Commit | Line | Data |
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1 | |
2 | package Moose::Util::TypeConstraints; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
e90c03d0 |
7 | use Carp 'confess'; |
a15dff8d |
8 | use Scalar::Util 'blessed'; |
9 | |
5204cd52 |
10 | our $VERSION = '0.05'; |
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11 | |
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12 | use Moose::Meta::TypeConstraint; |
2ca63f5d |
13 | use Moose::Meta::TypeCoercion; |
4e036ee4 |
14 | |
a3c7e2fe |
15 | { |
16 | require Sub::Exporter; |
17 | |
18 | my @exports = qw[type subtype as where message coerce from via find_type_constraint]; |
19 | |
20 | Sub::Exporter->import( |
21 | -setup => { |
22 | exports => \@exports, |
23 | groups => { |
24 | default => [':all'] |
25 | } |
26 | } |
27 | ); |
a15dff8d |
28 | } |
29 | |
182134e8 |
30 | { |
31 | my %TYPES; |
446e850f |
32 | sub find_type_constraint { |
33 | return $TYPES{$_[0]}->[1] |
34 | if exists $TYPES{$_[0]}; |
35 | return; |
36 | } |
37 | |
38 | sub _dump_type_constraints { |
39 | require Data::Dumper; |
256903b6 |
40 | Data::Dumper::Dumper(\%TYPES); |
446e850f |
41 | } |
42 | |
7c13858b |
43 | sub _create_type_constraint { |
76d37e5a |
44 | my ($name, $parent, $check, $message) = @_; |
0e6614c3 |
45 | my $pkg_defined_in = scalar(caller(1)); |
46 | ($TYPES{$name}->[0] eq $pkg_defined_in) |
446e850f |
47 | || confess "The type constraint '$name' has already been created " |
0e6614c3 |
48 | if defined $name && exists $TYPES{$name}; |
49 | $parent = find_type_constraint($parent) if defined $parent; |
a27aa600 |
50 | my $constraint = Moose::Meta::TypeConstraint->new( |
51 | name => $name || '__ANON__', |
66811d63 |
52 | parent => $parent, |
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53 | constraint => $check, |
54 | message => $message, |
4e036ee4 |
55 | ); |
0e6614c3 |
56 | $TYPES{$name} = [ $pkg_defined_in, $constraint ] if defined $name; |
a27aa600 |
57 | return $constraint; |
182134e8 |
58 | } |
182134e8 |
59 | |
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60 | sub _install_type_coercions { |
a27aa600 |
61 | my ($type_name, $coercion_map) = @_; |
0e6614c3 |
62 | my $type = find_type_constraint($type_name); |
4e036ee4 |
63 | (!$type->has_coercion) |
d46a48f3 |
64 | || confess "The type coercion for '$type_name' has already been registered"; |
a27aa600 |
65 | my $type_coercion = Moose::Meta::TypeCoercion->new( |
66 | type_coercion_map => $coercion_map, |
67 | type_constraint => $type |
68 | ); |
69 | $type->coercion($type_coercion); |
182134e8 |
70 | } |
66811d63 |
71 | |
c07af9d2 |
72 | sub create_type_constraint_union { |
73 | my (@type_constraint_names) = @_; |
74 | return Moose::Meta::TypeConstraint->union( |
75 | map { |
76 | find_type_constraint($_) |
77 | } @type_constraint_names |
78 | ); |
79 | } |
80 | |
66811d63 |
81 | sub export_type_contstraints_as_functions { |
82 | my $pkg = caller(); |
83 | no strict 'refs'; |
84 | foreach my $constraint (keys %TYPES) { |
0e6614c3 |
85 | *{"${pkg}::${constraint}"} = find_type_constraint($constraint)->_compiled_type_constraint; |
66811d63 |
86 | } |
87 | } |
182134e8 |
88 | } |
a15dff8d |
89 | |
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90 | # type constructors |
a15dff8d |
91 | |
92 | sub type ($$) { |
93 | my ($name, $check) = @_; |
7c13858b |
94 | _create_type_constraint($name, undef, $check); |
a15dff8d |
95 | } |
96 | |
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97 | sub subtype ($$;$$) { |
98 | unshift @_ => undef if scalar @_ <= 2; |
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99 | _create_type_constraint(@_); |
a15dff8d |
100 | } |
101 | |
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102 | sub coerce ($@) { |
66811d63 |
103 | my ($type_name, @coercion_map) = @_; |
7c13858b |
104 | _install_type_coercions($type_name, \@coercion_map); |
182134e8 |
105 | } |
106 | |
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107 | sub as ($) { $_[0] } |
108 | sub from ($) { $_[0] } |
109 | sub where (&) { $_[0] } |
110 | sub via (&) { $_[0] } |
111 | sub message (&) { $_[0] } |
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112 | |
113 | # define some basic types |
114 | |
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115 | type 'Any' => where { 1 }; # meta-type including all |
116 | type 'Item' => where { 1 }; # base-type |
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117 | |
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118 | subtype 'Undef' => as 'Item' => where { !defined($_) }; |
119 | subtype 'Defined' => as 'Item' => where { defined($_) }; |
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120 | |
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121 | subtype 'Bool' => as 'Item' => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' }; |
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122 | |
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123 | subtype 'Value' => as 'Defined' => where { !ref($_) }; |
124 | subtype 'Ref' => as 'Defined' => where { ref($_) }; |
125 | |
126 | subtype 'Str' => as 'Value' => where { 1 }; |
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127 | |
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128 | subtype 'Num' => as 'Value' => where { Scalar::Util::looks_like_number($_) }; |
d4634ca2 |
129 | subtype 'Int' => as 'Num' => where { "$_" =~ /^-?[0-9]+$/ }; |
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130 | |
131 | subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' }; |
451c8248 |
132 | subtype 'ArrayRef' => as 'Ref' => where { ref($_) eq 'ARRAY' }; |
133 | subtype 'HashRef' => as 'Ref' => where { ref($_) eq 'HASH' }; |
e9ec68d6 |
134 | subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' }; |
135 | subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' }; |
a15dff8d |
136 | |
137 | # NOTE: |
138 | # blessed(qr/.../) returns true,.. how odd |
e9ec68d6 |
139 | subtype 'Object' => as 'Ref' => where { blessed($_) && blessed($_) ne 'Regexp' }; |
a15dff8d |
140 | |
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141 | subtype 'Role' => as 'Object' => where { $_->can('does') }; |
142 | |
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143 | 1; |
144 | |
145 | __END__ |
146 | |
147 | =pod |
148 | |
149 | =head1 NAME |
150 | |
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151 | Moose::Util::TypeConstraints - Type constraint system for Moose |
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152 | |
153 | =head1 SYNOPSIS |
154 | |
155 | use Moose::Util::TypeConstraints; |
156 | |
157 | type Num => where { Scalar::Util::looks_like_number($_) }; |
158 | |
159 | subtype Natural |
160 | => as Num |
161 | => where { $_ > 0 }; |
162 | |
163 | subtype NaturalLessThanTen |
164 | => as Natural |
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165 | => where { $_ < 10 } |
166 | => message { "This number ($_) is not less than ten!" }; |
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167 | |
168 | coerce Num |
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169 | => from Str |
170 | => via { 0+$_ }; |
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171 | |
172 | =head1 DESCRIPTION |
173 | |
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174 | This module provides Moose with the ability to create type contraints |
175 | to be are used in both attribute definitions and for method argument |
176 | validation. |
177 | |
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178 | =head2 Important Caveat |
179 | |
180 | This is B<NOT> a type system for Perl 5. These are type constraints, |
181 | and they are not used by Moose unless you tell it to. No type |
182 | inference is performed, expression are not typed, etc. etc. etc. |
183 | |
184 | This is simply a means of creating small constraint functions which |
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185 | can be used to simplify your own type-checking code. |
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186 | |
187 | =head2 Default Type Constraints |
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188 | |
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189 | This module also provides a simple hierarchy for Perl 5 types, this |
190 | could probably use some work, but it works for me at the moment. |
191 | |
192 | Any |
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193 | Item |
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194 | Bool |
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195 | Undef |
196 | Defined |
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197 | Value |
198 | Num |
199 | Int |
200 | Str |
201 | Ref |
202 | ScalarRef |
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203 | ArrayRef |
204 | HashRef |
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205 | CodeRef |
206 | RegexpRef |
207 | Object |
208 | Role |
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209 | |
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210 | Suggestions for improvement are welcome. |
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211 | |
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212 | =head1 FUNCTIONS |
213 | |
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214 | =head2 Type Constraint Registry |
215 | |
216 | =over 4 |
217 | |
218 | =item B<find_type_constraint ($type_name)> |
219 | |
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220 | This function can be used to locate a specific type constraint |
221 | meta-object. What you do with it from there is up to you :) |
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222 | |
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223 | =item B<create_type_constraint_union (@type_constraint_names)> |
224 | |
225 | Given a list of C<@type_constraint_names>, this will return a |
226 | B<Moose::Meta::TypeConstraint::Union> instance. |
227 | |
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228 | =item B<export_type_contstraints_as_functions> |
229 | |
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230 | This will export all the current type constraints as functions |
231 | into the caller's namespace. Right now, this is mostly used for |
232 | testing, but it might prove useful to others. |
233 | |
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234 | =back |
235 | |
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236 | =head2 Type Constraint Constructors |
237 | |
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238 | The following functions are used to create type constraints. |
239 | They will then register the type constraints in a global store |
240 | where Moose can get to them if it needs to. |
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241 | |
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242 | See the L<SYNOPOSIS> for an example of how to use these. |
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243 | |
6ba6d68c |
244 | =over 4 |
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245 | |
6ba6d68c |
246 | =item B<type ($name, $where_clause)> |
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247 | |
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248 | This creates a base type, which has no parent. |
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249 | |
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250 | =item B<subtype ($name, $parent, $where_clause, ?$message)> |
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251 | |
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252 | This creates a named subtype. |
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253 | |
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254 | =item B<subtype ($parent, $where_clause, ?$message)> |
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255 | |
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256 | This creates an unnamed subtype and will return the type |
257 | constraint meta-object, which will be an instance of |
258 | L<Moose::Meta::TypeConstraint>. |
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259 | |
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260 | =item B<as> |
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261 | |
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262 | This is just sugar for the type constraint construction syntax. |
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263 | |
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264 | =item B<where> |
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265 | |
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266 | This is just sugar for the type constraint construction syntax. |
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267 | |
268 | =item B<message> |
269 | |
270 | This is just sugar for the type constraint construction syntax. |
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271 | |
6ba6d68c |
272 | =back |
a15dff8d |
273 | |
6ba6d68c |
274 | =head2 Type Coercion Constructors |
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275 | |
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276 | Type constraints can also contain type coercions as well. In most |
277 | cases Moose will run the type-coercion code first, followed by the |
278 | type constraint check. This feature should be used carefully as it |
279 | is very powerful and could easily take off a limb if you are not |
280 | careful. |
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281 | |
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282 | See the L<SYNOPOSIS> for an example of how to use these. |
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283 | |
6ba6d68c |
284 | =over 4 |
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285 | |
6ba6d68c |
286 | =item B<coerce> |
a15dff8d |
287 | |
6ba6d68c |
288 | =item B<from> |
a15dff8d |
289 | |
6ba6d68c |
290 | This is just sugar for the type coercion construction syntax. |
291 | |
292 | =item B<via> |
a15dff8d |
293 | |
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294 | This is just sugar for the type coercion construction syntax. |
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295 | |
296 | =back |
297 | |
298 | =head1 BUGS |
299 | |
300 | All complex software has bugs lurking in it, and this module is no |
301 | exception. If you find a bug please either email me, or add the bug |
302 | to cpan-RT. |
303 | |
a15dff8d |
304 | =head1 AUTHOR |
305 | |
306 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
307 | |
308 | =head1 COPYRIGHT AND LICENSE |
309 | |
310 | Copyright 2006 by Infinity Interactive, Inc. |
311 | |
312 | L<http://www.iinteractive.com> |
313 | |
314 | This library is free software; you can redistribute it and/or modify |
315 | it under the same terms as Perl itself. |
316 | |
81dc201f |
317 | =cut |