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Re: [bug-gawk] FPAT bug?
From: |
Manuel Collado |
Subject: |
Re: [bug-gawk] FPAT bug? |
Date: |
Wed, 5 Apr 2017 23:04:47 +0200 |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
El 03/04/2017 a las 8:29, address@hidden escribió:
[...]
I will get around to investigating the issue with FPAT.
Perhaps a problem with the FPAT feature is how the parsing algorithm is
structured. Thinking about it, I feel there is a simpler way to
structure the code.
Attached is what can be an awk reference implementation of the FPAT
parser. It differs from the current implementation in some ways:
- Each iteration of the parsing loop identifies exactly one
(separator[n-1],field[n])
pair. The last iteration may deliver just a final separator.
- Each (separator/field) pair must consume some input characters.
Except for the first (sep[0]/field[1]) that can be both nulls.
- So a null field is only valid as a first field or after
a non-null separator.
This avoid the use of flags to remember some state from the previous
loop iteration.
The attached code has been tested with the (adapted) set of fpat*.awk
tests, and some more.
Please advice if it is worth the pain of trying to restructure the
current code, or if there is a simpler way to fix the FPAT bug.
Hope this helps. Regards.
--
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado
refpatsplit.awk
Description: Text document
- Re: [bug-gawk] FPAT bug?, (continued)
- Re: [bug-gawk] FPAT bug?, Ed Morton, 2017/04/01
- Re: [bug-gawk] FPAT bug?, Andrew J. Schorr, 2017/04/01
- Re: [bug-gawk] FPAT bug?, Ed Morton, 2017/04/01
- Re: [bug-gawk] FPAT bug?, Andrew J. Schorr, 2017/04/02
- Re: [bug-gawk] FPAT bug?, david kerns, 2017/04/02
- Re: [bug-gawk] FPAT bug?, Andrew J. Schorr, 2017/04/02
- Re: [bug-gawk] FPAT bug?, Manuel Collado, 2017/04/02
- Re: [bug-gawk] FPAT bug?, Ed Morton, 2017/04/02
- Re: [bug-gawk] FPAT bug?, arnold, 2017/04/03
- Re: [bug-gawk] FPAT bug?, Ed Morton, 2017/04/03
- Re: [bug-gawk] FPAT bug?,
Manuel Collado <=
- Re: [bug-gawk] FPAT bug?, Arnold Robbins, 2017/04/12
Re: [bug-gawk] FPAT bug?, Ed Morton, 2017/04/01