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+;;; ob-ebnf.el --- org-babel functions for ebnf evaluation
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+
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+;; Copyright (C) your name here
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+
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+;; Author: Michael Gauland
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+;; Keywords: literate programming, reproducible research
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+;; Homepage: http://orgmode.org
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+;; Version: 1.00
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+
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+;;; License:
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+
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+;; This program is free software; you can redistribute it and/or modify
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+;; it under the terms of the GNU General Public License as published by
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+;; the Free Software Foundation; either version 3, or (at your option)
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+;; any later version.
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+;;
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+;; This program is distributed in the hope that it will be useful,
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+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+;; GNU General Public License for more details.
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+;;
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+;; You should have received a copy of the GNU General Public License
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+;; along with GNU Emacs; see the file COPYING. If not, write to the
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+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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+;; Boston, MA 02110-1301, USA.
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+
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+;;; Commentary:
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+
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+;;; Org-Babel support for using ebnf2ps to generate encapsulated postscript
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+;;; railroad diagrams. It recogises these arguments:
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+;;;
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+;;; :file is required; it must include the extension '.eps.' All the rules
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+;;; in the block will be drawn in the same file. This is done by
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+;;; inserting a '[<file>' comment at the start of the block (see the
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+;;; documentation for ebnf-eps-buffer for more information).
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+;;;
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+;;; :style specifies a value in ebnf-style-database. This provides the
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+;;; ability to customise the output. The style can also specify the
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+;;; gramnmar syntax (by setting ebnf-syntax); note that only ebnf,
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+;;; iso-ebnf, and yacc are supported by this file.
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+
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+;;; Requirements:
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+
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+;;; Code:
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+(require 'ob)
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+(require 'ebnf2ps)
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+
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+;; optionally declare default header arguments for this language
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+(defvar org-babel-default-header-args:ebnf '((:style . nil)))
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+
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+;; Use ebnf-eps-buffer to produce an encapsulated postscript file.
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+;;
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+(defun org-babel-execute:ebnf (body params)
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+ "Execute a block of Ebnf code with org-babel. This function is
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+called by `org-babel-execute-src-block'"
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+ (save-excursion
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+ (let* ((dest-file (cdr (assoc :file params)))
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+ (dest-dir (file-name-directory dest-file))
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+ (dest-root (file-name-sans-extension
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+ (file-name-nondirectory dest-file)))
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+ (dest-ext (file-name-extension dest-file))
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+ (style (cdr (assoc :style params)))
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+ (current-dir default-directory)
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+ (result nil))
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+ (with-temp-buffer
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+ (when style (ebnf-push-style style))
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+ (let
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+ ((comment-format
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+ (cond ((string= ebnf-syntax 'yacc) "/*%s*/")
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+ ((string= ebnf-syntax 'ebnf) ";%s")
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+ ((string= ebnf-syntax 'iso-ebnf) "(*%s*)")
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+ (t (setq result
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+ (format "EBNF error: format %s not supported."
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+ ebnf-syntax))))))
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+ (setq ebnf-eps-prefix dest-dir)
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+ (insert (format comment-format (format "[%s" dest-root)))
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+ (newline)
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+ (insert body)
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+ (newline)
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+ (insert (format comment-format (format "]%s" dest-root)))
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+ (ebnf-eps-buffer)
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+ (when style (ebnf-pop-style))))
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+ result
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+ )))
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+
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+(provide 'ob-ebnf)
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+;;; ob-ebnf.el ends here
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Michael Gauland