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Re: Unexpected result while constructing strings
From: |
Andreas Schwab |
Subject: |
Re: Unexpected result while constructing strings |
Date: |
Sat, 30 Oct 2010 17:01:58 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) |
Davide Brini <address@hidden> writes:
> It surely seems that FS and " " are treated differently, at least in some
> cases:
>
> $ gawk 'BEGIN{print " " ++c}'
> 1
This is parsed as `(" ") (++c)' (a string cannot be operand of ++).
> $ gawk 'BEGIN{print FS ++c}'
> 0
This is parsed as `(FS++) c' (increment/decrement has highest
precedence). (FS++) evaluates to 0 which is then concatenated with the
empty string (c).
> Back to the example, I may be wrong but the only way I see for FS ++c to
> evaluate to plain 0 is that for some reason they are grouped as
>
> FS + +c
This would violate the longest token rule ("awk shall recognize the
longest possible token or delimiter beginning at a given point").
Andreas.
--
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
- Re: Unexpected result while constructing strings, (continued)
- Message not available
- Re: Unexpected result while constructing strings, Hermann Peifer, 2010/10/30
- Re: Unexpected result while constructing strings, Davide Brini, 2010/10/30
- Re: Unexpected result while constructing strings, Hermann Peifer, 2010/10/30
- Re: Unexpected result while constructing strings, Davide Brini, 2010/10/30
- Re: Unexpected result while constructing strings, Hermann Peifer, 2010/10/30
- Re: Unexpected result while constructing strings, Andreas Schwab, 2010/10/30
- Re: Unexpected result while constructing strings, Andreas Schwab, 2010/10/30
- Re: Unexpected result while constructing strings, Davide Brini, 2010/10/30
- Message not available
- Re: Unexpected result while constructing strings, Aharon Robbins, 2010/10/30
- Re: Unexpected result while constructing strings, Andreas Schwab, 2010/10/30
Message not available
- Re: Unexpected result while constructing strings,
Andreas Schwab <=