gawk: regression with unary plus

gawk: regression with unary plus

[Steven Penny]

Previously conversions could be triggered by either adding zero (+0), unary
plus (+) or unary minus (-) [1]:

    $ gawk --version
    GNU Awk 4.1.4, API: 1.1 (GNU MPFR 3.1.6-p1, GNU MP 6.1.2)

    $ ./gawk 'BEGIN {print "01" + 0}'
    1

    $ ./gawk 'BEGIN {print +"01"}'
    1

    $ ./gawk 'BEGIN {print -"01"}'
    -1

However now conversion only happens with adding zero and unary minus:

    $ gawk --version
    GNU Awk 4.2.0, API: 2.0 (GNU MPFR 3.1.6-p1, GNU MP 6.1.2)

    $ gawk 'BEGIN {print "01" + 0}'
    1

    $ gawk 'BEGIN {print +"01"}'
    01

    $ gawk 'BEGIN {print -"01"}'
    -1

Does anyone know where this change was mentioned or why it was done?

[1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html


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Re: gawk: regression with unary plus

[Houder]

On Sun, 04 Feb 2018 14:59:30, Steven Penny wrote:
> Previously conversions could be triggered by either adding zero (+0), unary
> plus (+) or unary minus (-) [1]:
[snip]

> However now conversion only happens with adding zero and unary minus:
[snip]

> Does anyone know where this change was mentioned or why it was done?
> 
> [1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html

For those who are interested:

    https://unix.stackexchange.com/questions/421904/regression-with-unary-plus
    (Regression with unary plus, by Steven Penny)

As suggested by Stéphane Chazelas in his response, the change in behaviour is
problably not intentional.

Modifying (i.e. extend it) the '0p_unary_plus CASE' in interpret.h, restores
the previous behaviour.

Henri


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Re: gawk: regression with unary plus

[Corinna Vinschen]

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On Feb  5 13:05, Houder wrote:
> On Sun, 04 Feb 2018 14:59:30, Steven Penny wrote:
> > Previously conversions could be triggered by either adding zero (+0), unary
> > plus (+) or unary minus (-) [1]:
> [snip]
> 
> > However now conversion only happens with adding zero and unary minus:
> [snip]
> 
> > Does anyone know where this change was mentioned or why it was done?
> > 
> > [1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html
> 
> For those who are interested:
> 
>     https://unix.stackexchange.com/questions/421904/regression-with-unary-plus
>     (Regression with unary plus, by Steven Penny)
> 
> As suggested by Stéphane Chazelas in his response, the change in behaviour is
> problably not intentional.
> 
> Modifying (i.e. extend it) the '0p_unary_plus CASE' in interpret.h, restores
> the previous behaviour.
> 
> Henri

I forwarded this to the gawk devel ML.


Thanks,
Corinna

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