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Re: [O] ebnf2ps for babel
From: |
Eric Schulte |
Subject: |
Re: [O] ebnf2ps for babel |
Date: |
Thu, 24 Oct 2013 19:58:19 -0600 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Hi Michael,
Thanks for sharing this.
Michael Gauland <address@hidden> writes:
> I've had a play with adding babel support for ebnf2ps, to generate
> railroad diagrams for a grammar.
>
> I'd appreciate any comments on the attached code.
>
I think you could probably remove the following lines.
(require 'ob-ref)
(require 'ob-comint)
(require 'ob-eval)
Aside from that nothing looks amiss.
>
> Would anyone else find this useful?
>
Personally, I hope I don't have to write a grammar any time soon, but
you never know what's around the corner...
If you could re-send ob-ebnf2ps as a patch (as generated with git
format-patch), and also add ebnf2ps to the `org-babel-load-languages'
variable in org.el I'd be very happy to apply this to the repository.
Thanks,
>
> Kind Regards,
> Mike Gauland
>
> ;;; ob-ebnf.el --- org-babel functions for ebnf evaluation
>
> ;; Copyright (C) your name here
>
> ;; Author: Michael Gauland
> ;; Keywords: literate programming, reproducible research
> ;; Homepage: http://orgmode.org
> ;; Version: 0.01
>
> ;;; License:
>
> ;; This program is free software; you can redistribute it and/or modify
> ;; it under the terms of the GNU General Public License as published by
> ;; the Free Software Foundation; either version 3, or (at your option)
> ;; any later version.
> ;;
> ;; This program is distributed in the hope that it will be useful,
> ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
> ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> ;; GNU General Public License for more details.
> ;;
> ;; You should have received a copy of the GNU General Public License
> ;; along with GNU Emacs; see the file COPYING. If not, write to the
> ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
> ;; Boston, MA 02110-1301, USA.
>
> ;;; Commentary:
>
> ;;; Org-Babel support for using ebnf2ps to generate encapsulated postscript
> ;;; railroad diagrams. It recogises these arguments:
> ;;;
> ;;; :file is required; it must include the extension '.eps.' All the rules
> ;;; in the block will be drawn in the same file. This is done by
> ;;; inserting a '[<file>' comment at the start of the block (see the
> ;;; documentation for ebnf-eps-buffer for more information).
> ;;;
> ;;; :style specifies a value in ebnf-style-database. This provides the
> ;;; ability to customise the output. The style can also specify the
> ;;; gramnmar syntax (by setting ebnf-syntax); note that only ebnf,
> ;;; iso-ebnf, and yacc are supported by this file.
>
> ;;; Requirements:
>
> ;;; Code:
> (require 'ob)
> (require 'ob-ref)
> (require 'ob-comint)
> (require 'ob-eval)
> (require 'ebnf2ps)
>
> ;; optionally declare default header arguments for this language
> (defvar org-babel-default-header-args:ebnf '((:style . nil)))
>
> ;; Use ebnf-eps-buffer to produce an encapsulated postscript file.
> ;;
> (defun org-babel-execute:ebnf (body params)
> "Execute a block of Ebnf code with org-babel. This function is
> called by `org-babel-execute-src-block'"
> (save-excursion
> (let* ((dest-file (cdr (assoc :file params)))
> (dest-dir (file-name-directory dest-file))
> (dest-root (file-name-sans-extension
> (file-name-nondirectory dest-file)))
> (dest-ext (file-name-extension dest-file))
> (style (cdr (assoc :style params)))
> (current-dir default-directory)
> (result nil))
> (with-temp-buffer
> (when style (ebnf-push-style style))
> (let
> ((comment-format
> (cond ((string= ebnf-syntax 'yacc) "/*%s*/")
> ((string= ebnf-syntax 'ebnf) ";%s")
> ((string= ebnf-syntax 'iso-ebnf) "(*%s*)")
> (t (setq result
> (format "EBNF error: format %s not supported."
> ebnf-syntax))))))
> (setq ebnf-eps-prefix dest-dir)
> (insert (format comment-format (format "[%s" dest-root)))
> (newline)
> (insert body)
> (newline)
> (insert (format comment-format (format "]%s" dest-root)))
> (ebnf-eps-buffer)
> (when style (ebnf-pop-style))))
> result
> )))
>
> (provide 'ob-ebnf)
> ;;; ob-ebnf.el ends here
>
--
Eric Schulte
https://cs.unm.edu/~eschulte
PGP: 0x614CA05D