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1 | <?php |
2 | /** |
3 | * |
4 | * This file is part of the phpBB Forum Software package. |
5 | * |
6 | * @copyright (c) phpBB Limited <https://www.phpbb.com> |
7 | * @license GNU General Public License, version 2 (GPL-2.0) |
8 | * |
9 | * For full copyright and license information, please see |
10 | * the docs/CREDITS.txt file. |
11 | * |
12 | */ |
13 | |
14 | namespace phpbb; |
15 | |
16 | /** |
17 | * The class loader resolves class names to file system paths and loads them if |
18 | * necessary. |
19 | * |
20 | * Classes have to be of the form phpbb_(dir_)*(classpart_)*, so directory names |
21 | * must never contain underscores. Example: phpbb_dir_subdir_class_name is a |
22 | * valid class name, while phpbb_dir_sub_dir_class_name is not. |
23 | * |
24 | * If every part of the class name is a directory, the last directory name is |
25 | * also used as the filename, e.g. phpbb_dir would resolve to dir/dir.php. |
26 | */ |
27 | class class_loader |
28 | { |
29 | private $namespace; |
30 | private $path; |
31 | private $php_ext; |
32 | private $cache; |
33 | |
34 | /** |
35 | * A map of looked up class names to paths relative to $this->path. |
36 | * This map is stored in cache and looked up if the cache is available. |
37 | * |
38 | * @var array |
39 | */ |
40 | private $cached_paths = array(); |
41 | |
42 | /** |
43 | * Creates a new \phpbb\class_loader, which loads files with the given |
44 | * file extension from the given path. |
45 | * |
46 | * @param string $namespace Required namespace for files to be loaded |
47 | * @param string $path Directory to load files from |
48 | * @param string $php_ext The file extension for PHP files |
49 | * @param \phpbb\cache\driver\driver_interface|null $cache An implementation of the phpBB cache interface. |
50 | */ |
51 | public function __construct($namespace, $path, $php_ext = 'php', \phpbb\cache\driver\driver_interface $cache = null) |
52 | { |
53 | if ($namespace[0] !== '\\') |
54 | { |
55 | $namespace = '\\' . $namespace; |
56 | } |
57 | |
58 | $this->namespace = $namespace; |
59 | $this->path = $path; |
60 | $this->php_ext = $php_ext; |
61 | |
62 | $this->set_cache($cache); |
63 | } |
64 | |
65 | /** |
66 | * Provide the class loader with a cache to store paths. If set to null, the |
67 | * the class loader will resolve paths by checking for the existence of every |
68 | * directory in the class name every time. |
69 | * |
70 | * @param \phpbb\cache\driver\driver_interface|null $cache An implementation of the phpBB cache interface. |
71 | */ |
72 | public function set_cache(\phpbb\cache\driver\driver_interface $cache = null) |
73 | { |
74 | if ($cache) |
75 | { |
76 | $this->cached_paths = $cache->get('class_loader_' . str_replace('\\', '__', $this->namespace)); |
77 | |
78 | if ($this->cached_paths === false) |
79 | { |
80 | $this->cached_paths = array(); |
81 | } |
82 | } |
83 | |
84 | $this->cache = $cache; |
85 | } |
86 | |
87 | /** |
88 | * Registers the class loader as an autoloader using SPL. |
89 | */ |
90 | public function register() |
91 | { |
92 | spl_autoload_register(array($this, 'load_class')); |
93 | } |
94 | |
95 | /** |
96 | * Removes the class loader from the SPL autoloader stack. |
97 | */ |
98 | public function unregister() |
99 | { |
100 | spl_autoload_unregister(array($this, 'load_class')); |
101 | } |
102 | |
103 | /** |
104 | * Resolves a phpBB class name to a relative path which can be included. |
105 | * |
106 | * @param string $class The class name to resolve, must be in the |
107 | * namespace the loader was constructed with. |
108 | * Has to begin with \ |
109 | * @return string|bool A relative path to the file containing the |
110 | * class or false if looking it up failed. |
111 | */ |
112 | public function resolve_path($class) |
113 | { |
114 | if (isset($this->cached_paths[$class])) |
115 | { |
116 | return $this->path . $this->cached_paths[$class] . '.' . $this->php_ext; |
117 | } |
118 | |
119 | if (!preg_match('/^' . preg_quote($this->namespace, '/') . '[a-zA-Z0-9_\\\\]+$/', $class)) |
120 | { |
121 | return false; |
122 | } |
123 | |
124 | $relative_path = str_replace('\\', '/', substr($class, strlen($this->namespace))); |
125 | |
126 | if (!file_exists($this->path . $relative_path . '.' . $this->php_ext)) |
127 | { |
128 | return false; |
129 | } |
130 | |
131 | if ($this->cache) |
132 | { |
133 | $this->cached_paths[$class] = $relative_path; |
134 | $this->cache->put('class_loader_' . str_replace('\\', '__', $this->namespace), $this->cached_paths); |
135 | } |
136 | |
137 | return $this->path . $relative_path . '.' . $this->php_ext; |
138 | } |
139 | |
140 | /** |
141 | * Resolves a class name to a path and then includes it. |
142 | * |
143 | * @param string $class The class name which is being loaded. |
144 | */ |
145 | public function load_class($class) |
146 | { |
147 | // In general $class is not supposed to contain a leading backslash, |
148 | // but sometimes it does. See tickets PHP-50731 and HHVM-1840. |
149 | if ($class[0] !== '\\') |
150 | { |
151 | $class = '\\' . $class; |
152 | } |
153 | |
154 | if (substr($class, 0, strlen($this->namespace)) === $this->namespace) |
155 | { |
156 | $path = $this->resolve_path($class); |
157 | |
158 | if ($path) |
159 | { |
160 | require $path; |
161 | } |
162 | } |
163 | } |
164 | } |