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<?php
namespace W3TC;
class LazyLoad_Plugin {
private $config;
private $modified = false;
private $excludes;
private $posts_by_url = array();
public function __construct() {
$this->config = Dispatcher::config();
}
public function run() {
Util_Bus::add_ob_callback( 'lazyload', array( $this, 'ob_callback' ) );
$this->metaslider_hooks();
add_filter( 'wp_get_attachment_url',
array( $this, 'wp_get_attachment_url' ), 10, 2 );
}
public function ob_callback( $buffer ) {
if ( $buffer == '' || !\W3TC\Util_Content::is_html_xml( $buffer ) ) {
return $buffer;
}
$can_process = array(
'enabled' => true,
'buffer' => $buffer,
'reason' => null
);
$can_process = $this->can_process( $can_process );
$can_process = apply_filters( 'w3tc_lazyload_can_process', $can_process );
if ( !$can_process['enabled'] ) {
return $buffer;
}
$this->excludes = apply_filters( 'w3tc_lazyload_excludes',
$this->config->get_array( 'lazyload.exclude' ) );
if ( $this->config->get_boolean( 'lazyload.process_img' ) ) {
$buffer = preg_replace_callback(
'~(<img[^>]+>)~',
array( $this, 'tag_with_src' ), $buffer
);
}
if ( $this->config->get_boolean( 'lazyload.process_background' ) ) {
$buffer = preg_replace_callback(
'~(<[^>]+background:\s*url[^>]+>)~',
array( $this, 'tag_with_background' ), $buffer
);
}
// embed lazyload script
if ( $this->modified ) {
$buffer = apply_filters( 'w3tc_lazyload_embed_script', $buffer );
$is_embed_script = apply_filters( 'w3tc_lazyload_is_embed_script', true );
if ( $is_embed_script ) {
$buffer = $this->embed_script( $buffer );
}
}
return $buffer;
}
private function can_process( $can_process ) {
if ( defined( 'WP_ADMIN' ) ) {
$can_process['enabled'] = false;
$can_process['reason'] = 'WP_ADMIN';
return $can_process;
}
if ( defined( 'SHORTINIT' ) && SHORTINIT ) {
$can_process['enabled'] = false;
$can_process['reason'] = 'SHORTINIT';
return $can_process;
}
return $can_process;
}
public function tag_with_src( $matches ) {
$content = $matches[0];
if ( $this->is_content_excluded( $content ) ) {
return $content;
}
// get image dimensions
$dim = $this->tag_get_dimensions( $content );
// do replace
$count = 0;
$content = preg_replace( '~(\s)src=~i',
'$1src="' . $this->placeholder( $dim['w'], $dim['h'] ) .
'" data-src=', $content, -1, $count );
if ( $count > 0 ) {
$content = preg_replace( '~(\s)(srcset|sizes)=~i',
'$1data-$2=', $content );
$content = $this->add_class_lazy( $content );
$this->modified = true;
}
return $content;
}
public function tag_get_dimensions( $content ) {
$dim = array( 'w' => 1, 'h' => 1 );
$m = null;
if ( preg_match( '~\swidth=[\s\'"]*([0-9]+)~i', $content, $m ) ) {
$dim['h'] = $dim['w'] = (int)$m[1];
if ( preg_match( '~\sheight=[\s\'"]*([0-9]+)~i', $content, $m ) ) {
$dim['h'] = (int)$m[1];
return $dim;
}
}
// if not in attributes - try to find via url
if ( !preg_match( '~\ssrc=(\'([^\']*)\'|"([^"]*)"|([^\'"][^\\s]*))~i',
$content, $m ) ) {
return $dim;
}
$url = ( !empty( $m[4] ) ? $m[4] : ( ( !empty( $m[3] ) ? $m[3] : $m2 ) ) );
// full url found
if ( isset( $this->posts_by_url[$url] ) ) {
$post_id = $this->posts_by_url[$url];
$image = wp_get_attachment_image_src( $post_id, 'full' );
if ( $image ) {
$dim['w'] = $image[1];
$dim['h'] = $image[2];
}
return $dim;
}
// try resized url by format
static $base_url = null;
if ( is_null( $base_url ) ) {
$base_url = wp_get_upload_dir()['baseurl'];
}
if ( substr( $url, 0, strlen( $base_url ) ) == $base_url &&
preg_match( '~(.+)-(\\d+)x(\\d+)(\\.[a-z0-9]+)$~i', $url, $m ) ) {
$dim['w'] = (int)$m[2];
$dim['h'] = (int)$m[3];
}
return $dim;
}
public function tag_with_background( $matches ) {
$content = $matches[0];
if ( $this->is_content_excluded( $content ) ) {
return $content;
}
$quote_match = null;
if ( !preg_match( '~\s+style\s*=\s*([\"\'])~', $content, $quote_match ) ) {
return $content;
}
$quote = $quote_match[1];
$count = 0;
$content = preg_replace_callback(
'~(\s+)(style\s*=\s*[' . $quote . '])(.*?)([' . $quote . '])~',
array( $this, 'style_offload_background' ), $content, -1, $count
);
if ( $count > 0 ) {
$content = $this->add_class_lazy( $content );
$this->modified = true;
}
return $content;
}
public function style_offload_background( $matches ) {
list( $match, $v1, $v2, $v, $quote ) = $matches;
$url_match = null;
preg_match( '~background:\s*(url\([^>]+\))~', $v, $url_match );
$v = preg_replace( '~background:\s*url\([^>]+\)[;]?\s*~', '', $v );
return $v1 . $v2 . $v . $quote . ' data-bg=' . $quote . $url_match[1] . $quote;
}
private function add_class_lazy( $content ) {
$count = 0;
$content = preg_replace_callback(
'~(\s+)(class=)([\"\'])(.*?)([\"\'])~',
array( $this, 'class_process' ), $content, -1, $count
);
if ( $count <= 0) {
$content = preg_replace(
'~<(\S+)(\s+)~', '<$1$2class="lazy" ', $content
);
}
return $content;
}
public function class_process( $matches ) {
list( $match, $v1, $v2, $quote, $v ) = $matches;
if ( preg_match( '~(^|\\s)lazy($|\\s)~', $v ) ) {
return $match;
}
$v .= ' lazy';
return $v1 . $v2 . $quote . $v . $quote;
}
private function is_content_excluded( $content ) {
foreach ( $this->excludes as $w ) {
if ( strpos( $content, $w ) !== FALSE ) {
return true;
}
}
return false;
}
private function placeholder( $w, $h ) {
return 'data:image/svg+xml,%3Csvg%20xmlns=\'http://www.w3.org/2000/svg\'%20viewBox=\'0%200%20' . $w . '%20'. $h . '\'%3E%3C/svg%3E';
}
private function embed_script( $buffer ) {
$js_url = plugins_url( 'pub/js/lazyload.min.js', W3TC_FILE );
$method = $this->config->get_string( 'lazyload.embed_method' );
$fireEvent = 'function(t){var e;try{e=new CustomEvent("w3tc_lazyload_loaded",{detail:{e:t}})}catch(a){(e=document.createEvent("CustomEvent")).initCustomEvent("w3tc_lazyload_loaded",!1,!1,{e:t})}window.dispatchEvent(e)}';
$config = '{elements_selector:".lazy",callback_loaded:' . $fireEvent . '}';
if ( $method == 'async_head' ) {
$embed_script =
'<script>window.w3tc_lazyload=1,window.lazyLoadOptions=' . $config . '</script>' .
'<style>img.lazy{min-height:1px}</style>' .
'<script async src="' . $js_url . '"></script>';
$buffer = preg_replace( '~<head(\s+[^>]*)*>~Ui',
'\\0' . $embed_script, $buffer, 1 );
// add protection to footer if async script executed too early
$footer_script =
'<script>' .
'document.addEventListener("DOMContentLoaded",function() {' .
'if (typeof LazyLoad !== "undefined") {' .
'window.w3tc_lazyload=new LazyLoad(window.lazyLoadOptions)' .
'}})</script>';
$buffer = preg_replace( '~</body(\s+[^>]*)*>~Ui',
$footer_script . '\\0', $buffer, 1 );
} elseif ( $method == 'inline_footer' ) {
$footer_script =
'<style>img.lazy{min-height:1px}</style>' .
'<script>' .
file_get_contents( W3TC_DIR . '/pub/js/lazyload.min.js' ) .
'window.w3tc_lazyload=new LazyLoad(' . $config . ')</script>';
$buffer = preg_replace( '~</body(\s+[^>]*)*>~Ui',
$footer_script . '\\0', $buffer, 1 );
} else { // 'sync_head'
$head_script =
'<style>img.lazy{min-height:1px}</style>' .
'<script src="' . $js_url . '"></script>';
$buffer = preg_replace( '~<head(\s+[^>]*)*>~Ui',
'\\0' . $head_script, $buffer, 1 );
$footer_script =
'<script>window.w3tc_lazyload=new LazyLoad(' . $config . ')</script>';
$buffer = preg_replace( '~</body(\s+[^>]*)*>~Ui',
$footer_script . '\\0', $buffer, 1 );
}
return $buffer;
}
public function wp_get_attachment_url( $url, $post_id ) {
$this->posts_by_url[$url] = $post_id;
return $url;
}
private function metaslider_hooks() {
add_filter( 'metaslider_nivo_slider_get_html',
array( $this, 'metaslider_nivo_slider_get_html' ) );
}
public function metaslider_nivo_slider_get_html( $content ) {
// nivo slider use "src" attr of <img> tags to populate
// own image via JS, i.e. cant be replaced by lazyloading
$content = preg_replace(
'~(\s+)(class=)([\"\'])(.*?)([\"\'])~',
'$1$2$3$4 no-lazy$5', $content
);
return $content;
}
}