add contains method to MethodProvider/List

diff --git a/lib/MooseX/AttributeHelpers/MethodProvider/List.pm b/lib/MooseX/AttributeHelpers/MethodProvider/List.pm
index 95648cc..154d39b 100644 (file)
--- a/lib/MooseX/AttributeHelpers/MethodProvider/List.pm
+++ b/lib/MooseX/AttributeHelpers/MethodProvider/List.pm
@@ -54,6 +54,17 @@ sub elements : method {
     };
 }
 
+sub contains : method {
+    my ($attr, $reader, $writer) = @_;
+    return sub {
+        my ($instance, $item) = @_;
+        return scalar (defined $item ?
+            CORE::grep {defined && $_ eq $item} @{$reader->($instance)}
+            : CORE::grep {!defined} @{$reader->($instance)}
+        );
+    };
+}
+
 sub join : method {
     my ($attr, $reader, $writer) = @_;
     return sub {
@@ -106,15 +117,16 @@ MooseX::AttributeHelpers::MethodProvider::List
       default    => sub { [] },
       auto_deref => 1,
       provides   => {
-         map   => 'map_options',
-         grep  => 'filter_options',
-         find  => 'find_option',
-         first => 'first_option',
-         last  => 'last_option',
-         get   => 'get_option',
-         join  => 'join_options',
-         count => 'count_options',
-         empty => 'do_i_have_options',
+         map      => 'map_options',
+         grep     => 'filter_options',
+         find     => 'find_option',
+         first    => 'first_option',
+         last     => 'last_option',
+         get      => 'get_option',
+         join     =>  'join_options',
+         count    => 'count_options',
+         empty    => 'do_i_have_options',
+         contains => 'options_contains',
 
       }
    );
@@ -180,6 +192,16 @@ Returns an element of the list by its index.
    my $option = $stuff->get_option(1);
    print "$option\n"; # prints "bar"
 
+=item B<contains>
+Returns a true value if the list contains the passed value, otherwise returns
+a false value. The return value is actually the number of times the passed
+value appears in the list (0, or more).
+
+   my $found = $stuff->contains( 'apple' );
+   print "Found apple in the list\n" if $found;
+
+Note that this works even when looking for the undefined value.
+
 =item B<join>
 Joins every element of the list using the separator given as argument.
 

diff --git a/t/005_basic_list.t b/t/005_basic_list.t
index d4a49b7..f8a16c9 100644 (file)
--- a/t/005_basic_list.t
+++ b/t/005_basic_list.t
@@ -7,7 +7,7 @@ use Test::More;
 use Test::Exception;
 
 BEGIN {
-    plan tests => 29;
+    plan tests => 36;
 }
 
 BEGIN {
@@ -35,6 +35,7 @@ BEGIN {
             'get'      => 'get_option_at',
             'first'    => 'get_first_option',
             'last'     => 'get_last_option',
+            'contains' => 'options_contains',
         },
         curries   => {
             'grep'     => {less_than_five => [ sub { $_ < 5 } ]},
@@ -72,6 +73,7 @@ can_ok($stuff, $_) for qw[
     options
     join_options
     get_option_at
+    options_contains
 ];
 
 is_deeply($stuff->_options, [1 .. 10], '... got options');
@@ -100,6 +102,16 @@ is_deeply([ $stuff->options ], [1 .. 10], '... got the list of options');
 
 is($stuff->join_options(':'), '1:2:3:4:5:6:7:8:9:10', '... joined the list of options by :');
 
+is($stuff->options_contains(),0,'... does not contain undef');
+is($stuff->options_contains(5),1,'... contains "5"');
+is($stuff->options_contains(11),0,'... does not contain "11"');
+push @{$stuff->_options}, undef;
+is($stuff->options_contains(undef),1,'... does contain undef');
+push @{$stuff->_options}, 5;
+is($stuff->options_contains(5),2,'... contains returns count');
+splice @{$stuff->_options}, -2;
+is_deeply($stuff->_options, [1 .. 10], '... reset list for regression');
+
 # test the currying
 is_deeply([ $stuff->less_than_five() ], [1 .. 4]);
 
@@ -131,7 +143,8 @@ is_deeply($options->provides, {
     'join'     => 'join_options',
     'get'      => 'get_option_at',
     'first'    => 'get_first_option',
-    'last'     => 'get_last_option'
+    'last'     => 'get_last_option',
+    'contains' => 'options_contains',
 }, '... got the right provies mapping');
 
 is($options->type_constraint->type_parameter, 'Int', '... got the right container type');