/usr/share/perl5/Perl6/Caller.pm is in libperl6-caller-perl 0.100-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 | package Perl6::Caller;
use warnings;
use strict;
our $VERSION = '0.100';
$VERSION = eval $VERSION;
use overload '""' => \&package, fallback => 1;
sub import {
my ($class) = @_;
my $callpack = caller;
no strict 'refs';
*{"$callpack\::caller"} = \&caller;
}
sub caller {
my $thing = shift || 0;
my $frame =
__PACKAGE__ eq $thing
? ( shift || 0 )
: $thing;
return __PACKAGE__->new($frame);
}
my @methods;
BEGIN {
@methods = qw/package filename line subroutine hasargs
wantarray evaltext is_require/;
foreach my $method (@methods) {
no strict 'refs';
*$method = sub {
my ( $self, $frame ) = @_;
return $self->{$method};
};
}
}
sub new {
my $class = shift;
my $frame = @_ ? (shift || 0) : -1;
$frame += 2;
my $self = bless {} => __PACKAGE__;
my @caller = CORE::caller($frame);
return @caller if CORE::wantarray;
@$self{@methods} = @caller;
return $self;
}
1;
__END__
=head1 NAME
Perl6::Caller - OO C<caller()> interface
=head1 VERSION
Version 0.04
=cut
=head1 SYNOPSIS
use Perl6::Caller;
my $sub = caller->subroutine;
my $line_number = caller->line;
my $is_require = caller(3)->is_require;
=head1 EXPORT
=head1 C<caller>
# standard usage
print "In ", caller->subroutine,
" called from ", caller->file,
" line ", caller->line;
# get a caller object
my $caller = caller;
my $caller = caller(); # same thing
# get a caller object for a different stack from
my $caller = caller(2); # two stack frames up
print $caller->package; # prints the package name
# enjoy the original flavor
my @caller = caller; # original caller behavior
print $caller[0], # prints the package name
=head1 DESCRIPTION
This module is experimental. It's also alpha. Bug reports and patches
welcome.
By default, this module exports the C<caller> function. This automatically
returns a new C<caller> object. An optional argument specifies how many stack
frames back to skip, just like the C<CORE::caller> function. This lets you do
things like this:
print "In ", caller->subroutine,
" called from ", caller->file,
" line ", caller->line;
If you do not wish the C<caller> function imported, specify an empty import
list and instantiate a new C<Perl6::Caller> object.
use Perl6::Caller ();
my $caller = Perl6::Caller->new;
print $caller->line;
B<Note>: if the results from the module seem strange, please read
S<perldoc -s caller> carefully. It has stranger behavior than you might be
aware.
=head1 METHODS
The following methods are available on the C<caller> object. They return the
same values as documented in S<perldoc -f caller>.
There are no C<hints> and C<bitmask> methods because those are documented as
for internal use only.
=over 4
=item * C<package>
=item * C<filename>
=item * C<line>
=item * C<subroutine>
=item * C<hasargs>
=item * C<wantarray>
=item * C<evaltext>
=item * C<is_require>
=back
Note that each of these values will report correctly for when the caller
object was created. For example, the following will probably print different
line numbers:
print caller->line;
foo();
sub foo {
print caller->line;
}
However, the following will print the I<same> line numbers:
my $caller = Perl6::Caller->new; # everything is relative to here
print $caller->line;
foo($caller);
sub foo {
my $caller = shift;
print $caller->line;
}
=cut
=head1 CAVEATS
Most of the time, this package should I<just work> and not interfere with
anything else.
=over 4
=item * C<$hints>, C<$bitmask>
'hints' and 'bitmask' are not available. They are documented to be for
internal use only and should not be relied upon. Further, the bitmask caused
strange test failures, so I opted not to include them.
=item * Subclassing
Don't.
=item * Perl 6
I'm not entirely comfortable with the namespace. The S<Perl 6> caller
actually does considerably more, but for me to have a hope of working that in,
I need proper introspection and I don't have that. Thus, I've settled for
simply having a caller object.
=item * C<*CORE::GLOBAL::caller>
I didn't implement this, though I was tempted. It turns out to be a bit
tricky in spots and I'm very concerned about globally overriding behavior. I
might change my mind in the future if there's enough demand.
=item * Overloading
In string context, this returns the package name. This is to support the
original C<caller> behavior.
=item * List Context
In list context, we simply default to the original behavior of
C<CORE::caller>. However, this I<always> assumes we've called caller with an
argument. Calling C<caller> and C<caller(0)> are identical with this module.
It's difficult to avoid since the stack frame changes.
=back
=head1 AUTHOR
Curtis "Ovid" Poe, C<< <ovid@cpan.org> >>
=head1 ACKNOWLEDGEMENTS
Thanks to C<phaylon> for helping me revisit a bad design issue with this.
=head1 BUGS
Please report any bugs or feature requests to
C<bug-perl6-caller@rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Perl6-Caller>.
I will be notified, and then you'll automatically be notified of progress on
your bug as I make changes.
=head1 ACKNOWLEDGEMENTS
=head1 COPYRIGHT & LICENSE
Copyright 2007 Curtis "Ovid" Poe, all rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
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