1: <?php
 2: namespace Peridot\Leo\Matcher;
 3: 
 4: use Peridot\Leo\Matcher\Template\ArrayTemplate;
 5: use Peridot\Leo\Matcher\Template\TemplateInterface;
 6: 
 7: /**
 8:  * NullMatcher determines if an actual value is null.
 9:  *
10:  * @package Peridot\Leo\Matcher
11:  */
12: class NullMatcher extends AbstractMatcher
13: {
14:     public function __construct()
15:     {
16: 
17:     }
18: 
19:     /**
20:      * Match if the actual value is null.
21:      *
22:      * @param $actual
23:      * @return mixed
24:      */
25:     protected function doMatch($actual)
26:     {
27:         return is_null($actual);
28:     }
29: 
30:     /**
31:      * {@inheritdoc}
32:      *
33:      * @return TemplateInterface
34:      */
35:     public function getDefaultTemplate()
36:     {
37:         return new ArrayTemplate([
38:             'default' => 'Expected {{actual}} to be null',
39:             'negated' => 'Expected {{actual}} not to be null'
40:         ]);
41:     }
42: }
43: