speculation-rules / hooks.php

hooks.php in Speculative Loading 1.2.2, at hooks.php

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1	<?php
2	/**
3	* Hook callbacks used for Speculative Loading.
4	*
5	* @package speculation-rules
6	* @since 1.0.0
7	*/
8
9	// Exit if accessed directly.
10	if ( ! defined( 'ABSPATH' ) ) {
11	exit;
12	}
13
14	/**
15	* Prints the speculation rules.
16	*
17	* For browsers that do not support speculation rules yet, the `script[type="speculationrules"]` tag will be ignored.
18	*
19	* @since 1.0.0
20	*/
21	function plsr_print_speculation_rules() {
22	$rules = plsr_get_speculation_rules();
23	if ( empty( $rules ) ) {
24	return;
25	}
26
27	// This workaround is needed for WP 6.4. See <https://core.trac.wordpress.org/ticket/60320>.
28	$needs_html5_workaround = (
29	! current_theme_supports( 'html5', 'script' ) &&
30	version_compare( strtok( get_bloginfo( 'version' ), '-' ), '6.4', '>=' ) &&
31	version_compare( strtok( get_bloginfo( 'version' ), '-' ), '6.5', '<' )
32	);
33	if ( $needs_html5_workaround ) {
34	$backup_wp_theme_features = $GLOBALS['_wp_theme_features'];
35	add_theme_support( 'html5', array( 'script' ) );
36	}
37
38	wp_print_inline_script_tag(
39	wp_json_encode( $rules ),
40	array( 'type' => 'speculationrules' )
41	);
42
43	if ( $needs_html5_workaround ) {
44	$GLOBALS['_wp_theme_features'] = $backup_wp_theme_features; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
45	}
46	}
47	add_action( 'wp_footer', 'plsr_print_speculation_rules' );
48
49	/**
50	* Displays the HTML generator meta tag for the Speculative Loading plugin.
51	*
52	* See {@see 'wp_head'}.
53	*
54	* @since 1.1.0
55	*/
56	function plsr_render_generator_meta_tag() {
57	// Use the plugin slug as it is immutable.
58	echo '<meta name="generator" content="speculation-rules ' . esc_attr( SPECULATION_RULES_VERSION ) . '">' . "\n";
59	}
60	add_action( 'wp_head', 'plsr_render_generator_meta_tag' );
61