Implement XS accessor generators

[gitmo/Mouse.git] / lib / Mouse / Meta / TypeConstraint.pm

diff --git a/lib/Mouse/Meta/TypeConstraint.pm b/lib/Mouse/Meta/TypeConstraint.pm
index 436f690..3eb6eb6 100644 (file)
--- a/lib/Mouse/Meta/TypeConstraint.pm
+++ b/lib/Mouse/Meta/TypeConstraint.pm
@@ -1,16 +1,13 @@
 package Mouse::Meta::TypeConstraint;
-use strict;
-use warnings;
+use Mouse::Util qw(:meta); # enables strict and warnings
 
 use overload
-    '""'     => sub { shift->{name} },   # stringify to tc name
+    '""'     => sub { $_[0]->name },   # stringify to tc name
     fallback => 1;
 
 use Carp qw(confess);
 use Scalar::Util qw(blessed reftype);
 
-use Mouse::Util qw(:meta);
-
 my $null_check = sub { 1 };
 
 sub new {
@@ -21,13 +18,10 @@ sub new {
     my $check = delete $args{optimized};
 
     if($args{_compiled_type_constraint}){
-        Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead");
-        $check = $args{_compiled_type_constraint};
+        Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead")
+            if _MOUSE_VERBOSE;
 
-        if(blessed($check)){
-            Carp::cluck("Constraint must be a CODE reference");
-            $check = $check->{compiled_type_constraint};
-        }
+        $check = $args{_compiled_type_constraint};
     }
 
     if($check){
@@ -37,11 +31,6 @@ sub new {
 
     $check = $args{constraint};
 
-    if(blessed($check)){
-        Carp::cluck("Constraint for $args{name} must be a CODE reference");
-        $check = $check->{compiled_type_constraint};
-    }
-
     if(defined($check) && ref($check) ne 'CODE'){
         confess("Constraint for $args{name} is not a CODE reference");
     }
@@ -51,6 +40,25 @@ sub new {
     my $self = bless \%args, $class;
     $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint};
 
+    if($self->{type_constraints}){ # Union
+        my @coercions;
+        foreach my $type(@{$self->{type_constraints}}){
+            if($type->has_coercion){
+                push @coercions, $type;
+            }
+        }
+        if(@coercions){
+            $self->{_compiled_type_coercion} = sub {
+                my($thing) = @_;
+                foreach my $type(@coercions){
+                    my $value = $type->coerce($thing);
+                    return $value if $self->check($value);
+                }
+                return $thing;
+            };
+        }
+    }
+
     return $self;
 }
 
@@ -73,12 +81,6 @@ sub create_child_type{
    );
 }
 
-sub name    { $_[0]->{name}    }
-sub parent  { $_[0]->{parent}  }
-sub message { $_[0]->{message} }
-
-sub _compiled_type_constraint{ $_[0]->{compiled_type_constraint} }
-
 
 sub compile_type_constraint{
     my($self) = @_;
@@ -87,11 +89,11 @@ sub compile_type_constraint{
     my @checks;
     for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){
          if($parent->{hand_optimized_type_constraint}){
-            push @checks, $parent->{hand_optimized_type_constraint};
+            unshift @checks, $parent->{hand_optimized_type_constraint};
             last; # a hand optimized constraint must include all the parents
         }
         elsif($parent->{constraint}){
-            push @checks, $parent->{constraint};
+            unshift @checks, $parent->{constraint};
         }
     }
 
@@ -134,9 +136,58 @@ sub compile_type_constraint{
     return;
 }
 
+sub _add_type_coercions{
+    my $self = shift;
+
+    my $coercions = ($self->{_coercion_map} ||= []);
+    my %has       = map{ $_->[0] => undef } @{$coercions};
+
+    for(my $i = 0; $i < @_; $i++){
+        my $from   = $_[  $i];
+        my $action = $_[++$i];
+
+        if(exists $has{$from}){
+            confess("A coercion action already exists for '$from'");
+        }
+
+        my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from)
+            or confess("Could not find the type constraint ($from) to coerce from");
+
+        push @{$coercions}, [ $type => $action ];
+    }
+
+    # compile
+    if(exists $self->{type_constraints}){ # union type
+        confess("Cannot add additional type coercions to Union types");
+    }
+    else{
+        $self->{_compiled_type_coercion} = sub {
+           my($thing) = @_;\r
+           foreach my $pair (@{$coercions}) {\r
+                #my ($constraint, $converter) = @$pair;\r
+                if ($pair->[0]->check($thing)) {\r
+                  local $_ = $thing;
+                  return $pair->[1]->($thing);
+                }\r
+           }\r
+           return $thing;\r
+        };
+    }
+    return;
+}
+
 sub check {
     my $self = shift;
-    $self->_compiled_type_constraint->(@_);
+    return $self->_compiled_type_constraint->(@_);
+}
+
+sub coerce {
+    my $self = shift;
+
+    return $_[0] if $self->_compiled_type_constraint->(@_);
+
+    my $coercion = $self->_compiled_type_coercion;
+    return $coercion ? $coercion->(@_) : $_[0];
 }
 
 sub get_message {
@@ -182,6 +233,10 @@ __END__
 
 Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
 
+=head1 VERSION
+
+This document describes Mouse version 0.40
+
 =head1 DESCRIPTION
 
 For the most part, the only time you will ever encounter an