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 $args{optimized};
- # FIXME
- if(blessed($check)){
- $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 $self = shift;
- return ref($self)->new(@_, parent => $self);
+ return ref($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 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 {
}
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 $value";
}
}
my($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 = $other) =~ s/\s+//g;
return 0;
}
-sub _compile{
- my($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;
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
projects / gitmo/Mouse.git / blobdiff