-#!/usr/bin/env perl
package Mouse::Util;
use strict;
use warnings;
-use Exporter 'import';
-use Carp;
+use base qw/Exporter/;
+use Carp qw(confess);
+use B ();
our @EXPORT_OK = qw(
- blessed
get_linear_isa
- looks_like_number
- openhandle
- reftype
- weaken
+ apply_all_roles
+ get_code_info
);
our %EXPORT_TAGS = (
all => \@EXPORT_OK,
);
-# We only have to do this nastiness if we haven't loaded XS version of
-# Mouse.pm, so check if we're running under PurePerl or not
BEGIN {
- if ($Mouse::PurePerl) {
- my %dependencies = (
- 'Scalar::Util' => {
- # VVVVV CODE TAKEN FROM SCALAR::UTIL VVVVV
- 'blessed' => do {
- *UNIVERSAL::a_sub_not_likely_to_be_here = sub {
- my $ref = ref($_[0]);
-
- # deviation from Scalar::Util
- # XS returns undef, PP returns GLOB.
- # let's make that more consistent by having PP return
- # undef if it's a GLOB. :/
-
- # \*STDOUT would be allowed as an object in PP blessed
- # but not XS
- return $ref eq 'GLOB' ? undef : $ref;
- };
-
- sub {
- local($@, $SIG{__DIE__}, $SIG{__WARN__});
- length(ref($_[0]))
- ? eval { $_[0]->a_sub_not_likely_to_be_here }
- : undef;
- },
- },
- 'looks_like_number' => sub {
- local $_ = shift;
-
- # checks from perlfaq4
- return 0 if !defined($_) or ref($_);
- return 1 if (/^[+-]?\d+$/); # is a +/- integer
- return 1 if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); # a C float
- return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006001 and /^Inf$/i);
-
- 0;
- },
- 'reftype' => sub {
- local($@, $SIG{__DIE__}, $SIG{__WARN__});
- my $r = shift;
- my $t;
-
- length($t = ref($r)) or return undef;
-
- # This eval will fail if the reference is not blessed
- eval { $r->a_sub_not_likely_to_be_here; 1 }
- ? do {
- $t = eval {
- # we have a GLOB or an IO. Stringify a GLOB gives it's name
- my $q = *$r;
- $q =~ /^\*/ ? "GLOB" : "IO";
- }
- or do {
- # OK, if we don't have a GLOB what parts of
- # a glob will it populate.
- # NOTE: A glob always has a SCALAR
- local *glob = $r;
- defined *glob{ARRAY} && "ARRAY"
- or defined *glob{HASH} && "HASH"
- or defined *glob{CODE} && "CODE"
- or length(ref(${$r})) ? "REF" : "SCALAR";
- }
- }
- : $t
- },
- 'openhandle' => sub {
- my $fh = shift;
- my $rt = reftype($fh) || '';
-
- return defined(fileno($fh)) ? $fh : undef
- if $rt eq 'IO';
-
- if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA)
- $fh = \(my $tmp=$fh);
- }
- elsif ($rt ne 'GLOB') {
- return undef;
- }
-
- (tied(*$fh) or defined(fileno($fh)))
- ? $fh : undef;
- },
- weaken => {
- loaded => \&Scalar::Util::weaken,
- not_loaded => sub { die "Scalar::Util required for weak reference support" },
- },
- # ^^^^^ CODE TAKEN FROM SCALAR::UTIL ^^^^^
- },
- 'MRO::Compat' => {
- # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV
- 'get_linear_isa' => {
- loaded => \&mro::get_linear_isa,
- not_loaded => do {
- # this recurses so it isn't pretty
- my $code;
- $code = sub {
- no strict 'refs';
-
- my $classname = shift;
-
- my @lin = ($classname);
- my %stored;
- foreach my $parent (@{"$classname\::ISA"}) {
- my $plin = $code->($parent);
- foreach (@$plin) {
- next if exists $stored{$_};
- push(@lin, $_);
- $stored{$_} = 1;
- }
- }
- return \@lin;
- }
- },
- },
- # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^
- },
- );
-
- my %loaded;
- for my $module_name (keys %dependencies) {
- my $loaded = do {
- local $SIG{__DIE__} = 'DEFAULT';
- eval "require $module_name; 1";
- };
-
- $loaded{$module_name} = $loaded;
-
- for my $method_name (keys %{ $dependencies{ $module_name } }) {
- my $producer = $dependencies{$module_name}{$method_name};
- my $implementation;
-
- if (ref($producer) eq 'HASH') {
- $implementation = $loaded
- ? $producer->{loaded}
- : $producer->{not_loaded};
- }
- else {
- $implementation = $loaded
- ? $module_name->can($method_name)
- : $producer;
- }
-
- no strict 'refs';
- *{ __PACKAGE__ . '::' . $method_name } = $implementation;
- }
- }
+ my $impl;
+ if ($] >= 5.009_005) {
+ require mro;
+ $impl = \&mro::get_linear_isa;
} else {
- # If we're running under XS, we can provide
- # blessed
- # looks_like_number
- # reftype
- # weaken
- # other functions need to be loaded from our respective sources
-
- if (defined &Scalar::Util::openhandle || eval { require Scalar::Util; 1 }) {
- *openhandle = \&Scalar::Util::openhandle;
- } else {
- # XXX - room for improvement
- *openhandle = sub {
- my $fh = shift;
- my $rt = reftype($fh) || '';
-
- return defined(fileno($fh)) ? $fh : undef
- if $rt eq 'IO';
-
- if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA)
- $fh = \(my $tmp=$fh);
- }
- elsif ($rt ne 'GLOB') {
- return undef;
- }
-
- (tied(*$fh) or defined(fileno($fh)))
- ? $fh : undef;
- };
- }
-
- if (defined &mro::get_linear_isa || eval { require MRO::Compat; 1; }) {
- *get_linear_isa = \&mro::get_linear_isa;
+ my $e = do {
+ local $@;
+ eval { require MRO::Compat };
+ $@;
+ };
+ if (!$e) {
+ $impl = \&mro::get_linear_isa;
} else {
- # this recurses so it isn't pretty
- my $code;
- *get_linear_isa = $code = sub {
+# VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV
+ my $_get_linear_isa_dfs; # this recurses so it isn't pretty
+ $_get_linear_isa_dfs = sub {
no strict 'refs';
my $classname = shift;
my @lin = ($classname);
my %stored;
foreach my $parent (@{"$classname\::ISA"}) {
- my $plin = $code->($parent);
- foreach (@$plin) {
- next if exists $stored{$_};
- push(@lin, $_);
- $stored{$_} = 1;
+ my $plin = $_get_linear_isa_dfs->($parent);
+ foreach my $p(@$plin) {
+ next if exists $stored{$p};
+ push(@lin, $p);
+ $stored{$p} = 1;
}
}
return \@lin;
};
+# ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^
+ $impl = $_get_linear_isa_dfs;
}
}
+
+
+ no warnings 'once';
+ *get_linear_isa = $impl;
}
-sub apply_all_roles {
- my $meta = Mouse::Meta::Class->initialize(shift);
- my $role = shift;
- confess "Mouse::Util only supports 'apply_all_roles' on individual roles at a time" if @_;
+{ # taken from Sub::Identify
+ sub get_code_info($) {\r
+ my ($coderef) = @_;\r
+ ref($coderef) or return;\r
+
+ my $cv = B::svref_2object($coderef);\r
+ $cv->isa('B::CV') or return;
- Mouse::load_class($role);
- $role->meta->apply($meta);
+ my $gv = $cv->GV;\r
+ $gv->isa('B::GV') or return;\r
+\r
+ return ($gv->STASH->NAME, $gv->NAME);\r
+ }\r
}
-1;
+# taken from Class/MOP.pm
+{
+ my %cache;
-__END__
+ sub resolve_metaclass_alias {
+ my ( $type, $metaclass_name, %options ) = @_;
-=head1 NAME
+ my $cache_key = $type;
+ return $cache{$cache_key}{$metaclass_name}
+ if $cache{$cache_key}{$metaclass_name};
-Mouse::Util - features, with or without their dependencies
+ my $possible_full_name =
+ 'Mouse::Meta::'
+ . $type
+ . '::Custom::'
+ . $metaclass_name;
-=head1 IMPLEMENTATIONS FOR
+ my $loaded_class =
+ load_first_existing_class( $possible_full_name,
+ $metaclass_name );
-=head2 L<MRO::Compat>
+ return $cache{$cache_key}{$metaclass_name} =
+ $loaded_class->can('register_implementation')
+ ? $loaded_class->register_implementation
+ : $loaded_class;
+ }
+}
-=head3 get_linear_isa
+# taken from Class/MOP.pm
+sub is_valid_class_name {
+ my $class = shift;
-=head2 L<Scalar::Util>
+ return 0 if ref($class);
+ return 0 unless defined($class);
+ return 0 unless length($class);
-=head3 blessed
+ return 1 if $class =~ /^\w+(?:::\w+)*$/;
-=head3 looks_like_number
+ return 0;
+}
-=head3 reftype
+# taken from Class/MOP.pm
+sub load_first_existing_class {
+ my @classes = @_
+ or return;
+
+ my $found;
+ my %exceptions;
+ for my $class (@classes) {
+ unless ( is_valid_class_name($class) ) {
+ my $display = defined($class) ? $class : 'undef';
+ confess "Invalid class name ($display)";
+ }
-=head3 openhandle
+ my $e = _try_load_one_class($class);
-=head3 weaken
+ if ($e) {
+ $exceptions{$class} = $e;
+ }
+ else {
+ $found = $class;
+ last;
+ }
+ }
+ return $found if $found;
+
+ confess join(
+ "\n",
+ map {
+ sprintf( "Could not load class (%s) because : %s",
+ $_, $exceptions{$_} )
+ } @classes
+ );
+}
+
+# taken from Class/MOP.pm
+sub _try_load_one_class {
+ my $class = shift;
+
+ return if Mouse::is_class_loaded($class);
-C<weaken> I<must> be implemented in XS. If the user tries to use C<weaken>
-without L<Scalar::Util>, an error is thrown.
+ my $file = $class . '.pm';
+ $file =~ s{::}{/}g;
-=head2 Test::Exception
+ return do {
+ local $@;
+ eval { require($file) };
+ $@;
+ };
+}
+
+sub apply_all_roles {
+ my $meta = Mouse::Meta::Class->initialize(shift);
-=head3 throws_ok
+ my @roles;
-=head3 lives_ok
+ # Basis of Data::OptList
+ my $max = scalar(@_);
+ for (my $i = 0; $i < $max ; $i++) {
+ if ($i + 1 < $max && ref($_[$i + 1])) {
+ push @roles, [ $_[$i++] => $_[$i] ];
+ } else {
+ push @roles, [ $_[$i] => {} ];
+ }
+ }
+
+ foreach my $role_spec (@roles) {
+ Mouse::load_class( $role_spec->[0] );
+ }
+
+ ( $_->[0]->can('meta') && $_->[0]->meta->isa('Mouse::Meta::Role') )
+ || confess("You can only consume roles, "
+ . $_->[0]
+ . " is not a Moose role")
+ foreach @roles;
+
+ if ( scalar @roles == 1 ) {
+ my ( $role, $params ) = @{ $roles[0] };
+ $role->meta->apply( $meta, ( defined $params ? %$params : () ) );
+ }
+ else {
+ Mouse::Meta::Role->combine_apply($meta, @roles);
+ }
+ return;
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+Mouse::Util - features, with or without their dependencies
+
+=head1 IMPLEMENTATIONS FOR
+
+=head2 L<MRO::Compat>
+
+=head3 get_linear_isa
=cut