/usr/lib/perl5/Mouse/Meta/TypeConstraint.pm is in libmouse-perl 0.97-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 | package Mouse::Meta::TypeConstraint;
use Mouse::Util qw(:meta); # enables strict and warnings
sub new {
my $class = shift;
my %args = @_ == 1 ? %{$_[0]} : @_;
$args{name} = '__ANON__' if !defined $args{name};
my $type_parameter;
if(defined $args{parent}) { # subtyping
%args = (%{$args{parent}}, %args);
# a child type must not inherit 'compiled_type_constraint'
# and 'hand_optimized_type_constraint' from the parent
delete $args{compiled_type_constraint}; # don't inherit it
delete $args{hand_optimized_type_constraint}; # don't inherit it
$type_parameter = $args{type_parameter};
if(defined(my $parent_tp = $args{parent}{type_parameter})) {
if($parent_tp != $type_parameter) {
$type_parameter->is_a_type_of($parent_tp)
or $class->throw_error(
"$type_parameter is not a subtype of $parent_tp",
);
}
else {
$type_parameter = undef;
}
}
}
my $check;
if($check = delete $args{optimized}) { # likely to be builtins
$args{hand_optimized_type_constraint} = $check;
$args{compiled_type_constraint} = $check;
}
elsif(defined $type_parameter) { # parameterizing
my $generator = $args{constraint_generator}
|| $class->throw_error(
"The $args{name} constraint cannot be used,"
. " because $type_parameter doesn't subtype"
. " from a parameterizable type");
my $parameterized_check = $generator->($type_parameter);
if(defined(my $my_check = $args{constraint})) {
$check = sub {
return $parameterized_check->($_) && $my_check->($_);
};
}
else {
$check = $parameterized_check;
}
$args{constraint} = $check;
}
else { # common cases
$check = $args{constraint};
}
if(defined($check) && ref($check) ne 'CODE'){
$class->throw_error(
"Constraint for $args{name} is not a CODE reference");
}
my $self = bless \%args, $class;
$self->compile_type_constraint()
if !$args{hand_optimized_type_constraint};
if($args{type_constraints}) { # union types
foreach my $type(@{$self->{type_constraints}}){
if($type->has_coercion){
# set undef for has_coercion()
$self->{_compiled_type_coercion} = undef;
last;
}
}
}
return $self;
}
sub create_child_type {
my $self = shift;
return ref($self)->new(@_, parent => $self);
}
sub name;
sub parent;
sub message;
sub has_coercion;
sub check;
sub type_parameter;
sub __is_parameterized;
sub _compiled_type_constraint;
sub _compiled_type_coercion;
sub compile_type_constraint;
sub _add_type_coercions { # ($self, @pairs)
my $self = shift;
if(exists $self->{type_constraints}){ # union type
$self->throw_error(
"Cannot add additional type coercions to Union types '$self'");
}
my $coercion_map = ($self->{coercion_map} ||= []);
my %has = map{ $_->[0]->name => undef } @{$coercion_map};
for(my $i = 0; $i < @_; $i++){
my $from = $_[ $i];
my $action = $_[++$i];
if(exists $has{$from}){
$self->throw_error("A coercion action already exists for '$from'");
}
my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from)
or $self->throw_error(
"Could not find the type constraint ($from) to coerce from");
push @{$coercion_map}, [ $type => $action ];
}
$self->{_compiled_type_coercion} = undef;
return;
}
sub _compiled_type_coercion {
my($self) = @_;
my $coercion = $self->{_compiled_type_coercion};
return $coercion if defined $coercion;
if(!$self->{type_constraints}) {
my @coercions;
foreach my $pair(@{$self->{coercion_map}}) {
push @coercions,
[ $pair->[0]->_compiled_type_constraint, $pair->[1] ];
}
$coercion = sub {
my($thing) = @_;
foreach my $pair (@coercions) {
#my ($constraint, $converter) = @$pair;
if ($pair->[0]->($thing)) {
local $_ = $thing;
return $pair->[1]->($thing);
}
}
return $thing;
};
}
else { # for union type
my @coercions;
foreach my $type(@{$self->{type_constraints}}){
if($type->has_coercion){
push @coercions, $type;
}
}
if(@coercions){
$coercion = sub {
my($thing) = @_;
foreach my $type(@coercions){
my $value = $type->coerce($thing);
return $value if $self->check($value);
}
return $thing;
};
}
}
return( $self->{_compiled_type_coercion} = $coercion );
}
sub coerce {
my $self = shift;
return $_[0] if $self->check(@_);
my $coercion = $self->_compiled_type_coercion
or $self->throw_error("Cannot coerce without a type coercion");
return $coercion->(@_);
}
sub get_message {
my ($self, $value) = @_;
if ( my $msg = $self->message ) {
local $_ = $value;
return $msg->($value);
}
else {
if(not defined $value) {
$value = 'undef';
}
elsif( ref($value) && defined(&overload::StrVal) ) {
$value = overload::StrVal($value);
}
return "Validation failed for '$self' with value $value";
}
}
sub is_a_type_of {
my($self, $other) = @_;
# ->is_a_type_of('__ANON__') is always false
return 0 if !ref($other) && $other eq '__ANON__';
(my $other_name = $other) =~ s/\s+//g;
return 1 if $self->name eq $other_name;
if(exists $self->{type_constraints}){ # union
foreach my $type(@{$self->{type_constraints}}) {
return 1 if $type->name eq $other_name;
}
}
for(my $p = $self->parent; defined $p; $p = $p->parent) {
return 1 if $p->name eq $other_name;
}
return 0;
}
# See also Moose::Meta::TypeConstraint::Parameterizable
sub parameterize {
my($self, $param, $name) = @_;
if(!ref $param){
require Mouse::Util::TypeConstraints;
$param = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($param);
}
$name ||= sprintf '%s[%s]', $self->name, $param->name;
return Mouse::Meta::TypeConstraint->new(
name => $name,
parent => $self,
type_parameter => $param,
);
}
sub assert_valid {
my ($self, $value) = @_;
if(!$self->check($value)){
$self->throw_error($self->get_message($value));
}
return 1;
}
# overloading stuff
sub _as_string { $_[0]->name } # overload ""
sub _identity; # overload 0+
sub _unite { # overload infix:<|>
my($lhs, $rhs) = @_;
require Mouse::Util::TypeConstraints;
return Mouse::Util::TypeConstraints::_find_or_create_union_type(
$lhs,
Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($rhs),
);
}
1;
__END__
=head1 NAME
Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
=head1 VERSION
This document describes Mouse version 0.97
=head1 DESCRIPTION
This class represents a type constraint, including built-in
type constraints, union type constraints, parameterizable/
parameterized type constraints, as well as custom type
constraints
=head1 METHODS
=over
=item C<< Mouse::Meta::TypeConstraint->new(%options) >>
=item C<< $constraint->name >>
=item C<< $constraint->parent >>
=item C<< $constraint->constraint >>
=item C<< $constraint->has_coercion >>
=item C<< $constraint->message >>
=item C<< $constraint->is_a_type_of($name or $object) >>
=item C<< $constraint->coerce($value) >>
=item C<< $constraint->check($value) >>
=item C<< $constraint->assert_valid($value) >>
=item C<< $constraint->get_message($value) >>
=item C<< $constraint->create_child_type(%options) >>
=back
=head1 SEE ALSO
L<Moose::Meta::TypeConstraint>
=cut
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