1: <?php
 2: 
 3: /**
 4:  * This file is part of the Nette Framework (https://nette.org)
 5:  * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 6:  */
 7: 
 8: namespace Nette\DI\Config;
 9: 
10: use Nette;
11: 
12: 
13: /**
14:  * Configuration helpers.
15:  */
16: class Helpers
17: {
18:     use Nette\StaticClass;
19: 
20:     const
21:         EXTENDS_KEY = '_extends',
22:         OVERWRITE = true;
23: 
24: 
25:     /**
26:      * Merges configurations. Left has higher priority than right one.
27:      * @return array|string
28:      */
29:     public static function merge($left, $right)
30:     {
31:         if (is_array($left) && is_array($right)) {
32:             foreach ($left as $key => $val) {
33:                 if (is_int($key)) {
34:                     $right[] = $val;
35:                 } else {
36:                     if (is_array($val) && isset($val[self::EXTENDS_KEY])) {
37:                         if ($val[self::EXTENDS_KEY] === self::OVERWRITE) {
38:                             unset($val[self::EXTENDS_KEY]);
39:                         }
40:                     } elseif (isset($right[$key])) {
41:                         $val = static::merge($val, $right[$key]);
42:                     }
43:                     $right[$key] = $val;
44:                 }
45:             }
46:             return $right;
47: 
48:         } elseif ($left === null && is_array($right)) {
49:             return $right;
50: 
51:         } else {
52:             return $left;
53:         }
54:     }
55: 
56: 
57:     /**
58:      * Finds out and removes information about the parent.
59:      * @return mixed
60:      */
61:     public static function takeParent(&$data)
62:     {
63:         if (is_array($data) && isset($data[self::EXTENDS_KEY])) {
64:             $parent = $data[self::EXTENDS_KEY];
65:             unset($data[self::EXTENDS_KEY]);
66:             return $parent;
67:         }
68:     }
69: 
70: 
71:     /**
72:      * @return bool
73:      */
74:     public static function isOverwriting(&$data)
75:     {
76:         return is_array($data) && isset($data[self::EXTENDS_KEY]) && $data[self::EXTENDS_KEY] === self::OVERWRITE;
77:     }
78: 
79: 
80:     /**
81:      * @return bool
82:      */
83:     public static function isInheriting(&$data)
84:     {
85:         return is_array($data) && isset($data[self::EXTENDS_KEY]) && $data[self::EXTENDS_KEY] !== self::OVERWRITE;
86:     }
87: }
88: