fluent-cart / vendor / openspout / openspout / src / Autoloader / Psr4Autoloader.php

Psr4Autoloader.php in FluentCart A New Era of eCommerce – Faster, Lighter, and Simpler 1.3.22, at vendor/openspout/openspout/src/Autoloader/Psr4Autoloader.php

128 lines 4.5 KB

Raw Download Zip

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