On 2016-02-03 17:50:15, SREZIC wrote:
Show quoted text> On 2016-02-01 12:49:06, SAFRONOV wrote:
> > Initially problem described here:
> >
http://www.perlmonks.org/?node_id=1062358
> >
> > If the variable $x has been interpolated into a string (e.g. print
> > "$x\n"), and thus acquires a POK flag indicating that the SV
> > structure
> > has a pointer to a string then JSON module returns it as e.g.
> > '"0.99"', not as expected 0.99.
> >
> > the code in JSON module:
> >
> > sub value_to_json {
> > my ($self, $value) = @_;
> >
> > return 'null' if(!defined $value);
> >
> > my $b_obj = B::svref_2object(\$value); # for round trip problem
> > my $flags = $b_obj->FLAGS;
> >
> > return $value # as is
> > if $flags & ( B::SVp_IOK | B::SVp_NOK ) and !( $flags & B::SVp_POK );
> > # SvTYPE is IV or NV?
>
> It seems that print "$x\n" does not set POK starting with perl 5.20,
> so JSON.pm does what you want here:
>
> $ perl5.18.4 -MJSON -e '$x=1.1; print "$x\n"; warn encode_json [$x]'
> 1.1
> ["1.1"] at -e line 1.
> $ perl5.20.0 -MJSON -e '$x=1.1; print "$x\n"; warn encode_json [$x]'
> 1.1
> [1.1] at -e line 1.
>
> Also it seems that the alternative module JSON::Create does the right
> thing for older perls (checked only with 5.18.4):
>
> $ perl5.18.4 -MJSON::Create=create_json -e '$x=1.1; print "$x\n"; warn
> create_json [$x];'
> 1.1
> [1.1] at -e line 1.
And speaking of alternatives: it seems that Cpanel::JSON::XS behaves better than JSON::XS or JSON:PP. Here some systematic tests:
Integer (IV):
$ for i in $(ls /opt/perl-5.*/bin/perl | fgrep -v 5.21.); do echo -n "$i "; $i -MJSON::XS -wE 'my $x=30; my $y="$x"; print encode_json [$x],"\n"'; done
/opt/perl-5.10.1/bin/perl ["30"]
/opt/perl-5.16.3/bin/perl ["30"]
/opt/perl-5.20.0/bin/perl ["30"]
/opt/perl-5.20.3/bin/perl ["30"]
/opt/perl-5.22.1/bin/perl ["30"]
/opt/perl-5.22.2/bin/perl ["30"]
/opt/perl-5.24.0/bin/perl ["30"]
/opt/perl-5.25.1/bin/perl ["30"]
$ for i in $(ls /opt/perl-5.*/bin/perl | fgrep -v 5.21.); do echo -n "$i "; $i -MCpanel::JSON::XS -wE 'my $x=30; my $y="$x"; print encode_json [$x],"\n"'; done
/opt/perl-5.10.1/bin/perl [30]
/opt/perl-5.16.3/bin/perl [30]
/opt/perl-5.20.0/bin/perl [30]
/opt/perl-5.20.3/bin/perl [30]
/opt/perl-5.22.1/bin/perl [30]
/opt/perl-5.22.2/bin/perl [30]
/opt/perl-5.24.0/bin/perl [30]
/opt/perl-5.25.1/bin/perl [30]
Float (NV):
$ for i in $(ls /opt/perl-5.*/bin/perl | fgrep -v 5.21.); do echo -n "$i "; $i -MJSON::XS -wE 'my $x=30.0; my $y="$x"; print encode_json [$x],"\n"'; done
/opt/perl-5.10.1/bin/perl ["30"]
/opt/perl-5.16.3/bin/perl ["30"]
/opt/perl-5.20.0/bin/perl [30]
/opt/perl-5.20.3/bin/perl [30]
/opt/perl-5.22.1/bin/perl [30]
/opt/perl-5.22.2/bin/perl [30]
/opt/perl-5.24.0/bin/perl [30]
/opt/perl-5.25.1/bin/perl [30]
$ for i in $(ls /opt/perl-5.*/bin/perl | fgrep -v 5.21.); do echo -n "$i "; $i -MCpanel::JSON::XS -wE 'my $x=30.0; my $y="$x"; print encode_json [$x],"\n"'; done
/opt/perl-5.10.1/bin/perl [30.0]
/opt/perl-5.16.3/bin/perl [30.0]
/opt/perl-5.20.0/bin/perl [30.0]
/opt/perl-5.20.3/bin/perl [30.0]
/opt/perl-5.22.1/bin/perl [30.0]
/opt/perl-5.22.2/bin/perl [30.0]
/opt/perl-5.24.0/bin/perl [30.0]
/opt/perl-5.25.1/bin/perl [30.0]
(JSON::XS and JSON::PP behave the same in these tests)
