ClassLoader::__construct() - Code Metrics - Riimu/Kit-ClassLoader - Measure and Improve Code Quality continuously with Scrutinizer

ClassLoader::__construct() A
last analyzed 2017-07-16 09:48 UTC

↳ Parent: ClassLoader

Complexity

Conditions	1
Paths	1

Size

Total Lines	9
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	9
ccs	8
cts	8
cp	1
rs	9.6666
c	0
b	0
f	0
cc	1
eloc	7
nc	1
nop	0
crap	1

<?php

namespace Riimu\Kit\ClassLoader;

/**
 * Class loader that supports both PSR-0 and PSR-4 autoloading standards.
 *
 * The purpose autoloading classes is to load the class files only as they are
 * needed. This reduces the overall page overhead, as every file does not need
 * to be requested on every request. It also makes managing class loading much
 * simpler.
 *
 * The standard practice in autoloading is to place classes in files that are
 * named according to the class names and placed in a directory hierarchy
 * according to their namespace. ClassLoader supports two such standard
 * autoloading practices: PSR-0 and PSR-4.
 *
 * Class paths can be provided as base paths, which are appended with the full
 * class name (as per PSR-0), or as prefix paths that can replace part of the
 * namespace with a specific directory (as per PSR-4). Depending on which kind
 * of paths are added, the underscores may or may not be treated as namespace
 * separators.
 *
 * @see http://www.php-fig.org/psr/psr-0/
 * @see http://www.php-fig.org/psr/psr-4/
 * @author Riikka Kalliomäki <[email protected]>
 * @copyright Copyright (c) 2014-2017 Riikka Kalliomäki
 * @license http://opensource.org/licenses/mit-license.php MIT License
 */
class ClassLoader
{
    /** @var array List of PSR-4 compatible paths by namespace */
    private $prefixPaths;

    /** @var array List of PSR-0 compatible paths by namespace */
    private $basePaths;

    /** @var bool Whether to look for classes in include_path or not */
    private $useIncludePath;

    /** @var callable The autoload method used to load classes */
    private $loader;

    /** @var \Riimu\Kit\ClassLoader\ClassFinder Finder used to find class files */
    private $finder;

    /** @var bool Whether loadClass should return values and throw exceptions or not */
    protected $verbose;

    /**
     * Creates a new ClassLoader instance.
     */
    public function __construct()
    {
        $this->prefixPaths = [];
        $this->basePaths = [];
        $this->useIncludePath = false;
        $this->verbose = true;
        $this->loader = [$this, 'loadClass'];
        $this->finder = new ClassFinder();
    }

    /**
     * Registers this instance as a class autoloader.
     * @return bool True if the registration was successful, false if not
     */
    public function register()
    {
        return spl_autoload_register($this->loader);
    }

    /**
     * Unregisters this instance as a class autoloader.
     * @return bool True if the unregistration was successful, false if not
     */
    public function unregister()
    {
        return spl_autoload_unregister($this->loader);
    }

    /**
     * Tells if this instance is currently registered as a class autoloader.
     * @return bool True if registered, false if not
     */
    public function isRegistered()
    {
        return in_array($this->loader, spl_autoload_functions(), true);
    }

    /**
     * Tells whether to use include_path as part of base paths.
     *
     * When enabled, the directory paths in include_path are treated as base
     * paths where to look for classes. This option defaults to false for PSR-4
     * compliance.
     *
     * @param bool $enabled True to use include_path, false to not use
     * @return ClassLoader Returns self for call chaining
     */
    public function useIncludePath($enabled = true)
    {
        $this->useIncludePath = (bool) $enabled;

        return $this;
    }

    /**
     * Sets whether to return values and throw exceptions from loadClass.
     *
     * PSR-4 requires that autoloaders do not return values and do not throw
     * exceptions from the autoloader. By default, the verbose mode is set to
     * false for PSR-4 compliance.
     *
     * @param bool $enabled True to return values and exceptions, false to not
     * @return ClassLoader Returns self for call chaining
     */
    public function setVerbose($enabled)
    {
        $this->verbose = (bool) $enabled;

        return $this;
    }

    /**
     * Sets list of dot included file extensions to use for finding files.
     *
     * If no list of extensions is provided, the extension array defaults to
     * just '.php'.
     *
     * @param string[] $extensions Array of dot included file extensions to use
     * @return ClassLoader Returns self for call chaining
     */
    public function setFileExtensions(array $extensions)
    {
        $this->finder->setFileExtensions($extensions);

        return $this;
    }

    /**
     * Adds a PSR-0 compliant base path for searching classes.
     *
     * In PSR-0, the class namespace structure directly reflects the location
     * in the directory tree. A base path indicates the base directory where to
     * search for classes. For example, if the class 'Foo\Bar', is defined in
     * '/usr/lib/Foo/Bar.php', you would simply need to add the directory
     * '/usr/lib' by calling:
     *
     * <code>addBasePath('/usr/lib')</code>
     *
     * Additionally, you may specify that the base path applies only to a
     * specific namespace. You can do this by adding the namespace as the second
     * parameter. For example, if you would like the path in the previous
     * example to only apply to the namespace 'Foo', you could do so by calling:
     *
     * <code>addBasePath('/usr/lib/', 'Foo')</code>
     *
     * Note that as per PSR-0, the underscores in the class name are treated
     * as namespace separators. Therefore 'Foo_Bar_Baz', would need to reside
     * in 'Foo/Bar/Baz.php'. Regardless of whether the namespace is indicated
     * by namespace separators or underscores, the namespace parameter must be
     * defined using namespace separators, e.g 'Foo\Bar'.
     *
     * In addition to providing a single path as a string, you may also provide
     * an array of paths. It is also possible to provide an associative array
     * where the keys indicate the namespaces. Each value in the associative
     * array may also be a string or an array of paths.
     *
     * @param string|array $path Single path, array of paths or an associative array
     * @param string|null $namespace Limit the path only to specific namespace
     * @return ClassLoader Returns self for call chaining
     */
    public function addBasePath($path, $namespace = null)
    {
        $this->addPath($this->basePaths, $path, $namespace);

        return $this;
    }

    /**
     * Returns all known base paths.
     *
     * The paths will be returned as an associative array. The key indicates
     * the namespace and the values are arrays that contain all paths that
     * apply to that specific namespace. Paths that apply to all namespaces can
     * be found inside the key '' (i.e. empty string). Note that the array does
     * not include the paths in include_path even if the use of include_path is
     * enabled.
     *
     * @return array All known base paths
     */
    public function getBasePaths()
    {
        return $this->basePaths;
    }

    /**
     * Adds a PSR-4 compliant prefix path for searching classes.
     *
     * In PSR-4, it is possible to replace part of namespace with specific
     * path in the directory tree instead of requiring the entire namespace
     * structure to be present in the directory tree. For example, if the class
     * 'Vendor\Library\Class' is located in '/usr/lib/Library/src/Class.php',
     * You would need to add the path '/usr/lib/Library/src' to the namespace
     * 'Vendor\Library' by calling:
     *
     * <code>addPrefixPath('/usr/lib/Library/src', 'Vendor\Library')</code>
     *
     * If the method is called without providing a namespace, then the paths
     * work similarly to paths added via addBasePath(), except that the
     * underscores in the file name are not treated as namespace separators.
     *
     * Similarly to addBasePath(), the paths may be provided as an array or you
     * can just provide a single associative array as the parameter.
     *
     * @param string|array $path Single path or array of paths
     * @param string|null $namespace The namespace prefix the given path replaces
     * @return ClassLoader Returns self for call chaining
     */
    public function addPrefixPath($path, $namespace = null)
    {
        $this->addPath($this->prefixPaths, $path, $namespace);

        return $this;
    }

    /**
     * Returns all known prefix paths.
     *
     * The paths will be returned as an associative array. The key indicates
     * the namespace and the values are arrays that contain all paths that
     * apply to that specific namespace. Paths that apply to all namespaces can
     * be found inside the key '' (i.e. empty string).
     *
     * @return array All known prefix paths
     */
    public function getPrefixPaths()
    {
        return $this->prefixPaths;
    }

    /**
     * Adds the paths to the list of paths according to the provided parameters.
     * @param array $list List of paths to modify
     * @param string|array $path Single path or array of paths
     * @param string|null $namespace The namespace definition
     */
    private function addPath(& $list, $path, $namespace)
    {
        if ($namespace !== null) {
            $paths = [$namespace => $path];
        } else {
            $paths = is_array($path) ? $path : ['' => $path];
        }

        foreach ($paths as $ns => $directories) {
            $this->addNamespacePaths($list, ltrim($ns, '0..9'), $directories);
        }
    }

    /**
     * Canonizes the namespace and adds the paths to that specific namespace.
     * @param array $list List of paths to modify
     * @param string $namespace Namespace for the paths
     * @param string[] $paths List of paths for the namespace
     */
    private function addNamespacePaths(& $list, $namespace, $paths)
    {
        $namespace = $namespace === '' ? '' : trim($namespace, '\\') . '\\';

        if (!isset($list[$namespace])) {
            $list[$namespace] = [];
        }

        if (is_array($paths)) {
            $list[$namespace] = array_merge($list[$namespace], $paths);
        } else {
            $list[$namespace][] = $paths;
        }
    }

    /**
     * Attempts to load the class using known class paths.
     *
     * The classes will be searched using the prefix paths, base paths and the
     * include_path (if enabled) in that order. Other than that, the autoloader
     * makes no guarantees about the order of the searched paths.
     *
     * If verbose mode is enabled, then the method will return true if the class
     * loading was successful and false if not. Additionally the method will
     * throw an exception if the class already exists or if the class was not
     * defined in the file that was included.
     *
     * @param string $class Full name of the class to load
     * @return bool|null True if the class was loaded, false if not
     * @throws \RuntimeException If the class was not defined in the included file
     * @throws \InvalidArgumentException If the class already exists
     */
    public function loadClass($class)
    {
        if ($this->verbose) {
            return $this->load($class);
        }

        try {
            $this->load($class);
        } catch (\Exception $exception) {
            // Ignore exceptions as per PSR-4
        }
    }

    /**
     * Actually loads the class without any regard to verbose setting.
     * @param string $class Full name of the class to load
     * @return bool True if the class was loaded, false if not
     * @throws \InvalidArgumentException If the class already exists
     */
    private function load($class)
    {
        if ($this->isLoaded($class)) {
            throw new \InvalidArgumentException(sprintf(
                "Error loading class '%s', the class already exists",
                $class
            ));
        }

        if ($file = $this->findFile($class)) {
            return $this->loadFile($file, $class);
        }

        return false;
    }

    /**
     * Attempts to find a file for the given class using known paths.
     * @param string $class Full name of the class
     * @return string|false Path to the class file or false if not found
     */
    public function findFile($class)
    {
        return $this->finder->findFile($class, $this->prefixPaths, $this->basePaths, $this->useIncludePath);
    }

    /**
     * Includes the file and makes sure the class exists.
     * @param string $file Full path to the file
     * @param string $class Full name of the class
     * @return bool Always returns true
     * @throws \RuntimeException If the class was not defined in the included file
     */
    protected function loadFile($file, $class)
    {
        include $file;

        if (!$this->isLoaded($class)) {
            throw new \RuntimeException(vsprintf(
                "Error loading class '%s', the class was not defined in the file '%s'",
                [$class, $file]
            ));
        }

        return true;
    }

    /**
     * Tells if a class, interface or trait exists with given name.
     * @param string $class Full name of the class
     * @return bool True if it exists, false if not
     */
    private function isLoaded($class)
    {
        return class_exists($class, false) ||
            interface_exists($class, false) ||
            trait_exists($class, false);
    }
}


1		<?php
2
3		namespace Riimu\Kit\ClassLoader;
4
5		/**
6		* Class loader that supports both PSR-0 and PSR-4 autoloading standards.
7		*
8		* The purpose autoloading classes is to load the class files only as they are
9		* needed. This reduces the overall page overhead, as every file does not need
10		* to be requested on every request. It also makes managing class loading much
11		* simpler.
12		*
13		* The standard practice in autoloading is to place classes in files that are
14		* named according to the class names and placed in a directory hierarchy
15		* according to their namespace. ClassLoader supports two such standard
16		* autoloading practices: PSR-0 and PSR-4.
17		*
18		* Class paths can be provided as base paths, which are appended with the full
19		* class name (as per PSR-0), or as prefix paths that can replace part of the
20		* namespace with a specific directory (as per PSR-4). Depending on which kind
21		* of paths are added, the underscores may or may not be treated as namespace
22		* separators.
23		*
24		* @see http://www.php-fig.org/psr/psr-0/
25		* @see http://www.php-fig.org/psr/psr-4/
26		* @author Riikka Kalliomäki <[email protected]>
27		* @copyright Copyright (c) 2014-2017 Riikka Kalliomäki
28		* @license http://opensource.org/licenses/mit-license.php MIT License
29		*/
30		class ClassLoader
31		{
32		/** @var array List of PSR-4 compatible paths by namespace */
33		private $prefixPaths;
34
35		/** @var array List of PSR-0 compatible paths by namespace */
36		private $basePaths;
37
38		/** @var bool Whether to look for classes in include_path or not */
39		private $useIncludePath;
40
41		/** @var callable The autoload method used to load classes */
42		private $loader;
43
44		/** @var \Riimu\Kit\ClassLoader\ClassFinder Finder used to find class files */
45		private $finder;
46
47		/** @var bool Whether loadClass should return values and throw exceptions or not */
48		protected $verbose;
49
50		/**
51		* Creates a new ClassLoader instance.
52		*/
53	96	public function __construct()
54		{
55	96	$this->prefixPaths = [];
56	96	$this->basePaths = [];
57	96	$this->useIncludePath = false;
58	96	$this->verbose = true;
59	96	$this->loader = [$this, 'loadClass'];
60	96	$this->finder = new ClassFinder();
61	96	}
62
63		/**
64		* Registers this instance as a class autoloader.
65		* @return bool True if the registration was successful, false if not
66		*/
67	18	public function register()
68		{
69	18	return spl_autoload_register($this->loader);
70		}
71
72		/**
73		* Unregisters this instance as a class autoloader.
74		* @return bool True if the unregistration was successful, false if not
75		*/
76	24	public function unregister()
77		{
78	24	return spl_autoload_unregister($this->loader);
79		}
80
81		/**
82		* Tells if this instance is currently registered as a class autoloader.
83		* @return bool True if registered, false if not
84		*/
85	9	public function isRegistered()
86		{
87	9	return in_array($this->loader, spl_autoload_functions(), true);
88		}
89
90		/**
91		* Tells whether to use include_path as part of base paths.
92		*
93		* When enabled, the directory paths in include_path are treated as base
94		* paths where to look for classes. This option defaults to false for PSR-4
95		* compliance.
96		*
97		* @param bool $enabled True to use include_path, false to not use
98		* @return ClassLoader Returns self for call chaining
99		*/
100	3	public function useIncludePath($enabled = true)
101		{
102	3	$this->useIncludePath = (bool) $enabled;
103
104	3	return $this;
105		}
106
107		/**
108		* Sets whether to return values and throw exceptions from loadClass.
109		*
110		* PSR-4 requires that autoloaders do not return values and do not throw
111		* exceptions from the autoloader. By default, the verbose mode is set to
112		* false for PSR-4 compliance.
113		*
114		* @param bool $enabled True to return values and exceptions, false to not
115		* @return ClassLoader Returns self for call chaining
116		*/
117	24	public function setVerbose($enabled)
118		{
119	24	$this->verbose = (bool) $enabled;
120
121	24	return $this;
122		}
123
124		/**
125		* Sets list of dot included file extensions to use for finding files.
126		*
127		* If no list of extensions is provided, the extension array defaults to
128		* just '.php'.
129		*
130		* @param string[] $extensions Array of dot included file extensions to use
131		* @return ClassLoader Returns self for call chaining
132		*/
133	3	public function setFileExtensions(array $extensions)
134		{
135	3	$this->finder->setFileExtensions($extensions);
136
137	3	return $this;
138		}
139
140		/**
141		* Adds a PSR-0 compliant base path for searching classes.
142		*
143		* In PSR-0, the class namespace structure directly reflects the location
144		* in the directory tree. A base path indicates the base directory where to
145		* search for classes. For example, if the class 'Foo\Bar', is defined in
146		* '/usr/lib/Foo/Bar.php', you would simply need to add the directory
147		* '/usr/lib' by calling:
148		*
149		* <code>addBasePath('/usr/lib')</code>
150		*
151		* Additionally, you may specify that the base path applies only to a
152		* specific namespace. You can do this by adding the namespace as the second
153		* parameter. For example, if you would like the path in the previous
154		* example to only apply to the namespace 'Foo', you could do so by calling:
155		*
156		* <code>addBasePath('/usr/lib/', 'Foo')</code>
157		*
158		* Note that as per PSR-0, the underscores in the class name are treated
159		* as namespace separators. Therefore 'Foo_Bar_Baz', would need to reside
160		* in 'Foo/Bar/Baz.php'. Regardless of whether the namespace is indicated
161		* by namespace separators or underscores, the namespace parameter must be
162		* defined using namespace separators, e.g 'Foo\Bar'.
163		*
164		* In addition to providing a single path as a string, you may also provide
165		* an array of paths. It is also possible to provide an associative array
166		* where the keys indicate the namespaces. Each value in the associative
167		* array may also be a string or an array of paths.
168		*
169		* @param string\|array $path Single path, array of paths or an associative array
170		* @param string\|null $namespace Limit the path only to specific namespace
171		* @return ClassLoader Returns self for call chaining
172		*/
173	63	public function addBasePath($path, $namespace = null)
174		{
175	63	$this->addPath($this->basePaths, $path, $namespace);
176
177	63	return $this;
178		}
179
180		/**
181		* Returns all known base paths.
182		*
183		* The paths will be returned as an associative array. The key indicates
184		* the namespace and the values are arrays that contain all paths that
185		* apply to that specific namespace. Paths that apply to all namespaces can
186		* be found inside the key '' (i.e. empty string). Note that the array does
187		* not include the paths in include_path even if the use of include_path is
188		* enabled.
189		*
190		* @return array All known base paths
191		*/
192	18	public function getBasePaths()
193		{
194	18	return $this->basePaths;
195		}
196
197		/**
198		* Adds a PSR-4 compliant prefix path for searching classes.
199		*
200		* In PSR-4, it is possible to replace part of namespace with specific
201		* path in the directory tree instead of requiring the entire namespace
202		* structure to be present in the directory tree. For example, if the class
203		* 'Vendor\Library\Class' is located in '/usr/lib/Library/src/Class.php',
204		* You would need to add the path '/usr/lib/Library/src' to the namespace
205		* 'Vendor\Library' by calling:
206		*
207		* <code>addPrefixPath('/usr/lib/Library/src', 'Vendor\Library')</code>
208		*
209		* If the method is called without providing a namespace, then the paths
210		* work similarly to paths added via addBasePath(), except that the
211		* underscores in the file name are not treated as namespace separators.
212		*
213		* Similarly to addBasePath(), the paths may be provided as an array or you
214		* can just provide a single associative array as the parameter.
215		*
216		* @param string\|array $path Single path or array of paths
217		* @param string\|null $namespace The namespace prefix the given path replaces
218		* @return ClassLoader Returns self for call chaining
219		*/
220	21	public function addPrefixPath($path, $namespace = null)
221		{
222	21	$this->addPath($this->prefixPaths, $path, $namespace);
223
224	21	return $this;
225		}
226
227		/**
228		* Returns all known prefix paths.
229		*
230		* The paths will be returned as an associative array. The key indicates
231		* the namespace and the values are arrays that contain all paths that
232		* apply to that specific namespace. Paths that apply to all namespaces can
233		* be found inside the key '' (i.e. empty string).
234		*
235		* @return array All known prefix paths
236		*/
237	18	public function getPrefixPaths()
238		{
239	18	return $this->prefixPaths;
240		}
241
242		/**
243		* Adds the paths to the list of paths according to the provided parameters.
244		* @param array $list List of paths to modify
245		* @param string\|array $path Single path or array of paths
246		* @param string\|null $namespace The namespace definition
247		*/
248	66	private function addPath(& $list, $path, $namespace)
249		{
250	66	if ($namespace !== null) {
251	21	$paths = [$namespace => $path];
252	7	} else {
253	51	$paths = is_array($path) ? $path : ['' => $path];
254		}
255
256	66	foreach ($paths as $ns => $directories) {
257	66	$this->addNamespacePaths($list, ltrim($ns, '0..9'), $directories);
258	22	}
259	66	}
260
261		/**
262		* Canonizes the namespace and adds the paths to that specific namespace.
263		* @param array $list List of paths to modify
264		* @param string $namespace Namespace for the paths
265		* @param string[] $paths List of paths for the namespace
266		*/
267	66	private function addNamespacePaths(& $list, $namespace, $paths)
268		{
269	66	$namespace = $namespace === '' ? '' : trim($namespace, '\\') . '\\';
270
271	66	if (!isset($list[$namespace])) {
272	66	$list[$namespace] = [];
273	22	}
274
275	66	if (is_array($paths)) {
276	12	$list[$namespace] = array_merge($list[$namespace], $paths);
277	4	} else {
278	60	$list[$namespace][] = $paths;
279		}
280	66	}
281
282		/**
283		* Attempts to load the class using known class paths.
284		*
285		* The classes will be searched using the prefix paths, base paths and the
286		* include_path (if enabled) in that order. Other than that, the autoloader
287		* makes no guarantees about the order of the searched paths.
288		*
289		* If verbose mode is enabled, then the method will return true if the class
290		* loading was successful and false if not. Additionally the method will
291		* throw an exception if the class already exists or if the class was not
292		* defined in the file that was included.
293		*
294		* @param string $class Full name of the class to load
295		* @return bool\|null True if the class was loaded, false if not
296		* @throws \RuntimeException If the class was not defined in the included file
297		* @throws \InvalidArgumentException If the class already exists
298		*/
299	57	public function loadClass($class)
300		{
301	57	if ($this->verbose) {
302	51	return $this->load($class);
303		}
304
305		try {
306	9	$this->load($class);
307	9	} catch (\Exception $exception) {
308		// Ignore exceptions as per PSR-4
309		}
310	9	}
311
312		/**
313		* Actually loads the class without any regard to verbose setting.
314		* @param string $class Full name of the class to load
315		* @return bool True if the class was loaded, false if not
316		* @throws \InvalidArgumentException If the class already exists
317		*/
318	57	private function load($class)
319		{
320	57	if ($this->isLoaded($class)) {
321	3	throw new \InvalidArgumentException(sprintf(
322	3	"Error loading class '%s', the class already exists",
323	1	$class
324	1	));
325		}
326
327	54	if ($file = $this->findFile($class)) {
328	39	return $this->loadFile($file, $class);
329		}
330
331	24	return false;
332		}
333
334		/**
335		* Attempts to find a file for the given class using known paths.
336		* @param string $class Full name of the class
337		* @return string\|false Path to the class file or false if not found
338		*/
339	60	public function findFile($class)
340		{
341	60	return $this->finder->findFile($class, $this->prefixPaths, $this->basePaths, $this->useIncludePath);
342		}
343
344		/**
345		* Includes the file and makes sure the class exists.
346		* @param string $file Full path to the file
347		* @param string $class Full name of the class
348		* @return bool Always returns true
349		* @throws \RuntimeException If the class was not defined in the included file
350		*/
351	39	protected function loadFile($file, $class)
352		{
353	39	include $file;
354
355	39	if (!$this->isLoaded($class)) {
356	9	throw new \RuntimeException(vsprintf(
357	9	"Error loading class '%s', the class was not defined in the file '%s'",
358	9	[$class, $file]
359	3	));
360		}
361
362	30	return true;
363		}
364
365		/**
366		* Tells if a class, interface or trait exists with given name.
367		* @param string $class Full name of the class
368		* @return bool True if it exists, false if not
369		*/
370	57	private function isLoaded($class)
371		{
372	57	return class_exists($class, false) \|\|
373	54	interface_exists($class, false) \|\|
374	57	trait_exists($class, false);
375		}
376		}
377

Riimu / Kit-ClassLoader

ClassLoader::__construct() A last analyzed 2017-07-16 09:48 UTC

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ClassLoader::__construct() A
last analyzed 2017-07-16 09:48 UTC