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1 | package MooseX::AttributeHelpers::MethodProvider::List; |
2 | use Moose::Role; |
3 | |
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4 | our $VERSION = '0.14'; |
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5 | $VERSION = eval $VERSION; |
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6 | our $AUTHORITY = 'cpan:STEVAN'; |
7 | |
8 | sub count : method { |
9 | my ($attr, $reader, $writer) = @_; |
10 | return sub { |
11 | scalar @{$reader->($_[0])} |
12 | }; |
13 | } |
14 | |
15 | sub empty : method { |
16 | my ($attr, $reader, $writer) = @_; |
17 | return sub { |
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18 | scalar @{$reader->($_[0])} ? 1 : 0 |
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19 | }; |
20 | } |
21 | |
22 | sub find : method { |
23 | my ($attr, $reader, $writer) = @_; |
24 | return sub { |
25 | my ($instance, $predicate) = @_; |
26 | foreach my $val (@{$reader->($instance)}) { |
27 | return $val if $predicate->($val); |
28 | } |
29 | return; |
30 | }; |
31 | } |
32 | |
33 | sub map : method { |
34 | my ($attr, $reader, $writer) = @_; |
35 | return sub { |
36 | my ($instance, $f) = @_; |
37 | CORE::map { $f->($_) } @{$reader->($instance)} |
38 | }; |
39 | } |
40 | |
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41 | sub sort : method { |
42 | my ($attr, $reader, $writer) = @_; |
43 | return sub { |
44 | my ($instance, $predicate) = @_; |
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45 | die "Argument must be a code reference" |
46 | if $predicate && ref $predicate ne 'CODE'; |
47 | |
48 | if ($predicate) { |
49 | CORE::sort { $predicate->($a, $b) } @{$reader->($instance)}; |
50 | } |
51 | else { |
52 | CORE::sort @{$reader->($instance)}; |
53 | } |
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54 | }; |
55 | } |
56 | |
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57 | sub grep : method { |
58 | my ($attr, $reader, $writer) = @_; |
59 | return sub { |
60 | my ($instance, $predicate) = @_; |
61 | CORE::grep { $predicate->($_) } @{$reader->($instance)} |
62 | }; |
63 | } |
64 | |
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65 | sub elements : method { |
66 | my ($attr, $reader, $writer) = @_; |
67 | return sub { |
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68 | my ($instance) = @_; |
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69 | @{$reader->($instance)} |
70 | }; |
71 | } |
72 | |
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73 | sub join : method { |
74 | my ($attr, $reader, $writer) = @_; |
75 | return sub { |
76 | my ($instance, $separator) = @_; |
77 | join $separator, @{$reader->($instance)} |
78 | }; |
79 | } |
80 | |
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81 | sub get : method { |
82 | my ($attr, $reader, $writer) = @_; |
83 | return sub { |
84 | $reader->($_[0])->[$_[1]] |
85 | }; |
86 | } |
87 | |
88 | sub first : method { |
89 | my ($attr, $reader, $writer) = @_; |
90 | return sub { |
91 | $reader->($_[0])->[0] |
92 | }; |
93 | } |
94 | |
95 | sub last : method { |
96 | my ($attr, $reader, $writer) = @_; |
97 | return sub { |
98 | $reader->($_[0])->[-1] |
99 | }; |
100 | } |
101 | |
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102 | 1; |
103 | |
104 | __END__ |
105 | |
106 | =pod |
107 | |
108 | =head1 NAME |
109 | |
110 | MooseX::AttributeHelpers::MethodProvider::List |
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111 | |
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112 | =head1 SYNOPSIS |
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113 | |
114 | package Stuff; |
115 | use Moose; |
116 | use MooseX::AttributeHelpers; |
117 | |
118 | has 'options' => ( |
119 | metaclass => 'Collection::List', |
120 | is => 'rw', |
121 | isa => 'ArrayRef[Str]', |
122 | default => sub { [] }, |
123 | auto_deref => 1, |
124 | provides => { |
125 | map => 'map_options', |
126 | grep => 'filter_options', |
127 | find => 'find_option', |
128 | first => 'first_option', |
129 | last => 'last_option', |
130 | get => 'get_option', |
131 | join => 'join_options', |
132 | count => 'count_options', |
133 | empty => 'do_i_have_options', |
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134 | sort => 'sorted_options', |
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135 | |
136 | } |
137 | ); |
138 | |
139 | no Moose; |
140 | 1; |
141 | |
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142 | =head1 DESCRIPTION |
143 | |
144 | This is a role which provides the method generators for |
145 | L<MooseX::AttributeHelpers::Collection::List>. |
146 | |
147 | =head1 METHODS |
148 | |
149 | =over 4 |
150 | |
151 | =item B<meta> |
152 | |
153 | =back |
154 | |
155 | =head1 PROVIDED METHODS |
156 | |
157 | =over 4 |
158 | |
159 | =item B<count> |
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160 | Returns the number of elements of the list. |
161 | |
162 | $stuff = Stuff->new; |
163 | $stuff->options(["foo", "bar", "baz", "boo"]); |
164 | |
165 | my $count = $stuff->count_options; |
166 | print "$count\n"; # prints 4 |
167 | |
168 | =item B<empty> |
169 | If the list is populated, returns true. Otherwise, returns false. |
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170 | |
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171 | $stuff->do_i_have_options ? print "Good boy.\n" : die "No options!\n" ; |
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172 | |
173 | =item B<find> |
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174 | Returns the first element that returns true in the anonymous subroutine |
175 | passed as argument. |
176 | |
177 | my $found = $stuff->find_option( sub { $_[0] =~ /^b/ } ); |
178 | print "$found\n"; # prints "bar" |
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179 | |
180 | =item B<grep> |
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181 | Returns every element of the list that returns true in the anonymous |
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182 | subroutine passed as argument. |
183 | |
184 | my @found = $stuff->filter_options( sub { $_[0] =~ /^b/ } ); |
185 | print "@found\n"; # prints "bar baz boo" |
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186 | |
187 | =item B<map> |
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188 | Executes the anonymous subroutine given as argument sequentially |
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189 | for each element of the list. |
190 | |
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191 | my @mod_options = $stuff->map_options( sub { $_[0] . "-tag" } ); |
192 | print "@mod_options\n"; # prints "foo-tag bar-tag baz-tag boo-tag" |
193 | |
194 | =item B<sort> |
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195 | |
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196 | Returns a sorted list of the elements. You can optionally provide a |
197 | subroutine reference to sort with (as you can with the core C<sort> |
198 | function). However, instead of using C<$a> and C<$b>, you will need to |
199 | use C<$_[0]> and C<$_[1]> instead. |
200 | |
201 | # ascending ASCIIbetical |
202 | my @sorted = $stuff->sort_options(); |
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203 | |
204 | # Descending alphabetical order |
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205 | my @sorted_options = $stuff->sort_options( sub { lc $_[1] cmp lc $_[0] } ); |
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206 | print "@sorted_options\n"; # prints "foo boo baz bar" |
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207 | |
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208 | =item B<elements> |
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209 | Returns an element of the list by its index. |
210 | |
211 | my $option = $stuff->get_option(1); |
212 | print "$option\n"; # prints "bar" |
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213 | |
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214 | =item B<join> |
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215 | Joins every element of the list using the separator given as argument. |
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216 | |
217 | my $joined = $stuff->join_options( ':' ); |
218 | print "$joined\n"; # prints "foo:bar:baz:boo" |
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219 | |
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220 | =item B<get> |
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221 | Returns an element of the list by its index. |
222 | |
223 | my $option = $stuff->get_option(1); |
224 | print "$option\n"; # prints "bar" |
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225 | |
226 | =item B<first> |
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227 | Returns the first element. |
228 | |
229 | my $first = $stuff->first_option; |
230 | print "$first\n"; # prints "foo" |
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231 | |
232 | =item B<last> |
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233 | Returns the last item. |
234 | |
235 | my $last = $stuff->last_option; |
236 | print "$last\n"; # prints "boo" |
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237 | |
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238 | =back |
239 | |
240 | =head1 BUGS |
241 | |
242 | All complex software has bugs lurking in it, and this module is no |
243 | exception. If you find a bug please either email me, or add the bug |
244 | to cpan-RT. |
245 | |
246 | =head1 AUTHOR |
247 | |
248 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
249 | |
250 | =head1 COPYRIGHT AND LICENSE |
251 | |
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252 | Copyright 2007-2008 by Infinity Interactive, Inc. |
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253 | |
254 | L<http://www.iinteractive.com> |
255 | |
256 | This library is free software; you can redistribute it and/or modify |
257 | it under the same terms as Perl itself. |
258 | |
259 | =cut |