= 6.8 drives WordPress Core's Speculation Rules API via the
* `wp_speculation_rules_configuration` and `wp_speculation_rules_href_exclude_paths`
* filters. The viewport toggle additionally renders an IntersectionObserver that
* appends per-URL `
is_amp_or_customizer() ) {
return;
}
$mode = Settings_Store::get_instance()->get( Constants::SETTING_PREFETCH_URLS_MODE );
if ( self::PREFETCH_MODE_HOVER === $mode ) {
wp_enqueue_script( 'swcfpc_instantpage', SWCFPC_PLUGIN_URL . 'assets/js/instantpage.min.js', [], SWCFPC_VERSION, true );
return;
}
if ( self::PREFETCH_MODE_VIEWPORT === $mode ) {
$this->enqueue_legacy_viewport_helpers();
}
}
/**
* Emit the inline JS that defines the wildcard-aware exclusion check used by the
* viewport prefetch script.
*
* @return void
*/
private function enqueue_legacy_viewport_helpers() {
$prefetch_urls_to_exclude = Sanitization::sanitize_prefetch_excluded_urls_array(
Settings_Store::get_instance()->get( Constants::SETTING_EXCLUDED_URLS, [] )
);
wp_register_script( 'swcfpc_auto_prefetch_url', '', [], '', true );
wp_enqueue_script( 'swcfpc_auto_prefetch_url' );
ob_start();
?>
function swcfpc_wildcard_check(str, rule) {
let escapeRegex = (str) => str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
return new RegExp("^" + rule.split("*").map(escapeRegex).join(".*") + "$").test(str);
}
function swcfpc_can_url_be_prefetched(href) {
if( href.length == 0 )
return false;
if( href.startsWith("mailto:") )
return false;
if( href.startsWith("https://") )
href = href.split("https://"+location.host)[1];
else if( href.startsWith("http://") )
href = href.split("http://"+location.host)[1];
for( let i=0; i < swcfpc_prefetch_urls_to_exclude.length; i++) {
if( swcfpc_wildcard_check(href, swcfpc_prefetch_urls_to_exclude[i]) )
return false;
}
return true;
}
let swcfpc_prefetch_urls_to_exclude = ;
is_cache_enabled() || is_user_logged_in() ) {
return;
}
if ( self::PREFETCH_MODE_VIEWPORT !== $settings->get( Constants::SETTING_PREFETCH_URLS_MODE ) ) {
return;
}
$timestamp = $settings->get( Constants::SETTING_PREFETCH_URLS_TIMESTAMP, time() );
?>
get( Constants::SETTING_PREFETCH_URLS_TIMESTAMP, time() );
if ( $current_timestamp < time() ) {
$current_timestamp = time() + 120;
$settings->set( Constants::SETTING_PREFETCH_URLS_TIMESTAMP, $current_timestamp )->save();
Logger::log( 'speculative_loading::bump_prefetch_timestamp', "New timestamp generated: {$current_timestamp}", true );
}
return $current_timestamp;
}
/**
* Tag the instant.page script as a module per upstream guidance.
*
* @param string $tag The script tag.
* @param string $handle The script handle.
* @return string
*/
public function set_instantpage_module_attribute( $tag, $handle ) {
if ( empty( $tag ) || $handle !== 'swcfpc_instantpage' ) {
return $tag;
}
if ( strpos( $tag, 'text/javascript' ) !== false ) {
$tag = str_replace( 'text/javascript', 'module', $tag );
} else {
$tag = str_replace( ' src', ' type="module" src', $tag );
}
return $tag;
}
/**
* @return bool
*/
private function is_amp_or_customizer() {
return (
( function_exists( 'amp_is_request' ) && amp_is_request() ) ||
( function_exists( 'ampforwp_is_amp_endpoint' ) && ampforwp_is_amp_endpoint() ) ||
is_customize_preview()
);
}
/**
* @return bool
*/
public static function is_legacy_engine() {
return ! self::is_available() && self::PREFETCH_MODE_VIEWPORT === Settings_Store::get_instance()->get( Constants::SETTING_PREFETCH_URLS_MODE );
}
}