depicter / modules / GuzzleHttp / Psr7 / FnStream.php

FnStream.php in Depicter — Popup & Slider Builder trunk, at modules/GuzzleHttp/Psr7/FnStream.php

181 lines 4.2 KB

Raw Download Zip

1	<?php
2
3	declare(strict_types=1);
4
5	namespace Depicter\GuzzleHttp\Psr7;
6
7	use Depicter\Psr\Http\Message\StreamInterface;
8
9	/**
10	* Compose stream implementations based on a hash of functions.
11	*
12	* Allows for easy testing and extension of a provided stream without needing
13	* to create a concrete class for a simple extension point.
14	*/
15	#[\AllowDynamicProperties]
16	final class FnStream implements StreamInterface
17	{
18	private const SLOTS = [
19	'__toString', 'close', 'detach', 'rewind',
20	'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
21	'isReadable', 'read', 'getContents', 'getMetadata',
22	];
23
24	/** @var array<string, callable> */
25	private $methods;
26
27	/**
28	* @param array<string, callable> $methods Hash of method name to a callable.
29	*/
30	public function __construct(array $methods)
31	{
32	$this->methods = $methods;
33
34	// Create the functions on the class
35	foreach ($methods as $name => $fn) {
36	$this->{'_fn_'.$name} = $fn;
37	}
38	}
39
40	/**
41	* Lazily determine which methods are not implemented.
42	*
43	* @throws \BadMethodCallException
44	*/
45	public function __get(string $name): void
46	{
47	throw new \BadMethodCallException(str_replace('_fn_', '', $name)
48	.'() is not implemented in the FnStream');
49	}
50
51	/**
52	* The close method is called on the underlying stream only if possible.
53	*/
54	public function __destruct()
55	{
56	if (isset($this->_fn_close)) {
57	($this->_fn_close)();
58	}
59	}
60
61	/**
62	* An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
63	*
64	* @throws \LogicException
65	*/
66	public function __wakeup(): void
67	{
68	throw new \LogicException('FnStream should never be unserialized');
69	}
70
71	/**
72	* Adds custom functionality to an underlying stream by intercepting
73	* specific method calls.
74	*
75	* @param StreamInterface $stream Stream to decorate
76	* @param array<string, callable> $methods Hash of method name to a closure
77	*
78	* @return FnStream
79	*/
80	public static function decorate(StreamInterface $stream, array $methods)
81	{
82	// If any of the required methods were not provided, then simply
83	// proxy to the decorated stream.
84	foreach (array_diff(self::SLOTS, array_keys($methods)) as $diff) {
85	/** @var callable $callable */
86	$callable = [$stream, $diff];
87	$methods[$diff] = $callable;
88	}
89
90	return new self($methods);
91	}
92
93	public function __toString(): string
94	{
95	try {
96	/** @var string */
97	return ($this->_fn___toString)();
98	} catch (\Throwable $e) {
99	if (\PHP_VERSION_ID >= 70400) {
100	throw $e;
101	}
102	trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);
103
104	return '';
105	}
106	}
107
108	public function close(): void
109	{
110	($this->_fn_close)();
111	}
112
113	public function detach()
114	{
115	return ($this->_fn_detach)();
116	}
117
118	public function getSize(): ?int
119	{
120	return ($this->_fn_getSize)();
121	}
122
123	public function tell(): int
124	{
125	return ($this->_fn_tell)();
126	}
127
128	public function eof(): bool
129	{
130	return ($this->_fn_eof)();
131	}
132
133	public function isSeekable(): bool
134	{
135	return ($this->_fn_isSeekable)();
136	}
137
138	public function rewind(): void
139	{
140	($this->_fn_rewind)();
141	}
142
143	public function seek($offset, $whence = SEEK_SET): void
144	{
145	($this->_fn_seek)($offset, $whence);
146	}
147
148	public function isWritable(): bool
149	{
150	return ($this->_fn_isWritable)();
151	}
152
153	public function write($string): int
154	{
155	return ($this->_fn_write)($string);
156	}
157
158	public function isReadable(): bool
159	{
160	return ($this->_fn_isReadable)();
161	}
162
163	public function read($length): string
164	{
165	return ($this->_fn_read)($length);
166	}
167
168	public function getContents(): string
169	{
170	return ($this->_fn_getContents)();
171	}
172
173	/**
174	* @return mixed
175	*/
176	public function getMetadata($key = null)
177	{
178	return ($this->_fn_getMetadata)($key);
179	}
180	}
181