ABNF parser. Fix bug on productions like test = {"test"}* | ("tt" ["test"]). Reported by Markus Dreyer.

6 files changed, 562 insertions, 137 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 9bf1ae47cc1..3394f764c8d 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,43 @@
+2004-02-24  Vinicius Jose Latorre  <viniciusjl@ig.com.br>
+
+        * ebnf-abn.el: New file, implements an ABNF parser.
+
+        * ebnf2ps.el: Doc fix.  Accept ABNF (Augmented BNF).  New arrow shapes:
+        semi-up-hollow, semi-up-full, semi-down-hollow and semi-down-full.  Fix
+        a bug on productions like test = {"test"}* | ( "tt" ["test"] ).
+        Reported by Markus Dreyer <mdreyer@ix.urz.uni-heidelberg.de>.
+        (ebnf-version): New version number (4.0).
+        (ebnf-print-directory, ebnf-print-file, ebnf-spool-directory)
+        (ebnf-spool-file, ebnf-eps-directory, ebnf-eps-file)
+        (ebnf-delete-style): New commands.
+        (ebnf-directory, ebnf-file): New funs.
+        (ebnf-special-show-delimiter, ebnf-file-suffix-regexp)
+        (ebnf-production-name-p, ebnf-stop-on-error): New options.
+        (ebnf-syntax-alist): New var.
+        (ebnf-element-width): New fun replacing ebnf-list-width.
+        (ebnf-arrow-shape, ebnf-syntax): Custom fix.
+        (ebnf-style-custom-list, ebnf-style-database, ebnf-arrow-shape-alist)
+        (ebnf-prologue): Adjust vars.
+        (ebnf-setup, ebnf-insert-style, ebnf-merge-style, ebnf-apply-style)
+        (ebnf-reset-style, ebnf-push-style, ebnf-pop-style)
+        (ebnf-check-style-values, ebnf-generate-production)
+        (ebnf-generate-region, ebnf-production-dimension, ebnf-justify-list)
+        (ebnf-make-terminal1, ebnf-make-or-more1, ebnf-make-repeat)
+        (ebnf-token-repeat): Code fix.
+
+        * ebnf-yac.el: Doc fix.  Handle Bison pragmas %nonassoc, %right, %left
+        and %prec.  Suggested by Matthew K. Junker <junker@alum.mit.edu>.
+        (ebnf-yac-definitions, ebnf-yac-lex): Code fix.
+
+        * ebnf-iso.el: Doc fix.
+        (ebnf-iso-token-table, ebnf-iso-non-terminal-chars): Adjust vars.
+        (ebnf-iso-lex): Code fix.
+
+        * ebnf-bnf.el: Doc fix.
+        (ebnf-bnf-lex): Code fix.
+
+        * ebnf-otz.el: Doc fix.
+
 2004-02-23  Luc Teirlinck  <teirllm@auburn.edu>
 
         * abbrev.el (write-abbrev-file): Make argument optional.  Doc fix.
diff --git a/lisp/progmodes/ebnf-bnf.el b/lisp/progmodes/ebnf-bnf.el
index f9d1c718d4f..41bd0cd0d49 100644
--- a/lisp/progmodes/ebnf-bnf.el
+++ b/lisp/progmodes/ebnf-bnf.el
@@ -1,12 +1,13 @@
 ;;; ebnf-bnf.el --- parser for EBNF
 
-;; Copyright (C) 1999, 2000, 2001 Free Sofware Foundation, Inc.
+;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+;; Free Sofware Foundation, Inc.
 
-;; Author: Vinicius Jose Latorre <vinicius@cpqd.com.br>
-;; Maintainer: Vinicius Jose Latorre <vinicius@cpqd.com.br>
+;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Time-stamp: <2004/02/22 14:25:06 vinicius>
 ;; Keywords: wp, ebnf, PostScript
-;; Time-stamp: <2003-02-10 10:29:48 jbarranquero>
-;; Version: 1.7
+;; Version: 1.8
 
 ;; This file is part of GNU Emacs.
 
@@ -462,9 +463,9 @@ See documentation for variable `ebnf-bnf-lex'."
         'integer)
        ;; special: ?special?
        ((eq token 'special)
-        (setq ebnf-bnf-lex (concat "?"
+        (setq ebnf-bnf-lex (concat (and ebnf-special-show-delimiter "?")
                                    (ebnf-string " ->@-~" ?\? "special")
-                                   "?"))
+                                   (and ebnf-special-show-delimiter "?")))
         'special)
        ;; terminal: "string"
        ((eq token 'terminal)
diff --git a/lisp/progmodes/ebnf-iso.el b/lisp/progmodes/ebnf-iso.el
index 9329f90af5e..148f23d2cab 100644
--- a/lisp/progmodes/ebnf-iso.el
+++ b/lisp/progmodes/ebnf-iso.el
@@ -1,12 +1,13 @@
 ;;; ebnf-iso.el --- parser for ISO EBNF
 
-;; Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+;; Free Software Foundation, Inc.
 
-;; Author: Vinicius Jose Latorre <vinicius@cpqd.com.br>
-;; Maintainer: Vinicius Jose Latorre <vinicius@cpqd.com.br>
+;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Time-stamp: <2004/02/22 14:24:55 vinicius>
 ;; Keywords: wp, ebnf, PostScript
-;; Time-stamp: <2003/08/12 21:29:14 vinicius>
-;; Version: 1.6
+;; Version: 1.7
 
 ;; This file is part of GNU Emacs.
 
@@ -112,7 +113,7 @@
 ;; ISO EBNF accepts the characters given by <character> production above,
 ;; HORIZONTAL TAB (^I), VERTICAL TAB (^K), NEWLINE (^J or ^M) and FORM FEED
 ;; (^L), any other characters are illegal.  But ebnf2ps accepts also the
-;; european 8-bit accentuated characters (from \240 to \377).
+;; european 8-bit accentuated characters (from \240 to \377) and underscore.
 ;;
 ;;
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -346,6 +347,7 @@
     ;; Override form feed character:
     (aset table ?\f 'form-feed)         ; [FF] form feed
     ;; Override other lexical characters:
+    (aset table ?_  'non-terminal)
     (aset table ?\" 'double-terminal)
     (aset table ?\' 'single-terminal)
     (aset table ?\? 'special)
@@ -390,7 +392,7 @@
 
 ;; replace the range "\240-\377" (see `ebnf-range-regexp').
 (defconst ebnf-iso-non-terminal-chars
-  (ebnf-range-regexp " 0-9A-Za-z" ?\240 ?\377))
+  (ebnf-range-regexp " 0-9A-Za-z_" ?\240 ?\377))
 
 
 (defun ebnf-iso-lex ()
@@ -439,9 +441,9 @@ See documentation for variable `ebnf-iso-lex'."
         'integer)
        ;; special: ?special?
        ((eq token 'special)
-        (setq ebnf-iso-lex (concat "?"
+        (setq ebnf-iso-lex (concat (and ebnf-special-show-delimiter "?")
                                    (ebnf-string " ->@-~" ?\? "special")
-                                   "?"))
+                                   (and ebnf-special-show-delimiter "?")))
         'special)
        ;; terminal: "string"
        ((eq token 'double-terminal)
diff --git a/lisp/progmodes/ebnf-otz.el b/lisp/progmodes/ebnf-otz.el
index 9f2a5aa7889..aae8906c384 100644
--- a/lisp/progmodes/ebnf-otz.el
+++ b/lisp/progmodes/ebnf-otz.el
@@ -1,11 +1,12 @@
 ;;; ebnf-otz.el --- syntactic chart OpTimiZer
 
-;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+;; Free Sofware Foundation, Inc.
 
-;; Author: Vinicius Jose Latorre <vinicius@cpqd.com.br>
-;; Maintainer: Vinicius Jose Latorre <vinicius@cpqd.com.br>
+;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Time-stamp: <2004/02/22 14:24:37 vinicius>
 ;; Keywords: wp, ebnf, PostScript
-;; Time-stamp: <2003-02-10 10:46:51 jbarranquero>
 ;; Version: 1.0
 
 ;; This file is part of GNU Emacs.
diff --git a/lisp/progmodes/ebnf-yac.el b/lisp/progmodes/ebnf-yac.el
index d0e85fe1444..199e076ad61 100644
--- a/lisp/progmodes/ebnf-yac.el
+++ b/lisp/progmodes/ebnf-yac.el
@@ -1,12 +1,13 @@
 ;;; ebnf-yac.el --- parser for Yacc/Bison
 
-;; Copyright (C) 1999, 2000, 2001 Free Sofware Foundation, Inc.
+;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+;; Free Sofware Foundation, Inc.
 
-;; Author: Vinicius Jose Latorre <vinicius@cpqd.com.br>
-;; Maintainer: Vinicius Jose Latorre <vinicius@cpqd.com.br>
+;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Time-stamp: <2004/02/22 14:24:17 vinicius>
 ;; Keywords: wp, ebnf, PostScript
-;; Time-stamp: <2003-02-10 10:47:04 jbarranquero>
-;; Version: 1.2
+;; Version: 1.2.1
 
 ;; This file is part of GNU Emacs.
 
@@ -42,7 +43,9 @@
 ;;
 ;; YACC = { YACC-Definitions }* "%%" { YACC-Rule }* [ "%%" [ YACC-Code ] ].
 ;;
-;; YACC-Definitions = "%token" [ "<" Name ">" ] Name-List
+;; YACC-Definitions = ( "%token" | "%left" | "%right" | "%nonassoc" )
+;;                    [ "<" Name ">" ] Name-List
+;;                  | "%prec" Name
 ;;                  | "any other Yacc definition"
 ;;                  .
 ;;
@@ -68,6 +71,19 @@
 ;;         | "//" "any character" "\\n".
 ;;
 ;;
+;; In other words, a valid Name begins with a letter (upper or lower case)
+;; followed by letters, decimal digits, underscore (_) or point (.).  For
+;; example: this_is_a_valid.name, Another_EXAMPLE, mIxEd.CaSe.
+;;
+;;
+;; Acknowledgements
+;; ----------------
+;;
+;; Thanks to Matthew K. Junker <junker@alum.mit.edu> for the suggestion to deal
+;; with %right, %left and %prec pragmas.  His suggestion was extended to deal
+;; with %nonassoc pragma too.
+;;
+;;
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 ;;; Code:
@@ -126,7 +142,9 @@
     syntax-list))
 
 
-;;; YACC-Definitions = "%token" [ "<" Name ">" ] Name-List
+;;; YACC-Definitions = ( "%token" | "%left" | "%right" | "%nonassoc" )
+;;;                    [ "<" Name ">" ] Name-List
+;;;                  | "%prec" Name
 ;;;                  | "any other Yacc definition"
 ;;;                  .
 
@@ -135,7 +153,8 @@
     (while (not (memq token '(yac-separator end-of-input)))
       (setq token
             (cond
-             ;; "%token" [ "<" Name ">" ] Name-List
+             ;; ( "%token" | "%left" | "%right" | "%nonassoc" )
+             ;; [ "<" Name ">" ] Name-List
              ((eq token 'yac-token)
               (setq token (ebnf-yac-lex))
               (when (eq token 'open-angle)
@@ -148,7 +167,12 @@
                     ebnf-yac-token-list (nconc (cdr token)
                                                ebnf-yac-token-list))
               (car token))
-             ;; "any other Yacc definition"
+             ;;  "%prec" Name
+             ((eq token 'yac-prec)
+              (or (eq (ebnf-yac-lex) 'non-terminal)
+                  (error "Missing prec name"))
+              (ebnf-yac-lex))
+             ;;  "any other Yacc definition"
              (t
               (ebnf-yac-lex))
              )))
@@ -360,9 +384,13 @@ See documentation for variable `ebnf-yac-lex'."
          ((eq (following-char) ?%)
           (forward-char)
           'yac-separator)
-         ;; %TOKEN
-         ((string= (upcase (ebnf-buffer-substring "0-9A-Za-z_")) "TOKEN")
-          'yac-token)
+         ;; %TOKEN, %RIGHT, %LEFT,  %PREC, %NONASSOC
+         ((cdr (assoc (upcase (ebnf-buffer-substring "0-9A-Za-z_"))
+                      '(("TOKEN"    . yac-token)
+                        ("RIGHT"    . yac-token)
+                        ("LEFT"     . yac-token)
+                        ("NONASSOC" . yac-token)
+                        ("PREC"     . yac-prec)))))
          ;; other Yacc pragmas
          (t
           'yac-pragma)
diff --git a/lisp/progmodes/ebnf2ps.el b/lisp/progmodes/ebnf2ps.el
index a069b83b15d..352767e508e 100644
--- a/lisp/progmodes/ebnf2ps.el
+++ b/lisp/progmodes/ebnf2ps.el
@@ -1,12 +1,13 @@
 ;;; ebnf2ps.el --- translate an EBNF to a syntactic chart on PostScript
 
-;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+;; Free Software Foundation, Inc.
 
-;; Author: Vinicius Jose Latorre <vinicius@cpqd.com.br>
-;; Maintainer: Vinicius Jose Latorre <vinicius@cpqd.com.br>
+;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
+;; Time-stamp: <2004/02/24 20:48:53 vinicius>
 ;; Keywords: wp, ebnf, PostScript
-;; Time-stamp: <2003/08/08 23:09:36 vinicius>
-;; Version: 3.6.1
+;; Version: 4.0
 ;; X-URL: http://www.cpqd.com.br/~vinicius/emacs/
 
 ;; This file is part of GNU Emacs.
@@ -26,14 +27,14 @@
 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 ;; Boston, MA 02111-1307, USA.
 
-(defconst ebnf-version "3.6.1"
-  "ebnf2ps.el, v 3.6.1 <2001/09/24 vinicius>
+(defconst ebnf-version "4.0"
+  "ebnf2ps.el, v 4.0 <2004/02/24 vinicius>
 
 Vinicius's last change version.  When reporting bugs, please also
 report the version of Emacs, if any, that ebnf2ps was running with.
 
 Please send all bug fixes and enhancements to
-        Vinicius Jose Latorre <vinicius@cpqd.com.br>.
+        Vinicius Jose Latorre <viniciusjl@ig.com.br>.
 ")
 
 
@@ -72,10 +73,16 @@ Please send all bug fixes and enhancements to
 ;; ebnf2ps provides six commands for generating PostScript syntactic chart
 ;; images of Emacs buffers:
 ;;
+;;      ebnf-print-directory
+;;      ebnf-print-file
 ;;      ebnf-print-buffer
 ;;      ebnf-print-region
+;;      ebnf-spool-directory
+;;      ebnf-spool-file
 ;;      ebnf-spool-buffer
 ;;      ebnf-spool-region
+;;      ebnf-eps-directory
+;;      ebnf-eps-file
 ;;      ebnf-eps-buffer
 ;;      ebnf-eps-region
 ;;
@@ -110,12 +117,16 @@ Please send all bug fixes and enhancements to
 ;; you'll be asked to confirm the exit; this is modeled on the confirmation
 ;; that Emacs uses for modified buffers.
 ;;
-;; The word "buffer" or "region" in the command name determines how much of the
-;; buffer is printed:
+;; The word "directory", "file", "buffer" or "region" in the command name
+;; determines how much of the buffer is printed:
 ;;
-;;      buffer  - Print the entire buffer.
+;;      directory  - Read files in the directory and print them.
 ;;
-;;      region  - Print just the current region.
+;;      file       - Read file and print it.
+;;
+;;      buffer     - Print the entire buffer.
+;;
+;;      region     - Print just the current region.
 ;;
 ;; Two ebnf- command examples:
 ;;
@@ -126,9 +137,10 @@ Please send all bug fixes and enhancements to
 ;;                           spool the image in Emacs to send to the printer
 ;;                           later.
 ;;
-;; Note that `ebnf-eps-buffer' and `ebnf-eps-region' never spool the EPS image,
-;; so they don't use the ps-print spooling mechanism.  See section "Actions in
-;; Comments" for an explanation about EPS file generation.
+;; Note that `ebnf-eps-directory', `ebnf-eps-file', `ebnf-eps-buffer' and
+;; `ebnf-eps-region' never spool the EPS image, so they don't use the ps-print
+;; spooling mechanism.  See section "Actions in Comments" for an explanation
+;; about EPS file generation.
 ;;
 ;;
 ;; Invoking Ebnf2ps
@@ -223,14 +235,30 @@ Please send all bug fixes and enhancements to
 ;;           .
 ;;
 ;;    non_terminal = "[!#%&'*-,0-:<>@-Z\\\\^-z~\\240-\\377]+".
+;;    ;; that is, a valid non_terminal accepts decimal digits, letters (upper
+;;    ;; and lower), 8-bit accentuated characters,
+;;    ;; "!", "#", "%", "&", "'", "*", "+", ",", ":",
+;;    ;; "<", ">", "@", "\", "^", "_", "`" and "~".
 ;;
 ;;    terminal = "\\([^\"\\]\\|\\\\[ -~\\240-\\377]\\)+".
+;;    ;; that is, a valid terminal accepts any printable character (including
+;;    ;; 8-bit accentuated characters) except `"', as `"' is used to delimit a
+;;    ;; terminal.  Also, accepts escaped characters, that is, a character
+;;    ;; pair starting with `\' followed by a printable character, for
+;;    ;; example: \", \\. 
 ;;
-;;    special = "[^?\\n\\000-\\010\\016-\\037\\177-\\237]*".
+;;    special = "[^?\\000-\\010\\012-\\037\\177-\\237]*".
+;;    ;; that is, a valid special accepts any printable character (including
+;;    ;; 8-bit accentuated characters) and tabs except `?', as `?' is used to
+;;    ;; delimit a special.
 ;;
 ;;    integer = "[0-9]+".
+;;    ;; that is, an integer is a sequence of one or more decimal digits.
 ;;
 ;;    comment = ";" "[^\\n\\000-\\010\\016-\\037\\177-\\237]*" "\\n".
+;;    ;; that is, a comment starts with the character `;' and terminates at end
+;;    ;; of line.  Also, it only accepts printable characters (including 8-bit
+;;    ;; accentuated characters) and tabs.
 ;;
 ;; Try to use the above EBNF to test ebnf2ps.
 ;;
@@ -273,6 +301,10 @@ Please send all bug fixes and enhancements to
 ;;                      `ebnf-terminal-regexp', `ebnf-case-fold-search',
 ;;                      `ebnf-lex-comment-char' and `ebnf-lex-eop-char'.
 ;;
+;;    `abnf'            ebnf2ps recognizes the syntax described in the URL:
+;;                      `http://www.faqs.org/rfcs/rfc2234.html'
+;;                      ("Augmented BNF for Syntax Specifications: ABNF").
+;;
 ;;    `iso-ebnf'        ebnf2ps recognizes the syntax described in the URL:
 ;;                      `http://www.cl.cam.ac.uk/~mgk25/iso-ebnf.html'
 ;;                      ("International Standard of the ISO EBNF Notation").
@@ -545,6 +577,9 @@ Please send all bug fixes and enhancements to
 ;;
 ;; `ebnf-terminal-border-color'         Specify border color for terminal box.
 ;;
+;; `ebnf-production-name-p'             Non-nil means production name will be
+;;                                      printed.
+;;
 ;; `ebnf-sort-production'               Specify how productions are sorted.
 ;;
 ;; `ebnf-production-font'               Specify production font.
@@ -562,6 +597,9 @@ Please send all bug fixes and enhancements to
 ;; `ebnf-non-terminal-border-color'     Specify border color for non-terminal
 ;;                                      box.
 ;;
+;; `ebnf-special-show-delimiter'        Non-nil means special delimiter
+;;                                      (character `?') is shown.
+;;
 ;; `ebnf-special-font'                  Specify special font.
 ;;
 ;; `ebnf-special-shape'                 Specify special box shape.
@@ -629,10 +667,16 @@ Please send all bug fixes and enhancements to
 ;;                                      default terminal, non-terminal or
 ;;                                      special.
 ;;
+;; `ebnf-file-suffix-regexp'            Specify file name suffix that contains
+;;                                      EBNF.
+;;
 ;; `ebnf-eps-prefix'                    Specify EPS prefix file name.
 ;;
 ;; `ebnf-use-float-format'              Non-nil means use `%f' float format.
 ;;
+;; `ebnf-stop-on-error'                 Non-nil means signal error and stop.
+;;                                      Nil means signal error and continue.
+;;
 ;; `ebnf-yac-ignore-error-recovery'     Non-nil means ignore error recovery.
 ;;
 ;; `ebnf-ignore-empty-rule'             Non-nil means ignore empty rules.
@@ -695,21 +739,24 @@ Please send all bug fixes and enhancements to
 ;; `ebnf-insert-style'  Insert a new style NAME with inheritance INHERITS and
 ;;                      values VALUES.
 ;;
+;; `ebnf-delete-style'  Delete style NAME.
+;;
 ;; `ebnf-merge-style'   Merge values of style NAME with style VALUES.
 ;;
-;; `ebnf-apply-style'   Set STYLE to current style.
+;; `ebnf-apply-style'   Set STYLE as the current style.
 ;;
 ;; `ebnf-reset-style'   Reset current style.
 ;;
-;; `ebnf-push-style'    Push the current style and set STYLE to current style.
+;; `ebnf-push-style'    Push the current style and set STYLE as the current
+;;                      style. 
 ;;
-;; `ebnf-pop-style'     Pop a style and set it to current style.
+;; `ebnf-pop-style'     Pop a style and set it as the current style.
 ;;
-;; These commands helps to put together a lot of variable settings in a group
+;; These commands help to put together a lot of variable settings in a group
 ;; and name this group.  So when you wish to apply these settings it's only
 ;; needed to give the name.
 ;;
-;; There is also a notion of simple inheritance of style; so if you declare
+;; There is also a notion of simple inheritance of style; so, if you declare
 ;; that a style A inherits from a style B, all settings of B is applied first
 ;; and then the settings of A is applied.  This is useful when you wish to
 ;; modify some aspects of an existing style, but at same time wish to keep it
@@ -994,6 +1041,17 @@ Please send all bug fixes and enhancements to
 ;; Acknowledgements
 ;; ----------------
 ;;
+;; Thanks to Drew Adams <?@?> for suggestions:
+;;    - `ebnf-production-name-p', `ebnf-stop-on-error',
+;;      `ebnf-file-suffix-regexp'and `ebnf-special-show-delimiter' variables.
+;;    - `ebnf-delete-style', `ebnf-eps-file' and `ebnf-eps-directory'
+;;      commands.
+;;    - some docs fix.
+;;
+;; Thanks to Matthew K. Junker <junker@alum.mit.edu> for the suggestion to deal
+;; with some Bison features (%right, %left and %prec pragmas).  His suggestion
+;; was extended to deal with %nonassoc pragma too.
+;;
 ;; Thanks to all who emailed comments.
 ;;
 ;;
@@ -1140,6 +1198,12 @@ Valid values are:
   :group 'ebnf-displacement)
 
 
+(defcustom ebnf-special-show-delimiter t
+  "*Non-nil means special delimiter (character `?') is shown."
+  :type 'boolean
+  :group 'ebnf-special)
+
+
 (defcustom ebnf-special-font '(7 Courier "Black" "Gray95" bold italic)
   "*Specify special font.
 
@@ -1332,6 +1396,12 @@ See documentation for `ebnf-non-terminal-shape'."
   :group 'ebnf-terminal)
 
 
+(defcustom ebnf-production-name-p t
+  "*Non-nil means production name will be printed."
+  :type 'boolean
+  :group 'ebnf-production)
+
+
 (defcustom ebnf-sort-production nil
   "*Specify how productions are sorted.
 
@@ -1482,14 +1552,28 @@ Valid values are:
                                                   |*
                                                   *
 
+   `semi-up-hollow'                `semi-up-full'
+                  *                               *
+                  |*                              |*
+                  | *                             |X*
+                ==+==*                          ==+==*
+
+   `semi-down-hollow'              `semi-down-full'
+                ==+==*                          ==+==*
+                  | *                             |X*
+                  |*                              |*
+                  *                               *
+
    `user'       See also documentation for variable `ebnf-user-arrow'.
 
 Any other value is treated as `none'."
   :type '(radio :tag "Arrow Shape"
-                (const none)        (const semi-up)
-                (const semi-down)   (const simple)
-                (const transparent) (const hollow)
-                (const full)        (const user))
+                (const none)             (const semi-up)
+                (const semi-down)        (const simple)
+                (const transparent)      (const hollow)
+                (const full)             (const semi-up-hollow)
+                (const semi-down-hollow) (const semi-up-full)
+                (const semi-down-full)   (const user))
   :group 'ebnf-shape)
 
 
@@ -1553,6 +1637,10 @@ Valid values are:
                 `ebnf-terminal-regexp', `ebnf-case-fold-search',
                 `ebnf-lex-comment-char' and `ebnf-lex-eop-char'.
 
+   `abnf'       ebnf2ps recognizes the syntax described in the URL:
+                `http://www.faqs.org/rfcs/rfc2234.html'
+                (\"Augmented BNF for Syntax Specifications: ABNF\").
+
    `iso-ebnf'   ebnf2ps recognizes the syntax described in the URL:
                 `http://www.cl.cam.ac.uk/~mgk25/iso-ebnf.html'
                 (\"International Standard of the ISO EBNF Notation\").
@@ -1567,7 +1655,7 @@ Valid values are:
 
 Any other value is treated as `ebnf'."
   :type '(radio :tag "Syntax"
-                (const ebnf) (const iso-ebnf) (const yacc))
+                (const ebnf) (const abnf) (const iso-ebnf) (const yacc))
   :group 'ebnf-syntactic)
 
 
@@ -1638,6 +1726,14 @@ It's only used when `ebnf-syntax' is `iso-ebnf'."
   :group 'ebnf-syntactic)
 
 
+(defcustom ebnf-file-suffix-regexp "\.[Bb][Nn][Ff]$"
+  "*Specify file name suffix that contains EBNF.
+
+See `ebnf-eps-directory' command."
+  :type 'regexp
+  :group 'ebnf2ps)
+
+
 (defcustom ebnf-eps-prefix "ebnf--"
   "*Specify EPS prefix file name.
 
@@ -1704,6 +1800,12 @@ when executing ebnf2ps, set `ebnf-use-float-format' to nil."
   :group 'ebnf2ps)
 
 
+(defcustom ebnf-stop-on-error nil
+  "*Non-nil means signal error and stop. Nil means signal error and continue."
+  :type 'boolean
+  :group 'ebnf2ps)
+
+
 (defcustom ebnf-yac-ignore-error-recovery nil
   "*Non-nil means ignore error recovery.
 
@@ -1763,6 +1865,34 @@ The above optimizations are specially useful when `ebnf-syntax' is `yacc'."
 
 
 ;;;###autoload
+(defun ebnf-print-directory (&optional directory)
+  "Generate and print a PostScript syntactic chart image of DIRECTORY.
+
+If DIRECTORY is nil, it's used `default-directory'.
+
+The files in DIRECTORY that matches `ebnf-file-suffix-regexp' (which see) are
+processed.
+
+See also `ebnf-print-buffer'."
+  (interactive
+   (list (read-file-name "Directory containing EBNF files (print): "
+                         nil default-directory)))
+  (ebnf-directory 'ebnf-print-buffer directory))
+
+
+;;;###autoload
+(defun ebnf-print-file (file &optional do-not-kill-buffer-when-done)
+  "Generate and print a PostScript syntactic chart image of the file FILE.
+
+If optional arg DO-NOT-KILL-BUFFER-WHEN-DONE is non-nil, the buffer isn't
+killed after process termination.
+
+See also `ebnf-print-buffer'."
+  (interactive "fEBNF file to generate PostScript and print from: ")
+  (ebnf-file 'ebnf-print-buffer file do-not-kill-buffer-when-done))
+
+
+;;;###autoload
 (defun ebnf-print-buffer (&optional filename)
   "Generate and print a PostScript syntactic chart image of the buffer.
 
@@ -1789,6 +1919,34 @@ Like `ebnf-print-buffer', but prints just the current region."
 
 
 ;;;###autoload
+(defun ebnf-spool-directory (&optional directory)
+  "Generate and spool a PostScript syntactic chart image of DIRECTORY.
+
+If DIRECTORY is nil, it's used `default-directory'.
+
+The files in DIRECTORY that matches `ebnf-file-suffix-regexp' (which see) are
+processed.
+
+See also `ebnf-spool-buffer'."
+  (interactive
+   (list (read-file-name "Directory containing EBNF files (spool): "
+                         nil default-directory)))
+  (ebnf-directory 'ebnf-spool-buffer directory))
+
+
+;;;###autoload
+(defun ebnf-spool-file (file &optional do-not-kill-buffer-when-done)
+  "Generate and spool a PostScript syntactic chart image of the file FILE.
+
+If optional arg DO-NOT-KILL-BUFFER-WHEN-DONE is non-nil, the buffer isn't
+killed after process termination.
+
+See also `ebnf-spool-buffer'."
+  (interactive "fEBNF file to generate PostScript and spool from: ")
+  (ebnf-file 'ebnf-spool-buffer file do-not-kill-buffer-when-done))
+
+
+;;;###autoload
 (defun ebnf-spool-buffer ()
   "Generate and spool a PostScript syntactic chart image of the buffer.
 Like `ebnf-print-buffer' except that the PostScript image is saved in a
@@ -1810,6 +1968,34 @@ Use the command `ebnf-despool' to send the spooled images to the printer."
 
 
 ;;;###autoload
+(defun ebnf-eps-directory (&optional directory)
+  "Generate EPS files from EBNF files in DIRECTORY.
+
+If DIRECTORY is nil, it's used `default-directory'.
+
+The files in DIRECTORY that matches `ebnf-file-suffix-regexp' (which see) are
+processed.
+
+See also `ebnf-eps-buffer'."
+  (interactive
+   (list (read-file-name "Directory containing EBNF files (EPS): "
+                         nil default-directory)))
+  (ebnf-directory 'ebnf-eps-buffer directory))
+
+
+;;;###autoload
+(defun ebnf-eps-file (file &optional do-not-kill-buffer-when-done)
+  "Generate an EPS file from EBNF file FILE.
+
+If optional arg DO-NOT-KILL-BUFFER-WHEN-DONE is non-nil, the buffer isn't
+killed after EPS generation.
+
+See also `ebnf-eps-buffer'."
+  (interactive "fEBNF file to generate EPS file from: ")
+  (ebnf-file 'ebnf-eps-buffer file do-not-kill-buffer-when-done))
+
+
+;;;###autoload
 (defun ebnf-eps-buffer ()
   "Generate a PostScript syntactic chart image of the buffer in a EPS file.
 
@@ -1883,7 +2069,8 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
    "
 ;;; ebnf2ps.el version %s
 
-\(setq ebnf-special-font                %s
+\(setq ebnf-special-show-delimiter      %S
+      ebnf-special-font                %s
       ebnf-special-shape               %s
       ebnf-special-shadow              %S
       ebnf-special-border-width        %S
@@ -1910,6 +2097,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
       ebnf-non-terminal-shadow         %S
       ebnf-non-terminal-border-width   %S
       ebnf-non-terminal-border-color   %S
+      ebnf-production-name-p           %S
       ebnf-sort-production             %s
       ebnf-production-font             %s
       ebnf-arrow-shape                 %s
@@ -1925,6 +2113,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
       ebnf-syntax                      %s
       ebnf-iso-alternative-p           %S
       ebnf-iso-normalize-p             %S
+      ebnf-file-suffix-regexp          %S
       ebnf-eps-prefix                  %S
       ebnf-entry-percentage            %S
       ebnf-color-p                     %S
@@ -1932,6 +2121,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
       ebnf-line-color                  %S
       ebnf-debug-ps                    %S
       ebnf-use-float-format            %S
+      ebnf-stop-on-error               %S
       ebnf-yac-ignore-error-recovery   %S
       ebnf-ignore-empty-rule           %S
       ebnf-optimize                    %S)
@@ -1939,6 +2129,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
 ;;; ebnf2ps.el - end of settings
 "
    ebnf-version
+   ebnf-special-show-delimiter
    (ps-print-quote ebnf-special-font)
    (ps-print-quote ebnf-special-shape)
    ebnf-special-shadow
@@ -1966,6 +2157,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
    ebnf-non-terminal-shadow
    ebnf-non-terminal-border-width
    ebnf-non-terminal-border-color
+   ebnf-production-name-p
    (ps-print-quote ebnf-sort-production)
    (ps-print-quote ebnf-production-font)
    (ps-print-quote ebnf-arrow-shape)
@@ -1981,6 +2173,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
    (ps-print-quote ebnf-syntax)
    ebnf-iso-alternative-p
    ebnf-iso-normalize-p
+   ebnf-file-suffix-regexp
    ebnf-eps-prefix
    ebnf-entry-percentage
    ebnf-color-p
@@ -1988,6 +2181,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
    ebnf-line-color
    ebnf-debug-ps
    ebnf-use-float-format
+   ebnf-stop-on-error
    ebnf-yac-ignore-error-recovery
    ebnf-ignore-empty-rule
    ebnf-optimize))
@@ -2007,7 +2201,8 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
 
 
 (defconst ebnf-style-custom-list
-  '(ebnf-special-font
+  '(ebnf-special-show-delimiter
+    ebnf-special-font
     ebnf-special-shape
     ebnf-special-shadow
     ebnf-special-border-width
@@ -2034,6 +2229,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
     ebnf-non-terminal-shadow
     ebnf-non-terminal-border-width
     ebnf-non-terminal-border-color
+    ebnf-production-name-p
     ebnf-sort-production
     ebnf-production-font
     ebnf-arrow-shape
@@ -2049,6 +2245,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
     ebnf-syntax
     ebnf-iso-alternative-p
     ebnf-iso-normalize-p
+    ebnf-file-suffix-regexp
     ebnf-eps-prefix
     ebnf-entry-percentage
     ebnf-color-p
@@ -2056,6 +2253,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
     ebnf-line-color
     ebnf-debug-ps
     ebnf-use-float-format
+    ebnf-stop-on-error
     ebnf-yac-ignore-error-recovery
     ebnf-ignore-empty-rule
     ebnf-optimize)
@@ -2066,6 +2264,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
   '(;; EBNF default
     (default
       nil
+      (ebnf-special-show-delimiter      . t)
       (ebnf-special-font          . '(7 Courier "Black" "Gray95" bold italic))
       (ebnf-special-shape               . 'bevel)
       (ebnf-special-shadow              . nil)
@@ -2093,6 +2292,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
       (ebnf-non-terminal-shadow         . nil)
       (ebnf-non-terminal-border-width   . 1.0)
       (ebnf-non-terminal-border-color   . "Black")
+      (ebnf-production-name-p           . t)
       (ebnf-sort-production             . nil)
       (ebnf-production-font             . '(10 Helvetica "Black" "White" bold))
       (ebnf-arrow-shape                 . 'hollow)
@@ -2108,6 +2308,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
       (ebnf-syntax                      . 'ebnf)
       (ebnf-iso-alternative-p           . nil)
       (ebnf-iso-normalize-p             . nil)
+      (ebnf-file-suffix-regexp          . "\.[Bb][Nn][Ff]$")
       (ebnf-eps-prefix                  . "ebnf--")
       (ebnf-entry-percentage            . 0.5)
       (ebnf-color-p   . (or (fboundp 'x-color-values) ; Emacs
@@ -2116,6 +2317,7 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
       (ebnf-line-color                  . "Black")
       (ebnf-debug-ps                    . nil)
       (ebnf-use-float-format            . t)
+      (ebnf-stop-on-error               . nil)
       (ebnf-yac-ignore-error-recovery   . nil)
       (ebnf-ignore-empty-rule           . nil)
       (ebnf-optimize                    . nil))
@@ -2125,6 +2327,10 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
      (ebnf-justify-sequence            . 'left)
      (ebnf-lex-comment-char            . ?\#)
      (ebnf-lex-eop-char                . ?\;))
+    ;; ABNF default
+    (abnf
+     default
+     (ebnf-syntax                      . 'abnf))
     ;; ISO EBNF default
     (iso-ebnf
      default
@@ -2138,19 +2344,31 @@ WARNING: It's *NOT* asked any confirmation to override an existing file."
 
 Each element has the following form:
 
-   (CUSTOM INHERITS (VAR . VALUE)...)
+   (NAME INHERITS (VAR . VALUE)...)
 
-CUSTOM is a symbol name style.
-INHERITS is a symbol name style from which the current style inherits the
-context.  If INHERITS is nil, means that there is no inheritance.
-VAR is a valid ebnf2ps symbol custom variable.  See `ebnf-style-custom-list'
-for valid symbol variable.
-VALUE is a sexp which it'll be evaluated to set the value to VAR.  So, don't
-forget to quote symbols and constant lists.  See `default' style for an
-example.
+Where:
 
-Don't handle this variable directly.  Use functions `ebnf-insert-style' and
-`ebnf-merge-style'.")
+NAME            is a symbol name style.
+
+INHERITS        is a symbol name style from which the current style inherits
+                the context.  If INHERITS is nil, means that there is no
+                inheritance.
+
+                This is a simple inheritance of style; so if you declare that a
+                style A inherits from a style B, all settings of B is applied
+                first and then the settings of A is applied.  This is useful
+                when you wish to modify some aspects of an existing style, but
+                at same time wish to keep it unmodified.
+
+VAR             is a valid ebnf2ps symbol custom variable.
+                See `ebnf-style-custom-list' for valid symbol variable.
+
+VALUE           is a sexp which it'll be evaluated to set the value to VAR.
+                So, don't forget to quote symbols and constant lists.
+                See `default' style for an example.
+
+Don't handle this variable directly.  Use functions `ebnf-insert-style',
+`ebnf-delete-style' and `ebnf-merge-style'.")
 
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -2159,8 +2377,10 @@ Don't handle this variable directly.  Use functions `ebnf-insert-style' and
 
 ;;;###autoload
 (defun ebnf-insert-style (name inherits &rest values)
-  "Insert a new style NAME with inheritance INHERITS and values VALUES."
-  (interactive)
+  "Insert a new style NAME with inheritance INHERITS and values VALUES.
+
+See `ebnf-style-database' documentation."
+  (interactive "SStyle name: \nSStyle inherits from: \nXStyle values: ")
   (and (assoc name ebnf-style-database)
        (error "Style name already exists: %s" name))
   (or (assoc inherits ebnf-style-database)
@@ -2171,9 +2391,28 @@ Don't handle this variable directly.  Use functions `ebnf-insert-style' and
 
 
 ;;;###autoload
+(defun ebnf-delete-style (name)
+  "Delete style NAME.
+
+See `ebnf-style-database' documentation."
+  (interactive "SDelete style name: ")
+  (or (assoc name ebnf-style-database)
+      (error "Style name doesn't exist: %s" name))
+  (let ((db ebnf-style-database))
+    (while db
+      (and (eq (nth 1 (car db)) name)
+           (error "Style name `%s' is inherited by `%s' style"
+                  name (nth 0 (car db))))
+      (setq db (cdr db))))
+  (setq ebnf-style-database (assq-delete-all name ebnf-style-database)))
+
+
+;;;###autoload
 (defun ebnf-merge-style (name &rest values)
-  "Merge values of style NAME with style VALUES."
-  (interactive)
+  "Merge values of style NAME with style VALUES.
+
+See `ebnf-style-database' documentation."
+  (interactive "SStyle name: \nXStyle values: ")
   (let ((style (or (assoc name ebnf-style-database)
                    (error "Style name does'nt exist: %s" name)))
         (merge (ebnf-check-style-values values))
@@ -2193,10 +2432,12 @@ Don't handle this variable directly.  Use functions `ebnf-insert-style' and
 
 ;;;###autoload
 (defun ebnf-apply-style (style)
-  "Set STYLE to current style.
+  "Set STYLE as the current style.
 
-It returns the old style symbol."
-  (interactive)
+It returns the old style symbol.
+
+See `ebnf-style-database' documentation."
+  (interactive "SApply style: ")
   (prog1
       ebnf-current-style
     (and (ebnf-apply-style1 style)
@@ -2207,18 +2448,22 @@ It returns the old style symbol."
 (defun ebnf-reset-style (&optional style)
   "Reset current style.
 
-It returns the old style symbol."
-  (interactive)
+It returns the old style symbol.
+
+See `ebnf-style-database' documentation."
+  (interactive "SReset style: ")
   (setq ebnf-stack-style nil)
   (ebnf-apply-style (or style 'default)))
 
 
 ;;;###autoload
 (defun ebnf-push-style (&optional style)
-  "Push the current style and set STYLE to current style.
+  "Push the current style and set STYLE as the current style.
 
-It returns the old style symbol."
-  (interactive)
+It returns the old style symbol.
+
+See `ebnf-style-database' documentation."
+  (interactive "SPush style: ")
   (prog1
       ebnf-current-style
     (setq ebnf-stack-style (cons ebnf-current-style ebnf-stack-style))
@@ -2228,9 +2473,11 @@ It returns the old style symbol."
 
 ;;;###autoload
 (defun ebnf-pop-style ()
-  "Pop a style and set it to current style.
+  "Pop a style and set it as the current style.
+
+It returns the old style symbol.
 
-It returns the old style symbol."
+See `ebnf-style-database' documentation."
   (interactive)
   (prog1
       (ebnf-apply-style (car ebnf-stack-style))
@@ -2249,7 +2496,7 @@ It returns the old style symbol."
 (defun ebnf-check-style-values (values)
   (let (style)
     (while values
-      (and (memq (car values) ebnf-style-custom-list)
+      (and (memq (caar values) ebnf-style-custom-list)
            (setq style (cons (car values) style)))
       (setq values (cdr values)))
     (nreverse style)))
@@ -2297,14 +2544,18 @@ documentation.")
 
 
 (defconst ebnf-arrow-shape-alist
-  '((none        . 0)
-    (semi-up     . 1)
-    (semi-down   . 2)
-    (simple      . 3)
-    (transparent . 4)
-    (hollow      . 5)
-    (full        . 6)
-    (user        . 7))
+  '((none             . 0)
+    (semi-up          . 1)
+    (semi-down        . 2)
+    (simple           . 3)
+    (transparent      . 4)
+    (hollow           . 5)
+    (full             . 6)
+    (semi-up-hollow   . 7)
+    (semi-up-full     . 8)
+    (semi-down-hollow . 9)
+    (semi-down-full   . 10)
+    (user             . 11))
   "Alist associating values for `ebnf-arrow-shape'.
 
 See documentation for `ebnf-arrow-shape'.")
@@ -2464,19 +2715,39 @@ See documentation for `ebnf-terminal-shape', `ebnf-non-terminal-shape' and
 
 /ArrowPath{c newpath moveto Arrow closepath}bind def
 
+/UpPath
+{c newpath moveto
+ hT2 neg 0   rmoveto
+ 0       hT4 rlineto
+ hT2 hT4 neg rlineto
+ closepath
+}bind def
+
+/DownPath
+{c newpath moveto
+ hT2 neg 0   rmoveto
+ 0   hT4 neg rlineto
+ hT2     hT4 rlineto
+ closepath
+}bind def
+
 %>Right Arrow: RA
 %    \\
 % *---+
 %    /
 /RA-vector
-[{}                                     % 0 - none
- {hT2 neg hT4 rlineto}                  % 1 - semi-up
- {Down}                                 % 2 - semi-down
- {Arrow}                                % 3 - simple
- {Gstroke ArrowPath}                    % 4 - transparent
- {Gstroke ArrowPath 1 FillGray}         % 5 - hollow
- {Gstroke ArrowPath LineColor FillRGB}  % 6 - full
- {Gstroke gsave UserArrow grestore}     % 7 - user
+[{}                                     % 0  - none
+ {hT2 neg hT4 rlineto}                  % 1  - semi-up
+ {Down}                                 % 2  - semi-down
+ {Arrow}                                % 3  - simple
+ {Gstroke ArrowPath}                    % 4  - transparent
+ {Gstroke ArrowPath 1 FillGray}         % 5  - hollow
+ {Gstroke ArrowPath LineColor FillRGB}  % 6  - full
+ {Gstroke UpPath 1 FillGray}            % 7  - semi-up-hollow
+ {Gstroke UpPath LineColor FillRGB}     % 8  - semi-up-full
+ {Gstroke DownPath 1 FillGray}          % 9  - semi-down-hollow
+ {Gstroke DownPath LineColor FillRGB}   % 10 - semi-down-full
+ {Gstroke gsave UserArrow grestore}     % 11 - user
 ]def
 
 /RA
@@ -3168,10 +3439,11 @@ See documentation for `ebnf-terminal-shape', `ebnf-non-terminal-shape' and
 {xyp
  neg yp add /yw exch def
  xp add T sub /xw exch def
- /Effect EffectP def
- /fP F ForegroundP SetRGB BackgroundP aload pop true BG S
- /Effect 0 def
- ( :) S false BG
+ dup length 0 gt        % empty string ==> no production name
+ {/Effect EffectP def
+  /fP F ForegroundP SetRGB BackgroundP aload pop true BG S
+  /Effect 0 def
+  ( :) S false BG}if
  xw yw moveto
  hT EL RA
  xp yw moveto
@@ -3909,11 +4181,15 @@ end
 (defun ebnf-generate-production (production)
   (ebnf-message-info "Generating")
   (run-hooks 'ebnf-production-hook)
-  (ps-output-string (ebnf-node-name production))
+  (ps-output-string (if ebnf-production-name-p
+                        (ebnf-node-name production)
+                      ""))
   (ps-output " "
              (ebnf-format-float
               (ebnf-node-width production)
-              (+ ebnf-basic-height
+              (+ (if ebnf-production-name-p
+                     ebnf-basic-height
+                   0.0)
                  (ebnf-node-entry (ebnf-node-production production))))
              " BOP\n")
   (ebnf-node-generation (ebnf-node-production production))
@@ -4102,6 +4378,35 @@ end
 ;; Internal functions
 
 
+(defun ebnf-directory (fun &optional directory)
+  "Process files in DIRECTORY applying function FUN on each file.
+
+If DIRECTORY is nil, it's used `default-directory'.
+
+The files in DIRECTORY that matches `ebnf-file-suffix-regexp' (which see) are
+processed."
+  (let ((files (directory-files (or directory default-directory)
+                                t ebnf-file-suffix-regexp)))
+    (while files
+      (set-buffer (find-file-noselect (car files)))
+      (funcall fun)
+      (setq buffer-backed-up t)             ; Do not back it up.
+      (save-buffer)                         ; Just save new version.
+      (kill-buffer (current-buffer))
+      (setq files (cdr files)))))
+
+
+(defun ebnf-file (fun file &optional do-not-kill-buffer-when-done)
+  "Process file FILE applying function FUN.
+
+If optional arg DO-NOT-KILL-BUFFER-WHEN-DONE is non-nil, the buffer isn't
+killed after process termination."
+  (set-buffer (find-file-noselect file))
+  (funcall fun)
+  (or do-not-kill-buffer-when-done
+      (kill-buffer (current-buffer))))
+
+
 ;; function `ebnf-range-regexp' is used to avoid a bug of `skip-chars-forward'
 ;; on version 20.4.1, that is, it doesn't accept ranges like "\240-\377" (or
 ;; "\177-\237"), but it accepts the character sequence from \240 to \377 (or
@@ -4143,6 +4448,7 @@ end
 (defun ebnf-generate-region (from to gen-func)
   (run-hooks 'ebnf-hook)
   (let ((ebnf-limit (max from to))
+        (error-msg "SYNTAX")
         the-point)
     (save-excursion
       (save-restriction
@@ -4150,20 +4456,38 @@ end
           (condition-case data
               (let ((tree (ebnf-parse-and-sort (min from to))))
                 (when gen-func
-                  (funcall gen-func
-                           (ebnf-dimensions
-                            (ebnf-optimize
-                             (ebnf-eliminate-empty-rules tree))))))
+                  (setq error-msg "EMPTY RULES"
+                        tree      (ebnf-eliminate-empty-rules tree))
+                  (setq error-msg "OPTMIZE"
+                        tree      (ebnf-optimize tree))
+                  (setq error-msg "DIMENSIONS"
+                        tree      (ebnf-dimensions tree))
+                  (setq error-msg "GENERATION")
+                  (funcall gen-func tree))
+                (setq error-msg nil))   ; here it's ok
             ;; handler
             ((quit error)
              (ding)
-             (setq the-point (max (1- (point)) (point-min)))
-             (message (error-message-string data)))))))
+             (setq the-point (max (1- (point)) (point-min))
+                   error-msg (concat error-msg ": "
+                                     (error-message-string data)
+                                     (if (string= error-msg "SYNTAX")
+                                         (format ". At %d in buffer \"%s\"."
+                                                 the-point
+                                                 (buffer-name))
+                                       (format ". In buffer \"%s\"."
+                                               (buffer-name))))))))))
     (cond
-     (the-point
-      (goto-char the-point))
+     ;; error occurred
+     (error-msg
+      (goto-char the-point)
+      (if ebnf-stop-on-error
+          (error error-msg)
+        (message error-msg)))
+     ;; generated output OK
      (gen-func
       nil)
+     ;; syntax checked OK
      (t
       (message "EBNF syntactic analysis: NO ERRORS.")))))
 
@@ -4267,6 +4591,15 @@ end
   (ebnf-font-select font 'line-height))
 
 
+(defconst ebnf-syntax-alist
+  ;; 0.syntax  1.parser         2.initializer
+  '((iso-ebnf  ebnf-iso-parser  ebnf-iso-initialize)
+    (yacc      ebnf-yac-parser  ebnf-yac-initialize)
+    (abnf      ebnf-abn-parser  ebnf-abn-initialize)
+    (ebnf      ebnf-bnf-parser  ebnf-bnf-initialize))
+  "Alist associating ebnf syntax with a parser and a initializer.")
+
+
 (defun ebnf-begin-job ()
   (ps-printing-region nil nil nil)
   (if ebnf-use-float-format
@@ -4276,15 +4609,10 @@ end
           ebnf-message-float "%s"))
   (ebnf-otz-initialize)
   ;; to avoid compilation gripes when calling autoloaded functions
-  (funcall (cond ((eq ebnf-syntax 'iso-ebnf)
-                  (setq ebnf-parser-func 'ebnf-iso-parser)
-                  'ebnf-iso-initialize)
-                 ((eq ebnf-syntax 'yacc)
-                  (setq ebnf-parser-func 'ebnf-yac-parser)
-                  'ebnf-yac-initialize)
-                 (t
-                  (setq ebnf-parser-func 'ebnf-bnf-parser)
-                  'ebnf-bnf-initialize)))
+  (let ((init (or (assoc ebnf-syntax ebnf-syntax-alist)
+                  (assoc 'ebnf ebnf-syntax-alist))))
+    (setq ebnf-parser-func (nth 1 init))
+    (funcall (nth 2 init)))
   (and ebnf-terminal-regexp             ; ensures that it's a string or nil
        (not (stringp ebnf-terminal-regexp))
        (setq ebnf-terminal-regexp nil))
@@ -4588,12 +4916,16 @@ end
   (ebnf-message-info "Calculating dimensions")
   (ebnf-node-dimension-func (ebnf-node-production production))
   (let* ((prod   (ebnf-node-production production))
-         (height (+ ebnf-font-height-P
+         (height (+ (if ebnf-production-name-p
+                        ebnf-font-height-P
+                      0.0)
+                    ebnf-line-width ebnf-line-width
                     ebnf-basic-height
                     (ebnf-node-height prod))))
     (ebnf-node-entry  production height)
     (ebnf-node-height production height)
     (ebnf-node-width  production (+ (ebnf-node-width prod)
+                                    ebnf-line-width
                                     ebnf-horizontal-space))))
 
 
@@ -4850,7 +5182,7 @@ end
 
 ;; [one-or-more  width-fun dim-fun entry height width element separator]
 ;; [zero-or-more width-fun dim-fun entry height width element separator]
-(defun ebnf-list-width (or-more width)
+(defun ebnf-element-width (or-more width)
   (setq width (- width ebnf-horizontal-space))
   (ebnf-node-list or-more
                   (ebnf-justify-list or-more
@@ -4881,7 +5213,10 @@ end
        ;; right justify terms
        ((eq ebnf-justify-sequence 'right)
         (ebnf-justify node seq seq-width width nil))
-       ;; centralize terms
+       ;; centralize terms -- element
+       ((vectorp seq)
+        (ebnf-adjust-width seq width))
+       ;; centralize terms -- list
        (t
         (let ((the-width (/ (- width seq-width) (length seq)))
               (lis seq))
@@ -5040,10 +5375,11 @@ end
           0.0
           0.0
           (let ((len (length name)))
-            (cond ((> len 2) name)
-                  ((= len 2) (concat " " name))
-                  ((= len 1) (concat " " name " "))
-                  (t         "   ")))
+            (cond ((> len 3) name)
+                  ((= len 3) (concat name " "))
+                  ((= len 2) (concat " " name " "))
+                  ((= len 1) (concat " " name "  "))
+                  (t         "    ")))
           ebnf-default-p))
 
 
@@ -5063,7 +5399,7 @@ end
 
 (defun ebnf-make-or-more1 (gen-func dim-func list-part sep-part)
   (vector gen-func
-          'ebnf-list-width
+          'ebnf-element-width
           dim-func
           0.0
           0.0
@@ -5119,14 +5455,25 @@ end
           exception))
 
 
-(defun ebnf-make-repeat (times primary)
+(defun ebnf-make-repeat (times primary &optional upper)
   (vector 'ebnf-generate-repeat
           'ignore
           'ebnf-repeat-dimension
           0.0
           0.0
           0.0
-          (concat times " *")
+          (cond ((and times upper)      ; L * U, L * L
+                 (if (string= times upper)
+                     (if (string= times "")
+                         " * "
+                       times)
+                   (concat times " * " upper)))
+                (times                  ; L *
+                 (concat times " *"))
+                (upper                  ; * U
+                 (concat "* " upper))
+                (t                      ; *
+                 " * "))
           primary))
 
 
@@ -5198,13 +5545,13 @@ end
                 )))))
 
 
-(defun ebnf-token-repeat (times repeat)
+(defun ebnf-token-repeat (times repeat &optional upper)
   (if (null (cdr repeat))
       ;; n * EMPTY ==> EMPTY
       repeat
     ;; n * term
     (cons (car repeat)
-          (ebnf-make-repeat times (cdr repeat)))))
+          (ebnf-make-repeat times (cdr repeat) upper))))
 
 
 (defun ebnf-token-optional (body)
@@ -5263,6 +5610,12 @@ end
 ;; To make this file smaller, some commands go in a separate file.
 ;; But autoload them here to make the separation invisible.
 
+(autoload 'ebnf-abn-parser            "ebnf-abn"
+  "ABNF parser.")
+
+(autoload 'ebnf-abn-initialize        "ebnf-abn"
+  "Initialize ABNF token table.")
+
 (autoload 'ebnf-bnf-parser            "ebnf-bnf"
   "EBNF parser.")