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<?php |
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namespace OptimoleWP\Preload; |
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|
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/** |
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* Class Links |
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* |
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* @package OptimoleWP\Preload |
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*/ |
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class Links { |
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/** |
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* The maximum number of links to preload. |
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* |
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* @var int $MAX_LINKS The maximum number of links to preload. |
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*/ |
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const MAX_LINKS = 10; |
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/** |
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* Links map that contains the url as the key and the url data as the value. |
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* |
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* @var array $links The array of links to preload. |
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*/ |
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private static $links = []; |
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/** |
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* Ids map of the images that are preloaded. |
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* |
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* @var array $ids The array of ids to preload. |
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*/ |
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private static $ids = []; |
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/** |
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* Add a link to the preload array. |
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* |
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* @param array $url_data The array of url data to add. |
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*/ |
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public static function add_link( array $url_data ) { |
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if ( ! isset( $url_data['url'] ) ) { |
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return; |
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} |
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if ( OPTML_DEBUG ) { |
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do_action( 'optml_log', 'add preload link : ' . print_r( $url_data, true ) ); |
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} |
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self::$links[ crc32( $url_data['url'] ) ] = $url_data; |
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} |
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|
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/** |
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* Add an id to the preload array. |
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* |
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* @param int $id The id to add. |
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* @param string $priority The priority of the id. |
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*/ |
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public static function add_id( int $id, string $priority = 'auto' ) { |
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if ( OPTML_DEBUG ) { |
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do_action( 'optml_log', 'add preload id : ' . $id . ' ' . $priority ); |
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} |
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self::$ids[ $id ] = $priority; |
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} |
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|
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/** |
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* Check if an id is preloaded. |
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* |
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* @param int $id The id to check. |
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* @return string|false The priority of the id or false if it is not preloaded. |
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*/ |
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public static function is_preloaded( int $id ) { |
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return self::$ids[ $id ] ?? false; |
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} |
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|
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/** |
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* Preload a tag. |
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* |
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* @param string $tag The tag to preload. |
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* @param string $priority The priority of the tag. |
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*/ |
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public static function preload_tag( string $tag, string $priority = '' ) { |
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// Extract src, srcset, and sizes from the tag using regexes for each one |
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$src = ''; |
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$srcset = ''; |
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$sizes = ''; |
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|
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$src_pattern = '/<img[^>]+src=["|\']([^"|\']+)["|\']/i'; |
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$srcset_pattern = '/<img[^>]+srcset=["|\']([^"|\']+)["|\']/i'; |
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$sizes_pattern = '/<img[^>]+sizes=["|\']([^"|\']+)["|\']/i'; |
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|
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if ( preg_match( $src_pattern, $tag, $matches ) ) { |
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$src = $matches[1]; |
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} |
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if ( preg_match( $srcset_pattern, $tag, $matches ) ) { |
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$srcset = $matches[1]; |
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} |
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if ( preg_match( $sizes_pattern, $tag, $matches ) ) { |
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$sizes = $matches[1]; |
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} |
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if ( OPTML_DEBUG ) { |
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do_action( |
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'optml_log', |
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'preload_tag: ' . print_r( |
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[ |
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'url' => $src, |
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'srcset' => $srcset, |
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'sizes' => $sizes, |
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'priority' => $priority, |
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], |
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true |
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) . ' ' . $priority |
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); |
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} |
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// Add the preload link to the links array |
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self::add_link( |
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[ |
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'url' => $src, |
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'srcset' => $srcset, |
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'sizes' => $sizes, |
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'priority' => $priority, |
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] |
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); |
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} |
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|
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/** |
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* Get the links. |
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* |
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* @return array The links. |
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*/ |
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public static function get_links(): array { |
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return self::$links; |
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} |
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|
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/** |
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* Get the links count. |
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* |
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* @return int The links count. |
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*/ |
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public static function get_links_count(): int { |
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return count( self::$links ); |
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} |
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|
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/** |
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* Get the links html. |
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* |
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* @return string The links html. |
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*/ |
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public static function get_links_html(): string { |
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// generate image preload links for all links |
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$links = []; |
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foreach ( self::$links as $link ) { |
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$url = esc_url( $link['url'] ); |
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if ( empty( $url ) ) { |
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continue; |
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} |
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$preload = '<link rel="preload" media="screen" href="' . $url . '" '; |
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if ( isset( $link['priority'] ) && $link['priority'] !== 'auto' ) { |
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$preload .= 'fetchpriority="' . esc_attr( $link['priority'] ) . '" '; |
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} |
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// Add imagesrcset if available |
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if ( isset( $link['srcset'] ) && ! empty( $link['srcset'] ) ) { |
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$preload .= 'imagesrcset="' . esc_attr( $link['srcset'] ) . '" '; |
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} |
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// Add imagesizes if available |
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if ( isset( $link['sizes'] ) && ! empty( $link['sizes'] ) ) { |
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$preload .= 'imagesizes="' . esc_attr( $link['sizes'] ) . '" '; |
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} |
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// Complete the preload tag |
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$preload .= 'as="image">'; |
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if ( count( $links ) >= self::MAX_LINKS ) { |
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break; |
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} |
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$links[] = $preload; |
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} |
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return implode( "\n", $links ) . "\n"; |
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} |
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} |
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|
