X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FTypeConstraint.pm;h=1a0b9a3a1200c63d59aa7945353fa1f4f1acfb79;hp=caeb98081d8ca420bc2f920c84a6abcf2823cfae;hb=cc1318893656996b0892fa5809c1f12d4b765a9f;hpb=e98220ab1bfe3cafe6121d5c91c1547bd93199fb

diff --git a/lib/Mouse/Meta/TypeConstraint.pm b/lib/Mouse/Meta/TypeConstraint.pm
index caeb980..1a0b9a3 100644
--- a/lib/Mouse/Meta/TypeConstraint.pm
+++ b/lib/Mouse/Meta/TypeConstraint.pm
@@ -1,77 +1,163 @@
 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
-    fallback => 1;
-
-use Carp qw(confess);
-use Scalar::Util qw(blessed reftype);
+    'bool'   => sub (){ 1 },           # always true
+    '""'     => sub { $_[0]->name },   # stringify to tc name
+    '|'      => sub {                  # or-combination
+        require Mouse::Util::TypeConstraints;
+        return Mouse::Util::TypeConstraints::find_or_parse_type_constraint(
+            "$_[0] | $_[1]",
+        );
+    },
 
-use Mouse::Util qw(:meta);
+    fallback => 1;
 
-my $null_check = sub { 1 };
+use Carp         ();
 
 sub new {
     my($class, %args) = @_;
 
     $args{name} = '__ANON__' if !defined $args{name};
 
-    my $check = $args{_compiled_type_constraint} || $args{constraint};
+    my $check = delete $args{optimized};
 
-    if(blessed($check)){
-        Carp::cluck("'constraint' must be a CODE reference");
-        $check = $check->{_compiled_type_constraint};
+    if($check){
+        $args{hand_optimized_type_constraint} = $check;
+        $args{compiled_type_constraint}       = $check;
     }
 
+    $check = $args{constraint};
+
     if(defined($check) && ref($check) ne 'CODE'){
-        confess("Type constraint for $args{name} is not a CODE reference");
+        Carp::confess("Constraint for $args{name} is not a CODE reference");
     }
 
     my $self = bless \%args, $class;
-    $self->{_compiled_type_constraint} ||= $self->_compile();
+    $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint};
 
+    $self->_compile_union_type_coercion() if $self->{type_constraints};
     return $self;
 }
 
 sub create_child_type{
     my $self = shift;
-    # XXX: FIXME
     return ref($self)->new(
-        %{$self},                            # pass the inherit parent attributes
-        _compiled_type_constraint => undef,  # ... other than compiled type constraint
-        @_,                                  # ... and args
-        parent => $self                      # ... and the parent
+        # a child inherits its parent's attributes
+        %{$self},
+
+        # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint'
+        compiled_type_constraint       => undef,
+        hand_optimized_type_constraint => undef,
+
+        # and is given child-specific args, of course.
+        @_,
+
+        # and its parent
+        parent => $self,
    );
 }
 
-sub name    { $_[0]->{name}    }
-sub parent  { $_[0]->{parent}  }
-sub message { $_[0]->{message} }
+sub name;
+sub parent;
+sub message;
+sub has_coercion;
 
-sub check {
+sub type_parameter;
+sub __is_parameterized;
+
+sub _compiled_type_constraint;
+sub _compiled_type_coercion;
+
+sub compile_type_constraint;
+
+sub _add_type_coercions{
     my $self = shift;
-    $self->{_compiled_type_constraint}->(@_);
+
+    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}){
+            Carp::confess("A coercion action already exists for '$from'");
+        }
+
+        my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from)
+            or Carp::confess("Could not find the type constraint ($from) to coerce from");
+
+        push @{$coercions}, [ $type => $action ];
+    }
+
+    # compile
+    if(exists $self->{type_constraints}){ # union type
+        Carp::confess("Cannot add additional type coercions to Union types");
+    }
+    else{
+        $self->_compile_type_coercion();
+    }
+    return;
 }
 
-sub validate {
-    my ($self, $value) = @_;
-    if ($self->{_compiled_type_constraint}->($value)) {
-        return undef;
+sub _compile_type_coercion {
+    my($self) = @_;
+
+    my @coercions = @{$self->{coercion_map}};
+
+    $self->{_compiled_type_coercion} = sub {
+       my($thing) = @_;
+       foreach my $pair (@coercions) {
+            #my ($constraint, $converter) = @$pair;
+            if ($pair->[0]->check($thing)) {
+              local $_ = $thing;
+              return $pair->[1]->($thing);
+            }
+       }
+       return $thing;
+    };
+    return;
+}
+
+sub _compile_union_type_coercion {
+    my($self) = @_;
+
+    my @coercions;
+    foreach my $type(@{$self->{type_constraints}}){
+        if($type->has_coercion){
+            push @coercions, $type;
+        }
     }
-    else {
-        $self->get_message($value);
+    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;
 }
 
-sub assert_valid {
-    my ($self, $value) = @_;
+sub check {
+    my $self = shift;
+    return $self->_compiled_type_constraint->(@_);
+}
 
-    my $error = $self->validate($value);
-    return 1 if ! defined $error;
+sub coerce {
+    my $self = shift;
+
+    my $coercion = $self->_compiled_type_coercion;
+    if(!$coercion){
+        Carp::confess("Cannot coerce without a type coercion");
+    }
+
+    return $_[0] if $self->_compiled_type_constraint->(@_);
 
-    confess($error);
+    return  $coercion->(@_);
 }
 
 sub get_message {
@@ -82,10 +168,7 @@ sub get_message {
     }
     else {
         $value = ( defined $value ? overload::StrVal($value) : 'undef' );
-        return
-            "Validation failed for '"
-          . $self->name
-          . "' failed with value $value";
+        return "Validation failed for '$self' failed with value $value";
     }
 }
 
@@ -93,7 +176,7 @@ sub is_a_type_of{
     my($self, $other) = @_;
 
     # ->is_a_type_of('__ANON__') is always false
-    return 0 if !blessed($other) && $other eq '__ANON__';
+    return 0 if !ref($other) && $other eq '__ANON__';
 
     (my $other_name = $other) =~ s/\s+//g;
 
@@ -112,47 +195,35 @@ sub is_a_type_of{
     return 0;
 }
 
-sub _compile{
-    my($self) = @_;
+# See also Moose::Meta::TypeConstraint::Parameterizable
+sub parameterize{
+    my($self, $param, $name) = @_;
 
-    # add parents first
-    my @checks;
-    for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){
-        if($parent->{constraint}){
-            push @checks, $parent->{constraint};
-         }
-         elsif($parent->{_compiled_type_constraint} && $parent->{_compiled_type_constraint} != $null_check){
-            # hand-optimized constraint
-            push @checks, $parent->{_compiled_type_constraint};
-            last;
-        }
-    }
-    # then add child
-    if($self->{constraint}){
-        push @checks, $self->{constraint};
+    if(!ref $param){
+        require Mouse::Util::TypeConstraints;
+        $param = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($param);
     }
 
-    if(@checks == 0){
-        return $null_check;
-    }
-    elsif(@checks == 1){
-        my $c = $checks[0];
-        return sub{
-            my(@args) = @_;
-            local $_ = $args[0];
-            return $c->(@args);
-        };
-    }
-    else{
-        return sub{
-            my(@args) = @_;
-            local $_ = $args[0];
-            foreach my $c(@checks){
-                return undef if !$c->(@args);
-            }
-            return 1;
-        };
+    $name ||= sprintf '%s[%s]', $self->name, $param->name;
+
+    my $generator = $self->{constraint_generator}
+        || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type");
+
+    return Mouse::Meta::TypeConstraint->new(
+        name           => $name,
+        parent         => $self,
+        type_parameter => $param,
+        constraint     => $generator->($param), # must be 'constraint', not 'optimized'
+    );
+}
+
+sub assert_valid {
+    my ($self, $value) = @_;
+
+    if(!$self->_compiled_type_constraint->($value)){
+        Carp::confess($self->get_message($value));
     }
+    return 1;
 }
 
 1;
@@ -162,6 +233,10 @@ __END__
 
 Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
 
+=head1 VERSION
+
+This document describes Mouse version 0.50_03
+
 =head1 DESCRIPTION
 
 For the most part, the only time you will ever encounter an