (point)))))))
+	  ;; "begin", "else", "for":
+	  ((looking-at "be\\|[ef]")
+	   (vector "end"
+		   (and (vhdl-last-word (point))
+			(or (vhdl-first-word (point))
+			    (save-excursion
+			      (vhdl-beginning-of-statement-1 lim)
+			      (vhdl-backward-skip-label lim)
+			      (vhdl-first-word (point)))))))
+	  ;; "component", "units", "record":
+	  ((looking-at "[cur]")
+	   ;; The first end found will close the block
+	   (vector "end" nil))
+	  ;; "block", "process":
+	  ((looking-at "bl\\|p")
+	   (vector "end"
+		   (or (vhdl-first-word (point))
+		       (save-excursion
+			 (vhdl-beginning-of-statement-1 lim)
+			 (vhdl-backward-skip-label lim)
+			 (vhdl-first-word (point))))))
+	  ;; "then":
+	  ((looking-at "t")
+	   (vector "elsif\\|else\\|end"
+		   (and (vhdl-last-word (point))
+			(or (vhdl-first-word (point))
+			    (save-excursion
+			      (vhdl-beginning-of-statement-1 lim)
+			      (vhdl-backward-skip-label lim)
+			      (vhdl-first-word (point)))))))
+	  ))))
+
+(defconst vhdl-end-fwd-re "\\b\\(end\\|else\\|elsif\\)\\b\\([^_]\\|\\'\\)")
+
+(defconst vhdl-end-bwd-re "\\b\\(end\\|else\\|elsif\\)\\b")
+
+(defun vhdl-end-p (&optional lim)
+  "Return t if we are looking at a real \"end\" keyword.
+Assumes that the caller will make sure that we are looking at
+vhdl-end-fwd-re, and are not inside a literal, and that we are not in
+the middle of an identifier that just happens to contain an \"end\"
+keyword."
+  (or (not (looking-at "else"))
+      ;; make sure that the "else" isn't inside a conditional signal
+      ;; assignment.
+      (save-excursion
+	(re-search-backward ";\\|\\bwhen\\b[^_]" lim 'move)
+	(or (eq (following-char) ?\;)
+	    (eq (point) lim)))))
+
+(defun vhdl-corresponding-begin (&optional lim)
+  "If the word at the current position corresponds to an \"end\"
+keyword, then return a vector containing enough information to find
+the corresponding \"begin\" keyword, else return nil.  The keyword to
+search backward for is aref 0.  The column in which the keyword must
+appear is aref 1 or nil if any column is suitable.  The supplementary
+keyword to search forward for is aref 2 or nil if this is not
+required.  If aref 3 is t, then the \"begin\" keyword may be found in
+the middle of a statement.
+Assumes that the caller will make sure that we are not in the middle
+of an identifier that just happens to contain an \"end\" keyword."
+  (save-excursion
+    (let (pos)
+      (if (and (looking-at vhdl-end-fwd-re)
+	       (not (vhdl-in-literal lim))
+	       (vhdl-end-p lim))
+	  (if (looking-at "el")
+	      ;; "else", "elsif":
+	      (vector "if\\|elsif" (vhdl-first-word (point)) "then" nil)
+	    ;; "end ...":
+	    (setq pos (point))
+	    (forward-sexp)
+	    (skip-chars-forward " \t\n")
+	    (cond
+	     ;; "end if":
+	     ((looking-at "if\\b[^_]")
+	      (vector "else\\|elsif\\|if"
+		      (vhdl-first-word pos)
+		      "else\\|then" nil))
+	     ;; "end component":
+	     ((looking-at "component\\b[^_]")
+	      (vector (buffer-substring (match-beginning 1)
+					(match-end 1))
+		      (vhdl-first-word pos)
+		      nil nil))
+	     ;; "end units", "end record":
+	     ((looking-at "\\(units\\|record\\)\\b[^_]")
+	      (vector (buffer-substring (match-beginning 1)
+					(match-end 1))
+		      (vhdl-first-word pos)
+		      nil t))
+	     ;; "end block", "end process":
+	     ((looking-at "\\(block\\|process\\)\\b[^_]")
+	      (vector "begin" (vhdl-first-word pos) nil nil))
+	     ;; "end case":
+	     ((looking-at "case\\b[^_]")
+	      (vector "case" (vhdl-first-word pos) "is" nil))
+	     ;; "end generate":
+	     ((looking-at "generate\\b[^_]")
+	      (vector "generate\\|for\\|if"
+		      (vhdl-first-word pos)
+		      "generate" nil))
+	     ;; "end loop":
+	     ((looking-at "loop\\b[^_]")
+	      (vector "loop\\|while\\|for"
+		      (vhdl-first-word pos)
+		      "loop" nil))
+	     ;; "end for" (inside configuration declaration):
+	     ((looking-at "for\\b[^_]")
+	      (vector "for" (vhdl-first-word pos) nil nil))
+	     ;; "end [id]":
+	     (t
+	      (vector "begin\\|architecture\\|configuration\\|entity\\|package\\|procedure\\|function"
+		      (vhdl-first-word pos)
+		      ;; return an alist of (statement . keyword) mappings
+		      '(
+			;; "begin ... end [id]":
+			("begin"          . nil)
+			;; "architecture ... is ... begin ... end [id]":
+			("architecture"   . "is")
+			;; "configuration ... is ... end [id]":
+			("configuration"  . "is")
+			;; "entity ... is ... end [id]":
+			("entity"         . "is")
+			;; "package ... is ... end [id]":
+			("package"        . "is")
+			;; "procedure ... is ... begin ... end [id]":
+			("procedure"      . "is")
+			;; "function ... is ... begin ... end [id]":
+			("function"       . "is")
+			)
+		      nil))
+	     ))) ; "end ..."
+      )))
+
+(defconst vhdl-leader-re
+  "\\b\\(block\\|component\\|process\\|for\\)\\b[^_]")
+
+(defun vhdl-end-of-leader ()
+  (save-excursion
+    (cond ((looking-at "block\\|process")
+	   (if (save-excursion
+		 (forward-sexp)
+		 (skip-chars-forward " \t\n")
+		 (= (following-char) ?\())
+	       (forward-sexp 2)
+	     (forward-sexp))
+	   (point))
+	  ((looking-at "component")
+	   (forward-sexp 2)
+	   (point))
+	  ((looking-at "for")
+	   (forward-sexp 2)
+	   (skip-chars-forward " \t\n")
+	   (while (looking-at "[,:(]")
+	     (forward-sexp)
+	     (skip-chars-forward " \t\n"))
+	   (point))
+	  (t nil)
+	  )))
+
+(defconst vhdl-trailer-re
+  "\\b\\(is\\|then\\|generate\\|loop\\)\\b[^_]")
+
+(defconst vhdl-statement-fwd-re
+  "\\b\\(if\\|for\\|while\\)\\b\\([^_]\\|\\'\\)"
+  "A regular expression for searching forward that matches all known
+\"statement\" keywords.")
+
+(defconst vhdl-statement-bwd-re
+  "\\b\\(if\\|for\\|while\\)\\b"
+  "A regular expression for searching backward that matches all known
+\"statement\" keywords.")
+
+(defun vhdl-statement-p (&optional lim)
+  "Return t if we are looking at a real \"statement\" keyword.
+Assumes that the caller will make sure that we are looking at
+vhdl-statement-fwd-re, and are not inside a literal, and that we are not in
+the middle of an identifier that just happens to contain a \"statement\"
+keyword."
+  (cond
+   ;; "for" ... "generate":
+   ((and (looking-at "f")
+	 ;; Make sure it's the start of a parameter specification.
+	 (save-excursion
+	   (forward-sexp 2)
+	   (skip-chars-forward " \t\n")
+	   (looking-at "in\\b[^_]"))
+	 ;; Make sure it's not an "end for".
+	 (save-excursion
+	   (backward-sexp)
+	   (not (looking-at "end\\s-+\\w"))))
+    t)
+   ;; "if" ... "then", "if" ... "generate", "if" ... "loop":
+   ((and (looking-at "i")
+	 ;; Make sure it's not an "end if".
+	 (save-excursion
+	   (backward-sexp)
+	   (not (looking-at "end\\s-+\\w"))))
+    t)
+   ;; "while" ... "loop":
+   ((looking-at "w")
+    t)
+   ))
+  
+
+;; Core syntactic movement functions:
+
+(defconst vhdl-b-t-b-re
+  (concat vhdl-begin-bwd-re "\\|" vhdl-end-bwd-re))
+
+(defun vhdl-backward-to-block (&optional lim)
+  "Move backward to the previous \"begin\" or \"end\" keyword."
+  (let (foundp)
+    (while (and (not foundp)
+		(re-search-backward vhdl-b-t-b-re lim 'move))
+      (if (or (= (preceding-char) ?_)
+	      (vhdl-in-literal lim))
+	  (backward-char)
+	(cond
+	 ;; "begin" keyword:
+	 ((and (looking-at vhdl-begin-fwd-re)
+	       (/= (preceding-char) ?_)
+	       (vhdl-begin-p lim))
+	  (setq foundp 'begin))
+	 ;; "end" keyword:
+	 ((and (looking-at vhdl-end-fwd-re)
+	       (/= (preceding-char) ?_)
+	       (vhdl-end-p lim))
+	  (setq foundp 'end))
+	 ))
+      )
+    foundp
+    ))
+
+(defun vhdl-forward-sexp (&optional count lim)
+  "Move forward across one balanced expression (sexp).
+With COUNT, do it that many times."
+  (interactive "p")
+  (let ((count (or count 1))
+	(case-fold-search t)
+	end-vec target)
+    (save-excursion
+      (while (> count 0)
+	;; skip whitespace
+	(skip-chars-forward " \t\n")
+	;; Check for an unbalanced "end" keyword
+	(if (and (looking-at vhdl-end-fwd-re)
+		 (/= (preceding-char) ?_)
+		 (not (vhdl-in-literal lim))
+		 (vhdl-end-p lim)
+		 (not (looking-at "else")))
+	    (error
+	     "Containing expression ends prematurely in vhdl-forward-sexp"))
+	;; If the current keyword is a "begin" keyword, then find the
+	;; corresponding "end" keyword.
+	(if (setq end-vec (vhdl-corresponding-end lim))
+	    (let (
+		  ;; end-re is the statement keyword to search for
+		  (end-re
+		   (concat "\\b\\(" (aref end-vec 0) "\\)\\b\\([^_]\\|\\'\\)"))
+		  ;; column is either the statement keyword target column
+		  ;; or nil
+		  (column (aref end-vec 1))
+		  (eol (vhdl-point 'eol))
+		  foundp literal placeholder)
+	      ;; Look for the statement keyword.
+	      (while (and (not foundp)
+			  (re-search-forward end-re nil t)
+			  (setq placeholder (match-end 1))
+			  (goto-char (match-beginning 0)))
+		;; If we are in a literal, or not in the right target
+		;; column and not on the same line as the begin, then
+		;; try again.
+		(if (or (and column
+			     (/= (current-indentation) column)
+			     (> (point) eol))
+			(= (preceding-char) ?_)
+			(setq literal (vhdl-in-literal lim)))
+		    (if (eq literal 'comment)
+			(end-of-line)
+		      (forward-char))
+		  ;; An "else" keyword corresponds to both the opening brace
+		  ;; of the following sexp and the closing brace of the
+		  ;; previous sexp.
+		  (if (not (looking-at "else"))
+		      (goto-char placeholder))
+		  (setq foundp t))
+		)
+	      (if (not foundp)
+		  (error "Unbalanced keywords in vhdl-forward-sexp"))
+	      )
+	  ;; If the current keyword is not a "begin" keyword, then just
+	  ;; perform the normal forward-sexp.
+	  (forward-sexp)
+	  )
+	(setq count (1- count))
+	)
+      (setq target (point)))
+    (goto-char target)
+    nil))
+
+(defun vhdl-backward-sexp (&optional count lim)
+  "Move backward across one balanced expression (sexp).
+With COUNT, do it that many times.  LIM bounds any required backward
+searches."
+  (interactive "p")
+  (let ((count (or count 1))
+	(case-fold-search t)
+	begin-vec target)
+    (save-excursion
+      (while (> count 0)
+	;; Perform the normal backward-sexp, unless we are looking at
+	;; "else" - an "else" keyword corresponds to both the opening brace
+	;; of the following sexp and the closing brace of the previous sexp.
+	(if (and (looking-at "else\\b\\([^_]\\|\\'\\)")
+		 (/= (preceding-char) ?_)
+		 (not (vhdl-in-literal lim)))
+	    nil
+	  (backward-sexp)
+	  (if (and (looking-at vhdl-begin-fwd-re)
+		   (/= (preceding-char) ?_)
+		   (not (vhdl-in-literal lim))
+		   (vhdl-begin-p lim))
+	      (error "Containing expression ends prematurely in vhdl-backward-sexp")))
+	;; If the current keyword is an "end" keyword, then find the
+	;; corresponding "begin" keyword.
+	(if (and (setq begin-vec (vhdl-corresponding-begin lim))
+		 (/= (preceding-char) ?_))
+	    (let (
+		  ;; begin-re is the statement keyword to search for
+		  (begin-re
+		   (concat "\\b\\(" (aref begin-vec 0) "\\)\\b[^_]"))
+		  ;; column is either the statement keyword target column
+		  ;; or nil
+		  (column (aref begin-vec 1))
+		  ;; internal-p controls where the statement keyword can
+		  ;; be found.
+		  (internal-p (aref begin-vec 3))
+		  (last-backward (point)) last-forward
+		  foundp literal keyword)
+	      ;; Look for the statement keyword.
+	      (while (and (not foundp)
+			  (re-search-backward begin-re lim t)
+			  (setq keyword
+				(buffer-substring (match-beginning 1)
+						  (match-end 1))))
+		;; If we are in a literal or in the wrong column,
+		;; then try again.
+		(if (or (and column
+			     (and (/= (current-indentation) column)
+				  ;; possibly accept current-column as
+				  ;; well as current-indentation.
+				  (or (not internal-p)
+				      (/= (current-column) column))))
+			(= (preceding-char) ?_)
+			(vhdl-in-literal lim))
+		    (backward-char)
+		  ;; If there is a supplementary keyword, then
+		  ;; search forward for it. 
+		  (if (and (setq begin-re (aref begin-vec 2))
+			   (or (not (listp begin-re))
+			       ;; If begin-re is an alist, then find the
+			       ;; element corresponding to the actual
+			       ;; keyword that we found.
+			       (progn
+				 (setq begin-re
+				       (assoc keyword begin-re))
+				 (and begin-re
+				      (setq begin-re (cdr begin-re))))))
+		      (and
+		       (setq begin-re
+			     (concat "\\b\\(" begin-re "\\)\\b[^_]"))
+		       (save-excursion
+			 (setq last-forward (point))
+			 ;; Look for the supplementary keyword
+			 ;; (bounded by the backward search start
+			 ;; point).
+			 (while (and (not foundp)
+				     (re-search-forward begin-re
+							last-backward t)
+				     (goto-char (match-beginning 1)))
+			   ;; If we are in a literal, then try again.
+			   (if (or (= (preceding-char) ?_)
+				   (setq literal
+					 (vhdl-in-literal last-forward)))
+			       (if (eq literal 'comment)
+				   (goto-char
+				    (min (vhdl-point 'eol) last-backward))
+				 (forward-char))
+			     ;; We have found the supplementary keyword.
+			     ;; Save the position of the keyword in foundp.
+			     (setq foundp (point)))
+			   )
+			 foundp)
+		       ;; If the supplementary keyword was found, then
+		       ;; move point to the supplementary keyword.
+		       (goto-char foundp))
+		    ;; If there was no supplementary keyword, then
+		    ;; point is already at the statement keyword.
+		    (setq foundp t)))
+		) ; end of the search for the statement keyword
+	      (if (not foundp)
+		  (error "Unbalanced keywords in vhdl-backward-sexp"))
+	      ))
+	(setq count (1- count))
+	)
+      (setq target (point)))
+    (goto-char target)
+    nil))
+
+(defun vhdl-backward-up-list (&optional count limit)
+  "Move backward out of one level of blocks.
+With argument, do this that many times."
+  (interactive "p")
+  (let ((count (or count 1))
+	target)
+    (save-excursion
+      (while (> count 0)
+	(if (looking-at vhdl-defun-re)
+	    (error "Unbalanced blocks"))
+	(vhdl-backward-to-block limit)
+	(setq count (1- count)))
+      (setq target (point)))
+    (goto-char target)))
+
+(defun vhdl-end-of-defun (&optional count)
+  "Move forward to the end of a VHDL defun."
+  (interactive)
+  (let ((case-fold-search t))
+    (vhdl-beginning-of-defun)
+    (if (not (looking-at "block\\|process"))
+	(re-search-forward "\\bis\\b"))
+    (vhdl-forward-sexp)))
+    
+(defun vhdl-mark-defun ()
+  "Put mark at end of this \"defun\", point at beginning."
+  (interactive)
+  (let ((case-fold-search t))
+    (push-mark)
+    (vhdl-beginning-of-defun)
+    (push-mark)
+    (if (not (looking-at "block\\|process"))
+	(re-search-forward "\\bis\\b"))
+    (vhdl-forward-sexp)
+    (exchange-point-and-mark)))
+
+(defun vhdl-beginning-of-libunit ()
+  "Move backward to the beginning of a VHDL library unit.
+Returns the location of the corresponding begin keyword, unless search
+stops due to beginning or end of buffer." 
+  ;; Note that if point is between the "libunit" keyword and the
+  ;; corresponding "begin" keyword, then that libunit will not be
+  ;; recognised, and the search will continue backwards.  If point is
+  ;; at the "begin" keyword, then the defun will be recognised.  The
+  ;; returned point is at the first character of the "libunit" keyword.
+  (let ((last-forward (point))
+	(last-backward
+	 ;; Just in case we are actually sitting on the "begin"
+	 ;; keyword, allow for the keyword and an extra character,
+	 ;; as this will be used when looking forward for the
+	 ;; "begin" keyword.
+	 (save-excursion (forward-word 1) (1+ (point))))
+	foundp literal placeholder)
+    ;; Find the "libunit" keyword.
+    (while (and (not foundp)
+		(re-search-backward vhdl-libunit-re nil 'move))
+      ;; If we are in a literal, or not at a real libunit, then try again.
+      (if (or (= (preceding-char) ?_)
+	      (vhdl-in-literal (point-min))
+	      (not (vhdl-libunit-p)))
+	  (backward-char)
+	;; Find the corresponding "begin" keyword.
+	(setq last-forward (point))
+	(while (and (not foundp)
+		    (re-search-forward "\\bis\\b[^_]" last-backward t)
+		    (setq placeholder (match-beginning 0)))
+	  (if (or (= (preceding-char) ?_)
+		  (setq literal (vhdl-in-literal last-forward)))
+	      ;; It wasn't a real keyword, so keep searching.
+	      (if (eq literal 'comment)
+		  (goto-char
+		   (min (vhdl-point 'eol) last-backward))
+		(forward-char))
+	    ;; We have found the begin keyword, loop will exit.
+	    (setq foundp placeholder)))
+	;; Go back to the libunit keyword
+	(goto-char last-forward)))
+    foundp))
+    
+(defun vhdl-beginning-of-defun (&optional count)
+  "Move backward to the beginning of a VHDL defun.
+With argument, do it that many times.
+Returns the location of the corresponding begin keyword, unless search
+stops due to beginning or end of buffer." 
+  ;; Note that if point is between the "defun" keyword and the
+  ;; corresponding "begin" keyword, then that defun will not be
+  ;; recognised, and the search will continue backwards.  If point is
+  ;; at the "begin" keyword, then the defun will be recognised.  The
+  ;; returned point is at the first character of the "defun" keyword.
+  (interactive "p")
+  (let ((count (or count 1))
+	(case-fold-search t)
+	(last-forward (point))
+	foundp)
+    (while (> count 0)
+      (setq foundp nil)
+      (goto-char last-forward)
+      (let ((last-backward
+	     ;; Just in case we are actually sitting on the "begin"
+	     ;; keyword, allow for the keyword and an extra character,
+	     ;; as this will be used when looking forward for the
+	     ;; "begin" keyword.
+	     (save-excursion (forward-word 1) (1+ (point))))
+	    begin-string literal)
+	(while (and (not foundp)
+		    (re-search-backward vhdl-defun-re nil 'move))
+	  ;; If we are in a literal, then try again.
+	  (if (or (= (preceding-char) ?_)
+		  (vhdl-in-literal (point-min)))
+	      (backward-char)
+	    (if (setq begin-string (vhdl-corresponding-defun))
+		;; This is a real defun keyword.
+		;; Find the corresponding "begin" keyword.
+		;; Look for the begin keyword.
+		(progn
+		  ;; Save the search start point.
+		  (setq last-forward (point))
+		  (while (and (not foundp)
+			      (search-forward begin-string last-backward t))
+		    (if (or (= (preceding-char) ?_)
+			    (save-match-data
+			      (setq literal (vhdl-in-literal last-forward))))
+			;; It wasn't a real keyword, so keep searching.
+			(if (eq literal 'comment)
+			    (goto-char
+			     (min (vhdl-point 'eol) last-backward))
+			  (forward-char))
+		      ;; We have found the begin keyword, loop will exit.
+		      (setq foundp (match-beginning 0)))
+		    )
+		  ;; Go back to the defun keyword
+		  (goto-char last-forward)) ; end search for begin keyword
+	      ))
+	  ) ; end of the search for the defun keyword
+	)
+      (setq count (1- count))
+      )
+    (vhdl-keep-region-active)
+    foundp))
+    
+(defun vhdl-beginning-of-statement (&optional count lim)
+  "Go to the beginning of the innermost VHDL statement.
+With prefix arg, go back N - 1 statements.  If already at the
+beginning of a statement then go to the beginning of the preceding
+one.  If within a string or comment, or next to a comment (only
+whitespace between), move by sentences instead of statements.
+
+When called from a program, this function takes 2 optional args: the
+prefix arg, and a buffer position limit which is the farthest back to
+search."
+  (interactive "p")
+  (let ((count (or count 1))
+	(case-fold-search t)
+	(lim (or lim (point-min)))
+	(here (point))
+	state)
+    (save-excursion
+      (goto-char lim)
+      (setq state (parse-partial-sexp (point) here nil nil)))
+    (if (and (interactive-p)
+	     (or (nth 3 state)
+		 (nth 4 state)
+		 (looking-at (concat "[ \t]*" comment-start-skip))))
+	(forward-sentence (- count))
+      (while (> count 0)
+	(vhdl-beginning-of-statement-1 lim)
+	(setq count (1- count))))
+    ;; its possible we've been left up-buf of lim
+    (goto-char (max (point) lim))
+    )
+  (vhdl-keep-region-active))
+
+(defconst vhdl-b-o-s-re
+  (concat ";\\|\(\\|\)\\|\\bwhen\\b[^_]\\|"
+	  vhdl-begin-bwd-re "\\|" vhdl-statement-bwd-re))
+
+(defun vhdl-beginning-of-statement-1 (&optional lim)
+  ;; move to the start of the current statement, or the previous
+  ;; statement if already at the beginning of one.
+  (let ((lim (or lim (point-min)))
+	(here (point))
+	(pos (point))
+	donep)
+    ;; go backwards one balanced expression, but be careful of
+    ;; unbalanced paren being reached
+    (if (not (vhdl-safe (progn (backward-sexp) t)))
+	(progn
+	  (backward-up-list 1)
+	  (forward-char)
+	  (vhdl-forward-syntactic-ws here)
+	  (setq donep t)))
+    (while (and (not donep)
+		(not (bobp))
+		;; look backwards for a statement boundary
+		(re-search-backward vhdl-b-o-s-re lim 'move))
+      (if (or (= (preceding-char) ?_)
+	      (vhdl-in-literal lim))
+	  (backward-char)
+	(cond
+	 ;; If we are looking at an open paren, then stop after it
+	 ((eq (following-char) ?\()
+	  (forward-char)
+	  (vhdl-forward-syntactic-ws here)
+	  (setq donep t))
+	 ;; If we are looking at a close paren, then skip it
+	 ((eq (following-char) ?\))
+	  (forward-char)
+	  (setq pos (point))
+	  (backward-sexp)
+	  (if (< (point) lim)
+	      (progn (goto-char pos)
+		     (vhdl-forward-syntactic-ws here)
+		     (setq donep t))))
+	 ;; If we are looking at a semicolon, then stop
+	 ((eq (following-char) ?\;)
+	  (progn
+	    (forward-char)
+	    (vhdl-forward-syntactic-ws here)
+	    (setq donep t)))
+	 ;; If we are looking at a "begin", then stop
+	 ((and (looking-at vhdl-begin-fwd-re)
+	       (/= (preceding-char) ?_)
+	       (vhdl-begin-p nil))
+	  ;; If it's a leader "begin", then find the
+	  ;; right place
+	  (if (looking-at vhdl-leader-re)
+	      (save-excursion
+		;; set a default stop point at the begin
+		(setq pos (point))
+		;; is the start point inside the leader area ?
+		(goto-char (vhdl-end-of-leader))
+		(vhdl-forward-syntactic-ws here)
+		(if (< (point) here)
+		    ;; start point was not inside leader area
+		    ;; set stop point at word after leader
+		    (setq pos (point))))
+	    (forward-word 1)
+	    (vhdl-forward-syntactic-ws here)
+	    (setq pos (point)))
+	  (goto-char pos)
+	  (setq donep t))
+	 ;; If we are looking at a "statement", then stop
+	 ((and (looking-at vhdl-statement-fwd-re)
+	       (/= (preceding-char) ?_)
+	       (vhdl-statement-p nil))
+	  (setq donep t))
+	 ;; If we are looking at a case alternative key, then stop
+	 ((looking-at vhdl-case-alternative-key)
+	  (save-excursion
+	    ;; set a default stop point at the when
+	    (setq pos (point))
+	    ;; is the start point inside the case alternative key ?
+	    (goto-char (match-end 0))
+	    (vhdl-forward-syntactic-ws here)
+	    (if (< (point) here)
+		;; start point was not inside the case alternative key
+		;; set stop point at word after case alternative keyleader
+		(setq pos (point))))
+	  (goto-char pos)
+	  (setq donep t))
+	 ;; Bogus find, continue
+	 (t
+	  (backward-char)))))
+    ))
+
+
+;; Defuns for calculating the current syntactic state:
+
+(defun vhdl-get-library-unit (bod placeholder)
+  ;; If there is an enclosing library unit at bod, with it's \"begin\"
+  ;; keyword at placeholder, then return the library unit type.
+  (let ((here (vhdl-point 'bol)))
+    (if (save-excursion
+	  (goto-char placeholder)
+	  (vhdl-safe (vhdl-forward-sexp 1 bod))
+	  (<= here (point)))
+	(save-excursion
+	  (goto-char bod)
+	  (cond
+	   ((looking-at "e") 'entity)
+	   ((looking-at "a") 'architecture)
+	   ((looking-at "c") 'configuration)
+	   ((looking-at "p")
+	    (save-excursion
+	      (goto-char bod)
+	      (forward-sexp)
+	      (vhdl-forward-syntactic-ws here)
+	      (if (looking-at "body\\b[^_]")
+		  'package-body 'package))))))
+    ))
+
+(defun vhdl-get-block-state (&optional lim)
+  ;; Finds and records all the closest opens.
+  ;; lim is the furthest back we need to search (it should be the
+  ;; previous libunit keyword).
+  (let ((here (point))
+	(lim (or lim (point-min)))
+	keyword sexp-start sexp-mid sexp-end
+	preceding-sexp containing-sexp
+	containing-begin containing-mid containing-paren)
+    (save-excursion
+      ;; Find the containing-paren, and use that as the limit
+      (if (setq containing-paren
+		(save-restriction
+		  (narrow-to-region lim (point))
+		  (vhdl-safe (scan-lists (point) -1 1))))
+	  (setq lim containing-paren))
+      ;; Look backwards for "begin" and "end" keywords.
+      (while (and (> (point) lim)
+		  (not containing-sexp))
+	(setq keyword (vhdl-backward-to-block lim))
+	(cond
+	 ((eq keyword 'begin)
+	  ;; Found a "begin" keyword
+	  (setq sexp-start (point))
+	  (setq sexp-mid (vhdl-corresponding-mid lim))
+	  (setq sexp-end (vhdl-safe
+			  (save-excursion
+			    (vhdl-forward-sexp 1 lim) (point))))
+	  (if (and sexp-end (<= sexp-end here))
+	      ;; we want to record this sexp, but we only want to
+	      ;; record the last-most of any of them before here
+	      (or preceding-sexp
+		  (setq preceding-sexp sexp-start))
+	    ;; we're contained in this sexp so put sexp-start on
+	    ;; front of list
+	    (setq containing-sexp sexp-start)
+	    (setq containing-mid sexp-mid)
+	    (setq containing-begin t)))
+	 ((eq keyword 'end)
+	  ;; Found an "end" keyword
+	  (forward-sexp)
+	  (setq sexp-end (point))
+	  (setq sexp-mid nil)
+	  (setq sexp-start
+		(or (vhdl-safe (vhdl-backward-sexp 1 lim) (point))
+		    (progn (backward-sexp) (point))))
+	  ;; we want to record this sexp, but we only want to
+	  ;; record the last-most of any of them before here
+	  (or preceding-sexp
+	      (setq preceding-sexp sexp-start)))
+	 )))
+    ;; Check if the containing-paren should be the containing-sexp
+    (if (and containing-paren
+	     (or (null containing-sexp)
+		 (< containing-sexp containing-paren)))
+	(setq containing-sexp containing-paren
+	      preceding-sexp nil
+	      containing-begin nil
+	      containing-mid nil))
+    (vector containing-sexp preceding-sexp containing-begin containing-mid)
+    ))
+	      
+
+(defconst vhdl-s-c-a-re
+  (concat vhdl-case-alternative-key "\\|" vhdl-case-header-key))
+
+(defun vhdl-skip-case-alternative (&optional lim)
+  ;; skip forward over case/when bodies, with optional maximal
+  ;; limit. if no next case alternative is found, nil is returned and point
+  ;; is not moved
+  (let ((lim (or lim (point-max)))
+	(here (point))
+	donep foundp)
+    (while (and (< (point) lim)
+		(not donep))
+      (if (and (re-search-forward vhdl-s-c-a-re lim 'move)
+	       (save-match-data
+		 (not (vhdl-in-literal)))
+	       (/= (match-beginning 0) here))
+	  (progn
+	    (goto-char (match-beginning 0))
+	    (cond
+	     ((and (looking-at "case")
+		   (re-search-forward "\\bis[^_]" lim t))
+	      (backward-sexp)
+	      (vhdl-forward-sexp))
+	     (t
+	      (setq donep t
+		    foundp t))))))
+    (if (not foundp)
+	(goto-char here))
+    foundp))
+
+(defun vhdl-backward-skip-label (&optional lim)
+  ;; skip backward over a label, with optional maximal
+  ;; limit. if label is found, nil is returned and point
+  ;; is not moved
+  (let ((lim (or lim (point-min)))
+	placeholder)
+    (if (save-excursion
+	  (vhdl-backward-syntactic-ws lim)
+	  (and (eq (preceding-char) ?:)
+	       (progn
+		 (backward-sexp)
+		 (setq placeholder (point))
+		 (looking-at vhdl-label-key))))
+	(goto-char placeholder))
+    ))
+
+(defun vhdl-get-syntactic-context ()
+  ;; guess the syntactic description of the current line of VHDL code.
+  (save-excursion
+    (save-restriction
+      (beginning-of-line)
+      (let* ((indent-point (point))
+	     (case-fold-search t)
+	     vec literal containing-sexp preceding-sexp
+	     containing-begin containing-mid containing-leader
+	     char-before-ip char-after-ip begin-after-ip end-after-ip
+	     placeholder lim library-unit
+	    )
+
+	;; Reset the syntactic context
+	(setq vhdl-syntactic-context nil)
+
+	(save-excursion
+	  ;; Move to the start of the previous library unit, and
+	  ;; record the position of the "begin" keyword.
+	  (setq placeholder (vhdl-beginning-of-libunit))
+	  ;; The position of the "libunit" keyword gives us a gross
+	  ;; limit point.
+	  (setq lim (point))
+	  )
+
+	;; If there is a previous library unit, and we are enclosed by
+	;; it, then set the syntax accordingly.
+	(and placeholder
+	     (setq library-unit (vhdl-get-library-unit lim placeholder))
+	     (vhdl-add-syntax library-unit lim))
+	    
+	;; Find the surrounding state.
+	(if (setq vec (vhdl-get-block-state lim))
+	    (progn
+	      (setq containing-sexp (aref vec 0))
+	      (setq preceding-sexp (aref vec 1))
+	      (setq containing-begin (aref vec 2))
+	      (setq containing-mid (aref vec 3))
+	      ))
+
+	;; set the limit on the farthest back we need to search
+	(setq lim (if containing-sexp
+		      (save-excursion
+			(goto-char containing-sexp)
+			;; set containing-leader if required
+			(if (looking-at vhdl-leader-re)
+			    (setq containing-leader (vhdl-end-of-leader)))
+			(vhdl-point 'bol))
+		    (point-min)))
+
+	;; cache char before and after indent point, and move point to
+	;; the most likely position to perform the majority of tests
+	(goto-char indent-point)
+	(skip-chars-forward " \t")
+	(setq literal (vhdl-in-literal lim))
+	(setq char-after-ip (following-char))
+	(setq begin-after-ip (and
+			      (not literal)
+			      (looking-at vhdl-begin-fwd-re)
+			      (vhdl-begin-p)))
+	(setq end-after-ip (and
+			    (not literal)
+			    (looking-at vhdl-end-fwd-re)
+			    (vhdl-end-p)))
+	(vhdl-backward-syntactic-ws lim)
+	(setq char-before-ip (preceding-char))
+	(goto-char indent-point)
+	(skip-chars-forward " \t")
+
+	;; now figure out syntactic qualities of the current line
+	(cond
+	 ;; CASE 1: in a string or comment.
+	 ((memq literal '(string comment))
+	  (vhdl-add-syntax literal (vhdl-point 'bopl)))
+	 ;; CASE 2: Line is at top level.
+	 ((null containing-sexp)
+	  ;; Find the point to which indentation will be relative
+	  (save-excursion
+	    (if (null preceding-sexp)
+		;; CASE 2X.1
+		;; no preceding-sexp -> use the preceding statement
+		(vhdl-beginning-of-statement-1 lim)
+	      ;; CASE 2X.2
+	      ;; if there is a preceding-sexp then indent relative to it
+	      (goto-char preceding-sexp)
+	      ;; if not at boi, then the block-opening keyword is
+	      ;; probably following a label, so we need a different
+	      ;; relpos
+	      (if (/= (point) (vhdl-point 'boi))
+		  ;; CASE 2X.3
+		  (vhdl-beginning-of-statement-1 lim)))
+	    ;; v-b-o-s could have left us at point-min
+	    (and (bobp)
+		 ;; CASE 2X.4
+		 (vhdl-forward-syntactic-ws indent-point))
+	    (setq placeholder (point)))
+	  (cond
+	   ;; CASE 2A : we are looking at a block-open
+	   (begin-after-ip
+	    (vhdl-add-syntax 'block-open placeholder))
+	   ;; CASE 2B: we are looking at a block-close
+	   (end-after-ip
+	    (vhdl-add-syntax 'block-close placeholder))
+	   ;; CASE 2C: we are looking at a top-level statement
+	   ((progn
+	      (vhdl-backward-syntactic-ws lim)
+	      (or (bobp)
+		  (= (preceding-char) ?\;)))
+	    (vhdl-add-syntax 'statement placeholder))
+	   ;; CASE 2D: we are looking at a top-level statement-cont
+	   (t
+	    (vhdl-beginning-of-statement-1 lim)
+	    ;; v-b-o-s could have left us at point-min
+	    (and (bobp)
+		 ;; CASE 2D.1
+		 (vhdl-forward-syntactic-ws indent-point))
+	    (vhdl-add-syntax 'statement-cont (point)))
+	   )) ; end CASE 2
+	 ;; CASE 3: line is inside parentheses.  Most likely we are
+	 ;; either in a subprogram argument (interface) list, or a
+	 ;; continued expression containing parentheses.
+	 ((null containing-begin)
+	  (vhdl-backward-syntactic-ws containing-sexp)
+	  (cond
+	   ;; CASE 3A: we are looking at the arglist closing paren
+	   ((eq char-after-ip ?\))
+	    (goto-char containing-sexp)
+	    (vhdl-add-syntax 'arglist-close (vhdl-point 'boi)))
+	   ;; CASE 3B: we are looking at the first argument in an empty
+	   ;; argument list.
+	   ((eq char-before-ip ?\()
+	    (goto-char containing-sexp)
+	    (vhdl-add-syntax 'arglist-intro (vhdl-point 'boi)))
+	   ;; CASE 3C: we are looking at an arglist continuation line,
+	   ;; but the preceding argument is on the same line as the
+	   ;; opening paren.  This case includes multi-line
+	   ;; expression paren groupings.
+	   ((and (save-excursion
+		   (goto-char (1+ containing-sexp))
+		   (skip-chars-forward " \t")
+		   (not (eolp))
+		   (not (looking-at "--")))
+		 (save-excursion
+		   (vhdl-beginning-of-statement-1 containing-sexp)
+		   (skip-chars-backward " \t(")
+		   (<= (point) containing-sexp)))
+	    (goto-char containing-sexp)
+	    (vhdl-add-syntax 'arglist-cont-nonempty (vhdl-point 'boi)))
+	   ;; CASE 3D: we are looking at just a normal arglist
+	   ;; continuation line
+	   (t (vhdl-beginning-of-statement-1 containing-sexp)
+	      (vhdl-forward-syntactic-ws indent-point)
+	      (vhdl-add-syntax 'arglist-cont (vhdl-point 'boi)))
+	   ))
+	 ;; CASE 4: A block mid open
+	 ((and begin-after-ip
+	       (looking-at containing-mid))
+	  (goto-char containing-sexp)
+	  ;; If the \"begin\" keyword is a trailer, then find v-b-o-s
+	  (if (looking-at vhdl-trailer-re)
+	      ;; CASE 4.1
+	      (progn (forward-sexp) (vhdl-beginning-of-statement-1 nil)))
+	  (vhdl-backward-skip-label (vhdl-point 'boi))
+	  (vhdl-add-syntax 'block-open (point)))
+	 ;; CASE 5: block close brace
+	 (end-after-ip
+	  (goto-char containing-sexp)
+	  ;; If the \"begin\" keyword is a trailer, then find v-b-o-s
+	  (if (looking-at vhdl-trailer-re)
+	      ;; CASE 5.1
+	      (progn (forward-sexp) (vhdl-beginning-of-statement-1 nil)))
+	  (vhdl-backward-skip-label (vhdl-point 'boi))
+	  (vhdl-add-syntax 'block-close (point)))
+	 ;; CASE 6: A continued statement
+	 ((and (/= char-before-ip ?\;)
+	       ;; check it's not a trailer begin keyword, or a begin
+	       ;; keyword immediately following a label.
+	       (not (and begin-after-ip
+			 (or (looking-at vhdl-trailer-re)
+			     (save-excursion
+			       (vhdl-backward-skip-label containing-sexp)))))
+	       ;; check it's not a statement keyword
+	       (not (and (looking-at vhdl-statement-fwd-re)
+			 (vhdl-statement-p)))
+	       ;; see if the b-o-s is before the indent point
+	       (> indent-point
+		  (save-excursion
+		    (vhdl-beginning-of-statement-1 containing-sexp)
+		    ;; If we ended up after a leader, then this will
+		    ;; move us forward to the start of the first
+		    ;; statement.  Note that a containing sexp here is
+		    ;; always a keyword, not a paren, so this will
+		    ;; have no effect if we hit the containing-sexp.
+		    (vhdl-forward-syntactic-ws indent-point)
+		    (setq placeholder (point))))
+	       ;; check it's not a block-intro
+	       (/= placeholder containing-sexp)
+	       ;; check it's not a case block-intro
+	       (save-excursion
+		 (goto-char placeholder)
+		 (or (not (looking-at vhdl-case-alternative-key))
+		     (> (match-end 0) indent-point))))
+	  (vhdl-add-syntax 'statement-cont placeholder)
+	  (if begin-after-ip
+	      (vhdl-add-syntax 'block-open)))
+	 ;; Statement. But what kind?
+	 ;; CASE 7: A case alternative key
+	 ((looking-at vhdl-case-alternative-key)
+	  ;; for a case alternative key, we set relpos to the first
+	  ;; non-whitespace char on the line containing the "case"
+	  ;; keyword.
+	  (goto-char containing-sexp)
+	  ;; If the \"begin\" keyword is a trailer, then find v-b-o-s
+	  (if (looking-at vhdl-trailer-re)
+	      (progn (forward-sexp) (vhdl-beginning-of-statement-1 nil)))
+	  (vhdl-add-syntax 'case-alternative (vhdl-point 'boi)))
+	 ;; CASE 8: statement catchall
+	 (t
+	  ;; we know its a statement, but we need to find out if it is
+	  ;; the first statement in a block
+	  (if containing-leader
+	      (goto-char containing-leader)
+	    (goto-char containing-sexp)
+	    ;; Note that a containing sexp here is always a keyword,
+	    ;; not a paren, so skip over the keyword.
+	    (forward-sexp))
+	  ;; move to the start of the first statement
+	  (vhdl-forward-syntactic-ws indent-point)
+	  (setq placeholder (point))
+	  ;; we want to ignore case alternatives keys when skipping forward
+	  (let (incase-p)
+	    (while (looking-at vhdl-case-alternative-key)
+	      (setq incase-p (point))
+	      ;; we also want to skip over the body of the
+	      ;; case/when statement if that doesn't put us at
+	      ;; after the indent-point
+	      (while (vhdl-skip-case-alternative indent-point))
+	      ;; set up the match end
+	      (looking-at vhdl-case-alternative-key)
+	      (goto-char (match-end 0))
+	      ;; move to the start of the first case alternative statement
+	      (vhdl-forward-syntactic-ws indent-point)
+	      (setq placeholder (point)))
+	    (cond
+	     ;; CASE 8A: we saw a case/when statement so we must be
+	     ;; in a switch statement.  find out if we are at the
+	     ;; statement just after a case alternative key
+	     ((and incase-p
+		   (= (point) indent-point))
+	      ;; relpos is the "when" keyword
+	      (vhdl-add-syntax 'statement-case-intro incase-p))
+	     ;; CASE 8B: any old statement
+	     ((< (point) indent-point)
+	      ;; relpos is the first statement of the block
+	      (vhdl-add-syntax 'statement placeholder)
+	      (if begin-after-ip
+		  (vhdl-add-syntax 'block-open)))
+	     ;; CASE 8C: first statement in a block
+	     (t
+	      (goto-char containing-sexp)
+	      ;; If the \"begin\" keyword is a trailer, then find v-b-o-s
+	      (if (looking-at vhdl-trailer-re)
+		  (progn (forward-sexp) (vhdl-beginning-of-statement-1 nil)))
+	      (vhdl-backward-skip-label (vhdl-point 'boi))
+	      (vhdl-add-syntax 'statement-block-intro (point))
+	      (if begin-after-ip
+		  (vhdl-add-syntax 'block-open)))
+	     )))
+	 )
+
+	;; now we need to look at any modifiers
+	(goto-char indent-point)
+	(skip-chars-forward " \t")
+	(if (looking-at "--")
+	    (vhdl-add-syntax 'comment))
+	;; return the syntax
+	vhdl-syntactic-context))))
+
+
+;; Standard indentation line-ups:
+
+(defun vhdl-lineup-arglist (langelem)
+  ;; lineup the current arglist line with the arglist appearing just
+  ;; after the containing paren which starts the arglist.
+  (save-excursion
+    (let* ((containing-sexp
+	    (save-excursion
+	      ;; arglist-cont-nonempty gives relpos ==
+	      ;; to boi of containing-sexp paren. This
+	      ;; is good when offset is +, but bad
+	      ;; when it is vhdl-lineup-arglist, so we
+	      ;; have to special case a kludge here.
+	      (if (memq (car langelem) '(arglist-intro arglist-cont-nonempty))
+		  (progn
+		    (beginning-of-line)
+		    (backward-up-list 1)
+		    (skip-chars-forward " \t" (vhdl-point 'eol)))
+		(goto-char (cdr langelem)))
+	      (point)))
+	   (cs-curcol (save-excursion
+			(goto-char (cdr langelem))
+			(current-column))))
+      (if (save-excursion
+	    (beginning-of-line)
+	    (looking-at "[ \t]*)"))
+	  (progn (goto-char (match-end 0))
+		 (backward-sexp)
+		 (forward-char)
+		 (vhdl-forward-syntactic-ws)
+		 (- (current-column) cs-curcol))
+	(goto-char containing-sexp)
+	(or (eolp)
+	    (let ((eol (vhdl-point 'eol))
+		  (here (progn
+			  (forward-char)
+			  (skip-chars-forward " \t")
+			  (point))))
+	      (vhdl-forward-syntactic-ws)
+	      (if (< (point) eol)
+		  (goto-char here))))
+	(- (current-column) cs-curcol)
+	))))
+
+(defun vhdl-lineup-arglist-intro (langelem)
+  ;; lineup an arglist-intro line to just after the open paren
+  (save-excursion
+    (let ((cs-curcol (save-excursion
+		       (goto-char (cdr langelem))
+		       (current-column)))
+	  (ce-curcol (save-excursion
+		       (beginning-of-line)
+		       (backward-up-list 1)
+		       (skip-chars-forward " \t" (vhdl-point 'eol))
+		       (current-column))))
+      (- ce-curcol cs-curcol -1))))
+
+(defun vhdl-lineup-comment (langelem)
+  ;; support old behavior for comment indentation. we look at
+  ;; vhdl-comment-only-line-offset to decide how to indent comment
+  ;; only-lines
+  (save-excursion
+    (back-to-indentation)
+    ;; at or to the right of comment-column
+    (if (>= (current-column) comment-column)
+	(vhdl-comment-indent)
+      ;; otherwise, indent as specified by vhdl-comment-only-line-offset
+      (if (not (bolp))
+	  (or (car-safe vhdl-comment-only-line-offset)
+	      vhdl-comment-only-line-offset)
+	(or (cdr-safe vhdl-comment-only-line-offset)
+	    (car-safe vhdl-comment-only-line-offset)
+	    -1000			;jam it against the left side
+	    )))))
+
+(defun vhdl-lineup-statement-cont (langelem)
+  ;; line up statement-cont after the assignment operator
+  (save-excursion
+    (let* ((relpos (cdr langelem))
+	   (assignp (save-excursion
+		     (goto-char (vhdl-point 'boi))
+		     (and (re-search-forward "\\(<\\|:\\)="
+					     (vhdl-point 'eol) t)
+			  (- (point) (vhdl-point 'boi)))))
+	   (curcol (progn
+		     (goto-char relpos)
+		     (current-column)))
+	   foundp)
+      (while (and (not foundp)
+		  (< (point) (vhdl-point 'eol)))
+	(re-search-forward "\\(<\\|:\\)=\\|(" (vhdl-point 'eol) 'move)
+	(if (vhdl-in-literal (cdr langelem))
+	    (forward-char)
+	  (if (= (preceding-char) ?\()
+	      ;; skip over any parenthesized expressions
+	      (goto-char (min (vhdl-point 'eol)
+			      (scan-lists (point) 1 1)))
+	    ;; found an assignment operator (not at eol)
+	    (setq foundp (not (looking-at "\\s-*$"))))))
+      (if (not foundp)
+	  ;; there's no assignment operator on the line
+	  vhdl-basic-offset
+	;; calculate indentation column after assign and ws, unless
+	;; our line contains an assignment operator
+	(if (not assignp)
+	    (progn
+	      (forward-char)
+	      (skip-chars-forward " \t")
+	      (setq assignp 0)))
+	(- (current-column) assignp curcol))
+      )))
+
+
+;; Indentation commands:
+
+;; This is used by indent-for-comment to decide how much to indent a
+;; comment in VHDL code based on its context.
+(defun vhdl-comment-indent ()
+  (if (looking-at (concat "^--"))
+      0				;Existing comment at bol stays there.
+    (let ((opoint (point))
+	  placeholder)
+      (save-excursion
+	(beginning-of-line)
+	(cond
+	 ;; CASE 1: use comment-column if previous line is a
+	 ;; comment-only line indented to the left of comment-column
+	 ((save-excursion
+	    (beginning-of-line)
+	    (and (not (bobp))
+		 (forward-line -1))
+	    (skip-chars-forward " \t")
+	    (prog1
+		(looking-at "--")
+	      (setq placeholder (point))))
+	  (goto-char placeholder)
+	  (if (< (current-column) comment-column)
+	      comment-column
+	    (current-column)))
+	 ;; CASE 2: If comment-column is 0, and nothing but space
+	 ;; before the comment, align it at 0 rather than 1.
+	 ((progn
+	    (goto-char opoint)
+	    (skip-chars-backward " \t")
+	    (and (= comment-column 0) (bolp)))
+	  0)
+	 ;; CASE 3: indent at comment column except leave at least one
+	 ;; space.
+	 (t (max (1+ (current-column))
+		 comment-column))
+	 )))))
+
+(defun vhdl-indent-line ()
+  ;; indent the current line as VHDL code. Returns the amount of
+  ;; indentation change
+  (let* ((syntax (vhdl-get-syntactic-context))
+	 (pos (- (point-max) (point)))
+	 (indent (apply '+ (mapcar 'vhdl-get-offset syntax)))
+	 (shift-amt  (- (current-indentation) indent)))
+    (and vhdl-echo-syntactic-information-p
+	 (message "syntax: %s, indent= %d" syntax indent))
+    (if (zerop shift-amt)
+	nil
+      (delete-region (vhdl-point 'bol) (vhdl-point 'boi))
+      (beginning-of-line)
+      (indent-to indent))
+    (if (< (point) (vhdl-point 'boi))
+	(back-to-indentation)
+      ;; If initial point was within line's indentation, position after
+      ;; the indentation.  Else stay at same point in text.
+      (if (> (- (point-max) pos) (point))
+	  (goto-char (- (point-max) pos)))
+      )
+    (run-hooks 'vhdl-special-indent-hook)
+    shift-amt))
+
+(defun vhdl-indent-command (&optional whole-exp)
+  "Indent current line as VHDL code, or in some cases insert a tab character.
+
+If `vhdl-tab-always-indent' is t, always just indent the current line.
+If nil, indent the current line only if point is at the left margin or
+in the line's indentation; otherwise insert a tab.  If other than nil
+or t, then tab is inserted only within literals (comments and strings)
+and inside preprocessor directives, but line is always reindented.
+
+A numeric argument, regardless of its value, means indent rigidly all
+the lines of the expression starting after point so that this line
+becomes properly indented.  The relative indentation among the lines
+of the expression are preserved."
+  (interactive "P")
+  (if whole-exp
+      ;; If arg, always indent this line as VHDL
+      ;; and shift remaining lines of expression the same amount.
+      (let ((shift-amt (vhdl-indent-line))
+	    beg end)
+	(save-excursion
+	  (if (eq vhdl-tab-always-indent t)
+	      (beginning-of-line))
+	  (setq beg (point))
+	  (forward-sexp)
+	  (setq end (point))
+	  (goto-char beg)
+	  (forward-line 1)
+	  (setq beg (point)))
+	(if (> end beg)
+	    (indent-code-rigidly beg end (- shift-amt))))
+    ;; No arg supplied, use vhdl-tab-always-indent to determine
+    ;; behavior
+    (cond
+     ;; CASE 1: indent when at column zero or in lines indentation,
+     ;; otherwise insert a tab
+     ((not vhdl-tab-always-indent)
+      (if (save-excursion
+	    (skip-chars-backward " \t")
+	    (not (bolp)))
+	  (insert-tab)
+	(vhdl-indent-line)))
+     ;; CASE 2: just indent the line
+     ((eq vhdl-tab-always-indent t)
+      (vhdl-indent-line))
+     ;; CASE 3: if in a literal, insert a tab, but always indent the
+     ;; line
+     (t
+      (if (vhdl-in-literal (vhdl-point 'bod))
+	  (insert-tab))
+      (vhdl-indent-line)
+      ))))
+
+(defun vhdl-indent-sexp (&optional endpos)
+  "Indent each line of the list starting just after point.
+If optional arg ENDPOS is given, indent each line, stopping when
+ENDPOS is encountered.  (interactive)"
+  (interactive)
+  (save-excursion
+    (let ((beg (point))
+	  (end (progn
+		 (vhdl-forward-sexp nil endpos)
+		 (point))))
+      (indent-region beg end nil))))
+
+(defun vhdl-show-syntactic-information ()
+  "Show syntactic information for current line."
+  (interactive)
+  (message "syntactic analysis: %s" (vhdl-get-syntactic-context))
+  (vhdl-keep-region-active))
+
+
+;; Verification and regression functions:
+
+(defun vhdl-regress-line (&optional arg)
+  "Check syntactic information for current line."
+  (interactive "P")
+  (let ((expected (save-excursion
+		    (end-of-line)
+		    (if (search-backward " -- ((" (vhdl-point 'bol) t)
+			(progn
+			  (forward-char 4)
+			  (read (current-buffer))))))
+	(actual (vhdl-get-syntactic-context))
+	(expurgated))
+    ;; remove the library unit symbols
+    (mapcar
+     (function
+      (lambda (elt)
+	(if (memq (car elt) '(entity configuration package
+				     package-body architecture))
+	    nil
+	  (setq expurgated (append expurgated (list elt))))))
+     actual)
+    (if (and (not arg) expected (listp expected))
+	(if (not (equal expected expurgated))
+	    (error "Should be: %s, is: %s" expected expurgated))
+      (save-excursion
+	(beginning-of-line)
+	(if (not (looking-at "^\\s-*\\(--.*\\)?$"))
+	    (progn
+	      (end-of-line)
+	      (if (search-backward " -- ((" (vhdl-point 'bol) t)
+		  (kill-line))
+	      (insert " -- ")
+	      (insert (format "%s" expurgated)))))))
+  (vhdl-keep-region-active))
+
+(defun test-vhdl-get-block-state ()
+  (interactive)
+  (let ((case-fold-search t)
+	here vec (delay 0.5))
+    (setq here (point))
+    (message "%s" (prin1-to-string (setq vec (vhdl-get-block-state))))
+    (and (aref vec 0)
+	 (goto-char (aref vec 0))
+	 (sit-for delay))
+    (and (aref vec 1)
+	 (goto-char (aref vec 1))
+	 (sit-for delay))
+    (goto-char here)
+    ))
+
+;; Support for Barry Warsaw's elp (emacs lisp profiler) package:
+
+(setq elp-all-instrumented-list nil)
+(setq elp-function-list
+      '(
+	vhdl-indent-command
+	vhdl-indent-line
+	vhdl-comment-indent
+	vhdl-lineup-statement-cont
+	vhdl-lineup-comment
+	vhdl-lineup-arglist-intro
+	vhdl-lineup-arglist
+	vhdl-get-syntactic-context
+	vhdl-skip-case-alternative
+	vhdl-get-block-state
+	vhdl-get-library-unit
+	vhdl-beginning-of-statement
+	vhdl-beginning-of-statement-1
+	vhdl-beginning-of-defun
+	vhdl-beginning-of-libunit
+	vhdl-backward-sexp
+	vhdl-forward-sexp
+	vhdl-backward-to-block
+	vhdl-statement-p
+	vhdl-end-of-leader
+	vhdl-corresponding-begin
+	vhdl-end-p
+	vhdl-corresponding-end
+	vhdl-corresponding-mid
+	vhdl-begin-p
+	vhdl-corresponding-defun
+	vhdl-defun-p
+	vhdl-libunit-p
+	vhdl-last-word
+	vhdl-first-word
+	vhdl-backward-syntactic-ws
+	vhdl-forward-syntactic-ws
+	vhdl-in-literal
+	vhdl-keep-region-active
+	))
+
+;; (elp-instrument-list elp-function-list)
+
+(defun vhdl-trace-all-functions ()
+  (interactive)
+  (let ((list elp-function-list))
+    (while list
+      (trace-function-background (car list))
+      (setq list (cdr list)))))
+
+
+;; Defuns for submitting bug reports:
+
+(defconst vhdl-version "$Revision: 1.1 $"
+  "vhdl-mode version number.")
+(defconst vhdl-mode-help-address "rwhitby@asc.corp.mot.com"
+  "Address accepting submission of bug reports.")
+
+(defun vhdl-version ()
+  "Echo the current version of vhdl-mode in the minibuffer."
+  (interactive)
+  (message "Using vhdl-mode %s" vhdl-version)
+  (vhdl-keep-region-active))
+
+;; get reporter-submit-bug-report when byte-compiling
+(and (fboundp 'eval-when-compile)
+     (eval-when-compile
+      (require 'reporter)))
+
+(defun vhdl-submit-bug-report ()
+  "Submit via mail a bug report on vhdl-mode."
+  (interactive)
+  ;; load in reporter
+  (and
+   (y-or-n-p "Do you want to submit a report on vhdl-mode? ")
+   (require 'reporter)
+   (reporter-submit-bug-report
+    vhdl-mode-help-address
+    (concat "vhdl-mode " vhdl-version)
+    (list
+     ;; report only the vars that affect indentation
+     'vhdl-basic-offset
+     'vhdl-offsets-alist
+     'vhdl-comment-only-line-offset
+     'vhdl-tab-always-indent
+     'tab-width
+     )
+    (function
+     (lambda ()
+       (insert
+	(if vhdl-special-indent-hook
+	    (concat "\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n"
+		    "vhdl-special-indent-hook is set to '"
+		    (format "%s" vhdl-special-indent-hook)
+		    ".\nPerhaps this is your problem?\n"
+		    "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n\n")
+	  "\n")
+	(format "vhdl-emacs-features: %s\n" vhdl-emacs-features)
+	)))
+    nil
+    "Dear Rod,"
+    )))
+
+(provide 'vhdl-mode)
+;;; vhdl-mode.el ends here