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3b46bd49 |
1 | package Mouse::Util::TypeConstraints; |
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2 | use strict; |
3 | use warnings; |
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4 | use base 'Exporter'; |
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5 | |
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6 | use Carp (); |
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7 | use Scalar::Util qw/blessed looks_like_number openhandle/; |
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8 | |
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9 | our @EXPORT = qw( |
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10 | as where message from via type subtype coerce class_type role_type enum |
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11 | ); |
12 | |
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13 | my %TYPE; |
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14 | my %TYPE_SOURCE; |
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15 | my %COERCE; |
16 | my %COERCE_KEYS; |
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17 | |
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18 | sub as ($) { |
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19 | as => $_[0] |
20 | } |
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21 | sub where (&) { |
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22 | where => $_[0] |
23 | } |
0f1dae9a |
24 | sub message (&) { |
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25 | message => $_[0] |
26 | } |
27 | |
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28 | sub from { @_ } |
29 | sub via (&) { |
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30 | $_[0] |
31 | } |
32 | |
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33 | my $optimized_constraints; |
34 | my $optimized_constraints_base; |
35 | { |
36 | no warnings 'uninitialized'; |
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37 | %TYPE = ( |
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38 | Any => sub { 1 }, |
39 | Item => sub { 1 }, |
40 | Bool => sub { |
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41 | !defined($_[0]) || $_[0] eq "" || "$_[0]" eq '1' || "$_[0]" eq '0' |
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42 | }, |
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43 | Undef => sub { !defined($_[0]) }, |
44 | Defined => sub { defined($_[0]) }, |
45 | Value => sub { defined($_[0]) && !ref($_[0]) }, |
46 | Num => sub { !ref($_[0]) && looks_like_number($_[0]) }, |
47 | Int => sub { defined($_[0]) && !ref($_[0]) && $_[0] =~ /^-?[0-9]+$/ }, |
48 | Str => sub { defined($_[0]) && !ref($_[0]) }, |
49 | ClassName => sub { Mouse::is_class_loaded($_[0]) }, |
50 | Ref => sub { ref($_[0]) }, |
51 | |
52 | ScalarRef => sub { ref($_[0]) eq 'SCALAR' }, |
53 | ArrayRef => sub { ref($_[0]) eq 'ARRAY' }, |
54 | HashRef => sub { ref($_[0]) eq 'HASH' }, |
55 | CodeRef => sub { ref($_[0]) eq 'CODE' }, |
56 | RegexpRef => sub { ref($_[0]) eq 'Regexp' }, |
57 | GlobRef => sub { ref($_[0]) eq 'GLOB' }, |
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58 | |
59 | FileHandle => sub { |
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60 | ref($_[0]) eq 'GLOB' && openhandle($_[0]) |
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61 | or |
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62 | blessed($_[0]) && $_[0]->isa("IO::Handle") |
abe4e887 |
63 | }, |
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64 | |
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65 | Object => sub { blessed($_[0]) && blessed($_[0]) ne 'Regexp' }, |
8a7f2a8a |
66 | ); |
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67 | |
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68 | sub optimized_constraints { \%TYPE } |
69 | my @TYPE_KEYS = keys %TYPE; |
70 | sub list_all_builtin_type_constraints { @TYPE_KEYS } |
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71 | |
72 | @TYPE_SOURCE{@TYPE_KEYS} = (__PACKAGE__) x @TYPE_KEYS; |
381f326a |
73 | } |
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74 | |
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75 | sub type { |
0d9fea22 |
76 | my $pkg = caller(0); |
77 | my($name, %conf) = @_; |
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78 | if ($TYPE{$name} && $TYPE_SOURCE{$name} ne $pkg) { |
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79 | Carp::croak "The type constraint '$name' has already been created in $TYPE_SOURCE{$name} and cannot be created again in $pkg"; |
0d9fea22 |
80 | }; |
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81 | my $constraint = $conf{where} || do { $TYPE{delete $conf{as} || 'Any' } }; |
82 | |
83 | $TYPE_SOURCE{$name} = $pkg; |
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84 | $TYPE{$name} = sub { local $_=$_[0]; $constraint->($_) }; |
0d9fea22 |
85 | } |
86 | |
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87 | sub subtype { |
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88 | my $pkg = caller(0); |
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89 | my($name, %conf) = @_; |
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90 | if ($TYPE{$name} && $TYPE_SOURCE{$name} ne $pkg) { |
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91 | Carp::croak "The type constraint '$name' has already been created in $TYPE_SOURCE{$name} and cannot be created again in $pkg"; |
61a02a3a |
92 | }; |
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93 | my $constraint = $conf{where} || do { |
94 | my $as = delete $conf{as} || 'Any'; |
95 | if (! exists $TYPE{$as}) { # Perhaps it's a parameterized source? |
96 | Mouse::Meta::Attribute::_build_type_constraint($as); |
97 | } |
98 | $TYPE{$as}; |
99 | }; |
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100 | my $as = $conf{as} || ''; |
101 | |
102 | $TYPE_SOURCE{$name} = $pkg; |
103 | |
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104 | if ($as = $TYPE{$as}) { |
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105 | $TYPE{$name} = sub { local $_=$_[0]; $as->($_) && $constraint->($_) }; |
1fbefea5 |
106 | } else { |
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107 | $TYPE{$name} = sub { local $_=$_[0]; $constraint->($_) }; |
1fbefea5 |
108 | } |
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109 | } |
110 | |
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111 | sub coerce { |
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112 | my($name, %conf) = @_; |
113 | |
114 | Carp::croak "Cannot find type '$name', perhaps you forgot to load it." |
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115 | unless $TYPE{$name}; |
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116 | |
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117 | unless ($COERCE{$name}) { |
118 | $COERCE{$name} = {}; |
119 | $COERCE_KEYS{$name} = []; |
120 | } |
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121 | while (my($type, $code) = each %conf) { |
122 | Carp::croak "A coercion action already exists for '$type'" |
8a7f2a8a |
123 | if $COERCE{$name}->{$type}; |
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124 | |
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125 | if (! $TYPE{$type}) { |
126 | # looks parameterized |
127 | if ($type =~ /^[^\[]+\[.+\]$/) { |
128 | Mouse::Meta::Attribute::_build_type_constraint($type); |
129 | } else { |
130 | Carp::croak "Could not find the type constraint ($type) to coerce from" |
131 | } |
132 | } |
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133 | |
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134 | push @{ $COERCE_KEYS{$name} }, $type; |
135 | $COERCE{$name}->{$type} = $code; |
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136 | } |
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137 | } |
138 | |
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139 | sub class_type { |
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140 | my $pkg = caller(0); |
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141 | my($name, $conf) = @_; |
142 | my $class = $conf->{class}; |
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143 | subtype( |
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144 | $name => where => sub { $_->isa($class) } |
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145 | ); |
ecc6e3b1 |
146 | } |
147 | |
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148 | sub role_type { |
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149 | my($name, $conf) = @_; |
150 | my $role = $conf->{role}; |
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151 | subtype( |
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152 | $name => where => sub { |
153 | return unless defined $_ && ref($_) && $_->isa('Mouse::Object'); |
154 | $_->meta->does_role($role); |
155 | } |
156 | ); |
47f36c05 |
157 | } |
158 | |
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159 | sub typecast_constraints { |
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160 | my($class, $pkg, $type_constraint, $types, $value) = @_; |
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161 | |
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162 | local $_; |
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163 | for my $type (ref($types) eq 'ARRAY' ? @{ $types } : ( $types )) { |
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164 | next unless $COERCE{$type}; |
8a7f2a8a |
165 | for my $coerce_type (@{ $COERCE_KEYS{$type}}) { |
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166 | $_ = $value; |
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167 | next unless $TYPE{$coerce_type}->($value); |
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168 | $_ = $value; |
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169 | $_ = $COERCE{$type}->{$coerce_type}->($value); |
170 | return $_ if $type_constraint->($_); |
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171 | } |
172 | } |
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173 | return $value; |
174 | } |
175 | |
01904723 |
176 | my $serial_enum = 0; |
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177 | sub enum { |
01904723 |
178 | # enum ['small', 'medium', 'large'] |
179 | if (ref($_[0]) eq 'ARRAY') { |
180 | my @elements = @{ shift @_ }; |
181 | |
182 | my $name = 'Mouse::Util::TypeConstaints::Enum::Serial::' |
183 | . ++$serial_enum; |
184 | enum($name, @elements); |
185 | return $name; |
186 | } |
187 | |
188 | # enum size => 'small', 'medium', 'large' |
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189 | my $name = shift; |
190 | my %is_valid = map { $_ => 1 } @_; |
191 | |
192 | subtype( |
193 | $name => where => sub { $is_valid{$_} } |
194 | ); |
195 | } |
196 | |
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197 | 1; |
198 | |
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199 | __END__ |
200 | |
201 | =head1 NAME |
202 | |
3b46bd49 |
203 | Mouse::Util::TypeConstraints - simple type constraints |
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204 | |
205 | =head1 METHODS |
206 | |
207 | =head2 optimized_constraints -> HashRef[CODE] |
208 | |
209 | Returns the simple type constraints that Mouse understands. |
210 | |
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211 | =head1 FUNCTIONS |
212 | |
213 | =over 4 |
214 | |
215 | =item B<subtype 'Name' => as 'Parent' => where { } ...> |
216 | |
217 | =item B<subtype as 'Parent' => where { } ...> |
218 | |
219 | =item B<class_type ($class, ?$options)> |
220 | |
221 | =item B<role_type ($role, ?$options)> |
222 | |
223 | =item B<enum (\@values)> |
224 | |
225 | =back |
226 | |
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227 | =cut |
228 | |
229 | |