File Coverage

blib/lib/Test/Stream/Capabilities.pm

Criterion	Covered	Total	%
statement	31	43	72.0
branch	7	24	29.1
condition	1	15	6.6
subroutine	10	11	90.9
pod	3	4	75.0
total	52	97	53.6

package Test::Stream::Capabilities;
use strict;
use warnings;

use Config;
use Carp qw/croak/;

sub import {
    my $class = shift;
    my $caller = caller;

    for my $check (@_) {
        croak "'$check' is not a known capability"
            unless $check =~ m/^CAN_/ && $class->can("$check");

        my $const = get_const($check);
        no strict 'refs';
        *{"$caller\::$check"} = $const;
    }
}

my %LOOKUP;
sub get_const {
    my $check = shift;

    unless ($LOOKUP{$check}) {
        my $bool = __PACKAGE__->$check;
        $LOOKUP{$check} = sub() { $bool };
    }

    return $LOOKUP{$check};
}

sub CAN_REALLY_FORK {
    return 1 if $Config{d_fork};
    return 0;
}

sub CAN_FORK {
    return 1 if $Config{d_fork};
    return 0 unless $^O eq 'MSWin32' || $^O eq 'NetWare';
    return 0 unless $Config{useithreads};
    return 0 unless $Config{ccflags} =~ /-DPERL_IMPLICIT_SYS/;

    my $thread_const = get_const('CAN_THREAD');

    return $thread_const->();
}

sub CAN_THREAD {
    return 0 unless $] >= 5.008001;
    return 0 unless $Config{'useithreads'};

    # Threads are broken on perl 5.10.0 built with gcc 4.8+
    if ($] == 5.010000 && $Config{'ccname'} eq 'gcc' && $Config{'gccversion'}) {
        my @parts = split /\./, $Config{'gccversion'};
        return 0 if $parts[0] >= 4 && $parts[1] >= 8;
    }

    # Change to a version check if this ever changes
    return 0 if $INC{'Devel/Cover.pm'};
    return 1;
}

1;

__END__