fluentform / app / Services / Spout / Autoloader / Psr4Autoloader.php

Psr4Autoloader.php in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder 6.2.5, at app/Services/Spout/Autoloader/Psr4Autoloader.php

151 lines 4.5 KB

Raw Download Zip

1	<?php
2
3	namespace Box\Spout\Autoloader;
4
5	/**
6	* Class Psr4Autoloader
7	* @see https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md#class-example
8	*
9	* @package Box\Spout\Autoloader
10	*/
11	class Psr4Autoloader
12	{
13	/**
14	* An associative array where the key is a namespace prefix and the value
15	* is an array of base directories for classes in that namespace.
16	*
17	* @var array
18	*/
19	protected $prefixes = array();
20
21	/**
22	* Register loader with SPL autoloader stack.
23	*
24	* @return void
25	*/
26	public function register()
27	{
28	spl_autoload_register(array($this, 'loadClass'));
29	}
30
31	/**
32	* Adds a base directory for a namespace prefix.
33	*
34	* @param string $prefix The namespace prefix.
35	* @param string $baseDir A base directory for class files in the
36	* namespace.
37	* @param bool $prepend If true, prepend the base directory to the stack
38	* instead of appending it; this causes it to be searched first rather
39	* than last.
40	* @return void
41	*/
42	public function addNamespace($prefix, $baseDir, $prepend = false)
43	{
44	// normalize namespace prefix
45	$prefix = trim($prefix, '\\') . '\\';
46
47	// normalize the base directory with a trailing separator
48	$baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR) . '/';
49
50	// initialize the namespace prefix array
51	if (isset($this->prefixes[$prefix]) === false) {
52	$this->prefixes[$prefix] = array();
53	}
54
55	// retain the base directory for the namespace prefix
56	if ($prepend) {
57	array_unshift($this->prefixes[$prefix], $baseDir);
58	} else {
59	array_push($this->prefixes[$prefix], $baseDir);
60	}
61	}
62
63	/**
64	* Loads the class file for a given class name.
65	*
66	* @param string $class The fully-qualified class name.
67	* @return mixed The mapped file name on success, or boolean false on
68	* failure.
69	*/
70	public function loadClass($class)
71	{
72	// the current namespace prefix
73	$prefix = $class;
74
75	// work backwards through the namespace names of the fully-qualified
76	// class name to find a mapped file name
77	while (false !== $pos = strrpos($prefix, '\\')) {
78
79	// retain the trailing namespace separator in the prefix
80	$prefix = substr($class, 0, $pos + 1);
81
82	// the rest is the relative class name
83	$relativeClass = substr($class, $pos + 1);
84
85	// try to load a mapped file for the prefix and relative class
86	$mappedFile = $this->loadMappedFile($prefix, $relativeClass);
87	if ($mappedFile !== false) {
88	return $mappedFile;
89	}
90
91	// remove the trailing namespace separator for the next iteration
92	// of strrpos()
93	$prefix = rtrim($prefix, '\\');
94	}
95
96	// never found a mapped file
97	return false;
98	}
99
100	/**
101	* Load the mapped file for a namespace prefix and relative class.
102	*
103	* @param string $prefix The namespace prefix.
104	* @param string $relativeClass The relative class name.
105	* @return mixed Boolean false if no mapped file can be loaded, or the
106	* name of the mapped file that was loaded.
107	*/
108	protected function loadMappedFile($prefix, $relativeClass)
109	{
110	// are there any base directories for this namespace prefix?
111	if (isset($this->prefixes[$prefix]) === false) {
112	return false;
113	}
114
115	// look through base directories for this namespace prefix
116	foreach ($this->prefixes[$prefix] as $baseDir) {
117
118	// replace the namespace prefix with the base directory,
119	// replace namespace separators with directory separators
120	// in the relative class name, append with .php
121	$file = $baseDir
122	. str_replace('\\', '/', $relativeClass)
123	. '.php';
124
125	// if the mapped file exists, require it
126	if ($this->requireFile($file)) {
127	// yes, we're done
128	return $file;
129	}
130	}
131
132	// never found it
133	return false;
134	}
135
136	/**
137	* If a file exists, require it from the file system.
138	*
139	* @param string $file The file to require.
140	* @return bool True if the file exists, false if not.
141	*/
142	protected function requireFile($file)
143	{
144	if (file_exists($file)) {
145	require $file;
146	return true;
147	}
148	return false;
149	}
150	}
151