source: trunk/client/inc/hpdf5/composer/ClassLoader.php@ 407

Last change on this file since 407 was 347, checked in by roby, 3 years ago

Aggiornamento per compatibilità con php7.4
File size: 14.0 KB
RevLine 
[347]1<?php
2
3/*
4 * This file is part of Composer.
5 *
6 * (c) Nils Adermann <naderman@naderman.de>
7 * Jordi Boggiano <j.boggiano@seld.be>
8 *
9 * For the full copyright and license information, please view the LICENSE
10 * file that was distributed with this source code.
11 */
12
13namespace Composer\Autoload;
14
15/**
16 * ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
17 *
18 * $loader = new \Composer\Autoload\ClassLoader();
19 *
20 * // register classes with namespaces
21 * $loader->add('Symfony\Component', __DIR__.'/component');
22 * $loader->add('Symfony', __DIR__.'/framework');
23 *
24 * // activate the autoloader
25 * $loader->register();
26 *
27 * // to enable searching the include path (eg. for PEAR packages)
28 * $loader->setUseIncludePath(true);
29 *
30 * In this example, if you try to use a class in the Symfony\Component
31 * namespace or one of its children (Symfony\Component\Console for instance),
32 * the autoloader will first look for the class under the component/
33 * directory, and it will then fallback to the framework/ directory if not
34 * found before giving up.
35 *
36 * This class is loosely based on the Symfony UniversalClassLoader.
37 *
38 * @author Fabien Potencier <fabien@symfony.com>
39 * @author Jordi Boggiano <j.boggiano@seld.be>
40 * @see https://www.php-fig.org/psr/psr-0/
41 * @see https://www.php-fig.org/psr/psr-4/
42 */
43class ClassLoader
44{
45 private $vendorDir;
46
47 // PSR-4
48 private $prefixLengthsPsr4 = array();
49 private $prefixDirsPsr4 = array();
50 private $fallbackDirsPsr4 = array();
51
52 // PSR-0
53 private $prefixesPsr0 = array();
54 private $fallbackDirsPsr0 = array();
55
56 private $useIncludePath = false;
57 private $classMap = array();
58 private $classMapAuthoritative = false;
59 private $missingClasses = array();
60 private $apcuPrefix;
61
62 private static $registeredLoaders = array();
63
64 public function __construct($vendorDir = null)
65 {
66 $this->vendorDir = $vendorDir;
67 }
68
69 public function getPrefixes()
70 {
71 if (!empty($this->prefixesPsr0)) {
72 return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
73 }
74
75 return array();
76 }
77
78 public function getPrefixesPsr4()
79 {
80 return $this->prefixDirsPsr4;
81 }
82
83 public function getFallbackDirs()
84 {
85 return $this->fallbackDirsPsr0;
86 }
87
88 public function getFallbackDirsPsr4()
89 {
90 return $this->fallbackDirsPsr4;
91 }
92
93 public function getClassMap()
94 {
95 return $this->classMap;
96 }
97
98 /**
99 * @param array $classMap Class to filename map
100 */
101 public function addClassMap(array $classMap)
102 {
103 if ($this->classMap) {
104 $this->classMap = array_merge($this->classMap, $classMap);
105 } else {
106 $this->classMap = $classMap;
107 }
108 }
109
110 /**
111 * Registers a set of PSR-0 directories for a given prefix, either
112 * appending or prepending to the ones previously set for this prefix.
113 *
114 * @param string $prefix The prefix
115 * @param array|string $paths The PSR-0 root directories
116 * @param bool $prepend Whether to prepend the directories
117 */
118 public function add($prefix, $paths, $prepend = false)
119 {
120 if (!$prefix) {
121 if ($prepend) {
122 $this->fallbackDirsPsr0 = array_merge(
123 (array) $paths,
124 $this->fallbackDirsPsr0
125 );
126 } else {
127 $this->fallbackDirsPsr0 = array_merge(
128 $this->fallbackDirsPsr0,
129 (array) $paths
130 );
131 }
132
133 return;
134 }
135
136 $first = $prefix[0];
137 if (!isset($this->prefixesPsr0[$first][$prefix])) {
138 $this->prefixesPsr0[$first][$prefix] = (array) $paths;
139
140 return;
141 }
142 if ($prepend) {
143 $this->prefixesPsr0[$first][$prefix] = array_merge(
144 (array) $paths,
145 $this->prefixesPsr0[$first][$prefix]
146 );
147 } else {
148 $this->prefixesPsr0[$first][$prefix] = array_merge(
149 $this->prefixesPsr0[$first][$prefix],
150 (array) $paths
151 );
152 }
153 }
154
155 /**
156 * Registers a set of PSR-4 directories for a given namespace, either
157 * appending or prepending to the ones previously set for this namespace.
158 *
159 * @param string $prefix The prefix/namespace, with trailing '\\'
160 * @param array|string $paths The PSR-4 base directories
161 * @param bool $prepend Whether to prepend the directories
162 *
163 * @throws \InvalidArgumentException
164 */
165 public function addPsr4($prefix, $paths, $prepend = false)
166 {
167 if (!$prefix) {
168 // Register directories for the root namespace.
169 if ($prepend) {
170 $this->fallbackDirsPsr4 = array_merge(
171 (array) $paths,
172 $this->fallbackDirsPsr4
173 );
174 } else {
175 $this->fallbackDirsPsr4 = array_merge(
176 $this->fallbackDirsPsr4,
177 (array) $paths
178 );
179 }
180 } elseif (!isset($this->prefixDirsPsr4[$prefix])) {
181 // Register directories for a new namespace.
182 $length = strlen($prefix);
183 if ('\\' !== $prefix[$length - 1]) {
184 throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
185 }
186 $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
187 $this->prefixDirsPsr4[$prefix] = (array) $paths;
188 } elseif ($prepend) {
189 // Prepend directories for an already registered namespace.
190 $this->prefixDirsPsr4[$prefix] = array_merge(
191 (array) $paths,
192 $this->prefixDirsPsr4[$prefix]
193 );
194 } else {
195 // Append directories for an already registered namespace.
196 $this->prefixDirsPsr4[$prefix] = array_merge(
197 $this->prefixDirsPsr4[$prefix],
198 (array) $paths
199 );
200 }
201 }
202
203 /**
204 * Registers a set of PSR-0 directories for a given prefix,
205 * replacing any others previously set for this prefix.
206 *
207 * @param string $prefix The prefix
208 * @param array|string $paths The PSR-0 base directories
209 */
210 public function set($prefix, $paths)
211 {
212 if (!$prefix) {
213 $this->fallbackDirsPsr0 = (array) $paths;
214 } else {
215 $this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths;
216 }
217 }
218
219 /**
220 * Registers a set of PSR-4 directories for a given namespace,
221 * replacing any others previously set for this namespace.
222 *
223 * @param string $prefix The prefix/namespace, with trailing '\\'
224 * @param array|string $paths The PSR-4 base directories
225 *
226 * @throws \InvalidArgumentException
227 */
228 public function setPsr4($prefix, $paths)
229 {
230 if (!$prefix) {
231 $this->fallbackDirsPsr4 = (array) $paths;
232 } else {
233 $length = strlen($prefix);
234 if ('\\' !== $prefix[$length - 1]) {
235 throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
236 }
237 $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
238 $this->prefixDirsPsr4[$prefix] = (array) $paths;
239 }
240 }
241
242 /**
243 * Turns on searching the include path for class files.
244 *
245 * @param bool $useIncludePath
246 */
247 public function setUseIncludePath($useIncludePath)
248 {
249 $this->useIncludePath = $useIncludePath;
250 }
251
252 /**
253 * Can be used to check if the autoloader uses the include path to check
254 * for classes.
255 *
256 * @return bool
257 */
258 public function getUseIncludePath()
259 {
260 return $this->useIncludePath;
261 }
262
263 /**
264 * Turns off searching the prefix and fallback directories for classes
265 * that have not been registered with the class map.
266 *
267 * @param bool $classMapAuthoritative
268 */
269 public function setClassMapAuthoritative($classMapAuthoritative)
270 {
271 $this->classMapAuthoritative = $classMapAuthoritative;
272 }
273
274 /**
275 * Should class lookup fail if not found in the current class map?
276 *
277 * @return bool
278 */
279 public function isClassMapAuthoritative()
280 {
281 return $this->classMapAuthoritative;
282 }
283
284 /**
285 * APCu prefix to use to cache found/not-found classes, if the extension is enabled.
286 *
287 * @param string|null $apcuPrefix
288 */
289 public function setApcuPrefix($apcuPrefix)
290 {
291 $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
292 }
293
294 /**
295 * The APCu prefix in use, or null if APCu caching is not enabled.
296 *
297 * @return string|null
298 */
299 public function getApcuPrefix()
300 {
301 return $this->apcuPrefix;
302 }
303
304 /**
305 * Registers this instance as an autoloader.
306 *
307 * @param bool $prepend Whether to prepend the autoloader or not
308 */
309 public function register($prepend = false)
310 {
311 spl_autoload_register(array($this, 'loadClass'), true, $prepend);
312
313 if (null === $this->vendorDir) {
314 //no-op
315 } elseif ($prepend) {
316 self::$registeredLoaders = array($this->vendorDir => $this) + self::$registeredLoaders;
317 } else {
318 unset(self::$registeredLoaders[$this->vendorDir]);
319 self::$registeredLoaders[$this->vendorDir] = $this;
320 }
321 }
322
323 /**
324 * Unregisters this instance as an autoloader.
325 */
326 public function unregister()
327 {
328 spl_autoload_unregister(array($this, 'loadClass'));
329
330 if (null !== $this->vendorDir) {
331 unset(self::$registeredLoaders[$this->vendorDir]);
332 }
333 }
334
335 /**
336 * Loads the given class or interface.
337 *
338 * @param string $class The name of the class
339 * @return bool|null True if loaded, null otherwise
340 */
341 public function loadClass($class)
342 {
343 if ($file = $this->findFile($class)) {
344 includeFile($file);
345
346 return true;
347 }
348 }
349
350 /**
351 * Finds the path to the file where the class is defined.
352 *
353 * @param string $class The name of the class
354 *
355 * @return string|false The path if found, false otherwise
356 */
357 public function findFile($class)
358 {
359 // class map lookup
360 if (isset($this->classMap[$class])) {
361 return $this->classMap[$class];
362 }
363 if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) {
364 return false;
365 }
366 if (null !== $this->apcuPrefix) {
367 $file = apcu_fetch($this->apcuPrefix.$class, $hit);
368 if ($hit) {
369 return $file;
370 }
371 }
372
373 $file = $this->findFileWithExtension($class, '.php');
374
375 // Search for Hack files if we are running on HHVM
376 if (false === $file && defined('HHVM_VERSION')) {
377 $file = $this->findFileWithExtension($class, '.hh');
378 }
379
380 if (null !== $this->apcuPrefix) {
381 apcu_add($this->apcuPrefix.$class, $file);
382 }
383
384 if (false === $file) {
385 // Remember that this class does not exist.
386 $this->missingClasses[$class] = true;
387 }
388
389 return $file;
390 }
391
392 /**
393 * Returns the currently registered loaders indexed by their corresponding vendor directories.
394 *
395 * @return self[]
396 */
397 public static function getRegisteredLoaders()
398 {
399 return self::$registeredLoaders;
400 }
401
402 private function findFileWithExtension($class, $ext)
403 {
404 // PSR-4 lookup
405 $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
406
407 $first = $class[0];
408 if (isset($this->prefixLengthsPsr4[$first])) {
409 $subPath = $class;
410 while (false !== $lastPos = strrpos($subPath, '\\')) {
411 $subPath = substr($subPath, 0, $lastPos);
412 $search = $subPath . '\\';
413 if (isset($this->prefixDirsPsr4[$search])) {
414 $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
415 foreach ($this->prefixDirsPsr4[$search] as $dir) {
416 if (file_exists($file = $dir . $pathEnd)) {
417 return $file;
418 }
419 }
420 }
421 }
422 }
423
424 // PSR-4 fallback dirs
425 foreach ($this->fallbackDirsPsr4 as $dir) {
426 if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
427 return $file;
428 }
429 }
430
431 // PSR-0 lookup
432 if (false !== $pos = strrpos($class, '\\')) {
433 // namespaced class name
434 $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
435 . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
436 } else {
437 // PEAR-like class name
438 $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
439 }
440
441 if (isset($this->prefixesPsr0[$first])) {
442 foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
443 if (0 === strpos($class, $prefix)) {
444 foreach ($dirs as $dir) {
445 if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
446 return $file;
447 }
448 }
449 }
450 }
451 }
452
453 // PSR-0 fallback dirs
454 foreach ($this->fallbackDirsPsr0 as $dir) {
455 if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
456 return $file;
457 }
458 }
459
460 // PSR-0 include paths.
461 if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
462 return $file;
463 }
464
465 return false;
466 }
467}
468
469/**
470 * Scope isolated include.
471 *
472 * Prevents access to $this/self from included files.
473 */
474function includeFile($file)
475{
476 include $file;
477}
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