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lib/Astro/Coord/ECI/TLE.pm  view on Meta::CPAN

# the listing based on the object being listed.
sub __list_type {
    my ( $self ) = @_;
    return $self->{inertial} ? 'inertial' : 'fixed';
}

# _looks_like_real
#
# This returns a boolean which is true if the input looks like a real
# number and is false otherwise. It is based on looks_like_number, but
# excludes things like NaN, and Inf.
sub _looks_like_real {
    my ( $number ) = @_;
    looks_like_number( $number )
	or return;
    $number =~ m/ \A nan \z /smxi
	and return;
    $number =~ m/ \A [+-]? inf (?: inity )? \z /smxi
	and return;
    return 1;
}

lib/Astro/Coord/ECI/TLE.pm  view on Meta::CPAN

	    $self->{$name} = undef;
	}
	return 0;
    }
}

# _set_optional_float_no_reinit
#
# This acts as a mutator for any attribute whose value is either undef
# or a floating-point number, and which does not cause the model to be
# renitialized when its value changes. We disallow NaN.

sub _set_optional_float_no_reinit {
    my ( $self, $name, $value ) = @_;
    if ( defined $value && ! _looks_like_real( $value ) ) {
	carp "Invalid $name '$value'; must be a float or undef";
	$value = undef;
    }
    $self->{$name} = $value;
    return 0;
}

lib/Astro/Coord/ECI/Utils.pm  view on Meta::CPAN

unless (eval {require Scalar::Util; Scalar::Util->import
	('looks_like_number'); 1}) {
    no warnings qw{once};
    *looks_like_number = sub {
	local $_ = shift;

	# checks from perlfaq4
	return 0 if !defined($_) || ref($_);
	return 1 if (/^[+-]?[0-9]+$/); # is a +/- integer
	return 1 if (/^([+-]?)(?=[0-9]|\.[0-9])[0-9]*(\.[0-9]*)?([Ee]([+-]?[0-9]+))?$/); # a C float
	return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i)
	    or ($] >= 5.006001 and /^Inf$/i);

	return 0;
    };
}

=item $maximum = max (...);

This subroutine returns the maximum of its arguments.  If List::Util can
be loaded and 'max' imported, that's what you get. Otherwise you get a