Ubuntu
is_smartcrawl_analysis() ) {
return;
}
// Start an output buffer before any output starts.
add_action(
'template_redirect',
function () {
ob_start( array( $this, 'parse_page' ) );
},
1
);
}
/**
* Enable parser for selected module.
*
* @since 3.2.2
* @param string $module Module ID.
*/
public function enable( $module ) {
if ( ! in_array( $module, array( 'cdn', 'lazy_load', 'background_images' ), true ) ) {
return;
}
$this->$module = true;
}
/**
* Disable parser for selected module.
*
* @since 3.2.2
* @param string $module Module ID.
*/
public function disable( $module ) {
if ( ! in_array( $module, array( 'cdn', 'lazy_load' ), true ) ) {
return;
}
$this->$module = false;
}
/**
* Process images from current buffer content.
*
* Use DOMDocument class to find all available images in current HTML content and set attachment ID attribute.
*
* @since 3.0
* @since 3.2.2 Moved from \Smush\Core\Modules\CDN.
*
* @param string $content Current buffer content.
*
* @return string
*/
public function parse_page( $content ) {
// Do not parse page if CDN and Lazy load modules are disabled.
if ( ! $this->cdn && ! $this->lazy_load ) {
return $content;
}
/**
* Internal filter to disable page parsing.
*
* Because the page parser module is universal, we need to make sure that all modules have the ability to skip
* parsing of certain pages. For example, lazy loading should skip if_preview() pages. In order to achieve this
* functionality, I've introduced this filter. Filter priority can be used to overwrite the $skip param.
*
* @since 3.2.2
*
* @param bool $skip Skip status.
*/
if ( empty( $content ) || apply_filters( 'wp_smush_should_skip_parse', false ) ) {
return $content;
}
$content = $this->process_images( $content );
if ( $this->background_images ) {
$content = $this->process_background_images( $content );
}
return $content;
}
/**
* Process all images within ![]()
tags.
*
* @since 3.2.2
*
* @param string $content Current buffer content.
*
* @return string
*/
private function process_images( $content ) {
$images = self::get_images_from_content( $content );
if ( empty( $images ) ) {
return $content;
}
foreach ( $images[0] as $key => $image ) {
$img_src = $images['img_url'][ $key ];
$new_image = $image;
// Then update the image with correct CDN links.
if ( $this->cdn ) {
$new_image = WP_Smush::get_instance()->core()->mod->cdn->parse_image( $img_src, $new_image );
}
// First prepare for lazy-loading, as that does not require any URL rewrites.
if ( $this->lazy_load ) {
$new_image = WP_Smush::get_instance()->core()->mod->lazy->parse_image( $img_src, $new_image );
}
$content = str_replace( $image, $new_image, $content );
}
return $content;
}
/**
* Process all images that are contained as background-images.
*
* @since 3.2.2
*
* @param string $content Current buffer content.
*
* @return string
*/
private function process_background_images( $content ) {
$images = self::get_background_images( $content );
if ( empty( $images ) ) {
return $content;
}
foreach ( $images[0] as $key => $image ) {
$img_src = $images['img_url'][ $key ];
$new_image = $image;
// Update the image with correct CDN links.
$new_image = WP_Smush::get_instance()->core()->mod->cdn->parse_background_image( $img_src, $new_image );
$content = str_replace( $image, $new_image, $content );
}
return $content;
}
/**
* Compatibility with SmartCrawl readability analysis.
* Do not process page on analysis.
*
* @since 3.3.0
*/
private function is_smartcrawl_analysis() {
$wds_analysis = filter_input( INPUT_POST, 'action', FILTER_SANITIZE_STRING );
if ( ! is_null( $wds_analysis ) && 'wds-analysis-recheck' === $wds_analysis ) {
return true;
}
if ( isset( $_GET['wds-frontend-check'] ) ) {
return true;
}
return false;
}
/**
* Get image tags from page content.
*
* @since 3.1.0
* @since 3.2.0 Moved to WP_Smush_Content from \Smush\Core\Modules\CDN
* @since 3.2.2 Moved to Parser from WP_Smush_Content
*
* @param string $content Page content.
*
* @return array
*/
public static function get_images_from_content( $content ) {
$images = array();
if ( preg_match_all( '/(?:]*?\s+?src=["|\'](?P[^\s]+?)["|\'].*?>)/is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
}
return $images;
}
/**
* Get background images from content.
*
* @since 3.2.2
*
* @param string $content Page content.
*
* @return array
*/
private static function get_background_images( $content ) {
$images = array();
if ( preg_match_all( '/<[^>]*?\s*?background-image:\s*?url\([\'"]*?(?P[^\s\'"]+?)[\'")].*?>/is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
}
return $images;
}
/**
* Add attribute to selected tag.
*
* @since 3.1.0
* @since 3.2.0 Moved to WP_Smush_Content from \Smush\Core\Modules\CDN
* @since 3.2.2 Moved to Parser from WP_Smush_Content
*
* @param string $element Image element.
* @param string $name Img attribute name (srcset, size, etc).
* @param string $value Attribute value.
*/
public static function add_attribute( &$element, $name, $value ) {
$closing = false === strpos( $element, '/>' ) ? '>' : ' />';
$element = rtrim( $element, $closing ) . " {$name}=\"{$value}\"{$closing}";
}
/**
* Get attribute from an HTML element.
*
* @since 3.2.0
* @since 3.2.2 Moved to Parser from WP_Smush_Content
*
* @param string $element HTML element.
* @param string $name Attribute name.
*
* @return string
*/
public static function get_attribute( $element, $name ) {
preg_match( "/{$name}=['\"]([^'\"]+)\"/is", $element, $value );
return isset( $value['1'] ) ? $value['1'] : '';
}
/**
* Remove attribute from selected tag.
*
* @since 3.2.0
* @since 3.2.2 Moved to Parser from WP_Smush_Content
*
* @param string $element Image element.
* @param string $attribute Img attribute name (srcset, size, etc).
*/
public static function remove_attribute( &$element, $attribute ) {
$element = preg_replace( '/' . $attribute . '=[\'|"](.*?)[\'|"]/', '', $element );
}
/**
* Get URLs from a string of content.
*
* This is mostly used to get the URLs from srcset and parse each single URL to use in CDN.
*
* @since 3.3.0
*
* @param string $content Content.
*
* @return array
*/
public static function get_links_from_content( $content ) {
$images = array();
if ( preg_match_all( '/([http:|https:][^\s]*)/is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
}
return $images;
}
}