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
use Carp qw(confess);
use Scalar::Util qw(blessed reftype);
-use Mouse::Util qw(:meta);
-
my $null_check = sub { 1 };
sub new {
$args{name} = '__ANON__' if !defined $args{name};
- my $check = $args{_compiled_type_constraint} || $args{constraint};
+ my $check = delete $args{optimized};
+
+ if($args{_compiled_type_constraint}){
+ Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead")
+ if _MOUSE_VERBOSE;
+
+ $check = $args{_compiled_type_constraint};
+ }
+
+ if($check){
+ $args{hand_optimized_type_constraint} = $check;
+ $args{compiled_type_constraint} = $check;
+ }
+
+ $check = $args{constraint};
- # FIXME
if(blessed($check)){
- $check = $check->{_compiled_type_constraint};
+ Carp::cluck("Constraint for $args{name} must be a CODE reference");
+ $check = $check->{compiled_type_constraint};
}
if(defined($check) && ref($check) ne 'CODE'){
- confess("Type constraint for $args{name} is not a CODE reference");
+ confess("Constraint for $args{name} is not a CODE reference");
}
+ $args{package_defined_in} ||= caller;
+
my $self = bless \%args, $class;
- $self->{_compiled_type_constraint} ||= $self->_compile();
+ $self->compile_type_constraint() if !$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;
}
sub create_child_type{
my $self = shift;
- return ref($self)->new(@_, parent => $self);
+ # XXX: FIXME
+ return ref($self)->new(
+ # 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 check {
- my $self = shift;
- $self->{_compiled_type_constraint}->(@_);
+sub _compiled_type_constraint{ $_[0]->{compiled_type_constraint} }
+
+sub has_coercion{ exists $_[0]->{_compiled_type_coercion} }
+
+sub compile_type_constraint{
+ my($self) = @_;
+
+ # add parents first
+ my @checks;
+ for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){
+ if($parent->{hand_optimized_type_constraint}){
+ push @checks, $parent->{hand_optimized_type_constraint};
+ last; # a hand optimized constraint must include all the parents
+ }
+ elsif($parent->{constraint}){
+ push @checks, $parent->{constraint};
+ }
+ }
+
+ # then add child
+ if($self->{constraint}){
+ push @checks, $self->{constraint};
+ }
+
+ if($self->{type_constraints}){ # Union
+ my @types = map{ $_->_compiled_type_constraint } @{ $self->{type_constraints} };
+ push @checks, sub{
+ foreach my $c(@types){
+ return 1 if $c->($_[0]);
+ }
+ return 0;
+ };
+ }
+
+ if(@checks == 0){
+ $self->{compiled_type_constraint} = $null_check;
+ }
+ elsif(@checks == 1){
+ my $c = $checks[0];
+ $self->{compiled_type_constraint} = sub{
+ my(@args) = @_;
+ local $_ = $args[0];
+ return $c->(@args);
+ };
+ }
+ else{
+ $self->{compiled_type_constraint} = sub{
+ my(@args) = @_;
+ local $_ = $args[0];
+ foreach my $c(@checks){
+ return undef if !$c->(@args);
+ }
+ return 1;
+ };
+ }
+ return;
}
-sub validate {
- my ($self, $value) = @_;
- if ($self->{_compiled_type_constraint}->($value)) {
- return undef;
+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 ];
}
- else {
- $self->get_message($value);
+
+ # 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 $thing;\r
+ };
}
+ return;
}
-sub assert_valid {
- my ($self, $value) = @_;
+sub check {
+ my $self = shift;
+ return $self->_compiled_type_constraint->(@_);
+}
+
+sub coerce {
+ my $self = shift;
+ if(!$self->{_compiled_type_coercion}){
+ confess("Cannot coerce without a type coercion ($self)");
+ }
- my $error = $self->validate($value);
- return 1 if ! defined $error;
+ return $_[0] if $self->_compiled_type_constraint->(@_);
- confess($error);
+ return $self->{_compiled_type_coercion}->(@_);
}
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 $value";
}
}
return 0;
}
-sub _compile{
- my($self) = @_;
-
- # 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(@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;
- };
- }
-}
1;
__END__
Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
+=head1 VERSION
+
+This document describes Mouse version 0.37_06
+
=head1 DESCRIPTION
For the most part, the only time you will ever encounter an
projects / gitmo/Mouse.git / blobdiff