X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FClass%2FC3.pm;h=73e8228627a17b107c8af6b286c8ce7aac5f21ce;hb=f4a893b2743451ba7414466464e0e8d843458cfa;hp=a2f4740a0bd9158341609ab9aed04f3dd24a538e;hpb=322a5920b5c506789a9daf817374fd9f0df20ab5;p=gitmo%2FClass-C3.git

diff --git a/lib/Class/C3.pm b/lib/Class/C3.pm
index a2f4740..73e8228 100644
--- a/lib/Class/C3.pm
+++ b/lib/Class/C3.pm
@@ -7,7 +7,7 @@ use warnings;
 use Scalar::Util 'blessed';
 use Algorithm::C3;
 
-our $VERSION = '0.12';
+our $VERSION = '0.13';
 
 # this is our global stash of both 
 # MRO's and method dispatch tables
@@ -67,15 +67,16 @@ sub reinitialize {
 ## functions for applying C3 to classes
 
 sub _calculate_method_dispatch_tables {
+    my %merge_cache;
     foreach my $class (keys %MRO) {
-        _calculate_method_dispatch_table($class);
+        _calculate_method_dispatch_table($class, \%merge_cache);
     }
 }
 
 sub _calculate_method_dispatch_table {
-    my $class = shift;
+    my ($class, $merge_cache) = @_;
     no strict 'refs';
-    my @MRO = calculateMRO($class);
+    my @MRO = calculateMRO($class, $merge_cache);
     $MRO{$class} = { MRO => \@MRO };
     my $has_overload_fallback = 0;
     my %methods;
@@ -139,11 +140,11 @@ sub _remove_method_dispatch_table {
 ## functions for calculating C3 MRO
 
 sub calculateMRO {
-    my ($class) = @_;
+    my ($class, $merge_cache) = @_;
     return Algorithm::C3::merge($class, sub { 
         no strict 'refs'; 
         @{$_[0] . '::ISA'};
-    });
+    }, $merge_cache);
 }
 
 package  # hide me from PAUSE
@@ -158,8 +159,10 @@ our $VERSION = '0.05';
 
 our %METHOD_CACHE;
 
-sub _find {
-    my $level = 2;
+sub method {
+    my $indirect = caller() =~ /^(?:next|maybe::next)$/;
+    my $level = $indirect ? 2 : 1;
+     
     my ($method_caller, $label, @label);
     while ($method_caller = (caller($level++))[3]) {
       @label = (split '::', $method_caller);
@@ -172,7 +175,7 @@ sub _find {
     my $self     = $_[0];
     my $class    = blessed($self) || $self;
     
-    return $METHOD_CACHE{"$class|$caller|$label"} ||= do {
+    my $method = $METHOD_CACHE{"$class|$caller|$label"} ||= do {
         
         my @MRO = Class::C3::calculateMRO($class);
         
@@ -189,15 +192,27 @@ sub _find {
             last if (defined ($found = *{$class . '::' . $label}{CODE}));
         }
         
-        die "No next::method '$label' found for $_[0]" if $_[1] && !$found;
-        
         $found;
     };
+
+    return $method if $indirect;
+
+    die "No next::method '$label' found for $self" if !$method;
+
+    goto &{$method};
 }
 
-sub method { goto &{_find($_[0], 1)} }
+sub can { method($_[0]) }
 
-sub can { return _find($_[0], 0) ? 1 : 0 }
+package  # hide me from PAUSE
+    maybe::next; 
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+sub method { (next::method($_[0]) || return)->(@_) }
 
 1;
 
@@ -406,6 +421,10 @@ You can use C<next::can> to see if C<next::method> will succeed before you call
 
   $self->next::method(@_) if $self->next::can; 
 
+Additionally, you can use C<maybe::next::method> as a shortcut to only call the next method if it exists. 
+The previous example could be simply written as:
+
+  $self->maybe::next::method(@_);
 
 There are some caveats about using C<next::method>, see below for those.
 
@@ -534,6 +553,9 @@ and finding many bugs and providing fixes.
 =item Thanks to Justin Guenther for making C<next::method> more robust by handling 
 calls inside C<eval> and anon-subs.
 
+=item Thanks to Robert Norris for adding support for C<next::can> and 
+C<maybe::next::method>.
+
 =back
 
 =head1 AUTHOR
@@ -549,4 +571,4 @@ L<http://www.iinteractive.com>
 This library is free software; you can redistribute it and/or modify
 it under the same terms as Perl itself. 
 
-=cut
\ No newline at end of file
+=cut