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From: Bjoern Hoehrmann <derhoermi@gmx.net>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>
Date: Thu, 03 Jan 2013 18:12:53 +0100
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Subject: Re: [abnf-discuss] How to indent ABNF figures in draft?
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* Paul Kyzivat wrote:
>And even if that text is considered normative, it isn't entirely clear =

>what is and isn't valid. I *think* it says that the beginning of all =

>rules must be indented the same amount, and continuation lines must be =

>indented more. So that the file could be preprocessed by finding the =

>first non-whitespace line, removing leading whitespace from that line, =

>and then removing identical leading whitespace from all subsequent =

>lines. Then process the result according to the ABNF for ABNF.

That's what I did with http://search.cpan.org/~bjoern/Parse-ABNF-0.05/
where the documentation notes:

  The ABNF specification disallows white space preceding the left hand
  side, and so does this module. Remove it prior to passing the grammar
  e.g. using

    $grammar =3D~ s/^\s+(?=3D[\w-]+\s*=3D)//mg;

  This module does not do that for you in order to preserve line and
  column numbers. Patches adapting the grammar to allow leading white
  space welcome.
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