2 package Moose::Meta::Attribute::Native::Trait::Array;
5 our $VERSION = '1.9900';
6 $VERSION = eval $VERSION;
7 our $AUTHORITY = 'cpan:STEVAN';
9 with 'Moose::Meta::Attribute::Native::Trait';
11 sub _helper_type { 'ArrayRef' }
23 Moose::Meta::Attribute::Native::Trait::Array - Helper trait for array delegation
33 isa => 'ArrayRef[Str]',
34 default => sub { [] },
36 all_options => 'elements',
39 filter_options => 'grep',
40 find_option => 'first',
42 join_options => 'join',
43 count_options => 'count',
44 has_options => 'count',
45 has_no_options => 'is_empty',
46 sorted_options => 'sort',
55 This trait provides native delegation methods for array references.
59 If you don't provide an C<isa> value for your attribute, it will default to
62 =head1 PROVIDED METHODS
68 Returns the number of elements in the array.
71 $stuff->options( [ "foo", "bar", "baz", "boo" ] );
73 print $stuff->count_options; # prints 4
75 This method does not accept any arguments.
79 Returns a boolean value that is true when the array has no elements.
81 $stuff->has_no_options ? die "No options!\n" : print "Good boy.\n";
83 This method does not accept any arguments.
87 Returns all of the elements of the array as an array (not an array reference).
89 my @option = $stuff->all_options;
90 print "@options\n"; # prints "foo bar baz boo"
92 This method does not accept any arguments.
94 =item * B<get($index)>
96 Returns an element of the array by its index. You can also use negative index
97 numbers, just as with Perl's core array handling.
99 my $option = $stuff->get_option(1);
100 print "$option\n"; # prints "bar"
102 If the specified element does not exist, this will return C<undef>.
104 This method does accepts just one argument.
108 Just like Perl's builtin C<pop>.
110 This method does not accept any arguments.
112 =item * B<push($value1, $value2, value3 ...)>
114 Just like Perl's builtin C<push>. Returns the number of elements in the new
117 This method accepts any number of arguments.
121 Just like Perl's builtin C<shift>.
123 This method does not accept any arguments.
125 =item * B<unshift($value1, $value2, value3 ...)>
127 Just like Perl's builtin C<unshift>. Returns the number of elements in the new
130 This method accepts any number of arguments.
132 =item * B<splice($offset, $length, @values)>
134 Just like Perl's builtin C<splice>. In scalar context, this returns the last
135 element removed, or C<undef> if no elements were removed. In list context,
136 this returns all the elements removed from the array.
138 This method requires at least one argument.
140 =item * B<first( sub { ... } )>
142 This method returns the first item matching item in the array, just like
143 L<List::Util>'s C<first> function. The matching is done with a subroutine
144 reference you pass to this method. The subroutine will be called against each
145 element in the array until one matches or all elements have been checked.
147 my $found = $stuff->find_option( sub {/^b/} );
148 print "$found\n"; # prints "bar"
150 This method requires a single argument.
152 =item * B<grep( sub { ... } )>
154 This method returns every element matching a given criteria, just like Perl's
155 core C<grep> function. This method requires a subroutine which implements the
158 my @found = $stuff->filter_options( sub {/^b/} );
159 print "@found\n"; # prints "bar baz boo"
161 This method requires a single argument.
163 =item * B<grep_in_place( sub { ... } )>
165 This method greps through the array I<in place>, modifying the attributes value.
166 This method accepts a subroutine which implements the matching logic.
168 This method does not define a return value.
171 =item * B<map( sub { ... } )>
173 This method transforms every element in the array and returns a new array,
174 just like Perl's core C<map> function. This method requires a subroutine which
175 implements the transformation.
177 my @mod_options = $stuff->map_options( sub { $_ . "-tag" } );
178 print "@mod_options\n"; # prints "foo-tag bar-tag baz-tag boo-tag"
180 This method requires a single argument.
182 =item * B<reduce( sub { ... } )>
184 This method turns an array into a single value, by passing a function the
185 value so far and the next value in the array, just like L<List::Util>'s
186 C<reduce> function. The reducing is done with a subroutine reference you pass
189 my $found = $stuff->reduce_options( sub { $_[0] . $_[1] } );
190 print "$found\n"; # prints "foobarbazboo"
192 This method requires a single argument.
196 =item * B<sort( sub { ... } )>
198 Returns the elements of the array in sorted order.
200 You can provide an optional subroutine reference to sort with (as you can with
201 Perl's core C<sort> function). However, instead of using C<$a> and C<$b> in
202 this subroutine, you will need to use C<$_[0]> and C<$_[1]>.
204 # ascending ASCIIbetical
205 my @sorted = $stuff->sort_options();
207 # Descending alphabetical order
208 my @sorted_options = $stuff->sort_options( sub { lc $_[1] cmp lc $_[0] } );
209 print "@sorted_options\n"; # prints "foo boo baz bar"
211 This method accepts a single argument.
213 =item * B<sort_in_place>
215 =item * B<sort_in_place( sub { ... } )>
217 Sorts the array I<in place>, modifying the value of the attribute.
219 You can provide an optional subroutine reference to sort with (as you can with
220 Perl's core C<sort> function). However, instead of using C<$a> and C<$b>, you
221 will need to use C<$_[0]> and C<$_[1]> instead.
223 This method does not define a return value.
225 This method accepts a single argument.
229 Returns the elements of the array in random order, like C<shuffle> from
232 This method does not accept any arguments.
236 Returns the array with all duplicate elements removed, like C<uniq> from
239 This method does not accept any arguments.
241 =item * B<join($str)>
243 Joins every element of the array using the separator given as argument, just
244 like Perl's core C<join> function.
246 my $joined = $stuff->join_options(':');
247 print "$joined\n"; # prints "foo:bar:baz:boo"
249 This method requires a single argument.
251 =item * B<set($index, $value)>
253 Given an index and a value, sets the specified array element's value.
255 This method returns the value at C<$index> after the set.
257 This method requires two arguments.
259 =item * B<delete($index)>
261 Removes the element at the given index from the array.
263 This method returns the deleted value. Note that if no value exists, it will
266 This method requires one argument.
268 =item * B<insert($index, $value)>
270 Inserts a new element into the array at the given index.
272 This method returns the new value at C<$index>.
274 This method requires two arguments.
278 Empties the entire array, like C<@array = ()>.
280 This method does not define a return value.
282 This method does not accept any arguments.
284 =item * B<accessor($index)>
286 =item * B<accessor($index, $value)>
288 This method provides a get/set accessor for the array, based on array indexes.
289 If passed one argument, it returns the value at the specified index. If
290 passed two arguments, it sets the value of the specified index.
292 When called as a setter, this method returns the new value at C<$index>.
294 This method accepts one or two arguments.
296 =item * B<natatime($n)>
298 =item * B<natatime($n, $code)>
300 This method returns an iterator which, on each call, returns C<$n> more items
301 from the array, in order, like C<natatime> from L<List::MoreUtils>. A coderef
302 can optionally be provided; it will be called on each group of C<$n> elements
305 This method accepts one or two arguments.
311 See L<Moose/BUGS> for details on reporting bugs.
315 Stevan Little E<lt>stevan@iinteractive.comE<gt>
317 =head1 COPYRIGHT AND LICENSE
319 Copyright 2007-2010 by Infinity Interactive, Inc.
321 L<http://www.iinteractive.com>
323 This library is free software; you can redistribute it and/or modify
324 it under the same terms as Perl itself.