UNIVERSAL-isa-1.20120726000755001750001750 012004137335 15343 5ustar00chromaticchromatic000000000000README100644001750001750 40212004137335 16260 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726UNIVERSAL::isa -------------- This module attempts to work around people calling UNIVERSAL::isa() as a function, which it is not. COPYRIGHT AND LICENCE Copyright (c) chromatic, 2005 - 2011. This module is made available under the same terms as Perl 5.12. Changes100644001750001750 225112004137335 16717 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726Changes for UNIVERSAL::isa -------------------------- 1.20120726 2012-07-25 20:51:54 America/Los_Angeles - updated to work on Perl 5.17.2+ (rjbs) 1.20120418 2012-04-18 12:15:33 America/Los_Angeles - removed use_ok from tests; it's unnecessary 1.20110613 2011-06-13 14:16:04 America/Los_Angeles - converted to Dist::Zilla 1.03 Mon Jun 22 20:42:36 UTC 2009 - improved packaging (Module::Build is now a config_requires dependency) 1.01 Aug 22 05:29:44 UTC 2008 - minor packaging housekeeping - report only CURRENT ACTUAL BUGS THAT WILL BREAK YOUR CODE AS IT EXISTS RIGHT NOW SO FIX THEM PLEASE rather than latent bugs that will break your code in the future, at least by default - added the verbose flag to fix you about all bugs regarding the use of isa() as a function 0.06 Fri Feb 24 06:47:14 UTC 2006 - allowed for overridden can() - allowed backwards-compatible use of isa() to check reftype - added Changes and README files - revised internal code for readability - improved documentation slightly 0.05 Nov 07 2005 0.04 Sep 11 2005 0.03 Sep 05 2005 0.02 Jul 03 2005 0.01 Jun 30 2005 - initial release LICENSE100644001750001750 4367212004137335 16465 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726This software is copyright (c) 2011 by chromatic@wgz.org. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. Terms of the Perl programming language system itself a) the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or b) the "Artistic License" --- The GNU General Public License, Version 1, February 1989 --- This software is Copyright (c) 2011 by chromatic@wgz.org. This is free software, licensed under: The GNU General Public License, Version 1, February 1989 GNU GENERAL PUBLIC LICENSE Version 1, February 1989 Copyright (C) 1989 Free Software Foundation, Inc. 51 Franklin St, Suite 500, Boston, MA 02110-1335 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The license agreements of most software companies try to keep users at the mercy of those companies. 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The End dist.ini100644001750001750 157612004137335 17101 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726name = UNIVERSAL-isa author = chromatic license = Perl_5 copyright_holder = chromatic@wgz.org copyright_year = 2011 [AutoVersion] format = {{ cldr('1.yyyyMMdd') }} [AutoPrereqs] [@Filter] -bundle = @Basic -remove = Readme [PkgVersion] [NextRelease] [@Git] changelog = Changes ; this is the default allow_dirty = dist.ini ; see Git::Check... allow_dirty = Changes ; ... and Git::Commit commit_msg = v%v%n%n%c ; see Git::Commit tag_format = %v ; see Git::Tag tag_message = %v ; see Git::Tag push_to = origin ; see Git::Push [MetaResources] homepage = https://github.com/chromatic/UNIVERSAL-isa repository.url = https://github.com/chromatic/UNIVERSAL-isa.git repository.web = https://github.com/chromatic/UNIVERSAL-isa repository.type = git t000755001750001750 012004137335 15527 5ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726bugs.t100644001750001750 550612004137335 17022 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726/t#! perl use strict; use warnings; use Test::More tests => 11; use UNIVERSAL::isa 'isa'; no warnings 'UNIVERSAL::isa'; # class method { package Foo; sub new { bless \(my $self), shift; } sub isa { 1 } } # delegates calls to Foo { package Bar; sub isa { return 1 if $_[1] eq 'Foo'; } } # really delegates calls to Foo { package FooProxy; sub new { my $class = shift; my $foo = Foo->new( @_ ); bless \$foo, $class; } sub can { my $self = shift; return $$self->can( @_ ); } sub isa { my $self = shift; $$self->can( 'isa' )->( @_ ); } } # wraps a Foo object { package Quux; use vars '$AUTOLOAD'; sub isa; sub new { my $class = shift; my $foo = Foo->new(); bless \$foo, $class; } sub can { my $self = shift; return $$self->can( @_ ); } sub AUTOLOAD { my $self = shift; my ($method) = $AUTOLOAD =~ /::(\w+)$/; $$self->$method( @_ ); } sub DESTROY {} } my $quux = Quux->new(); ok( isa( 'Bar', 'Foo' ), 'isa() should work on class methods too' ); ok( ! isa( 'Baz', 'Foo' ), '... but not for non-existant classes' ); ok( isa( $quux, 'Foo' ), '... and should work on delegated wrappers' ); is( scalar(isa(undef, 'Foo')), undef, 'isa on undef returns undef'); SKIP: { eval { require CGI }; skip( 'CGI not installed; RT #19671', 1 ) if $@; isa_ok( CGI->new(''), 'CGI' ); } # overloaded objects { package Qibble; use overload '""' => sub { die }; no warnings 'once'; *new = \&Foo::new; } my $qibble = Qibble->new(); ok( isa( $qibble, 'Qibble' ), '... can test ISA on landmines'); my $proxy = FooProxy->new(); isa_ok( $proxy, 'Foo' ); # valid use of isa() as static method on undefined class TODO: { my $warnings = ''; local $SIG{__WARN__} = sub { $warnings .= shift }; use warnings 'UNIVERSAL::isa'; # Broken how? -- rjbs, 2012-07-24 local $TODO = 'Apparently broken in 5.6.x' if $] < 5.007; { local $TODO = "UnloadedClass->isa('UNIVERSAL') fails until 5.17.2" if $] < 5.017002; ok( UnloadedClass->isa( 'UNIVERSAL' ), 'unloaded class should inherit from UNIVERSAL' ); } is( $warnings, '', '... and should not warn' ); } # on an unloaded class { my $warnings = ''; local $SIG{__WARN__} = sub { $warnings .= shift }; use warnings 'UNIVERSAL::isa'; UNIVERSAL::isa("Foo", "Bar"); like( $warnings, qr/Called UNIVERSAL::isa/, 'warning on unloaded class given class (RT #24822)' ); UNIVERSAL::isa(bless({}, "Foo"), "Bar"); like( $warnings, qr/Called UNIVERSAL::isa/, 'warning on unloaded class given object (RT #24882)' ); } META.yml100644001750001750 127412004137335 16701 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726--- abstract: 'Attempt to recover from people calling UNIVERSAL::isa as a function' author: - chromatic build_requires: CGI: 0 Test::More: 0 overload: 0 configure_requires: ExtUtils::MakeMaker: 6.30 dynamic_config: 0 generated_by: 'Dist::Zilla version 4.300020, CPAN::Meta::Converter version 2.120921' license: perl meta-spec: url: http://module-build.sourceforge.net/META-spec-v1.4.html version: 1.4 name: UNIVERSAL-isa requires: Scalar::Util: 0 UNIVERSAL: 0 perl: v5.6.2 strict: 0 vars: 0 warnings: 0 warnings::register: 0 resources: homepage: https://github.com/chromatic/UNIVERSAL-isa repository: https://github.com/chromatic/UNIVERSAL-isa.git version: 1.20120726 MANIFEST100644001750001750 16312004137335 16535 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726Changes LICENSE MANIFEST META.yml Makefile.PL README dist.ini lib/UNIVERSAL/isa.pm t/basic.t t/bugs.t t/warnings.t basic.t100644001750001750 1060012004137335 17152 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726/t#! perl use strict; use warnings; use Test::More tests => 46; use UNIVERSAL::isa 'isa'; use warnings; { package Foo; sub isa { 1 } } { package Bar; } { package Gorch; sub isa { my ($self, $class) = @_; $self->SUPER::isa($class) unless $class eq 'Glab'; } } { package Baz; sub isa { my ($self, $class) = @_; UNIVERSAL::isa($self, $class) unless $class eq 'Glab'; } } my ($f, $b, $g, $x) = map { bless [], $_ } qw( Foo Bar Gorch Baz ); { my $warning = ''; local $SIG{__WARN__} = sub { $warning = shift }; ok( isa( [], 'ARRAY' ), '[] is an array ref' ); is( $warning, '', 'not warning by default' ); $warning = ''; ok( isa( $b, 'Bar' ), 'bar is a Bar' ); is( $warning, '', 'not warning by default' ); $warning = ''; ok( isa( $f, 'Foo' ), 'foo is a Foo' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( !isa( $b, 'Zlap' ), 'bar is not Zlap' ); is( $warning, '', 'not warning by default' ); $warning = ''; ok( isa( $f, 'Zlap' ), 'neither is Foo' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( isa( $g, 'Gorch' ), 'Gorch is itself' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( !isa( $g, 'Zlap' ), 'gorch is not Zlap' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( isa( $g, 'Glab' ), '... it is dung' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( isa( $x, 'Baz' ), 'Baz is itself' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( !isa( $x, 'Zlap' ), 'baz is not Zlap' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); $warning = ''; ok( isa( $x, 'Glab' ), 'it is dung' ); like( $warning, qr/as a function.+basic.t/, '... warning by default' ); } { use warnings 'UNIVERSAL::isa'; my $warning = ''; local $SIG{__WARN__} = sub { $warning = shift }; $warning = ''; ok( isa( {}, 'HASH' ), 'hash reference isa HASH' ); is( $warning, '', '... and no warning by default' ); $warning = ''; ok( isa( [], 'ARRAY' ), 'array reference isa ARRAY' ); is( $warning, '', '... and no warning by default' ); $warning = ''; ok( isa( sub {}, 'CODE' ), 'code reference isa CODE' ); is( $warning, '', '... and no warning by default' ); $warning = ''; ok( isa( \my $a, 'SCALAR' ), 'scalar reference isa SCALAR' ); is( $warning, '', '... and no warning by default' ); $warning = ''; ok( isa( qr//, 'Regexp' ), 'regexp reference isa Regexp' ); is( $warning, '', '... and no warning by default' ); $warning = ''; ok( isa( \local *FOO, 'GLOB' ), 'glob reference isa GLOB' ); is( $warning, '', '... and no warning by default' ); } { use warnings 'UNIVERSAL::isa'; UNIVERSAL::isa::->import( 'verbose' ); my $warning = ''; local $SIG{__WARN__} = sub { $warning = shift }; ok( isa( {}, 'HASH' ), 'hash reference isa HASH' ); like( $warning, qr/Called.+as a function.+reftyp.+basic.t/, '... warning in verbose mode' ); $warning = ''; ok( isa( [], 'ARRAY' ), 'array reference isa ARRAY' ); like( $warning, qr/Called.+as a function.+reftyp.+basic.t/, '... warning in verbose mode' ); $warning = ''; ok( isa( sub {}, 'CODE' ), 'code reference isa CODE' ); like( $warning, qr/Called.+as a function.+reftyp.+basic.t/, '... warning in verbose mode' ); $warning = ''; ok( isa( \my $a, 'SCALAR' ), 'scalar reference isa SCALAR' ); like( $warning, qr/Called.+as a function.+reftyp.+basic.t/, '... warning in verbose mode' ); $warning = ''; ok( isa( qr//, 'Regexp' ), 'regexp reference isa Regexp' ); like( $warning, qr/Called.+as a functio.+basic.t/, '... warning in verbose mode' ); $warning = ''; ok( isa( \local *FOO, 'GLOB' ), 'glob reference isa GLOB' ); like( $warning, qr/Called.+as a function.+reftyp.+basic.t/, '... warning in verbose mode' ); } Makefile.PL100644001750001750 225012004137335 17375 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726 use strict; use warnings; use 5.006002; use ExtUtils::MakeMaker 6.30; my %WriteMakefileArgs = ( "ABSTRACT" => "Attempt to recover from people calling UNIVERSAL::isa as a function", "AUTHOR" => "chromatic", "BUILD_REQUIRES" => { "CGI" => 0, "Test::More" => 0, "overload" => 0 }, "CONFIGURE_REQUIRES" => { "ExtUtils::MakeMaker" => "6.30" }, "DISTNAME" => "UNIVERSAL-isa", "EXE_FILES" => [], "LICENSE" => "perl", "NAME" => "UNIVERSAL::isa", "PREREQ_PM" => { "Scalar::Util" => 0, "UNIVERSAL" => 0, "strict" => 0, "vars" => 0, "warnings" => 0, "warnings::register" => 0 }, "VERSION" => "1.20120726", "test" => { "TESTS" => "t/*.t" } ); unless ( eval { ExtUtils::MakeMaker->VERSION(6.56) } ) { my $br = delete $WriteMakefileArgs{BUILD_REQUIRES}; my $pp = $WriteMakefileArgs{PREREQ_PM}; for my $mod ( keys %$br ) { if ( exists $pp->{$mod} ) { $pp->{$mod} = $br->{$mod} if $br->{$mod} > $pp->{$mod}; } else { $pp->{$mod} = $br->{$mod}; } } } delete $WriteMakefileArgs{CONFIGURE_REQUIRES} unless eval { ExtUtils::MakeMaker->VERSION(6.52) }; WriteMakefile(%WriteMakefileArgs); warnings.t100644001750001750 341312004137335 17705 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726/t#! perl use strict; use warnings; use Test::More tests => 8; use UNIVERSAL::isa 'isa'; use warnings 'UNIVERSAL::isa'; { package Foo; sub isa { 1 } } { package Bar; } my $foo = bless {}, 'Foo'; my $bar = bless {}, 'bar'; { my $warning = ''; local $SIG{__WARN__} = sub { $warning = shift }; UNIVERSAL::isa( $foo, 'Foo' ); like( $warning, qr/Called UNIVERSAL::isa\(\) as a function.+warnings.t/, 'U::i should warn by default when redirecting to overridden method' ); $warning = ''; UNIVERSAL::isa( $foo, 'Bar' ); like( $warning, qr/Called UNIVERSAL::isa\(\) as a function.+warnings.t/, '... even if isa() would return false' ); $warning = ''; UNIVERSAL::isa( $bar, 'Foo' ); is( $warning, '', '... but not by default on default isa()' ); $warning = ''; UNIVERSAL::isa( $bar, 'Bar' ); is( $warning, '', '... even when it would return false' ); } { UNIVERSAL::isa::->import( 'verbose' ); my $warning = ''; local $SIG{__WARN__} = sub { $warning = shift }; UNIVERSAL::isa( $foo, 'Foo' ); like( $warning, qr/Called UNIVERSAL::isa\(\) as a function.+warnings.t/, 'U::i should warn when verbose when redirecting to overridden method' ); $warning = ''; UNIVERSAL::isa( $foo, 'Bar' ); like( $warning, qr/Called UNIVERSAL::isa\(\) as a function.+warnings.t/, '... even if isa() would return false' ); $warning = ''; UNIVERSAL::isa( $bar, 'Foo' ); like( $warning, qr/Called UNIVERSAL::isa\(\) as a function.+warnings.t/, '... and on default isa()' ); $warning = ''; UNIVERSAL::isa( $bar, 'Bar' ); like( $warning, qr/Called UNIVERSAL::isa\(\) as a function.+warnings.t/, '... even when it would return false' ); } UNIVERSAL000755001750001750 012004137335 17402 5ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726/libisa.pm100644001750001750 1053012004137335 20673 0ustar00chromaticchromatic000000000000UNIVERSAL-isa-1.20120726/lib/UNIVERSALpackage UNIVERSAL::isa; { $UNIVERSAL::isa::VERSION = '1.20120726'; } # ABSTRACT: Attempt to recover from people calling UNIVERSAL::isa as a function use strict; use warnings; use 5.6.2; use vars qw( $recursing ); use UNIVERSAL (); use Scalar::Util 'blessed'; use warnings::register; my ( $orig, $verbose_warning ); BEGIN { $orig = \&UNIVERSAL::isa } no warnings 'redefine'; sub import { my $class = shift; no strict 'refs'; for my $arg (@_) { *{ caller() . '::isa' } = \&UNIVERSAL::isa if $arg eq 'isa'; $verbose_warning = 1 if $arg eq 'verbose'; } } sub UNIVERSAL::isa { goto &$orig if $recursing; my $type = invocant_type(@_); $type->(@_); } sub invocant_type { my $invocant = shift; return \&nonsense unless defined($invocant); return \&object_or_class if blessed($invocant); return \&reference if ref($invocant); return \&nonsense unless $invocant; return \&object_or_class; } sub nonsense { report_warning('on invalid invocant') if $verbose_warning; return; } sub object_or_class { local $@; local $recursing = 1; if ( my $override = eval { $_[0]->can('isa') } ) { unless ( $override == \&UNIVERSAL::isa ) { report_warning(); my $obj = shift; return $obj->$override(@_); } } report_warning() if $verbose_warning; goto &$orig; } sub reference { report_warning('Did you mean to use Scalar::Util::reftype() instead?') if $verbose_warning; goto &$orig; } sub report_warning { my $extra = shift; $extra = $extra ? " ($extra)" : ''; if ( warnings::enabled() ) { my $calling_sub = ( caller(3) )[3] || ''; return if $calling_sub =~ /::isa$/; warnings::warn( "Called UNIVERSAL::isa() as a function, not a method$extra" ); } } __PACKAGE__; __END__ =pod =head1 NAME UNIVERSAL::isa - recover from people calling UNIVERSAL::isa as a function =head1 SYNOPSIS # from the shell echo 'export PERL5OPT=-MUNIVERSAL::isa' >> /etc/profile # within your program use UNIVERSAL::isa; # enable warnings for all dodgy uses of UNIVERSAL::isa use UNIVERSAL::isa 'verbose'; =head1 DESCRIPTION Whenever you use L as a function, a kitten using L dies. Normally, the kittens would be helpless, but if they use L (the module whose docs you are reading), the kittens can live long and prosper. This module replaces C with a version that makes sure that, when called as a function on objects which override C, C will call the appropriate method on those objects In all other cases, the real C gets called directly. B You should use this module only for debugging purposes. It does not belong as a dependency in running code. =head1 WARNINGS If the lexical warnings pragma is available, this module will emit a warning for each naughty invocation of C. Silence these warnings by saying: no warnings 'UNIVERSAL::isa'; in the lexical scope of the naughty code. After version 1.00, warnings only appear when naughty code calls UNIVERSAL::isa() as a function on an invocant for which there is an overridden isa(). These are really truly I bugs, and you should fix them rather than relying on this module to find them. To get warnings for all potentially dangerous uses of UNIVERSAL::isa() as a function, not a method (that is, for I uses of the method as a function, which are latent bugs, if not bugs that will break your code as it exists now), pass the C flag when using the module. This can generate many extra warnings, but they're more specific as to the actual wrong practice and they usually suggest proper fixes. =head1 SEE ALSO L L for another discussion of the problem at hand. L for one example of a module that really needs to override C. Any decent explanation of OO to understand why calling methods as functions is a staggeringly bad idea. =head1 AUTHORS Audrey Tang chromatic Yuval Kogman =head1 COPYRIGHT & LICENSE Copyright (c) 2005 - 2011, chromatic. This module is made available under the same terms as Perl 5.12. =cut