give / src / DonationForms / Actions / IsolateEnqueuedFormViewAssets.php

IsolateEnqueuedFormViewAssets.php in GiveWP – Donation Plugin and Fundraising Platform 4.16.9, at src/DonationForms/Actions/IsolateEnqueuedFormViewAssets.php

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1	<?php
2
3	namespace Give\DonationForms\Actions;
4
5	use WP_Dependencies;
6
7	/**
8	* Pins the script and style queues to what has already been enqueued, so a form view route prints
9	* its own assets and nothing else.
10	*
11	* The form view routes render a standalone document by calling wp_print_styles(),
12	* wp_print_head_scripts() and wp_print_footer_scripts() directly. Each of those fires an action that
13	* plugins legitimately enqueue from, so the queues keep growing after the route has finished
14	* enqueuing. Constraining the handles at print time, instead of dequeuing on a hook, keeps the route
15	* independent of the priority the other plugin picked.
16	*
17	* @since 4.16.7
18	*/
19	class IsolateEnqueuedFormViewAssets
20	{
21	/**
22	* @since 4.16.7
23	*/
24	public function __invoke(): void
25	{
26	$this->pinQueue(wp_scripts(), 'print_scripts_array', 'scripts');
27	$this->pinQueue(wp_styles(), 'print_styles_array', 'styles');
28	}
29
30	/**
31	* @since 4.16.7
32	*
33	* @param WP_Dependencies $dependencies The queue to pin.
34	* @param string $filter Print-time filter the queue is constrained through.
35	* @param string $type Either "scripts" or "styles".
36	*/
37	private function pinQueue(WP_Dependencies $dependencies, string $filter, string $type): void
38	{
39	$allowedHandles = $this->expandDependencies($dependencies, $dependencies->queue);
40
41	/**
42	* Filters the handles a donation form view route may print. Add a handle here to let an
43	* asset enqueued after the form has been prepared through to the rendered form.
44	*
45	* @since 4.16.7
46	*
47	* @param string[] $allowedHandles Handles the route will print.
48	* @param string $type Either "scripts" or "styles".
49	*/
50	$allowedHandles = apply_filters(
51	'givewp_donation_form_view_allowed_asset_handles',
52	$allowedHandles,
53	$type
54	);
55
56	add_filter($filter, static function ($handles) use ($allowedHandles) {
57	return array_values(array_intersect($handles, $allowedHandles));
58	});
59	}
60
61	/**
62	* Resolves the given handles together with everything they depend on. Registered dependencies
63	* may be cyclic, so handles are only ever visited once.
64	*
65	* @since 4.16.7
66	*
67	* @param WP_Dependencies $dependencies Queue the handles are registered in.
68	* @param string[] $handles Handles to resolve.
69	*
70	* @return string[]
71	*/
72	private function expandDependencies(WP_Dependencies $dependencies, array $handles): array
73	{
74	$resolved = [];
75
76	while ($handles) {
77	/* WordPress allows arguments to be appended to a queued handle. */
78	$handle = explode('?', (string)array_shift($handles))[0];
79
80	if (isset($resolved[$handle])) {
81	continue;
82	}
83
84	$resolved[$handle] = true;
85
86	if (isset($dependencies->registered[$handle])) {
87	$handles = array_merge($handles, $dependencies->registered[$handle]->deps);
88	}
89	}
90
91	return array_keys($resolved);
92	}
93	}
94