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