1 package MooseX::Params::Validate;
7 use Devel::Caller 'caller_cv';
8 use Scalar::Util 'blessed', 'refaddr', 'reftype';
10 use Moose::Util::TypeConstraints qw( find_type_constraint class_type role_type );
11 use Params::Validate ();
12 use Sub::Exporter -setup => {
14 qw( validated_hash validated_list pos_validated_list validate validatep )
17 default => [qw( validated_hash validated_list pos_validated_list )],
18 deprecated => [qw( validate validatep )],
25 my ( $args, %spec ) = @_;
27 my $cache_key = _cache_key( \%spec );
29 my $allow_extra = delete $spec{MX_PARAMS_VALIDATE_ALLOW_EXTRA};
31 if ( exists $CACHED_SPECS{$cache_key} ) {
32 ( ref $CACHED_SPECS{$cache_key} eq 'HASH' )
34 "I was expecting a HASH-ref in the cached $cache_key parameter"
35 . " spec, you are doing something funky, stop it!";
36 %spec = %{ $CACHED_SPECS{$cache_key} };
39 my $should_cache = delete $spec{MX_PARAMS_VALIDATE_NO_CACHE} ? 0 : 1;
41 $spec{$_} = _convert_to_param_validate_spec( $spec{$_} )
44 $CACHED_SPECS{$cache_key} = \%spec
49 $instance = shift @$args if blessed $args->[0];
54 && reftype( $args->[0] ) eq 'HASH' ? %{ $args->[0] } : @$args;
56 $args{$_} = $spec{$_}{constraint}->coerce( $args{$_} )
57 for grep { $spec{$_}{coerce} && exists $args{$_} } keys %spec;
59 %args = Params::Validate::validate_with(
62 allow_extra => $allow_extra,
63 called => _caller_name(),
66 return ( ( defined $instance ? $instance : () ), %args );
69 *validate = \&validated_hash;
72 my ( $args, @spec ) = @_;
76 my $cache_key = _cache_key( \%spec );
78 my $allow_extra = delete $spec{MX_PARAMS_VALIDATE_ALLOW_EXTRA};
81 if ( exists $CACHED_SPECS{$cache_key} ) {
82 ( ref $CACHED_SPECS{$cache_key} eq 'ARRAY' )
84 "I was expecting a ARRAY-ref in the cached $cache_key parameter"
85 . " spec, you are doing something funky, stop it!";
86 %spec = %{ $CACHED_SPECS{$cache_key}->[0] };
87 @ordered_spec = @{ $CACHED_SPECS{$cache_key}->[1] };
90 my $should_cache = delete $spec{MX_PARAMS_VALIDATE_NO_CACHE} ? 0 : 1;
92 @ordered_spec = grep { exists $spec{$_} } @spec;
94 $spec{$_} = _convert_to_param_validate_spec( $spec{$_} )
97 $CACHED_SPECS{$cache_key} = [ \%spec, \@ordered_spec ]
102 $instance = shift @$args if blessed $args->[0];
107 && reftype( $args->[0] ) eq 'HASH' ? %{ $args->[0] } : @$args;
109 $args{$_} = $spec{$_}{constraint}->coerce( $args{$_} )
110 for grep { $spec{$_}{coerce} && exists $args{$_} } keys %spec;
112 %args = Params::Validate::validate_with(
115 allow_extra => $allow_extra,
116 called => _caller_name(),
120 ( defined $instance ? $instance : () ),
125 *validatep = \&validated_list;
127 sub pos_validated_list {
131 push @spec, shift while ref $_[0];
135 my $cache_key = _cache_key( \%extra );
137 my $allow_extra = delete $extra{MX_PARAMS_VALIDATE_ALLOW_EXTRA};
140 if ( exists $CACHED_SPECS{$cache_key} ) {
141 ( ref $CACHED_SPECS{$cache_key} eq 'ARRAY' )
143 "I was expecting an ARRAY-ref in the cached $cache_key parameter"
144 . " spec, you are doing something funky, stop it!";
145 @pv_spec = @{ $CACHED_SPECS{$cache_key} };
148 my $should_cache = exists $extra{MX_PARAMS_VALIDATE_NO_CACHE} ? 0 : 1;
150 # prepare the parameters ...
151 @pv_spec = map { _convert_to_param_validate_spec($_) } @spec;
153 $CACHED_SPECS{$cache_key} = \@pv_spec
160 && reftype( $args->[0] ) eq 'ARRAY' ? @{ $args->[0] } : @$args;
162 $args[$_] = $pv_spec[$_]{constraint}->coerce( $args[$_] )
163 for grep { $pv_spec[$_] && $pv_spec[$_]{coerce} } 0 .. $#args;
165 @args = Params::Validate::validate_with(
168 allow_extra => $allow_extra,
169 called => _caller_name(),
178 if ( exists $spec->{MX_PARAMS_VALIDATE_CACHE_KEY} ) {
179 return delete $spec->{MX_PARAMS_VALIDATE_CACHE_KEY};
182 return refaddr( caller_cv(2) );
186 sub _convert_to_param_validate_spec {
190 $pv_spec{optional} = $spec->{optional}
191 if exists $spec->{optional};
193 $pv_spec{default} = $spec->{default}
194 if exists $spec->{default};
196 $pv_spec{coerce} = $spec->{coerce}
197 if exists $spec->{coerce};
200 if ( defined $spec->{isa} ) {
202 = _is_tc( $spec->{isa} )
203 || Moose::Util::TypeConstraints::find_or_parse_type_constraint(
205 || class_type( $spec->{isa} );
207 elsif ( defined $spec->{does} ) {
209 = _is_tc( $spec->{isa} )
210 || find_type_constraint( $spec->{does} )
211 || role_type( $spec->{does} );
214 $pv_spec{callbacks} = $spec->{callbacks}
215 if exists $spec->{callbacks};
218 $pv_spec{constraint} = $constraint;
221 { 'checking type constraint for ' . $constraint->name }
222 = sub { $constraint->check( $_[0] ) };
225 delete $pv_spec{coerce}
226 unless $pv_spec{constraint} && $pv_spec{constraint}->has_coercion;
232 my $maybe_tc = shift;
237 && $maybe_tc->isa('Moose::Meta::TypeConstraint');
241 my $depth = shift || 0;
243 return ( caller( 2 + $depth ) )[3];
248 # ABSTRACT: an extension of Params::Validate using Moose's types
258 use MooseX::Params::Validate;
261 my ( $self, %params ) = validated_hash(
263 bar => { isa => 'Str', default => 'Moose' },
265 return "Hooray for $params{bar}!";
270 my ( $foo, $baz, $gorch ) = validated_list(
272 foo => { isa => 'Foo' },
273 baz => { isa => 'ArrayRef | HashRef', optional => 1 },
274 gorch => { isa => 'ArrayRef[Int]', optional => 1 }
276 [ $foo, $baz, $gorch ];
281 This module fills a gap in Moose by adding method parameter validation
282 to Moose. This is just one of many developing options, it should not
283 be considered the "official" one by any means though.
285 You might also want to explore C<MooseX::Method::Signatures> and
290 It is not possible to introspect the method parameter specs; they are
291 created as needed when the method is called and cached for subsequent
298 =item B<validated_hash( \@_, %parameter_spec )>
300 This behaves similarly to the standard Params::Validate C<validate>
301 function and returns the captured values in a HASH. The one exception
302 is where if it spots an instance in the C<@_>, then it will handle
303 it appropriately (unlike Params::Validate which forces you to shift
306 The values in C<@_> can either be a set of name-value pairs or a single hash
309 The C<%parameter_spec> accepts the following options:
315 The C<isa> option can be either; class name, Moose type constraint
316 name or an anon Moose type constraint.
320 The C<does> option can be either; role name or an anon Moose type
325 This is the default value to be used if the value is not supplied.
329 As with Params::Validate, all options are considered required unless
330 otherwise specified. This option is passed directly to
335 If this is true and the parameter has a type constraint which has
336 coercions, then the coercion will be called for this parameter. If the
337 type does have coercions, then this parameter is ignored.
341 This function is also available under its old name, C<validate>.
343 =item B<validated_list( \@_, %parameter_spec )>
345 The C<%parameter_spec> accepts the same options as above, but returns
346 the parameters as positional values instead of a HASH. This is best
347 explained by example:
350 my ( $self, $foo, $bar ) = validated_list(
352 foo => { isa => 'Foo' },
353 bar => { isa => 'Bar' },
358 We capture the order in which you defined the parameters and then
359 return them as a list in the same order. If a param is marked optional
360 and not included, then it will be set to C<undef>.
362 The values in C<@_> can either be a set of name-value pairs or a single hash
365 Like C<validated_hash>, if it spots an object instance as the first
366 parameter of C<@_>, it will handle it appropriately, returning it as
369 This function is also available under its old name, C<validatep>.
371 =item B<pos_validated_list( \@_, $spec, $spec, ... )>
373 This function validates a list of positional parameters. Each C<$spec>
374 should validate one of the parameters in the list:
378 my ( $foo, $bar ) = pos_validated_list(
387 Unlike the other functions, this function I<cannot> find C<$self> in
388 the argument list. Make sure to shift it off yourself before doing
391 The values in C<@_> can either be a list of values or a single array
394 If a parameter is marked as optional and is not present, it will
395 simply not be returned.
397 If you want to pass in any of the cache control parameters described
398 below, simply pass them after the list of parameter validation specs:
402 my ( $foo, $bar ) = pos_validated_list(
406 MX_PARAMS_VALIDATE_NO_CACHE => 1,
414 =head1 ALLOWING EXTRA PARAMETERS
416 By default, any parameters not mentioned in the parameter spec cause this
417 module to throw an error. However, you can have have this module simply ignore
418 them by setting C<MX_PARAMS_VALIDATE_ALLOW_EXTRA> to a true value when calling
419 a validation subroutine.
421 When calling C<validated_hash> or C<pos_validated_list> the extra parameters
422 are simply returned in the hash or list as appropriate. However, when you call
423 C<validated_list> the extra parameters will not be returned at all. You can
424 get them by looking at the original value of C<@_>.
428 By default, this module exports the C<validated_hash>,
429 C<validated_list>, and C<pos_validated_list>.
431 If you would prefer to import the now deprecated functions C<validate>
432 and C<validatep> instead, you can use the C<:deprecated> tag to import
435 =head1 IMPORTANT NOTE ON CACHING
437 When a validation subroutine is called the first time, the parameter spec is
438 prepared and cached to avoid unnecessary regeneration. It uses the fully
439 qualified name of the subroutine (package + subname) as the cache key. In
440 99.999% of the use cases for this module, that will be the right thing to do.
442 However, I have (ab)used this module occasionally to handle dynamic
443 sets of parameters. In this special use case you can do a couple
444 things to better control the caching behavior.
450 Passing in the C<MX_PARAMS_VALIDATE_NO_CACHE> flag in the parameter
451 spec this will prevent the parameter spec from being cached.
454 my ( $self, %params ) = validated_hash(
456 foo => { isa => 'Foo' },
457 MX_PARAMS_VALIDATE_NO_CACHE => 1,
464 Passing in C<MX_PARAMS_VALIDATE_CACHE_KEY> with a value to be used as
465 the cache key will bypass the normal cache key generation.
468 my ( $self, %params ) = validated_hash(
470 foo => { isa => 'Foo' },
471 MX_PARAMS_VALIDATE_CACHE_KEY => 'foo-42',
480 Dave Rolsky E<lt>autarch@urth.orgE<gt>
484 Please submit bugs to the CPAN RT system at
485 http://rt.cpan.org/NoAuth/ReportBug.html?Queue=moosex-params-validate or via
486 email at bug-moosex-params-validate@rt.cpan.org.