desktop-mode / includes / framework / app / class-state.php

class-state.php in OpenStation: Desktop Windows, Dock & Virtual Desktops for WP Admin 1.1.8, at includes/framework/app/class-state.php

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1	<?php
2	/**
3	* OpenStation App Framework — window state.
4	*
5	* The one bag of values a window's view is a function of. The app
6	* declares its shape with `App::state( $defaults )`; the client
7	* echoes the bag back with every dispatch; the server rebuilds it
8	* here, **admitting only declared keys and only values of the
9	* declared type**. A client can therefore never smuggle in a key the
10	* app did not ask for, and an action can rely on `$state->get(
11	* 'range' )` being the string it was declared as.
12	*
13	* Everything else — parsed entries, query results, computed rows —
14	* is not state. It is derived inside the view on every render, which
15	* keeps the wire small and the server stateless.
16	*
17	* @package OpenStation
18	*/
19
20	namespace OpenStation\App;
21
22	// Direct access, unless a standalone host is booting on bare PHP.
23	if ( ! defined( 'ABSPATH' ) ) {
24	defined( 'OPENSTATION_STANDALONE' ) \|\| exit;
25	}
26
27	/**
28	* Typed, schema-bound window state.
29	*/
30	final class State implements \ArrayAccess, \JsonSerializable {
31
32	/**
33	* Declared defaults — the schema.
34	*
35	* @var array<string,mixed>
36	*/
37	private $defaults;
38
39	/**
40	* Current values, always a superset of the defaults' keys.
41	*
42	* @var array<string,mixed>
43	*/
44	private $values;
45
46	/**
47	* @param array<string,mixed> $defaults Declared defaults.
48	* @param array<string,mixed> $incoming Values sent by the client; filtered against the defaults.
49	*/
50	public function __construct( array $defaults, array $incoming = array() ) {
51	$this->defaults = $defaults;
52	$this->values = $defaults;
53	foreach ( $defaults as $key => $default ) {
54	if ( array_key_exists( $key, $incoming ) ) {
55	$this->values[ $key ] = self::accept( $default, $incoming[ $key ] );
56	}
57	}
58	}
59
60	/**
61	* Coerce an incoming value onto the declared default's type, or
62	* fall back to the default when the shapes disagree.
63	*
64	* @param mixed $default Declared default.
65	* @param mixed $value Incoming value.
66	* @return mixed
67	*/
68	private static function accept( $default, $value ) {
69	if ( is_bool( $default ) ) {
70	if ( is_bool( $value ) ) {
71	return $value;
72	}
73	if ( is_string( $value ) \|\| is_int( $value ) ) {
74	return in_array( $value, array( '1', 1, 'true', 'on' ), true );
75	}
76	return $default;
77	}
78	if ( is_int( $default ) ) {
79	return is_numeric( $value ) ? (int) $value : $default;
80	}
81	if ( is_float( $default ) ) {
82	return is_numeric( $value ) ? (float) $value : $default;
83	}
84	if ( is_string( $default ) ) {
85	return is_scalar( $value ) ? (string) $value : $default;
86	}
87	if ( is_array( $default ) ) {
88	return is_array( $value ) ? $value : $default;
89	}
90	// A `null` default declares an untyped slot: any JSON value.
91	return is_scalar( $value ) \|\| is_array( $value ) \|\| null === $value ? $value : $default;
92	}
93
94	/**
95	* Read a key.
96	*
97	* @param string $key State key.
98	* @param mixed $fallback Returned for an undeclared key.
99	* @return mixed
100	*/
101	public function get( $key, $fallback = null ) {
102	return array_key_exists( $key, $this->values ) ? $this->values[ $key ] : $fallback;
103	}
104
105	/**
106	* Write a key. Undeclared keys are ignored — declare them in
107	* `App::state()` first.
108	*
109	* @param string $key State key.
110	* @param mixed $value New value.
111	* @return self
112	*/
113	public function set( $key, $value ) {
114	if ( array_key_exists( $key, $this->defaults ) ) {
115	$this->values[ $key ] = self::accept( $this->defaults[ $key ], $value );
116	}
117	return $this;
118	}
119
120	/**
121	* Whether a key is declared.
122	*
123	* @param string $key State key.
124	* @return bool
125	*/
126	public function has( $key ) {
127	return array_key_exists( $key, $this->defaults );
128	}
129
130	/**
131	* Flip a boolean key.
132	*
133	* @param string $key State key.
134	* @return self
135	*/
136	public function toggle( $key ) {
137	return $this->set( $key, ! $this->get( $key ) );
138	}
139
140	/**
141	* Add an item to a list key when absent, remove it when present.
142	* The shape every "expanded rows" / "hidden series" set needs.
143	*
144	* @param string $key State key holding a list.
145	* @param mixed $item Scalar item.
146	* @return self
147	*/
148	public function toggle_item( $key, $item ) {
149	$list = $this->get( $key );
150	if ( ! is_array( $list ) ) {
151	return $this;
152	}
153	$index = array_search( $item, $list, true );
154	if ( false === $index ) {
155	$list[] = $item;
156	} else {
157	unset( $list[ $index ] );
158	}
159	return $this->set( $key, array_values( $list ) );
160	}
161
162	/**
163	* Whether a list key contains an item.
164	*
165	* @param string $key State key holding a list.
166	* @param mixed $item Scalar item.
167	* @return bool
168	*/
169	public function contains( $key, $item ) {
170	$list = $this->get( $key );
171	return is_array( $list ) && in_array( $item, $list, true );
172	}
173
174	/**
175	* Put a key back to its declared default.
176	*
177	* @param string $key State key.
178	* @return self
179	*/
180	public function reset( $key ) {
181	if ( array_key_exists( $key, $this->defaults ) ) {
182	$this->values[ $key ] = $this->defaults[ $key ];
183	}
184	return $this;
185	}
186
187	/**
188	* Every value, declared order.
189	*
190	* @return array<string,mixed>
191	*/
192	public function all() {
193	return $this->values;
194	}
195
196	/**
197	* The declared defaults.
198	*
199	* @return array<string,mixed>
200	*/
201	public function defaults() {
202	return $this->defaults;
203	}
204
205	/** {@inheritDoc} */
206	#[\ReturnTypeWillChange]
207	public function jsonSerialize() {
208	return $this->values;
209	}
210
211	/** {@inheritDoc} */
212	#[\ReturnTypeWillChange]
213	public function offsetExists( $offset ) {
214	return $this->has( $offset );
215	}
216
217	/** {@inheritDoc} */
218	#[\ReturnTypeWillChange]
219	public function offsetGet( $offset ) {
220	return $this->get( $offset );
221	}
222
223	/** {@inheritDoc} */
224	#[\ReturnTypeWillChange]
225	public function offsetSet( $offset, $value ) {
226	$this->set( $offset, $value );
227	}
228
229	/** {@inheritDoc} */
230	#[\ReturnTypeWillChange]
231	public function offsetUnset( $offset ) {
232	$this->reset( $offset );
233	}
234	}
235