X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FUtil.pm;h=bcb865eae420e12d0c4ef64330062fa45c7c9f1a;hp=53af4cfd9778d92690774bc86df58814c930056c;hb=ff6870694bb440c13826e0f0fa25e760247fd24e;hpb=52c48ad7f7cf12cefee9c6e15ab00289976e342b

diff --git a/lib/Mouse/Util.pm b/lib/Mouse/Util.pm
index 53af4cf..bcb865e 100644
--- a/lib/Mouse/Util.pm
+++ b/lib/Mouse/Util.pm
@@ -2,11 +2,16 @@ package Mouse::Util;
 use strict;
 use warnings;
 use base qw/Exporter/;
-use Carp;
+use Carp qw(confess);
+use B ();
 
 our @EXPORT_OK = qw(
+    load_class
+    is_class_loaded
     get_linear_isa
     apply_all_roles
+    get_code_info
+    not_supported
 );
 our %EXPORT_TAGS = (
     all  => \@EXPORT_OK,
@@ -18,16 +23,17 @@ BEGIN {
         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 $classname = shift;
@@ -35,22 +41,38 @@ BEGIN {
                 my @lin = ($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;
+
+    no warnings 'once';
+    *get_linear_isa = $impl;
+}
+
+{ # taken from Sub::Identify
+    sub get_code_info($) {
+        my ($coderef) = @_;
+        ref($coderef) or return;
+
+        my $cv = B::svref_2object($coderef);
+        $cv->isa('B::CV') or return;
+
+        my $gv = $cv->GV;
+        $gv->isa('B::GV') or return;
+
+        return ($gv->STASH->NAME, $gv->NAME);
+    }
 }
 
 # taken from Class/MOP.pm
@@ -82,12 +104,11 @@ BEGIN {
 }
 
 # 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 $class =~ /^\w+(?:::\w+)*$/;
 
@@ -99,13 +120,6 @@ 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) {
@@ -134,7 +148,12 @@ 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;
@@ -146,6 +165,50 @@ 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);
 
@@ -159,18 +222,12 @@ 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 : () ) );
@@ -178,7 +235,16 @@ sub apply_all_roles {
     else {
         Mouse::Meta::Role->combine_apply($meta, @roles);
     }
+    return;
+}
+
+sub not_supported{
+    my($feature) = @_;
+
+    $feature ||= ( caller(1) )[3]; # subroutine name
 
+    local $Carp::CarpLevel = $Carp::CarpLevel + 2;
+    Carp::croak("Mouse does not currently support $feature");
 }
 
 1;