Re: [netmod] Last Call: <draft-ietf-netmod-artwork-folding-07.txt> (Handling Long Lines in Inclusions in Internet-Drafts and RFCs) to Best Current Practice
Paul Kyzivat <pkyzivat@alum.mit.edu> Fri, 02 August 2019 16:16 UTC
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To: Erik Auerswald <auerswal@unix-ag.uni-kl.de>, Kent Watsen <kent@watsen.net>
Cc: Ignas Bagdonas <ibagdona@gmail.com>, "netmod-chairs@ietf.org" <netmod-chairs@ietf.org>, draft-ietf-netmod-artwork-folding@ietf.org, IETF discussion list <ietf@ietf.org>, "netmod@ietf.org" <netmod@ietf.org>
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From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Date: Fri, 02 Aug 2019 12:16:34 -0400
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Subject: Re: [netmod] Last Call: <draft-ietf-netmod-artwork-folding-07.txt> (Handling Long Lines in Inclusions in Internet-Drafts and RFCs) to Best Current Practice
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On 8/2/19 9:22 AM, Erik Auerswald wrote: > Hi Paul, > > I'll try to elaborate on my understanding of "forced folding" below: > > On 02.08.19 02:08, Paul Kyzivat wrote: >> On 7/31/19 3:41 PM, Kent Watsen wrote: >>> [...] >>>> 2) Regarding forced folding in section 8.2.1: step 1 (Determine >>>> where the fold will occur) could benefit from some elaboration >>>> regarding lines that require forced folding. In particular, when an >>>> input line flagged for forced folding ends in backslash, then it >>>> must indeed be folded before the last character, while in all other >>>> cases it can be folded at any position prior to the max line length. >>>> (While this is obvious if you think about it, some might miss this.) > > If the original text data contains the folding sequence, one line of > that text data ends in a backslash. If such a line is folded before > the backslash, the folded data still contains the folding sequence that > came from the original text data (in addition to the folding sequences > inserted by folding). > > As I see it, forced folding would insert a new folding sequence inside > of the original folding sequence. > > Example before folding: > > foo\ > \bar > > Example after folding: > > == NOTE: '\\' line wrapping per BCP XX (RFC XXXX) == > > foo\\ > \ > \bar OK. I was still thinking of it a bit wrong. > A line that requires forced folding and that is already of maximum > length would be lengthened by forced folding, thus it would need to > be folded twice. > > This, of course, shows that unfolding must not recursively try to > unfold an already unfolded part of a line again. > >> [...] >> (Or do you want to allow the degenerate case where the line is folded >> at the end, so the continuation contains nothing?) > > I'd say that this degenerate case is required for forced folding to > work. Yeah, it seems so. It would be silly to do in any other case, but I guess it is not forbidden. But now that I am thinking about this, it occurs to me that maybe the two methods can be collapsed into one: just make the sequence to be inserted for folding be (using ABNF): "\" %x0C [%x0A] *" " ["\"] The trailing backslash only needs to be inserted if the character following it is a space or backslash. (IOW it is *optional* if the net character is *not* space or backslash.) So, when removing the folding, upon finding ("\" %x0C [%x0A] *" ") you remove that and if there is then a backslash remove that too. Thanks, Paul
- [netmod] Last Call: <draft-ietf-netmod-artwork-fo… The IESG
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Paul Kyzivat
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Kent Watsen
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Paul Kyzivat
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Erik Auerswald
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Paul Kyzivat
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Richard Barnes
- Re: [netmod] Last Call: <draft-ietf-netmod-artwor… Kent Watsen