X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FAttribute.pm;h=4bdb9f8167b0077ac8a323b9b883fc8c2d2d34f0;hb=cbdd0fa406d4f9d23a0d6a17891daf995e4c84c5;hp=af9e737602b1377a6048b6c5003d361bf42da1e3;hpb=f7b11a21869769d2b49bba4fa72d33fa54ad0c2e;p=gitmo%2FMouse.git

diff --git a/lib/Mouse/Meta/Attribute.pm b/lib/Mouse/Meta/Attribute.pm
index af9e737..4bdb9f8 100644
--- a/lib/Mouse/Meta/Attribute.pm
+++ b/lib/Mouse/Meta/Attribute.pm
@@ -17,23 +17,6 @@ sub new {
 
     $args{is} ||= '';
 
-    if ($args{lazy_build}) {
-        confess("You can not use lazy_build and default for the same attribute $name")
-            if exists $args{default};
-        $args{lazy}      = 1;
-        $args{required}  = 1;
-        $args{builder}   = "_build_${name}"
-            if !exists($args{builder});
-        if ($name =~ /^_/) {
-            $args{clearer}   = "_clear${name}" if !exists($args{clearer});
-            $args{predicate} = "_has${name}" if !exists($args{predicate});
-        }
-        else {
-            $args{clearer}   = "clear_${name}" if !exists($args{clearer});
-            $args{predicate} = "has_${name}" if !exists($args{predicate});
-        }
-    }
-
     bless \%args, $class;
 }
 
@@ -73,11 +56,15 @@ sub generate_accessor {
     my $name       = $attribute->name;
     my $key        = $name;
     my $default    = $attribute->default;
-    my $trigger    = $attribute->trigger;
     my $type       = $attribute->type_constraint;
     my $constraint = $attribute->find_type_constraint;
     my $builder    = $attribute->builder;
 
+    my $trigger = $attribute->trigger;
+    my $before  = $trigger->{before};
+    my $after   = $trigger->{after};
+    my $around  = $trigger->{around};
+
     my $accessor = 'sub {
         my $self = shift;';
 
@@ -85,21 +72,36 @@ sub generate_accessor {
         $accessor .= 'if (@_) {
             local $_ = $_[0];';
 
-        if ($constraint) {
-            $accessor .= 'do {
-                my $display = defined($_) ? overload::StrVal($_) : "undef";
-                Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display") unless $constraint->();
-            };'
+        if ($before) {
+            $accessor .= '$before->($self, $_, $attribute);';
         }
 
-        $accessor .= '$self->{$key} = $_;';
+        if ($around) {
+            $accessor .= '$around->(sub {
+                my $self = shift;
+                $_ = $_[0];
+            ';
+        }
+
+            if ($constraint) {
+                $accessor .= 'do {
+                    my $display = defined($_) ? overload::StrVal($_) : "undef";
+                    Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display") unless $constraint->();
+                };'
+            }
+
+            $accessor .= '$self->{$key} = $_;';
 
-        if ($attribute->is_weak_ref) {
-            $accessor .= 'Scalar::Util::weaken($self->{$key}) if ref($self->{$key});';
+            if ($attribute->is_weak_ref) {
+                $accessor .= 'Scalar::Util::weaken($self->{$key}) if ref($self->{$key});';
+            }
+
+        if ($around) {
+            $accessor .= '}, $self, $_, $attribute);';
         }
 
-        if ($trigger) {
-            $accessor .= '$trigger->($self, $_, $attribute);';
+        if ($after) {
+            $accessor .= '$after->($self, $_, $attribute);';
         }
 
         $accessor .= '}';
@@ -184,7 +186,8 @@ sub create {
     $args{name} = $name;
     $args{class} = $class;
 
-    $self->validate_args($name, %args);
+    %args = $self->canonicalize_args($name, %args);
+    $self->validate_args($name, \%args);
 
     $args{type_constraint} = delete $args{isa}
         if exists $args{isa};
@@ -224,25 +227,65 @@ sub create {
     return $attribute;
 }
 
-sub validate_args {
+sub canonicalize_args {
     my $self = shift;
     my $name = shift;
     my %args = @_;
 
+    if ($args{lazy_build}) {
+        $args{lazy}      = 1;
+        $args{required}  = 1;
+        $args{builder}   = "_build_${name}"
+            if !exists($args{builder});
+        if ($name =~ /^_/) {
+            $args{clearer}   = "_clear${name}" if !exists($args{clearer});
+            $args{predicate} = "_has${name}" if !exists($args{predicate});
+        }
+        else {
+            $args{clearer}   = "clear_${name}" if !exists($args{clearer});
+            $args{predicate} = "has_${name}" if !exists($args{predicate});
+        }
+    }
+
+    return %args;
+}
+
+sub validate_args {
+    my $self = shift;
+    my $name = shift;
+    my $args = shift;
+
+    confess "You can not use lazy_build and default for the same attribute ($name)"
+        if $args->{lazy_build} && exists $args->{default};
+
     confess "You cannot have lazy attribute ($name) without specifying a default value for it"
-        if $args{lazy} && !exists($args{default}) && !exists($args{builder});
+        if $args->{lazy}
+        && !exists($args->{default})
+        && !exists($args->{builder});
 
     confess "References are not allowed as default values, you must wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])"
-        if ref($args{default})
-        && ref($args{default}) ne 'CODE';
+        if ref($args->{default})
+        && ref($args->{default}) ne 'CODE';
 
     confess "You cannot auto-dereference without specifying a type constraint on attribute $name"
-        if $args{auto_deref} && !exists($args{isa});
+        if $args->{auto_deref} && !exists($args->{isa});
 
     confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute $name"
-        if $args{auto_deref}
-        && $args{isa} ne 'ArrayRef'
-        && $args{isa} ne 'HashRef';
+        if $args->{auto_deref}
+        && $args->{isa} ne 'ArrayRef'
+        && $args->{isa} ne 'HashRef';
+
+    if ($args->{trigger}) {
+        if (ref($args->{trigger}) eq 'CODE') {
+            $args->{trigger} = {
+                after => $args->{trigger},
+            };
+        }
+
+        confess "Trigger must be a CODE or HASH ref on attribute ($name)"
+            if $args->{trigger}
+            && ref($args->{trigger}) ne 'HASH';
+    }
 
     return 1;
 }
@@ -403,6 +446,16 @@ this attribute's type constraint;
 Checks that the given value passes this attribute's type constraint. Returns 1
 on success, otherwise C<confess>es.
 
+=head2 canonicalize_args Name, %args -> %args
+
+Canonicalizes some arguments to create. In particular, C<lazy_build> is
+canonicalized into C<lazy>, C<builder>, etc.
+
+=head2 validate_args Name, \%args -> 1 | ERROR
+
+Checks that the arguments to create the attribute (ie those specified by
+C<has>) are valid.
+
 =head2 clone_parent OwnerClass, AttributeName, %args -> Mouse::Meta::Attribute
 
 Creates a new attribute in OwnerClass, inheriting options from parent classes.