X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FUtil.pm;h=1e8d02854a898f5dc8a1f5bfcf948157abe773a3;hp=8452299080eb08ec068b786240fafef6dec60875;hb=6d28c5cf89bfd4c00e675e95aff6c31b61aeb805;hpb=6719984210754e8d012ae678536f194c35000823

diff --git a/lib/Mouse/Util.pm b/lib/Mouse/Util.pm
index 8452299..1e8d028 100644
--- a/lib/Mouse/Util.pm
+++ b/lib/Mouse/Util.pm
@@ -2,35 +2,64 @@ package Mouse::Util;
 use strict;
 use warnings;
 use base qw/Exporter/;
-use Carp;
+
+use Carp qw(confess);
+use B ();
 
 our @EXPORT_OK = qw(
-    get_linear_isa
+    find_meta
+    does_role
+    resolve_metaclass_alias
+    english_list
+
+    load_class
+    is_class_loaded
+
     apply_all_roles
-    version 
-    authority
-    identifier
+    not_supported
+
+    get_linear_isa
+    get_code_info
 );
 our %EXPORT_TAGS = (
     all  => \@EXPORT_OK,
 );
 
+# Moose::Util compatible utilities
+
+sub find_meta{
+    return Mouse::Meta::Module::class_of( $_[0] );
+}
+
+sub does_role{
+    my ($class_or_obj, $role) = @_;
+
+    my $meta = Mouse::Meta::Module::class_of($class_or_obj);
+
+    return 0 unless defined $meta;
+    return 1 if $meta->does_role($role);
+    return 0;
+}
+
+
+
 BEGIN {
     my $impl;
     if ($] >= 5.009_005) {
         require mro;
         $impl = \&mro::get_linear_isa;
     } else {
-        my $loaded = do {
-            local $SIG{__DIE__} = 'DEFAULT';
-            eval { require MRO::Compat; 1 };
+        my $e = do {
+            local $@;
+            eval { require MRO::Compat };
+            $@;
         };
-        if ($loaded) {
+        if (!$e) {
             $impl = \&mro::get_linear_isa;
         } else {
 #       VVVVV   CODE TAKEN FROM MRO::COMPAT   VVVVV
-            my $code; # this recurses so it isn't pretty
-            $code = sub {
+            my $_get_linear_isa_dfs; # this recurses so it isn't pretty
+            $_get_linear_isa_dfs = sub {
                 no strict 'refs';
 
                 my $classname = shift;
@@ -38,73 +67,73 @@ BEGIN {
                 my @lin = ($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 = $code;
+            $impl = $_get_linear_isa_dfs;
         }
     }
 
-    no strict 'refs';
-    *{ __PACKAGE__ . '::get_linear_isa'} = $impl;
-}
 
-{ # adapted from Class::MOP::Module
-
-    sub version { no strict 'refs'; ${shift->name.'::VERSION'} }
-    sub authority { no strict 'refs'; ${shift->name.'::AUTHORITY'} }  
-    sub identifier {
-        my $self = shift;
-        join '-' => (
-            $self->name,
-            ($self->version   || ()),
-            ($self->authority || ()),
-        );
-    }
+    no warnings 'once';
+    *get_linear_isa = $impl;
 }
 
-# taken from Class/MOP.pm
-{
-    my %cache;
-
-    sub resolve_metaclass_alias {
-        my ( $type, $metaclass_name, %options ) = @_;
+{ # taken from Sub::Identify
+    sub get_code_info($) {
+        my ($coderef) = @_;
+        ref($coderef) or return;
 
-        my $cache_key = $type;
-        return $cache{$cache_key}{$metaclass_name}
-          if $cache{$cache_key}{$metaclass_name};
+        my $cv = B::svref_2object($coderef);
+        $cv->isa('B::CV') or return;
 
-        my $possible_full_name =
-            'Mouse::Meta::' 
-          . $type
-          . '::Custom::'
-          . $metaclass_name;
+        my $gv = $cv->GV;
+        $gv->isa('B::GV') or return;
+
+        return ($gv->STASH->NAME, $gv->NAME);
+    }
+}
 
-        my $loaded_class =
-          load_first_existing_class( $possible_full_name,
-            $metaclass_name );
+# taken from Mouse::Util (0.90)
+{
+    my %cache;
 
-        return $cache{$cache_key}{$metaclass_name} =
-            $loaded_class->can('register_implementation')
-          ? $loaded_class->register_implementation
-          : $loaded_class;
+    sub resolve_metaclass_alias {
+        my ( $type, $metaclass_name, %options ) = @_;
+
+        my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );
+
+        return $cache{$cache_key}{$metaclass_name} ||= do{
+
+            my $possible_full_name = join '::',
+                'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name
+            ;
+
+            my $loaded_class = load_first_existing_class(
+                $possible_full_name,
+                $metaclass_name
+            );
+
+            $loaded_class->can('register_implementation')
+                ? $loaded_class->register_implementation
+                : $loaded_class;
+        };
     }
 }
 
 # taken from Class/MOP.pm
-sub _is_valid_class_name {
+sub is_valid_class_name {
     my $class = shift;
 
     return 0 if ref($class);
     return 0 unless defined($class);
-    return 0 unless length($class);
 
     return 1 if $class =~ /^\w+(?:::\w+)*$/;
 
@@ -116,13 +145,6 @@ sub load_first_existing_class {
     my @classes = @_
       or return;
 
-    foreach my $class (@classes) {
-        unless ( _is_valid_class_name($class) ) {
-            my $display = defined($class) ? $class : 'undef';
-            confess "Invalid class name ($display)";
-        }
-    }
-
     my $found;
     my %exceptions;
     for my $class (@classes) {
@@ -151,7 +173,12 @@ sub load_first_existing_class {
 sub _try_load_one_class {
     my $class = shift;
 
-    return if Mouse::is_class_loaded($class);
+    unless ( is_valid_class_name($class) ) {
+        my $display = defined($class) ? $class : 'undef';
+        confess "Invalid class name ($display)";
+    }
+
+    return if is_class_loaded($class);
 
     my $file = $class . '.pm';
     $file =~ s{::}{/}g;
@@ -163,6 +190,50 @@ sub _try_load_one_class {
     };
 }
 
+
+sub load_class {
+    my $class = shift;
+    my $e = _try_load_one_class($class);
+    confess "Could not load class ($class) because : $e" if $e;
+
+    return 1;
+}
+
+my %is_class_loaded_cache;
+sub is_class_loaded {
+    my $class = shift;
+
+    return 0 if ref($class) || !defined($class) || !length($class);
+
+    return 1 if $is_class_loaded_cache{$class};
+
+    # walk the symbol table tree to avoid autovififying
+    # \*{${main::}{"Foo::"}} == \*main::Foo::
+
+    my $pack = \%::;
+    foreach my $part (split('::', $class)) {
+        my $entry = \$pack->{$part . '::'};
+        return 0 if ref($entry) ne 'GLOB';
+        $pack = *{$entry}{HASH} or return 0;
+    }
+
+    # check for $VERSION or @ISA
+    return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION}
+             && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} };
+    return ++$is_class_loaded_cache{$class} if exists $pack->{ISA}
+             && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0;
+
+    # check for any method
+    foreach my $name( keys %{$pack} ) {
+        my $entry = \$pack->{$name};
+        return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE};
+    }
+
+    # fail
+    return 0;
+}
+
+
 sub apply_all_roles {
     my $meta = Mouse::Meta::Class->initialize(shift);
 
@@ -176,18 +247,12 @@ sub apply_all_roles {
         } else {
             push @roles, [ $_[$i] => {} ];
         }
+        my $role_name = $roles[-1][0];
+        load_class($role_name);
+        ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') )
+            || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role");
     }
 
-    foreach my $role_spec (@roles) {
-        Mouse::load_class( $role_spec->[0] );
-    }
-
-    ( $_->[0]->can('meta') && $_->[0]->meta->isa('Mouse::Meta::Role') )
-        || croak("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 : () ) );
@@ -195,7 +260,29 @@ sub apply_all_roles {
     else {
         Mouse::Meta::Role->combine_apply($meta, @roles);
     }
+    return;
+}
+
+# taken from Moose::Util 0.90
+sub english_list {
+    return $_[0] if @_ == 1;
+
+    my @items = sort @_;
+
+    return "$items[0] and $items[1]" if @items == 2;
+
+    my $tail = pop @items;
+
+    return join q{, }, @items, "and $tail";
+}
+
+sub not_supported{
+    my($feature) = @_;
+
+    $feature ||= ( caller(1) )[3]; # subroutine name
 
+    local $Carp::CarpLevel = $Carp::CarpLevel + 2;
+    Carp::croak("Mouse does not currently support $feature");
 }
 
 1;