Autoloader.php — Admin Columns 4.0.1

codepress-admin-columns / classes / Autoloader.php

codepress-admin-columns / classes Last commit date

Autoloader.php

150 lines

1	<?php
2
3	namespace AC;
4
5	use DirectoryIterator;
6	use FilesystemIterator;
7
8	class Autoloader {
9
10	/**
11	* @var self;
12	*/
13	protected static $instance;
14
15	/**
16	* Register prefixes and their path
17	* @var string[]
18	*/
19	protected $prefixes;
20
21	protected function __construct() {
22	$this->prefixes = array();
23
24	spl_autoload_register( array( $this, 'autoload' ) );
25	}
26
27	public static function instance() {
28	if ( null === self::$instance ) {
29	self::$instance = new self();
30	}
31
32	return self::$instance;
33	}
34
35	/**
36	* Register a prefix that should autoload
37	*
38	* @param $prefix string Unique prefix to this set of classes
39	* @param $dir string Path to directory where classes are stored
40	*
41	* @return $this
42	*/
43	public function register_prefix( $prefix, $dir ) {
44	$this->prefixes[ $prefix ] = trailingslashit( $dir );
45
46	// make sure that more specific prefixes are checked first
47	krsort( $this->prefixes );
48
49	return $this;
50	}
51
52	/**
53	* @param $class
54	*
55	* @return false\|string
56	*/
57	protected function get_prefix( $class ) {
58	foreach ( array_keys( $this->prefixes ) as $prefix ) {
59	if ( 0 === strpos( $class, $prefix ) ) {
60	return $prefix;
61	}
62	}
63
64	return false;
65	}
66
67	/**
68	* @param $prefix
69	*
70	* @return false\|string
71	*/
72	protected function get_path( $prefix ) {
73	if ( ! isset( $this->prefixes[ $prefix ] ) ) {
74	return false;
75	}
76
77	return $this->prefixes[ $prefix ];
78	}
79
80	/**
81	* Get the path from a given namespace that has a registered prefix
82	*
83	* @param string $namespace
84	*
85	* @return false\|string
86	*/
87	protected function get_path_from_namespace( $namespace ) {
88	$prefix = $this->get_prefix( $namespace );
89
90	if ( ! $prefix ) {
91	return false;
92	}
93
94	$path = $this->get_path( $prefix ) . substr( $namespace, strlen( $prefix ) );
95	$path = str_replace( '\\', '/', $path );
96
97	return $path;
98	}
99
100	/**
101	* @param string $class
102	*
103	* @return bool
104	*/
105	public function autoload( $class ) {
106	$path = $this->get_path_from_namespace( $class );
107	$file = realpath( $path . '.php' );
108
109	if ( ! $file ) {
110	return false;
111	}
112
113	require_once $file;
114
115	return true;
116	}
117
118	/**
119	* Get list of all auto-loadable class names from a directory
120	*
121	* @param $namespace
122	*
123	* @return array
124	*/
125	public function get_class_names_from_dir( $namespace ) {
126	$path = $this->get_path_from_namespace( $namespace );
127	$path = realpath( $path );
128
129	if ( ! $path ) {
130	return array();
131	}
132
133	$iterator = new FilesystemIterator( $path, FilesystemIterator::SKIP_DOTS );
134	$classes = array();
135
136	/* @var DirectoryIterator $leaf */
137	foreach ( $iterator as $leaf ) {
138	// Exclude system files
139	if ( 0 === strpos( $leaf->getBasename(), '.' ) ) {
140	continue;
141	}
142
143	if ( 'php' === $leaf->getExtension() ) {
144	$classes[] = $namespace . '\\' . pathinfo( $leaf->getBasename(), PATHINFO_FILENAME );
145	}
146	}
147
148	return $classes;
149	}
150	}